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

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