Implement git_repository_set_config (#735)

Closes #732

repository.go

@@ -165,6 +165,23 @@ func (v *Repository) Config() (*Config, error) {
 	return config, nil
 }
 
+// SetConfig sets the configuration file for this repository.
+//
+// This configuration file will be used for all configuration queries involving
+// this repository.
+func (v *Repository) SetConfig(c *Config) error {
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C.git_repository_set_config(v.ptr, c.ptr)
+	runtime.KeepAlive(v)
+	runtime.KeepAlive(c)
+	if ret < 0 {
+		return MakeGitError(ret)
+	}
+	return nil
+}
+
 func (v *Repository) Index() (*Index, error) {
 	var ptr *C.git_index
 

repository_test.go

@@ -40,3 +40,55 @@ func TestCreateCommitFromIds(t *testing.T) {
 		t.Errorf("mismatched commit ids, expected %v, got %v", expectedCommitId.String(), commitId.String())
 	}
 }
+
+func TestRepositorySetConfig(t *testing.T) {
+	repo := createTestRepo(t)
+	defer cleanupTestRepo(t, repo)
+
+	loc, err := time.LoadLocation("Europe/Berlin")
+	checkFatal(t, err)
+	sig := &Signature{
+		Name:  "Rand Om Hacker",
+		Email: "random@hacker.com",
+		When:  time.Date(2013, 03, 06, 14, 30, 0, 0, loc),
+	}
+
+	idx, err := repo.Index()
+	checkFatal(t, err)
+	err = idx.AddByPath("README")
+
+	treeId, err := idx.WriteTree()
+	checkFatal(t, err)
+
+	message := "This is a commit\n"
+	tree, err := repo.LookupTree(treeId)
+	checkFatal(t, err)
+	_, err = repo.CreateCommit("HEAD", sig, sig, message, tree)
+	checkFatal(t, err)
+
+	repoConfig, err := repo.Config()
+	checkFatal(t, err)
+
+	temp := Config{}
+	localConfig, err := temp.OpenLevel(repoConfig, ConfigLevelLocal)
+	checkFatal(t, err)
+	repoConfig = nil
+
+	err = repo.SetConfig(localConfig)
+	checkFatal(t, err)
+
+	configFieldName := "core.filemode"
+	err = localConfig.SetBool(configFieldName, true)
+	checkFatal(t, err)
+
+	localConfig = nil
+
+	repoConfig, err = repo.Config()
+	checkFatal(t, err)
+
+	result, err := repoConfig.LookupBool(configFieldName)
+	checkFatal(t, err)
+	if result != true {
+		t.Fatal("result must be true")
+	}
+}