2 * Copyright (c) 2007, Novell Inc.
4 * This program is licensed under the BSD license, read LICENSE.BSD
5 * for further information
13 #ifndef SATSOLVER_SOLVER_H
14 #define SATSOLVER_SOLVER_H
16 #include "pooltypes.h"
22 * Callback definitions in order to "overwrite" the policies by an external application.
25 typedef void (*BestSolvableCb) (Pool *pool, Queue *canditates);
26 typedef int (*ArchCheckCb) (Pool *pool, Solvable *solvable1, Solvable *solvable2);
27 typedef int (*VendorCheckCb) (Pool *pool, Solvable *solvable1, Solvable *solvable2);
28 typedef void (*UpdateCandidateCb) (Pool *pool, Solvable *solvable, Queue *canditates);
31 /* ----------------------------------------------
34 * providerN(B) == Package Id of package providing tag B
35 * N = 1, 2, 3, in case of multiple providers
37 * A requires B : !A | provider1(B) | provider2(B)
39 * A conflicts B : (!A | !provider1(B)) & (!A | !provider2(B)) ...
41 * 'not' is encoded as a negative Id
43 * Binary rule: p = first literal, d = 0, w2 = second literal, w1 = p
47 Id p; /* first literal in rule */
48 Id d; /* Id offset into 'list of providers terminated by 0' as used by whatprovides; pool->whatprovides + d */
49 /* in case of binary rules, d == 0, w1 == p, w2 == other literal */
50 Id w1, w2; /* watches, literals not-yet-decided */
51 /* if !w1, disabled */
52 /* if !w2, assertion, not rule */
53 Id n1, n2; /* next rules in linked list, corresponding to w1,w2 */
58 typedef struct solver {
62 Rule *rules; /* all rules */
63 Id nrules; /* index of the last rule */
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 */
70 Id *weaksystemrules; /* please try to install (r->d) */
71 Map noupdate; /* don't try to update these
72 installed solvables */
74 Id *watches; /* Array of rule offsets
75 * watches has nsolvables*2 entries and is addressed from the middle
76 * middle-solvable : decision to conflict, offset point to linked-list of rules
77 * middle+solvable : decision to install: offset point to linked-list of rules
84 Queue decisionq_why; /* index of rule, Offset into rules */
85 int directdecisions; /* number of decisions with no rule */
87 Id *decisionmap; /* map for all available solvables, > 0: level of decision when installed, < 0 level of decision when conflict */
89 /* learnt rule history */
94 int (*solution_callback)(struct solver *solv, void *data);
95 void *solution_callback_data;
100 Queue recommendations; /* recommended packages */
101 Queue suggestions; /* suggested packages */
104 Map recommendsmap; /* recommended packages from decisionmap */
105 Map suggestsmap; /* suggested packages from decisionmap */
106 int recommends_index; /* recommendsmap/suggestsmap is created up to this level */
108 Id *obsoletes; /* obsoletes for each installed solvable */
109 Id *obsoletes_data; /* data area for obsoletes */
111 Queue covenantq; /* Covenants honored by this solver (generic locks) */
113 /*-------------------------------------------------------------------------------------------------------------
114 * Solver configuration
115 *-------------------------------------------------------------------------------------------------------------*/
117 int fixsystem; /* repair errors in rpm dependency graph */
118 int allowdowngrade; /* allow to downgrade installed solvable */
119 int allowarchchange; /* allow to change architecture of installed solvables */
120 int allowvendorchange; /* allow to change vendor of installed solvables */
121 int allowuninstall; /* allow removal of installed solvables */
122 int updatesystem; /* distupgrade */
123 int allowvirtualconflicts; /* false: conflicts on package name, true: conflicts on package provides */
124 int noupdateprovide; /* true: update packages needs not to provide old package */
125 int dosplitprovides; /* true: consider legacy split provides */
126 int dontinstallrecommended; /* true: do not install recommended packages */
128 /* Callbacks for defining the bahaviour of the SAT solver */
130 /* Finding best candidate
132 * Callback definition:
133 * void bestSolvable (Pool *pool, Queue *canditates)
134 * candidates : List of canditates which has to be sorted by the function call
135 * return candidates: Sorted list of the candidates(first is the best).
137 BestSolvableCb bestSolvableCb;
139 /* Checking if two solvables has compatible architectures
141 * Callback definition:
142 * int archCheck (Pool *pool, Solvable *solvable1, Solvable *solvable2);
144 * return 0 it the two solvables has compatible architectures
146 ArchCheckCb archCheckCb;
148 /* Checking if two solvables has compatible vendors
150 * Callback definition:
151 * int vendorCheck (Pool *pool, Solvable *solvable1, Solvable *solvable2);
153 * return 0 it the two solvables has compatible architectures
155 VendorCheckCb vendorCheckCb;
157 /* Evaluate update candidate
159 * Callback definition:
160 * void pdateCandidateCb (Pool *pool, Solvable *solvable, Queue *canditates)
161 * solvable : for which updates should be search
162 * candidates : List of candidates (This list depends on other
163 * restrictions like architecture and vendor policies too)
165 UpdateCandidateCb updateCandidateCb;
176 SOLVER_INSTALL_SOLVABLE,
177 SOLVER_ERASE_SOLVABLE,
178 SOLVER_INSTALL_SOLVABLE_NAME,
179 SOLVER_ERASE_SOLVABLE_NAME,
180 SOLVER_INSTALL_SOLVABLE_PROVIDES,
181 SOLVER_ERASE_SOLVABLE_PROVIDES,
182 SOLVER_INSTALL_SOLVABLE_UPDATE
186 SOLVER_PROBLEM_UPDATE_RULE,
187 SOLVER_PROBLEM_JOB_RULE,
188 SOLVER_PROBLEM_JOB_NOTHING_PROVIDES_DEP,
189 SOLVER_PROBLEM_NOT_INSTALLABLE,
190 SOLVER_PROBLEM_NOTHING_PROVIDES_DEP,
191 SOLVER_PROBLEM_SAME_NAME,
192 SOLVER_PROBLEM_PACKAGE_CONFLICT,
193 SOLVER_PROBLEM_PACKAGE_OBSOLETES,
194 SOLVER_PROBLEM_DEP_PROVIDERS_NOT_INSTALLABLE
198 extern Solver *solver_create(Pool *pool, Repo *installed);
199 extern void solver_free(Solver *solv);
200 extern void solver_solve(Solver *solv, Queue *job);
201 extern int solver_dep_installed(Solver *solv, Id dep);
202 extern int solver_splitprovides(Solver *solv, Id dep);
204 extern Id solver_next_problem(Solver *solv, Id problem);
205 extern Id solver_next_solution(Solver *solv, Id problem, Id solution);
206 extern Id solver_next_solutionelement(Solver *solv, Id problem, Id solution, Id element, Id *p, Id *rp);
207 extern Id solver_findproblemrule(Solver *solv, Id problem);
208 extern SolverProbleminfo solver_problemruleinfo(Solver *solv, Queue *job, Id rid, Id *depp, Id *sourcep, Id *targetp);
210 Id *create_decisions_obsoletesmap(Solver *solv);
212 /* debug functions, do not use */
213 void printdecisions(Solver *solv);
214 void printsolutions(Solver *solv, Queue *job);
218 solver_dep_fulfilled(Solver *solv, Id dep)
220 Pool *pool = solv->pool;
225 Reldep *rd = GETRELDEP(pool, dep);
226 if (rd->flags == REL_AND)
228 if (!solver_dep_fulfilled(solv, rd->name))
230 return solver_dep_fulfilled(solv, rd->evr);
232 if (rd->flags == REL_NAMESPACE && rd->name == NAMESPACE_SPLITPROVIDES)
233 return solver_splitprovides(solv, rd->evr);
234 if (rd->flags == REL_NAMESPACE && rd->name == NAMESPACE_INSTALLED)
235 return solver_dep_installed(solv, rd->evr);
237 FOR_PROVIDES(p, pp, dep)
239 if (solv->decisionmap[p] > 0)
246 solver_is_supplementing(Solver *solv, Solvable *s)
249 if (!s->supplements && !s->freshens)
253 supp = s->repo->idarraydata + s->supplements;
254 while ((sup = *supp++) != 0)
255 if (solver_dep_fulfilled(solv, sup))
262 supp = s->repo->idarraydata + s->freshens;
263 while ((sup = *supp++) != 0)
264 if (solver_dep_fulfilled(solv, sup))
273 solver_is_enhancing(Solver *solv, Solvable *s)
278 enhp = s->repo->idarraydata + s->enhances;
279 while ((enh = *enhp++) != 0)
280 if (solver_dep_fulfilled(solv, enh))
285 void solver_calc_changed_pkgs(Solver *solv, Queue *pkgs);
286 void solver_calc_duchanges(Solver *solv, DUChanges *mps, int nmps);
287 int solver_calc_installsizechange(Solver *solv);
290 #endif /* SATSOLVER_SOLVER_H */