func compatCheck(client controller.Client, minVersion string) (bool, error) {
status, err := client.Status()
if err != nil {
return false, err
}
v := version.Parse(status.Version)
return v.Dev || !v.Before(version.Parse(minVersion)), nil
}
func run() error {
log := log15.New()
if *isTTY {
log.SetHandler(log15.StreamHandler(colorable.NewColorableStdout(), log15.TerminalFormat()))
}
var images map[string]*ct.Artifact
if err := json.NewDecoder(os.Stdin).Decode(&images); err != nil {
log.Error("error decoding images", "err", err)
return err
}
req, err := http.NewRequest("GET", "http://status-web.discoverd", nil)
if err != nil {
return err
}
req.Header = make(http.Header)
req.Header.Set("Accept", "application/json")
res, err := http.DefaultClient.Do(req)
if err != nil {
log.Error("error getting cluster status", "err", err)
return err
}
defer res.Body.Close()
if res.StatusCode != 200 {
log.Error("cluster status is unhealthy", "code", res.StatusCode)
return fmt.Errorf("cluster is unhealthy")
}
var statusWrapper struct {
Data struct {
Detail map[string]status.Status
}
}
if err := json.NewDecoder(res.Body).Decode(&statusWrapper); err != nil {
log.Error("error decoding cluster status JSON", "err", err)
return err
}
statuses := statusWrapper.Data.Detail
instances, err := discoverd.GetInstances("controller", 10*time.Second)
if err != nil {
log.Error("error looking up controller in service discovery", "err", err)
return err
}
client, err := controller.NewClient("", instances[0].Meta["AUTH_KEY"])
if err != nil {
log.Error("error creating controller client", "err", err)
return err
}
log.Info("validating images")
for _, app := range updater.SystemApps {
if v := version.Parse(statuses[app.Name].Version); !v.Dev && app.MinVersion != "" && v.Before(version.Parse(app.MinVersion)) {
log.Info(
"not updating image of system app, can't upgrade from running version",
"app", app.Name,
"version", v,
)
continue
}
if _, ok := images[app.Name]; !ok {
err := fmt.Errorf("missing image: %s", app.Name)
log.Error(err.Error())
return err
}
}
log.Info("creating new image artifacts")
redisImage = images["redis"]
if err := client.CreateArtifact(redisImage); err != nil {
log.Error("error creating redis image artifact", "err", err)
return err
}
slugRunner = images["slugrunner"]
if err := client.CreateArtifact(slugRunner); err != nil {
log.Error("error creating slugrunner image artifact", "err", err)
return err
}
slugBuilder = images["slugbuilder"]
if err := client.CreateArtifact(slugBuilder); err != nil {
log.Error("error creating slugbuilder image artifact", "err", err)
return err
}
// deploy system apps in order first
for _, appInfo := range updater.SystemApps {
if appInfo.ImageOnly {
continue // skip ImageOnly updates
}
log := log.New("name", appInfo.Name)
log.Info("starting deploy of system app")
app, err := client.GetApp(appInfo.Name)
if err == controller.ErrNotFound && appInfo.Optional {
log.Info(
"skipped deploy of system app",
"reason", "optional app not present",
"app", appInfo.Name,
)
continue
} else if err != nil {
log.Error("error getting app", "err", err)
return err
}
if err := deployApp(client, app, images[appInfo.Name], appInfo.UpdateRelease, log); err != nil {
if e, ok := err.(errDeploySkipped); ok {
log.Info(
"skipped deploy of system app",
"reason", e.reason,
"app", appInfo.Name,
)
continue
}
return err
}
log.Info("finished deploy of system app")
}
// deploy all other apps (including provisioned Redis apps)
apps, err := client.AppList()
if err != nil {
log.Error("error getting apps", "err", err)
return err
}
for _, app := range apps {
log := log.New("name", app.Name)
if app.RedisAppliance() {
log.Info("starting deploy of Redis app")
if err := deployApp(client, app, redisImage, nil, log); err != nil {
if e, ok := err.(errDeploySkipped); ok {
log.Info("skipped deploy of Redis app", "reason", e.reason)
continue
}
return err
}
log.Info("finished deploy of Redis app")
continue
}
if app.System() {
continue
}
log.Info("starting deploy of app to update slugrunner")
if err := deployApp(client, app, slugRunner, nil, log); err != nil {
if e, ok := err.(errDeploySkipped); ok {
log.Info("skipped deploy of app", "reason", e.reason)
continue
}
return err
}
log.Info("finished deploy of app")
}
return nil
}
func runUpdate(args *docopt.Args) error {
log := log15.New()
// create and update a TUF client
log.Info("initializing TUF client")
local, err := tuf.FileLocalStore(args.String["--tuf-db"])
if err != nil {
log.Error("error creating local TUF client", "err", err)
return err
}
remote, err := tuf.HTTPRemoteStore(args.String["--repository"], tufHTTPOpts("updater"))
if err != nil {
log.Error("error creating remote TUF client", "err", err)
return err
}
client := tuf.NewClient(local, remote)
if !args.Bool["--is-latest"] {
return updateAndExecLatest(args.String["--config-dir"], client, log)
}
// unlink the current binary if it is a temp file
if args.Bool["--is-tempfile"] {
os.Remove(os.Args[0])
}
// read the TUF db so we can pass it to hosts
log.Info("reading TUF database")
tufDB, err := ioutil.ReadFile(args.String["--tuf-db"])
if err != nil {
log.Error("error reading the TUF database", "err", err)
return err
}
log.Info("getting host list")
clusterClient := cluster.NewClient()
hosts, err := clusterClient.Hosts()
if err != nil {
log.Error("error getting host list", "err", err)
return err
}
if len(hosts) == 0 {
return errors.New("no hosts found")
}
log.Info(fmt.Sprintf("updating %d hosts", len(hosts)))
// eachHost invokes the given function in a goroutine for each host,
// returning an error if any of the functions returns an error.
eachHost := func(f func(*cluster.Host, log15.Logger) error) (err error) {
errs := make(chan error)
for _, h := range hosts {
go func(host *cluster.Host) {
log := log.New("host", host.ID())
errs <- f(host, log)
}(h)
}
for range hosts {
if e := <-errs; e != nil {
err = e
}
}
return
}
log.Info("checking host version compatibility")
if err := eachHost(func(host *cluster.Host, log log15.Logger) error {
status, err := host.GetStatus()
if err != nil {
log.Error("error getting host status", "err", err)
return err
}
v := version.Parse(status.Version)
if v.Before(version.Parse(minVersion)) && !v.Dev {
log.Error(ErrIncompatibleVersion.Error(), "version", status.Version)
return ErrIncompatibleVersion
}
return nil
}); err != nil {
return err
}
var mtx sync.Mutex
images := make(map[string]string)
log.Info("pulling latest images on all hosts")
if err := eachHost(func(host *cluster.Host, log log15.Logger) error {
log.Info("pulling images")
ch := make(chan *layer.PullInfo)
stream, err := host.PullImages(
args.String["--repository"],
args.String["--driver"],
args.String["--root"],
version.String(),
bytes.NewReader(tufDB),
ch,
)
if err != nil {
log.Error("error pulling images", "err", err)
return err
}
defer stream.Close()
for info := range ch {
if info.Type == layer.TypeLayer {
continue
}
log.Info("pulled image", "name", info.Repo)
imageURI := fmt.Sprintf("%s?name=%s&id=%s", args.String["--repository"], info.Repo, info.ID)
mtx.Lock()
images[info.Repo] = imageURI
mtx.Unlock()
}
if err := stream.Err(); err != nil {
log.Error("error pulling images", "err", err)
return err
}
return nil
}); err != nil {
return err
}
var binaries map[string]string
log.Info("pulling latest binaries and config on all hosts")
if err := eachHost(func(host *cluster.Host, log log15.Logger) error {
log.Info("pulling binaries and config")
paths, err := host.PullBinariesAndConfig(
args.String["--repository"],
args.String["--bin-dir"],
args.String["--config-dir"],
version.String(),
bytes.NewReader(tufDB),
)
if err != nil {
log.Error("error pulling binaries and config", "err", err)
return err
}
mtx.Lock()
binaries = paths
mtx.Unlock()
log.Info("binaries and config pulled successfully")
return nil
}); err != nil {
return err
}
log.Info("validating binaries")
flynnHost, ok := binaries["flynn-host"]
if !ok {
return fmt.Errorf("missing flynn-host binary")
}
flynnInit, ok := binaries["flynn-init"]
if !ok {
return fmt.Errorf("missing flynn-init binary")
}
log.Info("updating flynn-host daemon on all hosts")
if err := eachHost(func(host *cluster.Host, log log15.Logger) error {
// TODO(lmars): handle daemons using custom flags (e.g. --state=/foo)
_, err := host.Update(
flynnHost,
"daemon",
"--id", host.ID(),
"--flynn-init", flynnInit,
)
if err != nil {
log.Error("error updating binaries", "err", err)
return err
}
log.Info("flynn-host updated successfully")
return nil
}); err != nil {
return err
}
updaterImage, ok := images["flynn/updater"]
if !ok {
e := "missing flynn/updater image"
log.Error(e)
return errors.New(e)
}
imageJSON, err := json.Marshal(images)
if err != nil {
log.Error("error encoding images", "err", err)
return err
}
// use a flag to determine whether to use a TTY log formatter because actually
// assigning a TTY to the job causes reading images via stdin to fail.
cmd := exec.Command(exec.DockerImage(updaterImage), "/bin/updater", fmt.Sprintf("--tty=%t", term.IsTerminal(os.Stdout.Fd())))
cmd.Stdin = bytes.NewReader(imageJSON)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
if err := cmd.Run(); err != nil {
return err
}
log.Info("update complete")
return nil
}