}
	}

	cfg.BuildMod = "readonly"
}

func modulesTextIsForWorkspace(vendorDir string) (bool, error) {
	f, err := fsys.Open(filepath.Join(vendorDir, "modules.txt"))
	if errors.Is(err, os.ErrNotExist) {
		// Some vendor directories exist that don't contain modules.txt.
		// This mostly happens when converting to modules.
		// We want to preserve the behavior that mod=vendor is set (even though

	}

	if cleanUp {
		bgFormatErasureCleanupTmp(s.drivePath) // cleanup any old data.
	}

	formatData, formatFi, err := formatErasureMigrate(s.drivePath)
	if err != nil && !errors.Is(err, os.ErrNotExist) {
		if os.IsPermission(err) {
			return s, errDiskAccessDenied
		} else if isSysErrIO(err) {
			return s, errFaultyDisk
		}
		return s, err
	}
	s.formatData = formatData

			// (so the bootstrap toolchain packages don't even appear to be in GOROOT).
			goto omitVCS
		}
		repoDir, vcsCmd, err = vcs.FromDir(base.Cwd(), "", allowNesting)
		if err != nil && !errors.Is(err, os.ErrNotExist) {
			setVCSError(err)
			return
		}
		if !str.HasFilePathPrefix(p.Module.Dir, repoDir) &&
			!str.HasFilePathPrefix(repoDir, p.Module.Dir) {

		t.Fatal(err)
	}
	defer res.Body.Close()
	fname, err := io.ReadAll(res.Body)
	if err != nil {
		t.Fatal(err)
	}
	cst.close()
	if _, err := os.Stat(string(fname)); !errors.Is(err, os.ErrNotExist) {
		t.Errorf("file %q exists after HTTP handler returned", string(fname))
	}
}

func TestHeadBody(t *testing.T) {
	const identityMode = false
	const chunkedMode = true

		{"(FileMode).String", Method, 16},
		{"(FileMode).Type", Method, 16},
		{"DirEntry", Type, 16},
		{"ErrClosed", Var, 16},
		{"ErrExist", Var, 16},
		{"ErrInvalid", Var, 16},
		{"ErrNotExist", Var, 16},
		{"ErrPermission", Var, 16},
		{"FS", Type, 16},
		{"File", Type, 16},
		{"FileInfo", Type, 16},
		{"FileInfoToDirEntry", Func, 17},
		{"FileMode", Type, 16},

pkg io/fs, type WalkDirFunc func(string, DirEntry, error) error
pkg io/fs, var ErrClosed error
pkg io/fs, var ErrExist error
pkg io/fs, var ErrInvalid error
pkg io/fs, var ErrNotExist error
pkg io/fs, var ErrPermission error
pkg io/fs, var SkipDir error
pkg log, func Default() *Logger
pkg net, var ErrClosed error
pkg net/http, func FS(fs.FS) FileSystem

pkg os, type SyscallError struct, Err error
pkg os, type SyscallError struct, Syscall string
pkg os, var Args []string
pkg os, var ErrExist error
pkg os, var ErrInvalid error
pkg os, var ErrNotExist error
pkg os, var ErrPermission error
pkg os, var Interrupt Signal
pkg os, var Kill Signal
pkg os, var Stderr *File
pkg os, var Stdin *File
pkg os, var Stdout *File