feat: implemented token auth

.env.example

@@ -49,6 +49,17 @@ DNS_REPO_BRANCH=main
 # Git remote name.
 DNS_REPO_REMOTE=origin
 
+# Optional HTTPS token auth for git pull/push (when remote URL is https://...)
+# If GIT_AUTH_TOKEN is set, watcher enables non-interactive GIT_ASKPASS mode.
+# GitHub example:
+#   GIT_AUTH_USERNAME=x-access-token
+#   GIT_AUTH_TOKEN=ghp_xxx
+# GitLab example:
+#   GIT_AUTH_USERNAME=oauth2
+#   GIT_AUTH_TOKEN=glpat-xxx
+GIT_AUTH_USERNAME=x-access-token
+GIT_AUTH_TOKEN=
+
 # Directory inside the repository where dynamic zone files are stored.
 # The watcher will only write to this directory; static zones are left untouched.
 DNS_REPO_DYNAMIC_DIR=zones-dynamic

config.go

@@ -14,6 +14,9 @@ type Config struct {
 	TraefikUsername string
 	TraefikPassword string
 
+	GitAuthUsername string
+	GitAuthToken    string
+
 	Zones      []string
 	PublicIP   string
 	PublicIPv6 string // empty = no AAAA records
@@ -41,6 +44,11 @@ func LoadConfig() (*Config, error) {
 	cfg.TraefikUsername = os.Getenv("TRAEFIK_USERNAME")
 	cfg.TraefikPassword = os.Getenv("TRAEFIK_PASSWORD")
 
+	// Optional HTTPS git authentication credentials.
+	// If GIT_AUTH_TOKEN is set, git commands will run non-interactively via GIT_ASKPASS.
+	cfg.GitAuthUsername = envOrDefault("GIT_AUTH_USERNAME", "x-access-token")
+	cfg.GitAuthToken = os.Getenv("GIT_AUTH_TOKEN")
+
 	zonesStr := os.Getenv("DNS_ZONES")
 	if zonesStr == "" {
 		return nil, fmt.Errorf("DNS_ZONES is required (comma-separated list of zones, e.g. example.com,example.net)")

git.go

@@ -3,14 +3,21 @@ package main
 import (
 	"bytes"
 	"fmt"
+	"os"
 	"os/exec"
 	"strings"
 )
 
 // gitRun executes a git command in repoPath, returning a descriptive error
 // that includes the combined stdout+stderr on failure.
-func gitRun(repoPath string, args ...string) error {
-	cmd := exec.Command("git", append([]string{"-C", repoPath}, args...)...)
+func gitRun(cfg *Config, args ...string) error {
+	env, err := gitCommandEnv(cfg)
+	if err != nil {
+		return err
+	}
+
+	cmd := exec.Command("git", append([]string{"-C", cfg.RepoPath}, args...)...)
+	cmd.Env = env
 	out, err := cmd.CombinedOutput()
 	if err != nil {
 		return fmt.Errorf("git %s: %w\n%s",
@@ -20,8 +27,14 @@ func gitRun(repoPath string, args ...string) error {
 }
 
 // gitOutput executes a git command and returns its stdout as a string.
-func gitOutput(repoPath string, args ...string) (string, error) {
-	cmd := exec.Command("git", append([]string{"-C", repoPath}, args...)...)
+func gitOutput(cfg *Config, args ...string) (string, error) {
+	env, err := gitCommandEnv(cfg)
+	if err != nil {
+		return "", err
+	}
+
+	cmd := exec.Command("git", append([]string{"-C", cfg.RepoPath}, args...)...)
+	cmd.Env = env
 	out, err := cmd.Output()
 	if err != nil {
 		var stderr []byte
@@ -34,14 +47,38 @@ func gitOutput(repoPath string, args ...string) (string, error) {
 	return string(out), nil
 }
 
+// gitCommandEnv builds the environment for git subprocesses.
+// If GIT_AUTH_TOKEN is provided, non-interactive HTTPS auth is enabled via askpass.
+func gitCommandEnv(cfg *Config) ([]string, error) {
+	env := os.Environ()
+	if cfg.GitAuthToken == "" {
+		return env, nil
+	}
+
+	exePath, err := os.Executable()
+	if err != nil {
+		return nil, fmt.Errorf("resolve executable path for GIT_ASKPASS: %w", err)
+	}
+
+	env = append(env,
+		"GIT_TERMINAL_PROMPT=0",
+		"GIT_ASKPASS_REQUIRE=force",
+		"GIT_ASKPASS="+exePath,
+		"TDW_GIT_ASKPASS=1",
+		"GIT_AUTH_USERNAME="+cfg.GitAuthUsername,
+		"GIT_AUTH_TOKEN="+cfg.GitAuthToken,
+	)
+	return env, nil
+}
+
 // GitPull fetches from the remote and rebases the local branch.
 // Using --autostash ensures any uncommitted changes are preserved across the rebase
 // (should not normally happen but guards against manual edits).
 func GitPull(cfg *Config) error {
-	if err := gitRun(cfg.RepoPath, "fetch", "--prune", cfg.RepoRemote); err != nil {
+	if err := gitRun(cfg, "fetch", "--prune", cfg.RepoRemote); err != nil {
 		return fmt.Errorf("git fetch: %w", err)
 	}
-	if err := gitRun(cfg.RepoPath,
+	if err := gitRun(cfg,
 		"pull", "--rebase", "--autostash",
 		cfg.RepoRemote, cfg.RepoBranch,
 	); err != nil {
@@ -52,7 +89,7 @@ func GitPull(cfg *Config) error {
 
 // GitStatusChanged reports true when the working tree has uncommitted changes.
 func GitStatusChanged(cfg *Config) (bool, error) {
-	out, err := gitOutput(cfg.RepoPath, "status", "--porcelain")
+	out, err := gitOutput(cfg, "status", "--porcelain")
 	if err != nil {
 		return false, err
 	}
@@ -63,17 +100,17 @@ func GitStatusChanged(cfg *Config) (bool, error) {
 // and pushes to the configured remote branch.
 // Author identity is passed via git -c flags to avoid requiring global git config.
 func GitCommitAndPush(cfg *Config, message string) error {
-	if err := gitRun(cfg.RepoPath, "add", cfg.DynamicDir); err != nil {
+	if err := gitRun(cfg, "add", cfg.DynamicDir); err != nil {
 		return fmt.Errorf("git add: %w", err)
 	}
-	if err := gitRun(cfg.RepoPath,
+	if err := gitRun(cfg,
 		"-c", "user.name="+cfg.AuthorName,
 		"-c", "user.email="+cfg.AuthorEmail,
 		"commit", "-m", message,
 	); err != nil {
 		return fmt.Errorf("git commit: %w", err)
 	}
-	if err := gitRun(cfg.RepoPath, "push", cfg.RepoRemote, cfg.RepoBranch); err != nil {
+	if err := gitRun(cfg, "push", cfg.RepoRemote, cfg.RepoBranch); err != nil {
 		return fmt.Errorf("git push: %w", err)
 	}
 	return nil

main.go

@@ -11,12 +11,17 @@ import (
 	"net/url"
 	"os"
 	"os/signal"
+	"strconv"
 	"strings"
 	"syscall"
 	"time"
 )
 
 func main() {
+	if maybeHandleGitAskpass() {
+		return
+	}
+
 	slog.SetDefault(slog.New(slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{
 		Level: slog.LevelInfo,
 	})))
@@ -32,8 +37,11 @@ func main() {
 		"zones", cfg.Zones,
 		"repo_path", cfg.RepoPath,
 		"dynamic_dir", cfg.DynamicDir,
+		"git_https_token_enabled", cfg.GitAuthToken != "",
+		"git_auth_username", cfg.GitAuthUsername,
 		"reconcile_interval", cfg.ReconcileInterval,
 		"debounce_delay", cfg.DebounceDelay,
+		"cf_auto_ttl", cfg.CloudflareAutoTTL,
 	)
 
 	ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGTERM, syscall.SIGINT)
@@ -107,6 +115,29 @@ func main() {
 	slog.Info("traefik-dns-watcher stopped")
 }
 
+// maybeHandleGitAskpass serves username/password for git HTTPS auth in non-interactive mode.
+// This process mode is only enabled for git child processes that set TDW_GIT_ASKPASS=1.
+func maybeHandleGitAskpass() bool {
+	enabled, _ := strconv.ParseBool(os.Getenv("TDW_GIT_ASKPASS"))
+	if !enabled {
+		return false
+	}
+
+	prompt := ""
+	if len(os.Args) > 1 {
+		prompt = strings.ToLower(os.Args[1])
+	}
+
+	if strings.Contains(prompt, "username") {
+		fmt.Fprint(os.Stdout, os.Getenv("GIT_AUTH_USERNAME"))
+		return true
+	}
+
+	// For password/token prompts, return token by default.
+	fmt.Fprint(os.Stdout, os.Getenv("GIT_AUTH_TOKEN"))
+	return true
+}
+
 // watchDockerEvents connects to the Docker daemon and forwards container lifecycle
 // events to the trigger function. Reconnects with exponential backoff on failure.
 func watchDockerEvents(ctx context.Context, trigger func()) {