Windows: Fix PR13278 compile break

Signed-off-by: John Howard <jhoward@microsoft.com>

1 files changed, 32 insertions, 0 deletions

diff --git a/daemon/volumes_linux.go b/daemon/volumes_linux.go
index 8eea5e067f..e522001501 100644
--- a/daemon/volumes_linux.go
+++ b/daemon/volumes_linux.go
@@ -8,6 +8,7 @@ import (
 	"sort"
 	"strings"
 
+	"github.com/Sirupsen/logrus"
 	"github.com/docker/docker/daemon/execdriver"
 	"github.com/docker/docker/pkg/system"
 )
@@ -68,3 +69,34 @@ func (m mounts) Swap(i, j int) {
 func (m mounts) parts(i int) int {
 	return len(strings.Split(filepath.Clean(m[i].Destination), string(os.PathSeparator)))
 }
+
+// migrateVolume moves the contents of a volume created pre Docker 1.7
+// to the location expected by the local driver. Steps:
+// 1. Save old directory that includes old volume's config json file.
+// 2. Move virtual directory with content to where the local driver expects it to be.
+// 3. Remove the backup of the old volume config.
+func (daemon *Daemon) migrateVolume(id, vfs string) error {
+	volumeInfo := filepath.Join(daemon.root, defaultVolumesPathName, id)
+	backup := filepath.Join(daemon.root, defaultVolumesPathName, id+".back")
+
+	var err error
+	if err = os.Rename(volumeInfo, backup); err != nil {
+		return err
+	}
+	defer func() {
+		// Put old configuration back in place in case one of the next steps fails.
+		if err != nil {
+			os.Rename(backup, volumeInfo)
+		}
+	}()
+
+	if err = os.Rename(vfs, volumeInfo); err != nil {
+		return err
+	}
+
+	if err = os.RemoveAll(backup); err != nil {
+		logrus.Errorf("Unable to remove volume info backup directory %s: %v", backup, err)
+	}
+
+	return nil
+}