allow suppressing of global and system config

The GIT_CONFIG_NOGLOBAL and GIT_CONFIG_NOSYSTEM environment
variables are magic undocumented switches that can be used
to ensure a totally clean environment. This is necessary for
running reliable tests, since those config files may contain
settings that change the outcome of tests.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin-config.c b/builtin-config.c
index e4a12e316648e6b0ab1ee0b424773f3c672c751e..404bb449aec1e24012b390b1d76f05d4cc9c74af 100644 (file)
--- a/builtin-config.c
+++ b/builtin-config.c
@@ -79,9 +79,10 @@ static int get_value(const char* key_, const char* regex_)
                local = getenv(CONFIG_LOCAL_ENVIRONMENT);
                if (!local)
                        local = repo_config = xstrdup(git_path("config"));
-               if (home)
+               if (git_config_global() && home)
                        global = xstrdup(mkpath("%s/.gitconfig", home));
-               system_wide = git_etc_gitconfig();
+               if (git_config_system())
+                       system_wide = git_etc_gitconfig();
        }
 
        key = xstrdup(key_);

diff --git a/cache.h b/cache.h
index 549f4bbac7242714283e58dd576460ca86015d52..af74e203b71333c47b898ce7b7a36eb6c4f1608b 100644 (file)
--- a/cache.h
+++ b/cache.h
@@ -589,6 +589,9 @@ extern int git_config_set_multivar(const char *, const char *, const char *, int
 extern int git_config_rename_section(const char *, const char *);
 extern const char *git_etc_gitconfig(void);
 extern int check_repository_format_version(const char *var, const char *value);
+extern int git_env_bool(const char *, int);
+extern int git_config_system(void);
+extern int git_config_global(void);
 
 #define MAX_GITNAME (1000)
 extern char git_default_email[MAX_GITNAME];

diff --git a/config.c b/config.c
index 498259ebefb3ba61a75aa5a5ca03d75576a501c0..2f85e9d3e3bcf2cc5ddc87223a797b833846af5b 100644 (file)
--- a/config.c
+++ b/config.c
@@ -492,6 +492,22 @@ const char *git_etc_gitconfig(void)
        return system_wide;
 }
 
+int git_env_bool(const char *k, int def)
+{
+       const char *v = getenv(k);
+       return v ? git_config_bool(k, v) : def;
+}
+
+int git_config_system(void)
+{
+       return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
+}
+
+int git_config_global(void)
+{
+       return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
+}
+
 int git_config(config_fn_t fn)
 {
        int ret = 0;
@@ -504,7 +520,7 @@ int git_config(config_fn_t fn)
         * config file otherwise. */
        filename = getenv(CONFIG_ENVIRONMENT);
        if (!filename) {
-               if (!access(git_etc_gitconfig(), R_OK))
+               if (git_config_system() && !access(git_etc_gitconfig(), R_OK))
                        ret += git_config_from_file(fn, git_etc_gitconfig());
                home = getenv("HOME");
                filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
@@ -512,7 +528,7 @@ int git_config(config_fn_t fn)
                        filename = repo_config = xstrdup(git_path("config"));
        }
 
-       if (home) {
+       if (git_config_global() && home) {
                char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
                if (!access(user_config, R_OK))
                        ret = git_config_from_file(fn, user_config);