# Copyright 1999-2006 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: /var/cvsroot/gentoo-x86/eclass/webapp.eclass,v 1.42 2006/06/15 07:01:01 stuart Exp $
#
# eclass/webapp.eclass
#				Eclass for installing applications to run under a web server
#
#				Part of the implementation of GLEP #11
#
# Author(s)		Stuart Herbert <stuart@gentoo.org>
#				Renat Lumpau <rl03@gentoo.org>
#				Gunnar Wrobel <wrobel@gentoo.org>
#
# ------------------------------------------------------------------------
#
# The master copy of this eclass is held in our subversion repository.
# http://svn.gnqs.org/projects/vhost-tools/browser/
#
# If you make changes to this file and don't tell us, chances are that
# your changes will be overwritten the next time we release a new version
# of webapp-config.
#
# ------------------------------------------------------------------------

SLOT="${PVR}"
IUSE="vhosts"
DEPEND="app-admin/webapp-config"
RDEPEND="${DEPEND}"

EXPORT_FUNCTIONS pkg_postinst pkg_setup src_install pkg_prerm

INSTALL_DIR="/${PN}"
IS_UPGRADE=0
IS_REPLACE=0

INSTALL_CHECK_FILE="installed_by_webapp_eclass"

ETC_CONFIG="${ROOT}/etc/vhosts/webapp-config"
WEBAPP_CONFIG="${ROOT}/usr/sbin/webapp-config"

# ------------------------------------------------------------------------
# INTERNAL FUNCTION - USED BY THIS ECLASS ONLY
#
# Load the config file /etc/vhosts/webapp-config
#
# Supports both the old bash version, and the new python version
#
# ------------------------------------------------------------------------

function webapp_read_config ()
{
	if has_version '>=app-admin/webapp-config-1.50'; then
		ENVVAR=$(${WEBAPP_CONFIG} --query ${PN} ${PVR}) || die "Could not read settings from webapp-config!"
		eval ${ENVVAR}
	else
		. ${ETC_CONFIG} || die "Unable to read ${ETC_CONFIG}"
	fi
}

# ------------------------------------------------------------------------
# INTERNAL FUNCTION - USED BY THIS ECLASS ONLY
#
# Check whether a specified file exists within the image/ directory
# or not.
#
# @param 	$1 - file to look for
# @param	$2 - prefix directory to use
# @return	0 on success, never returns on an error
# ------------------------------------------------------------------------

function webapp_checkfileexists ()
{
	local my_prefix

	[ -n "${2}" ] && my_prefix="${2}/" || my_prefix=

	if [ ! -e "${my_prefix}${1}" ]; then
		msg="ebuild fault: file '${1}' not found"
		eerror "$msg"
		eerror "Please report this as a bug at http://bugs.gentoo.org/"
		die "$msg"
	fi
}

# ------------------------------------------------------------------------
# INTERNAL FUNCTION - USED BY THIS ECLASS ONLY
# ------------------------------------------------------------------------

function webapp_check_installedat
{
	local my_output

	${WEBAPP_CONFIG} --show-installed -h localhost -d "${INSTALL_DIR}" 2> /dev/null
}

# ------------------------------------------------------------------------
# INTERNAL FUNCTION - USED BY THIS ECLASS ONLY
#
# ------------------------------------------------------------------------

function webapp_strip_appdir ()
{
	local my_stripped="${1}"
	echo "${1}" | sed -e "s|${MY_APPDIR}/||g;"
}

function webapp_strip_d ()
{
	echo "${1}" | sed -e "s|${D}||g;"
}

function webapp_strip_cwd ()
{
	local my_stripped="${1}"
	echo "${1}" | sed -e 's|/./|/|g;'
}

# ------------------------------------------------------------------------
# EXPORTED FUNCTION - FOR USE IN EBUILDS
#
# Identify a config file for a web-based application.
#
# @param	$1 - config file
# ------------------------------------------------------------------------

function webapp_configfile ()
{
	local m=""
	for m in "$@" ; do
		webapp_checkfileexists "${m}" "${D}"

		local MY_FILE="$(webapp_strip_appdir "${m}")"
		MY_FILE="$(webapp_strip_cwd "${MY_FILE}")"

		einfo "(config) ${MY_FILE}"
		echo "${MY_FILE}" >> ${D}/${WA_CONFIGLIST}
	done
}

# ------------------------------------------------------------------------
# EXPORTED FUNCTION - FOR USE IN EBUILDS
#
# Install a script that will run after a virtual copy is created, and
# before a virtual copy has been removed
#
# @param	$1 - the script to run
# ------------------------------------------------------------------------

function webapp_hook_script ()
{
	webapp_checkfileexists "${1}"

	einfo "(hook) ${1}"
	cp "${1}" "${D}/${MY_HOOKSCRIPTSDIR}/$(basename "${1}")" || die "Unable to install ${1} into ${D}/${MY_HOOKSCRIPTSDIR}/"
	chmod 555 "${D}/${MY_HOOKSCRIPTSDIR}/$(basename "${1}")"
}

# ------------------------------------------------------------------------
# EXPORTED FUNCTION - FOR USE IN EBUILDS
#
# Install a text file containing post-installation instructions.
#
# @param	$1 - language code (use 'en' for now)
# @param	$2 - the file to install
# ------------------------------------------------------------------------

function webapp_postinst_txt ()
{
	webapp_checkfileexists "${2}"

	einfo "(info) ${2} (lang: ${1})"
	cp "${2}" "${D}/${MY_APPDIR}/postinst-${1}.txt"
}

# ------------------------------------------------------------------------
# EXPORTED FUNCTION - FOR USE IN EBUILDS
#
# Install a text file containing post-upgrade instructions.
#
# @param	$1 - language code (use 'en' for now)
# @param	$2 - the file to install
# ------------------------------------------------------------------------

function webapp_postupgrade_txt ()
{
	webapp_checkfileexists "${2}"

	einfo "(info) ${2} (lang: ${1})"
	cp "${2}" "${D}/${MY_APPDIR}/postupgrade-${1}.txt"
}

# ------------------------------------------------------------------------
# EXPORTED FUNCTION - FOR USE IN EBUILDS
#
# Identify a file which must be owned by the webserver's user:group
# settings.
#
# The ownership of the file is NOT set until the application is installed
# using the webapp-config tool.
#
# @param	$1 - file to be owned by the webserver user:group combo
#
# ------------------------------------------------------------------------

function webapp_serverowned ()
{
	local a=""
	local m=""
	if [ "${1}" = "-R" ]; then
		shift
		for m in "$@" ; do
			for a in $(find ${D}/${m}); do
				a=${a/${D}\/\///}
				webapp_checkfileexists "${a}" "$D"
				local MY_FILE="$(webapp_strip_appdir "${a}")"
				MY_FILE="$(webapp_strip_cwd "${MY_FILE}")"

				einfo "(server owned) ${MY_FILE}"
				echo "${MY_FILE}" >> "${D}/${WA_SOLIST}"
			done
		done
	else
		for m in "$@" ; do
			webapp_checkfileexists "${m}" "$D"
			local MY_FILE="$(webapp_strip_appdir "${m}")"
			MY_FILE="$(webapp_strip_cwd "${MY_FILE}")"

			einfo "(server owned) ${MY_FILE}"
			echo "${MY_FILE}" >> "${D}/${WA_SOLIST}"
		done
	fi
}

# ------------------------------------------------------------------------
# EXPORTED FUNCTION - FOR USE IN EBUILDS
#
# @param	$1 - the webserver to install the config file for
#			     (one of apache1, apache2, cherokee)
# @param	$2 - the config file to install
# @param	$3 - new name for the config file (default is `basename $2`)
#				 this is an optional parameter
#
# NOTE:
#	this function will automagically prepend $1 to the front of your
#	config file's name
# ------------------------------------------------------------------------

function webapp_server_configfile ()
{
	webapp_checkfileexists "${2}"

	# sort out what the name will be of the config file

	local my_file

	if [ -z "${3}" ]; then
		my_file="${1}-$(basename "${2}")"
	else
		my_file="${1}-${3}"
	fi

	# warning:
	#
	# do NOT change the naming convention used here without changing all
	# the other scripts that also rely upon these names

	einfo "(${1}) config file '${my_file}'"
	cp "${2}" "${D}/${MY_SERVERCONFIGDIR}/${my_file}"
}

# ------------------------------------------------------------------------
# EXPORTED FUNCTION - FOR USE IN EBUILDS
#
# @param	$1 - the db engine that the script is for
#				 (one of: mysql|postgres)
# @param	$2 - the sql script to be installed
# @param	$3 - the older version of the app that this db script
#				 will upgrade from
#				 (do not pass this option if your SQL script only creates
#				  a new db from scratch)
# ------------------------------------------------------------------------

function webapp_sqlscript ()
{
	webapp_checkfileexists "${2}"

	# create the directory where this script will go
	#
	# scripts for specific database engines go into their own subdirectory
	# just to keep things readable on the filesystem

	if [ ! -d "${D}/${MY_SQLSCRIPTSDIR}/${1}" ]; then
		mkdir -p "${D}/${MY_SQLSCRIPTSDIR}/${1}" || die "unable to create directory ${D}/${MY_SQLSCRIPTSDIR}/${1}"
	fi

	# warning:
	#
	# do NOT change the naming convention used here without changing all
	# the other scripts that also rely upon these names

	# are we dealing with an 'upgrade'-type script?
	if [ -n "${3}" ]; then
		# yes we are
		einfo "(${1}) upgrade script from ${PN}-${PVR} to ${3}"
		cp "${2}" "${D}${MY_SQLSCRIPTSDIR}/${1}/${3}_to_${PVR}.sql"
		chmod 600 "${D}${MY_SQLSCRIPTSDIR}/${1}/${3}_to_${PVR}.sql"
	else
		# no, we are not
		einfo "(${1}) create script for ${PN}-${PVR}"
		cp "${2}" "${D}/${MY_SQLSCRIPTSDIR}/${1}/${PVR}_create.sql"
		chmod 600 "${D}/${MY_SQLSCRIPTSDIR}/${1}/${PVR}_create.sql"
	fi
}

# ------------------------------------------------------------------------
# EXPORTED FUNCTION - call from inside your ebuild's src_install AFTER
# everything else has run
#
# For now, we just make sure that root owns everything, and that there
# are no setuid files.
# ------------------------------------------------------------------------

function webapp_src_install ()
{
	chown -R "${VHOST_DEFAULT_UID}:${VHOST_DEFAULT_GID}" "${D}/"
	chmod -R u-s "${D}/"
	chmod -R g-s "${D}/"

	keepdir "${MY_PERSISTDIR}"
	fowners "root:0" "${MY_PERSISTDIR}"
	fperms 755 "${MY_PERSISTDIR}"

	# to test whether or not the ebuild has correctly called this function
	# we add an empty file to the filesystem
	#
	# we used to just set a variable in the shell script, but we can
	# no longer rely on Portage calling both webapp_src_install() and
	# webapp_pkg_postinst() within the same shell process

	touch "${D}/${MY_APPDIR}/${INSTALL_CHECK_FILE}"
}

# ------------------------------------------------------------------------
# EXPORTED FUNCTION - call from inside your ebuild's pkg_config AFTER
# everything else has run
#
# If 'vhosts' USE flag is not set, auto-install this app
#
# ------------------------------------------------------------------------

function webapp_pkg_setup ()
{
	# add sanity checks here

	if [ "${SLOT}+" != "${PVR}+" ]; then
		# special case - some ebuilds *do* need to overwride the SLOT
		if [ "${WEBAPP_MANUAL_SLOT}" != "yes" ]; then
			die "ebuild sets SLOT, overrides webapp.eclass"
		else
			ewarn
			ewarn "This ebuild overrides the default SLOT behaviour for webapps"
			ewarn "If this package installs files into the htdocs dir, this is"
			ewarn "probably a bug in the ebuild."
			ewarn
		fi
	fi

	# pull in the shared configuration file

	G_HOSTNAME="localhost"
	webapp_read_config

	# are we installing a webapp-config solution over the top of a
	# non-webapp-config solution?

	if ! use vhosts ; then
		local my_dir="${ROOT}${VHOST_ROOT}/${MY_HTDOCSBASE}/${PN}"
		local my_output

		if [ -d "${my_dir}" ] ; then
			my_output="$(webapp_check_installedat)"

			if [ "$?" != "0" ]; then
				# okay, whatever is there, it isn't webapp-config-compatible
			    ewarn "You already have something installed in ${my_dir}"
				ewarn
				ewarn "Whatever is in ${my_dir}, it's not"
				ewarn "compatible with webapp-config."
				ewarn
				ewarn "This ebuild may be overwriting important files."
				ewarn
			elif [ "$(echo ${my_output} | awk '{ print $1 }')" != "${PN}" ]; then
				eerror "${my_dir} contains ${my_output}"
				eerror "I cannot upgrade that"
				die "Cannot upgrade contents of ${my_dir}"
			fi
		fi
	fi
}

function webapp_getinstalltype ()
{
	# or are we upgrading?

	if ! use vhosts ; then
		# we only run webapp-config if vhosts USE flag is not set

		local my_output

		my_output="$(webapp_check_installedat)"

		if [ "${?}" = "0" ] ; then
			# something is already installed there
			#
			# make sure it isn't the same version

			local my_pn="$(echo ${my_output} | awk '{ print $1 }')"
			local my_pvr="$(echo ${my_output} | awk '{ print $2 }')"

			REMOVE_PKG="${my_pn}-${my_pvr}"

			if [ "${my_pn}" == "${PN}" ]; then
				if [ "${my_pvr}" != "${PVR}" ]; then
					einfo "This is an upgrade"
					IS_UPGRADE=1
				else
					einfo "This is a re-installation"
					IS_REPLACE=1
				fi
			else
				einfo "${my_output} is installed there"
			fi
		else
			einfo "This is an installation"
		fi
	fi
}

function webapp_src_preinst ()
{
	# create the directories that we need

	dodir "${MY_HTDOCSDIR}"
	dodir "${MY_HOSTROOTDIR}"
	dodir "${MY_CGIBINDIR}"
	dodir "${MY_ICONSDIR}"
	dodir "${MY_ERRORSDIR}"
	dodir "${MY_SQLSCRIPTSDIR}"
	dodir "${MY_HOOKSCRIPTSDIR}"
	dodir "${MY_SERVERCONFIGDIR}"
}

function webapp_pkg_postinst ()
{
	webapp_read_config

	# sanity checks, to catch bugs in the ebuild

	if [ ! -f "${ROOT}${MY_APPDIR}/${INSTALL_CHECK_FILE}" ]; then
		eerror
		eerror "This ebuild did not call webapp_src_install() at the end"
		eerror "of the src_install() function"
		eerror
		eerror "Please log a bug on http://bugs.gentoo.org"
		eerror
		eerror "You should use emerge -C to remove this package, as the"
		eerror "installation is incomplete"
		eerror
		die "Ebuild did not call webapp_src_install() - report to http://bugs.gentoo.org"
	fi

	# if 'vhosts' is not set in your USE flags, we install a copy of
	# this application in ${ROOT}/var/www/localhost/htdocs/${PN}/ for you

	if ! use vhosts ; then
		echo
		einfo "vhosts USE flag not set - auto-installing using webapp-config"

		webapp_getinstalltype

		G_HOSTNAME="localhost"
		local my_mode=-I
		webapp_read_config

		if [ "${IS_REPLACE}" = "1" ]; then
			einfo "${PN}-${PVR} is already installed - replacing"
			my_mode=-I
		elif [ "${IS_UPGRADE}" = "1" ]; then
			einfo "${REMOVE_PKG} is already installed - upgrading"
			my_mode=-U
		else
			einfo "${PN}-${PVR} is not installed - using install mode"
		fi

		my_cmd="${WEBAPP_CONFIG} ${my_mode} -h localhost -u root -d ${INSTALL_DIR} ${PN} ${PVR}"
		einfo "Running ${my_cmd}"
		${my_cmd}

		# remove the old version
		#
		# why do we do this?  well ...
		#
		# normally, emerge -u installs a new version and then removes the
		# old version.  however, if the new version goes into a different
		# slot to the old version, then the old version gets left behind
		#
		# if USE=-vhosts, then we want to remove the old version, because
		# the user is relying on portage to do the magical thing for it

		if [ "${IS_UPGRADE}" = "1" ] ; then
			einfo "Removing old version ${REMOVE_PKG}"

			emerge -C "${REMOVE_PKG}"
		fi
	else
		# vhosts flag is on
		#
		# let's tell the administrator what to do next

		einfo
		einfo "The 'vhosts' USE flag is switched ON"
		einfo "This means that Portage will not automatically run webapp-config to"
		einfo "complete the installation."
		einfo
		einfo "To install ${PN}-${PVR} into a virtual host, run the following command:"
		einfo
		einfo "    webapp-config -I -h <host> -d ${PN} ${PN} ${PVR}"
		einfo
		einfo "For more details, see the webapp-config(8) man page"
	fi

	return 0
}

function webapp_pkg_prerm ()
{
	# remove any virtual installs that there are

	local my_output
	local x

	my_output="$(${WEBAPP_CONFIG} --list-installs ${PN} ${PVR})"

	if [ "${?}" != "0" ]; then
		return
	fi

	for x in ${my_output} ; do
		[ -f ${x}/.webapp ] && . ${x}/.webapp || ewarn "Cannot find file ${x}/.webapp"

		if [ -z "${WEB_HOSTNAME}" -o -z "${WEB_INSTALLDIR}" ]; then
			ewarn "Don't forget to use webapp-config to remove the copy of"
			ewarn "${PN}-${PVR} installed in"
			ewarn
			ewarn "    ${x}"
			ewarn
		else
			# we have enough information to remove the virtual copy ourself

			${WEBAPP_CONFIG} -C -h ${WEB_HOSTNAME} -d ${WEB_INSTALLDIR}

			# if the removal fails - we carry on anyway!
		fi
	done
}