GNU bug report logs - #2353
23.0.90; jka-compr: LZMA support

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Message #5 received at submit <at> emacsbugs.donarmstrong.com (full text, mbox):

From: trentbuck <at> gmail.com
To: emacs-pretest-bug <at> gnu.org
Cc: rfrancoise <at> debian.org
Subject: 23.0.90; jka-compr: LZMA support
Date: Mon, 16 Feb 2009 22:36:49 -0800 (PST)

From lzma(1):

    LZMA (Lempel-Ziv-Markov chain-Algorithm) is an improved version of
    famous LZ77 compression algorithm. It was improved in way of
    maximum increasing of compression ratio, keeping high
    decompression speed and low memory requirements for decompressing.

This seems to work such that foo.tar.lzma can be opened happily by
Emacs.  I suggest adding it to the default list in jka-compr.el.

    (progn
      (add-to-list 'jka-compr-compression-info-list
        ["\\.lzma\\(~\\|\\.~[0-9]+~\\)?\\'" nil "lzma"  nil nil "unlzma" nil nil t ""])
      (jka-compr-set 'jka-compr-compression-info-list jka-compr-compression-info-list))

PS: I'm not sure whether to use nil or "" for this case: there is no
reliable magic for lzma files.  From my /usr/share/file/magic:

    # URL:  http://www.7-zip.org/sdk.html
    # From: Robert Millan <rmh <at> aybabtu.com> and Reuben Thomas <rrt <at> sc3d.org>
    # Commented out because apparently not reliable (according to Debian
    # bug #364260)
    #0      string          ]\000\000\200\000       LZMA compressed data


In GNU Emacs 23.0.90.1 (i486-pc-linux-gnu, GTK+ Version 2.12.11)
 of 2009-02-07 on elegiac, modified by Debian
 (emacs-snapshot package, version 1:20090207-1)
configured using `configure  '--build' 'i486-linux-gnu' '--host' 'i486-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib' '--localstatedir=/var' '--infodir=/usr/share/info' '--mandir=/usr/share/man' '--with-pop=yes' '--enable-locallisppath=/etc/emacs-snapshot:/etc/emacs:/usr/local/share/emacs/23.0.90/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/23.0.90/site-lisp:/usr/share/emacs/site-lisp' '--with-x=yes' '--with-x-toolkit=gtk' 'build_alias=i486-linux-gnu' 'host_alias=i486-linux-gnu' 'CFLAGS=-DDEBIAN -DSITELOAD_PURESIZE_EXTRA=5000 -g -O2' 'LDFLAGS=-g -Wl,--as-needed' 'CPPFLAGS=''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: C
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_AU.utf8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default-enable-multibyte-characters: t

Major mode: Emacs-Lisp

Minor modes in effect:
  diff-auto-refine-mode: t
  eldoc-mode: t
  paredit-mode: t
  shell-dirtrack-mode: t
  rcirc-track-minor-mode: t
  savehist-mode: t
  icomplete-mode: t
  partial-completion-mode: t
  show-paren-mode: t
  delete-selection-mode: t
  tooltip-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
ESC x i r c C-j ESC x g n u s RET q y C-c C-@ C-c C-l 
ESC o ESC a C-c C-@ C-c C-@ C-c C-@ C-c C-@ C-c C-@ 
C-c C-@ C-x C-f ~ / V C S / C-j C-h C-s ESC O B ESC 
O B ESC > C-x C-f ~ / . e m a c s RET ESC O A ESC O 
A ESC [ 1 ~ ESC O A C-@ ESC O B ESC O B ESC O B ESC 
O B ESC w ESC x r e p o r t SPC e m a c s RET

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Message #12 received at 2353 <at> emacsbugs.donarmstrong.com (full text, mbox):

From: James Cloos <cloos <at> jhcloos.com>
To: 2353 <at> debbugs.gnu.org
Subject: Re: bug#2353: 23.0.90; jka-compr: LZMA support
Date: Wed, 04 Mar 2009 13:26:53 -0500

When doing this, xz (lzma's replacement) should be added, too.

The typical extension is .xz and the commands are xz to compress,
unxz to decompress, and xzdec to to decompress to stdout.

Unlike lzma, xz does have reliable file magic; AFAIK, though, it
has not yet been translated into magic(5) format.

-JimC
-- 
James Cloos <cloos <at> jhcloos.com>         OpenPGP: 1024D/ED7DAEA6

Message #17 received at 2353-done <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: 2353-done <at> debbugs.gnu.org
Subject: Re: bug#2353: 23.0.90; jka-compr: LZMA support
Date: Thu, 09 Feb 2012 16:23:22 -0500

Version: 24.1

I noticed that jka-compr-compression-info-list now has entries
for lzma (since end Jan) and xz.

Message #20 received at 2353 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Glenn Morris <rgm <at> gnu.org>
Cc: rgm <at> gnu.org, 2353 <at> debbugs.gnu.org
Subject: Re: bug#2353: 23.0.90; jka-compr: LZMA support
Date: Fri, 10 Feb 2012 00:13:05 +0200

> From: Glenn Morris <rgm <at> gnu.org>
> Date: Thu, 09 Feb 2012 16:23:22 -0500
> 
> Version: 24.1
> 
> I noticed that jka-compr-compression-info-list now has entries
> for lzma (since end Jan) and xz.

Yes, I added them (after I saw several GNU packages started using
these formats exclusively, and more are considering that).

I think we can close that bug.

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