Add support for checkpoint image

This is an enhancement proposal for the checkpoint / restore feature of
Podman that enables container migration across multiple systems with
standard image distribution infrastructure.

A new option `--create-image <image>` has been added to the
`podman container checkpoint` command. This option tells Podman to
create a container image.  This is a standard image with a single layer,
tar archive, that that contains all checkpoint files. This is similar to
the current approach with checkpoint `--export`/`--import`.

This image can be pushed to a container registry and pulled on a
different system.  It can also be exported locally with `podman image
save` and inspected with `podman inspect`. Inspecting the image would
display additional information about the host and the versions of
Podman, criu, crun/runc, kernel, etc.

`podman container restore` has also been extended to support image
name or ID as input.

Suggested-by: Adrian Reber <areber@redhat.com>
Signed-off-by: Radostin Stoyanov <radostin@redhat.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/pkg/criu/criu.go b/pkg/criu/criu.go
index b54870abc..6570159d7 100644
--- a/pkg/criu/criu.go
+++ b/pkg/criu/criu.go
@@ -28,6 +28,11 @@ func CheckForCriu(version int) bool {
 	return result
 }
 
+func GetCriuVestion() (int, error) {
+	c := criu.MakeCriu()
+	return c.GetCriuVersion()
+}
+
 func MemTrack() bool {
 	features, err := criu.MakeCriu().FeatureCheck(
 		&rpc.CriuFeatures{