This file is indexed.

postinst is in runit 2.1.1-6.2ubuntu2.

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.

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#!/bin/sh
set -e

test "$1" = 'configure' || exit 0

mv_conffile() {
  test -e "$1" || return 0
  echo "Preserving user changes to $2..." >&2
  mv -f "$2" "$2".dpkg-new
  mv -f "$1" "$2"
}

if dpkg --compare-versions "$2" lt '1.4.0-0'; then
  mv_conffile /etc/runit/getty-5/run /etc/sv/getty-5/run
  mv_conffile /etc/runit/getty-5/finish /etc/sv/getty-5/finish
  rmdir /etc/runit/getty-5 2>/dev/null || :
fi

if test -z "$2"; then
  # not upgrading
  if grep '^SV:' /etc/inittab >/dev/null; then
    if ! grep '^#-- runit begin' /etc/inittab >/dev/null; then
      cat <<\EOT >&2

There already is an SV entry in /etc/inittab.  In order to have this package
add an entry with the name SV to have runit's service supervision started
by sysvinit, you need to remove or rename the current SV entry first.

Installation failed.

EOT
      exit 1
    fi
  fi
fi

if [ -f /etc/inittab ] && ! grep '^SV:' /etc/inittab >/dev/null; then
  cp /etc/inittab /etc/inittab'{new}'
  cat >>/etc/inittab'{new}' <<-\EOT
	#-- runit begin
	SV:123456:respawn:/usr/sbin/runsvdir-start
	#-- runit end
	EOT
  mv -f /etc/inittab'{new}' /etc/inittab
fi

if ps -p 1 >/dev/null; then
  kill -s HUP 1
fi

# remove lingering debconf-managed configuration
# from versions 2.1.0-1 through 2.1.1-6.1.
if test -r /usr/share/debconf/confmodule; then
  . /usr/share/debconf/confmodule
  db_purge
fi

if [ -x /sbin/start ]; then #provided by upstart
  /sbin/start runsvdir
fi