preinst is in brltty 5.5-4ubuntu2.
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 13 14 15 16 17 18 19 20 21 22 23 24 | #!/bin/sh
set -e
for i in brl-sk-all.ktb
do
dpkg-maintscript-helper rm_conffile /etc/brltty/$i 4.4-9~ brltty -- "$@"
done
# Make sure the brltty systemd service is disabled when upgrading from xenial
# or earlier, and disable it if upgrading from 5.3.1-2ubuntu4.
if [ "$1" = "upgrade" ]; then
if dpkg --compare-versions "$2" le "5.3.1-2ubuntu3"; then
if [ -f /etc/default/brltty ]; then
. /etc/default/brltty
fi
if [ -n "$RUN_BRLTTY" ] && [ "$RUN_BRLTTY" = "no" ]; then
deb-systemd-helper disable brltty.service > /dev/null || true
fi
elif [ "$2" = "5.3.1-2ubuntu4" ]; then
deb-systemd-helper disable brltty.service > /dev/null || true
fi
fi
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