Re: [PATCH 4/3] t/Makefile: introduce TEST_SHELL_PATH

> On Wed, Oct 25, 2017 at 11:35:44PM +0200, Johannes Schindelin wrote:
> 
> > > > Or alternatively we could prefix the assignment by
> > > > 
> > > > 	test -n "$TEST_SHELL_PATH" ||
> > > > 
> > > > or use the pattern
> > > > 
> > > > 	TEST_SHELL_PATH="${TEST_SHELL_PATH:-[...]}"
> > > 
> > > I'm not quite sure what this is fixing.  Is there a case where we
> > > wouldn't have TEST_SHELL_PATH set when running the tests? I think there
> > > are already other bits that assume that "make" has been run (including
> > > the existing reference to $SHELL_PATH, I think).
> > 
> > The way I read your patch, setting the environment variable differnently
> > at test time than at build time would be ignored: GIT-BUILD-OPTIONS is
> > sourced and would override whatever you told the test suite to use.
> > 
> > I guess it does not really matter all that much in practice.
> 
> Right. I find that behavior mildly irritating at times, but it's
> consistent with other items like NO_PERL, etc. E.g., you cannot do:
> 
>   make NO_PERL=
>   cd t
>   NO_PERL=Nope ./t3701-*
> 
> and disable perl. It's testing what got built.