$ git clone -n https://src.fedoraproject.org/rpms/shotwell.git /var/lib/mock/f39-build-1766613-41501/root/chroot_tmpdir/scmroot/shotwell
Cloning into '/var/lib/mock/f39-build-1766613-41501/root/chroot_tmpdir/scmroot/shotwell'...
$ git fetch origin 753f2f85ee1a413edacf8077e5905e7a038a8616:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/shotwell
 * [new ref]         753f2f85ee1a413edacf8077e5905e7a038a8616 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 753f2f8 Update to 0.32.3