Check if newer version is available (#439)

* Check if newer version is available

* Update README

* Update internal/version/check_update.go

Co-authored-by: Jaime Soriano Pastor <jaime.soriano@elastic.co>

Co-authored-by: Jaime Soriano Pastor <jaime.soriano@elastic.co>

Author: mtojek

README.md

@@ -11,14 +11,9 @@ Currently, `elastic-package` only supports packages of type [Elastic Integration
 
 ## Getting started
 
-Download and build the latest master of `elastic-package` binary:
-
-```bash
-git clone https://github.com/elastic/elastic-package.git
-make build
-```
+Download latest release from the [Releases](https://github.com/elastic/elastic-package/releases/latest) page.
 
-Alternatively, you may use `go get` but you will not be able to use the `elastic-package version` command.
+Alternatively, you may use `go get` but you will not be able to use the `elastic-package version` command or check updates.
 
 ```bash
 go get github.com/elastic/elastic-package
@@ -39,6 +34,15 @@ Run the `help` command and see available commands:
 elastic-package help
 ```
 
+## Development
+
+Download and build the latest master of `elastic-package` binary:
+
+```bash
+git clone https://github.com/elastic/elastic-package.git
+make build
+```
+
 ## Commands
 
 `elastic-package` currently offers the commands listed below.

cmd/root.go

@@ -11,6 +11,7 @@ import (
 
 	"github.com/elastic/elastic-package/internal/cobraext"
 	"github.com/elastic/elastic-package/internal/logger"
+	"github.com/elastic/elastic-package/internal/version"
 )
 
 var commands = []*cobraext.Command{
@@ -36,10 +37,15 @@ var commands = []*cobraext.Command{
 // RootCmd creates and returns root cmd for elastic-package
 func RootCmd() *cobra.Command {
 	rootCmd := &cobra.Command{
-		Use:               "elastic-package",
-		Short:             "elastic-package - Command line tool for developing Elastic Integrations",
-		SilenceUsage:      true,
-		PersistentPreRunE: processPersistentFlags,
+		Use:          "elastic-package",
+		Short:        "elastic-package - Command line tool for developing Elastic Integrations",
+		SilenceUsage: true,
+		PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
+			return cobraext.ComposeCommandActions(cmd, args,
+				processPersistentFlags,
+				checkVersionUpdate,
+			)
+		},
 	}
 	rootCmd.PersistentFlags().BoolP(cobraext.VerboseFlagName, "v", false, cobraext.VerboseFlagDescription)
 
@@ -69,3 +75,8 @@ func processPersistentFlags(cmd *cobra.Command, args []string) error {
 	}
 	return nil
 }
+
+func checkVersionUpdate(cmd *cobra.Command, args []string) error {
+	version.CheckUpdate()
+	return nil
+}

internal/github/client.go

@@ -6,14 +6,15 @@ package github
 
 import (
 	"context"
+	"net/http"
 
 	"github.com/pkg/errors"
 
 	"github.com/google/go-github/v32/github"
 	"golang.org/x/oauth2"
 )
 
-// Client method creates new instance of the GitHub API client.
+// Client function creates new instance of the GitHub API client.
 func Client() (*github.Client, error) {
 	authToken, err := AuthToken()
 	if err != nil {
@@ -24,6 +25,11 @@ func Client() (*github.Client, error) {
 	))), nil
 }
 
+// UnauthorizedClient function returns unauthorized instance of Github API client.
+func UnauthorizedClient() *github.Client {
+	return github.NewClient(new(http.Client))
+}
+
 // User method returns the GitHub authenticated user.
 func User(client *github.Client) (string, error) {
 	user, _, err := client.Users.Get(context.Background(), "")

internal/version/check_update.go

@@ -0,0 +1,56 @@
+// Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+// or more contributor license agreements. Licensed under the Elastic License;
+// you may not use this file except in compliance with the Elastic License.
+
+package version
+
+import (
+	"context"
+
+	"github.com/Masterminds/semver"
+
+	"github.com/elastic/elastic-package/internal/github"
+	"github.com/elastic/elastic-package/internal/logger"
+)
+
+const (
+	repositoryOwner = "elastic"
+	repositoryName  = "elastic-package"
+)
+
+// CheckUpdate function checks using Github Release API if newer version is available.
+func CheckUpdate() {
+	if Tag == "" {
+		logger.Debugf("Distribution built without a version tag, can't determine release chronology. Please consider using official releases at " +
+			"https://github.com/elastic/elastic-package/releases")
+		return
+	}
+
+	githubClient := github.UnauthorizedClient()
+	release, _, err := githubClient.Repositories.GetLatestRelease(context.TODO(), repositoryOwner, repositoryName)
+	if err != nil {
+		logger.Debugf("Error: cant't check latest release, %v", err)
+		return
+	}
+
+	if release.TagName == nil || *release.TagName == "" {
+		logger.Debugf("Error: release tag is empty")
+		return
+	}
+
+	currentVersion, err := semver.NewVersion(Tag[1:]) // strip "v" prefix
+	if err != nil {
+		logger.Debugf("Error: cant't parse current version tage, %v", err)
+		return
+	}
+
+	releaseVersion, err := semver.NewVersion((*release.TagName)[1:]) // strip "v" prefix
+	if err != nil {
+		logger.Debugf("Error: cant't parse current version tage, %v", err)
+		return
+	}
+
+	if currentVersion.LessThan(releaseVersion) {
+		logger.Infof("New version is available - %s. Download from: %s", *release.TagName, *release.HTMLURL)
+	}
+}

tools/readme/readme.md.tmpl

@@ -11,14 +11,9 @@ Currently, `elastic-package` only supports packages of type [Elastic Integration
 
 ## Getting started
 
-Download and build the latest master of `elastic-package` binary:
-
-```bash
-git clone https://github.com/elastic/elastic-package.git
-make build
-```
+Download latest release from the [Releases](https://github.com/elastic/elastic-package/releases/latest) page.
 
-Alternatively, you may use `go get` but you will not be able to use the `elastic-package version` command.
+Alternatively, you may use `go get` but you will not be able to use the `elastic-package version` command or check updates.
 
 ```bash
 go get github.com/elastic/elastic-package
@@ -39,6 +34,15 @@ Run the `help` command and see available commands:
 elastic-package help
 ```
 
+## Development
+
+Download and build the latest master of `elastic-package` binary:
+
+```bash
+git clone https://github.com/elastic/elastic-package.git
+make build
+```
+
 ## Commands
 
 `elastic-package` currently offers the commands listed below.