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✏️ Editing: apache_detector.rb

#  Phusion Passenger - https://www.phusionpassenger.com/
#  Copyright (c) 2013-2025 Asynchronous B.V.
#
#  "Passenger", "Phusion Passenger" and "Union Station" are registered
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#
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PhusionPassenger.require_passenger_lib 'constants'
PhusionPassenger.require_passenger_lib 'platform_info'
PhusionPassenger.require_passenger_lib 'platform_info/ruby'
PhusionPassenger.require_passenger_lib 'platform_info/apache'
PhusionPassenger.require_passenger_lib 'utils/ansi_colors'
require 'pathname'

module PhusionPassenger
  module PlatformInfo

# Detects all possible Apache installations on the system, and presents the
    # autodetection information to the user in a friendly way. It turns out too
    # many people have multiple Apache installations on their system, but they
    # don't know about that, or they don't know how to compile against the
    # correct Apache installation. This tool helps them.
    #
    # If you use this class to log things to the terminal, then be sure to set
    # the terminal color to Utils::AnsiColors::DEFAULT_TERMINAL_COLOR.
    class ApacheDetector
      class Result
        # These are required and are never nil.
        attr_accessor :apxs2, :httpd, :ctl, :version
        # These are optional and may be nil.
        attr_accessor :a2enmod, :a2dismod
        # Ttis may be nil. It depends on whether 'apache2ctl -V' succeeds.
        attr_accessor :config_file
        # This may be nil. It depends on how well we can infer information from the config file.
        attr_accessor :error_log
        attr_writer :config_file_broken

def initialize(detector)
          @detector = detector
        end

def config_file_broken?
          @config_file_broken
        end

def report
 log " * Found Apache #{version}!"
 log " Information:"
 log " apxs2 : #{apxs2 || 'N/A'}"
 log " Main executable: #{httpd}"
 log " Control command: #{ctl}"
 log " Config file : #{config_file || 'unknown'}"
 log " Error log file : #{error_log || 'unknown'}"
 if config_file_broken?
 log ""
 log " WARNING:"
 log " <red>The configuration file seems to be broken! Please double-check it by running:</red>"
 log " <red>#{ctl} -t</red>"
 end
 log ""
 log " To install #{PROGRAM_NAME} against this specific Apache version:"
 log " #{PlatformInfo.ruby_command} #{PhusionPassenger.bin_dir}/passenger-install-apache2-module --apxs2-path='#{apxs2 || 'none'}'"
 log ""
 log " To start, stop or restart this specific Apache version:"
 log " #{ctl} start"
 log " #{ctl} stop"
 log " #{ctl} restart"
 log ""
 if error_log
 log " To troubleshoot, please read the logs in this file:"
 log " #{error_log}"
 log ""
 end
 end

private
        def log(message)
          @detector.send(:log, message)
        end
      end

attr_reader :results

def initialize(output)
 @output = output
 @results = []
 @failures = 0
 PlatformInfo.verbose = true
 PlatformInfo.log_implementation = lambda do |message|
 if message =~ /: found$/
 log("<green> --> #{message}</green>")
 else
 log(" --> #{message}")
 end
 end
 end

def finish
        PlatformInfo.verbose = false
        PlatformInfo.log_implementation = nil
      end

def detect_all
 log "<banner>Looking for possible Apache installations...</banner>"
 apxses = PlatformInfo.find_all_commands("apxs2") +
 PlatformInfo.find_all_commands("apxs")
 if PlatformInfo.apxs2 && !apxses.include?(PlatformInfo.apxs2)
 PlatformInfo.send(:log, "Looking for #{PlatformInfo.apxs2}: found")
 apxses << PlatformInfo.apxs2
 end
 apxses = remove_symlink_duplications(apxses)
 log ""
 apxses.each do |apxs2|
 detect_one(apxs2)
 end
 # macOS >= 10.13 High Sierra no longer ships apxs2, but we'll want to perform
 # an autodetection run against the OS-provided Apache installation anyway.
 if PlatformInfo.os_name_simple == 'macosx' && PlatformInfo.os_version >= '10.13'
 detect_one(nil)
 end
 end

def detect_one(apxs2)
 # Note: apxs2 is nil on macOS 10.13 High Sierra. See comment in #detect_all.
 apxs2_description = apxs2 || 'OS-default Apache installation'
 log "<banner>Analyzing #{apxs2_description}...</banner>"
 add_result do |result|
 result.apxs2 = apxs2
 log "Detecting main Apache executable..."
 result.httpd = PlatformInfo.httpd(:apxs2 => apxs2)
 if result.httpd
 log "Detecting version..."
 if result.version = PlatformInfo.httpd_version(:httpd => result.httpd)
 log " --> #{result.version}"
 else
 log "<red> --> Cannot detect version!</red>"
 result.httpd = nil
 end
 end
 if result.httpd
 log "Detecting control command..."
 result.ctl = PlatformInfo.apache2ctl(:apxs2 => apxs2)
 result.httpd = nil if !result.ctl
 end
 if result.httpd
 log "Detecting configuration file location..."
 result.config_file = PlatformInfo.httpd_default_config_file(
 :httpd => result.httpd,
 :apache2ctl => result.ctl)
 if result.config_file
 log " --> #{result.config_file}"
 else
 log "<red> --> Cannot detect default config file location!</red>"
 end
 end
 if result.httpd
 log "Detecting error log file..."
 result.error_log = PlatformInfo.httpd_actual_error_log(
 :httpd => result.httpd,
 :apache2ctl => result.ctl)
 if result.error_log
 log " --> #{result.error_log}"
 else
 log "<red> --> Cannot detect error log file!</red>"
 end
 end
 if result.httpd
 log "Detecting a2enmod and a2dismod..."
 result.a2enmod = PlatformInfo.a2enmod(:apxs2 => apxs2)
 result.a2dismod = PlatformInfo.a2dismod(:apxs2 => apxs2)
 end
 if result.httpd
 result.config_file_broken = PlatformInfo.apache2ctl_V(:apxs2 => apxs2,
 :apache2ctl => result.ctl).nil?
 end
 if result.httpd
 log "<green>Found a usable Apache installation using #{apxs2_description}.</green>"
 true
 else
 log "<yellow>Cannot find a usable Apache installation using #{apxs2_description}.</yellow>"
 false
 end
 end
 log ""
 end

def report
 if @failures > 0 && Process.uid != 0
 user = `whoami`.strip
 sudo_s_e = PhusionPassenger::PlatformInfo.ruby_sudo_shell_command("-E")
 ruby = PhusionPassenger::PlatformInfo.ruby_command
 log ""
 log "----------------------------"
 log ""
 log "<red>Permission problems</red>"
 log ""
 log "Sorry, this program doesn't have enough permissions to autodetect all your"
 log "Apache installations, because it's running as the #{`whoami`.strip} user."
 log "Please re-run this program with root privileges:"
 log ""
 log " export ORIG_PATH=\"$PATH\""
 log " #{sudo_s_e}"
 log " export PATH=\"$ORIG_PATH\""
 log " #{ruby} #{PhusionPassenger.bin_dir}/passenger-config --detect-apache2"
 return
 end

log "<banner>Final autodetection results</banner>"
 @results.each do |result|
 result.report
 end

if @results.empty?
          PhusionPassenger.require_passenger_lib 'platform_info/depcheck'
          PlatformInfo::Depcheck.load("depcheck_specs/apache2")
          apache2 = PlatformInfo::Depcheck.find("apache2")
          apache2_install_instructions = apache2.install_instructions.split("\n").join("\n   ")
          # apxs2 is part of the development headers.
          apache2_dev = PlatformInfo::Depcheck.find("apache2-dev")
          apache2_dev_install_instructions = apache2_dev.install_instructions.split("\n").join("\n   ")

log "<red>Sorry, this program cannot find an Apache installation.</red>"
 log ""
 log "Please install Apache and its development headers."
 log ""
 log " <yellow>* To install Apache:</yellow>"
 log " #{apache2_install_instructions}"
 log ""
 log " <yellow>* To install Apache development headers:</yellow>"
 log " #{apache2_dev_install_instructions}"
 log ""
 log "If you are sure that you have Apache installed, please read the documentation:"
 log "https://www.phusionpassenger.com/library/install/apache/customizing_compilation_process.html#forcing-location-of-command-line-tools-and-dependencies"
 elsif @results.size > 1
 log "<yellow>WARNING: You have multiple Apache installations on your system!</yellow>"
 log "You are strongly recommended to read this section of the documentation:"
 log "https://www.phusionpassenger.com/library/install/apache/multiple_apache_installs.html"
 end
 end

def result_for(apxs2)
        # All the results use realpaths, so the input must too.
        apxs2 = try_realpath(apxs2)
        return @results.find { |r| r.apxs2 == apxs2 }
      end

private
      def log(message)
        if @output.tty?
          @output.puts(Utils::AnsiColors.ansi_colorize(message))
        else
          @output.puts(Utils::AnsiColors.strip_color_tags(message))
        end
      end

# On Ubuntu, /usr/bin/apxs2 is a symlink to /usr/bin/apxs.
      # On recent Arch Linux releases, /bin, /sbin etc are symlinks to
      # /usr/bin and /usr/sbin.
      # We're only supposed to detect one Apache in that case so we need to
      # resolve symlinks.
      def remove_symlink_duplications(filenames)
        old_size = filenames.size
        filenames = filenames.map do |filename|
          try_realpath(filename)
        end
        filenames.uniq!
        if old_size != filenames.size
          log "#{old_size - filenames.size} symlink duplicate(s) detected; ignoring them."
        end
        return filenames
      end

def add_result
 result = Result.new(self)
 if yield(result)
 @results << result
 else
 @failures += 1
 end
 end

def try_realpath(path)
        if path
          begin
            Pathname.new(path).realpath.to_s
          rescue Errno::ENOENT, Errno::EACCES, Errno::ENOTDIR
            path
          end
        else
          nil
        end
      end
    end

end
end # module Phusion Passenger

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