Better UX on Push / Pull

[shizhMSFT]

Enhance user experience on Push and Pull. Resolves #77.

$ oras push localhost:5000/club:party cake.txt juice.txt
Uploading be6fe1187628 juice.txt
Uploading 22af0898315a cake.txt
Pushed localhost:5000/club:party
Digest: sha256:5c46f904baecbd34f1a261e67200faed4bb0a904d152af3cdd7c9a57ac017998
$ oras pull localhost:5000/club:party
Downloaded be6fe1187628 juice.txt
Downloaded 22af0898315a cake.txt
Pulled localhost:5000/club:party
Digest: sha256:5c46f904baecbd34f1a261e67200faed4bb0a904d152af3cdd7c9a57ac017998

With verbose:

$ oras push -v localhost:5000/club:party cake.txt juice.txt
Preparing cake.txt
Preparing juice.txt
Uploading be6fe1187628 juice.txt
Uploading 22af0898315a cake.txt
Pushed localhost:5000/club:party
Digest: sha256:5c46f904baecbd34f1a261e67200faed4bb0a904d152af3cdd7c9a57ac017998
$ oras pull -v localhost:5000/club:party
WARN[0000] unknown type: application/vnd.oci.image.config.v1+json
Downloaded be6fe1187628 juice.txt
Downloaded 22af0898315a cake.txt
Pulled localhost:5000/club:party
Digest: sha256:5c46f904baecbd34f1a261e67200faed4bb0a904d152af3cdd7c9a57ac017998

Pushing / pulling without a tag is also allowed. Fixes #79.

$ oras push localhost:5000/club cake.txt juice.txt
Uploading be6fe1187628 juice.txt
Uploading 22af0898315a cake.txt
Pushed localhost:5000/club
Digest: sha256:5c46f904baecbd34f1a261e67200faed4bb0a904d152af3cdd7c9a57ac017998
$ oras pull localhost:5000/club@sha256:5c46f904baecbd34f1a261e67200faed4bb0a904d152af3cdd7c9a57ac017998
Downloaded be6fe1187628 juice.txt
Downloaded 22af0898315a cake.txt
Pulled localhost:5000/club@sha256:5c46f904baecbd34f1a261e67200faed4bb0a904d152af3cdd7c9a57ac017998
Digest: sha256:5c46f904baecbd34f1a261e67200faed4bb0a904d152af3cdd7c9a57ac017998

Note

We are not able to know whether individual file is uploaded or not as it is limited by the stable version of containerd (v1.2.6) with detailed code at here. We can have a better UX in the next version of oras once containerd has new releases (their current master branch does not limit us).

[shizhMSFT]

/test

[jdolitsky]

👍