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overlay2: fix unmounting layer without merge dir

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Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
(cherry picked from commit e1af6c8a57)
Signed-off-by: Victor Vieux <victorvieux@gmail.com>
This commit is contained in:
Tonis Tiigi 2017-02-15 17:55:50 -08:00 committed by Victor Vieux
parent bc8f9c8249
commit 8953fda3ef
1 changed files with 12 additions and 2 deletions
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14
daemon/graphdriver/overlay2/overlay.go
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@ -30,7 +30,7 @@ import (
"github.com/docker/docker/pkg/mount"
"github.com/docker/docker/pkg/parsers"
"github.com/docker/docker/pkg/parsers/kernel"
"github.com/docker/go-units"
units "github.com/docker/go-units"
"github.com/opencontainers/runc/libcontainer/label"
)
@ -553,7 +553,17 @@ func (d *Driver) Get(id string, mountLabel string) (s string, err error) {
// Put unmounts the mount path created for the give id.
func (d *Driver) Put(id string) error {
mountpoint := path.Join(d.dir(id), "merged")
dir := d.dir(id)
_, err := ioutil.ReadFile(path.Join(dir, lowerFile))
if err != nil {
// If no lower, no mount happened and just return directly
if os.IsNotExist(err) {
return nil
}
return err
}
mountpoint := path.Join(dir, "merged")
if count := d.ctr.Decrement(mountpoint); count > 0 {
return nil
}