         try Process.checkNonZeroExit(
             args: Git.tool, "-C", path.asString, "submodule", "update", "--init", "--recursive")
         try Process.checkNonZeroExit(
-            args: Git.tool, "-C", path.asString, "clean", "-ffd")
+            args: Git.tool, "-C", path.asString, "clean", "-ffdx")
     }
 
     /// Returns true if a revision exists.

        // FIXME: We need infrastructure in this subsystem for reporting
        // status information.

        let process = Process(args: Git.tool, "clone", "--bare", repository.url, path.asString)
        // Add to process set.
        try processSet?.add(process)
        // Launch the process.

    public func fetch() throws {
        try queue.sync {
            try Process.checkNonZeroExit(
                args: Git.tool, "-C", path.asString, "remote", "update", "-p")
            self.tagsCache = nil
        }
    }
