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   6     <title>Petter Reinholdtsen: entries from August 2010</title>
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  14  <h1>
  15      <a href="http://people.skolelinux.org/pere/blog/">Petter Reinholdtsen</a>
  16
  17  </h1>
  18
  19 </div>
  20
  21
  22     <h3>Entries from August 2010.</h3>
  23
  24     <div class="entry">
  25       <div class="title">
  26         <a href="http://people.skolelinux.org/pere/blog/Debian_Edu_roaming_workstation___at_the_university_of_Oslo.html">Debian Edu roaming workstation - at the university of Oslo</a>
  27       </div>
  28       <div class="date">
  29          3rd August 2010
  30       </div>
  31       <div class="body">
  32         <p>The new roaming workstation profile in Debian Edu/Squeeze is fairly
  33 similar to the laptop setup am I working on using Ubuntu for the
  34 University of Oslo, and just for the heck of it, I tested today how
  35 hard it would be to integrate that profile into the university
  36 infrastructure.  In this case, it is the university LDAP server,
  37 Active Directory Kerberos server and SMB mounting from the Netapp file
  38 servers.</p>
  39
  40 <p>I was pleasantly surprised that the only three files needed to be
  41 changed (/etc/sssd/sssd.conf, /etc/ldap.conf and
  42 /etc/mklocaluser.d/20-debian-edu-config) and one file had to be added
  43 (/usr/share/perl5/Debian/Edu_Local.pm), to get the client working.
  44 Most of the changes were to get the client to use the university LDAP
  45 for NSS and Kerberos server for PAM, but one was to change a hard
  46 coded DNS domain name in the mklocaluser hook from .intern to
  47 .uio.no.</p>
  48
  49 <p>This testing was so encouraging, that I went ahead and adjusted the
  50 Debian Edu scripts and setup in subversion to centralise the roaming
  51 workstation setup a bit more and avoid the hardcoded DNS domain name,
  52 so that when I test this tomorrow, I expect to get away with modifying
  53 only /etc/sssd/sssd.conf and /etc/ldap.conf to get it to use the
  54 university servers.</p>
  55
  56 <p>My goal is to get the clients to have no hardcoded settings and
  57 fetch all their initial setup during installation and first boot, to
  58 allow them to be inserted also into environments where the default
  59 setup in Debian Edu has been changed or as with the university, where
  60 the environment is different but provides the protocols Debian Edu
  61 uses.</p>
  62
  63       </div>
  64       <div class="tags">
  65
  66
  67         Tags: <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/nuug">nuug</a>.
  68
  69
  70       </div>
  71     </div>
  72     <div class="padding"></div>
  73
  74     <div class="entry">
  75       <div class="title">
  76         <a href="http://people.skolelinux.org/pere/blog/Autodetecting_Client_setup_for_roaming_workstations_in_Debian_Edu.html">Autodetecting Client setup for roaming workstations in Debian Edu</a>
  77       </div>
  78       <div class="date">
  79          7th August 2010
  80       </div>
  81       <div class="body">
  82         <p>A few days ago, I
  83 <a href="http://people.skolelinux.org/pere/blog/Debian_Edu_roaming_workstation___at_the_university_of_Oslo.html">tried
  84 to install</a> a Roaming workation profile from Debian Edu/Squeeze
  85 while on the university network here at the University of Oslo, and
  86 noticed how much had to change to get it operational using the
  87 university infrastructure.  It was fairly easy, but it occured to me
  88 that Debian Edu would improve a lot if I could get the client to
  89 connect without any changes at all, and thus let the client configure
  90 itself during installation and first boot to use the infrastructure
  91 around it.  Now I am a huge step further along that road.</p>
  92
  93 <p>With our current squeeze-test packages, I can select the roaming
  94 workstation profile and get a working laptop connecting to the
  95 university LDAP server for user and group and our active directory
  96 servers for Kerberos authentication.  All this without any
  97 configuration at all during installation.  My users home directory got
  98 a bookmark in the KDE menu to mount it via SMB, with the correct URL.
  99 In short, openldap and sssd is correctly configured.  In addition to
 100 this, the client look for http://wpad/wpad.dat to configure a web
 101 proxy, and when it fail to find it no proxy settings are stored in
 102 /etc/environment and /etc/apt/apt.conf.  Iceweasel and KDE is
 103 configured to look for the same wpad configuration and also do not use
 104 a proxy when at the university network.  If the machine is moved to a
 105 network with such wpad setup, it would automatically use it when DHCP
 106 gave it a IP address.</p>
 107
 108 <p>The LDAP server is located using DNS, by first looking for the DNS
 109 entry ldap.$domain.  If this do not exist, it look for the
 110 _ldap._tcp.$domain SRV records and use the first one as the LDAP
 111 server.  Next, it connects to the LDAP server and search all
 112 namingContexts entries for posixAccount or posixGroup objects, and
 113 pick the first one as the LDAP base.  For Kerberos, a similar
 114 algorithm is used to locate the LDAP server, and the realm is the
 115 uppercase version of $domain.</p>
 116
 117 <p>So, what is not working, you might ask.  SMB mounting my home
 118 directory do not work.  No idea why, but suspected the incorrect
 119 Kerberos settings in /etc/krb5.conf and /etc/samba/smb.conf might be
 120 the cause.  These are not properly configured during installation, and
 121 had to be hand-edited to get the correct Kerberos realm and server,
 122 but SMB mounting still do not work. :(</p>
 123
 124 <p>With this automatic configuration in place, I expect a Debian Edu
 125 roaming profile installation would be able to automatically detect and
 126 connect to any site using LDAP and Kerberos for NSS directory and PAM
 127 authentication.  It should also work out of the box in a Active
 128 Directory environment providing posixAccount and posixGroup objects
 129 with UID and GID values.</p>
 130
 131 <p>If you want to help out with implementing these things for Debian
 132 Edu, please contact us on debian-edu@lists.debian.org.</p>
 133
 134       </div>
 135       <div class="tags">
 136
 137
 138         Tags: <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/nuug">nuug</a>.
 139
 140
 141       </div>
 142     </div>
 143     <div class="padding"></div>
 144
 145     <div class="entry">
 146       <div class="title">
 147         <a href="http://people.skolelinux.org/pere/blog/Testing_if_a_file_system_can_be_used_for_home_directories___.html">Testing if a file system can be used for home directories...</a>
 148       </div>
 149       <div class="date">
 150          8th August 2010
 151       </div>
 152       <div class="body">
 153         <p>A few years ago, I was involved in a project planning to use
 154 Windows file servers as home directory servers for Debian
 155 Edu/Skolelinux machines.  This was thought to be no problem, as the
 156 access would be through the SMB network file system protocol, and we
 157 knew other sites used SMB with unix and samba as the file server to
 158 mount home directories without any problems.  But, after months of
 159 struggling, we had to conclude that our goal was impossible.</p>
 160
 161 <p>The reason is simply that while SMB can be used for home
 162 directories when the file server is Samba running on Unix, this only
 163 work because of Samba have some extensions and the fact that the
 164 underlying file system is a unix file system.  When using a Windows
 165 file server, the underlying file system do not have POSIX semantics,
 166 and several programs will fail if the users home directory where they
 167 want to store their configuration lack POSIX semantics.</p>
 168
 169 <p>As part of this work, I wrote a small C program I want to share
 170 with you all, to replicate a few of the problematic applications (like
 171 OpenOffice.org and GCompris) and see if the file system was working as
 172 it should.  If you find yourself in spooky file system land, it might
 173 help you find your way out again.  This is the fs-test.c source:</p>
 174
 175 <pre>
 176 /*
 177  * Some tests to check the file system sematics.  Used to verify that
 178  * CIFS from a windows server do not work properly as a linux home
 179  * directory.
 180  * License: GPL v2 or later
 181  *
 182  * needs libsqlite3-dev and build-essential installed
 183  * compile with: gcc -Wall -lsqlite3 -DTEST_SQLITE fs-test.c -o fs-test
 184 */
 185
 186 #define _FILE_OFFSET_BITS 64
 187 #define _LARGEFILE_SOURCE 1
 188 #define _LARGEFILE64_SOURCE 1
 189
 190 #define _GNU_SOURCE /* for asprintf() */
 191
 192 #include &lt;errno.h>
 193 #include &lt;fcntl.h>
 194 #include &lt;stdio.h>
 195 #include &lt;string.h>
 196 #include &lt;stdlib.h>
 197 #include &lt;sys/file.h>
 198 #include &lt;sys/stat.h>
 199 #include &lt;sys/types.h>
 200 #include &lt;unistd.h>
 201
 202 #ifdef TEST_SQLITE
 203 /*
 204  * Test sqlite open, as done by gcompris require the libsqlite3-dev
 205  * package and linking with -lsqlite3.  A more low level test is
 206  * below.
 207  * See also &lt;URL: http://www.sqlite.org./faq.html#q5 >.
 208  */
 209 #include &lt;sqlite3.h>
 210 #define CREATE_TABLE_USERS                                              \
 211   "CREATE TABLE users (user_id INT UNIQUE, login TEXT, lastname TEXT, firstname TEXT, birthdate TEXT, class_id INT ); "
 212 int test_sqlite_open(void) {
 213   char *zErrMsg;
 214   char *name = "testsqlite.db";
 215   sqlite3 *db=NULL;
 216   unlink(name);
 217   int rc = sqlite3_open(name, &db);
 218   if( rc ){
 219     printf("error: sqlite open of %s failed: %s\n", name, sqlite3_errmsg(db));
 220     sqlite3_close(db);
 221     return -1;
 222   }
 223
 224   /* create tables */
 225   rc = sqlite3_exec(db,CREATE_TABLE_USERS, NULL,  0, &zErrMsg);
 226   if( rc != SQLITE_OK ){
 227     printf("error: sqlite table create failed: %s\n", zErrMsg);
 228     sqlite3_close(db);
 229     return -1;
 230   }
 231   printf("info: sqlite worked\n");
 232   sqlite3_close(db);
 233   return 0;
 234 }
 235 #endif /* TEST_SQLITE */
 236
 237 /*
 238  * Demonstrate locking issue found in gcompris using sqlite3.  This
 239  * work with ext3, but not with cifs server on Windows 2003.  This is
 240  * done in the sqlite3 library.
 241  * See also
 242  * &lt;URL:http://www.cygwin.com/ml/cygwin/2001-08/msg00854.html> and the
 243  * POSIX specification
 244  * &lt;URL:http://www.opengroup.org/onlinepubs/009695399/functions/fcntl.html>.
 245  */
 246 int test_gcompris_locking(void) {
 247   struct flock fl;
 248   char *name = "testsqlite.db";
 249   unlink(name);
 250   int fd = open(name, O_RDWR|O_CREAT|O_LARGEFILE, 0644);
 251   printf("info: testing fcntl locking\n");
 252
 253   fl.l_whence = SEEK_SET;
 254   fl.l_pid    = getpid();
 255   printf("  Read-locking 1 byte from 1073741824");
 256   fl.l_start  = 1073741824;
 257   fl.l_len    = 1;
 258   fl.l_type   = F_RDLCK;
 259   if (0 != fcntl(fd, F_SETLK, &fl) ) printf(" - error!\n"); else printf("\n");
 260
 261   printf("  Read-locking 510 byte from 1073741826");
 262   fl.l_start  = 1073741826;
 263   fl.l_len    = 510;
 264   fl.l_type   = F_RDLCK;
 265   if (0 != fcntl(fd, F_SETLK, &fl) ) printf(" - error!\n"); else printf("\n");
 266
 267   printf("  Unlocking 1 byte from 1073741824");
 268   fl.l_start  = 1073741824;
 269   fl.l_len    = 1;
 270   fl.l_type   = F_UNLCK;
 271   if (0 != fcntl(fd, F_SETLK, &fl) ) printf(" - error!\n"); else printf("\n");
 272
 273   printf("  Write-locking 1 byte from 1073741824");
 274   fl.l_start  = 1073741824;
 275   fl.l_len    = 1;
 276   fl.l_type   = F_WRLCK;
 277   if (0 != fcntl(fd, F_SETLK, &fl) ) printf(" - error!\n"); else printf("\n");
 278
 279   printf("  Write-locking 510 byte from 1073741826");
 280   fl.l_start  = 1073741826;
 281   fl.l_len    = 510;
 282   if (0 != fcntl(fd, F_SETLK, &fl) ) printf(" - error!\n"); else printf("\n");
 283
 284   printf("  Unlocking 2 byte from 1073741824");
 285   fl.l_start  = 1073741824;
 286   fl.l_len    = 2;
 287   fl.l_type   = F_UNLCK;
 288   if (0 != fcntl(fd, F_SETLK, &fl) ) printf(" - error!\n"); else printf("\n");
 289
 290   close(fd);
 291   return 0;
 292 }
 293
 294 /*
 295  * Test if permissions of freshly created directories allow entries
 296  * below them.  This was a problem with OpenOffice.org and gcompris.
 297  * Mounting with option 'sync' seem to solve this problem while
 298  * slowing down file operations.
 299  */
 300 int test_subdirectory_creation(void) {
 301 #define LEVELS 5
 302   char *path = strdup("test");
 303   char *dirs[LEVELS];
 304   int level;
 305   printf("info: testing subdirectory creation\n");
 306   for (level = 0; level &lt; LEVELS; level++) {
 307     char *newpath = NULL;
 308     if (-1 == mkdir(path, 0777)) {
 309       printf("  error: Unable to create directory '%s': %s\n",
 310              path, strerror(errno));
 311       break;
 312     }
 313     asprintf(&newpath, "%s/%s", path, "test");
 314     free(path);
 315     path = newpath;
 316   }
 317   return 0;
 318 }
 319
 320 /*
 321  * Test if symlinks can be created.  This was a problem detected with
 322  * KDE.
 323  */
 324 int test_symlinks(void) {
 325   printf("info: testing symlink creation\n");
 326   unlink("symlink");
 327   if (-1 == symlink("file", "symlink"))
 328     printf("  error: Unable to create symlink\n");
 329   return 0;
 330 }
 331
 332 int main(int argc, char **argv) {
 333   printf("Testing POSIX/Unix sematics on file system\n");
 334   test_symlinks();
 335   test_subdirectory_creation();
 336 #ifdef TEST_SQLITE
 337   test_sqlite_open();
 338 #endif /* TEST_SQLITE */
 339   test_gcompris_locking();
 340   return 0;
 341 }
 342 </pre>
 343
 344 <p>When everything is working, it should print something like
 345 this:</p>
 346
 347 <pre>
 348 Testing POSIX/Unix sematics on file system
 349 info: testing symlink creation
 350 info: testing subdirectory creation
 351 info: sqlite worked
 352 info: testing fcntl locking
 353   Read-locking 1 byte from 1073741824
 354   Read-locking 510 byte from 1073741826
 355   Unlocking 1 byte from 1073741824
 356   Write-locking 1 byte from 1073741824
 357   Write-locking 510 byte from 1073741826
 358   Unlocking 2 byte from 1073741824
 359 </pre>
 360
 361 <p>I do not remember the exact details of the problems we saw, but one
 362 of them was with locking, where if I remember correctly, POSIX allow a
 363 read-only lock to be upgraded to a read-write lock without unlocking
 364 the read-only lock (while Windows do not).  Another was a bug in the
 365 CIFS/SMB client implementation in the Linux kernel where directory
 366 meta information would be wrong for a fraction of a second, making
 367 OpenOffice.org fail to create its deep directory tree because it was
 368 not allowed to create files in its freshly created directory.</p>
 369
 370 <p>Anyway, here is a nice tool for your tool box, might you never need
 371 it. :)</p>
 372
 373 <p>Update 2010-08-27: Michael Gebetsroither report that he found the
 374 script so useful that he created a GIT repository and stored it in
 375 <a href="http://github.com/gebi/fs-test">http://github.com/gebi/fs-test</a>.</p>
 376
 377       </div>
 378       <div class="tags">
 379
 380
 381         Tags: <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/nuug">nuug</a>.
 382
 383
 384       </div>
 385     </div>
 386     <div class="padding"></div>
 387
 388     <div class="entry">
 389       <div class="title">
 390         <a href="http://people.skolelinux.org/pere/blog/No_hardcoded_config_on_Debian_Edu_clients.html">No hardcoded config on Debian Edu clients</a>
 391       </div>
 392       <div class="date">
 393          9th August 2010
 394       </div>
 395       <div class="body">
 396         <p>As reported earlier, the last few days I have looked at how Debian
 397 Edu clients are configured, and tried to get rid of all hardcoded
 398 configuration settings on the clients.  I believe the work to be
 399 mostly done, and the clients seem to work just fine with dynamically
 400 generated configuration.</p>
 401
 402 <p>What is the point, you might ask?  The point is to allow a Debian
 403 Edu desktop to integrate into an existing network infrastructure
 404 without any manual configuration.</p>
 405
 406 <p>This is what happens when installing a Debian Edu client here at
 407 the University of Oslo using PXE.  With the PXE installation, I am
 408 asked for language (Norwegian Bokmål), locality (Norway) and keyboard
 409 layout (no-latin1), Debian Edu profile (Roaming Workstation), if I
 410 accept to reformat the hard drive (yes), if I want to submit info to
 411 popcon.debian.org (no) and root password (secret).  After answering
 412 these questions, the installer goes ahead and does its thing, and
 413 after around 50 minutes it is done.  I press enter to finish the
 414 installation, and the machine reboots into KDE.  When the machine is
 415 ready and kdm asks for login information, I enter my university
 416 username and password, am told by kdm that a local home directory has
 417 been created and that I must log in again, and finally log in with the
 418 same username and password to the KDE 4.4 desktop.  At no point during
 419 this process did it ask for university specific settings, and all the
 420 required configuration was dynamically detected using information
 421 fetched via DHCP and DNS.  The roaming workstation is now ready for
 422 use.</p>
 423
 424 <p>How was this done, you might wonder?  First of all, here is the
 425 list of things that need to be configured on the client to get it
 426 working properly out of the box:</p>
 427
 428 <ul>
 429 <li>IP address/netmask and DNS server.</li>
 430 <li>Web proxy URL.</li>
 431 <li>LDAP server for NSS directory information (user, group, etc).</li>
 432 <li>Kerberos server for PAM password checking.</li>
 433 <li>SMB mount point to access the network home directory. (*)</li>
 434 <li>Central syslog server to send syslog messages to. (*)</li>
 435 <li>Sitesummary collector URL to submit info to central server. (*)</li>
 436 </ul>
 437
 438 <p>(Hm, did I forget anything?  Let me knew if I did.)</p>
 439
 440 <p>The points marked (*) are not required to be able to use the
 441 machine, but needed to provide central storage and allowing system
 442 administrators to track their machines.  Since yesterday, everything
 443 but the sitesummary collector URL is dynamically discovered at boot
 444 and installation time in the svn version of Debian Edu.</p>
 445
 446 <p>The IP and DNS setup is fetched during boot using DHCP as usual.
 447 When a DHCP update arrives, the proxy setup is updated by looking for
 448 http://wpat/wpad.dat and using the content of this WPAD file to
 449 configure the http and ftp proxy in /etc/environment and
 450 /etc/apt/apt.conf.  I decided to update the proxy setup using a DHCP
 451 hook to ensure that the client stops using the Debian Edu proxy when
 452 it is moved outside the Debian Edu network, and instead uses any local
 453 proxy present on the new network when it moves around.</p>
 454
 455 <p>The DNS names of the LDAP, Kerberos and syslog server and related
 456 configuration are generated using DNS information at boot.  First the
 457 installer looks for a host named ldap in the current DNS domain.  If
 458 not found, it looks for _ldap._tcp SRV records in DNS instead.  If an
 459 LDAP server is found, its root DSE entry is requested and the
 460 attributes namingContexts and defaultNamingContext are used to
 461 determine which LDAP base to use for NSS.  If there are several
 462 namingContexts attibutes and the defaultNamingContext is present, that
 463 LDAP subtree is used as the base.  If defaultNamingContext is missing,
 464 the subtrees listed as namingContexts are searched in sequence for any
 465 object with class posixAccount or posixGroup, and the first one with
 466 such an object is used as the LDAP base.  For Kerberos, a similar
 467 search is done by first looking for a host named kerberos, and then
 468 for the _kerberos._tcp SRV record.  I've been unable to find a way to
 469 look up the Kerberos realm, so for this the upper case string of the
 470 current DNS domain is used.</p>
 471
 472 <p>For the syslog server, the hosts syslog and loghost are searched
 473 for, and the _syslog._udp SRV record is consulted if no such host is
 474 found.  This algorithm works for both Debian Edu and the University of
 475 Oslo.  A similar strategy would work for locating the sitesummary
 476 server, but have not been implemented yet.  I decided to fetch and
 477 save these settings during installation, to make sure moving to a
 478 different network does not change the set of users being allowed to
 479 log in nor the passwords required to log in.  Usernames and passwords
 480 will be cached by sssd when the user logs in on the Debian Edu
 481 network, and will not change as the laptop move around.  For a
 482 non-roaming machine, there is no caching, but given that it is
 483 supposed to stay in place it should not matter much.  Perhaps we
 484 should switch those to use sssd too?</p>
 485
 486 <p>The user's SMB mount point for the network home directory is
 487 located when the user logs in for the first time.  The LDAP server is
 488 consulted to look for the user's LDAP object and the sambaHomePath
 489 attribute is used if found.  If it isn't found, the home directory
 490 path fetched from NSS is used instead.  Assuming the path is of the
 491 form /site/server/directory/username, the second part is looked up in
 492 DNS and used to generate a SMB URL of the form
 493 smb://server.domain/username.  This algorithm works for both Debian
 494 edu and the University of Oslo.  Perhaps there are better attributes
 495 to use or a better algorithm that works for more sites, but this will
 496 do for now. :)</p>
 497
 498 <p>This work should make it easier to integrate the Debian Edu clients
 499 into any LDAP/Kerberos infrastructure, and make the current setup even
 500 more flexible than before.  I suspect it will also work for thin
 501 client servers, allowing one to easily set up LTSP and hook it into a
 502 existing network infrastructure, but I have not had time to test this
 503 yet.</p>
 504
 505 <p>If you want to help out with implementing these things for Debian
 506 Edu, please contact us on debian-edu@lists.debian.org.</p>
 507
 508 <p>Update 2010-08-09: Simon Farnsworth gave me a heads-up on how to
 509 detect Kerberos realm from DNS, by looking for _kerberos TXT entries
 510 before falling back to the upper case DNS domain name.  Will have to
 511 implement it for Debian Edu. :)</p>
 512
 513       </div>
 514       <div class="tags">
 515
 516
 517         Tags: <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/nuug">nuug</a>.
 518
 519
 520       </div>
 521     </div>
 522     <div class="padding"></div>
 523
 524     <div class="entry">
 525       <div class="title">
 526         <a href="http://people.skolelinux.org/pere/blog/Rob_Weir__How_to_Crush_Dissent.html">Rob Weir: How to Crush Dissent</a>
 527       </div>
 528       <div class="date">
 529         15th August 2010
 530       </div>
 531       <div class="body">
 532         <p>I found the notes from Rob Weir on
 533 <a href="http://feedproxy.google.com/~r/robweir/antic-atom/~3/VGb23-kta8c/how-to-crush-dissent.html">how
 534 to crush dissent</a> matching my own thoughts on the matter quite
 535 well.  Highly recommended for those wondering which road our society
 536 should go down.  In my view we have been heading the wrong way for a
 537 long time.</p>
 538
 539       </div>
 540       <div class="tags">
 541
 542
 543         Tags: <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/lenker">lenker</a>, <a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug</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>.
 544
 545
 546       </div>
 547     </div>
 548     <div class="padding"></div>
 549
 550     <div class="entry">
 551       <div class="title">
 552         <a href="http://people.skolelinux.org/pere/blog/2_Spykee_roboter_i_hus__n__skal_det_lekes.html">2 Spykee-roboter i hus, nå skal det lekes</a>
 553       </div>
 554       <div class="date">
 555         18th August 2010
 556       </div>
 557       <div class="body">
 558         <p>Jeg kjøpte nettopp to
 559 <a href="http://www.spykee-robot.com/">Spykee</a>-roboter, for test og
 560 leking.  Kjøpte to da det var så billige, og gir meg mulighet til å
 561 eksperimentere uten å være veldig redd for å ødelegge alt ved å bytte
 562 ut firmware og slikt.  Oppdaget at lekebutikken på Bryn senter hadde
 563 en liten stabel på lager som de ikke hadde klart å selge ut etter
 564 fjorårets juleinnkjøp, og var villig til å selge for en femtedel av
 565 vanlig pris.  Jeg, Ronny og Jarle har skaffet oss restbeholdningen, og
 566 det blir morsomt å se hva vi får ut av dette.</p>
 567
 568 <p>Roboten har belter styrt av to motorer, kamera, høytaler, mikrofon
 569 og wifi-tilkobling.  Det hele styrt av en GPL-lisensiert databoks som
 570 jeg mistenker kjører linux.  Firmware-kildekoden ble visst publisert i
 571 mai.  Eneste utfordringen er at kontroller-programvaren kun finnes til
 572 Windows, men det må en kunne jobbe seg rundt når vi har kildekoden til
 573 firmwaren. :)</p>
 574
 575 <ul>
 576 <li><a href="http://en.wikipedia.org/wiki/Spykee">Wikipedia-oppføring</a></li>
 577 <li><a href="http://www.spykeeworld.com/spykee/US/freeSoftware.html">Nedlasting av firmware-kilden</a></li>
 578 <li><a href="http://wiki.nuug.no/grupper/robot">prosjektwiki hos NUUG</a></li>
 579 </ul>
 580
 581       </div>
 582       <div class="tags">
 583
 584
 585         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/robot">robot</a>.
 586
 587
 588       </div>
 589     </div>
 590     <div class="padding"></div>
 591
 592     <div class="entry">
 593       <div class="title">
 594         <a href="http://people.skolelinux.org/pere/blog/Robot__reis_deg___.html">Robot, reis deg...</a>
 595       </div>
 596       <div class="date">
 597         21st August 2010
 598       </div>
 599       <div class="body">
 600         <p>I dag fikk jeg endelig tittet litt på mine nyinnkjøpte roboter, og
 601 har brukt noen timer til å google etter interessante referanser og
 602 aktuell kildekode for bruk på Linux.  Det mest lovende så langt er
 603 <a href="http://ispykee.toyz.org/">ispykee</a>, som har en
 604 BSD-lisensiert linux-daemon som står som mellomledd mellom roboter på
 605 lokalnettet og en sentral tjeneste der en iPhone kan koble seg opp for
 606 å fjernstyre roboten.  Linux-daemonen implementerer deler av
 607 protokollen som roboten forstår.  Etter å ha knotet litt med å oppnå
 608 kontakt med roboten (den oppretter et eget ad-hoc wifi-nett, så jeg
 609 måtte gå av mitt vanlige nett for å få kontakt), og kommet frem til at
 610 den lytter på IP-port 9000 og 9001, gikk jeg i gang med å finne ut
 611 hvordan jeg kunne snakke med roboten vha. disse portene.  Robotbiten
 612 av protokollen er publisert av produsenten med GPL-lisens, slik at det
 613 er mulig å se hvordan protokollen fungerer.  Det finnes en java-klient
 614 for Android som så ganske snasen ut, men fant ingen kildekode for
 615 denne.  Derimot hadde iphone-løsningen kildekode, så jeg tok
 616 utgangspunkt i den.</p>
 617
 618 <p>Daemonen ville i utgangspunktet forsøke å kontakte den sentrale
 619 tjenesten som iphone-programmet kobler seg til.  Jeg skrev dette om
 620 til i stedet å sette opp en nettverkstjeneste på min lokale maskin,
 621 som jeg kan koble meg opp til med telnet og gi kommandoer til roboten
 622 (act, forward, right, left, etc).  Det involverte i praksis å bytte ut
 623 socket()/connect() med socket()/bind()/listen()/accept() for å gjøre
 624 klienten om til en tjener.</p>
 625
 626 <p>Mens jeg har forsøkt å få roboten til å bevege seg har min samboer
 627 skrudd sammen resten av roboten for å få montert kamera og plastpynten
 628 (armer, plastfiber for lys).  Nå er det hele montert, og roboten er
 629 klar til bruk.  Må få flyttet den over til mitt vanlige trådløsnett
 630 før det blir praktisk, men de bitene av protokollen er ikke
 631 implementert i ispykee-daemonen, så der må jeg enten få tak i en mac
 632 eller en windows-maskin, eller implementere det selv.</p>
 633
 634 <p>Vi var tre som kjøpte slike roboter, og vi har blitt enige om å
 635 samle notater og referanser på <a
 636 href="http://wiki.nuug.no/grupper/robot/">NUUGs wiki</a>.  Ta en titt
 637 der hvis du er nysgjerrig.</p>
 638
 639       </div>
 640       <div class="tags">
 641
 642
 643         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/robot">robot</a>.
 644
 645
 646       </div>
 647     </div>
 648     <div class="padding"></div>
 649
 650     <div class="entry">
 651       <div class="title">
 652         <a href="http://people.skolelinux.org/pere/blog/Elektronisk_stemmegiving_er_ikke_til___stole_p____heller_ikke_i_Norge.html">Elektronisk stemmegiving er ikke til å stole på - heller ikke i Norge</a>
 653       </div>
 654       <div class="date">
 655         23rd August 2010
 656       </div>
 657       <div class="body">
 658         <p>I Norge pågår en prosess for å
 659 <a href="http://www.e-valg.dep.no/">innføre elektronisk
 660 stemmegiving</a> ved kommune- og stortingsvalg.  Dette skal
 661 introduseres i 2011.  Det er all grunn til å tro at valg i Norge ikke
 662 vil være til å stole på hvis dette blir gjennomført.  Da det hele var
 663 oppe til høring i 2006 forfattet jeg
 664 <a href="http://www.nuug.no/dokumenter/valg-horing-2006-09.pdf">en
 665 høringsuttalelse fra NUUG</a> (og EFN som hengte seg på) som skisserte
 666 hvilke punkter som må oppfylles for at en skal kunne stole på et valg,
 667 og elektronisk stemmegiving mangler flere av disse.  Elektronisk
 668 stemmegiving er for alle praktiske formål å putte ens stemme i en sort
 669 boks under andres kontroll, og satse på at de som har kontroll med
 670 boksen er til å stole på - uten at en har mulighet til å verifisere
 671 dette selv.  Det er ikke slik en gjennomfører demokratiske valg.</p>
 672
 673 <p>Da problemet er fundamentalt med hvordan elektronisk stemmegiving
 674 må fungere for at også ikke-krypografer skal kunne delta, har det vært
 675 mange rapporter om hvordan elektronisk stemmegiving har sviktet i land
 676 etter land.  En
 677 <a href="http://wiki.nuug.no/uttalelser/2006-elektronisk-stemmegiving">liten
 678 samling referanser</a> finnes på NUUGs wiki.  Den siste er fra India,
 679 der valgkomisjonen har valgt
 680 <a href="http://www.freedom-to-tinker.com/blog/jhalderm/electronic-voting-researcher-arrested-over-anonymous-source">å
 681 pusse politiet på en forsker</a> som har dokumentert svakheter i
 682 valgsystemet.</p>
 683
 684 <p>Her i Norge har en valgt en annen tilnærming, der en forsøker seg
 685 med teknobabbel for å få befolkningen til å tro at dette skal bli
 686 sikkert.  Husk, elektronisk stemmegiving underminerer de demokratiske
 687 valgene i Norge, og bør ikke innføres.</p>
 688
 689 <p>Den offentlige diskusjonen blir litt vanskelig av at media har
 690 valgt å kalle dette "evalg", som kan sies å både gjelde elektronisk
 691 opptelling av valget som Norge har gjort siden 60-tallet og som er en
 692 svært god ide, og elektronisk opptelling som er en svært dårlig ide.
 693 Diskusjonen gir ikke mening hvis en skal diskutere om en er for eller
 694 mot "evalg", og jeg forsøker derfor å være klar på at jeg snakker om
 695 elektronisk stemmegiving og unngå begrepet "evalg".</p>
 696
 697       </div>
 698       <div class="tags">
 699
 700
 701         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/sikkerhet">sikkerhet</a>, <a href="http://people.skolelinux.org/pere/blog/tags/valg">valg</a>.
 702
 703
 704       </div>
 705     </div>
 706     <div class="padding"></div>
 707
 708     <div class="entry">
 709       <div class="title">
 710         <a href="http://people.skolelinux.org/pere/blog/Broken_umask_handling_with_sshfs.html">Broken umask handling with sshfs</a>
 711       </div>
 712       <div class="date">
 713         26th August 2010
 714       </div>
 715       <div class="body">
 716         <p>My file system sematics program
 717 <a href="http://people.skolelinux.org/pere/blog/Testing_if_a_file_system_can_be_used_for_home_directories___.html">presented
 718 a few days ago</a> is very useful to verify that a file system can
 719 work as a unix home directory,and today I had to extend it a bit.  I'm
 720 looking into alternatives for home directory access here at the
 721 University of Oslo, and one of the options is sshfs.  My friend
 722 Finn-Arne mentioned a while back that they had used sshfs with Debian
 723 Edu, but stopped because of problems.  I asked today what the problems
 724 where, and he mentioned that sshfs failed to handle umask properly.
 725 Trying to detect the problem I wrote this addition to my fs testing
 726 script:</p>
 727
 728 <pre>
 729 mode_t touch_get_mode(const char *name, mode_t mode) {
 730   mode_t retval = 0;
 731   int fd = open(name, O_RDWR|O_CREAT|O_LARGEFILE, mode);
 732   if (-1 != fd) {
 733     unlink(name);
 734     struct stat statbuf;
 735     if (-1 != fstat(fd, &statbuf)) {
 736       retval = statbuf.st_mode & 0x1ff;
 737     }
 738     close(fd);
 739   }
 740   return retval;
 741 }
 742
 743 /* Try to detect problem discovered using sshfs */
 744 int test_umask(void) {
 745   printf("info: testing umask effect on file creation\n");
 746
 747   mode_t orig_umask = umask(000);
 748   mode_t newmode;
 749   if (0666 != (newmode = touch_get_mode("foobar", 0666))) {
 750     printf("  error: Wrong file mode %o when creating using mode 666 and umask 000\n",
 751            newmode);
 752   }
 753   umask(007);
 754   if (0660 != (newmode = touch_get_mode("foobar", 0666))) {
 755     printf("  error: Wrong file mode %o when creating using mode 666 and umask 007\n",
 756            newmode);
 757   }
 758
 759   umask (orig_umask);
 760   return 0;
 761 }
 762
 763 int main(int argc, char **argv) {
 764   [...]
 765   test_umask();
 766   return 0;
 767 }
 768 </pre>
 769
 770 <p>Sure enough.  On NFS to a netapp, I get this result:</p>
 771
 772 <pre>
 773 Testing POSIX/Unix sematics on file system
 774 info: testing symlink creation
 775 info: testing subdirectory creation
 776 info: testing fcntl locking
 777   Read-locking 1 byte from 1073741824
 778   Read-locking 510 byte from 1073741826
 779   Unlocking 1 byte from 1073741824
 780   Write-locking 1 byte from 1073741824
 781   Write-locking 510 byte from 1073741826
 782   Unlocking 2 byte from 1073741824
 783 info: testing umask effect on file creation
 784 </pre>
 785
 786 <p>When mounting the same directory using sshfs, I get this
 787 result:</p>
 788
 789 <pre>
 790 Testing POSIX/Unix sematics on file system
 791 info: testing symlink creation
 792 info: testing subdirectory creation
 793 info: testing fcntl locking
 794   Read-locking 1 byte from 1073741824
 795   Read-locking 510 byte from 1073741826
 796   Unlocking 1 byte from 1073741824
 797   Write-locking 1 byte from 1073741824
 798   Write-locking 510 byte from 1073741826
 799   Unlocking 2 byte from 1073741824
 800 info: testing umask effect on file creation
 801   error: Wrong file mode 644 when creating using mode 666 and umask 000
 802   error: Wrong file mode 640 when creating using mode 666 and umask 007
 803 </pre>
 804
 805 <p>So, I can conclude that sshfs is better than smb to a Netapp or a
 806 Windows server, but not good enough to be used as a home
 807 directory.</p>
 808
 809 <p>Update 2010-08-26: Reported the issue in
 810 <a href="http://bugs.debian.org/594498">BTS report #594498</a></p>
 811
 812 <p>Update 2010-08-27: Michael Gebetsroither report that he found the
 813 script so useful that he created a GIT repository and stored it in
 814 <a href="http://github.com/gebi/fs-test">http://github.com/gebi/fs-test</a>.</p>
 815
 816       </div>
 817       <div class="tags">
 818
 819
 820         Tags: <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/nuug">nuug</a>.
 821
 822
 823       </div>
 824     </div>
 825     <div class="padding"></div>
 826
 827     <div class="entry">
 828       <div class="title">
 829         <a href="http://people.skolelinux.org/pere/blog/Skolelinux_i_Osloskolen.html">Skolelinux i Osloskolen</a>
 830       </div>
 831       <div class="date">
 832         26th August 2010
 833       </div>
 834       <div class="body">
 835         <p>Denne høsten skal endelig alle Osloskolene få mulighet til å bruke
 836 <a href="http://www.skolelinux.org/">Skolelinux</a>.  Ny IT-løsning
 837 har vært rullet ut i noen måneder nå, og så vidt jeg fikk vite før
 838 sommeren skulle alle skoler ha nytt opplegg på plass før oppstart nå i
 839 høst.  På alle skolene skal en kunne velge ved installasjon om en skal
 840 ha Windows eller Skolelinux på maskinene, og en kan i tillegg
 841 PXE-boote maskinene over nett som tynne klienter eller diskløse
 842 arbeidsstasjoner. Jeg er spent på hvor mange skoler som velger å ta i
 843 bruk Skolelinux, og gleder meg til å se hvordan dette utvikler seg.
 844 Løsningen leveres av
 845 <a href="http://www.logica.no/">Logica</a> med
 846 <a href="http://www.slxdrift.no/">Skolelinux Drift AS</a> som
 847 underleverandør, og jeg har vært involvert i utviklingen av løsningen
 848 via Skolelinux Drift AS siden prosjektet starter.  Jeg synes det er
 849 fantastisk at Skolelinux er kommet så langt siden vi startet i 2001 at
 850 alle elevene i Osloskolene nå skal få mulighet til å bruke
 851 løsningen.  Jeg håper de vil sette pris på alle de
 852 <a href="http://www.skolelinux.no/linux-signpost/">fantastiske
 853 brukerprogrammene</a> som er tilgjengelig i Skolelinux.</p>
 854
 855       </div>
 856       <div class="tags">
 857
 858
 859         Tags: <a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu</a>, <a href="http://people.skolelinux.org/pere/blog/tags/norsk">norsk</a>.
 860
 861
 862       </div>
 863     </div>
 864     <div class="padding"></div>
 865
 866     <div class="entry">
 867       <div class="title">
 868         <a href="http://people.skolelinux.org/pere/blog/Sikkerhetsteateret_p__flyplassene_fortsetter.html">Sikkerhetsteateret på flyplassene fortsetter</a>
 869       </div>
 870       <div class="date">
 871         28th August 2010
 872       </div>
 873       <div class="body">
 874         <p>Jeg skrev for et halvt år siden hvordan
 875 <a href="http://people.skolelinux.org/pere/blog/Sikkerhet__teater__og_hvordan_gj__re_verden_sikrere.html">samfunnet
 876 kaster bort ressurser på sikkerhetstiltak som ikke fungerer</a>.  Kom
 877 nettopp over en
 878 <a href="http://www.askthepilot.com/essays-and-stories/terrorism-tweezers-and-terminal-madness-an-essay-on-security/">historie
 879 fra en pilot fra USA</a> som kommenterer det samme.  Jeg mistenker det
 880 kun er uvitenhet og autoritetstro som gjør at så få protesterer.  Har
 881 veldig sans for piloten omtalt i <a
 882 href="http://www.aftenposten.no/nyheter/iriks/article2057501.ece">Aftenposten</a> 2007-10-23,
 883 og skulle ønske flere rettet oppmerksomhet mot problemet.  Det gir
 884 ikke meg trygghetsfølelse på flyplassene når jeg ser at
 885 flyplassadministrasjonen kaster bort folk, penger og tid på tull i
 886 stedet for ting som bidrar til reell økning av sikkerheten.  Det
 887 forteller meg jo at vurderingsevnen til de som burde bidra til økt
 888 sikkerhet er svært sviktende, noe som ikke taler godt for de andre
 889 tiltakene.</p>
 890
 891 <p>Mon tro hva som skjer hvis det fantes en enkel brosjyre å skrive ut
 892 fra Internet som forklarte hva som er galt med sikkerhetsopplegget på
 893 flyplassene, og folk skrev ut og la en bunke på flyplassene når de
 894 passerte.  Kanskje det ville fått flere til å få øynene opp for
 895 problemet.</p>
 896
 897 <p>Personlig synes jeg flyopplevelsen er blitt så avskyelig at jeg
 898 forsøker å klare meg med tog, bil og båt for å slippe ubehaget.  Det
 899 er dog noe vanskelig i det langstrakte Norge og for å kunne besøke de
 900 delene av verden jeg ønsker å nå.  Mistenker at flere har det slik, og
 901 at dette går ut over inntjeningen til flyselskapene.  Det er antagelig
 902 en god ting sett fra et miljøperspektiv, men det er en annen sak.</p>
 903
 904       </div>
 905       <div class="tags">
 906
 907
 908         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/personvern">personvern</a>, <a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet</a>.
 909
 910
 911       </div>
 912     </div>
 913     <div class="padding"></div>
 914
 915     <div class="entry">
 916       <div class="title">
 917         <a href="http://people.skolelinux.org/pere/blog/Broken_hard_link_handling_with_sshfs.html">Broken hard link handling with sshfs</a>
 918       </div>
 919       <div class="date">
 920         30th August 2010
 921       </div>
 922       <div class="body">
 923         <p>Just got an email from Tobias Gruetzmacher as a followup on my
 924 <a href="http://people.skolelinux.org/pere/blog/Broken_umask_handling_with_sshfs.html">previous
 925 post about sshfs</a>.  He reported another problem with sshfs.  It
 926 fail to handle hard links properly.  A simple way to spot this is to
 927 look at the . and .. entries in the directory tree.  These should have
 928 a link count >1, but on sshfs the count is 1.  I just tested to see
 929 what happen when trying to hardlink, and this fail as well:</p>
 930
 931 <pre>
 932 % ln foo bar
 933 ln: creating hard link `bar' => `foo': Function not implemented
 934 %
 935 </pre>
 936
 937 <p>I have not yet found time to implement a test for this in my file
 938 system test code, but believe having working hard links is useful to
 939 avoid surprised unix programs.  Not as useful as working file locking
 940 and symlinks, which are required to get a working desktop, but useful
 941 nevertheless. :)</p>
 942
 943 <p>The latest version of the file system test code is available via
 944 git from
 945 <a href="http://github.com/gebi/fs-test">http://github.com/gebi/fs-test</a></p>
 946
 947       </div>
 948       <div class="tags">
 949
 950
 951         Tags: <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/nuug">nuug</a>.
 952
 953
 954       </div>
 955     </div>
 956     <div class="padding"></div>
 957
 958     <div class="entry">
 959       <div class="title">
 960         <a href="http://people.skolelinux.org/pere/blog/Forslag_i_stortinget_om___stoppe_elektronisk_stemmegiving_i_Norge.html">Forslag i stortinget om å stoppe elektronisk stemmegiving i Norge</a>
 961       </div>
 962       <div class="date">
 963         31st August 2010
 964       </div>
 965       <div class="body">
 966         <p>Ble tipset i dag om at et forslag om å stoppe forsøkene med
 967 elektronisk stemmegiving utenfor valglokaler er
 968 <a href="http://www.stortinget.no/no/Saker-og-publikasjoner/Saker/Sak/?p=46616">til
 969 behandling</a> i Stortinget.
 970 <a href="http://www.stortinget.no/Global/pdf/Representantforslag/2009-2010/dok8-200910-128.pdf">Forslaget</a>
 971 er fremmet av Erna Solberg, Michael Tetzschner og Trond Helleland.</p>
 972
 973 <p>Håper det får flertall.</p>
 974
 975       </div>
 976       <div class="tags">
 977
 978
 979         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/sikkerhet">sikkerhet</a>, <a href="http://people.skolelinux.org/pere/blog/tags/valg">valg</a>.
 980
 981
 982       </div>
 983     </div>
 984     <div class="padding"></div>
 985
 986     <p style="text-align: right;"><a href="08.rss"><img src="http://people.skolelinux.org/pere/blog/xml.gif" alt="RSS Feed" width="36" height="14" /></a></p>
 987     <div id="sidebar">
 988
 989
 990
 991 <h2>Archive</h2>
 992 <ul>
 993
 994 <li>2012
 995 <ul>
 996
 997 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
 998
 999 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/02/">February (10)</a></li>
1000
1001 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/03/">March (17)</a></li>
1002
1003 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/04/">April (12)</a></li>
1004
1005 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/05/">May (12)</a></li>
1006
1007 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/06/">June (20)</a></li>
1008
1009 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/07/">July (13)</a></li>
1010
1011 </ul></li>
1012
1013 <li>2011
1014 <ul>
1015
1016 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
1017
1018 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/02/">February (6)</a></li>
1019
1020 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/03/">March (6)</a></li>
1021
1022 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/04/">April (7)</a></li>
1023
1024 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/05/">May (3)</a></li>
1025
1026 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/06/">June (2)</a></li>
1027
1028 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/07/">July (7)</a></li>
1029
1030 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/08/">August (6)</a></li>
1031
1032 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/09/">September (4)</a></li>
1033
1034 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/10/">October (2)</a></li>
1035
1036 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/11/">November (3)</a></li>
1037
1038 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
1039
1040 </ul></li>
1041
1042 <li>2010
1043 <ul>
1044
1045 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
1046
1047 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
1048
1049 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/03/">March (3)</a></li>
1050
1051 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/04/">April (3)</a></li>
1052
1053 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/05/">May (9)</a></li>
1054
1055 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/06/">June (14)</a></li>
1056
1057 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/07/">July (12)</a></li>
1058
1059 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/08/">August (13)</a></li>
1060
1061 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/09/">September (7)</a></li>
1062
1063 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/10/">October (9)</a></li>
1064
1065 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/11/">November (13)</a></li>
1066
1067 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
1068
1069 </ul></li>
1070
1071 <li>2009
1072 <ul>
1073
1074 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
1075
1076 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
1077
1078 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/03/">March (12)</a></li>
1079
1080 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/04/">April (10)</a></li>
1081
1082 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/05/">May (9)</a></li>
1083
1084 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/06/">June (3)</a></li>
1085
1086 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
1087
1088 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
1089
1090 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
1091
1092 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
1093
1094 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
1095
1096 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
1097
1098 </ul></li>
1099
1100 <li>2008
1101 <ul>
1102
1103 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
1104
1105 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
1106
1107 </ul></li>
1108
1109 </ul>
1110
1111
1112
1113 <h2>Tags</h2>
1114 <ul>
1115
1116  <li><a href="http://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (13)</a></li>
1117
1118  <li><a href="http://people.skolelinux.org/pere/blog/tags/amiga">amiga (1)</a></li>
1119
1120  <li><a href="http://people.skolelinux.org/pere/blog/tags/aros">aros (1)</a></li>
1121
1122  <li><a href="http://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (2)</a></li>
1123
1124  <li><a href="http://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem (12)</a></li>
1125
1126  <li><a href="http://people.skolelinux.org/pere/blog/tags/bsa">bsa (2)</a></li>
1127
1128  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian">debian (55)</a></li>
1129
1130  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (109)</a></li>
1131
1132  <li><a href="http://people.skolelinux.org/pere/blog/tags/digistan">digistan (9)</a></li>
1133
1134  <li><a href="http://people.skolelinux.org/pere/blog/tags/drivstoffpriser">drivstoffpriser (4)</a></li>
1135
1136  <li><a href="http://people.skolelinux.org/pere/blog/tags/english">english (142)</a></li>
1137
1138  <li><a href="http://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (17)</a></li>
1139
1140  <li><a href="http://people.skolelinux.org/pere/blog/tags/fildeling">fildeling (12)</a></li>
1141
1142  <li><a href="http://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (6)</a></li>
1143
1144  <li><a href="http://people.skolelinux.org/pere/blog/tags/intervju">intervju (30)</a></li>
1145
1146  <li><a href="http://people.skolelinux.org/pere/blog/tags/kart">kart (16)</a></li>
1147
1148  <li><a href="http://people.skolelinux.org/pere/blog/tags/ldap">ldap (8)</a></li>
1149
1150  <li><a href="http://people.skolelinux.org/pere/blog/tags/lenker">lenker (4)</a></li>
1151
1152  <li><a href="http://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (1)</a></li>
1153
1154  <li><a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (22)</a></li>
1155
1156  <li><a href="http://people.skolelinux.org/pere/blog/tags/norsk">norsk (188)</a></li>
1157
1158  <li><a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug (140)</a></li>
1159
1160  <li><a href="http://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (4)</a></li>
1161
1162  <li><a href="http://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
1163
1164  <li><a href="http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (33)</a></li>
1165
1166  <li><a href="http://people.skolelinux.org/pere/blog/tags/personvern">personvern (48)</a></li>
1167
1168  <li><a href="http://people.skolelinux.org/pere/blog/tags/raid">raid (1)</a></li>
1169
1170  <li><a href="http://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
1171
1172  <li><a href="http://people.skolelinux.org/pere/blog/tags/rfid">rfid (2)</a></li>
1173
1174  <li><a href="http://people.skolelinux.org/pere/blog/tags/robot">robot (4)</a></li>
1175
1176  <li><a href="http://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
1177
1178  <li><a href="http://people.skolelinux.org/pere/blog/tags/ruter">ruter (4)</a></li>
1179
1180  <li><a href="http://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
1181
1182  <li><a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (23)</a></li>
1183
1184  <li><a href="http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
1185
1186  <li><a href="http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (1)</a></li>
1187
1188  <li><a href="http://people.skolelinux.org/pere/blog/tags/standard">standard (35)</a></li>
1189
1190  <li><a href="http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (1)</a></li>
1191
1192  <li><a href="http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (4)</a></li>
1193
1194  <li><a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (10)</a></li>
1195
1196  <li><a href="http://people.skolelinux.org/pere/blog/tags/valg">valg (6)</a></li>
1197
1198  <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (32)</a></li>
1199
1200  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (1)</a></li>
1201
1202  <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (25)</a></li>
1203
1204 </ul>
1205
1206
1207     </div>
1208     <p style="text-align: right">
1209  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.4</a>
1210 </p>
1211
1212   </body>
1213 </html>