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>
  76
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  78     </div>
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  84
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  86
  87 <h2>Archive</h2>
  88 <ul>
  89
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 149 <li>2018
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 167
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 169
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 171
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 173
 174 </ul></li>
 175
 176 <li>2017
 177 <ul>
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 190
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 194
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 196
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 198
 199 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/12/">December (4)</a></li>
 200
 201 </ul></li>
 202
 203 <li>2016
 204 <ul>
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 206 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/01/">January (3)</a></li>
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 223
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 225
 226 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/11/">November (8)</a></li>
 227
 228 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/12/">December (5)</a></li>
 229
 230 </ul></li>
 231
 232 <li>2015
 233 <ul>
 234
 235 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/01/">January (7)</a></li>
 236
 237 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/02/">February (6)</a></li>
 238
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 240
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 242
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 244
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 246
 247 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/07/">July (6)</a></li>
 248
 249 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/08/">August (2)</a></li>
 250
 251 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/09/">September (2)</a></li>
 252
 253 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/10/">October (9)</a></li>
 254
 255 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/11/">November (6)</a></li>
 256
 257 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/12/">December (3)</a></li>
 258
 259 </ul></li>
 260
 261 <li>2014
 262 <ul>
 263
 264 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/01/">January (2)</a></li>
 265
 266 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/02/">February (3)</a></li>
 267
 268 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/03/">March (8)</a></li>
 269
 270 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/04/">April (7)</a></li>
 271
 272 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/05/">May (1)</a></li>
 273
 274 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/06/">June (2)</a></li>
 275
 276 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/07/">July (2)</a></li>
 277
 278 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/08/">August (2)</a></li>
 279
 280 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/09/">September (5)</a></li>
 281
 282 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/10/">October (6)</a></li>
 283
 284 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/11/">November (3)</a></li>
 285
 286 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/12/">December (5)</a></li>
 287
 288 </ul></li>
 289
 290 <li>2013
 291 <ul>
 292
 293 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/01/">January (11)</a></li>
 294
 295 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/02/">February (9)</a></li>
 296
 297 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/03/">March (9)</a></li>
 298
 299 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/04/">April (6)</a></li>
 300
 301 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/05/">May (9)</a></li>
 302
 303 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/06/">June (10)</a></li>
 304
 305 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/07/">July (7)</a></li>
 306
 307 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/08/">August (3)</a></li>
 308
 309 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/09/">September (5)</a></li>
 310
 311 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/10/">October (7)</a></li>
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 313 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/11/">November (9)</a></li>
 314
 315 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/12/">December (3)</a></li>
 316
 317 </ul></li>
 318
 319 <li>2012
 320 <ul>
 321
 322 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
 323
 324 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/02/">February (10)</a></li>
 325
 326 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/03/">March (17)</a></li>
 327
 328 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/04/">April (12)</a></li>
 329
 330 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/05/">May (12)</a></li>
 331
 332 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/06/">June (20)</a></li>
 333
 334 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/07/">July (17)</a></li>
 335
 336 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/08/">August (6)</a></li>
 337
 338 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/09/">September (9)</a></li>
 339
 340 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/10/">October (17)</a></li>
 341
 342 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/11/">November (10)</a></li>
 343
 344 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/12/">December (7)</a></li>
 345
 346 </ul></li>
 347
 348 <li>2011
 349 <ul>
 350
 351 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
 352
 353 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/02/">February (6)</a></li>
 354
 355 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/03/">March (6)</a></li>
 356
 357 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/04/">April (7)</a></li>
 358
 359 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/05/">May (3)</a></li>
 360
 361 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/06/">June (2)</a></li>
 362
 363 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/07/">July (7)</a></li>
 364
 365 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/08/">August (6)</a></li>
 366
 367 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/09/">September (4)</a></li>
 368
 369 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/10/">October (2)</a></li>
 370
 371 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/11/">November (3)</a></li>
 372
 373 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
 374
 375 </ul></li>
 376
 377 <li>2010
 378 <ul>
 379
 380 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 381
 382 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
 383
 384 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/03/">March (3)</a></li>
 385
 386 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/04/">April (3)</a></li>
 387
 388 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/05/">May (9)</a></li>
 389
 390 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/06/">June (14)</a></li>
 391
 392 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/07/">July (12)</a></li>
 393
 394 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/08/">August (13)</a></li>
 395
 396 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/09/">September (7)</a></li>
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 398 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/10/">October (9)</a></li>
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 400 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/11/">November (13)</a></li>
 401
 402 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
 403
 404 </ul></li>
 405
 406 <li>2009
 407 <ul>
 408
 409 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 410
 411 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
 412
 413 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/03/">March (12)</a></li>
 414
 415 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/04/">April (10)</a></li>
 416
 417 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/05/">May (9)</a></li>
 418
 419 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/06/">June (3)</a></li>
 420
 421 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
 422
 423 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
 424
 425 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
 426
 427 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
 428
 429 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
 430
 431 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 432
 433 </ul></li>
 434
 435 <li>2008
 436 <ul>
 437
 438 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 439
 440 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 441
 442 </ul></li>
 443
 444 </ul>
 445
 446
 447
 448 <h2>Tags</h2>
 449 <ul>
 450
 451  <li><a href="http://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (16)</a></li>
 452
 453  <li><a href="http://people.skolelinux.org/pere/blog/tags/amiga">amiga (1)</a></li>
 454
 455  <li><a href="http://people.skolelinux.org/pere/blog/tags/aros">aros (1)</a></li>
 456
 457  <li><a href="http://people.skolelinux.org/pere/blog/tags/bankid">bankid (4)</a></li>
 458
 459  <li><a href="http://people.skolelinux.org/pere/blog/tags/betalkontant">betalkontant (9)</a></li>
 460
 461  <li><a href="http://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (12)</a></li>
 462
 463  <li><a href="http://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem (17)</a></li>
 464
 465  <li><a href="http://people.skolelinux.org/pere/blog/tags/bsa">bsa (2)</a></li>
 466
 467  <li><a href="http://people.skolelinux.org/pere/blog/tags/chrpath">chrpath (2)</a></li>
 468
 469  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian">debian (175)</a></li>
 470
 471  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (159)</a></li>
 472
 473  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian-handbook">debian-handbook (7)</a></li>
 474
 475  <li><a href="http://people.skolelinux.org/pere/blog/tags/digistan">digistan (11)</a></li>
 476
 477  <li><a href="http://people.skolelinux.org/pere/blog/tags/dld">dld (17)</a></li>
 478
 479  <li><a href="http://people.skolelinux.org/pere/blog/tags/docbook">docbook (28)</a></li>
 480
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 563  <li><a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (61)</a></li>
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 566
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 571  <li><a href="http://people.skolelinux.org/pere/blog/tags/verkidetfri">verkidetfri (19)</a></li>
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 578
 579 </ul>
 580
 581
 582     </div>
 583     <p style="text-align: right">
 584  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 585 </p>
 586
 587   </body>
 588 </html>