Imported Upstream version 0.6.22
[platform/upstream/libsolv.git] / src / policy.c
index 6287b7c..7ed52d9 100644 (file)
@@ -21,6 +21,9 @@
 #include "policy.h"
 #include "poolvendor.h"
 #include "poolarch.h"
+#include "linkedpkg.h"
+#include "cplxdeps.h"
+
 
 
 /*-----------------------------------------------------------------*/
@@ -217,38 +220,158 @@ solver_prune_to_highest_prio_per_name(Solver *solv, Queue *plist)
 }
 
 
-/*
- * prune to recommended/suggested packages.
- * does not prune installed packages (they are also somewhat recommended).
- */
+#ifdef ENABLE_COMPLEX_DEPS
+
+/* simple fixed-size hash for package ids */
+#define CPLXDEPHASH_EMPTY(elements) (memset(elements, 0, sizeof(Id) * 256))
+#define CPLXDEPHASH_SET(elements, p) (elements[(p) & 255] |= (1 << ((p) >> 8 & 31)))
+#define CPLXDEPHASH_TST(elements, p) (elements[(p) & 255] && (elements[(p) & 255] & (1 << ((p) >> 8 & 31))))
 
 static void
-prune_to_recommended(Solver *solv, Queue *plist)
+check_complex_dep(Solver *solv, Id dep, Map *m, Queue **cqp)
 {
   Pool *pool = solv->pool;
-  int i, j, k, ninst;
-  Solvable *s;
-  Id p, pp, rec, *recp, sug, *sugp;
-
-  ninst = 0;
-  if (pool->installed)
+  Queue q;
+  queue_init(&q);
+  Id p;
+  int i, qcnt;
+
+#if 0
+  printf("check_complex_dep %s\n", pool_dep2str(pool, dep));
+#endif
+  i = pool_normalize_complex_dep(pool, dep, &q, CPLXDEPS_EXPAND);
+  if (i == 0 || i == 1)
     {
-      for (i = 0; i < plist->count; i++)
+      queue_free(&q);
+      return;
+    }
+  qcnt = q.count;
+  for (i = 0; i < qcnt; i++)
+    {
+      /* we rely on the fact that blocks are ordered here.
+       * if we reach a positive element, we know that we
+       * saw all negative ones */
+      for (; (p = q.elements[i]) < 0; i++)
        {
-         p = plist->elements[i];
-         s = pool->solvables + p;
-         if (pool->installed && s->repo == pool->installed)
-           ninst++;
+         if (solv->decisionmap[-p] < 0)
+           break;
+         if (solv->decisionmap[-p] == 0)
+           queue_push(&q, -p);         /* undecided negative literal */
+       }
+      if (p <= 0)
+       {
+#if 0
+         printf("complex dep block cannot be true or no pos literals\n");
+#endif
+         while (q.elements[i])
+           i++;
+         if (qcnt != q.count)
+           queue_truncate(&q, qcnt);
+         continue;
+       }
+      if (qcnt == q.count)
+       {
+         /* all negative literals installed, add positive literals to map */
+         for (; (p = q.elements[i]) != 0; i++)
+           MAPSET(m, p);
+       }
+      else
+       {
+         /* at least one undecided negative literal, postpone */
+         int j, k;
+         Queue *cq;
+#if 0
+         printf("add new complex dep block\n");
+         for (j = qcnt; j < q.count; j++)
+           printf("  - %s\n", pool_solvid2str(pool, q.elements[j]));
+#endif
+         while (q.elements[i])
+           i++;
+         if (!(cq = *cqp))
+           {
+             cq = solv_calloc(1, sizeof(Queue));
+             queue_init(cq);
+             queue_insertn(cq, 0, 256, 0);     /* allocate hash area */
+             *cqp = cq;
+           }
+         for (j = qcnt; j < q.count; j++)
+           {
+             p = q.elements[j];
+             /* check if we already have this (dep, p) entry */
+             for (k = 256; k < cq->count; k += 2)
+               if (cq->elements[k + 1] == dep && cq->elements[k] == p)
+                 break;
+             if (k == cq->count)
+               {
+                 /* a new one. add to cq and hash */
+                 queue_push2(cq, p, dep);
+                 CPLXDEPHASH_SET(cq->elements, p);
+               }
+           }
+         queue_truncate(&q, qcnt);
        }
     }
-  if (plist->count - ninst < 2)
-    return;
+  queue_free(&q);
+}
+
+static void
+recheck_complex_deps(Solver *solv, Id p, Map *m, Queue **cqp)
+{
+  Queue *cq = *cqp;
+  Id pp;
+  int i;
+#if 0
+  printf("recheck_complex_deps for package %s\n", pool_solvid2str(solv->pool, p));
+#endif
+  /* make sure that we don't have a false hit */
+  for (i = 256; i < cq->count; i += 2)
+    if (cq->elements[i] == p)
+      break;
+  if (i == cq->count)
+    return;    /* false alert */
+  if (solv->decisionmap[p] <= 0)
+    return;    /* just in case... */
+
+  /* rebuild the hash, call check_complex_dep for our package */
+  CPLXDEPHASH_EMPTY(cq->elements);
+  for (i = 256; i < cq->count; i += 2)
+    if ((pp = cq->elements[i]) == p)
+      {
+       Id dep = cq->elements[i + 1];
+       queue_deleten(cq, i, 2);
+       i -= 2;
+        check_complex_dep(solv, dep, m, &cq);
+      }
+    else
+      CPLXDEPHASH_SET(cq->elements, pp);
+}
+
+#endif
+
+
+void
+policy_update_recommendsmap(Solver *solv)
+{
+  Pool *pool = solv->pool;
+  Solvable *s;
+  Id p, pp, rec, *recp, sug, *sugp;
 
-  /* update our recommendsmap/suggestsmap */
   if (solv->recommends_index < 0)
     {
       MAPZERO(&solv->recommendsmap);
       MAPZERO(&solv->suggestsmap);
+#ifdef ENABLE_COMPLEX_DEPS
+      if (solv->recommendscplxq)
+       {
+         queue_free(solv->recommendscplxq);
+         solv->recommendscplxq = solv_free(solv->recommendscplxq);
+       }
+      if (solv->suggestscplxq)
+       {
+         queue_free(solv->suggestscplxq);
+         solv->suggestscplxq = solv_free(solv->suggestscplxq);
+       }
+#endif
       solv->recommends_index = 0;
     }
   while (solv->recommends_index < solv->decisionq.count)
@@ -257,21 +380,191 @@ prune_to_recommended(Solver *solv, Queue *plist)
       if (p < 0)
        continue;
       s = pool->solvables + p;
+#ifdef ENABLE_COMPLEX_DEPS
+      /* re-check postponed complex blocks */
+      if (solv->recommendscplxq && CPLXDEPHASH_TST(solv->recommendscplxq->elements, p))
+        recheck_complex_deps(solv, p, &solv->recommendsmap, &solv->recommendscplxq);
+      if (solv->suggestscplxq && CPLXDEPHASH_TST(solv->suggestscplxq->elements, p))
+        recheck_complex_deps(solv, p, &solv->suggestsmap, &solv->suggestscplxq);
+#endif
       if (s->recommends)
        {
          recp = s->repo->idarraydata + s->recommends;
           while ((rec = *recp++) != 0)
-           FOR_PROVIDES(p, pp, rec)
-             MAPSET(&solv->recommendsmap, p);
+           {
+#ifdef ENABLE_COMPLEX_DEPS
+             if (pool_is_complex_dep(pool, rec))
+               {
+                 check_complex_dep(solv, rec, &solv->recommendsmap, &solv->recommendscplxq);
+                 continue;
+               }
+#endif
+             FOR_PROVIDES(p, pp, rec)
+               MAPSET(&solv->recommendsmap, p);
+           }
        }
       if (s->suggests)
        {
          sugp = s->repo->idarraydata + s->suggests;
           while ((sug = *sugp++) != 0)
-           FOR_PROVIDES(p, pp, sug)
-             MAPSET(&solv->suggestsmap, p);
+           {
+#ifdef ENABLE_COMPLEX_DEPS
+             if (pool_is_complex_dep(pool, sug))
+               {
+                 check_complex_dep(solv, sug, &solv->suggestsmap, &solv->suggestscplxq);
+                 continue;
+               }
+#endif
+             FOR_PROVIDES(p, pp, sug)
+               MAPSET(&solv->suggestsmap, p);
+           }
        }
     }
+}
+
+/* bring suggested/enhanced packages to front
+ * installed packages count as suggested */
+static void
+prefer_suggested(Solver *solv, Queue *plist)
+{
+  Pool *pool = solv->pool;
+  int i, count;
+
+  /* update our recommendsmap/suggestsmap */
+  if (solv->recommends_index < solv->decisionq.count)
+    policy_update_recommendsmap(solv);
+
+  for (i = 0, count = plist->count; i < count; i++)
+    {
+      Id p = plist->elements[i];
+      Solvable *s = pool->solvables + p;
+      if ((pool->installed && s->repo == pool->installed) ||
+          MAPTST(&solv->suggestsmap, p) ||
+          solver_is_enhancing(solv, s))
+       continue;       /* good package */
+      /* bring to back */
+     if (i < plist->count - 1)
+       {
+         memmove(plist->elements + i, plist->elements + i + 1, (plist->count - 1 - i) * sizeof(Id));
+         plist->elements[plist->count - 1] = p;
+       }
+      i--;
+      count--;
+    }
+}
+
+static int
+sort_by_favorq_cmp(const void *ap, const void *bp, void *dp)
+{
+  const Id *a = ap, *b = bp, *d = dp;
+  return d[b[0]] - d[a[0]];
+}
+
+static void
+sort_by_favorq(Queue *favorq, Id *el, int cnt)
+{
+  int i;
+  /* map to offsets into favorq */
+  for (i = 0; i < cnt; i++)
+    {
+      Id p = el[i];
+      /* lookup p in sorted favorq */
+      int med = 0, low = 0;
+      int high = favorq->count / 2;
+      while (low != high)
+       {
+         med = (low + high) / 2;
+         Id pp = favorq->elements[2 * med];
+         if (pp < p)
+           low = med;
+         else if (pp > p)
+           high = med;
+         else
+           break;
+       }
+      while(med && favorq->elements[2 * med - 2] == p)
+       med--;
+      if (favorq->elements[2 * med] == p)
+        el[i] = 2 * med + 1;
+      else
+        el[i] = 0;     /* hmm */
+    }
+  /* sort by position */
+  solv_sort(el, cnt, sizeof(Id), sort_by_favorq_cmp, favorq->elements);
+  /* map back */
+  for (i = 0; i < cnt; i++)
+    if (el[i])
+      el[i] = favorq->elements[el[i] - 1];
+}
+
+/* bring favored packages to front and disfavored packages to back */
+void
+policy_prefer_favored(Solver *solv, Queue *plist)
+{
+  int i, fav, disfav, count;
+  if (!solv->favormap.size)
+    return;
+  for (i = fav = disfav = 0, count = plist->count; i < count; i++)
+    {
+      Id p = plist->elements[i];
+      if (!MAPTST(&solv->favormap, p))
+       continue;
+      if (solv->isdisfavormap.size && MAPTST(&solv->isdisfavormap, p))
+       {
+         /* disfavored package. bring to back */
+        if (i < plist->count - 1)
+           {
+             memmove(plist->elements + i, plist->elements + i + 1, (plist->count - 1 - i) * sizeof(Id));
+             plist->elements[plist->count - 1] = p;
+           }
+         i--;
+         count--;
+         disfav++;
+       }
+      else
+       {
+         /* favored package. bring to front */
+         if (i > fav)
+           memmove(plist->elements + fav + 1, plist->elements + fav, (i - fav) * sizeof(Id));
+         plist->elements[fav++] = p;
+       }
+    }
+  /* if we have multiple favored/disfavored packages, sort by favorq index */
+  if (fav > 1)
+    sort_by_favorq(solv->favorq, plist->elements, fav);
+  if (disfav > 1)
+    sort_by_favorq(solv->favorq, plist->elements + plist->count - disfav, disfav);
+}
+
+/*
+ * prune to recommended/suggested packages.
+ * does not prune installed packages (they are also somewhat recommended).
+ */
+static void
+prune_to_recommended(Solver *solv, Queue *plist)
+{
+  Pool *pool = solv->pool;
+  int i, j, k, ninst;
+  Solvable *s;
+  Id p;
+
+  ninst = 0;
+  if (pool->installed)
+    {
+      for (i = 0; i < plist->count; i++)
+       {
+         p = plist->elements[i];
+         s = pool->solvables + p;
+         if (pool->installed && s->repo == pool->installed)
+           ninst++;
+       }
+    }
+  if (plist->count - ninst < 2)
+    return;
+
+  /* update our recommendsmap/suggestsmap */
+  if (solv->recommends_index < solv->decisionq.count)
+    policy_update_recommendsmap(solv);
 
   /* prune to recommended/supplemented */
   ninst = 0;
@@ -303,6 +596,7 @@ prune_to_recommended(Solver *solv, Queue *plist)
   if (j)
     plist->count = j;
 
+#if 0
   /* anything left to prune? */
   if (plist->count - ninst < 2)
     return;
@@ -336,6 +630,7 @@ prune_to_recommended(Solver *solv, Queue *plist)
     }
   if (j)
     plist->count = j;
+#endif
 }
 
 static void
@@ -612,10 +907,10 @@ move_installed_to_front(Pool *pool, Queue *plist)
  * sort list of packages (given through plist) by name and evr
  * return result through plist
  */
-static void
+void
 prune_to_best_version(Pool *pool, Queue *plist)
 {
-  int i, j;
+  int i, j, r;
   Solvable *s, *best;
 
   if (plist->count < 2)                /* no need to prune for a single entry */
@@ -648,12 +943,13 @@ prune_to_best_version(Pool *pool, Queue *plist)
           best = s;            /* take current as new best */
           continue;
         }
-
-      if (best->evr != s->evr) /* compare evr */
-        {
-          if (pool_evrcmp(pool, best->evr, s->evr, EVRCMP_COMPARE) < 0)
-            best = s;
-        }
+      r = best->evr != s->evr ? pool_evrcmp(pool, best->evr, s->evr, EVRCMP_COMPARE) : 0;
+#ifdef ENABLE_LINKED_PKGS
+      if (r == 0 && has_package_link(pool, s))
+        r = pool_link_evrcmp(pool, best, s);
+#endif
+      if (r < 0)
+       best = s;
     }
   plist->elements[j++] = best - pool->solvables;       /* finish last group */
   plist->count = j;
@@ -672,6 +968,359 @@ prune_to_best_version(Pool *pool, Queue *plist)
 }
 
 
+static int
+sort_by_name_evr_sortcmp(const void *ap, const void *bp, void *dp)
+{
+  Pool *pool = dp;
+  Id a, *aa = (Id *)ap;
+  Id b, *bb = (Id *)bp;
+  Id r = aa[1] - bb[1];
+  if (r)
+    return r < 0 ? -1 : 1;
+  if (aa[2] == bb[2])
+    return 0;
+  a = aa[2] < 0 ? -aa[2] : aa[2];
+  b = bb[2] < 0 ? -bb[2] : bb[2];
+  if (pool->disttype != DISTTYPE_DEB && a != b)
+    {
+      /* treat release-less versions different */
+      const char *as = pool_id2str(pool, a);
+      const char *bs = pool_id2str(pool, b);
+      if (strchr(as, '-'))
+       {
+         if (!strchr(bs, '-'))
+           return -2;
+       }
+      else
+       {
+         if (strchr(bs, '-'))
+           return 2;
+       }
+    }
+  r = pool_evrcmp(pool, b, a, EVRCMP_COMPARE);
+  if (!r && (aa[2] < 0 || bb[2] < 0))
+    {
+      if (bb[2] >= 0)
+       return 1;
+      if (aa[2] >= 0)
+       return -1;
+    }
+  if (r)
+    return r < 0 ? -1 : 1;
+  return 0;
+}
+
+/* common end of sort_by_srcversion and sort_by_common_dep */
+static void
+sort_by_name_evr_array(Pool *pool, Queue *plist, int count, int ent)
+{
+  Id lastname;
+  int i, j, bad, havebad;
+  Id *pp, *elements = plist->elements;
+
+  if (ent < 2)
+    {
+      queue_truncate(plist, count);
+      return;
+    }
+  solv_sort(elements + count * 2, ent, sizeof(Id) * 3, sort_by_name_evr_sortcmp, pool);
+  lastname = 0;
+  bad = havebad = 0;
+  for (i = 0, pp = elements + count * 2; i < ent; i++, pp += 3)
+    {
+      if (lastname && pp[1] == lastname)
+       {
+          if (pp[0] != pp[-3] && sort_by_name_evr_sortcmp(pp - 3, pp, pool) == -1)
+           {
+#if 0
+             printf("%s - %s: bad %s %s - %s\n", pool_solvid2str(pool, elements[pp[-3]]), pool_solvid2str(pool, elements[pp[0]]), pool_dep2str(pool, lastname), pool_id2str(pool, pp[-1] < 0 ? -pp[-1] : pp[-1]), pool_id2str(pool, pp[2] < 0 ? -pp[2] : pp[2]));
+#endif
+             bad++;
+             havebad = 1;
+           }
+       }
+      else
+       {
+         bad = 0;
+         lastname = pp[1];
+       }
+      elements[count + pp[0]] += bad;
+    }
+
+#if 0
+for (i = 0; i < count; i++)
+  printf("%s badness %d\n", pool_solvid2str(pool, elements[i]), elements[count + i]);
+#endif
+
+  if (havebad)
+    {
+      /* simple stable insertion sort */
+      if (pool->installed)
+       for (i = 0; i < count; i++)
+         if (pool->solvables[elements[i]].repo == pool->installed)
+           elements[i + count] = 0;
+      for (i = 1; i < count; i++)
+       for (j = i, pp = elements + count + j; j > 0; j--, pp--)
+         if (pp[-1] > pp[0])
+           {
+             Id *pp2 = pp - count;
+             Id p = pp[-1];
+             pp[-1] = pp[0];
+             pp[0] = p;
+             p = pp2[-1];
+             pp2[-1] = pp2[0];
+             pp2[0] = p;
+           }
+         else
+           break;
+    }
+  queue_truncate(plist, count);
+}
+
+#if 0
+static void
+sort_by_srcversion(Pool *pool, Queue *plist)
+{
+  int i, count = plist->count, ent = 0;
+  queue_insertn(plist, count, count, 0);
+  for (i = 0; i < count; i++)
+    {
+      Id name, evr, p = plist->elements[i];
+      Solvable *s = pool->solvables + p;
+      if (solvable_lookup_void(s, SOLVABLE_SOURCENAME))
+       name = s->name;
+      else
+        name = solvable_lookup_id(s, SOLVABLE_SOURCENAME);
+      if (solvable_lookup_void(s, SOLVABLE_SOURCEEVR))
+       evr = s->evr;
+      else
+        evr = solvable_lookup_id(s, SOLVABLE_SOURCEEVR);
+      if (!name || !evr || ISRELDEP(evr))
+       continue;
+      queue_push(plist, i);
+      queue_push2(plist, name, evr);
+      ent++;
+    }
+  sort_by_name_evr_array(pool, plist, count, ent);
+}
+#endif
+
+static void
+sort_by_common_dep(Pool *pool, Queue *plist)
+{
+  int i, count = plist->count, ent = 0;
+  Id id, *dp;
+  queue_insertn(plist, count, count, 0);
+  for (i = 0; i < count; i++)
+    {
+      Id p = plist->elements[i];
+      Solvable *s = pool->solvables + p;
+      if (!s->provides)
+       continue;
+      for (dp = s->repo->idarraydata + s->provides; (id = *dp++) != 0; )
+       {
+         Reldep *rd;
+         if (!ISRELDEP(id))
+           continue;
+         rd = GETRELDEP(pool, id);
+         if ((rd->flags == REL_EQ || rd->flags == (REL_EQ | REL_LT) || rd->flags == REL_LT) && !ISRELDEP(rd->evr))
+           {
+             if (rd->flags == REL_EQ)
+               {
+                 /* ignore hashes */
+                 const char *s = pool_id2str(pool, rd->evr);
+                 if (strlen(s) >= 4)
+                   {
+                     while ((*s >= 'a' && *s <= 'f') || (*s >= '0' && *s <= '9'))
+                       s++;
+                     if (!*s)
+                       continue;
+                   }
+               }
+             queue_push(plist, i);
+             queue_push2(plist, rd->name, rd->flags == REL_LT ? -rd->evr : rd->evr);
+             ent++;
+           }
+       }
+    }
+  sort_by_name_evr_array(pool, plist, count, ent);
+}
+
+/* check if we have an update candidate */
+static void
+dislike_old_versions(Pool *pool, Queue *plist)
+{
+  int i, count;
+
+  for (i = 0, count = plist->count; i < count; i++)
+    {
+      Id p = plist->elements[i];
+      Solvable *s = pool->solvables + p;
+      Repo *repo = s->repo;
+      Id q, qq;
+      int bad = 0;
+
+      if (!repo || repo == pool->installed)
+       continue;
+      FOR_PROVIDES(q, qq, s->name)
+       {
+         Solvable *qs = pool->solvables + q;
+         if (q == p)
+           continue;
+         if (s->name != qs->name || s->arch != qs->arch)
+           continue;
+         if (repo->priority != qs->repo->priority)
+           {
+             if (repo->priority > qs->repo->priority)
+               continue;
+             bad = 1;
+             break;
+           }
+         if (pool_evrcmp(pool, qs->evr, s->evr, EVRCMP_COMPARE) > 0)
+           {
+             bad = 1;
+             break;
+           }
+       }
+      if (!bad)
+       continue;
+      /* bring to back */
+      if (i < plist->count - 1)
+       {
+         memmove(plist->elements + i, plist->elements + i + 1, (plist->count - 1 - i) * sizeof(Id));
+         plist->elements[plist->count - 1] = p;
+       }
+      i--;
+      count--;
+    }
+}
+
+
+/* special lang package handling for urpm */
+/* see https://bugs.mageia.org/show_bug.cgi?id=18315 */
+
+static int
+urpm_reorder_cmp(const void *ap, const void *bp, void *dp)
+{
+  return ((Id *)bp)[1] - ((Id *)ap)[1];
+}
+
+static void
+urpm_reorder(Solver *solv, Queue *plist)
+{
+  Pool *pool = solv->pool;
+  int i, count = plist->count;
+  /* add locale score to packages */
+  queue_insertn(plist, count, count, 0);
+  for (i = count - 1; i >= 0; i--)
+    {
+      Solvable *s = pool->solvables + plist->elements[i];
+      int score = 1;
+      const char *sn = pool_id2str(pool, s->name);
+
+      if (!strncmp(sn, "kernel-", 7))
+       {
+         const char *devel = strstr(sn, "-devel-");
+         if (devel && strlen(sn) < 256)
+           {
+             char kn[256];
+             Id p, pp, knid;
+             memcpy(kn, sn, devel - sn);
+             strcpy(kn + (devel - sn), devel + 6);
+             knid = pool_str2id(pool, kn, 0);
+             if (knid)
+               {
+                 FOR_PROVIDES(p, pp, knid)
+                   {
+                     if (solv->decisionmap[p] > 0)
+                       {
+                         score = 4;
+                         break;
+                       }
+                     else if (pool->installed && pool->solvables[p].repo == pool->installed)
+                       score = 3;
+                   }
+               }
+           }
+       }
+      else if ((sn = strstr(sn, "-kernel-")) != 0)
+       {
+         sn += 8;
+         if (strlen(sn) < 256 - 8 && *sn >= '0' && *sn <= '9' && sn[1] == '.')
+           {
+             const char *flavor = strchr(sn, '-');
+             if (flavor)
+               {
+                 const char *release = strchr(flavor + 1, '-');
+                 if (release)
+                   {
+                     char kn[256];
+                     Id p, pp, knid;
+                     memcpy(kn, "kernel", 8);
+                     memcpy(kn + 6, flavor, release - flavor + 1);
+                     memcpy(kn + 6 + (release - flavor) + 1, sn, flavor - sn);
+                     strcpy(kn + 6 + (release + 1 - sn), release);
+                     knid = pool_str2id(pool, kn, 0);
+                     if (knid)
+                       {
+                         FOR_PROVIDES(p, pp, knid)
+                           {
+                             if (solv->decisionmap[p] > 0)
+                               {
+                                 score = 4;
+                                 break;
+                               }
+                             if (pool->installed && pool->solvables[p].repo == pool->installed)
+                               score = 3;
+                           }
+                       }
+                   }
+               }
+           }
+       }
+      if (score == 1 && s->requires)
+       {
+         Id id, *idp, p, pp;
+         const char *deps;
+         for (idp = s->repo->idarraydata + s->requires; (id = *idp) != 0; idp++)
+           {
+             while (ISRELDEP(id))
+               {
+                 Reldep *rd = GETRELDEP(pool, id);
+                 id = rd->name;
+               }
+             deps = strstr(pool_id2str(pool, id), "locales-");
+             if (!deps)
+               continue;
+             if (!strncmp(deps + 8, "en", 2))
+               score = 2;
+             else
+               {
+                 score = 0;
+                 FOR_PROVIDES(p, pp, id)
+                   {
+                     if (solv->decisionmap[p] > 0)
+                       {
+                         score = 4;
+                         break;
+                       }
+                     if (pool->installed && pool->solvables[p].repo == pool->installed)
+                       score = 3;
+                   }
+                 break;
+               }
+           }
+       }
+      plist->elements[i * 2] = plist->elements[i];
+      plist->elements[i * 2 + 1] = score;
+    }
+  solv_sort(plist->elements, count, sizeof(Id) * 2, urpm_reorder_cmp, pool);
+  for (i = 0; i < count; i++)
+    plist->elements[i] = plist->elements[2 * i];
+  queue_truncate(plist, count);
+}
+
+
 /*
  *  POLICY_MODE_CHOOSE:     default, do all pruning steps
  *  POLICY_MODE_RECOMMEND:  leave out prune_to_recommended
@@ -681,6 +1330,17 @@ void
 policy_filter_unwanted(Solver *solv, Queue *plist, int mode)
 {
   Pool *pool = solv->pool;
+  if (mode == POLICY_MODE_SUPPLEMENT)
+    {
+      /* reorder only */
+      dislike_old_versions(pool, plist);
+      sort_by_common_dep(pool, plist);
+      if (solv->urpmreorder)
+        urpm_reorder(solv, plist);
+      prefer_suggested(solv, plist);
+      policy_prefer_favored(solv, plist);
+      return;
+    }
   if (plist->count > 1)
     {
       if (mode != POLICY_MODE_SUGGEST)
@@ -692,8 +1352,23 @@ policy_filter_unwanted(Solver *solv, Queue *plist, int mode)
     prune_to_best_arch(pool, plist);
   if (plist->count > 1)
     prune_to_best_version(pool, plist);
-  if (plist->count > 1 && mode == POLICY_MODE_CHOOSE)
-    prune_to_recommended(solv, plist);
+  if (plist->count > 1 && (mode == POLICY_MODE_CHOOSE || mode == POLICY_MODE_CHOOSE_NOREORDER))
+    {
+      prune_to_recommended(solv, plist);
+      if (plist->count > 1 && mode != POLICY_MODE_CHOOSE_NOREORDER)
+       {
+         /* do some fancy reordering */
+#if 0
+         sort_by_srcversion(pool, plist);
+#endif
+         dislike_old_versions(pool, plist);
+         sort_by_common_dep(pool, plist);
+         if (solv->urpmreorder)
+           urpm_reorder(solv, plist);
+         prefer_suggested(solv, plist);
+         policy_prefer_favored(solv, plist);
+       }
+    }
 }
 
 
@@ -906,14 +1581,20 @@ policy_findupdatepackages(Solver *solv, Solvable *s, Queue *qs, int allow_all)
       ps = pool->solvables + p;
       if (s->name == ps->name) /* name match */
        {
-         /* XXX: check implicitobsoleteusescolors? */
+         if (pool->implicitobsoleteusescolors && !pool_colormatch(pool, s, ps))
+           continue;
          if (!allowdowngrade && pool_evrcmp(pool, s->evr, ps->evr, EVRCMP_COMPARE) > 0)
            continue;
        }
       else if (!allownamechange)
        continue;
-      else if (!solv->noupdateprovide && ps->obsoletes)   /* provides/obsoletes combination ? */
+      else if ((!solv->noupdateprovide || solv->needupdateprovide) && ps->obsoletes)   /* provides/obsoletes combination ? */
        {
+         /* check if package ps obsoletes installed package s */
+         /* implicitobsoleteusescolors is somewhat wrong here, but we nevertheless
+          * use it to limit our update candidates */
+         if ((pool->obsoleteusescolors || pool->implicitobsoleteusescolors) && !pool_colormatch(pool, s, ps))
+           continue;
          obsp = ps->repo->idarraydata + ps->obsoletes;
          while ((obs = *obsp++) != 0)  /* for all obsoletes */
            {
@@ -922,8 +1603,6 @@ policy_findupdatepackages(Solver *solv, Solvable *s, Queue *qs, int allow_all)
                  Solvable *ps2 = pool->solvables + p2;
                  if (!pool->obsoleteusesprovides && !pool_match_nevr(pool, ps2, obs))
                    continue;
-                 if (pool->obsoleteusescolors && !pool_colormatch(pool, s, ps2))
-                   continue;
                  if (p2 == n)          /* match ! */
                    break;
                }
@@ -949,7 +1628,7 @@ policy_findupdatepackages(Solver *solv, Solvable *s, Queue *qs, int allow_all)
     return;
   /* if we have found some valid candidates and noupdateprovide is not set, we're
      done. otherwise we fallback to all obsoletes */
-  if (!solv->noupdateprovide && haveprovobs)
+  if (solv->needupdateprovide || (!solv->noupdateprovide && haveprovobs))
     return;
   if (solv->obsoletes && solv->obsoletes[n - solv->installed->start])
     {
@@ -961,6 +1640,10 @@ policy_findupdatepackages(Solver *solv, Solvable *s, Queue *qs, int allow_all)
            continue;
          if (!allowvendorchange && s->vendor != ps->vendor && policy_illegal_vendorchange(solv, s, ps))
            continue;
+         /* implicitobsoleteusescolors is somewhat wrong here, but we nevertheless
+          * use it to limit our update candidates */
+         if (pool->implicitobsoleteusescolors && !pool_colormatch(pool, s, ps))
+           continue;
          queue_push(qs, p);
        }
     }