$ git clone -n https://src.fedoraproject.org/rpms/vdr-extrecmenung.git /var/lib/mock/f40-build-790427-136584/root/chroot_tmpdir/scmroot/vdr-extrecmenung
Cloning into '/var/lib/mock/f40-build-790427-136584/root/chroot_tmpdir/scmroot/vdr-extrecmenung'...
$ git fetch origin bd9b7bad905336a43aef8c158093ca5f2c9fd74b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vdr-extrecmenung
 * [new ref]         bd9b7bad905336a43aef8c158093ca5f2c9fd74b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bd9b7ba Rebuilt for new VDR API version