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// Copyright (c) Tailscale Inc & contributors
// SPDX-License-Identifier: BSD-3-Clause
//go:build !plan9
// The generate command creates tailscale.com CRDs.
package main
import (
"bytes"
"fmt"
"io"
"log"
"os"
"os/exec"
"path/filepath"
"strings"
"gopkg.in/yaml.v3"
)
const (
operatorDeploymentFilesPath = "cmd/k8s-operator/deploy"
connectorCRDPath = operatorDeploymentFilesPath + "/crds/tailscale.com_connectors.yaml"
proxyClassCRDPath = operatorDeploymentFilesPath + "/crds/tailscale.com_proxyclasses.yaml"
dnsConfigCRDPath = operatorDeploymentFilesPath + "/crds/tailscale.com_dnsconfigs.yaml"
recorderCRDPath = operatorDeploymentFilesPath + "/crds/tailscale.com_recorders.yaml"
proxyGroupCRDPath = operatorDeploymentFilesPath + "/crds/tailscale.com_proxygroups.yaml"
tailnetCRDPath = operatorDeploymentFilesPath + "/crds/tailscale.com_tailnets.yaml"
proxyGroupPolicyCRDPath = operatorDeploymentFilesPath + "/crds/tailscale.com_proxygrouppolicies.yaml"
helmTemplatesPath = operatorDeploymentFilesPath + "/chart/templates"
connectorCRDHelmTemplatePath = helmTemplatesPath + "/connector.yaml"
proxyClassCRDHelmTemplatePath = helmTemplatesPath + "/proxyclass.yaml"
dnsConfigCRDHelmTemplatePath = helmTemplatesPath + "/dnsconfig.yaml"
recorderCRDHelmTemplatePath = helmTemplatesPath + "/recorder.yaml"
proxyGroupCRDHelmTemplatePath = helmTemplatesPath + "/proxygroup.yaml"
tailnetCRDHelmTemplatePath = helmTemplatesPath + "/tailnet.yaml"
proxyGroupPolicyCRDHelmTemplatePath = helmTemplatesPath + "/proxygrouppolicy.yaml"
helmConditionalStart = "{{ if .Values.installCRDs -}}\n"
helmConditionalEnd = "{{- end -}}"
)
func main() {
if len(os.Args) < 2 {
log.Fatalf("usage ./generate [staticmanifests|helmcrd]")
}
gitOut, err := exec.Command("git", "rev-parse", "--show-toplevel").CombinedOutput()
if err != nil {
log.Fatalf("error determining git root: %v: %s", err, gitOut)
}
repoRoot := strings.TrimSpace(string(gitOut))
switch os.Args[1] {
case "helmcrd": // insert CRDs to Helm templates behind a installCRDs=true conditional check
log.Print("Adding CRDs to Helm templates")
if err := generate(repoRoot); err != nil {
log.Fatalf("error adding CRDs to Helm templates: %v", err)
}
return
case "staticmanifests": // generate static manifests from Helm templates (including the CRD)
default:
log.Fatalf("unknown option %s, known options are 'staticmanifests', 'helmcrd'", os.Args[1])
}
log.Printf("Inserting CRDs Helm templates")
if err := generate(repoRoot); err != nil {
log.Fatalf("error adding CRDs to Helm templates: %v", err)
}
defer func() {
if err := cleanup(repoRoot); err != nil {
log.Fatalf("error cleaning up generated resources")
}
}()
log.Print("Templating Helm chart contents")
helmTmplCmd := exec.Command("./tool/helm", "template", "operator", "./cmd/k8s-operator/deploy/chart",
"--namespace=tailscale", "--set=oauth.clientSecret=''")
helmTmplCmd.Dir = repoRoot
var out bytes.Buffer
helmTmplCmd.Stdout = &out
helmTmplCmd.Stderr = os.Stderr
if err := helmTmplCmd.Run(); err != nil {
log.Fatalf("error templating helm manifests: %v", err)
}
var final bytes.Buffer
templatePath := filepath.Join(repoRoot, "cmd/k8s-operator/deploy/manifests/templates")
fileInfos, err := os.ReadDir(templatePath)
if err != nil {
log.Fatalf("error reading templates: %v", err)
}
for _, fi := range fileInfos {
templateBytes, err := os.ReadFile(filepath.Join(templatePath, fi.Name()))
if err != nil {
log.Fatalf("error reading template: %v", err)
}
final.Write(templateBytes)
}
decoder := yaml.NewDecoder(&out)
for {
var document any
err := decoder.Decode(&document)
if err == io.EOF {
break
}
if err != nil {
log.Fatalf("failed read from input data: %v", err)
}
bytes, err := yaml.Marshal(document)
if err != nil {
log.Fatalf("failed to marshal YAML document: %v", err)
}
if strings.TrimSpace(string(bytes)) == "null" {
continue
}
if _, err = final.Write(bytes); err != nil {
log.Fatalf("error marshaling yaml: %v", err)
}
fmt.Fprint(&final, "---\n")
}
finalString, _ := strings.CutSuffix(final.String(), "---\n")
if err := os.WriteFile(filepath.Join(repoRoot, "cmd/k8s-operator/deploy/manifests/operator.yaml"), []byte(finalString), 0664); err != nil {
log.Fatalf("error writing new file: %v", err)
}
}
// generate places tailscale.com CRDs (currently Connector, ProxyClass, DNSConfig, Recorder) into
// the Helm chart templates behind .Values.installCRDs=true condition (true by
// default).
func generate(baseDir string) error {
addCRDToHelm := func(crdPath, crdTemplatePath string) error {
chartBytes, err := os.ReadFile(filepath.Join(baseDir, crdPath))
if err != nil {
return fmt.Errorf("error reading CRD contents: %w", err)
}
// Place a new temporary Helm template file with the templated CRD
// contents into Helm templates.
file, err := os.Create(filepath.Join(baseDir, crdTemplatePath))
if err != nil {
return fmt.Errorf("error creating CRD template file: %w", err)
}
if _, err := file.Write([]byte(helmConditionalStart)); err != nil {
return fmt.Errorf("error writing helm if statement start: %w", err)
}
if _, err := file.Write(chartBytes); err != nil {
return fmt.Errorf("error writing chart bytes: %w", err)
}
if _, err := file.Write([]byte(helmConditionalEnd)); err != nil {
return fmt.Errorf("error writing helm if-statement end: %w", err)
}
return file.Close()
}
for _, crd := range []struct {
crdPath, templatePath string
}{
{connectorCRDPath, connectorCRDHelmTemplatePath},
{proxyClassCRDPath, proxyClassCRDHelmTemplatePath},
{dnsConfigCRDPath, dnsConfigCRDHelmTemplatePath},
{recorderCRDPath, recorderCRDHelmTemplatePath},
{proxyGroupCRDPath, proxyGroupCRDHelmTemplatePath},
{tailnetCRDPath, tailnetCRDHelmTemplatePath},
{proxyGroupPolicyCRDPath, proxyGroupPolicyCRDHelmTemplatePath},
} {
if err := addCRDToHelm(crd.crdPath, crd.templatePath); err != nil {
return fmt.Errorf("error adding %s CRD to Helm templates: %w", crd.crdPath, err)
}
}
return nil
}
func cleanup(baseDir string) error {
log.Print("Cleaning up CRD from Helm templates")
for _, path := range []string{
connectorCRDHelmTemplatePath,
proxyClassCRDHelmTemplatePath,
dnsConfigCRDHelmTemplatePath,
recorderCRDHelmTemplatePath,
proxyGroupCRDHelmTemplatePath,
tailnetCRDHelmTemplatePath,
proxyGroupPolicyCRDHelmTemplatePath,
} {
if err := os.Remove(filepath.Join(baseDir, path)); err != nil && !os.IsNotExist(err) {
return fmt.Errorf("error cleaning up %s: %w", path, err)
}
}
return nil
}
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