$ git clone -n https://src.fedoraproject.org/rpms/shotwell.git /var/lib/mock/f41-build-844308-162499/root/chroot_tmpdir/scmroot/shotwell
Cloning into '/var/lib/mock/f41-build-844308-162499/root/chroot_tmpdir/scmroot/shotwell'...
$ git fetch origin b81a6fdec87f4ee1b8b932df6100fffe94a636ed:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/shotwell
 * [new ref]         b81a6fdec87f4ee1b8b932df6100fffe94a636ed -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b81a6fd Update to 0.32.8