Golang log.Warn函數代碼示例

// CheckLatest checks whether this version of Helm is the latest version.
//
// This does not ensure that this is the latest. If a newer version is found,
// this generates a message indicating that.
//
// The passed-in version is the base version that will be checked against the
// remote release list.
func CheckLatest(version string) {
	ver, err := release.LatestVersion()
	if err != nil {
		log.Warn("Skipped Helm version check: %s", err)
		return
	}

	current, err := semver.NewVersion(version)
	if err != nil {
		log.Warn("Local version %s is not well-formed", version)
		return
	}
	remote, err := semver.NewVersion(ver)
	if err != nil {
		log.Warn("Remote version %s is not well-formed", ver)
		return
	}

	if remote.GreaterThan(current) {
		log.Warn("A new version of Helm is available. You have %s. The latest is %v", version, ver)
		if dl, err := release.LatestDownloadURL(); err == nil {
			log.Info("Download version %s here: %s", ver, dl)
		}
	}

}

// Fetch gets a chart from the source repo and copies to the workdir.
//
// - chartName is the source
// - lname is the local name for that chart (chart-name); if blank, it is set to the chart.
// - homedir is the home directory for the user
func Fetch(chartName, lname, homedir string) {

	r := mustConfig(homedir).Repos
	repository, chartName := r.RepoChart(chartName)

	if lname == "" {
		lname = chartName
	}

	fetch(chartName, lname, homedir, repository)

	chartFilePath := helm.WorkspaceChartDirectory(homedir, lname, Chartfile)
	cfile, err := chart.LoadChartfile(chartFilePath)
	if err != nil {
		log.Die("Source is not a valid chart. Missing Chart.yaml: %s", err)
	}

	deps, err := dependency.Resolve(cfile, helm.WorkspaceChartDirectory(homedir))
	if err != nil {
		log.Warn("Could not check dependencies: %s", err)
		return
	}

	if len(deps) > 0 {
		log.Warn("Unsatisfied dependencies:")
		for _, d := range deps {
			log.Msg("\t%s %s", d.Name, d.Version)
		}
	}

	log.Info("Fetched chart into workspace %s", helm.WorkspaceChartDirectory(homedir, lname))
	log.Info("Done")
}

// AltInstall allows loading a chart from the current directory.
//
// It does not directly support chart tables (repos).
func AltInstall(chartName, cachedir, home, namespace string, force bool, dryRun bool) {
	// Make sure there is a chart in the cachedir.
	if _, err := os.Stat(filepath.Join(cachedir, "Chart.yaml")); err != nil {
		log.Die("Expected a Chart.yaml in %s: %s", cachedir, err)
	}
	// Make sure there is a manifests dir.
	if fi, err := os.Stat(filepath.Join(cachedir, "manifests")); err != nil {
		log.Die("Expected 'manifests/' in %s: %s", cachedir, err)
	} else if !fi.IsDir() {
		log.Die("Expected 'manifests/' to be a directory in %s: %s", cachedir, err)
	}

	dest := filepath.Join(home, WorkspaceChartPath, chartName)
	if ok, err := isSamePath(dest, cachedir); err != nil || ok {
		log.Die("Cannot read from and write to the same place: %s. %v", cachedir, err)
	}

	// Copy the source chart to the workspace. We ruthlessly overwrite in
	// this case.
	if err := copyDir(cachedir, dest); err != nil {
		log.Die("Failed to copy %s to %s: %s", cachedir, dest, err)
	}

	// Load the chart.
	c, err := chart.Load(dest)
	if err != nil {
		log.Die("Failed to load chart: %s", err)
	}

	// Give user the option to bale if dependencies are not satisfied.
	nope, err := dependency.Resolve(c.Chartfile, filepath.Join(home, WorkspaceChartPath))
	if err != nil {
		log.Warn("Failed to check dependencies: %s", err)
		if !force {
			log.Die("Re-run with --force to install anyway.")
		}
	} else if len(nope) > 0 {
		log.Warn("Unsatisfied dependencies:")
		for _, d := range nope {
			log.Msg("\t%s %s", d.Name, d.Version)
		}
		if !force {
			log.Die("Stopping install. Re-run with --force to install anyway.")
		}
	}

	msg := "Running `kubectl create -f` ..."
	if dryRun {
		msg = "Performing a dry run of `kubectl create -f` ..."
	}
	log.Info(msg)
	if err := uploadManifests(c, namespace, dryRun); err != nil {
		log.Die("Failed to upload manifests: %s", err)
	}
}

// Install loads a chart into Kubernetes.
//
// If the chart is not found in the workspace, it is fetched and then installed.
//
// During install, manifests are sent to Kubernetes in the ordered specified by InstallOrder.
func Install(chartName, home, namespace string, force bool, generate bool, exclude []string, client kubectl.Runner) {
	ochart := chartName
	r := mustConfig(home).Repos
	table, chartName := r.RepoChart(chartName)

	if !chartFetched(chartName, home) {
		log.Info("No chart named %q in your workspace. Fetching now.", ochart)
		fetch(chartName, chartName, home, table)
	}

	cd := helm.WorkspaceChartDirectory(home, chartName)
	c, err := chart.Load(cd)
	if err != nil {
		log.Die("Failed to load chart: %s", err)
	}

	// Give user the option to bale if dependencies are not satisfied.
	nope, err := dependency.Resolve(c.Chartfile, helm.WorkspaceChartDirectory(home))

	if err != nil {
		log.Warn("Failed to check dependencies: %s", err)
		if !force {
			log.Die("Re-run with --force to install anyway.")
		}
	} else if len(nope) > 0 {
		log.Warn("Unsatisfied dependencies:")
		for _, d := range nope {
			log.Msg("\t%s %s", d.Name, d.Version)
		}
		if !force {
			log.Die("Stopping install. Re-run with --force to install anyway.")
		}
	}

	// Run the generator if -g is set.
	if generate {
		Generate(chartName, home, exclude)
	}

	CheckKubePrereqs()

	log.Info("Running `kubectl create -f` ...")
	if err := uploadManifests(c, namespace, client); err != nil {
		log.Die("Failed to upload manifests: %s", err)
	}
	log.Info("Done")

	PrintREADME(chartName, home)
}

// LintAll vlaidates all charts are well-formed
//
// - homedir is the home directory for the user
func LintAll(homedir string) {
	md := util.WorkspaceChartDirectory(homedir, "*")
	chartPaths, err := filepath.Glob(md)
	if err != nil {
		log.Warn("Could not find any charts in %q: %s", md, err)
	}

	if len(chartPaths) == 0 {
		log.Warn("Could not find any charts in %q", md)
	} else {
		for _, chartPath := range chartPaths {
			Lint(chartPath)
		}
	}
}

func fetch(chartName, lname, homedir, chartpath string) {
	src := helm.CacheDirectory(homedir, chartpath, chartName)
	dest := helm.WorkspaceChartDirectory(homedir, lname)

	fi, err := os.Stat(src)
	if err != nil {
		log.Warn("Oops. Looks like there was an issue finding the chart, %s, n %s. Running `helm update` to ensure you have the latest version of all Charts from Github...", lname, src)
		Update(homedir)
		fi, err = os.Stat(src)
		if err != nil {
			log.Die("Chart %s not found in %s", lname, src)
		}
		log.Info("Good news! Looks like that did the trick. Onwards and upwards!")
	}

	if !fi.IsDir() {
		log.Die("Malformed chart %s: Chart must be in a directory.", chartName)
	}

	if err := os.MkdirAll(dest, 0755); err != nil {
		log.Die("Could not create %q: %s", dest, err)
	}

	log.Debug("Fetching %s to %s", src, dest)
	if err := helm.CopyDir(src, dest); err != nil {
		log.Die("Failed copying %s to %s", src, dest)
	}

	if err := updateChartfile(src, dest, lname); err != nil {
		log.Die("Failed to update Chart.yaml: %s", err)
	}
}

// openValues opens a values file and tries to parse it with the right parser.
//
// It returns an interface{} containing data, if found. Any error opening or
// parsing the file will be passed back.
func openValues(filename string) (interface{}, error) {
	data, err := ioutil.ReadFile(filename)
	if err != nil {
		// We generate a warning here, but do not require that a values
		// file exists.
		log.Warn("Skipped file %s: %s", filename, err)
		return map[string]interface{}{}, nil
	}

	ext := filepath.Ext(filename)
	var um func(p []byte, v interface{}) error
	switch ext {
	case ".yaml", ".yml":
		um = yaml.Unmarshal
	case ".toml":
		um = toml.Unmarshal
	case ".json":
		um = json.Unmarshal
	default:
		return nil, fmt.Errorf("Unsupported file type: %s", ext)
	}

	var res interface{}
	err = um(data, &res)
	return res, err
}

// promptConfirm prompts a user to confirm (or deny) something.
//
// True is returned iff the prompt is confirmed.
// Errors are reported to the log, and return false.
//
// Valid confirmations:
// 	y, yes, true, t, aye-aye
//
// Valid denials:
//	n, no, f, false
//
// Any other prompt response will return false, and issue a warning to the
// user.
func promptConfirm(msg string) bool {
	oldState, err := terminal.MakeRaw(0)
	if err != nil {
		log.Err("Could not get terminal: %s", err)
		return false
	}
	defer terminal.Restore(0, oldState)

	f := readerWriter(log.Stdin, log.Stdout)
	t := terminal.NewTerminal(f, msg+" (y/N) ")
	res, err := t.ReadLine()
	if err != nil {
		log.Err("Could not read line: %s", err)
		return false
	}
	res = strings.ToLower(res)
	switch res {
	case "yes", "y", "true", "t", "aye-aye":
		return true
	case "no", "n", "false", "f":
		return false
	}
	log.Warn("Did not understand answer %q, assuming No", res)
	return false
}

// Valid returns true if every validation passes.
func (cv *ChartValidation) Valid() bool {
	var valid bool = true

	fmt.Printf("\nVerifying %s chart is a valid chart...\n", cv.ChartName())
	cv.walk(func(v *Validation) bool {
		v.path = cv.Path
		vv := v.valid()
		if !vv {
			switch v.level {
			case 2:
				cv.ErrorCount = cv.ErrorCount + 1
				msg := v.Message + " : " + strconv.FormatBool(vv)
				log.Err(msg)
			case 1:
				cv.WarningCount = cv.WarningCount + 1
				msg := v.Message + " : " + strconv.FormatBool(vv)
				log.Warn(msg)
			}
		} else {
			msg := v.Message + " : " + strconv.FormatBool(vv)
			log.Info(msg)
		}

		valid = valid && vv
		return valid
	})

	return valid
}

// Files gets a list of all manifest files inside of a chart.
//
// chartDir should contain the path to a chart (the directory which
// holds a Chart.yaml file).
//
// This returns an error if it can't access the directory.
func Files(chartDir string) ([]string, error) {
	dir := filepath.Join(chartDir, "manifests")
	files := []string{}

	if _, err := os.Stat(dir); err != nil {
		return files, err
	}

	// add manifest files
	walker := func(fname string, fi os.FileInfo, e error) error {
		if e != nil {
			log.Warn("Encountered error walking %q: %s", fname, e)
			return nil
		}

		if fi.IsDir() {
			return nil
		}

		if filepath.Ext(fname) == ".yaml" {
			files = append(files, fname)
		}

		return nil
	}
	filepath.Walk(dir, walker)

	return files, nil
}

// sortManifests sorts manifests into their respective categories, adding to the Chart.
func sortManifests(chart *Chart, manifests []*manifest.Manifest) {
	for _, m := range manifests {
		vo := m.VersionedObject

		if m.Version != "v1" {
			log.Warn("Unsupported version %q", m.Version)
			continue
		}

		switch m.Kind {
		default:
			log.Warn("No support for kind %s. Ignoring.", m.Kind)
		case "Pod":
			o, err := vo.Pod()
			if err != nil {
				log.Warn("Failed conversion: %s", err)
			}
			o.Annotations = setOriginFile(o.Annotations, m.Source)
			chart.Pods = append(chart.Pods, o)
		case "ReplicationController":
			o, err := vo.RC()
			if err != nil {
				log.Warn("Failed conversion: %s", err)
			}
			o.Annotations = setOriginFile(o.Annotations, m.Source)
			chart.ReplicationControllers = append(chart.ReplicationControllers, o)
		case "Service":
			o, err := vo.Service()
			if err != nil {
				log.Warn("Failed conversion: %s", err)
			}
			o.Annotations = setOriginFile(o.Annotations, m.Source)
			chart.Services = append(chart.Services, o)
		case "Secret":
			o, err := vo.Secret()
			if err != nil {
				log.Warn("Failed conversion: %s", err)
			}
			o.Annotations = setOriginFile(o.Annotations, m.Source)
			chart.Secrets = append(chart.Secrets, o)
		case "PersistentVolume":
			o, err := vo.PersistentVolume()
			if err != nil {
				log.Warn("Failed conversion: %s", err)
			}
			o.Annotations = setOriginFile(o.Annotations, m.Source)
			chart.PersistentVolumes = append(chart.PersistentVolumes, o)
		case "Namespace":
			o, err := vo.Namespace()
			if err != nil {
				log.Warn("Failed conversion: %s", err)
			}
			o.Annotations = setOriginFile(o.Annotations, m.Source)
			chart.Namespaces = append(chart.Namespaces, o)
		}
	}
}

// Install loads a chart into Kubernetes.
//
// If the chart is not found in the workspace, it is fetched and then installed.
//
// During install, manifests are sent to Kubernetes in the following order:
//
//	- Namespaces
// 	- Secrets
// 	- Volumes
// 	- Services
// 	- Pods
// 	- ReplicationControllers
func Install(chartName, home, namespace string, force bool, dryRun bool) {

	ochart := chartName
	r := mustConfig(home).Repos
	table, chartName := r.RepoChart(chartName)

	if !chartFetched(chartName, home) {
		log.Info("No chart named %q in your workspace. Fetching now.", ochart)
		fetch(chartName, chartName, home, table)
	}

	cd := filepath.Join(home, WorkspaceChartPath, chartName)
	c, err := chart.Load(cd)
	if err != nil {
		log.Die("Failed to load chart: %s", err)
	}

	// Give user the option to bale if dependencies are not satisfied.
	nope, err := dependency.Resolve(c.Chartfile, filepath.Join(home, WorkspaceChartPath))
	if err != nil {
		log.Warn("Failed to check dependencies: %s", err)
		if !force {
			log.Die("Re-run with --force to install anyway.")
		}
	} else if len(nope) > 0 {
		log.Warn("Unsatisfied dependencies:")
		for _, d := range nope {
			log.Msg("\t%s %s", d.Name, d.Version)
		}
		if !force {
			log.Die("Stopping install. Re-run with --force to install anyway.")
		}
	}

	msg := "Running `kubectl create -f` ..."
	if dryRun {
		msg = "Performing a dry run of `kubectl create -f` ..."
	}
	log.Info(msg)
	if err := uploadManifests(c, namespace, dryRun); err != nil {
		log.Die("Failed to upload manifests: %s", err)
	}
	log.Info("Done")

	PrintREADME(chartName, home)
}

// Copy a directory and its subdirectories.
func copyDir(src, dst string) error {

	var failure error

	walker := func(fname string, fi os.FileInfo, e error) error {
		if e != nil {
			log.Warn("Encounter error walking %q: %s", fname, e)
			failure = e
			return nil
		}

		log.Debug("Copying %s", fname)
		rf, err := filepath.Rel(src, fname)
		if err != nil {
			log.Warn("Could not find relative path: %s", err)
			return nil
		}
		df := filepath.Join(dst, rf)

		// Handle directories by creating mirrors.
		if fi.IsDir() {
			if err := os.MkdirAll(df, fi.Mode()); err != nil {
				log.Warn("Could not create %q: %s", df, err)
				failure = err
			}
			return nil
		}

		// Otherwise, copy files.
		in, err := os.Open(fname)
		if err != nil {
			log.Warn("Skipping file %s: %s", fname, err)
			return nil
		}
		out, err := os.Create(df)
		if err != nil {
			in.Close()
			log.Warn("Skipping file copy %s: %s", fname, err)
			return nil
		}
		if _, err = io.Copy(out, in); err != nil {
			log.Warn("Copy from %s to %s failed: %s", fname, df, err)
		}

		if err := out.Close(); err != nil {
			log.Warn("Failed to close %q: %s", df, err)
		}
		if err := in.Close(); err != nil {
			log.Warn("Failed to close reader %q: %s", fname, err)
		}

		return nil
	}
	filepath.Walk(src, walker)
	return failure
}

func uninstallKind(kind []*manifest.Manifest, ns, ktype string, dry bool, client kubectl.Runner) {
	for _, o := range kind {
		if dry {
			log.Msg("%s/%s", ktype, o.Name)
		} else {
			out, err := client.Delete(o.Name, ktype, ns)
			if err != nil {
				log.Warn("Could not delete %s %s (Skipping): %s", ktype, o.Name, err)
			}
			log.Info(string(out))
		}
	}
}

// mustConfig parses a config file or dies trying.
func mustConfig(homedir string) *config.Configfile {
	rpath := filepath.Join(homedir, helm.Configfile)
	cfg, err := config.Load(rpath)
	if err != nil {
		log.Warn("Oops! Looks like we had some issues running your command! Running `helm doctor` to ensure we have all the necessary prerequisites in place...")
		Doctor(homedir)
		cfg, err = config.Load(rpath)
		if err != nil {
			log.Die("Oops! Could not load %s. Error: %s", rpath, err)
		}
		log.Info("Continuing onwards and upwards!")
	}
	return cfg
}