This file is indexed.

postinst is in avahi-autoipd 0.6.30-5ubuntu2.

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

# Move a conffile without triggering a dpkg question
mv_conffile() {
    local OLDCONFFILE="$1"
    local NEWCONFFILE="$2"

    [ -e "$OLDCONFFILE" ] || return 0

    echo "Preserving user changes to $NEWCONFFILE ..."
    mv -f "$NEWCONFFILE" "$NEWCONFFILE".dpkg-new
    mv -f "$OLDCONFFILE" "$NEWCONFFILE"
}

case "$1" in
  configure)
    if ! getent passwd avahi-autoipd >/dev/null; then
      adduser --disabled-password --quiet --system \
        --home /var/lib/avahi-autoipd \
        --gecos "Avahi autoip daemon" --group avahi-autoipd
    fi

    # When upgradig from previous versions move dhclient hooks to new location
    if dpkg --compare-versions "$2" lt "0.6.27-3ubuntu1"; then
        mv_conffile "/etc/dhcp3/dhclient-enter-hooks.d/avahi-autoipd" \
                    "/etc/dhcp/dhclient-enter-hooks.d/avahi-autoipd"
        mv_conffile "/etc/dhcp3/dhclient-exit-hooks.d/zzz_avahi-autoipd" \
                    "/etc/dhcp/dhclient-exit-hooks.d/zzz_avahi-autoipd"
    fi

    # FIXME: restart it somehow... SIGHUP?
  ;;
  abort-upgrade|abort-remove|abort-deconfigure)
  ;;
  *)
    echo "postinst called with unknown argument \`$1'" >&2
    exit 1
  ;;
esac