install/install_apxs.sh - incubator-pagespeed-ngx - Git at Google

 #!/bin/bash
 #
 # Copyright 2011 Google Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #      http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS,
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
 # Install Page Speed, using the Apache apxs tool to determine the
 # installation locations.
 #
 # You can specify the path to apxs to install to a non-system-default
 # Apache.
 #
 #  APXS_BIN=/path/to/apxs ./install_apxs.sh
 #
 # To install to a location that does not require superuser access:
 #
 #  NO_SUDO=1 ./install_apxs.sh

 SRC_ROOT="$(dirname $0)/.."
 BUILD_ROOT="${SRC_ROOT}/out/Release"
 MODPAGESPEED_SO_PATH="${BUILD_ROOT}/libmod_pagespeed.so"
 MODPAGESPEED_SO24_PATH="${BUILD_ROOT}/libmod_pagespeed_ap24.so"
 PAGESPEED_JS_MINIFY_PATH="${BUILD_ROOT}/js_minify"

 BINDIR=${BINDIR:-"/usr/local/bin"}
 MOD_PAGESPEED_CACHE=${MOD_PAGESPEED_CACHE:-"/var/cache/mod_pagespeed"}
 MOD_PAGESPEED_LOG=${MOD_PAGESPEED_LOG:-"/var/log/pagespeed"}
 APACHE_CONF_FILENAME=${APACHE_CONF_FILENAME:-"httpd.conf"}
 MODPAGESPEED_SO_NAME=${MODPAGESPEED_SO_NAME:-"mod_pagespeed.so"}
 MODPAGESPEED_SO24_NAME=${MODPAGESPEED_SO24_NAME:-"mod_pagespeed_ap24.so"}
 MODPAGESPEED_CONF_NAME=${MODPAGESPEED_CONF_NAME:-"pagespeed.conf"}
 LIBRARIES_CONF_NAME=${LIBRARIES_CONF_NAME:-"pagespeed_libraries.conf"}
 PAGESPEED_JS_MINIFY_NAME=${PAGESPEED_JS_MINIFY_NAME:-"pagespeed_js_minify"}

 MODPAGESPEED_FILE_USER=${MODPAGESPEED_FILE_USER:-"root"}
 MODPAGESPEED_FILE_GROUP=${MODPAGESPEED_FILE_GROUP:-${MODPAGESPEED_FILE_USER}}
 SUDO_CMD=${SUDO_CMD:-"sudo"}

 # If NO_SUDO was specified, then we should use a user and group that
 # matches the current user and group when installing files.
 if [ ! -z "${NO_SUDO}" ]; then
   MODPAGESPEED_FILE_USER=$USER
   MODPAGESPEED_FILE_GROUP=$(groups | cut -d\  -f1)
   SUDO_CMD=""
 fi

 # Load the script used to perform template substitutions on our config
 # files.
 source ${SRC_ROOT}/install/common/installer.include

 # Args: variable name
 #
 # Takes a variable name, and makes sure that it is set.
 function is_set() {
   local DOLLAR='$';
   local TO_EVAL="${DOLLAR}$1"
   local VALUE=$(eval "echo $TO_EVAL")
   local RET=1
   if [ ! -z "${VALUE}" ]; then
     RET=0
   fi
   return $RET
 }

 # Args: variable name, expression, debug string
 #
 # Exits if the specified variable name does not have an assigned value
 # or if the expression evaluates to false.
 function check() {
   if ! is_set "$1" || ! eval "$2"; then
     echo "Unable to determine $3."
     echo "Please set the $1 environment variable when invoking $0."
     exit 1
   fi
 }

 # Args: user, group, misc, src, dst
 #
 # Some hackery to get around the fact that 'install' refuses to take
 # owner/group arguments unless run as root.
 function do_install() {
   local INST_USER_GROUP=""
   if [ -z "${NO_SUDO}" ]; then
     INST_USER_GROUP="-o $1 -g $2"
   fi
   eval "${SUDO_CMD} install $INST_USER_GROUP $3 $4 $5"
 }

 # Args: setting name
 #
 # Extract an Apache compile-time setting with the given name.
 function extract_compile_setting() {
   EXTRACT_COMPILE_SETTING=
   APACHE_CONF_LINE=$(${APACHE_BIN} -V | grep $1)
   if [ ! -z "${APACHE_CONF_LINE}" ]; then
     local SED_REGEX="s/^.*${1}=?[\"\'\ ]*//"
     EXTRACTED_COMPILE_SETTING=$(echo "${APACHE_CONF_LINE}" |
         sed -r "${SED_REGEX}" |
         sed "s/[\"\'\ ]*$//")
   fi
 }

 if [ ! -f "${MODPAGESPEED_SO_PATH}" ]; then
   echo "${MODPAGESPEED_SO_PATH} doesn't exist. Need to build first."
   exit 1
 fi

 # Find the apxs binary, if not specified.
 if [ -z "${APXS_BIN}" ]; then
   APXS_BIN=$(which apxs 2> /dev/null)
   if [ -z "${APXS_BIN}" ]; then
     APXS_BIN=$(which apxs2 2> /dev/null)
   fi
   if [ -z "${APXS_BIN}" ]; then
     # Default location when Apache is installed from source.
     APXS_BIN="/usr/local/apache2/bin/apxs"
   fi
 fi

 # Find apxs which tells us about the system.
 check APXS_BIN "[ -f ${APXS_BIN} -a -x ${APXS_BIN} ]" "path to Apache apxs"

 echo "Using ${APXS_BIN} to determine installation location."
 echo ""

 # This is an optional configuration variable. If set, the conf file
 # path is relative to it.
 APACHE_ROOT=$(${APXS_BIN} -q PREFIX)

 # Find the Apache shared module dir.
 APACHE_MODULEDIR=$(${APXS_BIN} -q LIBEXECDIR)
 check APACHE_MODULEDIR "[ -d ${APACHE_MODULEDIR} ]" "Apache module dir"

 # Find the Apache conf dir.
 APACHE_CONFDIR=$(${APXS_BIN} -q SYSCONFDIR)
 check APACHE_CONFDIR "[ -d ${APACHE_CONFDIR} ]" "Apache conf dir"

 APACHE_SBINDIR=$(${APXS_BIN} -q SBINDIR)
 check APACHE_SBINDIR "[ -d ${APACHE_SBINDIR} ]" "Apache bin dir"

 APACHE_TARGET=$(${APXS_BIN} -q TARGET)
 APACHE_BIN="${APACHE_SBINDIR}/${APACHE_TARGET}"
 check APACHE_BIN "[ -f ${APACHE_BIN} -a -x ${APACHE_BIN} ]" "Apache binary"

 # Find the Apache conf file.
 if [ -z "${APACHE_CONF_FILE}" ]; then
   extract_compile_setting SERVER_CONFIG_FILE
   APACHE_CONF_FILE="${EXTRACTED_COMPILE_SETTING}"
 fi
 if [ ! -z "${APACHE_ROOT}" ]; then
   APACHE_CONF_FILE="${APACHE_ROOT}/${APACHE_CONF_FILE}"
 fi
 if [ -z "${APACHE_CONF_FILE}" ]; then
   APACHE_CONF_FILE="${APACHE_CONFDIR}/${APACHE_CONF_FILENAME}"
 fi
 check APACHE_CONF_FILE "[ -f ${APACHE_CONF_FILE} ]" "Apache configuration file"

 # Try to grep for the Apache user.
 if [ -z "${APACHE_USER}" ]; then
   APACHE_USER_LINE=$(egrep -i "^[[:blank:]]*User[[:blank:]]+" "${APACHE_CONF_FILE}")
   if [ ! -z "${APACHE_USER_LINE}" ]; then
     APACHE_USER=$(echo "${APACHE_USER_LINE}" |
         sed -r s/^.*User[[:blank:]]+[\"\']*// |
         sed s/[\"\'[:blank:]]*$//)
   fi
 fi

 # Try to grep for the Apache group.
 if [ -z "${APACHE_GROUP}" ]; then
   APACHE_GROUP_LINE=$(egrep -i "^[[:blank:]]*Group[[:blank:]]+" "${APACHE_CONF_FILE}")
   if [ ! -z "${APACHE_GROUP_LINE}" ]; then
     APACHE_GROUP=$(echo "${APACHE_GROUP_LINE}" |
         sed -r s/^.*Group[[:blank:]]+[\"\']*// |
         sed s/[\"\'[:blank:]]*$//)
   fi
 fi

 # Make sure we have an Apache user and group.
 check APACHE_USER "[ ! -z \'${APACHE_USER}\' ]" "Apache user"
 check APACHE_GROUP "[ ! -z \'${APACHE_GROUP}\' ]" "Apache group"

 # Make sure the user is valid.
 check APACHE_USER "id '${APACHE_USER}' &> /dev/null" "valid Apache user '${APACHE_USER}'"

 # Make sure the group is valid.
 # TODO(bmcquade): is there a way to ask the system if a group exists, similar
 # to the 'id' command?
 check APACHE_GROUP "egrep -q '^${APACHE_GROUP}:' /etc/group" "valid Apache group '${APACHE_GROUP}'"

 MODPAGESPEED_CONFDIR=${MODPAGESPEED_CONFDIR:-${APACHE_CONFDIR}}

 echo "mod_pagespeed needs to cache optimized resources on the file system."
 echo "The default location for this cache is '${MOD_PAGESPEED_CACHE}'."
 read -p "Would you like to specify a different location? (y/N) " -n1 PROMPT
 if [ "${PROMPT}" = "y" -o "${PROMPT}" = "Y" ]; then
   echo ""
   read -p "Location for mod_pagespeed file cache: " MOD_PAGESPEED_CACHE
 fi

 if [ -z "${MOD_PAGESPEED_CACHE}" ]; then
   echo ""
   echo "Must specify a mod_pagespeed file cache."
   exit 1
 fi

 echo ""
 echo "Preparing to install to the following locations:"
 echo "${APACHE_MODULEDIR}/${MODPAGESPEED_SO_NAME} (${MODPAGESPEED_FILE_USER}:${MODPAGESPEED_FILE_GROUP})"
 echo "${APACHE_MODULEDIR}/${MODPAGESPEED_SO24_NAME} (${MODPAGESPEED_FILE_USER}:${MODPAGESPEED_FILE_GROUP})"
 echo "${BINDIR}/${PAGESPEED_JS_MINIFY_NAME} (${MODPAGESPEED_FILE_USER}:${MODPAGESPEED_FILE_GROUP})"
 echo "${MODPAGESPEED_CONFDIR}/${MODPAGESPEED_CONF_NAME} (${MODPAGESPEED_FILE_USER}:${MODPAGESPEED_FILE_GROUP})"
 echo "${MODPAGESPEED_CONFDIR}/${LIBRARIES_CONF_NAME} (${MODPAGESPEED_FILE_USER}:${MODPAGESPEED_FILE_GROUP})"
 echo "${MOD_PAGESPEED_CACHE} (${APACHE_USER}:${APACHE_GROUP})"
 echo ""
 if [ -z "${NO_PROMPT}" ]; then
   echo -n "Continue? (y/N) "
   read -n1 PROMPT
   echo ""
   if [ "${PROMPT}" != "y" -a "${PROMPT}" != "Y" ]; then
     echo "Not continuing."
     exit 1
   fi
 fi

 if [ -d "${MOD_PAGESPEED_CACHE}" ]; then
   echo "${MOD_PAGESPEED_CACHE} already exists. Not creating."
 fi

 # Only attempt to load mod_deflate in our conf file if it's actually
 # present on the system.
 COMMENT_OUT_DEFLATE='\#'
 if [ -f "${APACHE_MODULEDIR}/mod_deflate.so" ]; then
   COMMENT_OUT_DEFLATE=
 else
   echo "Unable to find mod_deflate.so. HTTP compression support not enabled!"
 fi

 TMP_CONF=$(mktemp -t conf.tmp.XXXXXX) || exit 1
 process_template "${SRC_ROOT}/install/common/pagespeed.conf.template" "${TMP_CONF}"
 TMP_LOAD=$(mktemp -t load.tmp.XXXXXX) || exit 1
 process_template "${SRC_ROOT}/install/common/pagespeed.load.template" "${TMP_LOAD}"
 cat "${TMP_CONF}" >> "${TMP_LOAD}"

 INSTALLATION_SUCCEEDED=0
 if (
 do_install "${MODPAGESPEED_FILE_USER}" "${MODPAGESPEED_FILE_GROUP}" \
   "-m 644 -s" \
   "${MODPAGESPEED_SO_PATH}" \
   "${APACHE_MODULEDIR}/${MODPAGESPEED_SO_NAME}" &&
 do_install "${MODPAGESPEED_FILE_USER}" "${MODPAGESPEED_FILE_GROUP}" \
   "-m 644 -s" \
   "${MODPAGESPEED_SO24_PATH}" \
   "${APACHE_MODULEDIR}/${MODPAGESPEED_SO24_NAME}" &&
 do_install "${MODPAGESPEED_FILE_USER}" "${MODPAGESPEED_FILE_GROUP}" \
   "-m 755 -s" \
   "${PAGESPEED_JS_MINIFY_PATH}" \
   "${BINDIR}/${PAGESPEED_JS_MINIFY_NAME}" &&
 do_install "${MODPAGESPEED_FILE_USER}" "${MODPAGESPEED_FILE_GROUP}" "-m 644" \
   "${TMP_LOAD}" \
   "${MODPAGESPEED_CONFDIR}/${MODPAGESPEED_CONF_NAME}" &&
 do_install "${MODPAGESPEED_FILE_USER}" "${MODPAGESPEED_FILE_GROUP}" "-m 644" \
   "${SRC_ROOT}/net/instaweb/genfiles/conf/pagespeed_libraries.conf" \
   "${MODPAGESPEED_CONFDIR}/${LIBRARIES_CONF_NAME}" &&
 do_install "${APACHE_USER}" "${APACHE_GROUP}" "-m 755 -d" \
   "${MOD_PAGESPEED_CACHE}" &&
 do_install "${APACHE_USER}" "${APACHE_GROUP}" "-m 755 -d" "${MOD_PAGESPEED_LOG}"
 ); then
   MODPAGESPEED_LOAD_LINE="Include ${MODPAGESPEED_CONFDIR}/${MODPAGESPEED_CONF_NAME}"
   if ! grep -q "${MODPAGESPEED_LOAD_LINE}" "${APACHE_CONF_FILE}"; then
     echo "Adding a load line for mod_pagespeed to ${APACHE_CONF_FILE}."
     ${SUDO_CMD} sh -c "echo ${MODPAGESPEED_LOAD_LINE} >> ${APACHE_CONF_FILE}"
   fi
   LIBRARIES_LOAD_LINE="Include ${MODPAGESPEED_CONFDIR}/${LIBRARIES_CONF_NAME}"
   if ! grep -q "${LIBRARIES_LOAD_LINE}" "${APACHE_CONF_FILE}"; then
     echo "Adding a load line for pagespeed_libraries to ${APACHE_CONF_FILE}."
     ${SUDO_CMD} sh -c "echo ${LIBRARIES_LOAD_LINE} >> ${APACHE_CONF_FILE}"
   fi
   if grep -q "${MODPAGESPEED_LOAD_LINE}" "${APACHE_CONF_FILE}" && \
      grep -q "${LIBRARIES_LOAD_LINE}" "${APACHE_CONF_FILE}"; then
     INSTALLATION_SUCCEEDED=1
   fi
 fi

 echo ""
 if [ $INSTALLATION_SUCCEEDED -eq 1 ]; then
   echo "Installation succeeded."
   echo "Restart apache to enable mod_pagespeed."
 else
   echo "Installation failed."
 fi

 rm -f "${TMP_CONF}" "${TMP_LOAD}"
	#!/bin/bash
	#
	# Copyright 2011 Google Inc.
	#
	# Licensed under the Apache License, Version 2.0 (the "License");
	# you may not use this file except in compliance with the License.
	# You may obtain a copy of the License at
	#
	# http://www.apache.org/licenses/LICENSE-2.0
	#
	# Unless required by applicable law or agreed to in writing, software
	# distributed under the License is distributed on an "AS IS" BASIS,
	# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	# See the License for the specific language governing permissions and
	# limitations under the License.
	#
	# Install Page Speed, using the Apache apxs tool to determine the
	# installation locations.
	#
	# You can specify the path to apxs to install to a non-system-default
	# Apache.
	#
	# APXS_BIN=/path/to/apxs ./install_apxs.sh
	#
	# To install to a location that does not require superuser access:
	#
	# NO_SUDO=1 ./install_apxs.sh

	SRC_ROOT="$(dirname $0)/.."
	BUILD_ROOT="${SRC_ROOT}/out/Release"
	MODPAGESPEED_SO_PATH="${BUILD_ROOT}/libmod_pagespeed.so"
	MODPAGESPEED_SO24_PATH="${BUILD_ROOT}/libmod_pagespeed_ap24.so"
	PAGESPEED_JS_MINIFY_PATH="${BUILD_ROOT}/js_minify"

	BINDIR=${BINDIR:-"/usr/local/bin"}
	MOD_PAGESPEED_CACHE=${MOD_PAGESPEED_CACHE:-"/var/cache/mod_pagespeed"}
	MOD_PAGESPEED_LOG=${MOD_PAGESPEED_LOG:-"/var/log/pagespeed"}
	APACHE_CONF_FILENAME=${APACHE_CONF_FILENAME:-"httpd.conf"}
	MODPAGESPEED_SO_NAME=${MODPAGESPEED_SO_NAME:-"mod_pagespeed.so"}
	MODPAGESPEED_SO24_NAME=${MODPAGESPEED_SO24_NAME:-"mod_pagespeed_ap24.so"}
	MODPAGESPEED_CONF_NAME=${MODPAGESPEED_CONF_NAME:-"pagespeed.conf"}
	LIBRARIES_CONF_NAME=${LIBRARIES_CONF_NAME:-"pagespeed_libraries.conf"}
	PAGESPEED_JS_MINIFY_NAME=${PAGESPEED_JS_MINIFY_NAME:-"pagespeed_js_minify"}

	MODPAGESPEED_FILE_USER=${MODPAGESPEED_FILE_USER:-"root"}
	MODPAGESPEED_FILE_GROUP=${MODPAGESPEED_FILE_GROUP:-${MODPAGESPEED_FILE_USER}}
	SUDO_CMD=${SUDO_CMD:-"sudo"}

	# If NO_SUDO was specified, then we should use a user and group that
	# matches the current user and group when installing files.
	if [ ! -z "${NO_SUDO}" ]; then
	MODPAGESPEED_FILE_USER=$USER
	MODPAGESPEED_FILE_GROUP=$(groups \| cut -d\ -f1)
	SUDO_CMD=""
	fi

	# Load the script used to perform template substitutions on our config
	# files.
	source ${SRC_ROOT}/install/common/installer.include

	# Args: variable name
	#
	# Takes a variable name, and makes sure that it is set.
	function is_set() {
	local DOLLAR='$';
	local TO_EVAL="${DOLLAR}$1"
	local VALUE=$(eval "echo $TO_EVAL")
	local RET=1
	if [ ! -z "${VALUE}" ]; then
	RET=0
	fi
	return $RET
	}

	# Args: variable name, expression, debug string
	#
	# Exits if the specified variable name does not have an assigned value
	# or if the expression evaluates to false.
	function check() {
	if ! is_set "$1" \|\| ! eval "$2"; then
	echo "Unable to determine $3."
	echo "Please set the $1 environment variable when invoking $0."
	exit 1
	fi
	}

	# Args: user, group, misc, src, dst
	#
	# Some hackery to get around the fact that 'install' refuses to take
	# owner/group arguments unless run as root.
	function do_install() {
	local INST_USER_GROUP=""
	if [ -z "${NO_SUDO}" ]; then
	INST_USER_GROUP="-o $1 -g $2"
	fi
	eval "${SUDO_CMD} install $INST_USER_GROUP $3 $4 $5"
	}

	# Args: setting name
	#
	# Extract an Apache compile-time setting with the given name.
	function extract_compile_setting() {
	EXTRACT_COMPILE_SETTING=
	APACHE_CONF_LINE=$(${APACHE_BIN} -V \| grep $1)
	if [ ! -z "${APACHE_CONF_LINE}" ]; then
	local SED_REGEX="s/^.${1}=?[\"\'\ ]//"
	EXTRACTED_COMPILE_SETTING=$(echo "${APACHE_CONF_LINE}" \|
	sed -r "${SED_REGEX}" \|
	sed "s/[\"\'\ ]*$//")
	fi
	}

	if [ ! -f "${MODPAGESPEED_SO_PATH}" ]; then
	echo "${MODPAGESPEED_SO_PATH} doesn't exist. Need to build first."
	exit 1
	fi

	# Find the apxs binary, if not specified.
	if [ -z "${APXS_BIN}" ]; then
	APXS_BIN=$(which apxs 2> /dev/null)
	if [ -z "${APXS_BIN}" ]; then
	APXS_BIN=$(which apxs2 2> /dev/null)
	fi
	if [ -z "${APXS_BIN}" ]; then
	# Default location when Apache is installed from source.
	APXS_BIN="/usr/local/apache2/bin/apxs"
	fi
	fi

	# Find apxs which tells us about the system.
	check APXS_BIN "[ -f ${APXS_BIN} -a -x ${APXS_BIN} ]" "path to Apache apxs"

	echo "Using ${APXS_BIN} to determine installation location."
	echo ""

	# This is an optional configuration variable. If set, the conf file
	# path is relative to it.
	APACHE_ROOT=$(${APXS_BIN} -q PREFIX)

	# Find the Apache shared module dir.
	APACHE_MODULEDIR=$(${APXS_BIN} -q LIBEXECDIR)
	check APACHE_MODULEDIR "[ -d ${APACHE_MODULEDIR} ]" "Apache module dir"

	# Find the Apache conf dir.
	APACHE_CONFDIR=$(${APXS_BIN} -q SYSCONFDIR)
	check APACHE_CONFDIR "[ -d ${APACHE_CONFDIR} ]" "Apache conf dir"

	APACHE_SBINDIR=$(${APXS_BIN} -q SBINDIR)
	check APACHE_SBINDIR "[ -d ${APACHE_SBINDIR} ]" "Apache bin dir"

	APACHE_TARGET=$(${APXS_BIN} -q TARGET)
	APACHE_BIN="${APACHE_SBINDIR}/${APACHE_TARGET}"
	check APACHE_BIN "[ -f ${APACHE_BIN} -a -x ${APACHE_BIN} ]" "Apache binary"

	# Find the Apache conf file.
	if [ -z "${APACHE_CONF_FILE}" ]; then
	extract_compile_setting SERVER_CONFIG_FILE
	APACHE_CONF_FILE="${EXTRACTED_COMPILE_SETTING}"
	fi
	if [ ! -z "${APACHE_ROOT}" ]; then
	APACHE_CONF_FILE="${APACHE_ROOT}/${APACHE_CONF_FILE}"
	fi
	if [ -z "${APACHE_CONF_FILE}" ]; then
	APACHE_CONF_FILE="${APACHE_CONFDIR}/${APACHE_CONF_FILENAME}"
	fi
	check APACHE_CONF_FILE "[ -f ${APACHE_CONF_FILE} ]" "Apache configuration file"

	# Try to grep for the Apache user.
	if [ -z "${APACHE_USER}" ]; then
	APACHE_USER_LINE=$(egrep -i "^[[:blank:]]*User[[:blank:]]+" "${APACHE_CONF_FILE}")
	if [ ! -z "${APACHE_USER_LINE}" ]; then
	APACHE_USER=$(echo "${APACHE_USER_LINE}" \|
	sed -r s/^.User[[:blank:]]+[\"\']// \|
	sed s/[\"\'[:blank:]]*$//)
	fi
	fi

	# Try to grep for the Apache group.
	if [ -z "${APACHE_GROUP}" ]; then
	APACHE_GROUP_LINE=$(egrep -i "^[[:blank:]]*Group[[:blank:]]+" "${APACHE_CONF_FILE}")
	if [ ! -z "${APACHE_GROUP_LINE}" ]; then
	APACHE_GROUP=$(echo "${APACHE_GROUP_LINE}" \|
	sed -r s/^.Group[[:blank:]]+[\"\']// \|
	sed s/[\"\'[:blank:]]*$//)
	fi
	fi

	# Make sure we have an Apache user and group.
	check APACHE_USER "[ ! -z \'${APACHE_USER}\' ]" "Apache user"
	check APACHE_GROUP "[ ! -z \'${APACHE_GROUP}\' ]" "Apache group"

	# Make sure the user is valid.
	check APACHE_USER "id '${APACHE_USER}' &> /dev/null" "valid Apache user '${APACHE_USER}'"

	# Make sure the group is valid.
	# TODO(bmcquade): is there a way to ask the system if a group exists, similar
	# to the 'id' command?
	check APACHE_GROUP "egrep -q '^${APACHE_GROUP}:' /etc/group" "valid Apache group '${APACHE_GROUP}'"

	MODPAGESPEED_CONFDIR=${MODPAGESPEED_CONFDIR:-${APACHE_CONFDIR}}

	echo "mod_pagespeed needs to cache optimized resources on the file system."
	echo "The default location for this cache is '${MOD_PAGESPEED_CACHE}'."
	read -p "Would you like to specify a different location? (y/N) " -n1 PROMPT
	if [ "${PROMPT}" = "y" -o "${PROMPT}" = "Y" ]; then
	echo ""
	read -p "Location for mod_pagespeed file cache: " MOD_PAGESPEED_CACHE
	fi

	if [ -z "${MOD_PAGESPEED_CACHE}" ]; then
	echo ""
	echo "Must specify a mod_pagespeed file cache."
	exit 1
	fi

	echo ""
	echo "Preparing to install to the following locations:"
	echo "${APACHE_MODULEDIR}/${MODPAGESPEED_SO_NAME} (${MODPAGESPEED_FILE_USER}:${MODPAGESPEED_FILE_GROUP})"
	echo "${APACHE_MODULEDIR}/${MODPAGESPEED_SO24_NAME} (${MODPAGESPEED_FILE_USER}:${MODPAGESPEED_FILE_GROUP})"
	echo "${BINDIR}/${PAGESPEED_JS_MINIFY_NAME} (${MODPAGESPEED_FILE_USER}:${MODPAGESPEED_FILE_GROUP})"
	echo "${MODPAGESPEED_CONFDIR}/${MODPAGESPEED_CONF_NAME} (${MODPAGESPEED_FILE_USER}:${MODPAGESPEED_FILE_GROUP})"
	echo "${MODPAGESPEED_CONFDIR}/${LIBRARIES_CONF_NAME} (${MODPAGESPEED_FILE_USER}:${MODPAGESPEED_FILE_GROUP})"
	echo "${MOD_PAGESPEED_CACHE} (${APACHE_USER}:${APACHE_GROUP})"
	echo ""
	if [ -z "${NO_PROMPT}" ]; then
	echo -n "Continue? (y/N) "
	read -n1 PROMPT
	echo ""
	if [ "${PROMPT}" != "y" -a "${PROMPT}" != "Y" ]; then
	echo "Not continuing."
	exit 1
	fi
	fi

	if [ -d "${MOD_PAGESPEED_CACHE}" ]; then
	echo "${MOD_PAGESPEED_CACHE} already exists. Not creating."
	fi

	# Only attempt to load mod_deflate in our conf file if it's actually
	# present on the system.
	COMMENT_OUT_DEFLATE='\#'
	if [ -f "${APACHE_MODULEDIR}/mod_deflate.so" ]; then
	COMMENT_OUT_DEFLATE=
	else
	echo "Unable to find mod_deflate.so. HTTP compression support not enabled!"
	fi

	TMP_CONF=$(mktemp -t conf.tmp.XXXXXX) \|\| exit 1
	process_template "${SRC_ROOT}/install/common/pagespeed.conf.template" "${TMP_CONF}"
	TMP_LOAD=$(mktemp -t load.tmp.XXXXXX) \|\| exit 1
	process_template "${SRC_ROOT}/install/common/pagespeed.load.template" "${TMP_LOAD}"
	cat "${TMP_CONF}" >> "${TMP_LOAD}"

	INSTALLATION_SUCCEEDED=0
	if (
	do_install "${MODPAGESPEED_FILE_USER}" "${MODPAGESPEED_FILE_GROUP}" \
	"-m 644 -s" \
	"${MODPAGESPEED_SO_PATH}" \
	"${APACHE_MODULEDIR}/${MODPAGESPEED_SO_NAME}" &&
	do_install "${MODPAGESPEED_FILE_USER}" "${MODPAGESPEED_FILE_GROUP}" \
	"-m 644 -s" \
	"${MODPAGESPEED_SO24_PATH}" \
	"${APACHE_MODULEDIR}/${MODPAGESPEED_SO24_NAME}" &&
	do_install "${MODPAGESPEED_FILE_USER}" "${MODPAGESPEED_FILE_GROUP}" \
	"-m 755 -s" \
	"${PAGESPEED_JS_MINIFY_PATH}" \
	"${BINDIR}/${PAGESPEED_JS_MINIFY_NAME}" &&
	do_install "${MODPAGESPEED_FILE_USER}" "${MODPAGESPEED_FILE_GROUP}" "-m 644" \
	"${TMP_LOAD}" \
	"${MODPAGESPEED_CONFDIR}/${MODPAGESPEED_CONF_NAME}" &&
	do_install "${MODPAGESPEED_FILE_USER}" "${MODPAGESPEED_FILE_GROUP}" "-m 644" \
	"${SRC_ROOT}/net/instaweb/genfiles/conf/pagespeed_libraries.conf" \
	"${MODPAGESPEED_CONFDIR}/${LIBRARIES_CONF_NAME}" &&
	do_install "${APACHE_USER}" "${APACHE_GROUP}" "-m 755 -d" \
	"${MOD_PAGESPEED_CACHE}" &&
	do_install "${APACHE_USER}" "${APACHE_GROUP}" "-m 755 -d" "${MOD_PAGESPEED_LOG}"
	); then
	MODPAGESPEED_LOAD_LINE="Include ${MODPAGESPEED_CONFDIR}/${MODPAGESPEED_CONF_NAME}"
	if ! grep -q "${MODPAGESPEED_LOAD_LINE}" "${APACHE_CONF_FILE}"; then
	echo "Adding a load line for mod_pagespeed to ${APACHE_CONF_FILE}."
	${SUDO_CMD} sh -c "echo ${MODPAGESPEED_LOAD_LINE} >> ${APACHE_CONF_FILE}"
	fi
	LIBRARIES_LOAD_LINE="Include ${MODPAGESPEED_CONFDIR}/${LIBRARIES_CONF_NAME}"
	if ! grep -q "${LIBRARIES_LOAD_LINE}" "${APACHE_CONF_FILE}"; then
	echo "Adding a load line for pagespeed_libraries to ${APACHE_CONF_FILE}."
	${SUDO_CMD} sh -c "echo ${LIBRARIES_LOAD_LINE} >> ${APACHE_CONF_FILE}"
	fi
	if grep -q "${MODPAGESPEED_LOAD_LINE}" "${APACHE_CONF_FILE}" && \
	grep -q "${LIBRARIES_LOAD_LINE}" "${APACHE_CONF_FILE}"; then
	INSTALLATION_SUCCEEDED=1
	fi
	fi

	echo ""
	if [ $INSTALLATION_SUCCEEDED -eq 1 ]; then
	echo "Installation succeeded."
	echo "Restart apache to enable mod_pagespeed."
	else
	echo "Installation failed."
	fi

	rm -f "${TMP_CONF}" "${TMP_LOAD}"