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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 231
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 233
 234 <li>2014
 235 <ul>
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 258
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 260
 261 </ul></li>
 262
 263 <li>2013
 264 <ul>
 265
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 287
 288 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/12/">December (3)</a></li>
 289
 290 </ul></li>
 291
 292 <li>2012
 293 <ul>
 294
 295 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
 296
 297 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/02/">February (10)</a></li>
 298
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 317 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/12/">December (7)</a></li>
 318
 319 </ul></li>
 320
 321 <li>2011
 322 <ul>
 323
 324 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
 325
 326 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/02/">February (6)</a></li>
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 345
 346 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
 347
 348 </ul></li>
 349
 350 <li>2010
 351 <ul>
 352
 353 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 354
 355 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
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 357 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/03/">March (3)</a></li>
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 374
 375 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
 376
 377 </ul></li>
 378
 379 <li>2009
 380 <ul>
 381
 382 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 383
 384 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
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 400 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
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 404 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 405
 406 </ul></li>
 407
 408 <li>2008
 409 <ul>
 410
 411 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 412
 413 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 414
 415 </ul></li>
 416
 417 </ul>
 418
 419
 420
 421 <h2>Tags</h2>
 422 <ul>
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 441
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 443
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 447
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 461
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 466  <li><a href="http://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (20)</a></li>
 467
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 473
 474  <li><a href="http://people.skolelinux.org/pere/blog/tags/kart">kart (22)</a></li>
 475
 476  <li><a href="http://people.skolelinux.org/pere/blog/tags/kodi">kodi (4)</a></li>
 477
 478  <li><a href="http://people.skolelinux.org/pere/blog/tags/ldap">ldap (9)</a></li>
 479
 480  <li><a href="http://people.skolelinux.org/pere/blog/tags/lego">lego (4)</a></li>
 481
 482  <li><a href="http://people.skolelinux.org/pere/blog/tags/lenker">lenker (8)</a></li>
 483
 484  <li><a href="http://people.skolelinux.org/pere/blog/tags/lsdvd">lsdvd (2)</a></li>
 485
 486  <li><a href="http://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (1)</a></li>
 487
 488  <li><a href="http://people.skolelinux.org/pere/blog/tags/mesh network">mesh network (8)</a></li>
 489
 490  <li><a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (42)</a></li>
 491
 492  <li><a href="http://people.skolelinux.org/pere/blog/tags/nice free software">nice free software (12)</a></li>
 493
 494  <li><a href="http://people.skolelinux.org/pere/blog/tags/noark5">noark5 (21)</a></li>
 495
 496  <li><a href="http://people.skolelinux.org/pere/blog/tags/norsk">norsk (311)</a></li>
 497
 498  <li><a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug (196)</a></li>
 499
 500  <li><a href="http://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (37)</a></li>
 501
 502  <li><a href="http://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
 503
 504  <li><a href="http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (75)</a></li>
 505
 506  <li><a href="http://people.skolelinux.org/pere/blog/tags/personvern">personvern (111)</a></li>
 507
 508  <li><a href="http://people.skolelinux.org/pere/blog/tags/raid">raid (2)</a></li>
 509
 510  <li><a href="http://people.skolelinux.org/pere/blog/tags/reactos">reactos (1)</a></li>
 511
 512  <li><a href="http://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
 513
 514  <li><a href="http://people.skolelinux.org/pere/blog/tags/rfid">rfid (3)</a></li>
 515
 516  <li><a href="http://people.skolelinux.org/pere/blog/tags/robot">robot (12)</a></li>
 517
 518  <li><a href="http://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
 519
 520  <li><a href="http://people.skolelinux.org/pere/blog/tags/ruter">ruter (7)</a></li>
 521
 522  <li><a href="http://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
 523
 524  <li><a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (56)</a></li>
 525
 526  <li><a href="http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
 527
 528  <li><a href="http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (5)</a></li>
 529
 530  <li><a href="http://people.skolelinux.org/pere/blog/tags/standard">standard (69)</a></li>
 531
 532  <li><a href="http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (6)</a></li>
 533
 534  <li><a href="http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (12)</a></li>
 535
 536  <li><a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (57)</a></li>
 537
 538  <li><a href="http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (4)</a></li>
 539
 540  <li><a href="http://people.skolelinux.org/pere/blog/tags/usenix">usenix (2)</a></li>
 541
 542  <li><a href="http://people.skolelinux.org/pere/blog/tags/valg">valg (9)</a></li>
 543
 544  <li><a href="http://people.skolelinux.org/pere/blog/tags/verkidetfri">verkidetfri (17)</a></li>
 545
 546  <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (73)</a></li>
 547
 548  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 549
 550  <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (42)</a></li>
 551
 552 </ul>
 553
 554
 555     </div>
 556     <p style="text-align: right">
 557  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 558 </p>
 559
 560   </body>
 561 </html>