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Cleanup docker tmp dir on start

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Signed-off-by: Kenfe-Mickael Laventure <mickael.laventure@gmail.com>
This commit is contained in:
Kenfe-Mickael Laventure 2017-03-10 09:47:25 -08:00
parent 47cd4bf526
commit 9c451ad0f2
1 changed files with 20 additions and 3 deletions
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23
daemon/daemon.go
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@ -505,7 +505,7 @@ func NewDaemon(config *config.Config, registryService registry.Service, containe
}
// set up the tmpDir to use a canonical path
tmp, err := tempDir(config.Root, rootUID, rootGID)
tmp, err := prepareTempDir(config.Root, rootUID, rootGID)
if err != nil {
return nil, fmt.Errorf("Unable to get the TempDir under %s: %s", config.Root, err)
}
@ -922,12 +922,29 @@ func (daemon *Daemon) GetRemappedUIDGID() (int, int) {
return uid, gid
}
// tempDir returns the default directory to use for temporary files.
func tempDir(rootDir string, rootUID, rootGID int) (string, error) {
// prepareTempDir prepares and returns the default directory to use
// for temporary files.
// If it doesn't exist, it is created. If it exists, its content is removed.
func prepareTempDir(rootDir string, rootUID, rootGID int) (string, error) {
var tmpDir string
if tmpDir = os.Getenv("DOCKER_TMPDIR"); tmpDir == "" {
tmpDir = filepath.Join(rootDir, "tmp")
newName := tmpDir + "-old"
if err := os.Rename(tmpDir, newName); err != nil {
go func() {
if err := os.RemoveAll(newName); err != nil {
logrus.Warnf("failed to delete old tmp directory: %s", newName)
}
}()
} else {
logrus.Warnf("failed to rename %s for background deletion: %s. Deleting synchronously", tmpDir, err)
if err := os.RemoveAll(tmpDir); err != nil {
logrus.Warnf("failed to delete old tmp directory: %s", tmpDir)
}
}
}
// We don't remove the content of tmpdir if it's not the default,
// it may hold things that do not belong to us.
return tmpDir, idtools.MkdirAllAs(tmpDir, 0700, rootUID, rootGID)
}