Source file src/cmd/dist/test.go

     1  // Copyright 2015 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  	"bytes"
     9  	"encoding/json"
    10  	"flag"
    11  	"fmt"
    12  	"io"
    13  	"io/fs"
    14  	"log"
    15  	"os"
    16  	"os/exec"
    17  	"path/filepath"
    18  	"reflect"
    19  	"regexp"
    20  	"runtime"
    21  	"slices"
    22  	"strconv"
    23  	"strings"
    24  	"time"
    25  )
    26  
    27  func cmdtest() {
    28  	gogcflags = os.Getenv("GO_GCFLAGS")
    29  	setNoOpt()
    30  
    31  	var t tester
    32  
    33  	var noRebuild bool
    34  	flag.BoolVar(&t.listMode, "list", false, "list available tests")
    35  	flag.BoolVar(&t.rebuild, "rebuild", false, "rebuild everything first")
    36  	flag.BoolVar(&noRebuild, "no-rebuild", false, "overrides -rebuild (historical dreg)")
    37  	flag.BoolVar(&t.keepGoing, "k", false, "keep going even when error occurred")
    38  	flag.BoolVar(&t.race, "race", false, "run in race builder mode (different set of tests)")
    39  	flag.BoolVar(&t.compileOnly, "compile-only", false, "compile tests, but don't run them")
    40  	flag.StringVar(&t.banner, "banner", "##### ", "banner prefix; blank means no section banners")
    41  	flag.StringVar(&t.runRxStr, "run", "",
    42  		"run only those tests matching the regular expression; empty means to run all. "+
    43  			"Special exception: if the string begins with '!', the match is inverted.")
    44  	flag.BoolVar(&t.msan, "msan", false, "run in memory sanitizer builder mode")
    45  	flag.BoolVar(&t.asan, "asan", false, "run in address sanitizer builder mode")
    46  	flag.BoolVar(&t.json, "json", false, "report test results in JSON")
    47  
    48  	xflagparse(-1) // any number of args
    49  	if noRebuild {
    50  		t.rebuild = false
    51  	}
    52  
    53  	t.run()
    54  }
    55  
    56  // tester executes cmdtest.
    57  type tester struct {
    58  	race        bool
    59  	msan        bool
    60  	asan        bool
    61  	listMode    bool
    62  	rebuild     bool
    63  	failed      bool
    64  	keepGoing   bool
    65  	compileOnly bool // just try to compile all tests, but no need to run
    66  	runRxStr    string
    67  	runRx       *regexp.Regexp
    68  	runRxWant   bool     // want runRx to match (true) or not match (false)
    69  	runNames    []string // tests to run, exclusive with runRx; empty means all
    70  	banner      string   // prefix, or "" for none
    71  	lastHeading string   // last dir heading printed
    72  
    73  	short      bool
    74  	cgoEnabled bool
    75  	json       bool
    76  
    77  	tests        []distTest // use addTest to extend
    78  	testNames    map[string]bool
    79  	timeoutScale int
    80  
    81  	worklist []*work
    82  }
    83  
    84  // work tracks command execution for a test.
    85  type work struct {
    86  	dt    *distTest     // unique test name, etc.
    87  	cmd   *exec.Cmd     // must write stdout/stderr to out
    88  	flush func()        // if non-nil, called after cmd.Run
    89  	start chan bool     // a true means to start, a false means to skip
    90  	out   bytes.Buffer  // combined stdout/stderr from cmd
    91  	err   error         // work result
    92  	end   chan struct{} // a value means cmd ended (or was skipped)
    93  }
    94  
    95  // printSkip prints a skip message for all of work.
    96  func (w *work) printSkip(t *tester, msg string) {
    97  	if t.json {
    98  		synthesizeSkipEvent(json.NewEncoder(&w.out), w.dt.name, msg)
    99  		return
   100  	}
   101  	fmt.Fprintln(&w.out, msg)
   102  }
   103  
   104  // A distTest is a test run by dist test.
   105  // Each test has a unique name and belongs to a group (heading)
   106  type distTest struct {
   107  	name    string // unique test name; may be filtered with -run flag
   108  	heading string // group section; this header is printed before the test is run.
   109  	fn      func(*distTest) error
   110  }
   111  
   112  func (t *tester) run() {
   113  	timelog("start", "dist test")
   114  
   115  	os.Setenv("PATH", fmt.Sprintf("%s%c%s", gorootBin, os.PathListSeparator, os.Getenv("PATH")))
   116  
   117  	t.short = true
   118  	if v := os.Getenv("GO_TEST_SHORT"); v != "" {
   119  		short, err := strconv.ParseBool(v)
   120  		if err != nil {
   121  			fatalf("invalid GO_TEST_SHORT %q: %v", v, err)
   122  		}
   123  		t.short = short
   124  	}
   125  
   126  	cmd := exec.Command(gorootBinGo, "env", "CGO_ENABLED")
   127  	cmd.Stderr = new(bytes.Buffer)
   128  	slurp, err := cmd.Output()
   129  	if err != nil {
   130  		fatalf("Error running %s: %v\n%s", cmd, err, cmd.Stderr)
   131  	}
   132  	parts := strings.Split(string(slurp), "\n")
   133  	if nlines := len(parts) - 1; nlines < 1 {
   134  		fatalf("Error running %s: output contains <1 lines\n%s", cmd, cmd.Stderr)
   135  	}
   136  	t.cgoEnabled, _ = strconv.ParseBool(parts[0])
   137  
   138  	if flag.NArg() > 0 && t.runRxStr != "" {
   139  		fatalf("the -run regular expression flag is mutually exclusive with test name arguments")
   140  	}
   141  
   142  	t.runNames = flag.Args()
   143  
   144  	// Set GOTRACEBACK to system if the user didn't set a level explicitly.
   145  	// Since we're running tests for Go, we want as much detail as possible
   146  	// if something goes wrong.
   147  	//
   148  	// Set it before running any commands just in case something goes wrong.
   149  	if ok := isEnvSet("GOTRACEBACK"); !ok {
   150  		if err := os.Setenv("GOTRACEBACK", "system"); err != nil {
   151  			if t.keepGoing {
   152  				log.Printf("Failed to set GOTRACEBACK: %v", err)
   153  			} else {
   154  				fatalf("Failed to set GOTRACEBACK: %v", err)
   155  			}
   156  		}
   157  	}
   158  
   159  	if t.rebuild {
   160  		t.out("Building packages and commands.")
   161  		// Force rebuild the whole toolchain.
   162  		goInstall(toolenv(), gorootBinGo, append([]string{"-a"}, toolchain...)...)
   163  	}
   164  
   165  	if !t.listMode {
   166  		if builder := os.Getenv("GO_BUILDER_NAME"); builder == "" {
   167  			// Ensure that installed commands are up to date, even with -no-rebuild,
   168  			// so that tests that run commands end up testing what's actually on disk.
   169  			// If everything is up-to-date, this is a no-op.
   170  			// We first build the toolchain twice to allow it to converge,
   171  			// as when we first bootstrap.
   172  			// See cmdbootstrap for a description of the overall process.
   173  			//
   174  			// On the builders, we skip this step: we assume that 'dist test' is
   175  			// already using the result of a clean build, and because of test sharding
   176  			// and virtualization we usually start with a clean GOCACHE, so we would
   177  			// end up rebuilding large parts of the standard library that aren't
   178  			// otherwise relevant to the actual set of packages under test.
   179  			goInstall(toolenv(), gorootBinGo, toolchain...)
   180  			goInstall(toolenv(), gorootBinGo, toolchain...)
   181  			goInstall(toolenv(), gorootBinGo, toolsToInstall...)
   182  		}
   183  	}
   184  
   185  	t.timeoutScale = 1
   186  	if s := os.Getenv("GO_TEST_TIMEOUT_SCALE"); s != "" {
   187  		t.timeoutScale, err = strconv.Atoi(s)
   188  		if err != nil {
   189  			fatalf("failed to parse $GO_TEST_TIMEOUT_SCALE = %q as integer: %v", s, err)
   190  		}
   191  	}
   192  
   193  	if t.runRxStr != "" {
   194  		if t.runRxStr[0] == '!' {
   195  			t.runRxWant = false
   196  			t.runRxStr = t.runRxStr[1:]
   197  		} else {
   198  			t.runRxWant = true
   199  		}
   200  		t.runRx = regexp.MustCompile(t.runRxStr)
   201  	}
   202  
   203  	t.registerTests()
   204  	if t.listMode {
   205  		for _, tt := range t.tests {
   206  			fmt.Println(tt.name)
   207  		}
   208  		return
   209  	}
   210  
   211  	for _, name := range t.runNames {
   212  		if !t.testNames[name] {
   213  			fatalf("unknown test %q", name)
   214  		}
   215  	}
   216  
   217  	// On a few builders, make GOROOT unwritable to catch tests writing to it.
   218  	if strings.HasPrefix(os.Getenv("GO_BUILDER_NAME"), "linux-") {
   219  		if os.Getuid() == 0 {
   220  			// Don't bother making GOROOT unwritable:
   221  			// we're running as root, so permissions would have no effect.
   222  		} else {
   223  			xatexit(t.makeGOROOTUnwritable())
   224  		}
   225  	}
   226  
   227  	if !t.json {
   228  		if err := t.maybeLogMetadata(); err != nil {
   229  			t.failed = true
   230  			if t.keepGoing {
   231  				log.Printf("Failed logging metadata: %v", err)
   232  			} else {
   233  				fatalf("Failed logging metadata: %v", err)
   234  			}
   235  		}
   236  	}
   237  
   238  	var anyIncluded, someExcluded bool
   239  	for _, dt := range t.tests {
   240  		if !t.shouldRunTest(dt.name) {
   241  			someExcluded = true
   242  			continue
   243  		}
   244  		anyIncluded = true
   245  		dt := dt // dt used in background after this iteration
   246  		if err := dt.fn(&dt); err != nil {
   247  			t.runPending(&dt) // in case that hasn't been done yet
   248  			t.failed = true
   249  			if t.keepGoing {
   250  				log.Printf("Failed: %v", err)
   251  			} else {
   252  				fatalf("Failed: %v", err)
   253  			}
   254  		}
   255  	}
   256  	t.runPending(nil)
   257  	timelog("end", "dist test")
   258  
   259  	if !t.json {
   260  		if t.failed {
   261  			fmt.Println("\nFAILED")
   262  		} else if !anyIncluded {
   263  			fmt.Println()
   264  			errprintf("go tool dist: warning: %q matched no tests; use the -list flag to list available tests\n", t.runRxStr)
   265  			fmt.Println("NO TESTS TO RUN")
   266  		} else if someExcluded {
   267  			fmt.Println("\nALL TESTS PASSED (some were excluded)")
   268  		} else {
   269  			fmt.Println("\nALL TESTS PASSED")
   270  		}
   271  	}
   272  	if t.failed {
   273  		xexit(1)
   274  	}
   275  }
   276  
   277  func (t *tester) shouldRunTest(name string) bool {
   278  	if t.runRx != nil {
   279  		return t.runRx.MatchString(name) == t.runRxWant
   280  	}
   281  	if len(t.runNames) == 0 {
   282  		return true
   283  	}
   284  	return slices.Contains(t.runNames, name)
   285  }
   286  
   287  func (t *tester) maybeLogMetadata() error {
   288  	if t.compileOnly {
   289  		// We need to run a subprocess to log metadata. Don't do that
   290  		// on compile-only runs.
   291  		return nil
   292  	}
   293  	t.out("Test execution environment.")
   294  	// Helper binary to print system metadata (CPU model, etc). This is a
   295  	// separate binary from dist so it need not build with the bootstrap
   296  	// toolchain.
   297  	//
   298  	// TODO(prattmic): If we split dist bootstrap and dist test then this
   299  	// could be simplified to directly use internal/sysinfo here.
   300  	return t.dirCmd(filepath.Join(goroot, "src/cmd/internal/metadata"), gorootBinGo, []string{"run", "main.go"}).Run()
   301  }
   302  
   303  // testName returns the dist test name for a given package and variant.
   304  func testName(pkg, variant string) string {
   305  	name := pkg
   306  	if variant != "" {
   307  		name += ":" + variant
   308  	}
   309  	return name
   310  }
   311  
   312  // goTest represents all options to a "go test" command. The final command will
   313  // combine configuration from goTest and tester flags.
   314  type goTest struct {
   315  	timeout  time.Duration // If non-zero, override timeout
   316  	short    bool          // If true, force -short
   317  	tags     []string      // Build tags
   318  	race     bool          // Force -race
   319  	bench    bool          // Run benchmarks (briefly), not tests.
   320  	runTests string        // Regexp of tests to run
   321  	cpu      string        // If non-empty, -cpu flag
   322  	skip     string        // If non-empty, -skip flag
   323  
   324  	gcflags   string // If non-empty, build with -gcflags=all=X
   325  	ldflags   string // If non-empty, build with -ldflags=X
   326  	buildmode string // If non-empty, -buildmode flag
   327  
   328  	env []string // Environment variables to add, as KEY=VAL. KEY= unsets a variable
   329  
   330  	runOnHost bool // When cross-compiling, run this test on the host instead of guest
   331  
   332  	// variant, if non-empty, is a name used to distinguish different
   333  	// configurations of the same test package(s). If set and omitVariant is false,
   334  	// the Package field in test2json output is rewritten to pkg:variant.
   335  	variant string
   336  	// omitVariant indicates that variant is used solely for the dist test name and
   337  	// that the set of test names run by each variant (including empty) of a package
   338  	// is non-overlapping.
   339  	//
   340  	// TODO(mknyszek): Consider removing omitVariant as it is no longer set to true
   341  	// by any test. It's too valuable to have timing information in ResultDB that
   342  	// corresponds directly with dist names for tests.
   343  	omitVariant bool
   344  
   345  	// We have both pkg and pkgs as a convenience. Both may be set, in which
   346  	// case they will be combined. At least one must be set.
   347  	pkgs []string // Multiple packages to test
   348  	pkg  string   // A single package to test
   349  
   350  	testFlags []string // Additional flags accepted by this test
   351  }
   352  
   353  // compileOnly reports whether this test is only for compiling,
   354  // indicated by runTests being set to '^$' and bench being false.
   355  func (opts *goTest) compileOnly() bool {
   356  	return opts.runTests == "^$" && !opts.bench
   357  }
   358  
   359  // bgCommand returns a go test Cmd and a post-Run flush function. The result
   360  // will write its output to stdout and stderr. If stdout==stderr, bgCommand
   361  // ensures Writes are serialized. The caller should call flush() after Cmd exits.
   362  func (opts *goTest) bgCommand(t *tester, stdout, stderr io.Writer) (cmd *exec.Cmd, flush func()) {
   363  	build, run, pkgs, testFlags, setupCmd := opts.buildArgs(t)
   364  
   365  	// Combine the flags.
   366  	args := append([]string{"test"}, build...)
   367  	if t.compileOnly || opts.compileOnly() {
   368  		args = append(args, "-c", "-o", os.DevNull)
   369  	} else {
   370  		args = append(args, run...)
   371  	}
   372  	args = append(args, pkgs...)
   373  	if !t.compileOnly && !opts.compileOnly() {
   374  		args = append(args, testFlags...)
   375  	}
   376  
   377  	cmd = exec.Command(gorootBinGo, args...)
   378  	setupCmd(cmd)
   379  	if t.json && opts.variant != "" && !opts.omitVariant {
   380  		// Rewrite Package in the JSON output to be pkg:variant. When omitVariant
   381  		// is true, pkg.TestName is already unambiguous, so we don't need to
   382  		// rewrite the Package field.
   383  		//
   384  		// We only want to process JSON on the child's stdout. Ideally if
   385  		// stdout==stderr, we would also use the same testJSONFilter for
   386  		// cmd.Stdout and cmd.Stderr in order to keep the underlying
   387  		// interleaving of writes, but then it would see even partial writes
   388  		// interleaved, which would corrupt the JSON. So, we only process
   389  		// cmd.Stdout. This has another consequence though: if stdout==stderr,
   390  		// we have to serialize Writes in case the Writer is not concurrent
   391  		// safe. If we were just passing stdout/stderr through to exec, it would
   392  		// do this for us, but since we're wrapping stdout, we have to do it
   393  		// ourselves.
   394  		if stdout == stderr {
   395  			stdout = &lockedWriter{w: stdout}
   396  			stderr = stdout
   397  		}
   398  		f := &testJSONFilter{w: stdout, variant: opts.variant}
   399  		cmd.Stdout = f
   400  		flush = f.Flush
   401  	} else {
   402  		cmd.Stdout = stdout
   403  		flush = func() {}
   404  	}
   405  	cmd.Stderr = stderr
   406  
   407  	return cmd, flush
   408  }
   409  
   410  // run runs a go test and returns an error if it does not succeed.
   411  func (opts *goTest) run(t *tester) error {
   412  	cmd, flush := opts.bgCommand(t, os.Stdout, os.Stderr)
   413  	err := cmd.Run()
   414  	flush()
   415  	return err
   416  }
   417  
   418  // buildArgs is in internal helper for goTest that constructs the elements of
   419  // the "go test" command line. build is the flags for building the test. run is
   420  // the flags for running the test. pkgs is the list of packages to build and
   421  // run. testFlags is the list of flags to pass to the test package.
   422  //
   423  // The caller must call setupCmd on the resulting exec.Cmd to set its directory
   424  // and environment.
   425  func (opts *goTest) buildArgs(t *tester) (build, run, pkgs, testFlags []string, setupCmd func(*exec.Cmd)) {
   426  	run = append(run, "-count=1") // Disallow caching
   427  	if opts.timeout != 0 {
   428  		d := opts.timeout * time.Duration(t.timeoutScale)
   429  		run = append(run, "-timeout="+d.String())
   430  	} else if t.timeoutScale != 1 {
   431  		const goTestDefaultTimeout = 10 * time.Minute // Default value of go test -timeout flag.
   432  		run = append(run, "-timeout="+(goTestDefaultTimeout*time.Duration(t.timeoutScale)).String())
   433  	}
   434  	if opts.short || t.short {
   435  		run = append(run, "-short")
   436  	}
   437  	var tags []string
   438  	if t.iOS() {
   439  		tags = append(tags, "lldb")
   440  	}
   441  	if noOpt {
   442  		tags = append(tags, "noopt")
   443  	}
   444  	tags = append(tags, opts.tags...)
   445  	if len(tags) > 0 {
   446  		build = append(build, "-tags="+strings.Join(tags, ","))
   447  	}
   448  	if t.race || opts.race {
   449  		build = append(build, "-race")
   450  	}
   451  	if t.msan {
   452  		build = append(build, "-msan")
   453  	}
   454  	if t.asan {
   455  		build = append(build, "-asan")
   456  	}
   457  	if opts.bench {
   458  		// Run no tests.
   459  		run = append(run, "-run=^$")
   460  		// Run benchmarks briefly as a smoke test.
   461  		run = append(run, "-bench=.*", "-benchtime=.1s")
   462  	} else if opts.runTests != "" {
   463  		run = append(run, "-run="+opts.runTests)
   464  	}
   465  	if opts.cpu != "" {
   466  		run = append(run, "-cpu="+opts.cpu)
   467  	}
   468  	if opts.skip != "" {
   469  		run = append(run, "-skip="+opts.skip)
   470  	}
   471  	if t.json {
   472  		run = append(run, "-json")
   473  	}
   474  
   475  	if opts.gcflags != "" {
   476  		build = append(build, "-gcflags=all="+opts.gcflags)
   477  	}
   478  	if opts.ldflags != "" {
   479  		build = append(build, "-ldflags="+opts.ldflags)
   480  	}
   481  	if opts.buildmode != "" {
   482  		build = append(build, "-buildmode="+opts.buildmode)
   483  	}
   484  
   485  	pkgs = opts.packages()
   486  
   487  	runOnHost := opts.runOnHost && (goarch != gohostarch || goos != gohostos)
   488  	needTestFlags := len(opts.testFlags) > 0 || runOnHost
   489  	if needTestFlags {
   490  		testFlags = append([]string{"-args"}, opts.testFlags...)
   491  	}
   492  	if runOnHost {
   493  		// -target is a special flag understood by tests that can run on the host
   494  		testFlags = append(testFlags, "-target="+goos+"/"+goarch)
   495  	}
   496  
   497  	setupCmd = func(cmd *exec.Cmd) {
   498  		setDir(cmd, filepath.Join(goroot, "src"))
   499  		if len(opts.env) != 0 {
   500  			for _, kv := range opts.env {
   501  				if i := strings.Index(kv, "="); i < 0 {
   502  					unsetEnv(cmd, kv[:len(kv)-1])
   503  				} else {
   504  					setEnv(cmd, kv[:i], kv[i+1:])
   505  				}
   506  			}
   507  		}
   508  		if runOnHost {
   509  			setEnv(cmd, "GOARCH", gohostarch)
   510  			setEnv(cmd, "GOOS", gohostos)
   511  		}
   512  	}
   513  
   514  	return
   515  }
   516  
   517  // packages returns the full list of packages to be run by this goTest. This
   518  // will always include at least one package.
   519  func (opts *goTest) packages() []string {
   520  	pkgs := opts.pkgs
   521  	if opts.pkg != "" {
   522  		pkgs = append(pkgs[:len(pkgs):len(pkgs)], opts.pkg)
   523  	}
   524  	if len(pkgs) == 0 {
   525  		panic("no packages")
   526  	}
   527  	return pkgs
   528  }
   529  
   530  // printSkip prints a skip message for all of goTest.
   531  func (opts *goTest) printSkip(t *tester, msg string) {
   532  	if t.json {
   533  		enc := json.NewEncoder(os.Stdout)
   534  		for _, pkg := range opts.packages() {
   535  			synthesizeSkipEvent(enc, pkg, msg)
   536  		}
   537  		return
   538  	}
   539  	fmt.Println(msg)
   540  }
   541  
   542  // ranGoTest and stdMatches are state closed over by the stdlib
   543  // testing func in registerStdTest below. The tests are run
   544  // sequentially, so there's no need for locks.
   545  //
   546  // ranGoBench and benchMatches are the same, but are only used
   547  // in -race mode.
   548  var (
   549  	ranGoTest  bool
   550  	stdMatches []string
   551  
   552  	ranGoBench   bool
   553  	benchMatches []string
   554  )
   555  
   556  func (t *tester) registerStdTest(pkg string) {
   557  	const stdTestHeading = "Testing packages." // known to addTest for a safety check
   558  	gcflags := gogcflags
   559  	name := testName(pkg, "")
   560  	if t.runRx == nil || t.runRx.MatchString(name) == t.runRxWant {
   561  		stdMatches = append(stdMatches, pkg)
   562  	}
   563  	t.addTest(name, stdTestHeading, func(dt *distTest) error {
   564  		if ranGoTest {
   565  			return nil
   566  		}
   567  		t.runPending(dt)
   568  		timelog("start", dt.name)
   569  		defer timelog("end", dt.name)
   570  		ranGoTest = true
   571  
   572  		timeoutSec := 180 * time.Second
   573  		for _, pkg := range stdMatches {
   574  			if pkg == "cmd/go" {
   575  				timeoutSec *= 3
   576  				break
   577  			}
   578  		}
   579  		return (&goTest{
   580  			timeout: timeoutSec,
   581  			gcflags: gcflags,
   582  			pkgs:    stdMatches,
   583  		}).run(t)
   584  	})
   585  }
   586  
   587  func (t *tester) registerRaceBenchTest(pkg string) {
   588  	const raceBenchHeading = "Running benchmarks briefly." // known to addTest for a safety check
   589  	name := testName(pkg, "racebench")
   590  	if t.runRx == nil || t.runRx.MatchString(name) == t.runRxWant {
   591  		benchMatches = append(benchMatches, pkg)
   592  	}
   593  	t.addTest(name, raceBenchHeading, func(dt *distTest) error {
   594  		if ranGoBench {
   595  			return nil
   596  		}
   597  		t.runPending(dt)
   598  		timelog("start", dt.name)
   599  		defer timelog("end", dt.name)
   600  		ranGoBench = true
   601  		return (&goTest{
   602  			variant: "racebench",
   603  			// Include the variant even though there's no overlap in test names.
   604  			// This makes the test targets distinct, allowing our build system to record
   605  			// elapsed time for each one, which is useful for load-balancing test shards.
   606  			omitVariant: false,
   607  			timeout:     1200 * time.Second, // longer timeout for race with benchmarks
   608  			race:        true,
   609  			bench:       true,
   610  			cpu:         "4",
   611  			pkgs:        benchMatches,
   612  		}).run(t)
   613  	})
   614  }
   615  
   616  func (t *tester) registerTests() {
   617  	// registerStdTestSpecially tracks import paths in the standard library
   618  	// whose test registration happens in a special way.
   619  	//
   620  	// These tests *must* be able to run normally as part of "go test std cmd",
   621  	// even if they are also registered separately by dist, because users often
   622  	// run go test directly. Use skips or build tags in preference to expanding
   623  	// this list.
   624  	registerStdTestSpecially := map[string]bool{
   625  		// testdir can run normally as part of "go test std cmd", but because
   626  		// it's a very large test, we register is specially as several shards to
   627  		// enable better load balancing on sharded builders. Ideally the build
   628  		// system would know how to shard any large test package.
   629  		"cmd/internal/testdir": true,
   630  	}
   631  
   632  	// Fast path to avoid the ~1 second of `go list std cmd` when
   633  	// the caller lists specific tests to run. (as the continuous
   634  	// build coordinator does).
   635  	if len(t.runNames) > 0 {
   636  		for _, name := range t.runNames {
   637  			if !strings.Contains(name, ":") {
   638  				t.registerStdTest(name)
   639  			} else if strings.HasSuffix(name, ":racebench") {
   640  				t.registerRaceBenchTest(strings.TrimSuffix(name, ":racebench"))
   641  			}
   642  		}
   643  	} else {
   644  		// Use 'go list std cmd' to get a list of all Go packages
   645  		// that running 'go test std cmd' could find problems in.
   646  		// (In race test mode, also set -tags=race.)
   647  		// This includes vendored packages and other
   648  		// packages without tests so that 'dist test' finds if any of
   649  		// them don't build, have a problem reported by high-confidence
   650  		// vet checks that come with 'go test', and anything else it
   651  		// may check in the future. See go.dev/issue/60463.
   652  		// Most packages have tests, so there is not much saved
   653  		// by skipping non-test packages.
   654  		// For the packages without any test files,
   655  		// 'go test' knows not to actually build a test binary,
   656  		// so the only cost is the vet, and we still want to run vet.
   657  		cmd := exec.Command(gorootBinGo, "list")
   658  		if t.race {
   659  			cmd.Args = append(cmd.Args, "-tags=race")
   660  		}
   661  		cmd.Args = append(cmd.Args, "std", "cmd")
   662  		cmd.Stderr = new(bytes.Buffer)
   663  		all, err := cmd.Output()
   664  		if err != nil {
   665  			fatalf("Error running go list std cmd: %v:\n%s", err, cmd.Stderr)
   666  		}
   667  		pkgs := strings.Fields(string(all))
   668  		for _, pkg := range pkgs {
   669  			if registerStdTestSpecially[pkg] {
   670  				continue
   671  			}
   672  			if t.short && (strings.HasPrefix(pkg, "vendor/") || strings.HasPrefix(pkg, "cmd/vendor/")) {
   673  				// Vendored code has no tests, and we don't care too much about vet errors
   674  				// since we can't modify the code, so skip the tests in short mode.
   675  				// We still let the longtest builders vet them.
   676  				continue
   677  			}
   678  			t.registerStdTest(pkg)
   679  		}
   680  		if t.race {
   681  			for _, pkg := range pkgs {
   682  				if t.packageHasBenchmarks(pkg) {
   683  					t.registerRaceBenchTest(pkg)
   684  				}
   685  			}
   686  		}
   687  	}
   688  
   689  	if t.race {
   690  		return
   691  	}
   692  
   693  	// Test the os/user package in the pure-Go mode too.
   694  	if !t.compileOnly {
   695  		t.registerTest("os/user with tag osusergo",
   696  			&goTest{
   697  				variant: "osusergo",
   698  				timeout: 300 * time.Second,
   699  				tags:    []string{"osusergo"},
   700  				pkg:     "os/user",
   701  			})
   702  		t.registerTest("hash/maphash purego implementation",
   703  			&goTest{
   704  				variant: "purego",
   705  				timeout: 300 * time.Second,
   706  				tags:    []string{"purego"},
   707  				pkg:     "hash/maphash",
   708  			})
   709  	}
   710  
   711  	// Check that all crypto packages compile with the purego build tag.
   712  	t.registerTest("crypto with tag purego (build and vet only)", &goTest{
   713  		variant:  "purego",
   714  		tags:     []string{"purego"},
   715  		pkg:      "crypto/...",
   716  		runTests: "^$", // only ensure they compile
   717  	})
   718  
   719  	// Check that all crypto packages compile (and test correctly, in longmode) with fips.
   720  	if t.fipsSupported() {
   721  		// Test standard crypto packages with fips140=on.
   722  		t.registerTest("GOFIPS140=latest go test crypto/...", &goTest{
   723  			variant: "gofips140",
   724  			env:     []string{"GOFIPS140=latest"},
   725  			pkg:     "crypto/...",
   726  		})
   727  
   728  		// Test that earlier FIPS snapshots build.
   729  		// In long mode, test that they work too.
   730  		for _, version := range fipsVersions(t.short) {
   731  			suffix := " # (build and vet only)"
   732  			run := "^$" // only ensure they compile
   733  			if !t.short {
   734  				suffix = ""
   735  				run = ""
   736  			}
   737  			t.registerTest("GOFIPS140="+version+" go test crypto/..."+suffix, &goTest{
   738  				variant:  "gofips140-" + version,
   739  				pkg:      "crypto/...",
   740  				runTests: run,
   741  				env:      []string{"GOFIPS140=" + version, "GOMODCACHE=" + filepath.Join(workdir, "fips-"+version)},
   742  			})
   743  		}
   744  	}
   745  
   746  	// Test GOEXPERIMENT=jsonv2.
   747  	if !strings.Contains(goexperiment, "jsonv2") {
   748  		t.registerTest("GOEXPERIMENT=jsonv2 go test encoding/json/...", &goTest{
   749  			variant: "jsonv2",
   750  			env:     []string{"GOEXPERIMENT=jsonv2"},
   751  			pkg:     "encoding/json/...",
   752  		})
   753  	}
   754  
   755  	// Test ios/amd64 for the iOS simulator.
   756  	if goos == "darwin" && goarch == "amd64" && t.cgoEnabled {
   757  		t.registerTest("GOOS=ios on darwin/amd64",
   758  			&goTest{
   759  				variant:  "amd64ios",
   760  				timeout:  300 * time.Second,
   761  				runTests: "SystemRoots",
   762  				env:      []string{"GOOS=ios", "CGO_ENABLED=1"},
   763  				pkg:      "crypto/x509",
   764  			})
   765  	}
   766  
   767  	// GC debug mode tests. We only run these in long-test mode
   768  	// (with GO_TEST_SHORT=0) because this is just testing a
   769  	// non-critical debug setting.
   770  	if !t.compileOnly && !t.short {
   771  		t.registerTest("GODEBUG=gcstoptheworld=2 archive/zip",
   772  			&goTest{
   773  				variant: "runtime:gcstoptheworld2",
   774  				timeout: 300 * time.Second,
   775  				short:   true,
   776  				env:     []string{"GODEBUG=gcstoptheworld=2"},
   777  				pkg:     "archive/zip",
   778  			})
   779  		t.registerTest("GODEBUG=gccheckmark=1 runtime",
   780  			&goTest{
   781  				variant: "runtime:gccheckmark",
   782  				timeout: 300 * time.Second,
   783  				short:   true,
   784  				env:     []string{"GODEBUG=gccheckmark=1"},
   785  				pkg:     "runtime",
   786  			})
   787  	}
   788  
   789  	// morestack tests. We only run these in long-test mode
   790  	// (with GO_TEST_SHORT=0) because the runtime test is
   791  	// already quite long and mayMoreStackMove makes it about
   792  	// twice as slow.
   793  	if !t.compileOnly && !t.short {
   794  		// hooks is the set of maymorestack hooks to test with.
   795  		hooks := []string{"mayMoreStackPreempt", "mayMoreStackMove"}
   796  		// hookPkgs is the set of package patterns to apply
   797  		// the maymorestack hook to.
   798  		hookPkgs := []string{"runtime/...", "reflect", "sync"}
   799  		// unhookPkgs is the set of package patterns to
   800  		// exclude from hookPkgs.
   801  		unhookPkgs := []string{"runtime/testdata/..."}
   802  		for _, hook := range hooks {
   803  			// Construct the build flags to use the
   804  			// maymorestack hook in the compiler and
   805  			// assembler. We pass this via the GOFLAGS
   806  			// environment variable so that it applies to
   807  			// both the test itself and to binaries built
   808  			// by the test.
   809  			goFlagsList := []string{}
   810  			for _, flag := range []string{"-gcflags", "-asmflags"} {
   811  				for _, hookPkg := range hookPkgs {
   812  					goFlagsList = append(goFlagsList, flag+"="+hookPkg+"=-d=maymorestack=runtime."+hook)
   813  				}
   814  				for _, unhookPkg := range unhookPkgs {
   815  					goFlagsList = append(goFlagsList, flag+"="+unhookPkg+"=")
   816  				}
   817  			}
   818  			goFlags := strings.Join(goFlagsList, " ")
   819  
   820  			t.registerTest("maymorestack="+hook,
   821  				&goTest{
   822  					variant: hook,
   823  					timeout: 600 * time.Second,
   824  					short:   true,
   825  					env:     []string{"GOFLAGS=" + goFlags},
   826  					pkgs:    []string{"runtime", "reflect", "sync"},
   827  				})
   828  		}
   829  	}
   830  
   831  	// Test that internal linking of standard packages does not
   832  	// require libgcc. This ensures that we can install a Go
   833  	// release on a system that does not have a C compiler
   834  	// installed and still build Go programs (that don't use cgo).
   835  	for _, pkg := range cgoPackages {
   836  		if !t.internalLink() {
   837  			break
   838  		}
   839  
   840  		// ARM libgcc may be Thumb, which internal linking does not support.
   841  		if goarch == "arm" {
   842  			break
   843  		}
   844  
   845  		// What matters is that the tests build and start up.
   846  		// Skip expensive tests, especially x509 TestSystemRoots.
   847  		run := "^Test[^CS]"
   848  		if pkg == "net" {
   849  			run = "TestTCPStress"
   850  		}
   851  		t.registerTest("Testing without libgcc.",
   852  			&goTest{
   853  				variant:  "nolibgcc",
   854  				ldflags:  "-linkmode=internal -libgcc=none",
   855  				runTests: run,
   856  				pkg:      pkg,
   857  			})
   858  	}
   859  
   860  	// Stub out following test on alpine until 54354 resolved.
   861  	builderName := os.Getenv("GO_BUILDER_NAME")
   862  	disablePIE := strings.HasSuffix(builderName, "-alpine")
   863  
   864  	// Test internal linking of PIE binaries where it is supported.
   865  	if t.internalLinkPIE() && !disablePIE {
   866  		t.registerTest("internal linking, -buildmode=pie",
   867  			&goTest{
   868  				variant:   "pie_internal",
   869  				timeout:   60 * time.Second,
   870  				buildmode: "pie",
   871  				ldflags:   "-linkmode=internal",
   872  				env:       []string{"CGO_ENABLED=0"},
   873  				pkg:       "reflect",
   874  			})
   875  		t.registerTest("internal linking, -buildmode=pie",
   876  			&goTest{
   877  				variant:   "pie_internal",
   878  				timeout:   60 * time.Second,
   879  				buildmode: "pie",
   880  				ldflags:   "-linkmode=internal",
   881  				env:       []string{"CGO_ENABLED=0"},
   882  				pkg:       "crypto/internal/fips140test",
   883  				runTests:  "TestFIPSCheck",
   884  			})
   885  		// Also test a cgo package.
   886  		if t.cgoEnabled && t.internalLink() && !disablePIE {
   887  			t.registerTest("internal linking, -buildmode=pie",
   888  				&goTest{
   889  					variant:   "pie_internal",
   890  					timeout:   60 * time.Second,
   891  					buildmode: "pie",
   892  					ldflags:   "-linkmode=internal",
   893  					pkg:       "os/user",
   894  				})
   895  		}
   896  	}
   897  
   898  	if t.extLink() && !t.compileOnly {
   899  		if goos != "android" { // Android does not support non-PIE linking
   900  			t.registerTest("external linking, -buildmode=exe",
   901  				&goTest{
   902  					variant:   "exe_external",
   903  					timeout:   60 * time.Second,
   904  					buildmode: "exe",
   905  					ldflags:   "-linkmode=external",
   906  					env:       []string{"CGO_ENABLED=1"},
   907  					pkg:       "crypto/internal/fips140test",
   908  					runTests:  "TestFIPSCheck",
   909  				})
   910  		}
   911  		if t.externalLinkPIE() && !disablePIE {
   912  			t.registerTest("external linking, -buildmode=pie",
   913  				&goTest{
   914  					variant:   "pie_external",
   915  					timeout:   60 * time.Second,
   916  					buildmode: "pie",
   917  					ldflags:   "-linkmode=external",
   918  					env:       []string{"CGO_ENABLED=1"},
   919  					pkg:       "crypto/internal/fips140test",
   920  					runTests:  "TestFIPSCheck",
   921  				})
   922  		}
   923  	}
   924  
   925  	// sync tests
   926  	if t.hasParallelism() {
   927  		t.registerTest("sync -cpu=10",
   928  			&goTest{
   929  				variant: "cpu10",
   930  				timeout: 120 * time.Second,
   931  				cpu:     "10",
   932  				pkg:     "sync",
   933  			})
   934  	}
   935  
   936  	const cgoHeading = "Testing cgo"
   937  	if t.cgoEnabled {
   938  		t.registerCgoTests(cgoHeading)
   939  	}
   940  
   941  	if goos == "wasip1" {
   942  		t.registerTest("wasip1 host tests",
   943  			&goTest{
   944  				variant:   "host",
   945  				pkg:       "internal/runtime/wasitest",
   946  				timeout:   1 * time.Minute,
   947  				runOnHost: true,
   948  			})
   949  	}
   950  
   951  	// Only run the API check on fast development platforms.
   952  	// Every platform checks the API on every GOOS/GOARCH/CGO_ENABLED combination anyway,
   953  	// so we really only need to run this check once anywhere to get adequate coverage.
   954  	// To help developers avoid trybot-only failures, we try to run on typical developer machines
   955  	// which is darwin,linux,windows/amd64 and darwin/arm64.
   956  	//
   957  	// The same logic applies to the release notes that correspond to each api/next file.
   958  	if goos == "darwin" || ((goos == "linux" || goos == "windows") && goarch == "amd64") {
   959  		t.registerTest("API release note check", &goTest{variant: "check", pkg: "cmd/relnote", testFlags: []string{"-check"}})
   960  		t.registerTest("API check", &goTest{variant: "check", pkg: "cmd/api", timeout: 5 * time.Minute, testFlags: []string{"-check"}})
   961  	}
   962  
   963  	// Runtime CPU tests.
   964  	if !t.compileOnly && t.hasParallelism() {
   965  		for i := 1; i <= 4; i *= 2 {
   966  			t.registerTest(fmt.Sprintf("GOMAXPROCS=2 runtime -cpu=%d -quick", i),
   967  				&goTest{
   968  					variant:   "cpu" + strconv.Itoa(i),
   969  					timeout:   300 * time.Second,
   970  					cpu:       strconv.Itoa(i),
   971  					gcflags:   gogcflags,
   972  					short:     true,
   973  					testFlags: []string{"-quick"},
   974  					// We set GOMAXPROCS=2 in addition to -cpu=1,2,4 in order to test runtime bootstrap code,
   975  					// creation of first goroutines and first garbage collections in the parallel setting.
   976  					env: []string{"GOMAXPROCS=2"},
   977  					pkg: "runtime",
   978  				})
   979  		}
   980  	}
   981  
   982  	if t.raceDetectorSupported() && !t.msan && !t.asan {
   983  		// N.B. -race is incompatible with -msan and -asan.
   984  		t.registerRaceTests()
   985  	}
   986  
   987  	if goos != "android" && !t.iOS() {
   988  		// Only start multiple test dir shards on builders,
   989  		// where they get distributed to multiple machines.
   990  		// See issues 20141 and 31834.
   991  		nShards := 1
   992  		if os.Getenv("GO_BUILDER_NAME") != "" {
   993  			nShards = 10
   994  		}
   995  		if n, err := strconv.Atoi(os.Getenv("GO_TEST_SHARDS")); err == nil {
   996  			nShards = n
   997  		}
   998  		for shard := 0; shard < nShards; shard++ {
   999  			id := fmt.Sprintf("%d_%d", shard, nShards)
  1000  			t.registerTest("../test",
  1001  				&goTest{
  1002  					variant: id,
  1003  					// Include the variant even though there's no overlap in test names.
  1004  					// This makes the test target more clearly distinct in our build
  1005  					// results and is important for load-balancing test shards.
  1006  					omitVariant: false,
  1007  					pkg:         "cmd/internal/testdir",
  1008  					testFlags:   []string{fmt.Sprintf("-shard=%d", shard), fmt.Sprintf("-shards=%d", nShards)},
  1009  					runOnHost:   true,
  1010  				},
  1011  			)
  1012  		}
  1013  	}
  1014  }
  1015  
  1016  // addTest adds an arbitrary test callback to the test list.
  1017  //
  1018  // name must uniquely identify the test and heading must be non-empty.
  1019  func (t *tester) addTest(name, heading string, fn func(*distTest) error) {
  1020  	if t.testNames[name] {
  1021  		panic("duplicate registered test name " + name)
  1022  	}
  1023  	if heading == "" {
  1024  		panic("empty heading")
  1025  	}
  1026  	// Two simple checks for cases that would conflict with the fast path in registerTests.
  1027  	if !strings.Contains(name, ":") && heading != "Testing packages." {
  1028  		panic("empty variant is reserved exclusively for registerStdTest")
  1029  	} else if strings.HasSuffix(name, ":racebench") && heading != "Running benchmarks briefly." {
  1030  		panic("racebench variant is reserved exclusively for registerRaceBenchTest")
  1031  	}
  1032  	if t.testNames == nil {
  1033  		t.testNames = make(map[string]bool)
  1034  	}
  1035  	t.testNames[name] = true
  1036  	t.tests = append(t.tests, distTest{
  1037  		name:    name,
  1038  		heading: heading,
  1039  		fn:      fn,
  1040  	})
  1041  }
  1042  
  1043  type registerTestOpt interface {
  1044  	isRegisterTestOpt()
  1045  }
  1046  
  1047  // rtSkipFunc is a registerTest option that runs a skip check function before
  1048  // running the test.
  1049  type rtSkipFunc struct {
  1050  	skip func(*distTest) (string, bool) // Return message, true to skip the test
  1051  }
  1052  
  1053  func (rtSkipFunc) isRegisterTestOpt() {}
  1054  
  1055  // registerTest registers a test that runs the given goTest.
  1056  //
  1057  // Each Go package in goTest will have a corresponding test
  1058  // "<pkg>:<variant>", which must uniquely identify the test.
  1059  //
  1060  // heading and test.variant must be non-empty.
  1061  func (t *tester) registerTest(heading string, test *goTest, opts ...registerTestOpt) {
  1062  	var skipFunc func(*distTest) (string, bool)
  1063  	for _, opt := range opts {
  1064  		switch opt := opt.(type) {
  1065  		case rtSkipFunc:
  1066  			skipFunc = opt.skip
  1067  		}
  1068  	}
  1069  	// Register each test package as a separate test.
  1070  	register1 := func(test *goTest) {
  1071  		if test.variant == "" {
  1072  			panic("empty variant")
  1073  		}
  1074  		name := testName(test.pkg, test.variant)
  1075  		t.addTest(name, heading, func(dt *distTest) error {
  1076  			if skipFunc != nil {
  1077  				msg, skip := skipFunc(dt)
  1078  				if skip {
  1079  					test.printSkip(t, msg)
  1080  					return nil
  1081  				}
  1082  			}
  1083  			w := &work{dt: dt}
  1084  			w.cmd, w.flush = test.bgCommand(t, &w.out, &w.out)
  1085  			t.worklist = append(t.worklist, w)
  1086  			return nil
  1087  		})
  1088  	}
  1089  	if test.pkg != "" && len(test.pkgs) == 0 {
  1090  		// Common case. Avoid copying.
  1091  		register1(test)
  1092  		return
  1093  	}
  1094  	// TODO(dmitshur,austin): It might be better to unify the execution of 'go test pkg'
  1095  	// invocations for the same variant to be done with a single 'go test pkg1 pkg2 pkg3'
  1096  	// command, just like it's already done in registerStdTest and registerRaceBenchTest.
  1097  	// Those methods accumulate matched packages in stdMatches and benchMatches slices,
  1098  	// and we can extend that mechanism to work for all other equal variant registrations.
  1099  	// Do the simple thing to start with.
  1100  	for _, pkg := range test.packages() {
  1101  		test1 := *test
  1102  		test1.pkg, test1.pkgs = pkg, nil
  1103  		register1(&test1)
  1104  	}
  1105  }
  1106  
  1107  // dirCmd constructs a Cmd intended to be run in the foreground.
  1108  // The command will be run in dir, and Stdout and Stderr will go to os.Stdout
  1109  // and os.Stderr.
  1110  func (t *tester) dirCmd(dir string, cmdline ...interface{}) *exec.Cmd {
  1111  	bin, args := flattenCmdline(cmdline)
  1112  	cmd := exec.Command(bin, args...)
  1113  	if filepath.IsAbs(dir) {
  1114  		setDir(cmd, dir)
  1115  	} else {
  1116  		setDir(cmd, filepath.Join(goroot, dir))
  1117  	}
  1118  	cmd.Stdout = os.Stdout
  1119  	cmd.Stderr = os.Stderr
  1120  	if vflag > 1 {
  1121  		errprintf("%#q\n", cmd)
  1122  	}
  1123  	return cmd
  1124  }
  1125  
  1126  // flattenCmdline flattens a mixture of string and []string as single list
  1127  // and then interprets it as a command line: first element is binary, then args.
  1128  func flattenCmdline(cmdline []interface{}) (bin string, args []string) {
  1129  	var list []string
  1130  	for _, x := range cmdline {
  1131  		switch x := x.(type) {
  1132  		case string:
  1133  			list = append(list, x)
  1134  		case []string:
  1135  			list = append(list, x...)
  1136  		default:
  1137  			panic("invalid dirCmd argument type: " + reflect.TypeOf(x).String())
  1138  		}
  1139  	}
  1140  
  1141  	bin = list[0]
  1142  	if !filepath.IsAbs(bin) {
  1143  		panic("command is not absolute: " + bin)
  1144  	}
  1145  	return bin, list[1:]
  1146  }
  1147  
  1148  func (t *tester) iOS() bool {
  1149  	return goos == "ios"
  1150  }
  1151  
  1152  func (t *tester) out(v string) {
  1153  	if t.json {
  1154  		return
  1155  	}
  1156  	if t.banner == "" {
  1157  		return
  1158  	}
  1159  	fmt.Println("\n" + t.banner + v)
  1160  }
  1161  
  1162  // extLink reports whether the current goos/goarch supports
  1163  // external linking.
  1164  func (t *tester) extLink() bool {
  1165  	if !cgoEnabled[goos+"/"+goarch] {
  1166  		return false
  1167  	}
  1168  	if goarch == "ppc64" && goos != "aix" {
  1169  		return false
  1170  	}
  1171  	return true
  1172  }
  1173  
  1174  func (t *tester) internalLink() bool {
  1175  	if gohostos == "dragonfly" {
  1176  		// linkmode=internal fails on dragonfly since errno is a TLS relocation.
  1177  		return false
  1178  	}
  1179  	if goos == "android" {
  1180  		return false
  1181  	}
  1182  	if goos == "ios" {
  1183  		return false
  1184  	}
  1185  	if goos == "windows" && goarch == "arm64" {
  1186  		return false
  1187  	}
  1188  	// Internally linking cgo is incomplete on some architectures.
  1189  	// https://golang.org/issue/10373
  1190  	// https://golang.org/issue/14449
  1191  	if goarch == "mips64" || goarch == "mips64le" || goarch == "mips" || goarch == "mipsle" || goarch == "riscv64" {
  1192  		return false
  1193  	}
  1194  	if goos == "aix" {
  1195  		// linkmode=internal isn't supported.
  1196  		return false
  1197  	}
  1198  	if t.msan || t.asan {
  1199  		// linkmode=internal isn't supported by msan or asan.
  1200  		return false
  1201  	}
  1202  	return true
  1203  }
  1204  
  1205  func (t *tester) internalLinkPIE() bool {
  1206  	if t.msan || t.asan {
  1207  		// linkmode=internal isn't supported by msan or asan.
  1208  		return false
  1209  	}
  1210  	switch goos + "-" + goarch {
  1211  	case "darwin-amd64", "darwin-arm64",
  1212  		"linux-amd64", "linux-arm64", "linux-loong64", "linux-ppc64le",
  1213  		"android-arm64",
  1214  		"windows-amd64", "windows-386", "windows-arm":
  1215  		return true
  1216  	}
  1217  	return false
  1218  }
  1219  
  1220  func (t *tester) externalLinkPIE() bool {
  1221  	// General rule is if -buildmode=pie and -linkmode=external both work, then they work together.
  1222  	// Handle exceptions and then fall back to the general rule.
  1223  	switch goos + "-" + goarch {
  1224  	case "linux-s390x":
  1225  		return true
  1226  	}
  1227  	return t.internalLinkPIE() && t.extLink()
  1228  }
  1229  
  1230  // supportedBuildMode reports whether the given build mode is supported.
  1231  func (t *tester) supportedBuildmode(mode string) bool {
  1232  	switch mode {
  1233  	case "c-archive", "c-shared", "shared", "plugin", "pie":
  1234  	default:
  1235  		fatalf("internal error: unknown buildmode %s", mode)
  1236  		return false
  1237  	}
  1238  
  1239  	return buildModeSupported("gc", mode, goos, goarch)
  1240  }
  1241  
  1242  func (t *tester) registerCgoTests(heading string) {
  1243  	cgoTest := func(variant string, subdir, linkmode, buildmode string, opts ...registerTestOpt) *goTest {
  1244  		gt := &goTest{
  1245  			variant:   variant,
  1246  			pkg:       "cmd/cgo/internal/" + subdir,
  1247  			buildmode: buildmode,
  1248  		}
  1249  		var ldflags []string
  1250  		if linkmode != "auto" {
  1251  			// "auto" is the default, so avoid cluttering the command line for "auto"
  1252  			ldflags = append(ldflags, "-linkmode="+linkmode)
  1253  		}
  1254  
  1255  		if linkmode == "internal" {
  1256  			gt.tags = append(gt.tags, "internal")
  1257  			if buildmode == "pie" {
  1258  				gt.tags = append(gt.tags, "internal_pie")
  1259  			}
  1260  		}
  1261  		if buildmode == "static" {
  1262  			// This isn't actually a Go buildmode, just a convenient way to tell
  1263  			// cgoTest we want static linking.
  1264  			gt.buildmode = ""
  1265  			if linkmode == "external" {
  1266  				ldflags = append(ldflags, `-extldflags "-static -pthread"`)
  1267  			} else if linkmode == "auto" {
  1268  				gt.env = append(gt.env, "CGO_LDFLAGS=-static -pthread")
  1269  			} else {
  1270  				panic("unknown linkmode with static build: " + linkmode)
  1271  			}
  1272  			gt.tags = append(gt.tags, "static")
  1273  		}
  1274  		gt.ldflags = strings.Join(ldflags, " ")
  1275  
  1276  		t.registerTest(heading, gt, opts...)
  1277  		return gt
  1278  	}
  1279  
  1280  	// test, testtls, and testnocgo are run with linkmode="auto", buildmode=""
  1281  	// as part of go test cmd. Here we only have to register the non-default
  1282  	// build modes of these tests.
  1283  
  1284  	// Stub out various buildmode=pie tests  on alpine until 54354 resolved.
  1285  	builderName := os.Getenv("GO_BUILDER_NAME")
  1286  	disablePIE := strings.HasSuffix(builderName, "-alpine")
  1287  
  1288  	if t.internalLink() {
  1289  		cgoTest("internal", "test", "internal", "")
  1290  	}
  1291  
  1292  	os := gohostos
  1293  	p := gohostos + "/" + goarch
  1294  	switch {
  1295  	case os == "darwin", os == "windows":
  1296  		if !t.extLink() {
  1297  			break
  1298  		}
  1299  		// test linkmode=external, but __thread not supported, so skip testtls.
  1300  		cgoTest("external", "test", "external", "")
  1301  
  1302  		gt := cgoTest("external-s", "test", "external", "")
  1303  		gt.ldflags += " -s"
  1304  
  1305  		if t.supportedBuildmode("pie") && !disablePIE {
  1306  			cgoTest("auto-pie", "test", "auto", "pie")
  1307  			if t.internalLink() && t.internalLinkPIE() {
  1308  				cgoTest("internal-pie", "test", "internal", "pie")
  1309  			}
  1310  		}
  1311  
  1312  	case os == "aix", os == "android", os == "dragonfly", os == "freebsd", os == "linux", os == "netbsd", os == "openbsd":
  1313  		gt := cgoTest("external-g0", "test", "external", "")
  1314  		gt.env = append(gt.env, "CGO_CFLAGS=-g0 -fdiagnostics-color")
  1315  
  1316  		cgoTest("external", "testtls", "external", "")
  1317  		switch {
  1318  		case os == "aix":
  1319  			// no static linking
  1320  		case p == "freebsd/arm":
  1321  			// -fPIC compiled tls code will use __tls_get_addr instead
  1322  			// of __aeabi_read_tp, however, on FreeBSD/ARM, __tls_get_addr
  1323  			// is implemented in rtld-elf, so -fPIC isn't compatible with
  1324  			// static linking on FreeBSD/ARM with clang. (cgo depends on
  1325  			// -fPIC fundamentally.)
  1326  		default:
  1327  			// Check for static linking support
  1328  			var staticCheck rtSkipFunc
  1329  			ccName := compilerEnvLookup("CC", defaultcc, goos, goarch)
  1330  			cc, err := exec.LookPath(ccName)
  1331  			if err != nil {
  1332  				staticCheck.skip = func(*distTest) (string, bool) {
  1333  					return fmt.Sprintf("$CC (%q) not found, skip cgo static linking test.", ccName), true
  1334  				}
  1335  			} else {
  1336  				cmd := t.dirCmd("src/cmd/cgo/internal/test", cc, "-xc", "-o", "/dev/null", "-static", "-")
  1337  				cmd.Stdin = strings.NewReader("int main() {}")
  1338  				cmd.Stdout, cmd.Stderr = nil, nil // Discard output
  1339  				if err := cmd.Run(); err != nil {
  1340  					// Skip these tests
  1341  					staticCheck.skip = func(*distTest) (string, bool) {
  1342  						return "No support for static linking found (lacks libc.a?), skip cgo static linking test.", true
  1343  					}
  1344  				}
  1345  			}
  1346  
  1347  			// Doing a static link with boringcrypto gets
  1348  			// a C linker warning on Linux.
  1349  			// in function `bio_ip_and_port_to_socket_and_addr':
  1350  			// warning: Using 'getaddrinfo' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
  1351  			if staticCheck.skip == nil && goos == "linux" && strings.Contains(goexperiment, "boringcrypto") {
  1352  				staticCheck.skip = func(*distTest) (string, bool) {
  1353  					return "skipping static linking check on Linux when using boringcrypto to avoid C linker warning about getaddrinfo", true
  1354  				}
  1355  			}
  1356  
  1357  			// Static linking tests
  1358  			if goos != "android" && p != "netbsd/arm" && !t.msan && !t.asan {
  1359  				// TODO(#56629): Why does this fail on netbsd-arm?
  1360  				// TODO(#70080): Why does this fail with msan?
  1361  				// asan doesn't support static linking (this is an explicit build error on the C side).
  1362  				cgoTest("static", "testtls", "external", "static", staticCheck)
  1363  			}
  1364  			cgoTest("external", "testnocgo", "external", "", staticCheck)
  1365  			if goos != "android" && !t.msan && !t.asan {
  1366  				// TODO(#70080): Why does this fail with msan?
  1367  				// asan doesn't support static linking (this is an explicit build error on the C side).
  1368  				cgoTest("static", "testnocgo", "external", "static", staticCheck)
  1369  				cgoTest("static", "test", "external", "static", staticCheck)
  1370  				// -static in CGO_LDFLAGS triggers a different code path
  1371  				// than -static in -extldflags, so test both.
  1372  				// See issue #16651.
  1373  				if goarch != "loong64" && !t.msan && !t.asan {
  1374  					// TODO(#56623): Why does this fail on loong64?
  1375  					cgoTest("auto-static", "test", "auto", "static", staticCheck)
  1376  				}
  1377  			}
  1378  
  1379  			// PIE linking tests
  1380  			if t.supportedBuildmode("pie") && !disablePIE {
  1381  				cgoTest("auto-pie", "test", "auto", "pie")
  1382  				if t.internalLink() && t.internalLinkPIE() {
  1383  					cgoTest("internal-pie", "test", "internal", "pie")
  1384  				}
  1385  				cgoTest("auto-pie", "testtls", "auto", "pie")
  1386  				cgoTest("auto-pie", "testnocgo", "auto", "pie")
  1387  			}
  1388  		}
  1389  	}
  1390  }
  1391  
  1392  // runPending runs pending test commands, in parallel, emitting headers as appropriate.
  1393  // When finished, it emits header for nextTest, which is going to run after the
  1394  // pending commands are done (and runPending returns).
  1395  // A test should call runPending if it wants to make sure that it is not
  1396  // running in parallel with earlier tests, or if it has some other reason
  1397  // for needing the earlier tests to be done.
  1398  func (t *tester) runPending(nextTest *distTest) {
  1399  	worklist := t.worklist
  1400  	t.worklist = nil
  1401  	for _, w := range worklist {
  1402  		w.start = make(chan bool)
  1403  		w.end = make(chan struct{})
  1404  		// w.cmd must be set up to write to w.out. We can't check that, but we
  1405  		// can check for easy mistakes.
  1406  		if w.cmd.Stdout == nil || w.cmd.Stdout == os.Stdout || w.cmd.Stderr == nil || w.cmd.Stderr == os.Stderr {
  1407  			panic("work.cmd.Stdout/Stderr must be redirected")
  1408  		}
  1409  		go func(w *work) {
  1410  			if !<-w.start {
  1411  				timelog("skip", w.dt.name)
  1412  				w.printSkip(t, "skipped due to earlier error")
  1413  			} else {
  1414  				timelog("start", w.dt.name)
  1415  				w.err = w.cmd.Run()
  1416  				if w.flush != nil {
  1417  					w.flush()
  1418  				}
  1419  				if w.err != nil {
  1420  					if isUnsupportedVMASize(w) {
  1421  						timelog("skip", w.dt.name)
  1422  						w.out.Reset()
  1423  						w.printSkip(t, "skipped due to unsupported VMA")
  1424  						w.err = nil
  1425  					}
  1426  				}
  1427  			}
  1428  			timelog("end", w.dt.name)
  1429  			w.end <- struct{}{}
  1430  		}(w)
  1431  	}
  1432  
  1433  	maxbg := maxbg
  1434  	// for runtime.NumCPU() < 4 ||  runtime.GOMAXPROCS(0) == 1, do not change maxbg.
  1435  	// Because there is not enough CPU to parallel the testing of multiple packages.
  1436  	if runtime.NumCPU() > 4 && runtime.GOMAXPROCS(0) != 1 {
  1437  		for _, w := range worklist {
  1438  			// See go.dev/issue/65164
  1439  			// because GOMAXPROCS=2 runtime CPU usage is low,
  1440  			// so increase maxbg to avoid slowing down execution with low CPU usage.
  1441  			// This makes testing a single package slower,
  1442  			// but testing multiple packages together faster.
  1443  			if strings.Contains(w.dt.heading, "GOMAXPROCS=2 runtime") {
  1444  				maxbg = runtime.NumCPU()
  1445  				break
  1446  			}
  1447  		}
  1448  	}
  1449  
  1450  	started := 0
  1451  	ended := 0
  1452  	var last *distTest
  1453  	for ended < len(worklist) {
  1454  		for started < len(worklist) && started-ended < maxbg {
  1455  			w := worklist[started]
  1456  			started++
  1457  			w.start <- !t.failed || t.keepGoing
  1458  		}
  1459  		w := worklist[ended]
  1460  		dt := w.dt
  1461  		if t.lastHeading != dt.heading {
  1462  			t.lastHeading = dt.heading
  1463  			t.out(dt.heading)
  1464  		}
  1465  		if dt != last {
  1466  			// Assumes all the entries for a single dt are in one worklist.
  1467  			last = w.dt
  1468  			if vflag > 0 {
  1469  				fmt.Printf("# go tool dist test -run=^%s$\n", dt.name)
  1470  			}
  1471  		}
  1472  		if vflag > 1 {
  1473  			errprintf("%#q\n", w.cmd)
  1474  		}
  1475  		ended++
  1476  		<-w.end
  1477  		os.Stdout.Write(w.out.Bytes())
  1478  		// We no longer need the output, so drop the buffer.
  1479  		w.out = bytes.Buffer{}
  1480  		if w.err != nil {
  1481  			log.Printf("Failed: %v", w.err)
  1482  			t.failed = true
  1483  		}
  1484  	}
  1485  	if t.failed && !t.keepGoing {
  1486  		fatalf("FAILED")
  1487  	}
  1488  
  1489  	if dt := nextTest; dt != nil {
  1490  		if t.lastHeading != dt.heading {
  1491  			t.lastHeading = dt.heading
  1492  			t.out(dt.heading)
  1493  		}
  1494  		if vflag > 0 {
  1495  			fmt.Printf("# go tool dist test -run=^%s$\n", dt.name)
  1496  		}
  1497  	}
  1498  }
  1499  
  1500  func (t *tester) hasBash() bool {
  1501  	switch gohostos {
  1502  	case "windows", "plan9":
  1503  		return false
  1504  	}
  1505  	return true
  1506  }
  1507  
  1508  // hasParallelism is a copy of the function
  1509  // internal/testenv.HasParallelism, which can't be used here
  1510  // because cmd/dist can not import internal packages during bootstrap.
  1511  func (t *tester) hasParallelism() bool {
  1512  	switch goos {
  1513  	case "js", "wasip1":
  1514  		return false
  1515  	}
  1516  	return true
  1517  }
  1518  
  1519  func (t *tester) raceDetectorSupported() bool {
  1520  	if gohostos != goos {
  1521  		return false
  1522  	}
  1523  	if !t.cgoEnabled {
  1524  		return false
  1525  	}
  1526  	if !raceDetectorSupported(goos, goarch) {
  1527  		return false
  1528  	}
  1529  	// The race detector doesn't work on Alpine Linux:
  1530  	// golang.org/issue/14481
  1531  	if isAlpineLinux() {
  1532  		return false
  1533  	}
  1534  	// NetBSD support is unfinished.
  1535  	// golang.org/issue/26403
  1536  	if goos == "netbsd" {
  1537  		return false
  1538  	}
  1539  	return true
  1540  }
  1541  
  1542  func isAlpineLinux() bool {
  1543  	if runtime.GOOS != "linux" {
  1544  		return false
  1545  	}
  1546  	fi, err := os.Lstat("/etc/alpine-release")
  1547  	return err == nil && fi.Mode().IsRegular()
  1548  }
  1549  
  1550  func (t *tester) registerRaceTests() {
  1551  	hdr := "Testing race detector"
  1552  	t.registerTest(hdr,
  1553  		&goTest{
  1554  			variant:  "race",
  1555  			race:     true,
  1556  			runTests: "Output",
  1557  			pkg:      "runtime/race",
  1558  		})
  1559  	t.registerTest(hdr,
  1560  		&goTest{
  1561  			variant:  "race",
  1562  			race:     true,
  1563  			runTests: "TestParse|TestEcho|TestStdinCloseRace|TestClosedPipeRace|TestTypeRace|TestFdRace|TestFdReadRace|TestFileCloseRace",
  1564  			pkgs:     []string{"flag", "net", "os", "os/exec", "encoding/gob"},
  1565  		})
  1566  	// We don't want the following line, because it
  1567  	// slows down all.bash (by 10 seconds on my laptop).
  1568  	// The race builder should catch any error here, but doesn't.
  1569  	// TODO(iant): Figure out how to catch this.
  1570  	// t.registerTest(hdr, &goTest{variant: "race", race: true, runTests: "TestParallelTest", pkg: "cmd/go"})
  1571  	if t.cgoEnabled {
  1572  		// Building cmd/cgo/internal/test takes a long time.
  1573  		// There are already cgo-enabled packages being tested with the race detector.
  1574  		// We shouldn't need to redo all of cmd/cgo/internal/test too.
  1575  		// The race builder will take care of this.
  1576  		// t.registerTest(hdr, &goTest{variant: "race", race: true, env: []string{"GOTRACEBACK=2"}, pkg: "cmd/cgo/internal/test"})
  1577  	}
  1578  	if t.extLink() {
  1579  		// Test with external linking; see issue 9133.
  1580  		t.registerTest(hdr,
  1581  			&goTest{
  1582  				variant:  "race-external",
  1583  				race:     true,
  1584  				ldflags:  "-linkmode=external",
  1585  				runTests: "TestParse|TestEcho|TestStdinCloseRace",
  1586  				pkgs:     []string{"flag", "os/exec"},
  1587  			})
  1588  	}
  1589  }
  1590  
  1591  // cgoPackages is the standard packages that use cgo.
  1592  var cgoPackages = []string{
  1593  	"net",
  1594  	"os/user",
  1595  }
  1596  
  1597  var funcBenchmark = []byte("\nfunc Benchmark")
  1598  
  1599  // packageHasBenchmarks reports whether pkg has benchmarks.
  1600  // On any error, it conservatively returns true.
  1601  //
  1602  // This exists just to eliminate work on the builders, since compiling
  1603  // a test in race mode just to discover it has no benchmarks costs a
  1604  // second or two per package, and this function returns false for
  1605  // about 100 packages.
  1606  func (t *tester) packageHasBenchmarks(pkg string) bool {
  1607  	pkgDir := filepath.Join(goroot, "src", pkg)
  1608  	d, err := os.Open(pkgDir)
  1609  	if err != nil {
  1610  		return true // conservatively
  1611  	}
  1612  	defer d.Close()
  1613  	names, err := d.Readdirnames(-1)
  1614  	if err != nil {
  1615  		return true // conservatively
  1616  	}
  1617  	for _, name := range names {
  1618  		if !strings.HasSuffix(name, "_test.go") {
  1619  			continue
  1620  		}
  1621  		slurp, err := os.ReadFile(filepath.Join(pkgDir, name))
  1622  		if err != nil {
  1623  			return true // conservatively
  1624  		}
  1625  		if bytes.Contains(slurp, funcBenchmark) {
  1626  			return true
  1627  		}
  1628  	}
  1629  	return false
  1630  }
  1631  
  1632  // makeGOROOTUnwritable makes all $GOROOT files & directories non-writable to
  1633  // check that no tests accidentally write to $GOROOT.
  1634  func (t *tester) makeGOROOTUnwritable() (undo func()) {
  1635  	dir := os.Getenv("GOROOT")
  1636  	if dir == "" {
  1637  		panic("GOROOT not set")
  1638  	}
  1639  
  1640  	type pathMode struct {
  1641  		path string
  1642  		mode os.FileMode
  1643  	}
  1644  	var dirs []pathMode // in lexical order
  1645  
  1646  	undo = func() {
  1647  		for i := range dirs {
  1648  			os.Chmod(dirs[i].path, dirs[i].mode) // best effort
  1649  		}
  1650  	}
  1651  
  1652  	filepath.WalkDir(dir, func(path string, d fs.DirEntry, err error) error {
  1653  		if suffix := strings.TrimPrefix(path, dir+string(filepath.Separator)); suffix != "" {
  1654  			if suffix == ".git" {
  1655  				// Leave Git metadata in whatever state it was in. It may contain a lot
  1656  				// of files, and it is highly unlikely that a test will try to modify
  1657  				// anything within that directory.
  1658  				return filepath.SkipDir
  1659  			}
  1660  		}
  1661  		if err != nil {
  1662  			return nil
  1663  		}
  1664  
  1665  		info, err := d.Info()
  1666  		if err != nil {
  1667  			return nil
  1668  		}
  1669  
  1670  		mode := info.Mode()
  1671  		if mode&0222 != 0 && (mode.IsDir() || mode.IsRegular()) {
  1672  			dirs = append(dirs, pathMode{path, mode})
  1673  		}
  1674  		return nil
  1675  	})
  1676  
  1677  	// Run over list backward to chmod children before parents.
  1678  	for i := len(dirs) - 1; i >= 0; i-- {
  1679  		err := os.Chmod(dirs[i].path, dirs[i].mode&^0222)
  1680  		if err != nil {
  1681  			dirs = dirs[i:] // Only undo what we did so far.
  1682  			undo()
  1683  			fatalf("failed to make GOROOT read-only: %v", err)
  1684  		}
  1685  	}
  1686  
  1687  	return undo
  1688  }
  1689  
  1690  // raceDetectorSupported is a copy of the function
  1691  // internal/platform.RaceDetectorSupported, which can't be used here
  1692  // because cmd/dist can not import internal packages during bootstrap.
  1693  // The race detector only supports 48-bit VMA on arm64. But we don't have
  1694  // a good solution to check VMA size (see https://go.dev/issue/29948).
  1695  // raceDetectorSupported will always return true for arm64. But race
  1696  // detector tests may abort on non 48-bit VMA configuration, the tests
  1697  // will be marked as "skipped" in this case.
  1698  func raceDetectorSupported(goos, goarch string) bool {
  1699  	switch goos {
  1700  	case "linux":
  1701  		return goarch == "amd64" || goarch == "ppc64le" || goarch == "arm64" || goarch == "s390x" || goarch == "loong64"
  1702  	case "darwin":
  1703  		return goarch == "amd64" || goarch == "arm64"
  1704  	case "freebsd", "netbsd", "windows":
  1705  		return goarch == "amd64"
  1706  	default:
  1707  		return false
  1708  	}
  1709  }
  1710  
  1711  // buildModeSupported is a copy of the function
  1712  // internal/platform.BuildModeSupported, which can't be used here
  1713  // because cmd/dist can not import internal packages during bootstrap.
  1714  func buildModeSupported(compiler, buildmode, goos, goarch string) bool {
  1715  	if compiler == "gccgo" {
  1716  		return true
  1717  	}
  1718  
  1719  	platform := goos + "/" + goarch
  1720  
  1721  	switch buildmode {
  1722  	case "archive":
  1723  		return true
  1724  
  1725  	case "c-archive":
  1726  		switch goos {
  1727  		case "aix", "darwin", "ios", "windows":
  1728  			return true
  1729  		case "linux":
  1730  			switch goarch {
  1731  			case "386", "amd64", "arm", "armbe", "arm64", "arm64be", "loong64", "ppc64le", "riscv64", "s390x":
  1732  				// linux/ppc64 not supported because it does
  1733  				// not support external linking mode yet.
  1734  				return true
  1735  			default:
  1736  				// Other targets do not support -shared,
  1737  				// per ParseFlags in
  1738  				// cmd/compile/internal/base/flag.go.
  1739  				// For c-archive the Go tool passes -shared,
  1740  				// so that the result is suitable for inclusion
  1741  				// in a PIE or shared library.
  1742  				return false
  1743  			}
  1744  		case "freebsd":
  1745  			return goarch == "amd64"
  1746  		}
  1747  		return false
  1748  
  1749  	case "c-shared":
  1750  		switch platform {
  1751  		case "linux/amd64", "linux/arm", "linux/arm64", "linux/loong64", "linux/386", "linux/ppc64le", "linux/riscv64", "linux/s390x",
  1752  			"android/amd64", "android/arm", "android/arm64", "android/386",
  1753  			"freebsd/amd64",
  1754  			"darwin/amd64", "darwin/arm64",
  1755  			"windows/amd64", "windows/386", "windows/arm64",
  1756  			"wasip1/wasm":
  1757  			return true
  1758  		}
  1759  		return false
  1760  
  1761  	case "default":
  1762  		return true
  1763  
  1764  	case "exe":
  1765  		return true
  1766  
  1767  	case "pie":
  1768  		switch platform {
  1769  		case "linux/386", "linux/amd64", "linux/arm", "linux/arm64", "linux/loong64", "linux/ppc64le", "linux/riscv64", "linux/s390x",
  1770  			"android/amd64", "android/arm", "android/arm64", "android/386",
  1771  			"freebsd/amd64",
  1772  			"darwin/amd64", "darwin/arm64",
  1773  			"ios/amd64", "ios/arm64",
  1774  			"aix/ppc64",
  1775  			"openbsd/arm64",
  1776  			"windows/386", "windows/amd64", "windows/arm", "windows/arm64":
  1777  			return true
  1778  		}
  1779  		return false
  1780  
  1781  	case "shared":
  1782  		switch platform {
  1783  		case "linux/386", "linux/amd64", "linux/arm", "linux/arm64", "linux/ppc64le", "linux/s390x":
  1784  			return true
  1785  		}
  1786  		return false
  1787  
  1788  	case "plugin":
  1789  		switch platform {
  1790  		case "linux/amd64", "linux/arm", "linux/arm64", "linux/386", "linux/loong64", "linux/riscv64", "linux/s390x", "linux/ppc64le",
  1791  			"android/amd64", "android/386",
  1792  			"darwin/amd64", "darwin/arm64",
  1793  			"freebsd/amd64":
  1794  			return true
  1795  		}
  1796  		return false
  1797  
  1798  	default:
  1799  		return false
  1800  	}
  1801  }
  1802  
  1803  // isUnsupportedVMASize reports whether the failure is caused by an unsupported
  1804  // VMA for the race detector (for example, running the race detector on an
  1805  // arm64 machine configured with 39-bit VMA).
  1806  func isUnsupportedVMASize(w *work) bool {
  1807  	unsupportedVMA := []byte("unsupported VMA range")
  1808  	return strings.Contains(w.dt.name, ":race") && bytes.Contains(w.out.Bytes(), unsupportedVMA)
  1809  }
  1810  
  1811  // isEnvSet reports whether the environment variable evar is
  1812  // set in the environment.
  1813  func isEnvSet(evar string) bool {
  1814  	evarEq := evar + "="
  1815  	for _, e := range os.Environ() {
  1816  		if strings.HasPrefix(e, evarEq) {
  1817  			return true
  1818  		}
  1819  	}
  1820  	return false
  1821  }
  1822  
  1823  func (t *tester) fipsSupported() bool {
  1824  	// Keep this in sync with [crypto/internal/fips140.Supported].
  1825  
  1826  	// Use GOFIPS140 or GOEXPERIMENT=boringcrypto, but not both.
  1827  	if strings.Contains(goexperiment, "boringcrypto") {
  1828  		return false
  1829  	}
  1830  
  1831  	// If this goos/goarch does not support FIPS at all, return no versions.
  1832  	// The logic here matches crypto/internal/fips140/check.Supported for now.
  1833  	// In the future, if some snapshots add support for these, we will have
  1834  	// to make a decision on a per-version basis.
  1835  	switch {
  1836  	case goarch == "wasm",
  1837  		goos == "windows" && goarch == "386",
  1838  		goos == "windows" && goarch == "arm",
  1839  		goos == "openbsd",
  1840  		goos == "aix":
  1841  		return false
  1842  	}
  1843  
  1844  	// For now, FIPS+ASAN doesn't need to work.
  1845  	// If this is made to work, also re-enable the test in check_test.go.
  1846  	if t.asan {
  1847  		return false
  1848  	}
  1849  
  1850  	return true
  1851  }
  1852  
  1853  // fipsVersions returns the list of versions available in lib/fips140.
  1854  func fipsVersions(short bool) []string {
  1855  	var versions []string
  1856  	zips, err := filepath.Glob(filepath.Join(goroot, "lib/fips140/*.zip"))
  1857  	if err != nil {
  1858  		fatalf("%v", err)
  1859  	}
  1860  	for _, zip := range zips {
  1861  		versions = append(versions, strings.TrimSuffix(filepath.Base(zip), ".zip"))
  1862  	}
  1863  	txts, err := filepath.Glob(filepath.Join(goroot, "lib/fips140/*.txt"))
  1864  	if err != nil {
  1865  		fatalf("%v", err)
  1866  	}
  1867  	for _, txt := range txts {
  1868  		versions = append(versions, strings.TrimSuffix(filepath.Base(txt), ".txt"))
  1869  	}
  1870  	return versions
  1871  }
  1872  

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