$ git clone -n https://src.fedoraproject.org/rpms/golang-github-gatherstars-com-jwz.git /var/lib/mock/f40-build-2577935-62294/root/chroot_tmpdir/scmroot/golang-github-gatherstars-com-jwz
Cloning into '/var/lib/mock/f40-build-2577935-62294/root/chroot_tmpdir/scmroot/golang-github-gatherstars-com-jwz'...
$ git fetch origin 8edda78e1a869dc899f796dbf0420e94e176e9cd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-gatherstars-com-jwz
 * [new ref]         8edda78e1a869dc899f796dbf0420e94e176e9cd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8edda78 Update to 1.4.0 - Closes rhbz#2261182