From c8466645edd1413c7efed824f5bddac457eb77f9 Mon Sep 17 00:00:00 2001 From: Tanay Abhra Date: Mon, 18 Aug 2014 03:17:57 -0700 Subject: make config --add behave correctly for empty and NULL values Currently if we have a config file like, [foo] baz bar = and we try something like, "git config --add foo.baz roll", Git will segfault. Moreover, for "git config --add foo.bar roll", it will overwrite the original value instead of appending after the existing empty value. The problem lies with the regexp used for simulating --add in `git_config_set_multivar_in_file()`, "^$", which in ideal case should not match with any string but is true for empty strings. Instead use a regexp like "a^" which can not be true for any string, empty or not. For removing the segfault add a check for NULL values in `matches()` in config.c. Signed-off-by: Tanay Abhra Signed-off-by: Junio C Hamano diff --git a/builtin/config.c b/builtin/config.c index 5677c94..8224699 100644 --- a/builtin/config.c +++ b/builtin/config.c @@ -599,7 +599,7 @@ int cmd_config(int argc, const char **argv, const char *prefix) check_argc(argc, 2, 2); value = normalize_value(argv[0], argv[1]); return git_config_set_multivar_in_file(given_config_source.file, - argv[0], value, "^$", 0); + argv[0], value, "a^", 0); } else if (actions == ACTION_REPLACE_ALL) { check_write(); diff --git a/config.c b/config.c index 2634457..ffe0104 100644 --- a/config.c +++ b/config.c @@ -1233,7 +1233,7 @@ static int matches(const char *key, const char *value) return !strcmp(key, store.key) && (store.value_regex == NULL || (store.do_not_match ^ - !regexec(store.value_regex, value, 0, NULL, 0))); + (value && !regexec(store.value_regex, value, 0, NULL, 0)))); } static int store_aux(const char *key, const char *value, void *cb) diff --git a/t/t1303-wacky-config.sh b/t/t1303-wacky-config.sh index 3a2c819..3b92083 100755 --- a/t/t1303-wacky-config.sh +++ b/t/t1303-wacky-config.sh @@ -111,4 +111,24 @@ test_expect_success 'unset many entries' ' test_must_fail git config section.key ' +test_expect_success '--add appends new value after existing empty value' ' + cat >expect <<-\EOF && + + + fool + roll + EOF + cp .git/config .git/config.old && + test_when_finished "mv .git/config.old .git/config" && + cat >.git/config <<-\EOF && + [foo] + baz + baz = + baz = fool + EOF + git config --add foo.baz roll && + git config --get-all foo.baz >output && + test_cmp expect output +' + test_done -- cgit v0.10.2-6-g49f6 From c1063be2a3e14ac042db4fe9b9bcea8f2768886a Mon Sep 17 00:00:00 2001 From: Jeff King Date: Tue, 19 Aug 2014 02:20:00 -0400 Subject: config: avoid a funny sentinel value "a^" Introduce CONFIG_REGEX_NONE as a more explicit sentinel value to say "we do not want to replace any existing entry" and use it in the implementation of "git config --add". Signed-off-by: Jeff King Signed-off-by: Junio C Hamano diff --git a/builtin/config.c b/builtin/config.c index 8224699..bf1aa6b 100644 --- a/builtin/config.c +++ b/builtin/config.c @@ -599,7 +599,8 @@ int cmd_config(int argc, const char **argv, const char *prefix) check_argc(argc, 2, 2); value = normalize_value(argv[0], argv[1]); return git_config_set_multivar_in_file(given_config_source.file, - argv[0], value, "a^", 0); + argv[0], value, + CONFIG_REGEX_NONE, 0); } else if (actions == ACTION_REPLACE_ALL) { check_write(); diff --git a/cache.h b/cache.h index c708062..8356168 100644 --- a/cache.h +++ b/cache.h @@ -1233,6 +1233,8 @@ extern int update_server_info(int); #define CONFIG_INVALID_PATTERN 6 #define CONFIG_GENERIC_ERROR 7 +#define CONFIG_REGEX_NONE ((void *)1) + struct git_config_source { unsigned int use_stdin:1; const char *file; diff --git a/config.c b/config.c index ffe0104..2e709bf 100644 --- a/config.c +++ b/config.c @@ -1230,10 +1230,15 @@ static struct { static int matches(const char *key, const char *value) { - return !strcmp(key, store.key) && - (store.value_regex == NULL || - (store.do_not_match ^ - (value && !regexec(store.value_regex, value, 0, NULL, 0)))); + if (strcmp(key, store.key)) + return 0; /* not ours */ + if (!store.value_regex) + return 1; /* always matches */ + if (store.value_regex == CONFIG_REGEX_NONE) + return 0; /* never matches */ + + return store.do_not_match ^ + (value && !regexec(store.value_regex, value, 0, NULL, 0)); } static int store_aux(const char *key, const char *value, void *cb) @@ -1495,6 +1500,8 @@ out_free_ret_1: /* * If value==NULL, unset in (remove from) config, * if value_regex!=NULL, disregard key/value pairs where value does not match. + * if value_regex==CONFIG_REGEX_NONE, do not match any existing values + * (only add a new one) * if multi_replace==0, nothing, or only one matching key/value is replaced, * else all matching key/values (regardless how many) are removed, * before the new pair is written. @@ -1578,6 +1585,8 @@ int git_config_set_multivar_in_file(const char *config_filename, if (value_regex == NULL) store.value_regex = NULL; + else if (value_regex == CONFIG_REGEX_NONE) + store.value_regex = CONFIG_REGEX_NONE; else { if (value_regex[0] == '!') { store.do_not_match = 1; @@ -1609,7 +1618,8 @@ int git_config_set_multivar_in_file(const char *config_filename, if (git_config_from_file(store_aux, config_filename, NULL)) { error("invalid config file %s", config_filename); free(store.key); - if (store.value_regex != NULL) { + if (store.value_regex != NULL && + store.value_regex != CONFIG_REGEX_NONE) { regfree(store.value_regex); free(store.value_regex); } @@ -1618,7 +1628,8 @@ int git_config_set_multivar_in_file(const char *config_filename, } free(store.key); - if (store.value_regex != NULL) { + if (store.value_regex != NULL && + store.value_regex != CONFIG_REGEX_NONE) { regfree(store.value_regex); free(store.value_regex); } -- cgit v0.10.2-6-g49f6