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// 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.
//go:build explicit
// +build explicit
// Package experiment_toolid_test verifies that GOEXPERIMENT settings built
// into the toolchain influence tool ids in the Go command.
// This test requires bootstrapping the toolchain twice, so it's very expensive.
// It must be run explicitly with -tags=explicit.
// Verifies golang.org/issue/33091.
package reboot_test
import (
"bytes"
"os"
"os/exec"
"path/filepath"
"runtime"
"testing"
)
func TestExperimentToolID(t *testing.T) {
// Set up GOROOT
goroot, err := os.MkdirTemp("", "experiment-goroot")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(goroot)
gorootSrc := filepath.Join(goroot, "src")
if err := overlayDir(gorootSrc, filepath.Join(runtime.GOROOT(), "src")); err != nil {
t.Fatal(err)
}
if err := os.WriteFile(filepath.Join(goroot, "VERSION"), []byte("go1.999"), 0666); err != nil {
t.Fatal(err)
}
env := append(os.Environ(), "GOROOT=", "GOROOT_BOOTSTRAP="+runtime.GOROOT())
// Use a clean cache.
gocache, err := os.MkdirTemp("", "experiment-gocache")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(gocache)
env = append(env, "GOCACHE="+gocache)
// Build the toolchain without GOEXPERIMENT.
var makeScript string
switch runtime.GOOS {
case "windows":
makeScript = "make.bat"
case "plan9":
makeScript = "make.rc"
default:
makeScript = "make.bash"
}
makeScriptPath := filepath.Join(runtime.GOROOT(), "src", makeScript)
runCmd(t, gorootSrc, env, makeScriptPath)
// Verify compiler version string.
goCmdPath := filepath.Join(goroot, "bin", "go")
if runtime.GOOS == "windows" {
goCmdPath += ".exe"
}
gotVersion := bytes.TrimSpace(runCmd(t, gorootSrc, env, goCmdPath, "tool", "compile", "-V=full"))
wantVersion := []byte(`compile version go1.999`)
if !bytes.Equal(gotVersion, wantVersion) {
t.Errorf("compile version without experiment: got %q, want %q", gotVersion, wantVersion)
}
// Build a package in a mode not handled by the make script.
runCmd(t, gorootSrc, env, goCmdPath, "build", "-race", "archive/tar")
// Rebuild the toolchain with GOEXPERIMENT.
env = append(env, "GOEXPERIMENT=fieldtrack")
runCmd(t, gorootSrc, env, makeScriptPath)
// Verify compiler version string.
gotVersion = bytes.TrimSpace(runCmd(t, gorootSrc, env, goCmdPath, "tool", "compile", "-V=full"))
wantVersion = []byte(`compile version go1.999 X:fieldtrack,framepointer`)
if !bytes.Equal(gotVersion, wantVersion) {
t.Errorf("compile version with experiment: got %q, want %q", gotVersion, wantVersion)
}
// Build the same package. We should not get a cache conflict.
runCmd(t, gorootSrc, env, goCmdPath, "build", "-race", "archive/tar")
}
func runCmd(t *testing.T, dir string, env []string, path string, args ...string) []byte {
cmd := exec.Command(path, args...)
cmd.Dir = dir
cmd.Env = env
out, err := cmd.Output()
if err != nil {
t.Fatal(err)
}
return out
}
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