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
20 #include "pooltypes.h"
26 * Callback definitions in order to "overwrite" the policies by an external application.
29 typedef void (*BestSolvableCb) (Pool *pool, Queue *canditates);
30 typedef int (*ArchCheckCb) (Pool *pool, Solvable *solvable1, Solvable *solvable2);
31 typedef int (*VendorCheckCb) (Pool *pool, Solvable *solvable1, Solvable *solvable2);
32 typedef void (*UpdateCandidateCb) (Pool *pool, Solvable *solvable, Queue *canditates);
35 /* ----------------------------------------------
38 * providerN(B) == Package Id of package providing tag B
39 * N = 1, 2, 3, in case of multiple providers
41 * A requires B : !A | provider1(B) | provider2(B)
43 * A conflicts B : (!A | !provider1(B)) & (!A | !provider2(B)) ...
45 * 'not' is encoded as a negative Id
47 * Binary rule: p = first literal, d = 0, w2 = second literal, w1 = p
51 Id p; /* first literal in rule */
52 Id d; /* Id offset into 'list of providers terminated by 0' as used by whatprovides; pool->whatprovides + d */
53 /* in case of binary rules, d == 0, w1 == p, w2 == other literal */
54 Id w1, w2; /* watches, literals not-yet-decided */
55 /* if !w1, disabled */
56 /* if !w2, assertion, not rule */
57 Id n1, n2; /* next rules in linked list, corresponding to w1,w2 */
62 typedef struct solver {
66 Rule *rules; /* all rules */
67 Id nrules; /* index of the last rule */
69 Id jobrules; /* user rules */
70 Id updaterules; /* policy rules, e.g. keep packages installed or update. All literals > 0 */
71 Id featurerules; /* feature rules */
72 Id learntrules; /* learnt rules */
74 Map noupdate; /* don't try to update these
75 installed solvables */
79 Id *watches; /* Array of rule offsets
80 * watches has nsolvables*2 entries and is addressed from the middle
81 * middle-solvable : decision to conflict, offset point to linked-list of rules
82 * middle+solvable : decision to install: offset point to linked-list of rules
89 Queue decisionq_why; /* index of rule, Offset into rules */
90 int directdecisions; /* number of decisions with no rule */
92 Id *decisionmap; /* map for all available solvables, > 0: level of decision when installed, < 0 level of decision when conflict */
94 /* learnt rule history */
99 int (*solution_callback)(struct solver *solv, void *data);
100 void *solution_callback_data;
105 Queue recommendations; /* recommended packages */
106 Queue suggestions; /* suggested packages */
109 Map recommendsmap; /* recommended packages from decisionmap */
110 Map suggestsmap; /* suggested packages from decisionmap */
111 int recommends_index; /* recommendsmap/suggestsmap is created up to this level */
113 Id *obsoletes; /* obsoletes for each installed solvable */
114 Id *obsoletes_data; /* data area for obsoletes */
116 /*-------------------------------------------------------------------------------------------------------------
117 * Solver configuration
118 *-------------------------------------------------------------------------------------------------------------*/
120 int fixsystem; /* repair errors in rpm dependency graph */
121 int allowdowngrade; /* allow to downgrade installed solvable */
122 int allowarchchange; /* allow to change architecture of installed solvables */
123 int allowvendorchange; /* allow to change vendor of installed solvables */
124 int allowuninstall; /* allow removal of installed solvables */
125 int updatesystem; /* distupgrade */
126 int allowvirtualconflicts; /* false: conflicts on package name, true: conflicts on package provides */
127 int allowselfconflicts; /* true: packages wich conflict with itself are installable */
128 int noupdateprovide; /* true: update packages needs not to provide old package */
129 int dosplitprovides; /* true: consider legacy split provides */
130 int dontinstallrecommended; /* true: do not install recommended packages */
131 int dontshowinstalledrecommended; /* true: do not show recommended packages that are already installed */
133 /* Callbacks for defining the bahaviour of the SAT solver */
135 /* Finding best candidate
137 * Callback definition:
138 * void bestSolvable (Pool *pool, Queue *canditates)
139 * candidates : List of canditates which has to be sorted by the function call
140 * return candidates: Sorted list of the candidates(first is the best).
142 BestSolvableCb bestSolvableCb;
144 /* Checking if two solvables has compatible architectures
146 * Callback definition:
147 * int archCheck (Pool *pool, Solvable *solvable1, Solvable *solvable2);
149 * return 0 it the two solvables has compatible architectures
151 ArchCheckCb archCheckCb;
153 /* Checking if two solvables has compatible vendors
155 * Callback definition:
156 * int vendorCheck (Pool *pool, Solvable *solvable1, Solvable *solvable2);
158 * return 0 it the two solvables has compatible architectures
160 VendorCheckCb vendorCheckCb;
162 /* Evaluate update candidate
164 * Callback definition:
165 * void pdateCandidateCb (Pool *pool, Solvable *solvable, Queue *canditates)
166 * solvable : for which updates should be search
167 * candidates : List of candidates (This list depends on other
168 * restrictions like architecture and vendor policies too)
170 UpdateCandidateCb updateCandidateCb;
173 /* some strange queue that doesn't belong here */
175 Queue covenantq; /* Covenants honored by this solver (generic locks) */
186 SOLVER_INSTALL_SOLVABLE,
187 SOLVER_ERASE_SOLVABLE,
188 SOLVER_INSTALL_SOLVABLE_NAME,
189 SOLVER_ERASE_SOLVABLE_NAME,
190 SOLVER_INSTALL_SOLVABLE_PROVIDES,
191 SOLVER_ERASE_SOLVABLE_PROVIDES,
192 SOLVER_INSTALL_SOLVABLE_UPDATE,
193 SOLVER_INSTALL_SOLVABLE_ONE_OF,
194 SOLVER_WEAKEN_SOLVABLE_DEPS,
199 SOLVER_PROBLEM_UPDATE_RULE,
200 SOLVER_PROBLEM_JOB_RULE,
201 SOLVER_PROBLEM_JOB_NOTHING_PROVIDES_DEP,
202 SOLVER_PROBLEM_NOT_INSTALLABLE,
203 SOLVER_PROBLEM_NOTHING_PROVIDES_DEP,
204 SOLVER_PROBLEM_SAME_NAME,
205 SOLVER_PROBLEM_PACKAGE_CONFLICT,
206 SOLVER_PROBLEM_PACKAGE_OBSOLETES,
207 SOLVER_PROBLEM_DEP_PROVIDERS_NOT_INSTALLABLE,
208 SOLVER_PROBLEM_SELF_CONFLICT
212 extern Solver *solver_create(Pool *pool, Repo *installed);
213 extern void solver_free(Solver *solv);
214 extern void solver_solve(Solver *solv, Queue *job);
215 extern int solver_dep_installed(Solver *solv, Id dep);
216 extern int solver_splitprovides(Solver *solv, Id dep);
218 extern Id solver_next_problem(Solver *solv, Id problem);
219 extern Id solver_next_solution(Solver *solv, Id problem, Id solution);
220 extern Id solver_next_solutionelement(Solver *solv, Id problem, Id solution, Id element, Id *p, Id *rp);
221 extern Id solver_findproblemrule(Solver *solv, Id problem);
222 extern SolverProbleminfo solver_problemruleinfo(Solver *solv, Queue *job, Id rid, Id *depp, Id *sourcep, Id *targetp);
224 /* XXX: why is this not static? */
225 Id *create_decisions_obsoletesmap(Solver *solv);
228 solver_dep_fulfilled(Solver *solv, Id dep)
230 Pool *pool = solv->pool;
235 Reldep *rd = GETRELDEP(pool, dep);
236 if (rd->flags == REL_AND)
238 if (!solver_dep_fulfilled(solv, rd->name))
240 return solver_dep_fulfilled(solv, rd->evr);
242 if (rd->flags == REL_NAMESPACE && rd->name == NAMESPACE_SPLITPROVIDES)
243 return solver_splitprovides(solv, rd->evr);
244 if (rd->flags == REL_NAMESPACE && rd->name == NAMESPACE_INSTALLED)
245 return solver_dep_installed(solv, rd->evr);
247 FOR_PROVIDES(p, pp, dep)
249 if (solv->decisionmap[p] > 0)
256 solver_is_supplementing(Solver *solv, Solvable *s)
259 if (!s->supplements && !s->freshens)
263 supp = s->repo->idarraydata + s->supplements;
264 while ((sup = *supp++) != 0)
265 if (solver_dep_fulfilled(solv, sup))
272 supp = s->repo->idarraydata + s->freshens;
273 while ((sup = *supp++) != 0)
274 if (solver_dep_fulfilled(solv, sup))
283 solver_is_enhancing(Solver *solv, Solvable *s)
288 enhp = s->repo->idarraydata + s->enhances;
289 while ((enh = *enhp++) != 0)
290 if (solver_dep_fulfilled(solv, enh))
295 void solver_calc_duchanges(Solver *solv, DUChanges *mps, int nmps);
296 int solver_calc_installsizechange(Solver *solv);
299 solver_create_state_maps(Solver *solv, Map *installedmap, Map *conflictsmap)
301 pool_create_state_maps(solv->pool, &solv->decisionq, installedmap, conflictsmap);
308 #endif /* SATSOLVER_SOLVER_H */