$ git clone -n https://src.fedoraproject.org/rpms/AMF.git /var/lib/mock/f42-build-3426609-45197/root/chroot_tmpdir/scmroot/AMF
Cloning into '/var/lib/mock/f42-build-3426609-45197/root/chroot_tmpdir/scmroot/AMF'...
$ git fetch origin 3aa1f9ac7335900aed672e7b70a38b327c31e53b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/AMF
 * [new ref]         3aa1f9ac7335900aed672e7b70a38b327c31e53b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3aa1f9a Update to 1.4.36.0