func (b *buildFile) clearTmp(containers map[string]struct{}) {
for c := range containers {
tmp := b.runtime.Get(c)
b.runtime.Destroy(tmp)
fmt.Fprintf(b.outStream, "Removing intermediate container %s\n", utils.TruncateID(c))
}
}
// Test that an image can be deleted by its shorthand prefix
func TestDeletePrefix(t *testing.T) {
graph, _ := tempGraph(t)
defer nukeGraph(graph)
img := createTestImage(graph, t)
if err := graph.Delete(utils.TruncateID(img.ID)); err != nil {
t.Fatal(err)
}
assertNImages(graph, t, 0)
}
func TestEnv(t *testing.T) {
os.Setenv("TRUE", "false")
os.Setenv("TRICKY", "tri\ncky\n")
runtime := mkRuntime(t)
defer nuke(runtime)
config, _, _, err := docker.ParseRun([]string{"-e=FALSE=true", "-e=TRUE", "-e=TRICKY", GetTestImage(runtime).ID, "env"}, nil)
if err != nil {
t.Fatal(err)
}
container, _, err := runtime.Create(config, "")
if err != nil {
t.Fatal(err)
}
defer runtime.Destroy(container)
stdout, err := container.StdoutPipe()
if err != nil {
t.Fatal(err)
}
defer stdout.Close()
if err := container.Start(); err != nil {
t.Fatal(err)
}
container.Wait()
output, err := ioutil.ReadAll(stdout)
if err != nil {
t.Fatal(err)
}
actualEnv := strings.Split(string(output), "\n")
if actualEnv[len(actualEnv)-1] == "" {
actualEnv = actualEnv[:len(actualEnv)-1]
}
sort.Strings(actualEnv)
goodEnv := []string{
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
"HOME=/",
"container=lxc",
"HOSTNAME=" + utils.TruncateID(container.ID),
"FALSE=true",
"TRUE=false",
"TRICKY=tri",
"cky",
"",
}
sort.Strings(goodEnv)
if len(goodEnv) != len(actualEnv) {
t.Fatalf("Wrong environment: should be %d variables, not: '%s'\n", len(goodEnv), strings.Join(actualEnv, ", "))
}
for i := range goodEnv {
if actualEnv[i] != goodEnv[i] {
t.Fatalf("Wrong environment variable: should be %s, not %s", goodEnv[i], actualEnv[i])
}
}
}
// During cleanup aufs needs to unmount all mountpoints
func (a *Driver) Cleanup() error {
ids, err := loadIds(path.Join(a.rootPath(), "layers"))
if err != nil {
return err
}
for _, id := range ids {
if err := a.unmount(id); err != nil {
utils.Errorf("Unmounting %s: %s", utils.TruncateID(id), err)
}
}
return nil
}
// Commit the container <id> with the autorun command <autoCmd>
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)
hit, err := b.probeCache()
if err != nil {
return err
}
if hit {
return nil
}
container, warnings, err := b.runtime.Create(b.config, "")
if err != nil {
return err
}
for _, warning := range warnings {
fmt.Fprintf(b.outStream, " ---> [Warning] %s\n", warning)
}
b.tmpContainers[container.ID] = struct{}{}
fmt.Fprintf(b.outStream, " ---> Running in %s\n", utils.TruncateID(container.ID))
id = container.ID
if err := container.Mount(); 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
}
func TestImagesViz(t *testing.T) {
stdout, stdoutPipe := io.Pipe()
cli := docker.NewDockerCli(nil, stdoutPipe, ioutil.Discard, testDaemonProto, testDaemonAddr)
defer cleanup(globalEngine, t)
image := buildTestImages(t, globalEngine)
c := make(chan struct{})
go func() {
defer close(c)
if err := cli.CmdImages("-viz"); err != nil {
t.Fatal(err)
}
stdoutPipe.Close()
}()
setTimeout(t, "Reading command output time out", 2*time.Second, func() {
cmdOutputBytes, err := ioutil.ReadAll(bufio.NewReader(stdout))
if err != nil {
t.Fatal(err)
}
cmdOutput := string(cmdOutputBytes)
regexpStrings := []string{
"digraph docker {",
fmt.Sprintf("base -> \"%s\" \\[style=invis]", unitTestImageIDShort),
fmt.Sprintf("label=\"%s\\\\n%s:latest\"", unitTestImageIDShort, unitTestImageName),
fmt.Sprintf("label=\"%s\\\\n%s:%s\"", utils.TruncateID(image.ID), "test", "latest"),
"base \\[style=invisible]",
}
compiledRegexps := []*regexp.Regexp{}
for _, regexpString := range regexpStrings {
regexp, err := regexp.Compile(regexpString)
if err != nil {
fmt.Println("Error in regex string: ", err)
return
}
compiledRegexps = append(compiledRegexps, regexp)
}
for _, regexp := range compiledRegexps {
if !regexp.MatchString(cmdOutput) {
t.Fatalf("images -viz content '%s' did not match regexp '%s'", cmdOutput, regexp)
}
}
})
}
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.outStream, " ---> 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:]
var errCh chan error
if b.verbose {
errCh = utils.Go(func() error {
return <-c.Attach(nil, nil, b.outStream, b.errStream)
})
}
//start the container
if err := c.Start(); err != nil {
return "", err
}
if errCh != nil {
if err := <-errCh; err != nil {
return "", err
}
}
// Wait for it to finish
if ret := c.Wait(); ret != 0 {
err := &utils.JSONError{
Message: fmt.Sprintf("The command %v returned a non-zero code: %d", b.config.Cmd, ret),
Code: ret,
}
return "", err
}
return c.ID, nil
}
func TestImagesTree(t *testing.T) {
stdout, stdoutPipe := io.Pipe()
cli := docker.NewDockerCli(nil, stdoutPipe, ioutil.Discard, testDaemonProto, testDaemonAddr)
defer cleanup(globalEngine, t)
image := buildTestImages(t, globalEngine)
c := make(chan struct{})
go func() {
defer close(c)
if err := cli.CmdImages("-tree"); err != nil {
t.Fatal(err)
}
stdoutPipe.Close()
}()
setTimeout(t, "Reading command output time out", 2*time.Second, func() {
cmdOutputBytes, err := ioutil.ReadAll(bufio.NewReader(stdout))
if err != nil {
t.Fatal(err)
}
cmdOutput := string(cmdOutputBytes)
regexpStrings := []string{
fmt.Sprintf("└─%s Virtual Size: \\d+.\\d+ MB Tags: %s:latest", unitTestImageIDShort, unitTestImageName),
"(?m) └─[0-9a-f]+.*",
"(?m) └─[0-9a-f]+.*",
"(?m) └─[0-9a-f]+.*",
fmt.Sprintf("(?m)^ └─%s Virtual Size: \\d+.\\d+ MB Tags: test:latest", utils.TruncateID(image.ID)),
}
compiledRegexps := []*regexp.Regexp{}
for _, regexpString := range regexpStrings {
regexp, err := regexp.Compile(regexpString)
if err != nil {
fmt.Println("Error in regex string: ", err)
return
}
compiledRegexps = append(compiledRegexps, regexp)
}
for _, regexp := range compiledRegexps {
if !regexp.MatchString(cmdOutput) {
t.Fatalf("images -tree content '%s' did not match regexp '%s'", cmdOutput, regexp)
}
}
})
}
func GenerateID() string {
for {
id := make([]byte, 32)
if _, err := io.ReadFull(rand.Reader, id); err != nil {
panic(err) // This shouldn't happen
}
value := hex.EncodeToString(id)
// if we try to parse the truncated for as an int and we don't have
// an error then the value is all numberic and causes issues when
// used as a hostname. ref #3869
if _, err := strconv.Atoi(utils.TruncateID(value)); err == nil {
continue
}
return value
}
}
func (runtime *Runtime) ensureName(container *Container) error {
if container.Name == "" {
name, err := generateRandomName(runtime)
if err != nil {
name = utils.TruncateID(container.ID)
}
container.Name = name
if err := container.ToDisk(); err != nil {
utils.Debugf("Error saving container name %s", err)
}
if !runtime.containerGraph.Exists(name) {
if _, err := runtime.containerGraph.Set(name, container.ID); err != nil {
utils.Debugf("Setting default id - %s", err)
}
}
}
return nil
}
func (container *Container) Kill() error {
if !container.State.IsRunning() {
return nil
}
// 1. Send SIGKILL
if err := container.kill(9); err != nil {
return err
}
// 2. Wait for the process to die, in last resort, try to kill the process directly
if err := container.WaitTimeout(10 * time.Second); err != nil {
if container.command == nil {
return fmt.Errorf("lxc-kill failed, impossible to kill the container %s", utils.TruncateID(container.ID))
}
log.Printf("Container %s failed to exit within 10 seconds of lxc-kill %s - trying direct SIGKILL", "SIGKILL", utils.TruncateID(container.ID))
if err := container.runtime.Kill(container, 9); err != nil {
return err
}
}
container.Wait()
return nil
}
func TestRuntimeCreate(t *testing.T) {
runtime := mkRuntime(t)
defer nuke(runtime)
// Make sure we start we 0 containers
if len(runtime.List()) != 0 {
t.Errorf("Expected 0 containers, %v found", len(runtime.List()))
}
container, _, err := runtime.Create(&docker.Config{
Image: GetTestImage(runtime).ID,
Cmd: []string{"ls", "-al"},
},
"",
)
if err != nil {
t.Fatal(err)
}
defer func() {
if err := runtime.Destroy(container); err != nil {
t.Error(err)
}
}()
// Make sure we can find the newly created container with List()
if len(runtime.List()) != 1 {
t.Errorf("Expected 1 container, %v found", len(runtime.List()))
}
// Make sure the container List() returns is the right one
if runtime.List()[0].ID != container.ID {
t.Errorf("Unexpected container %v returned by List", runtime.List()[0])
}
// Make sure we can get the container with Get()
if runtime.Get(container.ID) == nil {
t.Errorf("Unable to get newly created container")
}
// Make sure it is the right container
if runtime.Get(container.ID) != container {
t.Errorf("Get() returned the wrong container")
}
// Make sure Exists returns it as existing
if !runtime.Exists(container.ID) {
t.Errorf("Exists() returned false for a newly created container")
}
// Test that conflict error displays correct details
testContainer, _, _ := runtime.Create(
&docker.Config{
Image: GetTestImage(runtime).ID,
Cmd: []string{"ls", "-al"},
},
"conflictname",
)
if _, _, err := runtime.Create(&docker.Config{Image: GetTestImage(runtime).ID, Cmd: []string{"ls", "-al"}}, testContainer.Name); err == nil || !strings.Contains(err.Error(), utils.TruncateID(testContainer.ID)) {
t.Fatalf("Name conflict error doesn't include the correct short id. Message was: %s", err.Error())
}
// Make sure create with bad parameters returns an error
if _, _, err = runtime.Create(&docker.Config{Image: GetTestImage(runtime).ID}, ""); err == nil {
t.Fatal("Builder.Create should throw an error when Cmd is missing")
}
if _, _, err := runtime.Create(
&docker.Config{
Image: GetTestImage(runtime).ID,
Cmd: []string{},
},
"",
); err == nil {
t.Fatal("Builder.Create should throw an error when Cmd is empty")
}
config := &docker.Config{
Image: GetTestImage(runtime).ID,
Cmd: []string{"/bin/ls"},
PortSpecs: []string{"80"},
}
container, _, err = runtime.Create(config, "")
_, err = runtime.Commit(container, "testrepo", "testtag", "", "", config)
if err != nil {
t.Error(err)
}
// test expose 80:8000
container, warnings, err := runtime.Create(&docker.Config{
Image: GetTestImage(runtime).ID,
Cmd: []string{"ls", "-al"},
PortSpecs: []string{"80:8000"},
},
"",
)
if err != nil {
t.Fatal(err)
}
if warnings == nil || len(warnings) != 1 {
t.Error("Expected a warning, got none")
}
}
// TempLayerArchive creates a temporary archive of the given image's filesystem layer.
// The archive is stored on disk and will be automatically deleted as soon as has been read.
// If output is not nil, a human-readable progress bar will be written to it.
// FIXME: does this belong in Graph? How about MktempFile, let the caller use it for archives?
func (graph *Graph) TempLayerArchive(id string, compression archive.Compression, sf *utils.StreamFormatter, output io.Writer) (*archive.TempArchive, error) {
image, err := graph.Get(id)
if err != nil {
return nil, err
}
tmp, err := graph.Mktemp("")
if err != nil {
return nil, err
}
a, err := image.TarLayer()
if err != nil {
return nil, err
}
return archive.NewTempArchive(utils.ProgressReader(ioutil.NopCloser(a), 0, output, sf, false, utils.TruncateID(id), "Buffering to disk"), tmp)
}
// TestAttachDetachTruncatedID checks that attach in tty mode can be detached
func TestAttachDetachTruncatedID(t *testing.T) {
stdin, stdinPipe := io.Pipe()
stdout, stdoutPipe := io.Pipe()
cli := docker.NewDockerCli(stdin, stdoutPipe, ioutil.Discard, testDaemonProto, testDaemonAddr)
defer cleanup(globalEngine, t)
// Discard the CmdRun output
go stdout.Read(make([]byte, 1024))
setTimeout(t, "Starting container timed out", 2*time.Second, func() {
if err := cli.CmdRun("-i", "-t", "-d", unitTestImageID, "cat"); err != nil {
t.Fatal(err)
}
})
container := waitContainerStart(t, 10*time.Second)
state := setRaw(t, container)
defer unsetRaw(t, container, state)
stdin, stdinPipe = io.Pipe()
stdout, stdoutPipe = io.Pipe()
cli = docker.NewDockerCli(stdin, stdoutPipe, ioutil.Discard, testDaemonProto, testDaemonAddr)
ch := make(chan struct{})
go func() {
defer close(ch)
if err := cli.CmdAttach(utils.TruncateID(container.ID)); err != nil {
if err != io.ErrClosedPipe {
t.Fatal(err)
}
}
}()
setTimeout(t, "First read/write assertion timed out", 2*time.Second, func() {
if err := assertPipe("hello\n", "hello", stdout, stdinPipe, 150); err != nil {
if err != io.ErrClosedPipe {
t.Fatal(err)
}
}
})
setTimeout(t, "Escape sequence timeout", 5*time.Second, func() {
stdinPipe.Write([]byte{16})
time.Sleep(100 * time.Millisecond)
stdinPipe.Write([]byte{17})
})
// wait for CmdRun to return
setTimeout(t, "Waiting for CmdAttach timed out", 15*time.Second, func() {
<-ch
})
closeWrap(stdin, stdinPipe, stdout, stdoutPipe)
time.Sleep(500 * time.Millisecond)
if !container.State.IsRunning() {
t.Fatal("The detached container should be still running")
}
setTimeout(t, "Waiting for container to die timedout", 5*time.Second, func() {
container.Kill()
})
}
func (b *buildFile) Build(context io.Reader) (string, error) {
tmpdirPath, err := ioutil.TempDir("", "docker-build")
if err != nil {
return "", err
}
decompressedStream, err := archive.DecompressStream(context)
if err != nil {
return "", err
}
b.context = &utils.TarSum{Reader: decompressedStream, DisableCompression: true}
if err := archive.Untar(b.context, tmpdirPath, nil); err != nil {
return "", err
}
defer os.RemoveAll(tmpdirPath)
b.contextPath = tmpdirPath
filename := path.Join(tmpdirPath, "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
}
if len(fileBytes) == 0 {
return "", ErrDockerfileEmpty
}
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.errStream, "# Skipping unknown instruction %s\n", strings.ToUpper(instruction))
continue
}
stepN += 1
fmt.Fprintf(b.outStream, "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.outStream, " ---> %s\n", utils.TruncateID(b.image))
}
if b.image != "" {
fmt.Fprintf(b.outStream, "Successfully built %s\n", utils.TruncateID(b.image))
if b.rm {
b.clearTmp(b.tmpContainers)
}
return b.image, nil
}
return "", fmt.Errorf("No image was generated. This may be because the Dockerfile does not, like, do anything.\n")
}
func (runtime *Runtime) restore() error {
if os.Getenv("DEBUG") == "" && os.Getenv("TEST") == "" {
fmt.Printf("Loading containers: ")
}
dir, err := ioutil.ReadDir(runtime.repository)
if err != nil {
return err
}
containers := make(map[string]*Container)
currentDriver := runtime.driver.String()
for _, v := range dir {
id := v.Name()
container, err := runtime.load(id)
if os.Getenv("DEBUG") == "" && os.Getenv("TEST") == "" {
fmt.Print(".")
}
if err != nil {
utils.Errorf("Failed to load container %v: %v", id, err)
continue
}
// Ignore the container if it does not support the current driver being used by the graph
if container.Driver == "" && currentDriver == "aufs" || container.Driver == currentDriver {
utils.Debugf("Loaded container %v", container.ID)
containers[container.ID] = container
} else {
utils.Debugf("Cannot load container %s because it was created with another graph driver.", container.ID)
}
}
register := func(container *Container) {
if err := runtime.Register(container); err != nil {
utils.Debugf("Failed to register container %s: %s", container.ID, err)
}
}
if entities := runtime.containerGraph.List("/", -1); entities != nil {
for _, p := range entities.Paths() {
if os.Getenv("DEBUG") == "" && os.Getenv("TEST") == "" {
fmt.Print(".")
}
e := entities[p]
if container, ok := containers[e.ID()]; ok {
register(container)
delete(containers, e.ID())
}
}
}
// Any containers that are left over do not exist in the graph
for _, container := range containers {
// Try to set the default name for a container if it exists prior to links
container.Name, err = generateRandomName(runtime)
if err != nil {
container.Name = utils.TruncateID(container.ID)
}
if _, err := runtime.containerGraph.Set(container.Name, container.ID); err != nil {
utils.Debugf("Setting default id - %s", err)
}
register(container)
}
if os.Getenv("DEBUG") == "" && os.Getenv("TEST") == "" {
fmt.Printf(": done.\n")
}
return nil
}
// Create creates a new container from the given configuration with a given name.
func (runtime *Runtime) Create(config *Config, name string) (*Container, []string, error) {
// Lookup image
img, err := runtime.repositories.LookupImage(config.Image)
if err != nil {
return nil, nil, err
}
// We add 2 layers to the depth because the container's rw and
// init layer add to the restriction
depth, err := img.Depth()
if err != nil {
return nil, nil, err
}
if depth+2 >= MaxImageDepth {
return nil, nil, fmt.Errorf("Cannot create container with more than %d parents", MaxImageDepth)
}
checkDeprecatedExpose := func(config *Config) bool {
if config != nil {
if config.PortSpecs != nil {
for _, p := range config.PortSpecs {
if strings.Contains(p, ":") {
return true
}
}
}
}
return false
}
warnings := []string{}
if checkDeprecatedExpose(img.Config) || checkDeprecatedExpose(config) {
warnings = append(warnings, "The mapping to public ports on your host has been deprecated. Use -p to publish the ports.")
}
if img.Config != nil {
if err := MergeConfig(config, img.Config); err != nil {
return nil, nil, err
}
}
if len(config.Entrypoint) != 0 && config.Cmd == nil {
config.Cmd = []string{}
} else if config.Cmd == nil || len(config.Cmd) == 0 {
return nil, nil, fmt.Errorf("No command specified")
}
// Generate id
id := GenerateID()
if name == "" {
name, err = generateRandomName(runtime)
if err != nil {
name = utils.TruncateID(id)
}
} else {
if !validContainerNamePattern.MatchString(name) {
return nil, nil, fmt.Errorf("Invalid container name (%s), only %s are allowed", name, validContainerNameChars)
}
}
if name[0] != '/' {
name = "/" + name
}
// Set the enitity in the graph using the default name specified
if _, err := runtime.containerGraph.Set(name, id); err != nil {
if !strings.HasSuffix(err.Error(), "name are not unique") {
return nil, nil, err
}
conflictingContainer, err := runtime.GetByName(name)
if err != nil {
if strings.Contains(err.Error(), "Could not find entity") {
return nil, nil, err
}
// Remove name and continue starting the container
if err := runtime.containerGraph.Delete(name); err != nil {
return nil, nil, err
}
} else {
nameAsKnownByUser := strings.TrimPrefix(name, "/")
return nil, nil, fmt.Errorf(
"Conflict, The name %s is already assigned to %s. You have to delete (or rename) that container to be able to assign %s to a container again.", nameAsKnownByUser,
utils.TruncateID(conflictingContainer.ID), nameAsKnownByUser)
}
}
// Generate default hostname
// FIXME: the lxc template no longer needs to set a default hostname
if config.Hostname == "" {
config.Hostname = id[:12]
}
var args []string
var entrypoint string
if len(config.Entrypoint) != 0 {
entrypoint = config.Entrypoint[0]
args = append(config.Entrypoint[1:], config.Cmd...)
} else {
entrypoint = config.Cmd[0]
args = config.Cmd[1:]
}
container := &Container{
// FIXME: we should generate the ID here instead of receiving it as an argument
ID: id,
Created: time.Now().UTC(),
Path: entrypoint,
Args: args, //FIXME: de-duplicate from config
Config: config,
hostConfig: &HostConfig{},
Image: img.ID, // Always use the resolved image id
NetworkSettings: &NetworkSettings{},
Name: name,
Driver: runtime.driver.String(),
}
container.root = runtime.containerRoot(container.ID)
// Step 1: create the container directory.
// This doubles as a barrier to avoid race conditions.
if err := os.Mkdir(container.root, 0700); err != nil {
return nil, nil, err
}
initID := fmt.Sprintf("%s-init", container.ID)
if err := runtime.driver.Create(initID, img.ID); err != nil {
return nil, nil, err
}
initPath, err := runtime.driver.Get(initID)
if err != nil {
return nil, nil, err
}
defer runtime.driver.Put(initID)
if err := setupInitLayer(initPath); err != nil {
return nil, nil, err
}
if err := runtime.driver.Create(container.ID, initID); err != nil {
return nil, nil, err
}
resolvConf, err := utils.GetResolvConf()
if err != nil {
return nil, nil, err
}
if len(config.Dns) == 0 && len(runtime.config.Dns) == 0 && utils.CheckLocalDns(resolvConf) {
//"WARNING: Docker detected local DNS server on resolv.conf. Using default external servers: %v", defaultDns
runtime.config.Dns = defaultDns
}
// If custom dns exists, then create a resolv.conf for the container
if len(config.Dns) > 0 || len(runtime.config.Dns) > 0 {
var dns []string
if len(config.Dns) > 0 {
dns = config.Dns
} else {
dns = runtime.config.Dns
}
container.ResolvConfPath = path.Join(container.root, "resolv.conf")
f, err := os.Create(container.ResolvConfPath)
if err != nil {
return nil, nil, err
}
defer f.Close()
for _, dns := range dns {
if _, err := f.Write([]byte("nameserver " + dns + "\n")); err != nil {
return nil, nil, err
}
}
} else {
container.ResolvConfPath = "/etc/resolv.conf"
}
// Step 2: save the container json
if err := container.ToDisk(); err != nil {
return nil, nil, err
}
// Step 3: register the container
if err := runtime.Register(container); err != nil {
return nil, nil, err
}
return container, warnings, nil
}
func (store *TagStore) ImageName(id string) string {
if names, exists := store.ByID()[id]; exists && len(names) > 0 {
return names[0]
}
return utils.TruncateID(id)
}