From: Rogue Amateur <rogueamateur@...>
Date: 2006-07-12T01:21:20+09:00
Subject: Re: Nuby Q: Daemonize (other materials have been read!)

First, let me say thank you for the help.

  unknown wrote:
  > On Wed, 12 Jul 2006, Rogue Amateur wrote:
  >
[snip]
  >
  > here is a script which can be used on the command line to daemonize 
any
  > other process:
  >
  >    harp:~ > cat daemon.rb
  >    #! /usr//bin/env ruby
  >    fork{
  > STDIN.reopen(STDOUT.reopen(STDERR.reopen(open('/dev/null','r+'))));
  > fork{ system ARGV.join(' ') ? exit : abort } and exit! }
  >
  > use it like
  >
  > harp:~ > daemon.rb any_other_command

Ok, ignorance again:
1) this means I can't do the fork within the script itself?
2) suppose the any_other_command isn't in the default ruby library?  do 
I supply the full path to call?  Will it allow me to pass along 
arguments?
(I'll be trying it, as I await a response...)

  >
  >> FYI: I also need to figure out how to reset the userid and groupid, 
but
  >> I have a book. :)
  >
  > you cannot do this from withint a script

[snip]

  > my inclination would be to say that if you are reading
  > about it
  > you shouldn't use it!  ;-)

Gotcha.  So the follow on question is: if I need my now isolated process 
to run as a particular user/group, the process is...?  What?  My local 
guru, who speaks about 15 levels too high for me, said "set the user and 
group ids."  See, I can parrot! :)

I'm familiar with sudo, but... would that work with the daemon.rb?  (eg: 
sudo daemon.rb My_Ruby_Script.rb [arg] [arg]...)

Thanks again
Rogue Amateur

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