$ git clone -n https://src.fedoraproject.org/rpms/vdr-extrecmenung.git /var/lib/mock/f40-build-1518937-23913/root/chroot_tmpdir/scmroot/vdr-extrecmenung
Cloning into '/var/lib/mock/f40-build-1518937-23913/root/chroot_tmpdir/scmroot/vdr-extrecmenung'...
$ git fetch origin cef77e63504fbc791878e4868275dcf251cc3347:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vdr-extrecmenung
 * [new ref]         cef77e63504fbc791878e4868275dcf251cc3347 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cef77e6 Rebuilt for new VDR API version 2.6.8