preinst is in vlc-nox 2.1.2-2build2.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | #!/bin/sh
set -e
case "$1" in
upgrade)
# Make sure /usr/share/doc/vlc-nox doesn't exist or is not a symlink
# before the unpacking (which will put the directory back) - #665743
if dpkg --compare-versions "$2" le "2.0.1-3" && test -L "/usr/share/doc/vlc-nox"; then
rm /usr/share/doc/vlc-nox
fi
;;
esac
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