$ git clone -n https://src.fedoraproject.org/rpms/gap.git /var/lib/mock/f41-build-1208229-22498/root/chroot_tmpdir/scmroot/gap
Cloning into '/var/lib/mock/f41-build-1208229-22498/root/chroot_tmpdir/scmroot/gap'...
$ git fetch origin bf627466c1e8159675c2a63e5ef1ddf3d29f89c5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap
 * [new ref]         bf627466c1e8159675c2a63e5ef1ddf3d29f89c5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bf62746 Version 4.13.1