mirror of
https://github.com/tailscale/tailscale.git
synced 2024-12-12 19:24:40 +00:00
348 lines
8.2 KiB
Go
348 lines
8.2 KiB
Go
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// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package winutil
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import (
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"bytes"
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"errors"
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"fmt"
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"os"
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"os/exec"
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"path/filepath"
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"runtime"
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"strings"
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"sync"
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"testing"
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)
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// The code in this file is adapted from internal/testenv in the Go source tree
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// and is used for writing tests that require spawning subprocesses.
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var toRemove []string
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func TestMain(m *testing.M) {
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status := m.Run()
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for _, file := range toRemove {
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os.RemoveAll(file)
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}
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os.Exit(status)
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}
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var testprog struct {
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sync.Mutex
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dir string
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target map[string]*buildexe
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}
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type buildexe struct {
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once sync.Once
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exe string
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err error
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}
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func pathToTestProg(t *testing.T, binary string) string {
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exe, err := buildTestProg(t, binary, "-buildvcs=false")
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if err != nil {
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t.Fatal(err)
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}
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return exe
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}
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func startTestProg(t *testing.T, binary, name string, env ...string) {
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exe, err := buildTestProg(t, binary, "-buildvcs=false")
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if err != nil {
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t.Fatal(err)
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}
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startBuiltTestProg(t, exe, name, env...)
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}
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func startBuiltTestProg(t *testing.T, exe, name string, env ...string) {
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cmd := exec.Command(exe, name)
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cmd.Env = append(cmd.Env, env...)
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if testing.Short() {
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cmd.Env = append(cmd.Env, "RUNTIME_TEST_SHORT=1")
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}
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start(t, cmd)
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}
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var serializeBuild = make(chan bool, 2)
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func buildTestProg(t *testing.T, binary string, flags ...string) (string, error) {
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testprog.Lock()
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if testprog.dir == "" {
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dir, err := os.MkdirTemp("", "go-build")
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if err != nil {
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t.Fatalf("failed to create temp directory: %v", err)
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}
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testprog.dir = dir
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toRemove = append(toRemove, dir)
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}
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if testprog.target == nil {
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testprog.target = make(map[string]*buildexe)
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}
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name := binary
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if len(flags) > 0 {
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nameFlags := make([]string, 0, len(flags))
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for _, flag := range flags {
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nameFlags = append(nameFlags, strings.ReplaceAll(flag, "=", "_"))
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}
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name += "_" + strings.Join(nameFlags, "_")
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}
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target, ok := testprog.target[name]
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if !ok {
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target = &buildexe{}
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testprog.target[name] = target
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}
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dir := testprog.dir
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// Unlock testprog while actually building, so that other
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// tests can look up executables that were already built.
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testprog.Unlock()
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target.once.Do(func() {
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// Only do two "go build"'s at a time,
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// to keep load from getting too high.
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serializeBuild <- true
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defer func() { <-serializeBuild }()
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// Don't get confused if goToolPath calls t.Skip.
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target.err = errors.New("building test called t.Skip")
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exe := filepath.Join(dir, name+".exe")
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t.Logf("running go build -o %s %s", exe, strings.Join(flags, " "))
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cmd := exec.Command(goToolPath(t), append([]string{"build", "-o", exe}, flags...)...)
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cmd.Dir = "testdata/" + binary
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out, err := cmd.CombinedOutput()
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if err != nil {
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target.err = fmt.Errorf("building %s %v: %v\n%s", binary, flags, err, out)
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} else {
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target.exe = exe
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target.err = nil
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}
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})
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return target.exe, target.err
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}
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// goTool reports the path to the Go tool.
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func goTool() (string, error) {
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if !hasGoBuild() {
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return "", errors.New("platform cannot run go tool")
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}
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exeSuffix := ".exe"
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goroot, err := findGOROOT()
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if err != nil {
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return "", fmt.Errorf("cannot find go tool: %w", err)
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}
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path := filepath.Join(goroot, "bin", "go"+exeSuffix)
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if _, err := os.Stat(path); err == nil {
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return path, nil
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}
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goBin, err := exec.LookPath("go" + exeSuffix)
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if err != nil {
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return "", errors.New("cannot find go tool: " + err.Error())
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}
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return goBin, nil
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}
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// knownEnv is a list of environment variables that affect the operation
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// of the Go command.
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const knownEnv = `
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AR
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CC
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CGO_CFLAGS
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CGO_CFLAGS_ALLOW
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CGO_CFLAGS_DISALLOW
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CGO_CPPFLAGS
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CGO_CPPFLAGS_ALLOW
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CGO_CPPFLAGS_DISALLOW
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CGO_CXXFLAGS
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CGO_CXXFLAGS_ALLOW
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CGO_CXXFLAGS_DISALLOW
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CGO_ENABLED
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CGO_FFLAGS
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CGO_FFLAGS_ALLOW
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CGO_FFLAGS_DISALLOW
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CGO_LDFLAGS
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CGO_LDFLAGS_ALLOW
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CGO_LDFLAGS_DISALLOW
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CXX
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FC
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GCCGO
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GO111MODULE
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GO386
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GOAMD64
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GOARCH
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GOARM
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GOBIN
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GOCACHE
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GOENV
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GOEXE
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GOEXPERIMENT
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GOFLAGS
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GOGCCFLAGS
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GOHOSTARCH
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GOHOSTOS
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GOINSECURE
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GOMIPS
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GOMIPS64
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GOMODCACHE
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GONOPROXY
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GONOSUMDB
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GOOS
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GOPATH
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GOPPC64
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GOPRIVATE
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GOPROXY
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GOROOT
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GOSUMDB
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GOTMPDIR
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GOTOOLDIR
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GOVCS
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GOWASM
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GOWORK
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GO_EXTLINK_ENABLED
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PKG_CONFIG
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`
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// goToolPath reports the path to the Go tool.
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// It is a convenience wrapper around goTool.
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// If the tool is unavailable goToolPath calls t.Skip.
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// If the tool should be available and isn't, goToolPath calls t.Fatal.
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func goToolPath(t testing.TB) string {
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mustHaveGoBuild(t)
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path, err := goTool()
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if err != nil {
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t.Fatal(err)
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}
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// Add all environment variables that affect the Go command to test metadata.
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// Cached test results will be invalidate when these variables change.
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// See golang.org/issue/32285.
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for _, envVar := range strings.Fields(knownEnv) {
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os.Getenv(envVar)
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}
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return path
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}
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// hasGoBuild reports whether the current system can build programs with “go build”
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// and then run them with os.StartProcess or exec.Command.
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func hasGoBuild() bool {
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if os.Getenv("GO_GCFLAGS") != "" {
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// It's too much work to require every caller of the go command
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// to pass along "-gcflags="+os.Getenv("GO_GCFLAGS").
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// For now, if $GO_GCFLAGS is set, report that we simply can't
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// run go build.
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return false
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}
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return true
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}
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// mustHaveGoBuild checks that the current system can build programs with “go build”
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// and then run them with os.StartProcess or exec.Command.
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// If not, mustHaveGoBuild calls t.Skip with an explanation.
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func mustHaveGoBuild(t testing.TB) {
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if os.Getenv("GO_GCFLAGS") != "" {
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t.Skipf("skipping test: 'go build' not compatible with setting $GO_GCFLAGS")
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}
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if !hasGoBuild() {
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t.Skipf("skipping test: 'go build' not available on %s/%s", runtime.GOOS, runtime.GOARCH)
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}
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}
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var (
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gorootOnce sync.Once
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gorootPath string
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gorootErr error
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)
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func findGOROOT() (string, error) {
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gorootOnce.Do(func() {
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gorootPath = runtime.GOROOT()
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if gorootPath != "" {
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// If runtime.GOROOT() is non-empty, assume that it is valid.
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//
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// (It might not be: for example, the user may have explicitly set GOROOT
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// to the wrong directory, or explicitly set GOROOT_FINAL but not GOROOT
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// and hasn't moved the tree to GOROOT_FINAL yet. But those cases are
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// rare, and if that happens the user can fix what they broke.)
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return
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}
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// runtime.GOROOT doesn't know where GOROOT is (perhaps because the test
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// binary was built with -trimpath, or perhaps because GOROOT_FINAL was set
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// without GOROOT and the tree hasn't been moved there yet).
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//
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// Since this is internal/testenv, we can cheat and assume that the caller
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// is a test of some package in a subdirectory of GOROOT/src. ('go test'
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// runs the test in the directory containing the packaged under test.) That
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// means that if we start walking up the tree, we should eventually find
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// GOROOT/src/go.mod, and we can report the parent directory of that.
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cwd, err := os.Getwd()
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if err != nil {
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gorootErr = fmt.Errorf("finding GOROOT: %w", err)
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return
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}
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dir := cwd
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for {
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parent := filepath.Dir(dir)
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if parent == dir {
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// dir is either "." or only a volume name.
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gorootErr = fmt.Errorf("failed to locate GOROOT/src in any parent directory")
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return
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}
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if base := filepath.Base(dir); base != "src" {
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dir = parent
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continue // dir cannot be GOROOT/src if it doesn't end in "src".
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}
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b, err := os.ReadFile(filepath.Join(dir, "go.mod"))
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if err != nil {
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if os.IsNotExist(err) {
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dir = parent
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continue
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}
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gorootErr = fmt.Errorf("finding GOROOT: %w", err)
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return
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}
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goMod := string(b)
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for goMod != "" {
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var line string
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line, goMod, _ = strings.Cut(goMod, "\n")
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fields := strings.Fields(line)
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if len(fields) >= 2 && fields[0] == "module" && fields[1] == "std" {
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// Found "module std", which is the module declaration in GOROOT/src!
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gorootPath = parent
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return
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}
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}
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}
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})
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return gorootPath, gorootErr
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}
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// start runs cmd asynchronously and returns immediately.
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func start(t testing.TB, cmd *exec.Cmd) {
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args := cmd.Args
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if args == nil {
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args = []string{cmd.Path}
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}
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var b bytes.Buffer
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cmd.Stdout = &b
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cmd.Stderr = &b
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if err := cmd.Start(); err != nil {
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t.Fatalf("starting %s: %v", args, err)
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}
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}
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