build/vet: Fix all the shadowing reports with go1.6

Golang 1.6 is default version for the build now.

Additionally set 'GODEBUG=cgocheck=0' for now, until
we fix the erasure coding package.

Readmore here https://tip.golang.org/doc/go1.6#cgo

.gitignore

@@ -13,3 +13,4 @@ build
 isa-l
 vendor/**/*.js
 vendor/**/*.json
+release

.travis.yml

@@ -27,7 +27,7 @@ script:
 - make test GOFLAGS="-race"
 
 go:
-- 1.5.3
+- 1.6
 
 notifications:
   slack:

INSTALLGO.md

@@ -7,15 +7,15 @@ This installation document assumes Ubuntu 14.04+ on x86-64 platform.
 $ sudo apt-get install git build-essential
 ```
 
-##### Install Go 1.5+
+##### Install Go 1.6+
 
-Download Go 1.5+ from [https://golang.org/dl/](https://golang.org/dl/).
+Download Go 1.6+ from [https://golang.org/dl/](https://golang.org/dl/).
 
 ```sh
-$ wget https://storage.googleapis.com/golang/go1.5.1.linux-amd64.tar.gz
+$ wget https://storage.googleapis.com/golang/go1.6.linux-amd64.tar.gz
 $ mkdir -p ${HOME}/bin/
 $ mkdir -p ${HOME}/go/
-$ tar -C ${HOME}/bin/ -xzf go1.5.1.linux-amd64.tar.gz
+$ tar -C ${HOME}/bin/ -xzf go1.6.linux-amd64.tar.gz
 ```
 ##### Setup GOROOT and GOPATH
 
@@ -25,7 +25,7 @@ and GOPATH specifies the location of your project workspace.
 ```sh
 export GOROOT=${HOME}/bin/go
 export GOPATH=${HOME}/go
-export PATH=$PATH:${HOME}/bin/go/bin:${GOPATH}/bin
+export PATH=${HOME}/bin/go/bin:${GOPATH}/bin:$PATH
 ```
 ##### Source the new enviornment
 
@@ -71,7 +71,7 @@ and GOPATH specifies the location of your project workspace.
 export GOPATH=${HOME}/go
 export GOVERSION=$(brew list go | head -n 1 | cut -d '/' -f 6)
 export GOROOT=$(brew --prefix)/Cellar/go/${GOVERSION}/libexec
-export PATH=$PATH:${GOPATH}/bin
+export PATH=${GOPATH}/bin:$PATH
 ```
 ##### Source the new enviornment
 ```sh

Makefile

@@ -1,5 +1,7 @@
 LDFLAGS := $(shell go run buildscripts/gen-ldflags.go)
 DOCKER_BIN := $(shell which docker)
+PWD := $(shell pwd)
+GOPATH := $(shell go env GOPATH)
 DOCKER_LDFLAGS := '$(LDFLAGS) -extldflags "-static"'
 BUILD_LDFLAGS := '$(LDFLAGS)'
 TAG := latest
@@ -47,20 +49,16 @@ endif
 
 all: install
 
-checkdeps:
+checks:
 	@echo "Checking deps:"
 	@(env bash $(PWD)/buildscripts/checkdeps.sh)
-
+	@(env bash $(PWD)/buildscripts/checkgopath.sh)
-checkgopath:
-	@echo "Checking if project is at ${GOPATH}"
-	@for miniopath in $(echo ${GOPATH} | sed 's/:/\n/g'); do if [ ! -d ${miniopath}/src/github.com/minio/minio ]; then echo "Project not found in ${miniopath}, please follow instructions provided at https://github.com/minio/minio/blob/master/CONTRIBUTING.md#setup-your-minio-github-repository" && exit 1; fi done
-	@echo "Setting BUILD_LDFLAGS: ${BUILD_LDFLAGS}"
 
 checkdocker:
 	@echo "Checking if docker is installed.. "
 	@if [ -z ${DOCKER_BIN} ]; then echo "Docker not installed, cannot build docker image. Please install 'sudo apt-get install docker.io'" && exit 1; else echo "Docker installed at ${DOCKER_BIN}."; fi;
 
-getdeps: checkdeps checkgopath
+getdeps: checks
 	@go get -u github.com/golang/lint/golint && echo "Installed golint:"
 	@go get -u golang.org/x/tools/cmd/vet && echo "Installed vet:"
 	@go get -u github.com/fzipp/gocyclo && echo "Installed gocyclo:"
@@ -110,8 +108,8 @@ spelling:
 
 test: build
 	@echo "Running all minio testing:"
-	@CGO_CPPFLAGS="-I$(PWD)/isa-l" CGO_LDFLAGS="$(PWD)/isa-l/isa-l.a" GO15VENDOREXPERIMENT=1 go test $(GOFLAGS) .
+	@GODEBUG=cgocheck=0 CGO_CPPFLAGS="-I$(PWD)/isa-l" CGO_LDFLAGS="$(PWD)/isa-l/isa-l.a" GO15VENDOREXPERIMENT=1 go test $(GOFLAGS) .
-	@CGO_CPPFLAGS="-I$(PWD)/isa-l" CGO_LDFLAGS="$(PWD)/isa-l/isa-l.a" GO15VENDOREXPERIMENT=1 go test $(GOFLAGS) github.com/minio/minio/pkg...
+	@GODEBUG=cgocheck=0 CGO_CPPFLAGS="-I$(PWD)/isa-l" CGO_LDFLAGS="$(PWD)/isa-l/isa-l.a" GO15VENDOREXPERIMENT=1 go test $(GOFLAGS) github.com/minio/minio/pkg...
 
 gomake-all: build
 	@echo "Installing minio:"

appveyor.yml

@@ -10,12 +10,17 @@ environment:
   GOPATH: c:\gopath
   GO_EXTLINK_ENABLED: 0
   GO15VENDOREXPERIMENT: 1
+# Remove this after fixing erasure code.
+  GODEBUG: cgocheck=0
 
 # scripts that run after cloning repository
 install:
   - '"C:\Program Files\Microsoft SDKs\Windows\v7.1\Bin\SetEnv.cmd" /x64'
   - curl -fsSL -o c:\go\bin\yasm.exe http://www.tortall.net/projects/yasm/releases/yasm-1.3.0-win64.exe
   - set PATH=%GOPATH%\bin;c:\go\bin;%PATH%
+  - rd C:\Go /s /q
+  - appveyor DownloadFile https://storage.googleapis.com/golang/go1.6.windows-amd64.zip
+  - 7z x go1.6.windows-amd64.zip -oC:\ >nul
   - curl -fsSL -o mingw-w64.7z http://downloads.sourceforge.net/project/mingw-w64-dgn/mingw-w64/mingw-w64-bin-x86_64-20151206.7z
   - 7z x -oC:\ mingw-w64.7z > NUL
   - set PATH=C:\mingw64\bin;%PATH%

buildscripts/checkdeps.sh

@@ -22,8 +22,7 @@ _init() {
     ## Minimum required versions for build dependencies
     GIT_VERSION="1.0"
     YASM_VERSION="1.2.0"
-    CURL_VERSION="7.12.0"
+    GO_VERSION="1.6"
-    GO_VERSION="1.5.1"
     OSX_VERSION="10.8"
     UNAME=$(uname -sm)
 

buildscripts/checkgopath.sh

@@ -0,0 +1,40 @@
+#!/usr/bin/env bash
+#
+# Minio Cloud Storage, (C) 2015, 2016 Minio, Inc.
+#
+# 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.
+#
+
+_init() {
+
+    shopt -s extglob
+
+    PWD=$(pwd)
+    GOPATH=$(go env GOPATH)
+}
+
+main() {
+    echo "Checking if project is at ${GOPATH}"
+    for minio in $(echo ${GOPATH} | tr ':' ' '); do
+        if [ ! -d ${minio}/src/github.com/minio/minio ]; then
+            echo "Project not found in ${minio}, please follow instructions provided at https://github.com/minio/minio/blob/master/CONTRIBUTING.md#setup-your-minio-github-repository" \
+                && exit 1
+        fi
+        if [ "x${minio}/src/github.com/minio/minio" != "x${PWD}" ]; then
+            echo "Build outside of ${minio}, two source checkouts found. Exiting." && exit 1
+        fi
+    done
+}
+
+_init && main
+

globals.go

@@ -18,5 +18,5 @@ package main
 
 // Global constants for Minio.
 const (
-	minGoVersion = ">= 1.5.1" // Minio requires at least Go v1.5.1
+	minGoVersion = ">= 1.6" // Minio requires at least Go v1.6
 )

pkg/atomic/atomic.go

@@ -85,8 +85,8 @@ func FileCreateWithPrefix(filePath string, prefix string) (*File, error) {
 	if err != nil {
 		return nil, err
 	}
-	if err := os.Chmod(f.Name(), 0600); err != nil {
+	if err = os.Chmod(f.Name(), 0600); err != nil {
-		if err := os.Remove(f.Name()); err != nil {
+		if err = os.Remove(f.Name()); err != nil {
 			return nil, err
 		}
 		return nil, err

pkg/erasure/INSTALLGO.md

@@ -7,15 +7,15 @@ This installation document assumes Ubuntu 14.04+ on x86-64 platform.
 $ sudo apt-get install git build-essential yasm
 ```
 
-##### Install Go 1.5.1+
+##### Install Go 1.6+
 
-Download Go 1.5.1+ from [https://golang.org/dl/](https://golang.org/dl/).
+Download Go 1.6+ from [https://golang.org/dl/](https://golang.org/dl/).
 
 ```sh
-$ wget https://storage.googleapis.com/golang/go1.5.1.linux-amd64.tar.gz
+$ wget https://storage.googleapis.com/golang/go1.6.linux-amd64.tar.gz
 $ mkdir -p ${HOME}/bin/
 $ mkdir -p ${HOME}/go/
-$ tar -C ${HOME}/bin/ -xzf go1.5.1.linux-amd64.tar.gz
+$ tar -C ${HOME}/bin/ -xzf go1.6.linux-amd64.tar.gz
 ```
 ##### Setup GOROOT and GOPATH
 
@@ -25,7 +25,7 @@ and GOPATH specifies the location of your project workspace.
 ```sh
 $ export GOROOT=${HOME}/bin/go
 $ export GOPATH=${HOME}/go
-$ export PATH=$PATH:${HOME}/bin/go/bin:${GOPATH}/bin
+$ export PATH=${HOME}/bin/go/bin:${GOPATH}/bin:$PATH
 ```
 
 ## OS X (Yosemite) 10.10
@@ -42,7 +42,7 @@ $ ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/maste
 $ brew install git python yasm
 ```
 
-##### Install Go 1.5.1+
+##### Install Go 1.6+
 
 Install golang binaries using `brew`
 
@@ -60,5 +60,5 @@ and GOPATH specifies the location of your project workspace.
 $ export GOPATH=${HOME}/go
 $ export GOVERSION=$(brew list go | head -n 1 | cut -d '/' -f 6)
 $ export GOROOT=$(brew --prefix)/Cellar/go/${GOVERSION}/libexec
-$ export PATH=$PATH:${GOPATH}/bin
+$ export PATH=${GOPATH}/bin:$PATH
 ```

pkg/fs/fs.go

@@ -72,7 +72,7 @@ func New(rootPath string, minFreeDisk int64) (Filesystem, *probe.Error) {
 				Version:       "1",
 				ActiveSession: make(map[string]*MultipartSession),
 			}
-			if err := saveMultipartsSession(*multiparts); err != nil {
+			if err = saveMultipartsSession(*multiparts); err != nil {
 				return Filesystem{}, err.Trace()
 			}
 		} else {
@@ -88,7 +88,7 @@ func New(rootPath string, minFreeDisk int64) (Filesystem, *probe.Error) {
 				Version:  "1",
 				Metadata: make(map[string]*BucketMetadata),
 			}
-			if err := saveBucketsMetadata(*buckets); err != nil {
+			if err = saveBucketsMetadata(*buckets); err != nil {
 				return Filesystem{}, err.Trace()
 			}
 		} else {

pkg/ioutils/filepath.go

@@ -126,7 +126,7 @@ func walk(path string, info os.FileInfo, walkFn FTWFunc) error {
 	for _, fileInfo := range fis {
 		filename := filepath.Join(path, fileInfo.Name())
 		if err != nil {
-			if err := walkFn(filename, fileInfo, err); err != nil && err != ErrSkipDir && err != ErrSkipFile {
+			if err = walkFn(filename, fileInfo, err); err != nil && err != ErrSkipDir && err != ErrSkipFile {
 				return err
 			}
 		} else {

pkg/xl/cache/data/data.go

@@ -135,7 +135,7 @@ func (r *Cache) Append(key interface{}, value []byte) bool {
 	}
 	ele, hit := r.reverseItems[key]
 	if !hit {
-		ele := r.items.PushFront(&element{key, value})
+		ele = r.items.PushFront(&element{key, value})
 		r.currentSize += valueLen
 		r.reverseItems[key] = ele
 		return true