add update command to self-update console (#618)

cmd/console/main.go

@@ -54,6 +54,7 @@ VERSION:
 
 var appCmds = []cli.Command{
 	serverCmd,
+	updateCmd,
 }
 
 func newApp(name string) *cli.App {

cmd/console/update.go

@@ -0,0 +1,154 @@
+// This file is part of MinIO Console Server
+// Copyright (c) 2021 MinIO, Inc.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package main
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+	"os"
+	"runtime"
+	"strings"
+	"time"
+
+	"github.com/blang/semver/v4"
+	"github.com/cheggaaa/pb/v3"
+	"github.com/minio/cli"
+	"github.com/minio/console/pkg"
+	"github.com/minio/selfupdate"
+)
+
+func getUpdateTransport(timeout time.Duration) http.RoundTripper {
+	var updateTransport http.RoundTripper = &http.Transport{
+		Proxy: http.ProxyFromEnvironment,
+		DialContext: (&net.Dialer{
+			Timeout:   timeout,
+			KeepAlive: timeout,
+			DualStack: true,
+		}).DialContext,
+		IdleConnTimeout:       timeout,
+		TLSHandshakeTimeout:   timeout,
+		ExpectContinueTimeout: timeout,
+		DisableCompression:    true,
+	}
+	return updateTransport
+}
+
+func getUpdateReaderFromURL(u string, transport http.RoundTripper) (io.ReadCloser, int64, error) {
+	clnt := &http.Client{
+		Transport: transport,
+	}
+	req, err := http.NewRequest(http.MethodGet, u, nil)
+	if err != nil {
+		return nil, -1, err
+	}
+
+	resp, err := clnt.Do(req)
+	if err != nil {
+		return nil, -1, err
+	}
+	return resp.Body, resp.ContentLength, nil
+}
+
+const defaultPubKey = "RWTx5Zr1tiHQLwG9keckT0c45M3AGeHD6IvimQHpyRywVWGbP1aVSGav"
+
+func getLatestRelease(tr http.RoundTripper) (string, error) {
+	releaseURL := "https://api.github.com/repos/minio/console/releases/latest"
+
+	body, _, err := getUpdateReaderFromURL(releaseURL, tr)
+	if err != nil {
+		return "", fmt.Errorf("unable to access github release URL %w", err)
+	}
+	defer body.Close()
+
+	lm := make(map[string]interface{})
+	if err = json.NewDecoder(body).Decode(&lm); err != nil {
+		return "", err
+	}
+	rel, ok := lm["tag_name"].(string)
+	if !ok {
+		return "", errors.New("unable to find latest release tag")
+	}
+	return rel, nil
+}
+
+// update console in-place
+var updateCmd = cli.Command{
+	Name:   "update",
+	Usage:  "update console to latest release",
+	Action: updateInplace,
+}
+
+func updateInplace(ctx *cli.Context) error {
+	transport := getUpdateTransport(30 * time.Second)
+	rel, err := getLatestRelease(transport)
+	if err != nil {
+		return err
+	}
+
+	latest, err := semver.Make(strings.TrimPrefix(rel, "v"))
+	if err != nil {
+		return err
+	}
+
+	current, err := semver.Make(pkg.Version)
+	if err != nil {
+		return err
+	}
+
+	if current.GTE(latest) {
+		fmt.Printf("You are already running the latest version v%v.\n", pkg.Version)
+		return nil
+	}
+
+	consoleBin := fmt.Sprintf("https://github.com/minio/console/releases/download/%s/console-%s-%s", rel, runtime.GOOS, runtime.GOARCH)
+	reader, length, err := getUpdateReaderFromURL(consoleBin, transport)
+	if err != nil {
+		return fmt.Errorf("unable to fetch binary from %s: %w", consoleBin, err)
+	}
+
+	minisignPubkey := os.Getenv("CONSOLE_MINISIGN_PUBKEY")
+	if minisignPubkey == "" {
+		minisignPubkey = defaultPubKey
+	}
+
+	v := selfupdate.NewVerifier()
+	if err = v.LoadFromURL(consoleBin+".minisig", minisignPubkey, transport); err != nil {
+		return fmt.Errorf("unable to fetch binary signature for %s: %w", consoleBin, err)
+	}
+	opts := selfupdate.Options{
+		Verifier: v,
+	}
+
+	tmpl := `{{ red "Downloading:" }} {{bar . (red "[") (green "=") (red "]")}} {{speed . | rndcolor }}`
+	bar := pb.ProgressBarTemplate(tmpl).Start64(length)
+	barReader := bar.NewProxyReader(reader)
+	if err = selfupdate.Apply(barReader, opts); err != nil {
+		bar.Finish()
+		if rerr := selfupdate.RollbackError(err); rerr != nil {
+			return rerr
+		}
+		return err
+	}
+
+	bar.Finish()
+	fmt.Printf("Updated 'console' to latest release %s\n", rel)
+	return nil
+}