Function updateDebianAptSourcesListBytes

clientupdate/clientupdate.go:521–554

(was []byte, dstTrack string)

}

func updateDebianAptSourcesListBytes(was []byte, dstTrack string) (newContent []byte, err error) {
	trackURLPrefix := []byte("https://pkgs.tailscale.com/" + dstTrack + "/")
	var buf bytes.Buffer
	var changes int
	bs := bufio.NewScanner(bytes.NewReader(was))
	hadCorrect := false
	commentLine := regexp.MustCompile(`^\s*\#`)
	pkgsURL := regexp.MustCompile(`\bhttps://pkgs\.tailscale\.com/(stable|unstable|release-candidate)/`)
	for bs.Scan() {
		line := bs.Bytes()
		if !commentLine.Match(line) {
			line = pkgsURL.ReplaceAllFunc(line, func(m []byte) []byte {
				if bytes.Equal(m, trackURLPrefix) {
					hadCorrect = true
				} else {
					changes++
				}
				return trackURLPrefix
			})
		}
		buf.Write(line)
		buf.WriteByte('\n')
	}
	if hadCorrect || (changes == 1 && bytes.Equal(bytes.TrimSpace(was), bytes.TrimSpace(buf.Bytes()))) {
		// Unchanged or close enough.
		return was, nil
	}
	if changes != 1 {
		// No changes, or an unexpected number of changes (what?). Bail.
		// They probably editted it by hand and we don't know what to do.
		return nil, fmt.Errorf("unexpected/unsupported %s contents", aptSourcesFile)
	}
	return buf.Bytes(), nil
}

func (up *Updater) archPackageInstalled() bool {
	err := exec.Command("pacman", "--query", "tailscale").Run()