Images are pruned automatically from the target mirror registry if they are no longer included in the latest image set that was generated and mirrored.
Moreover, the customer can use oc-mirror plug-in as an one tool for mirror-registry management such as updating contents or pruning contents.

"4.13.0-202305171615.p0.gaee430b.assembly.stream-aee430b"

0. Install a mirror registry with the command starting with "/mirror-registry install -v --quayStorage /opt/quay/quay-storage --pgStorage /opt/quay/pg-storage ..."

1. mirror and publish A operator and B operator with a ImageSetConfiguration file to a mirror registry which is in disconnected environment.

2. mirror and publish A operator and C operator with a new ImageSetConfiguration file to the mirror registry.

3. At the end of step 2, there is "MANIFEST_UNKNOWN: manifest unknown; map[]" error and no imageContentSourcePolicy.yaml and no catalogSource-*.yaml are generated.

[1] Refer Doc: https://docs.openshift.com/container-platform/4.13/installing/disconnected_install/installing-mirroring-disconnected.html#mirroring-image-set-full

- I'm just sharing command that I ran in my lab.

1. Mirroring from mirror to disk
# oc-mirror --config=test1-imageset.yaml file:///tmp/ubi-image

2. Mirroring from disk to mirror
# oc-mirror --from=/tmp/ubi-image/mirror_seq1_000000.tar docker://mirror.ocp-svc.hyupark.com:8443

3. Mirroring of a new operator to disk
# oc-mirror --config=test2-imageset.yaml file:///tmp/ubi-image

4. Mirroring from disk to mirror
# oc-mirror --from=/tmp/ubi-image/mirror_seq2_000000.tar docker://mirror.ocp-svc.hyupark.com:8443

1. There is 'MANIFEST_UNKNOWN' log at the end of publishing.

Deleting manifest sha256:fa36283092c27cd60761703d1eee07b92358dfe1157273b51b37b583a6060b35 from repo openshift-logging/elasticsearch-rhel8-operator
Deleting manifest sha256:d3df7e62f2b1893b4f4879b91531b92652547aa4453fd1bfdc9558ff5a720a84 from repo openshift-logging/logging-curator5-rhel8
Deleting manifest sha256:d65d8fba95e2313eb97a925c2d4f2a76d3616626c492803d19dcc3548753ecfa from repo openshift-logging/logging-curator5-rhel8
...
repo "openshift-logging/elasticsearch-rhel8-operator" manifest sha256:fa36283092c27cd60761703d1eee07b92358dfe1157273b51b37b583a6060b35: DELETE https://mirror.ocp-svc.hyupark.com:8443/v2/openshift-logging/elasticsearch-rhel8-operator/manifests/sha256:fa36283092c27cd60761703d1eee07b92358dfe1157273b51b37b583a6060b35: MANIFEST_UNKNOWN: manifest unknown; map[]
repo "openshift-logging/logging-curator5-rhel8" manifest sha256:d3df7e62f2b1893b4f4879b91531b92652547aa4453fd1bfdc9558ff5a720a84: DELETE https://mirror.ocp-svc.hyupark.com:8443/v2/openshift-logging/logging-curator5-rhel8/manifests/sha256:d3df7e62f2b1893b4f4879b91531b92652547aa4453fd1bfdc9558ff5a720a84: MANIFEST_UNKNOWN: manifest unknown; map[]
repo "openshift-logging/logging-curator5-rhel8" manifest sha256:d65d8fba95e2313eb97a925c2d4f2a76d3616626c492803d19dcc3548753ecfa: DELETE https://mirror.ocp-svc.hyupark.com:8443/v2/openshift-logging/logging-curator5-rhel8/manifests/sha256:d65d8fba95e2313eb97a925c2d4f2a76d3616626c492803d19dcc3548753ecfa: MANIFEST_UNKNOWN: manifest unknown; map[]



2. The imageContentSourcePolicy.yaml and catalogSource-*.yaml were not generated.

- A previous package 'elasticsearch-operator' should be successfully pruned from the mirror-registry..

- Updated an imageContentSourcePolicy.yaml and an catalogSource-*.yaml should be generated under the path '~/oc-mirror-workspace/'

- These are the ImageSetConfiguration files that I used for the test.

# cat test1-imageset.yaml
kind: ImageSetConfiguration
apiVersion: mirror.openshift.io/v1alpha2
storageConfig:
  local:
    path: /root/olm-mirror/olm412
mirror:
  operators:
  - catalog: registry.redhat.io/redhat/redhat-operator-index:v4.12
    packages:
    - name: cluster-logging
      channels:
      - name: stable
    - name: elasticsearch-operator
      channels:
      - name: stable



# cat test2-imageset.yaml
kind: ImageSetConfiguration
apiVersion: mirror.openshift.io/v1alpha2
storageConfig:
  local:
    path: /root/olm-mirror/olm412
mirror:
  operators:
  - catalog: registry.redhat.io/redhat/redhat-operator-index:v4.12
    packages:
    - name: cluster-logging
      channels:
      - name: stable
    - name: file-integrity-operator
      channels:
      - name: stable