$ git clone -n https://src.fedoraproject.org/rpms/grace.git /var/lib/mock/f41-build-1028384-18355/root/chroot_tmpdir/scmroot/grace
Cloning into '/var/lib/mock/f41-build-1028384-18355/root/chroot_tmpdir/scmroot/grace'...
$ git fetch origin a879919a96a4d564cc25245fa44d5fb94eab219e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/grace
 * [new ref]         a879919a96a4d564cc25245fa44d5fb94eab219e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a879919 Eliminate use of obsolete %patchN syntax (#2283636)