Implement update command

Makefile

@@ -6,7 +6,7 @@ checkdeps:
 
 checkgopath:
 	@echo "Checking if project is at ${GOPATH}"
-	@for miniofspath in $(echo ${GOPATH} | sed 's/:/\n/g'); do if [ ! -d ${mcpath}/src/github.com/minio/minio ]; then echo "Project not found in ${miniofspath}, please follow instructions provided at https://github.com/minio/minio/blob/master/CONTRIBUTING.md#setup-your-minio-github-repository" && exit 1; fi done
+	@for miniopath in $(echo ${GOPATH} | sed 's/:/\n/g'); do if [ ! -d ${miniopath}/src/github.com/minio/minio ]; then echo "Project not found in ${miniopath}, please follow instructions provided at https://github.com/minio/minio/blob/master/CONTRIBUTING.md#setup-your-minio-github-repository" && exit 1; fi done
 
 getdeps: checkdeps checkgopath
 	@go get github.com/golang/lint/golint && echo "Installed golint:"
@@ -69,3 +69,5 @@ clean:
 	@echo "Cleaning up all the generated files:"
 	@rm -fv cover.out
 	@rm -fv minio
+	@rm -fv minio.test
+	@rm -fv pkg/fs/fs.test

main.go

@@ -91,6 +91,7 @@ func registerApp() *cli.App {
 	// register all commands
 	registerCommand(serverCmd)
 	registerCommand(versionCmd)
+	registerCommand(updateCmd)
 
 	// register all flags
 	registerFlag(addressFlag)

notifier.go

@@ -0,0 +1,86 @@
+/*
+ * Minio Cloud Storage, (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 main
+
+import (
+	"fmt"
+	"math"
+	"runtime"
+	"strings"
+
+	"github.com/fatih/color"
+	"github.com/minio/minio-xl/pkg/probe"
+	"github.com/olekukonko/ts"
+)
+
+// colorizeUpdateMessage - inspired from Yeoman project npm package https://github.com/yeoman/update-notifier
+func colorizeUpdateMessage(updateString string) (string, *probe.Error) {
+	// initialize coloring
+	cyan := color.New(color.FgCyan, color.Bold).SprintFunc()
+	yellow := color.New(color.FgYellow, color.Bold).SprintfFunc()
+
+	// calculate length without color coding, due to ANSI color characters padded to actual
+	// string the final length is wrong than the original string length
+	line1Str := fmt.Sprintf("  Update available: ")
+	line2Str := fmt.Sprintf("  Run \"%s\" to update. ", updateString)
+	line1Length := len(line1Str)
+	line2Length := len(line2Str)
+
+	// populate lines with color coding
+	line1InColor := line1Str
+	line2InColor := fmt.Sprintf("  Run \"%s\" to update. ", cyan(updateString))
+
+	// calculate the rectangular box size
+	maxContentWidth := int(math.Max(float64(line1Length), float64(line2Length)))
+	line1Rest := maxContentWidth - line1Length
+	line2Rest := maxContentWidth - line2Length
+
+	terminal, err := ts.GetSize()
+	if err != nil {
+		return "", probe.NewError(err)
+	}
+
+	var message string
+	switch {
+	case len(line2Str) > terminal.Col():
+		message = "\n" + line1InColor + "\n" + line2InColor + "\n"
+	default:
+		// on windows terminal turn off unicode characters
+		var top, bottom, sideBar string
+		if runtime.GOOS == "windows" {
+			top = yellow("*" + strings.Repeat("*", maxContentWidth) + "*")
+			bottom = yellow("*" + strings.Repeat("*", maxContentWidth) + "*")
+			sideBar = yellow("|")
+		} else {
+			// color the rectangular box, use unicode characters here
+			top = yellow("┏" + strings.Repeat("━", maxContentWidth) + "┓")
+			bottom = yellow("┗" + strings.Repeat("━", maxContentWidth) + "┛")
+			sideBar = yellow("┃")
+		}
+		// fill spaces to the rest of the area
+		spacePaddingLine1 := strings.Repeat(" ", line1Rest)
+		spacePaddingLine2 := strings.Repeat(" ", line2Rest)
+
+		// construct the final message
+		message = "\n" + top + "\n" +
+			sideBar + line1InColor + spacePaddingLine1 + sideBar + "\n" +
+			sideBar + line2InColor + spacePaddingLine2 + sideBar + "\n" +
+			bottom + "\n"
+	}
+	// finally print the message
+	return message, nil
+}

typed-errors.go

@@ -18,6 +18,9 @@ package main
 
 import "errors"
 
+// errInvalidArgument means that input argument is invalid
+var errInvalidArgument = errors.New("Invalid Argument")
+
 // errMissingAuthHeader means that Authorization header
 // has missing value or it is empty.
 var errMissingAuthHeaderValue = errors.New("Missing auth header value")

update-main.go

@@ -0,0 +1,203 @@
+/*
+ * Minio Cloud Storage, (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 main
+
+import (
+	"encoding/json"
+	"errors"
+	"net/http"
+	"net/url"
+	"runtime"
+	"strings"
+	"time"
+
+	"github.com/fatih/color"
+	"github.com/minio/cli"
+	"github.com/minio/minio-xl/pkg/probe"
+)
+
+// Check for new software updates.
+var updateCmd = cli.Command{
+	Name:   "update",
+	Usage:  "Check for new software updates.",
+	Action: mainUpdate,
+	CustomHelpTemplate: `Name:
+   minio {{.Name}} - {{.Usage}}
+
+USAGE:
+   minio {{.Name}} release
+   minio {{.Name}} experimental
+
+EXAMPLES:
+   1. Check for new official releases
+      $ minio {{.Name}} release
+
+   2. Check for new experimental releases
+      $ minio {{.Name}} experimental
+`,
+}
+
+// updates container to hold updates json
+type updates struct {
+	BuildDate string
+	Platforms map[string]string
+}
+
+// updateMessage container to hold update messages
+type updateMessage struct {
+	Update   bool   `json:"update"`
+	Download string `json:"downloadURL"`
+	Version  string `json:"version"`
+}
+
+// String colorized update message
+func (u updateMessage) String() string {
+	if u.Update {
+		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+"’.", nil)
+		return msg
+	}
+	updateMessage := color.New(color.FgGreen, color.Bold).SprintfFunc()
+	return updateMessage("You are already running the most recent version of ‘minio’.")
+}
+
+// JSON jsonified update message
+func (u updateMessage) JSON() string {
+	updateMessageJSONBytes, err := json.Marshal(u)
+	fatalIf(probe.NewError(err), "Unable to marshal into JSON.", nil)
+
+	return string(updateMessageJSONBytes)
+}
+
+func getExperimentalUpdate() {
+	current, e := time.Parse(http.TimeFormat, minioVersion)
+	fatalIf(probe.NewError(e), "Unable to parse Version string as time.", nil)
+
+	if current.IsZero() {
+		fatalIf(probe.NewError(errors.New("")), "Experimental updates are not supported for custom build. Version field is empty. Please download official releases from https://dl.minio.io:9000", nil)
+	}
+
+	resp, err := http.Get(minioExperimentalURL)
+	fatalIf(probe.NewError(err), "Unable to initalize experimental URL.", nil)
+
+	var experimentals updates
+	decoder := json.NewDecoder(resp.Body)
+	defer resp.Body.Close()
+	e = decoder.Decode(&experimentals)
+	fatalIf(probe.NewError(e), "Unable to decode experimental update notification.", nil)
+
+	latest, e := time.Parse(http.TimeFormat, experimentals.BuildDate)
+	fatalIf(probe.NewError(e), "Unable to parse BuildDate.", nil)
+
+	if latest.IsZero() {
+		fatalIf(probe.NewError(errors.New("")), "Unable to validate any experimental update available at this time. Please open an issue at https://github.com/minio/minio/issues", nil)
+	}
+
+	minioExperimentalURLParse, err := url.Parse(minioExperimentalURL)
+	if err != nil {
+		fatalIf(probe.NewError(err), "Unable to parse URL: "+minioExperimentalURL, nil)
+	}
+	downloadURL := minioExperimentalURLParse.Scheme + "://" + minioExperimentalURLParse.Host + "/" + experimentals.Platforms[runtime.GOOS]
+	updateMessage := updateMessage{
+		Download: downloadURL,
+		Version:  minioVersion,
+	}
+	if latest.After(current) {
+		updateMessage.Update = true
+	}
+	if globalJSONFlag {
+		Println(updateMessage.JSON())
+	} else {
+		Println(updateMessage)
+	}
+}
+
+func getReleaseUpdate() {
+	current, e := time.Parse(http.TimeFormat, minioVersion)
+	fatalIf(probe.NewError(e), "Unable to parse Version string as time.", nil)
+
+	if current.IsZero() {
+		fatalIf(probe.NewError(errors.New("")), "Updates not supported for custom build. Version field is empty. Please download official releases from https://dl.minio.io:9000", nil)
+	}
+
+	resp, err := http.Get(minioUpdateURL)
+	fatalIf(probe.NewError(err), "Unable to initalize experimental URL.", nil)
+
+	var releases updates
+	decoder := json.NewDecoder(resp.Body)
+	e = decoder.Decode(&releases)
+	fatalIf(probe.NewError(e), "Unable to decode update notification.", nil)
+
+	latest, e := time.Parse(http.TimeFormat, releases.BuildDate)
+	fatalIf(probe.NewError(e), "Unable to parse BuildDate.", nil)
+
+	if latest.IsZero() {
+		fatalIf(probe.NewError(errors.New("")), "Unable to validate any update available at this time. Please open an issue at https://github.com/minio/minio/issues", nil)
+	}
+
+	minioUpdateURLParse, err := url.Parse(minioUpdateURL)
+	if err != nil {
+		fatalIf(probe.NewError(err), "Unable to parse URL: "+minioUpdateURL, nil)
+	}
+	downloadURL := minioUpdateURLParse.Scheme + "://" + minioUpdateURLParse.Host + "/" + releases.Platforms[runtime.GOOS]
+	updateMessage := updateMessage{
+		Download: downloadURL,
+		Version:  minioVersion,
+	}
+	if latest.After(current) {
+		updateMessage.Update = true
+	}
+
+	if globalJSONFlag {
+		Println(updateMessage.JSON())
+	} else {
+		Println(updateMessage)
+	}
+}
+
+const (
+	minioUpdateURL       = "https://dl.minio.io:9000/updates/minio/updates.json"
+	minioExperimentalURL = "https://dl.minio.io:9000/updates/minio/experimental.json"
+)
+
+func checkUpdateSyntax(ctx *cli.Context) {
+	if ctx.Args().First() == "help" || !ctx.Args().Present() {
+		cli.ShowCommandHelpAndExit(ctx, "update", 1) // last argument is exit code
+	}
+	arg := strings.TrimSpace(ctx.Args().First())
+	if arg != "release" && arg != "experimental" {
+		fatalIf(probe.NewError(errInvalidArgument), "Unrecognized argument provided.", nil)
+	}
+}
+
+// mainUpdate -
+func mainUpdate(ctx *cli.Context) {
+	checkUpdateSyntax(ctx)
+	arg := strings.TrimSpace(ctx.Args().First())
+	switch arg {
+	case "release":
+		getReleaseUpdate()
+	case "experimental":
+		getExperimentalUpdate()
+	}
+}

verify-runtime.go

@@ -90,6 +90,6 @@ func checkGolangRuntimeVersion() {
 	v1 := newVersion(getNormalizedGolangVersion())
 	v2 := newVersion(minGolangRuntimeVersion)
 	if v1.LessThan(v2) {
-		Fatalln("Old Golang runtime version ‘" + v1.String() + "’ detected., ‘mc’ requires minimum go1.5.1 or later.")
+		Fatalln("Old Golang runtime version ‘" + v1.String() + "’ detected., ‘minio’ requires minimum go1.5.1 or later.")
 	}
 }

version-main.go

@@ -23,13 +23,10 @@ var versionCmd = cli.Command{
 	Usage:  "Print version",
 	Action: mainVersion,
 	CustomHelpTemplate: `NAME:
-   mc {{.Name}} - {{.Usage}}
+   minio {{.Name}} - {{.Usage}}
 
 USAGE:
-   mc {{.Name}} {{if .Description}}
+   minio {{.Name}} {{if .Description}}
-
-EXAMPLES:
-
 `,
 }