bug#12455: 24.2; POSIX tar archives with extended header information are parsed incorrectly

[Achim Gratz]

The first file in a tar archive with PAX extended header information is
inaccessible:

  rw-r--r--    1000/100          40 
org-7.9.1-220-g5a122c/PaxHeaders.12938/README
 ----------       0/0             0 20 atime=1347724616
20 ctime=1346955271

 -rw-r--r--   gratz/users      1319 org-7.9.1-220-g5a122c/README
  rw-r--r--    1000/100          40 
org-7.9.1-220-g5a122c/lisp/PaxHeaders.12938/Makefile
 ----------       0/0             0 20 atime=1347724476
20 ctime=1345833266

 -rw-r--r--   gratz/users      2115 org-7.9.1-220-g5a122c/lisp/Makefile

Emacs can't extract README for this archive, but it will be able to
extract Makefile.  Additionally it gives strange error messages
containing newlines when the cursor is positioned in some places in the
first entry and it's PAX header.

Additionally, package manager cannot unpack such archives and fails with
an error message.


In GNU Emacs 24.2.1 (i686-suse-linux-gnu, GTK+ Version 3.4.4)
 of 2012-09-13 on Rainer
Windowing system distributor `The X.Org Foundation', version 11.0.11203000
Configured using:
 `configure '--with-x-toolkit=gtk3' '--with-wide-int' '--with-kerberos'
 '--with-kerberos5' '--without-gpm' 'CFLAGS=-fomit-frame-pointer
 -fmessage-length=0 -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector
 -funwind-tables -fasynchronous-unwind-tables -g -D_GNU_SOURCE
 -std=gnu99 -pipe -Wno-pointer-sign -Wno-unused-variable
 -Wno-unused-label -Wno-unprototyped-calls -fno-optimize-sibling-calls
 -DSYSTEM_PURESIZE_EXTRA=55000 -DSITELOAD_PURESIZE_EXTRA=10000'
 'LDFLAGS=-Wl,-O2 -Wl,--hash-size=65521'
 
'--enable-locallisppath=${datadir}/emacs/${version}/site-lisp:${datadir}/emacs/site-lisp:/usr/share/emacs/site-lisp''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: POSIX
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: C
  value of $LC_TIME: nil
  value of $LANG: de_DE.UTF-8
  value of $XMODIFIERS: @im=local
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Tar

Minor modes in effect:
  yas/global-mode: t
  show-paren-mode: t
  shell-dirtrack-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t


Regards,
Achim.
-- 
+<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk Blofeld]>+

Samples for the Waldorf Blofeld:
http://Synth.Stromeko.net/Downloads.html#BlofeldSamplesExtra