caddyserver/caddy · error

reading input file: %v

Error message

reading input file: %v

What it means

Error "reading input file: %v" thrown in caddyserver/caddy.

Source

Thrown at cmd/commandfuncs.go:594

			fmt.Errorf("adapter name is required (use --adapt flag or leave unspecified for default)")
	}

	cfgAdapter := caddyconfig.GetAdapter(adapterFlag)
	if cfgAdapter == nil {
		return caddy.ExitCodeFailedStartup,
			fmt.Errorf("unrecognized config adapter: %s", adapterFlag)
	}

	var input []byte
	// read from stdin if the file name is "-"
	if configFlag == "-" {
		input, err = io.ReadAll(os.Stdin)
	} else {
		input, err = os.ReadFile(configFlag)
	}
	if err != nil {
		return caddy.ExitCodeFailedStartup,
			fmt.Errorf("reading input file: %v", err)
	}

	opts := map[string]any{"filename": configFlag}

	adaptedConfig, warnings, err := cfgAdapter.Adapt(input, opts)
	if err != nil {
		return caddy.ExitCodeFailedStartup, err
	}

	if prettyFlag {
		var prettyBuf bytes.Buffer
		err = json.Indent(&prettyBuf, adaptedConfig, "", "\t")
		if err != nil {
			return caddy.ExitCodeFailedStartup, err
		}
		adaptedConfig = prettyBuf.Bytes()
	}

View on GitHub (pinned to 50e54ee279)

Solutions

1. Check that the input file exists and is readable, then verify the path passed to the command.

When it happens

Trigger: Thrown at cmd/commandfuncs.go:594 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of caddyserver/caddy@50e54ee279 (2026-08-15). Data as JSON: /api/errors/798d1b28d96b7d0a. Report an issue: GitHub.