$ git clone -n https://src.fedoraproject.org/rpms/alienarena.git /var/lib/mock/f40-build-791221-137270/root/chroot_tmpdir/scmroot/alienarena
Cloning into '/var/lib/mock/f40-build-791221-137270/root/chroot_tmpdir/scmroot/alienarena'...
$ git fetch origin 3eb610ab69d1f2c2f8f686c8653047a8d9101773:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/alienarena
 * [new ref]         3eb610ab69d1f2c2f8f686c8653047a8d9101773 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3eb610a BR: minizip-devel