$ git clone -n https://src.fedoraproject.org/rpms/golang-github-prometheus-prom2json.git /var/lib/mock/f40-build-2214989-52402/root/chroot_tmpdir/scmroot/golang-github-prometheus-prom2json
Cloning into '/var/lib/mock/f40-build-2214989-52402/root/chroot_tmpdir/scmroot/golang-github-prometheus-prom2json'...
$ git fetch origin 4cd7c055380e978ff1eefe85de6d5975bd95ccd8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-prometheus-prom2json
 * [new ref]         4cd7c055380e978ff1eefe85de6d5975bd95ccd8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4cd7c05 Update to 1.3.3 - Closes rhbz#2076982 rhbz#2248331 rhbz#2163210