+ <div class="entry">
+ <div class="title"><a href="http://people.skolelinux.org/pere/blog/Debian_now_with_ZFS_on_Linux_included.html">Debian now with ZFS on Linux included</a></div>
+ <div class="date">12th May 2016</div>
+ <div class="body"><p>Today, after many years of hard work from many people,
+<a href="http://zfsonlinux.org/">ZFS for Linux</a> finally entered
+Debian. The package status can be seen on
+<a href="https://tracker.debian.org/pkg/zfs-linux">the package tracker
+for zfs-linux</a>. and
+<a href="https://qa.debian.org/developer.php?login=pkg-zfsonlinux-devel@lists.alioth.debian.org">the
+team status page</a>. If you want to help out, please join us.
+<a href="http://anonscm.debian.org/gitweb/?p=pkg-zfsonlinux/zfs.git">The
+source code</a> is available via git on Alioth. It would also be
+great if you could help out with
+<a href="https://tracker.debian.org/pkg/dkms">the dkms package</a>, as
+it is an important piece of the puzzle to get ZFS working.</p>
+</div>
+ <div class="tags">
+
+
+ Tags: <a href="http://people.skolelinux.org/pere/blog/tags/debian">debian</a>, <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>.
+
+
+ </div>
+ </div>
+ <div class="padding"></div>
+
+ <div class="entry">
+ <div class="title"><a href="http://people.skolelinux.org/pere/blog/What_is_the_best_multimedia_player_in_Debian_.html">What is the best multimedia player in Debian?</a></div>
+ <div class="date"> 8th May 2016</div>
+ <div class="body"><p><strong>Where I set out to figure out which multimedia player in
+Debian claim support for most file formats.</strong></p>
+
+<p>A few years ago, I had a look at the media support for Browser
+plugins in Debian, to get an idea which plugins to include in Debian
+Edu. I created a script to extract the set of supported MIME types
+for each plugin, and used this to find out which multimedia browser
+plugin supported most file formats / media types.
+<a href="https://wiki.debian.org/DebianEdu/BrowserMultimedia">The
+result</a> can still be seen on the Debian wiki, even though it have
+not been updated for a while. But browser plugins are less relevant
+these days, so I thought it was time to look at standalone
+players.</p>
+
+<p>A few days ago I was tired of VLC not being listed as a viable
+player when I wanted to play videos from the Norwegian National
+Broadcasting Company, and decided to investigate why. The cause is a
+<a href="https://bugs.debian.org/822245">missing MIME type in the VLC
+desktop file</a>. In the process I wrote a script to compare the set
+of MIME types announced in the desktop file and the browser plugin,
+only to discover that there is quite a large difference between the
+two for VLC. This discovery made me dig up the script I used to
+compare browser plugins, and adjust it to compare desktop files
+instead, to try to figure out which multimedia player in Debian
+support most file formats.</p>
+
+<p>The result can be seen on the Debian Wiki, as
+<a href="https://wiki.debian.org/DebianMultimedia/PlayerSupport">a
+table listing all MIME types supported by one of the packages included
+in the table</a>, with the package supporting most MIME types being
+listed first in the table.</p>
+
+</p>The best multimedia player in Debian? It is totem, followed by
+parole, kplayer, mpv, vlc, smplayer mplayer-gui gnome-mpv and
+kmplayer. Time for the other players to update their announced MIME
+support?</p>
+</div>
+ <div class="tags">
+
+
+ Tags: <a href="http://people.skolelinux.org/pere/blog/tags/debian">debian</a>, <a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu</a>, <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia</a>, <a href="http://people.skolelinux.org/pere/blog/tags/video">video</a>.
+
+
+ </div>
+ </div>
+ <div class="padding"></div>
+
<div class="entry">
<div class="title"><a href="http://people.skolelinux.org/pere/blog/The_Pyra___handheld_computer_with_Debian_preinstalled.html">The Pyra - handheld computer with Debian preinstalled</a></div>
<div class="date"> 4th May 2016</div>
</div>
<div class="padding"></div>
- <div class="entry">
- <div class="title"><a href="http://people.skolelinux.org/pere/blog/syslog_trusted_timestamp___chain_of_trusted_timestamps_for_your_syslog.html">syslog-trusted-timestamp - chain of trusted timestamps for your syslog</a></div>
- <div class="date"> 2nd April 2016</div>
- <div class="body"><p>Two years ago, I had
-<a href="http://people.skolelinux.org/pere/blog/Public_Trusted_Timestamping_services_for_everyone.html">a
-look at trusted timestamping options available</a>, and among
-other things noted a still open
-<a href="https://bugs.debian.org/742553">bug in the tsget script</a>
-included in openssl that made it harder than necessary to use openssl
-as a trusted timestamping client. A few days ago I was told
-<a href="https:/www.difi.no/">the Norwegian government office DIFI</a> is
-close to releasing their own trusted timestamp service, and in the
-process I was happy to learn about a replacement for the tsget script
-using only curl:</p>
-
-<p><pre>
-openssl ts -query -data "/etc/shells" -cert -sha256 -no_nonce \
- | curl -s -H "Content-Type: application/timestamp-query" \
- --data-binary "@-" http://zeitstempel.dfn.de > etc-shells.tsr
-openssl ts -reply -text -in etc-shells.tsr
-</pre></p>
-
-<p>This produces a binary timestamp file (etc-shells.tsr) which can be
-used to verify that the content of the file /etc/shell with the
-calculated sha256 hash existed at the point in time when the request
-was made. The last command extract the content of the etc-shells.tsr
-in human readable form. The idea behind such timestamp is to be able
-to prove using cryptography that the content of a file have not
-changed since the file was stamped.</p>
-
-<p>To verify that the file on disk match the public key signature in
-the timestamp file, run the following commands. It make sure you have
-the required certificate for the trusted timestamp service available
-and use it to compare the file content with the timestamp. In
-production, one should of course use a better method to verify the
-service certificate.</p>
-
-<p><pre>
-wget -O ca-cert.txt https://pki.pca.dfn.de/global-services-ca/pub/cacert/chain.txt
-openssl ts -verify -data /etc/shells -in etc-shells.tsr -CAfile ca-cert.txt -text
-</pre></p>
-
-<p>Wikipedia have a lot more information about
-<a href="https://en.wikipedia.org/wiki/Trusted_timestamping">trusted
-Timestamping</a> and
-<a href="https://en.wikipedia.org/wiki/Linked_timestamping">linked
-timestamping</a>, and there are several trusted timestamping services
-around, both as commercial services and as free and public services.
-Among the latter is
-<a href="https://www.pki.dfn.de/zeitstempeldienst/">the
-zeitstempel.dfn.de service</a> mentioned above and
-<a href="https://freetsa.org/">freetsa.org service</a> linked to from the
-wikipedia web site. I believe the DIFI service should show up on
-https://tsa.difi.no, but it is not available to the public at the
-moment. I hope this will change when it is into production. The
-<a href="https://tools.ietf.org/html/rfc3161">RFC 3161</a> trusted
-timestamping protocol standard is even implemented in LibreOffice,
-Microsoft Office and Adobe Acrobat, making it possible to verify when
-a document was created.</p>
-
-<p>I would find it useful to be able to use such trusted timestamp
-service to make it possible to verify that my stored syslog files have
-not been tampered with. This is not a new idea. I found one example
-implemented on the Endian network appliances where
-<a href="http://help.endian.com/entries/21518508-Enabling-Timestamping-on-log-files-">the
-configuration of such feature was described in 2012</a>.</p>
-
-<p>But I could not find any free implementation of such feature when I
-searched, so I decided to try to
-<a href="https://github.com/petterreinholdtsen/syslog-trusted-timestamp">build
-a prototype named syslog-trusted-timestamp</a>. My idea is to
-generate a timestamp of the old log files after they are rotated, and
-store the timestamp in the new log file just after rotation. This
-will form a chain that would make it possible to see if any old log
-files are tampered with. But syslog is bad at handling kilobytes of
-binary data, so I decided to base64 encode the timestamp and add an ID
-and line sequence numbers to the base64 data to make it possible to
-reassemble the timestamp file again. To use it, simply run it like
-this:
-
-<p><pre>
-syslog-trusted-timestamp /path/to/list-of-log-files
-</pre></p>
-
-<p>This will send a timestamp from one or more timestamp services (not
-yet decided nor implemented) for each listed file to the syslog using
-logger(1). To verify the timestamp, the same program is used with the
---verify option:</p>
-
-<p><pre>
-syslog-trusted-timestamp --verify /path/to/log-file /path/to/log-with-timestamp
-</pre></p>
-
-<p>The verification step is not yet well designed. The current
-implementation depend on the file path being unique and unchanging,
-and this is not a solid assumption. It also uses process number as
-timestamp ID, and this is bound to create ID collisions. I hope to
-have time to come up with a better way to handle timestamp IDs and
-verification later.</p>
-
-<p>Please check out
-<a href="https://github.com/petterreinholdtsen/syslog-trusted-timestamp">the
-prototype for syslog-trusted-timestamp on github</a> and send
-suggestions and improvement, or let me know if there already exist a
-similar system for timestamping logs already to allow me to join
-forces with others with the same interest.</p>
-
-<p>As usual, if you use Bitcoin and want to show your support of my
-activities, please send Bitcoin donations to my address
-<b><a href="bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b</a></b>.</p>
-</div>
- <div class="tags">
-
-
- Tags: <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet</a>.
-
-
- </div>
- </div>
- <div class="padding"></div>
-
- <div class="entry">
- <div class="title"><a href="http://people.skolelinux.org/pere/blog/Full_battery_stats_collector_is_now_available_in_Debian.html">Full battery stats collector is now available in Debian</a></div>
- <div class="date">23rd March 2016</div>
- <div class="body"><p>Since this morning, the battery-stats package in Debian include an
-extended collector that will collect the complete battery history for
-later processing and graphing. The original collector store the
-battery level as percentage of last full level, while the new
-collector also record battery vendor, model, serial number, design
-full level, last full level and current battery level. This make it
-possible to predict the lifetime of the battery as well as visualise
-the energy flow when the battery is charging or discharging.</p>
-
-<p>The new tools are available in <tt>/usr/share/battery-stats/</tt>
-in the version 0.5.1 package in unstable. Get the new battery level graph
-and lifetime prediction by running:
-
-<p><pre>
-/usr/share/battery-stats/battery-stats-graph /var/log/battery-stats.csv
-</pre></p>
-
-<p>Or select the 'Battery Level Graph' from your application menu.</p>
-
-<p>The flow in/out of the battery can be seen by running (no menu
-entry yet):</p>
-
-<p><pre>
-/usr/share/battery-stats/battery-stats-graph-flow
-</pre></p>
-
-<p>I'm not quite happy with the way the data is visualised, at least
-when there are few data points. The graphs look a bit better with a
-few years of data.</p>
-
-<p>A while back one important feature I use in the battery stats
-collector broke in Debian. The scripts in
-<tt>/usr/lib/pm-utils/power.d/</tt> were no longer executed. I
-suspect it happened when Jessie started using systemd, but I do not
-know. The issue is reported as
-<a href="https://bugs.debian.org/818649">bug #818649</a> against
-pm-utils. I managed to work around it by adding an udev rule to call
-the collector script every time the power connector is connected and
-disconnected. With this fix in place it was finally time to make a
-new release of the package, and get it into Debian.</p>
-
-<p>If you are interested in how your laptop battery is doing, please
-check out the
-<a href="https://tracker.debian.org/pkg/battery-stats">battery-stats</a>
-in Debian unstable, or rebuild it on Jessie to get it working on
-Debian stable. :) The upstream source is available from
-<a href="https://github.com/petterreinholdtsen/battery-stats">github</a>.
-As always, patches are very welcome.</p>
-</div>
- <div class="tags">
-
-
- Tags: <a href="http://people.skolelinux.org/pere/blog/tags/debian">debian</a>, <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>.
-
-
- </div>
- </div>
- <div class="padding"></div>
-
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+<li><a href="http://people.skolelinux.org/pere/blog/archive/2016/05/">May (3)</a></li>
</ul></li>
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+ <li><a href="http://people.skolelinux.org/pere/blog/tags/debian">debian (127)</a></li>
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+ <li><a href="http://people.skolelinux.org/pere/blog/tags/english">english (314)</a></li>
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<li><a href="http://people.skolelinux.org/pere/blog/tags/mesh network">mesh network (8)</a></li>
- <li><a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (37)</a></li>
+ <li><a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (38)</a></li>
<li><a href="http://people.skolelinux.org/pere/blog/tags/nice free software">nice free software (7)</a></li>
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- <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (55)</a></li>
+ <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (56)</a></li>
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