rules.c

/*
 * Copyright (c) 2007-2017, SUSE Inc.
 *
 * This program is licensed under the BSD license, read LICENSE.BSD
 * for further information
 */

/*
 * rules.c
 *
 * SAT based dependency solver
 */

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

#include "solver.h"
#include "solver_private.h"
#include "bitmap.h"
#include "pool.h"
#include "poolarch.h"
#include "util.h"
#include "evr.h"
#include "policy.h"
#include "solverdebug.h"
#include "linkedpkg.h"
#include "cplxdeps.h"

#define RULES_BLOCK 63

static void addpkgruleinfo(Solver *solv, Id p, Id p2, Id d, int type, Id dep);

static inline int
is_otherproviders_dep(Pool *pool, Id dep)
{
  if (ISRELDEP(dep))
    {
      Reldep *rd = GETRELDEP(pool, dep);
      if (rd->flags == REL_NAMESPACE && rd->name == NAMESPACE_OTHERPROVIDERS)
	return 1;
    }
  return 0;
}

/********************************************************************
 *
 * Rule handling
 *
 * - unify rules, remove duplicates
 */

/*-------------------------------------------------------------------
 *
 * compare rules for unification sort
 *
 */

static int
unifyrules_sortcmp(const void *ap, const void *bp, void *dp)
{
  Pool *pool = dp;
  Rule *a = (Rule *)ap;
  Rule *b = (Rule *)bp;
  Id *ad, *bd;
  int x;

  x = a->p - b->p;
  if (x)
    return x;				/* p differs */

  /* identical p */
  if (a->d == 0 && b->d == 0)		/* both assertions or binary */
    return a->w2 - b->w2;

  if (a->d == 0)			/* a is assertion or binary, b not */
    {
      x = a->w2 - pool->whatprovidesdata[b->d];
      return x ? x : -1;
    }

  if (b->d == 0)			/* b is assertion or binary, a not */
    {
      x = pool->whatprovidesdata[a->d] - b->w2;
      return x ? x : 1;
    }

  if (a->d == b->d)
    return 0;

  /* compare whatprovidesdata */
  ad = pool->whatprovidesdata + a->d;
  bd = pool->whatprovidesdata + b->d;
  while (*bd)
    if ((x = *ad++ - *bd++) != 0)
      return x;
  return *ad;
}

int
solver_rulecmp(Solver *solv, Rule *r1, Rule *r2)
{
  return unifyrules_sortcmp(r1, r2, solv->pool);
}


/*-------------------------------------------------------------------
 *
 * unify rules
 * go over all rules and remove duplicates
 */

void
solver_unifyrules(Solver *solv)
{
  Pool *pool = solv->pool;
  int i, j;
  Rule *ir, *jr;

  if (solv->nrules <= 2)		/* nothing to unify */
    return;

  if (solv->recommendsruleq)
    {
      /* mis-use n2 as recommends rule marker */
      for (i = 1, ir = solv->rules + i; i < solv->nrules; i++, ir++)
	ir->n2 = 0;
      for (i = 0; i < solv->recommendsruleq->count; i++)
	solv->rules[solv->recommendsruleq->elements[i]].n2 = 1;
    }

  /* sort rules first */
  solv_sort(solv->rules + 1, solv->nrules - 1, sizeof(Rule), unifyrules_sortcmp, solv->pool);

  /* prune rules */
  jr = 0;
  for (i = j = 1, ir = solv->rules + i; i < solv->nrules; i++, ir++)
    {
      if (jr && !unifyrules_sortcmp(ir, jr, pool))
	{
	  jr->n2 &= ir->n2;		/* bitwise-and recommends marker */
	  continue;			/* prune! */
	}
      jr = solv->rules + j++;		/* keep! */
      if (ir != jr)
        *jr = *ir;
    }

  /* reduced count from nrules to j rules */
  POOL_DEBUG(SOLV_DEBUG_STATS, "pruned rules from %d to %d\n", solv->nrules, j);

  /* adapt rule buffer */
  solver_shrinkrules(solv, j);

  if (solv->recommendsruleq)
    {
      /* rebuild recommendsruleq */
      queue_empty(solv->recommendsruleq);
      for (i = 1, ir = solv->rules + i; i < solv->nrules; i++, ir++)
	if (ir->n2)
	  {
	    ir->n2 = 0;
	    queue_push(solv->recommendsruleq, i);
	  }
    }

  /*
   * debug: log rule statistics
   */
  IF_POOLDEBUG (SOLV_DEBUG_STATS)
    {
      int binr = 0;
      int lits = 0;
      Id *dp;
      Rule *r;

      for (i = 1; i < solv->nrules; i++)
	{
	  r = solv->rules + i;
	  if (r->d == 0)
	    binr++;
	  else
	    {
	      dp = pool->whatprovidesdata + r->d;
	      while (*dp++)
		lits++;
	    }
	}
      POOL_DEBUG(SOLV_DEBUG_STATS, "  binary: %d\n", binr);
      POOL_DEBUG(SOLV_DEBUG_STATS, "  normal: %d, %d literals\n", solv->nrules - 1 - binr, lits);
    }
}

#if 0

/*
 * hash rule
 */

static Hashval
hashrule(Solver *solv, Id p, Id d, int n)
{
  unsigned int x = (unsigned int)p;
  int *dp;

  if (n <= 1)
    return (x * 37) ^ (unsigned int)d;
  dp = solv->pool->whatprovidesdata + d;
  while (*dp)
    x = (x * 37) ^ (unsigned int)*dp++;
  return x;
}
#endif


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

/*
 * add rule
 *
 * A requires b, b provided by B1,B2,B3 => (-A|B1|B2|B3)
 *
 * p < 0  : pkg id of A
 * d > 0  : Offset in whatprovidesdata (list of providers of b)
 *
 * A conflicts b, b provided by B1,B2,B3 => (-A|-B1), (-A|-B2), (-A|-B3)
 * p < 0  : pkg id of A
 * p2 < 0 : Id of solvable (e.g. B1)
 *
 * d == 0, p2 == 0: unary rule, assertion => (A) or (-A)
 *
 *   Install:    p > 0, d = 0   (A)             user requested install
 *   Remove:     p < 0, d = 0   (-A)            user requested remove (also: uninstallable)
 *   Requires:   p < 0, d > 0   (-A|B1|B2|...)  d: <list of providers for requirement of p>
 *   Updates:    p > 0, d > 0   (A|B1|B2|...)   d: <list of updates for solvable p>
 *   Conflicts:  p < 0, p2 < 0  (-A|-B)         either p (conflict issuer) or d (conflict provider) (binary rule)
 *                                              also used for obsoletes
 *   No-op ?:    p = 0, d = 0   (null)          (used as placeholder in update/feature rules)
 *
 *   resulting watches:
 *   ------------------
 *   Direct assertion (no watch needed) --> d = 0, w1 = p, w2 = 0
 *   Binary rule: p = first literal, d = 0, w2 = second literal, w1 = p
 *   every other : w1 = p, w2 = whatprovidesdata[d];
 *
 *   always returns a rule for non-pkg rules
 */

Rule *
solver_addrule(Solver *solv, Id p, Id p2, Id d)
{
  Pool *pool = solv->pool;
  Rule *r;

  if (d)
    {
      assert(!p2 && d > 0);
      if (!pool->whatprovidesdata[d])
	d = 0;
      else if (!pool->whatprovidesdata[d + 1])
	{
	  p2 = pool->whatprovidesdata[d];
	  d = 0;
	}
    }

  /* now we have two cases:
   * 1 or 2 literals:    d = 0, p, p2 contain the literals
   * 3 or more literals: d > 0, p2 == 0, d is offset into whatprovidesdata
   */

  /* it often happenes that requires lead to adding the same pkg rule
   * multiple times, so we prune those duplicates right away to make
   * the work for unifyrules a bit easier */
  if (!solv->pkgrules_end)		/* we add pkg rules */
    {
      r = solv->rules + solv->lastpkgrule;
      if (d)
	{
	  Id *dp;
	  /* check if rule is identical */
	  if (r->p == p)
	    {
	      Id *dp2;
	      if (r->d == d)
		return r;
	      dp2 = pool->whatprovidesdata + r->d;
	      for (dp = pool->whatprovidesdata + d; *dp; dp++, dp2++)
		if (*dp != *dp2)
		  break;
	      if (*dp == *dp2)
		return r;
	    }
	  /* check if rule is self-fulfilling */
	  for (dp = pool->whatprovidesdata + d; *dp; dp++)
	    if (*dp == -p)
	      return 0;			/* rule is self-fulfilling */
	}
      else
	{
	  if (p2 && p > p2)
	    {
	      Id o = p;			/* switch p1 and p2 */
	      p = p2;
	      p2 = o;
	    }
	  if (r->p == p && !r->d && r->w2 == p2)
	    return r;
	  if (p == -p2)
	    return 0;			/* rule is self-fulfilling */
	}
      solv->lastpkgrule = solv->nrules;
    }

  solv->rules = solv_extend(solv->rules, solv->nrules, 1, sizeof(Rule), RULES_BLOCK);
  r = solv->rules + solv->nrules++;    /* point to rule space */
  r->p = p;
  r->d = d;
  r->w1 = p;
  r->w2 = d ? pool->whatprovidesdata[d] : p2;
  r->n1 = 0;
  r->n2 = 0;
  IF_POOLDEBUG (SOLV_DEBUG_RULE_CREATION)
    {
      POOL_DEBUG(SOLV_DEBUG_RULE_CREATION, "  Add rule: ");
      solver_printrule(solv, SOLV_DEBUG_RULE_CREATION, r);
    }
  return r;
}


void
solver_shrinkrules(Solver *solv, int nrules)
{
  solv->nrules = nrules;
  solv->rules = solv_extend_resize(solv->rules, solv->nrules, sizeof(Rule), RULES_BLOCK);
  solv->lastpkgrule = 0;
}

/******************************************************************************
 ***
 *** pkg rule part: create rules representing the package dependencies
 ***
 ***/

/*
 *  special multiversion patch conflict handling:
 *  a patch conflict is also satisfied if some other
 *  version with the same name/arch that doesn't conflict
 *  gets installed. The generated rule is thus:
 *  -patch|-cpack|opack1|opack2|...
 */
static Id
makemultiversionconflict(Solver *solv, Id n, Id con)
{
  Pool *pool = solv->pool;
  Solvable *s, *sn;
  Queue q;
  Id p, pp, qbuf[64];

  sn = pool->solvables + n;
  queue_init_buffer(&q, qbuf, sizeof(qbuf)/sizeof(*qbuf));
  queue_push(&q, -n);
  FOR_PROVIDES(p, pp, sn->name)
    {
      s = pool->solvables + p;
      if (s->name != sn->name || s->arch != sn->arch)
	continue;
      if (!MAPTST(&solv->multiversion, p))
	continue;
      if (pool_match_nevr(pool, pool->solvables + p, con))
	continue;
      /* here we have a multiversion solvable that doesn't conflict */
      /* thus we're not in conflict if it is installed */
      queue_push(&q, p);
    }
  if (q.count == 1)
    n = 0;	/* no other package found, normal conflict handling */
  else
    n = pool_queuetowhatprovides(pool, &q);
  queue_free(&q);
  return n;
}

static inline void
addpkgrule(Solver *solv, Id p, Id p2, Id d, int type, Id dep)
{
  if (!solv->ruleinfoq)
    solver_addrule(solv, p, p2, d);
  else
    addpkgruleinfo(solv, p, p2, d, type, dep);
}

#ifdef ENABLE_LINKED_PKGS

static int
addlinks_cmp(const void *ap, const void *bp, void *dp)
{
  Pool *pool = dp;
  Id a = *(Id *)ap;
  Id b = *(Id *)bp;
  Solvable *sa = pool->solvables + a;
  Solvable *sb = pool->solvables + b;
  if (sa->name != sb->name)
    return sa->name - sb->name;
  return sa - sb;
}

static void
addlinks(Solver *solv, Solvable *s, Id req, Queue *qr, Id prv, Queue *qp, Map *m, Queue *workq)
{
  Pool *pool = solv->pool;
  int i;
  if (!qr->count)
    return;
  if (qp->count > 1)
    solv_sort(qp->elements, qp->count, sizeof(Id), addlinks_cmp, pool);
#if 0
  printf("ADDLINKS %s\n -> %s\n", pool_solvable2str(pool, s), pool_dep2str(pool, req));
  for (i = 0; i < qr->count; i++)
    printf("    - %s\n", pool_solvid2str(pool, qr->elements[i]));
  printf(" <- %s\n", pool_dep2str(pool, prv));
  for (i = 0; i < qp->count; i++)
    printf("    - %s\n", pool_solvid2str(pool, qp->elements[i]));
#endif

  if (qr->count == 1)
    addpkgrule(solv, -(s - pool->solvables), qr->elements[0], 0, SOLVER_RULE_PKG_REQUIRES, req);
  else
    addpkgrule(solv, -(s - pool->solvables), 0, pool_queuetowhatprovides(pool, qr), SOLVER_RULE_PKG_REQUIRES, req);
  if (qp->count > 1)
    {
      int j;
      for (i = j = 0; i < qp->count; i = j)
	{
	  Id d = pool->solvables[qp->elements[i]].name;
	  for (j = i + 1; j < qp->count; j++)
	    if (d != pool->solvables[qp->elements[j]].name)
	      break;
	  d = pool_ids2whatprovides(pool, qp->elements + i, j - i);
	  for (i = 0; i < qr->count; i++)
	    addpkgrule(solv, -qr->elements[i], 0, d, SOLVER_RULE_PKG_REQUIRES, prv);
	}
    }
  else if (qp->count)
    {
      for (i = 0; i < qr->count; i++)
	addpkgrule(solv, -qr->elements[i], qp->elements[0], 0, SOLVER_RULE_PKG_REQUIRES, prv);
    }
  if (!m)
    return;	/* nothing more to do if called from getpkgruleinfos() */
  for (i = 0; i < qr->count; i++)
    if (!MAPTST(m, qr->elements[i]))
      queue_push(workq, qr->elements[i]);
  for (i = 0; i < qp->count; i++)
    if (!MAPTST(m, qp->elements[i]))
      queue_push(workq, qp->elements[i]);
  if (solv->installed && s->repo == solv->installed)
    {
      Repo *installed = solv->installed;
      /* record installed buddies */
      if (!solv->instbuddy)
        solv->instbuddy = solv_calloc(installed->end - installed->start, sizeof(Id));
      if (qr->count == 1)
        solv->instbuddy[s - pool->solvables - installed->start] = qr->elements[0];
      for (i = 0; i < qr->count; i++)
	{
	  Id p = qr->elements[i];
	  if (pool->solvables[p].repo != installed)
	    continue;	/* huh? */
	  if (qp->count > 1 || (solv->instbuddy[p - installed->start] != 0 && solv->instbuddy[p - installed->start] != s - pool->solvables))
	    solv->instbuddy[p - installed->start] = 1;	/* 1: ambiguous buddy */
	  else
	    solv->instbuddy[p - installed->start] = s - pool->solvables;
	}
    }
}

static void
add_package_link(Solver *solv, Solvable *s, Map *m, Queue *workq)
{
  Queue qr, qp;
  Id req = 0, prv = 0;
  queue_init(&qr);
  queue_init(&qp);
  find_package_link(solv->pool, s, &req, &qr, &prv, &qp);
  if (qr.count)
    addlinks(solv, s, req, &qr, prv, &qp, m, workq);
  queue_free(&qr);
  queue_free(&qp);
}

#endif

#ifdef ENABLE_COMPLEX_DEPS

#ifdef SUSE
static inline int
suse_isptf(Pool *pool, Solvable *s)
{
  if (!strncmp("ptf-", pool_id2str(pool, s->name), 4))
    return 1;
  return 0;
}
#endif

static void
add_complex_deprules(Solver *solv, Id p, Id dep, int type, int dontfix, Queue *workq, Map *m)
{
  Pool *pool = solv->pool;
  Repo *installed = solv->installed;
  int i, j, flags;
  Queue bq;

  queue_init(&bq);
  flags = dontfix ? CPLXDEPS_DONTFIX : 0;
  /* CNF expansion for requires, DNF + INVERT expansion for conflicts */
  if (type == SOLVER_RULE_PKG_CONFLICTS)
    flags |= CPLXDEPS_TODNF | CPLXDEPS_EXPAND | CPLXDEPS_INVERT;
#ifdef SUSE
  if (type == SOLVER_RULE_PKG_REQUIRES && suse_isptf(pool, pool->solvables + p))
    flags |= CPLXDEPS_NAME;	/* do not match provides */
#endif

  i = pool_normalize_complex_dep(pool, dep, &bq, flags);
  /* handle special cases */
  if (i == 0)
    {
      if (dontfix)
	{
	  POOL_DEBUG(SOLV_DEBUG_RULE_CREATION, "ignoring broken dependency %s of installed package %s\n", pool_dep2str(pool, dep), pool_solvid2str(pool, p));
	}
      else
	{
	  POOL_DEBUG(SOLV_DEBUG_RULE_CREATION, "package %s [%d] is not installable (%s)\n", pool_solvid2str(pool, p), p, pool_dep2str(pool, dep));
	  addpkgrule(solv, -p, 0, 0, type == SOLVER_RULE_PKG_REQUIRES ? SOLVER_RULE_PKG_NOTHING_PROVIDES_DEP : type, dep);
	}
      queue_free(&bq);
      return;
    }
  if (i == 1)
    {
      queue_free(&bq);
      return;
    }

  /* go through all blocks and add a rule for each block */
  for (i = 0; i < bq.count; i++)
    {
      if (!bq.elements[i])
	continue;	/* huh? */
      if (bq.elements[i] == pool->nsolvables)
	{
	  /* conventional requires (cannot be a conflicts as they have been expanded) */
	  Id *dp = pool->whatprovidesdata + bq.elements[i + 1];
	  i += 2;
	  if (dontfix)
	    {
	      for (j = 0; dp[j] != 0; j++)
		if (pool->solvables[dp[j]].repo == installed)
		  break;		/* provider was installed */
	      if (!dp[j])
	        continue;
	    }
	  if (type == SOLVER_RULE_PKG_RECOMMENDS && !*dp)
	    continue;
	  /* check if the rule contains both p and -p */
	  for (j = 0; dp[j] != 0; j++)
	    if (dp[j] == p)
	      break;
	  if (dp[j])
	    continue;
	  addpkgrule(solv, -p, 0, dp - pool->whatprovidesdata, type, dep);
	  /* push all non-visited providers on the work queue */
	  if (m)
	    for (; *dp; dp++)
	      if (!MAPTST(m, *dp))
		queue_push(workq, *dp);
	  continue;
	}
      if (!bq.elements[i + 1])
	{
	  Id p2 = bq.elements[i++];
	  /* simple rule with just two literals, we'll add a (-p, p2) rule */
	  if (dontfix)
	    {
	      if (p2 < 0 && pool->solvables[-p2].repo == installed)
		continue;
	      if (p2 > 0 && pool->solvables[p2].repo != installed)
		continue;
	    }
	  if (-p == p2)
	    {
	      if (type == SOLVER_RULE_PKG_CONFLICTS)
		{
		  if (pool->forbidselfconflicts && !is_otherproviders_dep(pool, dep))
		    addpkgrule(solv, -p, 0, 0, SOLVER_RULE_PKG_SELF_CONFLICT, dep);
		  continue;
		}
	      addpkgrule(solv, -p, 0, 0, type, dep);
	      continue;
	    }
	  /* check if the rule contains both p and -p */
	  if (p == p2)
	    continue;
	  addpkgrule(solv, -p, p2, 0, type, dep);
	  if (m && p2 > 0 && !MAPTST(m, p2))
	    queue_push(workq, p2);
	}
      else
	{
	  Id *qele, d;
	  int qcnt;

	  qele = bq.elements + i;
	  qcnt = i;
	  while (bq.elements[i])
	     i++;
	  qcnt = i - qcnt;
	  if (dontfix)
	    {
	      for (j = 0; j < qcnt; j++)
		{
		  if (qele[j] > 0 && pool->solvables[qele[j]].repo == installed)
		    break;
		  if (qele[j] < 0 && pool->solvables[-qele[j]].repo != installed)
		    break;
		}
	      if (j == qcnt)
	        continue;
	    }
	  /* add -p to (ordered) rule (overwriting the trailing zero) */
	  for (j = 0; ; j++)
	    {
	      if (j == qcnt || qele[j] > -p)
		{
		  if (j < qcnt)
		    memmove(qele + j + 1, qele + j, (qcnt - j) * sizeof(Id));
		  qele[j] = -p;
		  qcnt++;
		  break;
		}
	      if (qele[j] == -p)
		break;
	    }
	  /* check if the rule contains both p and -p */
	  for (j = 0; j < qcnt; j++)
	    if (qele[j] == p)
	      break;
	  if (j < qcnt)
	    continue;
	  d = pool_ids2whatprovides(pool, qele + 1, qcnt - 1);
	  if (solv->ruleinfoq && qele[0] != p)
	    {
	      int oldcount = solv->ruleinfoq->count;
	      addpkgrule(solv, qele[0], 0, d, type, dep);
	      /* fixup from element of ruleinfo */
	      if (solv->ruleinfoq->count > oldcount && solv->ruleinfoq->elements[oldcount + 1] != p)
		{
		  if (solv->ruleinfoq->elements[oldcount + 2])
		    solv->ruleinfoq->elements[oldcount + 2] = solv->ruleinfoq->elements[oldcount + 1];
		  solv->ruleinfoq->elements[oldcount + 1] = p;
		}
	    }
	  else
	    addpkgrule(solv, qele[0], 0, d, type, dep);
	  if (m)
	    for (j = 0; j < qcnt; j++)
	      if (qele[j] > 0 && !MAPTST(m, qele[j]))
		queue_push(workq, qele[j]);
	}
    }
  queue_free(&bq);
}

#endif

#ifdef ENABLE_CONDA
void
add_conda_constrains_rule(Solver *solv, Id n, Id dep, int dontfix)
{
  Pool *pool = solv->pool;
  Reldep *rd;
  Id p, pp, pdep;
  if (!ISRELDEP(dep))
    return;
  rd = GETRELDEP(pool, dep);
  pdep = pool_whatprovides(pool, dep);
  FOR_PROVIDES(p, pp, rd->name)
    {
      Id p2;
      if (p == n)
	continue;
      if (dontfix && pool->solvables[p].repo == solv->installed)
	continue;
      while ((p2 = pool->whatprovidesdata[pdep]) != 0 && p2 < p)
	pdep++;
      if (p == p2)
	pdep++;
      else
        addpkgrule(solv, -n, -p, 0, SOLVER_RULE_PKG_CONSTRAINS, dep);
    }
}
#endif

/*-------------------------------------------------------------------
 *
 * add dependency rules for solvable
 *
 * s: Solvable for which to add rules
 * m: m[s] = 1 for solvables which have rules, prevent rule duplication
 *
 * Algorithm: 'visit all nodes of a graph'. The graph nodes are
 *  solvables, the edges their dependencies.
 *  Starting from an installed solvable, this will create all rules
 *  representing the graph created by the solvables dependencies.
 *
 * for unfulfilled requirements, conflicts, obsoletes,....
 * add a negative assertion for solvables that are not installable
 *
 * It will also create rules for all solvables referenced by 's'
 *  i.e. descend to all providers of requirements of 's'
 *
 */

void
solver_addpkgrulesforsolvable(Solver *solv, Solvable *s, Map *m)
{
  Pool *pool = solv->pool;
  Repo *installed = solv->installed;

  Queue workq;	/* list of solvables we still have to work on */
  Id workqbuf[64];
  Queue depq;	/* list of pre-req ids to ignore */
  Id depqbuf[16];

  int i;
  int dontfix;		/* ignore dependency errors for installed solvables */
  Id req, *reqp;
  Id con, *conp;
  Id obs, *obsp;
  Id rec, *recp;
  Id sug, *sugp;
  Id p, pp;		/* whatprovides loops */
  Id *dp;		/* ptr to 'whatprovides' */
  Id n;			/* Id for current solvable 's' */

  queue_init_buffer(&workq, workqbuf, sizeof(workqbuf)/sizeof(*workqbuf));
  queue_push(&workq, s - pool->solvables);	/* push solvable Id to work queue */

  queue_init_buffer(&depq, depqbuf, sizeof(depqbuf)/sizeof(*depqbuf));

  /* loop until there's no more work left */
  while (workq.count)
    {
      /*
       * n: Id of solvable
       * s: Pointer to solvable
       */

      n = queue_shift(&workq);		/* 'pop' next solvable to work on from queue */
      if (m)
	{
	  if (MAPTST(m, n))		/* continue if already visited */
	    continue;
	  MAPSET(m, n);			/* mark as visited */
	}

      s = pool->solvables + n;

      dontfix = 0;
      if (installed			/* Installed system available */
	  && s->repo == installed	/* solvable is installed */
	  && !solv->fixmap_all		/* NOT repair errors in dependency graph */
	  && !(solv->fixmap.size && MAPTST(&solv->fixmap, n - installed->start)))
        {
	  dontfix = 1;			/* dont care about broken deps */
        }

      if (!dontfix)
	{
	  if (s->arch == ARCH_SRC || s->arch == ARCH_NOSRC
		? pool_disabled_solvable(pool, s)
		: !pool_installable(pool, s))
	    {
	      POOL_DEBUG(SOLV_DEBUG_RULE_CREATION, "package %s [%d] is not installable\n", pool_solvid2str(pool, n), n);
	      addpkgrule(solv, -n, 0, 0, SOLVER_RULE_PKG_NOT_INSTALLABLE, 0);
	    }
	}

#ifdef ENABLE_LINKED_PKGS
      /* add pseudo-package <-> real-package links */
      if (has_package_link(pool, s))
        add_package_link(solv, s, m, &workq);
#endif

      /*-----------------------------------------
       * check requires of s
       */

      if (s->requires)
	{
	  int filterpre = 0;
	  reqp = s->repo->idarraydata + s->requires;
	  while ((req = *reqp++) != 0)            /* go through all requires */
	    {
	      if (req == SOLVABLE_PREREQMARKER)   /* skip the marker */
		{
		  if (installed && s->repo == installed)
		    {
		      solvable_lookup_idarray(s, SOLVABLE_PREREQ_IGNOREINST, &depq);
		      filterpre = depq.count;
		    }
		  continue;
		}
	      if (filterpre)
		{
		  /* check if this id is filtered. assumes that depq.count is small */
		  for (i = 0; i < depq.count; i++)
		    if (req == depq.elements[i])
		      break;
		  if (i < depq.count)
		    {
		      POOL_DEBUG(SOLV_DEBUG_RULE_CREATION, "package %s: ignoring filtered pre-req dependency %s\n", pool_solvable2str(pool, s), pool_dep2str(pool, req));
		      continue;
		    }
		}

#ifdef ENABLE_COMPLEX_DEPS
	      if (pool_is_complex_dep(pool, req))
		{
		  /* we have AND/COND deps, normalize */
		  add_complex_deprules(solv, n, req, SOLVER_RULE_PKG_REQUIRES, dontfix, &workq, m);
		  continue;
		}
#endif

	      /* find list of solvables providing 'req' */
	      dp = pool_whatprovides_ptr(pool, req);

	      if (*dp == SYSTEMSOLVABLE)	  /* always installed */
		continue;

	      if (dontfix)
		{
		  /* the strategy here is to not insist on dependencies
                   * that are already broken. so if we find one provider
                   * that was already installed, we know that the
                   * dependency was not broken before so we enforce it */
		  for (i = 0; (p = dp[i]) != 0; i++)
		    if (pool->solvables[p].repo == installed)
		      break;		/* found installed provider */
		  if (!p)
		    {
		      /* didn't find an installed provider: previously broken dependency */
		      POOL_DEBUG(SOLV_DEBUG_RULE_CREATION, "ignoring broken requires %s of installed package %s\n", pool_dep2str(pool, req), pool_solvable2str(pool, s));
		      continue;
		    }
		}

	      if (!*dp)
		{
		  POOL_DEBUG(SOLV_DEBUG_RULE_CREATION, "package %s [%d] is not installable (%s)\n", pool_solvid2str(pool, n), n, pool_dep2str(pool, req));
		  addpkgrule(solv, -n, 0, 0, SOLVER_RULE_PKG_NOTHING_PROVIDES_DEP, req);
		  continue;
		}

	      for (i = 0; dp[i] != 0; i++)
	        if (n == dp[i])
		  break;
	      if (dp[i])
		continue;		/* provided by itself, no need to add rule */

	      IF_POOLDEBUG (SOLV_DEBUG_RULE_CREATION)
	        {
		  POOL_DEBUG(SOLV_DEBUG_RULE_CREATION,"  %s requires %s\n", pool_solvable2str(pool, s), pool_dep2str(pool, req));
		  for (i = 0; dp[i]; i++)
		    POOL_DEBUG(SOLV_DEBUG_RULE_CREATION, "   provided by %s\n", pool_solvid2str(pool, dp[i]));
	        }

	      /* add 'requires' dependency */
              /* rule: (-requestor|provider1|provider2|...|providerN) */
	      addpkgrule(solv, -n, 0, dp - pool->whatprovidesdata, SOLVER_RULE_PKG_REQUIRES, req);

	      /* push all non-visited providers on the work queue */
	      if (m)
	        for (; *dp; dp++)
		  if (!MAPTST(m, *dp))
		    queue_push(&workq, *dp);
	    }
	}

      if (s->recommends && solv->strongrecommends)
	{
	  int start = solv->nrules;
	  solv->lastpkgrule = 0;
	  reqp = s->repo->idarraydata + s->recommends;
	  while ((req = *reqp++) != 0)            /* go through all recommends */
	    {
#ifdef ENABLE_COMPLEX_DEPS
	      if (pool_is_complex_dep(pool, req))
		{
		  /* we have AND/COND deps, normalize */
		  add_complex_deprules(solv, n, req, SOLVER_RULE_PKG_RECOMMENDS, dontfix, &workq, m);
		  continue;
		}
#endif
	      dp = pool_whatprovides_ptr(pool, req);
	      if (*dp == SYSTEMSOLVABLE || !*dp)	  /* always installed or not installable */
		continue;
	      for (i = 0; dp[i] != 0; i++)
	        if (n == dp[i])
		  break;
	      if (dp[i])
		continue;		/* provided by itself, no need to add rule */
	      addpkgrule(solv, -n, 0, dp - pool->whatprovidesdata, SOLVER_RULE_PKG_RECOMMENDS, req);
	      if (m)
	        for (; *dp; dp++)
		  if (!MAPTST(m, *dp))
		    queue_push(&workq, *dp);
	    }
	  if (!solv->ruleinfoq && start < solv->nrules)
	    {
	      if (!solv->recommendsruleq)
		{
		  solv->recommendsruleq = solv_calloc(1, sizeof(Queue));
		  queue_init(solv->recommendsruleq);
		}
	      for (i = start; i < solv->nrules; i++)
		queue_push(solv->recommendsruleq, i);
	      solv->lastpkgrule = 0;
	    }
	}

#ifdef ENABLE_CONDA
      if (pool->disttype == DISTTYPE_CONDA)
	{
	  solvable_lookup_idarray(s, SOLVABLE_CONSTRAINS, &depq);
	  for (i = 0; i < depq.count; i++)
	    add_conda_constrains_rule(solv, n, depq.elements[i], dontfix);
	}
#endif

      /* that's all we check for src packages */
      if (s->arch == ARCH_SRC || s->arch == ARCH_NOSRC)
	continue;

      /*-----------------------------------------
       * check conflicts of s
       */

      if (s->conflicts)
	{
	  int ispatch = 0;

	  /* we treat conflicts in patches a bit differen:
	   * - nevr matching
	   * - multiversion handling
	   * XXX: we should really handle this different, looking
	   * at the name is a bad hack
	   */
	  if (!strncmp("patch:", pool_id2str(pool, s->name), 6))
	    ispatch = 1;
	  conp = s->repo->idarraydata + s->conflicts;
	  /* foreach conflicts of 's' */
	  while ((con = *conp++) != 0)
	    {
#ifdef ENABLE_COMPLEX_DEPS
	      if (!ispatch && pool_is_complex_dep(pool, con))
		{
		  /* we have AND/COND deps, normalize */
		  add_complex_deprules(solv, n, con, SOLVER_RULE_PKG_CONFLICTS, dontfix, &workq, m);
		  continue;
		}
#endif
	      /* foreach providers of a conflict of 's' */
	      FOR_PROVIDES(p, pp, con)
		{
		  if (ispatch && !pool_match_nevr(pool, pool->solvables + p, con))
		    continue;
		  /* dontfix: dont care about conflicts with already installed packs */
		  if (dontfix && pool->solvables[p].repo == installed)
		    continue;
		  if (p == n)		/* p == n: self conflict */
		    {
		      if (!pool->forbidselfconflicts || is_otherproviders_dep(pool, con))
			continue;
		      addpkgrule(solv, -n, 0, 0, SOLVER_RULE_PKG_SELF_CONFLICT, con);
		      continue;
		    }
		  if (ispatch && solv->multiversion.size && MAPTST(&solv->multiversion, p) && ISRELDEP(con))
		    {
		      /* our patch conflicts with a multiversion package */
		      Id d = makemultiversionconflict(solv, p, con);
		      if (d)
			{
			  addpkgrule(solv, -n, 0, d, SOLVER_RULE_PKG_CONFLICTS, con);
			  continue;
			}
		    }
		  if (p == SYSTEMSOLVABLE)
		    p = 0;
                  /* rule: -n|-p: either solvable _or_ provider of conflict */
		  addpkgrule(solv, -n, -p, 0, SOLVER_RULE_PKG_CONFLICTS, con);
		}
	    }
	}

      /*-----------------------------------------
       * check obsoletes and implicit obsoletes of a package
       * if ignoreinstalledsobsoletes is not set, we're also checking
       * obsoletes of installed packages (like newer rpm versions)
       */
      if ((!installed || s->repo != installed) || !pool->noinstalledobsoletes)
	{
	  int multi = solv->multiversion.size && MAPTST(&solv->multiversion, n);
	  int isinstalled = (installed && s->repo == installed);
	  if (s->obsoletes && (!multi || solv->keepexplicitobsoletes))
	    {
	      obsp = s->repo->idarraydata + s->obsoletes;
	      /* foreach obsoletes */
	      while ((obs = *obsp++) != 0)
		{
		  /* foreach provider of an obsoletes of 's' */
		  FOR_PROVIDES(p, pp, obs)
		    {
		      Solvable *ps = pool->solvables + p;
		      if (p == n)
			continue;
		      if (isinstalled && dontfix && ps->repo == installed)
			continue;	/* don't repair installed/installed problems */
		      if (!pool->obsoleteusesprovides /* obsoletes are matched names, not provides */
			  && !pool_match_nevr(pool, ps, obs))
			continue;
		      if (pool->obsoleteusescolors && !pool_colormatch(pool, s, ps))
			continue;
		      if (p == SYSTEMSOLVABLE)
			p = 0;
		      if (!isinstalled)
			addpkgrule(solv, -n, -p, 0, SOLVER_RULE_PKG_OBSOLETES, obs);
		      else
			addpkgrule(solv, -n, -p, 0, SOLVER_RULE_PKG_INSTALLED_OBSOLETES, obs);
		    }
		}
	    }
	  /* check implicit obsoletes
           * for installed packages we only need to check installed/installed problems (and
           * only when dontfix is not set), as the others are picked up when looking at the
           * uninstalled package.
           */
	  if (!isinstalled || !dontfix)
	    {
	      FOR_PROVIDES(p, pp, s->name)
		{
		  Solvable *ps = pool->solvables + p;
		  if (p == n)
		    continue;
		  if (isinstalled && ps->repo != installed)
		    continue;
		  /* we still obsolete packages with same nevra, like rpm does */
		  /* (actually, rpm mixes those packages. yuck...) */
		  if (multi && (s->name != ps->name || s->evr != ps->evr || s->arch != ps->arch))
		    {
		      if (isinstalled || ps->repo != installed)
		        continue;
		      /* also check the installed package for multi-ness */
		      if (MAPTST(&solv->multiversion, p))
		        continue;
		    }
		  if (!pool->implicitobsoleteusesprovides && s->name != ps->name)
		    continue;
		  if (pool->implicitobsoleteusescolors && !pool_colormatch(pool, s, ps))
		    continue;
		  if (p == SYSTEMSOLVABLE)
		    p = 0;
		  if (s->name == ps->name)
		    {
		      /* optimization: do not add the same-name conflict rule if it was
		       * already added when we looked at the other package.
		       * (this assumes pool_colormatch is symmetric) */
		      if (p && m && ps->repo != installed && MAPTST(m, p) &&
			  (ps->arch != ARCH_SRC && ps->arch != ARCH_NOSRC) &&
			  !(solv->multiversion.size && MAPTST(&solv->multiversion, p)))
			continue;
		      addpkgrule(solv, -n, -p, 0, SOLVER_RULE_PKG_SAME_NAME, 0);
		    }
		  else
		    addpkgrule(solv, -n, -p, 0, SOLVER_RULE_PKG_IMPLICIT_OBSOLETES, s->name);
		}
	    }
	}

      if (m && pool->implicitobsoleteusescolors && pool_arch2score(pool, s->arch) > 1)
	{
	  unsigned int pa, a = pool_arch2score(pool, s->arch);
	  /* check lock-step candidates */
	  FOR_PROVIDES(p, pp, s->name)
	    {
	      Solvable *ps = pool->solvables + p;
	      if (s->name != ps->name || s->evr != ps->evr || MAPTST(m, p))
		continue;
	      pa = pool_arch2score(pool, ps->arch);
	      if (!pa || pa == 1 || pa >= a)
		continue;
	      queue_push(&workq, p);
	    }
	}

      /*-----------------------------------------
       * add recommends/suggests to the work queue
       */
      if (s->recommends && m)
	{
	  recp = s->repo->idarraydata + s->recommends;
	  while ((rec = *recp++) != 0)
	    {
#ifdef ENABLE_COMPLEX_DEPS
	      if (pool_is_complex_dep(pool, rec))
		{
		  pool_add_pos_literals_complex_dep(pool, rec, &workq, m, 0);
		  continue;
		}
#endif
	      FOR_PROVIDES(p, pp, rec)
		if (!MAPTST(m, p))
		  queue_push(&workq, p);
	    }
	}
      if (s->suggests && m)
	{
	  sugp = s->repo->idarraydata + s->suggests;
	  while ((sug = *sugp++) != 0)
	    {
#ifdef ENABLE_COMPLEX_DEPS
	      if (pool_is_complex_dep(pool, sug))
		{
		  pool_add_pos_literals_complex_dep(pool, sug, &workq, m, 0);
		  continue;
		}
#endif
	      FOR_PROVIDES(p, pp, sug)
		if (!MAPTST(m, p))
		  queue_push(&workq, p);
	    }
	}
    }
  queue_free(&depq);
  queue_free(&workq);
}

#ifdef ENABLE_LINKED_PKGS
void
solver_addpkgrulesforlinked(Solver *solv, Map *m)
{
  Pool *pool = solv->pool;
  Solvable *s;
  int i, j;
  Queue qr;

  queue_init(&qr);
  for (i = 1; i < pool->nsolvables; i++)
    {
      if (MAPTST(m, i))
	continue;
      s = pool->solvables + i;
      if (!s->repo || s->repo == solv->installed)
	continue;
      if (!strchr(pool_id2str(pool, s->name), ':'))
	continue;
      if (!pool_installable(pool, s))
	continue;
      find_package_link(pool, s, 0, &qr, 0, 0);
      if (qr.count)
	{
	  for (j = 0; j < qr.count; j++)
	    if (MAPTST(m, qr.elements[j]))
	      {
	        solver_addpkgrulesforsolvable(solv, s, m);
	        break;
	      }
	  queue_empty(&qr);
	}
    }
  queue_free(&qr);
}
#endif

/*-------------------------------------------------------------------
 *
 * Add rules for packages possibly selected in by weak dependencies
 *
 * m: already added solvables
 */

void
solver_addpkgrulesforweak(Solver *solv, Map *m)
{
  Pool *pool = solv->pool;
  Solvable *s;
  Id sup, *supp;
  int i, n;

  /* foreach solvable in pool */
  for (i = n = 1; n < pool->nsolvables; i++, n++)
    {
      if (i == pool->nsolvables)		/* wrap i */
	i = 1;
      if (MAPTST(m, i))				/* already added that one */
	continue;

      s = pool->solvables + i;
      if (!s->repo)
	continue;
      if (s->repo != pool->installed && !pool_installable(pool, s))
	continue;	/* only look at installable ones */

      sup = 0;
      if (s->supplements)
	{
	  /* find possible supplements */
	  supp = s->repo->idarraydata + s->supplements;
	  while ((sup = *supp++) != 0)
	    if (solver_dep_possible(solv, sup, m))
	      break;
	}

      /* if nothing found, check for enhances */
      if (!sup && s->enhances)
	{
	  supp = s->repo->idarraydata + s->enhances;
	  while ((sup = *supp++) != 0)
	    if (solver_dep_possible(solv, sup, m))
	      break;
	}
      /* if nothing found, goto next solvables */
      if (!sup)
	continue;
      solver_addpkgrulesforsolvable(solv, s, m);
      n = 0;			/* check all solvables again because we added solvables to m */
    }
}


/*-------------------------------------------------------------------
 *
 * add package rules for possible updates
 *
 * s: solvable
 * m: map of already visited solvables
 * allow_all: 0 = dont allow downgrades, 1 = allow all candidates
 */

void
solver_addpkgrulesforupdaters(Solver *solv, Solvable *s, Map *m, int allow_all)
{
  Pool *pool = solv->pool;
  int i;
    /* queue and buffer for it */
  Queue qs;
  Id qsbuf[64];

  queue_init_buffer(&qs, qsbuf, sizeof(qsbuf)/sizeof(*qsbuf));
    /* find update candidates for 's' */
  policy_findupdatepackages(solv, s, &qs, allow_all);
    /* add rule for 's' if not already done */
  if (!MAPTST(m, s - pool->solvables))
    solver_addpkgrulesforsolvable(solv, s, m);
    /* foreach update candidate, add rule if not already done */
  for (i = 0; i < qs.count; i++)
    if (!MAPTST(m, qs.elements[i]))
      solver_addpkgrulesforsolvable(solv, pool->solvables + qs.elements[i], m);
  queue_free(&qs);
}


/***********************************************************************
 ***
 ***  Update/Feature rule part
 ***
 ***  Those rules make sure an installed package isn't silently deleted
 ***
 ***/

static int
dup_maykeepinstalled(Solver *solv, Solvable *s)
{
  Pool *pool = solv->pool;
  Id ip, pp;

  if (solv->dupmap.size && MAPTST(&solv->dupmap,  s - pool->solvables))
    return 1;
  /* is installed identical to a good one? */
  FOR_PROVIDES(ip, pp, s->name)
    {
      Solvable *is = pool->solvables + ip;
      if (is->evr != s->evr)
	continue;
      if (solv->dupmap.size)
	{
	  if (!MAPTST(&solv->dupmap, ip))
	    continue;
	}
      else if (is->repo == pool->installed)
	continue;
      if (solvable_identical(s, is))
	return 1;
    }
  return 0;
}


/* stash away the original updaters for multiversion packages. We do this so that
 * we can update the package later */
static inline void
set_specialupdaters(Solver *solv, Solvable *s, Id d)
{
  Repo *installed = solv->installed;
  if (!solv->specialupdaters)
    solv->specialupdaters = solv_calloc(installed->end - installed->start, sizeof(Id));
  solv->specialupdaters[s - solv->pool->solvables - installed->start] = d;
}

#ifdef ENABLE_LINKED_PKGS
/* Check if this is a linked pseudo package. As it is linked, we do not need an update/feature rule */
static inline int
is_linked_pseudo_package(Solver *solv, Solvable *s)
{
  Pool *pool = solv->pool;
  if (solv->instbuddy && solv->instbuddy[s - pool->solvables - solv->installed->start])
    {
      const char *name = pool_id2str(pool, s->name);
      if (strncmp(name, "pattern:", 8) == 0 || strncmp(name, "application:", 12) == 0)
	return 1;
    }
  return 0;
}
#endif

void
solver_addfeaturerule(Solver *solv, Solvable *s)
{
  Pool *pool = solv->pool;
  int i;
  Id p;
  Queue qs;
  Id qsbuf[64];

#ifdef ENABLE_LINKED_PKGS
  if (is_linked_pseudo_package(solv, s))
    {
      solver_addrule(solv, 0, 0, 0);	/* no feature rules for those */
      return;
    }
#endif
  queue_init_buffer(&qs, qsbuf, sizeof(qsbuf)/sizeof(*qsbuf));
  p = s - pool->solvables;
  policy_findupdatepackages(solv, s, &qs, 1);
  if (solv->dupinvolvedmap_all || (solv->dupinvolvedmap.size && MAPTST(&solv->dupinvolvedmap, p)))
    {
      if (!dup_maykeepinstalled(solv, s))
	{
	  for (i = 0; i < qs.count; i++)
	    {
	      Solvable *ns = pool->solvables + qs.elements[i];
	      if (ns->repo != pool->installed || dup_maykeepinstalled(solv, ns))
		break;
	    }
	  if (i == qs.count)
	    {
	      solver_addrule(solv, 0, 0, 0);	/* this is an orphan */
	      queue_free(&qs);
	      return;
	    }
	}
    }
  if (qs.count > 1)
    {
      Id d = pool_queuetowhatprovides(pool, &qs);
      queue_free(&qs);
      solver_addrule(solv, p, 0, d);	/* allow update of s */
    }
  else
    {
      Id d = qs.count ? qs.elements[0] : 0;
      queue_free(&qs);
      solver_addrule(solv, p, d, 0);	/* allow update of s */
    }
}

/* check if multiversion solvable s2 has an obsoletes for installed solvable s */
static int
is_multiversion_obsoleteed(Pool *pool, Solvable *s, Solvable *s2)
{
  Id *wp, obs, *obsp;

  if (pool->obsoleteusescolors && !pool_colormatch(pool, s, s2))
    return 0;
  obsp = s2->repo->idarraydata + s2->obsoletes;
  if (!pool->obsoleteusesprovides)
    {
      while ((obs = *obsp++) != 0)
        if (pool_match_nevr(pool, s, obs))
	  return 1;
    }
  else
    {
      while ((obs = *obsp++) != 0)
        for (wp = pool_whatprovides_ptr(pool, obs); *wp; wp++)
	  if (pool->solvables + *wp == s)
	    return 1;
    }
  return 0;
}

/*-------------------------------------------------------------------
 *
 * add rule for update
 *   (A|A1|A2|A3...)  An = update candidates for A
 *
 * s = (installed) solvable
 */

void
solver_addupdaterule(Solver *solv, Solvable *s)
{
  /* installed packages get a special upgrade allowed rule */
  Pool *pool = solv->pool;
  Id p, d;
  Queue qs;
  Id qsbuf[64];
  Rule *r;
  int dupinvolved = 0;

  p = s - pool->solvables;

  if (pool->considered && pool_disabled_solvable(pool, s))
    {
      /* disabled installed solvables must stay installed */
      solver_addrule(solv, p, 0, 0);
      return;
    }

  /* Orphan detection. We cheat by looking at the feature rule, which
   * we already calculated */
  r = solv->rules + solv->featurerules + (p - solv->installed->start);
  if (!r->p)
    {
#ifdef ENABLE_LINKED_PKGS
      if (is_linked_pseudo_package(solv, s))
	{
	  solver_addrule(solv, 0, 0, 0);
	  return;
	}
#endif
      p = 0;
      queue_push(&solv->orphaned, s - pool->solvables);		/* an orphaned package */
      if (solv->keep_orphans && !(solv->droporphanedmap_all || (solv->droporphanedmap.size && MAPTST(&solv->droporphanedmap, s - pool->solvables - solv->installed->start))))
	p = s - pool->solvables;	/* keep this orphaned package installed */
      solver_addrule(solv, p, 0, 0);
      return;
    }

  /* find update candidates for 's' */
  queue_init_buffer(&qs, qsbuf, sizeof(qsbuf)/sizeof(*qsbuf));
  dupinvolved = solv->dupinvolvedmap_all || (solv->dupinvolvedmap.size && MAPTST(&solv->dupinvolvedmap, p));
  policy_findupdatepackages(solv, s, &qs, dupinvolved ? 2 : 0);

  if (qs.count && solv->multiversion.size)
    {
      int i, j;

      for (i = 0; i < qs.count; i++)
	if (MAPTST(&solv->multiversion, qs.elements[i]))
	  break;
      if (i < qs.count)
	{
	  /* filter out all multiversion packages as they don't update */
	  d = pool_queuetowhatprovides(pool, &qs);	/* save qs away */
	  for (j = i; i < qs.count; i++)
	     {
	      if (MAPTST(&solv->multiversion, qs.elements[i]))
		{
		  Solvable *ps = pool->solvables + qs.elements[i];
		  /* check if there is an explicit obsoletes */
		  if (solv->keepexplicitobsoletes && ps->obsoletes && is_multiversion_obsoleteed(pool, s, ps))
		    {
		      qs.elements[j++] = qs.elements[i];
		      continue;
		    }
		  /* it's ok if they have same nevra */
		  if (ps->name != s->name || ps->evr != s->evr || ps->arch != s->arch)
		    continue;
		}
	      qs.elements[j++] = qs.elements[i];
	    }

	  if (j == 0 && dupinvolved && !dup_maykeepinstalled(solv, s))
	    {
	      /* this is a multiversion orphan */
	      queue_push(&solv->orphaned, p);
	      set_specialupdaters(solv, s, d);
	      if (solv->keep_orphans && !(solv->droporphanedmap_all || (solv->droporphanedmap.size && MAPTST(&solv->droporphanedmap, p - solv->installed->start))))
		{
		  /* we need to keep the orphan */
		  queue_free(&qs);
		  solver_addrule(solv, p, 0, 0);
		  return;
		}
	      /* we can drop it as long as we update */
	      j = qs.count;
	    }

	  if (j < qs.count)		/* filtered at least one package? */
	    {
	      if (d && (solv->updatemap_all || (solv->updatemap.size && MAPTST(&solv->updatemap, p - solv->installed->start))))
		{
		  /* non-orphan multiversion package, set special updaters if we want an update */
		  set_specialupdaters(solv, s, d);
		}
	      qs.count = j;
	    }
	  else
	    {
	      /* could fallthrough, but then we would do pool_queuetowhatprovides twice */
	      queue_free(&qs);
	      solver_addrule(solv, p, 0, d);	/* allow update of s */
	      return;
	    }
	}
    }
  if (qs.count > 1)
    {
      d = pool_queuetowhatprovides(pool, &qs);
      queue_free(&qs);
      solver_addrule(solv, p, 0, d);	/* allow update of s */
    }
  else
    {
      d = qs.count ? qs.elements[0] : 0;
      queue_free(&qs);
      solver_addrule(solv, p, d, 0);	/* allow update of s */
    }
}

static inline void
disableupdaterule(Solver *solv, Id p)
{
  Rule *r;

  MAPSET(&solv->noupdate, p - solv->installed->start);
  r = solv->rules + solv->updaterules + (p - solv->installed->start);
  if (r->p && r->d >= 0)
    solver_disablerule(solv, r);
  r = solv->rules + solv->featurerules + (p - solv->installed->start);
  if (r->p && r->d >= 0)
    solver_disablerule(solv, r);
  if (solv->bestrules_info)
    {
      int i, ni;
      ni = solv->bestrules_end - solv->bestrules;
      for (i = solv->bestrules_up - solv->bestrules; i < ni; i++)
	if (solv->bestrules_info[i] == p)
	  solver_disablerule(solv, solv->rules + solv->bestrules + i);
    }
}

static inline void
reenableupdaterule(Solver *solv, Id p)
{
  Pool *pool = solv->pool;
  Rule *r;

  MAPCLR(&solv->noupdate, p - solv->installed->start);
  r = solv->rules + solv->updaterules + (p - solv->installed->start);
  if (r->p)
    {
      if (r->d < 0)
	{
	  solver_enablerule(solv, r);
	  IF_POOLDEBUG (SOLV_DEBUG_SOLUTIONS)
	    {
	      POOL_DEBUG(SOLV_DEBUG_SOLUTIONS, "@@@ re-enabling ");
	      solver_printruleclass(solv, SOLV_DEBUG_SOLUTIONS, r);
	    }
	}
    }
  else
    {
      r = solv->rules + solv->featurerules + (p - solv->installed->start);
      if (r->p && r->d < 0)
	{
	  solver_enablerule(solv, r);
	  IF_POOLDEBUG (SOLV_DEBUG_SOLUTIONS)
	    {
	      POOL_DEBUG(SOLV_DEBUG_SOLUTIONS, "@@@ re-enabling ");
	      solver_printruleclass(solv, SOLV_DEBUG_SOLUTIONS, r);
	    }
	}
    }
  if (solv->bestrules_info)
    {
      int i, ni;
      ni = solv->bestrules_end - solv->bestrules;
      for (i = solv->bestrules_up - solv->bestrules; i < ni; i++)
	if (solv->bestrules_info[i] == p)
	  solver_enablerule(solv, solv->rules + solv->bestrules + i);
    }
}


/***********************************************************************
 ***
 ***  Infarch rule part
 ***
 ***  Infarch rules make sure the solver uses the best architecture of
 ***  a package if multiple archetectures are available
 ***
 ***/

void
solver_addinfarchrules(Solver *solv, Map *addedmap)
{
  Pool *pool = solv->pool;
  Repo *installed = pool->installed;
  int first, i, j;
  Id p, pp, aa;
  unsigned int a, bestscore;
  Solvable *s, *ps, *bests;
  Queue badq, allowedarchs;
  Queue lsq;

  queue_init(&badq);
  queue_init(&allowedarchs);
  queue_init(&lsq);
  solv->infarchrules = solv->nrules;
  for (i = 1; i < pool->nsolvables; i++)
    {
      if (i == SYSTEMSOLVABLE || !MAPTST(addedmap, i))
	continue;
      s = pool->solvables + i;
      first = i;
      bestscore = 0;
      bests = 0;
      queue_empty(&allowedarchs);
      FOR_PROVIDES(p, pp, s->name)
	{
	  ps = pool->solvables + p;
	  if (ps->name != s->name || !MAPTST(addedmap, p))
	    continue;
	  if (p == i)
	    first = 0;
	  if (first)
	    break;
	  a = pool_arch2score(pool, ps->arch);
	  if (a != 1 && installed && ps->repo == installed)
	    {
	      if (solv->dupinvolvedmap_all || (solv->dupinvolvedmap.size && MAPTST(&solv->dupinvolvedmap, p)))
		continue;
	      queue_pushunique(&allowedarchs, ps->arch);	/* also ok to keep this architecture */
	      continue;		/* but ignore installed solvables when calculating the best arch */
	    }
	  if (a && a != 1 && (!bestscore || a < bestscore))
	    {
	      bestscore = a;
	      bests = ps;
	    }
	}
      if (first)
	continue;		/* not the first in the group */

      if (!bestscore && allowedarchs.count > 1 && pool->implicitobsoleteusescolors)
	{
	  for (j = 0; j < allowedarchs.count; j++)
	    {
	      a = pool_arch2score(pool, allowedarchs.elements[j]);
	      if (a && a != 1 && (!bestscore || a < bestscore))
		bestscore = a;
	    }
	}

      if (!bestscore)
	continue;		/* did not find a score for this group */

      /* speed up common case where installed package already has best arch */
      if (allowedarchs.count == 1 && bests && allowedarchs.elements[0] == bests->arch)
	allowedarchs.count--;	/* installed arch is best */

      if (allowedarchs.count && pool->implicitobsoleteusescolors && installed)
	{
	  /* need an extra pass for lockstep checking: we only allow to keep an inferior arch
	   * if the corresponding installed package is not lock-stepped */
	  queue_empty(&allowedarchs);
	  FOR_PROVIDES(p, pp, s->name)
	    {
	      Id p2, pp2;
	      ps = pool->solvables + p;
	      if (ps->name != s->name || ps->repo != installed || !MAPTST(addedmap, p))
		continue;
	      if (solv->dupinvolvedmap_all || (solv->dupinvolvedmap.size && MAPTST(&solv->dupinvolvedmap, p)))
		continue;
	      a = pool_arch2score(pool, ps->arch);
	      if (!a)
		{
		  queue_pushunique(&allowedarchs, ps->arch);	/* strange arch, allow */
		  continue;
		}
	      if (a == 1 || ((a ^ bestscore) & 0xffff0000) == 0)
		continue;
	      /* have installed package with inferior arch, check if lock-stepped */
	      FOR_PROVIDES(p2, pp2, s->name)
		{
		  Solvable *s2 = pool->solvables + p2;
		  unsigned int a2;
		  if (p2 == p || s2->name != s->name || s2->evr != pool->solvables[p].evr || s2->arch == pool->solvables[p].arch)
		    continue;
		  a2 = pool_arch2score(pool, s2->arch);
		  if (a2 && (a2 == 1 || ((a2 ^ bestscore) & 0xffff0000) == 0))
		    break;
		}
	      if (!p2)
		queue_pushunique(&allowedarchs, ps->arch);
	    }
	}

      /* find all bad packages */
      queue_empty(&badq);
      FOR_PROVIDES(p, pp, s->name)
	{
	  ps = pool->solvables + p;
	  if (ps->name != s->name || !MAPTST(addedmap, p))
	    continue;
	  a = pool_arch2score(pool, ps->arch);
	  if (a != 1 && ((a ^ bestscore) & 0xffff0000) != 0)
	    {
	      if (installed && ps->repo == installed)
		{
		  if (pool->implicitobsoleteusescolors)
		    queue_push(&badq, p);		/* special lock-step handling, see below */
		  continue;	/* always ok to keep an installed package */
		}
	      for (j = 0; j < allowedarchs.count; j++)
		{
		  unsigned int aas;
		  aa = allowedarchs.elements[j];
		  if (ps->arch == aa)
		    break;
		  aas = pool_arch2score(pool, aa);
		  if (aas && ((a ^ aas) & 0xffff0000) == 0)
		    break;	/* compatible */
		}
	      if (j == allowedarchs.count)
		queue_push(&badq, p);
	    }
	}

      /* block all solvables in the badq! */
      for (j = 0; j < badq.count; j++)
	{
	  p = badq.elements[j];
	  /* special lock-step handling */
	  if (pool->implicitobsoleteusescolors)
	    {
	      Id p2;
	      int haveinstalled = 0;
	      queue_empty(&lsq);
	      FOR_PROVIDES(p2, pp, s->name)
		{
		  Solvable *s2 = pool->solvables + p2;
		  if (p2 == p || s2->name != s->name || s2->evr != pool->solvables[p].evr || s2->arch == pool->solvables[p].arch)
		    continue;
		  a = pool_arch2score(pool, s2->arch);
		  if (a && (a == 1 || ((a ^ bestscore) & 0xffff000) == 0))
		    {
		      queue_push(&lsq, p2);
		      if (installed && s2->repo == installed)
			haveinstalled = 1;
		    }
		}
	      if (installed && pool->solvables[p].repo == installed && !haveinstalled)
		continue;	/* installed package not in lock-step */
	      if (lsq.count < 2)
		solver_addrule(solv, -p, lsq.count ? lsq.elements[0] : 0, 0);
	      else
		solver_addrule(solv, -p, 0, pool_queuetowhatprovides(pool, &lsq));
	    }
	  else
	    {
	      solver_addrule(solv, -p, 0, 0);
	    }
	}
    }
  queue_free(&lsq);
  queue_free(&badq);
  queue_free(&allowedarchs);
  solv->infarchrules_end = solv->nrules;
}

static inline void
disableinfarchrule(Solver *solv, Id name)
{
  Pool *pool = solv->pool;
  Rule *r;
  int i;
  for (i = solv->infarchrules, r = solv->rules + i; i < solv->infarchrules_end; i++, r++)
    {
      if (r->p < 0 && r->d >= 0 && pool->solvables[-r->p].name == name)
        solver_disablerule(solv, r);
    }
}

static inline void
reenableinfarchrule(Solver *solv, Id name)
{
  Pool *pool = solv->pool;
  Rule *r;
  int i;
  for (i = solv->infarchrules, r = solv->rules + i; i < solv->infarchrules_end; i++, r++)
    {
      if (r->p < 0 && r->d < 0 && pool->solvables[-r->p].name == name)
        {
          solver_enablerule(solv, r);
          IF_POOLDEBUG (SOLV_DEBUG_SOLUTIONS)
            {
              POOL_DEBUG(SOLV_DEBUG_SOLUTIONS, "@@@ re-enabling ");
              solver_printruleclass(solv, SOLV_DEBUG_SOLUTIONS, r);
            }
        }
    }
}


/***********************************************************************
 ***
 ***  Dup rule part
 ***
 ***  Dup rules make sure a package is selected from the specified dup
 ***  repositories if an update candidate is included in one of them.
 ***
 ***/

static inline void
add_cleandeps_updatepkg(Solver *solv, Id p)
{
  if (!solv->cleandeps_updatepkgs)
    {
      solv->cleandeps_updatepkgs = solv_calloc(1, sizeof(Queue));
      queue_init(solv->cleandeps_updatepkgs);
    }
  queue_pushunique(solv->cleandeps_updatepkgs, p);
}

static void
solver_addtodupmaps(Solver *solv, Id p, Id how, int targeted)
{
  Pool *pool = solv->pool;
  Solvable *ps, *s = pool->solvables + p;
  Repo *installed = solv->installed;
  Id pi, pip, obs, *obsp;

  if (!solv->dupinvolvedmap.size)
    map_grow(&solv->dupinvolvedmap, pool->nsolvables);

  MAPSET(&solv->dupinvolvedmap, p);
  if (targeted)
    MAPSET(&solv->dupmap, p);
  FOR_PROVIDES(pi, pip, s->name)
    {
      ps = pool->solvables + pi;
      if (ps->name != s->name)
	continue;
      MAPSET(&solv->dupinvolvedmap, pi);
      if (targeted && ps->repo == installed && solv->obsoletes && solv->obsoletes[pi - installed->start])
	{
	  Id *opp, pi2;
	  for (opp = solv->obsoletes_data + solv->obsoletes[pi - installed->start]; (pi2 = *opp++) != 0;)
	    if (pool->solvables[pi2].repo != installed)
	      MAPSET(&solv->dupinvolvedmap, pi2);
	}
      if (ps->repo == installed && (how & SOLVER_FORCEBEST) != 0 && !solv->bestupdatemap_all)
	{
	  if (!solv->bestupdatemap.size)
	    map_grow(&solv->bestupdatemap, installed->end - installed->start);
	  MAPSET(&solv->bestupdatemap, pi - installed->start);
	}
      if (ps->repo == installed && (how & SOLVER_CLEANDEPS) != 0)
	add_cleandeps_updatepkg(solv, pi);
      if (!targeted && ps->repo != installed)
	MAPSET(&solv->dupmap, pi);
    }
  if (s->repo == installed && solv->obsoletes && solv->obsoletes[p - installed->start])
    {
      Id *opp;
      for (opp = solv->obsoletes_data + solv->obsoletes[p - installed->start]; (pi = *opp++) != 0;)
	{
	  ps = pool->solvables + pi;
	  if (ps->repo == installed)
	    continue;
	  MAPSET(&solv->dupinvolvedmap, pi);
	  if (!targeted)
	    MAPSET(&solv->dupmap, pi);
	}
    }
  if (targeted && s->repo != installed && s->obsoletes)
    {
      /* XXX: check obsoletes/provides combination */
      obsp = s->repo->idarraydata + s->obsoletes;
      while ((obs = *obsp++) != 0)
	{
	  FOR_PROVIDES(pi, pip, obs)
	    {
	      Solvable *ps = pool->solvables + pi;
	      if (!pool->obsoleteusesprovides && !pool_match_nevr(pool, ps, obs))
		continue;
	      if (pool->obsoleteusescolors && !pool_colormatch(pool, s, ps))
		continue;
	      MAPSET(&solv->dupinvolvedmap, pi);
	      if (targeted && ps->repo == installed && solv->obsoletes && solv->obsoletes[pi - installed->start])
		{
		  Id *opp, pi2;
		  for (opp = solv->obsoletes_data + solv->obsoletes[pi - installed->start]; (pi2 = *opp++) != 0;)
		    if (pool->solvables[pi2].repo != installed)
		      MAPSET(&solv->dupinvolvedmap, pi2);
		}
	      if (ps->repo == installed && (how & SOLVER_FORCEBEST) != 0 && !solv->bestupdatemap_all)
		{
		  if (!solv->bestupdatemap.size)
		    map_grow(&solv->bestupdatemap, installed->end - installed->start);
		  MAPSET(&solv->bestupdatemap, pi - installed->start);
		}
	      if (ps->repo == installed && (how & SOLVER_CLEANDEPS) != 0)
		add_cleandeps_updatepkg(solv, pi);
	    }
	}
    }
}

/* create the two dupmaps:
 * - dupmap: packages in that map are good to install/keep
 * - dupinvolvedmap: packages are subject to dup mode
 */
void
solver_createdupmaps(Solver *solv)
{
  Pool *pool = solv->pool;
  Queue *job = &solv->job;
  Repo *installed = solv->installed;
  Id select, how, what, p, pp;
  Solvable *s;
  int i, targeted;

  map_init(&solv->dupmap, pool->nsolvables);
  solv->dupinvolvedmap_all = 0;
  map_init(&solv->dupinvolvedmap, 0);
  for (i = 0; i < job->count; i += 2)
    {
      how = job->elements[i];
      select = job->elements[i] & SOLVER_SELECTMASK;
      what = job->elements[i + 1];
      switch (how & SOLVER_JOBMASK)
	{
	case SOLVER_DISTUPGRADE:
	  if (select == SOLVER_SOLVABLE_REPO)
	    {
	      Repo *repo;
	      if (what <= 0 || what > pool->nrepos)
		break;
	      repo = pool_id2repo(pool, what);
	      if (!repo)
		break;
	      if (repo != installed && !(how & SOLVER_TARGETED) && solv->noautotarget)
		break;
	      targeted = repo != installed || (how & SOLVER_TARGETED) != 0;
	      FOR_REPO_SOLVABLES(repo, p, s)
		{
		  if (repo != installed && !pool_installable(pool, s))
		    continue;
		  solver_addtodupmaps(solv, p, how, targeted);
		}
	    }
	  else if (select == SOLVER_SOLVABLE_ALL)
	    {
	      solv->dupinvolvedmap_all = 1;
	      FOR_POOL_SOLVABLES(p)
		{
		  Solvable *s = pool->solvables + p;
		  if (!s->repo || s->repo == installed)
		    continue;
		  if (!pool_installable(pool, s))
		    continue;
		  MAPSET(&solv->dupmap, p);
		}
	      if ((how & SOLVER_FORCEBEST) != 0)
		solv->bestupdatemap_all = 1;
	      if ((how & SOLVER_CLEANDEPS) != 0 && installed)
		{
		  FOR_REPO_SOLVABLES(installed, p, s)
		    add_cleandeps_updatepkg(solv, p);
		}
	    }
	  else
	    {
	      targeted = how & SOLVER_TARGETED ? 1 : 0;
	      if (installed && !targeted && !solv->noautotarget)
		{
		  FOR_JOB_SELECT(p, pp, select, what)
		    if (pool->solvables[p].repo == installed)
		      break;
		  targeted = p == 0;
		}
	      else if (!installed && !solv->noautotarget)
		targeted = 1;
	      FOR_JOB_SELECT(p, pp, select, what)
		{
		  Solvable *s = pool->solvables + p;
		  if (!s->repo)
		    continue;
		  if (s->repo != installed && !targeted)
		    continue;
		  if (s->repo != installed && !pool_installable(pool, s))
		    continue;
		  solver_addtodupmaps(solv, p, how, targeted);
		}
	    }
	  break;
	default:
	  break;
	}
    }
  if (solv->dupinvolvedmap.size)
    MAPCLR(&solv->dupinvolvedmap, SYSTEMSOLVABLE);
  /* set update for all involved installed packages. We need to do
   * this before creating the update rules */
  if (solv->dupinvolvedmap_all)
    solv->updatemap_all = 1;
  else if (installed && !solv->updatemap_all && solv->dupinvolvedmap.size)
    {
      FOR_REPO_SOLVABLES(installed, p, s)
	{
	  if (!MAPTST(&solv->dupinvolvedmap, p))
	    continue;
	  if (!solv->updatemap.size)
	    map_grow(&solv->updatemap, installed->end - installed->start);
	  MAPSET(&solv->updatemap, p - installed->start);
	}
    }
}

void
solver_freedupmaps(Solver *solv)
{
  map_free(&solv->dupmap);
  /* we no longer free solv->dupinvolvedmap as we need it in
   * policy's priority pruning code. sigh. */
}

void
solver_addduprules(Solver *solv, Map *addedmap)
{
  Pool *pool = solv->pool;
  Repo *installed = solv->installed;
  Id p, pp;
  Solvable *s, *ps;
  int first, i;
  Rule *r;

  solv->duprules = solv->nrules;
  for (i = 1; i < pool->nsolvables; i++)
    {
      if (i == SYSTEMSOLVABLE || !MAPTST(addedmap, i))
	continue;
      s = pool->solvables + i;
      first = i;
      FOR_PROVIDES(p, pp, s->name)
	{
	  ps = pool->solvables + p;
	  if (ps->name != s->name || !MAPTST(addedmap, p))
	    continue;
	  if (p == i)
	    first = 0;
	  if (first)
	    break;
	  if (!solv->dupinvolvedmap_all && !MAPTST(&solv->dupinvolvedmap, p))
	    continue;
	  if (installed && ps->repo == installed)
	    {
	      if (pool->considered && pool_disabled_solvable(pool, ps))
		continue;		/* always keep disabled installed packages */
	      if (!MAPTST(&solv->dupmap, p))
		{
		  Id ip, ipp;
		  /* is installed identical to a good one? */
		  FOR_PROVIDES(ip, ipp, ps->name)
		    {
		      Solvable *is = pool->solvables + ip;
		      if (!MAPTST(&solv->dupmap, ip))
			continue;
		      if (is->evr == ps->evr && solvable_identical(ps, is))
			break;
		    }
		  if (ip)
		    {
		      /* ok, identical to a good one. we may keep this package. */
		      MAPSET(&solv->dupmap, p);		/* for best rules processing */
		      continue;
		    }
		  /* check if it's orphaned. If yes, we may keep it */
		  r = solv->rules + solv->updaterules + (p - installed->start);
		  if (!r->p)
		    r = solv->rules + solv->featurerules + (p - installed->start);
		  if (!r->p)
		    {
		      /* no update/feature rule, this is an orphan */
		      MAPSET(&solv->dupmap, p);		/* for best rules processing */
		      continue;
		    }
		  if (solv->specialupdaters && solv->specialupdaters[p - installed->start])
		    {
		      /* this is a multiversion orphan, we're good if an update is installed */
		      solver_addrule(solv, -p, 0, solv->specialupdaters[p - installed->start]);
		      continue;
		    }
		  if (r->p == p && !r->d && !r->w2)
		    {
		      r = solv->rules + solv->featurerules + (p - installed->start);
		      if (!r->p || (!r->d && !r->w2))
			{
			  /* this is an orphan */
			  MAPSET(&solv->dupmap, p);		/* for best rules processing */
			  continue;
			}
		    }
		  solver_addrule(solv, -p, 0, 0);	/* no match, sorry */
		}
	    }
	  else if (!MAPTST(&solv->dupmap, p))
	    solver_addrule(solv, -p, 0, 0);
	}
    }
  solv->duprules_end = solv->nrules;
}


static inline void
disableduprule(Solver *solv, Id name)
{
  Pool *pool = solv->pool;
  Rule *r;
  int i;
  for (i = solv->duprules, r = solv->rules + i; i < solv->duprules_end; i++, r++)
    {
      if (r->p < 0 && r->d >= 0 && pool->solvables[-r->p].name == name)
	solver_disablerule(solv, r);
    }
}

static inline void
reenableduprule(Solver *solv, Id name)
{
  Pool *pool = solv->pool;
  Rule *r;
  int i;
  for (i = solv->duprules, r = solv->rules + i; i < solv->duprules_end; i++, r++)
    {
      if (r->p < 0 && r->d < 0 && pool->solvables[-r->p].name == name)
	{
	  solver_enablerule(solv, r);
	  IF_POOLDEBUG (SOLV_DEBUG_SOLUTIONS)
	    {
	      POOL_DEBUG(SOLV_DEBUG_SOLUTIONS, "@@@ re-enabling ");
	      solver_printruleclass(solv, SOLV_DEBUG_SOLUTIONS, r);
	    }
	}
    }
}

/***********************************************************************
 ***
 ***  Black rule part
 ***/

static inline void
disableblackrule(Solver *solv, Id p)
{
  Rule *r;
  int i;
  for (i = solv->blackrules, r = solv->rules + i; i < solv->blackrules_end; i++, r++)
    if (r->p == -p)
      solver_disablerule(solv, r);
}

static inline void
reenableblackrule(Solver *solv, Id p)
{
  Pool *pool = solv->pool;
  Rule *r;
  int i;
  for (i = solv->blackrules, r = solv->rules + i; i < solv->blackrules_end; i++, r++)
    if (r->p == -p)
      {
	solver_enablerule(solv, r);
	IF_POOLDEBUG (SOLV_DEBUG_SOLUTIONS)
	  {
	    POOL_DEBUG(SOLV_DEBUG_SOLUTIONS, "@@@ re-enabling ");
	    solver_printruleclass(solv, SOLV_DEBUG_SOLUTIONS, r);
	  }
      }
}

void
solver_addblackrules(Solver *solv)
{
  Pool *pool = solv->pool;
  Repo *installed = solv->installed;
  Id how, select, what, p, pp;
  Queue *job = &solv->job;
  Map updatemap;
  int i;

  map_init(&updatemap, 0);
  solv->blackrules = solv->nrules;
  if (installed)
    {
      for (i = 0; i < job->count; i += 2)
	{
	  how = job->elements[i];
	  select = job->elements[i] & SOLVER_SELECTMASK;
	  what = job->elements[i + 1];
	  switch (how & SOLVER_JOBMASK)
	    {
	    case SOLVER_BLACKLIST:
	      FOR_JOB_SELECT(p, pp, select, what)
		{
		  Solvable *s = pool->solvables + p;
		  if (s->repo != installed)
		    continue;
		  if (!updatemap.size)
		    map_grow(&updatemap, pool->ss.nstrings);
		  if (s->name > 0 && s->name < pool->ss.nstrings)
		    MAPSET(&updatemap, s->name);
		}
	    }
	}
    }
  for (i = 0; i < job->count; i += 2)
    {
      how = job->elements[i];
      select = job->elements[i] & SOLVER_SELECTMASK;
      what = job->elements[i + 1];
      switch (how & SOLVER_JOBMASK)
	{
	case SOLVER_BLACKLIST:
	  FOR_JOB_SELECT(p, pp, select, what)
	    {
	      Solvable *s = pool->solvables + p;
	      if (s->repo == installed)
		continue;
	      if (updatemap.size && s->name > 0 && s->name < pool->ss.nstrings && MAPTST(&updatemap, s->name))
		continue;	/* installed package with same name is already blacklisted */
	      solver_addrule(solv, -p, 0, 0);
	    }
	  break;
	}
    }
  map_free(&updatemap);
  solv->blackrules_end = solv->nrules;
}

/***********************************************************************
 ***
 ***  Strict repo prio rule part
 ***/

/* add rules to exclude solvables provided by lower
 * precedence repositories */
void solver_addstrictrepopriorules(struct s_Solver *solv, Map *addedmap)
{
  Pool *pool = solv->pool;
  Solvable *s;
  Id p, p2, pp2;
  Map priomap;
  int max_prio;

  map_init_clone(&priomap, addedmap);
  solv->strictrepopriorules = solv->nrules;

  FOR_POOL_SOLVABLES(p)
  {
    if (!MAPTST(&priomap, p))
      continue;

    s = pool->solvables + p;
    max_prio = s->repo->priority;
    FOR_PROVIDES(p2, pp2, s->name)
      {
	Solvable *s2 = pool->solvables + p2;
	if (s->name != s2->name)
	  continue;
	if (s2->repo->priority > max_prio)
	  max_prio = s2->repo->priority;
      }
	  
    FOR_PROVIDES(p2, pp2, s->name)
      {
	Solvable *s2 = pool->solvables + p2;
	if (s->name != s2->name || !MAPTST(&priomap, p2))
	  continue;
	MAPCLR(&priomap, p2);
	if (pool->installed && s2->repo == pool->installed)
	  continue;
	if (s2->repo->priority < max_prio)
	  solver_addrule(solv, -p2, 0, 0);
      }
  }
  solv->strictrepopriorules_end = solv->nrules;
  map_free(&priomap);
}

static inline void
disablerepopriorule(Solver *solv, Id name)
{
  Pool *pool = solv->pool;
  Rule *r;
  int i;
  for (i = solv->strictrepopriorules, r = solv->rules + i; i < solv->strictrepopriorules_end; i++, r++)
    {
      if (r->p < 0 && r->d >= 0 && pool->solvables[-r->p].name == name)
	solver_disablerule(solv, r);
    }
}

static inline void
reenablerepopriorule(Solver *solv, Id name)
{
  Pool *pool = solv->pool;
  Rule *r;
  int i;
  for (i = solv->strictrepopriorules, r = solv->rules + i; i < solv->strictrepopriorules_end; i++, r++)
    {
      if (r->p < 0 && r->d < 0 && pool->solvables[-r->p].name == name)
	{
	  solver_enablerule(solv, r);
	  IF_POOLDEBUG (SOLV_DEBUG_SOLUTIONS)
	    {
	      POOL_DEBUG(SOLV_DEBUG_SOLUTIONS, "@@@ re-enabling ");
	      solver_printruleclass(solv, SOLV_DEBUG_SOLUTIONS, r);
	    }
	}
    }
}

/***********************************************************************
 ***
 ***  Policy rule disabling/reenabling
 ***
 ***  Disable all policy rules that conflict with our jobs. If a job
 ***  gets disabled later on, reenable the involved policy rules again.
 ***
 ***/

#define DISABLE_UPDATE	 1
#define DISABLE_INFARCH	 2
#define DISABLE_DUP	 3
#define DISABLE_BLACK	 4
#define DISABLE_REPOPRIO 5

/* check if installed package p is in lock-step with another installed package */
static int
installed_is_in_lockstep(Solver *solv, Id p)
{
  Pool *pool = solv->pool;
  Repo *installed = solv->installed;
  int rid;
  Id pp, l;
  Rule *r;

  if (!installed)
    return 0;
  for (rid = solv->infarchrules, r = solv->rules + rid; rid < solv->infarchrules_end; rid++, r++)
    {
      if (r->p >= 0)
	continue;
      if (pool->solvables[-r->p].repo != installed)
	continue;
      FOR_RULELITERALS(l, pp, r)
	if (l == p)
	  return 1;
    }
  return 0;
}

static void
jobtodisablelist(Solver *solv, Id how, Id what, Queue *q)
{
  Pool *pool = solv->pool;
  Id select, p, pp;
  Repo *installed;
  Solvable *s;
  int i, j, set, qstart;
  Map omap;

  installed = solv->installed;
  select = how & SOLVER_SELECTMASK;
  switch (how & SOLVER_JOBMASK)
    {
    case SOLVER_INSTALL:
      set = how & SOLVER_SETMASK;
      if (!(set & SOLVER_NOAUTOSET))
	{
	  /* automatically add set bits by analysing the job */
	  if (select == SOLVER_SOLVABLE_NAME)
	    set |= SOLVER_SETNAME;
	  if (select == SOLVER_SOLVABLE)
	    set |= SOLVER_SETNAME | SOLVER_SETARCH | SOLVER_SETVENDOR | SOLVER_SETREPO | SOLVER_SETEVR;
	  else if ((select == SOLVER_SOLVABLE_NAME || select == SOLVER_SOLVABLE_PROVIDES) && ISRELDEP(what))
	    {
	      Reldep *rd = GETRELDEP(pool, what);
	      if (rd->flags == REL_EQ && select == SOLVER_SOLVABLE_NAME)
		{
		  if (pool->disttype != DISTTYPE_DEB)
		    {
		      const char *rel = strrchr(pool_id2str(pool, rd->evr), '-');
		      set |= rel ? SOLVER_SETEVR : SOLVER_SETEV;
		    }
		  else
		    set |= SOLVER_SETEVR;
		}
	      if (rd->flags <= 7 && ISRELDEP(rd->name))
		rd = GETRELDEP(pool, rd->name);
	      if (rd->flags == REL_ARCH)
		set |= SOLVER_SETARCH;
	    }
	}
      else
	set &= ~SOLVER_NOAUTOSET;
      if (!set)
	return;
      if ((set & SOLVER_SETARCH) != 0 && solv->infarchrules != solv->infarchrules_end)
	{
	  if (select == SOLVER_SOLVABLE)
	    {
	      for (i = solv->infarchrules; i < solv->infarchrules_end; i++)
		if (solv->rules[i].p == -what)
		  break;
	      if (i < solv->infarchrules_end)
	        queue_push2(q, DISABLE_INFARCH, pool->solvables[what].name);
	    }
	  else
	    {
	      int qcnt = q->count;
	      /* does not work for SOLVER_SOLVABLE_ALL and SOLVER_SOLVABLE_REPO, but
		 they are not useful for SOLVER_INSTALL jobs anyway */
	      FOR_JOB_SELECT(p, pp, select, what)
		{
		  s = pool->solvables + p;
		  /* unify names */
		  for (i = qcnt; i < q->count; i += 2)
		    if (q->elements[i + 1] == s->name)
		      break;
		  if (i < q->count)
		    continue;		/* already have that DISABLE_INFARCH element */
		  for (i = solv->infarchrules; i < solv->infarchrules_end; i++)
		    if (solv->rules[i].p == -p)
		      break;
		  if (i < solv->infarchrules_end)
		    queue_push2(q, DISABLE_INFARCH, s->name);
		}
	    }
	}
      if ((set & SOLVER_SETREPO) != 0 && solv->duprules != solv->duprules_end)
	{
	  if (select == SOLVER_SOLVABLE)
	    queue_push2(q, DISABLE_DUP, pool->solvables[what].name);
	  else
	    {
	      int qcnt = q->count;
	      FOR_JOB_SELECT(p, pp, select, what)
		{
		  s = pool->solvables + p;
		  /* unify names */
		  for (i = qcnt; i < q->count; i += 2)
		    if (q->elements[i + 1] == s->name)
		      break;
		  if (i < q->count)
		    continue;
		  queue_push2(q, DISABLE_DUP, s->name);
		}
	    }
	}
      if ((set & SOLVER_SETREPO) != 0 && solv->strictrepopriorules != solv->strictrepopriorules_end)
	{
	  if (select == SOLVER_SOLVABLE)
	    queue_push2(q, DISABLE_REPOPRIO, pool->solvables[what].name);
	  else
	    {
	      int qcnt = q->count;
	      FOR_JOB_SELECT(p, pp, select, what)
		{
		  s = pool->solvables + p;
		  /* unify names */
		  for (i = qcnt; i < q->count; i += 2)
		    if (q->elements[i + 1] == s->name)
		      break;
		  if (i < q->count)
		    continue;
		  queue_push2(q, DISABLE_REPOPRIO, s->name);
		}
	    }
	}
      if ((set & SOLVER_SETEVR) != 0 && solv->blackrules != solv->blackrules_end)
        {
	  if (select == SOLVER_SOLVABLE)
	    queue_push2(q, DISABLE_BLACK, what);
	  else
	    {
	      FOR_JOB_SELECT(p, pp, select, what)
	        queue_push2(q, DISABLE_BLACK, p);
	    }
        }
      if (!installed || installed->end == installed->start)
	return;
      /* now the hard part: disable some update rules */

      /* if the job asks for a single solvable to stay, disable the update rule */
      if (select == SOLVER_SOLVABLE && pool->solvables[what].repo == installed && solv->bestrules_info)
        if ((set & (SOLVER_SETEVR | SOLVER_SETARCH | SOLVER_SETVENDOR)) == (SOLVER_SETEVR | SOLVER_SETARCH | SOLVER_SETVENDOR))
	  {
	    int ni = solv->bestrules_end - solv->bestrules;
	    for (i = solv->bestrules_up - solv->bestrules; i < ni; i++)
	      if (solv->bestrules_info[i] == what)
		{
	          queue_push2(q, DISABLE_UPDATE, what);		/* will also disable the best rule */
		  break;
		}
	    return;
	  }

      /* first check if we have installed or multiversion packages in the job */
      FOR_JOB_SELECT(p, pp, select, what)
	{
	  if (pool->solvables[p].repo == installed)
	    return;
	  if (solv->multiversion.size && MAPTST(&solv->multiversion, p) && !solv->keepexplicitobsoletes)
	    return;		/* will not obsolete anything, so just return */
	}
      omap.size = 0;
      qstart = q->count;
      FOR_JOB_SELECT(p, pp, select, what)
	{
	  solver_intersect_obsoleted(solv, p, q, qstart, &omap);
	  if (q->count == qstart)
	    break;
	}
      if (omap.size)
        map_free(&omap);

      if (qstart == q->count)
	return;		/* nothing to prune */

      /* convert result to (DISABLE_UPDATE, p) pairs */
      i = q->count;
      for (j = qstart; j < i; j++)
	queue_push(q, q->elements[j]);
      for (j = qstart; j < q->count; j += 2)
	{
	  q->elements[j] = DISABLE_UPDATE;
	  q->elements[j + 1] = q->elements[i++];
	}

      /* now that we know which installed packages are obsoleted check each of them */
      if ((set & (SOLVER_SETEVR | SOLVER_SETARCH | SOLVER_SETVENDOR)) == (SOLVER_SETEVR | SOLVER_SETARCH | SOLVER_SETVENDOR))
	return;		/* all is set, nothing to do */

      for (i = j = qstart; i < q->count; i += 2)
	{
	  Solvable *is = pool->solvables + q->elements[i + 1];
	  FOR_JOB_SELECT(p, pp, select, what)
	    {
	      int illegal = 0;
	      s = pool->solvables + p;
	      if ((set & SOLVER_SETEVR) != 0)
		illegal |= POLICY_ILLEGAL_DOWNGRADE;	/* ignore */
	      if ((set & SOLVER_SETNAME) != 0)
		illegal |= POLICY_ILLEGAL_NAMECHANGE;	/* ignore */
	      if ((set & SOLVER_SETARCH) != 0)
		illegal |= POLICY_ILLEGAL_ARCHCHANGE;	/* ignore */
	      if ((set & SOLVER_SETVENDOR) != 0)
		illegal |= POLICY_ILLEGAL_VENDORCHANGE;	/* ignore */
	      illegal = policy_is_illegal(solv, is, s, illegal);
	      if (illegal && illegal == POLICY_ILLEGAL_DOWNGRADE && (set & SOLVER_SETEV) != 0)
		{
		  /* it's ok if the EV is different */
		  if (pool_evrcmp(pool, is->evr, s->evr, EVRCMP_COMPARE_EVONLY) != 0)
		    illegal = 0;
		}
	      if (illegal)
		break;
	    }
	  if (!p)
	    {	
	      /* no package conflicts with the update rule */
	      /* thus keep the DISABLE_UPDATE */
	      q->elements[j + 1] = q->elements[i + 1];
	      j += 2;
	    }
	}
      queue_truncate(q, j);
      return;

    case SOLVER_ERASE:
      if (!installed)
	break;
      set = how & SOLVER_SETMASK;
      if (!(set & (SOLVER_NOAUTOSET | SOLVER_SETARCH)) && pool->implicitobsoleteusescolors && solv->infarchrules != solv->infarchrules_end)
	{
	  if (select == SOLVER_SOLVABLE)
	    set |= SOLVER_SETARCH;
	  else if ((select == SOLVER_SOLVABLE_NAME || select == SOLVER_SOLVABLE_PROVIDES) && ISRELDEP(what))
	    {
	      Reldep *rd = GETRELDEP(pool, what);
	      if (rd->flags <= 7 && ISRELDEP(rd->name))
		rd = GETRELDEP(pool, rd->name);
	      if (rd->flags == REL_ARCH)
		set |= SOLVER_SETARCH;
	    }
	}
      if (select == SOLVER_SOLVABLE_ALL || (select == SOLVER_SOLVABLE_REPO && what == installed->repoid))
	{
	  FOR_REPO_SOLVABLES(installed, p, s)
	    queue_push2(q, DISABLE_UPDATE, p);
	}
      FOR_JOB_SELECT(p, pp, select, what)
	if (pool->solvables[p].repo == installed)
	  {
	    queue_push2(q, DISABLE_UPDATE, p);
	    if ((set & SOLVER_SETARCH) != 0 && pool->implicitobsoleteusescolors && solv->infarchrules != solv->infarchrules_end)
	      if (installed_is_in_lockstep(solv, p))
	        queue_push2(q, DISABLE_INFARCH, pool->solvables[p].name);		/* allow to break the lock-step */
#ifdef ENABLE_LINKED_PKGS
	    if (solv->instbuddy && solv->instbuddy[p - installed->start] > 1)
	      queue_push2(q, DISABLE_UPDATE, solv->instbuddy[p - installed->start]);
#endif
	  }
      return;

    case SOLVER_LOCK:
      if (!installed)
	break;
      qstart = q->count;
      if (select == SOLVER_SOLVABLE_ALL || (select == SOLVER_SOLVABLE_REPO && what == installed->repoid))
	{
	  FOR_REPO_SOLVABLES(installed, p, s)
	    {
	      for (i = qstart; i < q->count; i += 2)
		if (q->elements[i] == DISABLE_DUP && q->elements[i + 1] == pool->solvables[p].name)
		  break;
	      if (i == q->count)
	        queue_push2(q, DISABLE_DUP, pool->solvables[p].name);
	    }
	}
      FOR_JOB_SELECT(p, pp, select, what)
	{
	  if (pool->solvables[p].repo != installed)
	    continue;
	  for (i = qstart; i < q->count; i += 2)
	    if (q->elements[i] == DISABLE_DUP && q->elements[i + 1] == pool->solvables[p].name)
	      break;
	  if (i == q->count)
	    queue_push2(q, DISABLE_DUP, pool->solvables[p].name);
	}
      break;

    default:
      return;
    }
}

/* disable all policy rules that are in conflict with our job list */
void
solver_disablepolicyrules(Solver *solv)
{
  Queue *job = &solv->job;
  int i, j;
  Queue allq;
  Rule *r;
  Id lastjob = -1;
  Id allqbuf[128];

  queue_init_buffer(&allq, allqbuf, sizeof(allqbuf)/sizeof(*allqbuf));

  for (i = solv->jobrules; i < solv->jobrules_end; i++)
    {
      r = solv->rules + i;
      if (r->d < 0)	/* disabled? */
	continue;
      j = solv->ruletojob.elements[i - solv->jobrules];
      if (j == lastjob)
	continue;
      lastjob = j;
      jobtodisablelist(solv, job->elements[j], job->elements[j + 1], &allq);
    }
  if (solv->cleandepsmap.size)
    {
      solver_createcleandepsmap(solv, &solv->cleandepsmap, 0);
      for (i = solv->installed->start; i < solv->installed->end; i++)
	if (MAPTST(&solv->cleandepsmap, i - solv->installed->start))
	  queue_push2(&allq, DISABLE_UPDATE, i);
    }
  MAPZERO(&solv->noupdate);
  for (i = 0; i < allq.count; i += 2)
    {
      Id type = allq.elements[i], arg = allq.elements[i + 1];
      switch(type)
	{
	case DISABLE_UPDATE:
	  disableupdaterule(solv, arg);
	  break;
	case DISABLE_INFARCH:
	  disableinfarchrule(solv, arg);
	  break;
	case DISABLE_DUP:
	  disableduprule(solv, arg);
	  break;
	case DISABLE_BLACK:
	  disableblackrule(solv, arg);
	  break;
	case DISABLE_REPOPRIO:
	  disablerepopriorule(solv, arg);
	  break;
	default:
	  break;
	}
    }
  queue_free(&allq);
}

/* we just disabled job #jobidx, now reenable all policy rules that were
 * disabled because of this job */
void
solver_reenablepolicyrules(Solver *solv, int jobidx)
{
  Queue *job = &solv->job;
  int i, j, k, ai;
  Queue q, allq;
  Rule *r;
  Id lastjob = -1;
  Id qbuf[32], allqbuf[32];

  queue_init_buffer(&q, qbuf, sizeof(qbuf)/sizeof(*qbuf));
  jobtodisablelist(solv, job->elements[jobidx - 1], job->elements[jobidx], &q);
  if (!q.count)
    {
      queue_free(&q);
      return;
    }
  /* now remove everything from q that is disabled by other jobs */

  /* first remove cleandeps packages, they count as DISABLE_UPDATE */
  if (solv->cleandepsmap.size)
    {
      solver_createcleandepsmap(solv, &solv->cleandepsmap, 0);
      for (j = k = 0; j < q.count; j += 2)
	{
	  if (q.elements[j] == DISABLE_UPDATE)
	    {
	      Id p = q.elements[j + 1];
	      if (p >= solv->installed->start && p < solv->installed->end && MAPTST(&solv->cleandepsmap, p - solv->installed->start))
		continue;	/* remove element from q */
	    }
	  q.elements[k++] = q.elements[j];
	  q.elements[k++] = q.elements[j + 1];
	}
      q.count = k;
      if (!q.count)
	{
	  queue_free(&q);
	  return;
	}
    }

  /* now go through the disable list of all other jobs */
  queue_init_buffer(&allq, allqbuf, sizeof(allqbuf)/sizeof(*allqbuf));
  for (i = solv->jobrules; i < solv->jobrules_end; i++)
    {
      r = solv->rules + i;
      if (r->d < 0)	/* disabled? */
	continue;
      j = solv->ruletojob.elements[i - solv->jobrules];
      if (j == lastjob)
	continue;
      lastjob = j;
      jobtodisablelist(solv, job->elements[j], job->elements[j + 1], &allq);
      if (!allq.count)
	continue;
      /* remove all elements in allq from q */
      for (j = k = 0; j < q.count; j += 2)
	{
	  Id type = q.elements[j], arg = q.elements[j + 1];
	  for (ai = 0; ai < allq.count; ai += 2)
	    if (allq.elements[ai] == type && allq.elements[ai + 1] == arg)
	      break;
	  if (ai < allq.count)
	    continue;	/* found it in allq, remove element from q */
	  q.elements[k++] = q.elements[j];
	  q.elements[k++] = q.elements[j + 1];
	}
      q.count = k;
      if (!q.count)
	{
	  queue_free(&q);
	  queue_free(&allq);
	  return;
	}
      queue_empty(&allq);
    }
  queue_free(&allq);

  /* now re-enable anything that's left in q */
  for (j = 0; j < q.count; j += 2)
    {
      Id type = q.elements[j], arg = q.elements[j + 1];
      switch(type)
	{
	case DISABLE_UPDATE:
	  reenableupdaterule(solv, arg);
	  break;
	case DISABLE_INFARCH:
	  reenableinfarchrule(solv, arg);
	  break;
	case DISABLE_DUP:
	  reenableduprule(solv, arg);
	  break;
	case DISABLE_BLACK:
	  reenableblackrule(solv, arg);
	  break;
	case DISABLE_REPOPRIO:
	  reenablerepopriorule(solv, arg);
	  break;
	}
    }
  queue_free(&q);
}

/* we just removed a package from the cleandeps map, now reenable all policy rules that were
 * disabled because of this */
void
solver_reenablepolicyrules_cleandeps(Solver *solv, Id pkg)
{
  Queue *job = &solv->job;
  int i, j;
  Queue allq;
  Rule *r;
  Id lastjob = -1;
  Id allqbuf[128];

  queue_init_buffer(&allq, allqbuf, sizeof(allqbuf)/sizeof(*allqbuf));
  for (i = solv->jobrules; i < solv->jobrules_end; i++)
    {
      r = solv->rules + i;
      if (r->d < 0)	/* disabled? */
	continue;
      j = solv->ruletojob.elements[i - solv->jobrules];
      if (j == lastjob)
	continue;
      lastjob = j;
      jobtodisablelist(solv, job->elements[j], job->elements[j + 1], &allq);
    }
  for (i = 0; i < allq.count; i += 2)
    if (allq.elements[i] == DISABLE_UPDATE && allq.elements[i + 1] == pkg)
      break;
  if (i == allq.count)
    reenableupdaterule(solv, pkg);
  queue_free(&allq);
}


/***********************************************************************
 ***
 ***  Rule info part, tell the user what the rule is about.
 ***
 ***/

static void
addpkgruleinfo(Solver *solv, Id p, Id p2, Id d, int type, Id dep)
{
  Pool *pool = solv->pool;
  Rule *r;

  if (d)
    {
      assert(!p2 && d > 0);
      if (!pool->whatprovidesdata[d])
	d = 0;
      else if (!pool->whatprovidesdata[d + 1])
	{
	  p2 = pool->whatprovidesdata[d];
	  d = 0;
	}
    }

  /* check if this creates the rule we're searching for */
  r = solv->rules + solv->ruleinfoq->elements[0];
  if (d)
    {
      /* three or more literals */
      Id od = r->d < 0 ? -r->d - 1 : r->d;
      if (p != r->p && !od)
	return;
      if (d != od)
	{
	  Id *dp = pool->whatprovidesdata + d;
	  Id *odp = pool->whatprovidesdata + od;
	  while (*dp)
	    if (*dp++ != *odp++)
	      return;
	  if (*odp)
	    return;
	}
      /* set p2 for multiversion conflicts */
      if (p < 0 && pool->whatprovidesdata[d] < 0 && pool->whatprovidesdata[d + 1] >= 0 && type == SOLVER_RULE_PKG_CONFLICTS)
	p2 = pool->whatprovidesdata[d];
    }
  else
    {
      /* one or two literals */
      Id op = p, op2 = p2;
      if (op2 && op > op2)	/* normalize */
	{
	  Id o = op;
	  op = op2;
	  op2 = o;
	}
      if (r->p != op || r->w2 != op2 || (r->d && r->d != -1))
	return;
      if (type == SOLVER_RULE_PKG_CONFLICTS && !p2)
	p2 = -SYSTEMSOLVABLE;
      if (type == SOLVER_RULE_PKG_SAME_NAME)
	{
	  p = op;	/* we normalize same name order */
	  p2 = op2;
	}
    }
  /* yep, rule matches. record info */
  queue_push(solv->ruleinfoq, type);
  queue_push(solv->ruleinfoq, p < 0 ? -p : 0);
  queue_push(solv->ruleinfoq, p2 < 0 ? -p2 : 0);
  queue_push(solv->ruleinfoq, dep);
}

static int
solver_allruleinfos_cmp(const void *ap, const void *bp, void *dp)
{
  const Id *a = ap, *b = bp;
  int r;

  r = a[0] - b[0];
  if (r)
    return r;
  r = a[1] - b[1];
  if (r)
    return r;
  r = a[2] - b[2];
  if (r)
    return r;
  r = a[3] - b[3];
  if (r)
    return r;
  return 0;
}

static void
getpkgruleinfos(Solver *solv, Rule *r, Queue *rq)
{
  Pool *pool = solv->pool;
  Id l, pp;
  if (r->p >= 0)
    return;
  queue_push(rq, r - solv->rules);	/* push the rule we're interested in */
  solv->ruleinfoq = rq;
  FOR_RULELITERALS(l, pp, r)
    {
      if (l >= 0)
	break;
      solver_addpkgrulesforsolvable(solv, pool->solvables - l, 0);
    }
#ifdef ENABLE_LINKED_PKGS
  FOR_RULELITERALS(l, pp, r)
    {
      if (l < 0)
	{
	  if (l == r->p)
	    continue;
	  break;
	}
      if (!strchr(pool_id2str(pool, pool->solvables[l].name), ':') || !has_package_link(pool, pool->solvables + l))
	break;
      add_package_link(solv, pool->solvables + l, 0, 0);
    }
#endif
  solv->ruleinfoq = 0;
  queue_shift(rq);
}

int
solver_allruleinfos(Solver *solv, Id rid, Queue *rq)
{
  Rule *r = solv->rules + rid;
  int i, j;

  queue_empty(rq);
  if (rid <= 0 || rid >= solv->pkgrules_end)
    {
      Id type, from, to, dep;
      type = solver_ruleinfo(solv, rid, &from, &to, &dep);
      queue_push(rq, type);
      queue_push(rq, from);
      queue_push(rq, to);
      queue_push(rq, dep);
      return 1;
    }
  getpkgruleinfos(solv, r, rq);
  /* now sort & unify em */
  if (!rq->count)
    return 0;
  solv_sort(rq->elements, rq->count / 4, 4 * sizeof(Id), solver_allruleinfos_cmp, 0);
  /* throw out identical entries */
  for (i = j = 0; i < rq->count; i += 4)
    {
      if (j)
	{
	  if (rq->elements[i] == rq->elements[j - 4] &&
	      rq->elements[i + 1] == rq->elements[j - 3] &&
	      rq->elements[i + 2] == rq->elements[j - 2] &&
	      rq->elements[i + 3] == rq->elements[j - 1])
	    continue;
	}
      rq->elements[j++] = rq->elements[i];
      rq->elements[j++] = rq->elements[i + 1];
      rq->elements[j++] = rq->elements[i + 2];
      rq->elements[j++] = rq->elements[i + 3];
    }
  rq->count = j;
  return j / 4;
}

SolverRuleinfo
solver_ruleinfo(Solver *solv, Id rid, Id *fromp, Id *top, Id *depp)
{
  Pool *pool = solv->pool;
  Rule *r = solv->rules + rid;
  SolverRuleinfo type = SOLVER_RULE_UNKNOWN;

  if (fromp)
    *fromp = 0;
  if (top)
    *top = 0;
  if (depp)
    *depp = 0;
  if (rid > 0 && rid < solv->pkgrules_end)
    {
      Queue rq;
      int i;

      if (r->p >= 0)
	return SOLVER_RULE_PKG;
      if (fromp)
	*fromp = -r->p;
      queue_init(&rq);
      getpkgruleinfos(solv, r, &rq);
      type = SOLVER_RULE_PKG;
      for (i = 0; i < rq.count; i += 4)
	{
	  Id qt, qo, qp, qd;
	  qt = rq.elements[i];
	  qp = rq.elements[i + 1];
	  qo = rq.elements[i + 2];
	  qd = rq.elements[i + 3];
	  if (type == SOLVER_RULE_PKG || qt == SOLVER_RULE_PKG_SAME_NAME || type > qt)
	    {
	      type = qt;
	      if (fromp)
		*fromp = qp;
	      if (top)
		*top = qo;
	      if (depp)
		*depp = qd;
	      if (qt == SOLVER_RULE_PKG_SAME_NAME)
		break;			/* prefer SOLVER_RULE_PKG_SAME_NAME */
	    }
	}
      queue_free(&rq);
      return type;
    }
  if (rid >= solv->jobrules && rid < solv->jobrules_end)
    {
      Id jidx = solv->ruletojob.elements[rid - solv->jobrules];
      if (fromp)
	*fromp = jidx;
      if (top)
	*top = solv->job.elements[jidx];
      if (depp)
	*depp = solv->job.elements[jidx + 1];
      if ((r->d == 0 || r->d == -1) && r->w2 == 0 && r->p == -SYSTEMSOLVABLE)
	{
	  Id how = solv->job.elements[jidx];
	  if ((how & (SOLVER_JOBMASK|SOLVER_SELECTMASK)) == (SOLVER_INSTALL|SOLVER_SOLVABLE_NAME))
	    return SOLVER_RULE_JOB_UNKNOWN_PACKAGE;
	  if ((how & (SOLVER_JOBMASK|SOLVER_SELECTMASK)) == (SOLVER_INSTALL|SOLVER_SOLVABLE_PROVIDES))
	    return SOLVER_RULE_JOB_NOTHING_PROVIDES_DEP;
	  if ((how & (SOLVER_JOBMASK|SOLVER_SELECTMASK)) == (SOLVER_ERASE|SOLVER_SOLVABLE_NAME))
	    return SOLVER_RULE_JOB_PROVIDED_BY_SYSTEM;
	  if ((how & (SOLVER_JOBMASK|SOLVER_SELECTMASK)) == (SOLVER_ERASE|SOLVER_SOLVABLE_PROVIDES))
	    return SOLVER_RULE_JOB_PROVIDED_BY_SYSTEM;
	  return SOLVER_RULE_JOB_UNSUPPORTED;
	}
      return SOLVER_RULE_JOB;
    }
  if (rid >= solv->updaterules && rid < solv->updaterules_end)
    {
      if (fromp)
	*fromp = solv->installed->start + (rid - solv->updaterules);
      return SOLVER_RULE_UPDATE;
    }
  if (rid >= solv->featurerules && rid < solv->featurerules_end)
    {
      if (fromp)
	*fromp = solv->installed->start + (rid - solv->featurerules);
      return SOLVER_RULE_FEATURE;
    }
  if (rid >= solv->duprules && rid < solv->duprules_end)
    {
      if (fromp)
	*fromp = -r->p;
      if (depp)
	*depp = pool->solvables[-r->p].name;
      return SOLVER_RULE_DISTUPGRADE;
    }
  if (rid >= solv->infarchrules && rid < solv->infarchrules_end)
    {
      if (fromp)
	*fromp = -r->p;
      if (depp)
	*depp = pool->solvables[-r->p].name;
      return SOLVER_RULE_INFARCH;
    }
  if (rid >= solv->bestrules && rid < solv->bestrules_end)
    {
      /* > 0: the package we are updating */
      if (fromp && solv->bestrules_info[rid - solv->bestrules] > 0)
	*fromp = solv->bestrules_info[rid - solv->bestrules];
      /* < 0: the job rule */
      if (top && solv->bestrules_info[rid - solv->bestrules] < 0)
	*top = -solv->bestrules_info[rid - solv->bestrules];
      return SOLVER_RULE_BEST;
    }
  if (rid >= solv->yumobsrules && rid < solv->yumobsrules_end)
    {
      if (fromp)
	*fromp = -r->p;
      if (top)
	{
	  /* first solvable is enough, we just need it for the name */
	  if (!r->d || r->d == -1)
	    *top = r->w2;
	  else
	    *top = pool->whatprovidesdata[r->d < 0 ? -r->d : r->d];
	}
      if (depp)
	*depp = solv->yumobsrules_info[rid - solv->yumobsrules];
      return SOLVER_RULE_YUMOBS;
    }
  if (rid >= solv->blackrules && rid < solv->blackrules_end)
    {
      if (fromp)
	*fromp = -r->p;
      return SOLVER_RULE_BLACK;
    }
  if (rid >= solv->strictrepopriorules && rid < solv->strictrepopriorules_end)
    {
      if (fromp)
	*fromp = -r->p;
      return SOLVER_RULE_STRICT_REPO_PRIORITY;
    }
  if (rid >= solv->choicerules && rid < solv->choicerules_end)
    {
      if (solv->choicerules_info && fromp)
	*fromp = solv->choicerules_info[rid - solv->choicerules];
      return SOLVER_RULE_CHOICE;
    }
  if (rid >= solv->recommendsrules && rid < solv->recommendsrules_end)
    {
      if (solv->recommendsrules_info && fromp)
	*fromp = solv->recommendsrules_info[rid - solv->recommendsrules];
      return SOLVER_RULE_RECOMMENDS;
    }
  if (rid >= solv->learntrules)
    return SOLVER_RULE_LEARNT;
  return SOLVER_RULE_UNKNOWN;
}

SolverRuleinfo
solver_ruleclass(Solver *solv, Id rid)
{
  if (rid <= 0)
    return SOLVER_RULE_UNKNOWN;
  if (rid > 0 && rid < solv->pkgrules_end)
    return SOLVER_RULE_PKG;
  if (rid >= solv->jobrules && rid < solv->jobrules_end)
    return SOLVER_RULE_JOB;
  if (rid >= solv->updaterules && rid < solv->updaterules_end)
    return SOLVER_RULE_UPDATE;
  if (rid >= solv->featurerules && rid < solv->featurerules_end)
    return SOLVER_RULE_FEATURE;
  if (rid >= solv->duprules && rid < solv->duprules_end)
    return SOLVER_RULE_DISTUPGRADE;
  if (rid >= solv->infarchrules && rid < solv->infarchrules_end)
    return SOLVER_RULE_INFARCH;
  if (rid >= solv->bestrules && rid < solv->bestrules_end)
    return SOLVER_RULE_BEST;
  if (rid >= solv->yumobsrules && rid < solv->yumobsrules_end)
    return SOLVER_RULE_YUMOBS;
  if (rid >= solv->blackrules && rid < solv->blackrules_end)
    return SOLVER_RULE_BLACK;
  if (rid >= solv->choicerules && rid < solv->choicerules_end)
    return SOLVER_RULE_CHOICE;
  if (rid >= solv->recommendsrules && rid < solv->recommendsrules_end)
    return SOLVER_RULE_RECOMMENDS;
  if (rid >= solv->strictrepopriorules && rid < solv->strictrepopriorules_end)
    return SOLVER_RULE_STRICT_REPO_PRIORITY;
  if (rid >= solv->learntrules && rid < solv->nrules)
    return SOLVER_RULE_LEARNT;
  return SOLVER_RULE_UNKNOWN;
}

void
solver_ruleliterals(Solver *solv, Id rid, Queue *q)
{
  Pool *pool = solv->pool;
  Id p, pp;
  Rule *r;

  queue_empty(q);
  r = solv->rules + rid;
  FOR_RULELITERALS(p, pp, r)
    if (p != -SYSTEMSOLVABLE)
      queue_push(q, p);
  if (!q->count)
    queue_push(q, -SYSTEMSOLVABLE);	/* hmm, better to return an empty result? */
}

int
solver_rule2jobidx(Solver *solv, Id rid)
{
  if (rid < solv->jobrules || rid >= solv->jobrules_end)
    return 0;
  return solv->ruletojob.elements[rid - solv->jobrules] + 1;
}

/* job rule introspection */
Id
solver_rule2job(Solver *solv, Id rid, Id *whatp)
{
  int idx;
  if (rid < solv->jobrules || rid >= solv->jobrules_end)
    {
      if (whatp)
	*whatp = 0;
      return 0;
    }
  idx = solv->ruletojob.elements[rid - solv->jobrules];
  if (whatp)
    *whatp = solv->job.elements[idx + 1];
  return solv->job.elements[idx];
}

/* update/feature rule introspection */
Id
solver_rule2solvable(Solver *solv, Id rid)
{
  if (rid >= solv->updaterules && rid < solv->updaterules_end && solv->installed)
    return solv->installed->start + (rid - solv->updaterules);
  if (rid >= solv->featurerules && rid < solv->featurerules_end && solv->installed)
    return solv->installed->start + (rid - solv->featurerules);
  return 0;
}

Id
solver_rule2pkgrule(Solver *solv, Id rid)
{
  if (rid >= solv->choicerules && rid < solv->choicerules_end)
    return solv->choicerules_info[rid - solv->choicerules];
  if (rid >= solv->recommendsrules && rid < solv->recommendsrules_end)
    return solv->recommendsrules_info[rid - solv->recommendsrules];
  return 0;
}

static void
solver_rule2rules_rec(Solver *solv, Id rid, Queue *q, Map *seen)
{
  int i;
  Id rid2;

  if (seen)
    MAPSET(seen, rid);
  for (i = solv->learnt_why.elements[rid - solv->learntrules]; (rid2 = solv->learnt_pool.elements[i]) != 0; i++)
    {
      if (seen)
	{
	  if (MAPTST(seen, rid2))
	    continue;
	  if (rid2 >= solv->learntrules)
	    solver_rule2rules_rec(solv, rid2, q, seen);
	  continue;
	}
      queue_push(q, rid2);
    }
}

/* learnt rule introspection */
void
solver_rule2rules(Solver *solv, Id rid, Queue *q, int recursive)
{
  queue_empty(q);
  if (rid < solv->learntrules || rid >= solv->nrules)
    return;
  if (recursive)
    {
      Map seen;
      map_init(&seen, solv->nrules);
      solver_rule2rules_rec(solv, rid, q, &seen);
      map_free(&seen);
    }
  else
    solver_rule2rules_rec(solv, rid, q, 0);
}


/* check if the newest versions of pi still provides the dependency we're looking for */
/* pi: installed package
 * r: rule for the dependency
 * m: map with all positive elements of r
 * return 0: at least one provider
 * return 1: the newest versions do not provide the dependency
 */
static int
solver_choicerulecheck(Solver *solv, Id pi, Rule *r, Map *m, Queue *q)
{
  Pool *pool = solv->pool;
  Rule *ur;
  Id p, pp;
  int i;

  if (!q->count || q->elements[0] != pi)
    {
      if (q->count)
        queue_empty(q);
      ur = solv->rules + solv->updaterules + (pi - pool->installed->start);
      if (!ur->p)
        ur = solv->rules + solv->featurerules + (pi - pool->installed->start);
      if (!ur->p)
	return 0;
      queue_push2(q, pi, 0);
      FOR_RULELITERALS(p, pp, ur)
	if (p > 0)
	  queue_push(q, p);
    }
  if (q->count == 2)
    return 1;
  if (q->count == 3)
    {
      p = q->elements[2];
      return MAPTST(m, p) ? 0 : 1;
    }
  if (!q->elements[1])
    {
      for (i = 2; i < q->count; i++)
	if (!MAPTST(m, q->elements[i]))
	  break;
      if (i == q->count)
	return 0;	/* all provide it, no need to filter */
      /* some don't provide it, have to filter */
      queue_deleten(q, 0, 2);
      policy_filter_unwanted(solv, q, POLICY_MODE_CHOOSE);
      queue_unshift(q, 1);	/* filter mark */
      queue_unshift(q, pi);
    }
  for (i = 2; i < q->count; i++)
    if (MAPTST(m, q->elements[i]))
      return 0;		/* at least one provides it */
  return 1;	/* none of the new packages provided it */
}

static Id
choicerule_find_installed(Pool *pool, Solvable *s)
{
  Id p2, pp2;

  FOR_PROVIDES(p2, pp2, s->name)
    {
      Solvable *s2 = pool->solvables + p2;
      if (s2->repo != pool->installed)
	continue;
      if (!pool->implicitobsoleteusesprovides && s->name != s2->name)
	continue;
      if (pool->implicitobsoleteusescolors && !pool_colormatch(pool, s, s2))
	continue;
      return p2;
    }
  if (s->obsoletes)
    {
      Id obs, *obsp = s->repo->idarraydata + s->obsoletes;
      while ((obs = *obsp++) != 0)
	{
	  FOR_PROVIDES(p2, pp2, obs)
	    {
	      Solvable *s2 = pool->solvables + p2;
	      if (s2->repo != pool->installed)
		continue;
	      if (!pool->obsoleteusesprovides && !pool_match_nevr(pool, pool->solvables + p2, obs))
		continue;
	      if (pool->obsoleteusescolors && !pool_colormatch(pool, s, s2))
		continue;
	      return p2;
	    }
	}
    }
  return 0;
}

void
solver_addchoicerules(Solver *solv)
{
  Pool *pool = solv->pool;
  Map m, mneg;
  Rule *r;
  Queue q, qi, qcheck, infoq;
  int i, j, rid, havechoice, negcnt;
  Id p, d, pp, p2;
  Solvable *s;
  Id lastaddedp, lastaddedd;
  int lastaddedcnt;
  unsigned int now;
  int isinstalled;
  int dodowngradecheck = solv->allowdowngrade;

  solv->choicerules = solv->nrules;
  if (!pool->installed)
    {
      solv->choicerules_end = solv->nrules;
      return;
    }
  now = solv_timems(0);
  if ((solv->dupinvolvedmap_all || solv->dupinvolvedmap.size) && solv->dup_allowdowngrade)
    dodowngradecheck = 1;
  queue_init(&q);
  queue_init(&qi);
  queue_init(&qcheck);
  queue_init(&infoq);
  map_init(&m, pool->nsolvables);
  map_init(&mneg, pool->nsolvables);
  /* set up negative assertion map from infarch and dup rules */
  for (rid = solv->infarchrules, r = solv->rules + rid; rid < solv->infarchrules_end; rid++, r++)
    if (r->p < 0 && !r->w2 && (r->d == 0 || r->d == -1))
      MAPSET(&mneg, -r->p);
  for (rid = solv->duprules, r = solv->rules + rid; rid < solv->duprules_end; rid++, r++)
    if (r->p < 0 && !r->w2 && (r->d == 0 || r->d == -1))
      MAPSET(&mneg, -r->p);
  lastaddedp = 0;
  lastaddedd = 0;
  lastaddedcnt = 0;
  for (rid = 1; rid < solv->pkgrules_end ; rid++)
    {
      r = solv->rules + rid;
      if (r->p >= 0 || ((r->d == 0 || r->d == -1) && r->w2 <= 0))
	continue;	/* only look at requires rules */
      /* solver_printrule(solv, SOLV_DEBUG_RESULT, r); */
      queue_empty(&qi);
      havechoice = 0;
      isinstalled = 0;
      Id name = 0;
      FOR_RULELITERALS(p, pp, r)
	{
	  if (p < 0)
	    {
	      Solvable *s = pool->solvables - p;
	      p2 = s->repo == pool->installed ? -p : 0;
	      if (p2)
		{
		  if (!(solv->updatemap_all || (solv->updatemap.size && MAPTST(&solv->updatemap, p2 - solv->installed->start))))
		    isinstalled = 1;
		}
	      continue;
	    }
	  s = pool->solvables + p;
	  if (!s->repo)
	    continue;
	  if (s->repo == pool->installed)
	    {
	      queue_push2(&qi, p, p);
	      continue;
	    }
	  /* find an installed package p2 that we can update/downgrade to p */
	  if (name != s->name)
	    {
	      p2 = choicerule_find_installed(pool, s);
	      name = s->name;
	    }
	  if (p2)
	    {
	      if (MAPTST(&mneg, p))
		continue;
	      if (policy_is_illegal(solv, pool->solvables + p2, s, 0))
		continue;
	      queue_push2(&qi, p2, p);
	      continue;
	    }
	  /* package p is independent of the installed ones */
	  havechoice = 1;
	}
#if 0
      printf("havechoice: %d qcount %d qicount %d\n", havechoice, q.count, qi.count);
#endif
      if (!havechoice || !qi.count)
	continue;	/* no choice */

      FOR_RULELITERALS(p, pp, r)
        if (p > 0)
	  MAPSET(&m, p);

      if (!isinstalled)
	{
	  /* do extra checking for packages related to installed packages */
	  for (i = j = 0; i < qi.count; i += 2)
	    {
	      int isdowngrade = 0;
	      p2 = qi.elements[i];
	      if (dodowngradecheck)
		{
		  p = qi.elements[i + 1];
		  if (pool->solvables[p2].name == pool->solvables[p].name)
		    if (pool_evrcmp(pool, pool->solvables[p2].evr, pool->solvables[p].evr, EVRCMP_COMPARE) > 0)
		      isdowngrade = 1;
		}
	      if (isdowngrade || solv->updatemap_all || (solv->updatemap.size && MAPTST(&solv->updatemap, p2 - solv->installed->start)))
		{
		  if (solver_choicerulecheck(solv, p2, r, &m, &qcheck))
		    continue;
		}
	      qi.elements[j++] = p2;
	      qi.elements[j++] = qi.elements[i + 1];
	    }
	  queue_truncate(&qi, j);
	}

      if (!qi.count)
	{
	  FOR_RULELITERALS(p, pp, r)
	    if (p > 0)
	      MAPCLR(&m, p);
	  continue;
	}

      queue_empty(&q);
      /* split q from qi */
      for (i = j = 0; i < qi.count; i += 2)
	{
	  queue_push(&q, qi.elements[i + 1]);
	  qi.elements[j++] = qi.elements[i];
	}
      queue_truncate(&qi, j);


      /* now check the update rules of the installed package.
       * if all packages of the update rules are contained in
       * the dependency rules, there's no need to set up the choice rule */
      for (i = 0; i < qi.count; i++)
	{
	  Rule *ur;
	  if (!qi.elements[i])
	    continue;
	  ur = solv->rules + solv->updaterules + (qi.elements[i] - pool->installed->start);
	  if (!ur->p)
	    ur = solv->rules + solv->featurerules + (qi.elements[i] - pool->installed->start);
	  if (!ur->p)
	    continue;
	  FOR_RULELITERALS(p, pp, ur)
	    if (!MAPTST(&m, p))
	      break;
	  if (p)
	    break;
	  /* speed improvement: only check each package once */
	  for (j = i + 1; j < qi.count; j++)
	    if (qi.elements[i] == qi.elements[j])
	      qi.elements[j] = 0;
	}
      /* empty map again */
      negcnt = 0;
      FOR_RULELITERALS(p, pp, r)
        if (p > 0)
	  MAPCLR(&m, p);
	else
	  negcnt++;
      if (i == qi.count)
	{
#if 0
	  printf("skipping choice ");
	  solver_printrule(solv, SOLV_DEBUG_RESULT, solv->rules + rid);
#endif
	  continue;
	}
      /* add neg elements to the front */
      if (negcnt > 1)
	{
	  i = 0;
	  FOR_RULELITERALS(p, pp, r)
	   if (p < 0 && p != r->p)
	     queue_insert(&q, i++, p);
	}
      /* don't add identical rules */
      if (lastaddedp == r->p && lastaddedcnt == q.count)
	{
	  for (i = 0; i < q.count; i++)
	    if (q.elements[i] != pool->whatprovidesdata[lastaddedd + i])
	      break;
	  if (i == q.count)
	    continue;	/* already added that one */
	}
      d = q.count ? pool_queuetowhatprovides(pool, &q) : 0;

      lastaddedp = r->p;
      lastaddedd = d;
      lastaddedcnt = q.count;

      solver_addrule(solv, r->p, 0, d);
      queue_push(&solv->weakruleq, solv->nrules - 1);
      queue_push(&infoq, rid);
#if 0
      printf("OLD ");
      solver_printrule(solv, SOLV_DEBUG_RESULT, solv->rules + rid);
      printf("WEAK CHOICE ");
      solver_printrule(solv, SOLV_DEBUG_RESULT, solv->rules + solv->nrules - 1);
#endif
    }
  if (infoq.count)
    solv->choicerules_info = solv_memdup2(infoq.elements, infoq.count, sizeof(Id));
  queue_free(&q);
  queue_free(&qi);
  queue_free(&qcheck);
  queue_free(&infoq);
  map_free(&m);
  map_free(&mneg);
  solv->choicerules_end = solv->nrules;
  POOL_DEBUG(SOLV_DEBUG_STATS, "choice rule creation took %d ms\n", solv_timems(now));
}

/* called when a choice rule needs to be disabled by analyze_unsolvable.
 * We also have to disable all other choice rules so that the best packages
 * get picked */
void
solver_disablechoicerules(Solver *solv, Rule *r)
{
  Id rid, p, pp;
  Pool *pool = solv->pool;
  Map m;
  Rule *or;

  solver_disablerule(solv, r);
  or = solv->rules + solv->choicerules_info[(r - solv->rules) - solv->choicerules];
  map_init(&m, pool->nsolvables);
  FOR_RULELITERALS(p, pp, or)
    if (p > 0)
      MAPSET(&m, p);
  FOR_RULELITERALS(p, pp, r)
    if (p > 0)
      MAPCLR(&m, p);
  for (rid = solv->choicerules; rid < solv->choicerules_end; rid++)
    {
      r = solv->rules + rid;
      if (r->d < 0)
	continue;
      or = solv->rules + solv->choicerules_info[rid - solv->choicerules];
      FOR_RULELITERALS(p, pp, or)
        if (p > 0 && MAPTST(&m, p))
	  break;
      if (p)
	solver_disablerule(solv, r);
    }
  map_free(&m);
}

static void
prune_to_update_targets(Solver *solv, Id *cp, Queue *q)
{
  int i, j;
  Id p, *cp2;
  for (i = j = 0; i < q->count; i++)
    {
      p = q->elements[i];
      for (cp2 = cp; *cp2; cp2++)
        if (*cp2 == p)
          {
            q->elements[j++] = p;
            break;
          }
    }
  queue_truncate(q, j);
}

static void
prune_to_dup_packages(Solver *solv, Id p, Queue *q)
{
  int i, j;
  for (i = j = 0; i < q->count; i++)
    {
      Id p = q->elements[i];
      if (MAPTST(&solv->dupmap, p))
	q->elements[j++] = p;
    }
  queue_truncate(q, j);
}

static void
prune_best_update(Solver *solv, Id p, Queue *q)
{
  if (solv->update_targets && solv->update_targets->elements[p - solv->installed->start])
    prune_to_update_targets(solv, solv->update_targets->elements + solv->update_targets->elements[p - solv->installed->start], q);
  if (solv->dupinvolvedmap.size && MAPTST(&solv->dupinvolvedmap, p))
    prune_to_dup_packages(solv, p, q);
  /* select best packages, just look at prio and version */
  policy_filter_unwanted(solv, q, POLICY_MODE_RECOMMEND);
}

static void
prune_disabled(Pool *pool, Queue *q)
{
  int i, j;
  for (i = j = 0; i < q->count; i++)
    {
      Id p = q->elements[i];
      Solvable *s = pool->solvables + p;
      if (s->repo && s->repo != pool->installed && !MAPTST(pool->considered, p))
	continue;
      q->elements[j++] = p;
    }
  queue_truncate(q, j);
}

void
solver_addbestrules(Solver *solv, int havebestinstalljobs, int haslockjob)
{
  Pool *pool = solv->pool;
  Id p;
  Solvable *s;
  Repo *installed = solv->installed;
  Queue q, q2;
  Rule *r;
  Queue infoq;
  int i, oldcnt;
  Map *lockedmap = 0;

  solv->bestrules = solv->nrules;
  queue_init(&q);
  queue_init(&q2);
  queue_init(&infoq);

  if (haslockjob)
    {
      int i;
      lockedmap = solv_calloc(1, sizeof(Map));
      map_init(lockedmap, pool->nsolvables);
      for (i = 0, r = solv->rules + solv->jobrules; i < solv->ruletojob.count; i++, r++)
	{
	  if (r->w2 || (solv->job.elements[solv->ruletojob.elements[i]] & SOLVER_JOBMASK) != SOLVER_LOCK)
	    continue;
	  p = r->p > 0 ? r->p : -r->p;
	  MAPSET(lockedmap, p);
	}
    }
  if (havebestinstalljobs)
    {
      for (i = 0; i < solv->job.count; i += 2)
	{
	  Id how = solv->job.elements[i];
	  if ((how & (SOLVER_JOBMASK | SOLVER_FORCEBEST)) == (SOLVER_INSTALL | SOLVER_FORCEBEST))
	    {
	      int j, k;
	      Id p2, pp2;
	      for (j = 0; j < solv->ruletojob.count; j++)
		{
		  if (solv->ruletojob.elements[j] != i)
		    continue;
		  r = solv->rules + solv->jobrules + j;
		  queue_empty(&q);
		  queue_empty(&q2);
		  FOR_RULELITERALS(p2, pp2, r)
		    {
		      if (p2 > 0)
		        queue_push(&q, p2);
		      else if (p2 < 0)
		        queue_push(&q2, p2);
		    }
		  if (pool->considered && pool->whatprovideswithdisabled)
		    prune_disabled(pool, &q);
		  if (!q.count)
		    continue;	/* orphaned */
		  /* select best packages, just look at prio and version */
		  oldcnt = q.count;
		  policy_filter_unwanted(solv, &q, POLICY_MODE_RECOMMEND);
		  if (q.count == oldcnt)
		    continue;	/* nothing filtered */
		  if (lockedmap)
		    {
		      queue_insertn(&q, 0, q2.count, q2.elements);
		      queue_empty(&q2);
		      FOR_RULELITERALS(p2, pp2, r)
			{
			  if (p2 <= 0)
			    continue;
			  if (installed && pool->solvables[p2].repo == installed)
			    {
			      if (MAPTST(lockedmap, p2))
			        queue_pushunique(&q, p2);		/* we always want that package */
			    }
			  else if (MAPTST(lockedmap, p2))
			    continue;
			  queue_push(&q2, p2);
			}
		      if (pool->considered && pool->whatprovideswithdisabled)
			prune_disabled(pool, &q2);
		      policy_filter_unwanted(solv, &q2, POLICY_MODE_RECOMMEND);
		      for (k = 0; k < q2.count; k++)
			queue_pushunique(&q, q2.elements[k]);
		      queue_empty(&q2);
		    }
		  if (q2.count)
		    queue_insertn(&q, 0, q2.count, q2.elements);
		  p2 = queue_shift(&q);
		  if (q.count < 2)
		    solver_addrule(solv, p2, q.count ? q.elements[0] : 0, 0);
		  else
		    solver_addrule(solv, p2, 0, pool_queuetowhatprovides(pool, &q));
		  if ((how & SOLVER_WEAK) != 0)
		    queue_push(&solv->weakruleq, solv->nrules - 1);
		  queue_push(&infoq, -(solv->jobrules + j));
		}
	    }
	}
    }
  solv->bestrules_up = solv->nrules;

  if (installed && (solv->bestupdatemap_all || solv->bestupdatemap.size))
    {
      Map m;

      if (solv->allowuninstall || solv->allowuninstall_all || solv->allowuninstallmap.size)
	map_init(&m, pool->nsolvables);
      else
	map_init(&m, 0);
      FOR_REPO_SOLVABLES(installed, p, s)
	{
	  Id d, p2, pp2;
	  if (!solv->updatemap_all && (!solv->updatemap.size || !MAPTST(&solv->updatemap, p - installed->start)))
	    continue;
	  if (!solv->bestupdatemap_all && (!solv->bestupdatemap.size || !MAPTST(&solv->bestupdatemap, p - installed->start)))
	    continue;
	  queue_empty(&q);
	  if (solv->bestobeypolicy)
	    r = solv->rules + solv->updaterules + (p - installed->start);
	  else
	    {
	      r = solv->rules + solv->featurerules + (p - installed->start);
	      if (!r->p)	/* identical to update rule? */
		r = solv->rules + solv->updaterules + (p - installed->start);
	    }
	  if (solv->specialupdaters && (d = solv->specialupdaters[p - installed->start]) != 0 && r == solv->rules + solv->updaterules + (p - installed->start))
	    {
	      /* need to check specialupdaters */
	      if (r->p == p)	/* be careful with the dup case */
		queue_push(&q, p);
	      while ((p2 = pool->whatprovidesdata[d++]) != 0)
		queue_push(&q, p2);
	    }
	  else
	    {
	      FOR_RULELITERALS(p2, pp2, r)
		if (p2 > 0)
		  queue_push(&q, p2);
	    }
	  if (lockedmap)
	    {
	      queue_empty(&q2);
	      queue_insertn(&q2, 0, q.count, q.elements);
	    }
	  prune_best_update(solv, p, &q);
	  if (!q.count)
	    continue;	/* orphaned */
	  if (lockedmap)
	    {
	      int j;
	      /* always ok to keep installed locked packages */
	      if (MAPTST(lockedmap, p))
		queue_pushunique(&q2, p);
	      for (j = 0; j < q2.count; j++)
		{
		  Id p2 = q2.elements[j];
		  if (pool->solvables[p2].repo == installed && MAPTST(lockedmap, p2))
		    queue_pushunique(&q, p2);
		}
	      /* filter out locked packages */
	      for (i = j = 0; j < q2.count; j++)
		{
		  Id p2 = q2.elements[j];
		  if (pool->solvables[p2].repo == installed || !MAPTST(lockedmap, p2))
		    q2.elements[i++] = p2;
		}
	      queue_truncate(&q2, i);
	      prune_best_update(solv, p, &q2);
	      for (j = 0; j < q2.count; j++)
		queue_pushunique(&q, q2.elements[j]);
	    }
	  if (solv->bestobeypolicy)
	    {
	      /* also filter the best of the feature rule packages and add them */
	      r = solv->rules + solv->featurerules + (p - installed->start);
	      if (r->p)
		{
		  int j;
		  queue_empty(&q2);
		  FOR_RULELITERALS(p2, pp2, r)
		    if (p2 > 0)
		      queue_push(&q2, p2);
		  prune_best_update(solv, p, &q2);
		  for (j = 0; j < q2.count; j++)
		    queue_pushunique(&q, q2.elements[j]);
		  if (lockedmap)
		    {
		      queue_empty(&q2);
		      FOR_RULELITERALS(p2, pp2, r)
			if (p2 > 0)
			  if (pool->solvables[p2].repo == installed || !MAPTST(lockedmap, p2))
			    queue_push(&q2, p2);
		      prune_best_update(solv, p, &q2);
		      for (j = 0; j < q2.count; j++)
			queue_pushunique(&q, q2.elements[j]);
		    }
		}
	    }
	  if (solv->allowuninstall || solv->allowuninstall_all || (solv->allowuninstallmap.size && MAPTST(&solv->allowuninstallmap, p - installed->start)))
	    {
	      /* package is flagged both for allowuninstall and best, add negative rules */
	      d = q.count == 1 ? q.elements[0] : -pool_queuetowhatprovides(pool, &q);
	      for (i = 0; i < q.count; i++)
		MAPSET(&m, q.elements[i]);
	      r = solv->rules + solv->featurerules + (p - installed->start);
	      if (!r->p)	/* identical to update rule? */
		r = solv->rules + solv->updaterules + (p - installed->start);
	      FOR_RULELITERALS(p2, pp2, r)
		{
		  if (MAPTST(&m, p2))
		    continue;
		  if (d >= 0)
		    solver_addrule(solv, -p2, d, 0);
		  else
		    solver_addrule(solv, -p2, 0, -d);
		  queue_push(&infoq, p);
		}
	      for (i = 0; i < q.count; i++)
		MAPCLR(&m, q.elements[i]);
	      continue;
	    }
	  p2 = queue_shift(&q);
	  if (q.count < 2)
	    solver_addrule(solv, p2, q.count ? q.elements[0] : 0, 0);
	  else
	    solver_addrule(solv, p2, 0, pool_queuetowhatprovides(pool, &q));
	  queue_push(&infoq, p);
	}
      map_free(&m);
    }
  if (infoq.count)
    solv->bestrules_info = solv_memdup2(infoq.elements, infoq.count, sizeof(Id));
  solv->bestrules_end = solv->nrules;
  queue_free(&q);
  queue_free(&q2);
  queue_free(&infoq);
  if (lockedmap)
    {
      map_free(lockedmap);
      solv_free(lockedmap);
    }
}




/* yumobs rule handling */
/* note that we use pool->obsoleteusescolors || pool->implicitobsoleteusescolors
 * like in policy_findupdatepackages */

static void
find_obsolete_group(Solver *solv, Id obs, Queue *q)
{
  Pool *pool = solv->pool;
  Queue qn;
  Id p2, pp2, op, *opp, opp2;
  int i, j, qnc, ncnt;

  queue_empty(q);
  FOR_PROVIDES(p2, pp2, obs)
    {
      Solvable *s2 = pool->solvables + p2;
      if (s2->repo != pool->installed)
	continue;
      if (!pool->obsoleteusesprovides && !pool_match_nevr(pool, pool->solvables + p2, obs))
	continue;
      /* we obsolete installed package s2 with obs. now find all other packages that have the same dep  */
      for (opp = solv->obsoletes_data + solv->obsoletes[p2 - solv->installed->start]; (op = *opp++) != 0;)
	{
	  Solvable *os = pool->solvables + op;
	  Id obs2, *obsp2;
	  if (!os->obsoletes)
	    continue;
	  if ((pool->obsoleteusescolors || pool->implicitobsoleteusescolors) && !pool_colormatch(pool, s2, os))
	    continue;
	  obsp2 = os->repo->idarraydata + os->obsoletes;
	  while ((obs2 = *obsp2++) != 0)
	    if (obs2 == obs)
	      break;
	  if (obs2)
	    queue_pushunique(q, op);
	}
      /* also search packages with the same name */
      FOR_PROVIDES(op, opp2, s2->name)
	{
	  Solvable *os = pool->solvables + op;
	  Id obs2, *obsp2;
	  if (os->name != s2->name)
	    continue;
	  if (!os->obsoletes)
	    continue;
	  if ((pool->obsoleteusescolors || pool->implicitobsoleteusescolors) && !pool_colormatch(pool, s2, os))
	    continue;
	  obsp2 = os->repo->idarraydata + os->obsoletes;
	  while ((obs2 = *obsp2++) != 0)
	    if (obs2 == obs)
	      break;
	  if (obs2)
	    queue_pushunique(q, op);
	}
    }
  /* find names so that we can build groups */
  queue_init_clone(&qn, q);
  prune_to_best_version(pool, &qn);
#if 0
{
  for (i = 0; i < qn.count; i++)
    printf(" + %s\n", pool_solvid2str(pool, qn.elements[i]));
}
#endif
  /* filter into name groups */
  qnc = qn.count;
  if (qnc == 1)
    {
      queue_free(&qn);
      queue_empty(q);
      return;
    }
  ncnt = 0;
  for (i = 0; i < qnc; i++)
    {
      Id n = pool->solvables[qn.elements[i]].name;
      int got = 0;
      for (j = 0; j < q->count; j++)
	{
	  Id p = q->elements[j];
	  if (pool->solvables[p].name == n)
	    {
	      queue_push(&qn, p);
	      got = 1;
	    }
	}
      if (got)
	{
	  queue_push(&qn, 0);
	  ncnt++;
	}
    }
  if (ncnt <= 1)
    {
      queue_empty(q);
    }
  else
    {
      queue_empty(q);
      queue_insertn(q, 0, qn.count - qnc, qn.elements + qnc);
    }
  queue_free(&qn);
}

void
solver_addyumobsrules(Solver *solv)
{
  Pool *pool = solv->pool;
  Repo *installed = solv->installed;
  Id p, op, *opp;
  Solvable *s;
  Queue qo, qq, infoq;
  int i, j, k;
  unsigned int now;

  solv->yumobsrules = solv->nrules;
  if (!installed || !solv->obsoletes)
    {
      solv->yumobsrules_end = solv->nrules;
      return;
    }
  now = solv_timems(0);
  queue_init(&qo);
  FOR_REPO_SOLVABLES(installed, p, s)
    {
      if (!solv->obsoletes[p - installed->start])
	continue;
#if 0
printf("checking yumobs for %s\n", pool_solvable2str(pool, s));
#endif
      for (opp = solv->obsoletes_data + solv->obsoletes[p - installed->start]; (op = *opp++) != 0;)
	{
	  Solvable *os = pool->solvables + op;
          Id obs, *obsp = os->repo->idarraydata + os->obsoletes;
	  Id p2, pp2;
	  while ((obs = *obsp++) != 0)
	    {
	      FOR_PROVIDES(p2, pp2, obs)
		{
		  Solvable *s2 = pool->solvables + p2;
		  if (s2->repo != installed)
		    continue;
		  if (!pool->obsoleteusesprovides && !pool_match_nevr(pool, pool->solvables + p2, obs))
		    continue;
		  if ((pool->obsoleteusescolors || pool->implicitobsoleteusescolors) && !pool_colormatch(pool, s, s2))
		    continue;
		  queue_pushunique(&qo, obs);
		  break;
		}
	    }
	}
    }
  if (!qo.count)
    {
      queue_free(&qo);
      return;
    }
  queue_init(&infoq);
  queue_init(&qq);
  for (i = 0; i < qo.count; i++)
    {
      int group, groupk, groupstart;
      queue_empty(&qq);
#if 0
printf("investigating %s\n", pool_dep2str(pool, qo.elements[i]));
#endif
      find_obsolete_group(solv, qo.elements[i], &qq);
#if 0
printf("result:\n");
for (j = 0; j < qq.count; j++)
  if (qq.elements[j] == 0)
    printf("---\n");
  else
    printf("%s\n", pool_solvid2str(pool, qq.elements[j]));
#endif

      if (!qq.count)
	continue;
      /* at least two groups, build rules */
      group = 0;
      for (j = 0; j < qq.count; j++)
	{
	  p = qq.elements[j];
	  if (!p)
	    {
	      group++;
	      continue;
	    }
	  if (pool->solvables[p].repo == installed)
	    continue;
	  groupk = 0;
	  groupstart = 0;
	  for (k = 0; k < qq.count; k++)
	    {
	      Id pk = qq.elements[k];
	      if (pk)
		continue;
	      if (group != groupk && k > groupstart)
		{
		  /* add the rule */
		  if (k - groupstart == 1)
		    solver_addrule(solv, -p, qq.elements[groupstart], 0);
		  else
		    solver_addrule(solv, -p, 0, pool_ids2whatprovides(pool, qq.elements + groupstart, k - groupstart));
		  queue_push(&infoq, qo.elements[i]);
		}
	      groupstart = k + 1;
	      groupk++;
	    }
	}
    }
  if (infoq.count)
    solv->yumobsrules_info = solv_memdup2(infoq.elements, infoq.count, sizeof(Id));
  queue_free(&infoq);
  queue_free(&qq);
  queue_free(&qo);
  solv->yumobsrules_end = solv->nrules;
  POOL_DEBUG(SOLV_DEBUG_STATS, "yumobs rule creation took %d ms\n", solv_timems(now));
}

/* recommendsrules are a copy of some recommends package rule but
 * with some disfavored literals removed */
void
solver_addrecommendsrules(Solver *solv)
{
  Pool *pool = solv->pool;
  int i, havedis, havepos;
  Id p, pp;
  Queue q, infoq;

  solv->recommendsrules = solv->nrules;
  queue_init(&q);
  queue_init(&infoq);
  for (i = 0; i < solv->recommendsruleq->count; i++)
    {
      int rid = solv->recommendsruleq->elements[i];
      Rule *r = solv->rules + rid;
      queue_empty(&q);
      havedis = havepos = 0;
      FOR_RULELITERALS(p, pp, r)
	{
	  if (p > 0 && solv->favormap[p] < 0)
	    havedis = 1;
	  else
	    {
	      if (p > 0)
		havepos = 1;
	      queue_push(&q, p);
	    }
	}
      if (!havedis)
	continue;
      solver_disablerule(solv, r);
      if (!havepos || q.count < 2)
	continue;
      if (q.count == 2)
	solver_addrule(solv, q.elements[0], q.elements[1], 0);
      else
	solver_addrule(solv, q.elements[0], 0, pool_ids2whatprovides(pool, q.elements + 1, q.count - 1));
      queue_push(&infoq, rid);
    }
  if (infoq.count)
    solv->recommendsrules_info = solv_memdup2(infoq.elements, infoq.count, sizeof(Id));
  queue_free(&infoq);
  queue_free(&q);
  solv->recommendsrules_end = solv->nrules;
}

void
solver_breakorphans(Solver *solv)
{
  Pool *pool = solv->pool;
  Repo *installed = solv->installed;
  int i, rid;
  Map m;

  if (!installed || solv->droporphanedmap_all)
    return;
  solv->brokenorphanrules = solv_calloc(1, sizeof(Queue));
  queue_init(solv->brokenorphanrules);
  map_init(&m, installed->end - installed->start);
  for (i = 0; i < solv->orphaned.count; i++)
    {
      Id p = solv->orphaned.elements[i];
      if (pool->solvables[p].repo != installed)
	continue;
      if (solv->droporphanedmap.size && MAPTST(&solv->droporphanedmap, p - installed->start))
	continue;
      MAPSET(&m, p - installed->start);
    }
  for (rid = 1; rid < solv->pkgrules_end ; rid++)
    {
      Id p, *dp;
      Rule *r = solv->rules + rid;
      /* ignore non-deps and simple conflicts */
      if (r->p >= 0 || ((r->d == 0 || r->d == -1) && r->w2 < 0))
	continue;
      p = -r->p;
      if (p < installed->start || p >= installed->end || !MAPTST(&m, p - installed->start))
	{
	  /* need to check other literals */
	  if (r->d == 0 || r->d == -1)
	    continue;
	  for (dp = pool->whatprovidesdata + (r->d < 0 ? -r->d - 1 : r->d); *dp < 0; dp++)
	    {
	      p = -*dp;
	      if (p >= installed->start && p < installed->end && MAPTST(&m, p - installed->start))
		break;
	    }
	  if (*dp >= 0)
	    continue;
	}
      /* ok, disable this rule */
      queue_push(solv->brokenorphanrules, rid);
      if (r->d >= 0)
	solver_disablerule(solv, r);
    }
  map_free(&m);
  if (!solv->brokenorphanrules->count)
    {
      queue_free(solv->brokenorphanrules);
      solv->brokenorphanrules = solv_free(solv->brokenorphanrules);
    }
}

void
solver_check_brokenorphanrules(Solver *solv, Queue *dq)
{
  Pool *pool = solv->pool;
  int i;
  Id l, pp;

  queue_empty(dq);
  if (!solv->brokenorphanrules)
    return;
  for (i = 0; i < solv->brokenorphanrules->count; i++)
    {
      int rid = solv->brokenorphanrules->elements[i];
      Rule *r = solv->rules + rid;
      FOR_RULELITERALS(l, pp, r)
	{
	  if (l < 0)
	    {
	      if (solv->decisionmap[-l] <= 0)
		break;
	    }
	  else
	    {
	      if (solv->decisionmap[l] > 0 && pool->solvables[l].repo != solv->installed)
		break;
	    }
	}
      if (l)
	continue;
      FOR_RULELITERALS(l, pp, r)
        if (l > 0 && solv->decisionmap[l] == 0 && pool->solvables[l].repo != solv->installed)
	  queue_pushunique(dq, l);
    }
}

const char *
solver_ruleinfo2str(Solver *solv, SolverRuleinfo type, Id source, Id target, Id dep)
{
  Pool *pool = solv->pool;
  char *s;
  Solvable *ss;
  switch (type)
    {
    case SOLVER_RULE_DISTUPGRADE:
      return pool_tmpjoin(pool, pool_solvid2str(pool, source), " does not belong to a distupgrade repository", 0);
    case SOLVER_RULE_INFARCH:
      return pool_tmpjoin(pool, pool_solvid2str(pool, source), " has inferior architecture", 0);
    case SOLVER_RULE_UPDATE:
      return pool_tmpjoin(pool, pool_solvid2str(pool, source), " needs to stay installed or be updated", 0);
    case SOLVER_RULE_FEATURE:
      return pool_tmpjoin(pool, pool_solvid2str(pool, source), " needs to stay installed or be updated/downgraded", 0);
    case SOLVER_RULE_JOB:
      return pool_tmpjoin(pool, "job ", pool_job2str(pool, target, dep, 0), 0);
    case SOLVER_RULE_JOB_UNSUPPORTED:
      return pool_tmpjoin(pool, "unsupported job ", pool_job2str(pool, target, dep, 0), 0);
    case SOLVER_RULE_JOB_NOTHING_PROVIDES_DEP:
      return pool_tmpjoin(pool, "nothing provides requested ", pool_dep2str(pool, dep), 0);
    case SOLVER_RULE_JOB_UNKNOWN_PACKAGE:
      return pool_tmpjoin(pool, "requested package ", pool_dep2str(pool, dep), " does not exist");
    case SOLVER_RULE_JOB_PROVIDED_BY_SYSTEM:
      return pool_tmpjoin(pool, "requested ", pool_dep2str(pool, dep), " is provided by the system");
    case SOLVER_RULE_BEST:
      if (source > 0)
        return pool_tmpjoin(pool, "install best update candidate for ", pool_solvid2str(pool, source), 0);
      if (target > 0)
	{
	  target = solver_rule2job(solv, target, &dep);
	  return pool_tmpjoin(pool, "best package for job ", pool_job2str(pool, target, dep, 0), 0);
	}
     return "best rule";
    case SOLVER_RULE_PKG:
      return "bad pkg rule type";
    case SOLVER_RULE_PKG_NOT_INSTALLABLE:
      ss = pool->solvables + source;
      if (pool_disabled_solvable(pool, ss))
        return pool_tmpjoin(pool, pool_solvid2str(pool, source), " is disabled", 0);
      if (ss->arch && ss->arch != ARCH_SRC && ss->arch != ARCH_NOSRC &&
          pool->id2arch && pool_arch2score(pool, ss->arch) == 0)
        return pool_tmpjoin(pool, pool_solvid2str(pool, source), " does not have a compatible architecture", 0);
      return pool_tmpjoin(pool, pool_solvid2str(pool, source), " is not installable", 0);
    case SOLVER_RULE_PKG_NOTHING_PROVIDES_DEP:
      s = pool_tmpjoin(pool, "nothing provides ", pool_dep2str(pool, dep), 0);
      return pool_tmpappend(pool, s, " needed by ", pool_solvid2str(pool, source));
    case SOLVER_RULE_PKG_SAME_NAME:
      s = pool_tmpjoin(pool, "cannot install both ", pool_solvid2str(pool, source), 0);
      return pool_tmpappend(pool, s, " and ", pool_solvid2str(pool, target));
    case SOLVER_RULE_PKG_CONFLICTS:
      s = pool_tmpappend(pool, pool_solvid2str(pool, source), " conflicts with ", pool_dep2str(pool, dep));
      if (target)
        s = pool_tmpappend(pool, s, " provided by ", pool_solvid2str(pool, target));
      return s;
    case SOLVER_RULE_PKG_SELF_CONFLICT:
      s = pool_tmpjoin(pool, pool_solvid2str(pool, source), " conflicts with ", 0);
      return pool_tmpappend(pool, s, pool_dep2str(pool, dep), " provided by itself");
    case SOLVER_RULE_PKG_OBSOLETES:
      s = pool_tmpappend(pool, pool_solvid2str(pool, source), " obsoletes ", pool_dep2str(pool, dep));
      if (target)
	s = pool_tmpappend(pool, s, " provided by ", pool_solvid2str(pool, target));
      return s;
    case SOLVER_RULE_PKG_INSTALLED_OBSOLETES:
      s = pool_tmpjoin(pool, "installed ", pool_solvid2str(pool, source), 0);
      s = pool_tmpappend(pool, s, " obsoletes ", pool_dep2str(pool, dep));
      if (target)
	s = pool_tmpappend(pool, s, " provided by ", pool_solvid2str(pool, target));
      return s;
    case SOLVER_RULE_PKG_IMPLICIT_OBSOLETES:
      s = pool_tmpappend(pool, pool_solvid2str(pool, source), " implicitly obsoletes ", pool_dep2str(pool, dep));
      if (target)
	s = pool_tmpappend(pool, s, " provided by ", pool_solvid2str(pool, target));
      return s;
    case SOLVER_RULE_PKG_REQUIRES:
      return pool_tmpjoin(pool, pool_solvid2str(pool, source), " requires ", pool_dep2str(pool, dep));
    case SOLVER_RULE_PKG_RECOMMENDS:
      return pool_tmpjoin(pool, pool_solvid2str(pool, source), " recommends ", pool_dep2str(pool, dep));
    case SOLVER_RULE_PKG_CONSTRAINS:
      s = pool_tmpappend(pool, pool_solvid2str(pool, source), " has constraint ", pool_dep2str(pool, dep));
      return pool_tmpappend(pool, s, " conflicting with ", pool_solvid2str(pool, target));
    case SOLVER_RULE_PKG_SUPPLEMENTS:
      s = pool_tmpjoin(pool, pool_solvid2str(pool, source), " supplements ", pool_dep2str(pool, dep));
      if (target)
	s = pool_tmpappend(pool, s, " provided by ", pool_solvid2str(pool, target));
      return s;
    case SOLVER_RULE_YUMOBS:
      s = pool_tmpjoin(pool, "both ", pool_solvid2str(pool, source), " and ");
      s = pool_tmpjoin(pool, s, pool_solvid2str(pool, target), " obsolete ");
      return pool_tmpappend(pool, s, pool_dep2str(pool, dep), 0);
    case SOLVER_RULE_BLACK:
      return pool_tmpjoin(pool, pool_solvid2str(pool, source), " can only be installed by a direct request", 0);
    case SOLVER_RULE_STRICT_REPO_PRIORITY:
      return pool_tmpjoin(pool, pool_solvid2str(pool, source), " is excluded by strict repo priority", 0);
    case SOLVER_RULE_LEARNT:
      return "learnt rule";
    case SOLVER_RULE_CHOICE:
      if (source > 0)
	{
	  const char *s2;
          type = solver_ruleinfo(solv, source, &source, &target, &dep);
	  s2 = solver_ruleinfo2str(solv, type, source, target, dep);
	  return pool_tmpjoin(pool, s2, " (limited version)", 0);
	}
      return "choice rule";
    case SOLVER_RULE_RECOMMENDS:
      if (source > 0)
	{
	  const char *s2;
          type = solver_ruleinfo(solv, source, &source, &target, &dep);
	  s2 = solver_ruleinfo2str(solv, type, source, target, dep);
	  return pool_tmpjoin(pool, s2, " (limited version)", 0);
	}
      return "recommends rule";
    default:
      return "bad rule type";
    }
}