$ git clone -n https://src.fedoraproject.org/rpms/heimdall.git /var/lib/mock/f41-build-858126-168313/root/chroot_tmpdir/scmroot/heimdall
Cloning into '/var/lib/mock/f41-build-858126-168313/root/chroot_tmpdir/scmroot/heimdall'...
$ git fetch origin 04b67330458f42f70e03fa094ac7add8e3705322:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/heimdall
 * [new ref]         04b67330458f42f70e03fa094ac7add8e3705322 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 04b6733 Update upstream URL