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solver: lock early names that have only single option left 

care is needed to get the score right.
cute-signatures
Timo Teräs 2012-02-22 13:09:51 +02:00
parent 93a0f0b3cc
commit d633746892
1 changed files with 13 additions and 3 deletions
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16
src/solver.c
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@ -337,7 +337,7 @@ static unsigned int get_pinning_mask_repos(struct apk_database *db, unsigned sho
return repository_mask;
}
static void get_topology_score(
static int get_topology_score(
struct apk_solver_state *ss,
struct apk_name_state *ns,
struct apk_package *pkg,
@ -348,6 +348,7 @@ static void get_topology_score(
unsigned int repos;
unsigned short preferred_pinning, allowed_pinning;
unsigned int preferred_repos, allowed_repos;
int score_locked = TRUE;
score = (struct apk_score) {
.conflicts = ps->conflicts,
@ -369,6 +370,8 @@ static void get_topology_score(
/* not upgrading: it is not preferred to change package */
if (pkg->ipkg == NULL && ns->originally_installed)
score.non_preferred_actions++;
} else {
score_locked = FALSE;
}
repos = pkg->repos | (pkg->ipkg ? ss->db->repo_tags[pkg->ipkg->repository_tag].allowed_repos : 0);
@ -383,9 +386,12 @@ static void get_topology_score(
allowed_repos = get_pinning_mask_repos(ss->db, allowed_pinning);
if (!(repos & allowed_repos))
score.non_preferred_actions+=2;
} else {
score_locked = FALSE;
}
*_score = score;
return score_locked;
}
static int is_topology_optimum(struct apk_solver_state *ss,
@ -1086,7 +1092,7 @@ static int reconsider_name(struct apk_solver_state *ss, struct apk_name *name)
struct apk_score minscore, score;
struct apk_package *next_pkg = NULL;
unsigned int next_topology = 0, options = 0;
int i;
int i, score_locked = FALSE;
subscore(&ss->minimum_penalty, &ns->minimum_penalty);
ns->minimum_penalty = (struct apk_score) { .score = 0 };
@ -1118,7 +1124,7 @@ static int reconsider_name(struct apk_solver_state *ss, struct apk_name *name)
((pkg0->ipkg == NULL && !pkg_available(ss->db, pkg0))))
continue;
get_topology_score(ss, ns, pkg0, &pkg0_score);
score_locked = get_topology_score(ss, ns, pkg0, &pkg0_score);
/* viable alternative? */
if (cmpscore2(&score, &pkg0_score, &ss->best_score) >= 0)
@ -1145,6 +1151,10 @@ static int reconsider_name(struct apk_solver_state *ss, struct apk_name *name)
if (ns->none_excluded)
return SOLVERR_PRUNED;
return push_decision(ss, name, NULL, DECISION_ASSIGN, BRANCH_NO, FALSE);
} else if (options == 1 && score_locked && ns->none_excluded) {
dbg_printf("reconsider_name: %s: only one choice left with known score, locking.\n",
name->name);
return push_decision(ss, name, next_pkg, DECISION_ASSIGN, BRANCH_NO, FALSE);
}
ns->chosen = next_pkg;