common: support custom repository extensionsethomson/extensions

Allow users to specify additional repository extensions that they want
to support.  For example, callers can specify that they support
`preciousObjects` and then may open repositories that support
`extensions.preciousObjects`.

Similarly, callers may opt out of supporting extensions that the library
itself supports.

1 files changed, 23 insertions, 0 deletions

diff --git a/src/libgit2.c b/src/libgit2.c
index 09f7ab533..cc793b458 100644
--- a/src/libgit2.c
+++ b/src/libgit2.c
@@ -52,6 +52,7 @@ static void libgit2_settings_global_shutdown(void)
 {
 	git__free(git__user_agent);
 	git__free(git__ssl_ciphers);
+	git_repository__free_extensions();
 }
 
 static int git_libgit2_settings_global_init(void)
@@ -367,6 +368,28 @@ int git_libgit2_opts(int key, ...)
 		git_odb__loose_priority = va_arg(ap, int);
 		break;
 
+	case GIT_OPT_SET_EXTENSIONS:
+		{
+			const char **extensions = va_arg(ap, const char **);
+			size_t len = va_arg(ap, size_t);
+			error = git_repository__set_extensions(extensions, len);
+		}
+		break;
+
+	case GIT_OPT_GET_EXTENSIONS:
+		{
+			git_strarray *out = va_arg(ap, git_strarray *);
+			char **extensions;
+			size_t len;
+
+			if ((error = git_repository__extensions(&extensions, &len)) < 0)
+				break;
+
+			out->strings = extensions;
+			out->count = len;
+		}
+		break;
+
 	default:
 		git_error_set(GIT_ERROR_INVALID, "invalid option key");
 		error = -1;