$ git clone -n https://src.fedoraproject.org/rpms/kinfocenter.git /var/lib/mock/f42-build-side-1-3577588-46813/root/chroot_tmpdir/scmroot/kinfocenter
Cloning into '/var/lib/mock/f42-build-side-1-3577588-46813/root/chroot_tmpdir/scmroot/kinfocenter'...
$ git fetch origin ad68f99c8a6f8e1ffde48d1a9db01bfce83f00b4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kinfocenter
 * [new ref]         ad68f99c8a6f8e1ffde48d1a9db01bfce83f00b4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ad68f99 6.4.1