Module: PlatformInfo

Defined in:
lib/phusion_passenger/platform_info.rb

Overview

This module autodetects various platform-specific information, and provides that information through constants.

Users can change the detection behavior by setting the environment variable APXS2 to the correct ‘apxs’ (or ‘apxs2’) binary, as provided by Apache.

Constant Summary collapse

RUBY =

The absolute path to the current Ruby interpreter.


      
        
GEM =
          

  

    

The correct ‘gem’ command for this Ruby interpreter.



  





  



        

        
locate_ruby_executable('gem')

      
    

  







  
    

      Class Method Summary
      collapse
    


    
  



  

    
Class Method Details


    
      

  

  
    .apache2_bindir  ⇒ Object 
  

  

  




  

    

The absolute path to the Apache 2 ‘bin’ directory.



  





  



  

    
      


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# File 'lib/phusion_passenger/platform_info.rb', line 312

def self.apache2_bindir
	if apxs2.nil?
		return nil
	else
		return `#{apxs2} -q BINDIR 2>/dev/null`.strip
	end
end

    		
  





    
      

  

  
    .apache2_module_cflags(with_apr_flags = true)  ⇒ Object 
  

  

  




  

    

The C compiler flags that are necessary to compile an Apache module. Possibly includes APR and APU compiler flags.



  





  



  

    
      


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# File 'lib/phusion_passenger/platform_info.rb', line 384

def self.apache2_module_cflags(with_apr_flags = true)
	flags = ["-fPIC"]
	if with_apr_flags
		flags << apr_flags
		flags << apu_flags
	end
	if !apxs2.nil?
		apxs2_flags = `#{apxs2} -q CFLAGS`.strip << " -I" << `#{apxs2} -q INCLUDEDIR`.strip
		apxs2_flags.gsub!(/-O\d? /, '')

		# Remove flags not supported by GCC
		if RUBY_PLATFORM =~ /solaris/ # TODO: Add support for people using SunStudio
			# The big problem is Coolstack apxs includes a bunch of solaris -x directives.
			options = apxs2_flags.split
			options.reject! { |f| f =~ /^\-x/ }
			options.reject! { |f| f =~ /^\-Xa/ }
			options.reject! { |f| f =~ /^\-fast/ }
			options.reject! { |f| f =~ /^\-mt/ }
			apxs2_flags = options.join(' ')
		end
		
		apxs2_flags.strip!
		flags << apxs2_flags
	end
	if !httpd.nil? && RUBY_PLATFORM =~ /darwin/
		# The default Apache install on OS X is a universal binary.
		# Figure out which architectures it's compiled for and do the same
		# thing for mod_passenger. We use the 'file' utility to do this.
		#
		# Running 'file' on the Apache executable usually outputs something
		# like this:
		#
		#   /usr/sbin/httpd: Mach-O universal binary with 4 architectures
		#   /usr/sbin/httpd (for architecture ppc7400):     Mach-O executable ppc
		#   /usr/sbin/httpd (for architecture ppc64):       Mach-O 64-bit executable ppc64
		#   /usr/sbin/httpd (for architecture i386):        Mach-O executable i386
		#   /usr/sbin/httpd (for architecture x86_64):      Mach-O 64-bit executable x86_64
		#
		# But on some machines, it may output just:
		#
		#   /usr/sbin/httpd: Mach-O fat file with 4 architectures
		#
		# (http://code.google.com/p/phusion-passenger/issues/detail?id=236)
		output = `file "#{httpd}"`.strip
		if output =~ /Mach-O fat file/ && output !~ /for architecture/
			architectures = ["-arch i386 -arch ppc -arch x86_64 -arch ppc64"]
		else
			architectures = []
			output.split("\n").grep(/for architecture/).each do |line|
				line =~ /for architecture (.*?)\)/
				architectures << "-arch #{$1}"
			end
		end
		flags << architectures.compact.join(' ')
	end
	return flags.compact.join(' ').strip
end

    		
  





    
      

  

  
    .apache2_module_ldflags  ⇒ Object 
  

  

  




  

    

Linker flags that are necessary for linking an Apache module. Possibly includes APR and APU linker flags.



  





  



  

    
      


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# File 'lib/phusion_passenger/platform_info.rb', line 445

def self.apache2_module_ldflags
	flags = "-fPIC #{apr_libs} #{apu_libs}"
	flags.strip!
	return flags
end

    		
  





    
      

  

  
    .apache2_sbindir  ⇒ Object 
  

  

  




  

    

The absolute path to the Apache 2 ‘sbin’ directory.



  





  



  

    
      


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# File 'lib/phusion_passenger/platform_info.rb', line 322

def self.apache2_sbindir
	if apxs2.nil?
		return nil
	else
		return `#{apxs2} -q SBINDIR`.strip
	end
end

    		
  





    
      

  

  
    .apache2ctl  ⇒ Object 
  

  

  




  

    

The absolute path to the ‘apachectl’ or ‘apache2ctl’ binary.



  





  



  

    
      


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# File 'lib/phusion_passenger/platform_info.rb', line 234

def self.apache2ctl
	return find_apache2_executable('apache2ctl', 'apachectl2', 'apachectl')
end

    		
  





    
      

  

  
    .apr_config  ⇒ Object 
  

  

  




  

    

The absolute path to the ‘apr-config’ or ‘apr-1-config’ executable.



  





  



  

    
      


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# File 'lib/phusion_passenger/platform_info.rb', line 258

def self.apr_config
	if env_defined?('APR_CONFIG')
		return ENV['APR_CONFIG']
	elsif apxs2.nil?
		return nil
	else
		filename = `#{apxs2} -q APR_CONFIG 2>/dev/null`.strip
		if filename.empty?
			apr_bindir = `#{apxs2} -q APR_BINDIR 2>/dev/null`.strip
			if apr_bindir.empty?
				return nil
			else
				return select_executable(apr_bindir,
					"apr-1-config", "apr-config")
			end
		elsif File.exist?(filename)
			return filename
		else
			return nil
		end
	end
end

    		
  





    
      

  

  
    .apr_config_needed_for_building_apache_modules?  ⇒ Boolean 
  

  

  




  

    

Returns whether it is necessary to use information outputted by ‘apr-config’ and ‘apu-config’ in order to compile an Apache module. When Apache is installed with –with-included-apr, the APR/APU headers are placed into the same directory as the Apache headers, and so ‘apr-config’ and ‘apu-config’ won’t be necessary in that case.



  





  

Returns:


    
  
    
  • 
      
      
        (Boolean)
      
      
      
    
    • 
  





  

    
      


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# File 'lib/phusion_passenger/platform_info.rb', line 481

def self.apr_config_needed_for_building_apache_modules?
	filename = File.join("/tmp/passenger-platform-check-#{Process.pid}.c")
	File.open(filename, "w") do |f|
		f.puts("#include <apr.h>")
	end
	begin
		return !system("(gcc #{apache2_module_cflags(false)} -c '#{filename}' -o '#{filename}.o') >/dev/null 2>/dev/null")
	ensure
		File.unlink(filename) rescue nil
		File.unlink("#{filename}.o") rescue nil
	end
end

    		
  





    
      

  

  
    .apr_flags  ⇒ Object 
  

  

  




  

    

The C compiler flags that are necessary for programs that use APR.



  





  



  

    
      


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# File 'lib/phusion_passenger/platform_info.rb', line 453

def self.apr_flags
	return determine_apr_info[0]
end

    		
  





    
      

  

  
    .apr_libs  ⇒ Object 
  

  

  




  

    

The linker flags that are necessary for linking programs that use APR.



  





  



  

    
      


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# File 'lib/phusion_passenger/platform_info.rb', line 458

def self.apr_libs
	return determine_apr_info[1]
end

    		
  





    
      

  

  
    .apu_config  ⇒ Object 
  

  

  




  

    

The absolute path to the ‘apu-config’ or ‘apu-1-config’ executable.



  





  



  

    
      


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# File 'lib/phusion_passenger/platform_info.rb', line 283

def self.apu_config
	if env_defined?('APU_CONFIG')
		return ENV['APU_CONFIG']
	elsif apxs2.nil?
		return nil
	else
		filename = `#{apxs2} -q APU_CONFIG 2>/dev/null`.strip
		if filename.empty?
			apu_bindir = `#{apxs2} -q APU_BINDIR 2>/dev/null`.strip
			if apu_bindir.empty?
				return nil
			else
				return select_executable(apu_bindir,
					"apu-1-config", "apu-config")
			end
		elsif File.exist?(filename)
			return filename
		else
			return nil
		end
	end
end

    		
  





    
      

  

  
    .apu_flags  ⇒ Object 
  

  

  




  

    

The C compiler flags that are necessary for programs that use APR-Util.



  





  



  

    
      


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# File 'lib/phusion_passenger/platform_info.rb', line 463

def self.apu_flags
	return determine_apu_info[0]
end

    		
  





    
      

  

  
    .apu_libs  ⇒ Object 
  

  

  




  

    

The linker flags that are necessary for linking programs that use APR-Util.



  





  



  

    
      


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# File 'lib/phusion_passenger/platform_info.rb', line 468

def self.apu_libs
	return determine_apu_info[1]
end

    		
  





    
      

  

  
    .apxs2  ⇒ Object 
  

  

  




  

    

The absolute path to the ‘apxs’ or ‘apxs2’ executable, or nil if not found.



  





  



  

    
      


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# File 'lib/phusion_passenger/platform_info.rb', line 219

def self.apxs2
	if env_defined?("APXS2")
		return ENV["APXS2"]
	end
	['apxs2', 'apxs'].each do |name|
		command = find_command(name)
		if !command.nil?
			return command
		end
	end
	return nil
end

    		
  





    
      

  

  
    .debugging_cflags  ⇒ Object 
  

  

  




  

    

C compiler flags that should be passed in order to enable debugging information.



  





  



  

    
      


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# File 'lib/phusion_passenger/platform_info.rb', line 371

def self.debugging_cflags
	if RUBY_PLATFORM =~ /openbsd/
		# According to OpenBSD's pthreads man page, pthreads do not work
		# correctly when an app is compiled with -g. It recommends using
		# -ggdb instead.
		return '-ggdb'
	else
		return '-g'
	end
end

    		
  





    
      

  

  
    .find_command(name)  ⇒ Object 
  

  

  




  

    

Check whether the specified command is in $PATH, and return its absolute filename. Returns nil if the command is not found.



This function exists because system(‘which’) doesn’t always behave correctly, for some weird reason.



  





  



  

    
      


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# File 'lib/phusion_passenger/platform_info.rb', line 188

def self.find_command(name)
	ENV['PATH'].split(File::PATH_SEPARATOR).detect do |directory|
		path = File.join(directory, name.to_s)
		if File.executable?(path)
			return path
		end
	end
	return nil
end

    		
  





    
      

  

  
    .httpd  ⇒ Object 
  

  

  




  

    

The absolute path to the Apache binary (that is, ‘httpd’, ‘httpd2’, ‘apache’ or ‘apache2’).



  





  



  

    
      


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# File 'lib/phusion_passenger/platform_info.rb', line 240

def self.httpd
	if env_defined?('HTTPD')
		return ENV['HTTPD']
	elsif apxs2.nil?
		["apache2", "httpd2", "apache", "httpd"].each do |name|
			command = find_command(name)
			if !command.nil?
				return command
			end
		end
		return nil
	else
		return find_apache2_executable(`#{apxs2} -q TARGET`.strip)
	end
end

    		
  





    
      

  

  
    .library_extension  ⇒ Object 
  

  

  




  

    

The current platform’s shared library extension (‘so’ on most Unices).



  





  



  

    
      


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# File 'lib/phusion_passenger/platform_info.rb', line 496

def self.library_extension
	if RUBY_PLATFORM =~ /darwin/
		return "bundle"
	else
		return "so"
	end
end

    		
  





    
      

  

  
    .linux_distro  ⇒ Object 
  

  

  




  

    

An identifier for the current Linux distribution. nil if the operating system is not Linux.



  





  



  

    
      


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# File 'lib/phusion_passenger/platform_info.rb', line 505

def self.linux_distro
	tags = linux_distro_tags
	if tags
		return tags.first
	else
		return nil
	end
end

    		
  





    
      

  

  
    .linux_distro_tags  ⇒ Object 
  

  

  




  

    

Autodetects the current Linux distribution and return a number of identifier tags. The first tag identifies the distribution while the other tags indicate which distributions it is likely compatible with. Returns nil if the operating system is not Linux.



  





  



  

    
      


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# File 'lib/phusion_passenger/platform_info.rb', line 518

def self.linux_distro_tags
	if RUBY_PLATFORM !~ /linux/
		return nil
	end
	lsb_release = read_file("/etc/lsb-release")
	if lsb_release =~ /Ubuntu/
		return [:ubuntu, :debian]
	elsif File.exist?("/etc/debian_version")
		return [:debian]
	elsif File.exist?("/etc/redhat-release")
		redhat_release = read_file("/etc/redhat-release")
		if redhat_release =~ /CentOS/
			return [:centos, :redhat]
		elsif redhat_release =~ /Fedora/
			return [:fedora, :redhat]
		elsif redhat_release =~ /Mandriva/
			return [:mandriva, :redhat]
		else
			# On official RHEL distros, the content is in the form of
			# "Red Hat Enterprise Linux Server release 5.1 (Tikanga)"
			return [:rhel, :redhat]
		end
	elsif File.exist?("/etc/suse-release")
		return [:suse]
	elsif File.exist?("/etc/gentoo-release")
		return [:gentoo]
	else
		return [:unknown]
	end
	# TODO: Slackware
end

    		
  





    
      

  

  
    .portability_cflags  ⇒ Object 
  

  

  




  

    

Compiler flags that should be used for compiling every C/C++ program, for portability reasons. These flags should be specified as last when invoking the compiler.



  





  



  

    
      


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# File 'lib/phusion_passenger/platform_info.rb', line 338

def self.portability_cflags
	flags = ["-D_REENTRANT -I/usr/local/include"]
	if RUBY_PLATFORM =~ /solaris/
		flags << '-D_XOPEN_SOURCE=500 -D_XPG4_2 -D__EXTENSIONS__ -D__SOLARIS__ -D_FILE_OFFSET_BITS=64'
		flags << '-DBOOST_HAS_STDINT_H' unless RUBY_PLATFORM =~ /solaris2.9/
		flags << '-D__SOLARIS9__ -DBOOST__STDC_CONSTANT_MACROS_DEFINED' if RUBY_PLATFORM =~ /solaris2.9/
		flags << '-mcpu=ultrasparc' if RUBY_PLATFORM =~ /sparc/
	elsif RUBY_PLATFORM =~ /openbsd/
		flags << '-DBOOST_HAS_STDINT_H -D_GLIBCPP__PTHREADS'
	elsif RUBY_PLATFORM =~ /aix/
		flags << '-DOXT_DISABLE_BACKTRACES'
	elsif RUBY_PLATFORM =~ /(sparc-linux|arm-linux|sh4-linux)/
		# http://code.google.com/p/phusion-passenger/issues/detail?id=200
		# http://groups.google.com/group/phusion-passenger/t/6b904a962ee28e5c
		flags << '-DBOOST_SP_USE_PTHREADS'
	end
	return flags.compact.join(" ").strip
end

    		
  





    
      

  

  
    .portability_ldflags  ⇒ Object 
  

  

  




  

    

Linker flags that should be used for linking every C/C++ program, for portability reasons. These flags should be specified as last when invoking the linker.



  





  



  

    
      


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# File 'lib/phusion_passenger/platform_info.rb', line 361

def self.portability_ldflags
	if RUBY_PLATFORM =~ /solaris/
		return '-lxnet -lrt -lsocket -lnsl -lpthread'
	else
		return '-lpthread'
	end
end

    		
  





    
      

  

  
    .rake  ⇒ Object 
  

  

  




  

    

Returns the absolute path to the Rake executable that belongs to the current Ruby interpreter. Returns nil if it doesn’t exist.



  





  



  

    
      


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# File 'lib/phusion_passenger/platform_info.rb', line 205

def self.rake
	return locate_ruby_executable('rake')
end

    		
  





    
      

  

  
    .rspec  ⇒ Object 
  

  

  




  

    

Returns the absolute path to the RSpec runner program that belongs to the current Ruby interpreter. Returns nil if it doesn’t exist.



  





  



  

    
      


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# File 'lib/phusion_passenger/platform_info.rb', line 213

def self.rspec
	return locate_ruby_executable('spec')
end