<link>http://people.skolelinux.org/pere/blog/</link>
<atom:link href="http://people.skolelinux.org/pere/blog/index.rss" rel="self" type="application/rss+xml" />
+ <item>
+ <title>Circular package dependencies harms apt recovery</title>
+ <link>http://people.skolelinux.org/pere/blog/Circular_package_dependencies_harms_apt_recovery.html</link>
+ <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Circular_package_dependencies_harms_apt_recovery.html</guid>
+ <pubDate>Tue, 27 Jul 2010 23:50:00 +0200</pubDate>
+ <description>
+<p>I discovered this while doing
+<a href="http://people.skolelinux.org/pere/blog/Automatic_upgrade_testing_from_Lenny_to_Squeeze.html">automated
+testing of upgrades from Debian Lenny to Squeeze</a>. A few packages
+in Debian still got circular dependencies, and it is often claimed
+that apt and aptitude should be able to handle this just fine, but
+some times these dependency loops causes apt to fail.</p>
+
+<p>An example is from todays
+<a href="http://people.skolelinux.org/~pere/debian-upgrade-testing//test-20100727-lenny-squeeze-kde-aptitude.txt">upgrade
+of KDE using aptitude</a>. In it, a bug in kdebase-workspace-data
+causes perl-modules to fail to upgrade. The cause is simple. If a
+package fail to unpack, then only part of packages with the circular
+dependency might end up being unpacked when unpacking aborts, and the
+ones already unpacked will fail to configure in the recovery phase
+because its dependencies are unavailable.</p>
+
+<p>In this log, the problem manifest itself with this error:</p>
+
+<blockquote><pre>
+dpkg: dependency problems prevent configuration of perl-modules:
+ perl-modules depends on perl (>= 5.10.1-1); however:
+ Version of perl on system is 5.10.0-19lenny2.
+dpkg: error processing perl-modules (--configure):
+ dependency problems - leaving unconfigured
+</pre></blockquote>
+
+<p>The perl/perl-modules circular dependency is already
+<a href="http://bugs.debian.org/527917">reported as a bug</a>, and will
+hopefully be solved as soon as possible, but it is not the only one,
+and each one of these loops in the dependency tree can cause similar
+failures. Of course, they only occur when there are bugs in other
+packages causing the unpacking to fail, but it is rather nasty when
+the failure of one package causes the problem to become worse because
+of dependency loops.</p>
+
+<p>Thanks to
+<a href="http://lists.debian.org/debian-devel/2010/06/msg00116.html">the
+tireless effort by Bill Allombert</a>, the number of circular
+dependencies
+<a href="http://debian.semistable.com/debgraph.out.html">left in Debian
+is dropping</a>, and perhaps it will reach zero one day. :)</p>
+
+<p>Todays testing also exposed a bug in
+<a href="http://bugs.debian.org/590605">update-notifier</a> and
+<a href="http://bugs.debian.org/590604">different behaviour</a> between
+apt-get and aptitude, the latter possibly caused by some circular
+dependency. Reported both to BTS to try to get someone to look at
+it.</p>
+</description>
+ </item>
+
<item>
<title>First Debian Edu test release (alpha0) based on Squeeze is released</title>
<link>http://people.skolelinux.org/pere/blog/First_Debian_Edu_test_release__alpha0__based_on_Squeeze_is_released.html</link>
</description>
</item>
- <item>
- <title>Lenny->Squeeze upgrades, apt vs aptitude with the Gnome desktop</title>
- <link>http://people.skolelinux.org/pere/blog/Lenny__Squeeze_upgrades__apt_vs_aptitude_with_the_Gnome_desktop.html</link>
- <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Lenny__Squeeze_upgrades__apt_vs_aptitude_with_the_Gnome_desktop.html</guid>
- <pubDate>Sat, 3 Jul 2010 23:55:00 +0200</pubDate>
- <description>
-<p>Here is a short update on my <a
-href="http://people.skolelinux.org/~pere/debian-upgrade-testing/">my
-Debian Lenny->Squeeze upgrade testing</a>. Here is a summary of the
-difference for Gnome when it is upgraded by apt-get and aptitude. I'm
-not reporting the status for KDE, because the upgrade crashes when
-aptitude try because of missing conflicts
-(<a href="http://bugs.debian.org/584861">#584861</a> and
-<a href="http://bugs.debian.org/585716">#585716</a>).</p>
-
-<p>At the end of the upgrade test script, dpkg -l is executed to get a
-complete list of the installed packages. Based on this I see these
-differences when I did a test run today. As usual, I do not really
-know what the correct set of packages would be, but thought it best to
-publish the difference.</p>
-
-<p>Installed using apt-get, missing with aptitude</p>
-
-<blockquote><p>
- at-spi cpp-4.3 finger gnome-spell gstreamer0.10-gnomevfs
- libatspi1.0-0 libcupsys2 libeel2-data libgail-common libgdl-1-common
- libgnomeprint2.2-data libgnomeprintui2.2-common libgnomevfs2-bin
- libgtksourceview-common libpt-1.10.10-plugins-alsa
- libpt-1.10.10-plugins-v4l libservlet2.4-java libxalan2-java
- libxerces2-java openoffice.org-writer2latex openssl-blacklist p7zip
- python-4suite-xml python-eggtrayicon python-gtkhtml2
- python-gtkmozembed svgalibg1 xserver-xephyr zip
-</p></blockquote>
-
-<p>Installed using apt-get, removed with aptitude</p>
-
-<blockquote><p>
- bluez-utils dhcdbd djvulibre-desktop epiphany-gecko
- gnome-app-install gnome-mount gnome-vfs-obexftp gnome-volume-manager
- libao2 libavahi-compat-libdnssd1 libavahi-core5 libbind9-50
- libbluetooth2 libcamel1.2-11 libcdio7 libcucul0 libcurl3
- libdirectfb-1.0-0 libdvdread3 libedata-cal1.2-6 libedataserver1.2-9
- libeel2-2.20 libepc-1.0-1 libepc-ui-1.0-1 libexchange-storage1.2-3
- libfaad0 libgd2-noxpm libgda3-3 libgda3-common libggz2 libggzcore9
- libggzmod4 libgksu1.2-0 libgksuui1.0-1 libgmyth0 libgnome-desktop-2
- libgnome-pilot2 libgnomecups1.0-1 libgnomeprint2.2-0
- libgnomeprintui2.2-0 libgpod3 libgraphviz4 libgtkhtml2-0
- libgtksourceview1.0-0 libgucharmap6 libhesiod0 libicu38 libisccc50
- libisccfg50 libiw29 libkpathsea4 libltdl3 liblwres50 libmagick++10
- libmagick10 libmalaga7 libmtp7 libmysqlclient15off libnautilus-burn4
- libneon27 libnm-glib0 libnm-util0 libopal-2.2 libosp5
- libparted1.8-10 libpisock9 libpisync1 libpoppler-glib3 libpoppler3
- libpt-1.10.10 libraw1394-8 libsensors3 libsmbios2 libsoup2.2-8
- libssh2-1 libsuitesparse-3.1.0 libswfdec-0.6-90 libtalloc1
- libtotem-plparser10 libtrackerclient0 libvoikko1 libxalan2-java-gcj
- libxerces2-java-gcj libxklavier12 libxtrap6 libxxf86misc1 libzephyr3
- mysql-common swfdec-gnome totem-gstreamer wodim
-</p></blockquote>
-
-<p>Installed using aptitude, missing with apt-get</p>
-
-<blockquote><p>
- gnome gnome-desktop-environment hamster-applet python-gnomeapplet
- python-gnomekeyring python-wnck rhythmbox-plugins xorg
- xserver-xorg-input-all xserver-xorg-input-evdev
- xserver-xorg-input-kbd xserver-xorg-input-mouse
- xserver-xorg-input-synaptics xserver-xorg-video-all
- xserver-xorg-video-apm xserver-xorg-video-ark xserver-xorg-video-ati
- xserver-xorg-video-chips xserver-xorg-video-cirrus
- xserver-xorg-video-dummy xserver-xorg-video-fbdev
- xserver-xorg-video-glint xserver-xorg-video-i128
- xserver-xorg-video-i740 xserver-xorg-video-mach64
- xserver-xorg-video-mga xserver-xorg-video-neomagic
- xserver-xorg-video-nouveau xserver-xorg-video-nv
- xserver-xorg-video-r128 xserver-xorg-video-radeon
- xserver-xorg-video-radeonhd xserver-xorg-video-rendition
- xserver-xorg-video-s3 xserver-xorg-video-s3virge
- xserver-xorg-video-savage xserver-xorg-video-siliconmotion
- xserver-xorg-video-sis xserver-xorg-video-sisusb
- xserver-xorg-video-tdfx xserver-xorg-video-tga
- xserver-xorg-video-trident xserver-xorg-video-tseng
- xserver-xorg-video-vesa xserver-xorg-video-vmware
- xserver-xorg-video-voodoo
-</p></blockquote>
-
-<p>Installed using aptitude, removed with apt-get</p>
-
-<blockquote><p>
- deskbar-applet xserver-xorg xserver-xorg-core
- xserver-xorg-input-wacom xserver-xorg-video-intel
- xserver-xorg-video-openchrome
-</p></blockquote>
-
-<p>I was told on IRC that the xorg-xserver package was
-<a href="http://git.debian.org/?p=pkg-xorg/xserver/xorg-server.git;a=commit;h=9c8080d06c457932d3bfec021c69ac000aa60120">changed
-in git</a> today to try to get apt-get to not remove xorg completely.
-No idea when it hits Squeeze, but when it does I hope it will reduce
-the difference somewhat.
-</description>
- </item>
-
</channel>
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