implement kpod rename

rename a container

Signed-off-by: Ryan Cole <rcyoalne@gmail.com>

cmd/kpod/common.go

@@ -50,6 +50,8 @@ func getConfig(c *cli.Context) (*libkpod.Config, error) {
 	if c.Bool("debug") {
 		logrus.SetLevel(logrus.DebugLevel)
 	}
-
+	if c.GlobalIsSet("runtime") {
+		config.Runtime = c.GlobalString("runtime")
+	}
 	return config, nil
 }

cmd/kpod/main.go

@@ -33,6 +33,7 @@ func main() {
 		mountCommand,
 		pullCommand,
 		pushCommand,
+		renameCommand,
 		rmiCommand,
 		saveCommand,
 		tagCommand,
@@ -56,6 +57,10 @@ func main() {
 			Name:  "runroot",
 			Usage: "path to the 'run directory' where all state information is stored",
 		},
+		cli.StringFlag{
+			Name:  "runtime",
+			Usage: "path to the OCI-compatible binary used to run containers, default is /usr/bin/runc",
+		},
 		cli.StringFlag{
 			Name:  "storage-driver, s",
 			Usage: "select which storage driver is used to manage storage of images and containers (default is overlay2)",

cmd/kpod/rename.go

@@ -0,0 +1,45 @@
+package main
+
+import (
+	"github.com/kubernetes-incubator/cri-o/libkpod"
+	"github.com/pkg/errors"
+	"github.com/urfave/cli"
+)
+
+var (
+	renameDescription = "Rename a container.  Container may be created, running, paused, or stopped"
+	renameFlags       = []cli.Flag{}
+	renameCommand     = cli.Command{
+		Name:        "rename",
+		Usage:       "rename a container",
+		Description: renameDescription,
+		Action:      renameCmd,
+		ArgsUsage:   "CONTAINER NEW-NAME",
+		Flags:       renameFlags,
+	}
+)
+
+func renameCmd(c *cli.Context) error {
+	if len(c.Args()) != 2 {
+		return errors.Errorf("Rename requires a src container name/ID and a dest container name")
+	}
+
+	config, err := getConfig(c)
+	if err != nil {
+		return errors.Wrapf(err, "Could not get config")
+	}
+	server, err := libkpod.New(config)
+	if err != nil {
+		return errors.Wrapf(err, "could not get container server")
+	}
+	err = server.Update()
+	if err != nil {
+		return errors.Wrapf(err, "could not update list of containers")
+	}
+
+	err = server.ContainerRename(c.Args().Get(0), c.Args().Get(1))
+	if err != nil {
+		return errors.Wrapf(err, "could not rename container")
+	}
+	return nil
+}

completions/bash/kpod

@@ -6,6 +6,10 @@ __kpod_list_images() {
     COMPREPLY=($(compgen -W "$(kpod images -q)" -- $cur))
 }
 
+__kpod_list_containers() {
+    COMPREPLY=($(compgen -W "$(kpod ps -aq)" -- $cur))
+}
+
 _kpod_history() {
      local options_with_args="
      --format
@@ -156,6 +160,26 @@ _kpod_push() {
     esac
 }
 
+_kpod_rename() {
+    local boolean_options="
+    --help
+    -h
+ "
+    local options_with_args="
+ "
+
+    local all_options="$options_with_args $boolean_options"
+
+    case "$cur" in
+        -*)
+            COMPREPLY=($(compgen -W "$boolean_options $options_with_args" -- "$cur"))
+            ;;
+        *)
+            __kpod_list_containers
+            ;;
+    esac
+}
+
 _kpod_rmi() {
     local boolean_options="
      --help

docs/kpod-rename.1.md

@@ -0,0 +1,24 @@
+% kpod(1) kpod-rename - Rename a container
+% Ryan Cole
+# kpod-images "1" "March 2017" "kpod"
+
+## NAME
+kpod rename - Rename a container
+
+## SYNOPSIS
+**kpod** **rename** CONTAINER NEW-NAME
+
+## DESCRIPTION
+Rename a container.  Container may be created, running, paused, or stopped
+
+## EXAMPLE
+
+kpod rename redis-container webserver
+
+kpod rename a236b9a4 mycontainer
+
+## SEE ALSO
+kpod(1)
+
+## HISTORY
+March 2017, Originally compiled by Ryan Cole <rycole@redhat.com>

docs/kpod.1.md

@@ -35,6 +35,9 @@ has the capability to debug pods/images created by crio.
 **--runroot**=**value**
    Path to the 'run directory' where all state information is stored
 
+**--runtime**=**value**
+    Path to the OCI-compatible binary used to run containers
+
 **--storage-driver, -s**=**value**
    Select which storage driver is used to manage storage of images and containers (default is overlay)
 
@@ -76,6 +79,9 @@ Pull an image from a registry
 ### push
 Push an image from local storage to elsewhere
 
+### rename
+Rename a container
+
 ### rmi
 Removes one or more locally stored images
 

libkpod/rename.go

@@ -0,0 +1,114 @@
+package libkpod
+
+import (
+	"encoding/json"
+	"path/filepath"
+
+	"k8s.io/kubernetes/pkg/kubelet/api/v1alpha1/runtime"
+
+	"github.com/docker/docker/pkg/ioutils"
+	"github.com/kubernetes-incubator/cri-o/oci"
+	"github.com/kubernetes-incubator/cri-o/pkg/annotations"
+	"github.com/opencontainers/runtime-tools/generate"
+)
+
+const configFile = "config.json"
+
+// ContainerRename renames the given container
+func (c *ContainerServer) ContainerRename(container, name string) error {
+	ctr, err := c.LookupContainer(container)
+	if err != nil {
+		return err
+	}
+
+	oldName := ctr.Name()
+	_, err = c.ReserveContainerName(ctr.ID(), name)
+	if err != nil {
+		return err
+	}
+	defer func() {
+		if err != nil {
+			c.ReleaseContainerName(name)
+		} else {
+			c.ReleaseContainerName(oldName)
+		}
+	}()
+
+	// Update state.json
+	if err = c.updateStateName(ctr, name); err != nil {
+		return err
+	}
+
+	// Update config.json
+	configRuntimePath := filepath.Join(ctr.BundlePath(), configFile)
+	if err = updateConfigName(configRuntimePath, name); err != nil {
+		return err
+	}
+	configStoragePath := filepath.Join(ctr.Dir(), configFile)
+	if err = updateConfigName(configStoragePath, name); err != nil {
+		return err
+	}
+
+	// Update containers.json
+	if err = c.store.SetNames(ctr.ID(), []string{name}); err != nil {
+		return err
+	}
+	return nil
+}
+
+func updateConfigName(configPath, name string) error {
+	specgen, err := generate.NewFromFile(configPath)
+	if err != nil {
+		return err
+	}
+	specgen.AddAnnotation(annotations.Name, name)
+	specgen.AddAnnotation(annotations.Metadata, updateMetadata(specgen.Spec().Annotations, name))
+
+	return specgen.SaveToFile(configPath, generate.ExportOptions{})
+}
+
+func (c *ContainerServer) updateStateName(ctr *oci.Container, name string) error {
+	ctr.State().Annotations[annotations.Name] = name
+	ctr.State().Annotations[annotations.Metadata] = updateMetadata(ctr.State().Annotations, name)
+	// This is taken directly from c.ContainerStateToDisk(), which can't be used because of the call to UpdateStatus() in the first line
+	jsonSource, err := ioutils.NewAtomicFileWriter(ctr.StatePath(), 0644)
+	if err != nil {
+		return err
+	}
+	defer jsonSource.Close()
+	enc := json.NewEncoder(jsonSource)
+	return enc.Encode(c.runtime.ContainerStatus(ctr))
+}
+
+// Attempts to update a metadata annotation
+func updateMetadata(specAnnotations map[string]string, name string) string {
+	oldMetadata := specAnnotations[annotations.Metadata]
+	containerType := specAnnotations[annotations.ContainerType]
+	if containerType == "container" {
+		metadata := runtime.ContainerMetadata{}
+		err := json.Unmarshal([]byte(oldMetadata), metadata)
+		if err != nil {
+			return oldMetadata
+		}
+		metadata.Name = name
+		m, err := json.Marshal(metadata)
+		if err != nil {
+			return oldMetadata
+		}
+		return string(m)
+	} else if containerType == "sandbox" {
+		metadata := runtime.PodSandboxMetadata{}
+		err := json.Unmarshal([]byte(oldMetadata), metadata)
+		if err != nil {
+			return oldMetadata
+		}
+		metadata.Name = name
+		m, err := json.Marshal(metadata)
+		if err != nil {
+			return oldMetadata
+		}
+		return string(m)
+	} else {
+		return specAnnotations[annotations.Metadata]
+	}
+}

oci/container.go

@@ -160,6 +160,11 @@ func (c *Container) Sandbox() string {
 	return c.sandbox
 }
 
+// Dir returns the the dir of the container
+func (c *Container) Dir() string {
+	return c.dir
+}
+
 // NetNsPath returns the path to the network namespace of the container.
 func (c *Container) NetNsPath() (string, error) {
 	if c.state == nil {

test/kpod_rename.bats

@@ -0,0 +1,35 @@
+#!/usr/bin/env bats
+
+load helpers
+
+IMAGE="redis:alpine"
+ROOT="$TESTDIR/crio"
+RUNROOT="$TESTDIR/crio-run"
+KPOD_OPTIONS="--root $ROOT --runroot $RUNROOT $STORAGE_OPTS"
+NEW_NAME="rename-test"
+
+function teardown() {
+    cleanup_test
+}
+
+@test "kpod rename successful" {
+    start_crio
+    run ${KPOD_BINARY} ${KPOD_OPTIONS} pull $IMAGE
+    [ "$status" -eq 0 ]
+    run crioctl pod run --config "$TESTDATA"/sandbox_config.json
+    echo "$output"
+    pod_id="$output"
+    [ "$status" -eq 0 ]
+    run crioctl ctr create --config "$TESTDATA"/container_config.json --pod "$pod_id"
+    ctr_id="$output"
+    run ${KPOD_BINARY} $KPOD_OPTIONS rename "$ctr_id" "$NEW_NAME"
+    echo "$output"
+    [ "$status" -eq 0 ]
+    run ${KPOD_BINARY} $KPOD_OPTIONS inspect "$ctr_id" --format {{.Name}}
+    echo "$output"
+    [ "$status" -eq 0 ]
+    [ "$output" == "$NEW_NAME" ]
+    cleanup_ctrs
+    cleanup_pods
+    stop_crio
+}