$ git clone -n https://src.fedoraproject.org/rpms/vdr-streamdev.git /var/lib/mock/f40-build-1873815-25023/root/chroot_tmpdir/scmroot/vdr-streamdev
Cloning into '/var/lib/mock/f40-build-1873815-25023/root/chroot_tmpdir/scmroot/vdr-streamdev'...
$ git fetch origin 7a7b830365f9eb2bd36ad49fd120d0926231a91f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vdr-streamdev
 * [new ref]         7a7b830365f9eb2bd36ad49fd120d0926231a91f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7a7b830 Merge branch 'rawhide' into f40