$ git clone -n https://src.fedoraproject.org/rpms/nacl.git /var/lib/mock/f41-build-1022519-18078/root/chroot_tmpdir/scmroot/nacl
Cloning into '/var/lib/mock/f41-build-1022519-18078/root/chroot_tmpdir/scmroot/nacl'...
$ git fetch origin 6b8ec38da3bec71a1cdb961543e65dd9acf1e5e8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nacl
 * [new ref]         6b8ec38da3bec71a1cdb961543e65dd9acf1e5e8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6b8ec38 Eliminate use of obsolete %patchN syntax (#2283636)