$ git clone -n https://src.fedoraproject.org/rpms/golang-github-benbjohnson-clock.git /var/lib/mock/f45-build-11758-434/root/chroot_tmpdir/scmroot/golang-github-benbjohnson-clock
Cloning into '/var/lib/mock/f45-build-11758-434/root/chroot_tmpdir/scmroot/golang-github-benbjohnson-clock'...
$ git fetch origin b3046bfd2988ab02096137c1e29b0bdf03e021fc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-benbjohnson-clock
 * [new ref]         b3046bfd2988ab02096137c1e29b0bdf03e021fc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b3046bf Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild