1182 lines
30 KiB
Go
1182 lines
30 KiB
Go
package daemon
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import (
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"encoding/json"
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"errors"
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"fmt"
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"github.com/dotcloud/docker/archive"
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"github.com/dotcloud/docker/daemon/execdriver"
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"github.com/dotcloud/docker/daemon/graphdriver"
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"github.com/dotcloud/docker/engine"
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"github.com/dotcloud/docker/image"
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"github.com/dotcloud/docker/links"
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"github.com/dotcloud/docker/nat"
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"github.com/dotcloud/docker/runconfig"
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"github.com/dotcloud/docker/utils"
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"io"
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"io/ioutil"
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"log"
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"os"
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"path"
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"strings"
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"sync"
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"syscall"
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"time"
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)
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const DefaultPathEnv = "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
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var (
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ErrNotATTY = errors.New("The PTY is not a file")
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ErrNoTTY = errors.New("No PTY found")
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ErrContainerStart = errors.New("The container failed to start. Unknown error")
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ErrContainerStartTimeout = errors.New("The container failed to start due to timed out.")
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)
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type Container struct {
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sync.Mutex
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root string // Path to the "home" of the container, including metadata.
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basefs string // Path to the graphdriver mountpoint
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ID string
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Created time.Time
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Path string
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Args []string
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Config *runconfig.Config
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State State
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Image string
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NetworkSettings *NetworkSettings
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ResolvConfPath string
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HostnamePath string
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HostsPath string
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Name string
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Driver string
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ExecDriver string
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command *execdriver.Command
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stdout *utils.WriteBroadcaster
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stderr *utils.WriteBroadcaster
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stdin io.ReadCloser
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stdinPipe io.WriteCloser
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daemon *Daemon
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waitLock chan struct{}
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Volumes map[string]string
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// Store rw/ro in a separate structure to preserve reverse-compatibility on-disk.
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// Easier than migrating older container configs :)
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VolumesRW map[string]bool
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hostConfig *runconfig.HostConfig
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activeLinks map[string]*links.Link
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}
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// Inject the io.Reader at the given path. Note: do not close the reader
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func (container *Container) Inject(file io.Reader, pth string) error {
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if err := container.Mount(); err != nil {
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return fmt.Errorf("inject: error mounting container %s: %s", container.ID, err)
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}
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defer container.Unmount()
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// Return error if path exists
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destPath := path.Join(container.basefs, pth)
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if _, err := os.Stat(destPath); err == nil {
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// Since err is nil, the path could be stat'd and it exists
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return fmt.Errorf("%s exists", pth)
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} else if !os.IsNotExist(err) {
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// Expect err might be that the file doesn't exist, so
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// if it's some other error, return that.
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return err
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}
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// Make sure the directory exists
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if err := os.MkdirAll(path.Join(container.basefs, path.Dir(pth)), 0755); err != nil {
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return err
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}
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dest, err := os.Create(destPath)
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if err != nil {
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return err
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}
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defer dest.Close()
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if _, err := io.Copy(dest, file); err != nil {
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return err
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}
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return nil
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}
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func (container *Container) FromDisk() error {
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data, err := ioutil.ReadFile(container.jsonPath())
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if err != nil {
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return err
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}
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// Load container settings
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// udp broke compat of docker.PortMapping, but it's not used when loading a container, we can skip it
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if err := json.Unmarshal(data, container); err != nil && !strings.Contains(err.Error(), "docker.PortMapping") {
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return err
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}
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return container.readHostConfig()
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}
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func (container *Container) ToDisk() (err error) {
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data, err := json.Marshal(container)
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if err != nil {
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return
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}
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err = ioutil.WriteFile(container.jsonPath(), data, 0666)
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if err != nil {
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return
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}
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return container.WriteHostConfig()
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}
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func (container *Container) readHostConfig() error {
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container.hostConfig = &runconfig.HostConfig{}
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// If the hostconfig file does not exist, do not read it.
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// (We still have to initialize container.hostConfig,
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// but that's OK, since we just did that above.)
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_, err := os.Stat(container.hostConfigPath())
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if os.IsNotExist(err) {
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return nil
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}
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data, err := ioutil.ReadFile(container.hostConfigPath())
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if err != nil {
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return err
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}
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return json.Unmarshal(data, container.hostConfig)
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}
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func (container *Container) WriteHostConfig() (err error) {
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data, err := json.Marshal(container.hostConfig)
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if err != nil {
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return
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}
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return ioutil.WriteFile(container.hostConfigPath(), data, 0666)
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}
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func (container *Container) generateEnvConfig(env []string) error {
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data, err := json.Marshal(env)
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if err != nil {
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return err
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}
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p, err := container.EnvConfigPath()
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if err != nil {
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return err
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}
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ioutil.WriteFile(p, data, 0600)
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return nil
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}
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func (container *Container) Attach(stdin io.ReadCloser, stdinCloser io.Closer, stdout io.Writer, stderr io.Writer) chan error {
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var cStdout, cStderr io.ReadCloser
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var nJobs int
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errors := make(chan error, 3)
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if stdin != nil && container.Config.OpenStdin {
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nJobs += 1
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if cStdin, err := container.StdinPipe(); err != nil {
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errors <- err
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} else {
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go func() {
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utils.Debugf("attach: stdin: begin")
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defer utils.Debugf("attach: stdin: end")
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// No matter what, when stdin is closed (io.Copy unblock), close stdout and stderr
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if container.Config.StdinOnce && !container.Config.Tty {
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defer cStdin.Close()
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} else {
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defer func() {
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if cStdout != nil {
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cStdout.Close()
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}
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if cStderr != nil {
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cStderr.Close()
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}
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}()
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}
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if container.Config.Tty {
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_, err = utils.CopyEscapable(cStdin, stdin)
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} else {
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_, err = io.Copy(cStdin, stdin)
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}
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if err == io.ErrClosedPipe {
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err = nil
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}
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if err != nil {
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utils.Errorf("attach: stdin: %s", err)
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}
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errors <- err
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}()
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}
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}
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if stdout != nil {
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nJobs += 1
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if p, err := container.StdoutPipe(); err != nil {
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errors <- err
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} else {
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cStdout = p
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go func() {
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utils.Debugf("attach: stdout: begin")
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defer utils.Debugf("attach: stdout: end")
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// If we are in StdinOnce mode, then close stdin
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if container.Config.StdinOnce && stdin != nil {
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defer stdin.Close()
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}
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if stdinCloser != nil {
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defer stdinCloser.Close()
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}
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_, err := io.Copy(stdout, cStdout)
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if err == io.ErrClosedPipe {
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err = nil
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}
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if err != nil {
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utils.Errorf("attach: stdout: %s", err)
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}
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errors <- err
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}()
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}
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} else {
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go func() {
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if stdinCloser != nil {
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defer stdinCloser.Close()
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}
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if cStdout, err := container.StdoutPipe(); err != nil {
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utils.Errorf("attach: stdout pipe: %s", err)
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} else {
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io.Copy(&utils.NopWriter{}, cStdout)
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}
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}()
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}
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if stderr != nil {
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nJobs += 1
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if p, err := container.StderrPipe(); err != nil {
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errors <- err
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} else {
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cStderr = p
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go func() {
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utils.Debugf("attach: stderr: begin")
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defer utils.Debugf("attach: stderr: end")
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// If we are in StdinOnce mode, then close stdin
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if container.Config.StdinOnce && stdin != nil {
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defer stdin.Close()
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}
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if stdinCloser != nil {
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defer stdinCloser.Close()
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}
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_, err := io.Copy(stderr, cStderr)
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if err == io.ErrClosedPipe {
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err = nil
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}
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if err != nil {
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utils.Errorf("attach: stderr: %s", err)
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}
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errors <- err
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}()
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}
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} else {
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go func() {
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if stdinCloser != nil {
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defer stdinCloser.Close()
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}
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if cStderr, err := container.StderrPipe(); err != nil {
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utils.Errorf("attach: stdout pipe: %s", err)
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} else {
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io.Copy(&utils.NopWriter{}, cStderr)
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}
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}()
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}
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return utils.Go(func() error {
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defer func() {
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if cStdout != nil {
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cStdout.Close()
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}
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if cStderr != nil {
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cStderr.Close()
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}
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}()
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// FIXME: how to clean up the stdin goroutine without the unwanted side effect
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// of closing the passed stdin? Add an intermediary io.Pipe?
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for i := 0; i < nJobs; i += 1 {
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utils.Debugf("attach: waiting for job %d/%d", i+1, nJobs)
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if err := <-errors; err != nil {
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utils.Errorf("attach: job %d returned error %s, aborting all jobs", i+1, err)
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return err
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}
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utils.Debugf("attach: job %d completed successfully", i+1)
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}
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utils.Debugf("attach: all jobs completed successfully")
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return nil
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})
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}
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func populateCommand(c *Container, env []string) {
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var (
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en *execdriver.Network
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driverConfig = make(map[string][]string)
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)
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en = &execdriver.Network{
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Mtu: c.daemon.config.Mtu,
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Interface: nil,
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}
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if !c.Config.NetworkDisabled {
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network := c.NetworkSettings
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en.Interface = &execdriver.NetworkInterface{
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Gateway: network.Gateway,
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Bridge: network.Bridge,
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IPAddress: network.IPAddress,
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IPPrefixLen: network.IPPrefixLen,
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}
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}
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// TODO: this can be removed after lxc-conf is fully deprecated
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mergeLxcConfIntoOptions(c.hostConfig, driverConfig)
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resources := &execdriver.Resources{
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Memory: c.Config.Memory,
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MemorySwap: c.Config.MemorySwap,
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CpuShares: c.Config.CpuShares,
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}
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c.command = &execdriver.Command{
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ID: c.ID,
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Privileged: c.hostConfig.Privileged,
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Rootfs: c.RootfsPath(),
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InitPath: "/.dockerinit",
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Entrypoint: c.Path,
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Arguments: c.Args,
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WorkingDir: c.Config.WorkingDir,
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Network: en,
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Tty: c.Config.Tty,
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User: c.Config.User,
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Config: driverConfig,
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Resources: resources,
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}
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c.command.SysProcAttr = &syscall.SysProcAttr{Setsid: true}
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c.command.Env = env
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}
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func (container *Container) Start() (err error) {
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container.Lock()
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defer container.Unlock()
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if container.State.IsRunning() {
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return nil
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}
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// if we encounter and error during start we need to ensure that any other
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// setup has been cleaned up properly
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defer func() {
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if err != nil {
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container.cleanup()
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}
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}()
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if err := container.setupContainerDns(); err != nil {
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return err
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}
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if err := container.Mount(); err != nil {
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return err
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}
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if err := container.initializeNetworking(); err != nil {
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return err
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}
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container.verifyDaemonSettings()
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if err := prepareVolumesForContainer(container); err != nil {
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return err
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}
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linkedEnv, err := container.setupLinkedContainers()
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if err != nil {
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return err
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}
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env := container.createDaemonEnvironment(linkedEnv)
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// TODO: This is only needed for lxc so we should look for a way to
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// remove this dep
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if err := container.generateEnvConfig(env); err != nil {
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return err
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}
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if err := container.setupWorkingDirectory(); err != nil {
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return err
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}
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populateCommand(container, env)
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if err := setupMountsForContainer(container); err != nil {
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return err
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}
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if err := container.startLoggingToDisk(); err != nil {
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return err
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}
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container.waitLock = make(chan struct{})
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return container.waitForStart()
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}
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func (container *Container) Run() error {
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if err := container.Start(); err != nil {
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return err
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}
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container.Wait()
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return nil
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}
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func (container *Container) Output() (output []byte, err error) {
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pipe, err := container.StdoutPipe()
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if err != nil {
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return nil, err
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}
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defer pipe.Close()
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if err := container.Start(); err != nil {
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return nil, err
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}
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output, err = ioutil.ReadAll(pipe)
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container.Wait()
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return output, err
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}
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// Container.StdinPipe returns a WriteCloser which can be used to feed data
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// to the standard input of the container's active process.
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// Container.StdoutPipe and Container.StderrPipe each return a ReadCloser
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// which can be used to retrieve the standard output (and error) generated
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// by the container's active process. The output (and error) are actually
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// copied and delivered to all StdoutPipe and StderrPipe consumers, using
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// a kind of "broadcaster".
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func (container *Container) StdinPipe() (io.WriteCloser, error) {
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return container.stdinPipe, nil
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}
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func (container *Container) StdoutPipe() (io.ReadCloser, error) {
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reader, writer := io.Pipe()
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container.stdout.AddWriter(writer, "")
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return utils.NewBufReader(reader), nil
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}
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func (container *Container) StderrPipe() (io.ReadCloser, error) {
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reader, writer := io.Pipe()
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container.stderr.AddWriter(writer, "")
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return utils.NewBufReader(reader), nil
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}
|
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|
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func (container *Container) buildHostnameAndHostsFiles(IP string) {
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container.HostnamePath = path.Join(container.root, "hostname")
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ioutil.WriteFile(container.HostnamePath, []byte(container.Config.Hostname+"\n"), 0644)
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|
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hostsContent := []byte(`
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127.0.0.1 localhost
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::1 localhost ip6-localhost ip6-loopback
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fe00::0 ip6-localnet
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ff00::0 ip6-mcastprefix
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ff02::1 ip6-allnodes
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ff02::2 ip6-allrouters
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`)
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|
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container.HostsPath = path.Join(container.root, "hosts")
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|
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if container.Config.Domainname != "" {
|
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hostsContent = append([]byte(fmt.Sprintf("%s\t%s.%s %s\n", IP, container.Config.Hostname, container.Config.Domainname, container.Config.Hostname)), hostsContent...)
|
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} else if !container.Config.NetworkDisabled {
|
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hostsContent = append([]byte(fmt.Sprintf("%s\t%s\n", IP, container.Config.Hostname)), hostsContent...)
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}
|
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|
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ioutil.WriteFile(container.HostsPath, hostsContent, 0644)
|
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}
|
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|
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func (container *Container) allocateNetwork() error {
|
|
if container.Config.NetworkDisabled {
|
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return nil
|
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}
|
|
|
|
var (
|
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env *engine.Env
|
|
err error
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eng = container.daemon.eng
|
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)
|
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|
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job := eng.Job("allocate_interface", container.ID)
|
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if env, err = job.Stdout.AddEnv(); err != nil {
|
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return err
|
|
}
|
|
if err := job.Run(); err != nil {
|
|
return err
|
|
}
|
|
|
|
if container.Config.PortSpecs != nil {
|
|
if err := migratePortMappings(container.Config, container.hostConfig); err != nil {
|
|
return err
|
|
}
|
|
container.Config.PortSpecs = nil
|
|
if err := container.WriteHostConfig(); err != nil {
|
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return err
|
|
}
|
|
}
|
|
|
|
var (
|
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portSpecs = make(nat.PortSet)
|
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bindings = make(nat.PortMap)
|
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)
|
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|
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if container.Config.ExposedPorts != nil {
|
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portSpecs = container.Config.ExposedPorts
|
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}
|
|
if container.hostConfig.PortBindings != nil {
|
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bindings = container.hostConfig.PortBindings
|
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}
|
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|
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container.NetworkSettings.PortMapping = nil
|
|
|
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for port := range portSpecs {
|
|
if err := container.allocatePort(eng, port, bindings); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
container.WriteHostConfig()
|
|
|
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container.NetworkSettings.Ports = bindings
|
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container.NetworkSettings.Bridge = env.Get("Bridge")
|
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container.NetworkSettings.IPAddress = env.Get("IP")
|
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container.NetworkSettings.IPPrefixLen = env.GetInt("IPPrefixLen")
|
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container.NetworkSettings.Gateway = env.Get("Gateway")
|
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|
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return nil
|
|
}
|
|
|
|
func (container *Container) releaseNetwork() {
|
|
if container.Config.NetworkDisabled {
|
|
return
|
|
}
|
|
eng := container.daemon.eng
|
|
|
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eng.Job("release_interface", container.ID).Run()
|
|
container.NetworkSettings = &NetworkSettings{}
|
|
}
|
|
|
|
func (container *Container) monitor(callback execdriver.StartCallback) error {
|
|
var (
|
|
err error
|
|
exitCode int
|
|
)
|
|
|
|
pipes := execdriver.NewPipes(container.stdin, container.stdout, container.stderr, container.Config.OpenStdin)
|
|
exitCode, err = container.daemon.Run(container, pipes, callback)
|
|
if err != nil {
|
|
utils.Errorf("Error running container: %s", err)
|
|
}
|
|
|
|
if container.daemon != nil && container.daemon.srv != nil && container.daemon.srv.IsRunning() {
|
|
container.State.SetStopped(exitCode)
|
|
|
|
// FIXME: there is a race condition here which causes this to fail during the unit tests.
|
|
// If another goroutine was waiting for Wait() to return before removing the container's root
|
|
// from the filesystem... At this point it may already have done so.
|
|
// This is because State.setStopped() has already been called, and has caused Wait()
|
|
// to return.
|
|
// FIXME: why are we serializing running state to disk in the first place?
|
|
//log.Printf("%s: Failed to dump configuration to the disk: %s", container.ID, err)
|
|
if err := container.ToDisk(); err != nil {
|
|
utils.Errorf("Error dumping container state to disk: %s\n", err)
|
|
}
|
|
}
|
|
|
|
// Cleanup
|
|
container.cleanup()
|
|
|
|
// Re-create a brand new stdin pipe once the container exited
|
|
if container.Config.OpenStdin {
|
|
container.stdin, container.stdinPipe = io.Pipe()
|
|
}
|
|
|
|
if container.daemon != nil && container.daemon.srv != nil {
|
|
container.daemon.srv.LogEvent("die", container.ID, container.daemon.repositories.ImageName(container.Image))
|
|
}
|
|
|
|
close(container.waitLock)
|
|
|
|
return err
|
|
}
|
|
|
|
func (container *Container) cleanup() {
|
|
container.releaseNetwork()
|
|
|
|
// Disable all active links
|
|
if container.activeLinks != nil {
|
|
for _, link := range container.activeLinks {
|
|
link.Disable()
|
|
}
|
|
}
|
|
if container.Config.OpenStdin {
|
|
if err := container.stdin.Close(); err != nil {
|
|
utils.Errorf("%s: Error close stdin: %s", container.ID, err)
|
|
}
|
|
}
|
|
if err := container.stdout.CloseWriters(); err != nil {
|
|
utils.Errorf("%s: Error close stdout: %s", container.ID, err)
|
|
}
|
|
if err := container.stderr.CloseWriters(); err != nil {
|
|
utils.Errorf("%s: Error close stderr: %s", container.ID, err)
|
|
}
|
|
if container.command != nil && container.command.Terminal != nil {
|
|
if err := container.command.Terminal.Close(); err != nil {
|
|
utils.Errorf("%s: Error closing terminal: %s", container.ID, err)
|
|
}
|
|
}
|
|
|
|
if err := container.Unmount(); err != nil {
|
|
log.Printf("%v: Failed to umount filesystem: %v", container.ID, err)
|
|
}
|
|
}
|
|
|
|
func (container *Container) KillSig(sig int) error {
|
|
container.Lock()
|
|
defer container.Unlock()
|
|
|
|
if !container.State.IsRunning() {
|
|
return nil
|
|
}
|
|
return container.daemon.Kill(container, sig)
|
|
}
|
|
|
|
func (container *Container) Kill() error {
|
|
if !container.State.IsRunning() {
|
|
return nil
|
|
}
|
|
|
|
// 1. Send SIGKILL
|
|
if err := container.KillSig(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 {
|
|
log.Printf("Container %s failed to exit within 10 seconds of kill - trying direct SIGKILL", utils.TruncateID(container.ID))
|
|
if err := syscall.Kill(container.State.Pid, 9); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
container.Wait()
|
|
return nil
|
|
}
|
|
|
|
func (container *Container) Stop(seconds int) error {
|
|
if !container.State.IsRunning() {
|
|
return nil
|
|
}
|
|
|
|
// 1. Send a SIGTERM
|
|
if err := container.KillSig(15); err != nil {
|
|
log.Print("Failed to send SIGTERM to the process, force killing")
|
|
if err := container.KillSig(9); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
// 2. Wait for the process to exit on its own
|
|
if err := container.WaitTimeout(time.Duration(seconds) * time.Second); err != nil {
|
|
log.Printf("Container %v failed to exit within %d seconds of SIGTERM - using the force", container.ID, seconds)
|
|
// 3. If it doesn't, then send SIGKILL
|
|
if err := container.Kill(); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (container *Container) Restart(seconds int) error {
|
|
// Avoid unnecessarily unmounting and then directly mounting
|
|
// the container when the container stops and then starts
|
|
// again
|
|
if err := container.Mount(); err == nil {
|
|
defer container.Unmount()
|
|
}
|
|
|
|
if err := container.Stop(seconds); err != nil {
|
|
return err
|
|
}
|
|
return container.Start()
|
|
}
|
|
|
|
// Wait blocks until the container stops running, then returns its exit code.
|
|
func (container *Container) Wait() int {
|
|
<-container.waitLock
|
|
return container.State.GetExitCode()
|
|
}
|
|
|
|
func (container *Container) Resize(h, w int) error {
|
|
return container.command.Terminal.Resize(h, w)
|
|
}
|
|
|
|
func (container *Container) ExportRw() (archive.Archive, error) {
|
|
if err := container.Mount(); err != nil {
|
|
return nil, err
|
|
}
|
|
if container.daemon == nil {
|
|
return nil, fmt.Errorf("Can't load storage driver for unregistered container %s", container.ID)
|
|
}
|
|
archive, err := container.daemon.Diff(container)
|
|
if err != nil {
|
|
container.Unmount()
|
|
return nil, err
|
|
}
|
|
return utils.NewReadCloserWrapper(archive, func() error {
|
|
err := archive.Close()
|
|
container.Unmount()
|
|
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
|
|
}
|
|
|
|
func (container *Container) WaitTimeout(timeout time.Duration) error {
|
|
done := make(chan bool)
|
|
go func() {
|
|
container.Wait()
|
|
done <- true
|
|
}()
|
|
|
|
select {
|
|
case <-time.After(timeout):
|
|
return fmt.Errorf("Timed Out")
|
|
case <-done:
|
|
return nil
|
|
}
|
|
}
|
|
|
|
func (container *Container) Mount() error {
|
|
return container.daemon.Mount(container)
|
|
}
|
|
|
|
func (container *Container) Changes() ([]archive.Change, error) {
|
|
return container.daemon.Changes(container)
|
|
}
|
|
|
|
func (container *Container) GetImage() (*image.Image, error) {
|
|
if container.daemon == nil {
|
|
return nil, fmt.Errorf("Can't get image of unregistered container")
|
|
}
|
|
return container.daemon.graph.Get(container.Image)
|
|
}
|
|
|
|
func (container *Container) Unmount() error {
|
|
return container.daemon.Unmount(container)
|
|
}
|
|
|
|
func (container *Container) logPath(name string) string {
|
|
return path.Join(container.root, fmt.Sprintf("%s-%s.log", container.ID, name))
|
|
}
|
|
|
|
func (container *Container) ReadLog(name string) (io.Reader, error) {
|
|
return os.Open(container.logPath(name))
|
|
}
|
|
|
|
func (container *Container) hostConfigPath() string {
|
|
return path.Join(container.root, "hostconfig.json")
|
|
}
|
|
|
|
func (container *Container) jsonPath() string {
|
|
return path.Join(container.root, "config.json")
|
|
}
|
|
|
|
func (container *Container) EnvConfigPath() (string, error) {
|
|
p := path.Join(container.root, "config.env")
|
|
if _, err := os.Stat(p); err != nil {
|
|
if os.IsNotExist(err) {
|
|
f, err := os.Create(p)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
f.Close()
|
|
} else {
|
|
return "", err
|
|
}
|
|
}
|
|
return p, nil
|
|
}
|
|
|
|
// This method must be exported to be used from the lxc template
|
|
// This directory is only usable when the container is running
|
|
func (container *Container) RootfsPath() string {
|
|
return container.basefs
|
|
}
|
|
|
|
func validateID(id string) error {
|
|
if id == "" {
|
|
return fmt.Errorf("Invalid empty id")
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// GetSize, return real size, virtual size
|
|
func (container *Container) GetSize() (int64, int64) {
|
|
var (
|
|
sizeRw, sizeRootfs int64
|
|
err error
|
|
driver = container.daemon.driver
|
|
)
|
|
|
|
if err := container.Mount(); err != nil {
|
|
utils.Errorf("Warning: failed to compute size of container rootfs %s: %s", container.ID, err)
|
|
return sizeRw, sizeRootfs
|
|
}
|
|
defer container.Unmount()
|
|
|
|
if differ, ok := container.daemon.driver.(graphdriver.Differ); ok {
|
|
sizeRw, err = differ.DiffSize(container.ID)
|
|
if err != nil {
|
|
utils.Errorf("Warning: driver %s couldn't return diff size of container %s: %s", driver, container.ID, err)
|
|
// FIXME: GetSize should return an error. Not changing it now in case
|
|
// there is a side-effect.
|
|
sizeRw = -1
|
|
}
|
|
} else {
|
|
changes, _ := container.Changes()
|
|
if changes != nil {
|
|
sizeRw = archive.ChangesSize(container.basefs, changes)
|
|
} else {
|
|
sizeRw = -1
|
|
}
|
|
}
|
|
|
|
if _, err = os.Stat(container.basefs); err != nil {
|
|
if sizeRootfs, err = utils.TreeSize(container.basefs); err != nil {
|
|
sizeRootfs = -1
|
|
}
|
|
}
|
|
return sizeRw, sizeRootfs
|
|
}
|
|
|
|
func (container *Container) Copy(resource string) (io.ReadCloser, error) {
|
|
if err := container.Mount(); err != nil {
|
|
return nil, err
|
|
}
|
|
var filter []string
|
|
basePath := path.Join(container.basefs, resource)
|
|
stat, err := os.Stat(basePath)
|
|
if err != nil {
|
|
container.Unmount()
|
|
return nil, err
|
|
}
|
|
if !stat.IsDir() {
|
|
d, f := path.Split(basePath)
|
|
basePath = d
|
|
filter = []string{f}
|
|
} else {
|
|
filter = []string{path.Base(basePath)}
|
|
basePath = path.Dir(basePath)
|
|
}
|
|
|
|
archive, err := archive.TarFilter(basePath, &archive.TarOptions{
|
|
Compression: archive.Uncompressed,
|
|
Includes: filter,
|
|
})
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return utils.NewReadCloserWrapper(archive, func() error {
|
|
err := archive.Close()
|
|
container.Unmount()
|
|
return err
|
|
}),
|
|
nil
|
|
}
|
|
|
|
// Returns true if the container exposes a certain port
|
|
func (container *Container) Exposes(p nat.Port) bool {
|
|
_, exists := container.Config.ExposedPorts[p]
|
|
return exists
|
|
}
|
|
|
|
func (container *Container) GetPtyMaster() (*os.File, error) {
|
|
ttyConsole, ok := container.command.Terminal.(execdriver.TtyTerminal)
|
|
if !ok {
|
|
return nil, ErrNoTTY
|
|
}
|
|
return ttyConsole.Master(), nil
|
|
}
|
|
|
|
func (container *Container) HostConfig() *runconfig.HostConfig {
|
|
return container.hostConfig
|
|
}
|
|
|
|
func (container *Container) SetHostConfig(hostConfig *runconfig.HostConfig) {
|
|
container.hostConfig = hostConfig
|
|
}
|
|
|
|
func (container *Container) DisableLink(name string) {
|
|
if container.activeLinks != nil {
|
|
if link, exists := container.activeLinks[name]; exists {
|
|
link.Disable()
|
|
} else {
|
|
utils.Debugf("Could not find active link for %s", name)
|
|
}
|
|
}
|
|
}
|
|
|
|
func (container *Container) setupContainerDns() error {
|
|
if container.ResolvConfPath != "" {
|
|
return nil
|
|
}
|
|
var (
|
|
config = container.hostConfig
|
|
daemon = container.daemon
|
|
)
|
|
resolvConf, err := utils.GetResolvConf()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
// If custom dns exists, then create a resolv.conf for the container
|
|
if len(config.Dns) > 0 || len(daemon.config.Dns) > 0 || len(config.DnsSearch) > 0 || len(daemon.config.DnsSearch) > 0 {
|
|
var (
|
|
dns = utils.GetNameservers(resolvConf)
|
|
dnsSearch = utils.GetSearchDomains(resolvConf)
|
|
)
|
|
if len(config.Dns) > 0 {
|
|
dns = config.Dns
|
|
} else if len(daemon.config.Dns) > 0 {
|
|
dns = daemon.config.Dns
|
|
}
|
|
if len(config.DnsSearch) > 0 {
|
|
dnsSearch = config.DnsSearch
|
|
} else if len(daemon.config.DnsSearch) > 0 {
|
|
dnsSearch = daemon.config.DnsSearch
|
|
}
|
|
container.ResolvConfPath = path.Join(container.root, "resolv.conf")
|
|
f, err := os.Create(container.ResolvConfPath)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer f.Close()
|
|
for _, dns := range dns {
|
|
if _, err := f.Write([]byte("nameserver " + dns + "\n")); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
if len(dnsSearch) > 0 {
|
|
if _, err := f.Write([]byte("search " + strings.Join(dnsSearch, " ") + "\n")); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
} else {
|
|
container.ResolvConfPath = "/etc/resolv.conf"
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (container *Container) initializeNetworking() error {
|
|
if container.daemon.config.DisableNetwork {
|
|
container.Config.NetworkDisabled = true
|
|
container.buildHostnameAndHostsFiles("127.0.1.1")
|
|
} else {
|
|
if err := container.allocateNetwork(); err != nil {
|
|
return err
|
|
}
|
|
container.buildHostnameAndHostsFiles(container.NetworkSettings.IPAddress)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Make sure the config is compatible with the current kernel
|
|
func (container *Container) verifyDaemonSettings() {
|
|
if container.Config.Memory > 0 && !container.daemon.sysInfo.MemoryLimit {
|
|
log.Printf("WARNING: Your kernel does not support memory limit capabilities. Limitation discarded.\n")
|
|
container.Config.Memory = 0
|
|
}
|
|
if container.Config.Memory > 0 && !container.daemon.sysInfo.SwapLimit {
|
|
log.Printf("WARNING: Your kernel does not support swap limit capabilities. Limitation discarded.\n")
|
|
container.Config.MemorySwap = -1
|
|
}
|
|
if container.daemon.sysInfo.IPv4ForwardingDisabled {
|
|
log.Printf("WARNING: IPv4 forwarding is disabled. Networking will not work")
|
|
}
|
|
}
|
|
|
|
func (container *Container) setupLinkedContainers() ([]string, error) {
|
|
var (
|
|
env []string
|
|
daemon = container.daemon
|
|
)
|
|
children, err := daemon.Children(container.Name)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if len(children) > 0 {
|
|
container.activeLinks = make(map[string]*links.Link, len(children))
|
|
|
|
// If we encounter an error make sure that we rollback any network
|
|
// config and ip table changes
|
|
rollback := func() {
|
|
for _, link := range container.activeLinks {
|
|
link.Disable()
|
|
}
|
|
container.activeLinks = nil
|
|
}
|
|
|
|
for linkAlias, child := range children {
|
|
if !child.State.IsRunning() {
|
|
return nil, fmt.Errorf("Cannot link to a non running container: %s AS %s", child.Name, linkAlias)
|
|
}
|
|
|
|
link, err := links.NewLink(
|
|
container.NetworkSettings.IPAddress,
|
|
child.NetworkSettings.IPAddress,
|
|
linkAlias,
|
|
child.Config.Env,
|
|
child.Config.ExposedPorts,
|
|
daemon.eng)
|
|
|
|
if err != nil {
|
|
rollback()
|
|
return nil, err
|
|
}
|
|
|
|
container.activeLinks[link.Alias()] = link
|
|
if err := link.Enable(); err != nil {
|
|
rollback()
|
|
return nil, err
|
|
}
|
|
|
|
for _, envVar := range link.ToEnv() {
|
|
env = append(env, envVar)
|
|
}
|
|
}
|
|
}
|
|
return env, nil
|
|
}
|
|
|
|
func (container *Container) createDaemonEnvironment(linkedEnv []string) []string {
|
|
// Setup environment
|
|
env := []string{
|
|
"HOME=/",
|
|
"PATH=" + DefaultPathEnv,
|
|
"HOSTNAME=" + container.Config.Hostname,
|
|
}
|
|
if container.Config.Tty {
|
|
env = append(env, "TERM=xterm")
|
|
}
|
|
env = append(env, linkedEnv...)
|
|
// because the env on the container can override certain default values
|
|
// we need to replace the 'env' keys where they match and append anything
|
|
// else.
|
|
env = utils.ReplaceOrAppendEnvValues(env, container.Config.Env)
|
|
|
|
return env
|
|
}
|
|
|
|
func (container *Container) setupWorkingDirectory() error {
|
|
if container.Config.WorkingDir != "" {
|
|
container.Config.WorkingDir = path.Clean(container.Config.WorkingDir)
|
|
|
|
pthInfo, err := os.Stat(path.Join(container.basefs, container.Config.WorkingDir))
|
|
if err != nil {
|
|
if !os.IsNotExist(err) {
|
|
return err
|
|
}
|
|
if err := os.MkdirAll(path.Join(container.basefs, container.Config.WorkingDir), 0755); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
if pthInfo != nil && !pthInfo.IsDir() {
|
|
return fmt.Errorf("Cannot mkdir: %s is not a directory", container.Config.WorkingDir)
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (container *Container) startLoggingToDisk() error {
|
|
// Setup logging of stdout and stderr to disk
|
|
if err := container.daemon.LogToDisk(container.stdout, container.logPath("json"), "stdout"); err != nil {
|
|
return err
|
|
}
|
|
if err := container.daemon.LogToDisk(container.stderr, container.logPath("json"), "stderr"); err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (container *Container) waitForStart() error {
|
|
callbackLock := make(chan struct{})
|
|
callback := func(command *execdriver.Command) {
|
|
container.State.SetRunning(command.Pid())
|
|
if command.Tty {
|
|
// The callback is called after the process Start()
|
|
// so we are in the parent process. In TTY mode, stdin/out/err is the PtySlace
|
|
// which we close here.
|
|
if c, ok := command.Stdout.(io.Closer); ok {
|
|
c.Close()
|
|
}
|
|
}
|
|
if err := container.ToDisk(); err != nil {
|
|
utils.Debugf("%s", err)
|
|
}
|
|
close(callbackLock)
|
|
}
|
|
|
|
// We use a callback here instead of a goroutine and an chan for
|
|
// syncronization purposes
|
|
cErr := utils.Go(func() error { return container.monitor(callback) })
|
|
|
|
// Start should not return until the process is actually running
|
|
select {
|
|
case <-callbackLock:
|
|
case err := <-cErr:
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (container *Container) allocatePort(eng *engine.Engine, port nat.Port, bindings nat.PortMap) error {
|
|
binding := bindings[port]
|
|
if container.hostConfig.PublishAllPorts && len(binding) == 0 {
|
|
binding = append(binding, nat.PortBinding{})
|
|
}
|
|
|
|
for i := 0; i < len(binding); i++ {
|
|
b := binding[i]
|
|
|
|
job := eng.Job("allocate_port", container.ID)
|
|
job.Setenv("HostIP", b.HostIp)
|
|
job.Setenv("HostPort", b.HostPort)
|
|
job.Setenv("Proto", port.Proto())
|
|
job.Setenv("ContainerPort", port.Port())
|
|
|
|
portEnv, err := job.Stdout.AddEnv()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if err := job.Run(); err != nil {
|
|
eng.Job("release_interface", container.ID).Run()
|
|
return err
|
|
}
|
|
b.HostIp = portEnv.Get("HostIP")
|
|
b.HostPort = portEnv.Get("HostPort")
|
|
|
|
binding[i] = b
|
|
}
|
|
bindings[port] = binding
|
|
return nil
|
|
}
|