$ git clone -n https://src.fedoraproject.org/rpms/gap-pkg-ace.git /var/lib/mock/f45-build-9428-403/root/chroot_tmpdir/scmroot/gap-pkg-ace
Cloning into '/var/lib/mock/f45-build-9428-403/root/chroot_tmpdir/scmroot/gap-pkg-ace'...
$ git fetch origin 8120ee1114d1199a85eba701f424ba4518f10ce9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap-pkg-ace
 * [new ref]         8120ee1114d1199a85eba701f424ba4518f10ce9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8120ee1 Version 5.7.0