}
		defer unlock()

		if err := downloadZip(ctx, mod, zipfile); err != nil {
			return "", err
		}
		return zipfile, nil
	})
}

func downloadZip(ctx context.Context, mod module.Version, zipfile string) (err error) {
	ctx, span := trace.StartSpan(ctx, "modfetch.downloadZip "+zipfile)
	defer span.Done()

	// Double-check that the zipfile was not created while we were waiting for
	// the lock in DownloadZip.

	// go and gofmt and $GOOS_$GOARCH (target bin when cross-compiling).
	binFiles, err := filepath.Glob(pathf("%s/bin/*", goroot))
	if err != nil {
		fatalf("glob: %v", err)
	}

	ok := map[string]bool{}
	for _, f := range oldBinFiles {
		ok[f] = true
	}
	for _, f := range binFiles {
		if gohostos == "darwin" && filepath.Base(f) == ".DS_Store" {

			return nil, err
		})
}

func scriptModzip() script.Cmd {
	return script.Command(
		script.CmdUsage{
			Summary: "create a Go module zip file from a directory",
			Args:    "zipfile path@version dir",
		},
		func(st *script.State, args ...string) (wait script.WaitFunc, err error) {
			if len(args) != 3 {
				return nil, script.ErrUsage
			}
			zipPath := st.Path(args[0])

		if tt.repo == gitrepo1 {
			for _, tt.repo = range altRepos() {
				t.Run(path.Base(tt.repo)+"/"+tt.rev+"/"+tt.file, runTest(tt))
			}
		}
	}
}

type zipFile struct {
	name string
	size int64
}

func TestReadZip(t *testing.T) {
	t.Parallel()

	type readZipTest struct {
		repo   string
		rev    string
		subdir string
		err    string

			if len(subdirs) > 0 {
				if err := sh.RemoveAll(subdirs...); err != nil && !printedErrors {
					printedErrors = true
					base.Error(err)
				}
			}

			logFile := filepath.Join(dir, "log.txt")
			if err := sh.RemoveAll(logFile); err != nil && !printedErrors {
				printedErrors = true
				base.Error(err)
			}
		}
	}

	if cleanTestcache && !cleanCache {

		t.Skip("skipping: Chmod ignored ModeSetgid on " + runtime.GOOS)
	}

	pkgfile, err := os.CreateTemp("", "pkgfile")
	if err != nil {
		t.Fatalf("os.CreateTemp(\"\", \"pkgfile\"): %v", err)
	}
	defer os.Remove(pkgfile.Name())
	defer pkgfile.Close()

	dirGIDFile := filepath.Join(setgiddir, "setgid")
	if err := sh.moveOrCopyFile(dirGIDFile, pkgfile.Name(), 0666, true); err != nil {
		t.Fatalf("moveOrCopyFile: %v", err)
	}

			for _, m := range mg.BuildList() {
				r := resolveReplacement(m)
				if keepModSumsForZipSums {
					keep[modkey(r)] = true // we need the go version from the go.mod file to do anything useful with the zipfile
				}
				keep[r] = true
			}
		}
	}

	return keep
}

type whichSums int8

const (
	loadedZipSumsOnly = whichSums(iota)
	addBuildListZipSums
)

		"--revision", rev,
		"--", remotePath,
		exportDir,
	})
	release()
	if err != nil {
		return err
	}

	// Scrape the exported files out of the filesystem and encode them in the zipfile.

	// “All files in the zip file are expected to be
	// nested in a single top-level directory, whose name is not specified.”
	// We'll (arbitrarily) choose the base of the remote path.

					f, err := os.CreateTemp(tmpdir, tt.version+".zip.")
					if err != nil {
						t.Fatalf("os.CreateTemp: %v", err)
					}
					zipfile := f.Name()
					defer func() {
						f.Close()
						os.Remove(zipfile)
					}()

					var w io.Writer
					var h hash.Hash
					if needHash {
						h = sha256.New()
						w = io.MultiWriter(f, h)
					} else {
						w = f

	return modzip.Create(dst, module.Version{Path: r.modPath, Version: version}, files)
}

type zipFile struct {
	name string
	f    *zip.File
}

func (f zipFile) Path() string                 { return f.name }
func (f zipFile) Lstat() (fs.FileInfo, error)  { return f.f.FileInfo(), nil }
func (f zipFile) Open() (io.ReadCloser, error) { return f.f.Open() }

type dataFile struct {
	name string