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/*
* Copyright (c) 2007, Novell Inc.
*
* This program is licensed under the BSD license, read LICENSE.BSD
* for further information
*/

/*
* Generic policy interface for SAT solver
*
*/

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>

#include "solver.h"
#include "solver_private.h"
#include "evr.h"
#include "policy.h"
#include "poolvendor.h"
#include "poolarch.h"
#include "cplxdeps.h"


/*-----------------------------------------------------------------*/

/*
* prep for prune_best_version
* sort by name
*/

static int
prune_to_best_version_sortcmp(const void *ap, const void *bp, void *dp)
{
  Pool *pool = dp;
  int r;
  Id a = *(Id *)ap;
  Id b = *(Id *)bp;
  Solvable *sa, *sb;

  sa = pool->solvables + a;
  sb = pool->solvables + b;
  r = sa->name - sb->name;
  if (r)
    {
      const char *na, *nb;
      /* different names. We use real strcmp here so that the result
* is not depending on some random solvable order */
      na = pool_id2str(pool, sa->name);
      nb = pool_id2str(pool, sb->name);
      return strcmp(na, nb);
    }
  if (sa->arch != sb->arch)
    {
      int aa, ab;
      aa = (sa->arch <= pool->lastarch) ? pool->id2arch[sa->arch] : 0;
      ab = (sb->arch <= pool->lastarch) ? pool->id2arch[sb->arch] : 0;
      if (aa != ab && aa > 1 && ab > 1)
return aa - ab; /* lowest score first */
    }

  /* the same name, bring installed solvables to the front */
  if (pool->installed)
    {
      if (sa->repo == pool->installed)
{
if (sb->repo != pool->installed)
return -1;
}
      else if (sb->repo == pool->installed)
return 1;
    }
  /* sort by repository sub-prio (installed repo handled above) */
  r = (sb->repo ? sb->repo->subpriority : 0) - (sa->repo ? sa->repo->subpriority : 0);
  if (r)
    return r;
  /* no idea about the order, sort by id */
  return a - b;
}


/*
* prune to repository with highest priority.
* does not prune installed solvables.
*/

static void
prune_to_highest_prio(Pool *pool, Queue *plist)
{
  int i, j;
  Solvable *s;
  int bestprio = 0, bestprioset = 0;

  /* prune to highest priority */
  for (i = 0; i < plist->count; i++) /* find highest prio in queue */
    {
      s = pool->solvables + plist->elements[i];
      if (pool->installed && s->repo == pool->installed)
continue;
      if (!bestprioset || s->repo->priority > bestprio)
{
bestprio = s->repo->priority;
bestprioset = 1;
}
    }
  if (!bestprioset)
    return;
  for (i = j = 0; i < plist->count; i++) /* remove all with lower prio */
    {
      s = pool->solvables + plist->elements[i];
      if (s->repo->priority == bestprio || (pool->installed && s->repo == pool->installed))
plist->elements[j++] = plist->elements[i];
    }
  plist->count = j;
}


/* installed packages involed in a dup operation can only be kept
* if they are identical to a non-installed one */
static void
solver_prune_installed_dup_packages(Solver *solv, Queue *plist)
{
  Pool *pool = solv->pool;
  int i, j, bestprio = 0;

  /* find bestprio (again) */
  for (i = 0; i < plist->count; i++)
    {
      Solvable *s = pool->solvables + plist->elements[i];
      if (s->repo != pool->installed)
{
bestprio = s->repo->priority;
break;
}
    }
  if (i == plist->count)
    return; /* only installed packages, could not find prio */
  for (i = j = 0; i < plist->count; i++)
    {
      Id p = plist->elements[i];
      Solvable *s = pool->solvables + p;
      if (s->repo != pool->installed && s->repo->priority < bestprio)
continue;
      if (s->repo == pool->installed && (solv->dupmap_all || (solv->dupinvolvedmap.size && MAPTST(&solv->dupinvolvedmap, p))))
{
Id p2, pp2;
int keepit = 0;
FOR_PROVIDES(p2, pp2, s->name)
{
Solvable *s2 = pool->solvables + p2;
if (s2->repo == pool->installed || s2->evr != s->evr || s2->repo->priority < bestprio)
continue;
if (!solvable_identical(s, s2))
continue;
keepit = 1;
if (s2->repo->priority > bestprio)
{
/* new max prio! */
bestprio = s2->repo->priority;
j = 0;
}
}
if (!keepit)
continue; /* no identical package found, ignore installed package */
}
      plist->elements[j++] = p;
    }
  if (j)
    plist->count = j;
}

/*
* like prune_to_highest_prio, but calls solver prune_installed_dup_packages
* when there are dup packages
*/
static inline void
solver_prune_to_highest_prio(Solver *solv, Queue *plist)
{
  prune_to_highest_prio(solv->pool, plist);
  if (plist->count > 1 && solv->pool->installed && (solv->dupmap_all || solv->dupinvolvedmap.size))
    solver_prune_installed_dup_packages(solv, plist);
}


static void
solver_prune_to_highest_prio_per_name(Solver *solv, Queue *plist)
{
  Pool *pool = solv->pool;
  Queue pq;
  int i, j, k;
  Id name;

  queue_init(&pq);
  solv_sort(plist->elements, plist->count, sizeof(Id), prune_to_best_version_sortcmp, pool);
  queue_push(&pq, plist->elements[0]);
  name = pool->solvables[pq.elements[0]].name;
  for (i = 1, j = 0; i < plist->count; i++)
    {
      if (pool->solvables[plist->elements[i]].name != name)
{
if (pq.count > 2)
solver_prune_to_highest_prio(solv, &pq);
for (k = 0; k < pq.count; k++)
plist->elements[j++] = pq.elements[k];
queue_empty(&pq);
queue_push(&pq, plist->elements[i]);
name = pool->solvables[pq.elements[0]].name;
}
    }
  if (pq.count > 2)
    solver_prune_to_highest_prio(solv, &pq);
  for (k = 0; k < pq.count; k++)
    plist->elements[j++] = pq.elements[k];
  queue_free(&pq);
  plist->count = j;
}


#ifdef ENABLE_COMPLEX_DEPS

static void
check_complex_dep(Solver *solv, Id dep, Map *m, Queue **cqp)
{
  Pool *pool = solv->pool;
  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)
    {
      queue_free(&q);
      return;
    }
  qcnt = q.count;
  for (i = 0; i < qcnt; i++)
    {
      for (; (p = q.elements[i]) != 0; i++)
{
if (p < 0)
{
if (solv->decisionmap[-p] > 0)
continue;
if (solv->decisionmap[-p] < 0)
break;
queue_push(&q, -p);
}
if (p > 0 && qcnt == q.count)
MAPSET(m, p);
}
      if (q.elements[i])
{
#if 0
printf("complex dep block cannot be true\n");
#endif
while (q.elements[i])
i++;
if (qcnt != q.count)
queue_truncate(&q, qcnt);
}
      else if (qcnt != q.count)
{
int j, k;
Queue *cq = *cqp;
#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
if (!cq)
{
cq = solv_calloc(1, sizeof(Queue));
queue_init(cq);
*cqp = cq;
queue_insertn(cq, 0, 256, 0);
}
for (j = qcnt; j < q.count; j++)
{
p = q.elements[j];
for (k = 256; k < cq->count; k += 2)
if (cq->elements[k + 1] == dep && cq->elements[k] == p)
break;
if (k == cq->count)
{
queue_push2(cq, p, dep);
cq->elements[p & 255] |= (1 << (p >> 8 & 31));
}
}
queue_truncate(&q, qcnt);
}
    }
  queue_free(&q);
}

static void
recheck_complex_dep(Solver *solv, Id p, Map *m, Queue **cqp)
{
  Queue *cq = *cqp;
  int i;
#if 0
printf("recheck_complex_dep for package %s\n", pool_solvid2str(solv->pool, p));
#endif
  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... */
  memset(cq->elements, 0, sizeof(Id) * 256);
  for (i = 256; i < cq->count; i += 2)
    if (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
      {
Id pp = cq->elements[i];
        cq->elements[pp & 255] |= (1 << (pp >> 8 & 31));
      }
}

#endif


void
policy_update_recommendsmap(Solver *solv)
{
  Pool *pool = solv->pool;
  Solvable *s;
  Id p, pp, rec, *recp, sug, *sugp;

  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)
    {
      p = solv->decisionq.elements[solv->recommends_index++];
      if (p < 0)
continue;
      s = pool->solvables + p;
#ifdef ENABLE_COMPLEX_DEPS
      if (solv->recommendscplxq && solv->recommendscplxq->elements[p & 255])
if (solv->recommendscplxq->elements[p & 255] & (1 << (p >> 8 & 31)))
recheck_complex_dep(solv, p, &solv->recommendsmap, &solv->recommendscplxq);
      if (solv->suggestscplxq && solv->suggestscplxq->elements[p & 255])
if (solv->suggestscplxq->elements[p & 255] & (1 << (p >> 8 & 31)))
recheck_complex_dep(solv, p, &solv->suggestsmap, &solv->suggestscplxq);
#endif
      if (s->recommends)
{
recp = s->repo->idarraydata + s->recommends;
          while ((rec = *recp++) != 0)
{
#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)
{
#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);
}
}
    }
}

/*
* 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;
  for (i = j = 0; i < plist->count; i++)
    {
      p = plist->elements[i];
      s = pool->solvables + p;
      if (pool->installed && s->repo == pool->installed)
{
ninst++;
if (j)
plist->elements[j++] = p;
continue;
}
      if (!MAPTST(&solv->recommendsmap, p))
if (!solver_is_supplementing(solv, s))
continue;
      if (!j && ninst)
{
for (k = 0; j < ninst; k++)
{
s = pool->solvables + plist->elements[k];
if (pool->installed && s->repo == pool->installed)
plist->elements[j++] = plist->elements[k];
}
}
      plist->elements[j++] = p;
    }
  if (j)
    plist->count = j;

  /* anything left to prune? */
  if (plist->count - ninst < 2)
    return;

  /* prune to suggested/enhanced */
  ninst = 0;
  for (i = j = 0; i < plist->count; i++)
    {
      p = plist->elements[i];
      s = pool->solvables + p;
      if (pool->installed && s->repo == pool->installed)
{
ninst++;
if (j)
plist->elements[j++] = p;
continue;
}
      if (!MAPTST(&solv->suggestsmap, p))
        if (!solver_is_enhancing(solv, s))
continue;
      if (!j && ninst)
{
for (k = 0; j < ninst; k++)
{
s = pool->solvables + plist->elements[k];
if (pool->installed && s->repo == pool->installed)
plist->elements[j++] = plist->elements[k];
}
}
      plist->elements[j++] = p;
    }
  if (j)
    plist->count = j;
}

static void
prune_to_best_arch(const Pool *pool, Queue *plist)
{
  Id a, bestscore;
  Solvable *s;
  int i, j;

  if (!pool->id2arch || plist->count < 2)
    return;
  bestscore = 0;
  for (i = 0; i < plist->count; i++)
    {
      s = pool->solvables + plist->elements[i];
      a = s->arch;
      a = (a <= pool->lastarch) ? pool->id2arch[a] : 0;
      if (a && a != 1 && (!bestscore || a < bestscore))
bestscore = a;
    }
  if (!bestscore)
    return;
  for (i = j = 0; i < plist->count; i++)
    {
      s = pool->solvables + plist->elements[i];
      a = s->arch;
      if (a > pool->lastarch)
continue;
      a = pool->id2arch[a];
      /* a == 1 -> noarch */
      if (a != 1 && ((a ^ bestscore) & 0xffff0000) != 0)
continue;
      plist->elements[j++] = plist->elements[i];
    }
  if (j)
    plist->count = j;
}


struct trj_data {
  Pool *pool;
  Queue *plist;
  Id *stack;
  Id nstack;
  Id *low;
  Id firstidx;
  Id idx;
};

/* This is Tarjan's SCC algorithm, slightly modified */
static void
trj_visit(struct trj_data *trj, Id node)
{
  Id *low = trj->low;
  Pool *pool = trj->pool;
  Queue *plist = trj->plist;
  Id myidx, stackstart;
  Solvable *s;
  int i;
  Id p, pp, obs, *obsp;

  low[node] = myidx = trj->idx++;
  trj->stack[(stackstart = trj->nstack++)] = node;

  s = pool->solvables + plist->elements[node];
  if (s->obsoletes)
    {
      obsp = s->repo->idarraydata + s->obsoletes;
      while ((obs = *obsp++) != 0)
{
FOR_PROVIDES(p, pp, obs)
{
Solvable *ps = pool->solvables + p;
if (ps->name == s->name)
continue;
if (!pool->obsoleteusesprovides && !pool_match_nevr(pool, ps, obs))
continue;
if (pool->obsoleteusescolors && !pool_colormatch(pool, s, ps))
continue;
/* hmm, expensive. should use hash if plist is big */
for (i = 0; i < plist->count; i++)
{
if (node != i && plist->elements[i] == p)
{
Id l = low[i];
if (!l)
{
if (!ps->obsoletes)
{
/* don't bother */
trj->idx++;
low[i] = -1;
continue;
}
trj_visit(trj, i);
l = low[i];
}
if (l < 0)
continue;
if (l < trj->firstidx)
{
int k;
/* this means we have reached an old SCC found earlier.
* delete it as we obsolete it */
for (k = l; ; k++)
{
if (low[trj->stack[k]] == l)
low[trj->stack[k]] = -1;
else
break;
}
}
else if (l < low[node])
low[node] = l;
}
}
}
}
    }
  if (low[node] == myidx) /* found a SCC? */
    {
      /* we're only interested in SCCs that contain the first node,
* as all others are "obsoleted" */
      if (myidx != trj->firstidx)
myidx = -1;
      for (i = stackstart; i < trj->nstack; i++)
low[trj->stack[i]] = myidx;
      trj->nstack = stackstart; /* empty stack */
    }
}

/*
* remove entries from plist that are obsoleted by other entries
* with different name.
*/
static void
prune_obsoleted(Pool *pool, Queue *plist)
{
  Id data_buf[2 * 16], *data;
  struct trj_data trj;
  int i, j;
  Solvable *s;

  if (plist->count <= 16)
    {
      memset(data_buf, 0, sizeof(data_buf));
      data = data_buf;
    }
  else
    data = solv_calloc(plist->count, 2 * sizeof(Id));
  trj.pool = pool;
  trj.plist = plist;
  trj.low = data;
  trj.idx = 1;
  trj.stack = data + plist->count - 1; /* -1 so we can index with idx (which starts with 1) */
  for (i = 0; i < plist->count; i++)
    {
      if (trj.low[i])
continue;
      s = pool->solvables + plist->elements[i];
      if (s->obsoletes)
{
trj.firstidx = trj.nstack = trj.idx;
          trj_visit(&trj, i);
}
      else
        {
          Id myidx = trj.idx++;
          trj.low[i] = myidx;
          trj.stack[myidx] = i;
        }
    }
  for (i = j = 0; i < plist->count; i++)
    if (trj.low[i] >= 0)
      plist->elements[j++] = plist->elements[i];
  plist->count = j;
  if (data != data_buf)
    solv_free(data);
}

/* this is prune_obsoleted special-cased for two elements */
static void
prune_obsoleted_2(Pool *pool, Queue *plist)
{
  int i;
  Solvable *s;
  Id p, pp, obs, *obsp;
  Id other;
  int obmap = 0;

  for (i = 0; i < 2; i++)
    {
      s = pool->solvables + plist->elements[i];
      other = plist->elements[1 - i];
      if (s->obsoletes)
{
obsp = s->repo->idarraydata + s->obsoletes;
while ((obs = *obsp++) != 0)
{
FOR_PROVIDES(p, pp, obs)
{
Solvable *ps;
if (p != other)
continue;
ps = pool->solvables + p;
if (ps->name == s->name)
continue;
if (!pool->obsoleteusesprovides && !pool_match_nevr(pool, ps, obs))
continue;
if (pool->obsoleteusescolors && !pool_colormatch(pool, s, ps))
continue;
obmap |= 1 << i;
break;
}
if (p)
break;
}
}
    }
  if (obmap == 0 || obmap == 3)
    return;
  if (obmap == 2)
    plist->elements[0] = plist->elements[1];
  plist->count = 1;
}

/*
* bring those elements to the front of the queue that
* have a installed solvable with the same name
*/
static void
move_installed_to_front(Pool *pool, Queue *plist)
{
  int i, j;
  Solvable *s;
  Id p, pp;

  for (i = j = 0; i < plist->count; i++)
    {
      s = pool->solvables + plist->elements[i];
      if (s->repo != pool->installed)
        {
          FOR_PROVIDES(p, pp, s->name)
{
Solvable *ps = pool->solvables + p;
if (s->name == ps->name && ps->repo == pool->installed)
{
s = ps;
break;
}
}
        }
      if (s->repo == pool->installed)
{
if (i != j)
{
p = plist->elements[i];
              if (i - j == 1)
plist->elements[i] = plist->elements[j];
else
memmove(plist->elements + j + 1, plist->elements + j, (i - j) * sizeof(Id));
plist->elements[j] = p;
}
else if (j + 2 == plist->count)
break; /* no need to check last element if all prev ones are installed */
j++;
}
    }
}

/*
* prune_to_best_version
*
* sort list of packages (given through plist) by name and evr
* return result through plist
*/
static void
prune_to_best_version(Pool *pool, Queue *plist)
{
  int i, j;
  Solvable *s, *best;

  if (plist->count < 2) /* no need to prune for a single entry */
    return;
  POOL_DEBUG(SOLV_DEBUG_POLICY, "prune_to_best_version %d\n", plist->count);

  /* sort by name first, prefer installed */
  solv_sort(plist->elements, plist->count, sizeof(Id), prune_to_best_version_sortcmp, pool);

  /* now find best 'per name' */
  best = 0;
  for (i = j = 0; i < plist->count; i++)
    {
      s = pool->solvables + plist->elements[i];

      POOL_DEBUG(SOLV_DEBUG_POLICY, "- %s[%s]\n",
pool_solvable2str(pool, s),
(pool->installed && s->repo == pool->installed) ? "installed" : "not installed");

      if (!best) /* if no best yet, the current is best */
        {
          best = s;
          continue;
        }

      /* name switch: finish group, re-init */
      if (best->name != s->name) /* new name */
        {
          plist->elements[j++] = best - pool->solvables; /* move old best to front */
          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;
        }
    }
  plist->elements[j++] = best - pool->solvables; /* finish last group */
  plist->count = j;

  /* we reduced the list to one package per name, now look at
* package obsoletes */
  if (plist->count > 1)
    {
      if (plist->count == 2)
        prune_obsoleted_2(pool, plist);
      else
        prune_obsoleted(pool, plist);
    }
  if (plist->count > 1 && pool->installed)
    move_installed_to_front(pool, plist);
}


/*
* POLICY_MODE_CHOOSE: default, do all pruning steps
* POLICY_MODE_RECOMMEND: leave out prune_to_recommended
* POLICY_MODE_SUGGEST: leave out prune_to_recommended, do prio pruning just per name
*/
void
policy_filter_unwanted(Solver *solv, Queue *plist, int mode)
{
  Pool *pool = solv->pool;
  if (plist->count > 1)
    {
      if (mode != POLICY_MODE_SUGGEST)
        solver_prune_to_highest_prio(solv, plist);
      else
        solver_prune_to_highest_prio_per_name(solv, plist);
    }
  if (plist->count > 1)
    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);
}


/* check if there is an illegal architecture change if
* installed solvable s1 is replaced by s2 */
int
policy_illegal_archchange(Solver *solv, Solvable *s1, Solvable *s2)
{
  Pool *pool = solv->pool;
  Id a1 = s1->arch, a2 = s2->arch;

  /* we allow changes to/from noarch */
  if (a1 == a2 || a1 == pool->noarchid || a2 == pool->noarchid)
    return 0;
  if (!pool->id2arch)
    return 0;
  a1 = a1 <= pool->lastarch ? pool->id2arch[a1] : 0;
  a2 = a2 <= pool->lastarch ? pool->id2arch[a2] : 0;
  if (((a1 ^ a2) & 0xffff0000) != 0)
    return 1;
  return 0;
}

/* check if there is an illegal vendor change if
* installed solvable s1 is replaced by s2 */
int
policy_illegal_vendorchange(Solver *solv, Solvable *s1, Solvable *s2)
{
  Pool *pool = solv->pool;
  Id v1, v2;
  Id vendormask1, vendormask2;

  if (pool->custom_vendorcheck)
     return pool->custom_vendorcheck(pool, s1, s2);

  /* treat a missing vendor as empty string */
  v1 = s1->vendor ? s1->vendor : ID_EMPTY;
  v2 = s2->vendor ? s2->vendor : ID_EMPTY;
  if (v1 == v2)
    return 0;
  vendormask1 = pool_vendor2mask(pool, v1);
  if (!vendormask1)
    return 1; /* can't match */
  vendormask2 = pool_vendor2mask(pool, v2);
  if ((vendormask1 & vendormask2) != 0)
    return 0;
  return 1; /* no class matches */
}

/* check if it is illegal to replace installed
* package "is" with package "s" (which must obsolete "is")
*/
int
policy_is_illegal(Solver *solv, Solvable *is, Solvable *s, int ignore)
{
  Pool *pool = solv->pool;
  int ret = 0;
  int duppkg = solv->dupmap_all ? 1 : 0;
  if (!(ignore & POLICY_ILLEGAL_DOWNGRADE) && !(duppkg ? solv->dup_allowdowngrade : solv->allowdowngrade))
    {
      if (is->name == s->name && pool_evrcmp(pool, is->evr, s->evr, EVRCMP_COMPARE) > 0)
ret |= POLICY_ILLEGAL_DOWNGRADE;
    }
  if (!(ignore & POLICY_ILLEGAL_ARCHCHANGE) && !(duppkg ? solv->dup_allowarchchange : solv->allowarchchange))
    {
      if (is->arch != s->arch && policy_illegal_archchange(solv, is, s))
ret |= POLICY_ILLEGAL_ARCHCHANGE;
    }
  if (!(ignore & POLICY_ILLEGAL_VENDORCHANGE) && !(duppkg ? solv->dup_allowvendorchange : solv->allowvendorchange))
    {
      if (is->vendor != s->vendor && policy_illegal_vendorchange(solv, is, s))
ret |= POLICY_ILLEGAL_VENDORCHANGE;
    }
  if (!(ignore & POLICY_ILLEGAL_NAMECHANGE) && !(duppkg ? solv->dup_allownamechange : solv->allownamechange))
    {
      if (is->name != s->name)
ret |= POLICY_ILLEGAL_NAMECHANGE;
    }
  return ret;
}

/*-------------------------------------------------------------------
*
* create reverse obsoletes map for installed solvables
*
* For each installed solvable find which packages with *different* names
* obsolete the solvable.
* This index is used in policy_findupdatepackages() below.
*/
void
policy_create_obsolete_index(Solver *solv)
{
  Pool *pool = solv->pool;
  Solvable *s;
  Repo *installed = solv->installed;
  Id p, pp, obs, *obsp, *obsoletes, *obsoletes_data;
  int i, n, cnt;

  solv->obsoletes = solv_free(solv->obsoletes);
  solv->obsoletes_data = solv_free(solv->obsoletes_data);
  if (!installed || installed->start == installed->end)
    return;
  cnt = installed->end - installed->start;
  solv->obsoletes = obsoletes = solv_calloc(cnt, sizeof(Id));
  for (i = 1; i < pool->nsolvables; i++)
    {
      s = pool->solvables + i;
      if (!s->obsoletes)
continue;
      if (!pool_installable(pool, s))
continue;
      obsp = s->repo->idarraydata + s->obsoletes;
      while ((obs = *obsp++) != 0)
{
FOR_PROVIDES(p, pp, obs)
{
Solvable *ps = pool->solvables + p;;
if (ps->repo != installed)
continue;
if (ps->name == s->name)
continue;
if (!pool->obsoleteusesprovides && !pool_match_nevr(pool, ps, obs))
continue;
if (pool->obsoleteusescolors && !pool_colormatch(pool, s, ps))
continue;
obsoletes[p - installed->start]++;
}
}
    }
  n = 0;
  for (i = 0; i < cnt; i++)
    if (obsoletes[i])
      {
        n += obsoletes[i] + 1;
        obsoletes[i] = n;
      }
  solv->obsoletes_data = obsoletes_data = solv_calloc(n + 1, sizeof(Id));
  POOL_DEBUG(SOLV_DEBUG_STATS, "obsoletes data: %d entries\n", n + 1);
  for (i = pool->nsolvables - 1; i > 0; i--)
    {
      s = pool->solvables + i;
      if (!s->obsoletes)
continue;
      if (!pool_installable(pool, s))
continue;
      obsp = s->repo->idarraydata + s->obsoletes;
      while ((obs = *obsp++) != 0)
{
FOR_PROVIDES(p, pp, obs)
{
Solvable *ps = pool->solvables + p;;
if (ps->repo != installed)
continue;
if (ps->name == s->name)
continue;
if (!pool->obsoleteusesprovides && !pool_match_nevr(pool, ps, obs))
continue;
if (pool->obsoleteusescolors && !pool_colormatch(pool, s, ps))
continue;
if (obsoletes_data[obsoletes[p - installed->start]] != i)
obsoletes_data[--obsoletes[p - installed->start]] = i;
}
}
    }
}


/*
* find update candidates
*
* s: installed solvable to be updated
* qs: [out] queue to hold Ids of candidates
* allow_all: 0 = dont allow downgrades, 1 = allow all candidates
* 2 = dup mode
*
*/
void
policy_findupdatepackages(Solver *solv, Solvable *s, Queue *qs, int allow_all)
{
  /* installed packages get a special upgrade allowed rule */
  Pool *pool = solv->pool;
  Id p, pp, n, p2, pp2;
  Id obs, *obsp;
  Solvable *ps;
  int haveprovobs = 0;
  int allowdowngrade = allow_all ? 1 : solv->allowdowngrade;
  int allownamechange = allow_all ? 1 : solv->allownamechange;
  int allowarchchange = allow_all ? 1 : solv->allowarchchange;
  int allowvendorchange = allow_all ? 1 : solv->allowvendorchange;
  if (allow_all == 2)
    {
      allowdowngrade = solv->dup_allowdowngrade;
      allownamechange = solv->dup_allownamechange;
      allowarchchange = solv->dup_allowarchchange;
      allowvendorchange = solv->dup_allowvendorchange;
    }

  queue_empty(qs);

  n = s - pool->solvables;

  /*
* look for updates for s
*/
  FOR_PROVIDES(p, pp, s->name) /* every provider of s' name */
    {
      if (p == n) /* skip itself */
continue;

      ps = pool->solvables + p;
      if (s->name == ps->name) /* name match */
{
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 ? */
{
/* 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 */
{
FOR_PROVIDES(p2, pp2, obs) /* and all matching providers of the obsoletes */
{
Solvable *ps2 = pool->solvables + p2;
if (!pool->obsoleteusesprovides && !pool_match_nevr(pool, ps2, obs))
continue;
if (p2 == n) /* match ! */
break;
}
if (p2) /* match! */
break;
}
if (!obs) /* continue if no match */
continue;
/* here we have 'p' with a matching provides/obsoletes combination
* thus flagging p as a valid update candidate for s
*/
haveprovobs = 1;
}
      else
        continue;
      if (!allowarchchange && s->arch != ps->arch && policy_illegal_archchange(solv, s, ps))
continue;
      if (!allowvendorchange && s->vendor != ps->vendor && policy_illegal_vendorchange(solv, s, ps))
continue;
      queue_push(qs, p);
    }
  if (!allownamechange)
    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)
    return;
  if (solv->obsoletes && solv->obsoletes[n - solv->installed->start])
    {
      Id *opp;
      for (opp = solv->obsoletes_data + solv->obsoletes[n - solv->installed->start]; (p = *opp++) != 0;)
{
ps = pool->solvables + p;
if (!allowarchchange && s->arch != ps->arch && policy_illegal_archchange(solv, s, ps))
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);
}
    }
}

const char *
policy_illegal2str(Solver *solv, int illegal, Solvable *s, Solvable *rs)
{
  Pool *pool = solv->pool;
  const char *str;
  if (illegal == POLICY_ILLEGAL_DOWNGRADE)
    {
      str = pool_tmpjoin(pool, "downgrade of ", pool_solvable2str(pool, s), 0);
      return pool_tmpappend(pool, str, " to ", pool_solvable2str(pool, rs));
    }
  if (illegal == POLICY_ILLEGAL_NAMECHANGE)
    {
      str = pool_tmpjoin(pool, "name change of ", pool_solvable2str(pool, s), 0);
      return pool_tmpappend(pool, str, " to ", pool_solvable2str(pool, rs));
    }
  if (illegal == POLICY_ILLEGAL_ARCHCHANGE)
    {
      str = pool_tmpjoin(pool, "architecture change of ", pool_solvable2str(pool, s), 0);
      return pool_tmpappend(pool, str, " to ", pool_solvable2str(pool, rs));
    }
  if (illegal == POLICY_ILLEGAL_VENDORCHANGE)
    {
      str = pool_tmpjoin(pool, "vendor change from '", pool_id2str(pool, s->vendor), "' (");
      if (rs->vendor)
{
          str = pool_tmpappend(pool, str, pool_solvable2str(pool, s), ") to '");
          str = pool_tmpappend(pool, str, pool_id2str(pool, rs->vendor), "' (");
}
      else
        str = pool_tmpappend(pool, str, pool_solvable2str(pool, s), ") to no vendor (");
      return pool_tmpappend(pool, str, pool_solvable2str(pool, rs), ")");
    }
  return "unknown illegal change";
}
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