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From: Stefan Beller <sbeller@google.com>
To: gitster@pobox.com
Cc: git@vger.kernel.org, Stefan Beller <sbeller@google.com>
Subject: [PATCH 2/3] config: fix case sensitive subsection names on writing
Date: Wed,  8 Aug 2018 12:50:19 -0700
Message-ID: <20180808195020.37374-3-sbeller@google.com> (raw)
In-Reply-To: <20180808195020.37374-1-sbeller@google.com>

A user reported a submodule issue regarding a section mix-up,
but it could be boiled down to the following test case:

  $ git init test  && cd test
  $ git config foo."Bar".key test
  $ git config foo."bar".key test
  $ tail -n 3 .git/config
  [foo "Bar"]
        key = test
        key = test

Sub sections are case sensitive and we have a test for correctly reading
them. However we do not have a test for writing out config correctly with
case sensitive subsection names, which is why this went unnoticed in
6ae996f2acf (git_config_set: make use of the config parser's event
stream, 2018-04-09)

Unfortunately we have to make a distinction between old style configuration
that looks like

  [foo.Bar]
        key = test

and the new quoted style as seen above. The old style is documented as
case-agnostic, hence we need to keep 'strncasecmp'; although the
resulting setting for the old style config differs from the configuration.
That will be fixed in a follow up patch.

Reported-by: JP Sugarbroad <jpsugar@google.com>
Signed-off-by: Stefan Beller <sbeller@google.com>
---
 config.c          | 12 +++++++++++-
 t/t1300-config.sh |  1 +
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/config.c b/config.c
index 02050529788..27e800c7ce8 100644
--- a/config.c
+++ b/config.c
@@ -35,6 +35,7 @@ struct config_source {
 	int eof;
 	struct strbuf value;
 	struct strbuf var;
+	unsigned subsection_case_sensitive : 1;
 
 	int (*do_fgetc)(struct config_source *c);
 	int (*do_ungetc)(int c, struct config_source *conf);
@@ -603,6 +604,7 @@ static int get_value(config_fn_t fn, void *data, struct strbuf *name)
 
 static int get_extended_base_var(struct strbuf *name, int c)
 {
+	cf->subsection_case_sensitive = 0;
 	do {
 		if (c == '\n')
 			goto error_incomplete_line;
@@ -639,6 +641,7 @@ static int get_extended_base_var(struct strbuf *name, int c)
 
 static int get_base_var(struct strbuf *name)
 {
+	cf->subsection_case_sensitive = 1;
 	for (;;) {
 		int c = get_next_char();
 		if (cf->eof)
@@ -2328,14 +2331,21 @@ static int store_aux_event(enum config_event_t type,
 	store->parsed[store->parsed_nr].type = type;
 
 	if (type == CONFIG_EVENT_SECTION) {
+		int (*cmpfn)(const char *, const char *, size_t);
+
 		if (cf->var.len < 2 || cf->var.buf[cf->var.len - 1] != '.')
 			return error("invalid section name '%s'", cf->var.buf);
 
+		if (cf->subsection_case_sensitive)
+			cmpfn = strncasecmp;
+		else
+			cmpfn = strncmp;
+
 		/* Is this the section we were looking for? */
 		store->is_keys_section =
 			store->parsed[store->parsed_nr].is_keys_section =
 			cf->var.len - 1 == store->baselen &&
-			!strncasecmp(cf->var.buf, store->key, store->baselen);
+			!cmpfn(cf->var.buf, store->key, store->baselen);
 		if (store->is_keys_section) {
 			store->section_seen = 1;
 			ALLOC_GROW(store->seen, store->seen_nr + 1,
diff --git a/t/t1300-config.sh b/t/t1300-config.sh
index c15c19bf78d..77c5899d000 100755
--- a/t/t1300-config.sh
+++ b/t/t1300-config.sh
@@ -1260,6 +1260,7 @@ test_expect_success 'setting different case sensitive subsections ' '
 		Qc = v2
 		[d "e"]
 		f = v1
+		[d "E"]
 		Qf = v2
 	EOF
 	# exact match
-- 
2.18.0.597.ga71716f1ad-goog


  parent reply index

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-08 19:50 [PATCH 0/3] Resending sb/config-write-fix Stefan Beller
2018-08-08 19:50 ` [PATCH 1/3] t1300: document current behavior of setting options Stefan Beller
2018-08-08 19:50 ` Stefan Beller [this message]
2018-08-08 19:50 ` [PATCH 3/3] git-config: document accidental multi-line setting in deprecated syntax Stefan Beller
2018-08-08 20:28 ` [PATCH 0/3] Resending sb/config-write-fix Junio C Hamano
  -- strict thread matches above, loose matches on Subject: below --
2018-07-31 15:16 [PATCH 0/3] config: fix case sensitive subsection names on writing Junio C Hamano
2018-08-01 19:34 ` [PATCH 0/3] sb/config-write-fix done without robbing Peter Stefan Beller
2018-08-01 19:34   ` [PATCH 2/3] config: fix case sensitive subsection names on writing Stefan Beller
2018-08-01 21:01     ` Ramsay Jones
2018-08-01 22:26       ` Junio C Hamano
2018-08-01 22:51     ` Junio C Hamano
2018-08-03  0:30       ` Stefan Beller
2018-08-03 15:51         ` Junio C Hamano
2018-08-03  0:34   ` [PATCH 0/3] Reroll of sb/config-write-fix Stefan Beller
2018-08-03  0:34     ` [PATCH 2/3] config: fix case sensitive subsection names on writing Stefan Beller
2018-07-30 12:49 [PATCH] " Johannes Schindelin
2018-07-30 23:04 ` [PATCH 0/3] " Stefan Beller
2018-07-30 23:04   ` [PATCH 2/3] " Stefan Beller
2018-07-31 20:16     ` Junio C Hamano

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