package libpod import ( "bytes" "context" "encoding/json" "fmt" "io" "io/ioutil" "os" "path/filepath" "strings" "syscall" "time" "github.com/containers/storage" "github.com/containers/storage/pkg/archive" "github.com/containers/storage/pkg/chrootarchive" "github.com/docker/docker/pkg/mount" "github.com/docker/docker/pkg/stringid" spec "github.com/opencontainers/runtime-spec/specs-go" "github.com/opencontainers/runtime-tools/generate" "github.com/opencontainers/selinux/go-selinux/label" "github.com/pkg/errors" "github.com/projectatomic/libpod/pkg/chrootuser" "github.com/projectatomic/libpod/pkg/hooks" "github.com/projectatomic/libpod/pkg/hooks/exec" "github.com/projectatomic/libpod/pkg/rootless" "github.com/projectatomic/libpod/pkg/secrets" "github.com/projectatomic/libpod/pkg/util" "github.com/sirupsen/logrus" "github.com/ulule/deepcopier" "golang.org/x/text/language" ) const ( // name of the directory holding the artifacts artifactsDir = "artifacts" ) var ( // localeToLanguage maps from locale values to language tags. localeToLanguage = map[string]string{ "": "und-u-va-posix", "c": "und-u-va-posix", "posix": "und-u-va-posix", } ) // rootFsSize gets the size of the container's root filesystem // A container FS is split into two parts. The first is the top layer, a // mutable layer, and the rest is the RootFS: the set of immutable layers // that make up the image on which the container is based. func (c *Container) rootFsSize() (int64, error) { if c.config.Rootfs != "" { return 0, nil } container, err := c.runtime.store.Container(c.ID()) if err != nil { return 0, err } // Ignore the size of the top layer. The top layer is a mutable RW layer // and is not considered a part of the rootfs rwLayer, err := c.runtime.store.Layer(container.LayerID) if err != nil { return 0, err } layer, err := c.runtime.store.Layer(rwLayer.Parent) if err != nil { return 0, err } size := int64(0) for layer.Parent != "" { layerSize, err := c.runtime.store.DiffSize(layer.Parent, layer.ID) if err != nil { return size, errors.Wrapf(err, "getting diffsize of layer %q and its parent %q", layer.ID, layer.Parent) } size += layerSize layer, err = c.runtime.store.Layer(layer.Parent) if err != nil { return 0, err } } // Get the size of the last layer. Has to be outside of the loop // because the parent of the last layer is "", and lstore.Get("") // will return an error. layerSize, err := c.runtime.store.DiffSize(layer.Parent, layer.ID) return size + layerSize, err } // rwSize Gets the size of the mutable top layer of the container. func (c *Container) rwSize() (int64, error) { if c.config.Rootfs != "" { var size int64 err := filepath.Walk(c.config.Rootfs, func(path string, info os.FileInfo, err error) error { if err != nil { return err } size += info.Size() return nil }) return size, err } container, err := c.runtime.store.Container(c.ID()) if err != nil { return 0, err } // Get the size of the top layer by calculating the size of the diff // between the layer and its parent. The top layer of a container is // the only RW layer, all others are immutable layer, err := c.runtime.store.Layer(container.LayerID) if err != nil { return 0, err } return c.runtime.store.DiffSize(layer.Parent, layer.ID) } // bundlePath returns the path to the container's root filesystem - where the OCI spec will be // placed, amongst other things func (c *Container) bundlePath() string { return c.config.StaticDir } // ControlSocketPath returns the path to the containers control socket for things like tty // resizing func (c *Container) ControlSocketPath() string { return filepath.Join(c.bundlePath(), "ctl") } // AttachSocketPath retrieves the path of the container's attach socket func (c *Container) AttachSocketPath() string { return filepath.Join(c.runtime.ociRuntime.socketsDir, c.ID(), "attach") } // Get PID file path for a container's exec session func (c *Container) execPidPath(sessionID string) string { return filepath.Join(c.state.RunDir, "exec_pid_"+sessionID) } // Sync this container with on-disk state and runtime status // Should only be called with container lock held // This function should suffice to ensure a container's state is accurate and // it is valid for use. func (c *Container) syncContainer() error { if err := c.runtime.state.UpdateContainer(c); err != nil { return err } // If runtime knows about the container, update its status in runtime // And then save back to disk if (c.state.State != ContainerStateUnknown) && (c.state.State != ContainerStateConfigured) { oldState := c.state.State // TODO: optionally replace this with a stat for the exit file if err := c.runtime.ociRuntime.updateContainerStatus(c); err != nil { return err } // Only save back to DB if state changed if c.state.State != oldState { if err := c.save(); err != nil { return err } } } if !c.valid { return errors.Wrapf(ErrCtrRemoved, "container %s is not valid", c.ID()) } return nil } // Make a new container func newContainer(rspec *spec.Spec, lockDir string) (*Container, error) { if rspec == nil { return nil, errors.Wrapf(ErrInvalidArg, "must provide a valid runtime spec to create container") } ctr := new(Container) ctr.config = new(ContainerConfig) ctr.state = new(containerState) ctr.config.ID = stringid.GenerateNonCryptoID() ctr.config.Spec = new(spec.Spec) deepcopier.Copy(rspec).To(ctr.config.Spec) ctr.config.CreatedTime = time.Now() ctr.config.ShmSize = DefaultShmSize ctr.state.BindMounts = make(map[string]string) // Path our lock file will reside at lockPath := filepath.Join(lockDir, ctr.config.ID) // Grab a lockfile at the given path lock, err := storage.GetLockfile(lockPath) if err != nil { return nil, errors.Wrapf(err, "error creating lockfile for new container") } ctr.lock = lock return ctr, nil } // Create container root filesystem for use func (c *Container) setupStorage(ctx context.Context) error { if !c.valid { return errors.Wrapf(ErrCtrRemoved, "container %s is not valid", c.ID()) } if c.state.State != ContainerStateConfigured { return errors.Wrapf(ErrCtrStateInvalid, "container %s must be in Configured state to have storage set up", c.ID()) } // Need both an image ID and image name, plus a bool telling us whether to use the image configuration if c.config.Rootfs == "" && (c.config.RootfsImageID == "" || c.config.RootfsImageName == "") { return errors.Wrapf(ErrInvalidArg, "must provide image ID and image name to use an image") } var options *storage.ContainerOptions if c.config.Rootfs == "" { options = &storage.ContainerOptions{c.config.IDMappings} } containerInfo, err := c.runtime.storageService.CreateContainerStorage(ctx, c.runtime.imageContext, c.config.RootfsImageName, c.config.RootfsImageID, c.config.Name, c.config.ID, c.config.MountLabel, options) if err != nil { return errors.Wrapf(err, "error creating container storage") } if !rootless.IsRootless() && (len(c.config.IDMappings.UIDMap) != 0 || len(c.config.IDMappings.GIDMap) != 0) { info, err := os.Stat(c.runtime.config.TmpDir) if err != nil { return errors.Wrapf(err, "cannot stat `%s`", c.runtime.config.TmpDir) } if err := os.Chmod(c.runtime.config.TmpDir, info.Mode()|0111); err != nil { return errors.Wrapf(err, "cannot chmod `%s`", c.runtime.config.TmpDir) } root := filepath.Join(c.runtime.config.TmpDir, "containers-root", c.ID()) if err := os.MkdirAll(root, 0755); err != nil { return errors.Wrapf(err, "error creating userNS tmpdir for container %s", c.ID()) } if err := os.Chown(root, c.RootUID(), c.RootGID()); err != nil { return err } c.state.UserNSRoot, err = filepath.EvalSymlinks(root) if err != nil { return errors.Wrapf(err, "failed to eval symlinks for %s", root) } } c.config.StaticDir = containerInfo.Dir c.state.RunDir = containerInfo.RunDir c.state.DestinationRunDir = c.state.RunDir if c.state.UserNSRoot != "" { c.state.DestinationRunDir = filepath.Join(c.state.UserNSRoot, "rundir") } // Set the default Entrypoint and Command if c.config.Entrypoint == nil { c.config.Entrypoint = containerInfo.Config.Config.Entrypoint } if c.config.Command == nil { c.config.Command = containerInfo.Config.Config.Cmd } artifacts := filepath.Join(c.config.StaticDir, artifactsDir) if err := os.MkdirAll(artifacts, 0755); err != nil { return errors.Wrapf(err, "error creating artifacts directory %q", artifacts) } return nil } // Tear down a container's storage prior to removal func (c *Container) teardownStorage() error { if c.state.State == ContainerStateRunning || c.state.State == ContainerStatePaused { return errors.Wrapf(ErrCtrStateInvalid, "cannot remove storage for container %s as it is running or paused", c.ID()) } artifacts := filepath.Join(c.config.StaticDir, artifactsDir) if err := os.RemoveAll(artifacts); err != nil { return errors.Wrapf(err, "error removing artifacts %q", artifacts) } if err := c.cleanupStorage(); err != nil { return errors.Wrapf(err, "failed to cleanup container %s storage", c.ID()) } if c.state.UserNSRoot != "" { if err := os.RemoveAll(c.state.UserNSRoot); err != nil { return errors.Wrapf(err, "error removing userns root %q", c.state.UserNSRoot) } } if err := c.runtime.storageService.DeleteContainer(c.ID()); err != nil { // If the container has already been removed, warn but do not // error - we wanted it gone, it is already gone. // Potentially another tool using containers/storage already // removed it? if err == storage.ErrNotAContainer || err == storage.ErrContainerUnknown { logrus.Warnf("Storage for container %s already removed", c.ID()) return nil } return errors.Wrapf(err, "error removing container %s root filesystem", c.ID()) } return nil } // Reset resets state fields to default values // It is performed before a refresh and clears the state after a reboot // It does not save the results - assumes the database will do that for us func resetState(state *containerState) error { state.PID = 0 state.Mountpoint = "" state.Mounted = false state.State = ContainerStateConfigured state.ExecSessions = make(map[string]*ExecSession) state.NetworkStatus = nil state.BindMounts = make(map[string]string) return nil } // Refresh refreshes the container's state after a restart func (c *Container) refresh() error { if !c.valid { return errors.Wrapf(ErrCtrRemoved, "container %s is not valid - may have been removed", c.ID()) } // We need to get the container's temporary directory from c/storage // It was lost in the reboot and must be recreated dir, err := c.runtime.storageService.GetRunDir(c.ID()) if err != nil { return errors.Wrapf(err, "error retrieving temporary directory for container %s", c.ID()) } if len(c.config.IDMappings.UIDMap) != 0 || len(c.config.IDMappings.GIDMap) != 0 { info, err := os.Stat(c.runtime.config.TmpDir) if err != nil { return errors.Wrapf(err, "cannot stat `%s`", c.runtime.config.TmpDir) } if err := os.Chmod(c.runtime.config.TmpDir, info.Mode()|0111); err != nil { return errors.Wrapf(err, "cannot chmod `%s`", c.runtime.config.TmpDir) } root := filepath.Join(c.runtime.config.TmpDir, "containers-root", c.ID()) if err := os.MkdirAll(root, 0755); err != nil { return errors.Wrapf(err, "error creating userNS tmpdir for container %s", c.ID()) } if err := os.Chown(root, c.RootUID(), c.RootGID()); err != nil { return err } c.state.UserNSRoot, err = filepath.EvalSymlinks(root) if err != nil { return errors.Wrapf(err, "failed to eval symlinks for %s", root) } } c.state.RunDir = dir c.state.DestinationRunDir = c.state.RunDir if c.state.UserNSRoot != "" { c.state.DestinationRunDir = filepath.Join(c.state.UserNSRoot, "rundir") } if err := c.save(); err != nil { return errors.Wrapf(err, "error refreshing state for container %s", c.ID()) } // Remove ctl and attach files, which may persist across reboot if err := c.removeConmonFiles(); err != nil { return err } return nil } // Remove conmon attach socket and terminal resize FIFO // This is necessary for restarting containers func (c *Container) removeConmonFiles() error { // Files are allowed to not exist, so ignore ENOENT attachFile := filepath.Join(c.bundlePath(), "attach") if err := os.Remove(attachFile); err != nil && !os.IsNotExist(err) { return errors.Wrapf(err, "error removing container %s attach file", c.ID()) } ctlFile := filepath.Join(c.bundlePath(), "ctl") if err := os.Remove(ctlFile); err != nil && !os.IsNotExist(err) { return errors.Wrapf(err, "error removing container %s ctl file", c.ID()) } oomFile := filepath.Join(c.bundlePath(), "oom") if err := os.Remove(oomFile); err != nil && !os.IsNotExist(err) { return errors.Wrapf(err, "error removing container %s OOM file", c.ID()) } exitFile := filepath.Join(c.runtime.ociRuntime.exitsDir, c.ID()) if err := os.Remove(exitFile); err != nil && !os.IsNotExist(err) { return errors.Wrapf(err, "error removing container %s exit file", c.ID()) } return nil } func (c *Container) export(path string) error { mountPoint := c.state.Mountpoint if !c.state.Mounted { mount, err := c.runtime.store.Mount(c.ID(), c.config.MountLabel) if err != nil { return errors.Wrapf(err, "error mounting container %q", c.ID()) } mountPoint = mount defer func() { if _, err := c.runtime.store.Unmount(c.ID(), false); err != nil { logrus.Errorf("error unmounting container %q: %v", c.ID(), err) } }() } input, err := archive.Tar(mountPoint, archive.Uncompressed) if err != nil { return errors.Wrapf(err, "error reading container directory %q", c.ID()) } outFile, err := os.Create(path) if err != nil { return errors.Wrapf(err, "error creating file %q", path) } defer outFile.Close() _, err = io.Copy(outFile, input) return err } // Get path of artifact with a given name for this container func (c *Container) getArtifactPath(name string) string { return filepath.Join(c.config.StaticDir, artifactsDir, name) } // Used with Wait() to determine if a container has exited func (c *Container) isStopped() (bool, error) { if !c.batched { c.lock.Lock() defer c.lock.Unlock() } err := c.syncContainer() if err != nil { return true, err } return c.state.State == ContainerStateStopped, nil } // save container state to the database func (c *Container) save() error { if err := c.runtime.state.SaveContainer(c); err != nil { return errors.Wrapf(err, "error saving container %s state", c.ID()) } return nil } // Check if a container's dependencies are running // Returns a []string containing the IDs of dependencies that are not running func (c *Container) checkDependenciesRunning() ([]string, error) { deps := c.Dependencies() notRunning := []string{} // We were not passed a set of dependency containers // Make it ourselves depCtrs := make(map[string]*Container, len(deps)) for _, dep := range deps { // Get the dependency container depCtr, err := c.runtime.state.Container(dep) if err != nil { return nil, errors.Wrapf(err, "error retrieving dependency %s of container %s from state", dep, c.ID()) } // Check the status state, err := depCtr.State() if err != nil { return nil, errors.Wrapf(err, "error retrieving state of dependency %s of container %s", dep, c.ID()) } if state != ContainerStateRunning { notRunning = append(notRunning, dep) } depCtrs[dep] = depCtr } return notRunning, nil } // Check if a container's dependencies are running // Returns a []string containing the IDs of dependencies that are not running // Assumes depencies are already locked, and will be passed in // Accepts a map[string]*Container containing, at a minimum, the locked // dependency containers // (This must be a map from container ID to container) func (c *Container) checkDependenciesRunningLocked(depCtrs map[string]*Container) ([]string, error) { deps := c.Dependencies() notRunning := []string{} for _, dep := range deps { depCtr, ok := depCtrs[dep] if !ok { return nil, errors.Wrapf(ErrNoSuchCtr, "container %s depends on container %s but it is not on containers passed to checkDependenciesRunning", c.ID(), dep) } if err := c.syncContainer(); err != nil { return nil, err } if depCtr.state.State != ContainerStateRunning { notRunning = append(notRunning, dep) } } return notRunning, nil } func (c *Container) completeNetworkSetup() error { if !c.config.PostConfigureNetNS { return nil } if rootless.IsRootless() { return nil } if err := c.syncContainer(); err != nil { return err } return c.runtime.setupNetNS(c) } // Initialize a container, creating it in the runtime func (c *Container) init(ctx context.Context) error { if err := c.makeBindMounts(); err != nil { return err } // Generate the OCI spec spec, err := c.generateSpec(ctx) if err != nil { return err } // Save the OCI spec to disk if err := c.saveSpec(spec); err != nil { return err } // With the spec complete, do an OCI create if err := c.runtime.ociRuntime.createContainer(c, c.config.CgroupParent); err != nil { return err } logrus.Debugf("Created container %s in OCI runtime", c.ID()) c.state.State = ContainerStateCreated if err := c.save(); err != nil { return err } return c.completeNetworkSetup() } // Reinitialize a container // Deletes and recreates a container in the runtime // Should only be done on ContainerStateStopped containers func (c *Container) reinit(ctx context.Context) error { logrus.Debugf("Recreating container %s in OCI runtime", c.ID()) // If necessary, delete attach and ctl files if err := c.removeConmonFiles(); err != nil { return err } if err := c.delete(ctx); err != nil { return err } // Our state is now Configured, as we've removed ourself from // the runtime // Set and save now to make sure that, if the init() below fails // we still have a valid state c.state.State = ContainerStateConfigured c.state.ExitCode = 0 c.state.Exited = false if err := c.save(); err != nil { return err } logrus.Debugf("Successfully cleaned up container %s", c.ID()) // Initialize the container again return c.init(ctx) } // Initialize (if necessary) and start a container // Performs all necessary steps to start a container that is not running // Does not lock or check validity func (c *Container) initAndStart(ctx context.Context) (err error) { // If we are ContainerStateUnknown, throw an error if c.state.State == ContainerStateUnknown { return errors.Wrapf(ErrCtrStateInvalid, "container %s is in an unknown state", c.ID()) } // If we are running, do nothing if c.state.State == ContainerStateRunning { return nil } // If we are paused, throw an error if c.state.State == ContainerStatePaused { return errors.Wrapf(ErrCtrStateInvalid, "cannot start paused container %s", c.ID()) } if err := c.prepare(); err != nil { return err } defer func() { if err != nil { if err2 := c.cleanup(); err2 != nil { logrus.Errorf("error cleaning up container %s: %v", c.ID(), err2) } } }() // If we are ContainerStateStopped we need to remove from runtime // And reset to ContainerStateConfigured if c.state.State == ContainerStateStopped { logrus.Debugf("Recreating container %s in OCI runtime", c.ID()) // If necessary, delete attach and ctl files if err := c.removeConmonFiles(); err != nil { return err } // Delete the container in the runtime if err := c.runtime.ociRuntime.deleteContainer(c); err != nil { return errors.Wrapf(err, "error removing container %s from runtime", c.ID()) } // Our state is now Configured, as we've removed ourself from // the runtime // Set and save now to make sure that, if the init() below fails // we still have a valid state c.state.State = ContainerStateConfigured if err := c.save(); err != nil { return err } } // If we are ContainerStateConfigured we need to init() if c.state.State == ContainerStateConfigured { if err := c.init(ctx); err != nil { return err } } // Now start the container return c.start() } // Internal, non-locking function to start a container func (c *Container) start() error { if err := c.runtime.ociRuntime.startContainer(c); err != nil { return err } logrus.Debugf("Started container %s", c.ID()) c.state.State = ContainerStateRunning return c.save() } // Internal, non-locking function to stop container func (c *Container) stop(timeout uint) error { logrus.Debugf("Stopping ctr %s with timeout %d", c.ID(), timeout) if err := c.runtime.ociRuntime.stopContainer(c, timeout); err != nil { return err } // Sync the container's state to pick up return code if err := c.runtime.ociRuntime.updateContainerStatus(c); err != nil { return err } // Container should clean itself up return nil } // Internal, non-locking function to pause a container func (c *Container) pause() error { if err := c.runtime.ociRuntime.pauseContainer(c); err != nil { return err } logrus.Debugf("Paused container %s", c.ID()) c.state.State = ContainerStatePaused return c.save() } // Internal, non-locking function to unpause a container func (c *Container) unpause() error { if err := c.runtime.ociRuntime.unpauseContainer(c); err != nil { return err } logrus.Debugf("Unpaused container %s", c.ID()) c.state.State = ContainerStateRunning return c.save() } // Internal, non-locking function to restart a container func (c *Container) restartWithTimeout(ctx context.Context, timeout uint) (err error) { if c.state.State == ContainerStateUnknown || c.state.State == ContainerStatePaused { return errors.Wrapf(ErrCtrStateInvalid, "unable to restart a container in a paused or unknown state") } if c.state.State == ContainerStateRunning { if err := c.stop(timeout); err != nil { return err } } if err := c.prepare(); err != nil { return err } defer func() { if err != nil { if err2 := c.cleanup(); err2 != nil { logrus.Errorf("error cleaning up container %s: %v", c.ID(), err2) } } }() if c.state.State == ContainerStateStopped { // Reinitialize the container if we need to if err := c.reinit(ctx); err != nil { return err } } else if c.state.State == ContainerStateConfigured { // Initialize the container if it has never been initialized if err := c.init(ctx); err != nil { return err } } return c.start() } // mountStorage sets up the container's root filesystem // It mounts the image and any other requested mounts // TODO: Add ability to override mount label so we can use this for Mount() too // TODO: Can we use this for export? Copying SHM into the export might not be // good func (c *Container) mountStorage() (err error) { // Container already mounted, nothing to do if c.state.Mounted { return nil } if !rootless.IsRootless() { // TODO: generalize this mount code so it will mount every mount in ctr.config.Mounts mounted, err := mount.Mounted(c.config.ShmDir) if err != nil { return errors.Wrapf(err, "unable to determine if %q is mounted", c.config.ShmDir) } if err := os.Chown(c.config.ShmDir, c.RootUID(), c.RootGID()); err != nil { return errors.Wrapf(err, "failed to chown %s", c.config.ShmDir) } if !mounted { shmOptions := fmt.Sprintf("mode=1777,size=%d", c.config.ShmSize) if err := c.mountSHM(shmOptions); err != nil { return err } if err := os.Chown(c.config.ShmDir, c.RootUID(), c.RootGID()); err != nil { return errors.Wrapf(err, "failed to chown %s", c.config.ShmDir) } } } mountPoint := c.config.Rootfs if mountPoint == "" { mountPoint, err = c.mount() if err != nil { return err } } c.state.Mounted = true c.state.Mountpoint = mountPoint if c.state.UserNSRoot == "" { c.state.RealMountpoint = c.state.Mountpoint } else { c.state.RealMountpoint = filepath.Join(c.state.UserNSRoot, "mountpoint") } logrus.Debugf("Created root filesystem for container %s at %s", c.ID(), c.state.Mountpoint) defer func() { if err != nil { if err2 := c.cleanupStorage(); err2 != nil { logrus.Errorf("Error unmounting storage for container %s: %v", c.ID(), err) } } }() return c.save() } // cleanupStorage unmounts and cleans up the container's root filesystem func (c *Container) cleanupStorage() error { if !c.state.Mounted { // Already unmounted, do nothing logrus.Debugf("Storage is already unmounted, skipping...") return nil } for _, mount := range c.config.Mounts { if err := c.unmountSHM(mount); err != nil { return err } } if c.config.Rootfs != "" { return nil } if err := c.unmount(); err != nil { // If the container has already been removed, warn but don't // error // We still want to be able to kick the container out of the // state if err == storage.ErrNotAContainer || err == storage.ErrContainerUnknown { logrus.Errorf("Storage for container %s has been removed", c.ID()) return nil } return err } c.state.Mountpoint = "" c.state.Mounted = false if c.valid { return c.save() } return nil } // Unmount the a container and free its resources func (c *Container) cleanup() error { var lastError error logrus.Debugf("Cleaning up container %s", c.ID()) // Clean up network namespace, if present if err := c.cleanupNetwork(); err != nil { lastError = err } // Unmount storage if err := c.cleanupStorage(); err != nil { if lastError != nil { logrus.Errorf("Error unmounting container %s storage: %v", c.ID(), err) } else { lastError = err } } return lastError } // delete deletes the container and runs any configured poststop // hooks. func (c *Container) delete(ctx context.Context) (err error) { if err := c.runtime.ociRuntime.deleteContainer(c); err != nil { return errors.Wrapf(err, "error removing container %s from runtime", c.ID()) } if err := c.postDeleteHooks(ctx); err != nil { return errors.Wrapf(err, "container %s poststop hooks", c.ID()) } return nil } // postDeleteHooks runs the poststop hooks (if any) as specified by // the OCI Runtime Specification (which requires them to run // post-delete, despite the stage name). func (c *Container) postDeleteHooks(ctx context.Context) (err error) { if c.state.ExtensionStageHooks != nil { extensionHooks, ok := c.state.ExtensionStageHooks["poststop"] if ok { state, err := json.Marshal(spec.State{ Version: spec.Version, ID: c.ID(), Status: "stopped", Bundle: c.bundlePath(), Annotations: c.config.Spec.Annotations, }) if err != nil { return err } for i, hook := range extensionHooks { logrus.Debugf("container %s: invoke poststop hook %d, path %s", c.ID(), i, hook.Path) var stderr, stdout bytes.Buffer hookErr, err := exec.Run(ctx, &hook, state, &stdout, &stderr, exec.DefaultPostKillTimeout) if err != nil { logrus.Warnf("container %s: poststop hook %d: %v", c.ID(), i, err) if hookErr != err { logrus.Debugf("container %s: poststop hook %d (hook error): %v", c.ID(), i, hookErr) } stdoutString := stdout.String() if stdoutString != "" { logrus.Debugf("container %s: poststop hook %d: stdout:\n%s", c.ID(), i, stdoutString) } stderrString := stderr.String() if stderrString != "" { logrus.Debugf("container %s: poststop hook %d: stderr:\n%s", c.ID(), i, stderrString) } } } } } return nil } // Make standard bind mounts to include in the container func (c *Container) makeBindMounts() error { if err := os.Chown(c.state.RunDir, c.RootUID(), c.RootGID()); err != nil { return errors.Wrapf(err, "cannot chown run directory %s", c.state.RunDir) } if c.state.BindMounts == nil { c.state.BindMounts = make(map[string]string) } // SHM is always added when we mount the container c.state.BindMounts["/dev/shm"] = c.config.ShmDir // Make /etc/resolv.conf if _, ok := c.state.BindMounts["/etc/resolv.conf"]; ok { // If it already exists, delete so we can recreate delete(c.state.BindMounts, "/etc/resolv.conf") } newResolv, err := c.generateResolvConf() if err != nil { return errors.Wrapf(err, "error creating resolv.conf for container %s", c.ID()) } c.state.BindMounts["/etc/resolv.conf"] = newResolv // Make /etc/hosts if _, ok := c.state.BindMounts["/etc/hosts"]; ok { // If it already exists, delete so we can recreate delete(c.state.BindMounts, "/etc/hosts") } newHosts, err := c.generateHosts() if err != nil { return errors.Wrapf(err, "error creating hosts file for container %s", c.ID()) } c.state.BindMounts["/etc/hosts"] = newHosts // Make /etc/hostname // This should never change, so no need to recreate if it exists if _, ok := c.state.BindMounts["/etc/hostname"]; !ok { hostnamePath, err := c.writeStringToRundir("hostname", c.Hostname()) if err != nil { return errors.Wrapf(err, "error creating hostname file for container %s", c.ID()) } c.state.BindMounts["/etc/hostname"] = hostnamePath } // Make .containerenv // Empty file, so no need to recreate if it exists if _, ok := c.state.BindMounts["/run/.containerenv"]; !ok { // Empty string for now, but we may consider populating this later containerenvPath, err := c.writeStringToRundir(".containerenv", "") if err != nil { return errors.Wrapf(err, "error creating containerenv file for container %s", c.ID()) } c.state.BindMounts["/run/.containerenv"] = containerenvPath } // Add Secret Mounts secretMounts := secrets.SecretMountsWithUIDGID(c.config.MountLabel, c.state.RunDir, c.runtime.config.DefaultMountsFile, c.state.DestinationRunDir, c.RootUID(), c.RootGID()) for _, mount := range secretMounts { if _, ok := c.state.BindMounts[mount.Destination]; !ok { c.state.BindMounts[mount.Destination] = mount.Source } } return nil } // writeStringToRundir copies the provided file to the runtimedir func (c *Container) writeStringToRundir(destFile, output string) (string, error) { destFileName := filepath.Join(c.state.RunDir, destFile) if err := os.Remove(destFileName); err != nil && !os.IsNotExist(err) { return "", errors.Wrapf(err, "error removing %s for container %s", destFile, c.ID()) } f, err := os.Create(destFileName) if err != nil { return "", errors.Wrapf(err, "unable to create %s", destFileName) } defer f.Close() if err := f.Chown(c.RootUID(), c.RootGID()); err != nil { return "", err } if _, err := f.WriteString(output); err != nil { return "", errors.Wrapf(err, "unable to write %s", destFileName) } // Relabel runDirResolv for the container if err := label.Relabel(destFileName, c.config.MountLabel, false); err != nil { return "", err } return filepath.Join(c.state.DestinationRunDir, destFile), nil } type resolvConf struct { nameServers []string searchDomains []string options []string } // generateResolvConf generates a containers resolv.conf func (c *Container) generateResolvConf() (string, error) { // Copy /etc/resolv.conf to the container's rundir resolvPath := "/etc/resolv.conf" // Check if the host system is using system resolve and if so // copy its resolv.conf if _, err := os.Stat("/run/systemd/resolve/resolv.conf"); err == nil { resolvPath = "/run/systemd/resolve/resolv.conf" } orig, err := ioutil.ReadFile(resolvPath) if err != nil { return "", errors.Wrapf(err, "unable to read %s", resolvPath) } if len(c.config.DNSServer) == 0 && len(c.config.DNSSearch) == 0 && len(c.config.DNSOption) == 0 { return c.writeStringToRundir("resolv.conf", fmt.Sprintf("%s", orig)) } // Read and organize the hosts /etc/resolv.conf resolv := createResolv(string(orig[:])) // Populate the resolv struct with user's dns search domains if len(c.config.DNSSearch) > 0 { resolv.searchDomains = nil // The . character means the user doesnt want any search domains in the container if !util.StringInSlice(".", c.config.DNSSearch) { resolv.searchDomains = append(resolv.searchDomains, c.Config().DNSSearch...) } } // Populate the resolv struct with user's dns servers if len(c.config.DNSServer) > 0 { resolv.nameServers = nil for _, i := range c.config.DNSServer { resolv.nameServers = append(resolv.nameServers, i.String()) } } // Populate the resolve struct with the users dns options if len(c.config.DNSOption) > 0 { resolv.options = nil resolv.options = append(resolv.options, c.Config().DNSOption...) } return c.writeStringToRundir("resolv.conf", resolv.ToString()) } // createResolv creates a resolv struct from an input string func createResolv(input string) resolvConf { var resolv resolvConf for _, line := range strings.Split(input, "\n") { if strings.HasPrefix(line, "search") { fields := strings.Fields(line) if len(fields) < 2 { logrus.Debugf("invalid resolv.conf line %s", line) continue } resolv.searchDomains = append(resolv.searchDomains, fields[1:]...) } else if strings.HasPrefix(line, "nameserver") { fields := strings.Fields(line) if len(fields) < 2 { logrus.Debugf("invalid resolv.conf line %s", line) continue } resolv.nameServers = append(resolv.nameServers, fields[1]) } else if strings.HasPrefix(line, "options") { fields := strings.Fields(line) if len(fields) < 2 { logrus.Debugf("invalid resolv.conf line %s", line) continue } resolv.options = append(resolv.options, fields[1:]...) } } return resolv } //ToString returns a resolv struct in the form of a resolv.conf func (r resolvConf) ToString() string { var result string // Populate the output string with search domains result += fmt.Sprintf("search %s\n", strings.Join(r.searchDomains, " ")) // Populate the output string with name servers for _, i := range r.nameServers { result += fmt.Sprintf("nameserver %s\n", i) } // Populate the output string with dns options for _, i := range r.options { result += fmt.Sprintf("options %s\n", i) } return result } // generateHosts creates a containers hosts file func (c *Container) generateHosts() (string, error) { orig, err := ioutil.ReadFile("/etc/hosts") if err != nil { return "", errors.Wrapf(err, "unable to read /etc/hosts") } hosts := string(orig) if len(c.config.HostAdd) > 0 { for _, host := range c.config.HostAdd { // the host format has already been verified at this point fields := strings.SplitN(host, ":", 2) hosts += fmt.Sprintf("%s %s\n", fields[1], fields[0]) } } return c.writeStringToRundir("hosts", hosts) } func (c *Container) addLocalVolumes(ctx context.Context, g *generate.Generator) error { mountPoint := c.state.Mountpoint if !c.state.Mounted { return errors.Wrapf(ErrInternal, "container is not mounted") } newImage, err := c.runtime.imageRuntime.NewFromLocal(c.config.RootfsImageID) if err != nil { return err } imageData, err := newImage.Inspect(ctx) if err != nil { return err } // Add the built-in volumes of the container passed in to --volumes-from for _, vol := range c.config.LocalVolumes { if imageData.ContainerConfig.Volumes == nil { imageData.ContainerConfig.Volumes = map[string]struct{}{ vol: {}, } } else { imageData.ContainerConfig.Volumes[vol] = struct{}{} } } for k := range imageData.ContainerConfig.Volumes { mount := spec.Mount{ Destination: k, Type: "bind", Options: []string{"rbind", "rw"}, } if MountExists(g.Mounts(), k) { continue } volumePath := filepath.Join(c.config.StaticDir, "volumes", k) srcPath := filepath.Join(mountPoint, k) var ( uid uint32 gid uint32 ) if c.config.User != "" { if !c.state.Mounted { return errors.Wrapf(ErrCtrStateInvalid, "container %s must be mounted in order to translate User field", c.ID()) } uid, gid, err = chrootuser.GetUser(c.state.Mountpoint, c.config.User) if err != nil { return err } } if _, err := os.Stat(srcPath); os.IsNotExist(err) { logrus.Infof("Volume image mount point %s does not exist in root FS, need to create it", k) if err = os.MkdirAll(srcPath, 0755); err != nil { return errors.Wrapf(err, "error creating directory %q for volume %q in container %q", volumePath, k, c.ID) } if err = os.Chown(srcPath, int(uid), int(gid)); err != nil { return errors.Wrapf(err, "error chowning directory %q for volume %q in container %q", srcPath, k, c.ID) } } if _, err := os.Stat(volumePath); os.IsNotExist(err) { if err = os.MkdirAll(volumePath, 0755); err != nil { return errors.Wrapf(err, "error creating directory %q for volume %q in container %q", volumePath, k, c.ID) } if err = os.Chown(volumePath, int(uid), int(gid)); err != nil { return errors.Wrapf(err, "error chowning directory %q for volume %q in container %q", volumePath, k, c.ID) } if err = label.Relabel(volumePath, c.config.MountLabel, false); err != nil { return errors.Wrapf(err, "error relabeling directory %q for volume %q in container %q", volumePath, k, c.ID) } if err = chrootarchive.NewArchiver(nil).CopyWithTar(srcPath, volumePath); err != nil && !os.IsNotExist(err) { return errors.Wrapf(err, "error populating directory %q for volume %q in container %q using contents of %q", volumePath, k, c.ID, srcPath) } // Set the volume path with the same owner and permission of source path sstat, _ := os.Stat(srcPath) st, ok := sstat.Sys().(*syscall.Stat_t) if !ok { return fmt.Errorf("could not convert to syscall.Stat_t") } uid := int(st.Uid) gid := int(st.Gid) if err := os.Lchown(volumePath, uid, gid); err != nil { return err } if os.Chmod(volumePath, sstat.Mode()); err != nil { return err } } mount.Source = volumePath g.AddMount(mount) } return nil } // Save OCI spec to disk, replacing any existing specs for the container func (c *Container) saveSpec(spec *spec.Spec) error { // If the OCI spec already exists, we need to replace it // Cannot guarantee some things, e.g. network namespaces, have the same // paths jsonPath := filepath.Join(c.bundlePath(), "config.json") if _, err := os.Stat(jsonPath); err != nil { if !os.IsNotExist(err) { return errors.Wrapf(err, "error doing stat on container %s spec", c.ID()) } // The spec does not exist, we're fine } else { // The spec exists, need to remove it if err := os.Remove(jsonPath); err != nil { return errors.Wrapf(err, "error replacing runtime spec for container %s", c.ID()) } } fileJSON, err := json.Marshal(spec) if err != nil { return errors.Wrapf(err, "error exporting runtime spec for container %s to JSON", c.ID()) } if err := ioutil.WriteFile(jsonPath, fileJSON, 0644); err != nil { return errors.Wrapf(err, "error writing runtime spec JSON for container %s to disk", c.ID()) } logrus.Debugf("Created OCI spec for container %s at %s", c.ID(), jsonPath) c.state.ConfigPath = jsonPath return nil } func (c *Container) setupOCIHooks(ctx context.Context, config *spec.Spec) (extensionStageHooks map[string][]spec.Hook, err error) { if c.runtime.config.HooksDir == "" { return nil, nil } var locale string var ok bool for _, envVar := range []string{ "LC_ALL", "LC_COLLATE", "LANG", } { locale, ok = os.LookupEnv(envVar) if ok { break } } langString, ok := localeToLanguage[strings.ToLower(locale)] if !ok { langString = locale } lang, err := language.Parse(langString) if err != nil { logrus.Warnf("failed to parse language %q: %s", langString, err) lang, err = language.Parse("und-u-va-posix") if err != nil { return nil, err } } manager, err := hooks.New(ctx, []string{c.runtime.config.HooksDir}, []string{"poststop"}, lang) if err != nil { if c.runtime.config.HooksDirNotExistFatal || !os.IsNotExist(err) { return nil, err } logrus.Warnf("failed to load hooks: {}", err) return nil, nil } return manager.Hooks(config, c.Spec().Annotations, len(c.config.UserVolumes) > 0) } // mount mounts the container's root filesystem func (c *Container) mount() (string, error) { mountPoint, err := c.runtime.storageService.MountContainerImage(c.ID()) if err != nil { return "", errors.Wrapf(err, "error mounting storage for container %s", c.ID()) } return mountPoint, nil } // unmount unmounts the container's root filesystem func (c *Container) unmount() error { // Also unmount storage if _, err := c.runtime.storageService.UnmountContainerImage(c.ID()); err != nil { return errors.Wrapf(err, "error unmounting container %s root filesystem", c.ID()) } return nil }