migration: add possibility to restore a container with a new name

The option to restore a container from an external checkpoint archive
(podman container restore -i /tmp/checkpoint.tar.gz) restores a
container with the same name and same ID as id had before checkpointing.

This commit adds the option '--name,-n' to 'podman container restore'.
With this option the restored container gets the name specified after
'--name,-n' and a new ID. This way it is possible to restore one
container multiple times.

If a container is restored with a new name Podman will not try to
request the same IP address for the container as it had during
checkpointing. This implicitly assumes that if a container is restored
from a checkpoint archive with a different name, that it will be
restored multiple times and restoring a container multiple times with
the same IP address will fail as each IP address can only be used once.

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

1 files changed, 4 insertions, 0 deletions

diff --git a/libpod/container_api.go b/libpod/container_api.go
index 72c4d7f37..c27cb85ea 100644
--- a/libpod/container_api.go
+++ b/libpod/container_api.go
@@ -820,6 +820,10 @@ type ContainerCheckpointOptions struct {
 	// Import tells the API to read the checkpoint image from
 	// the filename set in TargetFile
 	TargetFile string
+	// Name tells the API that during restore from an exported
+	// checkpoint archive a new name should be used for the
+	// restored container
+	Name string
 }
 
 // Checkpoint checkpoints a container