$ git clone -n https://src.fedoraproject.org/rpms/mir.git /var/lib/mock/f40-build-798175-141760/root/chroot_tmpdir/scmroot/mir
Cloning into '/var/lib/mock/f40-build-798175-141760/root/chroot_tmpdir/scmroot/mir'...
$ git fetch origin 4d8c984d8efb280a3183a2500da1a144bfdd9a1d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mir
 * [new ref]         4d8c984d8efb280a3183a2500da1a144bfdd9a1d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4d8c984 Update to 2.16.3