/usr/share/doc/live-config/examples/live-config-foobar/configs/foobar.conf is in live-config-doc 5.20170112+deb9u1.
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 11 12 | # /etc/live/config.conf.d/foobar.conf
## live-config-foobar(7) - Additional Configuration Components for live systems
## Copyright (C) 2006-2015 Daniel Baumann <mail@daniel-baumann.ch>
## Copyright (C) 2015 John Doe <john@example.org>
##
## live-config-foobar comes with ABSOLUTELY NO WARRANTY; for details see COPYING.
## This is free software, and you are welcome to redistribute it
## under certain conditions; see COPYING for details.
EXAMPLE_FOOBAR="foobar"
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