blog/Circular_package_dependencies_harms_apt_recovery.html

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   6     <title>Petter Reinholdtsen: Circular package dependencies harms apt recovery</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     <div class="entry">
  23       <div class="title">Circular package dependencies harms apt recovery</div>
  24       <div class="date">27th July 2010</div>
  25       <div class="body"><p>I discovered this while doing
  26 <a href="http://people.skolelinux.org/pere/blog/Automatic_upgrade_testing_from_Lenny_to_Squeeze.html">automated
  27 testing of upgrades from Debian Lenny to Squeeze</a>.  A few packages
  28 in Debian still got circular dependencies, and it is often claimed
  29 that apt and aptitude should be able to handle this just fine, but
  30 some times these dependency loops causes apt to fail.</p>
  31
  32 <p>An example is from todays
  33 <a href="http://people.skolelinux.org/~pere/debian-upgrade-testing//test-20100727-lenny-squeeze-kde-aptitude.txt">upgrade
  34 of KDE using aptitude</a>.  In it, a bug in kdebase-workspace-data
  35 causes perl-modules to fail to upgrade.  The cause is simple.  If a
  36 package fail to unpack, then only part of packages with the circular
  37 dependency might end up being unpacked when unpacking aborts, and the
  38 ones already unpacked will fail to configure in the recovery phase
  39 because its dependencies are unavailable.</p>
  40
  41 <p>In this log, the problem manifest itself with this error:</p>
  42
  43 <blockquote><pre>
  44 dpkg: dependency problems prevent configuration of perl-modules:
  45  perl-modules depends on perl (>= 5.10.1-1); however:
  46   Version of perl on system is 5.10.0-19lenny2.
  47 dpkg: error processing perl-modules (--configure):
  48  dependency problems - leaving unconfigured
  49 </pre></blockquote>
  50
  51 <p>The perl/perl-modules circular dependency is already
  52 <a href="http://bugs.debian.org/527917">reported as a bug</a>, and will
  53 hopefully be solved as soon as possible, but it is not the only one,
  54 and each one of these loops in the dependency tree can cause similar
  55 failures.  Of course, they only occur when there are bugs in other
  56 packages causing the unpacking to fail, but it is rather nasty when
  57 the failure of one package causes the problem to become worse because
  58 of dependency loops.</p>
  59
  60 <p>Thanks to
  61 <a href="http://lists.debian.org/debian-devel/2010/06/msg00116.html">the
  62 tireless effort by Bill Allombert</a>, the number of circular
  63 dependencies
  64 <a href="http://debian.semistable.com/debgraph.out.html">left in Debian
  65 is dropping</a>, and perhaps it will reach zero one day. :)</p>
  66
  67 <p>Todays testing also exposed a bug in
  68 <a href="http://bugs.debian.org/590605">update-notifier</a> and
  69 <a href="http://bugs.debian.org/590604">different behaviour</a> between
  70 apt-get and aptitude, the latter possibly caused by some circular
  71 dependency.  Reported both to BTS to try to get someone to look at
  72 it.</p>
  73 </div>
  74
  75       <div class="tags">Tags: <a href="http://people.skolelinux.org/pere/blog/tags/debian">debian</a>, <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug</a>.</div>
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  87 <h2>Archive</h2>
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 239
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 241
 242 <li>2014
 243 <ul>
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 266
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 268
 269 </ul></li>
 270
 271 <li>2013
 272 <ul>
 273
 274 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/01/">January (11)</a></li>
 275
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 287
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 291
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 295
 296 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/12/">December (3)</a></li>
 297
 298 </ul></li>
 299
 300 <li>2012
 301 <ul>
 302
 303 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
 304
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 317 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/08/">August (6)</a></li>
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 321 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/10/">October (17)</a></li>
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 323 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/11/">November (10)</a></li>
 324
 325 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/12/">December (7)</a></li>
 326
 327 </ul></li>
 328
 329 <li>2011
 330 <ul>
 331
 332 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
 333
 334 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/02/">February (6)</a></li>
 335
 336 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/03/">March (6)</a></li>
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 338 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/04/">April (7)</a></li>
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 340 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/05/">May (3)</a></li>
 341
 342 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/06/">June (2)</a></li>
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 344 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/07/">July (7)</a></li>
 345
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 347
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 350 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/10/">October (2)</a></li>
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 353
 354 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
 355
 356 </ul></li>
 357
 358 <li>2010
 359 <ul>
 360
 361 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 362
 363 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
 364
 365 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/03/">March (3)</a></li>
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 381 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/11/">November (13)</a></li>
 382
 383 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
 384
 385 </ul></li>
 386
 387 <li>2009
 388 <ul>
 389
 390 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 391
 392 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
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 394 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/03/">March (12)</a></li>
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 400 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/06/">June (3)</a></li>
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 402 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
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 406 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
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 408 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
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 410 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
 411
 412 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 413
 414 </ul></li>
 415
 416 <li>2008
 417 <ul>
 418
 419 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 420
 421 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 422
 423 </ul></li>
 424
 425 </ul>
 426
 427
 428
 429 <h2>Tags</h2>
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 449
 450  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian">debian (170)</a></li>
 451
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 455
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 457
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 473
 474  <li><a href="http://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (20)</a></li>
 475
 476  <li><a href="http://people.skolelinux.org/pere/blog/tags/h264">h264 (20)</a></li>
 477
 478  <li><a href="http://people.skolelinux.org/pere/blog/tags/intervju">intervju (43)</a></li>
 479
 480  <li><a href="http://people.skolelinux.org/pere/blog/tags/isenkram">isenkram (16)</a></li>
 481
 482  <li><a href="http://people.skolelinux.org/pere/blog/tags/kart">kart (22)</a></li>
 483
 484  <li><a href="http://people.skolelinux.org/pere/blog/tags/kodi">kodi (4)</a></li>
 485
 486  <li><a href="http://people.skolelinux.org/pere/blog/tags/ldap">ldap (9)</a></li>
 487
 488  <li><a href="http://people.skolelinux.org/pere/blog/tags/lego">lego (4)</a></li>
 489
 490  <li><a href="http://people.skolelinux.org/pere/blog/tags/lenker">lenker (8)</a></li>
 491
 492  <li><a href="http://people.skolelinux.org/pere/blog/tags/lsdvd">lsdvd (2)</a></li>
 493
 494  <li><a href="http://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (1)</a></li>
 495
 496  <li><a href="http://people.skolelinux.org/pere/blog/tags/mesh network">mesh network (8)</a></li>
 497
 498  <li><a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (42)</a></li>
 499
 500  <li><a href="http://people.skolelinux.org/pere/blog/tags/nice free software">nice free software (13)</a></li>
 501
 502  <li><a href="http://people.skolelinux.org/pere/blog/tags/noark5">noark5 (22)</a></li>
 503
 504  <li><a href="http://people.skolelinux.org/pere/blog/tags/norsk">norsk (314)</a></li>
 505
 506  <li><a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug (197)</a></li>
 507
 508  <li><a href="http://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (38)</a></li>
 509
 510  <li><a href="http://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
 511
 512  <li><a href="http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (75)</a></li>
 513
 514  <li><a href="http://people.skolelinux.org/pere/blog/tags/personvern">personvern (111)</a></li>
 515
 516  <li><a href="http://people.skolelinux.org/pere/blog/tags/raid">raid (2)</a></li>
 517
 518  <li><a href="http://people.skolelinux.org/pere/blog/tags/reactos">reactos (1)</a></li>
 519
 520  <li><a href="http://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
 521
 522  <li><a href="http://people.skolelinux.org/pere/blog/tags/rfid">rfid (3)</a></li>
 523
 524  <li><a href="http://people.skolelinux.org/pere/blog/tags/robot">robot (12)</a></li>
 525
 526  <li><a href="http://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
 527
 528  <li><a href="http://people.skolelinux.org/pere/blog/tags/ruter">ruter (7)</a></li>
 529
 530  <li><a href="http://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
 531
 532  <li><a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (57)</a></li>
 533
 534  <li><a href="http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
 535
 536  <li><a href="http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (5)</a></li>
 537
 538  <li><a href="http://people.skolelinux.org/pere/blog/tags/standard">standard (70)</a></li>
 539
 540  <li><a href="http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (7)</a></li>
 541
 542  <li><a href="http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (12)</a></li>
 543
 544  <li><a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (60)</a></li>
 545
 546  <li><a href="http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (4)</a></li>
 547
 548  <li><a href="http://people.skolelinux.org/pere/blog/tags/usenix">usenix (2)</a></li>
 549
 550  <li><a href="http://people.skolelinux.org/pere/blog/tags/valg">valg (9)</a></li>
 551
 552  <li><a href="http://people.skolelinux.org/pere/blog/tags/verkidetfri">verkidetfri (18)</a></li>
 553
 554  <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (74)</a></li>
 555
 556  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 557
 558  <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (42)</a></li>
 559
 560 </ul>
 561
 562
 563     </div>
 564     <p style="text-align: right">
 565  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 566 </p>
 567
 568   </body>
 569 </html>