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

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Hi Peff,

On Mon, 23 Oct 2017, Jeff King wrote:

> On Mon, Oct 23, 2017 at 01:01:42PM +0200, Johannes Schindelin wrote:
> 
> > On Fri, 20 Oct 2017, Jeff King wrote:
> > 
> > > @@ -2350,6 +2357,7 @@ GIT-LDFLAGS: FORCE
> > >  # and the first level quoting from the shell that runs "echo".
> > >  GIT-BUILD-OPTIONS: FORCE
> > >  	@echo SHELL_PATH=\''$(subst ','\'',$(SHELL_PATH_SQ))'\' >$@+
> > > +	@echo TEST_SHELL_PATH=\''$(subst ','\'',$(TEST_SHELL_PATH_SQ))'\' >$@+
> > 
> > Do we really want to force the test shell path to be hardcoded at runtime?
> > It may be a better idea not to write this into GIT-BUILD-OPTIONS.
> 
> My intent was to make it work "out of the box" in the same way as
> SHELL_PATH does now. So that:
> 
>   echo TEST_SHELL_PATH=whatever >>config.mak
>   make test
>   cd t && ./t1234-*
> 
> both respect it. Without going through BUILD-OPTIONS, I don't think it
> makes it into the environment via config.mak (it _does_ if you specify
> it on the command-line of "make", though).
> 
> For my purposes it would be fine to just use the environment, but I was
> trying to have it match the other variables for consistency.

Makes sense.

> > 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.

Ciao,
Dscho



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