docker/cli · error

invalid host: %w

Error message

invalid host: %w

What it means

Error "invalid host: %w" thrown in docker/cli.

Source

Thrown at cli/connhelper/ssh/ssh.go:131

		}
		args = append(args, "-l", usr)
	}
	if sp.Port != "" {
		// Quote port, as it's obtained from the URL.
		port, err := syntax.Quote(sp.Port, syntax.LangPOSIX)
		if err != nil {
			return nil, fmt.Errorf("invalid port: %w", err)
		}
		args = append(args, "-p", port)
	}

	// We consider "sshFlags" to be "trusted", and set from code only,
	// as they are not parsed from the DOCKER_HOST URL.
	args = append(args, sshFlags...)

	host, err := syntax.Quote(sp.Host, syntax.LangPOSIX)
	if err != nil {
		return nil, fmt.Errorf("invalid host: %w", err)
	}

	return append(args, "--", host), nil
}

// Command returns the ssh flags and arguments to execute a command
// (remoteCommandAndArgs) on the remote host. Where needed, it quotes
// values passed in remoteCommandAndArgs to account for ssh executing
// the remote command in a shell. It returns an error if no remote command
// is passed, or when unable to quote the remote command.
//
// Important: to preserve backward-compatibility, Command does not currently
// perform sanitization or quoting on the sshFlags and callers are expected
// to sanitize this argument.
func (sp *Spec) Command(sshFlags []string, remoteCommandAndArgs ...string) ([]string, error) {
	if len(remoteCommandAndArgs) == 0 {
		return nil, errors.New("no remote command specified")
	}

View on GitHub (pinned to e9452d6e78)

When it happens

Trigger: Thrown at cli/connhelper/ssh/ssh.go:131 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of docker/cli@e9452d6e78 (2026-08-01). Data as JSON: /data/errors/05b76519580ea761.json. Report an issue: GitHub.