/usr/share/ltsp/plugins/ltsp-build-client/Gentoo/030-set-video-cards is in ltsp-server 5.4.2-6+deb7u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | case "$MODE" in
commandline)
add_option "video-cards" "`eval_gettext "Set video card drivers to install"`" "advanced" "true"
;;
configure)
if [ -n "$option_video_cards_value" ] || [ -n "$VIDEO_CARDS" ]; then
VIDEO_CARDS="${option_video_cards_value:-$VIDEO_CARDS}"
fi
;;
esac
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