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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
package bootstrap_test
import (
"bytes"
"errors"
"internal/testenv"
"os"
"os/exec"
"path/filepath"
"runtime"
"testing"
)
// TestExperimentToolID 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 go.dev/issue/33091.
func TestExperimentToolID(t *testing.T) {
if testing.Short() {
t.Skip("skipping test that rebuilds the entire toolchain twice")
}
switch runtime.GOOS {
case "android", "ios", "js", "wasip1":
t.Skipf("skipping because the toolchain does not have to bootstrap on GOOS=%s", runtime.GOOS)
}
realGoroot := testenv.GOROOT(t)
// Set up GOROOT.
goroot := t.TempDir()
gorootSrc := filepath.Join(goroot, "src")
if err := overlayDir(gorootSrc, filepath.Join(realGoroot, "src")); err != nil {
t.Fatal(err)
}
gorootLib := filepath.Join(goroot, "lib")
if err := overlayDir(gorootLib, filepath.Join(realGoroot, "lib")); 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="+realGoroot)
// Use a clean cache.
gocache := t.TempDir()
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(realGoroot, "src", makeScript)
runCmd(t, gorootSrc, env, makeScriptPath)
// Verify compiler version string.
goCmdPath := filepath.Join(goroot, "bin", "go")
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 is unexpected:\ngot %q\nwant %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`)
if !bytes.Equal(gotVersion, wantVersion) {
t.Errorf("compile version with experiment is unexpected:\ngot %q\nwant %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 {
if ee := (*exec.ExitError)(nil); errors.As(err, &ee) {
out = append(out, ee.Stderr...)
}
t.Fatalf("%s failed:\n%s\n%s", cmd, out, err)
}
return out
}