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overlay: Export metadata for container and image in docker-inspect 

Export metadata for container and image in docker-inspect when overlay
graphdriver is in use. Right now it is done only for devicemapper graph
driver.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
This commit is contained in:
Vivek Goyal 2015-06-25 17:33:20 -04:00
parent 50a1d0f0ef
commit 67473c6d06
1 changed files with 25 additions and 1 deletions
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26
daemon/graphdriver/overlay/overlay.go
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@ -168,7 +168,31 @@ func (d *Driver) Status() [][2]string {
}
func (d *Driver) GetMetadata(id string) (map[string]string, error) {
return nil, nil
dir := d.dir(id)
if _, err := os.Stat(dir); err != nil {
return nil, err
}
metadata := make(map[string]string)
// If id has a root, it is an image
rootDir := path.Join(dir, "root")
if _, err := os.Stat(rootDir); err == nil {
metadata["RootDir"] = rootDir
return metadata, nil
}
lowerId, err := ioutil.ReadFile(path.Join(dir, "lower-id"))
if err != nil {
return nil, err
}
metadata["LowerDir"] = path.Join(d.dir(string(lowerId)), "root")
metadata["UpperDir"] = path.Join(dir, "upper")
metadata["WorkDir"] = path.Join(dir, "work")
metadata["MergedDir"] = path.Join(dir, "merged")
return metadata, nil
}
func (d *Driver) Cleanup() error {