module ImageOptim::Cmd
Helper for running commands
Public Class Methods
capture(cmd)
click to toggle source
Run using backtick Return captured output Will raise SignalException if process was interrupted
# File lib/image_optim/cmd.rb, line 42 def capture(cmd) output = `#{cmd}` check_status! output end
run(*args) { |pid| ... }
click to toggle source
Run using `system` Return success status Will raise SignalException if process was interrupted
# File lib/image_optim/cmd.rb, line 10 def run(*args) if Process.respond_to?(:spawn) if args.last.is_a?(Hash) args.last[Gem.win_platform? ? :new_pgroup : :pgroup] = true end begin pid = Process.spawn(*args) ensure yield pid if block_given? end begin Process.waitpid(pid) rescue Errno::ECHILD return end check_status! $CHILD_STATUS.success? else success = system(*args) check_status! success end end
Private Class Methods
check_status!()
click to toggle source
# File lib/image_optim/cmd.rb, line 52 def check_status! status = $CHILD_STATUS return unless status.signaled? # jruby incorrectly returns true for `signaled?` if process exits with # non zero status. For following code # # `sh -c 'exit 66'` # p [$?.signaled?, $?.exitstatus, $?.termsig] # # jruby outputs `[true, 66, 66]` instead of expected `[false, 66, nil]` return if defined?(JRUBY_VERSION) && status.exitstatus == status.termsig fail SignalException, status.termsig end