User can select from 3 manifest types: oci, v2s1, or v2s2
skopeo copy defaults to oci manifest if the --format flag is not set
Adds option to compress blobs when saving to the directory using the dir transport
e.g skopeo copy --format v2s1 --compress-blobs docker-archive:alp.tar dir:my-directory
Signed-off-by: Urvashi Mohnani <umohnani@redhat.com>
This is added pretty much only for integration tests right now;
though, it might be useful also for non-root operation.
Also makes a tiny cleanup of contextFromGlobalOptions, removing a
variable.
The policy file is actualy indicatiting the signatures that the
user trusts. This patch changes the documentation and error messages
to indicate this trust.
Finally, load and enforce the policy.
NOTE that this breaks a simple ./skopeo from a built directory if you
don't have /etc/atomic/policy.json installed for other reasons;
use (./skopeo --policy default-policy.json) instead.
This ordinarily uses the compiled-in default, but allows per-command
override. No users yet.
Note that this adds an URL to policy documentation within
containers/image, and that URL does not exist at the moment.
A plain sha256sum and the like is insufficient because we need to strip
signatures from v2s1 manifests; so, add a subcommand.
This can be used together with (skopeo inspect --raw) to download a
manifest from a source untrusted to modify it under us; we download a
manifest once using (skopeo inspect --raw), compute a digest using
(skopeo manifest-digest), and then do all future operations using a
digest reference.
