Re: svn_fs/svn_repo repository lock API

Stefan Fuhrmann <stefan.fuhrmann_at_wandisco.com> writes:

> On Wed, Aug 8, 2012 at 4:57 PM, Mark Moe <markmoe19_at_gmail.com> wrote:
>> This would be useful for our us too. I would add "freeze" to the start and
>> "unfreeze" to the end of the script we use to rsync a copy of our repo (and
>> associated files) to an off-site network share.
>
> If freeze and unfreeze can be used quasi-independently,
> there should be a way to "recover" (unfreeze) the FSFS
> repo if the script using the new API failed.
>
> Maybe pass some string token to "freeze" and have an
> API to read that token (returning NULL for non-frozen
> repos). Some user-specific watchdog / recovery logic
> may then decide whether to call unfreeze or not.

The freeze-lock is similar to a write-lock: it exists for the duration
of the process that creates it. For scripts my trial freeze-program has
an interface like:

   freeze-program repo [repo ...] -c command [arg ...]

which freezes a number of repositories and then runs the given command.
When the freeze-program exits the repositories are unfrozen.

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