$ git clone -n https://src.fedoraproject.org/rpms/vdr-tvguide.git /var/lib/mock/f40-build-1898269-25068/root/chroot_tmpdir/scmroot/vdr-tvguide
Cloning into '/var/lib/mock/f40-build-1898269-25068/root/chroot_tmpdir/scmroot/vdr-tvguide'...
$ git fetch origin 164df42f9b47e306ccee323eb6a143c9ae49cf69:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vdr-tvguide
 * [new ref]         164df42f9b47e306ccee323eb6a143c9ae49cf69 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 164df42 Rebuilt for new VDR API version 2.6.9