$ git clone -n https://src.fedoraproject.org/rpms/vdr-extrecmenung.git /var/lib/mock/f40-build-1873840-25023/root/chroot_tmpdir/scmroot/vdr-extrecmenung
Cloning into '/var/lib/mock/f40-build-1873840-25023/root/chroot_tmpdir/scmroot/vdr-extrecmenung'...
$ git fetch origin c7bfb51f425676ef8a3ee5ddf7ab79a2b6fc67e1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vdr-extrecmenung
 * [new ref]         c7bfb51f425676ef8a3ee5ddf7ab79a2b6fc67e1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c7bfb51 Rebuilt for new VDR API version 2.6.9