Add --ignore-rootfs option for checkpoint/restore

The newly added functionality to include the container's root
file-system changes into the checkpoint archive can now be explicitly
disabled. Either during checkpoint or during restore.

If a container changes a lot of files during its runtime it might be
more effective to migrated the root file-system changes in some other
way and to not needlessly increase the size of the checkpoint archive.

If a checkpoint archive does not contain the root file-system changes
information it will automatically be skipped. If the root file-system
changes are part of the checkpoint archive it is also possible to tell
Podman to ignore these changes.

Signed-off-by: Adrian Reber <areber@redhat.com>

3 files changed, 8 insertions, 0 deletions

diff --git a/cmd/podman/checkpoint.go b/cmd/podman/checkpoint.go
index 6755bb073..22cdb1f39 100644
--- a/cmd/podman/checkpoint.go
+++ b/cmd/podman/checkpoint.go
@@ -46,6 +46,7 @@ func init() {
 	flags.BoolVarP(&checkpointCommand.All, "all", "a", false, "Checkpoint all running containers")
 	flags.BoolVarP(&checkpointCommand.Latest, "latest", "l", false, "Act on the latest container podman is aware of")
 	flags.StringVarP(&checkpointCommand.Export, "export", "e", "", "Export the checkpoint image to a tar.gz")
+	flags.BoolVar(&checkpointCommand.IgnoreRootfs, "ignore-rootfs", false, "Do not include root file-system changes when exporting")
 	markFlagHiddenForRemoteClient("latest", flags)
 }
 
diff --git a/cmd/podman/cliconfig/config.go b/cmd/podman/cliconfig/config.go
index e3e2edb95..be380cda0 100644
--- a/cmd/podman/cliconfig/config.go
+++ b/cmd/podman/cliconfig/config.go
@@ -92,6 +92,7 @@ type CheckpointValues struct {
 	All            bool
 	Latest         bool
 	Export         string
+	IgnoreRootfs   bool
 }
 
 type CommitValues struct {
@@ -433,6 +434,7 @@ type RestoreValues struct {
 	TcpEstablished bool
 	Import         string
 	Name           string
+	IgnoreRootfs   bool
 }
 
 type RmValues struct {
diff --git a/cmd/podman/restore.go b/cmd/podman/restore.go
index 7ecec24ee..3ae141d41 100644
--- a/cmd/podman/restore.go
+++ b/cmd/podman/restore.go
@@ -45,6 +45,7 @@ func init() {
 	flags.BoolVar(&restoreCommand.TcpEstablished, "tcp-established", false, "Restore a container with established TCP connections")
 	flags.StringVarP(&restoreCommand.Import, "import", "i", "", "Restore from exported checkpoint archive (tar.gz)")
 	flags.StringVarP(&restoreCommand.Name, "name", "n", "", "Specify new name for container restored from exported checkpoint (only works with --import)")
+	flags.BoolVar(&restoreCommand.IgnoreRootfs, "ignore-rootfs", false, "Do not apply root file-system changes when importing from exported checkpoint")
 
 	markFlagHiddenForRemoteClient("latest", flags)
 }
@@ -60,6 +61,10 @@ func restoreCmd(c *cliconfig.RestoreValues, cmd *cobra.Command) error {
 	}
 	defer runtime.DeferredShutdown(false)
 
+	if c.Import == "" && c.IgnoreRootfs {
+		return errors.Errorf("--ignore-rootfs can only be used with --import")
+	}
+
 	if c.Import == "" && c.Name != "" {
 		return errors.Errorf("--name can only be used with --import")
 	}