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// Copyright 2015 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 testenv provides information about what functionality
// is available in different testing environments run by the Go team.
//
// It is an internal package because these details are specific
// to the Go team's test setup (on build.golang.org) and not
// fundamental to tests in general.
package testenv
import (
"errors"
"flag"
"os"
"os/exec"
"path/filepath"
"runtime"
"strconv"
"strings"
"testing"
)
// Builder reports the name of the builder running this test
// (for example, "linux-amd64" or "windows-386-gce").
// If the test is not running on the build infrastructure,
// Builder returns the empty string.
func Builder() string {
return os.Getenv("GO_BUILDER_NAME")
}
// HasGoBuild reports whether the current system can build programs with ``go build''
// and then run them with os.StartProcess or exec.Command.
func HasGoBuild() bool {
if os.Getenv("GO_GCFLAGS") != "" {
// It's too much work to require every caller of the go command
// to pass along "-gcflags="+os.Getenv("GO_GCFLAGS").
// For now, if $GO_GCFLAGS is set, report that we simply can't
// run go build.
return false
}
switch runtime.GOOS {
case "android", "nacl":
return false
case "darwin":
if strings.HasPrefix(runtime.GOARCH, "arm") {
return false
}
}
return true
}
// MustHaveGoBuild checks that the current system can build programs with ``go build''
// and then run them with os.StartProcess or exec.Command.
// If not, MustHaveGoBuild calls t.Skip with an explanation.
func MustHaveGoBuild(t testing.TB) {
if os.Getenv("GO_GCFLAGS") != "" {
t.Skipf("skipping test: 'go build' not compatible with setting $GO_GCFLAGS")
}
if !HasGoBuild() {
t.Skipf("skipping test: 'go build' not available on %s/%s", runtime.GOOS, runtime.GOARCH)
}
}
// HasGoRun reports whether the current system can run programs with ``go run.''
func HasGoRun() bool {
// For now, having go run and having go build are the same.
return HasGoBuild()
}
// MustHaveGoRun checks that the current system can run programs with ``go run.''
// If not, MustHaveGoRun calls t.Skip with an explanation.
func MustHaveGoRun(t testing.TB) {
if !HasGoRun() {
t.Skipf("skipping test: 'go run' not available on %s/%s", runtime.GOOS, runtime.GOARCH)
}
}
// GoToolPath reports the path to the Go tool.
// It is a convenience wrapper around GoTool.
// If the tool is unavailable GoToolPath calls t.Skip.
// If the tool should be available and isn't, GoToolPath calls t.Fatal.
func GoToolPath(t testing.TB) string {
MustHaveGoBuild(t)
path, err := GoTool()
if err != nil {
t.Fatal(err)
}
return path
}
// GoTool reports the path to the Go tool.
func GoTool() (string, error) {
if !HasGoBuild() {
return "", errors.New("platform cannot run go tool")
}
var exeSuffix string
if runtime.GOOS == "windows" {
exeSuffix = ".exe"
}
path := filepath.Join(runtime.GOROOT(), "bin", "go"+exeSuffix)
if _, err := os.Stat(path); err == nil {
return path, nil
}
goBin, err := exec.LookPath("go" + exeSuffix)
if err != nil {
return "", errors.New("cannot find go tool: " + err.Error())
}
return goBin, nil
}
// HasExec reports whether the current system can start new processes
// using os.StartProcess or (more commonly) exec.Command.
func HasExec() bool {
switch runtime.GOOS {
case "nacl":
return false
case "darwin":
if strings.HasPrefix(runtime.GOARCH, "arm") {
return false
}
}
return true
}
// HasSrc reports whether the entire source tree is available under GOROOT.
func HasSrc() bool {
switch runtime.GOOS {
case "nacl":
return false
case "darwin":
if strings.HasPrefix(runtime.GOARCH, "arm") {
return false
}
}
return true
}
// MustHaveExec checks that the current system can start new processes
// using os.StartProcess or (more commonly) exec.Command.
// If not, MustHaveExec calls t.Skip with an explanation.
func MustHaveExec(t testing.TB) {
if !HasExec() {
t.Skipf("skipping test: cannot exec subprocess on %s/%s", runtime.GOOS, runtime.GOARCH)
}
}
// HasExternalNetwork reports whether the current system can use
// external (non-localhost) networks.
func HasExternalNetwork() bool {
return !testing.Short()
}
// MustHaveExternalNetwork checks that the current system can use
// external (non-localhost) networks.
// If not, MustHaveExternalNetwork calls t.Skip with an explanation.
func MustHaveExternalNetwork(t testing.TB) {
if testing.Short() {
t.Skipf("skipping test: no external network in -short mode")
}
}
var haveCGO bool
// HasCGO reports whether the current system can use cgo.
func HasCGO() bool {
return haveCGO
}
// MustHaveCGO calls t.Skip if cgo is not available.
func MustHaveCGO(t testing.TB) {
if !haveCGO {
t.Skipf("skipping test: no cgo")
}
}
// HasSymlink reports whether the current system can use os.Symlink.
func HasSymlink() bool {
ok, _ := hasSymlink()
return ok
}
// MustHaveSymlink reports whether the current system can use os.Symlink.
// If not, MustHaveSymlink calls t.Skip with an explanation.
func MustHaveSymlink(t testing.TB) {
ok, reason := hasSymlink()
if !ok {
t.Skipf("skipping test: cannot make symlinks on %s/%s%s", runtime.GOOS, runtime.GOARCH, reason)
}
}
// HasLink reports whether the current system can use os.Link.
func HasLink() bool {
// From Android release M (Marshmallow), hard linking files is blocked
// and an attempt to call link() on a file will return EACCES.
// - https://code.google.com/p/android-developer-preview/issues/detail?id=3150
return runtime.GOOS != "plan9" && runtime.GOOS != "android"
}
// MustHaveLink reports whether the current system can use os.Link.
// If not, MustHaveLink calls t.Skip with an explanation.
func MustHaveLink(t testing.TB) {
if !HasLink() {
t.Skipf("skipping test: hardlinks are not supported on %s/%s", runtime.GOOS, runtime.GOARCH)
}
}
var flaky = flag.Bool("flaky", false, "run known-flaky tests too")
func SkipFlaky(t testing.TB, issue int) {
t.Helper()
if !*flaky {
t.Skipf("skipping known flaky test without the -flaky flag; see golang.org/issue/%d", issue)
}
}
func SkipFlakyNet(t testing.TB) {
t.Helper()
if v, _ := strconv.ParseBool(os.Getenv("GO_BUILDER_FLAKY_NET")); v {
t.Skip("skipping test on builder known to have frequent network failures")
}
}
// CleanCmdEnv will fill cmd.Env with the environment, excluding certain
// variables that could modify the behavior of the Go tools such as
// GODEBUG and GOTRACEBACK.
func CleanCmdEnv(cmd *exec.Cmd) *exec.Cmd {
if cmd.Env != nil {
panic("environment already set")
}
for _, env := range os.Environ() {
// Exclude GODEBUG from the environment to prevent its output
// from breaking tests that are trying to parse other command output.
if strings.HasPrefix(env, "GODEBUG=") {
continue
}
// Exclude GOTRACEBACK for the same reason.
if strings.HasPrefix(env, "GOTRACEBACK=") {
continue
}
cmd.Env = append(cmd.Env, env)
}
return cmd
}
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