cloudflared-mirror/cmd/cloudflared/updater/update.go

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package updater
import (
"context"
"fmt"
"os"
"path/filepath"
"runtime"
"time"
"github.com/facebookgo/grace/gracenet"
"github.com/rs/zerolog"
"github.com/urfave/cli/v2"
"golang.org/x/crypto/ssh/terminal"
"github.com/cloudflare/cloudflared/config"
"github.com/cloudflare/cloudflared/logger"
)
const (
DefaultCheckUpdateFreq = time.Hour * 24
noUpdateInShellMessage = "cloudflared will not automatically update when run from the shell. To enable auto-updates, run cloudflared as a service: https://developers.cloudflare.com/cloudflare-one/connections/connect-apps/run-tunnel/as-a-service/"
noUpdateOnWindowsMessage = "cloudflared will not automatically update on Windows systems."
noUpdateManagedPackageMessage = "cloudflared will not automatically update if installed by a package manager."
isManagedInstallFile = ".installedFromPackageManager"
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UpdateURL = "https://update.argotunnel.com"
StagingUpdateURL = "https://staging-update.argotunnel.com"
LogFieldVersion = "version"
)
var (
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version string
)
// BinaryUpdated implements ExitCoder interface, the app will exit with status code 11
// https://pkg.go.dev/github.com/urfave/cli/v2?tab=doc#ExitCoder
type statusSuccess struct {
newVersion string
}
func (u *statusSuccess) Error() string {
return fmt.Sprintf("cloudflared has been updated to version %s", u.newVersion)
}
func (u *statusSuccess) ExitCode() int {
return 11
}
// UpdateErr implements ExitCoder interface, the app will exit with status code 10
type statusErr struct {
err error
}
func (e *statusErr) Error() string {
return fmt.Sprintf("failed to update cloudflared: %v", e.err)
}
func (e *statusErr) ExitCode() int {
return 10
}
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type updateOptions struct {
updateDisabled bool
isBeta bool
isStaging bool
isForced bool
intendedVersion string
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}
type UpdateOutcome struct {
Updated bool
Version string
UserMessage string
Error error
}
func (uo *UpdateOutcome) noUpdate() bool {
return uo.Error == nil && uo.Updated == false
}
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func Init(v string) {
version = v
}
func CheckForUpdate(options updateOptions) (CheckResult, error) {
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cfdPath, err := os.Executable()
if err != nil {
return nil, err
}
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url := UpdateURL
if options.isStaging {
url = StagingUpdateURL
}
s := NewWorkersService(version, url, cfdPath, Options{IsBeta: options.isBeta,
IsForced: options.isForced, RequestedVersion: options.intendedVersion})
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return s.Check()
}
func applyUpdate(options updateOptions, update CheckResult) UpdateOutcome {
if update.Version() == "" || options.updateDisabled {
return UpdateOutcome{UserMessage: update.UserMessage()}
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}
err := update.Apply()
if err != nil {
return UpdateOutcome{Error: err}
}
return UpdateOutcome{Updated: true, Version: update.Version(), UserMessage: update.UserMessage()}
}
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// Update is the handler for the update command from the command line
func Update(c *cli.Context) error {
log := logger.CreateLoggerFromContext(c, logger.EnableTerminalLog)
if wasInstalledFromPackageManager() {
log.Error().Msg("cloudflared was installed by a package manager. Please update using the same method.")
return nil
}
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isBeta := c.Bool("beta")
if isBeta {
log.Info().Msg("cloudflared is set to update to the latest beta version")
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}
isStaging := c.Bool("staging")
if isStaging {
log.Info().Msg("cloudflared is set to update from staging")
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}
isForced := c.Bool("force")
if isForced {
log.Info().Msg("cloudflared is set to upgrade to the latest publish version regardless of the current version")
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}
updateOutcome := loggedUpdate(log, updateOptions{
updateDisabled: false,
isBeta: isBeta,
isStaging: isStaging,
isForced: isForced,
intendedVersion: c.String("version"),
})
if updateOutcome.Error != nil {
return &statusErr{updateOutcome.Error}
}
if updateOutcome.noUpdate() {
log.Info().Str(LogFieldVersion, updateOutcome.Version).Msg("cloudflared is up to date")
return nil
}
return &statusSuccess{newVersion: updateOutcome.Version}
}
// Checks for an update and applies it if one is available
func loggedUpdate(log *zerolog.Logger, options updateOptions) UpdateOutcome {
checkResult, err := CheckForUpdate(options)
if err != nil {
log.Err(err).Msg("update check failed")
return UpdateOutcome{Error: err}
}
updateOutcome := applyUpdate(options, checkResult)
if updateOutcome.Updated {
log.Info().Str(LogFieldVersion, updateOutcome.Version).Msg("cloudflared has been updated")
}
if updateOutcome.Error != nil {
log.Err(updateOutcome.Error).Msg("update failed to apply")
}
return updateOutcome
}
// AutoUpdater periodically checks for new version of cloudflared.
type AutoUpdater struct {
configurable *configurable
listeners *gracenet.Net
updateConfigChan chan *configurable
log *zerolog.Logger
}
// AutoUpdaterConfigurable is the attributes of AutoUpdater that can be reconfigured during runtime
type configurable struct {
enabled bool
freq time.Duration
}
func NewAutoUpdater(updateDisabled bool, freq time.Duration, listeners *gracenet.Net, log *zerolog.Logger) *AutoUpdater {
return &AutoUpdater{
configurable: createUpdateConfig(updateDisabled, freq, log),
listeners: listeners,
updateConfigChan: make(chan *configurable),
log: log,
}
}
func createUpdateConfig(updateDisabled bool, freq time.Duration, log *zerolog.Logger) *configurable {
if isAutoupdateEnabled(log, updateDisabled, freq) {
log.Info().Dur("autoupdateFreq", freq).Msg("Autoupdate frequency is set")
return &configurable{
enabled: true,
freq: freq,
}
} else {
return &configurable{
enabled: false,
freq: DefaultCheckUpdateFreq,
}
}
}
func (a *AutoUpdater) Run(ctx context.Context) error {
ticker := time.NewTicker(a.configurable.freq)
for {
updateOutcome := loggedUpdate(a.log, updateOptions{updateDisabled: !a.configurable.enabled})
if updateOutcome.Updated {
Init(updateOutcome.Version)
if IsSysV() {
// SysV doesn't have a mechanism to keep service alive, we have to restart the process
a.log.Info().Msg("Restarting service managed by SysV...")
pid, err := a.listeners.StartProcess()
if err != nil {
a.log.Err(err).Msg("Unable to restart server automatically")
return &statusErr{err: err}
}
// stop old process after autoupdate. Otherwise we create a new process
// after each update
a.log.Info().Msgf("PID of the new process is %d", pid)
}
return &statusSuccess{newVersion: updateOutcome.Version}
} else if updateOutcome.UserMessage != "" {
a.log.Warn().Msg(updateOutcome.UserMessage)
}
select {
case <-ctx.Done():
return ctx.Err()
case newConfigurable := <-a.updateConfigChan:
ticker.Stop()
a.configurable = newConfigurable
ticker = time.NewTicker(a.configurable.freq)
// Check if there is new version of cloudflared after receiving new AutoUpdaterConfigurable
case <-ticker.C:
}
}
}
// Update is the method to pass new AutoUpdaterConfigurable to a running AutoUpdater. It is safe to be called concurrently
func (a *AutoUpdater) Update(updateDisabled bool, newFreq time.Duration) {
a.updateConfigChan <- createUpdateConfig(updateDisabled, newFreq, a.log)
}
func isAutoupdateEnabled(log *zerolog.Logger, updateDisabled bool, updateFreq time.Duration) bool {
if !supportAutoUpdate(log) {
return false
}
return !updateDisabled && updateFreq != 0
}
func supportAutoUpdate(log *zerolog.Logger) bool {
if runtime.GOOS == "windows" {
log.Info().Msg(noUpdateOnWindowsMessage)
return false
}
if wasInstalledFromPackageManager() {
log.Info().Msg(noUpdateManagedPackageMessage)
return false
}
if isRunningFromTerminal() {
log.Info().Msg(noUpdateInShellMessage)
return false
}
return true
}
func wasInstalledFromPackageManager() bool {
ok, _ := config.FileExists(filepath.Join(config.DefaultUnixConfigLocation, isManagedInstallFile))
return ok
}
func isRunningFromTerminal() bool {
return terminal.IsTerminal(int(os.Stdout.Fd()))
}
func IsSysV() bool {
if runtime.GOOS != "linux" {
return false
}
if _, err := os.Stat("/run/systemd/system"); err == nil {
return false
}
return true
}