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parse-options: detect ambiguous self-negation

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Git currently does not detect the ambiguity of an option that starts
with "no" like --notes and its negated form if given just --n or --no.
All Git commands with such options have other negatable options, and
we detect the ambiguity with them, so that's currently only a potential
problem for scripts that use git rev-parse --parseopt.

Let's fix it nevertheless, as there's no need for that confusion.  To
detect the ambiguity we have to loosen the check in register_abbrev(),
as an option is considered an alias of itself.  Add non-matching
negation flags as a criterion to recognize an option being ambiguous
with its negated form.

And we need to keep going after finding a non-negated option as an
abbreviated candidate and perform the negation checks in the same
loop.

Signed-off-by: René Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
René Scharfe 2024-03-03 13:19:41 +01:00 committed by Junio C Hamano
parent cb46c3faf8
commit 0d8a3097c7
2 changed files with 12 additions and 2 deletions
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3
parse-options.c
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@ -363,7 +363,7 @@ static void register_abbrev(struct parse_opt_ctx_t *p,
if (p->flags & PARSE_OPT_KEEP_UNKNOWN_OPT)
return;
if (abbrev->option &&
!is_alias(p, abbrev->option, option)) {
!(abbrev->flags == flags && is_alias(p, abbrev->option, option))) {
/*
* If this is abbreviated, it is
* ambiguous. So when there is no
@ -406,7 +406,6 @@ static enum parse_opt_result parse_long_opt(
if (!strncmp(long_name, arg, arg_end - arg)) {
register_abbrev(p, options, flags ^ opt_flags,
&abbrev, &ambiguous);
continue;
}
/* negation allowed? */
if (options->flags & PARSE_OPT_NONEG)

11
t/t1502-rev-parse-parseopt.sh
View file

@ -322,4 +322,15 @@ check_invalid_long_option optionspec-neg --no-positive-only
check_invalid_long_option optionspec-neg --negative
check_invalid_long_option optionspec-neg --no-no-negative
test_expect_success 'ambiguous: --no matches both --noble and --no-noble' '
cat >spec <<-\EOF &&
some-command [options]
--
noble The feudal switch.
EOF
test_expect_code 129 env GIT_TEST_DISALLOW_ABBREVIATED_OPTIONS=false \
git rev-parse --parseopt -- <spec 2>err --no &&
grep "error: ambiguous option: no (could be --noble or --no-noble)" err
'
test_done