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+# Copyright 1999-2012 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+# $Id$
+
+# @ECLASS: depend.apache.eclass
+# @MAINTAINER:
+# apache-devs@gentoo.org
+# @BLURB: Functions to allow ebuilds to depend on apache
+# @DESCRIPTION:
+# This eclass handles depending on apache in a sane way and provides information
+# about where certain binaries and configuration files are located.
+#
+# To make use of this eclass simply call one of the need/want_apache functions
+# described below. Make sure you use the need/want_apache call after you have
+# defined DEPEND and RDEPEND. Also note that you can not rely on the automatic
+# RDEPEND=DEPEND that portage does if you use this eclass.
+#
+# See Bug 107127 for more information.
+#
+# @EXAMPLE:
+#
+# Here is an example of an ebuild depending on apache:
+#
+# @CODE
+# DEPEND="virtual/Perl-CGI"
+# RDEPEND="${DEPEND}"
+# need_apache2
+# @CODE
+#
+# Another example which demonstrates non-standard IUSE options for optional
+# apache support:
+#
+# @CODE
+# DEPEND="server? ( virtual/Perl-CGI )"
+# RDEPEND="${DEPEND}"
+# want_apache2 server
+#
+# pkg_setup() {
+# 	depend.apache_pkg_setup server
+# }
+# @CODE
+
+inherit multilib
+
+# ==============================================================================
+# INTERNAL VARIABLES
+# ==============================================================================
+
+# @ECLASS-VARIABLE: APACHE_VERSION
+# @DESCRIPTION:
+# Stores the version of apache we are going to be ebuilding.
+# This variable is set by the want/need_apache functions.
+
+# @ECLASS-VARIABLE: APXS
+# @DESCRIPTION:
+# Path to the apxs tool.
+# This variable is set by the want/need_apache functions.
+
+# @ECLASS-VARIABLE: APACHE_BIN
+# @DESCRIPTION:
+# Path to the apache binary.
+# This variable is set by the want/need_apache functions.
+
+# @ECLASS-VARIABLE: APACHE_CTL
+# @DESCRIPTION:
+# Path to the apachectl tool.
+# This variable is set by the want/need_apache functions.
+
+# @ECLASS-VARIABLE: APACHE_BASEDIR
+# @DESCRIPTION:
+# Path to the server root directory.
+# This variable is set by the want/need_apache functions.
+
+# @ECLASS-VARIABLE: APACHE_CONFDIR
+# @DESCRIPTION:
+# Path to the configuration file directory.
+# This variable is set by the want/need_apache functions.
+
+# @ECLASS-VARIABLE: APACHE_MODULES_CONFDIR
+# @DESCRIPTION:
+# Path where module configuration files are kept.
+# This variable is set by the want/need_apache functions.
+
+# @ECLASS-VARIABLE: APACHE_VHOSTS_CONFDIR
+# @DESCRIPTION:
+# Path where virtual host configuration files are kept.
+# This variable is set by the want/need_apache functions.
+
+# @ECLASS-VARIABLE: APACHE_MODULESDIR
+# @DESCRIPTION:
+# Path where we install modules.
+# This variable is set by the want/need_apache functions.
+
+# @ECLASS-VARIABLE: APACHE_DEPEND
+# @DESCRIPTION:
+# Dependencies for Apache
+APACHE_DEPEND="www-servers/apache"
+
+# @ECLASS-VARIABLE: APACHE2_DEPEND
+# @DESCRIPTION:
+# Dependencies for Apache 2.x
+APACHE2_DEPEND="=www-servers/apache-2*"
+
+# @ECLASS-VARIABLE: APACHE2_2_DEPEND
+# @DESCRIPTION:
+# Dependencies for Apache 2.2.x
+APACHE2_2_DEPEND="=www-servers/apache-2.2*"
+
+# @ECLASS-VARIABLE: APACHE2_4_DEPEND
+# @DESCRIPTION:
+# Dependencies for Apache 2.4.x
+APACHE2_4_DEPEND="=www-servers/apache-2.4*"
+
+
+# ==============================================================================
+# INTERNAL FUNCTIONS
+# ==============================================================================
+
+_init_apache2() {
+	debug-print-function $FUNCNAME $*
+
+	# WARNING: Do not use these variables with anything that is put
+	# into the dependency cache (DEPEND/RDEPEND/etc)
+	APACHE_VERSION="2"
+	APXS="/usr/sbin/apxs2"
+	APACHE_BIN="/usr/sbin/apache2"
+	APACHE_CTL="/usr/sbin/apache2ctl"
+	APACHE_INCLUDEDIR="/usr/include/apache2"
+	APACHE_BASEDIR="/usr/$(get_libdir)/apache2"
+	APACHE_CONFDIR="/etc/apache2"
+	APACHE_MODULES_CONFDIR="${APACHE_CONFDIR}/modules.d"
+	APACHE_VHOSTS_CONFDIR="${APACHE_CONFDIR}/vhosts.d"
+	APACHE_MODULESDIR="${APACHE_BASEDIR}/modules"
+}
+
+_init_no_apache() {
+	debug-print-function $FUNCNAME $*
+	APACHE_VERSION="0"
+}
+
+# ==============================================================================
+# PUBLIC FUNCTIONS
+# ==============================================================================
+
+# @FUNCTION: depend.apache_pkg_setup
+# @USAGE: [myiuse]
+# @DESCRIPTION:
+# An ebuild calls this in pkg_setup() to initialize variables for optional
+# apache-2.x support. If the myiuse parameter is not given it defaults to
+# apache2.
+depend.apache_pkg_setup() {
+	debug-print-function $FUNCNAME $*
+
+	if [[ "${EBUILD_PHASE}" != "setup" ]]; then
+		die "$FUNCNAME() should be called in pkg_setup()"
+	fi
+
+	local myiuse=${1:-apache2}
+	if has ${myiuse} ${IUSE}; then
+		if use ${myiuse}; then
+			_init_apache2
+		else
+			_init_no_apache
+		fi
+	fi
+}
+
+# @FUNCTION: want_apache
+# @USAGE: [myiuse]
+# @DESCRIPTION:
+# An ebuild calls this to get the dependency information for optional apache
+# support. If the myiuse parameter is not given it defaults to apache2.
+# An ebuild should additionally call depend.apache_pkg_setup() in pkg_setup()
+# with the same myiuse parameter.
+want_apache() {
+	debug-print-function $FUNCNAME $*
+	want_apache2 "$@"
+}
+
+# @FUNCTION: want_apache2
+# @USAGE: [myiuse]
+# @DESCRIPTION:
+# An ebuild calls this to get the dependency information for optional apache-2.x
+# support. If the myiuse parameter is not given it defaults to apache2.
+# An ebuild should additionally call depend.apache_pkg_setup() in pkg_setup()
+# with the same myiuse parameter.
+want_apache2() {
+	debug-print-function $FUNCNAME $*
+
+	local myiuse=${1:-apache2}
+	IUSE="${IUSE} ${myiuse}"
+	DEPEND="${DEPEND} ${myiuse}? ( ${APACHE2_DEPEND} )"
+	RDEPEND="${RDEPEND} ${myiuse}? ( ${APACHE2_DEPEND} )"
+}
+
+# @FUNCTION: want_apache2_2
+# @USAGE: [myiuse]
+# @DESCRIPTION:
+# An ebuild calls this to get the dependency information for optional
+# apache-2.2.x support. If the myiuse parameter is not given it defaults to
+# apache2.
+# An ebuild should additionally call depend.apache_pkg_setup() in pkg_setup()
+# with the same myiuse parameter.
+want_apache2_2() {
+	debug-print-function $FUNCNAME $*
+
+	local myiuse=${1:-apache2}
+	IUSE="${IUSE} ${myiuse}"
+	DEPEND="${DEPEND} ${myiuse}? ( ${APACHE2_2_DEPEND} )"
+	RDEPEND="${RDEPEND} ${myiuse}? ( ${APACHE2_2_DEPEND} )"
+}
+
+# @FUNCTION: need_apache
+# @DESCRIPTION:
+# An ebuild calls this to get the dependency information for apache.
+need_apache() {
+	debug-print-function $FUNCNAME $*
+	need_apache2
+}
+
+# @FUNCTION: need_apache2
+# @DESCRIPTION:
+# An ebuild calls this to get the dependency information for apache-2.x.
+need_apache2() {
+	debug-print-function $FUNCNAME $*
+
+	DEPEND="${DEPEND} ${APACHE2_DEPEND}"
+	RDEPEND="${RDEPEND} ${APACHE2_DEPEND}"
+	_init_apache2
+}
+
+# @FUNCTION: need_apache2_2
+# @DESCRIPTION:
+# An ebuild calls this to get the dependency information for apache-2.2.x.
+need_apache2_2() {
+	debug-print-function $FUNCNAME $*
+
+	DEPEND="${DEPEND} ${APACHE2_2_DEPEND}"
+	RDEPEND="${RDEPEND} ${APACHE2_2_DEPEND}"
+	_init_apache2
+}
+
+# @FUNCTION: need_apache2_4
+# @DESCRIPTION:
+# An ebuild calls this to get the dependency information for apache-2.4.x.
+need_apache2_4() {
+        debug-print-function $FUNCNAME $*
+
+        DEPEND="${DEPEND} ${APACHE2_4_DEPEND}"
+        RDEPEND="${RDEPEND} ${APACHE2_4_DEPEND}"
+        _init_apache2
+}
+
+# @FUNCTION: has_apache
+# @DESCRIPTION:
+# An ebuild calls this to get runtime variables for an indirect apache
+# dependency without USE-flag, in which case want_apache does not work.
+# DO NOT call this function in global scope.
+has_apache() {
+	debug-print-function $FUNCNAME $*
+
+	if has_version '>=www-servers/apache-2'; then
+		_init_apache2
+	else
+		_init_no_apache
+	fi
+}
+
+# @FUNCTION: has_apache_threads
+# @USAGE: [myflag]
+# @DESCRIPTION:
+# An ebuild calls this to make sure thread-safety is enabled if apache has been
+# built with a threaded MPM. If the myflag parameter is not given it defaults to
+# threads.
+has_apache_threads() {
+	debug-print-function $FUNCNAME $*
+
+	if ! built_with_use www-servers/apache threads; then
+		return
+	fi
+
+	local myflag="${1:-threads}"
+
+	if ! use ${myflag}; then
+		echo
+		eerror "You need to enable USE flag '${myflag}' to build a thread-safe version"
+		eerror "of ${CATEGORY}/${PN} for use with www-servers/apache"
+		die "Need missing USE flag '${myflag}'"
+	fi
+}
+
+# @FUNCTION: has_apache_threads_in
+# @USAGE: <myforeign> [myflag]
+# @DESCRIPTION:
+# An ebuild calls this to make sure thread-safety is enabled in a foreign
+# package if apache has been built with a threaded MPM. If the myflag parameter
+# is not given it defaults to threads.
+has_apache_threads_in() {
+	debug-print-function $FUNCNAME $*
+
+	if ! built_with_use www-servers/apache threads; then
+		return
+	fi
+
+	local myforeign="$1"
+	local myflag="${2:-threads}"
+
+	if ! built_with_use ${myforeign} ${myflag}; then
+		echo
+		eerror "You need to enable USE flag '${myflag}' in ${myforeign} to"
+		eerror "build a thread-safe version of ${CATEGORY}/${PN} for use"
+		eerror "with www-servers/apache"
+		die "Need missing USE flag '${myflag}' in ${myforeign}"
+	fi
+}
+
+EXPORT_FUNCTIONS pkg_setup