API to set a dangling remote's repository

include/git2/remote.h

@@ -52,6 +52,16 @@ typedef int (*git_remote_rename_problem_cb)(const char *problematic_refspec, voi
 GIT_EXTERN(int) git_remote_new(git_remote **out, git_repository *repo, const char *name, const char *url, const char *fetch);
 
 /**
+ * Sets the owning repository for the remote.  This is only allowed on
+ * dangling remotes.
+ *
+ * @param remote the remote to configure
+ * @param repo the repository that will own the remote
+ * @return 0 or an error code
+ */
+GIT_EXTERN(int) git_remote_set_repository(git_remote *remote, git_repository *repo);
+
+/**
  * Get the information for a particular remote
  *
  * The name will be checked for validity.

src/remote.c

@@ -132,6 +132,19 @@ on_error:
 	return -1;
 }
 
+int git_remote_set_repository(git_remote *remote, git_repository *repo)
+{
+	assert(repo);
+
+	if (remote->repo) {
+		giterr_set(GITERR_INVALID, "Remotes can't change repositiories.");
+		return GIT_ERROR;
+	}
+
+	remote->repo = repo;
+	return 0;
+}
+
 int git_remote_load(git_remote **out, git_repository *repo, const char *name)
 {
 	git_remote *remote;

tests-clar/network/remotes.c

@@ -330,9 +330,13 @@ void test_network_remotes__check_structure_version(void)
 void test_network_remotes__dangling(void)
 {
 	cl_git_pass(git_remote_new(&_remote, NULL, "upstream", "git://github.com/libgit2/libgit2", NULL));
-	cl_git_fail(git_remote_save(_remote));
-	cl_git_fail(git_remote_update_tips(_remote));
 
 	cl_git_pass(git_remote_rename(_remote, "newname", NULL, NULL));
 	cl_assert_equal_s(git_remote_name(_remote), "newname");
+
+	cl_git_fail(git_remote_save(_remote));
+	cl_git_fail(git_remote_update_tips(_remote));
+
+	cl_git_pass(git_remote_set_repository(_remote, _repo));
+	cl_git_pass(git_remote_save(_remote));
 }