357 lines
10 KiB
Go
357 lines
10 KiB
Go
// +build linux freebsd
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package daemon
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import (
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"context"
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"fmt"
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"io/ioutil"
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"os"
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"path/filepath"
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"strconv"
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"time"
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"github.com/docker/docker/container"
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"github.com/docker/docker/daemon/links"
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"github.com/docker/docker/pkg/idtools"
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"github.com/docker/docker/pkg/mount"
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"github.com/docker/docker/pkg/stringid"
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"github.com/docker/docker/runconfig"
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"github.com/docker/libnetwork"
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"github.com/opencontainers/selinux/go-selinux/label"
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"github.com/pkg/errors"
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"github.com/sirupsen/logrus"
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"golang.org/x/sys/unix"
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)
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func (daemon *Daemon) setupLinkedContainers(container *container.Container) ([]string, error) {
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var env []string
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children := daemon.children(container)
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bridgeSettings := container.NetworkSettings.Networks[runconfig.DefaultDaemonNetworkMode().NetworkName()]
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if bridgeSettings == nil || bridgeSettings.EndpointSettings == nil {
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return nil, nil
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}
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for linkAlias, child := range children {
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if !child.IsRunning() {
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return nil, fmt.Errorf("Cannot link to a non running container: %s AS %s", child.Name, linkAlias)
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}
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childBridgeSettings := child.NetworkSettings.Networks[runconfig.DefaultDaemonNetworkMode().NetworkName()]
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if childBridgeSettings == nil || childBridgeSettings.EndpointSettings == nil {
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return nil, fmt.Errorf("container %s not attached to default bridge network", child.ID)
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}
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link := links.NewLink(
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bridgeSettings.IPAddress,
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childBridgeSettings.IPAddress,
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linkAlias,
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child.Config.Env,
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child.Config.ExposedPorts,
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)
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env = append(env, link.ToEnv()...)
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}
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return env, nil
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}
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func (daemon *Daemon) getIpcContainer(container *container.Container) (*container.Container, error) {
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containerID := container.HostConfig.IpcMode.Container()
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container, err := daemon.GetContainer(containerID)
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if err != nil {
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return nil, errors.Wrapf(err, "cannot join IPC of a non running container: %s", container.ID)
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}
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return container, daemon.checkContainer(container, containerIsRunning, containerIsNotRestarting)
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}
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func (daemon *Daemon) getPidContainer(container *container.Container) (*container.Container, error) {
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containerID := container.HostConfig.PidMode.Container()
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container, err := daemon.GetContainer(containerID)
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if err != nil {
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return nil, errors.Wrapf(err, "cannot join PID of a non running container: %s", container.ID)
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}
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return container, daemon.checkContainer(container, containerIsRunning, containerIsNotRestarting)
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}
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func containerIsRunning(c *container.Container) error {
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if !c.IsRunning() {
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return errors.Errorf("container %s is not running", c.ID)
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}
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return nil
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}
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func containerIsNotRestarting(c *container.Container) error {
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if c.IsRestarting() {
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return errContainerIsRestarting(c.ID)
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}
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return nil
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}
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func (daemon *Daemon) setupIpcDirs(c *container.Container) error {
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var err error
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c.ShmPath, err = c.ShmResourcePath()
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if err != nil {
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return err
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}
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if c.HostConfig.IpcMode.IsContainer() {
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ic, err := daemon.getIpcContainer(c)
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if err != nil {
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return err
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}
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c.ShmPath = ic.ShmPath
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} else if c.HostConfig.IpcMode.IsHost() {
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if _, err := os.Stat("/dev/shm"); err != nil {
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return fmt.Errorf("/dev/shm is not mounted, but must be for --ipc=host")
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}
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c.ShmPath = "/dev/shm"
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} else {
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rootIDs := daemon.idMappings.RootPair()
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if !c.HasMountFor("/dev/shm") {
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shmPath, err := c.ShmResourcePath()
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if err != nil {
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return err
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}
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if err := idtools.MkdirAllAndChown(shmPath, 0700, rootIDs); err != nil {
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return err
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}
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shmSize := int64(daemon.configStore.ShmSize)
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if c.HostConfig.ShmSize != 0 {
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shmSize = c.HostConfig.ShmSize
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}
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shmproperty := "mode=1777,size=" + strconv.FormatInt(shmSize, 10)
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if err := unix.Mount("shm", shmPath, "tmpfs", uintptr(unix.MS_NOEXEC|unix.MS_NOSUID|unix.MS_NODEV), label.FormatMountLabel(shmproperty, c.GetMountLabel())); err != nil {
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return fmt.Errorf("mounting shm tmpfs: %s", err)
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}
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if err := os.Chown(shmPath, rootIDs.UID, rootIDs.GID); err != nil {
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return err
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}
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}
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}
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return nil
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}
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func (daemon *Daemon) setupSecretDir(c *container.Container) (setupErr error) {
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if len(c.SecretReferences) == 0 {
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return nil
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}
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localMountPath := c.SecretMountPath()
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logrus.Debugf("secrets: setting up secret dir: %s", localMountPath)
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// retrieve possible remapped range start for root UID, GID
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rootIDs := daemon.idMappings.RootPair()
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// create tmpfs
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if err := idtools.MkdirAllAndChown(localMountPath, 0700, rootIDs); err != nil {
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return errors.Wrap(err, "error creating secret local mount path")
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}
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defer func() {
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if setupErr != nil {
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// cleanup
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_ = detachMounted(localMountPath)
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if err := os.RemoveAll(localMountPath); err != nil {
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logrus.Errorf("error cleaning up secret mount: %s", err)
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}
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}
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}()
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tmpfsOwnership := fmt.Sprintf("uid=%d,gid=%d", rootIDs.UID, rootIDs.GID)
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if err := mount.Mount("tmpfs", localMountPath, "tmpfs", "nodev,nosuid,noexec,"+tmpfsOwnership); err != nil {
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return errors.Wrap(err, "unable to setup secret mount")
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}
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if c.DependencyStore == nil {
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return fmt.Errorf("secret store is not initialized")
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}
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for _, s := range c.SecretReferences {
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// TODO (ehazlett): use type switch when more are supported
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if s.File == nil {
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logrus.Error("secret target type is not a file target")
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continue
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}
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// secrets are created in the SecretMountPath on the host, at a
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// single level
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fPath := c.SecretFilePath(*s)
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if err := idtools.MkdirAllAndChown(filepath.Dir(fPath), 0700, rootIDs); err != nil {
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return errors.Wrap(err, "error creating secret mount path")
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}
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logrus.WithFields(logrus.Fields{
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"name": s.File.Name,
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"path": fPath,
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}).Debug("injecting secret")
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secret, err := c.DependencyStore.Secrets().Get(s.SecretID)
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if err != nil {
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return errors.Wrap(err, "unable to get secret from secret store")
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}
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if err := ioutil.WriteFile(fPath, secret.Spec.Data, s.File.Mode); err != nil {
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return errors.Wrap(err, "error injecting secret")
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}
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uid, err := strconv.Atoi(s.File.UID)
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if err != nil {
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return err
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}
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gid, err := strconv.Atoi(s.File.GID)
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if err != nil {
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return err
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}
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if err := os.Chown(fPath, rootIDs.UID+uid, rootIDs.GID+gid); err != nil {
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return errors.Wrap(err, "error setting ownership for secret")
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}
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}
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label.Relabel(localMountPath, c.MountLabel, false)
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// remount secrets ro
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if err := mount.Mount("tmpfs", localMountPath, "tmpfs", "remount,ro,"+tmpfsOwnership); err != nil {
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return errors.Wrap(err, "unable to remount secret dir as readonly")
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}
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return nil
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}
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func (daemon *Daemon) setupConfigDir(c *container.Container) (setupErr error) {
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if len(c.ConfigReferences) == 0 {
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return nil
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}
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localPath := c.ConfigsDirPath()
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logrus.Debugf("configs: setting up config dir: %s", localPath)
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// retrieve possible remapped range start for root UID, GID
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rootIDs := daemon.idMappings.RootPair()
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// create tmpfs
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if err := idtools.MkdirAllAndChown(localPath, 0700, rootIDs); err != nil {
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return errors.Wrap(err, "error creating config dir")
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}
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defer func() {
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if setupErr != nil {
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if err := os.RemoveAll(localPath); err != nil {
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logrus.Errorf("error cleaning up config dir: %s", err)
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}
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}
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}()
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if c.DependencyStore == nil {
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return fmt.Errorf("config store is not initialized")
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}
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for _, configRef := range c.ConfigReferences {
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// TODO (ehazlett): use type switch when more are supported
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if configRef.File == nil {
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logrus.Error("config target type is not a file target")
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continue
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}
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fPath := c.ConfigFilePath(*configRef)
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log := logrus.WithFields(logrus.Fields{"name": configRef.File.Name, "path": fPath})
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if err := idtools.MkdirAllAndChown(filepath.Dir(fPath), 0700, rootIDs); err != nil {
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return errors.Wrap(err, "error creating config path")
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}
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log.Debug("injecting config")
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config, err := c.DependencyStore.Configs().Get(configRef.ConfigID)
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if err != nil {
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return errors.Wrap(err, "unable to get config from config store")
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}
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if err := ioutil.WriteFile(fPath, config.Spec.Data, configRef.File.Mode); err != nil {
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return errors.Wrap(err, "error injecting config")
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}
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uid, err := strconv.Atoi(configRef.File.UID)
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if err != nil {
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return err
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}
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gid, err := strconv.Atoi(configRef.File.GID)
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if err != nil {
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return err
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}
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if err := os.Chown(fPath, rootIDs.UID+uid, rootIDs.GID+gid); err != nil {
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return errors.Wrap(err, "error setting ownership for config")
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}
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}
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return nil
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}
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func killProcessDirectly(cntr *container.Container) error {
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ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
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defer cancel()
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// Block until the container to stops or timeout.
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status := <-cntr.Wait(ctx, container.WaitConditionNotRunning)
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if status.Err() != nil {
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// Ensure that we don't kill ourselves
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if pid := cntr.GetPID(); pid != 0 {
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logrus.Infof("Container %s failed to exit within 10 seconds of kill - trying direct SIGKILL", stringid.TruncateID(cntr.ID))
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if err := unix.Kill(pid, 9); err != nil {
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if err != unix.ESRCH {
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return err
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}
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e := errNoSuchProcess{pid, 9}
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logrus.Debug(e)
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return e
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}
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}
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}
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return nil
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}
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func detachMounted(path string) error {
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return unix.Unmount(path, unix.MNT_DETACH)
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}
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func isLinkable(child *container.Container) bool {
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// A container is linkable only if it belongs to the default network
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_, ok := child.NetworkSettings.Networks[runconfig.DefaultDaemonNetworkMode().NetworkName()]
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return ok
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}
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func enableIPOnPredefinedNetwork() bool {
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return false
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}
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func (daemon *Daemon) isNetworkHotPluggable() bool {
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return true
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}
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func setupPathsAndSandboxOptions(container *container.Container, sboxOptions *[]libnetwork.SandboxOption) error {
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var err error
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container.HostsPath, err = container.GetRootResourcePath("hosts")
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if err != nil {
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return err
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}
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*sboxOptions = append(*sboxOptions, libnetwork.OptionHostsPath(container.HostsPath))
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container.ResolvConfPath, err = container.GetRootResourcePath("resolv.conf")
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if err != nil {
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return err
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}
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*sboxOptions = append(*sboxOptions, libnetwork.OptionResolvConfPath(container.ResolvConfPath))
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return nil
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}
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func (daemon *Daemon) initializeNetworkingPaths(container *container.Container, nc *container.Container) error {
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container.HostnamePath = nc.HostnamePath
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container.HostsPath = nc.HostsPath
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container.ResolvConfPath = nc.ResolvConfPath
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return nil
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}
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