Re: [gentoo-dev] [RFC] New GLEP: file installation masks

[Michael Orlitzky <mjo@gentoo.org>]

On 05/20/2016 11:44 AM, Michał Górny wrote:
> 
> I'd make '@' signify group names, like we do for sets. This would have
> the side limitation that it would make it impossible to filter
> filenames starting with '@' with the currently supported
> path-or-filename syntax.
> 

That may be the best we can do, but in that case it's only fair to
mention the exception in the GLEP. I know you don't want implementation
details in there, but if *nobody* can come up with an implementation
that doesn't invalidate some well-defined paths, then we should
weasel-word the spec so that we don't wind up with zero fully-compliant
package managers =)

The @set notation isn't as much of a problem since it doesn't collide
with package atoms... which gives me an idea. If we make "/" illegal in
group names, then "@dir/*.*" can be interpreted as a path. That's a
little better.

Or, if we specify that the fnmatch pattern is applied to the absolute
path, I think you can stick a leading "/*" on any pattern without loss
of generality. So if you wanted to block all PDF files beginning with an
"@", then instead of "@*.pdf" you could do "/*@*.pdf".