Add container rename support

Signed-off-by: jason yang <jasonyangshadow@gmail.com>

internal/app/wwctl/container/rename/main.go

@@ -0,0 +1,45 @@
+package rename
+
+import (
+	"fmt"
+
+	api "github.com/hpcng/warewulf/internal/pkg/api/container"
+	"github.com/hpcng/warewulf/internal/pkg/api/routes/wwapiv1"
+	"github.com/hpcng/warewulf/internal/pkg/container"
+	"github.com/hpcng/warewulf/internal/pkg/wwlog"
+	"github.com/spf13/cobra"
+)
+
+func CobraRunE(cmd *cobra.Command, args []string) (err error) {
+	if len(args) > 2 {
+		wwlog.Warn("rename only requires 2 arguments but you provided %d arguments. Hence, they will be ignored.", len(args))
+	}
+
+	crp := &wwapiv1.ContainerRenameParameter{
+		ContainerName: args[0],
+		TargetName:    args[1],
+		Build:         SetBuild,
+	}
+
+	if !container.DoesSourceExist(crp.ContainerName) {
+		return fmt.Errorf("%s source dir does not exist", crp.ContainerName)
+	}
+
+	if container.DoesSourceExist(crp.TargetName) {
+		return fmt.Errorf("an other container with the name %s already exists", crp.TargetName)
+	}
+
+	if !container.ValidName(crp.TargetName) {
+		wwlog.Error("Container name contains illegal characters : %s", crp.TargetName)
+		return
+	}
+
+	err = api.ContainerRename(crp)
+	if err != nil {
+		err = fmt.Errorf("could not rename image: %s", err.Error())
+		return
+	}
+
+	wwlog.Info("Container %s successfully renamed as %s", crp.ContainerName, crp.TargetName)
+	return
+}

internal/app/wwctl/container/rename/main_test.go

@@ -0,0 +1,63 @@
+package rename
+
+import (
+	"bytes"
+	"io"
+	"os"
+	"path"
+	"testing"
+
+	containerList "github.com/hpcng/warewulf/internal/app/wwctl/container/list"
+	"github.com/hpcng/warewulf/internal/pkg/testenv"
+	"github.com/hpcng/warewulf/internal/pkg/warewulfd"
+	"github.com/stretchr/testify/assert"
+)
+
+func Test_Rename(t *testing.T) {
+	env := testenv.New(t)
+	env.WriteFile(t, path.Join(testenv.WWChrootdir, "test-container/rootfs/file"), `test`)
+	defer env.RemoveAll(t)
+	warewulfd.SetNoDaemon()
+
+	// first we will verify that there is an existing container
+	t.Run("container list", func(t *testing.T) {
+		verifyContainerListOutput(t, "test-container")
+	})
+
+	// then rename it
+	t.Run("container rename", func(t *testing.T) {
+		baseCmd := GetCommand()
+		baseCmd.SetOut(nil)
+		baseCmd.SetErr(nil)
+		baseCmd.SetArgs([]string{"test-container", "test-container-rename"})
+		err := baseCmd.Execute()
+		assert.NoError(t, err)
+	})
+
+	// retrieve again
+	t.Run("Container list", func(t *testing.T) {
+		verifyContainerListOutput(t, "test-container-rename")
+	})
+}
+
+func verifyContainerListOutput(t *testing.T, content string) {
+	baseCmd := containerList.GetCommand()
+	baseCmd.SetOut(nil)
+	baseCmd.SetErr(nil)
+	stdoutR, stdoutW, _ := os.Pipe()
+	os.Stdout = stdoutW
+	err := baseCmd.Execute()
+	assert.NoError(t, err)
+
+	stdoutC := make(chan string)
+	go func() {
+		var buf bytes.Buffer
+		_, _ = io.Copy(&buf, stdoutR)
+		stdoutC <- buf.String()
+	}()
+	stdoutW.Close()
+
+	stdout := <-stdoutC
+	assert.NotEmpty(t, stdout, "output should not be empty")
+	assert.Contains(t, stdout, content)
+}

internal/app/wwctl/container/rename/root.go

@@ -0,0 +1,35 @@
+package rename
+
+import (
+	"github.com/hpcng/warewulf/internal/pkg/container"
+	"github.com/spf13/cobra"
+)
+
+var baseCmd = &cobra.Command{
+	DisableFlagsInUseLine: true,
+	Use:                   "rename CONTAINER NEW_NAME",
+	Aliases:               []string{"rn"},
+	Short:                 "Rename an existing container",
+	Long:                  "This command will rename an existing container.",
+	RunE:                  CobraRunE,
+	Args:                  cobra.MinimumNArgs(2),
+	ValidArgsFunction: func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
+		if len(args) != 0 {
+			return nil, cobra.ShellCompDirectiveNoFileComp
+		}
+		list, _ := container.ListSources()
+		return list, cobra.ShellCompDirectiveNoFileComp
+	},
+}
+
+var SetBuild bool
+
+func init() {
+	// Nothing to do here
+	baseCmd.PersistentFlags().BoolVarP(&SetBuild, "build", "b", false, "Build container after rename")
+}
+
+// GetRootCommand returns the root cobra.Command for the application.
+func GetCommand() *cobra.Command {
+	return baseCmd
+}

internal/app/wwctl/container/root.go

@@ -7,23 +7,22 @@ import (
 	"github.com/hpcng/warewulf/internal/app/wwctl/container/exec"
 	"github.com/hpcng/warewulf/internal/app/wwctl/container/imprt"
 	"github.com/hpcng/warewulf/internal/app/wwctl/container/list"
+	"github.com/hpcng/warewulf/internal/app/wwctl/container/rename"
 	"github.com/hpcng/warewulf/internal/app/wwctl/container/shell"
 	"github.com/hpcng/warewulf/internal/app/wwctl/container/show"
 	"github.com/hpcng/warewulf/internal/app/wwctl/container/syncuser"
 	"github.com/spf13/cobra"
 )
 
-var (
-	baseCmd = &cobra.Command{
-		DisableFlagsInUseLine: true,
-		Use:                   "container COMMAND [OPTIONS]",
-		Short:                 "Container / VNFS image management",
-		Long: "Starting with version 4, Warewulf uses containers to build the bootable VNFS\n" +
-			"node images. These commands will help you import, manage, and transform\n" +
-			"containers into bootable Warewulf VNFS images.",
-		Aliases: []string{"vnfs"},
-	}
-)
+var baseCmd = &cobra.Command{
+	DisableFlagsInUseLine: true,
+	Use:                   "container COMMAND [OPTIONS]",
+	Short:                 "Container / VNFS image management",
+	Long: "Starting with version 4, Warewulf uses containers to build the bootable VNFS\n" +
+		"node images. These commands will help you import, manage, and transform\n" +
+		"containers into bootable Warewulf VNFS images.",
+	Aliases: []string{"vnfs"},
+}
 
 func init() {
 	baseCmd.AddCommand(build.GetCommand())
@@ -35,7 +34,7 @@ func init() {
 	baseCmd.AddCommand(show.GetCommand())
 	baseCmd.AddCommand(syncuser.GetCommand())
 	baseCmd.AddCommand(copy.GetCommand())
-
+	baseCmd.AddCommand(rename.GetCommand())
 }
 
 // GetRootCommand returns the root cobra.Command for the application.