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check return value of verify_ref_format()

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Users of the ref-filter code must call verify_ref_format()
before formatting any refs, but most ignore its return
value. This means we may print an error on a syntactically
bogus pattern, but keep going anyway.

In most cases this results in a fatal error when we actually
try to format a ref. But if you have no refs to show at all,
then the behavior is confusing: git prints the error from
verify_ref_format(), then exits with code 0 without showing
any output.  Let's instead abort immediately if we know we
have a bogus format.

We'll output the usage information if we have it handy (just
like the existing call in cmd_for_each_ref() does), and
otherwise just die().

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King
2017-07-13 10:56:10 -04:00
committed by Junio C Hamano
parent 80145b1e41
commit 2eda0102be
3 changed files with 10 additions and 5 deletions
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7
builtin/tag.c
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@ -53,7 +53,8 @@ static int list_tags(struct ref_filter *filter, struct ref_sorting *sorting, con
format = "%(refname:lstrip=2)";
}
verify_ref_format(format);
if (verify_ref_format(format))
die(_("unable to parse format string"));
filter->with_commit_tag_algo = 1;
filter_refs(&array, filter, FILTER_REFS_TAGS);
ref_array_sort(sorting, &array);
@ -501,8 +502,8 @@ int cmd_tag(int argc, const char **argv, const char *prefix)
if (cmdmode == 'd')
return for_each_tag_name(argv, delete_tag, NULL);
if (cmdmode == 'v') {
if (format)
verify_ref_format(format);
if (format && verify_ref_format(format))
usage_with_options(git_tag_usage, options);
return for_each_tag_name(argv, verify_tag, format);
}