Class: Teapot::Build::Targets::External

Inherits:
Teapot::Build::Target show all
Defined in:
lib/teapot/build/targets/external.rb

Constant Summary collapse

ENVIRONMENT_CHECKSUM_FILE =

This file contains a checksum of the build environment. If it changes, even though the source code hasn’t changed, it means that we need to recompile.

".teapot-environment-checksum"

Instance Attribute Summary

Attributes inherited from Teapot::Build::Target

#parent

Instance Method Summary collapse

Methods inherited from Teapot::Build::Target

#configure, #execute, target

Constructor Details

#initialize(parent, directory, &block) ⇒ External

Returns a new instance of External.



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# File 'lib/teapot/build/targets/external.rb', line 31

def initialize(parent, directory, &block)
	super parent
	
	@directory = directory
	
	# Callback for preparing the target and compiling/installing the target.
	@install = block
end

Instance Method Details

#build(values) ⇒ Object 



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# File 'lib/teapot/build/targets/external.rb', line 44

def build(values)
	return unless @install
	
	source_path = @parent.root + @directory
	build_source_path = values[:build_prefix] + @directory
	build_source_checksum_path = build_source_path + ENVIRONMENT_CHECKSUM_FILE
	
	fresh = false
	
	# Check the environment checksum to catch any changes to the build environment:
	if build_source_checksum_path.exist? and File.read(build_source_checksum_path.to_s) != checksum(values)
		FileUtils.rm_rf(build_source_path.to_s) if build_source_path.exist?
	end
	
	if !build_source_path.exist?
		build_source_path.mkpath
		
		FileUtils.cp_r(source_path.children, build_source_path.to_s, :preserve => true)
		
		# Write the environment checksum out to a file:
		File.write(build_source_checksum_path, checksum(values))
		
		fresh = true
	end
	
	# Convert the hash to suit typical shell specific arguments:
	shell_environment = Environment::System::convert_to_shell(values)
	
	Dir.chdir(build_source_path) do
		RExec.env(shell_environment) do
			@install.call(Environment::Evaluator.new(values), fresh)
		end
	end
end

#root ⇒ Object 



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# File 'lib/teapot/build/targets/external.rb', line 40

def root
	@parent.root + @directory
end