Rename mc --> cmd

cmd/update-main.go

@@ -0,0 +1,215 @@
+/*
+ * Minio Client (C) 2015 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package cmd
+
+import (
+	"encoding/json"
+	"errors"
+	"io/ioutil"
+	"net/http"
+	"runtime"
+	"strings"
+	"time"
+
+	"github.com/fatih/color"
+	"github.com/minio/cli"
+	"github.com/minio/mc/pkg/console"
+	"github.com/minio/minio/pkg/probe"
+)
+
+// command specific flags.
+var (
+	updateFlags = []cli.Flag{
+		cli.BoolFlag{
+			Name:  "help, h",
+			Usage: "Help for update.",
+		},
+		cli.BoolFlag{
+			Name:  "experimental, E",
+			Usage: "Check experimental update.",
+		},
+	}
+)
+
+// Check for new software updates.
+var updateCmd = cli.Command{
+	Name:   "update",
+	Usage:  "Check for a new software update.",
+	Action: mainUpdate,
+	Flags:  append(updateFlags, globalFlags...),
+	CustomHelpTemplate: `Name:
+   mc {{.Name}} - {{.Usage}}
+
+USAGE:
+   mc {{.Name}} [FLAGS]
+
+FLAGS:
+  {{range .Flags}}{{.}}
+  {{end}}
+EXAMPLES:
+   1. Check for any new official release.
+      $ mc {{.Name}}
+
+   2. Check for any new experimental release.
+      $ mc {{.Name}} --experimental
+`,
+}
+
+// update URL endpoints.
+const (
+	mcUpdateStableURL       = "https://dl.minio.io/client/mc/release"
+	mcUpdateExperimentalURL = "https://dl.minio.io/client/mc/experimental"
+)
+
+// updateMessage container to hold update messages.
+type updateMessage struct {
+	Status   string `json:"status"`
+	Update   bool   `json:"update"`
+	Download string `json:"downloadURL"`
+	Version  string `json:"version"`
+}
+
+// String colorized update message.
+func (u updateMessage) String() string {
+	if !u.Update {
+		return console.Colorize("Update", "You are already running the most recent version of ‘mc’.")
+	}
+	var msg string
+	if runtime.GOOS == "windows" {
+		msg = "Download " + u.Download
+	} else {
+		msg = "Download " + u.Download
+	}
+	msg, err := colorizeUpdateMessage(msg)
+	fatalIf(err.Trace(msg), "Unable to colorize experimental update notification string ‘"+msg+"’.")
+	return msg
+}
+
+// JSON jsonified update message.
+func (u updateMessage) JSON() string {
+	u.Status = "success"
+	updateMessageJSONBytes, e := json.Marshal(u)
+	fatalIf(probe.NewError(e), "Unable to marshal into JSON.")
+
+	return string(updateMessageJSONBytes)
+}
+
+func parseReleaseData(data string) (time.Time, *probe.Error) {
+	releaseStr := strings.Fields(data)
+	if len(releaseStr) < 2 {
+		return time.Time{}, probe.NewError(errors.New("Update data malformed"))
+	}
+	releaseDate := releaseStr[1]
+	releaseDateSplits := strings.SplitN(releaseDate, ".", 3)
+	if len(releaseDateSplits) < 3 {
+		return time.Time{}, probe.NewError(errors.New("Update data malformed"))
+	}
+	if releaseDateSplits[0] != "mc" {
+		return time.Time{}, probe.NewError(errors.New("Update data malformed, missing mc tag"))
+	}
+	// "OFFICIAL" tag is still kept for backward compatibility, we should remove this for the next release.
+	if releaseDateSplits[1] != "RELEASE" && releaseDateSplits[1] != "OFFICIAL" {
+		return time.Time{}, probe.NewError(errors.New("Update data malformed, missing RELEASE tag"))
+	}
+	dateSplits := strings.SplitN(releaseDateSplits[2], "T", 2)
+	if len(dateSplits) < 2 {
+		return time.Time{}, probe.NewError(errors.New("Update data malformed, not in modified RFC3359 form"))
+	}
+	dateSplits[1] = strings.Replace(dateSplits[1], "-", ":", -1)
+	date := strings.Join(dateSplits, "T")
+
+	parsedDate, e := time.Parse(time.RFC3339, date)
+	if e != nil {
+		return time.Time{}, probe.NewError(e)
+	}
+	return parsedDate, nil
+}
+
+// verify updates for releases.
+func getReleaseUpdate(updateURL string) {
+	// Construct a new update url.
+	newUpdateURLPrefix := updateURL + "/" + runtime.GOOS + "-" + runtime.GOARCH
+	newUpdateURL := newUpdateURLPrefix + "/mc.shasum"
+
+	// Instantiate a new client with 3 sec timeout.
+	client := &http.Client{
+		Timeout: 3000 * time.Millisecond,
+	}
+
+	// Get the downloadURL.
+	var downloadURL string
+	switch runtime.GOOS {
+	case "windows":
+		// For windows and darwin.
+		downloadURL = newUpdateURLPrefix + "/mc.exe"
+	default:
+		// For all other operating systems.
+		downloadURL = newUpdateURLPrefix + "/mc"
+	}
+
+	data, e := client.Get(newUpdateURL)
+	fatalIf(probe.NewError(e), "Unable to read from update URL ‘"+newUpdateURL+"’.")
+
+	if strings.HasPrefix(MCVersion, "DEVELOPMENT.GOGET") {
+		fatalIf(errDummy().Trace(newUpdateURL),
+			"Update mechanism is not supported for ‘go get’ based binary builds.  Please download official releases from https://minio.io/#minio")
+	}
+
+	current, e := time.Parse(time.RFC3339, MCVersion)
+	fatalIf(probe.NewError(e), "Unable to parse version string as time.")
+
+	if current.IsZero() {
+		fatalIf(errDummy().Trace(newUpdateURL),
+			"Updates not supported for custom builds. Version field is empty. Please download official releases from https://minio.io/#minio")
+	}
+
+	body, e := ioutil.ReadAll(data.Body)
+	fatalIf(probe.NewError(e), "Fetching updates failed. Please try again.")
+
+	latest, err := parseReleaseData(string(body))
+	fatalIf(err.Trace(newUpdateURL), "Please report this issue at https://github.com/minio/mc/issues.")
+
+	if latest.IsZero() {
+		fatalIf(errDummy().Trace(newUpdateURL),
+			"Unable to validate any update available at this time. Please open an issue at https://github.com/minio/mc/issues")
+	}
+
+	updateMsg := updateMessage{
+		Download: downloadURL,
+		Version:  MCVersion,
+	}
+	if latest.After(current) {
+		updateMsg.Update = true
+	}
+	printMsg(updateMsg)
+}
+
+// main entry point for update command.
+func mainUpdate(ctx *cli.Context) {
+	// Set global flags from context.
+	setGlobalsFromContext(ctx)
+
+	// Additional command speific theme customization.
+	console.SetColor("Update", color.New(color.FgGreen, color.Bold))
+
+	// Check for update.
+	if ctx.Bool("experimental") {
+		getReleaseUpdate(mcUpdateExperimentalURL)
+	} else {
+		getReleaseUpdate(mcUpdateStableURL)
+	}
+}