apply.go

package apply

import (
	"fmt"
	"os"
	"strings"

	"github.com/jenkins-x-plugins/jx-gitops/pkg/rootcmd"
	"github.com/jenkins-x/jx-helpers/v3/pkg/cmdrunner"
	"github.com/jenkins-x/jx-helpers/v3/pkg/cobras/helper"
	"github.com/jenkins-x/jx-helpers/v3/pkg/cobras/templates"
	"github.com/jenkins-x/jx-helpers/v3/pkg/gitclient"
	"github.com/jenkins-x/jx-helpers/v3/pkg/gitclient/cli"
	"github.com/jenkins-x/jx-helpers/v3/pkg/termcolor"
	"github.com/jenkins-x/jx-logging/v3/pkg/log"
	"github.com/pkg/errors"
	"github.com/spf13/cobra"
)

var (
	info = termcolor.ColorInfo

	cmdLong = templates.LongDesc(`
		Performs a gitops regeneration and apply on a cluster git repository

		If the last commit was a merge from a pull request the regeneration is skipped.

		Also the process detects if an ingress has changed (or similar changes) and retriggers another regeneration which typically is only required when installing for the first time or if no explicit domain name is being used and the LoadBalancer service has been removed.
`)

	cmdExample = templates.Examples(`
		# performs a regeneration and apply
		%s apply
	`)

	pathSeparator = string(os.PathSeparator)
)

// Options the options for the command
type Options struct {
	Dir              string
	PullRequest      bool
	GitClient        gitclient.Interface
	CommandRunner    cmdrunner.CommandRunner
	GitCommandRunner cmdrunner.CommandRunner
}

// NewCmdApply creates a command object for the command
func NewCmdApply() (*cobra.Command, *Options) {
	o := &Options{}

	cmd := &cobra.Command{
		Use:     "apply",
		Short:   "Performs a GitOps regeneration and apply on a cluster git repository",
		Long:    cmdLong,
		Example: fmt.Sprintf(cmdExample, rootcmd.BinaryName),
		Run: func(cmd *cobra.Command, args []string) {
			err := o.Run()
			helper.CheckErr(err)
		},
	}
	cmd.Flags().StringVarP(&o.Dir, "dir", "d", ".", "the directory to the git and make commands")
	cmd.Flags().BoolVarP(&o.PullRequest, "pull-request", "", false, "specifies to apply the pull request contents into the PR branch")
	return cmd, o
}

// Validate validates the setup
func (o *Options) Validate() error {
	if o.CommandRunner == nil {
		o.CommandRunner = cmdrunner.QuietCommandRunner
	}
	if o.GitClient == nil {
		o.GitClient = cli.NewCLIClient("", o.CommandRunner)
	}
	return nil
}

// Run implements the command
func (o *Options) Run() error {
	err := o.Validate()
	if err != nil {
		return errors.Wrapf(err, "failed to validate")
	}

	lastCommitMessage, err := gitclient.GetLatestCommitMessage(o.GitClient, o.Dir)
	if err != nil {
		return errors.Wrapf(err, "failed to get last commit message")
	}
	lastCommitMessage = strings.TrimSpace(lastCommitMessage)
	log.Logger().Infof("found last commit message: %s", termcolor.ColorStatus(lastCommitMessage))

	if strings.Contains(lastCommitMessage, "/pipeline cancel") {
		log.Logger().Infof("last commit disabled further processing")
		return nil
	}

	if o.PullRequest {
		return o.pullRequest()
	}

	regen := true
	if strings.HasPrefix(lastCommitMessage, "Merge pull request") {
		log.Logger().Infof("last commit was a merge pull request so not regenerating")
		regen = false
	}

	if regen {
		_, err := o.Regenerate()
		if err != nil {
			return errors.Wrapf(err, "failed to regenerate")
		}

		c := &cmdrunner.Command{
			Dir:  o.Dir,
			Name: "make",
			Args: []string{"regen-phase-3"},
		}
		err = o.RunCommand(c)
		if err != nil {
			return errors.Wrapf(err, "failed to regenerate phase 3")
		}
	} else {
		c := &cmdrunner.Command{
			Dir:  o.Dir,
			Name: "make",
			Args: []string{"regen-none"},
		}
		err = o.RunCommand(c)
		if err != nil {
			return errors.Wrapf(err, "failed to run regen-none hook")
		}
	}
	return nil
}

// Regenerate regenerates the kubernetes resources
func (o *Options) Regenerate() (bool, error) {
	firstSha, err := gitclient.GetLatestCommitSha(o.GitClient, o.Dir)
	if err != nil {
		return false, errors.Wrapf(err, "failed to get the last commit sha")
	}

	c := &cmdrunner.Command{
		Dir:  o.Dir,
		Name: "make",
		Args: []string{"regen-phase-1"},
	}
	err = o.RunCommand(c)
	if err != nil {
		return false, errors.Wrapf(err, "failed to regenerate phase 1")
	}

	secondSha, err := gitclient.GetLatestCommitSha(o.GitClient, o.Dir)
	if err != nil {
		return false, errors.Wrapf(err, "failed to get the last commit sha")
	}

	lastCommitMessage, err := gitclient.GetLatestCommitMessage(o.GitClient, o.Dir)
	if err != nil {
		return false, errors.Wrapf(err, "failed to get last commit message")
	}
	lastCommitMessage = strings.TrimSpace(lastCommitMessage)
	log.Logger().Infof("found last commit message: %s", termcolor.ColorStatus(lastCommitMessage))

	if strings.Contains(lastCommitMessage, "/pipeline cancel") && secondSha == firstSha {
		log.Logger().Infof("no commits so skipping regen-phase-2")
		return false, nil
	}

	c = &cmdrunner.Command{
		Dir:  o.Dir,
		Name: "make",
		Args: []string{"regen-phase-2"},
	}
	err = o.RunCommand(c)
	if err != nil {
		return false, errors.Wrapf(err, "failed to regenerate phase 2")
	}
	return true, nil
}

// Run runs the command
func (o *Options) RunCommand(c *cmdrunner.Command) error {
	log.Logger().Info(info(c.CLI()))
	c.Out = os.Stdout
	c.Err = os.Stderr
	_, err := o.CommandRunner(c)
	return err
}

func (o *Options) pullRequest() error {
	c := &cmdrunner.Command{
		Dir:  o.Dir,
		Name: "make",
		Args: []string{"pr-regen"},
	}
	err := o.RunCommand(c)
	if err != nil {
		return errors.Wrapf(err, "failed to regen pr")
	}
	return nil
}