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Re: Proposed new POSIX sh policy

On Wed, Nov 15, 2006 at 10:46:51AM -0800, Russ Allbery wrote:
> Bill Allombert <allomber@math.u-bordeaux.fr> writes:
> > Hard-coding path is frowned upon theses days and there is no standard
> > way to disable a shell built-in, so in practice we are actively
> > prevented from using coreutils test and thus coreutils test features. So
> > the question is not merely what should be the default.
> Who is arguing that you can't use /usr/bin/test when you explicitly need a
> feature of coreutils test?  The relevant Policy section says:
>     Programs called from maintainer scripts should not normally have a
>     path prepended to them. Before installation is started, the package
>     management system checks to see if the programs ldconfig,
>     start-stop-daemon, install-info, and update-rc.d can be found via the
>     PATH environment variable. Those programs, and any other program that
>     one would expect to be on the PATH, should thus be invoked without an
>     absolute pathname. Maintainer scripts should also not reset the PATH,
>     though they might choose to modify it by prepending or appending
>     package-specific directories. These considerations really apply to all
>     shell scripts.
> That's a "should normally," not a must, and this sort of situation is
> seems to me to be exactly why it says "should normally" instead of "must."
> The reason for not prepending a path is that it's pointless and may create
> problems later if the binary moves.  The first is not true in this case,
> and I don't think the second is strong enough by itself.
> In fact, if you squint the right way, that paragraph gives a sort of
> blessing to using an absolute path in this situation, since coreutils test
> is not quite "any other program that one would expect to be on the PATH"
> simply because in this case the shell isn't going to *look* at the PATH.

Of course, any scripts that may be run before mounting /usr must not use

Regards: David
 /) David Weinehall <tao@debian.org> /) Rime on my window           (\
//  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~   //  Diamond-white roses of fire //
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