commands/updatecli: Add

Author: rajivr

commands/updatecli.go

@@ -0,0 +1,51 @@
+package commands
+
+import (
+	"github.com/blang/semver"
+	"github.com/docker/machine/libmachine"
+	"github.com/docker/machine/libmachine/log"
+	"github.com/lambda-linux/lambda-machine-local/version"
+	"github.com/rhysd/go-github-selfupdate/selfupdate"
+)
+
+const (
+	slug = "lambda-linux/lambda-machine-local"
+)
+
+func cmdUpdateCli(c CommandLine, api libmachine.API) error {
+	if len(c.Args()) != 0 {
+		return ErrTooManyArguments
+	}
+
+	if log.GetDebug() {
+		log.Debug("Enabling selfupdate.EnableLog()")
+		selfupdate.EnableLog()
+	}
+
+	latest_gh, found, err := selfupdate.DetectLatest(slug)
+	if err != nil {
+		log.Info(err)
+		return nil
+	}
+	if !found {
+		log.Info("No release was found")
+		return nil
+	}
+
+	current_ver := semver.MustParse(version.Version)
+
+	if current_ver.GTE(latest_gh.Version) {
+		log.Infof("Lambda Machine Local version %s is currently the latest version", current_ver)
+		return nil
+	}
+
+	log.Info("Starting update...")
+	latest_gh, err = selfupdate.UpdateSelf(current_ver, slug)
+	if err != nil {
+		log.Info(err)
+		return nil
+	}
+	log.Infof("Updated to latest Lambda Machine Local version %s", latest_gh.Version)
+
+	return nil
+}