dev: initialize submodules in dev doctor

This commit adds a check to `dev doctor` to initialize submodules, like we do
in our `Makefile`.

Release note: None

pkg/cmd/dev/doctor.go

@@ -13,6 +13,7 @@ package main
 import (
 	"errors"
 	"log"
+	"os"
 	"os/exec"
 	"path/filepath"
 	"runtime"
@@ -99,6 +100,24 @@ Please perform the following steps:
 		}
 	}
 
+	const binDir = "bin"
+	const submodulesMarkerPath = binDir + "/.submodules-initialized"
+	d.log.Println("doctor: running submodules check")
+	if _, err := os.Stat(submodulesMarkerPath); errors.Is(err, os.ErrNotExist) {
+		if _, err = d.exec.CommandContextSilent(ctx, "git", "rev-parse", "--is-inside-work-tree"); err != nil {
+			return err
+		}
+		if _, err = d.exec.CommandContextSilent(ctx, "git", "submodule", "update", "--init", "--recursive"); err != nil {
+			return err
+		}
+		if err = d.os.MkdirAll(binDir); err != nil {
+			return err
+		}
+		if err = d.os.WriteFile(submodulesMarkerPath, ""); err != nil {
+			return err
+		}
+	}
+
 	// Check whether the build is properly configured to use stamping.
 	passedStampTest := true
 	if _, err := d.exec.CommandContextSilent(ctx, "bazel", "build", "//build/bazelutil:test_stamping"); err != nil {