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# Copyright 2010-2016 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2

inherit config multilib

DESCRIPTION="Manage php installations"
MAINTAINER="php-bugs@gentoo.org"

MODULES="cli apache2 fpm cgi phpdbg"

#
# Output a list of link names (not full paths) belonging to the given
# SAPI. These need to be updated when the user changes his active
# target.
#
# INPUT:
#
# The name of a SAPI.
#
# OUTPUT:
#
# A space-separated list of link names belonging to the given
# SAPI. For example, the "cli" SAPI has three link names: "php phpize
# php-config". The "cgi" sapi has only "php-cgi".
#
sapi_active_link_names() {
	local sapi="${1}"

	case "${sapi}" in
		apache2) echo "mod_php.so" ;;
		cli)     echo "php phpize php-config" ;;
		fpm)     echo "php-fpm" ;;
		cgi)     echo "php-cgi" ;;
		phpdbg)  echo "phpdbg"  ;;
		*)       die "invalid SAPI name: ${sapi}" ;;
	esac
}

# The link names obtained from sapi_active_link_names() all need to
# point somewhere. Usually the target is the same as the link name
# itself, but not always. This function returns the link-target for a
# given sapi, sapi-target, and link name.
#
# INPUT:
#
# The first parameter is a SAPI name. The second parameter is the
# SAPI-target name (for example, "php7.0"). The third parameter is a
# link name.
#
# OUTPUT:
#
# The name of the target (that is, file) for the given link name.
#
sapi_link_name_target() {
	local sapi="${1}"
	local target_name="${2}"
	local link_name="${3}"

	# For now, only apache2's mod_php.so gets special treatment.
	if [[ "${sapi}" == "apache2" && "${link_name}" == "mod_php.so" ]] ; then
		local major=$(parse_target_major_version "${target_name}")
		echo "libphp${major}.so"
	else
		echo "${link_name}"
	fi
}

# Each SAPI provides a few (one or more) "active" links in a
# predictable location. The target directory (where they point) is
# fixed for a given SAPI, and this function returns it.
#
# The name "target" is unfortunate, but that's the terminology that
# "ln" uses. The link_name is the name of the link on the filesystem,
# and target is where it points.
#
# INPUT:
#
# The first parameter is the name of a SAPI. The second parameter is
# the name of a target.
#
# OUTPUT:
#
# The directory to which the given SAPI's symlinks point. For example,
# the "cli" sapi has three executable symlinks and all of them point
# to executables in /usr/lib/phpX.Y/bin.
#
sapi_active_link_target_dir() {
	local sapi="${1}"
	local target="${2}"

	local link_target_dir="${EROOT}$(get_active_libdir)/${target}/bin"
	if [[ "${sapi}" == "apache2" ]] ; then
		link_target_dir+="/../apache2"
	fi

	echo "${link_target_dir}"
}


# Each SAPI provides a few (one or more) "active" links in a
# predictable location. And fortunately that location is fixed for a
# given SAPI. For example, the "cgi" SAPI has its sole active symlink,
# /usr/bin/php-cgi, in /usr/bin. Given a SAPI name, we return the
# directory where that SAPI's links are located.
#
# INPUT:
#
# The name of a SAPI.
#
# OUTPUT:
#
# The directory in which the given SAPI's symlinks are located. For
# example, the "cli" sapi has its three executable links in "/usr/bin".
#
sapi_active_link_dir() {
	local sapi="${1}"
	local bin_dir="${EROOT}/usr/bin"

	case "${sapi}" in
		apache2) echo "${EROOT}$(get_active_libdir)/apache2/modules" ;;
		cli)     echo "${bin_dir}" ;;
		fpm)     echo "${bin_dir}" ;;
		cgi)     echo "${bin_dir}" ;;
		phpdbg)  echo "${bin_dir}" ;;
		*)       die "invalid SAPI name: ${sapi}" ;;
	esac
}


# Each SAPI provides at least one "active" link in a predictable
# location.  For example, the "cgi" SAPI has its active symlink at
# /usr/bin/php-cgi. Given a SAPI name we return the path to that link.
#
# Note that SAPIs may provide more than one active link -- we return
# the path for only the first.
#
# INPUT:
#
# The name of a SAPI.
#
# OUTPUT:
#
# The path of the main symlink provided by the active version of the
# given SAPI. An error is raised if the given SAPI is not valid.
#
sapi_active_link_path() {
	local sapi="${1}"
	local dir=$(sapi_active_link_dir "${sapi}")
	local link_names=( $(sapi_active_link_names "${sapi}") )

	# Use the first link name only.
	echo "${dir}/${link_names[0]}"
}


# Parse and return the major version from a target name. For example,
# the "php5.6" target has a major version of "5".
#
# INPUT:
#
# The name of a valid PHP target, like php5.6 or php7.0.
#
# OUTPUT:
#
# A major version number. An error is raised if the given target is
# not valid.
#
parse_target_major_version() {
	local target="${1}"
	local major="${target:3:1}"
	case "${major}" in
		5|7) echo "${major}" ;;
		*)   die "invalid PHP target name: ${target}" ;;
	esac
}

cleanup_sapis() {
	local m
	local link
	for m in $MODULES ; do
		cleanup_sapi $m
	done
}

cleanup_sapi() {
	local sapi="${1}"
	local l="${sapi}_link"
	local link=${!l}
	if [[ -L $link && ! -e $link ]] ; then
		echo -n "Broken link for ${sapi}"
		if update_sapi $1 ; then
			echo ", updated version to $(get_sapi_active_target "${sapi}")"
			return
		else
			rm $link || die "failed to remove ${link}"

			return
		fi
	fi

	if [[ "${sapi}" == "apache2" ]] ; then
		rm -f "${EROOT}$(get_active_libdir)"/apache2/modules/libphp[57].so \
		   || die "failed to remove old libphp.so symlink"
	fi

	return 1
}

update_sapi() {
	local sapi="${1}"
	local target=$(find_sapi_targets "${sapi}" | tail -n 1)
	local current=$(get_sapi_active_target "${sapi}")
	[[ -z $target ]] && return 1
	[[ $current = $target ]] && return 1
	set_$sapi $target
}

get_libdirs() {
	local dir libdirs
	for dir in $(list_libdirs); do
		[[ -L ${EROOT}/usr/${dir} ]] && continue
		ls "${EROOT}"/usr/${dir}/php*.* > /dev/null 2>&1 || continue

		libdirs+=' '/usr/${dir}
	done
	echo ${libdirs:-/usr/lib}
}

get_active_libdir() {
	local dir
	for dir in $(get_libdirs); do
		echo ${dir}
		return
	done
	echo /usr/lib
}

find_targets() {
	local dir dirs libdir
	for libdir in $(get_libdirs); do
		for dir in "${EROOT}"${libdir}/php*.*; do
			t=$(basename $dir)
			has $t $dirs || dirs="${dirs} $t"
		done
	done
  echo $dirs
}

# List all valid targets for the given SAPI. The list is obtained by
# searching the filesystem for a particular (SAPI-specific) file in
# locations determined by find_targets(). This list should therefore
# be a subset of find_targets().
#
# INPUT:
#
# The name of a SAPI.
#
# OUTPUT:
#
# The "display name" of every available target for this SAPI, one per
# line. For example,
#
#   php5.6
#   php7.0
#
find_sapi_targets() {
	local sapi="${1}"

	local pattern_suffix
	case "${sapi}" in
		apache2) pattern_suffix="apache2/libphp[57].so" ;;
		cli)     pattern_suffix="bin/php"     ;;
		fpm)     pattern_suffix="bin/php-fpm" ;;
		cgi)     pattern_suffix="bin/php-cgi" ;;
		phpdbg)  pattern_suffix="bin/phpdbg"  ;;
		*)       die "invalid SAPI name: ${sapi}" ;;
	esac

	for target in $(find_targets); do
		for libdir in $(get_libdirs); do
			local pattern="${EROOT}${libdir}/${target}/${pattern_suffix}"
			for file in $pattern; do
				[[ -f "${file}" ]] && echo "${target}"
			done
		done
	done | @SORT@ | @UNIQ@
}


# Find the active (selected) target for the given SAPI. This is used
# to decorate the output of the `eselect php list <sapi>` command.
#
# INPUT:
#
# The name of a SAPI.
#
# OUTPUT:
#
# The "display name" of the active target for the given SAPI. For
# example, "php5.6" or "php7.0".
#
get_sapi_active_target() {
	local sapi="${1}"
	local active_symlink=$(sapi_active_link_path "${sapi}")

	if [[ -L "${active_symlink}" ]] ; then
		local active_file=$(canonicalise "${active_symlink}")
		if [[ -a "${active_file}" ]] ; then
			# This sed command (regular expression) finds a target name
			# contained in a filesystem path. For example, it parses
			# "php5.6" from "/usr/lib64/php5.6/apache2/libphp5.so".
			# The curly braces are an attempt to avoid '+' which is
			# a GNU extension.
			local sed_cmd='s:.*/\(php[0-9]\.[0-9]\{1,\}\)/.*:\1:p'
			echo "${active_file}" | @SED@ -ne "${sed_cmd}"
		fi
	fi
}

# Write an apache configuration file to load the active version of
# mod_php. The 5.x and 7.x series (at least...) have different module
# names, and so require a different apache configuration when
# switching between the two.
#
# INPUT:
#
# The name of the target (php5.6, php7.0) for which to write the
# configuration file.
#
# OUTPUT:
#
# None.
#
write_mod_php_conf() {
	local target="${1}"
	local conf_dir="${EROOT}"/var/lib/eselect-php
	local conf_path="${conf_dir}/mod_php.conf"

	@MKDIR_P@ "${conf_dir}" || die "failed to create ${conf_dir}"

	local major=$(parse_target_major_version "${target}")
	cat <<-EOF > "${conf_path}" || die "failed to write mod_php.conf"
	<IfModule !php${major}_module>
	    LoadModule php${major}_module modules/mod_php.so
	</IfModule>
	EOF
}


# Resolve an index or target name for a given SAPI into the "display
# name" of that target.
#
# INPUT:
#
# The first parameter is the name of a SAPI. The second parameter is
# either a number (the index of a target), or a target name.
#
# OUTPUT:
#
# The "display name" of the given target for the given SAPI. For
# example, if the first parameter is "cli" and the second parameter is
# "1", then the output will be the display name of the first target
# for the cli SAPI (e.g. "php5.6").
#
# If the index or target name is invalid (that is, does not correspond
# to one of the valid targets for the given SAPI), then nothing is
# output.
#
resolv_target() {
	local sapi="${1}"
	local target="${2}"

	# $targets is an array of things like "php5.6" and "php7.0"
	local targets=( $(find_sapi_targets "${sapi}") )

	if is_number "${target}" ; then
		if [[ $target -le ${#targets[@]} && $target -gt 0 ]] ; then
			# $target looks like an index into the $targets array.
			echo "${targets[ $(( $target - 1 )) ]}"
		fi
	elif has "${target}" ${targets[@]} ; then
		# $target is the *name* of a valid target for this SAPI.
		echo "${target}"
	fi
}


# Die if the given module name is not valid.
#
# INPUT:
#
# A module name.
#
# OUTPUT:
#
# None; the function will die() if the given module name is invalid
# (that is, not one of our declared $MODULES), and do nothing
# otherwise.
#
check_module() {
	local module="${1}"
	has "${module}" $MODULES || \
		die -q "Please choose one of the following modules: ${MODULES}"
}

## Actual actions

# Perform the "list" action for the given SAPI.
#
# INPUT:
#
# The SAPI name.
#
# OUTPUT:
#
# A numbered and decorated list of targets for the given SAPI.
#
list_sapi() {
	local sapi="${1}"
	local targets=( $(find_sapi_targets "${sapi}") )
	local active=$(get_sapi_active_target "${sapi}")

	for (( i = 0; i < ${#targets[@]}; i++ )) ; do
		if [[ $active == ${targets[i]} ]] ; then
			targets[i]=$(highlight_marker "${targets[i]}")
		fi
	done
	write_numbered_list -m "(none found)" "${targets[@]}"
}


# Perform the "set" action for the given SAPI.
#
# INPUT:
#
# The first parameter is the SAPI name, and the second parameter is
# the desired target.
#
# OUTPUT:
#
# None.
#
set_sapi() {
	local sapi="${1}"
	local target="${2}"
	local target_name=$(resolv_target "${sapi}" "${target}")
	[[ -z $target_name ]] && die -q "invalid target ${target} for SAPI ${sapi}"

	local link_tgt_dir=$(sapi_active_link_target_dir "${sapi}" "${target_name}")
	local link_dir=$(sapi_active_link_dir "${sapi}")

	for link_name in $(sapi_active_link_names "${sapi}"); do
		local link_target=$(sapi_link_name_target "${sapi}" "${target_name}" "${link_name}")

		@LN_S@ --force "${link_tgt_dir}/${link_target}" \
			"${link_dir}/${link_name}" || \
			die -q "failed to create active ${link_name} symlink"
	done
}


# Check to see if the user is still using the old-style apache
# configuration with -DPHP5 and 70_mod_php5.conf. If he is, warn him
# that it is outdated, and that his eselect choices will not have any
# effect until the configuration is updated.
#
# This can be removed after around a year.
#
apache2_php5_config_check() {
	if [ -f "${EROOT}/etc/apache2/modules.d/70_mod_php5.conf" ] ; then
		local msg
		write_warning_msg "The apache2 configuration has changed in this"
		write_warning_msg "version of eselect-php. You should define \"-D PHP\""
		write_warning_msg "and not \"-D PHP5\" for apache. The module is now"
		write_warning_msg "loaded by 70_mod_php.conf (was 70_mod_php5.conf)."
		write_warning_msg "After you have changed \"-D PHP5\" to \"-D PHP\", "
		write_warning_msg "you should remove 70_mod_php5.conf to eliminate"
		write_warning_msg "this warning. Until you have done so, your eselect"
		write_warning_msg "choices for apache2 will have no effect."
		echo
	fi
}

## set action

describe_set() {
	echo "Sets the current configuration for a module"
}

describe_set_parameters() {
	echo "<module> <target>"
}

describe_set_options() {
	echo "module:	one of ${MODULES}"
	echo "target:	Target name or number (from the 'list' action)"
}


do_set() {
	local sapi="${1}"
	local target="${2}"
	check_module "${sapi}"

	set_sapi "${sapi}" "${target}"

	if [[ "${sapi}" == "apache2" ]]; then
		apache2_php5_config_check
		write_mod_php_conf "$(resolv_target apache2 "${target}")"
		echo "Please restart apache for the changes to take effect."
	elif [[ "${sapi}" == "fpm" ]]; then
		echo "Please restart php-fpm for the changes to take effect."
	fi
}



## List action

describe_list() {
	echo "Lists available php installs for a module"
}

describe_list_parameters() {
	echo "<module>"
}

describe_list_options() {
	echo "module: one of ${MODULES}"
}

do_list() {
	local sapi="${1}"
	check_module "${sapi}"
	list_sapi "${sapi}"
}

## Show action

describe_show() {
	echo "Lists available php installs for a module"
}

describe_show_parameters() {
	echo "<module>"
}

describe_show_options() {
	echo "module: one of ${MODULES}"
}

do_show() {
	local sapi="${1}"
	check_module "${sapi}"
	get_sapi_active_target "${sapi}"
}

## update action

describe_update() {
	echo "Automatically update the php versions"
}

describe_update_parameters() {
	echo "<module> [ifunset]"
}

describe_update_options() {
	echo "module: one of ${MODULES}"
	echo "ifunset : Do not override existing implementation"
}

do_update() {
	local sapi="${1}"
	check_module "${sapi}"
	[[ -z ${2} || ( -z ${3} && ( ${2} == ifunset || ${2} == '--if-unset' ) ) ]] || \
		die -q "Usage error"

	if [[ (${2} == ifunset || ${2} == '--if-unset') && -n $(get_sapi_active_target "${sapi}") ]];
	then
		return
	fi

	update_sapi "${sapi}" || echo "Nothing to update"
}

## cleanup action

describe_cleanup() {
	echo "Automatically clean up stale links"
}

describe_cleanup_parameters() {
	echo
}

describe_cleanup_options() {
	echo
}

do_cleanup() {
	cleanup_sapis
}