filesystem permissions using dump on live filesystem

[Ruben de Groot]

On Tue, Feb 24, 2004 at 12:32:07AM -0500, Garance A Drosihn typed:
> At 11:47 PM -0500 2/23/04, Aaron Peterson wrote:
> > > i put a user in the operator group in /etc/group:
> >
> >-snip-
> >
> >> and attempted to dump a live filesystem:
> >
> >-snip-
> >
> >> what am i missing here?
> >
> >nevermind.  i had to log out and log back in.  that solved my
> >problems.   now my only question is why does one have to log
> >out and log in for addition to a new group to take effect?
> 
> It is expected that the list of groups that you are a member of
> will not change very frequently.  Thus, the list of your groups
> is computed at login time, and is kept in memory.
> 
> If this was not done, then *anything* which checked your groups
> for access (such as reading a file) would have to read through
> all of /etc/group to re-calculate that list of groups.  Now, it
> would be easy enough to optimize that simple case (on a machine
> using just /etc/group), but there is no simple optimization if
> on machines which are using something like NIS+ or other network
> directory services to hold the group information.
> 
> If we really really had to, we could implement something that
> did that job acceptably well, but it's much easier to just
> tell people "log out, and log back in".  Or don't even logout,
> just 'ssh -l localhost' and start a new session.

I would usually just type "newgrp operators"

Ruben

> -- 
> Garance Alistair Drosehn            =   gad at gilead.netel.rpi.edu
> Senior Systems Programmer           or  gad at freebsd.org
> Rensselaer Polytechnic Institute    or  drosih at rpi.edu
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