config: implement basic transactional support

When a configuration file is locked, any updates made to it will be done
to the in-memory copy of the file. This allows for multiple updates to
happen while we hold the lock, preventing races during complex
config-file manipulation.

1 files changed, 10 insertions, 0 deletions

diff --git a/src/config_file.h b/src/config_file.h
index 0d8bf740f..1c52892c3 100644
--- a/src/config_file.h
+++ b/src/config_file.h
@@ -55,6 +55,16 @@ GIT_INLINE(int) git_config_file_foreach_match(
 	return git_config_backend_foreach_match(cfg, regexp, fn, data);
 }
 
+GIT_INLINE(int) git_config_file_lock(git_config_backend *cfg)
+{
+	return cfg->lock(cfg);
+}
+
+GIT_INLINE(int) git_config_file_unlock(git_config_backend *cfg, int success)
+{
+	return cfg->unlock(cfg, success);
+}
+
 extern int git_config_file_normalize_section(char *start, char *end);
 
 #endif