1 files changed, 54 insertions, 0 deletions
diff --git a/misc/reboot/reboot_test.go b/misc/reboot/reboot_test.go
new file mode 100644
index 0000000..a134aff
--- /dev/null
+++ b/misc/reboot/reboot_test.go
@@ -0,0 +1,54 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package reboot_test verifies that the current GOROOT can be used to bootstrap
+// itself.
+package reboot_test
+
+import (
+	"os"
+	"os/exec"
+	"path/filepath"
+	"runtime"
+	"testing"
+	"time"
+)
+
+func TestRepeatBootstrap(t *testing.T) {
+	if testing.Short() {
+		t.Skipf("skipping test that rebuilds the entire toolchain")
+	}
+
+	goroot := t.TempDir()
+
+	gorootSrc := filepath.Join(goroot, "src")
+	overlayStart := time.Now()
+	if err := overlayDir(gorootSrc, filepath.Join(runtime.GOROOT(), "src")); err != nil {
+		t.Fatal(err)
+	}
+	t.Logf("GOROOT/src overlay set up in %s", time.Since(overlayStart))
+
+	if err := os.WriteFile(filepath.Join(goroot, "VERSION"), []byte(runtime.Version()), 0666); err != nil {
+		t.Fatal(err)
+	}
+
+	var makeScript string
+	switch runtime.GOOS {
+	case "windows":
+		makeScript = "make.bat"
+	case "plan9":
+		makeScript = "make.rc"
+	default:
+		makeScript = "make.bash"
+	}
+
+	cmd := exec.Command(filepath.Join(runtime.GOROOT(), "src", makeScript))
+	cmd.Dir = gorootSrc
+	cmd.Env = append(os.Environ(), "GOROOT=", "GOROOT_BOOTSTRAP="+runtime.GOROOT())
+	cmd.Stderr = os.Stderr
+	cmd.Stdout = os.Stdout
+	if err := cmd.Run(); err != nil {
+		t.Fatal(err)
+	}
+}