preinst is in daemontools-run 1:0.76-6ubuntu1.
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 | #!/bin/sh
set -e
test "$1" = 'remove' || exit 0
if ! test -d /run/systemd/system && test -f /etc/init/syscan.conf
then
echo 'Stopping svscan-service'
/sbin/stop svscan
fi
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