// TarLayer returns a tar archive of the image's filesystem layer.
func (img *Image) TarLayer() (arch archive.Archive, err error) {
if img.graph == nil {
return nil, fmt.Errorf("Can't load storage driver for unregistered image %s", img.ID)
}
driver := img.graph.Driver()
if differ, ok := driver.(graphdriver.Differ); ok {
return differ.Diff(img.ID)
}
imgFs, err := driver.Get(img.ID, "")
if err != nil {
return nil, err
}
defer func() {
if err != nil {
driver.Put(img.ID)
}
}()
if img.Parent == "" {
archive, err := archive.Tar(imgFs, archive.Uncompressed)
if err != nil {
return nil, err
}
return utils.NewReadCloserWrapper(archive, func() error {
err := archive.Close()
driver.Put(img.ID)
return err
}), nil
}
parentFs, err := driver.Get(img.Parent, "")
if err != nil {
return nil, err
}
defer driver.Put(img.Parent)
changes, err := archive.ChangesDirs(imgFs, parentFs)
if err != nil {
return nil, err
}
archive, err := archive.ExportChanges(imgFs, changes)
if err != nil {
return nil, err
}
return utils.NewReadCloserWrapper(archive, func() error {
err := archive.Close()
driver.Put(img.ID)
return err
}), nil
}
func (container *Container) Export() (archive.Archive, error) {
if err := container.Mount(); err != nil {
return nil, err
}
archive, err := archive.Tar(container.basefs, archive.Uncompressed)
if err != nil {
container.Unmount()
return nil, err
}
return utils.NewReadCloserWrapper(archive, func() error {
err := archive.Close()
container.Unmount()
return err
}),
nil
}
// CmdImageExport exports all images with the given tag. All versions
// containing the same tag are exported. The resulting output is an
// uncompressed tar ball.
// name is the set of tags to export.
// out is the writer where the images are written to.
func (s *TagStore) CmdImageExport(job *engine.Job) engine.Status {
if len(job.Args) != 1 {
return job.Errorf("Usage: %s IMAGE\n", job.Name)
}
name := job.Args[0]
// get image json
tempdir, err := ioutil.TempDir("", "docker-export-")
if err != nil {
return job.Error(err)
}
defer os.RemoveAll(tempdir)
log.Debugf("Serializing %s", name)
rootRepoMap := map[string]Repository{}
rootRepo, err := s.Get(name)
if err != nil {
return job.Error(err)
}
if rootRepo != nil {
// this is a base repo name, like 'busybox'
for _, id := range rootRepo {
if err := s.exportImage(job.Eng, id, tempdir); err != nil {
return job.Error(err)
}
}
rootRepoMap[name] = rootRepo
} else {
img, err := s.LookupImage(name)
if err != nil {
return job.Error(err)
}
if img != nil {
// This is a named image like 'busybox:latest'
repoName, repoTag := parsers.ParseRepositoryTag(name)
if err := s.exportImage(job.Eng, img.ID, tempdir); err != nil {
return job.Error(err)
}
// check this length, because a lookup of a truncated has will not have a tag
// and will not need to be added to this map
if len(repoTag) > 0 {
rootRepoMap[repoName] = Repository{repoTag: img.ID}
}
} else {
// this must be an ID that didn't get looked up just right?
if err := s.exportImage(job.Eng, name, tempdir); err != nil {
return job.Error(err)
}
}
}
// write repositories, if there is something to write
if len(rootRepoMap) > 0 {
rootRepoJson, _ := json.Marshal(rootRepoMap)
if err := ioutil.WriteFile(path.Join(tempdir, "repositories"), rootRepoJson, os.FileMode(0644)); err != nil {
return job.Error(err)
}
} else {
log.Debugf("There were no repositories to write")
}
fs, err := archive.Tar(tempdir, archive.Uncompressed)
if err != nil {
return job.Error(err)
}
defer fs.Close()
if _, err := io.Copy(job.Stdout, fs); err != nil {
return job.Error(err)
}
log.Debugf("End Serializing %s", name)
return engine.StatusOK
}
func (b *buildFile) runContextCommand(args string, allowRemote bool, allowDecompression bool, cmdName string) error {
if b.context == nil {
return fmt.Errorf("No context given. Impossible to use %s", cmdName)
}
tmp := strings.SplitN(args, " ", 2)
if len(tmp) != 2 {
return fmt.Errorf("Invalid %s format", cmdName)
}
orig, err := b.ReplaceEnvMatches(strings.Trim(tmp[0], " \t"))
if err != nil {
return err
}
dest, err := b.ReplaceEnvMatches(strings.Trim(tmp[1], " \t"))
if err != nil {
return err
}
cmd := b.config.Cmd
b.config.Cmd = []string{"/bin/sh", "-c", fmt.Sprintf("#(nop) %s %s in %s", cmdName, orig, dest)}
defer func(cmd []string) { b.config.Cmd = cmd }(cmd)
b.config.Image = b.image
var (
origPath = orig
destPath = dest
remoteHash string
isRemote bool
decompress = true
)
isRemote = utils.IsURL(orig)
if isRemote && !allowRemote {
return fmt.Errorf("Source can't be an URL for %s", cmdName)
} else if utils.IsURL(orig) {
// Initiate the download
resp, err := utils.Download(orig)
if err != nil {
return err
}
// Create a tmp dir
tmpDirName, err := ioutil.TempDir(b.contextPath, "docker-remote")
if err != nil {
return err
}
// Create a tmp file within our tmp dir
tmpFileName := path.Join(tmpDirName, "tmp")
tmpFile, err := os.OpenFile(tmpFileName, os.O_RDWR|os.O_CREATE|os.O_EXCL, 0600)
if err != nil {
return err
}
defer os.RemoveAll(tmpDirName)
// Download and dump result to tmp file
if _, err := io.Copy(tmpFile, resp.Body); err != nil {
tmpFile.Close()
return err
}
tmpFile.Close()
// Remove the mtime of the newly created tmp file
if err := system.UtimesNano(tmpFileName, make([]syscall.Timespec, 2)); err != nil {
return err
}
origPath = path.Join(filepath.Base(tmpDirName), filepath.Base(tmpFileName))
// Process the checksum
r, err := archive.Tar(tmpFileName, archive.Uncompressed)
if err != nil {
return err
}
tarSum := &tarsum.TarSum{Reader: r, DisableCompression: true}
if _, err := io.Copy(ioutil.Discard, tarSum); err != nil {
return err
}
remoteHash = tarSum.Sum(nil)
r.Close()
// If the destination is a directory, figure out the filename.
if strings.HasSuffix(dest, "/") {
u, err := url.Parse(orig)
if err != nil {
return err
}
path := u.Path
if strings.HasSuffix(path, "/") {
path = path[:len(path)-1]
}
parts := strings.Split(path, "/")
filename := parts[len(parts)-1]
if filename == "" {
return fmt.Errorf("cannot determine filename from url: %s", u)
}
destPath = dest + filename
}
}
if err := b.checkPathForAddition(origPath); err != nil {
return err
}
// Hash path and check the cache
if b.utilizeCache {
var (
hash string
sums = b.context.GetSums()
)
if remoteHash != "" {
hash = remoteHash
} else if fi, err := os.Stat(path.Join(b.contextPath, origPath)); err != nil {
return err
} else if fi.IsDir() {
var subfiles []string
for file, sum := range sums {
absFile := path.Join(b.contextPath, file)
absOrigPath := path.Join(b.contextPath, origPath)
if strings.HasPrefix(absFile, absOrigPath) {
subfiles = append(subfiles, sum)
}
}
sort.Strings(subfiles)
hasher := sha256.New()
hasher.Write([]byte(strings.Join(subfiles, ",")))
hash = "dir:" + hex.EncodeToString(hasher.Sum(nil))
} else {
if origPath[0] == '/' && len(origPath) > 1 {
origPath = origPath[1:]
}
origPath = strings.TrimPrefix(origPath, "./")
if h, ok := sums[origPath]; ok {
hash = "file:" + h
}
}
b.config.Cmd = []string{"/bin/sh", "-c", fmt.Sprintf("#(nop) %s %s in %s", cmdName, hash, dest)}
hit, err := b.probeCache()
if err != nil {
return err
}
// If we do not have a hash, never use the cache
if hit && hash != "" {
return nil
}
}
// Create the container
container, _, err := b.daemon.Create(b.config, "")
if err != nil {
return err
}
b.tmpContainers[container.ID] = struct{}{}
if err := container.Mount(); err != nil {
return err
}
defer container.Unmount()
if !allowDecompression || isRemote {
decompress = false
}
if err := b.addContext(container, origPath, destPath, decompress); err != nil {
return err
}
if err := b.commit(container.ID, cmd, fmt.Sprintf("%s %s in %s", cmdName, orig, dest)); err != nil {
return err
}
return nil
}
func (daemon *Daemon) CmdBuild(job *engine.Job) engine.Status {
if len(job.Args) != 0 {
return job.Errorf("Usage: %s\n", job.Name)
}
var (
remoteURL = job.Getenv("remote")
repoName = job.Getenv("t")
suppressOutput = job.GetenvBool("q")
noCache = job.GetenvBool("nocache")
rm = job.GetenvBool("rm")
forceRm = job.GetenvBool("forcerm")
authConfig = ®istry.AuthConfig{}
configFile = ®istry.ConfigFile{}
tag string
context io.ReadCloser
)
job.GetenvJson("authConfig", authConfig)
job.GetenvJson("configFile", configFile)
repoName, tag = parsers.ParseRepositoryTag(repoName)
if remoteURL == "" {
context = ioutil.NopCloser(job.Stdin)
} else if utils.IsGIT(remoteURL) {
if !strings.HasPrefix(remoteURL, "git://") {
remoteURL = "https://" + remoteURL
}
root, err := ioutil.TempDir("", "docker-build-git")
if err != nil {
return job.Error(err)
}
defer os.RemoveAll(root)
if output, err := exec.Command("git", "clone", "--recursive", remoteURL, root).CombinedOutput(); err != nil {
return job.Errorf("Error trying to use git: %s (%s)", err, output)
}
c, err := archive.Tar(root, archive.Uncompressed)
if err != nil {
return job.Error(err)
}
context = c
} else if utils.IsURL(remoteURL) {
f, err := utils.Download(remoteURL)
if err != nil {
return job.Error(err)
}
defer f.Body.Close()
dockerFile, err := ioutil.ReadAll(f.Body)
if err != nil {
return job.Error(err)
}
c, err := archive.Generate("Dockerfile", string(dockerFile))
if err != nil {
return job.Error(err)
}
context = c
}
defer context.Close()
sf := utils.NewStreamFormatter(job.GetenvBool("json"))
b := NewBuildFile(daemon, daemon.eng,
&utils.StdoutFormater{
Writer: job.Stdout,
StreamFormatter: sf,
},
&utils.StderrFormater{
Writer: job.Stdout,
StreamFormatter: sf,
},
!suppressOutput, !noCache, rm, forceRm, job.Stdout, sf, authConfig, configFile)
id, err := b.Build(context)
if err != nil {
return job.Error(err)
}
if repoName != "" {
daemon.Repositories().Set(repoName, tag, id, false)
}
return engine.StatusOK
}