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Use tryRelocate to fall back to symlink if rename fails

This commit is contained in:
Michael Crosby 2013-11-18 13:16:28 -08:00
parent a518b84751
commit 94e854823f
1 changed files with 13 additions and 1 deletions
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14
graphdriver/aufs/migrate.go
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@ -1,6 +1,7 @@
package aufs package aufs
import ( import (
"fmt"
"io/ioutil" "io/ioutil"
"os" "os"
"path" "path"
@ -20,7 +21,7 @@ func (a *AufsDriver) Migrate(pth string) error {
} }
for _, fi := range fis { for _, fi := range fis {
if fi.IsDir() && exists(path.Join(pth, fi.Name(), "layer")) && !a.Exists(fi.Name()) { if fi.IsDir() && exists(path.Join(pth, fi.Name(), "layer")) && !a.Exists(fi.Name()) {
if err := os.Symlink(path.Join(pth, fi.Name(), "layer"), path.Join(a.rootPath(), "diff", fi.Name())); err != nil { if err := tryRelocate(path.Join(pth, fi.Name(), "layer"), path.Join(a.rootPath(), "diff", fi.Name())); err != nil {
return err return err
} }
if err := a.Create(fi.Name(), ""); err != nil { if err := a.Create(fi.Name(), ""); err != nil {
@ -30,3 +31,14 @@ func (a *AufsDriver) Migrate(pth string) error {
} }
return nil return nil
} }
// tryRelocate will try to rename the old path to the new pack and if
// the operation fails, it will fallback to a symlink
func tryRelocate(oldPath, newPath string) error {
if err := os.Rename(oldPath, newPath); err != nil {
if sErr := os.Symlink(oldPath, newPath); sErr != nil {
return fmt.Errorf("Unable to relocate %s to %s: Rename err %s Symlink err %s", oldPath, newPath, err, sErr)
}
}
return nil
}