$ git clone -n https://src.fedoraproject.org/rpms/gap-pkg-alnuth.git /var/lib/mock/f40-build-2590467-62622/root/chroot_tmpdir/scmroot/gap-pkg-alnuth
Cloning into '/var/lib/mock/f40-build-2590467-62622/root/chroot_tmpdir/scmroot/gap-pkg-alnuth'...
$ git fetch origin ef1456c842728325ba28f2c5b68d41b04c51e709:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap-pkg-alnuth
 * [new ref]         ef1456c842728325ba28f2c5b68d41b04c51e709 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ef1456c Rebuild for gap 4.13.0