<atom:link href="http://people.skolelinux.org/pere/blog/index.rss" rel="self" type="application/rss+xml" />
<item>
- <title>Idea for storing LTSP configuration in LDAP</title>
- <link>http://people.skolelinux.org/pere/blog/Idea_for_storing_LTSP_configuration_in_LDAP.html</link>
- <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Idea_for_storing_LTSP_configuration_in_LDAP.html</guid>
- <pubDate>Sun, 11 Jul 2010 22:00:00 +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>Vagrant mentioned on IRC today that ltsp_config now support
-sourcing files from /usr/share/ltsp/ltsp_config.d/ on the thin
-clients, and that this can be used to fetch configuration from LDAP if
-Debian Edu choose to store configuration there.</p>
-
-<p>Armed with this information, I got inspired and wrote a test module
-to get configuration from LDAP. The idea is to look up the MAC
-address of the client in LDAP, and look for attributes on the form
-ltspconfigsetting=value, and use this to export SETTING=value to the
-LTSP clients.</p>
-
-<p>The goal is to be able to store the LTSP configuration attributes
-in a "computer" LDAP object used by both DNS and DHCP, and thus
-allowing us to store all information about a computer in one place.</p>
-
-<p>This is a untested draft implementation, and I welcome feedback on
-this approach. A real LDAP schema for the ltspClientAux objectclass
-need to be written. Comments, suggestions, etc?</p>
-
-<blockquote><pre>
-# Store in /opt/ltsp/$arch/usr/share/ltsp/ltsp_config.d/ldap-config
-#
-# Fetch LTSP client settings from LDAP based on MAC address
-#
-# Uses ethernet address as stored in the dhcpHost objectclass using
-# the dhcpHWAddress attribute or ethernet address stored in the
-# ieee802Device objectclass with the macAddress attribute.
-#
-# This module is written to be schema agnostic, and only depend on the
-# existence of attribute names.
-#
-# The LTSP configuration variables are saved directly using a
-# ltspConfig prefix and uppercasing the rest of the attribute name.
-# To set the SERVER variable, set the ltspConfigServer attribute.
-#
-# Some LDAP schema should be created with all the relevant
-# configuration settings. Something like this should work:
-#
-# objectclass ( 1.1.2.2 NAME 'ltspClientAux'
-# SUP top
-# AUXILIARY
-# MAY ( ltspConfigServer $ ltsConfigSound $ ... )
-
-LDAPSERVER=$(debian-edu-ldapserver)
-if [ "$LDAPSERVER" ] ; then
- LDAPBASE=$(debian-edu-ldapserver -b)
- for MAC in $(LANG=C ifconfig |grep -i hwaddr| awk '{print $5}'|sort -u) ; do
- filter="(|(dhcpHWAddress=ethernet $MAC)(macAddress=$MAC))"
- ldapsearch -h "$LDAPSERVER" -b "$LDAPBASE" -v -x "$filter" | \
- grep '^ltspConfig' | while read attr value ; do
- # Remove prefix and convert to upper case
- attr=$(echo $attr | sed 's/^ltspConfig//i' | tr a-z A-Z)
- # bass value on to clients
- eval "$attr=$value; export $attr"
- done
- done
-fi
-</pre></blockquote>
-
-<p>I'm not sure this shell construction will work, because I suspect
-the while block might end up in a subshell causing the variables set
-there to not show up in ltsp-config, but if that is the case I am sure
-the code can be restructured to make sure the variables are passed on.
-I expect that can be solved with some testing. :)</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>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>jXplorer, a very nice LDAP GUI</title>
- <link>http://people.skolelinux.org/pere/blog/jXplorer__a_very_nice_LDAP_GUI.html</link>
- <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/jXplorer__a_very_nice_LDAP_GUI.html</guid>
- <pubDate>Fri, 9 Jul 2010 12:55:00 +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>Since
-<a href="http://people.skolelinux.org/pere/blog/LUMA__a_very_nice_LDAP_GUI.html">my
-last post</a> about available LDAP tools in Debian, I was told about a
-LDAP GUI that is even better than luma. The java application
-<a href="http://jxplorer.org/">jXplorer</a> is claimed to be capable of
-moving LDAP objects and subtrees using drag-and-drop, and can
-authenticate using Kerberos. I have only tested the Kerberos
-authentication, but do not have a LDAP setup allowing me to rewrite
-LDAP with my test user yet. It is
-<a href="http://packages.qa.debian.org/j/jxplorer.html">available in
-Debian</a> testing and unstable at the moment. The only problem I
-have with it is how it handle errors. If something go wrong, its
-non-intuitive behaviour require me to go through some query work list
-and remove the failing query. Nothing big, but very annoying.</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>MS Word krøller det til for politiet?</title>
- <link>http://people.skolelinux.org/pere/blog/MS_Word_kr__ller_det_til_for_politiet_.html</link>
- <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/MS_Word_kr__ller_det_til_for_politiet_.html</guid>
- <pubDate>Thu, 8 Jul 2010 14:00:00 +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>De siste dagene har Aftenposten
-<a href="http://www.aftenposten.no/nyheter/iriks/article3718597.ece">fortalt</a>
-<a href="http://www.aftenposten.no/nyheter/iriks/article3724249.ece">hvordan</a>
-politet har brukt skriveverktøy som ikke håndterer arabisk tekst og
-tekst som skal skrives fra høyre mot venstre når de har laget
-løpeseddel for å be om informasjon fra publikum. Resultatet har vært
-en uleselig arabisk-bit på løpeseddelen. Feilen har oppstått når
-teksten har blitt "kopiert inn i programvare som ikke har støtte for
-språk som skrives fra høyre mot venstre", og jeg er ganske sikker på
-at det er snakk om Microsoft Office i dette tilfellet. Er det slik at
-MS Office i norsk språkdrakt ikke har støtte for tekst som skal
-skrives fra høyre mot venstre? Jeg tror alle utgaver av
-OpenOffice.org har slik støtte, og det er jo ikke veldig vanskelig å
-la slik støtte finnes i alle utgaver av et program hvis støtten først
-er utviklet. Aftenpostens melding får meg til å undre om problemet
-ville vært unngått hvis politiet brukte OpenOffice.org i stedet for MS
-Office.</p>
-
-<p>Mon tro om det er flere eksempler på at MS Office har ødelagt for
-offentlig myndighet?</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>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>
+ <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>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.
+<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>
+% ln foo bar
+ln: creating hard link `bar' => `foo': Function not implemented
+%
+</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>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>Caching password, user and group on a roaming Debian laptop</title>
- <link>http://people.skolelinux.org/pere/blog/Caching_password__user_and_group_on_a_roaming_Debian_laptop.html</link>
- <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Caching_password__user_and_group_on_a_roaming_Debian_laptop.html</guid>
- <pubDate>Thu, 1 Jul 2010 11:40:00 +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>For a laptop, centralized user directories and password checking is
-a bit troubling. Laptops are typically used also when not connected
-to the network, and it is vital for a user to be able to log in or
-unlock the screen saver also when a central server is unavailable.
-This is possible by caching passwords and directory information (user
-and group attributes) locally, and the packages to do so are available
-in Debian. Here follow two recipes to set this up in Debian/Squeeze.
-It is also possible to set up in Debian/Lenny, but require more manual
-setup there because pam-auth-update is missing in Lenny.</p>
-
-<h2>LDAP/Kerberos + nscd + libpam-ccreds + libpam-mklocaluser/pam_mkhomedir</h2>
-
-This is the traditional method with a twist. The password caching is
-provided by libpam-ccreds (version 10-4 or later is needed on
-Squeeze), and the directory caching is done by nscd. The directory
-lookup and password checking is done using LDAP. If one want to use
-Kerberos for password checking the libpam-ldapd package can be
-replaced with libpam-krb5 or libpam-heimdal. If one is happy having a
-local home directory with the path listed in LDAP, one can use the
-pam_mkhomedir module from pam-modules to make this happen instead of
-using libpam-mklocaluser. A setup for pam-auth-update to enable
-pam_mkhomedir will have to be written until a fix for
-<a href="http://bugs.debian.org/568577">bug #568577</a> is in the
-archive. Because I believe it is a bad idea to have local home
-directories using misleading paths like /site/server/partition/, I
-prefer to create a local user with the home directory in /home/. This
-is done using the libpam-mklocaluser package.</p>
-
-<p>These packages need to be installed and configured</p>
-
-<blockquote><pre>
-libnss-ldapd libpam-ldapd nscd libpam-ccreds libpam-mklocaluser
-</pre></blockquote>
-
-<p>The ldapd packages will ask for LDAP connection information, and
-one have to fill in the values that fits ones own site. Make sure the
-PAM part uses encrypted connections, to make sure the password is not
-sent in clear text to the LDAP server. I've been unable to get TLS
-certificate checking for a self signed certificate working, which make
-LDAP authentication unsafe for Debian Edu (nslcd is not checking if it
-is talking to the correct LDAP server), and very much welcome feedback
-on how to get this working.</p>
-
-<p>Because nscd do not have a default configuration fit for offline
-caching until <a href="http://bugs.debian.org/485282">bug #485282</a>
-is fixed, this configuration should be used instead of the one
-currently in /etc/nscd.conf. The changes are in the fields
-reload-count and positive-time-to-live, and is based on the
-instructions I found in the
-<a href="http://www.flyn.org/laptopldap/">LDAP for Mobile Laptops</a>
-instructions by Flyn Computing.</p>
-
-<blockquote><pre>
- debug-level 0
- reload-count unlimited
- paranoia no
-
- enable-cache passwd yes
- positive-time-to-live passwd 2592000
- negative-time-to-live passwd 20
- suggested-size passwd 211
- check-files passwd yes
- persistent passwd yes
- shared passwd yes
- max-db-size passwd 33554432
- auto-propagate passwd yes
-
- enable-cache group yes
- positive-time-to-live group 2592000
- negative-time-to-live group 20
- suggested-size group 211
- check-files group yes
- persistent group yes
- shared group yes
- max-db-size group 33554432
- auto-propagate group yes
-
- enable-cache hosts no
- positive-time-to-live hosts 2592000
- negative-time-to-live hosts 20
- suggested-size hosts 211
- check-files hosts yes
- persistent hosts yes
- shared hosts yes
- max-db-size hosts 33554432
-
- enable-cache services yes
- positive-time-to-live services 2592000
- negative-time-to-live services 20
- suggested-size services 211
- check-files services yes
- persistent services yes
- shared services yes
- max-db-size services 33554432
-</pre></blockquote>
-
-<p>While we wait for a mechanism to update /etc/nsswitch.conf
-automatically like the one provided in
-<a href="http://bugs.debian.org/496915">bug #496915</a>, the file
-content need to be manually replaced to ensure LDAP is used as the
-directory service on the machine. /etc/nsswitch.conf should normally
-look like this:</p>
-
-<blockquote><pre>
-passwd: files ldap
-group: files ldap
-shadow: files ldap
-hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4
-networks: files
-protocols: files
-services: files
-ethers: files
-rpc: files
-netgroup: files ldap
-</pre></blockquote>
-
-<p>The important parts are that ldap is listed last for passwd, group,
-shadow and netgroup.</p>
-
-<p>With these changes in place, any user in LDAP will be able to log
-in locally on the machine using for example kdm, get a local home
-directory created and have the password as well as user and group
-attributes cached.
-
-<h2>LDAP/Kerberos + nss-updatedb + libpam-ccreds +
- libpam-mklocaluser/pam_mkhomedir</h2>
-
-<p>Because nscd have had its share of problems, and seem to have
-problems doing proper caching, I've seen suggestions and recipes to
-use nss-updatedb to copy parts of the LDAP database locally when the
-LDAP database is available. I have not tested such setup, because I
-discovered sssd.</p>
-
-<h2>LDAP/Kerberos + sssd + libpam-mklocaluser</h2>
-
-<p>A more flexible and robust setup than the nscd combination
-mentioned earlier that has shown up recently, is the
-<a href="https://fedorahosted.org/sssd/">sssd</a> package from Redhat.
-It is part of the <a href="http://www.freeipa.org/">FreeIPA</A> project
-to provide a Active Directory like directory service for Linux
-machines. The sssd system combines the caching of passwords and user
-information into one package, and remove the need for nscd and
-libpam-ccreds. It support LDAP and Kerberos, but not NIS. Version
-1.2 do not support netgroups, but it is said that it will support this
-in version 1.5 expected to show up later in 2010. Because the
-<a href="http://packages.qa.debian.org/s/sssd.html">sssd package</a>
-was missing in Debian, I ended up co-maintaining it with Werner, and
-version 1.2 is now in testing.
-
-<p>These packages need to be installed and configured to get the
-roaming setup I want</p>
-
-<blockquote><pre>
-libpam-sss libnss-sss libpam-mklocaluser
-</pre></blockquote>
-
-The complete setup of sssd is done by editing/creating
-<tt>/etc/sssd/sssd.conf</tt>.
-
-<blockquote><pre>
-[sssd]
-config_file_version = 2
-reconnection_retries = 3
-sbus_timeout = 30
-services = nss, pam
-domains = INTERN
-
-[nss]
-filter_groups = root
-filter_users = root
-reconnection_retries = 3
-
-[pam]
-reconnection_retries = 3
-
-[domain/INTERN]
-enumerate = false
-cache_credentials = true
-
-id_provider = ldap
-auth_provider = ldap
-chpass_provider = ldap
-
-ldap_uri = ldap://ldap
-ldap_search_base = dc=skole,dc=skolelinux,dc=no
-ldap_tls_reqcert = never
-ldap_tls_cacert = /etc/ssl/certs/ca-certificates.crt
-</pre></blockquote>
-
-<p>I got the same problem here with certificate checking. Had to set
-"ldap_tls_reqcert = never" to get it working.</p>
-
-<p>With the libnss-sss package in testing at the moment, the
-nsswitch.conf file is update automatically, so there is no need to
-modify it manually.</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>LUMA, a very nice LDAP GUI</title>
- <link>http://people.skolelinux.org/pere/blog/LUMA__a_very_nice_LDAP_GUI.html</link>
- <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/LUMA__a_very_nice_LDAP_GUI.html</guid>
- <pubDate>Mon, 28 Jun 2010 00:30:00 +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>The last few days I have been looking into the status of the LDAP
-directory in Debian Edu, and in the process I started to miss a GUI
-tool to browse the LDAP tree. The only one I was able to find in
-Debian/Squeeze and Lenny is
-<a href="http://luma.sourceforge.net/">LUMA</a>, which has proved to
-be a great tool to get a overview of the current LDAP directory
-populated by default in Skolelinux. Thanks to it, I have been able to
-find empty and obsolete subtrees, misplaced objects and duplicate
-objects. It will be installed by default in Debian/Squeeze. If you
-are working with LDAP, give it a go. :)</p>
-
-<p>I did notice one problem with it I have not had time to report to
-the BTS yet. There is no .desktop file in the package, so the tool do
-not show up in the Gnome and KDE menus, but only deep down in in the
-Debian submenu in KDE. I hope that can be fixed before Squeeze is
-released.</p>
-
-<p>I have not yet been able to get it to modify the tree yet. I would
-like to move objects and remove subtrees directly in the GUI, but have
-not found a way to do that with LUMA yet. So in the mean time, I use
-<a href="http://www.lichteblau.com/ldapvi/">ldapvi</a> for that.</p>
-
-<p>If you have tips on other GUI tools for LDAP that might be useful
-in Debian Edu, please contact us on debian-edu@lists.debian.org.</p>
-
-<p>Update 2010-06-29: Ross Reedstrom tipped us about the
-<a href="http://packages.qa.debian.org/g/gq.html">gq</a> package as a
-useful GUI alternative. It seem like a good tool, but is unmaintained
-in Debian and got a RC bug keeping it out of Squeeze. Unless that
-changes, it will not be an option for Debian Edu based on Squeeze.</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>Idea for a change to LDAP schemas allowing DNS and DHCP info to be combined into one object</title>
- <link>http://people.skolelinux.org/pere/blog/Idea_for_a_change_to_LDAP_schemas_allowing_DNS_and_DHCP_info_to_be_combined_into_one_object.html</link>
- <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Idea_for_a_change_to_LDAP_schemas_allowing_DNS_and_DHCP_info_to_be_combined_into_one_object.html</guid>
- <pubDate>Thu, 24 Jun 2010 00:35:00 +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>A while back, I
-<a href="http://people.skolelinux.org/pere/blog/Time_for_new__LDAP_schemas_replacing_RFC_2307_.html">complained
-about the fact</a> that it is not possible with the provided schemas
-for storing DNS and DHCP information in LDAP to combine the two sets
-of information into one LDAP object representing a computer.</p>
-
-<p>In the mean time, I discovered that a simple fix would be to make
-the dhcpHost object class auxiliary, to allow it to be combined with
-the dNSDomain object class, and thus forming one object for one
-computer when storing both DHCP and DNS information in LDAP.</p>
-
-<p>If I understand this correctly, it is not safe to do this change
-without also changing the assigned number for the object class, and I
-do not know enough about LDAP schema design to do that properly for
-Debian Edu.</p>
-
-<p>Anyway, for future reference, this is how I believe we could change
-the
-<a href="http://tools.ietf.org/html/draft-ietf-dhc-ldap-schema-00">DHCP
-schema</a> to solve at least part of the problem with the LDAP schemas
-available today from IETF.</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>
---- dhcp.schema (revision 65192)
-+++ dhcp.schema (working copy)
-@@ -376,7 +376,7 @@
- objectclass ( 2.16.840.1.113719.1.203.6.6
- NAME 'dhcpHost'
- DESC 'This represents information about a particular client'
-- SUP top
-+ SUP top AUXILIARY
- MUST cn
- MAY (dhcpLeaseDN $ dhcpHWAddress $ dhcpOptionsDN $ dhcpStatements $ dhcpComments $ dhcpOption)
- X-NDS_CONTAINMENT ('dhcpService' 'dhcpSubnet' 'dhcpGroup') )
+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>I very much welcome clues on how to do this properly for Debian
-Edu/Squeeze. We provide the DHCP schema in our debian-edu-config
-package, and should thus be free to rewrite it as we see fit.</p>
+<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>If you want to help out with implementing this for Debian Edu,
-please contact us on debian-edu@lists.debian.org.</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>Calling tasksel like the installer, while still getting useful output</title>
- <link>http://people.skolelinux.org/pere/blog/Calling_tasksel_like_the_installer__while_still_getting_useful_output.html</link>
- <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Calling_tasksel_like_the_installer__while_still_getting_useful_output.html</guid>
- <pubDate>Wed, 16 Jun 2010 14:55:00 +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>A few times I have had the need to simulate the way tasksel
-installs packages during the normal debian-installer run. Until now,
-I have ended up letting tasksel do the work, with the annoying problem
-of not getting any feedback at all when something fails (like a
-conffile question from dpkg or a download that fails), using code like
-this:
-
-<blockquote><pre>
-export DEBIAN_FRONTEND=noninteractive
-tasksel --new-install
-</pre></blockquote>
-
-This would invoke tasksel, let its automatic task selection pick the
-tasks to install, and continue to install the requested tasks without
-any output what so ever.
-
-Recently I revisited this problem while working on the automatic
-package upgrade testing, because tasksel would some times hang without
-any useful feedback, and I want to see what is going on when it
-happen. Then it occured to me, I can parse the output from tasksel
-when asked to run in test mode, and use that aptitude command line
-printed by tasksel then to simulate the tasksel run. I ended up using
-code like this:
-
-<blockquote><pre>
-export DEBIAN_FRONTEND=noninteractive
-cmd="$(in_target tasksel -t --new-install | sed 's/debconf-apt-progress -- //')"
-$cmd
-</pre></blockquote>
-
-<p>The content of $cmd is typically something like "<tt>aptitude -q
---without-recommends -o APT::Install-Recommends=no -y install
-~t^desktop$ ~t^gnome-desktop$ ~t^laptop$ ~pstandard ~prequired
-~pimportant</tt>", which will install the gnome desktop task, the
-laptop task and all packages with priority standard , required and
-important, just like tasksel would have done it during
-installation.</p>
-
-<p>A better approach is probably to extend tasksel to be able to
-install packages without using debconf-apt-progress, for use cases
-like this.</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>Vinmonopolet bryter loven åpenlyst - og flere planlegger å gjøre det samme</title>
- <link>http://people.skolelinux.org/pere/blog/Vinmonopolet_bryter_loven___penlyst___og_flere_planlegger____gj__re_det_samme.html</link>
- <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Vinmonopolet_bryter_loven___penlyst___og_flere_planlegger____gj__re_det_samme.html</guid>
- <pubDate>Wed, 16 Jun 2010 11:00:00 +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><a href="http://www.dagbladet.no/2010/06/16/nyheter/innenriks/streik/arbeidsliv/12157858/">Dagbladet
-melder</a> at Vinmonopolet med bakgrunn i vekterstreiken som pågår i
-Norge for tiden, har bestemt seg for med vitende og vilje å bryte
-sentralbanklovens paragraf 14 ved å nekte folk å betale med
-kontanter, og at flere butikker planlegger å følge deres eksempel.
-Jeg synes det er hårreisende hvis de slipper unna med et slikt
-soleklart lovbrudd, og lurer på hva slags muligheter jeg vil ha hvis
-jeg blir nektet å handle med kontanter. Jeg handler i hovedsak med
-kontanter selv, da jeg anser det som en borgerrett å kunne handle
-anonymt uten at det blir registrert. For meg er det et angrep på mitt
-personvern å nekte å ta imot kontant betaling.</p>
-
-<p><a href="http://www.lovdata.no/all/tl-19850524-028-003.html#14">Paragrafen
-i sentralbankloven</a> lyder:</p>
-
-<blockquote>
-<p>§ 14. Tvungent betalingsmiddel</p>
-
-<p>Bankens sedler og mynter er tvungent betalingsmiddel i Norge. Ingen
-er pliktig til i én betaling å ta imot mer enn femogtyve mynter av
-hver enhet.</p>
-
-<p>Sterkt skadde sedler og mynter er ikke tvungent
-betalingsmiddel. Banken gir nærmere forskrifter om erstatning for
-bortkomne, brente eller skadde sedler og mynter.</p>
-
-<p>Selv om en avtale inneholder klausul om betaling av en
-pengeforpliktelse i gullverdi, kan skyldneren frigjøre seg med tvungne
-betalingsmidler uten hensyn til denne klausul.</p>
-</blockquote>
-
-<p>Det er med bakgrunn i denne lovet ikke tillatt å nekte å ta imot
-kontakt betaling. Det er en lov jeg har sans for, og som jeg mener må
-håndheves strengt.</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>Officeshots taking shape</title>
- <link>http://people.skolelinux.org/pere/blog/Officeshots_taking_shape.html</link>
- <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Officeshots_taking_shape.html</guid>
- <pubDate>Sun, 13 Jun 2010 11:40:00 +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>For those of us caring about document exchange and
-interoperability, <a href="http://www.officeshots.org/">OfficeShots</a>
-is a great service. It is to ODF documents what
-<a href="http://browsershots.org/">BrowserShots</a> is for web
-pages.</p>
-
-<p>A while back, I was contacted by Knut Yrvin at the part of Nokia
-that used to be Trolltech, who wanted to help the OfficeShots project
-and wondered if the University of Oslo where I work would be
-interested in supporting the project. I helped him to navigate his
-request to the right people at work, and his request was answered with
-a spot in the machine room with power and network connected, and Knut
-arranged funding for a machine to fill the spot. The machine is
-administrated by the OfficeShots people, so I do not have daily
-contact with its progress, and thus from time to time check back to
-see how the project is doing.</p>
-
-<p>Today I had a look, and was happy to see that the Dell box in our
-machine room now is the host for several virtual machines running as
-OfficeShots factories, and the project is able to render ODF documents
-in 17 different document processing implementation on Linux and
-Windows. This is great.</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