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// Copyright 2023 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
import (
"archive/zip"
"bytes"
"fmt"
"io/fs"
"os"
"os/exec"
"path/filepath"
"runtime"
"strings"
"testing"
"golang.org/x/tools/internal/diffp"
"golang.org/x/tools/internal/testenv"
"golang.org/x/tools/txtar"
)
func init() {
if os.Getenv("TestGonewMain") == "1" {
main()
os.Exit(0)
}
}
func Test(t *testing.T) {
if !testenv.HasExec() {
t.Skipf("skipping test: exec not supported on %s/%s", runtime.GOOS, runtime.GOARCH)
}
exe, err := os.Executable()
if err != nil {
t.Fatal(err)
}
// Each file in testdata is a txtar file with the command to run,
// the contents of modules to initialize in a fake proxy,
// the expected stdout and stderr, and the expected file contents.
files, err := filepath.Glob("testdata/*.txt")
if err != nil {
t.Fatal(err)
}
if len(files) == 0 {
t.Fatal("no test cases")
}
for _, file := range files {
t.Run(filepath.Base(file), func(t *testing.T) {
data, err := os.ReadFile(file)
if err != nil {
t.Fatal(err)
}
ar := txtar.Parse(data)
// If the command begins with ! it means it should fail.
// After the optional ! the first argument must be 'gonew'
// followed by the arguments to gonew.
args := strings.Fields(string(ar.Comment))
wantFail := false
if len(args) > 0 && args[0] == "!" {
wantFail = true
args = args[1:]
}
if len(args) == 0 || args[0] != "gonew" {
t.Fatalf("invalid command comment")
}
// Collect modules into proxy tree and store in temp directory.
dir := t.TempDir()
proxyDir := filepath.Join(dir, "proxy")
writeProxyFiles(t, proxyDir, ar)
extra := ""
if runtime.GOOS == "windows" {
// Windows absolute paths don't start with / so we need one more.
extra = "/"
}
proxyURL := "file://" + extra + filepath.ToSlash(proxyDir)
// Run gonew in a fresh 'out' directory.
out := filepath.Join(dir, "out")
if err := os.Mkdir(out, 0777); err != nil {
t.Fatal(err)
}
cmd := exec.Command(exe, args[1:]...)
cmd.Dir = out
cmd.Env = append(os.Environ(), "TestGonewMain=1", "GOPROXY="+proxyURL, "GOSUMDB=off", "GO111MODULE=auto")
var stdout bytes.Buffer
var stderr bytes.Buffer
cmd.Stdout = &stdout
cmd.Stderr = &stderr
if err := cmd.Run(); err == nil && wantFail {
t.Errorf("unexpected success exit")
} else if err != nil && !wantFail {
t.Errorf("unexpected failure exit")
}
// Collect the expected output from the txtar.
want := make(map[string]txtar.File)
for _, f := range ar.Files {
if f.Name == "stdout" || f.Name == "stderr" || strings.HasPrefix(f.Name, "out/") {
want[f.Name] = f
}
}
// Check stdout and stderr.
// Change \ to / so Windows output looks like Unix output.
stdoutBuf := bytes.ReplaceAll(stdout.Bytes(), []byte(`\`), []byte("/"))
stderrBuf := bytes.ReplaceAll(stderr.Bytes(), []byte(`\`), []byte("/"))
// Note that stdout and stderr can be omitted from the archive if empty.
if !bytes.Equal(stdoutBuf, want["stdout"].Data) {
t.Errorf("wrong stdout: %s", diffp.Diff("want", want["stdout"].Data, "have", stdoutBuf))
}
if !bytes.Equal(stderrBuf, want["stderr"].Data) {
t.Errorf("wrong stderr: %s", diffp.Diff("want", want["stderr"].Data, "have", stderrBuf))
}
delete(want, "stdout")
delete(want, "stderr")
// Check remaining expected outputs.
err = filepath.WalkDir(out, func(name string, info fs.DirEntry, err error) error {
if err != nil {
return err
}
if info.IsDir() {
return nil
}
data, err := os.ReadFile(name)
if err != nil {
return err
}
short := "out" + filepath.ToSlash(strings.TrimPrefix(name, out))
f, ok := want[short]
if !ok {
t.Errorf("unexpected file %s:\n%s", short, data)
return nil
}
delete(want, short)
if !bytes.Equal(data, f.Data) {
t.Errorf("wrong %s: %s", short, diffp.Diff("want", f.Data, "have", data))
}
return nil
})
if err != nil {
t.Fatal(err)
}
for name := range want {
t.Errorf("missing file %s", name)
}
})
}
}
// A Zip is a zip file being written.
type Zip struct {
buf bytes.Buffer
w *zip.Writer
}
// writeProxyFiles collects all the module content from ar and writes
// files in the format of the proxy URL space, so that the 'proxy' directory
// can be used in a GOPROXY=file:/// URL.
func writeProxyFiles(t *testing.T, proxy string, ar *txtar.Archive) {
zips := make(map[string]*Zip)
others := make(map[string]string)
for _, f := range ar.Files {
i := strings.Index(f.Name, "@")
if i < 0 {
continue
}
j := strings.Index(f.Name[i:], "/")
if j < 0 {
t.Fatalf("unexpected archive file %s", f.Name)
}
j += i
mod, vers, file := f.Name[:i], f.Name[i+1:j], f.Name[j+1:]
zipName := mod + "/@v/" + vers + ".zip"
z := zips[zipName]
if z == nil {
others[mod+"/@v/list"] += vers + "\n"
others[mod+"/@v/"+vers+".info"] = fmt.Sprintf("{%q: %q}\n", "Version", vers)
z = new(Zip)
z.w = zip.NewWriter(&z.buf)
zips[zipName] = z
}
if file == "go.mod" {
others[mod+"/@v/"+vers+".mod"] = string(f.Data)
}
w, err := z.w.Create(f.Name)
if err != nil {
t.Fatal(err)
}
if _, err := w.Write(f.Data); err != nil {
t.Fatal(err)
}
}
for name, z := range zips {
if err := z.w.Close(); err != nil {
t.Fatal(err)
}
if err := os.MkdirAll(filepath.Dir(filepath.Join(proxy, name)), 0777); err != nil {
t.Fatal(err)
}
if err := os.WriteFile(filepath.Join(proxy, name), z.buf.Bytes(), 0666); err != nil {
t.Fatal(err)
}
}
for name, data := range others {
// zip loop already created directory
if err := os.WriteFile(filepath.Join(proxy, name), []byte(data), 0666); err != nil {
t.Fatal(err)
}
}
}
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