$ git clone -n https://src.fedoraproject.org/rpms/vapoursynth.git /var/lib/mock/f45-build-37852-718/root/chroot_tmpdir/scmroot/vapoursynth
Cloning into '/var/lib/mock/f45-build-37852-718/root/chroot_tmpdir/scmroot/vapoursynth'...
$ git fetch origin e341dc574ef2aced765a4e1501d54f8b08f42fd8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vapoursynth
 * [new ref]         e341dc574ef2aced765a4e1501d54f8b08f42fd8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e341dc5 Fix build on ppc64le