groupPool.Put(gs)
	}
	s.prefix.Free()
}

func (s *handleState) openGroups() {
	for _, n := range s.h.groups[s.h.nOpenGroups:] {
		s.openGroup(n)
	}
}

// Separator for group names and keys.
const keyComponentSep = '.'

// openGroup starts a new group of attributes
// with the given name.
func (s *handleState) openGroup(name string) {
	if s.h.json {
		s.appendKey(name)
		s.buf.WriteByte('{')

	// Most notably, it cannot support sparse files, files larger than 8GiB,
	// filenames larger than 256 characters, and non-ASCII filenames.
	//
	// Reference:
	//	http://pubs.opengroup.org/onlinepubs/9699919799/utilities/pax.html#tag_20_92_13_06
	FormatUSTAR

	// FormatPAX represents the PAX header format defined in POSIX.1-2001.
	//
	// PAX extends USTAR by writing a special file with Typeflag TypeXHeader

	// blocking SIGTTOU signals or the process is ignoring SIGTTOU
	// signals, the process shall be allowed to perform the
	// operation, and no signal is sent."
	//  -https://pubs.opengroup.org/onlinepubs/9699919799/functions/tcsetpgrp.html
	//
	// We are changing the terminal to put us in the foreground, so
	// we must ignore SIGTTOU. We are also an orphaned process

	// The tzdata information can be followed by a string that describes
	// how to handle DST transitions not recorded in zoneTrans.
	// The format is the TZ environment variable without a colon; see
	// https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap08.html.
	// Example string, for America/Los_Angeles: PST8PDT,M3.2.0,M11.1.0
	extend string

	// Most lookups will be for the current time.

// sysStat, if non-nil, populates h from system-dependent fields of fi.
var sysStat func(fi fs.FileInfo, h *Header, doNameLookups bool) error

const (
	// Mode constants from the USTAR spec:
	// See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/pax.html#tag_20_92_13_06
	c_ISUID = 04000 // Set uid
	c_ISGID = 02000 // Set gid
	c_ISVTX = 01000 // Save text (sticky bit)

		t.Fatal(err)
	}

	linklink := filepath.Join(td, "linklink")
	if err := os.Symlink("link", linklink); err != nil {
		t.Fatal(err)
	}

	// Per https://pubs.opengroup.org/onlinepubs/9699919799.2013edition/basedefs/V1_chap04.html#tag_04_12:
	// “A pathname that contains at least one non- <slash> character and that ends
	// with one or more trailing <slash> characters shall not be resolved