Function sshConfigSplitOnCoderSection

cli/configssh.go:732–765

sshConfigSplitOnCoderSection splits the SSH config into 3 sections. All lines before sshStartToken, the coder section, and all lines after sshEndToken.

(data []byte)

// All lines before sshStartToken, the coder section, and all lines after
// sshEndToken.
func sshConfigSplitOnCoderSection(data []byte) (before, section []byte, after []byte, err error) {
	startCount := bytes.Count(data, []byte(sshStartToken))
	endCount := bytes.Count(data, []byte(sshEndToken))
	if startCount > 1 || endCount > 1 {
		return nil, nil, nil, xerrors.New("Malformed config: ssh config has multiple coder sections, please remove all but one")
	}

	startIndex := bytes.Index(data, []byte(sshStartToken))
	endIndex := bytes.Index(data, []byte(sshEndToken))
	if startIndex == -1 && endIndex != -1 {
		return nil, nil, nil, xerrors.New("Malformed config: ssh config has end header, but missing start header")
	}
	if startIndex != -1 && endIndex == -1 {
		return nil, nil, nil, xerrors.New("Malformed config: ssh config has start header, but missing end header")
	}
	if startIndex != -1 && endIndex != -1 {
		if startIndex > endIndex {
			return nil, nil, nil, xerrors.New("Malformed config: ssh config has coder section, but it is malformed and the END header is before the START header")
		}
		// We use -1 and +1 here to also include the preceding
		// and trailing newline, where applicable.
		start := startIndex
		if start > 0 {
			start--
		}
		end := endIndex + len(sshEndToken)
		if end < len(data) {
			end++
		}
		return data[:start], data[start:end], data[end:], nil
	}

	return data, nil, nil, nil
}

// sshConfigProxyCommandEscape prepares the path for use in ProxyCommand.
// It quotes the string if it contains spaces, as per