Add fall-back support to the configuration

If a config has several files, we need to check all of them before we
can say that a variable doesn't exist.

Signed-off-by: Carlos Martín Nieto <cmn@elego.de>

src/config.c

@@ -310,13 +310,19 @@ int git_config_get_string(git_config *cfg, const char *name, const char **out)
 {
 	file_internal *internal;
 	git_config_file *file;
+	int i, error;
 
 	if (cfg->files.length == 0)
 		return git__throw(GIT_EINVALIDARGS, "Cannot get variable value; no files open in the `git_config` instance");
 
-	internal = git_vector_get(&cfg->files, 0);
-	file = internal->file;
+	for (i = 0; i < cfg->files.length; ++i) {
+		internal = git_vector_get(&cfg->files, i);
+		file = internal->file;
+		error = file->get(file, name, out);
+		if (error == GIT_SUCCESS)
+			break;
+	}
 
-	return file->get(file, name, out);
+	return error;
 }
 

tests/resources/config/.gitconfig

 [core]
 	repositoryformatversion = 5
+	something = 2
\ No newline at end of file

tests/t15-config.c

@@ -230,6 +230,26 @@ BEGIN_TEST(config10, "a repo's config overrides the global config")
 	git_repository_free(repo);
 END_TEST
 
+BEGIN_TEST(config11, "fall back to the global config")
+	git_repository *repo;
+	char home_orig[GIT_PATH_MAX];
+	char *home;
+	git_config *cfg;
+	int num;
+
+	home = getenv("HOME");
+	strcpy(home_orig, home);
+	setenv("HOME", CONFIG_BASE, 1);
+
+	must_pass(git_repository_open(&repo, REPOSITORY_FOLDER));
+	must_pass(git_repository_config(&cfg, repo));
+	setenv("HOME", home_orig, 1);
+	must_pass(git_config_get_int(cfg, "core.something", &num));
+	must_be_true(num == 2);
+	git_config_free(cfg);
+	git_repository_free(repo);
+END_TEST
+
 BEGIN_SUITE(config)
 	 ADD_TEST(config0);
 	 ADD_TEST(config1);
@@ -242,4 +262,5 @@ BEGIN_SUITE(config)
 	 ADD_TEST(config8);
 	 ADD_TEST(config9);
 	 ADD_TEST(config10);
+	 ADD_TEST(config11);
 END_SUITE