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6 <title>Petter Reinholdtsen
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14 <a href=
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</a>
23 <div class=
"title"><a href=
"http://people.skolelinux.org/pere/blog/New_chrpath_release_0_15.html">New chrpath release
0.15</a></div>
24 <div class=
"date">24th November
2013</div>
25 <div class=
"body"><p>After many years break from the package and a vain hope that
26 development would be continued by someone else, I finally pulled my
27 acts together this morning and wrapped up a new release of chrpath,
28 the command line tool to modify the rpath and runpath of already
29 compiled ELF programs. The update was triggered by the persistence of
30 Isha Vishnoi at IBM, which needed a new config.guess file to get
31 support for the ppc64le architecture (powerpc
64-bit Little Endian) he
32 is working on. I checked the
33 <a href=
"http://packages.qa.debian.org/chrpath">Debian
</a>,
34 <a href=
"https://launchpad.net/ubuntu/+source/chrpath">Ubuntu
</a> and
35 <a href=
"https://admin.fedoraproject.org/pkgdb/acls/name/chrpath">Fedora
</a>
36 packages for interesting patches (failed to find the source from
37 OpenSUSE and Mandriva packages), and found quite a few nice fixes.
38 These are the release notes:
</p>
40 <p>New in
0.15 released
2013-
11-
24:
</p>
44 <li>Updated config.sub and config.guess from the GNU project to work
45 with newer architectures. Thanks to isha vishnoi for the heads
48 <li>Updated README with current URLs.
</li>
50 <li>Added byteswap fix found in Ubuntu, credited Jeremy Kerr and
53 <li>Added missing help for -k|--keepgoing option, using patch by
54 Petr Machata found in Fedora.
</li>
56 <li>Rewrite removal of RPATH/RUNPATH to make sure the entry in
57 .dynamic is a NULL terminated string. Based on patch found in
58 Fedora credited Axel Thimm and Christian Krause.
</li>
63 <a href=
"https://alioth.debian.org/frs/?group_id=31052">download the
64 new version
0.15 from alioth
</a>. Please let us know via the Alioth
65 project if something is wrong with the new release. The test suite
66 did not discover any old errors, so if you find a new one, please also
67 include a testsuite check.
</p>
72 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>.
77 <div class=
"padding"></div>
80 <div class=
"title"><a href=
"http://people.skolelinux.org/pere/blog/RSS_kilde_for_friteksts_k_i_offentlige_anbud_hos_Doffin.html">RSS-kilde for fritekstsøk i offentlige anbud hos Doffin
</a></div>
81 <div class=
"date">22nd November
2013</div>
82 <div class=
"body"><p>I fjor sommer lagde jeg en
83 <a href=
"http://people.skolelinux.org/pere/blog/SQL_database_med_anbud_publisert_p__Doffin.html">offentlig
84 tilgjengelig SQL-database over offentlig anbud
</a> basert på skraping
85 av HTML-data fra Doffin. Den har stått og gått siden da, og har nå
86 ca.
28000 oppføringer. Jeg oppdaget da jeg tittet innom at noen
87 oppføringer var ikke blitt med, antagelig på grunn av at de fikk
88 tildelt sekvensnummer i Doffin en godt stund før de ble publisert,
89 slik at min nettsideskraper som fortsatte skrapingen der den slapp
90 sist ikke fikk dem med seg. Jeg har fikset litt slik at skraperen nå
91 ser litt tilbake i tid for å se om den har gått glipp av noen
92 oppføringer, og har skrapet på nytt fra midten av september
2013 og
93 fremover. Det bør dermed bli en mer komplett database for kommende
94 måneder. Hvis jeg får tid skal jeg forsøke å skrape "glemte" data fra
95 før midten av september
2013, men tør ikke garantere at det blir
96 prioritert med det første.
</p>
98 <p>Men målet med denne bloggposten er å vise hvordan denne
99 Doffin-databasen kan brukes og integreres med en RSS-leser, slik at en
100 kan la datamaskinen holde et øye med Doffin-annonseringer etter
101 nøkkelord. En kan lage sitt eget søk ved å besøke
102 <ahref=
"https://classic.scraperwiki.com/docs/api?name=norwegian-doffin#sqlite">API-et
103 hos Scraperwiki
</a>, velge format rss2 og så legge inn noe ala dette i
107 select title, scrapedurl as link, abstract as description,
108 publishdate as pubDate from 'swdata'
109 where abstract like '%linux%' or title like '%linux%'
110 order by seq desc limit
20
113 <p>Dette vil søke opp alle anbud med ordet linux i oppsummering eller
114 tittel. En kan lage mer avanserte søk hvis en ønsker det. URL-en som
115 dukker opp nederst på siden kan en så gi til sin RSS-leser (jeg bruker
116 akregator selv), og så automatisk få beskjed hvis det dukker opp anbud
117 med det aktuelle nøkkelordet i teksten. Merk at kapasiteten og
118 ytelsen hos Scraperwiki er begrenset, så ikke be RSS-leseren hente ned
119 oftere enn en gang hver dag.
</p>
121 <p>Du lurer kanskje på hva slags informasjon en kan få ut fra denne
122 databasen. Her er to RSS-kilder, med søkeordet
123 "
<a href=
"https://api.scraperwiki.com/api/1.0/datastore/sqlite?format=rss2&name=norwegian-doffin&query=select%20title%2C%20scrapedurl%20as%20link%2C%20abstract%20as%20description%2C%0A%20%20%20%20%20%20%20publishdate%20as%20pubDate%20from%20'swdata'%0A%20%20%20where%20abstract%20like%20'%25linux%25'%20or%20title%20like%20'%25linux%25'%0A%20%20%20order%20by%20seq%20desc%20limit%2020">linux
</a>",
125 "<a href=
"https://api.scraperwiki.com/api/1.0/datastore/sqlite?format=rss2&name=norwegian-doffin&query=select%20title%2C%20scrapedurl%20as%20link%2C%20abstract%20as%20description%2C%0A%20%20%20%20%20%20%20publishdate%20as%20pubDate%20from%20'swdata'%0A%20%20%20where%20abstract%20like%20'%25fri%20programvare%25'%20or%20title%20like%20'%25fri%20programvare%25'%0A%20%20%20order%20by%20seq%20desc%20limit%2020">fri
128 "<a href=
"https://api.scraperwiki.com/api/1.0/datastore/sqlite?format=rss2&name=norwegian-doffin&query=select%20title%2C%20scrapedurl%20as%20link%2C%20abstract%20as%20description%2C%0A%20%20%20%20%20%20%20publishdate%20as%20pubDate%20from%20'swdata'%0A%20%20%20where%20abstract%20like%20'%25odf%25'%20or%20title%20like%20'%25odf%25'%0A%20%20%20order%20by%20seq%20desc%20limit%2020">odf
</a>".
129 Det er bare å søke på det en er interessert i. Kopier gjerne
130 datasettet og sett opp din egen tjeneste hvis du vil gjøre mer
131 avanserte søk. SQLite-filen med Doffin-oppføringer kan lastes med fra
132 Scraperwiki for de som vil grave dypere.</p>
137 Tags: <a href="http://people.skolelinux.org/pere/blog/tags/norsk
">norsk</a>, <a href="http://people.skolelinux.org/pere/blog/tags/nuug
">nuug</a>, <a href="http://people.skolelinux.org/pere/blog/tags/offentlig innsyn
">offentlig innsyn</a>.
142 <div class="padding
"></div>
145 <div class="title
"><a href="http://people.skolelinux.org/pere/blog/All_drones_should_be_radio_marked_with_what_they_do_and_who_they_belong_to.html
">All drones should be radio marked with what they do and who they belong to</a></div>
146 <div class="date
">21st November 2013</div>
147 <div class="body
"><p>Drones, flying robots, are getting more and more popular. The most
148 know ones are the killer drones used by some government to murder
149 people they do not like without giving them the chance of a fair
150 trial, but the technology have many good uses too, from mapping and
151 forest maintenance to photography and search and rescue. I am sure it
152 is just a question of time before "bad drones" are in the hands of
153 private enterprises and not only state criminals but petty criminals
154 too. The drone technology is very useful and very dangerous. To have
155 some control over the use of drones, I agree with Daniel Suarez in his
157 "
<a href=
"https://archive.org/details/DanielSuarez_2013G">The kill
158 decision shouldn't belong to a robot
</a>", where he suggested this
159 little gem to keep the good while limiting the bad use of drones:</p>
163 <p>Each robot and drone should have a cryptographically signed
164 I.D. burned in at the factory that can be used to track its movement
165 through public spaces. We have license plates on cars, tail numbers on
166 aircraft. This is no different. And every citizen should be able to
167 download an app that shows the population of drones and autonomous
168 vehicles moving through public spaces around them, both right now and
169 historically. And civic leaders should deploy sensors and civic drones
170 to detect rogue drones, and instead of sending killer drones of their
171 own up to shoot them down, they should notify humans to their
172 presence. And in certain very high-security areas, perhaps civic
173 drones would snare them and drag them off to a bomb disposal facility.</p>
175 <p>But notice, this is more an immune system than a weapons system. It
176 would allow us to avail ourselves of the use of autonomous vehicles
177 and drones while still preserving our open, civil society.</p>
181 <p>The key is that <em>every citizen</em> should be able to read the
182 radio beacons sent from the drones in the area, to be able to check
183 both the government and others use of drones. For such control to be
184 effective, everyone must be able to do it. What should such beacon
185 contain? At least formal owner, purpose, contact information and GPS
186 location. Probably also the origin and target position of the current
187 flight. And perhaps some registration number to be able to look up
188 the drone in a central database tracking their movement. Robots
189 should not have privacy. It is people who need privacy.</p>
194 Tags: <a href="http://people.skolelinux.org/pere/blog/tags/english
">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/robot
">robot</a>, <a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet
">sikkerhet</a>, <a href="http://people.skolelinux.org/pere/blog/tags/surveillance
">surveillance</a>.
199 <div class="padding
"></div>
202 <div class="title
"><a href="http://people.skolelinux.org/pere/blog/Lets_make_a_wireless_community_network_in_Oslo_.html
">Lets make a wireless community network in Oslo!</a></div>
203 <div class="date
">13th November 2013</div>
204 <div class="body
"><p>Today NUUG and Hackeriet announced
205 <a href="http://www.nuug.no/news/Bli_med___bygge_dugnadsnett_for_alle_i_Oslo.shtml
">our
206 plans to join forces and create a wireless community network in
207 Oslo</a>. The workshop to help people get started will take place
208 Thursday 2013-11-28, but we already are collecting the geolocation of
209 people joining forces to make this happen. We have
210 <a href="https://github.com/petterreinholdtsen/meshfx-node/blob/master/oslo-nodes.geojson
">9
211 locations plotted on the map</a>, but we will need more before we have
212 a connected mesh spread across Oslo. If this sound interesting to
213 you, please join us at the workshop. If you are too impatient to wait
214 15 days, please join us on the IRC channel
215 <a href="irc://irc.freenode.net/%
23nuug
">#nuug on irc.freenode.net</a>
221 Tags: <a href="http://people.skolelinux.org/pere/blog/tags/english
">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/mesh network
">mesh network</a>, <a href="http://people.skolelinux.org/pere/blog/tags/nuug
">nuug</a>.
226 <div class="padding
"></div>
229 <div class="title
"><a href="http://people.skolelinux.org/pere/blog/Running_TP_Link_MR3040_as_a_batman_adv_mesh_node_using_openwrt.html
">Running TP-Link MR3040 as a batman-adv mesh node using openwrt</a></div>
230 <div class="date
">10th November 2013</div>
231 <div class="body
"><p>Continuing my research into mesh networking, I was recommended to
232 use TP-Link 3040 and 3600 access points as mesh nodes, and the pair I
233 bought arrived on Friday. Here are my notes on how to set up the
234 MR3040 as a mesh node using
235 <a href="http://www.openwrt.org/
">OpenWrt</a>.</p>
237 <p>I started by following the instructions on the OpenWRT wiki for
238 <a href="http://wiki.openwrt.org/toh/tp-link/tl-mr3040
">TL-MR3040</a>,
240 <a href="http://downloads.openwrt.org/snapshots/trunk/ar71xx/openwrt-ar71xx-generic-tl-mr3040-v2-squashfs-factory.bin
">the
241 recommended firmware image</a>
242 (openwrt-ar71xx-generic-tl-mr3040-v2-squashfs-factory.bin) and
243 uploaded it into the original web interface. The flashing went fine,
244 and the machine was available via telnet on the ethernet port. After
245 logging in and setting the root password, ssh was available and I
246 could start to set it up as a batman-adv mesh node.</p>
248 <p>I started off by reading the instructions from
249 <a href="http://wirelessafrica.meraka.org.za/wiki/index.php?title=Antoine's_Research
">Wireless
250 Africa</a>, which had quite a lot of useful information, but
251 eventually I followed the recipe from the Open Mesh wiki for
252 <a href="http://www.open-mesh.org/projects/batman-adv/wiki/Batman-adv-openwrt-config
">using
253 batman-adv on OpenWrt</a>. A small snag was the fact that the
254 <tt>opkg install kmod-batman-adv</tt> command did not work as it
255 should. The batman-adv kernel module would fail to load because its
256 dependency crc16 was not already loaded. I
257 <a href="https://dev.openwrt.org/ticket/
14452">reported the bug</a> to
258 the openwrt project and hope it will be fixed soon. But the problem
259 only seem to affect initial testing of batman-adv, as configuration
260 seem to work when booting from scratch.</p>
262 <p>The setup is done using files in /etc/config/. I did not bridge
263 the Ethernet and mesh interfaces this time, to be able to hook up the
264 box on my local network and log into it for configuration updates.
265 The following files were changed and look like this after modifying
268 <p><tt>/etc/config/network</tt></p>
272 config interface 'loopback'
274 option proto 'static'
275 option ipaddr '127.0.0.1'
276 option netmask '255.0.0.0'
278 config globals 'globals'
279 option ula_prefix 'fdbf:4c12:3fed::/48'
281 config interface 'lan'
285 option ipaddr '192.168.1.1'
286 option netmask '255.255.255.0'
287 option hostname 'tl-mr3040'
288 option ip6assign '60'
290 config interface 'mesh'
291 option ifname 'adhoc0'
293 option proto 'batadv'
297 <p><tt>/etc/config/wireless</tt></p>
300 config wifi-device 'radio0'
301 option type 'mac80211'
304 option path 'platform/ar933x_wmac'
306 list ht_capab 'SHORT-GI-20'
307 list ht_capab 'SHORT-GI-40'
308 list ht_capab 'RX-STBC1'
309 list ht_capab 'DSSS_CCK-40'
312 config wifi-iface 'wmesh'
313 option device 'radio0'
314 option ifname 'adhoc0'
315 option network 'mesh'
316 option encryption 'none'
318 option bssid '02:BA:00:00:00:01'
319 option ssid 'meshfx@hackeriet'
321 <p><tt>/etc/config/batman-adv</tt></p>
325 option interfaces 'adhoc0'
326 option 'aggregated_ogms'
327 option 'ap_isolation'
329 option 'fragmentation'
330 option 'gw_bandwidth'
332 option 'gw_sel_class'
334 option 'orig_interval'
336 option 'bridge_loop_avoidance'
337 option 'distributed_arp_table'
338 option 'network_coding'
341 # yet another batX instance
342 # config 'mesh' 'bat5'
343 # option 'interfaces' 'second_mesh'
346 <p>The mesh node is now operational. I have yet to test its range,
347 but I hope it is good. I have not yet tested the TP-Link 3600 box
348 still wrapped up in plastic.</p>
353 Tags: <a href="http://people.skolelinux.org/pere/blog/tags/english
">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/mesh network
">mesh network</a>, <a href="http://people.skolelinux.org/pere/blog/tags/nuug
">nuug</a>.
358 <div class="padding
"></div>
361 <div class="title
"><a href="http://people.skolelinux.org/pere/blog/Debian_init_d_boot_script_example_for_rsyslog.html
">Debian init.d boot script example for rsyslog</a></div>
362 <div class="date
"> 2nd November 2013</div>
363 <div class="body
"><p>If one of the points of switching to a new init system in Debian is
364 <a href="http://thomas.goirand.fr/blog/?p=
147">to get rid of huge
365 init.d scripts</a>, I doubt we need to switch away from sysvinit and
366 init.d scripts at all. Here is an example init.d script, ie a rewrite
367 of /etc/init.d/rsyslog:</p>
370 #!/lib/init/init-d-script
373 # Required-Start: $remote_fs $time
374 # Required-Stop: umountnfs $time
375 # X-Stop-After: sendsigs
376 # Default-Start: 2 3 4 5
377 # Default-Stop: 0 1 6
378 # Short-Description: enhanced syslogd
379 # Description: Rsyslog is an enhanced multi-threaded syslogd.
380 # It is quite compatible to stock sysklogd and can be
381 # used as a drop-in replacement.
383 DESC="enhanced syslogd"
384 DAEMON=/usr/sbin/rsyslogd
387 <p>Pretty minimalistic to me... For the record, the original sysv-rc
388 script was
137 lines, and the above is just
15 lines, most of it meta
391 <p>How to do this, you ask? Well, one create a new script
392 /lib/init/init-d-script looking something like this:
397 # Define LSB log_* functions.
398 # Depend on lsb-base (
>=
3.2-
14) to ensure that this file is present
399 # and status_of_proc is working.
400 . /lib/lsb/init-functions
403 # Function that starts the daemon/service
409 #
0 if daemon has been started
410 #
1 if daemon was already running
411 #
2 if daemon could not be started
412 start-stop-daemon --start --quiet --pidfile $PIDFILE --exec $DAEMON --test
> /dev/null \
414 start-stop-daemon --start --quiet --pidfile $PIDFILE --exec $DAEMON -- \
417 # Add code here, if necessary, that waits for the process to be ready
418 # to handle requests from services started subsequently which depend
419 # on this one. As a last resort, sleep for some time.
423 # Function that stops the daemon/service
428 #
0 if daemon has been stopped
429 #
1 if daemon was already stopped
430 #
2 if daemon could not be stopped
431 # other if a failure occurred
432 start-stop-daemon --stop --quiet --retry=TERM/
30/KILL/
5 --pidfile $PIDFILE --name $NAME
434 [ "$RETVAL" =
2 ] && return
2
435 # Wait for children to finish too if this is a daemon that forks
436 # and if the daemon is only ever run from this initscript.
437 # If the above conditions are not satisfied then add some other code
438 # that waits for the process to drop all resources that could be
439 # needed by services started subsequently. A last resort is to
440 # sleep for some time.
441 start-stop-daemon --stop --quiet --oknodo --retry=
0/
30/KILL/
5 --exec $DAEMON
442 [ "$?" =
2 ] && return
2
443 # Many daemons don't delete their pidfiles when they exit.
449 # Function that sends a SIGHUP to the daemon/service
453 # If the daemon can reload its configuration without
454 # restarting (for example, when it is sent a SIGHUP),
455 # then implement that here.
457 start-stop-daemon --stop --signal
1 --quiet --pidfile $PIDFILE --name $NAME
462 scriptbasename="$(basename $
1)"
463 echo "SN: $scriptbasename"
464 if [ "$scriptbasename" != "init-d-library" ] ; then
472 NAME=$(basename $DAEMON)
473 PIDFILE=/var/run/$NAME.pid
475 # Exit if the package is not installed
476 #[ -x "$DAEMON" ] || exit
0
478 # Read configuration variable file if it is present
479 [ -r /etc/default/$NAME ] && . /etc/default/$NAME
481 # Load the VERBOSE setting and other rcS variables
486 [ "$VERBOSE" != no ] && log_daemon_msg "Starting $DESC" "$NAME"
489 0|
1) [ "$VERBOSE" != no ] && log_end_msg
0 ;;
490 2) [ "$VERBOSE" != no ] && log_end_msg
1 ;;
494 [ "$VERBOSE" != no ] && log_daemon_msg "Stopping $DESC" "$NAME"
497 0|
1) [ "$VERBOSE" != no ] && log_end_msg
0 ;;
498 2) [ "$VERBOSE" != no ] && log_end_msg
1 ;;
502 status_of_proc "$DAEMON" "$NAME" && exit
0 || exit $?
504 #reload|force-reload)
506 # If do_reload() is not implemented then leave this commented out
507 # and leave 'force-reload' as an alias for 'restart'.
509 #log_daemon_msg "Reloading $DESC" "$NAME"
513 restart|force-reload)
515 # If the "reload" option is implemented then remove the
516 # 'force-reload' alias
518 log_daemon_msg "Restarting $DESC" "$NAME"
525 1) log_end_msg
1 ;; # Old process is still running
526 *) log_end_msg
1 ;; # Failed to start
536 echo "Usage: $SCRIPTNAME {start|stop|status|restart|force-reload}"
>&
2
544 <p>It is based on /etc/init.d/skeleton, and could be improved quite a
545 lot. I did not really polish the approach, so it might not always
546 work out of the box, but you get the idea. I did not try very hard to
547 optimize it nor make it more robust either.
</p>
549 <p>A better argument for switching init system in Debian than reducing
550 the size of init scripts (which is a good thing to do anyway), is to
551 get boot system that is able to handle the kernel events sensibly and
552 robustly, and do not depend on the boot to run sequentially. The boot
553 and the kernel have not behaved sequentially in years.
</p>
558 Tags:
<a href=
"http://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/debian">debian
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/english">english
</a>.
563 <div class=
"padding"></div>
566 <div class=
"title"><a href=
"http://people.skolelinux.org/pere/blog/Browser_plugin_for_SPICE__spice_xpi__uploaded_to_Debian.html">Browser plugin for SPICE (spice-xpi) uploaded to Debian
</a></div>
567 <div class=
"date"> 1st November
2013</div>
568 <div class=
"body"><p><a href=
"http://www.spice-space.org/">The SPICE protocol
</a> for
569 remote display access is the preferred solution with oVirt and RedHat
570 Enterprise Virtualization, and I was sad to discover the other day
571 that the browser plugin needed to use these systems seamlessly was
572 missing in Debian. The
<a href=
"http://bugs.debian.org/668284">request
573 for a package
</a> was from
2012-
04-
10 with no progress since
574 2013-
04-
01, so I decided to wrap up a package based on the great work
575 from Cajus Pollmeier and put it in a collab-maint maintained git
576 repository to get a package I could use. I would very much like
577 others to help me maintain the package (or just take over, I do not
578 mind), but as no-one had volunteered so far, I just uploaded it to
579 NEW. I hope it will be available in Debian in a few days.
</p>
581 <p>The source is now available from
582 <a href=
"http://anonscm.debian.org/gitweb/?p=collab-maint/spice-xpi.git;a=summary">http://anonscm.debian.org/gitweb/?p=collab-maint/spice-xpi.git;a=summary
</a>.
</p>
587 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>.
592 <div class=
"padding"></div>
595 <div class=
"title"><a href=
"http://people.skolelinux.org/pere/blog/Teaching_vmdebootstrap_to_create_Raspberry_Pi_SD_card_images.html">Teaching vmdebootstrap to create Raspberry Pi SD card images
</a></div>
596 <div class=
"date">27th October
2013</div>
597 <div class=
"body"><p>The
598 <a href=
"http://packages.qa.debian.org/v/vmdebootstrap.html">vmdebootstrap
</a>
599 program is a a very nice system to create virtual machine images. It
600 create a image file, add a partition table, mount it and run
601 debootstrap in the mounted directory to create a Debian system on a
602 stick. Yesterday, I decided to try to teach it how to make images for
603 <a href=
"https://wiki.debian.org/RaspberryPi">Raspberry Pi
</a>, as part
604 of a plan to simplify the build system for
605 <a href=
"https://wiki.debian.org/FreedomBox">the FreedomBox
606 project
</a>. The FreedomBox project already uses vmdebootstrap for
607 the virtualbox images, but its current build system made multistrap
608 based system for Dreamplug images, and it is lacking support for
611 <p>Armed with the knowledge on how to build "foreign" (aka non-native
612 architecture) chroots for Raspberry Pi, I dived into the vmdebootstrap
613 code and adjusted it to be able to build armel images on my amd64
614 Debian laptop. I ended up giving vmdebootstrap five new options,
615 allowing me to replicate the image creation process I use to make
616 <a href=
"http://people.skolelinux.org/pere/blog/A_Raspberry_Pi_based_batman_adv_Mesh_network_node.html">Debian
617 Jessie based mesh node images for the Raspberry Pi
</a>. First, the
618 <tt>--foreign /path/to/binfm_handler
</tt> option tell vmdebootstrap to
619 call debootstrap with --foreign and to copy the handler into the
620 generated chroot before running the second stage. This allow
621 vmdebootstrap to create armel images on an amd64 host. Next I added
622 two new options
<tt>--bootsize size
</tt> and
<tt>--boottype
623 fstype
</tt> to teach it to create a separate /boot/ partition with the
624 given file system type, allowing me to create an image with a vfat
625 partition for the /boot/ stuff. I also added a
<tt>--variant
626 variant
</tt> option to allow me to create smaller images without the
627 Debian base system packages installed. Finally, I added an option
628 <tt>--no-extlinux
</tt> to tell vmdebootstrap to not install extlinux
629 as a boot loader. It is not needed on the Raspberry Pi and probably
630 most other non-x86 architectures. The changes were accepted by the
631 upstream author of vmdebootstrap yesterday and today, and is now
633 <a href=
"http://git.liw.fi/cgi-bin/cgit/cgit.cgi/vmdebootstrap/">the
634 upstream project page
</a>.
</p>
636 <p>To use it to build a Raspberry Pi image using Debian Jessie, first
637 create a small script (the customize script) to add the non-free
638 binary blob needed to boot the Raspberry Pi and the APT source
643 set -e # Exit on first error
646 cat
<<EOF
> etc/apt/sources.list
647 deb http://http.debian.net/debian/ jessie main contrib non-free
649 # Install non-free binary blob needed to boot Raspberry Pi. This
650 # install a kernel somewhere too.
651 wget https://raw.github.com/Hexxeh/rpi-update/master/rpi-update \
652 -O $rootdir/usr/bin/rpi-update
653 chmod a+x $rootdir/usr/bin/rpi-update
654 mkdir -p $rootdir/lib/modules
655 touch $rootdir/boot/start.elf
656 chroot $rootdir rpi-update
659 <p>Next, fetch the latest vmdebootstrap script and call it like this
660 to build the image:
</p>
663 sudo ./vmdebootstrap \
666 --distribution jessie \
667 --mirror http://http.debian.net/debian \
676 --root-password raspberry \
677 --hostname raspberrypi \
678 --foreign /usr/bin/qemu-arm-static \
679 --customize `pwd`/customize \
683 --package ca-certificates \
688 <p>The list of packages being installed are the ones needed by
689 rpi-update to make the image bootable on the Raspberry Pi, with the
690 exception of netbase, which is needed by debootstrap to find
691 /etc/hosts with the minbase variant. I really wish there was a way to
692 set up an Raspberry Pi using only packages in the Debian archive, but
693 that is not possible as far as I know, because it boots from the GPU
694 using a non-free binary blob.
</p>
696 <p>The build host need debootstrap, kpartx and qemu-user-static and
697 probably a few others installed. I have not checked the complete
698 build dependency list.
</p>
700 <p>The resulting image will not use the hardware floating point unit
701 on the Raspberry PI, because the armel architecture in Debian is not
702 optimized for that use. So the images created will be a bit slower
703 than
<a href=
"http://www.raspbian.org/">Raspbian
</a> based images.
</p>
708 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>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/freedombox">freedombox
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/mesh network">mesh network
</a>.
713 <div class=
"padding"></div>
716 <div class=
"title"><a href=
"http://people.skolelinux.org/pere/blog/Det_er_jo_makta_som_er_mest_s_rbar_ved_massiv_overv_kning_av_Internett.html">Det er jo makta som er mest sårbar ved massiv overvåkning av Internett
</a></div>
717 <div class=
"date">26th October
2013</div>
718 <div class=
"body"><p>De siste måneders eksponering av
719 <a href=
"http://www.aftenposten.no/nyheter/uriks/Her-er-Edvard-Snowdens-mest-omtalte-avsloringer-7351734.html">den
720 totale overvåkningen som foregår i den vestlige verden dokumenterer
721 hvor sårbare vi er
</a>. Men det slår meg at de som er mest sårbare
722 for dette, myndighetspersoner på alle nivåer, neppe har innsett at de
723 selv er de mest interessante personene å lage profiler på, for å kunne
726 <p>For å ta et lite eksempel: Stortingets nettsted,
727 <a href=
"http://www.stortinget.no/">www.stortinget.no
</a> (og
729 <a href=
"http://data.stortinget.no/">data.stortinget.no
</a>),
730 inneholder informasjon om det som foregår på Stortinget, og jeg antar
731 de største brukerne av informasjonen der er representanter og
732 rådgivere på Stortinget. Intet overraskende med det. Det som derimot
733 er mer skjult er at Stortingets nettsted bruker
734 <a href=
"http://en.wikipedia.org/wiki/Google_Analytics">Google
735 Analytics
</a>, hvilket gjør at enhver som besøker nettsidene der også
736 rapporterer om besøket via Internett-linjer som passerer Sverige,
737 England og videre til USA. Det betyr at informasjon om ethvert besøk
738 på stortingets nettsider kan snappes opp av svensk, britisk og USAs
739 etterretningsvesen. De kan dermed holde et øye med hvilke
740 Stortingssaker stortingsrepresentantene synes er interessante å sjekke
741 ut, og hvilke sider rådgivere og andre på stortinget synes er
742 interessant å besøke, når de gjør det og hvilke andre representanter
743 som sjekker de samme sidene omtrent samtidig. Stortingets bruk av
744 Google Analytics gjør det dermed enkelt for utenlands etteretning å
745 spore representantenes aktivitet og interesse. Hvis noen av
746 representantene bruker Google Mail eller noen andre tjenestene som
747 krever innlogging, så vil det være enda enklere å finne ut nøyaktig
748 hvilke personer som bruker hvilke nettlesere og dermed knytte
749 informasjonen opp til enkeltpersoner på Stortinget.
</p>
751 <p>Og jo flere nettsteder som bruker Google Analytics, jo bedre
752 oversikt over stortingsrepresentantenes lesevaner og interesse blir
753 tilgjengelig for svensk, britisk og USAs etterretning. Hva de kan
754 bruke den informasjonen til overlater jeg til leseren å undres
760 Tags:
<a href=
"http://people.skolelinux.org/pere/blog/tags/norsk">norsk
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/personvern">personvern
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance
</a>.
765 <div class=
"padding"></div>
768 <div class=
"title"><a href=
"http://people.skolelinux.org/pere/blog/A_Raspberry_Pi_based_batman_adv_Mesh_network_node.html">A Raspberry Pi based batman-adv Mesh network node
</a></div>
769 <div class=
"date">21st October
2013</div>
770 <div class=
"body"><p>The last few days I have been experimenting with
771 <a href=
"http://www.open-mesh.org/projects/batman-adv/wiki">the
772 batman-adv mesh technology
</a>. I want to gain some experience to see
773 if it will fit
<a href=
"https://wiki.debian.org/FreedomBox">the
774 Freedombox project
</a>, and together with my neighbors try to build a
775 mesh network around the park where I live. Batman-adv is a layer
2
776 mesh system ("ethernet" in other words), where the mesh network appear
777 as if all the mesh clients are connected to the same switch.
</p>
779 <p>My hardware of choice was the Linksys WRT54GL routers I had lying
780 around, but I've been unable to get them working with batman-adv. So
781 instead, I started playing with a
782 <a href=
"http://www.raspberrypi.org/">Raspberry Pi
</a>, and tried to
783 get it working as a mesh node. My idea is to use it to create a mesh
784 node which function as a switch port, where everything connected to
785 the Raspberry Pi ethernet plug is connected (bridged) to the mesh
786 network. This allow me to hook a wifi base station like the Linksys
787 WRT54GL to the mesh by plugging it into a Raspberry Pi, and allow
788 non-mesh clients to hook up to the mesh. This in turn is useful for
789 Android phones using
<a href=
"http://servalproject.org/">the Serval
790 Project
</a> voip client, allowing every one around the playground to
791 phone and message each other for free. The reason is that Android
792 phones do not see ad-hoc wifi networks (they are filtered away from
793 the GUI view), and can not join the mesh without being rooted. But if
794 they are connected using a normal wifi base station, they can talk to
795 every client on the local network.
</p>
797 <p>To get this working, I've created a debian package
798 <a href=
"https://github.com/petterreinholdtsen/meshfx-node">meshfx-node
</a>
800 <a href=
"https://github.com/petterreinholdtsen/meshfx-node/blob/master/build-rpi-mesh-node">build-rpi-mesh-node
</a>
801 to create the Raspberry Pi boot image. I'm using Debian Jessie (and
802 not Raspbian), to get more control over the packages available.
803 Unfortunately a huge binary blob need to be inserted into the boot
804 image to get it booting, but I'll ignore that for now. Also, as
805 Debian lack support for the CPU features available in the Raspberry
806 Pi, the system do not use the hardware floating point unit. I hope
807 the routing performance isn't affected by the lack of hardware FPU
810 <p>To create an image, run the following with a sudo enabled user
811 after inserting the target SD card into the build machine:
</p>
814 % wget -O build-rpi-mesh-node \
815 https://raw.github.com/petterreinholdtsen/meshfx-node/master/build-rpi-mesh-node
816 % sudo bash -x ./build-rpi-mesh-node
> build.log
2>&
1
817 % dd if=/root/rpi/rpi_basic_jessie_$(date +%Y%m%d).img of=/dev/mmcblk0 bs=
1M
821 <p>Booting with the resulting SD card on a Raspberry PI with a USB
822 wifi card inserted should give you a mesh node. At least it does for
823 me with a the wifi card I am using. The default mesh settings are the
824 ones used by the Oslo mesh project at Hackeriet, as I mentioned in
825 <a href=
"http://people.skolelinux.org/pere/blog/Oslo_community_mesh_network___with_NUUG_and_Hackeriet_at_Hausmania.html">an
826 earlier blog post about this mesh testing
</a>.
</p>
828 <p>The mesh node was not horribly expensive either. I bought
829 everything over the counter in shops nearby. If I had ordered online
830 from the lowest bidder, the price should be significantly lower:
</p>
834 <tr><th>Supplier
</th><th>Model
</th><th>NOK
</th></tr>
835 <tr><td>Teknikkmagasinet
</td><td>Raspberry Pi model B
</td><td>349.90</td></tr>
836 <tr><td>Teknikkmagasinet
</td><td>Raspberry Pi type B case
</td><td>99.90</td></tr>
837 <tr><td>Lefdal
</td><td>Jensen Air:Link
25150</td><td>295.-
</td></tr>
838 <tr><td>Clas Ohlson
</td><td>Kingston
16 GB SD card
</td><td>199.-
</td></tr>
839 <tr><td>Total cost
</td><td></td><td>943.80</td></tr>
843 <p>Now my mesh network at home consist of one laptop in the basement
844 connected to my production network, one Raspberry Pi node on the
1th
845 floor that can be seen by my neighbor across the park, and one
846 play-node I use to develop the image building script. And some times
847 I hook up my work horse laptop to the mesh to test it. I look forward
848 to figuring out what kind of latency the batman-adv setup will give,
849 and how much packet loss we will experience around the park. :)
</p>
854 Tags:
<a href=
"http://people.skolelinux.org/pere/blog/tags/english">english
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/freedombox">freedombox
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/mesh network">mesh network
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/nuug">nuug
</a>.
859 <div class=
"padding"></div>
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"RSS feed" width=
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</a></li>
1058 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/freeculture">freeculture (
12)
</a></li>
1060 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/freedombox">freedombox (
5)
</a></li>
1062 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (
11)
</a></li>
1064 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/intervju">intervju (
37)
</a></li>
1066 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/isenkram">isenkram (
7)
</a></li>
1068 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/kart">kart (
18)
</a></li>
1070 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/ldap">ldap (
8)
</a></li>
1072 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/lenker">lenker (
6)
</a></li>
1074 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (
1)
</a></li>
1076 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/mesh network">mesh network (
5)
</a></li>
1078 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (
25)
</a></li>
1080 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/norsk">norsk (
237)
</a></li>
1082 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/nuug">nuug (
159)
</a></li>
1084 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (
9)
</a></li>
1086 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/open311">open311 (
2)
</a></li>
1088 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (
45)
</a></li>
1090 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/personvern">personvern (
67)
</a></li>
1092 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/raid">raid (
1)
</a></li>
1094 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/reprap">reprap (
11)
</a></li>
1096 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/rfid">rfid (
2)
</a></li>
1098 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/robot">robot (
9)
</a></li>
1100 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/rss">rss (
1)
</a></li>
1102 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/ruter">ruter (
4)
</a></li>
1104 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (
2)
</a></li>
1106 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (
33)
</a></li>
1108 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (
4)
</a></li>
1110 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (
4)
</a></li>
1112 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/standard">standard (
43)
</a></li>
1114 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (
3)
</a></li>
1116 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (
9)
</a></li>
1118 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (
21)
</a></li>
1120 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (
1)
</a></li>
1122 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/valg">valg (
8)
</a></li>
1124 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/video">video (
39)
</a></li>
1126 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (
4)
</a></li>
1128 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/web">web (
28)
</a></li>
1134 <p style=
"text-align: right">
1135 Created by
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