Commits on Nov 17, 2023

1. blobcacheinfo,test: blobs must be resued when pushing across registry …

   It seems we try to reuse blobs only for the specified registry, however
   we can have valid known compressed digests across registry as well
   following pr attempts to use that by doing following steps.
   
   * `CandidateLocations2` now processes all known blobs and appends them
     to returned candidates at the lowest priority. As a result when
   `TryReusingBlob` tries to process these candidates and if the blobs
   filtered by the `Opaque` set by the `transport` fail to match then
   attempt is made against all known blobs (ones which do not belong to the
   current registry).
   
   * Increase the sample set of potential blob reuse to all known
     compressed digests , also involving the one which do not belong to
   current registry.
   
   * If a blob is found match it against the registry where we are
     attempting to push. If blob is already there consider it a `CACHE
   HIT!` and reply skipping blob, since its already there.
   
   ----
   
   ```console
   $ skopeo copy docker://registry.fedoraproject.org/fedora-minimal docker://quay.io/fl/test:some-tag
   $ buildah pull registry.fedoraproject.org/fedora-minimal
   $ buildah tag registry.fedoraproject.org/fedora-minimal quay.io/fl/test
   $ buildah push quay.io/fl/test
   ```
   
   ```console
   Getting image source signatures
   Copying blob a3497ca15bbf skipped: already exists
   Copying config f7e02de757 done
   Writing manifest to image destination
   Storing signatures
   ```
   
   Testing: containers/image#1645
   
   Signed-off-by: Aditya R <arajan@redhat.com>

   

   flouthoc committed Nov 17, 2023
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