# Copyright (c) 2017 The NetBSD Foundation, Inc.
# All rights reserved.
#
# This code is derived from software contributed to The NetBSD Foundation
# by Johnny C. Lam.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
# ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
# NAME
#	postremove.subr -- post-removal actions for packages
#
# SYNOPSIS
#	task_postremove <datafile>
#
# DESCRIPTION
#	The task_postremove function performs actions that SHOULD occur
#	AFTER deleting the package files:
#
#	    o Unregister shells from the system shells database.
#	    o Update fonts databases.
#	    o Rebuild the system run-time library search path database.
#	    o Update OCaml module run-time library search path database.
#	    o Remove empty directories.
#	    o Remove unused users.
#	    o Remove unused groups.
#
#	The datafile contains lines of the form:
#
#	    # <keyword>: <arg> ...
#
#	These lines are used as input to the various script functions.
#
# RETURN VALUES
#	Returns 0 on success, and >0 if an error occurs.
#

__task_postremove__="yes"

task_load directories
task_load files
task_load fonts
task_load groups
task_load info_files
task_load ocaml_findlib
task_load shells
task_load shlibs
task_load sort
task_load taskfunc
task_load users

task_postremove()
{
	[ $# -gt 0 ] || return 127
	local datafile="$1"; shift

	[ -f "$datafile" ] || return 1

	local post_actions=
	# Remove shells from the system shells database.
	post_actions="task_shells"
	# Update font databases.
	post_actions="$post_actions task_fonts"
	# Rebuild the system run-time library search path database.
	post_actions="$post_actions task_shlibs"
	# Update OCaml module run-time library search path database.
	post_actions="$post_actions task_ocaml_findlib"
	# Remove empty directories.
	post_actions="$post_actions task_directories"
	# Remove unused users.
	post_actions="$post_actions task_users"
	# Remove unused groups.
	post_actions="$post_actions task_groups"
	# Run generic package tasks.
	post_actions="$post_actions task_function"

	# Seed checks with actions from preremove, in order.
	local post_checks="task_info_files task_files"

	local result=0
	local stage="preinstall"

	local post_fn silent
	for post_fn in $post_actions; do
		case $post_fn in
		task_directories|\
		task_groups|\
		task_shells|\
		task_users)
			# These tasks should be verbose since they touch
			# system files and directories.
			silent= ;;
		*)	silent="-s" ;;
		esac
		case $post_fn in
		task_directories)
			# Reverse-sort data lines for this task.
			task_sort -r < $datafile | $post_fn $silent remove $stage ;;
		*)	$post_fn $silent remove $stage < $datafile ;;
		esac
		[ $? -eq 0 ] || result=1
		post_checks="$post_checks $post_fn"
	done

	# Run all checks after all post-removal actions have completed
	# and write messages to standard output for any checks that don't
	# pass.
	#
	for post_fn in $post_checks; do
		case $post_fn in
		task_directories)
			# Reverse-sort data lines for this task.
			task_sort -r < $datafile | $post_fn check-remove $stage ;;
		*)	$post_fn check-remove $stage < $datafile ;;
		esac
	done

	return $result
}