$ git clone -n https://src.fedoraproject.org/rpms/nagelfar.git /var/lib/mock/f41-build-1280176-23177/root/chroot_tmpdir/scmroot/nagelfar
Cloning into '/var/lib/mock/f41-build-1280176-23177/root/chroot_tmpdir/scmroot/nagelfar'...
$ git fetch origin 6d41408eaa56d0af7abcbdc18a52fab6aa4d746f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nagelfar
 * [new ref]         6d41408eaa56d0af7abcbdc18a52fab6aa4d746f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6d41408 Eliminate use of obsolete %patchN syntax (#2283636)