$ git clone -n https://src.fedoraproject.org/rpms/vdr-live.git /var/lib/mock/f40-build-796472-140694/root/chroot_tmpdir/scmroot/vdr-live
Cloning into '/var/lib/mock/f40-build-796472-140694/root/chroot_tmpdir/scmroot/vdr-live'...
$ git fetch origin f6b5a19ddf323471347ff57634384b3cbfd5b04c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vdr-live
 * [new ref]         f6b5a19ddf323471347ff57634384b3cbfd5b04c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f6b5a19 Rebuilt for new VDR API version