Add commands to mount/unmount image from ref

Example: ```terminal $ mkdir /opt/busybox $ ctr image mount docker.io/library/busybox:latest /opt/busybox /opt/busybox $ ls -lh /opt/busybox total 40K drwxr-xr-x 2 root root 12K Apr 14 01:10 bin drwxr-xr-x 2 root root 4.0K Apr 14 01:10 dev drwxr-xr-x 3 root root 4.0K Apr 14 01:10 etc drwxr-xr-x 2 nobody nogroup 4.0K Apr 14 01:10 home drwx------ 2 root root 4.0K Apr 14 01:10 root drwxrwxrwt 2 root root 4.0K Apr 14 01:10 tmp drwxr-xr-x 3 root root 4.0K Apr 14 01:10 usr drwxr-xr-x 4 root root 4.0K Apr 14 01:10 var $ ctr image unmount /opt/busybox $ ls -lh /opt/busybox total 0 ``` Signed-off-by: Brian Goff <cpuguy83@gmail.com>
2020-04-25 16:00:06 -07:00
parent 36952e989a
commit 98b30f4690
3 changed files with 218 additions and 0 deletions
--- a/cmd/ctr/commands/images/unmount.go
+++ b/cmd/ctr/commands/images/unmount.go
@@ -0,0 +1,73 @@
+package images
+
+import (
+	"fmt"
+
+	"github.com/containerd/containerd/cmd/ctr/commands"
+	"github.com/containerd/containerd/errdefs"
+	"github.com/containerd/containerd/leases"
+	"github.com/containerd/containerd/mount"
+	"github.com/pkg/errors"
+	"github.com/urfave/cli"
+)
+
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+var unmountCommand = cli.Command{
+	Name:        "unmount",
+	Usage:       "unmount the image from the target",
+	ArgsUsage:   "[flags] <target>",
+	Description: "Unmount the image rootfs from the specified target.",
+	Flags: append(append(commands.RegistryFlags, append(commands.SnapshotterFlags, commands.LabelFlag)...),
+		cli.BoolFlag{
+			Name:  "rm",
+			Usage: "remove the snapshot after a successful unmount",
+		},
+	),
+	Action: func(context *cli.Context) error {
+		var (
+			target = context.Args().First()
+		)
+		if target == "" {
+			return fmt.Errorf("please provide a target path to mount to")
+		}
+
+		client, ctx, cancel, err := commands.NewClient(context)
+		if err != nil {
+			return err
+		}
+		defer cancel()
+
+		if err := mount.UnmountAll(target, 0); err != nil {
+			return err
+		}
+
+		if context.Bool("rm") {
+			snapshotter := context.String("snapshotter")
+			s := client.SnapshotService(snapshotter)
+			if err := client.LeasesService().Delete(ctx, leases.Lease{ID: target}); err != nil && !errdefs.IsNotFound(err) {
+				return errors.Wrap(err, "error deleting lease")
+			}
+			if err := s.Remove(ctx, target); err != nil && !errdefs.IsNotFound(err) {
+				return errors.Wrap(err, "error removing snapshot")
+			}
+		}
+
+		fmt.Fprintln(context.App.Writer, target)
+		return nil
+	},
+}