With SIGNING_FORMAT = ssh the OpenPGP verification path builds its
GPGSettings from the instance signing key but leaves the format empty,
so it runs `gpg -a --export` on an SSH public key path. Depending on the
local gpg setup that either exports nothing, so an OpenPGP signed commit
reports gpg.error.generate_hash instead of a missing key, or it fails
outright and logs an export error for every such commit.
Both guards are needed. The first covers SIGNING_KEY set to a path with
SIGNING_FORMAT=ssh; the second covers the shipped default
SIGNING_KEY=default, where the format comes from git's own gpg.format
and never gets reconciled with the hardcoded "openpgp". Drop either one
and a working config goes back to broken.
Also raise minimum git version to 2.18 which was already required before this change.
Fixes: https://github.com/go-gitea/gitea/issues/37452
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: silverwind <me@silverwind.io>
Per-repository signing keys have never been officially supported, as
they would require users to modify the repository’s config file.
At this point, it is clear that only global signing keys (GPG or SSH)
should be allowed. If we want to introduce per-repository signing keys
in the future, it will require a complete design proposal.
The endpoint will not be removed for repository special signing key, but
it will reference the global signing key.
---------
Signed-off-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: delvh <dev.lh@web.de>
Artem Lytkin