CLI for the installer library (#175)

CLI for the installer library

agent/installer/cli.go

@@ -0,0 +1,134 @@
+// Copyright 2021 VMware, Inc. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+package installer
+
+import (
+	"flag"
+	"fmt"
+	"k8s.io/klog"
+	"k8s.io/klog/klogr"
+)
+
+var (
+	listFlag             = flag.Bool("list", false, "List all supported OS and Kubernetes versions")
+	listBundlesFlag      = flag.Bool("listBundles", false, "List the BYOH Bundle names for all supported OS and Kubernetes versions")
+	detectOSFlag         = flag.Bool("detect", false, "Detects the current operating system")
+	installFlag          = flag.Bool("install", false, "Install a BYOH Bundle")
+	uninstallFlag        = flag.Bool("uninstall", false, "Unnstall a BYOH Bundle")
+	bundleRepoFlag       = flag.String("bundleRepo", "https://projects.registry.vmware.com", "BYOH Bundle Repository. If not set, will look for bundles locally")
+	k8sFlag              = flag.String("k8s", "1.22.1", "Kubernetes version")
+	osFlag               = flag.String("os", "", "OS. If used with install/uninstall, skip os detection")
+	previewOSChangesFlag = flag.Bool("previewOSChanges", false, "Preview the install and uninstall changes for the specified OS")
+)
+
+const (
+	doInstall   = true
+	doUninstall = false
+)
+
+func Main() {
+	flag.Parse()
+
+	if *listFlag {
+		list()
+	}
+
+	if *listBundlesFlag {
+		listBundles()
+	}
+
+	if *detectOSFlag {
+		detectOS()
+	}
+
+	if *installFlag {
+		runInstaller(doInstall)
+	}
+
+	if *uninstallFlag {
+		runInstaller(doUninstall)
+	}
+
+	if *previewOSChangesFlag {
+		previewOSChanges()
+	}
+}
+
+func list() {
+	for _, os := range ListSupportedOS() {
+		for _, k8s := range ListSupportedK8s(os) {
+			fmt.Printf("%s %s\n", os, k8s)
+		}
+	}
+}
+
+func listBundles() {
+	for _, os := range ListSupportedOS() {
+		for _, k8s := range ListSupportedK8s(os) {
+			fmt.Println(GetBundleName(os, k8s))
+		}
+	}
+}
+
+func detectOS() {
+	osd := osDetector{}
+	os, err := osd.Detect()
+	if err != nil {
+		fmt.Printf("Error detecting OS %s", err)
+		return
+	}
+
+	fmt.Printf("Detected OS as: %s", os)
+}
+
+func runInstaller(install bool) {
+	klog.InitFlags(nil)
+	klogger := klogr.New()
+
+	if *bundleRepoFlag == "" {
+		bd := bundleDownloader{"", "."}
+		fmt.Printf("Bundle repo not specified. Provide bundle contents in %s\n", bd.GetBundleDirPath(*k8sFlag))
+	}
+
+	var i *installer
+	var err error
+	if *osFlag != "" {
+		// Override current OS detection
+		i, err = newUnchecked(*osFlag, *bundleRepoFlag, ".", klogger, &logPrinter{klogger})
+		if err != nil {
+			fmt.Println(err)
+			return
+		}
+	} else {
+		i, err = New("norepo", ".", klogger)
+		if err != nil {
+			fmt.Println(err)
+			return
+		}
+
+		// Override preview mode
+		i.downloadPath = "."
+		i.repoAddr = *bundleRepoFlag
+	}
+
+	if install {
+		err = i.Install(*k8sFlag)
+	} else {
+		err = i.Uninstall(*k8sFlag)
+	}
+	if err != nil {
+		fmt.Println(err)
+	}
+}
+
+func previewOSChanges() {
+	installChanges, uninstallChanges, err := PreviewChanges(*osFlag, *k8sFlag)
+	if err != nil {
+		fmt.Printf("Error previewing changes for os '%s' k8s '%s' %s", *osFlag, *k8sFlag, err)
+		return
+	}
+
+	fmt.Printf("Install changes:\n%s\n\n", installChanges)
+	fmt.Printf("Uninstall changes:\n%s", uninstallChanges)
+}

agent/installer/cli/main.go

@@ -0,0 +1,12 @@
+// Copyright 2021 VMware, Inc. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+package main
+
+import (
+	"github.com/vmware-tanzu/cluster-api-provider-byoh/agent/installer"
+)
+
+func main() {
+	installer.Main()
+}