[MERGE] Content filtering (EOL part 2 of 3)

[Robert Collins]

On Fri, 2008-07-18 at 22:49 +1000, Ian Clatworthy wrote:
> Robert Collins wrote:
> 
> > This would seem to allow me to wedge my working tree state between bzr
> > versions (e.g. a NFS mounted tree is at high risk of triggering this).
> > 
> > It needs some mechanism to prevent this IMO.
> > 
> > bb:resubmit
> 
> The mechanism which poolie and I have discussed & proposed is to add
> a section to .bzrrules which specifies the requirements needed to work
> on a branch. The trouble is that content filtering on its own is only
> a small part of the problem: ensuring other users - or other bzr
> instances on your own computer - also have the right versions of
> the right plugins is arguably necessary.

True.

> So .bzrrules will end up looking like (for example) ...
> 
>   [requires]
>   bzr = 1.6
>   bzr-eol = 0.2
> 
>   [name *.bat]
>   eol = dos
> 
> We believe this mechanism is both clean and powerful. For example,
> teams can use it to ensure plugins enforcing required hooks and
> policies are installed by team members while working on relevant
> code bases.

I like this part of it.

> There is undoubtedly devil in the detail, particularly when to comes
> to how this interacts with the smart server and remote branches in
> particular. We ought to take the time to get this feature right.
> 
> I don't agree however that this mechanism needs to land in order
> for us to land content filtering. To begin with, no plugin using
> content filtering will even load on versions of Bazaar without
> content filtering in the core - the registration API will be
> absent.

I agree that that mechanism can likely be deferred. (Not an unqualified
agreement - devil in the details). However, something to prevent old
bzr's even _looking_ at a content-filtered tree is IMO very important. 

> Don't retract your resubmit vote though. The patch is buggy and
> I'm working on a fixed version. :-(

Cool.

-Rob
-- 
GPG key available at: <http://www.robertcollins.net/keys.txt>.
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