cmd/k8s-operator: generate static kube manifests from the Helm chart. (#10436)

* cmd/k8s-operator: generate static manifests from Helm charts This is done to ensure that there is a single source of truth for the operator kube manifests. Also adds linux node selector to the static manifests as this was added as a default to the Helm chart. Static manifests can now be generated by running `go generate tailscale.com/cmd/k8s-operator`. Updates tailscale/tailscale#9222 Signed-off-by: Irbe Krumina <irbe@tailscale.com>
2023-12-04 10:18:07 +00:00
parent 263e01c47b
commit 49fd0a62c9
10 changed files with 270 additions and 142 deletions
@@ -0,0 +1,74 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+//go:build !plan9
+
+package main
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+
+	"gopkg.in/yaml.v3"
+)
+
+func main() {
+	repoRoot := "../../"
+	cmd := exec.Command("./tool/helm", "template", "operator", "./cmd/k8s-operator/deploy/chart",
+		"--namespace=tailscale")
+	cmd.Dir = repoRoot
+	var out bytes.Buffer
+	cmd.Stdout = &out
+	cmd.Stderr = os.Stderr
+	if err := cmd.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)
+	}
+}