In Copr, we generate RPM signature key pairs when a new Copr project is created. With 5 years expiration. If project lives longer than 4 years, we prolong the keypair with gpg --edit-key with 'expire 5y' to get longer validity (ie 9 years in total). The older RPMs stay unchanged (signed with old signature), the newly built RPMs are signed with the new (prolonged) signature. The thing is that after the `expire 5y` action, the pubkey we get with `--export` doesn't contain all the necessary info to validate the old signatures we historically did (before the `expire 5y` action). It seems that the old signature is stripped from `--export`ed pub key. It would be nice to have a way to `--export` not-stripped pub key, containing all the previous signatures. Either by default, or with an option, so such a pub-key can be used to validate both old and new RPMs. I'm not a GPG expert, nor an RPM expert, so I'm not sure how to design this properly. Cooperating with the RPM/RPM-SEQUOIA developers might be necessary to design this properly; this is probably crucial feature to implement RPM signatures properly long-term. This is the original issue we filled to resolve recent signature checking failures in Copr, lot of important info is there: https://github.com/rpm-software-management/rpm-sequoia/issues/50 The way we (I believe) export the pub-key using obs-signd: https://github.com/openSUSE/obs-sign/blob/c66608f79d4f48c97131840c6e5337c28e59a9d9/signd#L1027-L1029 https://github.com/openSUSE/obs-sign/blob/c66608f79d4f48c97131840c6e5337c28e59a9d9/sign.c#L1106-L1136 https://github.com/fedora-copr/copr/blob/1141e994356a319dd81ce46aa73b0e2d85aa6783/backend/copr_backend/sign.py#L67-L69 This is how we generate the keypair initially: https://github.com/fedora-copr/copr/blob/1141e994356a319dd81ce46aa73b0e2d85aa6783/keygen/src/copr_keygen/logic.py#L151 This is how we prolong the signature keypair: https://github.com/fedora-copr/copr/blob/1141e994356a319dd81ce46aa73b0e2d85aa6783/keygen/run/gpg-copr-prolong#L44-L45 https://github.com/fedora-copr/copr/blob/1141e994356a319dd81ce46aa73b0e2d85aa6783/keygen/run/gpg-copr#L19-L21 https://github.com/fedora-copr/copr/blob/1141e994356a319dd81ce46aa73b0e2d85aa6783/keygen/src/copr_keygen/gpg.py#L2-L7 Reproducible: Always
Filled upstream issue https://dev.gnupg.org/T6689
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