If by 'atomic' you mean 'do things all in one go, or not at all', then no, it isnt. To me it sounds like you want some sort of all-or-nothing transaction, in which either all the commands are complete, or none at all.

I'm not sure quite what those commands are doing, but what happens if you update the hostgroup, but fail to update the host, do you have an inconsistent system then? In which case you need to code some sort of 'undo' sub, which you can pass a value which indicates how far the script got before it encountered an error, and proceeds to undo the previous steps to return to the state the system was in before you started. And *then* it can die, or exit, or whatever..

Eg: 

chdir("$staging_directory")
     or undo(1);
system("svn", "update", "base")
     or undo(2);
...

sub undo 
{
  my $state = shift;
  if($state >= .. ) # highest one first
  ..
  if($state >= 2)
  {
     system("svn" .. ) # undo svn/update/base command
  }
  if($state >= 1)
  {
    chdir("-");  # undo chdir command
  }

   die "Got to level X: $!\n";
}

[download]
.. or something.. but maybe I misunderstood what you wanted. C.

In reply to Re: Is "die" the best way to be atomic? by castaway
in thread Is "die" the best way to be atomic? by BuddhaNature

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