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From:	David Boyce <dsb AT boyski DOT com>
Date:	Fri, 17 Jan 2014 11:30:54 -0500
Message-ID:	<CACUHbYP9zSQDENbt1tV9WY_jQx5ayxySfTVryt6u6nZAD5u88A@mail.gmail.com>
Subject:	Re: Add retry logic to rebaseall
To:	cygwin AT cygwin DOT com
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Jason,

On Fri, Jan 17, 2014 at 11:13 AM, Jason Tishler <jason AT tishler DOT net> wrote:
> AFAICT, there is a race condition issue with the proposed functionality.
> David's build servers could be quiescent when the check for running
> processes is performed, but they could restart before the rebase is
> finished.  I realize the window is very small, but it is nevertheless
> nonzero, so the rebase could still fail.

I don't think race condition is the right phrase here. This is the
exact same situation faced by the existing rebaseall functionality; it
knows there are no Cygwin processes running at start time but any
process could start between then and end time. I agree there's a
window where things could go wrong, but this feature doesn't worsen
it. Closing that window is an orthogonal effort, IMHO; the new flag
isn't called --make-sure-the-rebase-works-dammit.

> There are also formatting issues with the patch.  For example, the
> addition of the while loop requires lines to be shifted to the right.
> I know rebaseall unfortunately has a mixture of tabs and spaces, but
> after applying the patch some lines are not indented correctly.

I had a paragraph about that in the original email which got rejected
due to "spam score too high" so I cut the text down for the second try
and ended up losing that part. Yes, the original has a mix of tabs and
spaces and my editor might be configured differently from yours, so I
made the patch using "diff -u -w". That may have been a mistake; I'm
happy to clean it up if asked.

> IMO, the proposed functionality is very specialized and doesn't seem to
> be generally applicable.  This functionality could also be implemented
> (by the few who need it) as a very simple wrapper script that calls
> rebaseall until is succeeds.  This approach would also workaround the
> race condition.

How so? The behavior and risk factors would be identical as far as I can see.

David

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