dmd_cap_file = os.path.join(options["node-directory"], u"private", u"magic_folder_dircap")
collective_readcap_file = os.path.join(options["node-directory"], u"private", u"collective_dircap")
+ if os.path.exists(dmd_cap_file) or os.path.exists(collective_readcap_file):
+ raise usage.UsageError("Cannot join. Already joined.")
+
fileutil.write(dmd_cap_file, dmd_write_cap)
fileutil.write(collective_readcap_file, magic_readonly_cap)