Re: [PATCH] t/perf: fix test_export() failure with BSD `sed`

[Eric Sunshine <sunshine@sunshineco.com>]

On Wed, Dec 16, 2020 at 2:07 PM Junio C Hamano <gitster@pobox.com> wrote:
> Eric Sunshine <sunshine@sunshineco.com> writes:
> >  test_export () {
> >       [ $# != 0 ] || return 0
> > -     test_export_="$test_export_\\|$1"
> > +     test_export_="$test_export_ $1"
> >       shift
> >       test_export "$@"
> >  }
>
> This "recursion to consume $@ one by one, instead of looping" caught
> my eyes a bit, but the bug being fixed is not caused by it, so it is
> fine to let it pass.

The unusual recursion caught my eye as well.

> Given that the arguments to test_export are
> supposed to be all variable names (i.e. no funny characters anywhere
> in it), I think it could just be
>
>         test_export () {
>                 test_export_="$*"
>         }
>
> though.

That's almost good enough, but test_export() needs to accumulate the
to-be-exported variables across multiple calls, so the non-recursive
definition would likely be:

    test_export () {
        test_export_="$test_export_ $*"
    }

which would make a nice cleanup atop this portability-fix patch.

> Oh, does anybody need to clear test_export_ to an empty string (or
> unset it), by the way?

Perhaps a test_unexport() might be handy in the distant future, but
presently there is only a single call to test_export() in the entire
suite, so it's probably not worth worrying about now.