$ git clone -n https://src.fedoraproject.org/rpms/golang-uber-atomic.git /var/lib/mock/f45-build-12771-443/root/chroot_tmpdir/scmroot/golang-uber-atomic
Cloning into '/var/lib/mock/f45-build-12771-443/root/chroot_tmpdir/scmroot/golang-uber-atomic'...
$ git fetch origin 4cb6e04fcc8e54beea8e56bbd558dc636d8002ae:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-uber-atomic
 * [new ref]         4cb6e04fcc8e54beea8e56bbd558dc636d8002ae -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4cb6e04 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild