Class: Elevage::Runner

Inherits:
Object
  • Object
show all
Defined in:
lib/elevage/runner.rb

Overview

wrapper to assist aruba in single process execution

Instance Method Summary collapse

Constructor Details

#initialize(argv, stdin = STDIN, stdout = STDOUT, stderr = STDERR, kernel = Kernel) ⇒ Runner

Allow everything fun to be injected from the outside while defaulting to normal implementations.



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# File 'lib/elevage/runner.rb', line 7

def initialize(argv, stdin = STDIN, stdout = STDOUT, stderr = STDERR, kernel = Kernel)
  @argv, @stdin, @stdout, @stderr, @kernel = argv, stdin, stdout, stderr, kernel
end

Instance Method Details

#execute! ⇒ Object 



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# File 'lib/elevage/runner.rb', line 11

def execute!
  exit_code = begin
  # Thor accesses these streams directly rather than letting them be injected, so we replace them...
    $stderr = @stderr
    $stdin = @stdin
    $stdout = @stdout

    Elevage::CLI.start(@argv)

    # Thor::Base#start does not have a return value, assume success if no exception is raised.
    0
  rescue StandardError => e
    # The ruby interpreter would pipe this to STDERR and exit 1 in the case of an unhandled exception
    b = e.backtrace
    b.unshift("#{b.shift}: #{e.message} (#{e.class})")
    @stderr.puts(b.map { |s| "\tfrom #{s}" }.join("\n"))
    1
  ensure
    # put them back.
    $stderr = STDERR
    $stdin = STDIN
    $stdout = STDOUT
  end
  # Proxy exit code back to the injected kernel.
  @kernel.exit(exit_code)
end