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Re: [PATCH] various: disallow --no-no-OPT for --no-opt options

Am 19.04.2017 um 09:00 schrieb Ævar Arnfjörð Bjarmason:
On Wed, Apr 19, 2017 at 12:29 AM, René Scharfe <l.s.r@xxxxxx> wrote:
Setting PARSE_OPT_NONEG takes away the ability to toggle the affected
option.  E.g. git clone would reject --checkout.  Currently users can
specify --no- options as defaults in aliases and override them on the
command line if needed, with the patch that won't be possible anymore.

PARSE_OPT_NONEG should only be used for options where a negation doesn't
make sense, e.g. for the --stage option of checkout-index.

That's a bad bug, I don't know whether to be surprised or not that we
had no tests for this :)

I thought I was just disabling --no-no-checkout for --no-checkout, not
--checkout, but didn't notice the subtleties of the special case
handling for --no-* in parse-options.c, thanks.

I'm confused.  What's the bug here?

--no-no-checkout is undocumented; Jacob's patch addresses it. --no-checkout is the documented form. Negation allows --checkout to be used as well, with the opposite meaning to --no-checkout. Turning off negation with PARSE_OPT_NONEG forbids --checkout to be used.

Perhaps the issue is that a single line of documentation is not enough ("PARSE_OPT_NONEG: says that this option cannot be negated")?