Magic symlinks redux

[Christian Brueffer]

On Fri, Aug 22, 2008 at 12:24:41PM +0200, Ivan Voras wrote:
> Andrey V. Elsukov wrote:
> >Luigi Rizzo wrote:
> >>interestingly simple.
> >>
> >>Question - is the process' ENV easily available in this part
> >>of the kernel, so one could in principle use environment variables
> >>as replacement strings ?
> 
> >This was so long ago.. As i remember this patch is a quick port of
> >NetBSD's implementation and uses the same code.
> >
> >Also there was another implementation ported from DragonFlyBSD.
> >David Quattlebaum is working on varsyms implementation and he sent
> >fresh patch to me in this April. I attached patch.
> >And sorry, i am not working on this today..
> 
> This patch is huge. As far as I can tell DragonflyBSD has a whole 
> framework dedicated to varsyms, spread across a fair part of the kernel 
> and with at least one special userland utility. It allows the operator 
> to define his own variables that can be used in the substitutions, and I 
> don't see that it predefines "special" variables like "uid" and 
> "hostname". It's not necessarily a bad solution but I consider it overkill.
> 
> Anyway, the syntax of DFBSD's varsyms is similar but sufficiently 
> different from NetBSD's magicsyms implementation that both can coexist. 
> DFBSD uses  ${var} and NetBSD uses @var or @{var} so there's no 
> ambiguity between them.
> 
> Unless a kernel developer is interested in working the DFBSD's 
> implementation in, I'll push the NetBSD's variant.
> 
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Brooks has a varsym port in p4, see //depot/user/brooks/varsym/

- Christian

-- 
Christian Brueffer	chris at unixpages.org	brueffer at FreeBSD.org
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