[Bug 1037193] Re: deb package archive should use "lzma -1" or "xz -1e" compression by default

[Dmitrijs Ledkovs]

This is a significant change to the archive, which has a high impact. A
blueprint about this is linked to this bug and it is currently planned
to discuss this at the UDS-R.

** Changed in: dpkg (Ubuntu)
       Status: Confirmed => Opinion

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Title:
  deb package archive should use "lzma -1" or "xz -1e" compression by
  default

Status in dpkg:
  New
Status in “dpkg” package in Ubuntu:
  Opinion

Bug description:
  If I understood, in order to fit any system, the compression method
  has to ensure that the required memory while decompression won't be
  too high. Maybe that's a reason of the choice of gzip compression
  method (in addition to its speed for decompression).

  However, would it be possible to use the "--fast" or "-1" option of
  the lzma or xz compression programs ? With such a low force of those
  compression algorithms, the required memory for decompression is quite
  the same than the memory required by gunzip. However the compression
  ratio becomes better.

  Below are a few details of the comparison :
  ----------------------------------------------------------
  j at j-lt:~/tmp$ 7z x /var/cache/apt/archives/linux-libc-dev_2.6.32-42.95_i386.deb 

  7-Zip 9.04 beta  Copyright (c) 1999-2009 Igor Pavlov  2009-05-30
  p7zip Version 9.04 (locale=fr_FR.UTF-8,Utf16=on,HugeFiles=on,1 CPU)

  Processing archive: /var/cache/apt/archives/linux-libc-
  dev_2.6.32-42.95_i386.deb

  Extracting  control.tar.gz
  Extracting  data.tar.gz

  Everything is Ok

  Files: 2
  Size:       856328
  Compressed: 856520
  j at j-lt:~/tmp$ gunzip -c data.tar.gz > data.tar
  j at j-lt:~/tmp$ gzip -c9 data.tar > data.tar.gz-9
  j at j-lt:~/tmp$ lzma -c1 data.tar > data.tar.lzma-1
  j at j-lt:~/tmp$ xz -c1e data.tar > data.tar.xz-1
  j at j-lt:~/tmp$ ls -lh
  total 6,0M
  -rw-r--r-- 1 j j  18K 2012-07-25 19:36 control.tar.gz
  -rw-r--r-- 1 j j 3,0M 2012-08-15 17:46 data.tar
  -rw-r--r-- 1 j j 820K 2012-07-25 19:36 data.tar.gz
  -rw-r--r-- 1 j j 820K 2012-08-15 17:46 data.tar.gz-9
  -rw-r--r-- 1 j j 765K 2012-08-15 17:47 data.tar.lzma-1
  -rw-r--r-- 1 j j 718K 2012-08-15 17:52 data.tar.xz-1
  j at j-lt:~/tmp$

  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: linux-libc-dev 2.6.32-42.95
  Regression: No
  Reproducible: Yes
  ProcVersionSignature: Ubuntu 2.6.32-41.94-generic 2.6.32.59+drm33.24
  Uname: Linux 2.6.32-41-generic i686
  AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 2: ls: cannot access /dev/snd/: No such file or directory
  AplayDevices: Error: [Errno 2] Aucun fichier ou dossier de ce type
  Architecture: i386
  ArecordDevices: Error: [Errno 2] Aucun fichier ou dossier de ce type
  BootDmesg: (Nothing has been logged yet.)
  Date: Wed Aug 15 18:07:22 2012
  Dependencies:
   
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 001 Device 002: ID 046d:c016 Logitech, Inc. M-UV69a/HP M-UV96 Optical Wheel Mouse
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: Sony Corporation PCG-FX301(FR)
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-41-generic root=UUID=cc325b47-77d9-4b57-98af-0db1393969c6 ro quiet splash
  ProcEnviron:
   LANG=fr_FR.UTF-8
   SHELL=/bin/dash
  SourcePackage: linux
  dmi.bios.date: 07/04/2001
  dmi.bios.vendor: Sony Corporation
  dmi.bios.version: R0104K5
  dmi.board.name: QII-Project
  dmi.board.vendor: Sony Corporation
  dmi.board.version: 1A
  dmi.chassis.asset.tag: 962C8394A050580000000000
  dmi.chassis.type: 10
  dmi.chassis.vendor: Sony Corporation
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnSonyCorporation:bvrR0104K5:bd07/04/2001:svnSonyCorporation:pnPCG-FX301(FR):pvr01:rvnSonyCorporation:rnQII-Project:rvr1A:cvnSonyCorporation:ct10:cvrN/A:
  dmi.product.name: PCG-FX301(FR)
  dmi.product.version: 01
  dmi.sys.vendor: Sony Corporation

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