tw := tar.NewWriter(zw)

	// Find the mode and mtime to use for directory entries,
	// based on the mode and mtime of the first file we see.
	// We know that modes and mtimes are uniform across the archive.
	var dirMode fs.FileMode
	var mtime time.Time
	for _, f := range a.Files {
		dirMode = fs.ModeDir | f.Mode | (f.Mode&0444)>>2 // copy r bits down to x bits
		mtime = f.Time
		break
	}

// within 5 days of the previous reuse. See golang.org/issue/22990.
const (
	mtimeInterval = 1 * time.Hour
	trimInterval  = 24 * time.Hour
	trimLimit     = 5 * 24 * time.Hour
)

// used makes a best-effort attempt to update mtime on file,
// so that mtime reflects cache access time.
//
// Because the reflection only needs to be approximate,
// and to reduce the amount of disk activity caused by using

				"mtime": "1350244992.023960108",
				"atime": "1350244992.023960108",
				"ctime": "1350244992.023960108",
			},
			Format: FormatPAX,
		}, {
			Name:       "a/b",
			Mode:       0777,
			Uid:        1000,
			Gid:        1000,
			Uname:      "shane",
			Gname:      "shane",
			Size:       0,
			ModTime:    time.Unix(1350266320, 910238425),
			ChangeTime: time.Unix(1350266320, 910238425),

				PAXRecords: map[string]string{"path": ""}, // Should delete "path", but keep "mtime"
			}, nil},
			testHeader{Header{
				Typeflag: TypeReg, Name: "file3",
			}, nil},
			testHeader{Header{
				Typeflag:   TypeReg,
				Name:       "file4",
				ModTime:    time.Unix(1400000000, 0),
				PAXRecords: map[string]string{"mtime": "1400000000"},
			}, nil},
			testClose{nil},
		},
	}, {

func isfile(p string) bool {
	fi, err := os.Stat(p)
	return err == nil && fi.Mode().IsRegular()
}

// mtime returns the modification time of the file p.
func mtime(p string) time.Time {
	fi, err := os.Stat(p)
	if err != nil {
		return time.Time{}
	}
	return fi.ModTime()
}

// readfile returns the content of the named file.
func readfile(file string) string {

		return cache.ActionID{}, ErrNotIndexed
	}
	cutoff := time.Now().Add(-modTimeCutoff)
	for _, info := range entries {
		if info.IsDir() {
			continue
		}

		if !info.Mode().IsRegular() {
			return cache.ActionID{}, ErrNotIndexed
		}
		// To avoid problems for very recent files where a new
		// write might not change the mtime due to file system
		// mtime precision, reject caching if a file was read that

			symlink(path, link, callback) { callback(enosys()); },
			truncate(path, length, callback) { callback(enosys()); },
			unlink(path, callback) { callback(enosys()); },
			utimes(path, atime, mtime, callback) { callback(enosys()); },
		};
	}

	if (!globalThis.process) {
		globalThis.process = {
			getuid() { return -1; },
			getgid() { return -1; },
			geteuid() { return -1; },

	//
	// To use AccessTime or ChangeTime, specify the Format as PAX or GNU.
	// To use sub-second resolution, specify the Format as PAX.
	ModTime    time.Time // Modification time
	AccessTime time.Time // Access time (requires either PAX or GNU support)
	ChangeTime time.Time // Change time (requires either PAX or GNU support)

	Devmajor int64 // Major device number (valid for TypeChar or TypeBlock)

	{"X1", "X1"},
	{"X2", "X2"},
	{"X3", "X3"},
	{"X4", "X4"},
	{"X5", "X5"},
	{"X6", "X6"},
	{"X7", "X7"},
	{"asmcgocall<>(SB)", "asmcgocall<>(SB)"},
	{"ax+4(FP)", "ax+4(FP)"},
	{"ptime-12(SP)", "ptime-12(SP)"},
	{"runtime·_NtWaitForSingleObject(SB)", "runtime._NtWaitForSingleObject(SB)"},
	{"s(FP)", "s(FP)"},
	{"sec+4(FP)", "sec+4(FP)"},
	{"shifts<>(SB)(CX*8)", "shifts<>(SB)(CX*8)"},
	{"x+4(FP)", "x+4(FP)"},

pkg text/template/parse, const SkipFuncCheck Mode
pkg time, const Layout = "01/02 03:04:05PM '06 -0700"
pkg time, const Layout ideal-string
pkg time, func UnixMicro(int64) Time
pkg time, func UnixMilli(int64) Time
pkg time, method (Time) GoString() string
pkg time, method (Time) IsDST() bool
pkg time, method (Time) UnixMicro() int64