src/solver.h

   1 /*
   2  * Copyright (c) 2007, Novell Inc.
   3  *
   4  * This program is licensed under the BSD license, read LICENSE.BSD
   5  * for further information
   6  */
   7
   8 /*
   9  * solver.h
  10  *
  11  */
  12
  13 #ifndef SATSOLVER_SOLVER_H
  14 #define SATSOLVER_SOLVER_H
  15
  16 #include "pooltypes.h"
  17 #include "pool.h"
  18 #include "repo.h"
  19 #include "queue.h"
  20 #include "bitmap.h"
  21
  22 /* ----------------------------------------------
  23  * Rule
  24  *
  25  *   providerN(B) == Package Id of package providing tag B
  26  *   N = 1, 2, 3, in case of multiple providers
  27  *
  28  * A requires B : !A | provider1(B) | provider2(B)
  29  *
  30  * A conflicts B : (!A | !provider1(B)) & (!A | !provider2(B)) ...
  31  *
  32  * 'not' is encoded as a negative Id
  33  *
  34  * Binary rule: p = first literal, d = 0, w2 = second literal, w1 = p
  35  */
  36
  37 typedef struct rule {
  38   Id p;                 /* first literal in rule */
  39   Id d;                 /* Id offset into 'list of providers terminated by 0' as used by whatprovides; pool->whatprovides + d */
  40                         /* in case of binary rules, d == 0, w1 == p, w2 == other literal */
  41   Id w1, w2;            /* watches, literals not-yet-decided */
  42                                        /* if !w1, disabled */
  43                                        /* if !w2, assertion, not rule */
  44   Id n1, n2;            /* next rules in linked list, corresponding to w1,w2 */
  45 } Rule;
  46
  47 struct solver;
  48
  49 typedef struct solver {
  50   Pool *pool;
  51   Repo *installed;
  52
  53   int fixsystem;                        /* repair errors in rpm dependency graph */
  54   int allowdowngrade;                   /* allow to downgrade installed solvable */
  55   int allowarchchange;                  /* allow to change architecture of installed solvables */
  56   int allowvendorchange;                /* allow to change vendor of installed solvables */
  57   int allowuninstall;                   /* allow removal of installed solvables */
  58   int updatesystem;                     /* distupgrade */
  59   int allowvirtualconflicts;            /* false: conflicts on package name, true: conflicts on package provides */
  60   int noupdateprovide;                  /* true: update packages needs not to provide old package */
  61   int dosplitprovides;                  /* true: consider legacy split provides */
  62
  63   Rule *rules;                          /* all rules */
  64   Id nrules;                            /* index of the last rule */
  65
  66   Id jobrules;                          /* user rules */
  67   Id systemrules;                       /* policy rules, e.g. keep packages installed or update. All literals > 0 */
  68   Id weakrules;                         /* rules that can be autodisabled */
  69   Id learntrules;                       /* learnt rules */
  70
  71   Id *weaksystemrules;                  /* please try to install (r->d) */
  72   Map noupdate;                         /* don't try to update these
  73                                            installed solvables */
  74
  75   Id *watches;                          /* Array of rule offsets
  76                                          * watches has nsolvables*2 entries and is addressed from the middle
  77                                          * middle-solvable : decision to conflict, offset point to linked-list of rules
  78                                          * middle+solvable : decision to install: offset point to linked-list of rules
  79                                          */
  80
  81   Queue ruletojob;
  82
  83   /* our decisions: */
  84   Queue decisionq;
  85   Queue decisionq_why;                  /* index of rule, Offset into rules */
  86   int directdecisions;                  /* number of decisions with no rule */
  87
  88   Id *decisionmap;                      /* map for all available solvables, > 0: level of decision when installed, < 0 level of decision when conflict */
  89
  90   /* learnt rule history */
  91   Queue learnt_why;
  92   Queue learnt_pool;
  93
  94   Queue branches;
  95   int (*solution_callback)(struct solver *solv, void *data);
  96   void *solution_callback_data;
  97
  98   int propagate_index;
  99
 100   Queue problems;
 101   Queue suggestions;                    /* suggested packages */
 102
 103   Map recommendsmap;                    /* recommended packages from decisionmap */
 104   Map suggestsmap;                      /* suggested packages from decisionmap */
 105   int recommends_index;                 /* recommended level */
 106
 107   Id *obsoletes;                        /* obsoletes for each installed solvable */
 108   Id *obsoletes_data;                   /* data area for obsoletes */
 109
 110 } Solver;
 111
 112 /*
 113  * queue commands
 114  */
 115
 116 typedef enum {
 117   SOLVCMD_NULL=0,
 118   SOLVER_INSTALL_SOLVABLE,
 119   SOLVER_ERASE_SOLVABLE,
 120   SOLVER_INSTALL_SOLVABLE_NAME,
 121   SOLVER_ERASE_SOLVABLE_NAME,
 122   SOLVER_INSTALL_SOLVABLE_PROVIDES,
 123   SOLVER_ERASE_SOLVABLE_PROVIDES,
 124   SOLVER_INSTALL_SOLVABLE_UPDATE
 125 } SolverCmd;
 126
 127 typedef enum {
 128   SOLVER_PROBLEM_UPDATE_RULE,
 129   SOLVER_PROBLEM_JOB_RULE,
 130   SOLVER_PROBLEM_JOB_NOTHING_PROVIDES_DEP,
 131   SOLVER_PROBLEM_NOT_INSTALLABLE,
 132   SOLVER_PROBLEM_NOTHING_PROVIDES_DEP,
 133   SOLVER_PROBLEM_SAME_NAME,
 134   SOLVER_PROBLEM_PACKAGE_CONFLICT,
 135   SOLVER_PROBLEM_PACKAGE_OBSOLETES,
 136   SOLVER_PROBLEM_DEP_PROVIDERS_NOT_INSTALLABLE
 137 } SolverProbleminfo;
 138
 139
 140 extern Solver *solver_create(Pool *pool, Repo *installed);
 141 extern void solver_free(Solver *solv);
 142 extern void solver_solve(Solver *solv, Queue *job);
 143 extern int solver_dep_installed(Solver *solv, Id dep);
 144 extern int solver_splitprovides(Solver *solv, Id dep);
 145
 146 extern Id solver_next_problem(Solver *solv, Id problem);
 147 extern Id solver_next_solution(Solver *solv, Id problem, Id solution);
 148 extern Id solver_next_solutionelement(Solver *solv, Id problem, Id solution, Id element, Id *p, Id *rp);
 149 extern Id solver_findproblemrule(Solver *solv, Id problem);
 150 extern SolverProbleminfo solver_problemruleinfo(Solver *solv, Queue *job, Id rid, Id *depp, Id *sourcep, Id *targetp);
 151
 152 Id *create_obsoletesmap(Solver *solv);
 153
 154 /* debug functions, do not use */
 155 void printdecisions(Solver *solv);
 156 void printsolutions(Solver *solv, Queue *job);
 157
 158
 159 static inline int
 160 solver_dep_fulfilled(Solver *solv, Id dep)
 161 {
 162   Pool *pool = solv->pool;
 163   Id p, *pp;
 164
 165   if (ISRELDEP(dep))
 166     {
 167       Reldep *rd = GETRELDEP(pool, dep);
 168       if (rd->flags == REL_AND)
 169         {
 170           if (!solver_dep_fulfilled(solv, rd->name))
 171             return 0;
 172           return solver_dep_fulfilled(solv, rd->evr);
 173         }
 174       if (rd->flags == REL_NAMESPACE && rd->name == NAMESPACE_SPLITPROVIDES)
 175         return solver_splitprovides(solv, rd->evr);
 176       if (rd->flags == REL_NAMESPACE && rd->name == NAMESPACE_INSTALLED)
 177         return solver_dep_installed(solv, rd->evr);
 178     }
 179   FOR_PROVIDES(p, pp, dep)
 180     {
 181       if (solv->decisionmap[p] > 0)
 182         return 1;
 183     }
 184   return 0;
 185 }
 186
 187 static inline int
 188 solver_is_supplementing(Solver *solv, Solvable *s)
 189 {
 190   Id sup, *supp;
 191   if (!s->supplements && !s->freshens)
 192     return 0;
 193   if (s->supplements)
 194     {
 195       supp = s->repo->idarraydata + s->supplements;
 196       while ((sup = *supp++) != 0)
 197         if (solver_dep_fulfilled(solv, sup))
 198           break;
 199       if (!sup)
 200         return 0;
 201     }
 202   if (s->freshens)
 203     {
 204       supp = s->repo->idarraydata + s->freshens;
 205       while ((sup = *supp++) != 0)
 206         if (solver_dep_fulfilled(solv, sup))
 207           break;
 208       if (!sup)
 209         return 0;
 210     }
 211   return 1;
 212 }
 213
 214 static inline int
 215 solver_is_enhancing(Solver *solv, Solvable *s)
 216 {
 217   Id enh, *enhp;
 218   if (!s->enhances)
 219     return 0;
 220   enhp = s->repo->idarraydata + s->enhances;
 221   while ((enh = *enhp++) != 0)
 222     if (solver_dep_fulfilled(solv, enh))
 223       return 1;
 224   return 0;
 225 }
 226
 227 #endif /* SATSOLVER_SOLVER_H */