Auto init via environment variables support, qu init for systemd

internal/cli/serve.go

@@ -2,6 +2,9 @@ package cli
 
 import (
 	"context"
+	"errors"
+	"fmt"
+	"io/fs"
 	"log"
 	"os"
 	"os/signal"
@@ -9,6 +12,7 @@ import (
 
 	"github.com/spf13/cobra"
 
+	"git.cer.sh/axodouble/quptime/internal/config"
 	"git.cer.sh/axodouble/quptime/internal/daemon"
 )
 
@@ -18,9 +22,18 @@ func addServeCmd(root *cobra.Command) {
 		Short: "Run the qu daemon in the foreground",
 		Long: `Run the qu daemon: starts the inter-node listener, the local
 control socket for the CLI, the heartbeat loop and the check
-scheduler. Stops cleanly on SIGINT or SIGTERM.`,
+scheduler. Stops cleanly on SIGINT or SIGTERM.
+
+If node.yaml does not exist yet, serve will bootstrap it using values
+from the QUPTIME_* environment variables (see docs/configuration.md).
+This makes a single ` + "`docker compose up`" + ` enough to launch a new node —
+no separate ` + "`qu init`" + ` step is required when the data volume is
+fresh.`,
 		RunE: func(cmd *cobra.Command, args []string) error {
 			logger := log.New(os.Stderr, "quptime: ", log.LstdFlags|log.Lmsgprefix)
+			if err := autoInitIfNeeded(cmd, logger); err != nil {
+				return err
+			}
 			d, err := daemon.New(logger)
 			if err != nil {
 				return err
@@ -32,3 +45,39 @@ scheduler. Stops cleanly on SIGINT or SIGTERM.`,
 	}
 	root.AddCommand(cmd)
 }
+
+// autoInitIfNeeded bootstraps the node on first launch.
+//
+// Friction this removes for container deploys: before, the operator
+// had to `docker compose run --rm quptime init …` once before the
+// service could come up, which makes `restart: unless-stopped`
+// awkward and forces an out-of-band step into every fresh volume.
+// Now serve auto-runs the same bootstrap path using QUPTIME_* env
+// vars when node.yaml is absent, so the compose file can come up on
+// the first try.
+//
+// Pre-existing node.yaml is left untouched — we only bootstrap when
+// the file is genuinely missing. Any other stat error (permission
+// denied, broken symlink) is surfaced so the operator sees the real
+// problem instead of a confused auto-init attempt clobbering state.
+func autoInitIfNeeded(cmd *cobra.Command, logger *log.Logger) error {
+	_, err := os.Stat(config.NodeFilePath())
+	if err == nil {
+		return nil
+	}
+	if !errors.Is(err, fs.ErrNotExist) {
+		return fmt.Errorf("stat node.yaml: %w", err)
+	}
+
+	logger.Printf("node.yaml not found at %s — bootstrapping from environment", config.NodeFilePath())
+	n := &config.NodeConfig{}
+	if err := n.ApplyEnvOverrides(); err != nil {
+		return err
+	}
+	if _, generated, err := bootstrapNode(n); err != nil {
+		return fmt.Errorf("auto-init: %w", err)
+	} else {
+		printBootstrapResult(cmd.OutOrStderr(), n, generated)
+	}
+	return nil
+}