flux2/cmd/tk/main.go

/*
Copyright 2020 The Flux CD contributors.

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 (
	"log"
	"os"
	"path/filepath"
	"time"

	"github.com/spf13/cobra"
	"github.com/spf13/cobra/doc"
	_ "k8s.io/client-go/plugin/pkg/client/auth"
)

var VERSION = "0.0.0-dev.0"

var rootCmd = &cobra.Command{
	Use:           "tk",
	Version:       VERSION,
	SilenceUsage:  true,
	SilenceErrors: true,
	Short:         "Command line utility for assembling Kubernetes CD pipelines",
	Long:          `Command line utility for assembling Kubernetes CD pipelines the GitOps way.`,
	Example: `  # Check prerequisites 
  tk check --pre

  # Install the latest version of the toolkit
  tk install --version=master

  # Create a source from a public Git repository
  tk create source git webapp-latest \
    --url=https://github.com/stefanprodan/podinfo \
    --branch=master \
    --interval=3m

  # List GitRepository sources and their status
  tk get sources git

  # Trigger a GitRepository source sync
  tk sync source git webapp-latest

  # Export GitRepository sources in YAML format
  tk export source git --all > sources.yaml

  # Create a Kustomization for deploying a series of microservices
  tk create kustomization webapp-dev \
    --source=webapp-latest \
    --path="./deploy/webapp/" \
    --prune=true \
    --interval=5m \
    --validate=client \
    --health-check="Deployment/backend.webapp" \
    --health-check="Deployment/frontend.webapp" \
    --health-check-timeout=2m

  # Trigger a git sync of the Kustomization's source and apply changes
  tk sync kustomization webapp-dev --with-source

  # Suspend a Kustomization reconciliation
  tk suspend kustomization webapp-dev

  # Export Kustomizations in YAML format
  tk export kustomization --all > kustomizations.yaml

  # Resume a Kustomization reconciliation
  tk resume kustomization webapp-dev

  # Delete a Kustomization
  tk delete kustomization webapp-dev

  # Delete a GitRepository source
  tk delete source git webapp-latest

  # Uninstall the toolkit and delete CRDs
  tk uninstall --crds
`,
}

var (
	kubeconfig   string
	namespace    string
	timeout      time.Duration
	verbose      bool
	components   []string
	utils        Utils
	pollInterval = 2 * time.Second
)

func init() {
	rootCmd.PersistentFlags().StringVarP(&namespace, "namespace", "", "gitops-system",
		"the namespace scope for this operation")
	rootCmd.PersistentFlags().DurationVarP(&timeout, "timeout", "", 5*time.Minute,
		"timeout for this operation")
	rootCmd.PersistentFlags().BoolVarP(&verbose, "verbose", "", false,
		"print generated objects")
	rootCmd.PersistentFlags().StringSliceVar(&components, "components",
		[]string{"source-controller", "kustomize-controller"},
		"list of components, accepts comma-separated values")
}

func main() {
	log.SetFlags(0)
	generateDocs()
	kubeconfigFlag()
	if err := rootCmd.Execute(); err != nil {
		logFailure("%v", err)
		os.Exit(1)
	}
}

func kubeconfigFlag() {
	if home := homeDir(); home != "" {
		rootCmd.PersistentFlags().StringVarP(&kubeconfig, "kubeconfig", "", filepath.Join(home, ".kube", "config"),
			"path to the kubeconfig file")
	} else {
		rootCmd.PersistentFlags().StringVarP(&kubeconfig, "kubeconfig", "", "",
			"absolute path to the kubeconfig file")
	}

	if len(os.Getenv("KUBECONFIG")) > 0 {
		kubeconfig = os.Getenv("KUBECONFIG")
	}
}

func generateDocs() {
	args := os.Args[1:]
	if len(args) > 0 && args[0] == "docgen" {
		rootCmd.PersistentFlags().StringVarP(&kubeconfig, "kubeconfig", "", "~/.kube/config",
			"path to the kubeconfig file")
		rootCmd.DisableAutoGenTag = true
		err := doc.GenMarkdownTree(rootCmd, "./docs/cmd")
		if err != nil {
			log.Fatal(err)
		}
		os.Exit(0)
	}
}

func homeDir() string {
	if h := os.Getenv("HOME"); h != "" {
		return h
	}
	return os.Getenv("USERPROFILE") // windows
}