Make utils_daemon and volumes cross-platform compileable.

Signed-off-by: Rik Nijessen <riknijessen@gmail.com>

daemon/volumes.go

@@ -8,12 +8,12 @@ import (
 	"path/filepath"
 	"sort"
 	"strings"
-	"syscall"
 
 	log "github.com/Sirupsen/logrus"
 	"github.com/docker/docker/daemon/execdriver"
 	"github.com/docker/docker/pkg/chrootarchive"
 	"github.com/docker/docker/pkg/symlink"
+	"github.com/docker/docker/pkg/system"
 	"github.com/docker/docker/volumes"
 )
 
@@ -385,15 +385,14 @@ func copyExistingContents(source, destination string) error {
 // copyOwnership copies the permissions and uid:gid of the source file
 // into the destination file
 func copyOwnership(source, destination string) error {
-	var stat syscall.Stat_t
-
-	if err := syscall.Stat(source, &stat); err != nil {
+	stat, err := system.Stat(source)
+	if err != nil {
 		return err
 	}
 
-	if err := os.Chown(destination, int(stat.Uid), int(stat.Gid)); err != nil {
+	if err := os.Chown(destination, int(stat.Uid()), int(stat.Gid())); err != nil {
 		return err
 	}
 
-	return os.Chmod(destination, os.FileMode(stat.Mode))
+	return os.Chmod(destination, os.FileMode(stat.Mode()))
 }

pkg/archive/changes.go

@@ -143,7 +143,7 @@ func Changes(layers []string, rw string) ([]Change, error) {
 type FileInfo struct {
 	parent     *FileInfo
 	name       string
-	stat       *system.Stat
+	stat       *system.Stat_t
 	children   map[string]*FileInfo
 	capability []byte
 	added      bool

pkg/system/lstat.go

@@ -6,7 +6,7 @@ import (
 	"syscall"
 )
 
-func Lstat(path string) (*Stat, error) {
+func Lstat(path string) (*Stat_t, error) {
 	s := &syscall.Stat_t{}
 	err := syscall.Lstat(path, s)
 	if err != nil {

pkg/system/lstat_windows.go

@@ -2,7 +2,7 @@
 
 package system
 
-func Lstat(path string) (*Stat, error) {
+func Lstat(path string) (*Stat_t, error) {
 	// should not be called on cli code path
 	return nil, ErrNotSupportedPlatform
 }

pkg/system/stat.go

@@ -4,7 +4,7 @@ import (
 	"syscall"
 )
 
-type Stat struct {
+type Stat_t struct {
 	mode uint32
 	uid  uint32
 	gid  uint32
@@ -13,30 +13,30 @@ type Stat struct {
 	mtim syscall.Timespec
 }
 
-func (s Stat) Mode() uint32 {
+func (s Stat_t) Mode() uint32 {
 	return s.mode
 }
 
-func (s Stat) Uid() uint32 {
+func (s Stat_t) Uid() uint32 {
 	return s.uid
 }
 
-func (s Stat) Gid() uint32 {
+func (s Stat_t) Gid() uint32 {
 	return s.gid
 }
 
-func (s Stat) Rdev() uint64 {
+func (s Stat_t) Rdev() uint64 {
 	return s.rdev
 }
 
-func (s Stat) Size() int64 {
+func (s Stat_t) Size() int64 {
 	return s.size
 }
 
-func (s Stat) Mtim() syscall.Timespec {
+func (s Stat_t) Mtim() syscall.Timespec {
 	return s.mtim
 }
 
-func (s Stat) GetLastModification() syscall.Timespec {
+func (s Stat_t) GetLastModification() syscall.Timespec {
 	return s.Mtim()
 }

pkg/system/stat_linux.go

@@ -4,11 +4,20 @@ import (
 	"syscall"
 )
 
-func fromStatT(s *syscall.Stat_t) (*Stat, error) {
-	return &Stat{size: s.Size,
+func fromStatT(s *syscall.Stat_t) (*Stat_t, error) {
+	return &Stat_t{size: s.Size,
 		mode: s.Mode,
 		uid:  s.Uid,
 		gid:  s.Gid,
 		rdev: s.Rdev,
 		mtim: s.Mtim}, nil
 }
+
+func Stat(path string) (*Stat_t, error) {
+	s := &syscall.Stat_t{}
+	err := syscall.Stat(path, s)
+	if err != nil {
+		return nil, err
+	}
+	return fromStatT(s)
+}

pkg/system/stat_unsupported.go

@@ -6,8 +6,8 @@ import (
 	"syscall"
 )
 
-func fromStatT(s *syscall.Stat_t) (*Stat, error) {
-	return &Stat{size: s.Size,
+func fromStatT(s *syscall.Stat_t) (*Stat_t, error) {
+	return &Stat_t{size: s.Size,
 		mode: uint32(s.Mode),
 		uid:  s.Uid,
 		gid:  s.Gid,

pkg/system/stat_windows.go

@@ -7,6 +7,11 @@ import (
 	"syscall"
 )
 
-func fromStatT(s *syscall.Win32FileAttributeData) (*Stat, error) {
+func fromStatT(s *syscall.Win32FileAttributeData) (*Stat_t, error) {
 	return nil, errors.New("fromStatT should not be called on windows path")
 }
+
+func Stat(path string) (*Stat_t, error) {
+	// should not be called on cli code path
+	return nil, ErrNotSupportedPlatform
+}

utils/utils_daemon.go

@@ -3,14 +3,14 @@
 package utils
 
 import (
+	"github.com/docker/docker/pkg/system"
 	"os"
-	"syscall"
 )
 
 // IsFileOwner checks whether the current user is the owner of the given file.
 func IsFileOwner(f string) bool {
-	if fileInfo, err := os.Stat(f); err == nil && fileInfo != nil {
-		if stat, ok := fileInfo.Sys().(*syscall.Stat_t); ok && int(stat.Uid) == os.Getuid() {
+	if fileInfo, err := system.Stat(f); err == nil && fileInfo != nil {
+		if int(fileInfo.Uid()) == os.Getuid() {
 			return true
 		}
 	}

utils/utils_daemon_test.go

@@ -0,0 +1,26 @@
+package utils
+
+import (
+	"os"
+	"path"
+	"testing"
+)
+
+func TestIsFileOwner(t *testing.T) {
+	var err error
+	var file *os.File
+
+	if file, err = os.Create(path.Join(os.TempDir(), "testIsFileOwner")); err != nil {
+		t.Fatalf("failed to create file: %s", err)
+	}
+	file.Close()
+
+	if ok := IsFileOwner(path.Join(os.TempDir(), "testIsFileOwner")); !ok {
+		t.Fatalf("User should be owner of file")
+	}
+
+	if err = os.Remove(path.Join(os.TempDir(), "testIsFileOwner")); err != nil {
+		t.Fatalf("failed to remove file: %s", err)
+	}
+
+}