save and load should support multi-tag for docker-archive

The docker-archive tar files can have multiple tags for the same
image stored in it. Load pulls all the tags found in the archive
when loading a tar file. Save can oush multiple tags of the same
image to a tar archive.

Signed-off-by: umohnani8 <umohnani@redhat.com>

Closes: #819
Approved by: rhatdan

1 files changed, 5 insertions, 3 deletions

diff --git a/cmd/podman/varlink/io.projectatomic.podman.varlink b/cmd/podman/varlink/io.projectatomic.podman.varlink
index f7b54cf1c..b120edfa2 100644
--- a/cmd/podman/varlink/io.projectatomic.podman.varlink
+++ b/cmd/podman/varlink/io.projectatomic.podman.varlink
@@ -542,9 +542,11 @@ method Commit(name: string, image_name: string, changes: []string, author: strin
 method ImportImage(source: string, reference: string, message: string, changes: []string) -> (image: string)
 
 # ExportImage takes the name or ID of an image and exports it to a destination like a tarball.  There is also
-# a boolean option to force compression.  Upon completion, the ID of the image is returned. If the image cannot
-# be found in local storage, an [ImageNotFound](#ImageNotFound) error will be returned. See also [ImportImage](ImportImage).
-method ExportImage(name: string, destination: string, compress: bool) -> (image: string)
+# a booleon option to force compression.  It also takes in a string array of tags to be able to save multiple
+# tags of the same image to a tarball (each tag should be of the form <image>:<tag>).  Upon completion, the ID
+# of the image is returned. If the image cannot be found in local storage, an [ImageNotFound](#ImageNotFound)
+# error will be returned. See also [ImportImage](ImportImage).
+method ExportImage(name: string, destination: string, compress: bool, tags: []string) -> (image: string)
 
 # PullImage pulls an image from a repository to local storage.  After the pull is successful, the ID of the image
 # is returned.