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

#install(values) ⇒ Object 



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

def install(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)
    
    # 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