Source file src/google.golang.org/protobuf/integration_test.go

Documentation: google.golang.org/protobuf

     1  // Copyright 2019 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package main
     6  
     7  import (
     8  	"archive/tar"
     9  	"archive/zip"
    10  	"bytes"
    11  	"compress/gzip"
    12  	"crypto/sha256"
    13  	"flag"
    14  	"fmt"
    15  	"io"
    16  	"io/fs"
    17  	"io/ioutil"
    18  	"net/http"
    19  	"os"
    20  	"os/exec"
    21  	"path/filepath"
    22  	"reflect"
    23  	"regexp"
    24  	"runtime"
    25  	"runtime/debug"
    26  	"strings"
    27  	"sync"
    28  	"testing"
    29  	"time"
    30  
    31  	"google.golang.org/protobuf/internal/version"
    32  )
    33  
    34  var (
    35  	regenerate   = flag.Bool("regenerate", false, "regenerate files")
    36  	buildRelease = flag.Bool("buildRelease", false, "build release binaries")
    37  
    38  	protobufVersion = "25.1"
    39  
    40  	golangVersions = func() []string {
    41  		// Version policy: same version as is in the x/ repos' go.mod.
    42  		return []string{
    43  			"1.17.13",
    44  			"1.18.10",
    45  			"1.19.13",
    46  			"1.20.12",
    47  			"1.21.5",
    48  		}
    49  	}()
    50  	golangLatest = golangVersions[len(golangVersions)-1]
    51  
    52  	staticcheckVersion = "2023.1.6"
    53  	staticcheckSHA256s = map[string]string{
    54  		"darwin/amd64": "b14a0cbd3c238713f5f9db41550893ea7d75d8d7822491c7f4e33e2fe43f6305",
    55  		"darwin/arm64": "f1c869abe6be2c6ab727dc9d6049766c947534766d71a1798c12a37526ea2b6f",
    56  		"linux/386":    "02859a7c44c7b5ab41a70d9b8107c01ab8d2c94075bae3d0b02157aff743ca42",
    57  		"linux/amd64":  "45337834da5dc7b8eff01cb6b3837e3759503cfbb8edf36b09e42f32bccb1f6e",
    58  	}
    59  
    60  	// purgeTimeout determines the maximum age of unused sub-directories.
    61  	purgeTimeout = 30 * 24 * time.Hour // 1 month
    62  
    63  	// Variables initialized by mustInitDeps.
    64  	modulePath   string
    65  	protobufPath string
    66  )
    67  
    68  func TestIntegration(t *testing.T) {
    69  	if testing.Short() {
    70  		t.Skip("skipping integration test in short mode")
    71  	}
    72  	if os.Getenv("GO_BUILDER_NAME") != "" {
    73  		// To start off, run on longtest builders, not longtest-race ones.
    74  		if race() {
    75  			t.Skip("skipping integration test in race mode on builders")
    76  		}
    77  		// When on a builder, run even if it's not explicitly requested
    78  		// provided our caller isn't already running it.
    79  		if os.Getenv("GO_PROTOBUF_INTEGRATION_TEST_RUNNING") == "1" {
    80  			t.Skip("protobuf integration test is already running, skipping nested invocation")
    81  		}
    82  		os.Setenv("GO_PROTOBUF_INTEGRATION_TEST_RUNNING", "1")
    83  	} else if flag.Lookup("test.run").Value.String() != "^TestIntegration$" {
    84  		t.Skip("not running integration test if not explicitly requested via test.bash")
    85  	}
    86  
    87  	mustInitDeps(t)
    88  	mustHandleFlags(t)
    89  
    90  	// Report dirt in the working tree quickly, rather than after
    91  	// going through all the presubmits.
    92  	//
    93  	// Fail the test late, so we can test uncommitted changes with -failfast.
    94  	gitDiff := mustRunCommand(t, "git", "diff", "HEAD")
    95  	if strings.TrimSpace(gitDiff) != "" {
    96  		fmt.Printf("WARNING: working tree contains uncommitted changes:\n%v\n", gitDiff)
    97  	}
    98  	gitUntracked := mustRunCommand(t, "git", "ls-files", "--others", "--exclude-standard")
    99  	if strings.TrimSpace(gitUntracked) != "" {
   100  		fmt.Printf("WARNING: working tree contains untracked files:\n%v\n", gitUntracked)
   101  	}
   102  
   103  	// Do the relatively fast checks up-front.
   104  	t.Run("GeneratedGoFiles", func(t *testing.T) {
   105  		diff := mustRunCommand(t, "go", "run", "-tags", "protolegacy", "./internal/cmd/generate-types")
   106  		if strings.TrimSpace(diff) != "" {
   107  			t.Fatalf("stale generated files:\n%v", diff)
   108  		}
   109  		diff = mustRunCommand(t, "go", "run", "-tags", "protolegacy", "./internal/cmd/generate-protos")
   110  		if strings.TrimSpace(diff) != "" {
   111  			t.Fatalf("stale generated files:\n%v", diff)
   112  		}
   113  	})
   114  	t.Run("FormattedGoFiles", func(t *testing.T) {
   115  		files := strings.Split(strings.TrimSpace(mustRunCommand(t, "git", "ls-files", "*.go")), "\n")
   116  		diff := mustRunCommand(t, append([]string{"gofmt", "-d"}, files...)...)
   117  		if strings.TrimSpace(diff) != "" {
   118  			t.Fatalf("unformatted source files:\n%v", diff)
   119  		}
   120  	})
   121  	t.Run("CopyrightHeaders", func(t *testing.T) {
   122  		files := strings.Split(strings.TrimSpace(mustRunCommand(t, "git", "ls-files", "*.go", "*.proto")), "\n")
   123  		mustHaveCopyrightHeader(t, files)
   124  	})
   125  
   126  	var wg sync.WaitGroup
   127  	sema := make(chan bool, (runtime.NumCPU()+1)/2)
   128  	for i := range golangVersions {
   129  		goVersion := golangVersions[i]
   130  		goLabel := "Go" + goVersion
   131  		runGo := func(label string, cmd command, args ...string) {
   132  			wg.Add(1)
   133  			sema <- true
   134  			go func() {
   135  				defer wg.Done()
   136  				defer func() { <-sema }()
   137  				t.Run(goLabel+"/"+label, func(t *testing.T) {
   138  					args[0] += goVersion
   139  					cmd.mustRun(t, args...)
   140  				})
   141  			}()
   142  		}
   143  
   144  		runGo("Normal", command{}, "go", "test", "-race", "./...")
   145  		runGo("PureGo", command{}, "go", "test", "-race", "-tags", "purego", "./...")
   146  		runGo("Reflect", command{}, "go", "test", "-race", "-tags", "protoreflect", "./...")
   147  		if goVersion == golangLatest {
   148  			runGo("ProtoLegacy", command{}, "go", "test", "-race", "-tags", "protolegacy", "./...")
   149  			runGo("ProtocGenGo", command{Dir: "cmd/protoc-gen-go/testdata"}, "go", "test")
   150  			runGo("Conformance", command{Dir: "internal/conformance"}, "go", "test", "-execute")
   151  
   152  			// Only run the 32-bit compatibility tests for Linux;
   153  			// avoid Darwin since 10.15 dropped support i386 code execution.
   154  			if runtime.GOOS == "linux" {
   155  				runGo("Arch32Bit", command{Env: append(os.Environ(), "GOARCH=386")}, "go", "test", "./...")
   156  			}
   157  		}
   158  	}
   159  	wg.Wait()
   160  
   161  	t.Run("GoStaticCheck", func(t *testing.T) {
   162  		checks := []string{
   163  			"all",     // start with all checks enabled
   164  			"-SA1019", // disable deprecated usage check
   165  			"-S*",     // disable code simplification checks
   166  			"-ST*",    // disable coding style checks
   167  			"-U*",     // disable unused declaration checks
   168  		}
   169  		out := mustRunCommand(t, "staticcheck", "-checks="+strings.Join(checks, ","), "-fail=none", "./...")
   170  
   171  		// Filter out findings from certain paths.
   172  		var findings []string
   173  		for _, finding := range strings.Split(strings.TrimSpace(out), "\n") {
   174  			switch {
   175  			case strings.HasPrefix(finding, "internal/testprotos/legacy/"):
   176  			default:
   177  				findings = append(findings, finding)
   178  			}
   179  		}
   180  		if len(findings) > 0 {
   181  			t.Fatalf("staticcheck findings:\n%v", strings.Join(findings, "\n"))
   182  		}
   183  	})
   184  	t.Run("CommittedGitChanges", func(t *testing.T) {
   185  		if strings.TrimSpace(gitDiff) != "" {
   186  			t.Fatalf("uncommitted changes")
   187  		}
   188  	})
   189  	t.Run("TrackedGitFiles", func(t *testing.T) {
   190  		if strings.TrimSpace(gitUntracked) != "" {
   191  			t.Fatalf("untracked files")
   192  		}
   193  	})
   194  }
   195  
   196  func mustInitDeps(t *testing.T) {
   197  	check := func(err error) {
   198  		t.Helper()
   199  		if err != nil {
   200  			t.Fatal(err)
   201  		}
   202  	}
   203  
   204  	// Determine the directory to place the test directory.
   205  	repoRoot, err := os.Getwd()
   206  	check(err)
   207  	testDir := filepath.Join(repoRoot, ".cache")
   208  	check(os.MkdirAll(testDir, 0775))
   209  
   210  	// Delete the current directory if non-empty,
   211  	// which only occurs if a dependency failed to initialize properly.
   212  	var workingDir string
   213  	finishedDirs := map[string]bool{}
   214  	defer func() {
   215  		if workingDir != "" {
   216  			os.RemoveAll(workingDir) // best-effort
   217  		}
   218  	}()
   219  	startWork := func(name string) string {
   220  		workingDir = filepath.Join(testDir, name)
   221  		return workingDir
   222  	}
   223  	finishWork := func() {
   224  		finishedDirs[workingDir] = true
   225  		workingDir = ""
   226  	}
   227  
   228  	// Delete other sub-directories that are no longer relevant.
   229  	defer func() {
   230  		now := time.Now()
   231  		fis, _ := ioutil.ReadDir(testDir)
   232  		for _, fi := range fis {
   233  			dir := filepath.Join(testDir, fi.Name())
   234  			if finishedDirs[dir] {
   235  				os.Chtimes(dir, now, now) // best-effort
   236  				continue
   237  			}
   238  			if now.Sub(fi.ModTime()) < purgeTimeout {
   239  				continue
   240  			}
   241  			fmt.Printf("delete %v\n", fi.Name())
   242  			os.RemoveAll(dir) // best-effort
   243  		}
   244  	}()
   245  
   246  	// The bin directory contains symlinks to each tool by version.
   247  	// It is safe to delete this directory and run the test script from scratch.
   248  	binPath := startWork("bin")
   249  	check(os.RemoveAll(binPath))
   250  	check(os.Mkdir(binPath, 0775))
   251  	check(os.Setenv("PATH", binPath+":"+os.Getenv("PATH")))
   252  	registerBinary := func(name, path string) {
   253  		check(os.Symlink(path, filepath.Join(binPath, name)))
   254  	}
   255  	finishWork()
   256  
   257  	// Get the protobuf toolchain.
   258  	protobufPath = startWork("protobuf-" + protobufVersion)
   259  	if _, err := os.Stat(protobufPath); err != nil {
   260  		fmt.Printf("download %v\n", filepath.Base(protobufPath))
   261  		checkoutVersion := protobufVersion
   262  		if isCommit := strings.Trim(protobufVersion, "0123456789abcdef") == ""; !isCommit {
   263  			// release tags have "v" prefix
   264  			checkoutVersion = "v" + protobufVersion
   265  		}
   266  		command{Dir: testDir}.mustRun(t, "git", "clone", "https://github.com/protocolbuffers/protobuf", "protobuf-"+protobufVersion)
   267  		command{Dir: protobufPath}.mustRun(t, "git", "checkout", checkoutVersion)
   268  
   269  		if os.Getenv("GO_BUILDER_NAME") != "" {
   270  			// If this is running on the Go build infrastructure,
   271  			// use pre-built versions of these binaries that the
   272  			// builders are configured to provide in $PATH.
   273  			protocPath, err := exec.LookPath("protoc")
   274  			check(err)
   275  			confTestRunnerPath, err := exec.LookPath("conformance_test_runner")
   276  			check(err)
   277  			check(os.MkdirAll(filepath.Join(protobufPath, "bazel-bin", "conformance"), 0775))
   278  			check(os.Symlink(protocPath, filepath.Join(protobufPath, "bazel-bin", "protoc")))
   279  			check(os.Symlink(confTestRunnerPath, filepath.Join(protobufPath, "bazel-bin", "conformance", "conformance_test_runner")))
   280  		} else {
   281  			// In other environments, download and build the protobuf toolchain.
   282  			// We avoid downloading the pre-compiled binaries since they do not contain
   283  			// the conformance test runner.
   284  			fmt.Printf("build %v\n", filepath.Base(protobufPath))
   285  			env := os.Environ()
   286  			if runtime.GOOS == "darwin" {
   287  				// Adding this environment variable appears to be necessary for macOS builds.
   288  				env = append(env, "CC=clang")
   289  			}
   290  			command{
   291  				Dir: protobufPath,
   292  				Env: env,
   293  			}.mustRun(t, "bazel", "build", ":protoc", "//conformance:conformance_test_runner")
   294  		}
   295  	}
   296  	check(os.Setenv("PROTOBUF_ROOT", protobufPath)) // for generate-protos
   297  	registerBinary("conform-test-runner", filepath.Join(protobufPath, "bazel-bin", "conformance", "conformance_test_runner"))
   298  	registerBinary("protoc", filepath.Join(protobufPath, "bazel-bin", "protoc"))
   299  	finishWork()
   300  
   301  	// Download each Go toolchain version.
   302  	for _, v := range golangVersions {
   303  		goDir := startWork("go" + v)
   304  		if _, err := os.Stat(goDir); err != nil {
   305  			fmt.Printf("download %v\n", filepath.Base(goDir))
   306  			url := fmt.Sprintf("https://dl.google.com/go/go%v.%v-%v.tar.gz", v, runtime.GOOS, runtime.GOARCH)
   307  			downloadArchive(check, goDir, url, "go", "") // skip SHA256 check as we fetch over https from a trusted domain
   308  		}
   309  		registerBinary("go"+v, filepath.Join(goDir, "bin", "go"))
   310  		finishWork()
   311  	}
   312  	registerBinary("go", filepath.Join(testDir, "go"+golangLatest, "bin", "go"))
   313  	registerBinary("gofmt", filepath.Join(testDir, "go"+golangLatest, "bin", "gofmt"))
   314  
   315  	// Download the staticcheck tool.
   316  	checkDir := startWork("staticcheck-" + staticcheckVersion)
   317  	if _, err := os.Stat(checkDir); err != nil {
   318  		fmt.Printf("download %v\n", filepath.Base(checkDir))
   319  		url := fmt.Sprintf("https://github.com/dominikh/go-tools/releases/download/%v/staticcheck_%v_%v.tar.gz", staticcheckVersion, runtime.GOOS, runtime.GOARCH)
   320  		downloadArchive(check, checkDir, url, "staticcheck", staticcheckSHA256s[runtime.GOOS+"/"+runtime.GOARCH])
   321  	}
   322  	registerBinary("staticcheck", filepath.Join(checkDir, "staticcheck"))
   323  	finishWork()
   324  
   325  	// GitHub actions sets GOROOT, which confuses invocations of the Go toolchain.
   326  	// Explicitly clear GOROOT, so each toolchain uses their default GOROOT.
   327  	check(os.Unsetenv("GOROOT"))
   328  
   329  	// Set a cache directory outside the test directory.
   330  	check(os.Setenv("GOCACHE", filepath.Join(repoRoot, ".gocache")))
   331  }
   332  
   333  func downloadFile(check func(error), dstPath, srcURL string, perm fs.FileMode) {
   334  	resp, err := http.Get(srcURL)
   335  	check(err)
   336  	defer resp.Body.Close()
   337  	if resp.StatusCode != http.StatusOK {
   338  		body, _ := io.ReadAll(io.LimitReader(resp.Body, 4<<10))
   339  		check(fmt.Errorf("GET %q: non-200 OK status code: %v body: %q", srcURL, resp.Status, body))
   340  	}
   341  
   342  	check(os.MkdirAll(filepath.Dir(dstPath), 0775))
   343  	f, err := os.OpenFile(dstPath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, perm)
   344  	check(err)
   345  
   346  	_, err = io.Copy(f, resp.Body)
   347  	check(err)
   348  
   349  	check(f.Close())
   350  }
   351  
   352  func downloadArchive(check func(error), dstPath, srcURL, skipPrefix, wantSHA256 string) {
   353  	check(os.RemoveAll(dstPath))
   354  
   355  	resp, err := http.Get(srcURL)
   356  	check(err)
   357  	defer resp.Body.Close()
   358  	if resp.StatusCode != http.StatusOK {
   359  		body, _ := io.ReadAll(io.LimitReader(resp.Body, 4<<10))
   360  		check(fmt.Errorf("GET %q: non-200 OK status code: %v body: %q", srcURL, resp.Status, body))
   361  	}
   362  
   363  	var r io.Reader = resp.Body
   364  	if wantSHA256 != "" {
   365  		b, err := ioutil.ReadAll(resp.Body)
   366  		check(err)
   367  		r = bytes.NewReader(b)
   368  
   369  		if gotSHA256 := fmt.Sprintf("%x", sha256.Sum256(b)); gotSHA256 != wantSHA256 {
   370  			check(fmt.Errorf("checksum validation error:\ngot  %v\nwant %v", gotSHA256, wantSHA256))
   371  		}
   372  	}
   373  
   374  	zr, err := gzip.NewReader(r)
   375  	check(err)
   376  
   377  	tr := tar.NewReader(zr)
   378  	for {
   379  		h, err := tr.Next()
   380  		if err == io.EOF {
   381  			return
   382  		}
   383  		check(err)
   384  
   385  		// Skip directories or files outside the prefix directory.
   386  		if len(skipPrefix) > 0 {
   387  			if !strings.HasPrefix(h.Name, skipPrefix) {
   388  				continue
   389  			}
   390  			if len(h.Name) > len(skipPrefix) && h.Name[len(skipPrefix)] != '/' {
   391  				continue
   392  			}
   393  		}
   394  
   395  		path := strings.TrimPrefix(strings.TrimPrefix(h.Name, skipPrefix), "/")
   396  		path = filepath.Join(dstPath, filepath.FromSlash(path))
   397  		mode := os.FileMode(h.Mode & 0777)
   398  		switch h.Typeflag {
   399  		case tar.TypeReg:
   400  			b, err := ioutil.ReadAll(tr)
   401  			check(err)
   402  			check(ioutil.WriteFile(path, b, mode))
   403  		case tar.TypeDir:
   404  			check(os.Mkdir(path, mode))
   405  		}
   406  	}
   407  }
   408  
   409  func mustHandleFlags(t *testing.T) {
   410  	if *regenerate {
   411  		t.Run("Generate", func(t *testing.T) {
   412  			fmt.Print(mustRunCommand(t, "go", "generate", "./internal/cmd/generate-types"))
   413  			fmt.Print(mustRunCommand(t, "go", "generate", "./internal/cmd/generate-protos"))
   414  			files := strings.Split(strings.TrimSpace(mustRunCommand(t, "git", "ls-files", "*.go")), "\n")
   415  			mustRunCommand(t, append([]string{"gofmt", "-w"}, files...)...)
   416  		})
   417  	}
   418  	if *buildRelease {
   419  		t.Run("BuildRelease", func(t *testing.T) {
   420  			v := version.String()
   421  			for _, goos := range []string{"linux", "darwin", "windows"} {
   422  				for _, goarch := range []string{"386", "amd64", "arm64"} {
   423  					// Avoid Darwin since 10.15 dropped support for i386.
   424  					if goos == "darwin" && goarch == "386" {
   425  						continue
   426  					}
   427  
   428  					binPath := filepath.Join("bin", fmt.Sprintf("protoc-gen-go.%v.%v.%v", v, goos, goarch))
   429  
   430  					// Build the binary.
   431  					cmd := command{Env: append(os.Environ(), "GOOS="+goos, "GOARCH="+goarch)}
   432  					cmd.mustRun(t, "go", "build", "-trimpath", "-ldflags", "-s -w -buildid=", "-o", binPath, "./cmd/protoc-gen-go")
   433  
   434  					// Archive and compress the binary.
   435  					in, err := ioutil.ReadFile(binPath)
   436  					if err != nil {
   437  						t.Fatal(err)
   438  					}
   439  					out := new(bytes.Buffer)
   440  					suffix := ""
   441  					comment := fmt.Sprintf("protoc-gen-go VERSION=%v GOOS=%v GOARCH=%v", v, goos, goarch)
   442  					switch goos {
   443  					case "windows":
   444  						suffix = ".zip"
   445  						zw := zip.NewWriter(out)
   446  						zw.SetComment(comment)
   447  						fw, _ := zw.Create("protoc-gen-go.exe")
   448  						fw.Write(in)
   449  						zw.Close()
   450  					default:
   451  						suffix = ".tar.gz"
   452  						gz, _ := gzip.NewWriterLevel(out, gzip.BestCompression)
   453  						gz.Comment = comment
   454  						tw := tar.NewWriter(gz)
   455  						tw.WriteHeader(&tar.Header{
   456  							Name: "protoc-gen-go",
   457  							Mode: int64(0775),
   458  							Size: int64(len(in)),
   459  						})
   460  						tw.Write(in)
   461  						tw.Close()
   462  						gz.Close()
   463  					}
   464  					if err := ioutil.WriteFile(binPath+suffix, out.Bytes(), 0664); err != nil {
   465  						t.Fatal(err)
   466  					}
   467  				}
   468  			}
   469  		})
   470  	}
   471  	if *regenerate || *buildRelease {
   472  		t.SkipNow()
   473  	}
   474  }
   475  
   476  var copyrightRegex = []*regexp.Regexp{
   477  	regexp.MustCompile(`^// Copyright \d\d\d\d The Go Authors\. All rights reserved.
   478  // Use of this source code is governed by a BSD-style
   479  // license that can be found in the LICENSE file\.
   480  `),
   481  	// Generated .pb.go files from main protobuf repo.
   482  	regexp.MustCompile(`^// Protocol Buffers - Google's data interchange format
   483  // Copyright \d\d\d\d Google Inc\.  All rights reserved\.
   484  `),
   485  }
   486  
   487  func mustHaveCopyrightHeader(t *testing.T, files []string) {
   488  	var bad []string
   489  File:
   490  	for _, file := range files {
   491  		b, err := ioutil.ReadFile(file)
   492  		if err != nil {
   493  			t.Fatal(err)
   494  		}
   495  		for _, re := range copyrightRegex {
   496  			if loc := re.FindIndex(b); loc != nil && loc[0] == 0 {
   497  				continue File
   498  			}
   499  		}
   500  		bad = append(bad, file)
   501  	}
   502  	if len(bad) > 0 {
   503  		t.Fatalf("files with missing/bad copyright headers:\n  %v", strings.Join(bad, "\n  "))
   504  	}
   505  }
   506  
   507  type command struct {
   508  	Dir string
   509  	Env []string
   510  }
   511  
   512  func (c command) mustRun(t *testing.T, args ...string) string {
   513  	t.Helper()
   514  	stdout := new(bytes.Buffer)
   515  	stderr := new(bytes.Buffer)
   516  	cmd := exec.Command(args[0], args[1:]...)
   517  	cmd.Dir = "."
   518  	if c.Dir != "" {
   519  		cmd.Dir = c.Dir
   520  	}
   521  	cmd.Env = os.Environ()
   522  	if c.Env != nil {
   523  		cmd.Env = c.Env
   524  	}
   525  	cmd.Env = append(cmd.Env, "PWD="+cmd.Dir)
   526  	cmd.Stdout = stdout
   527  	cmd.Stderr = stderr
   528  	if err := cmd.Run(); err != nil {
   529  		t.Fatalf("executing (%v): %v\n%s%s", strings.Join(args, " "), err, stdout.String(), stderr.String())
   530  	}
   531  	return stdout.String()
   532  }
   533  
   534  func mustRunCommand(t *testing.T, args ...string) string {
   535  	t.Helper()
   536  	return command{}.mustRun(t, args...)
   537  }
   538  
   539  // race is an approximation of whether the race detector is on.
   540  // It's used to skip the integration test on builders, without
   541  // preventing the integration test from running under the race
   542  // detector as a '//go:build !race' build constraint would.
   543  func race() bool {
   544  	bi, ok := debug.ReadBuildInfo()
   545  	if !ok {
   546  		return false
   547  	}
   548  	// Use reflect because the debug.BuildInfo.Settings field
   549  	// isn't available in Go 1.17.
   550  	s := reflect.ValueOf(bi).Elem().FieldByName("Settings")
   551  	if !s.IsValid() {
   552  		return false
   553  	}
   554  	for i := 0; i < s.Len(); i++ {
   555  		if s.Index(i).FieldByName("Key").String() == "-race" {
   556  			return s.Index(i).FieldByName("Value").String() == "true"
   557  		}
   558  	}
   559  	return false
   560  }
   561  

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