[Bug 986786] [NEW] deb archive should use lzma compression

[Jérôme]

Public bug reported:

Anyway, the software center requires a lot of memory.

Up to 3% of archive size could be saved :
--------------------------------------
j at dt-X64:~/tmp$ 7z x /var/cache/apt/archives/app-install-data_0.12.04.4_all.deb 

7-Zip [64] 9.20  Copyright (c) 1999-2010 Igor Pavlov  2010-11-18
p7zip Version 9.20 (locale=fr_FR.UTF-8,Utf16=on,HugeFiles=on,1 CPU)

Processing archive: /var/cache/apt/archives/app-install-
data_0.12.04.4_all.deb

Extracting  data.tar

Everything is Ok

Size:       11714560
Compressed: 7176706
j at dt-X64:~/tmp$ ls
data.tar
j at dt-X64:~/tmp$ gzip --best --stdout data.tar > data.tar.gz
j at dt-X64:~/tmp$ bzip2 --best --stdout data.tar > data.tar.bz2
j at dt-X64:~/tmp$ lzma --best --stdout data.tar > data.tar.lzma
j at dt-X64:~/tmp$ xz -9e --stdout data.tar > data.tar.xz
j at dt-X64:~/tmp$ ll -h
total 38M
drwxr-xr-x  2 j j 4,0K avril 21 09:31 ./
drwxr-xr-x 23 j j 4,0K avril 21 09:27 ../
-rw-rw-r--  1 j j  12M avril 17 13:03 data.tar
-rw-rw-r--  1 j j 6,7M avril 21 09:30 data.tar.bz2
-rw-rw-r--  1 j j 6,7M avril 21 09:30 data.tar.gz
-rw-rw-r--  1 j j 6,6M avril 21 09:30 data.tar.lzma
-rw-rw-r--  1 j j 6,5M avril 21 09:31 data.tar.xz
j at dt-X64:~/tmp$
--------------------------------------

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: app-install-data 0.12.04.4
ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
Uname: Linux 3.2.0-23-generic x86_64
ApportVersion: 2.0.1-0ubuntu5
Architecture: amd64
Date: Sun Apr 22 10:13:43 2012
Dependencies:
 
InstallationMedia: Xubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120328)
PackageArchitecture: all
SourcePackage: app-install-data-ubuntu
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: app-install-data-ubuntu (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug precise

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https://bugs.launchpad.net/bugs/986786

Title:
  deb archive should use lzma compression

Status in “app-install-data-ubuntu” package in Ubuntu:
  New

Bug description:
  Anyway, the software center requires a lot of memory.

  Up to 3% of archive size could be saved :
  --------------------------------------
  j at dt-X64:~/tmp$ 7z x /var/cache/apt/archives/app-install-data_0.12.04.4_all.deb 

  7-Zip [64] 9.20  Copyright (c) 1999-2010 Igor Pavlov  2010-11-18
  p7zip Version 9.20 (locale=fr_FR.UTF-8,Utf16=on,HugeFiles=on,1 CPU)

  Processing archive: /var/cache/apt/archives/app-install-
  data_0.12.04.4_all.deb

  Extracting  data.tar

  Everything is Ok

  Size:       11714560
  Compressed: 7176706
  j at dt-X64:~/tmp$ ls
  data.tar
  j at dt-X64:~/tmp$ gzip --best --stdout data.tar > data.tar.gz
  j at dt-X64:~/tmp$ bzip2 --best --stdout data.tar > data.tar.bz2
  j at dt-X64:~/tmp$ lzma --best --stdout data.tar > data.tar.lzma
  j at dt-X64:~/tmp$ xz -9e --stdout data.tar > data.tar.xz
  j at dt-X64:~/tmp$ ll -h
  total 38M
  drwxr-xr-x  2 j j 4,0K avril 21 09:31 ./
  drwxr-xr-x 23 j j 4,0K avril 21 09:27 ../
  -rw-rw-r--  1 j j  12M avril 17 13:03 data.tar
  -rw-rw-r--  1 j j 6,7M avril 21 09:30 data.tar.bz2
  -rw-rw-r--  1 j j 6,7M avril 21 09:30 data.tar.gz
  -rw-rw-r--  1 j j 6,6M avril 21 09:30 data.tar.lzma
  -rw-rw-r--  1 j j 6,5M avril 21 09:31 data.tar.xz
  j at dt-X64:~/tmp$
  --------------------------------------

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: app-install-data 0.12.04.4
  ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
  Uname: Linux 3.2.0-23-generic x86_64
  ApportVersion: 2.0.1-0ubuntu5
  Architecture: amd64
  Date: Sun Apr 22 10:13:43 2012
  Dependencies:
   
  InstallationMedia: Xubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120328)
  PackageArchitecture: all
  SourcePackage: app-install-data-ubuntu
  UpgradeStatus: No upgrade log present (probably fresh install)

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