$ git clone -n https://src.fedoraproject.org/rpms/libva-nvidia-driver.git /var/lib/mock/f42-build-3494593-45873/root/chroot_tmpdir/scmroot/libva-nvidia-driver
Cloning into '/var/lib/mock/f42-build-3494593-45873/root/chroot_tmpdir/scmroot/libva-nvidia-driver'...
$ git fetch origin e022c9537170acd4c4bb468d7dfb36f4ac9a888b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libva-nvidia-driver
 * [new ref]         e022c9537170acd4c4bb468d7dfb36f4ac9a888b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e022c95 Update to latest snapshot