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.

[Eli Zaretskii]

Date: Sun, 16 Sep 2012 08:28:54 +0200
The first file in a tar archive with PAX extended header information is
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.

Isn't this related to bug#258?

In any case, please attach a small file that could be used to
reproduce the problem. Thanks.

[Achim Gratz]

Post by Eli Zaretskii
In any case, please attach a small file that could be used to
reproduce the problem. Thanks.

If you insist
 :-)

[Eli Zaretskii]

Date: Sun, 16 Sep 2012 08:59:00 +0200
=20

Post by Eli Zaretskii
In any case, please attach a small file that could be used to
reproduce the problem. Thanks.

=20
If you insist=E2=80=A6 :-)

Thanks. It looks like this problem was already fixed by Andreas
Schwab, in trunk revision 109582, because I see no problem with the
current trunk. Could you try with the latest trunk, please?

[Achim Gratz]

Post by Eli Zaretskii
Thanks. It looks like this problem was already fixed by Andreas
Schwab, in trunk revision 109582, because I see no problem with the
current trunk. Could you try with the latest trunk, please?

Confirmed. Tar-mode still shows the PAX headers interspersed with the
files which is not very usefule, IMHO — but that's not this bug.


Regards,
Achim.

[Andreas Schwab]

Fixed for emacs 24.3.

Andreas.