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 SOLVER_H
  14 #define 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
  62   Rule *rules;                          /* all rules */
  63   Id nrules;                            /* rpm rules */
  64
  65   Id jobrules;                          /* user rules */
  66   Id systemrules;                       /* policy rules, e.g. keep packages installed or update. All literals > 0 */
  67   Id weakrules;                         /* rules that can be autodisabled */
  68   Id learntrules;                       /* learnt rules */
  69
  70   Id *weaksystemrules;                  /* please try to install (r->d) */
  71
  72   Id *watches;                          /* Array of rule offsets
  73                                          * watches has nsolvables*2 entries and is addressed from the middle
  74                                          * middle-solvable : decision to conflict, offset point to linked-list of rules
  75                                          * middle+solvable : decision to install: offset point to linked-list of rules
  76                                          */
  77
  78   Queue ruletojob;
  79
  80   /* our decisions: */
  81   Queue decisionq;
  82   Queue decisionq_why;                  /* index of rule, Offset into rules */
  83   Id *decisionmap;                      /* map for all available solvables, > 0: level of decision when installed, < 0 level of decision when conflict */
  84
  85   /* learnt rule history */
  86   Queue learnt_why;
  87   Queue learnt_pool;
  88
  89   Queue branches;
  90   int (*solution_callback)(struct solver *solv, void *data);
  91   void *solution_callback_data;
  92
  93   int propagate_index;
  94
  95   Queue problems;
  96   Queue suggestions;                    /* suggested packages */
  97
  98   Map recommendsmap;                    /* recommended packages from decisionmap */
  99   Map suggestsmap;                      /* suggested packages from decisionmap */
 100   int recommends_index;                 /* recommended level */
 101
 102   Id *obsoletes;                        /* obsoletes for each installed solvable */
 103   Id *obsoletes_data;                   /* data area for obsoletes */
 104
 105   int rc_output;                        /* output result compatible to redcarpet/zypp testsuite, set == 2 for pure rc (will suppress architecture) */
 106 } Solver;
 107
 108 /*
 109  * queue commands
 110  */
 111
 112 enum solvcmds {
 113   SOLVCMD_NULL=0,
 114   SOLVER_INSTALL_SOLVABLE,
 115   SOLVER_ERASE_SOLVABLE,
 116   SOLVER_INSTALL_SOLVABLE_NAME,
 117   SOLVER_ERASE_SOLVABLE_NAME,
 118   SOLVER_INSTALL_SOLVABLE_PROVIDES,
 119   SOLVER_ERASE_SOLVABLE_PROVIDES,
 120   SOLVER_INSTALL_SOLVABLE_UPDATE
 121 } SolverCmd;
 122
 123 extern Solver *solver_create(Pool *pool, Repo *installed);
 124 extern void solver_free(Solver *solv);
 125 extern void solve(Solver *solv, Queue *job);
 126
 127 extern void prune_best_version_arch(Pool *pool, Queue *plist);
 128
 129 void printdecisions(Solver *solv);
 130
 131 void refine_suggestion(Solver *solv, Id *problem, Id sug, Queue *refined);
 132 int archchanges(Pool *pool, Solvable *s1, Solvable *s2);
 133
 134 #endif /* SOLVER_H */