2 * Copyright (c) 2007-2009, Novell Inc.
4 * This program is licensed under the BSD license, read LICENSE.BSD
5 * for further information
20 #include "solver_private.h"
25 #include "solverdebug.h"
27 /**********************************************************************************/
29 /* a problem is an item on the solver's problem list. It can either be >0, in that
30 * case it is a update/infarch/dup rule, or it can be <0, which makes it refer to a job
31 * consisting of multiple job rules.
35 solver_disableproblem(Solver *solv, Id v)
42 if (v >= solv->infarchrules && v < solv->infarchrules_end)
44 Pool *pool = solv->pool;
45 Id name = pool->solvables[-solv->rules[v].p].name;
46 while (v > solv->infarchrules && pool->solvables[-solv->rules[v - 1].p].name == name)
48 for (; v < solv->infarchrules_end && pool->solvables[-solv->rules[v].p].name == name; v++)
49 solver_disablerule(solv, solv->rules + v);
52 if (v >= solv->duprules && v < solv->duprules_end)
54 Pool *pool = solv->pool;
55 Id name = pool->solvables[-solv->rules[v].p].name;
56 while (v > solv->duprules && pool->solvables[-solv->rules[v - 1].p].name == name)
58 for (; v < solv->duprules_end && pool->solvables[-solv->rules[v].p].name == name; v++)
59 solver_disablerule(solv, solv->rules + v);
62 solver_disablerule(solv, solv->rules + v);
66 jp = solv->ruletojob.elements;
67 if (solv->bestrules_info)
69 int ni = solv->bestrules_up - solv->bestrules;
70 for (i = 0; i < ni; i++)
72 int j = solv->bestrules_info[i];
73 if (j < 0 && jp[-j - solv->jobrules] == v)
74 solver_disablerule(solv, solv->rules + solv->bestrules + i);
77 for (i = solv->jobrules; i < solv->jobrules_end; i++, jp++)
79 solver_disablerule(solv, solv->rules + i);
82 /*-------------------------------------------------------------------
87 solver_enableproblem(Solver *solv, Id v)
95 if (v >= solv->infarchrules && v < solv->infarchrules_end)
97 Pool *pool = solv->pool;
98 Id name = pool->solvables[-solv->rules[v].p].name;
99 while (v > solv->infarchrules && pool->solvables[-solv->rules[v - 1].p].name == name)
101 for (; v < solv->infarchrules_end && pool->solvables[-solv->rules[v].p].name == name; v++)
102 solver_enablerule(solv, solv->rules + v);
105 if (v >= solv->duprules && v < solv->duprules_end)
107 Pool *pool = solv->pool;
108 Id name = pool->solvables[-solv->rules[v].p].name;
109 while (v > solv->duprules && pool->solvables[-solv->rules[v - 1].p].name == name)
111 for (; v < solv->duprules_end && pool->solvables[-solv->rules[v].p].name == name; v++)
112 solver_enablerule(solv, solv->rules + v);
115 if (v >= solv->featurerules && v < solv->featurerules_end)
117 /* do not enable feature rule if update rule is enabled */
118 r = solv->rules + (v - solv->featurerules + solv->updaterules);
122 solver_enablerule(solv, solv->rules + v);
123 if (v >= solv->updaterules && v < solv->updaterules_end)
125 /* disable feature rule when enabling update rule */
126 r = solv->rules + (v - solv->updaterules + solv->featurerules);
128 solver_disablerule(solv, r);
133 jp = solv->ruletojob.elements;
134 if (solv->bestrules_info)
136 int ni = solv->bestrules_up - solv->bestrules;
137 for (i = 0; i < ni; i++)
139 int j = solv->bestrules_info[i];
140 if (j < 0 && jp[-j - solv->jobrules] == v)
141 solver_enablerule(solv, solv->rules + solv->bestrules + i);
144 for (i = solv->jobrules; i < solv->jobrules_end; i++, jp++)
146 solver_enablerule(solv, solv->rules + i);
150 /*-------------------------------------------------------------------
151 * turn a problem rule into a problem id by normalizing it
154 solver_ruletoproblem(Solver *solv, Id rid)
156 if (rid >= solv->jobrules && rid < solv->jobrules_end)
157 rid = -(solv->ruletojob.elements[rid - solv->jobrules] + 1);
158 else if (rid >= solv->bestrules && rid < solv->bestrules_up && solv->bestrules_info[rid - solv->bestrules] < 0)
159 rid = -(solv->ruletojob.elements[-solv->bestrules_info[rid - solv->bestrules] - solv->jobrules] + 1);
160 else if (rid > solv->infarchrules && rid < solv->infarchrules_end)
162 Pool *pool = solv->pool;
163 Id name = pool->solvables[-solv->rules[rid].p].name;
164 while (rid > solv->infarchrules && pool->solvables[-solv->rules[rid - 1].p].name == name)
167 else if (rid > solv->duprules && rid < solv->duprules_end)
169 Pool *pool = solv->pool;
170 Id name = pool->solvables[-solv->rules[rid].p].name;
171 while (rid > solv->duprules && pool->solvables[-solv->rules[rid - 1].p].name == name)
177 /*-------------------------------------------------------------------
178 * when the solver runs into a problem, it needs to disable all
179 * involved non-pkg rules and record the rules for solution
183 solver_recordproblem(Solver *solv, Id rid)
185 Id v = solver_ruletoproblem(solv, rid);
186 /* return if problem already countains our rule */
187 if (solv->problems.count)
190 for (i = solv->problems.count - 1; i >= 0; i--)
191 if (solv->problems.elements[i] == 0) /* end of last problem reached? */
193 else if (solv->problems.elements[i] == v)
196 queue_push(&solv->problems, v);
199 /*-------------------------------------------------------------------
200 * this is called when a problem is solved by disabling a rule.
201 * It calls disableproblem and then re-enables policy rules
204 solver_fixproblem(Solver *solv, Id rid)
206 Id v = solver_ruletoproblem(solv, rid);
207 solver_disableproblem(solv, v);
209 solver_reenablepolicyrules(solv, -v);
212 /*-------------------------------------------------------------------
213 * disable a set of problems
216 solver_disableproblemset(Solver *solv, int start)
219 for (i = start + 1; i < solv->problems.count - 1; i++)
220 solver_disableproblem(solv, solv->problems.elements[i]);
223 /*-------------------------------------------------------------------
224 * try to fix a problem by auto-uninstalling packages
227 solver_autouninstall(Solver *solv, int start)
229 Pool *pool = solv->pool;
231 int lastfeature = 0, lastupdate = 0;
236 if (!solv->allowuninstall && !solv->allowuninstall_all)
238 if (!solv->allowuninstallmap.size)
239 return 0; /* why did we get called? */
240 m = &solv->allowuninstallmap;
242 for (i = start + 1; i < solv->problems.count - 1; i++)
244 v = solv->problems.elements[i];
246 extraflags &= solv->job.elements[-v - 1];
247 if (v >= solv->updaterules && v < solv->updaterules_end)
250 Id p = solv->installed->start + (v - solv->updaterules);
251 if (m && !MAPTST(m, v - solv->updaterules))
253 if (pool->considered && !MAPTST(pool->considered, p))
254 continue; /* do not uninstalled disabled packages */
255 if (solv->bestrules_info && solv->bestrules_end > solv->bestrules)
258 for (j = start + 1; j < solv->problems.count - 1; j++)
260 Id vv = solv->problems.elements[j];
261 if (vv >= solv->bestrules && vv < solv->bestrules_end && solv->bestrules_info[vv - solv->bestrules] == p)
264 if (j < solv->problems.count - 1)
265 continue; /* best rule involved, do not uninstall */
267 /* check if identical to feature rule, we don't like that (except for orphans) */
268 r = solv->rules + solv->featurerules + (v - solv->updaterules);
271 /* update rule == feature rule */
274 /* prefer orphaned packages in dup mode */
275 if (solv->keep_orphans)
278 if (!r->d && !r->w2 && r->p == p)
291 if (!lastupdate && !lastfeature)
293 v = lastupdate ? lastupdate : lastfeature;
294 POOL_DEBUG(SOLV_DEBUG_UNSOLVABLE, "allowuninstall disabling ");
295 solver_printruleclass(solv, SOLV_DEBUG_UNSOLVABLE, solv->rules + v);
296 /* should really be solver_fixproblem, but we know v is an update/feature rule */
297 solver_disableproblem(solv, v);
298 if (extraflags != -1 && (extraflags & SOLVER_CLEANDEPS) != 0 && solv->cleandepsmap.size)
300 /* add the package to the updatepkgs list, this will automatically turn
301 * on cleandeps mode */
302 Id p = solv->rules[v].p;
303 if (!solv->cleandeps_updatepkgs)
305 solv->cleandeps_updatepkgs = solv_calloc(1, sizeof(Queue));
306 queue_init(solv->cleandeps_updatepkgs);
310 int oldupdatepkgscnt = solv->cleandeps_updatepkgs->count;
311 queue_pushunique(solv->cleandeps_updatepkgs, p);
312 if (solv->cleandeps_updatepkgs->count != oldupdatepkgscnt)
313 solver_disablepolicyrules(solv);
320 /*-------------------------------------------------------------------
323 * Reenable all disabled weak rules (marked in weakrulemap)
328 enableweakrules(Solver *solv)
333 if (!solv->weakrulemap.size)
335 for (i = 1, r = solv->rules + i; i < solv->learntrules; i++, r++)
337 if (r->d >= 0) /* already enabled? */
339 if (!MAPTST(&solv->weakrulemap, i))
341 solver_enablerule(solv, r);
343 /* make sure broken orphan rules stay disabled */
344 if (solv->brokenorphanrules)
345 for (i = 0; i < solv->brokenorphanrules->count; i++)
346 solver_disablerule(solv, solv->rules + solv->brokenorphanrules->elements[i]);
350 /*-------------------------------------------------------------------
354 * at this point, all rules that led to conflicts are disabled.
355 * we re-enable all rules of a problem set but rule "sug", then
356 * continue to disable more rules until there as again a solution.
359 /* FIXME: think about conflicting assertions */
362 refine_suggestion(Solver *solv, Id *problem, Id sug, Queue *refined, int essentialok)
364 Pool *pool = solv->pool;
370 IF_POOLDEBUG (SOLV_DEBUG_SOLUTIONS)
372 POOL_DEBUG(SOLV_DEBUG_SOLUTIONS, "refine_suggestion start\n");
373 for (i = 0; problem[i]; i++)
375 if (problem[i] == sug)
376 POOL_DEBUG(SOLV_DEBUG_SOLUTIONS, "=> ");
377 solver_printproblem(solv, problem[i]);
380 queue_empty(refined);
381 if (!essentialok && sug < 0 && (solv->job.elements[-sug - 1] & SOLVER_ESSENTIAL) != 0)
383 queue_push(refined, sug);
385 /* re-enable all problem rules with the exception of "sug"(gestion) */
388 for (i = 0; problem[i]; i++)
389 if (problem[i] != sug)
390 solver_enableproblem(solv, problem[i]);
392 solver_reenablepolicyrules(solv, -sug);
394 /* here is where the feature rules come into play: if we disabled an
395 * update rule, we enable the corresponding feature rule if there is
396 * one. We do this to make the solver downgrade packages instead of
397 * deinstalling them */
398 if (sug >= solv->updaterules && sug < solv->updaterules_end)
400 /* enable feature rule */
401 Rule *r = solv->rules + solv->featurerules + (sug - solv->updaterules);
403 solver_enablerule(solv, r);
406 enableweakrules(solv);
408 /* disabled contains all of the rules we disabled in the refinement process */
409 queue_init(&disabled);
412 int nother, nfeature, nupdate, pass;
413 queue_empty(&solv->problems);
415 /* we set disablerules to zero because we are only interested in
416 * the first problem and we don't want the solver to disable the problems */
417 solver_run_sat(solv, 0, 0);
419 if (!solv->problems.count)
421 POOL_DEBUG(SOLV_DEBUG_SOLUTIONS, "no more problems!\n");
422 break; /* great, no more problems */
424 disabledcnt = disabled.count;
425 nother = nfeature = nupdate = 0;
426 for (pass = 0; pass < 2; pass++)
428 /* start with 1 to skip over proof index */
429 for (i = 1; i < solv->problems.count - 1; i++)
431 /* ignore solutions in refined */
432 v = solv->problems.elements[i];
434 break; /* end of problem reached */
435 if (!essentialok && v < 0 && (solv->job.elements[-v - 1] & SOLVER_ESSENTIAL) != 0)
436 continue; /* not that one! */
439 /* check if v is in the given problems list
440 * we allow disabling all problem rules *after* sug in
441 * pass 2, to prevent getting the same solution twice */
442 for (j = 0; problem[j]; j++)
443 if (problem[j] == v || (pass && problem[j] == sug))
448 if (v >= solv->featurerules && v < solv->featurerules_end)
450 else if (v > solv->updaterules && v < solv->updaterules_end)
454 queue_push(&disabled, v);
456 if (disabled.count != disabledcnt)
459 if (disabled.count == disabledcnt)
461 /* no solution found, this was an invalid suggestion! */
462 POOL_DEBUG(SOLV_DEBUG_SOLUTIONS, "no solution found!\n");
466 if (!nother && nupdate && nfeature)
468 /* got only update rules, filter out feature rules */
469 POOL_DEBUG(SOLV_DEBUG_SOLUTIONS, "throwing away feature rules\n");
470 for (i = j = disabledcnt; i < disabled.count; i++)
472 v = disabled.elements[i];
473 if (v < solv->featurerules || v >= solv->featurerules_end)
474 disabled.elements[j++] = v;
479 if (disabled.count == disabledcnt + 1)
481 /* just one suggestion, add it to refined list */
482 v = disabled.elements[disabledcnt];
483 if (!nfeature && v != sug)
484 queue_push(refined, v); /* do not record feature rules */
485 solver_disableproblem(solv, v);
487 solver_reenablepolicyrules(solv, -v);
488 if (v >= solv->updaterules && v < solv->updaterules_end)
490 Rule *r = solv->rules + (v - solv->updaterules + solv->featurerules);
492 solver_enablerule(solv, r); /* enable corresponding feature rule */
497 /* more than one solution, disable all */
498 /* do not push anything on refine list, as we do not know which solution to choose */
499 /* thus, the user will get another problem if he selects this solution, where he
500 * can choose the right one */
501 IF_POOLDEBUG (SOLV_DEBUG_SOLUTIONS)
503 POOL_DEBUG(SOLV_DEBUG_SOLUTIONS, "more than one solution found:\n");
504 for (i = disabledcnt; i < disabled.count; i++)
505 solver_printproblem(solv, disabled.elements[i]);
507 for (i = disabledcnt; i < disabled.count; i++)
509 v = disabled.elements[i];
510 solver_disableproblem(solv, v);
511 if (v >= solv->updaterules && v < solv->updaterules_end)
513 Rule *r = solv->rules + (v - solv->updaterules + solv->featurerules);
515 solver_enablerule(solv, r);
520 /* all done, get us back into the same state as before */
521 /* enable refined rules again */
522 for (i = 0; i < disabled.count; i++)
523 solver_enableproblem(solv, disabled.elements[i]);
524 queue_free(&disabled);
526 /* reset policy rules */
527 for (i = 0; problem[i]; i++)
528 solver_enableproblem(solv, problem[i]);
529 solver_disablepolicyrules(solv);
530 /* disable problem rules again */
531 for (i = 0; problem[i]; i++)
532 solver_disableproblem(solv, problem[i]);
533 POOL_DEBUG(SOLV_DEBUG_SOLUTIONS, "refine_suggestion end\n");
537 /*-------------------------------------------------------------------
538 * sorting helper for problems
540 * bring update rules before job rules
541 * make essential job rules last
545 problems_sortcmp(const void *ap, const void *bp, void *dp)
548 Id a = *(Id *)ap, b = *(Id *)bp;
555 int af = job->elements[-a - 1] & SOLVER_ESSENTIAL;
556 int bf = job->elements[-b - 1] & SOLVER_ESSENTIAL;
565 * convert a solution rule into a job modifier
568 convertsolution(Solver *solv, Id why, Queue *solutionq)
570 Pool *pool = solv->pool;
574 if (why < solv->pooljobcnt)
576 queue_push(solutionq, SOLVER_SOLUTION_POOLJOB);
577 queue_push(solutionq, why);
581 queue_push(solutionq, SOLVER_SOLUTION_JOB);
582 queue_push(solutionq, why - solv->pooljobcnt);
586 if (why >= solv->infarchrules && why < solv->infarchrules_end)
589 /* infarch rule, find replacement */
590 assert(solv->rules[why].p < 0);
591 name = pool->solvables[-solv->rules[why].p].name;
592 while (why > solv->infarchrules && pool->solvables[-solv->rules[why - 1].p].name == name)
595 for (; why < solv->infarchrules_end && pool->solvables[-solv->rules[why].p].name == name; why++)
596 if (solv->decisionmap[-solv->rules[why].p] > 0)
598 p = -solv->rules[why].p;
602 return; /* false alarm */
603 queue_push(solutionq, SOLVER_SOLUTION_INFARCH);
604 queue_push(solutionq, p);
607 if (why >= solv->duprules && why < solv->duprules_end)
610 /* dist upgrade rule, find replacement */
611 assert(solv->rules[why].p < 0);
612 name = pool->solvables[-solv->rules[why].p].name;
613 while (why > solv->duprules && pool->solvables[-solv->rules[why - 1].p].name == name)
616 for (; why < solv->duprules_end && pool->solvables[-solv->rules[why].p].name == name; why++)
617 if (solv->decisionmap[-solv->rules[why].p] > 0)
619 p = -solv->rules[why].p;
623 return; /* false alarm */
624 queue_push(solutionq, SOLVER_SOLUTION_DISTUPGRADE);
625 queue_push(solutionq, p);
628 if (why >= solv->updaterules && why < solv->updaterules_end)
630 /* update rule, find replacement package */
634 /* check if this is a false positive, i.e. the update rule is fulfilled */
635 rr = solv->rules + why;
636 FOR_RULELITERALS(p, pp, rr)
637 if (p > 0 && solv->decisionmap[p] > 0)
638 return; /* false alarm */
640 p = solv->installed->start + (why - solv->updaterules);
641 if (solv->decisionmap[p] > 0)
642 return; /* false alarm, turned out we can keep the package */
643 rr = solv->rules + solv->featurerules + (why - solv->updaterules);
645 rr = solv->rules + why;
648 int mvrp = 0; /* multi-version replacement */
649 FOR_RULELITERALS(rp, pp, rr)
651 if (rp > 0 && solv->decisionmap[rp] > 0 && pool->solvables[rp].repo != solv->installed)
654 if (!(solv->multiversion.size && MAPTST(&solv->multiversion, rp)))
660 /* found only multi-version replacements */
661 /* have to split solution into two parts */
662 queue_push(solutionq, p);
663 queue_push(solutionq, mvrp);
666 queue_push(solutionq, p);
667 queue_push(solutionq, rp);
670 if (why >= solv->bestrules && why < solv->bestrules_end)
675 /* check false positive */
676 rr = solv->rules + why;
677 FOR_RULELITERALS(p, pp, rr)
678 if (p > 0 && solv->decisionmap[p] > 0)
679 return; /* false alarm */
680 /* check update/feature rule */
681 p = solv->bestrules_info[why - solv->bestrules];
685 queue_push(solutionq, 0);
686 queue_push(solutionq, solv->ruletojob.elements[-p - solv->jobrules] + 1);
689 if (solv->decisionmap[p] > 0)
691 /* disable best rule by keeping the old package */
692 queue_push(solutionq, SOLVER_SOLUTION_BEST);
693 queue_push(solutionq, p);
696 rr = solv->rules + solv->featurerules + (p - solv->installed->start);
698 rr = solv->rules + solv->updaterules + (p - solv->installed->start);
699 mvrp = 0; /* multi-version replacement */
700 FOR_RULELITERALS(rp, pp, rr)
701 if (rp > 0 && solv->decisionmap[rp] > 0 && pool->solvables[rp].repo != solv->installed)
704 if (!(solv->multiversion.size && MAPTST(&solv->multiversion, rp)))
709 queue_push(solutionq, SOLVER_SOLUTION_BEST); /* split, see above */
710 queue_push(solutionq, mvrp);
711 queue_push(solutionq, p);
712 queue_push(solutionq, 0);
717 queue_push(solutionq, SOLVER_SOLUTION_BEST);
718 queue_push(solutionq, rp);
722 if (why >= solv->blackrules && why < solv->blackrules_end)
724 queue_push(solutionq, SOLVER_SOLUTION_BLACK);
725 assert(solv->rules[why].p < 0);
726 queue_push(solutionq, -solv->rules[why].p);
728 if (why >= solv->strictrepopriorules && why < solv->strictrepopriorules_end)
730 queue_push(solutionq, SOLVER_SOLUTION_STRICTREPOPRIORITY);
731 assert(solv->rules[why].p < 0);
732 queue_push(solutionq, -solv->rules[why].p);
737 * convert problem data into a form usable for refining.
738 * Returns the number of problems.
741 solver_prepare_solutions(Solver *solv)
745 if (!solv->problems.count)
747 queue_empty(&solv->solutions);
748 queue_push(&solv->solutions, 0); /* dummy so idx is always nonzero */
749 idx = solv->solutions.count;
750 queue_push(&solv->solutions, -1); /* unrefined */
751 /* proofidx stays in position, thus we start with 1 */
752 for (i = 1; i < solv->problems.count; i++)
754 Id p = solv->problems.elements[i];
755 queue_push(&solv->solutions, p);
758 /* end of problem reached */
759 solv->problems.elements[j++] = idx;
760 if (i + 1 >= solv->problems.count)
762 /* start another problem */
763 solv->problems.elements[j++] = solv->problems.elements[++i]; /* copy proofidx */
764 idx = solv->solutions.count;
765 queue_push(&solv->solutions, -1); /* unrefined */
767 solv->problems.count = j;
772 * refine the simple solution rule list provided by
773 * the solver into multiple lists of job modifiers.
776 create_solutions(Solver *solv, int probnr, int solidx)
778 Pool *pool = solv->pool;
780 Queue problem, solution, problems_save, branches_save, decisionq_reason_save;
784 int oldmistakes = solv->cleandeps_mistakes ? solv->cleandeps_mistakes->count : 0;
787 now = solv_timems(0);
789 /* save decisionq, decisionq_why, decisionmap, and decisioncnt */
790 for (i = 0; i < solv->decisionq.count; i++)
792 Id p = solv->decisionq.elements[i];
793 queue_push(&redoq, p);
794 queue_push(&redoq, solv->decisionq_why.elements[i]);
795 queue_push(&redoq, solv->decisionmap[p > 0 ? p : -p]);
798 /* save problems queue */
799 problems_save = solv->problems;
800 memset(&solv->problems, 0, sizeof(solv->problems));
802 /* save branches queue */
803 branches_save = solv->branches;
804 memset(&solv->branches, 0, sizeof(solv->branches));
806 /* save decisionq_reason */
807 decisionq_reason_save = solv->decisionq_reason;
808 memset(&solv->decisionq_reason, 0, sizeof(solv->decisionq_reason));
810 /* extract problem from queue */
811 queue_init(&problem);
812 for (i = solidx + 1; i < solv->solutions.count; i++)
814 Id v = solv->solutions.elements[i];
817 queue_push(&problem, v);
819 extraflags &= solv->job.elements[-v - 1];
821 if (extraflags == -1)
823 if (problem.count > 1)
824 solv_sort(problem.elements, problem.count, sizeof(Id), problems_sortcmp, &solv->job);
825 queue_push(&problem, 0); /* mark end for refine_suggestion */
828 for (i = 0; i < problem.count; i++)
829 printf("PP %d %d\n", i, problem.elements[i]);
832 /* refine each solution element */
835 queue_init(&solution);
836 for (i = 0; i < problem.count; i++)
838 int solstart = solv->solutions.count;
839 refine_suggestion(solv, problem.elements, problem.elements[i], &solution, essentialok);
840 queue_push(&solv->solutions, 0); /* reserve room for number of elements */
841 for (j = 0; j < solution.count; j++)
842 convertsolution(solv, solution.elements[j], &solv->solutions);
843 if (solv->solutions.count == solstart + 1)
845 solv->solutions.count--; /* this one did not work out */
846 if (nsol || i + 1 < problem.count)
847 continue; /* got one or still hope */
850 /* nothing found, start over */
851 POOL_DEBUG(SOLV_DEBUG_SOLUTIONS, "nothing found, re-run with essentialok = 1\n");
856 /* this is bad, we found no solution */
857 /* for now just offer a rule */
858 POOL_DEBUG(SOLV_DEBUG_SOLUTIONS, "nothing found, already did essentialok, fake it\n");
859 queue_push(&solv->solutions, 0);
860 for (j = 0; j < problem.count; j++)
862 convertsolution(solv, problem.elements[j], &solv->solutions);
863 if (solv->solutions.count > solstart + 1)
866 if (solv->solutions.count == solstart + 1)
868 solv->solutions.count--;
869 continue; /* sorry */
872 /* patch in number of solution elements */
873 solv->solutions.elements[solstart] = (solv->solutions.count - (solstart + 1)) / 2;
874 queue_push(&solv->solutions, 0); /* add end marker */
875 queue_push(&solv->solutions, 0); /* add end marker */
876 queue_push(&solv->solutions, problem.elements[i]); /* just for bookkeeping */
877 queue_push(&solv->solutions, extraflags & SOLVER_CLEANDEPS); /* our extraflags */
878 solv->solutions.elements[solidx + 1 + nsol++] = solstart;
880 solv->solutions.elements[solidx + 1 + nsol] = 0; /* end marker */
881 solv->solutions.elements[solidx] = nsol;
882 queue_free(&problem);
883 queue_free(&solution);
885 /* restore decisions */
886 memset(solv->decisionmap, 0, pool->nsolvables * sizeof(Id));
887 queue_empty(&solv->decisionq);
888 queue_empty(&solv->decisionq_why);
889 for (i = 0; i < redoq.count; i += 3)
891 Id p = redoq.elements[i];
892 queue_push(&solv->decisionq, p);
893 queue_push(&solv->decisionq_why, redoq.elements[i + 1]);
894 solv->decisionmap[p > 0 ? p : -p] = redoq.elements[i + 2];
898 /* restore decision reasons */
899 queue_free(&solv->decisionq_reason);
900 solv->decisionq_reason = decisionq_reason_save;
902 /* restore problems */
903 queue_free(&solv->problems);
904 solv->problems = problems_save;
906 /* restore branches */
907 queue_free(&solv->branches);
908 solv->branches = branches_save;
910 if (solv->cleandeps_mistakes)
913 queue_truncate(solv->cleandeps_mistakes, oldmistakes);
916 queue_free(solv->cleandeps_mistakes);
917 solv->cleandeps_mistakes = solv_free(solv->cleandeps_mistakes);
921 POOL_DEBUG(SOLV_DEBUG_STATS, "create_solutions for problem #%d took %d ms\n", probnr, solv_timems(now));
925 /**************************************************************************/
928 solver_problem_count(Solver *solv)
930 return solv->problems.count / 2;
934 solver_next_problem(Solver *solv, Id problem)
937 return solv->problems.count ? 1 : 0;
938 return (problem + 1) * 2 - 1 < solv->problems.count ? problem + 1 : 0;
942 solver_solution_count(Solver *solv, Id problem)
944 Id solidx = solv->problems.elements[problem * 2 - 1];
945 if (solv->solutions.elements[solidx] < 0)
946 create_solutions(solv, problem, solidx);
947 return solv->solutions.elements[solidx];
951 solver_next_solution(Solver *solv, Id problem, Id solution)
953 Id solidx = solv->problems.elements[problem * 2 - 1];
954 if (solv->solutions.elements[solidx] < 0)
955 create_solutions(solv, problem, solidx);
956 return solv->solutions.elements[solidx + solution + 1] ? solution + 1 : 0;
960 solver_solutionelement_count(Solver *solv, Id problem, Id solution)
962 Id solidx = solv->problems.elements[problem * 2 - 1];
963 solidx = solv->solutions.elements[solidx + solution];
964 return solv->solutions.elements[solidx];
968 solver_solutionelement_internalid(Solver *solv, Id problem, Id solution)
970 Id solidx = solv->problems.elements[problem * 2 - 1];
971 solidx = solv->solutions.elements[solidx + solution];
972 return solv->solutions.elements[solidx + 2 * solv->solutions.elements[solidx] + 3];
976 solver_solutionelement_extrajobflags(Solver *solv, Id problem, Id solution)
978 Id solidx = solv->problems.elements[problem * 2 - 1];
979 solidx = solv->solutions.elements[solidx + solution];
980 return solv->solutions.elements[solidx + 2 * solv->solutions.elements[solidx] + 4];
985 * return the next item of the proposed solution
986 * here are the possibilities for p / rp and what
987 * the solver expects the application to do:
989 * -------------------------------------------------------
990 * SOLVER_SOLUTION_INFARCH pkgid
991 * -> add (SOLVER_INSTALL|SOLVER_SOLVABLE, rp) to the job
992 * SOLVER_SOLUTION_DISTUPGRADE pkgid
993 * -> add (SOLVER_INSTALL|SOLVER_SOLVABLE, rp) to the job
994 * SOLVER_SOLUTION_BEST pkgid
995 * -> add (SOLVER_INSTALL|SOLVER_SOLVABLE, rp) to the job
996 * SOLVER_SOLUTION_BLACK pkgid
997 * -> add (SOLVER_INSTALL|SOLVER_SOLVABLE, rp) to the job
998 * SOLVER_SOLUTION_JOB jobidx
999 * -> remove job (jobidx - 1, jobidx) from job queue
1000 * SOLVER_SOLUTION_POOLJOB jobidx
1001 * -> remove job (jobidx - 1, jobidx) from pool job queue
1003 * -> add (SOLVER_ERASE|SOLVER_SOLVABLE, p) to the job
1004 * pkgid (> 0) pkgid (> 0)
1005 * -> add (SOLVER_INSTALL|SOLVER_SOLVABLE, rp) to the job
1006 * (this will replace package p)
1008 * Thus, the solver will either ask the application to remove
1009 * a specific job from the job queue, or ask to add an install/erase
1015 solver_next_solutionelement(Solver *solv, Id problem, Id solution, Id element, Id *p, Id *rp)
1017 Id solidx = solv->problems.elements[problem * 2 - 1];
1018 solidx = solv->solutions.elements[solidx + solution];
1021 solidx += 1 + element * 2;
1022 if (!solv->solutions.elements[solidx] && !solv->solutions.elements[solidx + 1])
1024 *p = solv->solutions.elements[solidx];
1025 *rp = solv->solutions.elements[solidx + 1];
1030 solver_take_solutionelement(Solver *solv, Id p, Id rp, Id extrajobflags, Queue *job)
1034 if (p == SOLVER_SOLUTION_POOLJOB)
1036 solv->pool->pooljobs.elements[rp - 1] = SOLVER_NOOP;
1037 solv->pool->pooljobs.elements[rp] = 0;
1040 if (p == SOLVER_SOLUTION_JOB)
1042 job->elements[rp - 1] = SOLVER_NOOP;
1043 job->elements[rp] = 0;
1046 if (rp <= 0 && p <= 0)
1047 return; /* just in case */
1049 p = SOLVER_INSTALL|SOLVER_SOLVABLE|SOLVER_NOTBYUSER|extrajobflags;
1053 p = SOLVER_ERASE|SOLVER_SOLVABLE|extrajobflags;
1055 for (i = 0; i < job->count; i += 2)
1056 if (job->elements[i] == p && job->elements[i + 1] == rp)
1058 queue_push2(job, p, rp);
1062 solver_take_solution(Solver *solv, Id problem, Id solution, Queue *job)
1064 Id p, rp, element = 0;
1065 Id extrajobflags = solver_solutionelement_extrajobflags(solv, problem, solution);
1066 while ((element = solver_next_solutionelement(solv, problem, solution, element, &p, &rp)) != 0)
1067 solver_take_solutionelement(solv, p, rp, extrajobflags, job);
1071 /*-------------------------------------------------------------------
1077 findproblemrule_internal(Solver *solv, Id idx, Id *reqrp, Id *conrp, Id *sysrp, Id *jobrp, Id *blkrp, Id *scprp, Map *rseen)
1080 Id lreqr, lconr, lsysr, ljobr, lblkr, lscpr;
1083 int i, reqset = 0; /* 0: unset, 1: installed, 2: jobassert, 3: assert */
1084 int conset = 0; /* 0: unset, 1: installed */
1086 /* find us a jobassert rule */
1087 for (i = idx; (rid = solv->learnt_pool.elements[i]) != 0; i++)
1089 if (rid < solv->jobrules || rid >= solv->jobrules_end)
1091 r = solv->rules + rid;
1092 d = r->d < 0 ? -r->d - 1 : r->d;
1093 if (!d && r->w2 == 0 && r->p > 0)
1100 /* the problem rules are somewhat ordered from "near to the problem" to
1101 * "near to the job" */
1102 lreqr = lconr = lsysr = ljobr = lblkr = lscpr = 0;
1103 while ((rid = solv->learnt_pool.elements[idx++]) != 0)
1106 if (rid >= solv->learntrules)
1108 if (MAPTST(rseen, rid - solv->learntrules))
1110 MAPSET(rseen, rid - solv->learntrules);
1111 findproblemrule_internal(solv, solv->learnt_why.elements[rid - solv->learntrules], &lreqr, &lconr, &lsysr, &ljobr, &lblkr, &lscpr, rseen);
1113 else if ((rid >= solv->jobrules && rid < solv->jobrules_end) || (rid >= solv->infarchrules && rid < solv->infarchrules_end) || (rid >= solv->duprules && rid < solv->duprules_end) || (rid >= solv->bestrules && rid < solv->bestrules_end) || (rid >= solv->yumobsrules && rid < solv->yumobsrules_end))
1118 else if (rid >= solv->updaterules && rid < solv->updaterules_end)
1123 else if (rid >= solv->blackrules && rid < solv->blackrules_end)
1128 else if (rid >= solv->strictrepopriorules && rid < solv->strictrepopriorules_end)
1135 assert(rid < solv->pkgrules_end);
1136 r = solv->rules + rid;
1137 d = r->d < 0 ? -r->d - 1 : r->d;
1138 if (!d && r->w2 < 0)
1140 /* prefer conflicts of installed packages */
1141 if (solv->installed && !conset)
1143 if (r->p < 0 && (solv->pool->solvables[-r->p].repo == solv->installed ||
1144 solv->pool->solvables[-r->w2].repo == solv->installed))
1155 if (!d && r->w2 == 0 && reqset < 3)
1157 if (*reqrp > 0 && r->p < -1)
1159 Pool *pool = solv->pool;
1160 Id op = -solv->rules[*reqrp].p;
1161 if (op > 1 && pool->solvables[op].arch != pool->solvables[-r->p].arch &&
1162 pool->solvables[-r->p].arch != pool->noarchid)
1163 continue; /* different arch, skip */
1165 /* prefer assertions */
1169 else if (jobassert && r->p == -jobassert)
1171 /* prefer rules of job assertions */
1175 else if (solv->installed && r->p < 0 && solv->pool->solvables[-r->p].repo == solv->installed && reqset <= 1)
1177 /* prefer rules of job installed package so that the user doesn't get confused by strange packages */
1186 if (!*reqrp && lreqr)
1188 if (!*conrp && lconr)
1190 if (!*jobrp && ljobr)
1192 if (!*sysrp && lsysr)
1194 if (!*blkrp && lblkr)
1196 if (!*scprp && lscpr)
1203 * search for a rule that describes the problem to the
1204 * user. Actually a pretty hopeless task that may leave the user
1205 * puzzled. To get all of the needed information use
1206 * solver_findallproblemrules() instead.
1210 solver_findproblemrule(Solver *solv, Id problem)
1212 Id reqr, conr, sysr, jobr, blkr, srpr;
1213 Id idx = solv->problems.elements[2 * problem - 2];
1215 reqr = conr = sysr = jobr = blkr = srpr = 0;
1216 map_init(&rseen, solv->learntrules ? solv->nrules - solv->learntrules : 0);
1217 findproblemrule_internal(solv, idx, &reqr, &conr, &sysr, &jobr, &blkr, &srpr, &rseen);
1219 /* check if the request is about a not-installed package requiring a installed
1220 * package conflicting with the non-installed package. In that case return the conflict */
1221 if (reqr && conr && solv->installed && solv->rules[reqr].p < 0 && solv->rules[conr].p < 0 && solv->rules[conr].w2 < 0)
1223 Pool *pool = solv->pool;
1224 Solvable *s = pool->solvables - solv->rules[reqr].p;
1225 Solvable *s1 = pool->solvables - solv->rules[conr].p;
1226 Solvable *s2 = pool->solvables - solv->rules[conr].w2;
1228 if (s == s1 && s2->repo == solv->installed)
1229 cp = -solv->rules[conr].w2;
1230 else if (s == s2 && s1->repo == solv->installed)
1231 cp = -solv->rules[conr].p;
1232 if (cp && s1->name != s2->name && s->repo != solv->installed)
1235 Rule *r = solv->rules + reqr;
1236 FOR_RULELITERALS(p, pp, r)
1242 return reqr; /* some requires */
1244 return conr; /* some conflict */
1246 return blkr; /* a blacklisted package */
1248 return srpr; /* a strict repo priority */
1250 return sysr; /* an update rule */
1252 return jobr; /* a user request */
1257 /*-------------------------------------------------------------------*/
1260 findallproblemrules_internal(Solver *solv, Id idx, Queue *rules, Map *rseen)
1263 while ((rid = solv->learnt_pool.elements[idx++]) != 0)
1265 if (rid >= solv->learntrules)
1267 if (MAPTST(rseen, rid - solv->learntrules))
1269 MAPSET(rseen, rid - solv->learntrules);
1270 findallproblemrules_internal(solv, solv->learnt_why.elements[rid - solv->learntrules], rules, rseen);
1273 queue_pushunique(rules, rid);
1278 * find all problem rule
1280 * return all rules that lead to the problem. This gives the user
1281 * all of the information to understand the problem, but the result
1282 * can be a large number of rules.
1286 solver_findallproblemrules(Solver *solv, Id problem, Queue *rules)
1290 map_init(&rseen, solv->learntrules ? solv->nrules - solv->learntrules : 0);
1291 findallproblemrules_internal(solv, solv->problems.elements[2 * problem - 2], rules, &rseen);
1296 solver_problemruleinfo2str(Solver *solv, SolverRuleinfo type, Id source, Id target, Id dep)
1298 Pool *pool = solv->pool;
1303 case SOLVER_RULE_DISTUPGRADE:
1304 return pool_tmpjoin(pool, pool_solvid2str(pool, source), " does not belong to a distupgrade repository", 0);
1305 case SOLVER_RULE_INFARCH:
1306 return pool_tmpjoin(pool, pool_solvid2str(pool, source), " has inferior architecture", 0);
1307 case SOLVER_RULE_UPDATE:
1308 return pool_tmpjoin(pool, "problem with installed package ", pool_solvid2str(pool, source), 0);
1309 case SOLVER_RULE_JOB:
1310 return "conflicting requests";
1311 case SOLVER_RULE_JOB_UNSUPPORTED:
1312 return "unsupported request";
1313 case SOLVER_RULE_JOB_NOTHING_PROVIDES_DEP:
1314 return pool_tmpjoin(pool, "nothing provides requested ", pool_dep2str(pool, dep), 0);
1315 case SOLVER_RULE_JOB_UNKNOWN_PACKAGE:
1316 return pool_tmpjoin(pool, "package ", pool_dep2str(pool, dep), " does not exist");
1317 case SOLVER_RULE_JOB_PROVIDED_BY_SYSTEM:
1318 return pool_tmpjoin(pool, pool_dep2str(pool, dep), " is provided by the system", 0);
1319 case SOLVER_RULE_PKG:
1320 return "some dependency problem";
1321 case SOLVER_RULE_BEST:
1323 return pool_tmpjoin(pool, "cannot install the best update candidate for package ", pool_solvid2str(pool, source), 0);
1324 return "cannot install the best candidate for the job";
1325 case SOLVER_RULE_PKG_NOT_INSTALLABLE:
1326 ss = pool->solvables + source;
1327 if (pool_disabled_solvable(pool, ss))
1328 return pool_tmpjoin(pool, "package ", pool_solvid2str(pool, source), " is disabled");
1329 if (ss->arch && ss->arch != ARCH_SRC && ss->arch != ARCH_NOSRC &&
1330 pool->id2arch && pool_arch2score(pool, ss->arch) == 0)
1331 return pool_tmpjoin(pool, "package ", pool_solvid2str(pool, source), " does not have a compatible architecture");
1332 return pool_tmpjoin(pool, "package ", pool_solvid2str(pool, source), " is not installable");
1333 case SOLVER_RULE_PKG_NOTHING_PROVIDES_DEP:
1334 s = pool_tmpjoin(pool, "nothing provides ", pool_dep2str(pool, dep), 0);
1335 return pool_tmpappend(pool, s, " needed by ", pool_solvid2str(pool, source));
1336 case SOLVER_RULE_PKG_SAME_NAME:
1337 s = pool_tmpjoin(pool, "cannot install both ", pool_solvid2str(pool, source), 0);
1338 return pool_tmpappend(pool, s, " and ", pool_solvid2str(pool, target));
1339 case SOLVER_RULE_PKG_CONFLICTS:
1340 s = pool_tmpjoin(pool, "package ", pool_solvid2str(pool, source), 0);
1341 s = pool_tmpappend(pool, s, " conflicts with ", pool_dep2str(pool, dep));
1342 return pool_tmpappend(pool, s, " provided by ", pool_solvid2str(pool, target));
1343 case SOLVER_RULE_PKG_OBSOLETES:
1344 s = pool_tmpjoin(pool, "package ", pool_solvid2str(pool, source), 0);
1345 s = pool_tmpappend(pool, s, " obsoletes ", pool_dep2str(pool, dep));
1346 return pool_tmpappend(pool, s, " provided by ", pool_solvid2str(pool, target));
1347 case SOLVER_RULE_PKG_INSTALLED_OBSOLETES:
1348 s = pool_tmpjoin(pool, "installed package ", pool_solvid2str(pool, source), 0);
1349 s = pool_tmpappend(pool, s, " obsoletes ", pool_dep2str(pool, dep));
1350 return pool_tmpappend(pool, s, " provided by ", pool_solvid2str(pool, target));
1351 case SOLVER_RULE_PKG_IMPLICIT_OBSOLETES:
1352 s = pool_tmpjoin(pool, "package ", pool_solvid2str(pool, source), 0);
1353 s = pool_tmpappend(pool, s, " implicitly obsoletes ", pool_dep2str(pool, dep));
1354 return pool_tmpappend(pool, s, " provided by ", pool_solvid2str(pool, target));
1355 case SOLVER_RULE_PKG_REQUIRES:
1356 s = pool_tmpjoin(pool, "package ", pool_solvid2str(pool, source), " requires ");
1357 return pool_tmpappend(pool, s, pool_dep2str(pool, dep), ", but none of the providers can be installed");
1358 case SOLVER_RULE_PKG_SELF_CONFLICT:
1359 s = pool_tmpjoin(pool, "package ", pool_solvid2str(pool, source), " conflicts with ");
1360 return pool_tmpappend(pool, s, pool_dep2str(pool, dep), " provided by itself");
1361 case SOLVER_RULE_YUMOBS:
1362 s = pool_tmpjoin(pool, "both package ", pool_solvid2str(pool, source), " and ");
1363 s = pool_tmpjoin(pool, s, pool_solvid2str(pool, target), " obsolete ");
1364 return pool_tmpappend(pool, s, pool_dep2str(pool, dep), 0);
1365 case SOLVER_RULE_BLACK:
1366 return pool_tmpjoin(pool, "package ", pool_solvid2str(pool, source), " can only be installed by a direct request");
1367 case SOLVER_RULE_STRICT_REPO_PRIORITY:
1368 return pool_tmpjoin(pool, "package ", pool_solvid2str(pool, source), " is excluded by strict repo priority");
1369 case SOLVER_RULE_PKG_CONSTRAINS:
1370 s = pool_tmpjoin(pool, "package ", pool_solvid2str(pool, source), 0);
1371 s = pool_tmpappend(pool, s, " has constraint ", pool_dep2str(pool, dep));
1372 return pool_tmpappend(pool, s, " conflicting with ", pool_solvid2str(pool, target));
1374 return "bad problem rule type";
1378 /* convenience function */
1380 solver_problem2str(Solver *solv, Id problem)
1382 Id type, source, target, dep;
1383 Id r = solver_findproblemrule(solv, problem);
1385 return "no problem rule?";
1386 type = solver_ruleinfo(solv, r, &source, &target, &dep);
1387 return solver_problemruleinfo2str(solv, type, source, target, dep);
1391 solver_solutionelement2str(Solver *solv, Id p, Id rp)
1393 Pool *pool = solv->pool;
1394 if (p == SOLVER_SOLUTION_JOB || p == SOLVER_SOLUTION_POOLJOB)
1397 if (p == SOLVER_SOLUTION_JOB)
1398 rp += solv->pooljobcnt;
1399 how = solv->job.elements[rp - 1];
1400 what = solv->job.elements[rp];
1401 return pool_tmpjoin(pool, "do not ask to ", pool_job2str(pool, how, what, 0), 0);
1403 else if (p == SOLVER_SOLUTION_INFARCH)
1405 Solvable *s = pool->solvables + rp;
1406 if (solv->installed && s->repo == solv->installed)
1407 return pool_tmpjoin(pool, "keep ", pool_solvable2str(pool, s), " despite the inferior architecture");
1409 return pool_tmpjoin(pool, "install ", pool_solvable2str(pool, s), " despite the inferior architecture");
1411 else if (p == SOLVER_SOLUTION_DISTUPGRADE)
1413 Solvable *s = pool->solvables + rp;
1414 if (solv->installed && s->repo == solv->installed)
1415 return pool_tmpjoin(pool, "keep obsolete ", pool_solvable2str(pool, s), 0);
1417 return pool_tmpjoin(pool, "install ", pool_solvable2str(pool, s), " from excluded repository");
1419 else if (p == SOLVER_SOLUTION_BEST)
1421 Solvable *s = pool->solvables + rp;
1422 if (solv->installed && s->repo == solv->installed)
1423 return pool_tmpjoin(pool, "keep old ", pool_solvable2str(pool, s), 0);
1425 return pool_tmpjoin(pool, "install ", pool_solvable2str(pool, s), " despite the old version");
1427 else if (p == SOLVER_SOLUTION_BLACK)
1429 Solvable *s = pool->solvables + rp;
1430 return pool_tmpjoin(pool, "install ", pool_solvable2str(pool, s), 0);
1432 else if (p > 0 && rp == 0)
1433 return pool_tmpjoin(pool, "allow deinstallation of ", pool_solvid2str(pool, p), 0);
1434 else if (p == SOLVER_SOLUTION_STRICTREPOPRIORITY)
1436 Solvable *s = pool->solvables + rp;
1437 return pool_tmpjoin(pool, "install ", pool_solvable2str(pool, s), " despite the repo priority");
1439 else if (p > 0 && rp > 0)
1441 const char *sp = pool_solvid2str(pool, p);
1442 const char *srp = pool_solvid2str(pool, rp);
1443 const char *str = pool_tmpjoin(pool, "allow replacement of ", sp, 0);
1444 return pool_tmpappend(pool, str, " with ", srp);
1447 return "bad solution element";