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>

2 files changed, 11 insertions, 0 deletions

diff --git a/pkg/adapter/containers.go b/pkg/adapter/containers.go
index 1cf9d686a..e0245d2ac 100644
--- a/pkg/adapter/containers.go
+++ b/pkg/adapter/containers.go
@@ -524,6 +524,10 @@ func (r *LocalRuntime) Checkpoint(c *cliconfig.CheckpointValues) error {
 		KeepRunning:    c.LeaveRunning,
 		TCPEstablished: c.TcpEstablished,
 		TargetFile:     c.Export,
+		IgnoreRootfs:   c.IgnoreRootfs,
+	}
+	if c.Export == "" && c.IgnoreRootfs {
+		return errors.Errorf("--ignore-rootfs can only be used with --export")
 	}
 	if c.All {
 		containers, err = r.Runtime.GetRunningContainers()
@@ -560,6 +564,7 @@ func (r *LocalRuntime) Restore(ctx context.Context, c *cliconfig.RestoreValues)
 		TCPEstablished: c.TcpEstablished,
 		TargetFile:     c.Import,
 		Name:           c.Name,
+		IgnoreRootfs:   c.IgnoreRootfs,
 	}
 
 	filterFuncs = append(filterFuncs, func(c *libpod.Container) bool {
diff --git a/pkg/adapter/containers_remote.go b/pkg/adapter/containers_remote.go
index 5836d0788..5e8df1b62 100644
--- a/pkg/adapter/containers_remote.go
+++ b/pkg/adapter/containers_remote.go
@@ -668,6 +668,9 @@ func (r *LocalRuntime) Checkpoint(c *cliconfig.CheckpointValues) error {
 	if c.Export != "" {
 		return errors.New("the remote client does not support exporting checkpoints")
 	}
+	if c.IgnoreRootfs {
+		return errors.New("the remote client does not support --ignore-rootfs")
+	}
 
 	var lastError error
 	ids, err := iopodman.GetContainersByContext().Call(r.Conn, c.All, c.Latest, c.InputArgs)
@@ -708,6 +711,9 @@ func (r *LocalRuntime) Restore(ctx context.Context, c *cliconfig.RestoreValues)
 	if c.Import != "" {
 		return errors.New("the remote client does not support importing checkpoints")
 	}
+	if c.IgnoreRootfs {
+		return errors.New("the remote client does not support --ignore-rootfs")
+	}
 
 	var lastError error
 	ids, err := iopodman.GetContainersByContext().Call(r.Conn, c.All, c.Latest, c.InputArgs)