Illegal Filesystem characters in revision names

[Martin Pool]

On  6 Dec 2005, Aaron Bentley <aaron.bentley at utoronto.ca> wrote:
> 
> Robert Collins wrote:
> | My preference is to escape characters we dont want, which could be
> | anything outside the legitimate URL character set (i.e. all non-7bit
> | ascii characters and some of those too). This makes it as simple as
> | possible for interoperation with other systems that have an analagous
> | concept. I.e. to convert CVS one might use the CVS repository prefix +
> | the dotted decimal revision to create a bzr rev id.
> 
> I agree.  I'd add that using the filesystem naming restrictions feels to
> me like a very leaky abstraction, and a very ill-defined one.  It
> sacrifices utility and predictability for ease-of implementation.
> 
> Having an irregular system like this forces other layers to do encoding
> and decoding, violating DRY.

I don't see how a rule of "ids must only use certain specified
characters" will violate Don't Repeat Yourself.  We have to specify
something about what is allowed - at least that it is either a byte or
unicode string.

-- 
Martin
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