preinst is in daemontools-run 1:0.76-3ubuntu3.
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 | #!/bin/sh
set -e
if test -f /etc/event.d/svscan
then
echo 'Stopping svscan-service'
# ignore error (needed to recover from broken upstart job in 1:0.76-3ubuntu2)
/sbin/stop svscan || true
fi
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