From 00160242770aea137ec7154a8e8406feef733926 Mon Sep 17 00:00:00 2001 From: Jeff King Date: Sun, 8 Sep 2013 04:40:02 -0400 Subject: [PATCH] git-config: always treat --int as 64-bit internally When you run "git config --int", the maximum size of integer you get depends on how git was compiled, and what it considers to be an "int". This is almost useful, because your scripts calling "git config" will behave similarly to git internally. But relying on this is dubious; you have to actually know how git treats each value internally (e.g., int versus unsigned long), which is not documented and is subject to change. And even if you know it is "unsigned long", we do not have a git-config option to match that behavior. Furthermore, you may simply be asking git to store a value on your behalf (e.g., configuration for a hook). In that case, the relevant range check has nothing at all to do with git, but rather with whatever scripting tools you are using (and git has no way of knowing what the appropriate range is there). Not only is the range check useless, but it is actively harmful, as there is no way at all for scripts to look at config variables with large values. For instance, one cannot reliably get the value of pack.packSizeLimit via git-config. On an LP64 system, git happily uses a 64-bit "unsigned long" internally to represent the value, but the script cannot read any value over 2G. Ideally, the "--int" option would simply represent an arbitrarily large integer. For practical purposes, however, a 64-bit integer is large enough, and is much easier to implement (and if somebody overflows it, we will still notice the problem, and not simply return garbage). Signed-off-by: Jeff King Signed-off-by: Junio C Hamano --- builtin/config.c | 7 ++++--- cache.h | 1 + config.c | 17 +++++++++++++++++ t/t1300-repo-config.sh | 7 +++++++ 4 files changed, 29 insertions(+), 3 deletions(-) diff --git a/builtin/config.c b/builtin/config.c index 4010c4320a..8b182d2a9f 100644 --- a/builtin/config.c +++ b/builtin/config.c @@ -128,7 +128,8 @@ static int collect_config(const char *key_, const char *value_, void *cb) must_print_delim = 1; } if (types == TYPE_INT) - sprintf(value, "%d", git_config_int(key_, value_?value_:"")); + sprintf(value, "%"PRId64, + git_config_int64(key_, value_ ? value_ : "")); else if (types == TYPE_BOOL) vptr = git_config_bool(key_, value_) ? "true" : "false"; else if (types == TYPE_BOOL_OR_INT) { @@ -265,8 +266,8 @@ static char *normalize_value(const char *key, const char *value) else { normalized = xmalloc(64); if (types == TYPE_INT) { - int v = git_config_int(key, value); - sprintf(normalized, "%d", v); + int64_t v = git_config_int64(key, value); + sprintf(normalized, "%"PRId64, v); } else if (types == TYPE_BOOL) sprintf(normalized, "%s", diff --git a/cache.h b/cache.h index 85b544f38d..ac4525aabb 100644 --- a/cache.h +++ b/cache.h @@ -1190,6 +1190,7 @@ extern int git_config_with_options(config_fn_t fn, void *, extern int git_config_early(config_fn_t fn, void *, const char *repo_config); extern int git_parse_ulong(const char *, unsigned long *); extern int git_config_int(const char *, const char *); +extern int64_t git_config_int64(const char *, const char *); extern unsigned long git_config_ulong(const char *, const char *); extern int git_config_bool_or_int(const char *, const char *, int *); extern int git_config_bool(const char *, const char *); diff --git a/config.c b/config.c index 4be6c7ba2b..3ffe134c57 100644 --- a/config.c +++ b/config.c @@ -534,6 +534,15 @@ static int git_parse_int(const char *value, int *ret) return 1; } +static int git_parse_int64(const char *value, int64_t *ret) +{ + intmax_t tmp; + if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int64_t))) + return 0; + *ret = tmp; + return 1; +} + int git_parse_ulong(const char *value, unsigned long *ret) { uintmax_t tmp; @@ -565,6 +574,14 @@ int git_config_int(const char *name, const char *value) return ret; } +int64_t git_config_int64(const char *name, const char *value) +{ + int64_t ret; + if (!git_parse_int64(value, &ret)) + die_bad_number(name, value); + return ret; +} + unsigned long git_config_ulong(const char *name, const char *value) { unsigned long ret; diff --git a/t/t1300-repo-config.sh b/t/t1300-repo-config.sh index 20aee6e171..b66c632621 100755 --- a/t/t1300-repo-config.sh +++ b/t/t1300-repo-config.sh @@ -652,6 +652,13 @@ test_expect_success numbers ' test_cmp expect actual ' +test_expect_success '--int is at least 64 bits' ' + git config giga.watts 121g && + echo 129922760704 >expect && + git config --int --get giga.watts >actual && + test_cmp expect actual +' + test_expect_success 'invalid unit' ' git config aninvalid.unit "1auto" && echo 1auto >expect && -- 2.11.4.GIT