$ git clone -n https://src.fedoraproject.org/rpms/mairix.git /var/lib/mock/f41-build-1022323-18064/root/chroot_tmpdir/scmroot/mairix
Cloning into '/var/lib/mock/f41-build-1022323-18064/root/chroot_tmpdir/scmroot/mairix'...
$ git fetch origin a3479d060ac47c33c6ae4a55a1ce0dee45869025:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mairix
 * [new ref]         a3479d060ac47c33c6ae4a55a1ce0dee45869025 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a3479d0 Eliminate use of obsolete %patchN syntax (#2283636)