$ git clone -n https://src.fedoraproject.org/rpms/rubygem-pg.git /var/lib/mock/f39-build-1540436-36472/root/chroot_tmpdir/scmroot/rubygem-pg
Cloning into '/var/lib/mock/f39-build-1540436-36472/root/chroot_tmpdir/scmroot/rubygem-pg'...
$ git fetch origin c01ea830cb2b24326d26d61f97580850745565bd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-pg
 * [new ref]         c01ea830cb2b24326d26d61f97580850745565bd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c01ea83 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild