Class: RightGit::Shell::Default

Inherits:
Object
  • Object
show all
Includes:
Interface, Singleton
Defined in:
lib/right_git/shell/default.rb

Overview

Default shell singleton implementation.

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Interface

#default_logger

Class Method Details

.method_missing(method_sym, *arguments, &block) ⇒ Object 



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# File 'lib/right_git/shell/default.rb', line 42

def self.method_missing(method_sym, *arguments, &block)
  if instance.respond_to?(method_sym)
    instance.send(method_sym, *arguments, &block)
  else
    super
  end
end

.respond_to?(*arguments) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/right_git/shell/default.rb', line 38

def self.respond_to?(*arguments)
  instance.respond_to?(*arguments) || super
end

Instance Method Details

#clear_env_vars(names) { ... } ⇒ TrueClass

Clears (set-to-nil) the given list of environment variables while executing the given block.

Parameters:

  • names (Array) —

    of variables to clear

Yields:

  • called with environment cleared

Returns:

  • (TrueClass) —

    always true



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# File 'lib/right_git/shell/default.rb', line 172

def clear_env_vars(names, &block)
  save_vars = {}
  names.each do |k|
    k = k.to_s
    save_vars[k] = ENV[k]
    ENV[k] = nil
  end
  begin
    yield
  ensure
    names.each do |k|
      k = k.to_s
      ENV[k] = save_vars[k]
    end
  end
  true
end

#configure_executioner(executioner, options) ⇒ Proc

Encapsulates the given executioner with child-process-modifying behavior based on options. Builds the executioner as a series of callbacks.

Parameters:

  • executioner (Proc) —

    to configure

  • options (Hash) —

    for execution

Returns:

  • (Proc) —

    configured executioner



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# File 'lib/right_git/shell/default.rb', line 109

def configure_executioner(executioner, options)
  # set specific environment variables, if requested.
  sev = options[:set_env_vars]
  if (sev && !sev.empty?)
    executioner = lambda do |e|
      lambda { set_env_vars(sev) { e.call } }
    end.call(executioner)
  end

  # clear specific environment variables, if requested.
  cev = options[:clear_env_vars]
  if (cev && !cev.empty?)
    executioner = lambda do |e|
      lambda { clear_env_vars(cev) { e.call } }
    end.call(executioner)
  end

  # working directory.
  if directory = options[:directory]
    executioner = lambda do |e, d|
      lambda { ::Dir.chdir(d) { e.call } }
    end.call(executioner, directory)
  end
  executioner
end

#execute(cmd, options = {}) ⇒ Object

Implements execute interface.



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# File 'lib/right_git/shell/default.rb', line 51

def execute(cmd, options = {})
  options = {
    :directory        => nil,
    :logger           => nil,
    :outstream        => nil,
    :raise_on_failure => true,
    :set_env_vars     => nil,
    :clear_env_vars   => nil,
  }.merge(options)
  logger = options[:logger] || default_logger
  outstream = options[:outstream]

  # build execution block.
  exitstatus = nil
  executioner = lambda do
    logger.info("+ #{cmd}")
    ::IO.popen("#{cmd} 2>&1", 'r') do |output|
      output.sync = true
      done = false
      while !done
        begin
          data = output.readline
          if outstream
            outstream << data
          else
            logger.info(data.strip)
          end
        rescue ::EOFError
          done = true
        end
      end
    end
    exitstatus = $?.exitstatus
    if (!$?.success? && options[:raise_on_failure])
      raise ShellError, "Execution failed with exitstatus #{exitstatus}"
    end
  end

  # configure and invoke.
  configure_executioner(executioner, options).call

  return exitstatus
end

#output_for(cmd, options = {}) ⇒ Object

Implements output_for interface.



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# File 'lib/right_git/shell/default.rb', line 96

def output_for(cmd, options = {})
  output = StringIO.new
  execute(cmd, options.merge(:outstream => output))
  output.string
end

#set_env_vars(variables) { ... } ⇒ TrueClass

Sets the given list of environment variables while executing the given block.

Parameters

Yield

Return

Parameters:

  • variables (Hash) —

    to set

Yields:

  • called with environment set

Returns:

  • (TrueClass) —

    always true



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# File 'lib/right_git/shell/default.rb', line 146

def set_env_vars(variables)
  save_vars = {}
  variables.each do |k, v|
    k = k.to_s
    save_vars[k] = ENV[k]
    ENV[k] = v.nil? ? v : v.to_s
  end
  begin
    yield
  ensure
    variables.each_key do |k|
      k = k.to_s
      ENV[k] = save_vars[k]
    end
  end
  true
end