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docker, BlobInfoCache: try to reuse compressed blobs when pushing acr…
…oss registries 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. How to verify this ? * Remove all images `buildah rmi --all` // needed so all new blobs can be tagged again in common bucket * Remove any previous `blob-info-cache` by ```console rm /home/<user>/.local/share/containers/cache/blob-info-cache-v1.boltdb ``` ```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 ``` Signed-off-by: Aditya R <arajan@redhat.com>
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