Bug#569917: Support base.tar.xz/bz2 as well as tgz

Package: pbuilder
Version: 0.203
Followup-For: Bug #569917

I cooked a little patch that adds a --compressprog command line option and
COMPRESSPROG option in pbuilderrc.

Tested with pigz, to get multithreaded, and therefore much faster
compression/decompression, and xz.

Debian Release: wheezy/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 3.1.0-00002-g5eeb7f9 (SMP w/4 CPU cores)
Locale: LANG=C, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages pbuilder depends on:
ii  cdebootstrap           0.5.8+b1
ii  coreutils              8.13-3
ii  debconf [debconf-2.0]  1.5.41
ii  debianutils            4.0.4
ii  debootstrap            1.0.38
ii  wget                   1.13.4-1

Versions of packages pbuilder recommends:
ii  devscripts  2.11.2
ii  fakeroot    1.18.1-1
ii  sudo        1.8.3p1-2

Versions of packages pbuilder suggests:
pn  cowdancer     0.65
pn  gdebi-core    <none>
pn  pbuilder-uml  <none>

-- debconf information:
  pbuilder/mirrorsite: http://ftp.de.debian.org/debian/
  pbuilder/nomirror:
  pbuilder/rewrite: false

1 files changed, 8 insertions, 0 deletions

diff --git a/pbuilderrc.5 b/pbuilderrc.5
index 301b007..14fde73 100644
--- a/pbuilderrc.5
+++ b/pbuilderrc.5
@@ -153,6 +153,14 @@ is specified for
 .B "pbuilder update"
 option.
 .TP
+.BI "COMPRESSPROG=" "gzip"
+Program to use for compression and decompression of the base.tgz.
+The default is to use gzip, and any program that can be used for
+the --use-compress-program option of tar can be given.
+
+If set to "pigz", compression and decompression is gzip compatible
+but will use all available CPUs.
+.TP
 .BI "export http_proxy=" "http://your-proxy:8080/"
 Defines the proxy for http connection.
 .TP