$ git clone -n https://src.fedoraproject.org/rpms/shotwell.git /var/lib/mock/f41-build-851914-166139/root/chroot_tmpdir/scmroot/shotwell
Cloning into '/var/lib/mock/f41-build-851914-166139/root/chroot_tmpdir/scmroot/shotwell'...
$ git fetch origin a6f25fc03341fdd0ebb0cb32ec53c0f9dd43af66:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/shotwell
 * [new ref]         a6f25fc03341fdd0ebb0cb32ec53c0f9dd43af66 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a6f25fc Update to 0.32.9