$ git clone -n https://src.fedoraproject.org/rpms/unar.git /var/lib/mock/f41-build-783306-13570/root/chroot_tmpdir/scmroot/unar
Cloning into '/var/lib/mock/f41-build-783306-13570/root/chroot_tmpdir/scmroot/unar'...
$ git fetch origin 4af249787b76e8b9ae597f242c8a27af291b6aa7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/unar
 * [new ref]         4af249787b76e8b9ae597f242c8a27af291b6aa7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4af2497 Eliminate use of obsolete %patchN syntax (#2283636)