// getContextFromReader will read the contents of the given reader as either a
// Dockerfile or tar archive to be extracted to a temporary directory used as
// the context directory. Returns the absolute path to the temporary context
// directory, the relative path of the dockerfile in that context directory,
// and a non-nil error on success.
func getContextFromReader(r io.Reader, dockerfileName string) (absContextDir, relDockerfile string, err error) {
buf := bufio.NewReader(r)
magic, err := buf.Peek(archive.HeaderSize)
if err != nil && err != io.EOF {
return "", "", fmt.Errorf("failed to peek context header from STDIN: %v", err)
}
if absContextDir, err = ioutil.TempDir("", "docker-build-context-"); err != nil {
return "", "", fmt.Errorf("unbale to create temporary context directory: %v", err)
}
defer func(d string) {
if err != nil {
os.RemoveAll(d)
}
}(absContextDir)
if !archive.IsArchive(magic) { // Input should be read as a Dockerfile.
// -f option has no meaning when we're reading it from stdin,
// so just use our default Dockerfile name
relDockerfile = api.DefaultDockerfileName
return absContextDir, relDockerfile, writeToFile(buf, filepath.Join(absContextDir, relDockerfile))
}
if err := archive.Untar(buf, absContextDir, nil); err != nil {
return "", "", fmt.Errorf("unable to extract stdin to temporary context directory: %v", err)
}
return getDockerfileRelPath(absContextDir, dockerfileName)
}
// getContextFromReader will read the contents of the given reader as either a
// Dockerfile or tar archive. Returns a tar archive used as a context and a
// path to the Dockerfile inside the tar.
func getContextFromReader(r io.ReadCloser, dockerfileName string) (out io.ReadCloser, relDockerfile string, err error) {
buf := bufio.NewReader(r)
magic, err := buf.Peek(archive.HeaderSize)
if err != nil && err != io.EOF {
return nil, "", fmt.Errorf("failed to peek context header from STDIN: %v", err)
}
if archive.IsArchive(magic) {
return ioutils.NewReadCloserWrapper(buf, func() error { return r.Close() }), dockerfileName, nil
}
// Input should be read as a Dockerfile.
tmpDir, err := ioutil.TempDir("", "docker-build-context-")
if err != nil {
return nil, "", fmt.Errorf("unbale to create temporary context directory: %v", err)
}
f, err := os.Create(filepath.Join(tmpDir, api.DefaultDockerfileName))
if err != nil {
return nil, "", err
}
_, err = io.Copy(f, buf)
if err != nil {
f.Close()
return nil, "", err
}
if err := f.Close(); err != nil {
return nil, "", err
}
if err := r.Close(); err != nil {
return nil, "", err
}
tar, err := archive.Tar(tmpDir, archive.Uncompressed)
if err != nil {
return nil, "", err
}
return ioutils.NewReadCloserWrapper(tar, func() error {
err := tar.Close()
os.RemoveAll(tmpDir)
return err
}), api.DefaultDockerfileName, nil
}
// CmdBuild builds a new image from the source code at a given path.
//
// If '-' is provided instead of a path or URL, Docker will build an image from either a Dockerfile or tar archive read from STDIN.
//
// Usage: docker build [OPTIONS] PATH | URL | -
func (cli *DockerCli) CmdBuild(args ...string) error {
cmd := cli.Subcmd("build", "PATH | URL | -", "Build a new image from the source code at PATH", true)
tag := cmd.String([]string{"t", "-tag"}, "", "Repository name (and optionally a tag) for the image")
suppressOutput := cmd.Bool([]string{"q", "-quiet"}, false, "Suppress the verbose output generated by the containers")
noCache := cmd.Bool([]string{"#no-cache", "-no-cache"}, false, "Do not use cache when building the image")
rm := cmd.Bool([]string{"#rm", "-rm"}, true, "Remove intermediate containers after a successful build")
forceRm := cmd.Bool([]string{"-force-rm"}, false, "Always remove intermediate containers")
pull := cmd.Bool([]string{"-pull"}, false, "Always attempt to pull a newer version of the image")
dockerfileName := cmd.String([]string{"f", "-file"}, "", "Name of the Dockerfile (Default is 'PATH/Dockerfile')")
flMemoryString := cmd.String([]string{"m", "-memory"}, "", "Memory limit")
flMemorySwap := cmd.String([]string{"-memory-swap"}, "", "Total memory (memory + swap), '-1' to disable swap")
flCPUShares := cmd.Int64([]string{"c", "-cpu-shares"}, 0, "CPU shares (relative weight)")
flCpuQuota := cmd.Int64([]string{"-cpu-quota"}, 0, "Limit the CPU CFS (Completely Fair Scheduler) quota")
flCPUSetCpus := cmd.String([]string{"-cpuset-cpus"}, "", "CPUs in which to allow execution (0-3, 0,1)")
flCPUSetMems := cmd.String([]string{"-cpuset-mems"}, "", "MEMs in which to allow execution (0-3, 0,1)")
flCgroupParent := cmd.String([]string{"-cgroup-parent"}, "", "Optional parent cgroup for the container")
cmd.Require(flag.Exact, 1)
cmd.ParseFlags(args, true)
var (
context archive.Archive
isRemote bool
err error
)
_, err = exec.LookPath("git")
hasGit := err == nil
if cmd.Arg(0) == "-" {
// As a special case, 'docker build -' will build from either an empty context with the
// contents of stdin as a Dockerfile, or a tar-ed context from stdin.
buf := bufio.NewReader(cli.in)
magic, err := buf.Peek(tarHeaderSize)
if err != nil && err != io.EOF {
return fmt.Errorf("failed to peek context header from STDIN: %v", err)
}
if !archive.IsArchive(magic) {
dockerfile, err := ioutil.ReadAll(buf)
if err != nil {
return fmt.Errorf("failed to read Dockerfile from STDIN: %v", err)
}
// -f option has no meaning when we're reading it from stdin,
// so just use our default Dockerfile name
*dockerfileName = api.DefaultDockerfileName
context, err = archive.Generate(*dockerfileName, string(dockerfile))
} else {
context = ioutil.NopCloser(buf)
}
} else if urlutil.IsURL(cmd.Arg(0)) && (!urlutil.IsGitURL(cmd.Arg(0)) || !hasGit) {
isRemote = true
} else {
root := cmd.Arg(0)
if urlutil.IsGitURL(root) {
root, err = utils.GitClone(root)
if err != nil {
return err
}
defer os.RemoveAll(root)
}
if _, err := os.Stat(root); err != nil {
return err
}
absRoot, err := filepath.Abs(root)
if err != nil {
return err
}
filename := *dockerfileName // path to Dockerfile
if *dockerfileName == "" {
// No -f/--file was specified so use the default
*dockerfileName = api.DefaultDockerfileName
filename = filepath.Join(absRoot, *dockerfileName)
// Just to be nice ;-) look for 'dockerfile' too but only
// use it if we found it, otherwise ignore this check
if _, err = os.Lstat(filename); os.IsNotExist(err) {
tmpFN := path.Join(absRoot, strings.ToLower(*dockerfileName))
if _, err = os.Lstat(tmpFN); err == nil {
*dockerfileName = strings.ToLower(*dockerfileName)
filename = tmpFN
}
}
}
origDockerfile := *dockerfileName // used for error msg
if filename, err = filepath.Abs(filename); err != nil {
return err
}
// Verify that 'filename' is within the build context
filename, err = symlink.FollowSymlinkInScope(filename, absRoot)
if err != nil {
return fmt.Errorf("The Dockerfile (%s) must be within the build context (%s)", origDockerfile, root)
}
// Now reset the dockerfileName to be relative to the build context
*dockerfileName, err = filepath.Rel(absRoot, filename)
if err != nil {
return err
}
// And canonicalize dockerfile name to a platform-independent one
*dockerfileName, err = archive.CanonicalTarNameForPath(*dockerfileName)
if err != nil {
return fmt.Errorf("Cannot canonicalize dockerfile path %s: %v", *dockerfileName, err)
}
if _, err = os.Lstat(filename); os.IsNotExist(err) {
return fmt.Errorf("Cannot locate Dockerfile: %s", origDockerfile)
}
var includes = []string{"."}
excludes, err := utils.ReadDockerIgnore(path.Join(root, ".dockerignore"))
if err != nil {
return err
}
// If .dockerignore mentions .dockerignore or the Dockerfile
// then make sure we send both files over to the daemon
// because Dockerfile is, obviously, needed no matter what, and
// .dockerignore is needed to know if either one needs to be
// removed. The deamon will remove them for us, if needed, after it
// parses the Dockerfile.
keepThem1, _ := fileutils.Matches(".dockerignore", excludes)
keepThem2, _ := fileutils.Matches(*dockerfileName, excludes)
if keepThem1 || keepThem2 {
includes = append(includes, ".dockerignore", *dockerfileName)
}
if err := utils.ValidateContextDirectory(root, excludes); err != nil {
return fmt.Errorf("Error checking context is accessible: '%s'. Please check permissions and try again.", err)
}
options := &archive.TarOptions{
Compression: archive.Uncompressed,
ExcludePatterns: excludes,
IncludeFiles: includes,
}
context, err = archive.TarWithOptions(root, options)
if err != nil {
return err
}
}
// windows: show error message about modified file permissions
// FIXME: this is not a valid warning when the daemon is running windows. should be removed once docker engine for windows can build.
if runtime.GOOS == "windows" {
logrus.Warn(`SECURITY WARNING: You are building a Docker image from Windows against a Linux Docker host. All files and directories added to build context will have '-rwxr-xr-x' permissions. It is recommended to double check and reset permissions for sensitive files and directories.`)
}
var body io.Reader
// Setup an upload progress bar
// FIXME: ProgressReader shouldn't be this annoying to use
if context != nil {
sf := streamformatter.NewStreamFormatter(false)
body = progressreader.New(progressreader.Config{
In: context,
Out: cli.out,
Formatter: sf,
NewLines: true,
ID: "",
Action: "Sending build context to Docker daemon",
})
}
var memory int64
if *flMemoryString != "" {
parsedMemory, err := units.RAMInBytes(*flMemoryString)
if err != nil {
return err
}
memory = parsedMemory
}
var memorySwap int64
if *flMemorySwap != "" {
if *flMemorySwap == "-1" {
memorySwap = -1
} else {
parsedMemorySwap, err := units.RAMInBytes(*flMemorySwap)
if err != nil {
return err
}
memorySwap = parsedMemorySwap
}
}
// Send the build context
v := &url.Values{}
//Check if the given image name can be resolved
if *tag != "" {
repository, tag := parsers.ParseRepositoryTag(*tag)
if err := registry.ValidateRepositoryName(repository); err != nil {
return err
}
if len(tag) > 0 {
if err := graph.ValidateTagName(tag); err != nil {
return err
}
}
}
v.Set("t", *tag)
if *suppressOutput {
v.Set("q", "1")
}
if isRemote {
v.Set("remote", cmd.Arg(0))
}
if *noCache {
v.Set("nocache", "1")
}
if *rm {
v.Set("rm", "1")
} else {
v.Set("rm", "0")
}
if *forceRm {
v.Set("forcerm", "1")
}
if *pull {
v.Set("pull", "1")
}
v.Set("cpusetcpus", *flCPUSetCpus)
v.Set("cpusetmems", *flCPUSetMems)
v.Set("cpushares", strconv.FormatInt(*flCPUShares, 10))
v.Set("cpuquota", strconv.FormatInt(*flCpuQuota, 10))
v.Set("memory", strconv.FormatInt(memory, 10))
v.Set("memswap", strconv.FormatInt(memorySwap, 10))
v.Set("cgroupparent", *flCgroupParent)
v.Set("dockerfile", *dockerfileName)
headers := http.Header(make(map[string][]string))
buf, err := json.Marshal(cli.configFile.AuthConfigs)
if err != nil {
return err
}
headers.Add("X-Registry-Config", base64.URLEncoding.EncodeToString(buf))
if context != nil {
headers.Set("Content-Type", "application/tar")
}
sopts := &streamOpts{
rawTerminal: true,
in: body,
out: cli.out,
headers: headers,
}
err = cli.stream("POST", fmt.Sprintf("/build?%s", v.Encode()), sopts)
if jerr, ok := err.(*jsonmessage.JSONError); ok {
// If no error code is set, default to 1
if jerr.Code == 0 {
jerr.Code = 1
}
return StatusError{Status: jerr.Message, StatusCode: jerr.Code}
}
return err
}