$ git clone -n https://src.fedoraproject.org/rpms/gcr.git /var/lib/mock/f39-build-1560031-37330/root/chroot_tmpdir/scmroot/gcr
Cloning into '/var/lib/mock/f39-build-1560031-37330/root/chroot_tmpdir/scmroot/gcr'...
$ git fetch origin a37405249187ccb834cb7f4f03795b6d0a971c38:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gcr
 * [new ref]         a37405249187ccb834cb7f4f03795b6d0a971c38 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a374052 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild