Add disk package

Implements

   - Stat returns total and free disk space supported across platforms
   - Type returns type of the filesystem underneath

pkg/disk/disk_test.go

@@ -0,0 +1,41 @@
+/*
+ * Minio Cloud Storage, (C) 2015 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.
+ */
+
+package disk_test
+
+import (
+	"io/ioutil"
+	"os"
+	"testing"
+
+	"github.com/minio/minio/pkg/disk"
+
+	. "gopkg.in/check.v1"
+)
+
+func Test(t *testing.T) { TestingT(t) }
+
+type MySuite struct{}
+
+var _ = Suite(&MySuite{})
+
+func (s *MySuite) TestFree(c *C) {
+	path, err := ioutil.TempDir(os.TempDir(), "minio-")
+	c.Check(err, IsNil)
+
+	_, _, err = disk.Stat(path)
+	c.Check(err, IsNil)
+}

pkg/disk/stat_nix.go

@@ -0,0 +1,35 @@
+// +build darwin dragonfly freebsd linux netbsd openbsd
+
+/*
+ * Minio Cloud Storage, (C) 2015 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.
+ */
+
+package disk
+
+import (
+	"syscall"
+)
+
+// Stat returns total and free bytes available in a directory, e.g. `/`.
+func Stat(path string) (total, free int64, err error) {
+	s := syscall.Statfs_t{}
+	err = syscall.Statfs(path, &s)
+	if err != nil {
+		return
+	}
+	total = int64(s.Bsize) * int64(s.Blocks)
+	free = int64(s.Bsize) * int64(s.Bfree)
+	return
+}

pkg/disk/stat_windows.go

@@ -0,0 +1,69 @@
+// +build windows
+
+/*
+ * Minio Cloud Storage, (C) 2015 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.
+ */
+
+package disk
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+// Stat returns total and free bytes available in a directory, e.g. `C:\`.
+// It returns free space available to the user (including quota limitations)
+//
+// https://msdn.microsoft.com/en-us/library/windows/desktop/aa364937(v=vs.85).aspx
+func Stat(path string) (total, free int64, err error) {
+	kernel32, err := syscall.LoadLibrary("Kernel32.dll")
+	if err != nil {
+		return 0, 0, err
+	}
+	defer syscall.FreeLibrary(kernel32)
+	// https://msdn.microsoft.com/en-us/library/windows/desktop/aa364937(v=vs.85).aspx
+	// Retrieves information about the amount of space that is available on a disk volume,
+	// which is the total amount of space, the total amount of free space, and the total
+	// amount of free space available to the user that is associated with the calling thread.
+	GetDiskFreeSpaceEx, err := syscall.GetProcAddress(syscall.Handle(kernel32), "GetDiskFreeSpaceExW")
+	if err != nil {
+		return 0, 0, err
+	}
+	lpFreeBytesAvailable := int64(0)
+	lpTotalNumberOfBytes := int64(0)
+	lpTotalNumberOfFreeBytes := int64(0)
+
+	// Extract values safely
+	// BOOL WINAPI GetDiskFreeSpaceEx(
+	// _In_opt_  LPCTSTR         lpDirectoryName,
+	// _Out_opt_ PULARGE_INTEGER lpFreeBytesAvailable,
+	// _Out_opt_ PULARGE_INTEGER lpTotalNumberOfBytes,
+	// _Out_opt_ PULARGE_INTEGER lpTotalNumberOfFreeBytes
+	// );
+	r1, _, e1 := syscall.Syscall6(uintptr(GetDiskFreeSpaceEx), 4,
+		uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(path))),
+		uintptr(unsafe.Pointer(&lpFreeBytesAvailable)),
+		uintptr(unsafe.Pointer(&lpTotalNumberOfBytes)),
+		uintptr(unsafe.Pointer(&lpTotalNumberOfFreeBytes)), 0, 0)
+	if e1 != 0 {
+		return 0, 0, error(e1)
+	}
+	if r1 == 0 {
+		return 0, 0, syscall.EINVAL
+	}
+	total = int64(lpTotalNumberOfBytes)
+	free = int64(lpFreeBytesAvailable)
+	return total, free, nil
+}

pkg/disk/type_darwin.go

@@ -0,0 +1,49 @@
+// +build darwin
+
+/*
+ * Minio Cloud Storage, (C) 2015 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.
+ */
+
+package disk
+
+import (
+	"strconv"
+	"syscall"
+)
+
+// fsType2StrinMap - list of filesystems supported by donut
+var fsType2StringMap = map[string]string{
+	"11": "HFS",
+}
+
+// FSType returns the filesystem type of the underlying mounted filesystem
+func FSType(path string) (string, error) {
+	s := syscall.Statfs_t{}
+	err := syscall.Statfs(path, &s)
+	if err != nil {
+		return "", err
+	}
+	return getFSType(s.Type), nil
+}
+
+// getFSType - get filesystem type
+func getFSType(fsType uint32) string {
+	fsTypeHex := strconv.FormatUint(uint64(fsType), 16)
+	fsTypeString, ok := fsType2StringMap[fsTypeHex]
+	if ok == false {
+		return "UNKNOWN"
+	}
+	return fsTypeString
+}

pkg/disk/type_linux.go

@@ -0,0 +1,60 @@
+// +build linux
+
+/*
+ * Minio Cloud Storage, (C) 2015 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.
+ */
+
+package disk
+
+import (
+	"strconv"
+	"syscall"
+)
+
+// fsType2StringMap - list of filesystems supported by donut on linux
+var fsType2StringMap = map[string]string{
+	"1021994":  "TMPFS",
+	"137d":     "EXT",
+	"4244":     "HFS",
+	"4d44":     "MSDOS",
+	"52654973": "REISERFS",
+	"5346544e": "NTFS",
+	"58465342": "XFS",
+	"61756673": "AUFS",
+	"6969":     "NFS",
+	"ef51":     "EXT2OLD",
+	"ef53":     "EXT4",
+	"f15f":     "ecryptfs",
+}
+
+// FSType returns the filesystem type of the underlying mounted filesystem
+func FSType(path string) (string, error) {
+	s := syscall.Statfs_t{}
+	err := syscall.Statfs(path, &s)
+	if err != nil {
+		return "", err
+	}
+	return getFSType(s.Type), nil
+}
+
+// getFSType - get filesystem type
+func getFSType(fsType int64) string {
+	fsTypeHex := strconv.FormatInt(fsType, 16)
+	fsTypeString, ok := fsType2StringMap[fsTypeHex]
+	if ok == false {
+		return "UNKNOWN"
+	}
+	return fsTypeString
+}