$ git clone -n https://src.fedoraproject.org/rpms/vdr-extrecmenung.git /var/lib/mock/f40-build-804540-144553/root/chroot_tmpdir/scmroot/vdr-extrecmenung
Cloning into '/var/lib/mock/f40-build-804540-144553/root/chroot_tmpdir/scmroot/vdr-extrecmenung'...
$ git fetch origin 812a97d38641d1636605b8e731b129bd19448eeb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vdr-extrecmenung
 * [new ref]         812a97d38641d1636605b8e731b129bd19448eeb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 812a97d Update to 2.0.12