[MERGE REVIEW] Commit handles locking problems better

[Martin Pool]

On 17 Mar 2006, Aaron Bentley <aaron.bentley at utoronto.ca> wrote:

> Hi all,
> 
> This patch ensures that commit throws the correct exception when it
> encounters an error locking the master branch.

+1 for the test.

I guess the code change is OK too, though the way in which the lock is
acquired and released is a bit convoluted.  I suppose this is an
improvement and we can clean it more later.

-- 
Martin
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