Re: difftool uses hardcoded perl shebang

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On Tue, Dec 19, 2017 at 08:33:22AM -0800, Junio C Hamano wrote:

> Jeff King <peff@xxxxxxxx> writes:
> 
> > This is a build-time knob. When you build git, try:
> >
> >   make PERL_PATH='/usr/bin/env perl'
> >
> > (If you don't build your own git, then you might raise the issue with
> > whomever packages your binary).
> 
> I somehow thought ANYTHING_PATH was meant to point at the exact path
> (as opposed to ANYTHING_COMMAND which is a command line), so it is
> within our rights to do
> 
>     test -x "$GIT_EXEC_PATH" || die "Your Git installation is broken"
> 
> but your suggestion above makes such a sanity check impossible.

Hmm, you're right. Though it looks like it is only the test scripts
which actually use this feature. It would be nice if we supported this.
Unfortunately it's hard to make both of these work:

  make PERL_PATH='/usr/bin/env perl'

  make PERL_PATH='/path with spaces/perl'

We must protect the spaces in the latter case and treat it as a single
unit, but would not want to in the former.

In the meantime, pointing to the actual build-time perl is a workaround
(but obviously not if it's being done by a third-party packager who has
no idea where your perl is).

-Peff



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