As a oc-mirror user, I would like mirrored operator catalogs to reflect the mirrored operators only, so that, after I mirror my catalog I can check that it contains the filtered operators using:

oc-mirror list operators --catalog mirror.syangsao.net:8443/ocp4/redhat/redhat-operator-index:v4.12

Context

In oc-mirror v2 (and in v1 after bug fix OCPBUGS-31536), oc-mirror doesn't rebuild catalogs.

• The filtered declarative config isn't recreated based on the imagesetconfig filter
• The catalog cache isn't regenerated
• The catalog image isn't rebuilt based on the above 2 elements
  Instead, the original catalog image is pushed as is to the mirror registry. Its declarative config will show all operators, and for each operator all channels and all bundles.
  This behavior is causing some inconvenience to our users.

Concerns, complexity

• How to deal with caches
• How to deal with default channels
• How to deal with keeping a single valid channel head
• What to do when cross channel filtering is involved
• How to deal with mirroring by bundle selection (how to rebuild the update graph)
• Make multi-arch catalogs

Known ongoing/related work

• https://github.com/operator-framework/operator-registry/pull/1231/files
• https://docs.google.com/document/d/1jWRBZNPtMMbzAz71hjCKubrL_dxOBUs11xUe3QUnozo/edit
• CLID-151
• CLID-86
• CLID-87
• OPRUN-3346
• OPRUN-3347

Additional info:

• https://redhat-internal.slack.com/archives/C02JW6VCYS1/p1719601148099479
• https://redhat-internal.slack.com/archives/C02JW6VCYS1/p1719908123474019
• Naval group feedback: There is a lot of informations missing in the Operator Hub for disconnected environment, when provisioning a catalogsources, there should be an arg that stipulate that we are in a disconnected environment, and shows : name of the operator for oc-mirror, other operator dependencies, even a tab with a sample ImageSetConfig for oc-mirror to let us know easily what bundle we will need.