$ git clone -n https://src.fedoraproject.org/rpms/python-flock.git /var/lib/mock/f45-build-30737-647/root/chroot_tmpdir/scmroot/python-flock
Cloning into '/var/lib/mock/f45-build-30737-647/root/chroot_tmpdir/scmroot/python-flock'...
$ git fetch origin 86b3c2d72fea204356e6d3fb20091f7dc5990b1a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-flock
 * [new ref]         86b3c2d72fea204356e6d3fb20091f7dc5990b1a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 86b3c2d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild