Support in-place upgrades of new minio binary and releases. (#4961)

This PR allows 'minio update' to not only shows update banner
but also allows for in-place upgrades.

Updates are done safely by validating the downloaded
sha256 of the binary.

Fixes #4781

Dockerfile

@@ -5,6 +5,7 @@ MAINTAINER Minio Inc <dev@minio.io>
 ENV GOPATH /go
 ENV PATH $PATH:$GOPATH/bin
 ENV CGO_ENABLED 0
+ENV MINIO_UPDATE off
 
 WORKDIR /go/src/github.com/minio/
 

Dockerfile.dev

@@ -5,6 +5,7 @@ MAINTAINER Minio Inc <dev@minio.io>
 ENV GOPATH /go
 ENV PATH $PATH:$GOPATH/bin
 ENV CGO_ENABLED 0
+ENV MINIO_UPDATE off
 
 WORKDIR /go/src/github.com/minio/
 

Dockerfile.release

@@ -4,6 +4,8 @@ MAINTAINER Minio Inc <dev@minio.io>
  
 COPY dockerscripts/docker-entrypoint.sh dockerscripts/healthcheck.sh /usr/bin/
 
+ENV MINIO_UPDATE off
+
 RUN \
      apk add --no-cache ca-certificates && \
      apk add --no-cache --virtual .build-deps curl && \

cmd/common-main.go

@@ -29,10 +29,12 @@ import (
 
 // Check for updates and print a notification message
 func checkUpdate(mode string) {
-	// Its OK to ignore any errors during getUpdateInfo() here.
+	// Its OK to ignore any errors during doUpdate() here.
-	if older, downloadURL, err := getUpdateInfo(1*time.Second, mode); err == nil {
+	if updateMsg, _, currentReleaseTime, latestReleaseTime, err := getUpdateInfo(2*time.Second, mode); err == nil {
-		if updateMsg := computeUpdateMessage(downloadURL, older); updateMsg != "" {
+		if globalInplaceUpdateDisabled {
 			log.Println(updateMsg)
+		} else {
+			log.Println(prepareUpdateMessage("Run `minio update`", latestReleaseTime.Sub(currentReleaseTime)))
 		}
 	}
 }
@@ -106,4 +108,9 @@ func handleCommonEnvVars() {
 	if globalDomainName != "" {
 		globalIsEnvDomainName = true
 	}
+
+	// In place update is true by default if the MINIO_UPDATE is not set
+	// or is not set to 'off', if MINIO_UPDATE is set to 'off' then
+	// in-place update is off.
+	globalInplaceUpdateDisabled = strings.EqualFold(os.Getenv("MINIO_UPDATE"), "off")
 }

cmd/gateway/azure/gateway-azure.go

@@ -71,6 +71,9 @@ ENVIRONMENT VARIABLES:
   BROWSER:
      MINIO_BROWSER: To disable web browser access, set this value to "off".
 
+  UPDATE:
+     MINIO_UPDATE: To turn off in-place upgrades, set this value to "off".
+
 EXAMPLES:
   1. Start minio gateway server for Azure Blob Storage backend.
       $ export MINIO_ACCESS_KEY=azureaccountname

cmd/gateway/b2/gateway-b2.go

@@ -23,6 +23,7 @@ import (
 	"hash"
 	"io"
 	"io/ioutil"
+
 	"net/http"
 	"strings"
 	"sync"
@@ -63,6 +64,9 @@ ENVIRONMENT VARIABLES:
   BROWSER:
      MINIO_BROWSER: To disable web browser access, set this value to "off".
 
+  UPDATE:
+     MINIO_UPDATE: To turn off in-place upgrades, set this value to "off".
+
 EXAMPLES:
   1. Start minio gateway server for B2 backend.
       $ export MINIO_ACCESS_KEY=accountID

cmd/gateway/gcs/gateway-gcs.go

@@ -23,6 +23,7 @@ import (
 	"fmt"
 	"io"
 	"io/ioutil"
+
 	"math"
 	"os"
 	"regexp"
@@ -109,6 +110,9 @@ ENVIRONMENT VARIABLES:
   BROWSER:
      MINIO_BROWSER: To disable web browser access, set this value to "off".
 
+  UPDATE:
+     MINIO_UPDATE: To turn off in-place upgrades, set this value to "off".
+
   GCS credentials file:
      GOOGLE_APPLICATION_CREDENTIALS: Path to credentials.json
 

cmd/gateway/s3/gateway-s3.go

@@ -55,6 +55,9 @@ ENVIRONMENT VARIABLES:
   BROWSER:
      MINIO_BROWSER: To disable web browser access, set this value to "off".
 
+  UPDATE:
+     MINIO_UPDATE: To turn off in-place upgrades, set this value to "off".
+
 EXAMPLES:
   1. Start minio gateway server for AWS S3 backend.
       $ export MINIO_ACCESS_KEY=accesskey

cmd/gateway/sia/gateway-sia.go

@@ -69,6 +69,12 @@ ENVIRONMENT VARIABLES: (Default values in parenthesis)
      MINIO_ACCESS_KEY: Custom access key (Do not reuse same access keys on all instances)
      MINIO_SECRET_KEY: Custom secret key (Do not reuse same secret keys on all instances)
 
+  BROWSER:
+     MINIO_BROWSER: To disable web browser access, set this value to "off".
+
+  UPDATE:
+     MINIO_UPDATE: To turn off in-place upgrades, set this value to "off".
+
   SIA_TEMP_DIR:        The name of the local Sia temporary storage directory. (.sia_temp)
   SIA_API_PASSWORD:    API password for Sia daemon. (default is empty)
 

cmd/globals.go

@@ -89,9 +89,12 @@ var (
 	// Set to true if credentials were passed from env, default is false.
 	globalIsEnvCreds = false
 
-	// This flag is set to 'true' wen MINIO_REGION env is set.
+	// This flag is set to 'true' when MINIO_REGION env is set.
 	globalIsEnvRegion = false
 
+	// This flag is set to 'true' when MINIO_UPDATE env is set to 'off'. Default is false.
+	globalInplaceUpdateDisabled = false
+
 	// This flag is set to 'us-east-1' by default
 	globalServerRegion = globalMinioDefaultRegion
 

cmd/server-main.go

@@ -62,6 +62,9 @@ ENVIRONMENT VARIABLES:
   REGION:
      MINIO_REGION: To set custom region. By default it is "us-east-1".
 
+  UPDATE:
+     MINIO_UPDATE: To turn off in-place upgrades, set this value to "off".
+
 EXAMPLES:
   1. Start minio server on "/home/shared" directory.
       $ {{.HelpName}} /home/shared

cmd/update-main.go

@@ -18,6 +18,9 @@ package cmd
 
 import (
 	"bufio"
+	"crypto"
+	_ "crypto/sha256" // Needed for sha256 hash verifier.
+	"encoding/hex"
 	"fmt"
 	"io/ioutil"
 	"net/http"
@@ -28,7 +31,9 @@ import (
 	"time"
 
 	"github.com/fatih/color"
+	"github.com/inconshreveable/go-update"
 	"github.com/minio/cli"
+	"github.com/segmentio/go-prompt"
 )
 
 // Check for new software updates.
@@ -53,18 +58,19 @@ FLAGS:
   {{end}}{{end}}
 EXIT STATUS:
    0 - You are already running the most recent version.
-   1 - New update is available.
+   1 - New update was applied successfully.
   -1 - Error in getting update information.
 
 EXAMPLES:
-   1. Check if there is a new update available:
+   1. Check and update minio:
-       $ {{.HelpName}}
+       $ {{.HelpName}
 `,
 }
 
 const (
 	minioReleaseTagTimeLayout = "2006-01-02T15-04-05Z"
-	minioReleaseURL           = "https://dl.minio.io/server/minio/release/" + runtime.GOOS + "-" + runtime.GOARCH + "/"
+	minioOSARCH               = runtime.GOOS + "-" + runtime.GOARCH
+	minioReleaseURL           = "https://dl.minio.io/server/minio/release/" + minioOSARCH + "/"
 )
 
 var (
@@ -335,23 +341,24 @@ func DownloadReleaseData(timeout time.Duration, mode string) (data string, err e
 // fbe246edbd382902db9a4035df7dce8cb441357d minio.RELEASE.2016-10-07T01-16-39Z
 //
 // The second word must be `minio.` appended to a standard release tag.
-func parseReleaseData(data string) (releaseTime time.Time, err error) {
+func parseReleaseData(data string) (sha256Hex string, releaseTime time.Time, err error) {
 	fields := strings.Fields(data)
 	if len(fields) != 2 {
 		err = fmt.Errorf("Unknown release data `%s`", data)
-		return releaseTime, err
+		return sha256Hex, releaseTime, err
 	}
 
+	sha256Hex = fields[0]
 	releaseInfo := fields[1]
 
 	fields = strings.SplitN(releaseInfo, ".", 2)
 	if len(fields) != 2 {
 		err = fmt.Errorf("Unknown release information `%s`", releaseInfo)
-		return releaseTime, err
+		return sha256Hex, releaseTime, err
 	}
 	if fields[0] != "minio" {
 		err = fmt.Errorf("Unknown release `%s`", releaseInfo)
-		return releaseTime, err
+		return sha256Hex, releaseTime, err
 	}
 
 	releaseTime, err = releaseTagToReleaseTime(fields[1])
@@ -359,13 +366,13 @@ func parseReleaseData(data string) (releaseTime time.Time, err error) {
 		err = fmt.Errorf("Unknown release tag format. %s", err)
 	}
 
-	return releaseTime, err
+	return sha256Hex, releaseTime, err
 }
 
-func getLatestReleaseTime(timeout time.Duration, mode string) (releaseTime time.Time, err error) {
+func getLatestReleaseTime(timeout time.Duration, mode string) (sha256Hex string, releaseTime time.Time, err error) {
 	data, err := DownloadReleaseData(timeout, mode)
 	if err != nil {
-		return releaseTime, err
+		return sha256Hex, releaseTime, err
 	}
 
 	return parseReleaseData(data)
@@ -406,49 +413,105 @@ func getDownloadURL(releaseTag string) (downloadURL string) {
 	return minioReleaseURL + "minio"
 }
 
-func getUpdateInfo(timeout time.Duration, mode string) (older time.Duration, downloadURL string, err error) {
+func getUpdateInfo(timeout time.Duration, mode string) (updateMsg string, sha256Hex string, currentReleaseTime, latestReleaseTime time.Time, err error) {
-	var currentReleaseTime, latestReleaseTime time.Time
 	currentReleaseTime, err = GetCurrentReleaseTime()
 	if err != nil {
-		return older, downloadURL, err
+		return updateMsg, sha256Hex, currentReleaseTime, latestReleaseTime, err
 	}
 
-	latestReleaseTime, err = getLatestReleaseTime(timeout, mode)
+	sha256Hex, latestReleaseTime, err = getLatestReleaseTime(timeout, mode)
 	if err != nil {
-		return older, downloadURL, err
+		return updateMsg, sha256Hex, currentReleaseTime, latestReleaseTime, err
 	}
 
+	var older time.Duration
+	var downloadURL string
 	if latestReleaseTime.After(currentReleaseTime) {
 		older = latestReleaseTime.Sub(currentReleaseTime)
 		downloadURL = getDownloadURL(releaseTimeToReleaseTag(latestReleaseTime))
 	}
 
-	return older, downloadURL, nil
+	return prepareUpdateMessage(downloadURL, older), sha256Hex, currentReleaseTime, latestReleaseTime, nil
+}
+
+func doUpdate(sha256Hex string, latestReleaseTime time.Time, ok bool) (successMsg string, err error) {
+	if !ok {
+		successMsg = greenColorSprintf("Minio update to version RELEASE.%s cancelled.",
+			latestReleaseTime.Format(minioReleaseTagTimeLayout))
+		return successMsg, nil
+	}
+	var sha256Sum []byte
+	sha256Sum, err = hex.DecodeString(sha256Hex)
+	if err != nil {
+		return successMsg, err
+	}
+
+	resp, err := http.Get(getDownloadURL(releaseTimeToReleaseTag(latestReleaseTime)))
+	if err != nil {
+		return successMsg, err
+	}
+	defer resp.Body.Close()
+
+	// FIXME: add support for gpg verification as well.
+	if err = update.RollbackError(update.Apply(resp.Body,
+		update.Options{
+			Hash:     crypto.SHA256,
+			Checksum: sha256Sum,
+		},
+	)); err != nil {
+		return successMsg, err
+	}
+
+	return greenColorSprintf("Minio updated to version RELEASE.%s successfully.",
+		latestReleaseTime.Format(minioReleaseTagTimeLayout)), nil
+}
+
+func shouldUpdate(quiet bool, sha256Hex string, latestReleaseTime time.Time) (ok bool) {
+	ok = true
+	if !quiet {
+		ok = prompt.Confirm(greenColorSprintf("Update to RELEASE.%s [%s]", latestReleaseTime.Format(minioReleaseTagTimeLayout), "yes"))
+	}
+	return ok
 }
 
-func mainUpdate(ctx *cli.Context) {
+var greenColorSprintf = color.New(color.FgGreen, color.Bold).SprintfFunc()
+
+func mainUpdate(ctx *cli.Context) error {
 	if len(ctx.Args()) != 0 {
 		cli.ShowCommandHelpAndExit(ctx, "update", -1)
 	}
 
+	handleCommonEnvVars()
+
 	quiet := ctx.Bool("quiet") || ctx.GlobalBool("quiet")
 	if quiet {
 		log.EnableQuiet()
 	}
 
 	minioMode := ""
-	older, downloadURL, err := getUpdateInfo(10*time.Second, minioMode)
+	updateMsg, sha256Hex, _, latestReleaseTime, err := getUpdateInfo(10*time.Second, minioMode)
 	if err != nil {
 		log.Println(err)
 		os.Exit(-1)
 	}
 
-	if updateMsg := computeUpdateMessage(downloadURL, older); updateMsg != "" {
+	// Nothing to update running the latest release.
-		log.Println(updateMsg)
+	if updateMsg == "" {
-		os.Exit(1)
+		log.Println(greenColorSprintf("You are already running the most recent version of ‘minio’."))
+		return nil
 	}
 
-	colorSprintf := color.New(color.FgGreen, color.Bold).SprintfFunc()
+	log.Println(updateMsg)
-	log.Println(colorSprintf("You are already running the most recent version of ‘minio’."))
+	// if the in-place update is disabled then we shouldn't ask the
-	os.Exit(0)
+	// user to update the binaries.
+	if strings.Contains(updateMsg, minioReleaseURL) && !globalInplaceUpdateDisabled {
+		var successMsg string
+		successMsg, err = doUpdate(sha256Hex, latestReleaseTime, shouldUpdate(quiet, sha256Hex, latestReleaseTime))
+		if err != nil {
+			log.Println(err)
+			os.Exit(-1)
+		}
+		log.Println(successMsg)
+	}
+	return nil
 }

cmd/update-main_test.go

@@ -263,20 +263,21 @@ func TestDownloadReleaseData(t *testing.T) {
 func TestParseReleaseData(t *testing.T) {
 	releaseTime, _ := releaseTagToReleaseTime("RELEASE.2016-10-07T01-16-39Z")
 	testCases := []struct {
-		data           string
+		data              string
-		expectedResult time.Time
+		expectedResult    time.Time
-		expectedErr    error
+		expectedSha256hex string
+		expectedErr       error
 	}{
-		{"more than two fields", time.Time{}, fmt.Errorf("Unknown release data `more than two fields`")},
+		{"more than two fields", time.Time{}, "", fmt.Errorf("Unknown release data `more than two fields`")},
-		{"more than", time.Time{}, fmt.Errorf("Unknown release information `than`")},
+		{"more than", time.Time{}, "", fmt.Errorf("Unknown release information `than`")},
-		{"more than.two.fields", time.Time{}, fmt.Errorf("Unknown release `than.two.fields`")},
+		{"more than.two.fields", time.Time{}, "", fmt.Errorf("Unknown release `than.two.fields`")},
-		{"more minio.RELEASE.fields", time.Time{}, fmt.Errorf(`Unknown release tag format. parsing time "fields" as "2006-01-02T15-04-05Z": cannot parse "fields" as "2006"`)},
+		{"more minio.RELEASE.fields", time.Time{}, "", fmt.Errorf(`Unknown release tag format. parsing time "fields" as "2006-01-02T15-04-05Z": cannot parse "fields" as "2006"`)},
-		{"more minio.RELEASE.2016-10-07T01-16-39Z", releaseTime, nil},
+		{"more minio.RELEASE.2016-10-07T01-16-39Z", releaseTime, "more", nil},
-		{"fbe246edbd382902db9a4035df7dce8cb441357d minio.RELEASE.2016-10-07T01-16-39Z\n", releaseTime, nil},
+		{"fbe246edbd382902db9a4035df7dce8cb441357d minio.RELEASE.2016-10-07T01-16-39Z\n", releaseTime, "fbe246edbd382902db9a4035df7dce8cb441357d", nil},
 	}
 
 	for i, testCase := range testCases {
-		result, err := parseReleaseData(testCase.data)
+		sha256Hex, result, err := parseReleaseData(testCase.data)
 		if testCase.expectedErr == nil {
 			if err != nil {
 				t.Errorf("error case %d: expected: %v, got: %v", i+1, testCase.expectedErr, err)
@@ -286,9 +287,13 @@ func TestParseReleaseData(t *testing.T) {
 		} else if testCase.expectedErr.Error() != err.Error() {
 			t.Errorf("error case %d: expected: %v, got: %v", i+1, testCase.expectedErr, err)
 		}
-
+		if err == nil {
-		if !testCase.expectedResult.Equal(result) {
+			if sha256Hex != testCase.expectedSha256hex {
-			t.Errorf("case %d: result: expected: %v, got: %v", i+1, testCase.expectedResult, result)
+				t.Errorf("case %d: result: expected: %v, got: %v", i+1, testCase.expectedSha256hex, sha256Hex)
+			}
+			if !testCase.expectedResult.Equal(result) {
+				t.Errorf("case %d: result: expected: %v, got: %v", i+1, testCase.expectedResult, result)
+			}
 		}
 	}
 }

cmd/update-notifier.go

@@ -28,9 +28,9 @@ import (
 	"github.com/fatih/color"
 )
 
-// computeUpdateMessage - calculates the update message, only if a
+// prepareUpdateMessage - prepares the update message, only if a
 // newer version is available.
-func computeUpdateMessage(downloadURL string, older time.Duration) string {
+func prepareUpdateMessage(downloadURL string, older time.Duration) string {
 	if downloadURL == "" || older <= 0 {
 		return ""
 	}

cmd/update-notifier_test.go

@@ -26,7 +26,7 @@ import (
 )
 
 // Tests update notifier string builder.
-func TestComputeUpdateMessage(t *testing.T) {
+func TestPrepareUpdateMessage(t *testing.T) {
 	testCases := []struct {
 		older time.Duration
 		dlURL string
@@ -71,7 +71,7 @@ func TestComputeUpdateMessage(t *testing.T) {
 	cyan := color.New(color.FgCyan, color.Bold).SprintFunc()
 
 	for i, testCase := range testCases {
-		output := computeUpdateMessage(testCase.dlURL, testCase.older)
+		output := prepareUpdateMessage(testCase.dlURL, testCase.older)
 		line1 := fmt.Sprintf("%s %s", plainMsg, yellow(testCase.expectedSubStr))
 		line2 := fmt.Sprintf("Update: %s", cyan(testCase.dlURL))
 		// Uncomment below to see message appearance:

vendor/github.com/howeyc/gopass/LICENSE.txt

@@ -0,0 +1,15 @@
+ISC License
+
+Copyright (c) 2012 Chris Howey
+
+Permission to use, copy, modify, and distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

vendor/github.com/howeyc/gopass/OPENSOLARIS.LICENSE

@@ -0,0 +1,384 @@
+Unless otherwise noted, all files in this distribution are released
+under the Common Development and Distribution License (CDDL).
+Exceptions are noted within the associated source files.
+
+--------------------------------------------------------------------
+
+
+COMMON DEVELOPMENT AND DISTRIBUTION LICENSE Version 1.0
+
+1. Definitions.
+
+    1.1. "Contributor" means each individual or entity that creates
+         or contributes to the creation of Modifications.
+
+    1.2. "Contributor Version" means the combination of the Original
+         Software, prior Modifications used by a Contributor (if any),
+         and the Modifications made by that particular Contributor.
+
+    1.3. "Covered Software" means (a) the Original Software, or (b)
+         Modifications, or (c) the combination of files containing
+         Original Software with files containing Modifications, in
+         each case including portions thereof.
+
+    1.4. "Executable" means the Covered Software in any form other
+         than Source Code.
+
+    1.5. "Initial Developer" means the individual or entity that first
+         makes Original Software available under this License.
+
+    1.6. "Larger Work" means a work which combines Covered Software or
+         portions thereof with code not governed by the terms of this
+         License.
+
+    1.7. "License" means this document.
+
+    1.8. "Licensable" means having the right to grant, to the maximum
+         extent possible, whether at the time of the initial grant or
+         subsequently acquired, any and all of the rights conveyed
+         herein.
+
+    1.9. "Modifications" means the Source Code and Executable form of
+         any of the following:
+
+        A. Any file that results from an addition to, deletion from or
+           modification of the contents of a file containing Original
+           Software or previous Modifications;
+
+        B. Any new file that contains any part of the Original
+           Software or previous Modifications; or
+
+        C. Any new file that is contributed or otherwise made
+           available under the terms of this License.
+
+    1.10. "Original Software" means the Source Code and Executable
+          form of computer software code that is originally released
+          under this License.
+
+    1.11. "Patent Claims" means any patent claim(s), now owned or
+          hereafter acquired, including without limitation, method,
+          process, and apparatus claims, in any patent Licensable by
+          grantor.
+
+    1.12. "Source Code" means (a) the common form of computer software
+          code in which modifications are made and (b) associated
+          documentation included in or with such code.
+
+    1.13. "You" (or "Your") means an individual or a legal entity
+          exercising rights under, and complying with all of the terms
+          of, this License.  For legal entities, "You" includes any
+          entity which controls, is controlled by, or is under common
+          control with You.  For purposes of this definition,
+          "control" means (a) the power, direct or indirect, to cause
+          the direction or management of such entity, whether by
+          contract or otherwise, or (b) ownership of more than fifty
+          percent (50%) of the outstanding shares or beneficial
+          ownership of such entity.
+
+2. License Grants.
+
+    2.1. The Initial Developer Grant.
+
+    Conditioned upon Your compliance with Section 3.1 below and
+    subject to third party intellectual property claims, the Initial
+    Developer hereby grants You a world-wide, royalty-free,
+    non-exclusive license:
+
+        (a) under intellectual property rights (other than patent or
+            trademark) Licensable by Initial Developer, to use,
+            reproduce, modify, display, perform, sublicense and
+            distribute the Original Software (or portions thereof),
+            with or without Modifications, and/or as part of a Larger
+            Work; and
+
+        (b) under Patent Claims infringed by the making, using or
+            selling of Original Software, to make, have made, use,
+            practice, sell, and offer for sale, and/or otherwise
+            dispose of the Original Software (or portions thereof).
+
+        (c) The licenses granted in Sections 2.1(a) and (b) are
+            effective on the date Initial Developer first distributes
+            or otherwise makes the Original Software available to a
+            third party under the terms of this License.
+
+        (d) Notwithstanding Section 2.1(b) above, no patent license is
+            granted: (1) for code that You delete from the Original
+            Software, or (2) for infringements caused by: (i) the
+            modification of the Original Software, or (ii) the
+            combination of the Original Software with other software
+            or devices.
+
+    2.2. Contributor Grant.
+
+    Conditioned upon Your compliance with Section 3.1 below and
+    subject to third party intellectual property claims, each
+    Contributor hereby grants You a world-wide, royalty-free,
+    non-exclusive license:
+
+        (a) under intellectual property rights (other than patent or
+            trademark) Licensable by Contributor to use, reproduce,
+            modify, display, perform, sublicense and distribute the
+            Modifications created by such Contributor (or portions
+            thereof), either on an unmodified basis, with other
+            Modifications, as Covered Software and/or as part of a
+            Larger Work; and
+
+        (b) under Patent Claims infringed by the making, using, or
+            selling of Modifications made by that Contributor either
+            alone and/or in combination with its Contributor Version
+            (or portions of such combination), to make, use, sell,
+            offer for sale, have made, and/or otherwise dispose of:
+            (1) Modifications made by that Contributor (or portions
+            thereof); and (2) the combination of Modifications made by
+            that Contributor with its Contributor Version (or portions
+            of such combination).
+
+        (c) The licenses granted in Sections 2.2(a) and 2.2(b) are
+            effective on the date Contributor first distributes or
+            otherwise makes the Modifications available to a third
+            party.
+
+        (d) Notwithstanding Section 2.2(b) above, no patent license is
+            granted: (1) for any code that Contributor has deleted
+            from the Contributor Version; (2) for infringements caused
+            by: (i) third party modifications of Contributor Version,
+            or (ii) the combination of Modifications made by that
+            Contributor with other software (except as part of the
+            Contributor Version) or other devices; or (3) under Patent
+            Claims infringed by Covered Software in the absence of
+            Modifications made by that Contributor.
+
+3. Distribution Obligations.
+
+    3.1. Availability of Source Code.
+
+    Any Covered Software that You distribute or otherwise make
+    available in Executable form must also be made available in Source
+    Code form and that Source Code form must be distributed only under
+    the terms of this License.  You must include a copy of this
+    License with every copy of the Source Code form of the Covered
+    Software You distribute or otherwise make available.  You must
+    inform recipients of any such Covered Software in Executable form
+    as to how they can obtain such Covered Software in Source Code
+    form in a reasonable manner on or through a medium customarily
+    used for software exchange.
+
+    3.2. Modifications.
+
+    The Modifications that You create or to which You contribute are
+    governed by the terms of this License.  You represent that You
+    believe Your Modifications are Your original creation(s) and/or
+    You have sufficient rights to grant the rights conveyed by this
+    License.
+
+    3.3. Required Notices.
+
+    You must include a notice in each of Your Modifications that
+    identifies You as the Contributor of the Modification.  You may
+    not remove or alter any copyright, patent or trademark notices
+    contained within the Covered Software, or any notices of licensing
+    or any descriptive text giving attribution to any Contributor or
+    the Initial Developer.
+
+    3.4. Application of Additional Terms.
+
+    You may not offer or impose any terms on any Covered Software in
+    Source Code form that alters or restricts the applicable version
+    of this License or the recipients' rights hereunder.  You may
+    choose to offer, and to charge a fee for, warranty, support,
+    indemnity or liability obligations to one or more recipients of
+    Covered Software.  However, you may do so only on Your own behalf,
+    and not on behalf of the Initial Developer or any Contributor.
+    You must make it absolutely clear that any such warranty, support,
+    indemnity or liability obligation is offered by You alone, and You
+    hereby agree to indemnify the Initial Developer and every
+    Contributor for any liability incurred by the Initial Developer or
+    such Contributor as a result of warranty, support, indemnity or
+    liability terms You offer.
+
+    3.5. Distribution of Executable Versions.
+
+    You may distribute the Executable form of the Covered Software
+    under the terms of this License or under the terms of a license of
+    Your choice, which may contain terms different from this License,
+    provided that You are in compliance with the terms of this License
+    and that the license for the Executable form does not attempt to
+    limit or alter the recipient's rights in the Source Code form from
+    the rights set forth in this License.  If You distribute the
+    Covered Software in Executable form under a different license, You
+    must make it absolutely clear that any terms which differ from
+    this License are offered by You alone, not by the Initial
+    Developer or Contributor.  You hereby agree to indemnify the
+    Initial Developer and every Contributor for any liability incurred
+    by the Initial Developer or such Contributor as a result of any
+    such terms You offer.
+
+    3.6. Larger Works.
+
+    You may create a Larger Work by combining Covered Software with
+    other code not governed by the terms of this License and
+    distribute the Larger Work as a single product.  In such a case,
+    You must make sure the requirements of this License are fulfilled
+    for the Covered Software.
+
+4. Versions of the License.
+
+    4.1. New Versions.
+
+    Sun Microsystems, Inc. is the initial license steward and may
+    publish revised and/or new versions of this License from time to
+    time.  Each version will be given a distinguishing version number.
+    Except as provided in Section 4.3, no one other than the license
+    steward has the right to modify this License.
+
+    4.2. Effect of New Versions.
+
+    You may always continue to use, distribute or otherwise make the
+    Covered Software available under the terms of the version of the
+    License under which You originally received the Covered Software.
+    If the Initial Developer includes a notice in the Original
+    Software prohibiting it from being distributed or otherwise made
+    available under any subsequent version of the License, You must
+    distribute and make the Covered Software available under the terms
+    of the version of the License under which You originally received
+    the Covered Software.  Otherwise, You may also choose to use,
+    distribute or otherwise make the Covered Software available under
+    the terms of any subsequent version of the License published by
+    the license steward.
+
+    4.3. Modified Versions.
+
+    When You are an Initial Developer and You want to create a new
+    license for Your Original Software, You may create and use a
+    modified version of this License if You: (a) rename the license
+    and remove any references to the name of the license steward
+    (except to note that the license differs from this License); and
+    (b) otherwise make it clear that the license contains terms which
+    differ from this License.
+
+5. DISCLAIMER OF WARRANTY.
+
+    COVERED SOFTWARE IS PROVIDED UNDER THIS LICENSE ON AN "AS IS"
+    BASIS, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED,
+    INCLUDING, WITHOUT LIMITATION, WARRANTIES THAT THE COVERED
+    SOFTWARE IS FREE OF DEFECTS, MERCHANTABLE, FIT FOR A PARTICULAR
+    PURPOSE OR NON-INFRINGING.  THE ENTIRE RISK AS TO THE QUALITY AND
+    PERFORMANCE OF THE COVERED SOFTWARE IS WITH YOU.  SHOULD ANY
+    COVERED SOFTWARE PROVE DEFECTIVE IN ANY RESPECT, YOU (NOT THE
+    INITIAL DEVELOPER OR ANY OTHER CONTRIBUTOR) ASSUME THE COST OF ANY
+    NECESSARY SERVICING, REPAIR OR CORRECTION.  THIS DISCLAIMER OF
+    WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS LICENSE.  NO USE OF
+    ANY COVERED SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER THIS
+    DISCLAIMER.
+
+6. TERMINATION.
+
+    6.1. This License and the rights granted hereunder will terminate
+    automatically if You fail to comply with terms herein and fail to
+    cure such breach within 30 days of becoming aware of the breach.
+    Provisions which, by their nature, must remain in effect beyond
+    the termination of this License shall survive.
+
+    6.2. If You assert a patent infringement claim (excluding
+    declaratory judgment actions) against Initial Developer or a
+    Contributor (the Initial Developer or Contributor against whom You
+    assert such claim is referred to as "Participant") alleging that
+    the Participant Software (meaning the Contributor Version where
+    the Participant is a Contributor or the Original Software where
+    the Participant is the Initial Developer) directly or indirectly
+    infringes any patent, then any and all rights granted directly or
+    indirectly to You by such Participant, the Initial Developer (if
+    the Initial Developer is not the Participant) and all Contributors
+    under Sections 2.1 and/or 2.2 of this License shall, upon 60 days
+    notice from Participant terminate prospectively and automatically
+    at the expiration of such 60 day notice period, unless if within
+    such 60 day period You withdraw Your claim with respect to the
+    Participant Software against such Participant either unilaterally
+    or pursuant to a written agreement with Participant.
+
+    6.3. In the event of termination under Sections 6.1 or 6.2 above,
+    all end user licenses that have been validly granted by You or any
+    distributor hereunder prior to termination (excluding licenses
+    granted to You by any distributor) shall survive termination.
+
+7. LIMITATION OF LIABILITY.
+
+    UNDER NO CIRCUMSTANCES AND UNDER NO LEGAL THEORY, WHETHER TORT
+    (INCLUDING NEGLIGENCE), CONTRACT, OR OTHERWISE, SHALL YOU, THE
+    INITIAL DEVELOPER, ANY OTHER CONTRIBUTOR, OR ANY DISTRIBUTOR OF
+    COVERED SOFTWARE, OR ANY SUPPLIER OF ANY OF SUCH PARTIES, BE
+    LIABLE TO ANY PERSON FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR
+    CONSEQUENTIAL DAMAGES OF ANY CHARACTER INCLUDING, WITHOUT
+    LIMITATION, DAMAGES FOR LOST PROFITS, LOSS OF GOODWILL, WORK
+    STOPPAGE, COMPUTER FAILURE OR MALFUNCTION, OR ANY AND ALL OTHER
+    COMMERCIAL DAMAGES OR LOSSES, EVEN IF SUCH PARTY SHALL HAVE BEEN
+    INFORMED OF THE POSSIBILITY OF SUCH DAMAGES.  THIS LIMITATION OF
+    LIABILITY SHALL NOT APPLY TO LIABILITY FOR DEATH OR PERSONAL
+    INJURY RESULTING FROM SUCH PARTY'S NEGLIGENCE TO THE EXTENT
+    APPLICABLE LAW PROHIBITS SUCH LIMITATION.  SOME JURISDICTIONS DO
+    NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL OR
+    CONSEQUENTIAL DAMAGES, SO THIS EXCLUSION AND LIMITATION MAY NOT
+    APPLY TO YOU.
+
+8. U.S. GOVERNMENT END USERS.
+
+    The Covered Software is a "commercial item," as that term is
+    defined in 48 C.F.R. 2.101 (Oct. 1995), consisting of "commercial
+    computer software" (as that term is defined at 48
+    C.F.R. 252.227-7014(a)(1)) and "commercial computer software
+    documentation" as such terms are used in 48 C.F.R. 12.212
+    (Sept. 1995).  Consistent with 48 C.F.R. 12.212 and 48
+    C.F.R. 227.7202-1 through 227.7202-4 (June 1995), all
+    U.S. Government End Users acquire Covered Software with only those
+    rights set forth herein.  This U.S. Government Rights clause is in
+    lieu of, and supersedes, any other FAR, DFAR, or other clause or
+    provision that addresses Government rights in computer software
+    under this License.
+
+9. MISCELLANEOUS.
+
+    This License represents the complete agreement concerning subject
+    matter hereof.  If any provision of this License is held to be
+    unenforceable, such provision shall be reformed only to the extent
+    necessary to make it enforceable.  This License shall be governed
+    by the law of the jurisdiction specified in a notice contained
+    within the Original Software (except to the extent applicable law,
+    if any, provides otherwise), excluding such jurisdiction's
+    conflict-of-law provisions.  Any litigation relating to this
+    License shall be subject to the jurisdiction of the courts located
+    in the jurisdiction and venue specified in a notice contained
+    within the Original Software, with the losing party responsible
+    for costs, including, without limitation, court costs and
+    reasonable attorneys' fees and expenses.  The application of the
+    United Nations Convention on Contracts for the International Sale
+    of Goods is expressly excluded.  Any law or regulation which
+    provides that the language of a contract shall be construed
+    against the drafter shall not apply to this License.  You agree
+    that You alone are responsible for compliance with the United
+    States export administration regulations (and the export control
+    laws and regulation of any other countries) when You use,
+    distribute or otherwise make available any Covered Software.
+
+10. RESPONSIBILITY FOR CLAIMS.
+
+    As between Initial Developer and the Contributors, each party is
+    responsible for claims and damages arising, directly or
+    indirectly, out of its utilization of rights under this License
+    and You agree to work with Initial Developer and Contributors to
+    distribute such responsibility on an equitable basis.  Nothing
+    herein is intended or shall be deemed to constitute any admission
+    of liability.
+
+--------------------------------------------------------------------
+
+NOTICE PURSUANT TO SECTION 9 OF THE COMMON DEVELOPMENT AND
+DISTRIBUTION LICENSE (CDDL)
+
+For Covered Software in this distribution, this License shall
+be governed by the laws of the State of California (excluding
+conflict-of-law provisions).
+
+Any litigation relating to this License shall be subject to the
+jurisdiction of the Federal Courts of the Northern District of
+California and the state courts of the State of California, with
+venue lying in Santa Clara County, California.

vendor/github.com/howeyc/gopass/README.md

@@ -0,0 +1,27 @@
+# getpasswd in Go [![GoDoc](https://godoc.org/github.com/howeyc/gopass?status.svg)](https://godoc.org/github.com/howeyc/gopass) [![Build Status](https://secure.travis-ci.org/howeyc/gopass.png?branch=master)](http://travis-ci.org/howeyc/gopass)
+
+Retrieve password from user terminal or piped input without echo.
+
+Verified on BSD, Linux, and Windows.
+
+Example:
+```go
+package main
+
+import "fmt"
+import "github.com/howeyc/gopass"
+
+func main() {
+	fmt.Printf("Password: ")
+
+	// Silent. For printing *'s use gopass.GetPasswdMasked()
+	pass, err := gopass.GetPasswd()
+	if err != nil {
+		// Handle gopass.ErrInterrupted or getch() read error
+	}
+
+	// Do something with pass
+}
+```
+
+Caution: Multi-byte characters not supported!

vendor/github.com/howeyc/gopass/pass.go

@@ -0,0 +1,110 @@
+package gopass
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"os"
+)
+
+type FdReader interface {
+	io.Reader
+	Fd() uintptr
+}
+
+var defaultGetCh = func(r io.Reader) (byte, error) {
+	buf := make([]byte, 1)
+	if n, err := r.Read(buf); n == 0 || err != nil {
+		if err != nil {
+			return 0, err
+		}
+		return 0, io.EOF
+	}
+	return buf[0], nil
+}
+
+var (
+	maxLength            = 512
+	ErrInterrupted       = errors.New("interrupted")
+	ErrMaxLengthExceeded = fmt.Errorf("maximum byte limit (%v) exceeded", maxLength)
+
+	// Provide variable so that tests can provide a mock implementation.
+	getch = defaultGetCh
+)
+
+// getPasswd returns the input read from terminal.
+// If prompt is not empty, it will be output as a prompt to the user
+// If masked is true, typing will be matched by asterisks on the screen.
+// Otherwise, typing will echo nothing.
+func getPasswd(prompt string, masked bool, r FdReader, w io.Writer) ([]byte, error) {
+	var err error
+	var pass, bs, mask []byte
+	if masked {
+		bs = []byte("\b \b")
+		mask = []byte("*")
+	}
+
+	if isTerminal(r.Fd()) {
+		if oldState, err := makeRaw(r.Fd()); err != nil {
+			return pass, err
+		} else {
+			defer func() {
+				restore(r.Fd(), oldState)
+				fmt.Fprintln(w)
+			}()
+		}
+	}
+
+	if prompt != "" {
+		fmt.Fprint(w, prompt)
+	}
+
+	// Track total bytes read, not just bytes in the password.  This ensures any
+	// errors that might flood the console with nil or -1 bytes infinitely are
+	// capped.
+	var counter int
+	for counter = 0; counter <= maxLength; counter++ {
+		if v, e := getch(r); e != nil {
+			err = e
+			break
+		} else if v == 127 || v == 8 {
+			if l := len(pass); l > 0 {
+				pass = pass[:l-1]
+				fmt.Fprint(w, string(bs))
+			}
+		} else if v == 13 || v == 10 {
+			break
+		} else if v == 3 {
+			err = ErrInterrupted
+			break
+		} else if v != 0 {
+			pass = append(pass, v)
+			fmt.Fprint(w, string(mask))
+		}
+	}
+
+	if counter > maxLength {
+		err = ErrMaxLengthExceeded
+	}
+
+	return pass, err
+}
+
+// GetPasswd returns the password read from the terminal without echoing input.
+// The returned byte array does not include end-of-line characters.
+func GetPasswd() ([]byte, error) {
+	return getPasswd("", false, os.Stdin, os.Stdout)
+}
+
+// GetPasswdMasked returns the password read from the terminal, echoing asterisks.
+// The returned byte array does not include end-of-line characters.
+func GetPasswdMasked() ([]byte, error) {
+	return getPasswd("", true, os.Stdin, os.Stdout)
+}
+
+// GetPasswdPrompt prompts the user and returns the password read from the terminal.
+// If mask is true, then asterisks are echoed.
+// The returned byte array does not include end-of-line characters.
+func GetPasswdPrompt(prompt string, mask bool, r FdReader, w io.Writer) ([]byte, error) {
+	return getPasswd(prompt, mask, r, w)
+}

vendor/github.com/howeyc/gopass/terminal.go

@@ -0,0 +1,25 @@
+// +build !solaris
+
+package gopass
+
+import "golang.org/x/crypto/ssh/terminal"
+
+type terminalState struct {
+	state *terminal.State
+}
+
+func isTerminal(fd uintptr) bool {
+	return terminal.IsTerminal(int(fd))
+}
+
+func makeRaw(fd uintptr) (*terminalState, error) {
+	state, err := terminal.MakeRaw(int(fd))
+
+	return &terminalState{
+		state: state,
+	}, err
+}
+
+func restore(fd uintptr, oldState *terminalState) error {
+	return terminal.Restore(int(fd), oldState.state)
+}

vendor/github.com/howeyc/gopass/terminal_solaris.go

@@ -0,0 +1,69 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (the "License").  You may not use this file except in compliance
+ * with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+// Below is derived from Solaris source, so CDDL license is included.
+
+package gopass
+
+import (
+	"syscall"
+
+	"golang.org/x/sys/unix"
+)
+
+type terminalState struct {
+	state *unix.Termios
+}
+
+// isTerminal returns true if there is a terminal attached to the given
+// file descriptor.
+// Source: http://src.illumos.org/source/xref/illumos-gate/usr/src/lib/libbc/libc/gen/common/isatty.c
+func isTerminal(fd uintptr) bool {
+	var termio unix.Termio
+	err := unix.IoctlSetTermio(int(fd), unix.TCGETA, &termio)
+	return err == nil
+}
+
+// makeRaw puts the terminal connected to the given file descriptor into raw
+// mode and returns the previous state of the terminal so that it can be
+// restored.
+// Source: http://src.illumos.org/source/xref/illumos-gate/usr/src/lib/libast/common/uwin/getpass.c
+func makeRaw(fd uintptr) (*terminalState, error) {
+	oldTermiosPtr, err := unix.IoctlGetTermios(int(fd), unix.TCGETS)
+	if err != nil {
+		return nil, err
+	}
+	oldTermios := *oldTermiosPtr
+
+	newTermios := oldTermios
+	newTermios.Lflag &^= syscall.ECHO | syscall.ECHOE | syscall.ECHOK | syscall.ECHONL
+	if err := unix.IoctlSetTermios(int(fd), unix.TCSETS, &newTermios); err != nil {
+		return nil, err
+	}
+
+	return &terminalState{
+		state: oldTermiosPtr,
+	}, nil
+}
+
+func restore(fd uintptr, oldState *terminalState) error {
+	return unix.IoctlSetTermios(int(fd), unix.TCSETS, oldState.state)
+}

vendor/github.com/inconshreveable/go-update/LICENSE

@@ -0,0 +1,13 @@
+Copyright 2015 Alan Shreve
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+   http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.

vendor/github.com/inconshreveable/go-update/README.md

@@ -0,0 +1,65 @@
+# go-update: Build self-updating Go programs [![godoc reference](https://godoc.org/github.com/inconshreveable/go-update?status.png)](https://godoc.org/github.com/inconshreveable/go-update)
+
+Package update provides functionality to implement secure, self-updating Go programs (or other single-file targets)
+A program can update itself by replacing its executable file with a new version.
+
+It provides the flexibility to implement different updating user experiences
+like auto-updating, or manual user-initiated updates. It also boasts
+advanced features like binary patching and code signing verification.
+
+Example of updating from a URL:
+
+```go
+import (
+    "fmt"
+    "net/http"
+
+    "github.com/inconshreveable/go-update"
+)
+
+func doUpdate(url string) error {
+    resp, err := http.Get(url)
+    if err != nil {
+        return err
+    }
+    defer resp.Body.Close()
+    err := update.Apply(resp.Body, update.Options{})
+    if err != nil {
+        // error handling
+    }
+    return err
+}
+```
+
+## Features
+
+- Cross platform support (Windows too!)
+- Binary patch application
+- Checksum verification
+- Code signing verification
+- Support for updating arbitrary files
+
+## [equinox.io](https://equinox.io)
+[equinox.io](https://equinox.io) is a complete ready-to-go updating solution built on top of go-update that provides:
+
+- Hosted updates
+- Update channels (stable, beta, nightly, ...)
+- Dynamically computed binary diffs
+- Automatic key generation and code
+- Release tooling with proper code signing
+- Update/download metrics
+
+## API Compatibility Promises
+The master branch of `go-update` is *not* guaranteed to have a stable API over time. For any production application, you should vendor
+your dependency on `go-update` with a tool like git submodules, [gb](http://getgb.io/) or [govendor](https://github.com/kardianos/govendor).
+
+The `go-update` package makes the following promises about API compatibility:
+1. A list of all API-breaking changes will be documented in this README.
+1. `go-update` will strive for as few API-breaking changes as possible.
+
+## API Breaking Changes
+- **Sept 3, 2015**: The `Options` struct passed to `Apply` was changed to be passed by value instead of passed by pointer. Old API at `28de026`.
+- **Aug 9, 2015**: 2.0 API. Old API at `221d034` or `gopkg.in/inconshreveable/go-update.v0`.
+
+## License
+Apache

vendor/github.com/inconshreveable/go-update/apply.go

@@ -0,0 +1,322 @@
+package update
+
+import (
+	"bytes"
+	"crypto"
+	"crypto/x509"
+	"encoding/pem"
+	"errors"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+
+	"github.com/inconshreveable/go-update/internal/osext"
+)
+
+var (
+	openFile = os.OpenFile
+)
+
+// Apply performs an update of the current executable (or opts.TargetFile, if set) with the contents of the given io.Reader.
+//
+// Apply performs the following actions to ensure a safe cross-platform update:
+//
+// 1. If configured, applies the contents of the update io.Reader as a binary patch.
+//
+// 2. If configured, computes the checksum of the new executable and verifies it matches.
+//
+// 3. If configured, verifies the signature with a public key.
+//
+// 4. Creates a new file, /path/to/.target.new with the TargetMode with the contents of the updated file
+//
+// 5. Renames /path/to/target to /path/to/.target.old
+//
+// 6. Renames /path/to/.target.new to /path/to/target
+//
+// 7. If the final rename is successful, deletes /path/to/.target.old, returns no error. On Windows,
+// the removal of /path/to/target.old always fails, so instead Apply hides the old file instead.
+//
+// 8. If the final rename fails, attempts to roll back by renaming /path/to/.target.old
+// back to /path/to/target.
+//
+// If the roll back operation fails, the file system is left in an inconsistent state (betweet steps 5 and 6) where
+// there is no new executable file and the old executable file could not be be moved to its original location. In this
+// case you should notify the user of the bad news and ask them to recover manually. Applications can determine whether
+// the rollback failed by calling RollbackError, see the documentation on that function for additional detail.
+func Apply(update io.Reader, opts Options) error {
+	// validate
+	verify := false
+	switch {
+	case opts.Signature != nil && opts.PublicKey != nil:
+		// okay
+		verify = true
+	case opts.Signature != nil:
+		return errors.New("no public key to verify signature with")
+	case opts.PublicKey != nil:
+		return errors.New("No signature to verify with")
+	}
+
+	// set defaults
+	if opts.Hash == 0 {
+		opts.Hash = crypto.SHA256
+	}
+	if opts.Verifier == nil {
+		opts.Verifier = NewECDSAVerifier()
+	}
+	if opts.TargetMode == 0 {
+		opts.TargetMode = 0755
+	}
+
+	// get target path
+	var err error
+	opts.TargetPath, err = opts.getPath()
+	if err != nil {
+		return err
+	}
+
+	var newBytes []byte
+	if opts.Patcher != nil {
+		if newBytes, err = opts.applyPatch(update); err != nil {
+			return err
+		}
+	} else {
+		// no patch to apply, go on through
+		if newBytes, err = ioutil.ReadAll(update); err != nil {
+			return err
+		}
+	}
+
+	// verify checksum if requested
+	if opts.Checksum != nil {
+		if err = opts.verifyChecksum(newBytes); err != nil {
+			return err
+		}
+	}
+
+	if verify {
+		if err = opts.verifySignature(newBytes); err != nil {
+			return err
+		}
+	}
+
+	// get the directory the executable exists in
+	updateDir := filepath.Dir(opts.TargetPath)
+	filename := filepath.Base(opts.TargetPath)
+
+	// Copy the contents of newbinary to a new executable file
+	newPath := filepath.Join(updateDir, fmt.Sprintf(".%s.new", filename))
+	fp, err := openFile(newPath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, opts.TargetMode)
+	if err != nil {
+		return err
+	}
+	defer fp.Close()
+
+	_, err = io.Copy(fp, bytes.NewReader(newBytes))
+	if err != nil {
+		return err
+	}
+
+	// if we don't call fp.Close(), windows won't let us move the new executable
+	// because the file will still be "in use"
+	fp.Close()
+
+	// this is where we'll move the executable to so that we can swap in the updated replacement
+	oldPath := opts.OldSavePath
+	removeOld := opts.OldSavePath == ""
+	if removeOld {
+		oldPath = filepath.Join(updateDir, fmt.Sprintf(".%s.old", filename))
+	}
+
+	// delete any existing old exec file - this is necessary on Windows for two reasons:
+	// 1. after a successful update, Windows can't remove the .old file because the process is still running
+	// 2. windows rename operations fail if the destination file already exists
+	_ = os.Remove(oldPath)
+
+	// move the existing executable to a new file in the same directory
+	err = os.Rename(opts.TargetPath, oldPath)
+	if err != nil {
+		return err
+	}
+
+	// move the new exectuable in to become the new program
+	err = os.Rename(newPath, opts.TargetPath)
+
+	if err != nil {
+		// move unsuccessful
+		//
+		// The filesystem is now in a bad state. We have successfully
+		// moved the existing binary to a new location, but we couldn't move the new
+		// binary to take its place. That means there is no file where the current executable binary
+		// used to be!
+		// Try to rollback by restoring the old binary to its original path.
+		rerr := os.Rename(oldPath, opts.TargetPath)
+		if rerr != nil {
+			return &rollbackErr{err, rerr}
+		}
+
+		return err
+	}
+
+	// move successful, remove the old binary if needed
+	if removeOld {
+		errRemove := os.Remove(oldPath)
+
+		// windows has trouble with removing old binaries, so hide it instead
+		if errRemove != nil {
+			_ = hideFile(oldPath)
+		}
+	}
+
+	return nil
+}
+
+// RollbackError takes an error value returned by Apply and returns the error, if any,
+// that occurred when attempting to roll back from a failed update. Applications should
+// always call this function on any non-nil errors returned by Apply.
+//
+// If no rollback was needed or if the rollback was successful, RollbackError returns nil,
+// otherwise it returns the error encountered when trying to roll back.
+func RollbackError(err error) error {
+	if err == nil {
+		return nil
+	}
+	if rerr, ok := err.(*rollbackErr); ok {
+		return rerr.rollbackErr
+	}
+	return nil
+}
+
+type rollbackErr struct {
+	error             // original error
+	rollbackErr error // error encountered while rolling back
+}
+
+type Options struct {
+	// TargetPath defines the path to the file to update.
+	// The emptry string means 'the executable file of the running program'.
+	TargetPath string
+
+	// Create TargetPath replacement with this file mode. If zero, defaults to 0755.
+	TargetMode os.FileMode
+
+	// Checksum of the new binary to verify against. If nil, no checksum or signature verification is done.
+	Checksum []byte
+
+	// Public key to use for signature verification. If nil, no signature verification is done.
+	PublicKey crypto.PublicKey
+
+	// Signature to verify the updated file. If nil, no signature verification is done.
+	Signature []byte
+
+	// Pluggable signature verification algorithm. If nil, ECDSA is used.
+	Verifier Verifier
+
+	// Use this hash function to generate the checksum. If not set, SHA256 is used.
+	Hash crypto.Hash
+
+	// If nil, treat the update as a complete replacement for the contents of the file at TargetPath.
+	// If non-nil, treat the update contents as a patch and use this object to apply the patch.
+	Patcher Patcher
+
+	// Store the old executable file at this path after a successful update.
+	// The empty string means the old executable file will be removed after the update.
+	OldSavePath string
+}
+
+// CheckPermissions determines whether the process has the correct permissions to
+// perform the requested update. If the update can proceed, it returns nil, otherwise
+// it returns the error that would occur if an update were attempted.
+func (o *Options) CheckPermissions() error {
+	// get the directory the file exists in
+	path, err := o.getPath()
+	if err != nil {
+		return err
+	}
+
+	fileDir := filepath.Dir(path)
+	fileName := filepath.Base(path)
+
+	// attempt to open a file in the file's directory
+	newPath := filepath.Join(fileDir, fmt.Sprintf(".%s.new", fileName))
+	fp, err := openFile(newPath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, o.TargetMode)
+	if err != nil {
+		return err
+	}
+	fp.Close()
+
+	_ = os.Remove(newPath)
+	return nil
+}
+
+// SetPublicKeyPEM is a convenience method to set the PublicKey property
+// used for checking a completed update's signature by parsing a
+// Public Key formatted as PEM data.
+func (o *Options) SetPublicKeyPEM(pembytes []byte) error {
+	block, _ := pem.Decode(pembytes)
+	if block == nil {
+		return errors.New("couldn't parse PEM data")
+	}
+
+	pub, err := x509.ParsePKIXPublicKey(block.Bytes)
+	if err != nil {
+		return err
+	}
+	o.PublicKey = pub
+	return nil
+}
+
+func (o *Options) getPath() (string, error) {
+	if o.TargetPath == "" {
+		return osext.Executable()
+	} else {
+		return o.TargetPath, nil
+	}
+}
+
+func (o *Options) applyPatch(patch io.Reader) ([]byte, error) {
+	// open the file to patch
+	old, err := os.Open(o.TargetPath)
+	if err != nil {
+		return nil, err
+	}
+	defer old.Close()
+
+	// apply the patch
+	var applied bytes.Buffer
+	if err = o.Patcher.Patch(old, &applied, patch); err != nil {
+		return nil, err
+	}
+
+	return applied.Bytes(), nil
+}
+
+func (o *Options) verifyChecksum(updated []byte) error {
+	checksum, err := checksumFor(o.Hash, updated)
+	if err != nil {
+		return err
+	}
+
+	if !bytes.Equal(o.Checksum, checksum) {
+		return fmt.Errorf("Updated file has wrong checksum. Expected: %x, got: %x", o.Checksum, checksum)
+	}
+	return nil
+}
+
+func (o *Options) verifySignature(updated []byte) error {
+	checksum, err := checksumFor(o.Hash, updated)
+	if err != nil {
+		return err
+	}
+	return o.Verifier.VerifySignature(checksum, o.Signature, o.Hash, o.PublicKey)
+}
+
+func checksumFor(h crypto.Hash, payload []byte) ([]byte, error) {
+	if !h.Available() {
+		return nil, errors.New("requested hash function not available")
+	}
+	hash := h.New()
+	hash.Write(payload) // guaranteed not to error
+	return hash.Sum([]byte{}), nil
+}

vendor/github.com/inconshreveable/go-update/doc.go

@@ -0,0 +1,172 @@
+/*
+Package update provides functionality to implement secure, self-updating Go programs (or other single-file targets).
+
+For complete updating solutions please see Equinox (https://equinox.io) and go-tuf (https://github.com/flynn/go-tuf).
+
+Basic Example
+
+This example shows how to update a program remotely from a URL.
+
+	import (
+		"fmt"
+		"net/http"
+
+		"github.com/inconshreveable/go-update"
+	)
+
+	func doUpdate(url string) error {
+		// request the new file
+		resp, err := http.Get(url)
+		if err != nil {
+			return err
+		}
+		defer resp.Body.Close()
+		err := update.Apply(resp.Body, update.Options{})
+		if err != nil {
+			if rerr := update.RollbackError(err); rerr != nil {
+				fmt.Println("Failed to rollback from bad update: %v", rerr)
+			}
+		}
+		return err
+	}
+
+
+Binary Patching
+
+Go binaries can often be large. It can be advantageous to only ship a binary patch to a client
+instead of the complete program text of a new version.
+
+This example shows how to update a program with a bsdiff binary patch. Other patch formats
+may be applied by implementing the Patcher interface.
+
+	import (
+		"encoding/hex"
+		"io"
+
+		"github.com/inconshreveable/go-update"
+	)
+
+	func updateWithPatch(patch io.Reader) error {
+		err := update.Apply(patch, update.Options{
+			Patcher: update.NewBSDiffPatcher()
+		})
+		if err != nil {
+			// error handling
+		}
+		return err
+	}
+
+Checksum Verification
+
+Updating executable code on a computer can be a dangerous operation unless you
+take the appropriate steps to guarantee the authenticity of the new code. While
+checksum verification is important, it should always be combined with signature
+verification (next section) to guarantee that the code came from a trusted party.
+
+go-update validates SHA256 checksums by default, but this is pluggable via the Hash
+property on the Options struct.
+
+This example shows how to guarantee that the newly-updated binary is verified to
+have an appropriate checksum (that was otherwise retrived via a secure channel)
+specified as a hex string.
+
+	import (
+		"crypto"
+		_ "crypto/sha256"
+		"encoding/hex"
+		"io"
+
+		"github.com/inconshreveable/go-update"
+	)
+
+	func updateWithChecksum(binary io.Reader, hexChecksum string) error {
+		checksum, err := hex.DecodeString(hexChecksum)
+		if err != nil {
+			return err
+		}
+		err = update.Apply(binary, update.Options{
+			Hash: crypto.SHA256, 	// this is the default, you don't need to specify it
+			Checksum: checksum,
+		})
+		if err != nil {
+			// error handling
+		}
+		return err
+	}
+
+Cryptographic Signature Verification
+
+Cryptographic verification of new code from an update is an extremely important way to guarantee the
+security and integrity of your updates.
+
+Verification is performed by validating the signature of a hash of the new file. This
+means nothing changes if you apply your update with a patch.
+
+This example shows how to add signature verification to your updates. To make all of this work
+an application distributor must first create a public/private key pair and embed the public key
+into their application. When they issue a new release, the issuer must sign the new executable file
+with the private key and distribute the signature along with the update.
+
+	import (
+		"crypto"
+		_ "crypto/sha256"
+		"encoding/hex"
+		"io"
+
+		"github.com/inconshreveable/go-update"
+	)
+
+	var publicKey = []byte(`
+	-----BEGIN PUBLIC KEY-----
+	MFYwEAYHKoZIzj0CAQYFK4EEAAoDQgAEtrVmBxQvheRArXjg2vG1xIprWGuCyESx
+	MMY8pjmjepSy2kuz+nl9aFLqmr+rDNdYvEBqQaZrYMc6k29gjvoQnQ==
+	-----END PUBLIC KEY-----
+	`)
+
+	func verifiedUpdate(binary io.Reader, hexChecksum, hexSignature string) {
+		checksum, err := hex.DecodeString(hexChecksum)
+		if err != nil {
+			return err
+		}
+		signature, err := hex.DecodeString(hexSignature)
+		if err != nil {
+			return err
+		}
+		opts := update.Options{
+			Checksum: checksum,
+			Signature: signature,
+			Hash: crypto.SHA256, 	                 // this is the default, you don't need to specify it
+			Verifier: update.NewECDSAVerifier(),   // this is the default, you don't need to specify it
+		}
+		err = opts.SetPublicKeyPEM(publicKey)
+		if err != nil {
+			return err
+		}
+		err = update.Apply(binary, opts)
+		if err != nil {
+			// error handling
+		}
+		return err
+	}
+
+
+Building Single-File Go Binaries
+
+In order to update a Go application with go-update, you must distributed it as a single executable.
+This is often easy, but some applications require static assets (like HTML and CSS asset files or TLS certificates).
+In order to update applications like these, you'll want to make sure to embed those asset files into
+the distributed binary with a tool like go-bindata (my favorite): https://github.com/jteeuwen/go-bindata
+
+Non-Goals
+
+Mechanisms and protocols for determining whether an update should be applied and, if so, which one are
+out of scope for this package. Please consult go-tuf (https://github.com/flynn/go-tuf) or Equinox (https://equinox.io)
+for more complete solutions.
+
+go-update only works for self-updating applications that are distributed as a single binary, i.e.
+applications that do not have additional assets or dependency files.
+Updating application that are distributed as mutliple on-disk files is out of scope, although this
+may change in future versions of this library.
+
+*/
+package update

vendor/github.com/inconshreveable/go-update/hide_noop.go

@@ -0,0 +1,7 @@
+// +build !windows
+
+package update
+
+func hideFile(path string) error {
+	return nil
+}

vendor/github.com/inconshreveable/go-update/hide_windows.go

@@ -0,0 +1,19 @@
+package update
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+func hideFile(path string) error {
+	kernel32 := syscall.NewLazyDLL("kernel32.dll")
+	setFileAttributes := kernel32.NewProc("SetFileAttributesW")
+
+	r1, _, err := setFileAttributes.Call(uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(path))), 2)
+
+	if r1 == 0 {
+		return err
+	} else {
+		return nil
+	}
+}

vendor/github.com/inconshreveable/go-update/internal/binarydist/License

@@ -0,0 +1,22 @@
+Copyright 2012 Keith Rarick
+
+Permission is hereby granted, free of charge, to any person
+obtaining a copy of this software and associated documentation
+files (the "Software"), to deal in the Software without
+restriction, including without limitation the rights to use,
+copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.

vendor/github.com/inconshreveable/go-update/internal/binarydist/Readme.md

@@ -0,0 +1,7 @@
+# binarydist
+
+Package binarydist implements binary diff and patch as described on
+<http://www.daemonology.net/bsdiff/>. It reads and writes files
+compatible with the tools there.
+
+Documentation at <http://go.pkgdoc.org/github.com/kr/binarydist>.

vendor/github.com/inconshreveable/go-update/internal/binarydist/bzip2.go

@@ -0,0 +1,40 @@
+package binarydist
+
+import (
+	"io"
+	"os/exec"
+)
+
+type bzip2Writer struct {
+	c *exec.Cmd
+	w io.WriteCloser
+}
+
+func (w bzip2Writer) Write(b []byte) (int, error) {
+	return w.w.Write(b)
+}
+
+func (w bzip2Writer) Close() error {
+	if err := w.w.Close(); err != nil {
+		return err
+	}
+	return w.c.Wait()
+}
+
+// Package compress/bzip2 implements only decompression,
+// so we'll fake it by running bzip2 in another process.
+func newBzip2Writer(w io.Writer) (wc io.WriteCloser, err error) {
+	var bw bzip2Writer
+	bw.c = exec.Command("bzip2", "-c")
+	bw.c.Stdout = w
+
+	if bw.w, err = bw.c.StdinPipe(); err != nil {
+		return nil, err
+	}
+
+	if err = bw.c.Start(); err != nil {
+		return nil, err
+	}
+
+	return bw, nil
+}

vendor/github.com/inconshreveable/go-update/internal/binarydist/diff.go

@@ -0,0 +1,408 @@
+package binarydist
+
+import (
+	"bytes"
+	"encoding/binary"
+	"io"
+	"io/ioutil"
+)
+
+func swap(a []int, i, j int) { a[i], a[j] = a[j], a[i] }
+
+func split(I, V []int, start, length, h int) {
+	var i, j, k, x, jj, kk int
+
+	if length < 16 {
+		for k = start; k < start+length; k += j {
+			j = 1
+			x = V[I[k]+h]
+			for i = 1; k+i < start+length; i++ {
+				if V[I[k+i]+h] < x {
+					x = V[I[k+i]+h]
+					j = 0
+				}
+				if V[I[k+i]+h] == x {
+					swap(I, k+i, k+j)
+					j++
+				}
+			}
+			for i = 0; i < j; i++ {
+				V[I[k+i]] = k + j - 1
+			}
+			if j == 1 {
+				I[k] = -1
+			}
+		}
+		return
+	}
+
+	x = V[I[start+length/2]+h]
+	jj = 0
+	kk = 0
+	for i = start; i < start+length; i++ {
+		if V[I[i]+h] < x {
+			jj++
+		}
+		if V[I[i]+h] == x {
+			kk++
+		}
+	}
+	jj += start
+	kk += jj
+
+	i = start
+	j = 0
+	k = 0
+	for i < jj {
+		if V[I[i]+h] < x {
+			i++
+		} else if V[I[i]+h] == x {
+			swap(I, i, jj+j)
+			j++
+		} else {
+			swap(I, i, kk+k)
+			k++
+		}
+	}
+
+	for jj+j < kk {
+		if V[I[jj+j]+h] == x {
+			j++
+		} else {
+			swap(I, jj+j, kk+k)
+			k++
+		}
+	}
+
+	if jj > start {
+		split(I, V, start, jj-start, h)
+	}
+
+	for i = 0; i < kk-jj; i++ {
+		V[I[jj+i]] = kk - 1
+	}
+	if jj == kk-1 {
+		I[jj] = -1
+	}
+
+	if start+length > kk {
+		split(I, V, kk, start+length-kk, h)
+	}
+}
+
+func qsufsort(obuf []byte) []int {
+	var buckets [256]int
+	var i, h int
+	I := make([]int, len(obuf)+1)
+	V := make([]int, len(obuf)+1)
+
+	for _, c := range obuf {
+		buckets[c]++
+	}
+	for i = 1; i < 256; i++ {
+		buckets[i] += buckets[i-1]
+	}
+	copy(buckets[1:], buckets[:])
+	buckets[0] = 0
+
+	for i, c := range obuf {
+		buckets[c]++
+		I[buckets[c]] = i
+	}
+
+	I[0] = len(obuf)
+	for i, c := range obuf {
+		V[i] = buckets[c]
+	}
+
+	V[len(obuf)] = 0
+	for i = 1; i < 256; i++ {
+		if buckets[i] == buckets[i-1]+1 {
+			I[buckets[i]] = -1
+		}
+	}
+	I[0] = -1
+
+	for h = 1; I[0] != -(len(obuf) + 1); h += h {
+		var n int
+		for i = 0; i < len(obuf)+1; {
+			if I[i] < 0 {
+				n -= I[i]
+				i -= I[i]
+			} else {
+				if n != 0 {
+					I[i-n] = -n
+				}
+				n = V[I[i]] + 1 - i
+				split(I, V, i, n, h)
+				i += n
+				n = 0
+			}
+		}
+		if n != 0 {
+			I[i-n] = -n
+		}
+	}
+
+	for i = 0; i < len(obuf)+1; i++ {
+		I[V[i]] = i
+	}
+	return I
+}
+
+func matchlen(a, b []byte) (i int) {
+	for i < len(a) && i < len(b) && a[i] == b[i] {
+		i++
+	}
+	return i
+}
+
+func search(I []int, obuf, nbuf []byte, st, en int) (pos, n int) {
+	if en-st < 2 {
+		x := matchlen(obuf[I[st]:], nbuf)
+		y := matchlen(obuf[I[en]:], nbuf)
+
+		if x > y {
+			return I[st], x
+		} else {
+			return I[en], y
+		}
+	}
+
+	x := st + (en-st)/2
+	if bytes.Compare(obuf[I[x]:], nbuf) < 0 {
+		return search(I, obuf, nbuf, x, en)
+	} else {
+		return search(I, obuf, nbuf, st, x)
+	}
+	panic("unreached")
+}
+
+// Diff computes the difference between old and new, according to the bsdiff
+// algorithm, and writes the result to patch.
+func Diff(old, new io.Reader, patch io.Writer) error {
+	obuf, err := ioutil.ReadAll(old)
+	if err != nil {
+		return err
+	}
+
+	nbuf, err := ioutil.ReadAll(new)
+	if err != nil {
+		return err
+	}
+
+	pbuf, err := diffBytes(obuf, nbuf)
+	if err != nil {
+		return err
+	}
+
+	_, err = patch.Write(pbuf)
+	return err
+}
+
+func diffBytes(obuf, nbuf []byte) ([]byte, error) {
+	var patch seekBuffer
+	err := diff(obuf, nbuf, &patch)
+	if err != nil {
+		return nil, err
+	}
+	return patch.buf, nil
+}
+
+func diff(obuf, nbuf []byte, patch io.WriteSeeker) error {
+	var lenf int
+	I := qsufsort(obuf)
+	db := make([]byte, len(nbuf))
+	eb := make([]byte, len(nbuf))
+	var dblen, eblen int
+
+	var hdr header
+	hdr.Magic = magic
+	hdr.NewSize = int64(len(nbuf))
+	err := binary.Write(patch, signMagLittleEndian{}, &hdr)
+	if err != nil {
+		return err
+	}
+
+	// Compute the differences, writing ctrl as we go
+	pfbz2, err := newBzip2Writer(patch)
+	if err != nil {
+		return err
+	}
+	var scan, pos, length int
+	var lastscan, lastpos, lastoffset int
+	for scan < len(nbuf) {
+		var oldscore int
+		scan += length
+		for scsc := scan; scan < len(nbuf); scan++ {
+			pos, length = search(I, obuf, nbuf[scan:], 0, len(obuf))
+
+			for ; scsc < scan+length; scsc++ {
+				if scsc+lastoffset < len(obuf) &&
+					obuf[scsc+lastoffset] == nbuf[scsc] {
+					oldscore++
+				}
+			}
+
+			if (length == oldscore && length != 0) || length > oldscore+8 {
+				break
+			}
+
+			if scan+lastoffset < len(obuf) && obuf[scan+lastoffset] == nbuf[scan] {
+				oldscore--
+			}
+		}
+
+		if length != oldscore || scan == len(nbuf) {
+			var s, Sf int
+			lenf = 0
+			for i := 0; lastscan+i < scan && lastpos+i < len(obuf); {
+				if obuf[lastpos+i] == nbuf[lastscan+i] {
+					s++
+				}
+				i++
+				if s*2-i > Sf*2-lenf {
+					Sf = s
+					lenf = i
+				}
+			}
+
+			lenb := 0
+			if scan < len(nbuf) {
+				var s, Sb int
+				for i := 1; (scan >= lastscan+i) && (pos >= i); i++ {
+					if obuf[pos-i] == nbuf[scan-i] {
+						s++
+					}
+					if s*2-i > Sb*2-lenb {
+						Sb = s
+						lenb = i
+					}
+				}
+			}
+
+			if lastscan+lenf > scan-lenb {
+				overlap := (lastscan + lenf) - (scan - lenb)
+				s := 0
+				Ss := 0
+				lens := 0
+				for i := 0; i < overlap; i++ {
+					if nbuf[lastscan+lenf-overlap+i] == obuf[lastpos+lenf-overlap+i] {
+						s++
+					}
+					if nbuf[scan-lenb+i] == obuf[pos-lenb+i] {
+						s--
+					}
+					if s > Ss {
+						Ss = s
+						lens = i + 1
+					}
+				}
+
+				lenf += lens - overlap
+				lenb -= lens
+			}
+
+			for i := 0; i < lenf; i++ {
+				db[dblen+i] = nbuf[lastscan+i] - obuf[lastpos+i]
+			}
+			for i := 0; i < (scan-lenb)-(lastscan+lenf); i++ {
+				eb[eblen+i] = nbuf[lastscan+lenf+i]
+			}
+
+			dblen += lenf
+			eblen += (scan - lenb) - (lastscan + lenf)
+
+			err = binary.Write(pfbz2, signMagLittleEndian{}, int64(lenf))
+			if err != nil {
+				pfbz2.Close()
+				return err
+			}
+
+			val := (scan - lenb) - (lastscan + lenf)
+			err = binary.Write(pfbz2, signMagLittleEndian{}, int64(val))
+			if err != nil {
+				pfbz2.Close()
+				return err
+			}
+
+			val = (pos - lenb) - (lastpos + lenf)
+			err = binary.Write(pfbz2, signMagLittleEndian{}, int64(val))
+			if err != nil {
+				pfbz2.Close()
+				return err
+			}
+
+			lastscan = scan - lenb
+			lastpos = pos - lenb
+			lastoffset = pos - scan
+		}
+	}
+	err = pfbz2.Close()
+	if err != nil {
+		return err
+	}
+
+	// Compute size of compressed ctrl data
+	l64, err := patch.Seek(0, 1)
+	if err != nil {
+		return err
+	}
+	hdr.CtrlLen = int64(l64 - 32)
+
+	// Write compressed diff data
+	pfbz2, err = newBzip2Writer(patch)
+	if err != nil {
+		return err
+	}
+	n, err := pfbz2.Write(db[:dblen])
+	if err != nil {
+		pfbz2.Close()
+		return err
+	}
+	if n != dblen {
+		pfbz2.Close()
+		return io.ErrShortWrite
+	}
+	err = pfbz2.Close()
+	if err != nil {
+		return err
+	}
+
+	// Compute size of compressed diff data
+	n64, err := patch.Seek(0, 1)
+	if err != nil {
+		return err
+	}
+	hdr.DiffLen = n64 - l64
+
+	// Write compressed extra data
+	pfbz2, err = newBzip2Writer(patch)
+	if err != nil {
+		return err
+	}
+	n, err = pfbz2.Write(eb[:eblen])
+	if err != nil {
+		pfbz2.Close()
+		return err
+	}
+	if n != eblen {
+		pfbz2.Close()
+		return io.ErrShortWrite
+	}
+	err = pfbz2.Close()
+	if err != nil {
+		return err
+	}
+
+	// Seek to the beginning, write the header, and close the file
+	_, err = patch.Seek(0, 0)
+	if err != nil {
+		return err
+	}
+	err = binary.Write(patch, signMagLittleEndian{}, &hdr)
+	if err != nil {
+		return err
+	}
+	return nil
+}

vendor/github.com/inconshreveable/go-update/internal/binarydist/doc.go

@@ -0,0 +1,24 @@
+// Package binarydist implements binary diff and patch as described on
+// http://www.daemonology.net/bsdiff/. It reads and writes files
+// compatible with the tools there.
+package binarydist
+
+var magic = [8]byte{'B', 'S', 'D', 'I', 'F', 'F', '4', '0'}
+
+// File format:
+//   0       8    "BSDIFF40"
+//   8       8    X
+//   16      8    Y
+//   24      8    sizeof(newfile)
+//   32      X    bzip2(control block)
+//   32+X    Y    bzip2(diff block)
+//   32+X+Y  ???  bzip2(extra block)
+// with control block a set of triples (x,y,z) meaning "add x bytes
+// from oldfile to x bytes from the diff block; copy y bytes from the
+// extra block; seek forwards in oldfile by z bytes".
+type header struct {
+	Magic   [8]byte
+	CtrlLen int64
+	DiffLen int64
+	NewSize int64
+}

vendor/github.com/inconshreveable/go-update/internal/binarydist/encoding.go

@@ -0,0 +1,53 @@
+package binarydist
+
+// SignMagLittleEndian is the numeric encoding used by the bsdiff tools.
+// It implements binary.ByteOrder using a sign-magnitude format
+// and little-endian byte order. Only methods Uint64 and String
+// have been written; the rest panic.
+type signMagLittleEndian struct{}
+
+func (signMagLittleEndian) Uint16(b []byte) uint16 { panic("unimplemented") }
+
+func (signMagLittleEndian) PutUint16(b []byte, v uint16) { panic("unimplemented") }
+
+func (signMagLittleEndian) Uint32(b []byte) uint32 { panic("unimplemented") }
+
+func (signMagLittleEndian) PutUint32(b []byte, v uint32) { panic("unimplemented") }
+
+func (signMagLittleEndian) Uint64(b []byte) uint64 {
+	y := int64(b[0]) |
+		int64(b[1])<<8 |
+		int64(b[2])<<16 |
+		int64(b[3])<<24 |
+		int64(b[4])<<32 |
+		int64(b[5])<<40 |
+		int64(b[6])<<48 |
+		int64(b[7]&0x7f)<<56
+
+	if b[7]&0x80 != 0 {
+		y = -y
+	}
+	return uint64(y)
+}
+
+func (signMagLittleEndian) PutUint64(b []byte, v uint64) {
+	x := int64(v)
+	neg := x < 0
+	if neg {
+		x = -x
+	}
+
+	b[0] = byte(x)
+	b[1] = byte(x >> 8)
+	b[2] = byte(x >> 16)
+	b[3] = byte(x >> 24)
+	b[4] = byte(x >> 32)
+	b[5] = byte(x >> 40)
+	b[6] = byte(x >> 48)
+	b[7] = byte(x >> 56)
+	if neg {
+		b[7] |= 0x80
+	}
+}
+
+func (signMagLittleEndian) String() string { return "signMagLittleEndian" }

vendor/github.com/inconshreveable/go-update/internal/binarydist/patch.go

@@ -0,0 +1,109 @@
+package binarydist
+
+import (
+	"bytes"
+	"compress/bzip2"
+	"encoding/binary"
+	"errors"
+	"io"
+	"io/ioutil"
+)
+
+var ErrCorrupt = errors.New("corrupt patch")
+
+// Patch applies patch to old, according to the bspatch algorithm,
+// and writes the result to new.
+func Patch(old io.Reader, new io.Writer, patch io.Reader) error {
+	var hdr header
+	err := binary.Read(patch, signMagLittleEndian{}, &hdr)
+	if err != nil {
+		return err
+	}
+	if hdr.Magic != magic {
+		return ErrCorrupt
+	}
+	if hdr.CtrlLen < 0 || hdr.DiffLen < 0 || hdr.NewSize < 0 {
+		return ErrCorrupt
+	}
+
+	ctrlbuf := make([]byte, hdr.CtrlLen)
+	_, err = io.ReadFull(patch, ctrlbuf)
+	if err != nil {
+		return err
+	}
+	cpfbz2 := bzip2.NewReader(bytes.NewReader(ctrlbuf))
+
+	diffbuf := make([]byte, hdr.DiffLen)
+	_, err = io.ReadFull(patch, diffbuf)
+	if err != nil {
+		return err
+	}
+	dpfbz2 := bzip2.NewReader(bytes.NewReader(diffbuf))
+
+	// The entire rest of the file is the extra block.
+	epfbz2 := bzip2.NewReader(patch)
+
+	obuf, err := ioutil.ReadAll(old)
+	if err != nil {
+		return err
+	}
+
+	nbuf := make([]byte, hdr.NewSize)
+
+	var oldpos, newpos int64
+	for newpos < hdr.NewSize {
+		var ctrl struct{ Add, Copy, Seek int64 }
+		err = binary.Read(cpfbz2, signMagLittleEndian{}, &ctrl)
+		if err != nil {
+			return err
+		}
+
+		// Sanity-check
+		if newpos+ctrl.Add > hdr.NewSize {
+			return ErrCorrupt
+		}
+
+		// Read diff string
+		_, err = io.ReadFull(dpfbz2, nbuf[newpos:newpos+ctrl.Add])
+		if err != nil {
+			return ErrCorrupt
+		}
+
+		// Add old data to diff string
+		for i := int64(0); i < ctrl.Add; i++ {
+			if oldpos+i >= 0 && oldpos+i < int64(len(obuf)) {
+				nbuf[newpos+i] += obuf[oldpos+i]
+			}
+		}
+
+		// Adjust pointers
+		newpos += ctrl.Add
+		oldpos += ctrl.Add
+
+		// Sanity-check
+		if newpos+ctrl.Copy > hdr.NewSize {
+			return ErrCorrupt
+		}
+
+		// Read extra string
+		_, err = io.ReadFull(epfbz2, nbuf[newpos:newpos+ctrl.Copy])
+		if err != nil {
+			return ErrCorrupt
+		}
+
+		// Adjust pointers
+		newpos += ctrl.Copy
+		oldpos += ctrl.Seek
+	}
+
+	// Write the new file
+	for len(nbuf) > 0 {
+		n, err := new.Write(nbuf)
+		if err != nil {
+			return err
+		}
+		nbuf = nbuf[n:]
+	}
+
+	return nil
+}

vendor/github.com/inconshreveable/go-update/internal/binarydist/seek.go

@@ -0,0 +1,43 @@
+package binarydist
+
+import (
+	"errors"
+)
+
+type seekBuffer struct {
+	buf []byte
+	pos int
+}
+
+func (b *seekBuffer) Write(p []byte) (n int, err error) {
+	n = copy(b.buf[b.pos:], p)
+	if n == len(p) {
+		b.pos += n
+		return n, nil
+	}
+	b.buf = append(b.buf, p[n:]...)
+	b.pos += len(p)
+	return len(p), nil
+}
+
+func (b *seekBuffer) Seek(offset int64, whence int) (ret int64, err error) {
+	var abs int64
+	switch whence {
+	case 0:
+		abs = offset
+	case 1:
+		abs = int64(b.pos) + offset
+	case 2:
+		abs = int64(len(b.buf)) + offset
+	default:
+		return 0, errors.New("binarydist: invalid whence")
+	}
+	if abs < 0 {
+		return 0, errors.New("binarydist: negative position")
+	}
+	if abs >= 1<<31 {
+		return 0, errors.New("binarydist: position out of range")
+	}
+	b.pos = int(abs)
+	return abs, nil
+}

vendor/github.com/inconshreveable/go-update/internal/osext/LICENSE

@@ -0,0 +1,27 @@
+Copyright (c) 2012 The Go Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

vendor/github.com/inconshreveable/go-update/internal/osext/README.md

@@ -0,0 +1,16 @@
+### Extensions to the "os" package.
+
+## Find the current Executable and ExecutableFolder.
+
+There is sometimes utility in finding the current executable file
+that is running. This can be used for upgrading the current executable
+or finding resources located relative to the executable file. Both
+working directory and the os.Args[0] value are arbitrary and cannot
+be relied on; os.Args[0] can be "faked".
+
+Multi-platform and supports:
+ * Linux
+ * OS X
+ * Windows
+ * Plan 9
+ * BSDs.

vendor/github.com/inconshreveable/go-update/internal/osext/osext.go

@@ -0,0 +1,27 @@
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Extensions to the standard "os" package.
+package osext
+
+import "path/filepath"
+
+// Executable returns an absolute path that can be used to
+// re-invoke the current program.
+// It may not be valid after the current program exits.
+func Executable() (string, error) {
+	p, err := executable()
+	return filepath.Clean(p), err
+}
+
+// Returns same path as Executable, returns just the folder
+// path. Excludes the executable name and any trailing slash.
+func ExecutableFolder() (string, error) {
+	p, err := Executable()
+	if err != nil {
+		return "", err
+	}
+
+	return filepath.Dir(p), nil
+}

vendor/github.com/inconshreveable/go-update/internal/osext/osext_plan9.go

@@ -0,0 +1,20 @@
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package osext
+
+import (
+	"os"
+	"strconv"
+	"syscall"
+)
+
+func executable() (string, error) {
+	f, err := os.Open("/proc/" + strconv.Itoa(os.Getpid()) + "/text")
+	if err != nil {
+		return "", err
+	}
+	defer f.Close()
+	return syscall.Fd2path(int(f.Fd()))
+}

vendor/github.com/inconshreveable/go-update/internal/osext/osext_procfs.go

@@ -0,0 +1,36 @@
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build linux netbsd openbsd solaris dragonfly
+
+package osext
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"runtime"
+	"strings"
+)
+
+func executable() (string, error) {
+	switch runtime.GOOS {
+	case "linux":
+		const deletedTag = " (deleted)"
+		execpath, err := os.Readlink("/proc/self/exe")
+		if err != nil {
+			return execpath, err
+		}
+		execpath = strings.TrimSuffix(execpath, deletedTag)
+		execpath = strings.TrimPrefix(execpath, deletedTag)
+		return execpath, nil
+	case "netbsd":
+		return os.Readlink("/proc/curproc/exe")
+	case "openbsd", "dragonfly":
+		return os.Readlink("/proc/curproc/file")
+	case "solaris":
+		return os.Readlink(fmt.Sprintf("/proc/%d/path/a.out", os.Getpid()))
+	}
+	return "", errors.New("ExecPath not implemented for " + runtime.GOOS)
+}

vendor/github.com/inconshreveable/go-update/internal/osext/osext_sysctl.go

@@ -0,0 +1,79 @@
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build darwin freebsd
+
+package osext
+
+import (
+	"os"
+	"path/filepath"
+	"runtime"
+	"syscall"
+	"unsafe"
+)
+
+var initCwd, initCwdErr = os.Getwd()
+
+func executable() (string, error) {
+	var mib [4]int32
+	switch runtime.GOOS {
+	case "freebsd":
+		mib = [4]int32{1 /* CTL_KERN */, 14 /* KERN_PROC */, 12 /* KERN_PROC_PATHNAME */, -1}
+	case "darwin":
+		mib = [4]int32{1 /* CTL_KERN */, 38 /* KERN_PROCARGS */, int32(os.Getpid()), -1}
+	}
+
+	n := uintptr(0)
+	// Get length.
+	_, _, errNum := syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib[0])), 4, 0, uintptr(unsafe.Pointer(&n)), 0, 0)
+	if errNum != 0 {
+		return "", errNum
+	}
+	if n == 0 { // This shouldn't happen.
+		return "", nil
+	}
+	buf := make([]byte, n)
+	_, _, errNum = syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib[0])), 4, uintptr(unsafe.Pointer(&buf[0])), uintptr(unsafe.Pointer(&n)), 0, 0)
+	if errNum != 0 {
+		return "", errNum
+	}
+	if n == 0 { // This shouldn't happen.
+		return "", nil
+	}
+	for i, v := range buf {
+		if v == 0 {
+			buf = buf[:i]
+			break
+		}
+	}
+	var err error
+	execPath := string(buf)
+	// execPath will not be empty due to above checks.
+	// Try to get the absolute path if the execPath is not rooted.
+	if execPath[0] != '/' {
+		execPath, err = getAbs(execPath)
+		if err != nil {
+			return execPath, err
+		}
+	}
+	// For darwin KERN_PROCARGS may return the path to a symlink rather than the
+	// actual executable.
+	if runtime.GOOS == "darwin" {
+		if execPath, err = filepath.EvalSymlinks(execPath); err != nil {
+			return execPath, err
+		}
+	}
+	return execPath, nil
+}
+
+func getAbs(execPath string) (string, error) {
+	if initCwdErr != nil {
+		return execPath, initCwdErr
+	}
+	// The execPath may begin with a "../" or a "./" so clean it first.
+	// Join the two paths, trailing and starting slashes undetermined, so use
+	// the generic Join function.
+	return filepath.Join(initCwd, filepath.Clean(execPath)), nil
+}

vendor/github.com/inconshreveable/go-update/internal/osext/osext_windows.go

@@ -0,0 +1,34 @@
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package osext
+
+import (
+	"syscall"
+	"unicode/utf16"
+	"unsafe"
+)
+
+var (
+	kernel                = syscall.MustLoadDLL("kernel32.dll")
+	getModuleFileNameProc = kernel.MustFindProc("GetModuleFileNameW")
+)
+
+// GetModuleFileName() with hModule = NULL
+func executable() (exePath string, err error) {
+	return getModuleFileName()
+}
+
+func getModuleFileName() (string, error) {
+	var n uint32
+	b := make([]uint16, syscall.MAX_PATH)
+	size := uint32(len(b))
+
+	r0, _, e1 := getModuleFileNameProc.Call(0, uintptr(unsafe.Pointer(&b[0])), uintptr(size))
+	n = uint32(r0)
+	if n == 0 {
+		return "", e1
+	}
+	return string(utf16.Decode(b[0:n])), nil
+}

vendor/github.com/inconshreveable/go-update/patcher.go

@@ -0,0 +1,24 @@
+package update
+
+import (
+	"io"
+
+	"github.com/inconshreveable/go-update/internal/binarydist"
+)
+
+// Patcher defines an interface for applying binary patches to an old item to get an updated item.
+type Patcher interface {
+	Patch(old io.Reader, new io.Writer, patch io.Reader) error
+}
+
+type patchFn func(io.Reader, io.Writer, io.Reader) error
+
+func (fn patchFn) Patch(old io.Reader, new io.Writer, patch io.Reader) error {
+	return fn(old, new, patch)
+}
+
+// NewBSDifferPatcher returns a new Patcher that applies binary patches using
+// the bsdiff algorithm. See http://www.daemonology.net/bsdiff/
+func NewBSDiffPatcher() Patcher {
+	return patchFn(binarydist.Patch)
+}

vendor/github.com/inconshreveable/go-update/verifier.go

@@ -0,0 +1,74 @@
+package update
+
+import (
+	"crypto"
+	"crypto/dsa"
+	"crypto/ecdsa"
+	"crypto/rsa"
+	"encoding/asn1"
+	"errors"
+	"math/big"
+)
+
+// Verifier defines an interface for verfiying an update's signature with a public key.
+type Verifier interface {
+	VerifySignature(checksum, signature []byte, h crypto.Hash, publicKey crypto.PublicKey) error
+}
+
+type verifyFn func([]byte, []byte, crypto.Hash, crypto.PublicKey) error
+
+func (fn verifyFn) VerifySignature(checksum []byte, signature []byte, hash crypto.Hash, publicKey crypto.PublicKey) error {
+	return fn(checksum, signature, hash, publicKey)
+}
+
+// NewRSAVerifier returns a Verifier that uses the RSA algorithm to verify updates.
+func NewRSAVerifier() Verifier {
+	return verifyFn(func(checksum, signature []byte, hash crypto.Hash, publicKey crypto.PublicKey) error {
+		key, ok := publicKey.(*rsa.PublicKey)
+		if !ok {
+			return errors.New("not a valid RSA public key")
+		}
+		return rsa.VerifyPKCS1v15(key, hash, checksum, signature)
+	})
+}
+
+type rsDER struct {
+	R *big.Int
+	S *big.Int
+}
+
+// NewECDSAVerifier returns a Verifier that uses the ECDSA algorithm to verify updates.
+func NewECDSAVerifier() Verifier {
+	return verifyFn(func(checksum, signature []byte, hash crypto.Hash, publicKey crypto.PublicKey) error {
+		key, ok := publicKey.(*ecdsa.PublicKey)
+		if !ok {
+			return errors.New("not a valid ECDSA public key")
+		}
+		var rs rsDER
+		if _, err := asn1.Unmarshal(signature, &rs); err != nil {
+			return err
+		}
+		if !ecdsa.Verify(key, checksum, rs.R, rs.S) {
+			return errors.New("failed to verify ecsda signature")
+		}
+		return nil
+	})
+}
+
+// NewDSAVerifier returns a Verifier that uses the DSA algorithm to verify updates.
+func NewDSAVerifier() Verifier {
+	return verifyFn(func(checksum, signature []byte, hash crypto.Hash, publicKey crypto.PublicKey) error {
+		key, ok := publicKey.(*dsa.PublicKey)
+		if !ok {
+			return errors.New("not a valid DSA public key")
+		}
+		var rs rsDER
+		if _, err := asn1.Unmarshal(signature, &rs); err != nil {
+			return err
+		}
+		if !dsa.Verify(key, checksum, rs.R, rs.S) {
+			return errors.New("failed to verify ecsda signature")
+		}
+		return nil
+	})
+}

vendor/github.com/segmentio/go-prompt/History.md

@@ -0,0 +1,13 @@
+
+v1.2.0 / 2014-12-10
+===================
+
+  * remove appending of ? to Confirm()
+
+v1.1.0 / 2014-10-22
+==================
+
+ * add passwords example
+ * add password docs
+ * Merge pull request #2 from nrmitchi/add/gopass
+ * Adding convenience wrappers around howeyc/gopass

vendor/github.com/segmentio/go-prompt/Readme.md

@@ -0,0 +1,33 @@
+
+# go-prompt
+
+ Terminal prompts for Go.
+
+ View the [docs](http://godoc.org/pkg/github.com/segmentio/go-prompt).
+
+## Example
+
+```go
+package main
+
+import "github.com/segmentio/go-prompt"
+
+var langs = []string{
+  "c",
+  "c++",
+  "lua",
+  "go",
+  "js",
+  "ruby",
+  "python",
+}
+
+func main() {
+  i := prompt.Choose("What's your favorite language?", langs)
+  println("picked: " + langs[i])
+}
+```
+
+## License
+
+ MIT

vendor/github.com/segmentio/go-prompt/prompt.go

@@ -0,0 +1,94 @@
+package prompt
+
+import "github.com/howeyc/gopass"
+import "strings"
+import "strconv"
+import "fmt"
+
+// String prompt.
+func String(prompt string, args ...interface{}) string {
+	var s string
+	fmt.Printf(prompt+": ", args...)
+	fmt.Scanln(&s)
+	return s
+}
+
+// String prompt (required).
+func StringRequired(prompt string, args ...interface{}) (s string) {
+	for strings.Trim(s, " ") == "" {
+		s = String(prompt, args...)
+	}
+	return s
+}
+
+// Confirm continues prompting until the input is boolean-ish.
+func Confirm(prompt string, args ...interface{}) bool {
+	for {
+		switch String(prompt, args...) {
+		case "Yes", "yes", "y", "Y":
+			return true
+		case "No", "no", "n", "N":
+			return false
+		}
+	}
+}
+
+// Choose prompts for a single selection from `list`, returning in the index.
+func Choose(prompt string, list []string) int {
+	fmt.Println()
+	for i, val := range list {
+		fmt.Printf("  %d) %s\n", i+1, val)
+	}
+
+	fmt.Println()
+	i := -1
+
+	for {
+		s := String(prompt)
+
+		// index
+		n, err := strconv.Atoi(s)
+		if err == nil {
+			if n > 0 && n <= len(list) {
+				i = n - 1
+				break
+			} else {
+				continue
+			}
+		}
+
+		// value
+		i = indexOf(s, list)
+		if i != -1 {
+			break
+		}
+	}
+
+	return i
+}
+
+// Password prompt.
+func Password(prompt string, args ...interface{}) string {
+	fmt.Printf(prompt+": ", args...)
+	password, _ := gopass.GetPasswd()
+	s := string(password[0:])
+	return s
+}
+
+// Password prompt with mask.
+func PasswordMasked(prompt string, args ...interface{}) string {
+	fmt.Printf(prompt+": ", args...)
+	password, _ := gopass.GetPasswdMasked()
+	s := string(password[0:])
+	return s
+}
+
+// index of `s` in `list`.
+func indexOf(s string, list []string) int {
+	for i, val := range list {
+		if val == s {
+			return i
+		}
+	}
+	return -1
+}

vendor/golang.org/x/crypto/ssh/terminal/terminal.go

@@ -0,0 +1,951 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package terminal
+
+import (
+	"bytes"
+	"io"
+	"sync"
+	"unicode/utf8"
+)
+
+// EscapeCodes contains escape sequences that can be written to the terminal in
+// order to achieve different styles of text.
+type EscapeCodes struct {
+	// Foreground colors
+	Black, Red, Green, Yellow, Blue, Magenta, Cyan, White []byte
+
+	// Reset all attributes
+	Reset []byte
+}
+
+var vt100EscapeCodes = EscapeCodes{
+	Black:   []byte{keyEscape, '[', '3', '0', 'm'},
+	Red:     []byte{keyEscape, '[', '3', '1', 'm'},
+	Green:   []byte{keyEscape, '[', '3', '2', 'm'},
+	Yellow:  []byte{keyEscape, '[', '3', '3', 'm'},
+	Blue:    []byte{keyEscape, '[', '3', '4', 'm'},
+	Magenta: []byte{keyEscape, '[', '3', '5', 'm'},
+	Cyan:    []byte{keyEscape, '[', '3', '6', 'm'},
+	White:   []byte{keyEscape, '[', '3', '7', 'm'},
+
+	Reset: []byte{keyEscape, '[', '0', 'm'},
+}
+
+// Terminal contains the state for running a VT100 terminal that is capable of
+// reading lines of input.
+type Terminal struct {
+	// AutoCompleteCallback, if non-null, is called for each keypress with
+	// the full input line and the current position of the cursor (in
+	// bytes, as an index into |line|). If it returns ok=false, the key
+	// press is processed normally. Otherwise it returns a replacement line
+	// and the new cursor position.
+	AutoCompleteCallback func(line string, pos int, key rune) (newLine string, newPos int, ok bool)
+
+	// Escape contains a pointer to the escape codes for this terminal.
+	// It's always a valid pointer, although the escape codes themselves
+	// may be empty if the terminal doesn't support them.
+	Escape *EscapeCodes
+
+	// lock protects the terminal and the state in this object from
+	// concurrent processing of a key press and a Write() call.
+	lock sync.Mutex
+
+	c      io.ReadWriter
+	prompt []rune
+
+	// line is the current line being entered.
+	line []rune
+	// pos is the logical position of the cursor in line
+	pos int
+	// echo is true if local echo is enabled
+	echo bool
+	// pasteActive is true iff there is a bracketed paste operation in
+	// progress.
+	pasteActive bool
+
+	// cursorX contains the current X value of the cursor where the left
+	// edge is 0. cursorY contains the row number where the first row of
+	// the current line is 0.
+	cursorX, cursorY int
+	// maxLine is the greatest value of cursorY so far.
+	maxLine int
+
+	termWidth, termHeight int
+
+	// outBuf contains the terminal data to be sent.
+	outBuf []byte
+	// remainder contains the remainder of any partial key sequences after
+	// a read. It aliases into inBuf.
+	remainder []byte
+	inBuf     [256]byte
+
+	// history contains previously entered commands so that they can be
+	// accessed with the up and down keys.
+	history stRingBuffer
+	// historyIndex stores the currently accessed history entry, where zero
+	// means the immediately previous entry.
+	historyIndex int
+	// When navigating up and down the history it's possible to return to
+	// the incomplete, initial line. That value is stored in
+	// historyPending.
+	historyPending string
+}
+
+// NewTerminal runs a VT100 terminal on the given ReadWriter. If the ReadWriter is
+// a local terminal, that terminal must first have been put into raw mode.
+// prompt is a string that is written at the start of each input line (i.e.
+// "> ").
+func NewTerminal(c io.ReadWriter, prompt string) *Terminal {
+	return &Terminal{
+		Escape:       &vt100EscapeCodes,
+		c:            c,
+		prompt:       []rune(prompt),
+		termWidth:    80,
+		termHeight:   24,
+		echo:         true,
+		historyIndex: -1,
+	}
+}
+
+const (
+	keyCtrlD     = 4
+	keyCtrlU     = 21
+	keyEnter     = '\r'
+	keyEscape    = 27
+	keyBackspace = 127
+	keyUnknown   = 0xd800 /* UTF-16 surrogate area */ + iota
+	keyUp
+	keyDown
+	keyLeft
+	keyRight
+	keyAltLeft
+	keyAltRight
+	keyHome
+	keyEnd
+	keyDeleteWord
+	keyDeleteLine
+	keyClearScreen
+	keyPasteStart
+	keyPasteEnd
+)
+
+var (
+	crlf       = []byte{'\r', '\n'}
+	pasteStart = []byte{keyEscape, '[', '2', '0', '0', '~'}
+	pasteEnd   = []byte{keyEscape, '[', '2', '0', '1', '~'}
+)
+
+// bytesToKey tries to parse a key sequence from b. If successful, it returns
+// the key and the remainder of the input. Otherwise it returns utf8.RuneError.
+func bytesToKey(b []byte, pasteActive bool) (rune, []byte) {
+	if len(b) == 0 {
+		return utf8.RuneError, nil
+	}
+
+	if !pasteActive {
+		switch b[0] {
+		case 1: // ^A
+			return keyHome, b[1:]
+		case 5: // ^E
+			return keyEnd, b[1:]
+		case 8: // ^H
+			return keyBackspace, b[1:]
+		case 11: // ^K
+			return keyDeleteLine, b[1:]
+		case 12: // ^L
+			return keyClearScreen, b[1:]
+		case 23: // ^W
+			return keyDeleteWord, b[1:]
+		}
+	}
+
+	if b[0] != keyEscape {
+		if !utf8.FullRune(b) {
+			return utf8.RuneError, b
+		}
+		r, l := utf8.DecodeRune(b)
+		return r, b[l:]
+	}
+
+	if !pasteActive && len(b) >= 3 && b[0] == keyEscape && b[1] == '[' {
+		switch b[2] {
+		case 'A':
+			return keyUp, b[3:]
+		case 'B':
+			return keyDown, b[3:]
+		case 'C':
+			return keyRight, b[3:]
+		case 'D':
+			return keyLeft, b[3:]
+		case 'H':
+			return keyHome, b[3:]
+		case 'F':
+			return keyEnd, b[3:]
+		}
+	}
+
+	if !pasteActive && len(b) >= 6 && b[0] == keyEscape && b[1] == '[' && b[2] == '1' && b[3] == ';' && b[4] == '3' {
+		switch b[5] {
+		case 'C':
+			return keyAltRight, b[6:]
+		case 'D':
+			return keyAltLeft, b[6:]
+		}
+	}
+
+	if !pasteActive && len(b) >= 6 && bytes.Equal(b[:6], pasteStart) {
+		return keyPasteStart, b[6:]
+	}
+
+	if pasteActive && len(b) >= 6 && bytes.Equal(b[:6], pasteEnd) {
+		return keyPasteEnd, b[6:]
+	}
+
+	// If we get here then we have a key that we don't recognise, or a
+	// partial sequence. It's not clear how one should find the end of a
+	// sequence without knowing them all, but it seems that [a-zA-Z~] only
+	// appears at the end of a sequence.
+	for i, c := range b[0:] {
+		if c >= 'a' && c <= 'z' || c >= 'A' && c <= 'Z' || c == '~' {
+			return keyUnknown, b[i+1:]
+		}
+	}
+
+	return utf8.RuneError, b
+}
+
+// queue appends data to the end of t.outBuf
+func (t *Terminal) queue(data []rune) {
+	t.outBuf = append(t.outBuf, []byte(string(data))...)
+}
+
+var eraseUnderCursor = []rune{' ', keyEscape, '[', 'D'}
+var space = []rune{' '}
+
+func isPrintable(key rune) bool {
+	isInSurrogateArea := key >= 0xd800 && key <= 0xdbff
+	return key >= 32 && !isInSurrogateArea
+}
+
+// moveCursorToPos appends data to t.outBuf which will move the cursor to the
+// given, logical position in the text.
+func (t *Terminal) moveCursorToPos(pos int) {
+	if !t.echo {
+		return
+	}
+
+	x := visualLength(t.prompt) + pos
+	y := x / t.termWidth
+	x = x % t.termWidth
+
+	up := 0
+	if y < t.cursorY {
+		up = t.cursorY - y
+	}
+
+	down := 0
+	if y > t.cursorY {
+		down = y - t.cursorY
+	}
+
+	left := 0
+	if x < t.cursorX {
+		left = t.cursorX - x
+	}
+
+	right := 0
+	if x > t.cursorX {
+		right = x - t.cursorX
+	}
+
+	t.cursorX = x
+	t.cursorY = y
+	t.move(up, down, left, right)
+}
+
+func (t *Terminal) move(up, down, left, right int) {
+	movement := make([]rune, 3*(up+down+left+right))
+	m := movement
+	for i := 0; i < up; i++ {
+		m[0] = keyEscape
+		m[1] = '['
+		m[2] = 'A'
+		m = m[3:]
+	}
+	for i := 0; i < down; i++ {
+		m[0] = keyEscape
+		m[1] = '['
+		m[2] = 'B'
+		m = m[3:]
+	}
+	for i := 0; i < left; i++ {
+		m[0] = keyEscape
+		m[1] = '['
+		m[2] = 'D'
+		m = m[3:]
+	}
+	for i := 0; i < right; i++ {
+		m[0] = keyEscape
+		m[1] = '['
+		m[2] = 'C'
+		m = m[3:]
+	}
+
+	t.queue(movement)
+}
+
+func (t *Terminal) clearLineToRight() {
+	op := []rune{keyEscape, '[', 'K'}
+	t.queue(op)
+}
+
+const maxLineLength = 4096
+
+func (t *Terminal) setLine(newLine []rune, newPos int) {
+	if t.echo {
+		t.moveCursorToPos(0)
+		t.writeLine(newLine)
+		for i := len(newLine); i < len(t.line); i++ {
+			t.writeLine(space)
+		}
+		t.moveCursorToPos(newPos)
+	}
+	t.line = newLine
+	t.pos = newPos
+}
+
+func (t *Terminal) advanceCursor(places int) {
+	t.cursorX += places
+	t.cursorY += t.cursorX / t.termWidth
+	if t.cursorY > t.maxLine {
+		t.maxLine = t.cursorY
+	}
+	t.cursorX = t.cursorX % t.termWidth
+
+	if places > 0 && t.cursorX == 0 {
+		// Normally terminals will advance the current position
+		// when writing a character. But that doesn't happen
+		// for the last character in a line. However, when
+		// writing a character (except a new line) that causes
+		// a line wrap, the position will be advanced two
+		// places.
+		//
+		// So, if we are stopping at the end of a line, we
+		// need to write a newline so that our cursor can be
+		// advanced to the next line.
+		t.outBuf = append(t.outBuf, '\r', '\n')
+	}
+}
+
+func (t *Terminal) eraseNPreviousChars(n int) {
+	if n == 0 {
+		return
+	}
+
+	if t.pos < n {
+		n = t.pos
+	}
+	t.pos -= n
+	t.moveCursorToPos(t.pos)
+
+	copy(t.line[t.pos:], t.line[n+t.pos:])
+	t.line = t.line[:len(t.line)-n]
+	if t.echo {
+		t.writeLine(t.line[t.pos:])
+		for i := 0; i < n; i++ {
+			t.queue(space)
+		}
+		t.advanceCursor(n)
+		t.moveCursorToPos(t.pos)
+	}
+}
+
+// countToLeftWord returns then number of characters from the cursor to the
+// start of the previous word.
+func (t *Terminal) countToLeftWord() int {
+	if t.pos == 0 {
+		return 0
+	}
+
+	pos := t.pos - 1
+	for pos > 0 {
+		if t.line[pos] != ' ' {
+			break
+		}
+		pos--
+	}
+	for pos > 0 {
+		if t.line[pos] == ' ' {
+			pos++
+			break
+		}
+		pos--
+	}
+
+	return t.pos - pos
+}
+
+// countToRightWord returns then number of characters from the cursor to the
+// start of the next word.
+func (t *Terminal) countToRightWord() int {
+	pos := t.pos
+	for pos < len(t.line) {
+		if t.line[pos] == ' ' {
+			break
+		}
+		pos++
+	}
+	for pos < len(t.line) {
+		if t.line[pos] != ' ' {
+			break
+		}
+		pos++
+	}
+	return pos - t.pos
+}
+
+// visualLength returns the number of visible glyphs in s.
+func visualLength(runes []rune) int {
+	inEscapeSeq := false
+	length := 0
+
+	for _, r := range runes {
+		switch {
+		case inEscapeSeq:
+			if (r >= 'a' && r <= 'z') || (r >= 'A' && r <= 'Z') {
+				inEscapeSeq = false
+			}
+		case r == '\x1b':
+			inEscapeSeq = true
+		default:
+			length++
+		}
+	}
+
+	return length
+}
+
+// handleKey processes the given key and, optionally, returns a line of text
+// that the user has entered.
+func (t *Terminal) handleKey(key rune) (line string, ok bool) {
+	if t.pasteActive && key != keyEnter {
+		t.addKeyToLine(key)
+		return
+	}
+
+	switch key {
+	case keyBackspace:
+		if t.pos == 0 {
+			return
+		}
+		t.eraseNPreviousChars(1)
+	case keyAltLeft:
+		// move left by a word.
+		t.pos -= t.countToLeftWord()
+		t.moveCursorToPos(t.pos)
+	case keyAltRight:
+		// move right by a word.
+		t.pos += t.countToRightWord()
+		t.moveCursorToPos(t.pos)
+	case keyLeft:
+		if t.pos == 0 {
+			return
+		}
+		t.pos--
+		t.moveCursorToPos(t.pos)
+	case keyRight:
+		if t.pos == len(t.line) {
+			return
+		}
+		t.pos++
+		t.moveCursorToPos(t.pos)
+	case keyHome:
+		if t.pos == 0 {
+			return
+		}
+		t.pos = 0
+		t.moveCursorToPos(t.pos)
+	case keyEnd:
+		if t.pos == len(t.line) {
+			return
+		}
+		t.pos = len(t.line)
+		t.moveCursorToPos(t.pos)
+	case keyUp:
+		entry, ok := t.history.NthPreviousEntry(t.historyIndex + 1)
+		if !ok {
+			return "", false
+		}
+		if t.historyIndex == -1 {
+			t.historyPending = string(t.line)
+		}
+		t.historyIndex++
+		runes := []rune(entry)
+		t.setLine(runes, len(runes))
+	case keyDown:
+		switch t.historyIndex {
+		case -1:
+			return
+		case 0:
+			runes := []rune(t.historyPending)
+			t.setLine(runes, len(runes))
+			t.historyIndex--
+		default:
+			entry, ok := t.history.NthPreviousEntry(t.historyIndex - 1)
+			if ok {
+				t.historyIndex--
+				runes := []rune(entry)
+				t.setLine(runes, len(runes))
+			}
+		}
+	case keyEnter:
+		t.moveCursorToPos(len(t.line))
+		t.queue([]rune("\r\n"))
+		line = string(t.line)
+		ok = true
+		t.line = t.line[:0]
+		t.pos = 0
+		t.cursorX = 0
+		t.cursorY = 0
+		t.maxLine = 0
+	case keyDeleteWord:
+		// Delete zero or more spaces and then one or more characters.
+		t.eraseNPreviousChars(t.countToLeftWord())
+	case keyDeleteLine:
+		// Delete everything from the current cursor position to the
+		// end of line.
+		for i := t.pos; i < len(t.line); i++ {
+			t.queue(space)
+			t.advanceCursor(1)
+		}
+		t.line = t.line[:t.pos]
+		t.moveCursorToPos(t.pos)
+	case keyCtrlD:
+		// Erase the character under the current position.
+		// The EOF case when the line is empty is handled in
+		// readLine().
+		if t.pos < len(t.line) {
+			t.pos++
+			t.eraseNPreviousChars(1)
+		}
+	case keyCtrlU:
+		t.eraseNPreviousChars(t.pos)
+	case keyClearScreen:
+		// Erases the screen and moves the cursor to the home position.
+		t.queue([]rune("\x1b[2J\x1b[H"))
+		t.queue(t.prompt)
+		t.cursorX, t.cursorY = 0, 0
+		t.advanceCursor(visualLength(t.prompt))
+		t.setLine(t.line, t.pos)
+	default:
+		if t.AutoCompleteCallback != nil {
+			prefix := string(t.line[:t.pos])
+			suffix := string(t.line[t.pos:])
+
+			t.lock.Unlock()
+			newLine, newPos, completeOk := t.AutoCompleteCallback(prefix+suffix, len(prefix), key)
+			t.lock.Lock()
+
+			if completeOk {
+				t.setLine([]rune(newLine), utf8.RuneCount([]byte(newLine)[:newPos]))
+				return
+			}
+		}
+		if !isPrintable(key) {
+			return
+		}
+		if len(t.line) == maxLineLength {
+			return
+		}
+		t.addKeyToLine(key)
+	}
+	return
+}
+
+// addKeyToLine inserts the given key at the current position in the current
+// line.
+func (t *Terminal) addKeyToLine(key rune) {
+	if len(t.line) == cap(t.line) {
+		newLine := make([]rune, len(t.line), 2*(1+len(t.line)))
+		copy(newLine, t.line)
+		t.line = newLine
+	}
+	t.line = t.line[:len(t.line)+1]
+	copy(t.line[t.pos+1:], t.line[t.pos:])
+	t.line[t.pos] = key
+	if t.echo {
+		t.writeLine(t.line[t.pos:])
+	}
+	t.pos++
+	t.moveCursorToPos(t.pos)
+}
+
+func (t *Terminal) writeLine(line []rune) {
+	for len(line) != 0 {
+		remainingOnLine := t.termWidth - t.cursorX
+		todo := len(line)
+		if todo > remainingOnLine {
+			todo = remainingOnLine
+		}
+		t.queue(line[:todo])
+		t.advanceCursor(visualLength(line[:todo]))
+		line = line[todo:]
+	}
+}
+
+// writeWithCRLF writes buf to w but replaces all occurrences of \n with \r\n.
+func writeWithCRLF(w io.Writer, buf []byte) (n int, err error) {
+	for len(buf) > 0 {
+		i := bytes.IndexByte(buf, '\n')
+		todo := len(buf)
+		if i >= 0 {
+			todo = i
+		}
+
+		var nn int
+		nn, err = w.Write(buf[:todo])
+		n += nn
+		if err != nil {
+			return n, err
+		}
+		buf = buf[todo:]
+
+		if i >= 0 {
+			if _, err = w.Write(crlf); err != nil {
+				return n, err
+			}
+			n += 1
+			buf = buf[1:]
+		}
+	}
+
+	return n, nil
+}
+
+func (t *Terminal) Write(buf []byte) (n int, err error) {
+	t.lock.Lock()
+	defer t.lock.Unlock()
+
+	if t.cursorX == 0 && t.cursorY == 0 {
+		// This is the easy case: there's nothing on the screen that we
+		// have to move out of the way.
+		return writeWithCRLF(t.c, buf)
+	}
+
+	// We have a prompt and possibly user input on the screen. We
+	// have to clear it first.
+	t.move(0 /* up */, 0 /* down */, t.cursorX /* left */, 0 /* right */)
+	t.cursorX = 0
+	t.clearLineToRight()
+
+	for t.cursorY > 0 {
+		t.move(1 /* up */, 0, 0, 0)
+		t.cursorY--
+		t.clearLineToRight()
+	}
+
+	if _, err = t.c.Write(t.outBuf); err != nil {
+		return
+	}
+	t.outBuf = t.outBuf[:0]
+
+	if n, err = writeWithCRLF(t.c, buf); err != nil {
+		return
+	}
+
+	t.writeLine(t.prompt)
+	if t.echo {
+		t.writeLine(t.line)
+	}
+
+	t.moveCursorToPos(t.pos)
+
+	if _, err = t.c.Write(t.outBuf); err != nil {
+		return
+	}
+	t.outBuf = t.outBuf[:0]
+	return
+}
+
+// ReadPassword temporarily changes the prompt and reads a password, without
+// echo, from the terminal.
+func (t *Terminal) ReadPassword(prompt string) (line string, err error) {
+	t.lock.Lock()
+	defer t.lock.Unlock()
+
+	oldPrompt := t.prompt
+	t.prompt = []rune(prompt)
+	t.echo = false
+
+	line, err = t.readLine()
+
+	t.prompt = oldPrompt
+	t.echo = true
+
+	return
+}
+
+// ReadLine returns a line of input from the terminal.
+func (t *Terminal) ReadLine() (line string, err error) {
+	t.lock.Lock()
+	defer t.lock.Unlock()
+
+	return t.readLine()
+}
+
+func (t *Terminal) readLine() (line string, err error) {
+	// t.lock must be held at this point
+
+	if t.cursorX == 0 && t.cursorY == 0 {
+		t.writeLine(t.prompt)
+		t.c.Write(t.outBuf)
+		t.outBuf = t.outBuf[:0]
+	}
+
+	lineIsPasted := t.pasteActive
+
+	for {
+		rest := t.remainder
+		lineOk := false
+		for !lineOk {
+			var key rune
+			key, rest = bytesToKey(rest, t.pasteActive)
+			if key == utf8.RuneError {
+				break
+			}
+			if !t.pasteActive {
+				if key == keyCtrlD {
+					if len(t.line) == 0 {
+						return "", io.EOF
+					}
+				}
+				if key == keyPasteStart {
+					t.pasteActive = true
+					if len(t.line) == 0 {
+						lineIsPasted = true
+					}
+					continue
+				}
+			} else if key == keyPasteEnd {
+				t.pasteActive = false
+				continue
+			}
+			if !t.pasteActive {
+				lineIsPasted = false
+			}
+			line, lineOk = t.handleKey(key)
+		}
+		if len(rest) > 0 {
+			n := copy(t.inBuf[:], rest)
+			t.remainder = t.inBuf[:n]
+		} else {
+			t.remainder = nil
+		}
+		t.c.Write(t.outBuf)
+		t.outBuf = t.outBuf[:0]
+		if lineOk {
+			if t.echo {
+				t.historyIndex = -1
+				t.history.Add(line)
+			}
+			if lineIsPasted {
+				err = ErrPasteIndicator
+			}
+			return
+		}
+
+		// t.remainder is a slice at the beginning of t.inBuf
+		// containing a partial key sequence
+		readBuf := t.inBuf[len(t.remainder):]
+		var n int
+
+		t.lock.Unlock()
+		n, err = t.c.Read(readBuf)
+		t.lock.Lock()
+
+		if err != nil {
+			return
+		}
+
+		t.remainder = t.inBuf[:n+len(t.remainder)]
+	}
+}
+
+// SetPrompt sets the prompt to be used when reading subsequent lines.
+func (t *Terminal) SetPrompt(prompt string) {
+	t.lock.Lock()
+	defer t.lock.Unlock()
+
+	t.prompt = []rune(prompt)
+}
+
+func (t *Terminal) clearAndRepaintLinePlusNPrevious(numPrevLines int) {
+	// Move cursor to column zero at the start of the line.
+	t.move(t.cursorY, 0, t.cursorX, 0)
+	t.cursorX, t.cursorY = 0, 0
+	t.clearLineToRight()
+	for t.cursorY < numPrevLines {
+		// Move down a line
+		t.move(0, 1, 0, 0)
+		t.cursorY++
+		t.clearLineToRight()
+	}
+	// Move back to beginning.
+	t.move(t.cursorY, 0, 0, 0)
+	t.cursorX, t.cursorY = 0, 0
+
+	t.queue(t.prompt)
+	t.advanceCursor(visualLength(t.prompt))
+	t.writeLine(t.line)
+	t.moveCursorToPos(t.pos)
+}
+
+func (t *Terminal) SetSize(width, height int) error {
+	t.lock.Lock()
+	defer t.lock.Unlock()
+
+	if width == 0 {
+		width = 1
+	}
+
+	oldWidth := t.termWidth
+	t.termWidth, t.termHeight = width, height
+
+	switch {
+	case width == oldWidth:
+		// If the width didn't change then nothing else needs to be
+		// done.
+		return nil
+	case len(t.line) == 0 && t.cursorX == 0 && t.cursorY == 0:
+		// If there is nothing on current line and no prompt printed,
+		// just do nothing
+		return nil
+	case width < oldWidth:
+		// Some terminals (e.g. xterm) will truncate lines that were
+		// too long when shinking. Others, (e.g. gnome-terminal) will
+		// attempt to wrap them. For the former, repainting t.maxLine
+		// works great, but that behaviour goes badly wrong in the case
+		// of the latter because they have doubled every full line.
+
+		// We assume that we are working on a terminal that wraps lines
+		// and adjust the cursor position based on every previous line
+		// wrapping and turning into two. This causes the prompt on
+		// xterms to move upwards, which isn't great, but it avoids a
+		// huge mess with gnome-terminal.
+		if t.cursorX >= t.termWidth {
+			t.cursorX = t.termWidth - 1
+		}
+		t.cursorY *= 2
+		t.clearAndRepaintLinePlusNPrevious(t.maxLine * 2)
+	case width > oldWidth:
+		// If the terminal expands then our position calculations will
+		// be wrong in the future because we think the cursor is
+		// |t.pos| chars into the string, but there will be a gap at
+		// the end of any wrapped line.
+		//
+		// But the position will actually be correct until we move, so
+		// we can move back to the beginning and repaint everything.
+		t.clearAndRepaintLinePlusNPrevious(t.maxLine)
+	}
+
+	_, err := t.c.Write(t.outBuf)
+	t.outBuf = t.outBuf[:0]
+	return err
+}
+
+type pasteIndicatorError struct{}
+
+func (pasteIndicatorError) Error() string {
+	return "terminal: ErrPasteIndicator not correctly handled"
+}
+
+// ErrPasteIndicator may be returned from ReadLine as the error, in addition
+// to valid line data. It indicates that bracketed paste mode is enabled and
+// that the returned line consists only of pasted data. Programs may wish to
+// interpret pasted data more literally than typed data.
+var ErrPasteIndicator = pasteIndicatorError{}
+
+// SetBracketedPasteMode requests that the terminal bracket paste operations
+// with markers. Not all terminals support this but, if it is supported, then
+// enabling this mode will stop any autocomplete callback from running due to
+// pastes. Additionally, any lines that are completely pasted will be returned
+// from ReadLine with the error set to ErrPasteIndicator.
+func (t *Terminal) SetBracketedPasteMode(on bool) {
+	if on {
+		io.WriteString(t.c, "\x1b[?2004h")
+	} else {
+		io.WriteString(t.c, "\x1b[?2004l")
+	}
+}
+
+// stRingBuffer is a ring buffer of strings.
+type stRingBuffer struct {
+	// entries contains max elements.
+	entries []string
+	max     int
+	// head contains the index of the element most recently added to the ring.
+	head int
+	// size contains the number of elements in the ring.
+	size int
+}
+
+func (s *stRingBuffer) Add(a string) {
+	if s.entries == nil {
+		const defaultNumEntries = 100
+		s.entries = make([]string, defaultNumEntries)
+		s.max = defaultNumEntries
+	}
+
+	s.head = (s.head + 1) % s.max
+	s.entries[s.head] = a
+	if s.size < s.max {
+		s.size++
+	}
+}
+
+// NthPreviousEntry returns the value passed to the nth previous call to Add.
+// If n is zero then the immediately prior value is returned, if one, then the
+// next most recent, and so on. If such an element doesn't exist then ok is
+// false.
+func (s *stRingBuffer) NthPreviousEntry(n int) (value string, ok bool) {
+	if n >= s.size {
+		return "", false
+	}
+	index := s.head - n
+	if index < 0 {
+		index += s.max
+	}
+	return s.entries[index], true
+}
+
+// readPasswordLine reads from reader until it finds \n or io.EOF.
+// The slice returned does not include the \n.
+// readPasswordLine also ignores any \r it finds.
+func readPasswordLine(reader io.Reader) ([]byte, error) {
+	var buf [1]byte
+	var ret []byte
+
+	for {
+		n, err := reader.Read(buf[:])
+		if n > 0 {
+			switch buf[0] {
+			case '\n':
+				return ret, nil
+			case '\r':
+				// remove \r from passwords on Windows
+			default:
+				ret = append(ret, buf[0])
+			}
+			continue
+		}
+		if err != nil {
+			if err == io.EOF && len(ret) > 0 {
+				return ret, nil
+			}
+			return ret, err
+		}
+	}
+}

vendor/golang.org/x/crypto/ssh/terminal/util.go

@@ -0,0 +1,119 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build darwin dragonfly freebsd linux,!appengine netbsd openbsd
+
+// Package terminal provides support functions for dealing with terminals, as
+// commonly found on UNIX systems.
+//
+// Putting a terminal into raw mode is the most common requirement:
+//
+// 	oldState, err := terminal.MakeRaw(0)
+// 	if err != nil {
+// 	        panic(err)
+// 	}
+// 	defer terminal.Restore(0, oldState)
+package terminal // import "golang.org/x/crypto/ssh/terminal"
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+// State contains the state of a terminal.
+type State struct {
+	termios syscall.Termios
+}
+
+// IsTerminal returns true if the given file descriptor is a terminal.
+func IsTerminal(fd int) bool {
+	var termios syscall.Termios
+	_, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), ioctlReadTermios, uintptr(unsafe.Pointer(&termios)), 0, 0, 0)
+	return err == 0
+}
+
+// MakeRaw put the terminal connected to the given file descriptor into raw
+// mode and returns the previous state of the terminal so that it can be
+// restored.
+func MakeRaw(fd int) (*State, error) {
+	var oldState State
+	if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), ioctlReadTermios, uintptr(unsafe.Pointer(&oldState.termios)), 0, 0, 0); err != 0 {
+		return nil, err
+	}
+
+	newState := oldState.termios
+	// This attempts to replicate the behaviour documented for cfmakeraw in
+	// the termios(3) manpage.
+	newState.Iflag &^= syscall.IGNBRK | syscall.BRKINT | syscall.PARMRK | syscall.ISTRIP | syscall.INLCR | syscall.IGNCR | syscall.ICRNL | syscall.IXON
+	newState.Oflag &^= syscall.OPOST
+	newState.Lflag &^= syscall.ECHO | syscall.ECHONL | syscall.ICANON | syscall.ISIG | syscall.IEXTEN
+	newState.Cflag &^= syscall.CSIZE | syscall.PARENB
+	newState.Cflag |= syscall.CS8
+	if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), ioctlWriteTermios, uintptr(unsafe.Pointer(&newState)), 0, 0, 0); err != 0 {
+		return nil, err
+	}
+
+	return &oldState, nil
+}
+
+// GetState returns the current state of a terminal which may be useful to
+// restore the terminal after a signal.
+func GetState(fd int) (*State, error) {
+	var oldState State
+	if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), ioctlReadTermios, uintptr(unsafe.Pointer(&oldState.termios)), 0, 0, 0); err != 0 {
+		return nil, err
+	}
+
+	return &oldState, nil
+}
+
+// Restore restores the terminal connected to the given file descriptor to a
+// previous state.
+func Restore(fd int, state *State) error {
+	if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), ioctlWriteTermios, uintptr(unsafe.Pointer(&state.termios)), 0, 0, 0); err != 0 {
+		return err
+	}
+	return nil
+}
+
+// GetSize returns the dimensions of the given terminal.
+func GetSize(fd int) (width, height int, err error) {
+	var dimensions [4]uint16
+
+	if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), uintptr(syscall.TIOCGWINSZ), uintptr(unsafe.Pointer(&dimensions)), 0, 0, 0); err != 0 {
+		return -1, -1, err
+	}
+	return int(dimensions[1]), int(dimensions[0]), nil
+}
+
+// passwordReader is an io.Reader that reads from a specific file descriptor.
+type passwordReader int
+
+func (r passwordReader) Read(buf []byte) (int, error) {
+	return syscall.Read(int(r), buf)
+}
+
+// ReadPassword reads a line of input from a terminal without local echo.  This
+// is commonly used for inputting passwords and other sensitive data. The slice
+// returned does not include the \n.
+func ReadPassword(fd int) ([]byte, error) {
+	var oldState syscall.Termios
+	if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), ioctlReadTermios, uintptr(unsafe.Pointer(&oldState)), 0, 0, 0); err != 0 {
+		return nil, err
+	}
+
+	newState := oldState
+	newState.Lflag &^= syscall.ECHO
+	newState.Lflag |= syscall.ICANON | syscall.ISIG
+	newState.Iflag |= syscall.ICRNL
+	if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), ioctlWriteTermios, uintptr(unsafe.Pointer(&newState)), 0, 0, 0); err != 0 {
+		return nil, err
+	}
+
+	defer func() {
+		syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), ioctlWriteTermios, uintptr(unsafe.Pointer(&oldState)), 0, 0, 0)
+	}()
+
+	return readPasswordLine(passwordReader(fd))
+}

vendor/golang.org/x/crypto/ssh/terminal/util_bsd.go

@@ -0,0 +1,12 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build darwin dragonfly freebsd netbsd openbsd
+
+package terminal
+
+import "syscall"
+
+const ioctlReadTermios = syscall.TIOCGETA
+const ioctlWriteTermios = syscall.TIOCSETA

vendor/golang.org/x/crypto/ssh/terminal/util_linux.go

@@ -0,0 +1,11 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package terminal
+
+// These constants are declared here, rather than importing
+// them from the syscall package as some syscall packages, even
+// on linux, for example gccgo, do not declare them.
+const ioctlReadTermios = 0x5401  // syscall.TCGETS
+const ioctlWriteTermios = 0x5402 // syscall.TCSETS

vendor/golang.org/x/crypto/ssh/terminal/util_plan9.go

@@ -0,0 +1,58 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package terminal provides support functions for dealing with terminals, as
+// commonly found on UNIX systems.
+//
+// Putting a terminal into raw mode is the most common requirement:
+//
+// 	oldState, err := terminal.MakeRaw(0)
+// 	if err != nil {
+// 	        panic(err)
+// 	}
+// 	defer terminal.Restore(0, oldState)
+package terminal
+
+import (
+	"fmt"
+	"runtime"
+)
+
+type State struct{}
+
+// IsTerminal returns true if the given file descriptor is a terminal.
+func IsTerminal(fd int) bool {
+	return false
+}
+
+// MakeRaw put the terminal connected to the given file descriptor into raw
+// mode and returns the previous state of the terminal so that it can be
+// restored.
+func MakeRaw(fd int) (*State, error) {
+	return nil, fmt.Errorf("terminal: MakeRaw not implemented on %s/%s", runtime.GOOS, runtime.GOARCH)
+}
+
+// GetState returns the current state of a terminal which may be useful to
+// restore the terminal after a signal.
+func GetState(fd int) (*State, error) {
+	return nil, fmt.Errorf("terminal: GetState not implemented on %s/%s", runtime.GOOS, runtime.GOARCH)
+}
+
+// Restore restores the terminal connected to the given file descriptor to a
+// previous state.
+func Restore(fd int, state *State) error {
+	return fmt.Errorf("terminal: Restore not implemented on %s/%s", runtime.GOOS, runtime.GOARCH)
+}
+
+// GetSize returns the dimensions of the given terminal.
+func GetSize(fd int) (width, height int, err error) {
+	return 0, 0, fmt.Errorf("terminal: GetSize not implemented on %s/%s", runtime.GOOS, runtime.GOARCH)
+}
+
+// ReadPassword reads a line of input from a terminal without local echo.  This
+// is commonly used for inputting passwords and other sensitive data. The slice
+// returned does not include the \n.
+func ReadPassword(fd int) ([]byte, error) {
+	return nil, fmt.Errorf("terminal: ReadPassword not implemented on %s/%s", runtime.GOOS, runtime.GOARCH)
+}

vendor/golang.org/x/crypto/ssh/terminal/util_solaris.go

@@ -0,0 +1,128 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build solaris
+
+package terminal // import "golang.org/x/crypto/ssh/terminal"
+
+import (
+	"golang.org/x/sys/unix"
+	"io"
+	"syscall"
+)
+
+// State contains the state of a terminal.
+type State struct {
+	state *unix.Termios
+}
+
+// IsTerminal returns true if the given file descriptor is a terminal.
+func IsTerminal(fd int) bool {
+	_, err := unix.IoctlGetTermio(fd, unix.TCGETA)
+	return err == nil
+}
+
+// ReadPassword reads a line of input from a terminal without local echo.  This
+// is commonly used for inputting passwords and other sensitive data. The slice
+// returned does not include the \n.
+func ReadPassword(fd int) ([]byte, error) {
+	// see also: http://src.illumos.org/source/xref/illumos-gate/usr/src/lib/libast/common/uwin/getpass.c
+	val, err := unix.IoctlGetTermios(fd, unix.TCGETS)
+	if err != nil {
+		return nil, err
+	}
+	oldState := *val
+
+	newState := oldState
+	newState.Lflag &^= syscall.ECHO
+	newState.Lflag |= syscall.ICANON | syscall.ISIG
+	newState.Iflag |= syscall.ICRNL
+	err = unix.IoctlSetTermios(fd, unix.TCSETS, &newState)
+	if err != nil {
+		return nil, err
+	}
+
+	defer unix.IoctlSetTermios(fd, unix.TCSETS, &oldState)
+
+	var buf [16]byte
+	var ret []byte
+	for {
+		n, err := syscall.Read(fd, buf[:])
+		if err != nil {
+			return nil, err
+		}
+		if n == 0 {
+			if len(ret) == 0 {
+				return nil, io.EOF
+			}
+			break
+		}
+		if buf[n-1] == '\n' {
+			n--
+		}
+		ret = append(ret, buf[:n]...)
+		if n < len(buf) {
+			break
+		}
+	}
+
+	return ret, nil
+}
+
+// MakeRaw puts the terminal connected to the given file descriptor into raw
+// mode and returns the previous state of the terminal so that it can be
+// restored.
+// see http://cr.illumos.org/~webrev/andy_js/1060/
+func MakeRaw(fd int) (*State, error) {
+	oldTermiosPtr, err := unix.IoctlGetTermios(fd, unix.TCGETS)
+	if err != nil {
+		return nil, err
+	}
+	oldTermios := *oldTermiosPtr
+
+	newTermios := oldTermios
+	newTermios.Iflag &^= syscall.IGNBRK | syscall.BRKINT | syscall.PARMRK | syscall.ISTRIP | syscall.INLCR | syscall.IGNCR | syscall.ICRNL | syscall.IXON
+	newTermios.Oflag &^= syscall.OPOST
+	newTermios.Lflag &^= syscall.ECHO | syscall.ECHONL | syscall.ICANON | syscall.ISIG | syscall.IEXTEN
+	newTermios.Cflag &^= syscall.CSIZE | syscall.PARENB
+	newTermios.Cflag |= syscall.CS8
+	newTermios.Cc[unix.VMIN] = 1
+	newTermios.Cc[unix.VTIME] = 0
+
+	if err := unix.IoctlSetTermios(fd, unix.TCSETS, &newTermios); err != nil {
+		return nil, err
+	}
+
+	return &State{
+		state: oldTermiosPtr,
+	}, nil
+}
+
+// Restore restores the terminal connected to the given file descriptor to a
+// previous state.
+func Restore(fd int, oldState *State) error {
+	return unix.IoctlSetTermios(fd, unix.TCSETS, oldState.state)
+}
+
+// GetState returns the current state of a terminal which may be useful to
+// restore the terminal after a signal.
+func GetState(fd int) (*State, error) {
+	oldTermiosPtr, err := unix.IoctlGetTermios(fd, unix.TCGETS)
+	if err != nil {
+		return nil, err
+	}
+
+	return &State{
+		state: oldTermiosPtr,
+	}, nil
+}
+
+// GetSize returns the dimensions of the given terminal.
+func GetSize(fd int) (width, height int, err error) {
+	ws, err := unix.IoctlGetWinsize(fd, unix.TIOCGWINSZ)
+	if err != nil {
+		return 0, 0, err
+	}
+	return int(ws.Col), int(ws.Row), nil
+}

vendor/golang.org/x/crypto/ssh/terminal/util_windows.go

@@ -0,0 +1,155 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build windows
+
+// Package terminal provides support functions for dealing with terminals, as
+// commonly found on UNIX systems.
+//
+// Putting a terminal into raw mode is the most common requirement:
+//
+// 	oldState, err := terminal.MakeRaw(0)
+// 	if err != nil {
+// 	        panic(err)
+// 	}
+// 	defer terminal.Restore(0, oldState)
+package terminal
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+const (
+	enableLineInput       = 2
+	enableEchoInput       = 4
+	enableProcessedInput  = 1
+	enableWindowInput     = 8
+	enableMouseInput      = 16
+	enableInsertMode      = 32
+	enableQuickEditMode   = 64
+	enableExtendedFlags   = 128
+	enableAutoPosition    = 256
+	enableProcessedOutput = 1
+	enableWrapAtEolOutput = 2
+)
+
+var kernel32 = syscall.NewLazyDLL("kernel32.dll")
+
+var (
+	procGetConsoleMode             = kernel32.NewProc("GetConsoleMode")
+	procSetConsoleMode             = kernel32.NewProc("SetConsoleMode")
+	procGetConsoleScreenBufferInfo = kernel32.NewProc("GetConsoleScreenBufferInfo")
+)
+
+type (
+	short int16
+	word  uint16
+
+	coord struct {
+		x short
+		y short
+	}
+	smallRect struct {
+		left   short
+		top    short
+		right  short
+		bottom short
+	}
+	consoleScreenBufferInfo struct {
+		size              coord
+		cursorPosition    coord
+		attributes        word
+		window            smallRect
+		maximumWindowSize coord
+	}
+)
+
+type State struct {
+	mode uint32
+}
+
+// IsTerminal returns true if the given file descriptor is a terminal.
+func IsTerminal(fd int) bool {
+	var st uint32
+	r, _, e := syscall.Syscall(procGetConsoleMode.Addr(), 2, uintptr(fd), uintptr(unsafe.Pointer(&st)), 0)
+	return r != 0 && e == 0
+}
+
+// MakeRaw put the terminal connected to the given file descriptor into raw
+// mode and returns the previous state of the terminal so that it can be
+// restored.
+func MakeRaw(fd int) (*State, error) {
+	var st uint32
+	_, _, e := syscall.Syscall(procGetConsoleMode.Addr(), 2, uintptr(fd), uintptr(unsafe.Pointer(&st)), 0)
+	if e != 0 {
+		return nil, error(e)
+	}
+	raw := st &^ (enableEchoInput | enableProcessedInput | enableLineInput | enableProcessedOutput)
+	_, _, e = syscall.Syscall(procSetConsoleMode.Addr(), 2, uintptr(fd), uintptr(raw), 0)
+	if e != 0 {
+		return nil, error(e)
+	}
+	return &State{st}, nil
+}
+
+// GetState returns the current state of a terminal which may be useful to
+// restore the terminal after a signal.
+func GetState(fd int) (*State, error) {
+	var st uint32
+	_, _, e := syscall.Syscall(procGetConsoleMode.Addr(), 2, uintptr(fd), uintptr(unsafe.Pointer(&st)), 0)
+	if e != 0 {
+		return nil, error(e)
+	}
+	return &State{st}, nil
+}
+
+// Restore restores the terminal connected to the given file descriptor to a
+// previous state.
+func Restore(fd int, state *State) error {
+	_, _, err := syscall.Syscall(procSetConsoleMode.Addr(), 2, uintptr(fd), uintptr(state.mode), 0)
+	return err
+}
+
+// GetSize returns the dimensions of the given terminal.
+func GetSize(fd int) (width, height int, err error) {
+	var info consoleScreenBufferInfo
+	_, _, e := syscall.Syscall(procGetConsoleScreenBufferInfo.Addr(), 2, uintptr(fd), uintptr(unsafe.Pointer(&info)), 0)
+	if e != 0 {
+		return 0, 0, error(e)
+	}
+	return int(info.size.x), int(info.size.y), nil
+}
+
+// passwordReader is an io.Reader that reads from a specific Windows HANDLE.
+type passwordReader int
+
+func (r passwordReader) Read(buf []byte) (int, error) {
+	return syscall.Read(syscall.Handle(r), buf)
+}
+
+// ReadPassword reads a line of input from a terminal without local echo.  This
+// is commonly used for inputting passwords and other sensitive data. The slice
+// returned does not include the \n.
+func ReadPassword(fd int) ([]byte, error) {
+	var st uint32
+	_, _, e := syscall.Syscall(procGetConsoleMode.Addr(), 2, uintptr(fd), uintptr(unsafe.Pointer(&st)), 0)
+	if e != 0 {
+		return nil, error(e)
+	}
+	old := st
+
+	st &^= (enableEchoInput)
+	st |= (enableProcessedInput | enableLineInput | enableProcessedOutput)
+	_, _, e = syscall.Syscall(procSetConsoleMode.Addr(), 2, uintptr(fd), uintptr(st), 0)
+	if e != 0 {
+		return nil, error(e)
+	}
+
+	defer func() {
+		syscall.Syscall(procSetConsoleMode.Addr(), 2, uintptr(fd), uintptr(old), 0)
+	}()
+
+	return readPasswordLine(passwordReader(fd))
+}

vendor/vendor.json

@@ -255,6 +255,30 @@
 			"revision": "7e3c02b30806fa5779d3bdfc152ce4c6f40e7b38",
 			"revisionTime": "2016-01-19T13:13:26-08:00"
 		},
+		{
+			"checksumSHA1": "K6exl2ouL7d8cR2i378EzZOdRVI=",
+			"path": "github.com/howeyc/gopass",
+			"revision": "bf9dde6d0d2c004a008c27aaee91170c786f6db8",
+			"revisionTime": "2017-01-09T16:22:49Z"
+		},
+		{
+			"checksumSHA1": "YjZiQ5N552dJ7GpJ2P4TTRu4PKI=",
+			"path": "github.com/inconshreveable/go-update",
+			"revision": "8152e7eb6ccf8679a64582a66b78519688d156ad",
+			"revisionTime": "2016-01-12T19:33:35Z"
+		},
+		{
+			"checksumSHA1": "LeFW+ad/zlj30+Z0O4wwnXrVUSQ=",
+			"path": "github.com/inconshreveable/go-update/internal/binarydist",
+			"revision": "8152e7eb6ccf8679a64582a66b78519688d156ad",
+			"revisionTime": "2016-01-12T19:33:35Z"
+		},
+		{
+			"checksumSHA1": "H63+DW/S2nASpHk59G1wEUZD1qk=",
+			"path": "github.com/inconshreveable/go-update/internal/osext",
+			"revision": "8152e7eb6ccf8679a64582a66b78519688d156ad",
+			"revisionTime": "2016-01-12T19:33:35Z"
+		},
 		{
 			"path": "github.com/klauspost/cpuid",
 			"revision": "349c675778172472f5e8f3a3e0fe187e302e5a10",
@@ -462,7 +486,13 @@
 			"checksumSHA1": "iqUXcP3VA+G1/gVLRpQpBUt/BuA=",
 			"path": "github.com/satori/uuid",
 			"revision": "5bf94b69c6b68ee1b541973bb8e1144db23a194b",
-			"revisionTime": "2017-03-21T23:07:31Z"
+		        "revisionTime": "2017-03-21T23:07:31Z"
+                },
+                {
+			"checksumSHA1": "llmzhtIUy63V3Pl65RuEn18ck5g=",
+			"path": "github.com/segmentio/go-prompt",
+			"revision": "f0d19b6901ade831d5a3204edc0d6a7d6457fbb2",
+			"revisionTime": "2016-10-17T23:32:05Z"
 		},
 		{
 			"checksumSHA1": "u0hXGADM3JDza8YjgiyNJpAJk8g=",