Re: [PATCH] config: preserve <subsection> case for one-shot config on the command line

> On 20 Feb 2017, at 10:58, Junio C Hamano <gitster@pobox.com> wrote:
> 
> Junio C Hamano <gitster@pobox.com> writes:
> 
>> I still haven't queued any of the variants I posted (and I do not
>> think other people sent their own versions, either).  I need to pick
>> one and queue, with a test or two.  Perhaps after -rc2.  
>> 
>> Others are welcome to work on it while I cut -rc2 tomorrow, so that
>> by the time I see their patch all that is left for me to do is to
>> apply it ;-)
> 
> Since nothing seems to have happened in the meantime, here is what
> I'll queue so that we won't forget for now.  Lars's tests based on
> how the scripted "git submodule" uses "git config" may still be
> valid, but it is somewhat a roundabout way to demonstrate the
> breakage and not very effective way to protect the fix, so I added a
> new test that directly tests "git -c <var>=<val> <command>".

> ...
> 
> +/*
> + * downcase the <section> and <variable> in <section>.<variable> or
> + * <section>.<subsection>.<variable> and do so in place.  <subsection>
> + * is left intact.
> + */
> +static void canonicalize_config_variable_name(char *varname)
> +{
> +	char *cp, *last_dot;

> +
> +	/* downcase the first segment */
> +	for (cp = varname; *cp; cp++) {
> +		if (*cp == '.')
> +			break;
> +		*cp = tolower(*cp);
> +	}
> +	if (!*cp)
> +		return;
> +
> +	/* scan for the last dot */
> +	for (last_dot = cp; *cp; cp++)
> +		if (*cp == '.')
> +			last_dot = cp;
> +
> +	/* downcase the last segment */
> +	for (cp = last_dot; *cp; cp++)
> +		*cp = tolower(*cp);
> +}
> +
> int git_config_parse_parameter(const char *text,
> 			       config_fn_t fn, void *data)
> {
> @@ -221,7 +249,7 @@ int git_config_parse_parameter(const char *text,
> 		strbuf_list_free(pair);
> 		return error("bogus config parameter: %s", text);
> 	}
> -	strbuf_tolower(pair[0]);
> +	canonicalize_config_variable_name(pair[0]->buf);
> 	if (fn(pair[0]->buf, value, data) < 0) {
> 		strbuf_list_free(pair);
> 		return -1;
> diff --git a/t/t1351-config-cmdline.sh b/t/t1351-config-cmdline.sh
> new file mode 100755
> index 0000000000..acb8dc3b15
> --- /dev/null
> +++ b/t/t1351-config-cmdline.sh
> @@ -0,0 +1,48 @@
> +#!/bin/sh
> +
> +test_description='git -c var=val'
> +
> +. ./test-lib.sh
> +
> +test_expect_success 'last one wins: two level vars' '
> +	echo VAL >expect &&
> +
> +	# sec.var and sec.VAR are the same variable, as the first
> +	# and the last level of a configuration variable name is
> +	# case insensitive.  Test both setting and querying.
> +
> +	git -c sec.var=val -c sec.VAR=VAL config --get sec.var >actual &&
> +	test_cmp expect actual &&
> +	git -c SEC.var=val -c sec.var=VAL config --get sec.var >actual &&
> +	test_cmp expect actual &&
> +
> +	git -c sec.var=val -c sec.VAR=VAL config --get SEC.var >actual &&
> +	test_cmp expect actual &&
> +	git -c SEC.var=val -c sec.var=VAL config --get sec.VAR >actual &&
> +	test_cmp expect actual
> +'
> +
> +test_expect_success 'last one wins: three level vars' '
> +	echo val >expect &&
> +
> +	# v.a.r and v.A.r are not the same variable, as the middle
> +	# level of a three-level configuration variable name is
> +	# case sensitive.  Test both setting and querying.
> +
> +	git -c v.a.r=val -c v.A.r=VAL config --get v.a.r >actual &&
> +	test_cmp expect actual &&
> +	git -c v.a.r=val -c v.A.r=VAL config --get V.a.R >actual &&
> +	test_cmp expect actual &&
> +
> +	echo VAL >expect &&
> +	git -c v.a.r=val -c v.a.R=VAL config --get v.a.r >actual &&
> +	test_cmp expect actual &&
> +	git -c v.a.r=val -c V.a.r=VAL config --get v.a.r >actual &&
> +	test_cmp expect actual &&
> +	git -c v.a.r=val -c v.a.R=VAL config --get V.a.R >actual &&
> +	test_cmp expect actual &&
> +	git -c v.a.r=val -c V.a.r=VAL config --get V.a.R >actual &&
> +	test_cmp expect actual
> +'
> +
> +test_done
> -- 
> 2.12.0-rc2-221-g8fa194a99f
>