$ git clone -n https://src.fedoraproject.org/rpms/shotwell.git /var/lib/mock/f40-build-1466342-23686/root/chroot_tmpdir/scmroot/shotwell
Cloning into '/var/lib/mock/f40-build-1466342-23686/root/chroot_tmpdir/scmroot/shotwell'...
$ git fetch origin 26d897d4d96c14ae138bf97ad0160f2ba9800bd8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/shotwell
 * [new ref]         26d897d4d96c14ae138bf97ad0160f2ba9800bd8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 26d897d Update to 0.32.7