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// Copyright 2019 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 contains helper functions for skipping tests
// based on which tools are present in the environment.
package testenv
import (
"bytes"
"fmt"
"go/build"
"io/ioutil"
"os"
"os/exec"
"runtime"
"strings"
"sync"
)
// Testing is an abstraction of a *testing.T.
type Testing interface {
Skipf(format string, args ...interface{})
Fatalf(format string, args ...interface{})
}
type helperer interface {
Helper()
}
// packageMainIsDevel reports whether the module containing package main
// is a development version (if module information is available).
//
// Builds in GOPATH mode and builds that lack module information are assumed to
// be development versions.
var packageMainIsDevel = func() bool { return true }
var checkGoGoroot struct {
once sync.Once
err error
}
func hasTool(tool string) error {
if tool == "cgo" {
enabled, err := cgoEnabled(false)
if err != nil {
return fmt.Errorf("checking cgo: %v", err)
}
if !enabled {
return fmt.Errorf("cgo not enabled")
}
return nil
}
_, err := exec.LookPath(tool)
if err != nil {
return err
}
switch tool {
case "patch":
// check that the patch tools supports the -o argument
temp, err := ioutil.TempFile("", "patch-test")
if err != nil {
return err
}
temp.Close()
defer os.Remove(temp.Name())
cmd := exec.Command(tool, "-o", temp.Name())
if err := cmd.Run(); err != nil {
return err
}
case "go":
checkGoGoroot.once.Do(func() {
// Ensure that the 'go' command found by exec.LookPath is from the correct
// GOROOT. Otherwise, 'some/path/go test ./...' will test against some
// version of the 'go' binary other than 'some/path/go', which is almost
// certainly not what the user intended.
out, err := exec.Command(tool, "env", "GOROOT").CombinedOutput()
if err != nil {
checkGoGoroot.err = err
return
}
GOROOT := strings.TrimSpace(string(out))
if GOROOT != runtime.GOROOT() {
checkGoGoroot.err = fmt.Errorf("'go env GOROOT' does not match runtime.GOROOT:\n\tgo env: %s\n\tGOROOT: %s", GOROOT, runtime.GOROOT())
}
})
if checkGoGoroot.err != nil {
return checkGoGoroot.err
}
case "diff":
// Check that diff is the GNU version, needed for the -u argument and
// to report missing newlines at the end of files.
out, err := exec.Command(tool, "-version").Output()
if err != nil {
return err
}
if !bytes.Contains(out, []byte("GNU diffutils")) {
return fmt.Errorf("diff is not the GNU version")
}
}
return nil
}
func cgoEnabled(bypassEnvironment bool) (bool, error) {
cmd := exec.Command("go", "env", "CGO_ENABLED")
if bypassEnvironment {
cmd.Env = append(append([]string(nil), os.Environ()...), "CGO_ENABLED=")
}
out, err := cmd.CombinedOutput()
if err != nil {
return false, err
}
enabled := strings.TrimSpace(string(out))
return enabled == "1", nil
}
func allowMissingTool(tool string) bool {
if runtime.GOOS == "android" {
// Android builds generally run tests on a separate machine from the build,
// so don't expect any external tools to be available.
return true
}
switch tool {
case "cgo":
if strings.HasSuffix(os.Getenv("GO_BUILDER_NAME"), "-nocgo") {
// Explicitly disabled on -nocgo builders.
return true
}
if enabled, err := cgoEnabled(true); err == nil && !enabled {
// No platform support.
return true
}
case "go":
if os.Getenv("GO_BUILDER_NAME") == "illumos-amd64-joyent" {
// Work around a misconfigured builder (see https://golang.org/issue/33950).
return true
}
case "diff":
if os.Getenv("GO_BUILDER_NAME") != "" {
return true
}
case "patch":
if os.Getenv("GO_BUILDER_NAME") != "" {
return true
}
}
// If a developer is actively working on this test, we expect them to have all
// of its dependencies installed. However, if it's just a dependency of some
// other module (for example, being run via 'go test all'), we should be more
// tolerant of unusual environments.
return !packageMainIsDevel()
}
// NeedsTool skips t if the named tool is not present in the path.
// As a special case, "cgo" means "go" is present and can compile cgo programs.
func NeedsTool(t Testing, tool string) {
if t, ok := t.(helperer); ok {
t.Helper()
}
err := hasTool(tool)
if err == nil {
return
}
if allowMissingTool(tool) {
t.Skipf("skipping because %s tool not available: %v", tool, err)
} else {
t.Fatalf("%s tool not available: %v", tool, err)
}
}
// NeedsGoPackages skips t if the go/packages driver (or 'go' tool) implied by
// the current process environment is not present in the path.
func NeedsGoPackages(t Testing) {
if t, ok := t.(helperer); ok {
t.Helper()
}
tool := os.Getenv("GOPACKAGESDRIVER")
switch tool {
case "off":
// "off" forces go/packages to use the go command.
tool = "go"
case "":
if _, err := exec.LookPath("gopackagesdriver"); err == nil {
tool = "gopackagesdriver"
} else {
tool = "go"
}
}
NeedsTool(t, tool)
}
// NeedsGoPackagesEnv skips t if the go/packages driver (or 'go' tool) implied
// by env is not present in the path.
func NeedsGoPackagesEnv(t Testing, env []string) {
if t, ok := t.(helperer); ok {
t.Helper()
}
for _, v := range env {
if strings.HasPrefix(v, "GOPACKAGESDRIVER=") {
tool := strings.TrimPrefix(v, "GOPACKAGESDRIVER=")
if tool == "off" {
NeedsTool(t, "go")
} else {
NeedsTool(t, tool)
}
return
}
}
NeedsGoPackages(t)
}
// NeedsGoBuild skips t if the current system can't build programs with ``go build''
// and then run them with os.StartProcess or exec.Command.
// android, and darwin/arm systems don't have the userspace go build needs to run,
// and js/wasm doesn't support running subprocesses.
func NeedsGoBuild(t Testing) {
if t, ok := t.(helperer); ok {
t.Helper()
}
NeedsTool(t, "go")
switch runtime.GOOS {
case "android", "js":
t.Skipf("skipping test: %v can't build and run Go binaries", runtime.GOOS)
case "darwin":
if strings.HasPrefix(runtime.GOARCH, "arm") {
t.Skipf("skipping test: darwin/arm can't build and run Go binaries")
}
}
}
// ExitIfSmallMachine emits a helpful diagnostic and calls os.Exit(0) if the
// current machine is a builder known to have scarce resources.
//
// It should be called from within a TestMain function.
func ExitIfSmallMachine() {
switch os.Getenv("GO_BUILDER_NAME") {
case "linux-arm":
fmt.Fprintln(os.Stderr, "skipping test: linux-arm builder lacks sufficient memory (https://golang.org/issue/32834)")
os.Exit(0)
case "plan9-arm":
fmt.Fprintln(os.Stderr, "skipping test: plan9-arm builder lacks sufficient memory (https://golang.org/issue/38772)")
os.Exit(0)
}
}
// Go1Point returns the x in Go 1.x.
func Go1Point() int {
for i := len(build.Default.ReleaseTags) - 1; i >= 0; i-- {
var version int
if _, err := fmt.Sscanf(build.Default.ReleaseTags[i], "go1.%d", &version); err != nil {
continue
}
return version
}
panic("bad release tags")
}
// NeedsGo1Point skips t if the Go version used to run the test is older than
// 1.x.
func NeedsGo1Point(t Testing, x int) {
if t, ok := t.(helperer); ok {
t.Helper()
}
if Go1Point() < x {
t.Skipf("running Go version %q is version 1.%d, older than required 1.%d", runtime.Version(), Go1Point(), x)
}
}
// SkipAfterGo1Point skips t if the Go version used to run the test is newer than
// 1.x.
func SkipAfterGo1Point(t Testing, x int) {
if t, ok := t.(helperer); ok {
t.Helper()
}
if Go1Point() > x {
t.Skipf("running Go version %q is version 1.%d, newer than maximum 1.%d", runtime.Version(), Go1Point(), x)
}
}