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Allow normal volume to overwrite in start Binds

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Fixes #9981
Allows a volume which was created by docker (ie, in
/var/lib/docker/vfs/dir) to be used as a Bind argument via the container
start API and overwrite an existing volume.

For example:

```bash
docker create -v /foo --name one
docker create -v /foo --name two
```

This allows the volume from `one` to be passed into the container start
API as a bind to `two`, and it will overwrite it.

This was possible before 7107898d5c

Signed-off-by: Brian Goff <cpuguy83@gmail.com>
This commit is contained in:
Brian Goff 2015-01-26 17:31:30 -05:00
parent 19019722d9
commit 49e1ad49c8
2 changed files with 40 additions and 1 deletions
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4
daemon/volumes.go
View file

@ -25,6 +25,7 @@ type Mount struct {
Writable bool
copyData bool
from *Container
isBind bool
}
func (mnt *Mount) Export(resource string) (io.ReadCloser, error) {
@ -80,7 +81,7 @@ func (m *Mount) initialize() error {
if hostPath, exists := m.container.Volumes[m.MountToPath]; exists {
// If this is a bind-mount/volumes-from, maybe it was passed in at start instead of create
// We need to make sure bind-mounts/volumes-from passed on start can override existing ones.
if !m.volume.IsBindMount && m.from == nil {
if (!m.volume.IsBindMount && !m.isBind) && m.from == nil {
return nil
}
if m.volume.Path == hostPath {
@ -172,6 +173,7 @@ func (container *Container) parseVolumeMountConfig() (map[string]*Mount, error)
volume: vol,
MountToPath: mountToPath,
Writable: writable,
isBind: true, // in case the volume itself is a normal volume, but is being mounted in as a bindmount here
}
}

37
integration-cli/docker_api_containers_test.go
View file

@ -403,3 +403,40 @@ func TestBuildApiDockerfileSymlink(t *testing.T) {
logDone("container REST API - check build w/bad Dockerfile symlink path")
}
// #9981 - Allow a docker created volume (ie, one in /var/lib/docker/volumes) to be used to overwrite (via passing in Binds on api start) an existing volume
func TestPostContainerBindNormalVolume(t *testing.T) {
defer deleteAllContainers()
out, _, err := runCommandWithOutput(exec.Command(dockerBinary, "create", "-v", "/foo", "--name=one", "busybox"))
if err != nil {
t.Fatal(err, out)
}
fooDir, err := inspectFieldMap("one", "Volumes", "/foo")
if err != nil {
t.Fatal(err)
}
out, _, err = runCommandWithOutput(exec.Command(dockerBinary, "create", "-v", "/foo", "--name=two", "busybox"))
if err != nil {
t.Fatal(err, out)
}
bindSpec := map[string][]string{"Binds": {fooDir + ":/foo"}}
_, err = sockRequest("POST", "/containers/two/start", bindSpec)
if err != nil && !strings.Contains(err.Error(), "204 No Content") {
t.Fatal(err)
}
fooDir2, err := inspectFieldMap("two", "Volumes", "/foo")
if err != nil {
t.Fatal(err)
}
if fooDir2 != fooDir {
t.Fatal("expected volume path to be %s, got: %s", fooDir, fooDir2)
}
logDone("container REST API - can use path from normal volume as bind-mount to overwrite another volume")
}