<atom:link href="http://people.skolelinux.org/pere/blog/index.rss" rel="self" type="application/rss+xml" />
<item>
- <title>KDM fail at boot with NVidia cards - and no one try to fix it?</title>
- <link>http://people.skolelinux.org/pere/blog/KDM_fail_at_boot_with_NVidia_cards___and_no_one_try_to_fix_it_.html</link>
- <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/KDM_fail_at_boot_with_NVidia_cards___and_no_one_try_to_fix_it_.html</guid>
- <pubDate>Tue, 1 Jun 2010 17:05:00 +0200</pubDate>
+ <title>Some notes on Flash in Debian and Debian Edu</title>
+ <link>http://people.skolelinux.org/pere/blog/Some_notes_on_Flash_in_Debian_and_Debian_Edu.html</link>
+ <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Some_notes_on_Flash_in_Debian_and_Debian_Edu.html</guid>
+ <pubDate>Sat, 4 Sep 2010 10:10:00 +0200</pubDate>
<description>
-<p>It is strange to watch how a bug in Debian causing KDM to fail to
-start at boot when an NVidia video card is used. The problem seem to
-be that the nvidia X.org driver uses a long time to initialize, and
-this duration is longer than kdm is configured to wait.</p>
-
-<p>I came across two bugs related to this issue,
-<a href="http://bugs.debian.org/583312">#583312</a> initially filed
-against initscripts and passed on to nvidia-glx when it became obvious
-that the nvidia drivers were involved, and
-<a href="http://bugs.debian.org/524751">#524751</a> initially filed against
-kdm and passed on to src:nvidia-graphics-drivers for unknown reasons.</p>
-
-<p>To me, it seem that no-one is interested in actually solving the
-problem nvidia video card owners experience and make sure the Debian
-distribution work out of the box for these users. The nvidia driver
-maintainers expect kdm to be set up to wait longer, while kdm expect
-the nvidia driver maintainers to fix the driver start faster, and
-while they wait for each other I guess the users end up switching to a
-distribution that work for them. I have no idea what the solution is,
-but I am pretty sure that waiting for each other is not it.</p>
-
-<p>I wonder why we end up handling bugs this way.</p>
+<p>In the <a href="http://popcon.debian.org/unknown/by_vote">Debian
+popularity-contest numbers</a>, the adobe-flashplugin package the
+second most popular used package that is missing in Debian. The sixth
+most popular is flashplayer-mozilla. This is a clear indication that
+working flash is important for Debian users. Around 10 percent of the
+users submitting data to popcon.debian.org have this package
+installed.</p>
+
+<p>In the report written by Lars Risan in August 2008
+(«<a href="http://wiki.skolelinux.no/Dokumentasjon/Rapporter?action=AttachFile&do=view&target=Skolelinux_i_bruk_rapport_1.0.pdf">Skolelinux
+i bruk – Rapport for Hurum kommune, Universitetet i Agder og
+stiftelsen SLX Debian Labs</a>»), one of the most important problems
+schools experienced with <a href="http://www.skolelinux.org/">Debian
+Edu/Skolelinux</a> was the lack of working Flash. A lot of educational
+web sites require Flash to work, and lacking working Flash support in
+the web browser and the problems with installing it was perceived as a
+good reason to stay with Windows.</p>
+
+<p>I once saw a funny and sad comment in a web forum, where Linux was
+said to be the retarded cousin that did not really understand
+everything you told him but could work fairly well. This was a
+comment regarding the problems Linux have with proprietary formats and
+non-standard web pages, and is sad because it exposes a fairly common
+understanding of whose fault it is if web pages that only work in for
+example Internet Explorer 6 fail to work on Firefox, and funny because
+it explain very well how annoying it is for users when Linux
+distributions do not work with the documents they receive or the web
+pages they want to visit.</p>
+
+<p>This is part of the reason why I believe it is important for Debian
+and Debian Edu to have a well working Flash implementation in the
+distribution, to get at least popular sites as Youtube and Google
+Video to working out of the box. For Squeeze, Debian have the chance
+to include the latest version of Gnash that will make this happen, as
+the new release 0.8.8 was published a few weeks ago and is resting in
+unstable. The new version work with more sites that version 0.8.7.
+The Gnash maintainers have asked for a freeze exception, but the
+release team have not had time to reply to it yet. I hope they agree
+with me that Flash is important for the Debian desktop users, and thus
+accept the new package into Squeeze.</p>
</description>
</item>
<item>
- <title>Parallellized boot seem to hold up well in Debian/testing</title>
- <link>http://people.skolelinux.org/pere/blog/Parallellized_boot_seem_to_hold_up_well_in_Debian_testing.html</link>
- <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Parallellized_boot_seem_to_hold_up_well_in_Debian_testing.html</guid>
- <pubDate>Thu, 27 May 2010 23:55:00 +0200</pubDate>
+ <title>My first perl GUI application - controlling a Spykee robot</title>
+ <link>http://people.skolelinux.org/pere/blog/My_first_perl_GUI_application___controlling_a_Spykee_robot.html</link>
+ <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/My_first_perl_GUI_application___controlling_a_Spykee_robot.html</guid>
+ <pubDate>Wed, 1 Sep 2010 21:00:00 +0200</pubDate>
<description>
-<p>A few days ago, parallel booting was enabled in Debian/testing.
-The feature seem to hold up pretty well, but three fairly serious
-issues are known and should be solved:
-
-<p><ul>
-
-<li>The wicd package seen to
-<a href="http://bugs.debian.org/508289">break NFS mounting</a> and
-<a href="http://bugs.debian.org/581586">network setup</a> when
-parallel booting is enabled. No idea why, but the wicd maintainer
-seem to be on the case.</li>
-
-<li>The nvidia X driver seem to
-<a href="http://bugs.debian.org/583312">have a race condition</a>
-triggered more easily when parallel booting is in effect. The
-maintainer is on the case.</li>
-
-<li>The sysv-rc package fail to properly enable dependency based boot
-sequencing (the shutdown is broken) when old file-rc users
-<a href="http://bugs.debian.org/575080">try to switch back</a> to
-sysv-rc. One way to solve it would be for file-rc to create
-/etc/init.d/.legacy-bootordering, and another is to try to make
-sysv-rc more robust. Will investigate some more and probably upload a
-workaround in sysv-rc to help those trying to move from file-rc to
-sysv-rc get a working shutdown.</li>
-
-</ul></p>
-
-<p>All in all not many surprising issues, and all of them seem
-solvable before Squeeze is released. In addition to these there are
-some packages with bugs in their dependencies and run level settings,
-which I expect will be fixed in a reasonable time span.</p>
-
-<p>If you report any problems with dependencies in init.d scripts to
-the BTS, please usertag the report to get it to show up at
-<a href="http://bugs.debian.org/cgi-bin/pkgreport.cgi?users=initscripts-ng-devel@lists.alioth.debian.org">the
-list of usertagged bugs related to this</a>.</p>
-
-<p>Update: Correct bug number to file-rc issue.</p>
+<p>This evening I made my first Perl GUI application. The last few
+days I have worked on a Perl module for controlling my recently
+aquired Spykee robots, and the module is now getting complete enought
+that it is possible to use it to control the robot driving at least.
+It was now time to figure out how to use it to create some GUI to
+allow me to drive the robot around. I picked PerlQt as I have had
+positive experiences with the Qt API before, and spent a few minutes
+browsing the web for examples. Using Qt Designer seemed like a short
+cut, so I ended up writing the perl GUI using Qt Designer and
+compiling it into a perl program using the puic program from
+libqt-perl. Nothing fancy yet, but it got buttons to connect and
+drive around.</p>
+
+<p>The perl module I have written provide a object oriented API for
+controlling the robot. Here is an small example on how to use it:</p>
+
+<p><pre>
+use Spykee;
+Spykee::discover(sub {$robot{$_[0]} = $_[1]});
+my $host = (keys %robot)[0];
+my $spykee = Spykee->new();
+$spykee->contact($host, "admin", "admin");
+$spykee->left();
+sleep 2;
+$spykee->right();
+sleep 2;
+$spykee->forward();
+sleep 2;
+$spykee->back();
+sleep 2;
+$spykee->stop();
+</pre></p>
+
+<p>Thanks to the release of the source of the robot firmware, I could
+peek into the implementation at the other end to figure out how to
+implement the protocol used by the robot. I've implemented several of
+the commands the robot understand, but is still missing the camera
+support to make it possible to control the robot from remote. First I
+want to implement support for uploading new firmware and configuring
+the wireless network, to make it possible to bootstrap a Spykee robot
+without the producers Windows and MacOSX software (I only have Linux,
+so I had to ask a friend to come over to get the robot testing
+going. :).</p>
+
+<p>Will release the source to the public soon, but need to figure out
+where to make it available first. I will add a link to
+<a href="http://wiki.nuug.no/grupper/robot/">the NUUG wiki</a> for
+those that want to check back later to find it.</p>
</description>
</item>
<item>
- <title>More flexible firmware handling in debian-installer</title>
- <link>http://people.skolelinux.org/pere/blog/More_flexible_firmware_handling_in_debian_installer.html</link>
- <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/More_flexible_firmware_handling_in_debian_installer.html</guid>
- <pubDate>Sat, 22 May 2010 21:30:00 +0200</pubDate>
+ <title>Forslag i stortinget om å stoppe elektronisk stemmegiving i Norge</title>
+ <link>http://people.skolelinux.org/pere/blog/Forslag_i_stortinget_om____stoppe_elektronisk_stemmegiving_i_Norge.html</link>
+ <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Forslag_i_stortinget_om____stoppe_elektronisk_stemmegiving_i_Norge.html</guid>
+ <pubDate>Tue, 31 Aug 2010 21:00:00 +0200</pubDate>
<description>
-<p>After a long break from debian-installer development, I finally
-found time today to return to the project. Having to spend less time
-working dependency based boot in debian, as it is almost complete now,
-definitely helped freeing some time.</p>
-
-<p>A while back, I ran into a problem while working on Debian Edu. We
-include some firmware packages on the Debian Edu CDs, those needed to
-get disk and network controllers working. Without having these
-firmware packages available during installation, it is impossible to
-install Debian Edu on the given machine, and because our target group
-are non-technical people, asking them to provide firmware packages on
-an external medium is a support pain. Initially, I expected it to be
-enough to include the firmware packages on the CD to get
-debian-installer to find and use them. This proved to be wrong.
-Next, I hoped it was enough to symlink the relevant firmware packages
-to some useful location on the CD (tried /cdrom/ and
-/cdrom/firmware/). This also proved to not work, and at this point I
-found time to look at the debian-installer code to figure out what was
-going to work.</p>
-
-<p>The firmware loading code is in the hw-detect package, and a closer
-look revealed that it would only look for firmware packages outside
-the installation media, so the CD was never checked for firmware
-packages. It would only check USB sticks, floppies and other
-"external" media devices. Today I changed it to also look in the
-/cdrom/firmware/ directory on the mounted CD or DVD, which should
-solve the problem I ran into with Debian edu. I also changed it to
-look in /firmware/, to make sure the installer also find firmware
-provided in the initrd when booting the installer via PXE, to allow us
-to provide the same feature in the PXE setup included in Debian
-Edu.</p>
-
-<p>To make sure firmware deb packages with a license questions are not
-activated without asking if the license is accepted, I extended
-hw-detect to look for preinst scripts in the firmware packages, and
-run these before activating the firmware during installation. The
-license question is asked using debconf in the preinst, so this should
-solve the issue for the firmware packages I have looked at so far.</p>
-
-<p>If you want to discuss the details of these features, please
-contact us on debian-boot@lists.debian.org.</p>
+<p>Ble tipset i dag om at et forslag om å stoppe forsøkene med
+elektronisk stemmegiving utenfor valglokaler er
+<a href="http://www.stortinget.no/no/Saker-og-publikasjoner/Saker/Sak/?p=46616">til
+behandling</a> i Stortinget.
+<a href="http://www.stortinget.no/Global/pdf/Representantforslag/2009-2010/dok8-200910-128.pdf">Forslaget</a>
+er fremmet av Erna Solberg, Michael Tetzschner og Trond Helleland.</p>
+
+<p>Håper det får flertall.</p>
</description>
</item>
<item>
- <title>Magnetstripeinnhold i billetter fra Flytoget og Hurtigruten</title>
- <link>http://people.skolelinux.org/pere/blog/Magnetstripeinnhold_i_billetter_fra_Flytoget_og_Hurtigruten.html</link>
- <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Magnetstripeinnhold_i_billetter_fra_Flytoget_og_Hurtigruten.html</guid>
- <pubDate>Fri, 21 May 2010 16:00:00 +0200</pubDate>
+ <title>Broken hard link handling with sshfs</title>
+ <link>http://people.skolelinux.org/pere/blog/Broken_hard_link_handling_with_sshfs.html</link>
+ <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Broken_hard_link_handling_with_sshfs.html</guid>
+ <pubDate>Mon, 30 Aug 2010 19:30:00 +0200</pubDate>
<description>
-<p>For en stund tilbake kjøpte jeg en magnetkortleser for å kunne
-titte på hva som er skrevet inn på magnetstripene til ulike kort. Har
-ikke hatt tid til å analysere mange kort så langt, men tenkte jeg
-skulle dele innholdet på to kort med mine lesere.</p>
-
-<p>For noen dager siden tok jeg flyet til Harstad og Hurtigruten til
-Bergen. Flytoget fra Oslo S til flyplassen ga meg en billett med
-magnetstripe. Påtrykket finner jeg følgende informasjon:</p>
+<p>Just got an email from Tobias Gruetzmacher as a followup on my
+<a href="http://people.skolelinux.org/pere/blog/Broken_umask_handling_with_sshfs.html">previous
+post about sshfs</a>. He reported another problem with sshfs. It
+fail to handle hard links properly. A simple way to spot this is to
+look at the . and .. entries in the directory tree. These should have
+a link count >1, but on sshfs the count is 1. I just tested to see
+what happen when trying to hardlink, and this fail as well:</p>
<pre>
-Flytoget Airport Express Train
-
-Fra - Til : Oslo Sentralstasjon
-Kategori : Voksen
-Pris : Nok 170,00
-Herav mva. 8,00% : NOK 12,59
-Betaling : Kontant
-Til - Fra : Oslo Lufthavn
-Utstedt: : 08.05.10
-Gyldig Fra-Til : 08.05.10-07.11.10
-Billetttype : Enkeltbillett
-
-102-1015-100508-48382-01-08
+% ln foo bar
+ln: creating hard link `bar' => `foo': Function not implemented
+%
</pre>
-<p>På selve magnetstripen er innholdet
-<tt>;E?+900120011=23250996541068112619257138248441708433322932704083389389062603279671261502492655?</tt>.
-Aner ikke hva innholdet representerer, og det er lite overlapp mellom
-det jeg ser trykket på billetten og det jeg ser av tegn i
-magnetstripen. Håper det betyr at de bruker kryptografiske metoder
-for å gjøre det vanskelig å forfalske billetter.</p>
-
-<p>Den andre billetten er fra Hurtigruten, der jeg mistenker at
-strekkoden på fronten er mer brukt enn magnetstripen (det var i hvert
-fall den biten vi stakk inn i dørlåsen).</p>
-
-<p>Påtrykket forsiden er følgende:</p>
-
-<pre>
-Romnummer 727
-Hurtigruten
-Midnatsol
-Reinholdtsen
-Petter
-Bookingno: SAX69 0742193
-Harstad-Bergen
-Dep: 09.05.2010 Arr: 12.05.2010
-Lugar fra Risøyhamn
-Kost: FRO=4
-</pre>
+<p>I have not yet found time to implement a test for this in my file
+system test code, but believe having working hard links is useful to
+avoid surprised unix programs. Not as useful as working file locking
+and symlinks, which are required to get a working desktop, but useful
+nevertheless. :)</p>
-<p>På selve magnetstripen er innholdet
-<tt>;1316010007421930=00000000000000000000?+E?</tt>. Heller ikke her
-ser jeg mye korrespondanse mellom påtrykk og magnetstripe.</p>
+<p>The latest version of the file system test code is available via
+git from
+<a href="http://github.com/gebi/fs-test">http://github.com/gebi/fs-test</a></p>
</description>
</item>
<item>
- <title>Pieces of the roaming laptop puzzle in Debian</title>
- <link>http://people.skolelinux.org/pere/blog/Pieces_of_the_roaming_laptop_puzzle_in_Debian.html</link>
- <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Pieces_of_the_roaming_laptop_puzzle_in_Debian.html</guid>
- <pubDate>Wed, 19 May 2010 19:00:00 +0200</pubDate>
+ <title>Sikkerhetsteateret på flyplassene fortsetter</title>
+ <link>http://people.skolelinux.org/pere/blog/Sikkerhetsteateret_p___flyplassene_fortsetter.html</link>
+ <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Sikkerhetsteateret_p___flyplassene_fortsetter.html</guid>
+ <pubDate>Sat, 28 Aug 2010 10:40:00 +0200</pubDate>
<description>
-<p>Today, the last piece of the puzzle for roaming laptops in Debian
-Edu finally entered the Debian archive. Today, the new
-<a href="http://packages.qa.debian.org/libp/libpam-mklocaluser.html">libpam-mklocaluser</a>
-package was accepted. Two days ago, two other pieces was accepted
-into unstable. The
-<a href="http://packages.qa.debian.org/p/pam-python.html">pam-python</a>
-package needed by libpam-mklocaluser, and the
-<a href="http://packages.qa.debian.org/s/sssd.html">sssd</a> package
-passed NEW on Monday. In addition, the
-<a href="http://packages.qa.debian.org/libp/libpam-ccreds.html">libpam-ccreds</a>
-package we need is in experimental (version 10-4) since Saturday, and
-hopefully will be moved to unstable soon.</p>
-
-<p>This collection of packages allow for two different setups for
-roaming laptops. The traditional setup would be using libpam-ccreds,
-nscd and libpam-mklocaluser with LDAP or Kerberos authentication,
-which should work out of the box if the configuration changes proposed
-for nscd in <a href="http://bugs.debian.org/485282">BTS report
-#485282</a> is implemented. The alternative setup is to use sssd with
-libpam-mklocaluser to connect to LDAP or Kerberos and let sssd take
-care of the caching of passwords and group information.</p>
-
-<p>I have so far been unable to get sssd to work with the LDAP server
-at the University, but suspect the issue is some SSL/GnuTLS related
-problem with the server certificate. I plan to update the Debian
-package to version 1.2, which is scheduled for next week, and hope to
-find time to make sure the next release will include both the
-Debian/Ubuntu specific patches. Upstream is friendly and responsive,
-and I am sure we will find a good solution.</p>
-
-<p>The idea is to set up the roaming laptops to authenticate using
-LDAP or Kerberos and create a local user with home directory in /home/
-when a usre in LDAP logs in via KDM or GDM for the first time, and
-cache the password for offline checking, as well as caching group
-memberhips and other relevant LDAP information. The
-libpam-mklocaluser package was created to make sure the local home
-directory is in /home/, instead of /site/server/directory/ which would
-be the home directory if pam_mkhomedir was used. To avoid confusion
-with support requests and configuration, we do not want local laptops
-to have users in a path that is used for the same users home directory
-on the home directory servers.</p>
-
-<p>One annoying problem with gdm is that it do not show the PAM
-message passed to the user from libpam-mklocaluser when the local user
-is created. Instead gdm simply reject the login with some generic
-message. The message is shown in kdm, ssh and login, so I guess it is
-a bug in gdm. Have not investigated if there is some other message
-type that can be used instead to get gdm to also show the message.</p>
-
-<p>If you want to help out with implementing this for Debian Edu,
-please contact us on debian-edu@lists.debian.org.</p>
+<p>Jeg skrev for et halvt år siden hvordan
+<a href="http://people.skolelinux.org/pere/blog/Sikkerhet__teater__og_hvordan_gj__re_verden_sikrere.html">samfunnet
+kaster bort ressurser på sikkerhetstiltak som ikke fungerer</a>. Kom
+nettopp over en
+<a href="http://www.askthepilot.com/essays-and-stories/terrorism-tweezers-and-terminal-madness-an-essay-on-security/">historie
+fra en pilot fra USA</a> som kommenterer det samme. Jeg mistenker det
+kun er uvitenhet og autoritetstro som gjør at så få protesterer. Har
+veldig sans for piloten omtalt i <a
+href="http://www.aftenposten.no/nyheter/iriks/article2057501.ece">Aftenposten</a> 2007-10-23,
+og skulle ønske flere rettet oppmerksomhet mot problemet. Det gir
+ikke meg trygghetsfølelse på flyplassene når jeg ser at
+flyplassadministrasjonen kaster bort folk, penger og tid på tull i
+stedet for ting som bidrar til reell økning av sikkerheten. Det
+forteller meg jo at vurderingsevnen til de som burde bidra til økt
+sikkerhet er svært sviktende, noe som ikke taler godt for de andre
+tiltakene.</p>
+
+<p>Mon tro hva som skjer hvis det fantes en enkel brosjyre å skrive ut
+fra Internet som forklarte hva som er galt med sikkerhetsopplegget på
+flyplassene, og folk skrev ut og la en bunke på flyplassene når de
+passerte. Kanskje det ville fått flere til å få øynene opp for
+problemet.</p>
+
+<p>Personlig synes jeg flyopplevelsen er blitt så avskyelig at jeg
+forsøker å klare meg med tog, bil og båt for å slippe ubehaget. Det
+er dog noe vanskelig i det langstrakte Norge og for å kunne besøke de
+delene av verden jeg ønsker å nå. Mistenker at flere har det slik, og
+at dette går ut over inntjeningen til flyselskapene. Det er antagelig
+en god ting sett fra et miljøperspektiv, men det er en annen sak.</p>
</description>
</item>
<item>
- <title>Parallellized boot is now the default in Debian/unstable</title>
- <link>http://people.skolelinux.org/pere/blog/Parallellized_boot_is_now_the_default_in_Debian_unstable.html</link>
- <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Parallellized_boot_is_now_the_default_in_Debian_unstable.html</guid>
- <pubDate>Fri, 14 May 2010 22:40:00 +0200</pubDate>
+ <title>Skolelinux i Osloskolen</title>
+ <link>http://people.skolelinux.org/pere/blog/Skolelinux_i_Osloskolen.html</link>
+ <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Skolelinux_i_Osloskolen.html</guid>
+ <pubDate>Thu, 26 Aug 2010 22:25:00 +0200</pubDate>
<description>
-<p>Since this evening, parallel booting is the default in
-Debian/unstable for machines using dependency based boot sequencing.
-Apparently the testing of concurrent booting has been wider than
-expected, if I am to believe the
-<a href="http://lists.debian.org/debian-devel/2010/05/msg00122.html">input
-on debian-devel@</a>, and I concluded a few days ago to move forward
-with the feature this weekend, to give us some time to detect any
-remaining problems before Squeeze is frozen. If serious problems are
-detected, it is simple to change the default back to sequential boot.
-The upload of the new sysvinit package also activate a new upstream
-version.</p>
-
-More information about
-<a href="http://wiki.debian.org/LSBInitScripts/DependencyBasedBoot">dependency
-based boot sequencing</a> is available from the Debian wiki. It is
-currently possible to disable parallel booting when one run into
-problems caused by it, by adding this line to /etc/default/rcS:</p>
-
-<blockquote><pre>
-CONCURRENCY=none
-</pre></blockquote>
-
-<p>If you report any problems with dependencies in init.d scripts to
-the BTS, please usertag the report to get it to show up at
-<a href="http://bugs.debian.org/cgi-bin/pkgreport.cgi?users=initscripts-ng-devel@lists.alioth.debian.org">the
-list of usertagged bugs related to this</a>.</p>
+<p>Denne høsten skal endelig alle Osloskolene få mulighet til å bruke
+<a href="http://www.skolelinux.org/">Skolelinux</a>. Ny IT-løsning
+har vært rullet ut i noen måneder nå, og så vidt jeg fikk vite før
+sommeren skulle alle skoler ha nytt opplegg på plass før oppstart nå i
+høst. På alle skolene skal en kunne velge ved installasjon om en skal
+ha Windows eller Skolelinux på maskinene, og en kan i tillegg
+PXE-boote maskinene over nett som tynne klienter eller diskløse
+arbeidsstasjoner. Jeg er spent på hvor mange skoler som velger å ta i
+bruk Skolelinux, og gleder meg til å se hvordan dette utvikler seg.
+Løsningen leveres av
+<a href="http://www.logica.no/">Logica</a> med
+<a href="http://www.slxdrift.no/">Skolelinux Drift AS</a> som
+underleverandør, og jeg har vært involvert i utviklingen av løsningen
+via Skolelinux Drift AS siden prosjektet starter. Jeg synes det er
+fantastisk at Skolelinux er kommet så langt siden vi startet i 2001 at
+alle elevene i Osloskolene nå skal få mulighet til å bruke
+løsningen. Jeg håper de vil sette pris på alle de
+<a href="http://www.skolelinux.no/linux-signpost/">fantastiske
+brukerprogrammene</a> som er tilgjengelig i Skolelinux.</p>
</description>
</item>
<item>
- <title>Sitesummary tip: Listing MAC address of all clients</title>
- <link>http://people.skolelinux.org/pere/blog/Sitesummary_tip__Listing_MAC_address_of_all_clients.html</link>
- <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Sitesummary_tip__Listing_MAC_address_of_all_clients.html</guid>
- <pubDate>Fri, 14 May 2010 21:10:00 +0200</pubDate>
+ <title>Broken umask handling with sshfs</title>
+ <link>http://people.skolelinux.org/pere/blog/Broken_umask_handling_with_sshfs.html</link>
+ <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Broken_umask_handling_with_sshfs.html</guid>
+ <pubDate>Thu, 26 Aug 2010 13:30:00 +0200</pubDate>
<description>
-<p>In the recent Debian Edu versions, the
-<a href="http://wiki.debian.org/DebianEdu/HowTo/SiteSummary">sitesummary
-system</a> is used to keep track of the machines in the school
-network. Each machine will automatically report its status to the
-central server after boot and once per night. The network setup is
-also reported, and using this information it is possible to get the
-MAC address of all network interfaces in the machines. This is useful
-to update the DHCP configuration.</p>
-
-<p>To give some idea how to use sitesummary, here is a one-liner to
-ist all MAC addresses of all machines reporting to sitesummary. Run
-this on the collector host:</p>
-
-<blockquote><pre>
-perl -MSiteSummary -e 'for_all_hosts(sub { print join(" ", get_macaddresses(shift)), "\n"; });'
-</pre></blockquote>
-
-<p>This will list all MAC addresses assosiated with all machine, one
-line per machine and with space between the MAC addresses.</p>
-
-<p>To allow system administrators easier job at adding static DHCP
-addresses for hosts, it would be possible to extend this to fetch
-machine information from sitesummary and update the DHCP and DNS
-tables in LDAP using this information. Such tool is unfortunately not
-written yet.</p>
+<p>My file system sematics program
+<a href="http://people.skolelinux.org/pere/blog/Testing_if_a_file_system_can_be_used_for_home_directories___.html">presented
+a few days ago</a> is very useful to verify that a file system can
+work as a unix home directory,and today I had to extend it a bit. I'm
+looking into alternatives for home directory access here at the
+University of Oslo, and one of the options is sshfs. My friend
+Finn-Arne mentioned a while back that they had used sshfs with Debian
+Edu, but stopped because of problems. I asked today what the problems
+where, and he mentioned that sshfs failed to handle umask properly.
+Trying to detect the problem I wrote this addition to my fs testing
+script:</p>
+
+<pre>
+mode_t touch_get_mode(const char *name, mode_t mode) {
+ mode_t retval = 0;
+ int fd = open(name, O_RDWR|O_CREAT|O_LARGEFILE, mode);
+ if (-1 != fd) {
+ unlink(name);
+ struct stat statbuf;
+ if (-1 != fstat(fd, &statbuf)) {
+ retval = statbuf.st_mode & 0x1ff;
+ }
+ close(fd);
+ }
+ return retval;
+}
+
+/* Try to detect problem discovered using sshfs */
+int test_umask(void) {
+ printf("info: testing umask effect on file creation\n");
+
+ mode_t orig_umask = umask(000);
+ mode_t newmode;
+ if (0666 != (newmode = touch_get_mode("foobar", 0666))) {
+ printf(" error: Wrong file mode %o when creating using mode 666 and umask 000\n",
+ newmode);
+ }
+ umask(007);
+ if (0660 != (newmode = touch_get_mode("foobar", 0666))) {
+ printf(" error: Wrong file mode %o when creating using mode 666 and umask 007\n",
+ newmode);
+ }
+
+ umask (orig_umask);
+ return 0;
+}
+
+int main(int argc, char **argv) {
+ [...]
+ test_umask();
+ return 0;
+}
+</pre>
+
+<p>Sure enough. On NFS to a netapp, I get this result:</p>
+
+<pre>
+Testing POSIX/Unix sematics on file system
+info: testing symlink creation
+info: testing subdirectory creation
+info: testing fcntl locking
+ Read-locking 1 byte from 1073741824
+ Read-locking 510 byte from 1073741826
+ Unlocking 1 byte from 1073741824
+ Write-locking 1 byte from 1073741824
+ Write-locking 510 byte from 1073741826
+ Unlocking 2 byte from 1073741824
+info: testing umask effect on file creation
+</pre>
+
+<p>When mounting the same directory using sshfs, I get this
+result:</p>
+
+<pre>
+Testing POSIX/Unix sematics on file system
+info: testing symlink creation
+info: testing subdirectory creation
+info: testing fcntl locking
+ Read-locking 1 byte from 1073741824
+ Read-locking 510 byte from 1073741826
+ Unlocking 1 byte from 1073741824
+ Write-locking 1 byte from 1073741824
+ Write-locking 510 byte from 1073741826
+ Unlocking 2 byte from 1073741824
+info: testing umask effect on file creation
+ error: Wrong file mode 644 when creating using mode 666 and umask 000
+ error: Wrong file mode 640 when creating using mode 666 and umask 007
+</pre>
+
+<p>So, I can conclude that sshfs is better than smb to a Netapp or a
+Windows server, but not good enough to be used as a home
+directory.</p>
+
+<p>Update 2010-08-26: Reported the issue in
+<a href="http://bugs.debian.org/594498">BTS report #594498</a></p>
+
+<p>Update 2010-08-27: Michael Gebetsroither report that he found the
+script so useful that he created a GIT repository and stored it in
+<a href="http://github.com/gebi/fs-test">http://github.com/gebi/fs-test</a>.</p>
</description>
</item>
<item>
- <title>systemd, an interesting alternative to upstart</title>
- <link>http://people.skolelinux.org/pere/blog/systemd__an_interesting_alternative_to_upstart.html</link>
- <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/systemd__an_interesting_alternative_to_upstart.html</guid>
- <pubDate>Thu, 13 May 2010 22:20:00 +0200</pubDate>
+ <title>Elektronisk stemmegiving er ikke til å stole på - heller ikke i Norge</title>
+ <link>http://people.skolelinux.org/pere/blog/Elektronisk_stemmegiving_er_ikke_til____stole_p_____heller_ikke_i_Norge.html</link>
+ <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Elektronisk_stemmegiving_er_ikke_til____stole_p_____heller_ikke_i_Norge.html</guid>
+ <pubDate>Mon, 23 Aug 2010 19:30:00 +0200</pubDate>
<description>
-<p>The last few days a new boot system called
-<a href="http://www.freedesktop.org/wiki/Software/systemd">systemd</a>
-has been
-<a href="http://0pointer.de/blog/projects/systemd.html">introduced</a>
-
-to the free software world. I have not yet had time to play around
-with it, but it seem to be a very interesting alternative to
-<a href="http://upstart.ubuntu.com/">upstart</a>, and might prove to be
-a good alternative for Debian when we are able to switch to an event
-based boot system. Tollef is
-<a href="http://bugs.debian.org/580814">in the process</a> of getting
-systemd into Debian, and I look forward to seeing how well it work. I
-like the fact that systemd handles init.d scripts with dependency
-information natively, allowing them to run in parallel where upstart
-at the moment do not.</p>
-
-<p>Unfortunately do systemd have the same problem as upstart regarding
-platform support. It only work on recent Linux kernels, and also need
-some new kernel features enabled to function properly. This means
-kFreeBSD and Hurd ports of Debian will need a port or a different boot
-system. Not sure how that will be handled if systemd proves to be the
-way forward.</p>
-
-<p>In the mean time, based on the
-<a href="http://lists.debian.org/debian-devel/2010/05/msg00122.html">input
-on debian-devel@</a> regarding parallel booting in Debian, I have
-decided to enable full parallel booting as the default in Debian as
-soon as possible (probably this weekend or early next week), to see if
-there are any remaining serious bugs in the init.d dependencies. A
-new version of the sysvinit package implementing this change is
-already in experimental. If all go well, Squeeze will be released
-with parallel booting enabled by default.</p>
+<p>I Norge pågår en prosess for å
+<a href="http://www.e-valg.dep.no/">innføre elektronisk
+stemmegiving</a> ved kommune- og stortingsvalg. Dette skal
+introduseres i 2011. Det er all grunn til å tro at valg i Norge ikke
+vil være til å stole på hvis dette blir gjennomført. Da det hele var
+oppe til høring i 2006 forfattet jeg
+<a href="http://www.nuug.no/dokumenter/valg-horing-2006-09.pdf">en
+høringsuttalelse fra NUUG</a> (og EFN som hengte seg på) som skisserte
+hvilke punkter som må oppfylles for at en skal kunne stole på et valg,
+og elektronisk stemmegiving mangler flere av disse. Elektronisk
+stemmegiving er for alle praktiske formål å putte ens stemme i en sort
+boks under andres kontroll, og satse på at de som har kontroll med
+boksen er til å stole på - uten at en har mulighet til å verifisere
+dette selv. Det er ikke slik en gjennomfører demokratiske valg.</p>
+
+<p>Da problemet er fundamentalt med hvordan elektronisk stemmegiving
+må fungere for at også ikke-krypografer skal kunne delta, har det vært
+mange rapporter om hvordan elektronisk stemmegiving har sviktet i land
+etter land. En
+<a href="http://wiki.nuug.no/uttalelser/2006-elektronisk-stemmegiving">liten
+samling referanser</a> finnes på NUUGs wiki. Den siste er fra India,
+der valgkomisjonen har valgt
+<a href="http://www.freedom-to-tinker.com/blog/jhalderm/electronic-voting-researcher-arrested-over-anonymous-source">å
+pusse politiet på en forsker</a> som har dokumentert svakheter i
+valgsystemet.</p>
+
+<p>Her i Norge har en valgt en annen tilnærming, der en forsøker seg
+med teknobabbel for å få befolkningen til å tro at dette skal bli
+sikkert. Husk, elektronisk stemmegiving underminerer de demokratiske
+valgene i Norge, og bør ikke innføres.</p>
+
+<p>Den offentlige diskusjonen blir litt vanskelig av at media har
+valgt å kalle dette "evalg", som kan sies å både gjelde elektronisk
+opptelling av valget som Norge har gjort siden 60-tallet og som er en
+svært god ide, og elektronisk opptelling som er en svært dårlig ide.
+Diskusjonen gir ikke mening hvis en skal diskutere om en er for eller
+mot "evalg", og jeg forsøker derfor å være klar på at jeg snakker om
+elektronisk stemmegiving og unngå begrepet "evalg".</p>
</description>
</item>
<item>
- <title>Parallellizing the boot in Debian Squeeze - ready for wider testing</title>
- <link>http://people.skolelinux.org/pere/blog/Parallellizing_the_boot_in_Debian_Squeeze___ready_for_wider_testing.html</link>
- <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Parallellizing_the_boot_in_Debian_Squeeze___ready_for_wider_testing.html</guid>
- <pubDate>Thu, 6 May 2010 23:25:00 +0200</pubDate>
+ <title>Robot, reis deg...</title>
+ <link>http://people.skolelinux.org/pere/blog/Robot__reis_deg___.html</link>
+ <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Robot__reis_deg___.html</guid>
+ <pubDate>Sat, 21 Aug 2010 22:10:00 +0200</pubDate>
<description>
-<p>These days, the init.d script dependencies in Squeeze are quite
-complete, so complete that it is actually possible to run all the
-init.d scripts in parallell based on these dependencies. If you want
-to test your Squeeze system, make sure
-<a href="http://wiki.debian.org/LSBInitScripts/DependencyBasedBoot">dependency
-based boot sequencing</a> is enabled, and add this line to
-/etc/default/rcS:</p>
-
-<blockquote><pre>
-CONCURRENCY=makefile
-</pre></blockquote>
-
-<p>That is it. It will cause sysv-rc to use the startpar tool to run
-scripts in parallel using the dependency information stored in
-/etc/init.d/.depend.boot, /etc/init.d/.depend.start and
-/etc/init.d/.depend.stop to order the scripts. Startpar is configured
-to try to start the kdm and gdm scripts as early as possible, and will
-start the facilities required by kdm or gdm as early as possible to
-make this happen.</p>
-
-<p>Give it a try, and see if you like the result. If some services
-fail to start properly, it is most likely because they have incomplete
-init.d script dependencies in their startup script (or some of their
-dependent scripts have incomplete dependencies). Report bugs and get
-the package maintainers to fix it. :)</p>
-
-<p>Running scripts in parallel could be the default in Debian when we
-manage to get the init.d script dependencies complete and correct. I
-expect we will get there in Squeeze+1, if we get manage to test and
-fix the remaining issues.</p>
-
-<p>If you report any problems with dependencies in init.d scripts to
-the BTS, please usertag the report to get it to show up at
-<a href="http://bugs.debian.org/cgi-bin/pkgreport.cgi?users=initscripts-ng-devel@lists.alioth.debian.org">the
-list of usertagged bugs related to this</a>.</p>
+<p>I dag fikk jeg endelig tittet litt på mine nyinnkjøpte roboter, og
+har brukt noen timer til å google etter interessante referanser og
+aktuell kildekode for bruk på Linux. Det mest lovende så langt er
+<a href="http://ispykee.toyz.org/">ispykee</a>, som har en
+BSD-lisensiert linux-daemon som står som mellomledd mellom roboter på
+lokalnettet og en sentral tjeneste der en iPhone kan koble seg opp for
+å fjernstyre roboten. Linux-daemonen implementerer deler av
+protokollen som roboten forstår. Etter å ha knotet litt med å oppnå
+kontakt med roboten (den oppretter et eget ad-hoc wifi-nett, så jeg
+måtte gå av mitt vanlige nett for å få kontakt), og kommet frem til at
+den lytter på IP-port 9000 og 9001, gikk jeg i gang med å finne ut
+hvordan jeg kunne snakke med roboten vha. disse portene. Robotbiten
+av protokollen er publisert av produsenten med GPL-lisens, slik at det
+er mulig å se hvordan protokollen fungerer. Det finnes en java-klient
+for Android som så ganske snasen ut, men fant ingen kildekode for
+denne. Derimot hadde iphone-løsningen kildekode, så jeg tok
+utgangspunkt i den.</p>
+
+<p>Daemonen ville i utgangspunktet forsøke å kontakte den sentrale
+tjenesten som iphone-programmet kobler seg til. Jeg skrev dette om
+til i stedet å sette opp en nettverkstjeneste på min lokale maskin,
+som jeg kan koble meg opp til med telnet og gi kommandoer til roboten
+(act, forward, right, left, etc). Det involverte i praksis å bytte ut
+socket()/connect() med socket()/bind()/listen()/accept() for å gjøre
+klienten om til en tjener.</p>
+
+<p>Mens jeg har forsøkt å få roboten til å bevege seg har min samboer
+skrudd sammen resten av roboten for å få montert kamera og plastpynten
+(armer, plastfiber for lys). Nå er det hele montert, og roboten er
+klar til bruk. Må få flyttet den over til mitt vanlige trådløsnett
+før det blir praktisk, men de bitene av protokollen er ikke
+implementert i ispykee-daemonen, så der må jeg enten få tak i en mac
+eller en windows-maskin, eller implementere det selv.</p>
+
+<p>Vi var tre som kjøpte slike roboter, og vi har blitt enige om å
+samle notater og referanser på <a
+href="http://wiki.nuug.no/grupper/robot/">NUUGs wiki</a>. Ta en titt
+der hvis du er nysgjerrig.</p>
</description>
</item>
<item>
- <title>Forcing new users to change their password on first login</title>
- <link>http://people.skolelinux.org/pere/blog/Forcing_new_users_to_change_their_password_on_first_login.html</link>
- <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Forcing_new_users_to_change_their_password_on_first_login.html</guid>
- <pubDate>Sun, 2 May 2010 13:47:00 +0200</pubDate>
+ <title>2 Spykee-roboter i hus, nå skal det lekes</title>
+ <link>http://people.skolelinux.org/pere/blog/2_Spykee_roboter_i_hus__n___skal_det_lekes.html</link>
+ <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/2_Spykee_roboter_i_hus__n___skal_det_lekes.html</guid>
+ <pubDate>Wed, 18 Aug 2010 13:30:00 +0200</pubDate>
<description>
-<p>One interesting feature in Active Directory, is the ability to
-create a new user with an expired password, and thus force the user to
-change the password on the first login attempt.</p>
-
-<p>I'm not quite sure how to do that with the LDAP setup in Debian
-Edu, but did some initial testing with a local account. The account
-and password aging information is available in /etc/shadow, but
-unfortunately, it is not possible to specify an expiration time for
-passwords, only a maximum age for passwords.</p>
-
-<p>A freshly created account (using adduser test) will have these
-settings in /etc/shadow:</p>
-
-<blockquote><pre>
-root@tjener:~# chage -l test
-Last password change : May 02, 2010
-Password expires : never
-Password inactive : never
-Account expires : never
-Minimum number of days between password change : 0
-Maximum number of days between password change : 99999
-Number of days of warning before password expires : 7
-root@tjener:~#
-</pre></blockquote>
-
-<p>The only way I could come up with to create a user with an expired
-account, is to change the date of the last password change to the
-lowest value possible (January 1th 1970), and the maximum password age
-to the difference in days between that date and today. To make it
-simple, I went for 30 years (30 * 365 = 10950) and January 2th (to
-avoid testing if 0 is a valid value).</p>
-
-<p>After using these commands to set it up, it seem to work as
-intended:</p>
-
-<blockquote><pre>
-root@tjener:~# chage -d 1 test; chage -M 10950 test
-root@tjener:~# chage -l test
-Last password change : Jan 02, 1970
-Password expires : never
-Password inactive : never
-Account expires : never
-Minimum number of days between password change : 0
-Maximum number of days between password change : 10950
-Number of days of warning before password expires : 7
-root@tjener:~#
-</pre></blockquote>
-
-<p>So far I have tested this with ssh and console, and kdm (in
-Squeeze) login, and all ask for a new password before login in the
-user (with ssh, I was thrown out and had to log in again).</p>
-
-<p>Perhaps we should set up something similar for Debian Edu, to make
-sure only the user itself have the account password?</p>
-
-<p>If you want to comment on or help out with implementing this for
-Debian Edu, please contact us on debian-edu@lists.debian.org.</p>
-
-<p>Update 2010-05-02 17:20: Paul Tötterman tells me on IRC that the
-shadow(8) page in Debian/testing now state that setting the date of
-last password change to zero (0) will force the password to be changed
-on the first login. This was not mentioned in the manual in Lenny, so
-I did not notice this in my initial testing. I have tested it on
-Squeeze, and '<tt>chage -d 0 username</tt>' do work there. I have not
-tested it on Lenny yet.</p>
-
-<p>Update 2010-05-02-19:05: Jim Paris tells me via email that an
-equivalent command to expire a password is '<tt>passwd -e
-username</tt>', which insert zero into the date of the last password
-change.</p>
+<p>Jeg kjøpte nettopp to
+<a href="http://www.spykee-robot.com/">Spykee</a>-roboter, for test og
+leking. Kjøpte to da det var så billige, og gir meg mulighet til å
+eksperimentere uten å være veldig redd for å ødelegge alt ved å bytte
+ut firmware og slikt. Oppdaget at lekebutikken på Bryn senter hadde
+en liten stabel på lager som de ikke hadde klart å selge ut etter
+fjorårets juleinnkjøp, og var villig til å selge for en femtedel av
+vanlig pris. Jeg, Ronny og Jarle har skaffet oss restbeholdningen, og
+det blir morsomt å se hva vi får ut av dette.</p>
+
+<p>Roboten har belter styrt av to motorer, kamera, høytaler, mikrofon
+og wifi-tilkobling. Det hele styrt av en GPL-lisensiert databoks som
+jeg mistenker kjører linux. Firmware-kildekoden ble visst publisert i
+mai. Eneste utfordringen er at kontroller-programvaren kun finnes til
+Windows, men det må en kunne jobbe seg rundt når vi har kildekoden til
+firmwaren. :)</p>
+
+<ul>
+<li><a href="http://en.wikipedia.org/wiki/Spykee">Wikipedia-oppføring</a></li>
+<li><a href=http://www.spykeeworld.com/spykee/US/freeSoftware.html">Nedlasting av firmware-kilden</a></li>
+<li><a href="http://wiki.nuug.no/grupper/robot">prosjektwiki hos NUUG</a></li>
+</ul>
</description>
</item>
projects / homepage.git / blobdiff