module ProcessExecuter

Execute the specified command as a subprocess and return the exit status

This is a convenience method that calls Process.spawn and blocks until the command has terminated.

The command will be send the SIGKILL signal if it does not terminate within the specified timeout.

@example

status = ProcessExecuter.spawn('echo hello')
status.exited? # => true
status.success? # => true

@example with a timeout

status = ProcessExecuter.spawn('sleep 10', timeout: 0.01)
status.exited? # => false
status.success? # => nil
status.signaled? # => true
status.termsig # => 9

@example capturing stdout to a string

stdout = StringIO.new
status = ProcessExecuter.spawn('echo hello', out: stdout)
stdout.string # => "hello"

@see ruby-doc.org/core-3.1.2/Kernel.html#method-i-spawn Kernel.spawn

documentation for valid command and options

@see ProcessExecuter::Options#initialize See ProcessExecuter::Options#initialize

for options that may be specified

@param command [Array<String>] the command to execute @param options_hash [Hash] the options to use when exectuting the command

@return [Process::Status] the exit status of the proceess

# File lib/process_executer.rb, line 50
def self.spawn(*command, **options_hash)
  options = ProcessExecuter::Options.new(**options_hash)
  pid = Process.spawn(*command, **options.spawn_options)
  wait_for_process(pid, options)
end

Wait for process to terminate

If a timeout is speecified in options, kill the process after options.timeout seconds.

@param pid [Integer] the process id @param options [ProcessExecuter::Options] the options used

@return [ProcessExecuter::Status] the status of the process

@api private

# File lib/process_executer.rb, line 67
                     def self.wait_for_process(pid, options)
  Timeout.timeout(options.timeout) do
    ProcessExecuter::Status.new(Process.wait2(pid).last, false)
  end
rescue Timeout::Error
  Process.kill('KILL', pid)
  ProcessExecuter::Status.new(Process.wait2(pid).last, true)
end