[RFC] Add support for apt_preferences(5) files

Hi!

While libglib2.0-udeb in unstable is currently broken due to a dependency problem, the version in testing is fine to work with.

So in order to continue to work on other aspects of d-i, I implemented support for apt_preferences(5) in the build system. It was fairly easy and the patch is quite small. This allow to easily select packages depending on their source.

What do you think?

---
 installer/build/util/get-packages |    3 +++
 installer/build/util/pkg-list     |    1 +
 installer/debian/changelog        |    4 ++++
 3 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/installer/build/util/get-packages b/installer/build/util/get-packages
index b51522d..c8c1637 100755
--- a/installer/build/util/get-packages
+++ b/installer/build/util/get-packages

@@ -8,6 +8,8 @@

 # Files:
 #   sources.list.udeb / sources.list.udeb.local
 #   sources.list.deb  / sources.list.deb.local
+#   preferences.udeb.local
+#   preferences.deb.local
 #
 # Environment:
 #   APTDIR       - basename for the apt directory (default: apt.$TYPE)

@@ -73,6 +75,7 @@ fi

 # everything so it need not run as root.
 APT_GET="apt-get --assume-yes \
 	-o Dir::Etc::sourcelist=`pwd`/$LIST \
+	-o Dir::Etc::Preferences=`pwd`/preferences.$TYPE.local \
 	-o Dir::State=`pwd`/$APTDIR/state \
 	-o Debug::NoLocking=true \
 	-o Dir::Cache=`pwd`/$APTDIR/cache \
diff --git a/installer/build/util/pkg-list b/installer/build/util/pkg-list
index 87ff95c..fe3755c 100755
--- a/installer/build/util/pkg-list
+++ b/installer/build/util/pkg-list

@@ -62,6 +62,7 @@ sub apt_cache {

 	
 	return `LANG=C apt-cache \\
 		-o Dir::Etc::sourcelist=./$sourceslist \\
+		-o Dir::Etc::Preferences=./preferences.udeb.local \\
 		-o Dir::State=./apt.udeb/state \\
 		-o Dir::State::Status=./apt.udeb/state/status \\
 		-o Dir::Cache=./apt.udeb/cache $params 2>/dev/null`;
diff --git a/installer/debian/changelog b/installer/debian/changelog
index 02b0ae1..0d4dabd 100644
--- a/installer/debian/changelog
+++ b/installer/debian/changelog

@@ -134,6 +134,10 @@ debian-installer (2007xxxx) UNRELEASED; urgency=low

 
   [ Joey Hess ]
   * Change f8.txt to document tasksel/desktop.
+  
+  [ Jérémy Bobbio ]
+  * Add support for apt_preferences(5) files (preferences.{deb,udeb}.local) to
+    ease development when packages are broken in unstable.
 
  -- Joey Hess   Fri, 14 Sep 2007 10:01:58 -0400
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Cheers,
-- 
Jérémy Bobbio                        .''`. 
lunar@debian.org                    : :Ⓐ  :  # apt-get install anarchism
                                    `. `'` 
                                      `-   

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