go-delve/delve · error

too many arguments to "config substitutePath"

Error message

too many arguments to "config substitutePath"

What it means

The DAP `config substitutePath` setting accepts at most a pair `<client path> <server path>` (plus special forms like -clear or a single removal entry). configureSetSubstitutePath returns this error when the argument vector has more tokens than the allowed forms.

Source

Thrown at service/dap/config.go:94

				copy(args.substitutePathServerToClient[i:], args.substitutePathServerToClient[i+1:])
				args.substitutePathServerToClient = args.substitutePathServerToClient[:len(args.substitutePathServerToClient)-1]
				return nil
			}
		}
		return fmt.Errorf("could not find rule for %q", argv[0])
	case 2: // add substitute-path rule
		for i := range args.substitutePathClientToServer {
			if args.substitutePathClientToServer[i][0] == argv[0] {
				args.substitutePathClientToServer[i][1] = argv[1]
				args.substitutePathServerToClient[i][0] = argv[1]
				return nil
			}
		}
		args.substitutePathClientToServer = append(args.substitutePathClientToServer, [2]string{argv[0], argv[1]})
		args.substitutePathServerToClient = append(args.substitutePathServerToClient, [2]string{argv[1], argv[0]})

	default:
		return errors.New("too many arguments to \"config substitutePath\"")
	}
	return nil
}

func configureSetShowPprofLabels(args *launchAttachArgs, rest string) error {
	if strings.TrimSpace(rest) == "-clear" {
		args.ShowPprofLabels = args.ShowPprofLabels[:0]
		return nil
	}
	delete := false
	argv := config.SplitQuotedFields(rest, '"')
	if len(argv) == 2 && argv[0] == "-clear" {
		argv = argv[1:]
		delete = true
	}
	switch len(argv) {
	case 0:
		// do nothing, let caller show the current list of labels

View on GitHub (pinned to a23773e6c3)

Solutions

1. Quote paths containing spaces so they parse as one token
2. Submit one mapping per command invocation
3. Use `config substitutePath -clear` or the removal form instead of listing many pairs at once

Example fix

// before
config substitutePath=/home/me/My Project /srv/app
// after
config substitutePath="/home/me/My Project" /srv/app

argv := strings.Fields(rest)
if len(argv) > 2 && !strings.HasPrefix(rest, "-clear") {
	// quote paths with spaces or split into multiple commands
}

When it happens

Trigger: `config substitutePath=<a> <b> <c>` — three or more space-separated tokens; also paths containing unquoted spaces that split into extra argv entries.

Common situations: Windows or macOS paths with spaces (e.g. `/Users/me/My Projects/...`) submitted unquoted; users pasting multiple mappings on one line; VS Code launch configs with mappings containing spaces flattened into the REPL.

Related errors

• too many arguments to "config showPprofLabels"
• could not find rule for %q
• unknown config parameter
• not documented
• wrong number of arguments to "config"

AI-assisted analysis of go-delve/delve@a23773e6c3 (2026-08-31). Data as JSON: /api/errors/37eca214611cc8c6. Report an issue: GitHub.