$ git clone -n https://src.fedoraproject.org/rpms/phototonic.git /var/lib/mock/f41-build-815490-149534/root/chroot_tmpdir/scmroot/phototonic
Cloning into '/var/lib/mock/f41-build-815490-149534/root/chroot_tmpdir/scmroot/phototonic'...
$ git fetch origin a7059035ea11745e97c4d03ee7cfe357ac03c4ab:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/phototonic
 * [new ref]         a7059035ea11745e97c4d03ee7cfe357ac03c4ab -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a705903 Bump to commit 12552ece9564b1452606d653be67478ec6573ca1