Class: Command::Pipe

Inherits:
Object
  • Object
show all
Defined in:
lib/local/command.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(cmd, stderr: nil, fail: true) ⇒ Pipe 



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# File 'lib/local/command.rb', line 40

def initialize(cmd, stderr: nil, fail: true)
  @cmd = "set -o errexit\nset -o pipefail\n#{cmd}"
  @stderr = stderr
  @fail = fail

  @pw = IO::pipe # pipe[0] for read, pipe[1] for write
  @pr = IO::pipe
  @pe = IO::pipe

  STDOUT.flush

  @pid = fork {
    @pw[1].close
    @pr[0].close
    @pe[0].close

    STDIN.reopen(@pw[0])
    @pw[0].close

    STDOUT.reopen(@pr[1])
    @pr[1].close

    STDERR.reopen(@pe[1])
    @pe[1].close

    exec(cmd)
  }

  @pw[0].close
  @pr[1].close
  @pe[1].close
end

Instance Attribute Details

#cmd ⇒ Object (readonly)

Returns the value of attribute cmd.



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# File 'lib/local/command.rb', line 26

def cmd
  @cmd
end

#status ⇒ Object (readonly)

Returns the value of attribute status.



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# File 'lib/local/command.rb', line 27

def status
  @status
end

#stdin ⇒ Object (readonly)

Returns the value of attribute stdin.



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# File 'lib/local/command.rb', line 38

def stdin
  @stdin
end

#stdout ⇒ Object (readonly)

Remaining output not consumed by #get/#read or through #reader or #error



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# File 'lib/local/command.rb', line 37

def stdout
  @stdout
end

Instance Method Details

#error ⇒ Object 



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# File 'lib/local/command.rb', line 31

def error() @pe[0] end

#reader ⇒ Object 



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# File 'lib/local/command.rb', line 30

def reader() @pr[0] end

#wait ⇒ Object

Raises:



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# File 'lib/local/command.rb', line 73

def wait
  @pw[1].close
  @status = Process.waitpid2(@pid)[1].exitstatus

  out = @pr[0].readlines.map(&:chomp)
  err = @pe[0].readlines.map(&:chomp)

  @pr[0].close
  @pe[0].close

  raise Command::Error.new(@cmd, @status, nil, out, err) if @status != 0 && @fail == true

  case @stderr
    when true; [out, err]
    when false; out
    when nil
      $stderr.puts err
      out
  end
end

#writer ⇒ Object 



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# File 'lib/local/command.rb', line 29

def writer() @pw[1] end