// cmdMount implements MOUNT command
// TODO: document behavior of cmdMount
func (builder *Builder) cmdMount(args []string, attributes map[string]bool, flags map[string]string, original string) error {
if len(args) == 0 {
return fmt.Errorf("Command is missing value: %s", original)
}
// TODO: read flags
useCache := false
newMounts := []*builderMount{}
newVolumeMounts := []*builderMount{}
for _, arg := range args {
var mount builderMount
if strings.Contains(arg, ":") {
pair := strings.SplitN(arg, ":", 2)
mount = builderMount{cache: useCache, src: pair[0], dest: pair[1]}
} else {
mount = builderMount{cache: useCache, dest: arg}
}
if mount.src == "" {
newVolumeMounts = append(newVolumeMounts, &mount)
} else {
// Process relative paths in volumes
if strings.HasPrefix(mount.src, "~") {
mount.src = strings.Replace(mount.src, "~", os.Getenv("HOME"), 1)
}
if !path.IsAbs(mount.src) {
mount.src = path.Join(builder.ContextDir, mount.src)
}
mount.origSrc = mount.src
var err error
if mount.src, err = dockerclient.ResolveHostPath(mount.src, builder.Docker); err != nil {
return err
}
}
newMounts = append(newMounts, &mount)
}
// For volume mounts we need to create (or use existing) volume container
if len(newVolumeMounts) > 0 {
// Collect destinations and sort them alphabetically
// so changing the order on MOUNT commend does not have any effect
dests := make([]string, len(newVolumeMounts))
containerVolumes := make(map[string]struct{})
for i, mount := range newVolumeMounts {
dests[i] = mount.dest
containerVolumes[mount.dest] = struct{}{}
}
sort.Strings(dests)
volumeContainerName := builder.mountsContainerName(dests)
containerConfig := &docker.Config{
Image: busyboxImage,
Volumes: containerVolumes,
Labels: map[string]string{
"Volumes": strings.Join(dests, ":"),
"Rockerfile": builder.Rockerfile,
"ImageId": builder.imageID,
},
}
container, err := builder.ensureContainer(volumeContainerName, containerConfig, strings.Join(dests, ","))
if err != nil {
return err
}
// Assing volume container to the list of volume mounts
for _, mount := range newVolumeMounts {
mount.containerID = container.ID
}
}
mountIds := make([]string, len(newMounts))
for i, mount := range newMounts {
builder.addMount(*mount)
mountIds[i] = mount.String()
}
// TODO: check is useCache flag enabled, so we have to make checksum of the directory
if err := builder.commitContainer("", builder.Config.Cmd, fmt.Sprintf("MOUNT %q", mountIds)); err != nil {
return err
}
return nil
}
// ResolveHostPath proxy for the dockerclient.ResolveHostPath
func (c *DockerClient) ResolveHostPath(path string) (resultPath string, err error) {
return dockerclient.ResolveHostPath(path, c.client)
}