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// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main_test
import (
"cmd/go/internal/cfg"
"cmd/go/internal/script"
"cmd/go/internal/script/scripttest"
"errors"
"fmt"
"internal/buildcfg"
"internal/platform"
"internal/testenv"
"os"
"os/exec"
"path/filepath"
"runtime"
"runtime/debug"
"strings"
"sync"
)
func scriptConditions() map[string]script.Cond {
conds := scripttest.DefaultConds()
add := func(name string, cond script.Cond) {
if _, ok := conds[name]; ok {
panic(fmt.Sprintf("condition %q is already registered", name))
}
conds[name] = cond
}
lazyBool := func(summary string, f func() bool) script.Cond {
return script.OnceCondition(summary, func() (bool, error) { return f(), nil })
}
add("abscc", script.Condition("default $CC path is absolute and exists", defaultCCIsAbsolute))
add("asan", sysCondition("-asan", platform.ASanSupported, true))
add("buildmode", script.PrefixCondition("go supports -buildmode=<suffix>", hasBuildmode))
add("case-sensitive", script.OnceCondition("$WORK filesystem is case-sensitive", isCaseSensitive))
add("cc", script.PrefixCondition("go env CC = <suffix> (ignoring the go/env file)", ccIs))
add("cgo", script.BoolCondition("host CGO_ENABLED", testenv.HasCGO()))
add("cgolinkext", script.Condition("platform requires external linking for cgo", cgoLinkExt))
add("cross", script.BoolCondition("cmd/go GOOS/GOARCH != GOHOSTOS/GOHOSTARCH", goHostOS != runtime.GOOS || goHostArch != runtime.GOARCH))
add("fuzz", sysCondition("-fuzz", platform.FuzzSupported, false))
add("fuzz-instrumented", sysCondition("-fuzz with instrumentation", platform.FuzzInstrumented, false))
add("git", lazyBool("the 'git' executable exists and provides the standard CLI", hasWorkingGit))
add("GODEBUG", script.PrefixCondition("GODEBUG contains <suffix>", hasGodebug))
add("GOEXPERIMENT", script.PrefixCondition("GOEXPERIMENT <suffix> is enabled", hasGoexperiment))
add("go-builder", script.BoolCondition("GO_BUILDER_NAME is non-empty", testenv.Builder() != ""))
add("link", lazyBool("testenv.HasLink()", testenv.HasLink))
add("mismatched-goroot", script.Condition("test's GOROOT_FINAL does not match the real GOROOT", isMismatchedGoroot))
add("msan", sysCondition("-msan", platform.MSanSupported, true))
add("mustlinkext", script.Condition("platform always requires external linking", mustLinkExt))
add("net", script.PrefixCondition("can connect to external network host <suffix>", hasNet))
add("race", sysCondition("-race", platform.RaceDetectorSupported, true))
add("symlink", lazyBool("testenv.HasSymlink()", testenv.HasSymlink))
add("trimpath", script.OnceCondition("test binary was built with -trimpath", isTrimpath))
return conds
}
func defaultCCIsAbsolute(s *script.State) (bool, error) {
GOOS, _ := s.LookupEnv("GOOS")
GOARCH, _ := s.LookupEnv("GOARCH")
defaultCC := cfg.DefaultCC(GOOS, GOARCH)
if filepath.IsAbs(defaultCC) {
if _, err := exec.LookPath(defaultCC); err == nil {
return true, nil
}
}
return false, nil
}
func ccIs(s *script.State, want string) (bool, error) {
CC, _ := s.LookupEnv("CC")
if CC != "" {
return CC == want, nil
}
GOOS, _ := s.LookupEnv("GOOS")
GOARCH, _ := s.LookupEnv("GOARCH")
return cfg.DefaultCC(GOOS, GOARCH) == want, nil
}
func isMismatchedGoroot(s *script.State) (bool, error) {
gorootFinal, _ := s.LookupEnv("GOROOT_FINAL")
if gorootFinal == "" {
gorootFinal, _ = s.LookupEnv("GOROOT")
}
return gorootFinal != testGOROOT, nil
}
func sysCondition(flag string, f func(goos, goarch string) bool, needsCgo bool) script.Cond {
return script.Condition(
"GOOS/GOARCH supports "+flag,
func(s *script.State) (bool, error) {
GOOS, _ := s.LookupEnv("GOOS")
GOARCH, _ := s.LookupEnv("GOARCH")
cross := goHostOS != GOOS || goHostArch != GOARCH
return (!needsCgo || (testenv.HasCGO() && !cross)) && f(GOOS, GOARCH), nil
})
}
func hasBuildmode(s *script.State, mode string) (bool, error) {
GOOS, _ := s.LookupEnv("GOOS")
GOARCH, _ := s.LookupEnv("GOARCH")
return platform.BuildModeSupported(runtime.Compiler, mode, GOOS, GOARCH), nil
}
var scriptNetEnabled sync.Map // testing.TB → already enabled
func hasNet(s *script.State, host string) (bool, error) {
if !testenv.HasExternalNetwork() {
return false, nil
}
// TODO(bcmills): Add a flag or environment variable to allow skipping tests
// for specific hosts and/or skipping all net tests except for specific hosts.
t, ok := tbFromContext(s.Context())
if !ok {
return false, errors.New("script Context unexpectedly missing testing.TB key")
}
if netTestSem != nil {
// When the number of external network connections is limited, we limit the
// number of net tests that can run concurrently so that the overall number
// of network connections won't exceed the limit.
_, dup := scriptNetEnabled.LoadOrStore(t, true)
if !dup {
// Acquire a net token for this test until the test completes.
netTestSem <- struct{}{}
t.Cleanup(func() {
<-netTestSem
scriptNetEnabled.Delete(t)
})
}
}
// Since we have confirmed that the network is available,
// allow cmd/go to use it.
s.Setenv("TESTGONETWORK", "")
return true, nil
}
func hasGodebug(s *script.State, value string) (bool, error) {
godebug, _ := s.LookupEnv("GODEBUG")
for _, p := range strings.Split(godebug, ",") {
if strings.TrimSpace(p) == value {
return true, nil
}
}
return false, nil
}
func hasGoexperiment(s *script.State, value string) (bool, error) {
GOOS, _ := s.LookupEnv("GOOS")
GOARCH, _ := s.LookupEnv("GOARCH")
goexp, _ := s.LookupEnv("GOEXPERIMENT")
flags, err := buildcfg.ParseGOEXPERIMENT(GOOS, GOARCH, goexp)
if err != nil {
return false, err
}
for _, exp := range flags.All() {
if value == exp {
return true, nil
}
if strings.TrimPrefix(value, "no") == strings.TrimPrefix(exp, "no") {
return false, nil
}
}
return false, fmt.Errorf("unrecognized GOEXPERIMENT %q", value)
}
func isCaseSensitive() (bool, error) {
tmpdir, err := os.MkdirTemp(testTmpDir, "case-sensitive")
if err != nil {
return false, fmt.Errorf("failed to create directory to determine case-sensitivity: %w", err)
}
defer os.RemoveAll(tmpdir)
fcap := filepath.Join(tmpdir, "FILE")
if err := os.WriteFile(fcap, []byte{}, 0644); err != nil {
return false, fmt.Errorf("error writing file to determine case-sensitivity: %w", err)
}
flow := filepath.Join(tmpdir, "file")
_, err = os.ReadFile(flow)
switch {
case err == nil:
return false, nil
case os.IsNotExist(err):
return true, nil
default:
return false, fmt.Errorf("unexpected error reading file when determining case-sensitivity: %w", err)
}
}
func isTrimpath() (bool, error) {
info, _ := debug.ReadBuildInfo()
if info == nil {
return false, errors.New("missing build info")
}
for _, s := range info.Settings {
if s.Key == "-trimpath" && s.Value == "true" {
return true, nil
}
}
return false, nil
}
func hasWorkingGit() bool {
if runtime.GOOS == "plan9" {
// The Git command is usually not the real Git on Plan 9.
// See https://golang.org/issues/29640.
return false
}
_, err := exec.LookPath("git")
return err == nil
}
func cgoLinkExt(s *script.State) (bool, error) {
GOOS, _ := s.LookupEnv("GOOS")
GOARCH, _ := s.LookupEnv("GOARCH")
return platform.MustLinkExternal(GOOS, GOARCH, true), nil
}
func mustLinkExt(s *script.State) (bool, error) {
GOOS, _ := s.LookupEnv("GOOS")
GOARCH, _ := s.LookupEnv("GOARCH")
return platform.MustLinkExternal(GOOS, GOARCH, false), nil
}
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