Date: Fri, 22 Aug 2008 14:05:26 +0200 From: Christian Brueffer <brueffer@FreeBSD.org> To: Ivan Voras <ivoras@freebsd.org> Cc: brooks@freebsd.org, freebsd-arch@freebsd.org Subject: Re: Magic symlinks redux Message-ID: <20080822120525.GA1366@haakonia.hitnet.RWTH-Aachen.DE> In-Reply-To: <g8m458$d3$1@ger.gmane.org> References: <g8kv7v$sp2$1@ger.gmane.org> <20080822090448.GB57441@onelab2.iet.unipi.it> <48AE89DC.9080408@yandex.ru> <g8m458$d3$1@ger.gmane.org>
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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@unixpages.org brueffer@FreeBSD.org
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