Currently can't import the volume data--I have not yet implemented how to unpack the tarred data.

If I type docker-migrate.py, I get following. I should instead get a help message with various options.

./docker-migrate.py

Traceback (most recent call last):
File "./docker-migrate.py", line 8, in
if sys.argv[1] == "export" :
IndexError: list index out of range

Those are inspired during i want to export and import those
images whose docker make build uses. If some of them have
been covered or this is not a right place to talk about them, feel free
correct me. :)

1.Support specified images import and export
(one or multiple specified images)

2.Provide an error recover method.
If an import or export returns error, records images info,
and then list them after the whole process finished.

#docker images will hide the intermediate image by default (-a option is false), so use #docker images -a would be better.
For how to generate intermediate image:
#docker pull fedora
#docker run fedora --> assume the generated container named $TMP
#docker commit $TMP fedora
#docker images will only show the new fedora, but
#docker images -a will show the hidden <none>:<none> which is the original "fedora" image

• README.md seems to explain atomic command while it should be talking about how to use docker-migrate.
• I ran docker-migrate.sh without any option and it exited without any message on the console. Put an help message. Also do error handling if right arguments are not passed in.
• I ran script with one subcommand "export" and it did something. But I have no idea where did it save images.

[root@vm2-f22 rhvgoyal-docker-migrate]# ./docker-migrate.sh export
d2a0ecffe6fa
ded7cd95e059
tar: Removing leading `/' from member names
/var/lib/docker/volumes/

• While images are being saved it would be nice to give more informative message like. "Saving image "
• There seems to be this unnecessary warning about remving leading /.
  tar: Removing leading `/' from member names
  /var/lib/docker/volumes/

Once a image CREATED includes something like
About one hour ago, it may brake if (i % 8 == 0):

Trying to save a : image by name and tag will fail.
For how to generate a : image
#docker pull fedora
#docker run fedora
#docker commit $created_above fedora
#docker images -a

I'm not sure if need open another issue, but if use "saving by id", we also need cover those images which have the same id, like
#docker tag fedora same_id
#docker images
then you will see fedora and same_id id are same