# 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
#	shlibs.subr -- update the shared library cache
#
# SYNOPSIS
#	task_shlibs [-s] add | remove
#
# DESCRIPTION
#	The task_shlibs function supports two actions: "add" and "remove".
#
#	Both the "add" and "remove" actions rebuild the system database
#	of run-time library search paths so that the system can find the
#	package's shared libraries.
#
#	The available options are as follows:
#
#	-s	Silent; don't write to standard output.
#
#	The task_shlibs function reads standard input line by line and
#	looks for lines of the form:
#
#	    # SHLIB: <directory> [...]
#
#	The directory paths are all passed as shell positional paramters
#	to the ${LDCONFIG_ADD_CMD} and ${LDCONFIG_REMOVE_CMD} command
#	lines.
#
#	If any directory paths are relative, then they are assumed to be
#	relative to ${PKG_PREFIX}.
#
# RETURN VALUES
#	Returns 0 on success, and >0 if an error occurs.
#
# ENVIRONMENT
#	The following variables are used if they are set:
#
#	LDCONFIG
#		The name or path to the ldconfig(8) utility.
#
#	LDCONFIG_ADD_CMD
#	LDCONFIG_REMOVE_CMD
#		The command-line to be invoked to update the system
#		run-time library paths cache when adding or removing
#		a package.
#
#		Possible: any shell command-line
#		Default: ${LDCONFIG}
#
#	PKGNAME
#		The name of the package.
#
#	PKG_DESTDIR
#		A "destdir" prefix that is prepended to all filessystem
#		paths.  The default value is the empty string.
#
#	PKG_PREFIX
#		The installation prefix of the package.  The default is
#		"/usr/pkg".
#
#	TASK_MSG
#		String prepended to all normal message written to
#		standard output.
#

__task_shlibs__="yes"

task_load echo
task_load quote

task_shlibs()
{
	: ${LDCONFIG_ADD_CMD:=_task_shlibs_run}
	: ${LDCONFIG_REMOVE_CMD:=_task_shlibs_run}

	: ${PKGNAME:=${0##*/}}
	: ${TASK_MSG:=""}

	local arg
	local echo="task_echo"
	local OPTIND=1
	while getopts ":s" arg "$@"; do
		case $arg in
		s)	echo=":" ;;
		*)	return 127 ;;
		esac
	done
	shift $(( ${OPTIND} - 1 ))
	[ $# -gt 0 ] || return 127

	local action="$1"; shift
	case $action in
	add|remove)
		: "valid actions" ;;
	*)	return 0 ;;
	esac

	# Guard against ${PKG_PREFIX} == "/".
	local prefix
	case ${PKG_PREFIX}/ in
	//)	prefix= ;;
	*)	prefix=${PKG_PREFIX} ;;
	esac

	local quoted paths
	paths=
	local hash tag path
	while read hash tag dirs; do
		# Filter for "# SHLIB:".
		case $hash/$tag in
		"#/SHLIB:")
			: "use this line" ;;
		*)	continue ;;
		esac
		case $dirs in
		"")	# skip lines without any required args
			continue ;;
		esac
		# Canonicalize paths.
		set -o noglob; set -- $dirs; set +o noglob
		for path; do
			case $path in
			"")	# skip empty pathnames
				continue ;;
			[!/]*)	path="$prefix/$path" ;;
			esac
			path="${PKG_DESTDIR}$path"
			task_quote "$path"
			paths="$paths $quoted"
		done
	done
	[ -n "$paths" ] || return 0

	local result=0
	case $action in
	add)	( eval set -- $paths; ${LDCONFIG_ADD_CMD} ) >/dev/null ||
			result=1 ;;
	remove)	( eval set -- $paths; ${LDCONFIG_REMOVE_CMD} ) >/dev/null ||
			result=1 ;;
	esac
	if [ $result -eq 0 ]; then
		$echo "${TASK_MSG}> shared library cache rebuilt"
	else
		$echo "${TASK_MSG}! shared library cache not rebuilt"
	fi
	return $result
}

_task_shlibs_run()
{
	: ${LDCONFIG:=ldconfig}

	${LDCONFIG}
}