$ git clone -n https://src.fedoraproject.org/rpms/vdr.git /var/lib/mock/f41-build-1164887-21591/root/chroot_tmpdir/scmroot/vdr
Cloning into '/var/lib/mock/f41-build-1164887-21591/root/chroot_tmpdir/scmroot/vdr'...
$ git fetch origin 9cf8df4a4a8b2cd2bd5289a24cca76660a5e3be0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vdr
 * [new ref]         9cf8df4a4a8b2cd2bd5289a24cca76660a5e3be0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9cf8df4 Eliminate use of obsolete %patchN syntax (#2283636)