Second checkpoint

internal/cli/root.go

@@ -0,0 +1,37 @@
+// Package cli defines the cobra command tree for the gis binary: serve, worker,
+// and migrate.
+package cli
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"os/signal"
+	"syscall"
+
+	"github.com/spf13/cobra"
+)
+
+var rootCmd = &cobra.Command{
+	Use:           "gis",
+	Short:         "GIS application server, worker, and migration tool",
+	SilenceUsage:  true,
+	SilenceErrors: true,
+}
+
+// Execute runs the root command, exiting non-zero on error.
+func Execute() {
+	if err := rootCmd.Execute(); err != nil {
+		fmt.Fprintln(os.Stderr, "error:", err)
+		os.Exit(1)
+	}
+}
+
+func init() {
+	rootCmd.AddCommand(serveCmd, workerCmd, migrateCmd)
+}
+
+// signalContext returns a context cancelled on SIGINT or SIGTERM.
+func signalContext() (context.Context, context.CancelFunc) {
+	return signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
+}