module ImageOptim::Cmd
Helper for running commands
Public Class Methods
capture(cmd)
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Run using backtick Return captured output Will raise SignalException if process was interrupted
# File lib/image_optim/cmd.rb, line 21 def capture(cmd) output = `#{cmd}` check_status! output end
run(*args)
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Run using ‘system` Return success status Will raise SignalException if process was interrupted
# File lib/image_optim/cmd.rb, line 10 def run(*args) success = system(*args) check_status! success end
Private Class Methods
check_status!()
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# File lib/image_optim/cmd.rb, line 31 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