Re: [Patch] Using 'perl' in *.sh

On Sun, 2006-07-09 13:33:04 -0700, Junio C Hamano <junkio@cox.net> wrote:
> Michal Rokos <michal.rokos@nextsoft.cz> writes:
> > On Sunday 09 July 2006 12:14, Junio C Hamano wrote:
> >> Michal, is there a reason you do not want to have the version of
> >> perl you teach git tools via #! lines with PERL_PATH on your $PATH?
> >
> > I have no problem with that. I can set $PATH.
> > But then I'd suggest to change magic #!
> > from #!/usr/bin/perl
> > to #!/usr/bin/env perl
> > for *.perl
> >
> > It that what you meant?
> 
> No, that is not what I meant.

Though I think you actually should :-)

> Invocation of perl _in_ scripts can be controlled by user's
> PATH, but #! cannot be.  As Merlyn says 'env' is a nice hack,
> but we configure the scripts we install to have #!  pointing at
> the right interpreter as a more cleaner (than using 'env', that
> is) workaround anyway, so #! pointing at PERL_PATH and scripts
> relying on user's $PATH would be the right thing to do.

It's just a question of the target system, so: What is our target? If
we target a fairly recent Unix box, we'd put whatever a user asked for
into the shellbang, and hope that he properly sets $PATH.

If we try to aim at POSIX systems, then first of all, `env' isn't a
hack. It's specified i the POSIX documents, even argument passing is
given. (So if `#!/usr/bin/env perl -w' doesn't work on a HP-UX system,
that's simply broken wrt. POSIX.)

At the maximum, we'd allow the user to supply the location of `env' if
it's not /usr/bin/env, but I guess you'll find a hard time finding a
system where there's no /usr/bin/env...  The final killer would be to
explicitely mention the interpreter and install all scripts a-x to
force that :-)

MfG, JBG

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