$ git clone -n https://src.fedoraproject.org/rpms/cawbird.git /var/lib/mock/f41-build-1465516-23647/root/chroot_tmpdir/scmroot/cawbird
Cloning into '/var/lib/mock/f41-build-1465516-23647/root/chroot_tmpdir/scmroot/cawbird'...
$ git fetch origin 64f0160c1cb78b31d5b40629da1a1589c5166c01:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cawbird
 * [new ref]         64f0160c1cb78b31d5b40629da1a1589c5166c01 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 64f0160 Abandonware