Class: WoofUtil

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

Class Method Summary collapse

Class Method Details

.shellout(cmd, params = {}) ⇒ Object

usage shellout “xargs”, :stdin => “/etc”, :args => [“ls”, “-ld”]



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# File 'lib/woof_util.rb', line 5

def self.shellout(cmd, params = {})
  params[:stdin] ||= ""
  params[:args] ||= []
  
  parent_r,child_w=IO.pipe ; parent_r.binmode ; child_w.binmode
  child_r,parent_w=IO.pipe ; child_r.binmode ; parent_w.binmode

  pid = fork do
    parent_r.close
    parent_w.close
    $stdin.reopen child_r
    $stdout.reopen child_w
    $stderr.reopen child_w
    # should be closing other open FDs, punting on it for now
    exec *([cmd].concat params[:args])
  end
  child_w.close
  child_r.close
  buf = []
  parent_w.write params[:stdin]
  parent_w.close
  while Process.waitpid(pid, Process::WNOHANG).nil? do
    buf.push(parent_r.read 4096)
  end
  buf.push(parent_r.read 4096)
  parent_r.close
  buf.join
end