package docker import ( "encoding/json" "fmt" "github.com/dotcloud/docker/utils" "io" "io/ioutil" "net/url" "os" "path" "reflect" "regexp" "strings" ) type BuildFile interface { Build(io.Reader) (string, error) CmdFrom(string) error CmdRun(string) error } type buildFile struct { runtime *Runtime srv *Server image string maintainer string config *Config context string verbose bool utilizeCache bool rm bool tmpContainers map[string]struct{} tmpImages map[string]struct{} out io.Writer } func (b *buildFile) clearTmp(containers map[string]struct{}) { for c := range containers { tmp := b.runtime.Get(c) b.runtime.Destroy(tmp) fmt.Fprintf(b.out, "Removing intermediate container %s\n", utils.TruncateID(c)) } } func (b *buildFile) CmdFrom(name string) error { image, err := b.runtime.repositories.LookupImage(name) if err != nil { if b.runtime.graph.IsNotExist(err) { remote, tag := utils.ParseRepositoryTag(name) if err := b.srv.ImagePull(remote, tag, b.out, utils.NewStreamFormatter(false), nil, nil, true); err != nil { return err } image, err = b.runtime.repositories.LookupImage(name) if err != nil { return err } } else { return err } } b.image = image.ID b.config = &Config{} if b.config.Env == nil || len(b.config.Env) == 0 { b.config.Env = append(b.config.Env, "HOME=/", "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin") } return nil } func (b *buildFile) CmdMaintainer(name string) error { b.maintainer = name return b.commit("", b.config.Cmd, fmt.Sprintf("MAINTAINER %s", name)) } func (b *buildFile) CmdRun(args string) error { if b.image == "" { return fmt.Errorf("Please provide a source image with `from` prior to run") } config, _, _, err := ParseRun([]string{b.image, "/bin/sh", "-c", args}, nil) if err != nil { return err } cmd := b.config.Cmd b.config.Cmd = nil MergeConfig(b.config, config) defer func(cmd []string) { b.config.Cmd = cmd }(cmd) utils.Debugf("Command to be executed: %v", b.config.Cmd) if b.utilizeCache { if cache, err := b.srv.ImageGetCached(b.image, b.config); err != nil { return err } else if cache != nil { fmt.Fprintf(b.out, " ---> Using cache\n") utils.Debugf("[BUILDER] Use cached version") b.image = cache.ID return nil } else { utils.Debugf("[BUILDER] Cache miss") } } cid, err := b.run() if err != nil { return err } if err := b.commit(cid, cmd, "run"); err != nil { return err } return nil } func (b *buildFile) FindEnvKey(key string) int { for k, envVar := range b.config.Env { envParts := strings.SplitN(envVar, "=", 2) if key == envParts[0] { return k } } return -1 } func (b *buildFile) ReplaceEnvMatches(value string) (string, error) { exp, err := regexp.Compile("(\\\\\\\\+|[^\\\\]|\\b|\\A)\\$({?)([[:alnum:]_]+)(}?)") if err != nil { return value, err } matches := exp.FindAllString(value, -1) for _, match := range matches { match = match[strings.Index(match, "$"):] matchKey := strings.Trim(match, "${}") for _, envVar := range b.config.Env { envParts := strings.SplitN(envVar, "=", 2) envKey := envParts[0] envValue := envParts[1] if envKey == matchKey { value = strings.Replace(value, match, envValue, -1) break } } } return value, nil } func (b *buildFile) CmdEnv(args string) error { tmp := strings.SplitN(args, " ", 2) if len(tmp) != 2 { return fmt.Errorf("Invalid ENV format") } key := strings.Trim(tmp[0], " \t") value := strings.Trim(tmp[1], " \t") envKey := b.FindEnvKey(key) replacedValue, err := b.ReplaceEnvMatches(value) if err != nil { return err } replacedVar := fmt.Sprintf("%s=%s", key, replacedValue) if envKey >= 0 { b.config.Env[envKey] = replacedVar } else { b.config.Env = append(b.config.Env, replacedVar) } return b.commit("", b.config.Cmd, fmt.Sprintf("ENV %s", replacedVar)) } func (b *buildFile) CmdCmd(args string) error { var cmd []string if err := json.Unmarshal([]byte(args), &cmd); err != nil { utils.Debugf("Error unmarshalling: %s, setting cmd to /bin/sh -c", err) cmd = []string{"/bin/sh", "-c", args} } if err := b.commit("", cmd, fmt.Sprintf("CMD %v", cmd)); err != nil { return err } b.config.Cmd = cmd return nil } func (b *buildFile) CmdExpose(args string) error { ports := strings.Split(args, " ") b.config.PortSpecs = append(ports, b.config.PortSpecs...) return b.commit("", b.config.Cmd, fmt.Sprintf("EXPOSE %v", ports)) } func (b *buildFile) CmdUser(args string) error { b.config.User = args return b.commit("", b.config.Cmd, fmt.Sprintf("USER %v", args)) } func (b *buildFile) CmdInsert(args string) error { return fmt.Errorf("INSERT has been deprecated. Please use ADD instead") } func (b *buildFile) CmdCopy(args string) error { return fmt.Errorf("COPY has been deprecated. Please use ADD instead") } func (b *buildFile) CmdEntrypoint(args string) error { if args == "" { return fmt.Errorf("Entrypoint cannot be empty") } var entrypoint []string if err := json.Unmarshal([]byte(args), &entrypoint); err != nil { b.config.Entrypoint = []string{"/bin/sh", "-c", args} } else { b.config.Entrypoint = entrypoint } if err := b.commit("", b.config.Cmd, fmt.Sprintf("ENTRYPOINT %s", args)); err != nil { return err } return nil } func (b *buildFile) CmdWorkdir(workdir string) error { b.config.WorkingDir = workdir return b.commit("", b.config.Cmd, fmt.Sprintf("WORKDIR %v", workdir)) } func (b *buildFile) CmdVolume(args string) error { if args == "" { return fmt.Errorf("Volume cannot be empty") } var volume []string if err := json.Unmarshal([]byte(args), &volume); err != nil { volume = []string{args} } if b.config.Volumes == nil { b.config.Volumes = NewPathOpts() } for _, v := range volume { b.config.Volumes[v] = struct{}{} } if err := b.commit("", b.config.Cmd, fmt.Sprintf("VOLUME %s", args)); err != nil { return err } return nil } func (b *buildFile) addRemote(container *Container, orig, dest string) error { file, err := utils.Download(orig, ioutil.Discard) if err != nil { return err } defer file.Body.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) } dest = dest + filename } return container.Inject(file.Body, dest) } func (b *buildFile) addContext(container *Container, orig, dest string) error { origPath := path.Join(b.context, orig) destPath := path.Join(container.RootfsPath(), dest) // Preserve the trailing '/' if strings.HasSuffix(dest, "/") { destPath = destPath + "/" } if !strings.HasPrefix(origPath, b.context) { return fmt.Errorf("Forbidden path: %s", origPath) } fi, err := os.Stat(origPath) if err != nil { return fmt.Errorf("%s: no such file or directory", orig) } if fi.IsDir() { if err := CopyWithTar(origPath, destPath); err != nil { return err } // First try to unpack the source as an archive } else if err := UntarPath(origPath, destPath); err != nil { utils.Debugf("Couldn't untar %s to %s: %s", origPath, destPath, err) // If that fails, just copy it as a regular file if err := os.MkdirAll(path.Dir(destPath), 0755); err != nil { return err } if err := CopyWithTar(origPath, destPath); err != nil { return err } } return nil } func (b *buildFile) CmdAdd(args string) error { if b.context == "" { return fmt.Errorf("No context given. Impossible to use ADD") } tmp := strings.SplitN(args, " ", 2) if len(tmp) != 2 { return fmt.Errorf("Invalid ADD format") } 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) ADD %s in %s", orig, dest)} b.config.Image = b.image // Create the container and start it container, err := b.runtime.Create(b.config) if err != nil { return err } b.tmpContainers[container.ID] = struct{}{} if err := container.EnsureMounted(); err != nil { return err } defer container.Unmount() if utils.IsURL(orig) { if err := b.addRemote(container, orig, dest); err != nil { return err } } else { if err := b.addContext(container, orig, dest); err != nil { return err } } if err := b.commit(container.ID, cmd, fmt.Sprintf("ADD %s in %s", orig, dest)); err != nil { return err } b.config.Cmd = cmd return nil } func (b *buildFile) run() (string, error) { if b.image == "" { return "", fmt.Errorf("Please provide a source image with `from` prior to run") } b.config.Image = b.image // Create the container and start it c, err := b.runtime.Create(b.config) if err != nil { return "", err } b.tmpContainers[c.ID] = struct{}{} fmt.Fprintf(b.out, " ---> Running in %s\n", utils.TruncateID(c.ID)) // override the entry point that may have been picked up from the base image c.Path = b.config.Cmd[0] c.Args = b.config.Cmd[1:] //start the container hostConfig := &HostConfig{} if err := c.Start(hostConfig); err != nil { return "", err } if b.verbose { err = <-c.Attach(nil, nil, b.out, b.out) if err != nil { return "", err } } // Wait for it to finish if ret := c.Wait(); ret != 0 { return "", fmt.Errorf("The command %v returned a non-zero code: %d", b.config.Cmd, ret) } return c.ID, nil } // Commit the container with the autorun command func (b *buildFile) commit(id string, autoCmd []string, comment string) error { if b.image == "" { return fmt.Errorf("Please provide a source image with `from` prior to commit") } b.config.Image = b.image if id == "" { cmd := b.config.Cmd b.config.Cmd = []string{"/bin/sh", "-c", "#(nop) " + comment} defer func(cmd []string) { b.config.Cmd = cmd }(cmd) if b.utilizeCache { if cache, err := b.srv.ImageGetCached(b.image, b.config); err != nil { return err } else if cache != nil { fmt.Fprintf(b.out, " ---> Using cache\n") utils.Debugf("[BUILDER] Use cached version") b.image = cache.ID return nil } else { utils.Debugf("[BUILDER] Cache miss") } } container, err := b.runtime.Create(b.config) if err != nil { return err } b.tmpContainers[container.ID] = struct{}{} fmt.Fprintf(b.out, " ---> Running in %s\n", utils.TruncateID(container.ID)) id = container.ID if err := container.EnsureMounted(); err != nil { return err } defer container.Unmount() } container := b.runtime.Get(id) if container == nil { return fmt.Errorf("An error occured while creating the container") } // Note: Actually copy the struct autoConfig := *b.config autoConfig.Cmd = autoCmd // Commit the container image, err := b.runtime.Commit(container, "", "", "", b.maintainer, &autoConfig) if err != nil { return err } b.tmpImages[image.ID] = struct{}{} b.image = image.ID return nil } // Long lines can be split with a backslash var lineContinuation = regexp.MustCompile(`\s*\\\s*\n`) func (b *buildFile) Build(context io.Reader) (string, error) { // FIXME: @creack any reason for using /tmp instead of ""? // FIXME: @creack "name" is a terrible variable name name, err := ioutil.TempDir("/tmp", "docker-build") if err != nil { return "", err } if err := Untar(context, name); err != nil { return "", err } defer os.RemoveAll(name) b.context = name filename := path.Join(name, "Dockerfile") if _, err := os.Stat(filename); os.IsNotExist(err) { return "", fmt.Errorf("Can't build a directory with no Dockerfile") } fileBytes, err := ioutil.ReadFile(filename) if err != nil { return "", err } dockerfile := string(fileBytes) dockerfile = lineContinuation.ReplaceAllString(dockerfile, "") stepN := 0 for _, line := range strings.Split(dockerfile, "\n") { line = strings.Trim(strings.Replace(line, "\t", " ", -1), " \t\r\n") // Skip comments and empty line if len(line) == 0 || line[0] == '#' { continue } tmp := strings.SplitN(line, " ", 2) if len(tmp) != 2 { return "", fmt.Errorf("Invalid Dockerfile format") } instruction := strings.ToLower(strings.Trim(tmp[0], " ")) arguments := strings.Trim(tmp[1], " ") method, exists := reflect.TypeOf(b).MethodByName("Cmd" + strings.ToUpper(instruction[:1]) + strings.ToLower(instruction[1:])) if !exists { fmt.Fprintf(b.out, "# Skipping unknown instruction %s\n", strings.ToUpper(instruction)) continue } stepN += 1 fmt.Fprintf(b.out, "Step %d : %s %s\n", stepN, strings.ToUpper(instruction), arguments) ret := method.Func.Call([]reflect.Value{reflect.ValueOf(b), reflect.ValueOf(arguments)})[0].Interface() if ret != nil { return "", ret.(error) } fmt.Fprintf(b.out, " ---> %v\n", utils.TruncateID(b.image)) } if b.image != "" { fmt.Fprintf(b.out, "Successfully built %s\n", utils.TruncateID(b.image)) if b.rm { b.clearTmp(b.tmpContainers) } return b.image, nil } return "", fmt.Errorf("An error occurred during the build\n") } func NewBuildFile(srv *Server, out io.Writer, verbose, utilizeCache, rm bool) BuildFile { return &buildFile{ runtime: srv.runtime, srv: srv, config: &Config{}, out: out, tmpContainers: make(map[string]struct{}), tmpImages: make(map[string]struct{}), verbose: verbose, utilizeCache: utilizeCache, rm: rm, } }