$ git clone -n https://src.fedoraproject.org/rpms/rubygem-actionmailbox.git /var/lib/mock/f40-build-2697628-70027/root/chroot_tmpdir/scmroot/rubygem-actionmailbox
Cloning into '/var/lib/mock/f40-build-2697628-70027/root/chroot_tmpdir/scmroot/rubygem-actionmailbox'...
$ git fetch origin a67c8592a291128e0f8928e65e4cf20d047ee8ca:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-actionmailbox
 * [new ref]         a67c8592a291128e0f8928e65e4cf20d047ee8ca -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a67c859 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild