$ git clone -n https://src.fedoraproject.org/rpms/reg.git /var/lib/mock/f38-build-709561-92901/root/chroot_tmpdir/scmroot/reg
Cloning into '/var/lib/mock/f38-build-709561-92901/root/chroot_tmpdir/scmroot/reg'...
$ git fetch origin a2592f65b5a193544f0210bf3a5b9827cc76b2c6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/reg
 * [new ref]         a2592f65b5a193544f0210bf3a5b9827cc76b2c6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a2592f6 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild