From 785b6024cfa7e95359eb5b0fe8cfc7c8e6c4905e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Carlos=20Mart=C3=ADn=20Nieto?= <cmn@dwim.me>
Date: Sun, 18 May 2014 10:37:17 +0200
Subject: [PATCH] Add config snapshot methods

Bring the immutability to Go.
---
 config.go     | 16 ++++++++++++++++
 repository.go | 16 ++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/config.go b/config.go
index 6b1f093..0d1bbf5 100644
--- a/config.go
+++ b/config.go
@@ -354,6 +354,22 @@ func (c *Config) Refresh() error {
 	return nil
 }
 
+// Snapshot creates an immutable snapshot from the configuration. This
+// means that reads over multiple values will reflect the same version
+// of the configuration files
+func (c *Config) Snapshot() (*Config, error) {
+	config := new(Config)
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	if ret := C.git_config_snapshot(&config.ptr, c.ptr); ret < 0 {
+		return nil, MakeGitError(ret)
+	}
+
+	return config, nil
+}
+
 type ConfigIterator struct {
 	ptr *C.git_config_iterator
 }
diff --git a/repository.go b/repository.go
index 81a46b1..de4c1fa 100644
--- a/repository.go
+++ b/repository.go
@@ -87,6 +87,22 @@ func (v *Repository) Config() (*Config, error) {
 	return config, nil
 }
 
+// ConfigSnapshot returns a configuration snapshot from the
+// repository. This is the preferred form when not changing the
+// configuration.
+func (v *Repository) ConfigSnapshot() (*Config, error) {
+	config := new(Config)
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	if ret := C.git_repository_config_snapshot(&config.ptr, v.ptr); ret < 0 {
+		return nil, MakeGitError(ret)
+	}
+
+	return config, nil
+}
+
 func (v *Repository) Index() (*Index, error) {
 	var ptr *C.git_index