src/rules.c

   1 /*
   2  * Copyright (c) 2007-2009, Novell Inc.
   3  *
   4  * This program is licensed under the BSD license, read LICENSE.BSD
   5  * for further information
   6  */
   7
   8 /*
   9  * rules.c
  10  *
  11  * SAT based dependency solver
  12  */
  13
  14 #include <stdio.h>
  15 #include <stdlib.h>
  16 #include <unistd.h>
  17 #include <string.h>
  18 #include <assert.h>
  19
  20 #include "solver.h"
  21 #include "bitmap.h"
  22 #include "pool.h"
  23 #include "poolarch.h"
  24 #include "util.h"
  25 #include "policy.h"
  26 #include "solverdebug.h"
  27
  28 #define RULES_BLOCK 63
  29
  30 static void addrpmruleinfo(Solver *solv, Id p, Id d, int type, Id dep);
  31
  32 /*-------------------------------------------------------------------
  33  * Check if dependency is possible
  34  *
  35  * mirrors solver_dep_fulfilled but uses map m instead of the decisionmap
  36  */
  37
  38 static inline int
  39 dep_possible(Solver *solv, Id dep, Map *m)
  40 {
  41   Pool *pool = solv->pool;
  42   Id p, pp;
  43
  44   if (ISRELDEP(dep))
  45     {
  46       Reldep *rd = GETRELDEP(pool, dep);
  47       if (rd->flags == REL_AND)
  48         {
  49           if (!dep_possible(solv, rd->name, m))
  50             return 0;
  51           return dep_possible(solv, rd->evr, m);
  52         }
  53       if (rd->flags == REL_NAMESPACE && rd->name == NAMESPACE_SPLITPROVIDES)
  54         return solver_splitprovides(solv, rd->evr);
  55       if (rd->flags == REL_NAMESPACE && rd->name == NAMESPACE_INSTALLED)
  56         return solver_dep_installed(solv, rd->evr);
  57     }
  58   FOR_PROVIDES(p, pp, dep)
  59     {
  60       if (MAPTST(m, p))
  61         return 1;
  62     }
  63   return 0;
  64 }
  65
  66 /********************************************************************
  67  *
  68  * Rule handling
  69  *
  70  * - unify rules, remove duplicates
  71  */
  72
  73 /*-------------------------------------------------------------------
  74  *
  75  * compare rules for unification sort
  76  *
  77  */
  78
  79 static int
  80 unifyrules_sortcmp(const void *ap, const void *bp, void *dp)
  81 {
  82   Pool *pool = dp;
  83   Rule *a = (Rule *)ap;
  84   Rule *b = (Rule *)bp;
  85   Id *ad, *bd;
  86   int x;
  87
  88   x = a->p - b->p;
  89   if (x)
  90     return x;                          /* p differs */
  91
  92   /* identical p */
  93   if (a->d == 0 && b->d == 0)
  94     return a->w2 - b->w2;              /* assertion: return w2 diff */
  95
  96   if (a->d == 0)                       /* a is assertion, b not */
  97     {
  98       x = a->w2 - pool->whatprovidesdata[b->d];
  99       return x ? x : -1;
 100     }
 101
 102   if (b->d == 0)                       /* b is assertion, a not */
 103     {
 104       x = pool->whatprovidesdata[a->d] - b->w2;
 105       return x ? x : 1;
 106     }
 107
 108   /* compare whatprovidesdata */
 109   ad = pool->whatprovidesdata + a->d;
 110   bd = pool->whatprovidesdata + b->d;
 111   while (*bd)
 112     if ((x = *ad++ - *bd++) != 0)
 113       return x;
 114   return *ad;
 115 }
 116
 117 int
 118 solver_samerule(Solver *solv, Rule *r1, Rule *r2)
 119 {
 120   return unifyrules_sortcmp(r1, r2, solv->pool);
 121 }
 122
 123
 124 /*-------------------------------------------------------------------
 125  *
 126  * unify rules
 127  * go over all rules and remove duplicates
 128  */
 129
 130 void
 131 solver_unifyrules(Solver *solv)
 132 {
 133   Pool *pool = solv->pool;
 134   int i, j;
 135   Rule *ir, *jr;
 136
 137   if (solv->nrules <= 1)               /* nothing to unify */
 138     return;
 139
 140   POOL_DEBUG(SAT_DEBUG_SCHUBI, "----- unifyrules -----\n");
 141
 142   /* sort rules first */
 143   sat_sort(solv->rules + 1, solv->nrules - 1, sizeof(Rule), unifyrules_sortcmp, solv->pool);
 144
 145   /* prune rules
 146    * i = unpruned
 147    * j = pruned
 148    */
 149   jr = 0;
 150   for (i = j = 1, ir = solv->rules + i; i < solv->nrules; i++, ir++)
 151     {
 152       if (jr && !unifyrules_sortcmp(ir, jr, pool))
 153         continue;                      /* prune! */
 154       jr = solv->rules + j++;          /* keep! */
 155       if (ir != jr)
 156         *jr = *ir;
 157     }
 158
 159   /* reduced count from nrules to j rules */
 160   POOL_DEBUG(SAT_DEBUG_STATS, "pruned rules from %d to %d\n", solv->nrules, j);
 161
 162   /* adapt rule buffer */
 163   solv->nrules = j;
 164   solv->rules = sat_extend_resize(solv->rules, solv->nrules, sizeof(Rule), RULES_BLOCK);
 165
 166   /*
 167    * debug: log rule statistics
 168    */
 169   IF_POOLDEBUG (SAT_DEBUG_STATS)
 170     {
 171       int binr = 0;
 172       int lits = 0;
 173       Id *dp;
 174       Rule *r;
 175
 176       for (i = 1; i < solv->nrules; i++)
 177         {
 178           r = solv->rules + i;
 179           if (r->d == 0)
 180             binr++;
 181           else
 182             {
 183               dp = solv->pool->whatprovidesdata + r->d;
 184               while (*dp++)
 185                 lits++;
 186             }
 187         }
 188       POOL_DEBUG(SAT_DEBUG_STATS, "  binary: %d\n", binr);
 189       POOL_DEBUG(SAT_DEBUG_STATS, "  normal: %d, %d literals\n", solv->nrules - 1 - binr, lits);
 190     }
 191   POOL_DEBUG(SAT_DEBUG_SCHUBI, "----- unifyrules end -----\n");
 192 }
 193
 194 #if 0
 195
 196 /*
 197  * hash rule
 198  */
 199
 200 static Hashval
 201 hashrule(Solver *solv, Id p, Id d, int n)
 202 {
 203   unsigned int x = (unsigned int)p;
 204   int *dp;
 205
 206   if (n <= 1)
 207     return (x * 37) ^ (unsigned int)d;
 208   dp = solv->pool->whatprovidesdata + d;
 209   while (*dp)
 210     x = (x * 37) ^ (unsigned int)*dp++;
 211   return x;
 212 }
 213 #endif
 214
 215
 216 /*-------------------------------------------------------------------
 217  *
 218  */
 219
 220 /*
 221  * add rule
 222  *  p = direct literal; always < 0 for installed rpm rules
 223  *  d, if < 0 direct literal, if > 0 offset into whatprovides, if == 0 rule is assertion (look at p only)
 224  *
 225  *
 226  * A requires b, b provided by B1,B2,B3 => (-A|B1|B2|B3)
 227  *
 228  * p < 0 : pkg id of A
 229  * d > 0 : Offset in whatprovidesdata (list of providers of b)
 230  *
 231  * A conflicts b, b provided by B1,B2,B3 => (-A|-B1), (-A|-B2), (-A|-B3)
 232  * p < 0 : pkg id of A
 233  * d < 0 : Id of solvable (e.g. B1)
 234  *
 235  * d == 0: unary rule, assertion => (A) or (-A)
 236  *
 237  *   Install:    p > 0, d = 0   (A)             user requested install
 238  *   Remove:     p < 0, d = 0   (-A)            user requested remove (also: uninstallable)
 239  *   Requires:   p < 0, d > 0   (-A|B1|B2|...)  d: <list of providers for requirement of p>
 240  *   Updates:    p > 0, d > 0   (A|B1|B2|...)   d: <list of updates for solvable p>
 241  *   Conflicts:  p < 0, d < 0   (-A|-B)         either p (conflict issuer) or d (conflict provider) (binary rule)
 242  *                                              also used for obsoletes
 243  *   ?:          p > 0, d < 0   (A|-B)
 244  *   No-op ?:    p = 0, d = 0   (null)          (used as policy rule placeholder)
 245  *
 246  *   resulting watches:
 247  *   ------------------
 248  *   Direct assertion (no watch needed)( if d <0 ) --> d = 0, w1 = p, w2 = 0
 249  *   Binary rule: p = first literal, d = 0, w2 = second literal, w1 = p
 250  *   every other : w1 = p, w2 = whatprovidesdata[d];
 251  *   Disabled rule: w1 = 0
 252  *
 253  *   always returns a rule for non-rpm rules
 254  */
 255
 256 Rule *
 257 solver_addrule(Solver *solv, Id p, Id d)
 258 {
 259   Pool *pool = solv->pool;
 260   Rule *r = 0;
 261   Id *dp = 0;
 262
 263   int n = 0;                           /* number of literals in rule - 1
 264                                           0 = direct assertion (single literal)
 265                                           1 = binary rule
 266                                           >1 =
 267                                         */
 268
 269   /* it often happenes that requires lead to adding the same rpm rule
 270    * multiple times, so we prune those duplicates right away to make
 271    * the work for unifyrules a bit easier */
 272
 273   if (solv->nrules                      /* we already have rules */
 274       && !solv->rpmrules_end)           /* but are not done with rpm rules */
 275     {
 276       r = solv->rules + solv->nrules - 1;   /* get the last added rule */
 277       if (r->p == p && r->d == d && d != 0)   /* identical and not user requested */
 278         return r;
 279     }
 280
 281     /*
 282      * compute number of literals (n) in rule
 283      */
 284
 285   if (d < 0)
 286     {
 287       /* always a binary rule */
 288       if (p == d)
 289         return 0;                      /* ignore self conflict */
 290       n = 1;
 291     }
 292   else if (d > 0)
 293     {
 294       for (dp = pool->whatprovidesdata + d; *dp; dp++, n++)
 295         if (*dp == -p)
 296           return 0;                     /* rule is self-fulfilling */
 297
 298       if (n == 1)   /* have single provider */
 299         d = dp[-1];                     /* take single literal */
 300     }
 301
 302   if (n == 1 && p > d && !solv->rpmrules_end)
 303     {
 304       /* smallest literal first so we can find dups */
 305       n = p; p = d; d = n;             /* p <-> d */
 306       n = 1;                           /* re-set n, was used as temp var */
 307     }
 308
 309   /*
 310    * check for duplicate
 311    */
 312
 313   /* check if the last added rule (r) is exactly the same as what we're looking for. */
 314   if (r && n == 1 && !r->d && r->p == p && r->w2 == d)
 315     return r;  /* binary rule */
 316
 317     /* have n-ary rule with same first literal, check other literals */
 318   if (r && n > 1 && r->d && r->p == p)
 319     {
 320       /* Rule where d is an offset in whatprovidesdata */
 321       Id *dp2;
 322       if (d == r->d)
 323         return r;
 324       dp2 = pool->whatprovidesdata + r->d;
 325       for (dp = pool->whatprovidesdata + d; *dp; dp++, dp2++)
 326         if (*dp != *dp2)
 327           break;
 328       if (*dp == *dp2)
 329         return r;
 330    }
 331
 332   /*
 333    * allocate new rule
 334    */
 335
 336   /* extend rule buffer */
 337   solv->rules = sat_extend(solv->rules, solv->nrules, 1, sizeof(Rule), RULES_BLOCK);
 338   r = solv->rules + solv->nrules++;    /* point to rule space */
 339
 340     /*
 341      * r = new rule
 342      */
 343
 344   r->p = p;
 345   if (n == 0)
 346     {
 347       /* direct assertion, no watch needed */
 348       r->d = 0;
 349       r->w1 = p;
 350       r->w2 = 0;
 351     }
 352   else if (n == 1)
 353     {
 354       /* binary rule */
 355       r->d = 0;
 356       r->w1 = p;
 357       r->w2 = d;
 358     }
 359   else
 360     {
 361       r->d = d;
 362       r->w1 = p;
 363       r->w2 = pool->whatprovidesdata[d];
 364     }
 365   r->n1 = 0;
 366   r->n2 = 0;
 367
 368   IF_POOLDEBUG (SAT_DEBUG_RULE_CREATION)
 369     {
 370       POOL_DEBUG(SAT_DEBUG_RULE_CREATION, "  Add rule: ");
 371       solver_printrule(solv, SAT_DEBUG_RULE_CREATION, r);
 372     }
 373
 374   return r;
 375 }
 376
 377
 378 /******************************************************************************
 379  ***
 380  *** rpm rule part: create rules representing the package dependencies
 381  ***
 382  ***/
 383
 384 /*
 385  *  special multiversion patch conflict handling:
 386  *  a patch conflict is also satisfied, if some other
 387  *  version with the same name/arch that doesn't conflict
 388  *  get's installed. The generated rule is thus:
 389  *  -patch|-cpack|opack1|opack2|...
 390  */
 391 static Id
 392 makemultiversionconflict(Solver *solv, Id n, Id con)
 393 {
 394   Pool *pool = solv->pool;
 395   Solvable *s, *sn;
 396   Queue q;
 397   Id p, pp, qbuf[64];
 398
 399   sn = pool->solvables + n;
 400   queue_init_buffer(&q, qbuf, sizeof(qbuf)/sizeof(*qbuf));
 401   queue_push(&q, -n);
 402   FOR_PROVIDES(p, pp, sn->name)
 403     {
 404       s = pool->solvables + p;
 405       if (s->name != sn->name || s->arch != sn->arch)
 406         continue;
 407       if (!MAPTST(&solv->noobsoletes, p))
 408         continue;
 409       if (pool_match_nevr(pool, pool->solvables + p, con))
 410         continue;
 411       /* here we have a multiversion solvable that doesn't conflict */
 412       /* thus we're not in conflict if it is installed */
 413       queue_push(&q, p);
 414     }
 415   if (q.count == 1)
 416     return -n;  /* no other package found, generate normal conflict */
 417   return pool_queuetowhatprovides(pool, &q);
 418 }
 419
 420 static inline void
 421 addrpmrule(Solver *solv, Id p, Id d, int type, Id dep)
 422 {
 423   if (!solv->ruleinfoq)
 424     solver_addrule(solv, p, d);
 425   else
 426     addrpmruleinfo(solv, p, d, type, dep);
 427 }
 428
 429 /*-------------------------------------------------------------------
 430  *
 431  * add (install) rules for solvable
 432  *
 433  * s: Solvable for which to add rules
 434  * m: m[s] = 1 for solvables which have rules, prevent rule duplication
 435  *
 436  * Algorithm: 'visit all nodes of a graph'. The graph nodes are
 437  *  solvables, the edges their dependencies.
 438  *  Starting from an installed solvable, this will create all rules
 439  *  representing the graph created by the solvables dependencies.
 440  *
 441  * for unfulfilled requirements, conflicts, obsoletes,....
 442  * add a negative assertion for solvables that are not installable
 443  *
 444  * It will also create rules for all solvables referenced by 's'
 445  *  i.e. descend to all providers of requirements of 's'
 446  *
 447  */
 448
 449 void
 450 solver_addrpmrulesforsolvable(Solver *solv, Solvable *s, Map *m)
 451 {
 452   Pool *pool = solv->pool;
 453   Repo *installed = solv->installed;
 454
 455   /* 'work' queue. keeps Ids of solvables we still have to work on.
 456      And buffer for it. */
 457   Queue workq;
 458   Id workqbuf[64];
 459
 460   int i;
 461     /* if to add rules for broken deps ('rpm -V' functionality)
 462      * 0 = yes, 1 = no
 463      */
 464   int dontfix;
 465     /* Id var and pointer for each dependency
 466      * (not used in parallel)
 467      */
 468   Id req, *reqp;
 469   Id con, *conp;
 470   Id obs, *obsp;
 471   Id rec, *recp;
 472   Id sug, *sugp;
 473   Id p, pp;             /* whatprovides loops */
 474   Id *dp;               /* ptr to 'whatprovides' */
 475   Id n;                 /* Id for current solvable 's' */
 476
 477   POOL_DEBUG(SAT_DEBUG_SCHUBI, "----- addrpmrulesforsolvable -----\n");
 478
 479   queue_init_buffer(&workq, workqbuf, sizeof(workqbuf)/sizeof(*workqbuf));
 480   queue_push(&workq, s - pool->solvables);      /* push solvable Id to work queue */
 481
 482   /* loop until there's no more work left */
 483   while (workq.count)
 484     {
 485       /*
 486        * n: Id of solvable
 487        * s: Pointer to solvable
 488        */
 489
 490       n = queue_shift(&workq);          /* 'pop' next solvable to work on from queue */
 491       if (m)
 492         {
 493           if (MAPTST(m, n))             /* continue if already visited */
 494             continue;
 495           MAPSET(m, n);                 /* mark as visited */
 496         }
 497
 498       s = pool->solvables + n;          /* s = Solvable in question */
 499
 500       dontfix = 0;
 501       if (installed                     /* Installed system available */
 502           && !solv->fixsystem           /* NOT repair errors in rpm dependency graph */
 503           && s->repo == installed       /* solvable is installed */
 504           && (!solv->fixmap.size || !MAPTST(&solv->fixmap, n - installed->start)))
 505         {
 506           dontfix = 1;                  /* dont care about broken rpm deps */
 507         }
 508
 509       if (!dontfix
 510           && s->arch != ARCH_SRC
 511           && s->arch != ARCH_NOSRC
 512           && !pool_installable(pool, s))
 513         {
 514           POOL_DEBUG(SAT_DEBUG_RULE_CREATION, "package %s [%d] is not installable\n", solvable2str(pool, s), (Id)(s - pool->solvables));
 515           addrpmrule(solv, -n, 0, SOLVER_RULE_RPM_NOT_INSTALLABLE, 0);
 516         }
 517
 518       /* yet another SUSE hack, sigh */
 519       if (pool->nscallback && !strncmp("product:", id2str(pool, s->name), 8))
 520         {
 521           Id buddy = pool->nscallback(pool, pool->nscallbackdata, NAMESPACE_PRODUCTBUDDY, n);
 522           if (buddy > 0 && buddy != SYSTEMSOLVABLE && buddy != n && buddy < pool->nsolvables)
 523             {
 524               addrpmrule(solv, n, -buddy, SOLVER_RULE_RPM_PACKAGE_REQUIRES, solvable_selfprovidedep(pool->solvables + n));
 525               addrpmrule(solv, buddy, -n, SOLVER_RULE_RPM_PACKAGE_REQUIRES, solvable_selfprovidedep(pool->solvables + buddy));
 526               if (m && !MAPTST(m, buddy))
 527                 queue_push(&workq, buddy);
 528             }
 529         }
 530
 531       /*-----------------------------------------
 532        * check requires of s
 533        */
 534
 535       if (s->requires)
 536         {
 537           reqp = s->repo->idarraydata + s->requires;
 538           while ((req = *reqp++) != 0)            /* go through all requires */
 539             {
 540               if (req == SOLVABLE_PREREQMARKER)   /* skip the marker */
 541                 continue;
 542
 543               /* find list of solvables providing 'req' */
 544               dp = pool_whatprovides_ptr(pool, req);
 545
 546               if (*dp == SYSTEMSOLVABLE)          /* always installed */
 547                 continue;
 548
 549               if (dontfix)
 550                 {
 551                   /* the strategy here is to not insist on dependencies
 552                    * that are already broken. so if we find one provider
 553                    * that was already installed, we know that the
 554                    * dependency was not broken before so we enforce it */
 555
 556                   /* check if any of the providers for 'req' is installed */
 557                   for (i = 0; (p = dp[i]) != 0; i++)
 558                     {
 559                       if (pool->solvables[p].repo == installed)
 560                         break;          /* provider was installed */
 561                     }
 562                   /* didn't find an installed provider: previously broken dependency */
 563                   if (!p)
 564                     {
 565                       POOL_DEBUG(SAT_DEBUG_RULE_CREATION, "ignoring broken requires %s of installed package %s\n", dep2str(pool, req), solvable2str(pool, s));
 566                       continue;
 567                     }
 568                 }
 569
 570               if (!*dp)
 571                 {
 572                   /* nothing provides req! */
 573                   POOL_DEBUG(SAT_DEBUG_RULE_CREATION, "package %s [%d] is not installable (%s)\n", solvable2str(pool, s), (Id)(s - pool->solvables), dep2str(pool, req));
 574                   addrpmrule(solv, -n, 0, SOLVER_RULE_RPM_NOTHING_PROVIDES_DEP, req);
 575                   continue;
 576                 }
 577
 578               IF_POOLDEBUG (SAT_DEBUG_RULE_CREATION)
 579                 {
 580                   POOL_DEBUG(SAT_DEBUG_RULE_CREATION,"  %s requires %s\n", solvable2str(pool, s), dep2str(pool, req));
 581                   for (i = 0; dp[i]; i++)
 582                     POOL_DEBUG(SAT_DEBUG_RULE_CREATION, "   provided by %s\n", solvid2str(pool, dp[i]));
 583                 }
 584
 585               /* add 'requires' dependency */
 586               /* rule: (-requestor|provider1|provider2|...|providerN) */
 587               addrpmrule(solv, -n, dp - pool->whatprovidesdata, SOLVER_RULE_RPM_PACKAGE_REQUIRES, req);
 588
 589               /* descend the dependency tree
 590                  push all non-visited providers on the work queue */
 591               if (m)
 592                 {
 593                   for (; *dp; dp++)
 594                     {
 595                       if (!MAPTST(m, *dp))
 596                         queue_push(&workq, *dp);
 597                     }
 598                 }
 599
 600             } /* while, requirements of n */
 601
 602         } /* if, requirements */
 603
 604       /* that's all we check for src packages */
 605       if (s->arch == ARCH_SRC || s->arch == ARCH_NOSRC)
 606         continue;
 607
 608       /*-----------------------------------------
 609        * check conflicts of s
 610        */
 611
 612       if (s->conflicts)
 613         {
 614           int ispatch = 0;
 615
 616           /* we treat conflicts in patches a bit differen:
 617            * - nevr matching
 618            * - multiversion handling
 619            * XXX: we should really handle this different, looking
 620            * at the name is a bad hack
 621            */
 622           if (!strncmp("patch:", id2str(pool, s->name), 6))
 623             ispatch = 1;
 624           conp = s->repo->idarraydata + s->conflicts;
 625           /* foreach conflicts of 's' */
 626           while ((con = *conp++) != 0)
 627             {
 628               /* foreach providers of a conflict of 's' */
 629               FOR_PROVIDES(p, pp, con)
 630                 {
 631                   if (ispatch && !pool_match_nevr(pool, pool->solvables + p, con))
 632                     continue;
 633                   /* dontfix: dont care about conflicts with already installed packs */
 634                   if (dontfix && pool->solvables[p].repo == installed)
 635                     continue;
 636                   /* p == n: self conflict */
 637                   if (p == n && !pool->allowselfconflicts)
 638                     {
 639                       if (ISRELDEP(con))
 640                         {
 641                           Reldep *rd = GETRELDEP(pool, con);
 642                           if (rd->flags == REL_NAMESPACE && rd->name == NAMESPACE_OTHERPROVIDERS)
 643                             continue;
 644                         }
 645                       p = 0;    /* make it a negative assertion, aka 'uninstallable' */
 646                     }
 647                   if (p && ispatch && solv->noobsoletes.size && MAPTST(&solv->noobsoletes, p) && ISRELDEP(con))
 648                     {
 649                       /* our patch conflicts with a noobsoletes (aka multiversion) package */
 650                       p = -makemultiversionconflict(solv, p, con);
 651                     }
 652                  /* rule: -n|-p: either solvable _or_ provider of conflict */
 653                   addrpmrule(solv, -n, -p, p ? SOLVER_RULE_RPM_PACKAGE_CONFLICT : SOLVER_RULE_RPM_SELF_CONFLICT, con);
 654                 }
 655             }
 656         }
 657
 658       /*-----------------------------------------
 659        * check obsoletes if not installed
 660        * (only installation will trigger the obsoletes in rpm)
 661        */
 662       if (!installed || pool->solvables[n].repo != installed)
 663         {                              /* not installed */
 664           int noobs = solv->noobsoletes.size && MAPTST(&solv->noobsoletes, n);
 665           if (s->obsoletes && !noobs)
 666             {
 667               obsp = s->repo->idarraydata + s->obsoletes;
 668               /* foreach obsoletes */
 669               while ((obs = *obsp++) != 0)
 670                 {
 671                   /* foreach provider of an obsoletes of 's' */
 672                   FOR_PROVIDES(p, pp, obs)
 673                     {
 674                       Solvable *ps = pool->solvables + p;
 675                       if (!pool->obsoleteusesprovides /* obsoletes are matched names, not provides */
 676                           && !pool_match_nevr(pool, ps, obs))
 677                         continue;
 678                       if (pool->obsoleteusescolors && !pool_colormatch(pool, s, ps))
 679                         continue;
 680                       addrpmrule(solv, -n, -p, SOLVER_RULE_RPM_PACKAGE_OBSOLETES, obs);
 681                     }
 682                 }
 683             }
 684           FOR_PROVIDES(p, pp, s->name)
 685             {
 686               Solvable *ps = pool->solvables + p;
 687               /* we still obsolete packages with same nevra, like rpm does */
 688               /* (actually, rpm mixes those packages. yuck...) */
 689               if (noobs && (s->name != ps->name || s->evr != ps->evr || s->arch != ps->arch))
 690                 continue;
 691               if (!pool->implicitobsoleteusesprovides && s->name != ps->name)
 692                 continue;
 693               if (pool->obsoleteusescolors && !pool_colormatch(pool, s, ps))
 694                 continue;
 695               if (s->name == ps->name)
 696                 addrpmrule(solv, -n, -p, SOLVER_RULE_RPM_SAME_NAME, 0);
 697               else
 698                 addrpmrule(solv, -n, -p, SOLVER_RULE_RPM_IMPLICIT_OBSOLETES, s->name);
 699             }
 700         }
 701
 702       /*-----------------------------------------
 703        * add recommends to the work queue
 704        */
 705       if (s->recommends && m)
 706         {
 707           recp = s->repo->idarraydata + s->recommends;
 708           while ((rec = *recp++) != 0)
 709             {
 710               FOR_PROVIDES(p, pp, rec)
 711                 if (!MAPTST(m, p))
 712                   queue_push(&workq, p);
 713             }
 714         }
 715       if (s->suggests && m)
 716         {
 717           sugp = s->repo->idarraydata + s->suggests;
 718           while ((sug = *sugp++) != 0)
 719             {
 720               FOR_PROVIDES(p, pp, sug)
 721                 if (!MAPTST(m, p))
 722                   queue_push(&workq, p);
 723             }
 724         }
 725     }
 726   queue_free(&workq);
 727   POOL_DEBUG(SAT_DEBUG_SCHUBI, "----- addrpmrulesforsolvable end -----\n");
 728 }
 729
 730
 731 /*-------------------------------------------------------------------
 732  *
 733  * Add package rules for weak rules
 734  *
 735  * m: visited solvables
 736  */
 737
 738 void
 739 solver_addrpmrulesforweak(Solver *solv, Map *m)
 740 {
 741   Pool *pool = solv->pool;
 742   Solvable *s;
 743   Id sup, *supp;
 744   int i, n;
 745
 746   POOL_DEBUG(SAT_DEBUG_SCHUBI, "----- addrpmrulesforweak -----\n");
 747     /* foreach solvable in pool */
 748   for (i = n = 1; n < pool->nsolvables; i++, n++)
 749     {
 750       if (i == pool->nsolvables)                /* wrap i */
 751         i = 1;
 752       if (MAPTST(m, i))                         /* been there */
 753         continue;
 754
 755       s = pool->solvables + i;
 756       if (!pool_installable(pool, s))           /* only look at installable ones */
 757         continue;
 758
 759       sup = 0;
 760       if (s->supplements)
 761         {
 762           /* find possible supplements */
 763           supp = s->repo->idarraydata + s->supplements;
 764           while ((sup = *supp++) != ID_NULL)
 765             if (dep_possible(solv, sup, m))
 766               break;
 767         }
 768
 769       /* if nothing found, check for enhances */
 770       if (!sup && s->enhances)
 771         {
 772           supp = s->repo->idarraydata + s->enhances;
 773           while ((sup = *supp++) != ID_NULL)
 774             if (dep_possible(solv, sup, m))
 775               break;
 776         }
 777       /* if nothing found, goto next solvables */
 778       if (!sup)
 779         continue;
 780       solver_addrpmrulesforsolvable(solv, s, m);
 781       n = 0;                    /* check all solvables again */
 782     }
 783   POOL_DEBUG(SAT_DEBUG_SCHUBI, "----- addrpmrulesforweak end -----\n");
 784 }
 785
 786
 787 /*-------------------------------------------------------------------
 788  *
 789  * add package rules for possible updates
 790  *
 791  * s: solvable
 792  * m: map of already visited solvables
 793  * allow_all: 0 = dont allow downgrades, 1 = allow all candidates
 794  */
 795
 796 void
 797 solver_addrpmrulesforupdaters(Solver *solv, Solvable *s, Map *m, int allow_all)
 798 {
 799   Pool *pool = solv->pool;
 800   int i;
 801     /* queue and buffer for it */
 802   Queue qs;
 803   Id qsbuf[64];
 804
 805   POOL_DEBUG(SAT_DEBUG_SCHUBI, "----- addrpmrulesforupdaters -----\n");
 806
 807   queue_init_buffer(&qs, qsbuf, sizeof(qsbuf)/sizeof(*qsbuf));
 808     /* find update candidates for 's' */
 809   policy_findupdatepackages(solv, s, &qs, allow_all);
 810     /* add rule for 's' if not already done */
 811   if (!MAPTST(m, s - pool->solvables))
 812     solver_addrpmrulesforsolvable(solv, s, m);
 813     /* foreach update candidate, add rule if not already done */
 814   for (i = 0; i < qs.count; i++)
 815     if (!MAPTST(m, qs.elements[i]))
 816       solver_addrpmrulesforsolvable(solv, pool->solvables + qs.elements[i], m);
 817   queue_free(&qs);
 818
 819   POOL_DEBUG(SAT_DEBUG_SCHUBI, "----- addrpmrulesforupdaters -----\n");
 820 }
 821
 822
 823 /***********************************************************************
 824  ***
 825  ***  Update/Feature rule part
 826  ***
 827  ***  Those rules make sure an installed package isn't silently deleted
 828  ***
 829  ***/
 830
 831 static Id
 832 finddistupgradepackages(Solver *solv, Solvable *s, Queue *qs, int allow_all)
 833 {
 834   Pool *pool = solv->pool;
 835   int i;
 836
 837   policy_findupdatepackages(solv, s, qs, allow_all);
 838   if (!qs->count)
 839     {
 840       if (allow_all)
 841         return 0;       /* orphaned, don't create feature rule */
 842       /* check if this is an orphaned package */
 843       policy_findupdatepackages(solv, s, qs, 1);
 844       if (!qs->count)
 845         return 0;       /* orphaned, don't create update rule */
 846       qs->count = 0;
 847       return -SYSTEMSOLVABLE;   /* supported but not installable */
 848     }
 849   if (allow_all)
 850     return s - pool->solvables;
 851   /* check if it is ok to keep the installed package */
 852   for (i = 0; i < qs->count; i++)
 853     {
 854       Solvable *ns = pool->solvables + qs->elements[i];
 855       if (s->evr == ns->evr && solvable_identical(s, ns))
 856         return s - pool->solvables;
 857     }
 858   /* nope, it must be some other package */
 859   return -SYSTEMSOLVABLE;
 860 }
 861
 862 /* add packages from the dup repositories to the update candidates
 863  * this isn't needed for the global dup mode as all packages are
 864  * from dup repos in that case */
 865 static void
 866 addduppackages(Solver *solv, Solvable *s, Queue *qs)
 867 {
 868   Queue dupqs;
 869   Id p, dupqsbuf[64];
 870   int i;
 871   int oldnoupdateprovide = solv->noupdateprovide;
 872
 873   queue_init_buffer(&dupqs, dupqsbuf, sizeof(dupqsbuf)/sizeof(*dupqsbuf));
 874   solv->noupdateprovide = 1;
 875   policy_findupdatepackages(solv, s, &dupqs, 2);
 876   solv->noupdateprovide = oldnoupdateprovide;
 877   for (i = 0; i < dupqs.count; i++)
 878     {
 879       p = dupqs.elements[i];
 880       if (MAPTST(&solv->dupmap, p))
 881         queue_pushunique(qs, p);
 882     }
 883   queue_free(&dupqs);
 884 }
 885
 886 /*-------------------------------------------------------------------
 887  *
 888  * add rule for update
 889  *   (A|A1|A2|A3...)  An = update candidates for A
 890  *
 891  * s = (installed) solvable
 892  */
 893
 894 void
 895 solver_addupdaterule(Solver *solv, Solvable *s, int allow_all)
 896 {
 897   /* installed packages get a special upgrade allowed rule */
 898   Pool *pool = solv->pool;
 899   Id p, d;
 900   Queue qs;
 901   Id qsbuf[64];
 902
 903   POOL_DEBUG(SAT_DEBUG_SCHUBI, "-----  addupdaterule -----\n");
 904   queue_init_buffer(&qs, qsbuf, sizeof(qsbuf)/sizeof(*qsbuf));
 905   p = s - pool->solvables;
 906   /* find update candidates for 's' */
 907   if (solv->distupgrade)
 908     p = finddistupgradepackages(solv, s, &qs, allow_all);
 909   else
 910     policy_findupdatepackages(solv, s, &qs, allow_all);
 911   if (!allow_all && !solv->distupgrade && solv->dupinvolvedmap.size && MAPTST(&solv->dupinvolvedmap, p))
 912     addduppackages(solv, s, &qs);
 913
 914   if (!allow_all && qs.count && solv->noobsoletes.size)
 915     {
 916       int i, j;
 917
 918       d = pool_queuetowhatprovides(pool, &qs);
 919       /* filter out all noobsoletes packages as they don't update */
 920       for (i = j = 0; i < qs.count; i++)
 921         {
 922           if (MAPTST(&solv->noobsoletes, qs.elements[i]))
 923             {
 924               /* it's ok if they have same nevra */
 925               Solvable *ps = pool->solvables + qs.elements[i];
 926               if (ps->name != s->name || ps->evr != s->evr || ps->arch != s->arch)
 927                 continue;
 928             }
 929           qs.elements[j++] = qs.elements[i];
 930         }
 931       if (j == 0 && p == -SYSTEMSOLVABLE && solv->distupgrade)
 932         {
 933           queue_push(&solv->orphaned, s - pool->solvables);     /* treat as orphaned */
 934           j = qs.count;
 935         }
 936       if (j < qs.count)
 937         {
 938           if (d && solv->updatesystem && solv->installed && s->repo == solv->installed)
 939             {
 940               if (!solv->multiversionupdaters)
 941                 solv->multiversionupdaters = sat_calloc(solv->installed->end - solv->installed->start, sizeof(Id));
 942               solv->multiversionupdaters[s - pool->solvables - solv->installed->start] = d;
 943             }
 944           qs.count = j;
 945         }
 946     }
 947   if (qs.count && p == -SYSTEMSOLVABLE)
 948     p = queue_shift(&qs);
 949   d = qs.count ? pool_queuetowhatprovides(pool, &qs) : 0;
 950   queue_free(&qs);
 951   solver_addrule(solv, p, d);   /* allow update of s */
 952   POOL_DEBUG(SAT_DEBUG_SCHUBI, "-----  addupdaterule end -----\n");
 953 }
 954
 955 static inline void
 956 disableupdaterule(Solver *solv, Id p)
 957 {
 958   Rule *r;
 959
 960   MAPSET(&solv->noupdate, p - solv->installed->start);
 961   r = solv->rules + solv->updaterules + (p - solv->installed->start);
 962   if (r->p && r->d >= 0)
 963     solver_disablerule(solv, r);
 964   r = solv->rules + solv->featurerules + (p - solv->installed->start);
 965   if (r->p && r->d >= 0)
 966     solver_disablerule(solv, r);
 967 }
 968
 969 static inline void
 970 reenableupdaterule(Solver *solv, Id p)
 971 {
 972   Pool *pool = solv->pool;
 973   Rule *r;
 974
 975   MAPCLR(&solv->noupdate, p - solv->installed->start);
 976   r = solv->rules + solv->updaterules + (p - solv->installed->start);
 977   if (r->p)
 978     {
 979       if (r->d >= 0)
 980         return;
 981       solver_enablerule(solv, r);
 982       IF_POOLDEBUG (SAT_DEBUG_SOLUTIONS)
 983         {
 984           POOL_DEBUG(SAT_DEBUG_SOLUTIONS, "@@@ re-enabling ");
 985           solver_printruleclass(solv, SAT_DEBUG_SOLUTIONS, r);
 986         }
 987       return;
 988     }
 989   r = solv->rules + solv->featurerules + (p - solv->installed->start);
 990   if (r->p && r->d < 0)
 991     {
 992       solver_enablerule(solv, r);
 993       IF_POOLDEBUG (SAT_DEBUG_SOLUTIONS)
 994         {
 995           POOL_DEBUG(SAT_DEBUG_SOLUTIONS, "@@@ re-enabling ");
 996           solver_printruleclass(solv, SAT_DEBUG_SOLUTIONS, r);
 997         }
 998     }
 999 }
1000
1001
1002 /***********************************************************************
1003  ***
1004  ***  Infarch rule part
1005  ***
1006  ***  Infarch rules make sure the solver uses the best architecture of
1007  ***  a package if multiple archetectures are available
1008  ***
1009  ***/
1010
1011 void
1012 solver_addinfarchrules(Solver *solv, Map *addedmap)
1013 {
1014   Pool *pool = solv->pool;
1015   int first, i, j;
1016   Id p, pp, a, aa, bestarch;
1017   Solvable *s, *ps, *bests;
1018   Queue badq, allowedarchs;
1019
1020   queue_init(&badq);
1021   queue_init(&allowedarchs);
1022   solv->infarchrules = solv->nrules;
1023   for (i = 1; i < pool->nsolvables; i++)
1024     {
1025       if (i == SYSTEMSOLVABLE || !MAPTST(addedmap, i))
1026         continue;
1027       s = pool->solvables + i;
1028       first = i;
1029       bestarch = 0;
1030       bests = 0;
1031       queue_empty(&allowedarchs);
1032       FOR_PROVIDES(p, pp, s->name)
1033         {
1034           ps = pool->solvables + p;
1035           if (ps->name != s->name || !MAPTST(addedmap, p))
1036             continue;
1037           if (p == i)
1038             first = 0;
1039           if (first)
1040             break;
1041           a = ps->arch;
1042           a = (a <= pool->lastarch) ? pool->id2arch[a] : 0;
1043           if (a != 1 && pool->installed && ps->repo == pool->installed)
1044             {
1045               if (!solv->distupgrade)
1046                 queue_pushunique(&allowedarchs, ps->arch);      /* also ok to keep this architecture */
1047               continue;         /* ignore installed solvables when calculating the best arch */
1048             }
1049           if (a && a != 1 && (!bestarch || a < bestarch))
1050             {
1051               bestarch = a;
1052               bests = ps;
1053             }
1054         }
1055       if (first)
1056         continue;
1057       /* speed up common case where installed package already has best arch */
1058       if (allowedarchs.count == 1 && bests && allowedarchs.elements[0] == bests->arch)
1059         allowedarchs.count--;   /* installed arch is best */
1060       queue_empty(&badq);
1061       FOR_PROVIDES(p, pp, s->name)
1062         {
1063           ps = pool->solvables + p;
1064           if (ps->name != s->name || !MAPTST(addedmap, p))
1065             continue;
1066           a = ps->arch;
1067           a = (a <= pool->lastarch) ? pool->id2arch[a] : 0;
1068           if (a != 1 && bestarch && ((a ^ bestarch) & 0xffff0000) != 0)
1069             {
1070               for (j = 0; j < allowedarchs.count; j++)
1071                 {
1072                   aa = allowedarchs.elements[j];
1073                   if (ps->arch == aa)
1074                     break;
1075                   aa = (aa <= pool->lastarch) ? pool->id2arch[aa] : 0;
1076                   if (aa && ((a ^ aa) & 0xffff0000) == 0)
1077                     break;      /* compatible */
1078                 }
1079               if (j == allowedarchs.count)
1080                 queue_push(&badq, p);
1081             }
1082         }
1083       if (!badq.count)
1084         continue;
1085       /* block all solvables in the badq! */
1086       for (j = 0; j < badq.count; j++)
1087         {
1088           p = badq.elements[j];
1089           solver_addrule(solv, -p, 0);
1090         }
1091     }
1092   queue_free(&badq);
1093   queue_free(&allowedarchs);
1094   solv->infarchrules_end = solv->nrules;
1095 }
1096
1097 static inline void
1098 disableinfarchrule(Solver *solv, Id name)
1099 {
1100   Pool *pool = solv->pool;
1101   Rule *r;
1102   int i;
1103   for (i = solv->infarchrules, r = solv->rules + i; i < solv->infarchrules_end; i++, r++)
1104     {
1105       if (r->p < 0 && r->d >= 0 && pool->solvables[-r->p].name == name)
1106         solver_disablerule(solv, r);
1107     }
1108 }
1109
1110 static inline void
1111 reenableinfarchrule(Solver *solv, Id name)
1112 {
1113   Pool *pool = solv->pool;
1114   Rule *r;
1115   int i;
1116   for (i = solv->infarchrules, r = solv->rules + i; i < solv->infarchrules_end; i++, r++)
1117     {
1118       if (r->p < 0 && r->d < 0 && pool->solvables[-r->p].name == name)
1119         {
1120           solver_enablerule(solv, r);
1121           IF_POOLDEBUG (SAT_DEBUG_SOLUTIONS)
1122             {
1123               POOL_DEBUG(SAT_DEBUG_SOLUTIONS, "@@@ re-enabling ");
1124               solver_printruleclass(solv, SAT_DEBUG_SOLUTIONS, r);
1125             }
1126         }
1127     }
1128 }
1129
1130
1131 /***********************************************************************
1132  ***
1133  ***  Dup rule part
1134  ***
1135  ***  Dup rules make sure a package is selected from the specified dup
1136  ***  repositories if an update candidate is included in one of them.
1137  ***
1138  ***/
1139
1140 void
1141 solver_createdupmaps(Solver *solv)
1142 {
1143   Queue *job = &solv->job;
1144   Pool *pool = solv->pool;
1145   Repo *repo;
1146   Id how, what, p, pi, pp, obs, *obsp;
1147   Solvable *s, *ps;
1148   int i;
1149
1150   map_init(&solv->dupmap, pool->nsolvables);
1151   map_init(&solv->dupinvolvedmap, pool->nsolvables);
1152   for (i = 0; i < job->count; i += 2)
1153     {
1154       how = job->elements[i];
1155       what = job->elements[i + 1];
1156       switch (how & SOLVER_JOBMASK)
1157         {
1158         case SOLVER_DISTUPGRADE:
1159           if ((how & SOLVER_SELECTMASK) != SOLVER_SOLVABLE_REPO)
1160             break;
1161           if (what <= 0 || what > pool->nrepos)
1162             break;
1163           repo = pool_id2repo(pool, what);
1164           FOR_REPO_SOLVABLES(repo, p, s)
1165             {
1166               MAPSET(&solv->dupmap, p);
1167               FOR_PROVIDES(pi, pp, s->name)
1168                 {
1169                   ps = pool->solvables + pi;
1170                   if (ps->name != s->name)
1171                     continue;
1172                   MAPSET(&solv->dupinvolvedmap, pi);
1173                 }
1174               if (s->obsoletes)
1175                 {
1176                   /* FIXME: check obsoletes/provides combination */
1177                   obsp = s->repo->idarraydata + s->obsoletes;
1178                   while ((obs = *obsp++) != 0)
1179                     {
1180                       FOR_PROVIDES(pi, pp, obs)
1181                         {
1182                           Solvable *pis = pool->solvables + pi;
1183                           if (!pool->obsoleteusesprovides && !pool_match_nevr(pool, pis, obs))
1184                             continue;
1185                           if (pool->obsoleteusescolors && !pool_colormatch(pool, s, pis))
1186                             continue;
1187                           MAPSET(&solv->dupinvolvedmap, pi);
1188                         }
1189                     }
1190                 }
1191             }
1192           break;
1193         default:
1194           break;
1195         }
1196     }
1197   MAPCLR(&solv->dupinvolvedmap, SYSTEMSOLVABLE);
1198 }
1199
1200 void
1201 solver_freedupmaps(Solver *solv)
1202 {
1203   map_free(&solv->dupmap);
1204   map_free(&solv->dupinvolvedmap);
1205 }
1206
1207 void
1208 solver_addduprules(Solver *solv, Map *addedmap)
1209 {
1210   Pool *pool = solv->pool;
1211   Id p, pp;
1212   Solvable *s, *ps;
1213   int first, i;
1214
1215   solv->duprules = solv->nrules;
1216   for (i = 1; i < pool->nsolvables; i++)
1217     {
1218       if (i == SYSTEMSOLVABLE || !MAPTST(addedmap, i))
1219         continue;
1220       s = pool->solvables + i;
1221       first = i;
1222       FOR_PROVIDES(p, pp, s->name)
1223         {
1224           ps = pool->solvables + p;
1225           if (ps->name != s->name || !MAPTST(addedmap, p))
1226             continue;
1227           if (p == i)
1228             first = 0;
1229           if (first)
1230             break;
1231           if (!MAPTST(&solv->dupinvolvedmap, p))
1232             continue;
1233           if (solv->installed && ps->repo == solv->installed)
1234             {
1235               if (!solv->updatemap.size)
1236                 map_grow(&solv->updatemap, solv->installed->end - solv->installed->start);
1237               MAPSET(&solv->updatemap, p - solv->installed->start);
1238               if (!MAPTST(&solv->dupmap, p))
1239                 {
1240                   Id ip, ipp;
1241                   /* is installed identical to a good one? */
1242                   FOR_PROVIDES(ip, ipp, s->name)
1243                     {
1244                       Solvable *is = pool->solvables + ip;
1245                       if (!MAPTST(&solv->dupmap, ip))
1246                         continue;
1247                       if (is->evr == s->evr && solvable_identical(s, is))
1248                         break;
1249                     }
1250                   if (!ip)
1251                     solver_addrule(solv, -p, 0);        /* no match, sorry */
1252                 }
1253             }
1254           else if (!MAPTST(&solv->dupmap, p))
1255             solver_addrule(solv, -p, 0);
1256         }
1257     }
1258   solv->duprules_end = solv->nrules;
1259 }
1260
1261
1262 static inline void
1263 disableduprule(Solver *solv, Id name)
1264 {
1265   Pool *pool = solv->pool;
1266   Rule *r;
1267   int i;
1268   for (i = solv->duprules, r = solv->rules + i; i < solv->duprules_end; i++, r++)
1269     {
1270       if (r->p < 0 && r->d >= 0 && pool->solvables[-r->p].name == name)
1271         solver_disablerule(solv, r);
1272     }
1273 }
1274
1275 static inline void
1276 reenableduprule(Solver *solv, Id name)
1277 {
1278   Pool *pool = solv->pool;
1279   Rule *r;
1280   int i;
1281   for (i = solv->duprules, r = solv->rules + i; i < solv->duprules_end; i++, r++)
1282     {
1283       if (r->p < 0 && r->d < 0 && pool->solvables[-r->p].name == name)
1284         {
1285           solver_enablerule(solv, r);
1286           IF_POOLDEBUG (SAT_DEBUG_SOLUTIONS)
1287             {
1288               POOL_DEBUG(SAT_DEBUG_SOLUTIONS, "@@@ re-enabling ");
1289               solver_printruleclass(solv, SAT_DEBUG_SOLUTIONS, r);
1290             }
1291         }
1292     }
1293 }
1294
1295
1296 /***********************************************************************
1297  ***
1298  ***  Policy rule disabling/reenabling
1299  ***
1300  ***  Disable all policy rules that conflict with our jobs. If a job
1301  ***  gets disabled later on, reenable the involved policy rules again.
1302  ***
1303  ***/
1304
1305 #define DISABLE_UPDATE  1
1306 #define DISABLE_INFARCH 2
1307 #define DISABLE_DUP     3
1308
1309 static void
1310 jobtodisablelist(Solver *solv, Id how, Id what, Queue *q)
1311 {
1312   Pool *pool = solv->pool;
1313   Id select, p, pp;
1314   Repo *installed;
1315   Solvable *s;
1316   int i;
1317
1318   installed = solv->installed;
1319   select = how & SOLVER_SELECTMASK;
1320   switch (how & SOLVER_JOBMASK)
1321     {
1322     case SOLVER_INSTALL:
1323       if ((select == SOLVER_SOLVABLE_NAME || select == SOLVER_SOLVABLE_PROVIDES) && solv->infarchrules != solv->infarchrules_end && ISRELDEP(what))
1324         {
1325           Reldep *rd = GETRELDEP(pool, what);
1326           if (rd->flags == REL_ARCH)
1327             {
1328               int qcnt = q->count;
1329               FOR_JOB_SELECT(p, pp, select, what)
1330                 {
1331                   s = pool->solvables + p;
1332                   /* unify names */
1333                   for (i = qcnt; i < q->count; i += 2)
1334                     if (q->elements[i + 1] == s->name)
1335                       break;
1336                   if (i < q->count)
1337                     continue;
1338                   queue_push(q, DISABLE_INFARCH);
1339                   queue_push(q, s->name);
1340                 }
1341             }
1342         }
1343       if (select != SOLVER_SOLVABLE)
1344         break;
1345       s = pool->solvables + what;
1346       if (solv->infarchrules != solv->infarchrules_end)
1347         {
1348           queue_push(q, DISABLE_INFARCH);
1349           queue_push(q, s->name);
1350         }
1351       if (solv->duprules != solv->duprules_end)
1352         {
1353           queue_push(q, DISABLE_DUP);
1354           queue_push(q, s->name);
1355         }
1356       if (!installed)
1357         return;
1358       if (solv->noobsoletes.size && MAPTST(&solv->noobsoletes, what))
1359         return;
1360       if (s->repo == installed)
1361         {
1362           queue_push(q, DISABLE_UPDATE);
1363           queue_push(q, what);
1364           return;
1365         }
1366       if (s->obsoletes)
1367         {
1368           Id obs, *obsp;
1369           obsp = s->repo->idarraydata + s->obsoletes;
1370           while ((obs = *obsp++) != 0)
1371             FOR_PROVIDES(p, pp, obs)
1372               {
1373                 Solvable *ps = pool->solvables + p;
1374                 if (ps->repo != installed)
1375                   continue;
1376                 if (!pool->obsoleteusesprovides && !pool_match_nevr(pool, ps, obs))
1377                   continue;
1378                 if (pool->obsoleteusescolors && !pool_colormatch(pool, s, ps))
1379                   continue;
1380                 queue_push(q, DISABLE_UPDATE);
1381                 queue_push(q, p);
1382               }
1383         }
1384       FOR_PROVIDES(p, pp, s->name)
1385         {
1386           Solvable *ps = pool->solvables + p;
1387           if (ps->repo != installed)
1388             continue;
1389           if (!pool->implicitobsoleteusesprovides && ps->name != s->name)
1390             continue;
1391           if (pool->obsoleteusescolors && !pool_colormatch(pool, s, ps))
1392             continue;
1393           queue_push(q, DISABLE_UPDATE);
1394           queue_push(q, p);
1395         }
1396       return;
1397     case SOLVER_ERASE:
1398       if (!installed)
1399         break;
1400       FOR_JOB_SELECT(p, pp, select, what)
1401         if (pool->solvables[p].repo == installed)
1402           {
1403             queue_push(q, DISABLE_UPDATE);
1404             queue_push(q, p);
1405           }
1406       return;
1407     default:
1408       return;
1409     }
1410 }
1411
1412 /* disable all policy rules that are in conflict with our job list */
1413 void
1414 solver_disablepolicyrules(Solver *solv)
1415 {
1416   Queue *job = &solv->job;
1417   int i, j;
1418   Queue allq;
1419   Rule *r;
1420   Id lastjob = -1;
1421   Id allqbuf[128];
1422
1423   queue_init_buffer(&allq, allqbuf, sizeof(allqbuf)/sizeof(*allqbuf));
1424
1425   for (i = solv->jobrules; i < solv->jobrules_end; i++)
1426     {
1427       r = solv->rules + i;
1428       if (r->d < 0)     /* disabled? */
1429         continue;
1430       j = solv->ruletojob.elements[i - solv->jobrules];
1431       if (j == lastjob)
1432         continue;
1433       lastjob = j;
1434       jobtodisablelist(solv, job->elements[j], job->elements[j + 1], &allq);
1435     }
1436   MAPZERO(&solv->noupdate);
1437   for (i = 0; i < allq.count; i += 2)
1438     {
1439       Id type = allq.elements[i], arg = allq.elements[i + 1];
1440       switch(type)
1441         {
1442         case DISABLE_UPDATE:
1443           disableupdaterule(solv, arg);
1444           break;
1445         case DISABLE_INFARCH:
1446           disableinfarchrule(solv, arg);
1447           break;
1448         case DISABLE_DUP:
1449           disableduprule(solv, arg);
1450           break;
1451         default:
1452           break;
1453         }
1454     }
1455   queue_free(&allq);
1456 }
1457
1458 /* we just disabled job #jobidx, now reenable all policy rules that were
1459  * disabled because of this job */
1460 void
1461 solver_reenablepolicyrules(Solver *solv, int jobidx)
1462 {
1463   Queue *job = &solv->job;
1464   int i, j;
1465   Queue q, allq;
1466   Rule *r;
1467   Id lastjob = -1;
1468   Id qbuf[32], allqbuf[128];
1469
1470   queue_init_buffer(&q, qbuf, sizeof(qbuf)/sizeof(*qbuf));
1471   queue_init_buffer(&allq, allqbuf, sizeof(allqbuf)/sizeof(*allqbuf));
1472   jobtodisablelist(solv, job->elements[jobidx], job->elements[jobidx + 1], &q);
1473   if (!q.count)
1474     return;
1475   for (i = solv->jobrules; i < solv->jobrules_end; i++)
1476     {
1477       r = solv->rules + i;
1478       if (r->d < 0)     /* disabled? */
1479         continue;
1480       j = solv->ruletojob.elements[i - solv->jobrules];
1481       if (j == lastjob)
1482         continue;
1483       lastjob = j;
1484       jobtodisablelist(solv, job->elements[j], job->elements[j + 1], &allq);
1485     }
1486   for (j = 0; j < q.count; j += 2)
1487     {
1488       Id type = q.elements[j], arg = q.elements[j + 1];
1489       for (i = 0; i < allq.count; i += 2)
1490         if (allq.elements[i] == type && allq.elements[i + 1] == arg)
1491           break;
1492       if (i < allq.count)
1493         continue;       /* still disabled */
1494       switch(type)
1495         {
1496         case DISABLE_UPDATE:
1497           reenableupdaterule(solv, arg);
1498           break;
1499         case DISABLE_INFARCH:
1500           reenableinfarchrule(solv, arg);
1501           break;
1502         case DISABLE_DUP:
1503           reenableduprule(solv, arg);
1504           break;
1505         }
1506     }
1507   queue_free(&allq);
1508   queue_free(&q);
1509 }
1510
1511
1512 /***********************************************************************
1513  ***
1514  ***  Rule info part, tell the user what the rule is about.
1515  ***
1516  ***/
1517
1518 static void
1519 addrpmruleinfo(Solver *solv, Id p, Id d, int type, Id dep)
1520 {
1521   Pool *pool = solv->pool;
1522   Rule *r;
1523   Id w2, op, od, ow2;
1524
1525   /* check if this creates the rule we're searching for */
1526   r = solv->rules + solv->ruleinfoq->elements[0];
1527   op = r->p;
1528   od = r->d < 0 ? -r->d - 1 : r->d;
1529   ow2 = 0;
1530
1531   /* normalize */
1532   w2 = d > 0 ? 0 : d;
1533   if (p < 0 && d > 0 && (!pool->whatprovidesdata[d] || !pool->whatprovidesdata[d + 1]))
1534     {
1535       w2 = pool->whatprovidesdata[d];
1536       d = 0;
1537
1538     }
1539   if (p > 0 && d < 0)           /* this hack is used for buddy deps */
1540     {
1541       w2 = p;
1542       p = d;
1543     }
1544
1545   if (d > 0)
1546     {
1547       if (p != op && !od)
1548         return;
1549       if (d != od)
1550         {
1551           Id *dp = pool->whatprovidesdata + d;
1552           Id *odp = pool->whatprovidesdata + od;
1553           while (*dp)
1554             if (*dp++ != *odp++)
1555               return;
1556           if (*odp)
1557             return;
1558         }
1559       w2 = 0;
1560       /* handle multiversion conflict rules */
1561       if (p < 0 && pool->whatprovidesdata[d] < 0)
1562         {
1563           w2 = pool->whatprovidesdata[d];
1564           /* XXX: free memory */
1565         }
1566     }
1567   else
1568     {
1569       if (od)
1570         return;
1571       ow2 = r->w2;
1572       if (p > w2)
1573         {
1574           if (w2 != op || p != ow2)
1575             return;
1576         }
1577       else
1578         {
1579           if (p != op || w2 != ow2)
1580             return;
1581         }
1582     }
1583   /* yep, rule matches. record info */
1584   queue_push(solv->ruleinfoq, type);
1585   if (type == SOLVER_RULE_RPM_SAME_NAME)
1586     {
1587       /* we normalize same name order */
1588       queue_push(solv->ruleinfoq, op < 0 ? -op : 0);
1589       queue_push(solv->ruleinfoq, ow2 < 0 ? -ow2 : 0);
1590     }
1591   else
1592     {
1593       queue_push(solv->ruleinfoq, p < 0 ? -p : 0);
1594       queue_push(solv->ruleinfoq, w2 < 0 ? -w2 : 0);
1595     }
1596   queue_push(solv->ruleinfoq, dep);
1597 }
1598
1599 static int
1600 solver_allruleinfos_cmp(const void *ap, const void *bp, void *dp)
1601 {
1602   const Id *a = ap, *b = bp;
1603   int r;
1604
1605   r = a[0] - b[0];
1606   if (r)
1607     return r;
1608   r = a[1] - b[1];
1609   if (r)
1610     return r;
1611   r = a[2] - b[2];
1612   if (r)
1613     return r;
1614   r = a[3] - b[3];
1615   if (r)
1616     return r;
1617   return 0;
1618 }
1619
1620 int
1621 solver_allruleinfos(Solver *solv, Id rid, Queue *rq)
1622 {
1623   Pool *pool = solv->pool;
1624   Rule *r = solv->rules + rid;
1625   int i, j;
1626
1627   queue_empty(rq);
1628   if (rid <= 0 || rid >= solv->rpmrules_end)
1629     {
1630       Id type, from, to, dep;
1631       type = solver_ruleinfo(solv, rid, &from, &to, &dep);
1632       queue_push(rq, type);
1633       queue_push(rq, from);
1634       queue_push(rq, to);
1635       queue_push(rq, dep);
1636       return 1;
1637     }
1638   if (r->p >= 0)
1639     return 0;
1640   queue_push(rq, rid);
1641   solv->ruleinfoq = rq;
1642   solver_addrpmrulesforsolvable(solv, pool->solvables - r->p, 0);
1643   /* also try reverse direction for conflicts */
1644   if ((r->d == 0 || r->d == -1) && r->w2 < 0)
1645     solver_addrpmrulesforsolvable(solv, pool->solvables - r->w2, 0);
1646   solv->ruleinfoq = 0;
1647   queue_shift(rq);
1648   /* now sort & unify em */
1649   if (!rq->count)
1650     return 0;
1651   sat_sort(rq->elements, rq->count / 4, 4 * sizeof(Id), solver_allruleinfos_cmp, 0);
1652   /* throw out identical entries */
1653   for (i = j = 0; i < rq->count; i += 4)
1654     {
1655       if (j)
1656         {
1657           if (rq->elements[i] == rq->elements[j - 4] &&
1658               rq->elements[i + 1] == rq->elements[j - 3] &&
1659               rq->elements[i + 2] == rq->elements[j - 2] &&
1660               rq->elements[i + 3] == rq->elements[j - 1])
1661             continue;
1662         }
1663       rq->elements[j++] = rq->elements[i];
1664       rq->elements[j++] = rq->elements[i + 1];
1665       rq->elements[j++] = rq->elements[i + 2];
1666       rq->elements[j++] = rq->elements[i + 3];
1667     }
1668   rq->count = j;
1669   return j / 4;
1670 }
1671
1672 SolverRuleinfo
1673 solver_ruleinfo(Solver *solv, Id rid, Id *fromp, Id *top, Id *depp)
1674 {
1675   Pool *pool = solv->pool;
1676   Rule *r = solv->rules + rid;
1677   SolverRuleinfo type = SOLVER_RULE_UNKNOWN;
1678
1679   if (fromp)
1680     *fromp = 0;
1681   if (top)
1682     *top = 0;
1683   if (depp)
1684     *depp = 0;
1685   if (rid > 0 && rid < solv->rpmrules_end)
1686     {
1687       Queue rq;
1688       int i;
1689
1690       if (r->p >= 0)
1691         return SOLVER_RULE_RPM;
1692       if (fromp)
1693         *fromp = -r->p;
1694       queue_init(&rq);
1695       queue_push(&rq, rid);
1696       solv->ruleinfoq = &rq;
1697       solver_addrpmrulesforsolvable(solv, pool->solvables - r->p, 0);
1698       /* also try reverse direction for conflicts */
1699       if ((r->d == 0 || r->d == -1) && r->w2 < 0)
1700         solver_addrpmrulesforsolvable(solv, pool->solvables - r->w2, 0);
1701       solv->ruleinfoq = 0;
1702       type = SOLVER_RULE_RPM;
1703       for (i = 1; i < rq.count; i += 4)
1704         {
1705           Id qt, qo, qp, qd;
1706           qt = rq.elements[i];
1707           qp = rq.elements[i + 1];
1708           qo = rq.elements[i + 2];
1709           qd = rq.elements[i + 3];
1710           if (type == SOLVER_RULE_RPM || type > qt)
1711             {
1712               type = qt;
1713               if (fromp)
1714                 *fromp = qp;
1715               if (top)
1716                 *top = qo;
1717               if (depp)
1718                 *depp = qd;
1719             }
1720         }
1721       queue_free(&rq);
1722       return type;
1723     }
1724   if (rid >= solv->jobrules && rid < solv->jobrules_end)
1725     {
1726       Id jidx = solv->ruletojob.elements[rid - solv->jobrules];
1727       if (fromp)
1728         *fromp = jidx;
1729       if (top)
1730         *top = solv->job.elements[jidx];
1731       if (depp)
1732         *depp = solv->job.elements[jidx + 1];
1733       if ((r->d == 0 || r->d == -1) && r->w2 == 0 && r->p == -SYSTEMSOLVABLE && (solv->job.elements[jidx] & SOLVER_SELECTMASK) != SOLVER_SOLVABLE_ONE_OF)
1734         return SOLVER_RULE_JOB_NOTHING_PROVIDES_DEP;
1735       return SOLVER_RULE_JOB;
1736     }
1737   if (rid >= solv->updaterules && rid < solv->updaterules_end)
1738     {
1739       if (fromp)
1740         *fromp = solv->installed->start + (rid - solv->updaterules);
1741       return SOLVER_RULE_UPDATE;
1742     }
1743   if (rid >= solv->featurerules && rid < solv->featurerules_end)
1744     {
1745       if (fromp)
1746         *fromp = solv->installed->start + (rid - solv->featurerules);
1747       return SOLVER_RULE_FEATURE;
1748     }
1749   if (rid >= solv->duprules && rid < solv->duprules_end)
1750     {
1751       if (fromp)
1752         *fromp = -r->p;
1753       if (depp)
1754         *depp = pool->solvables[-r->p].name;
1755       return SOLVER_RULE_DISTUPGRADE;
1756     }
1757   if (rid >= solv->infarchrules && rid < solv->infarchrules_end)
1758     {
1759       if (fromp)
1760         *fromp = -r->p;
1761       if (depp)
1762         *depp = pool->solvables[-r->p].name;
1763       return SOLVER_RULE_INFARCH;
1764     }
1765   if (rid >= solv->choicerules && rid < solv->choicerules_end)
1766     {
1767       return SOLVER_RULE_CHOICE;
1768     }
1769   if (rid >= solv->learntrules)
1770     {
1771       return SOLVER_RULE_LEARNT;
1772     }
1773   return SOLVER_RULE_UNKNOWN;
1774 }
1775
1776 void
1777 addchoicerules(Solver *solv)
1778 {
1779   Pool *pool = solv->pool;
1780   Map m;
1781   Rule *r;
1782   Queue q, qi;
1783   int i, j, rid, havechoice;
1784   Id p, d, *pp;
1785   Id p2, pp2;
1786   Solvable *s, *s2;
1787
1788   solv->choicerules = solv->nrules;
1789   if (!pool->installed)
1790     {
1791       solv->choicerules_end = solv->nrules;
1792       return;
1793     }
1794   solv->choicerules_ref = sat_calloc(solv->rpmrules_end, sizeof(Id));
1795   queue_init(&q);
1796   queue_init(&qi);
1797   map_init(&m, pool->nsolvables);
1798   for (rid = 1; rid < solv->rpmrules_end ; rid++)
1799     {
1800       r = solv->rules + rid;
1801       if (r->p >= 0 || ((r->d == 0 || r->d == -1) && r->w2 < 0))
1802         continue;       /* only look at requires rules */
1803       // solver_printrule(solv, SAT_DEBUG_RESULT, r);
1804       queue_empty(&q);
1805       queue_empty(&qi);
1806       havechoice = 0;
1807       FOR_RULELITERALS(p, pp, r)
1808         {
1809           if (p < 0)
1810             continue;
1811           s = pool->solvables + p;
1812           if (!s->repo)
1813             continue;
1814           if (s->repo == pool->installed)
1815             {
1816               queue_push(&q, p);
1817               continue;
1818             }
1819           /* check if this package is "blocked" by a installed package */
1820           s2 = 0;
1821           FOR_PROVIDES(p2, pp2, s->name)
1822             {
1823               s2 = pool->solvables + p2;
1824               if (s2->repo != pool->installed)
1825                 continue;
1826               if (!pool->implicitobsoleteusesprovides && s->name != s2->name)
1827                 continue;
1828               if (pool->obsoleteusescolors && !pool_colormatch(pool, s, s2))
1829                 continue;
1830               break;
1831             }
1832           if (p2)
1833             {
1834               /* found installed package */
1835               if (!solv->allowarchchange && s->arch != s2->arch && policy_illegal_archchange(solv, s, s2))
1836                 continue;
1837               if (!solv->allowvendorchange && s->vendor != s2->vendor && policy_illegal_vendorchange(solv, s, s2))
1838                 continue;
1839               queue_push(&qi, p2);
1840               queue_push(&q, p);
1841               continue;
1842             }
1843           if (s->obsoletes)
1844             {
1845               Id obs, *obsp = s->repo->idarraydata + s->obsoletes;
1846               s2 = 0;
1847               while ((obs = *obsp++) != 0)
1848                 {
1849                   FOR_PROVIDES(p2, pp2, obs)
1850                     {
1851                       s2 = pool->solvables + p2;
1852                       if (s2->repo != pool->installed)
1853                         continue;
1854                       if (!pool->obsoleteusesprovides && !pool_match_nevr(pool, pool->solvables + p2, obs))
1855                         continue;
1856                       if (pool->obsoleteusescolors && !pool_colormatch(pool, s, s2))
1857                         continue;
1858                       break;
1859                     }
1860                   if (p2)
1861                     break;
1862                 }
1863               if (obs)
1864                 {
1865                   /* found one */
1866                   if (!solv->allowarchchange && s->arch != s2->arch && policy_illegal_archchange(solv, s, s2))
1867                     continue;
1868                   if (!solv->allowvendorchange && s->vendor != s2->vendor && policy_illegal_vendorchange(solv, s, s2))
1869                     continue;
1870                   queue_push(&qi, p2);
1871                   queue_push(&q, p);
1872                   continue;
1873                 }
1874             }
1875           /* this package is independent if the installed ones */
1876           havechoice = 1;
1877         }
1878       if (!havechoice || !q.count)
1879         continue;       /* no choice */
1880
1881       /* now check the update rules of the installed package.
1882        * if all packages of the update rules are contained in
1883        * the dependency rules, there's no need to set up the choice rule */
1884       map_empty(&m);
1885       FOR_RULELITERALS(p, pp, r)
1886         if (p > 0)
1887           MAPSET(&m, p);
1888       for (i = 0; i < qi.count; i++)
1889         {
1890           if (!qi.elements[i])
1891             continue;
1892           Rule *ur = solv->rules + solv->updaterules + (qi.elements[i] - pool->installed->start);
1893           if (!ur->p)
1894             ur = solv->rules + solv->featurerules + (qi.elements[i] - pool->installed->start);
1895           if (!ur->p)
1896             continue;
1897           FOR_RULELITERALS(p, pp, ur)
1898             if (!MAPTST(&m, p))
1899               break;
1900           if (p)
1901             break;
1902           for (j = i + 1; j < qi.count; j++)
1903             if (qi.elements[i] == qi.elements[j])
1904               qi.elements[j] = 0;
1905         }
1906       if (i == qi.count)
1907         {
1908 #if 0
1909           printf("skipping choice ");
1910           solver_printrule(solv, SAT_DEBUG_RESULT, solv->rules + rid);
1911 #endif
1912           continue;
1913         }
1914       d = q.count ? pool_queuetowhatprovides(pool, &q) : 0;
1915       solver_addrule(solv, r->p, d);
1916       queue_push(&solv->weakruleq, solv->nrules - 1);
1917       solv->choicerules_ref[solv->nrules - 1 - solv->choicerules] = rid;
1918 #if 0
1919       printf("OLD ");
1920       solver_printrule(solv, SAT_DEBUG_RESULT, solv->rules + rid);
1921       printf("WEAK CHOICE ");
1922       solver_printrule(solv, SAT_DEBUG_RESULT, solv->rules + solv->nrules - 1);
1923 #endif
1924     }
1925   queue_free(&q);
1926   queue_free(&qi);
1927   map_free(&m);
1928   solv->choicerules_end = solv->nrules;
1929 }
1930
1931 /* called when a choice rule is disabled by analyze_unsolvable. We also
1932  * have to disable all other choice rules so that the best packages get
1933  * picked */
1934
1935 void
1936 disablechoicerules(Solver *solv, Rule *r)
1937 {
1938   Id rid, p, *pp;
1939   Pool *pool = solv->pool;
1940   Map m;
1941   Rule *or;
1942
1943   or = solv->rules + solv->choicerules_ref[(r - solv->rules) - solv->choicerules];
1944   map_init(&m, pool->nsolvables);
1945   FOR_RULELITERALS(p, pp, or)
1946     if (p > 0)
1947       MAPSET(&m, p);
1948   FOR_RULELITERALS(p, pp, r)
1949     if (p > 0)
1950       MAPCLR(&m, p);
1951   for (rid = solv->choicerules; rid < solv->choicerules_end; rid++)
1952     {
1953       r = solv->rules + rid;
1954       if (r->d < 0)
1955         continue;
1956       or = solv->rules + solv->choicerules_ref[(r - solv->rules) - solv->choicerules];
1957       FOR_RULELITERALS(p, pp, or)
1958         if (p > 0 && MAPTST(&m, p))
1959           break;
1960       if (p)
1961         solver_disablerule(solv, r);
1962     }
1963 }
1964
1965 /* EOF */