$ git clone -n https://src.fedoraproject.org/rpms/vapoursynth.git /var/lib/mock/f41-build-808026-145615/root/chroot_tmpdir/scmroot/vapoursynth
Cloning into '/var/lib/mock/f41-build-808026-145615/root/chroot_tmpdir/scmroot/vapoursynth'...
$ git fetch origin 908cc71d3a6025effac5d8d54ed1b2ff50199f58:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vapoursynth
 * [new ref]         908cc71d3a6025effac5d8d54ed1b2ff50199f58 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 908cc71 Update to R68