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Re: shellcommands not executing - lock problem?

From: Mark . Burgess
Subject: Re: shellcommands not executing - lock problem?
Date: Wed, 25 Feb 2004 17:26:03 +0100 (MET)

Hash is a good idea. I'll give it some thought.


On 25 Feb, Pete Ehlke wrote:
> On Tue Feb 24, 2004 at 12:10:25 -0800, Eric Sorenson wrote:
>>This would be lots better; this problem has come up several times and
>>is always a frustrating stumper. 50 characters is clearly not long enough
>>for uniqueness when variable expansion is taken into account. Doubling
>>it would help somewhat but it would just be postponing the problem. Note
>>this is not just true for shellcommands: but copy: also
> Yup. Eric and I have talked at some length about this off-list. There's
> really no good way to make locking work reliably using the current
> algorithm: absolute path names of, say, 1024 characters are pathological
> and gross, but they're certainly legal. And in my environment, I have a
> fair number of copy: items whose absolute path names do not diverge
> until well after 100 characters.
> The real solution is to modify the locking scheme to generate a hash of
> some sort from the variable name, but that's a somewhat less than
> trivial modification. It's on my list of round tuit items, but given my
> current schedule and work responsibilities, I doubt that I'll be able to
> make any significant progress on a patch for several months.
> -Pete
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