Date: Thu, 2 Jul 1998 10:33:32 +0200 (MET DST) From: Willem Jan Withagen <wjw@surf.IAE.nl> To: drosih@rpi.edu Cc: hackers@FreeBSD.ORG Subject: Re: Variant Link implementation, continued Message-ID: <199807020833.KAA29656@surf.IAE.nl> In-Reply-To: <v04011718b1c04403264f@[128.113.24.47]> References: <13617.899298865@time.cdrom.com>
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In article <v04011718b1c04403264f@[128.113.24.47]> you write:
>My initial reaction is that I wouldn't want links to depend on values
>in environment variables. If I setup some "clean environment" for a
>program I'm exec-ing, I'm not going to think to copy values which are
>important for these links to work.
>
>So there's two questions. One is how to you make sure you're looking
>at the correct & current environment, and the other is how do you know
>that that environment (once you find it) includes all the symbolic-
>link-related variables (and values) which will be expected.
I think I'd agree with you on this. Even Apollo's had certain links which
were very critical.
For those who never saw Domain OS:
Dependant on a env-variable (SYSTYPE) one would be able to
switch, on the fly, between 3 OS interfaces.
This would hold for:
the application layer, ( aka shells and programs )
include files
......
I used it a lot to switch between the differnt releases of software I was
maintaining. Working on an older version, just meant that I'd set the
env-variable MYVERSION to a previous release, then do a cd ~/src/project
and life was again simple.
Your argument would lead to introduce 2 types of resolution:
- important system-links, which are under control of 'root'.
The are extracted first from the/a sysctl-namespace, and then
(if not available there) from the users env.
- regular links, which follow the process Terry outlined in one of
the other messages: user-env, process-grp-env, init-env
--WjW
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