Convert local file: URLs to paths before handing over to git_clone.

Fixes a bug where a locally-cloned remote would get a `file:` URL as it's origin URL, making the push machinery shrivel in fear.

Author: tiennou

Classes/GTRepository.m

@@ -218,8 +218,14 @@ + (id)cloneFromURL:(NSURL *)originURL toWorkingDirectory:(NSURL *)workdirURL opt
 	cloneOptions.remote_callbacks.transfer_progress = transferProgressCallback;
 	cloneOptions.remote_callbacks.payload = &payload;
 
-	const char *remoteURL = originURL.absoluteString.UTF8String;
-	const char *workingDirectoryPath = workdirURL.path.UTF8String;
+	// If our originURL is local, convert to a path before handing down.
+	const char *remoteURL = NULL;
+	if (originURL.isFileURL || originURL.isFileReferenceURL) {
+		remoteURL = originURL.filePathURL.path.fileSystemRepresentation;
+	} else {
+		remoteURL = originURL.absoluteString.UTF8String;
+	}
+	const char *workingDirectoryPath = workdirURL.path.fileSystemRepresentation;
 	git_repository *repository;
 	int gitError = git_clone(&repository, remoteURL, workingDirectoryPath, &cloneOptions);
 	if (gitError < GIT_OK) {