$ git clone -n https://src.fedoraproject.org/rpms/shotwell.git /var/lib/mock/f39-build-1636156-39901/root/chroot_tmpdir/scmroot/shotwell
Cloning into '/var/lib/mock/f39-build-1636156-39901/root/chroot_tmpdir/scmroot/shotwell'...
$ git fetch origin 7651b06e64bedf055c71da0bceae05781e71d48a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/shotwell
 * [new ref]         7651b06e64bedf055c71da0bceae05781e71d48a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7651b06 Update to 0.32.2