QueueItemConflict.cc

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 4 -*- */
/* QueueItemConflict.cc
 *
 * Copyright (C) 2000-2002 Ximian, Inc.
 * Copyright (C) 2005 SUSE Linux Products GmbH
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
 * 02111-1307, USA.
 */

#include "zypp/CapFactory.h"
#include "zypp/CapSet.h"
#include "zypp/CapMatch.h"
#include "zypp/base/Logger.h"
#include "zypp/base/String.h"
#include "zypp/base/Gettext.h"
#include "zypp/base/Exception.h"

#include "zypp/base/Algorithm.h"
#include "zypp/ResPool.h"
#include "zypp/ResFilters.h"
#include "zypp/CapFilters.h"
#include "zypp/CapAndItem.h"

#include "zypp/solver/detail/Types.h"

#include "zypp/solver/detail/QueueItemConflict.h"
#include "zypp/solver/detail/QueueItemBranch.h"
#include "zypp/solver/detail/QueueItemInstall.h"
#include "zypp/solver/detail/QueueItemUninstall.h"
#include "zypp/solver/detail/QueueItem.h"
#include "zypp/solver/detail/ResolverContext.h"
#include "zypp/solver/detail/ResolverInfoConflictsWith.h"
#include "zypp/solver/detail/ResolverInfoMisc.h"
#include "zypp/solver/detail/ResolverInfoObsoletes.h"

namespace zypp
{ 

  namespace solver
  { 

    namespace detail
    { 

using namespace std;

IMPL_PTR_TYPE(QueueItemConflict);

//---------------------------------------------------------------------------

std::ostream &
QueueItemConflict::dumpOn( std::ostream & os ) const
{
    os << "[" << (_soft?"Soft":"") << "Conflict: ";
    os << _capability;
    os << ", Triggered by ";
    os << _conflicting_item;
    if (_actually_an_obsolete) os << ", Obsolete !";
    os << "]";
    return os;
}

//---------------------------------------------------------------------------

QueueItemConflict::QueueItemConflict (const ResPool & pool, const Capability & cap, PoolItem_Ref item, bool soft)
    : QueueItem (QUEUE_ITEM_TYPE_CONFLICT, pool)
    , _capability (cap)
    , _conflicting_item (item)
    , _soft (soft)
    , _actually_an_obsolete (false)
{
    _XDEBUG("QueueItemConflict::QueueItemConflict(" << cap << ", " << item << (soft?", soft":"") << ")");
}


QueueItemConflict::~QueueItemConflict()
{
}

//---------------------------------------------------------------------------

#if PHI

// on conflict, try to find upgrade candidates for the installed item triggering the conflict
// there are cases where upgrading prevents the conflict
// rc tends to uninstall the item
// phi tends to upgrade the item
// testcases: exercise-02conflict-08-test.xml, exercise-02conflict-09-test.xml

struct UpgradeCandidate
{
    PoolItem_Ref item; // the conflicting resolvable, used to filter upgrades with an identical resolvable
    ResolverContext_Ptr context;
    PoolItemList upgrades;

    UpgradeCandidate (PoolItem_Ref pi, ResolverContext_Ptr ctx)
        : item (pi)
        , context (ctx)
    { }

    bool operator() (const CapAndItem & cai)
    {

        PoolItem candidate = cai.item;

//MIL << "UpgradeCandidate? " << candidate << ":[" << context->getStatus (candidate) << "]" << (item->edition().compare(candidate->edition())) << "<" << item->arch() << "," << candidate->arch() << ">" << endl;
// FIXME put this in the resfilter chain
        ResStatus status = context->getStatus (candidate);
        if ((item->edition().compare(candidate->edition()) < 0)         // look at real upgrades
            && item->arch() == candidate->arch()                        // keep the architecture
            && (status.wasUninstalled()
                || status.isToBeUninstalled())                          // FIXME: just for exercise-02conflict-03-test.xml
                                                                        // the original solver found the uninstalled foo-2.0.1 first, this solver
                                                                        // finds the uninstallable first. In the end, we had a duplicate solution
                                                                        // now we have no solution. Both results are right.
           && (!status.isImpossible()) )
        {
//MIL << "UpgradeCandidate! " << candidate << endl;
            upgrades.push_back (candidate);
        }
        return true;
    }
};

#endif  // PHI


//---------------------------------------------------------------------------------------

struct ConflictProcess
{
    ResPool pool;
    PoolItem_Ref conflict_issuer;                       // the item which issues 'conflicts:'
    const Capability conflict_capability;               // the capability mentioned in the 'conflicts'
    ResolverContext_Ptr context;
    QueueItemList & new_items;
    bool actually_an_obsolete;

    ConflictProcess (const ResPool & pl, PoolItem_Ref ci, const Capability & cc, ResolverContext_Ptr ct, QueueItemList & ni, bool ao)
        : pool (pl)
        , conflict_issuer (ci)
        , conflict_capability (cc)
        , context (ct)
        , new_items (ni)
        , actually_an_obsolete (ao)
    { }

    bool operator()( const CapAndItem & cai )
    {
        ResStatus status;
        ResolverInfo_Ptr log_info;
        CapFactory factory;

        PoolItem provider = cai.item;
        Capability provides = cai.cap;

        _XDEBUG("conflict_process_cb (resolvable[" << provider <<"], provides[" << provides << "], conflicts with [" <<
              conflict_issuer << " conflicts: " << conflict_capability);

        /* We conflict with ourself.  For the purpose of installing ourself, we
         * just ignore it, but it's Debian's way of saying that one and only one
         * item with this provide may exist on the system at a time. */

        if (conflict_issuer
            && compareByNVRA (provider.resolvable(), conflict_issuer.resolvable()) == 0)
        {
            _XDEBUG("self-conflict");
            return true;
        }

#if 0 // Bug    220999; RPM does obsolete virtual provides too

        
        /* FIXME: This should probably be a GVersion capability. */
        /* Obsoletes don't apply to virtual provides, only the items
         * themselves.  A provide is "virtual" if it's not the same spec
         * as the item that's providing it.  This, of course, only
         * applies to RPM, since it's the only one with obsoletes right
         * now. */
        Capability capTest =  factory.parse ( provider->kind(), provider->name(), Rel::EQ, provider->edition());

        if (actually_an_obsolete
            && capTest.matches (provides) != CapMatch::yes )
        {
            _XDEBUG("obsolete to virtual provide - ignoring");
            return true;
        }
        
#endif // Bug   220999; RPM does obsolete virtual provides too  

        status = context->getStatus(provider);

        _XDEBUG("ConflictProcess (provider[" << provider << "]<" << status << ">");

        if (status.staysInstalled()
            || status.isToBeInstalledSoft())
        {
            ResolverInfo_Ptr log_info;

#if PHI
            _XDEBUG("Provider is installed - try upgrade");

            // maybe an upgrade can resolve the conflict ?
            //        check if other item is available which upgrades

            // find non-installed packages which provide the conflicting name

            UpgradeCandidate upgrade_info (provider, context);

            Capability maybe_upgrade_cap =  factory.parse ( provider->kind(), provider->name(), Rel::ANY, Edition::noedition );

            // pool->foreachProvidingResItem (maybe_upgrade_dep, upgrade_candidates_cb, (void *)&upgrade_info);
            Dep dep( Dep::PROVIDES );

            invokeOnEach( pool.byCapabilityIndexBegin( maybe_upgrade_cap.index(), dep ),
                          pool.byCapabilityIndexEnd( maybe_upgrade_cap.index(), dep ),
                          resfilter::ByCapMatch( maybe_upgrade_cap ),
                          functor::functorRef<bool,CapAndItem>(upgrade_info) );

            _XDEBUG("found " << upgrade_info.upgrades.size() << " upgrade candidates");
#endif

            QueueItemUninstall_Ptr uninstall = new QueueItemUninstall (pool, provider, actually_an_obsolete ? QueueItemUninstall::OBSOLETE : QueueItemUninstall::CONFLICT);
            uninstall->setCapability (conflict_capability);

            if (actually_an_obsolete) {
                uninstall->setDueToObsolete (conflict_issuer);
                log_info = new ResolverInfoObsoletes (provider,
                                                      conflict_issuer);
            } else {
                uninstall->setDueToConflict ();
                log_info = new ResolverInfoConflictsWith (provider,
                                                          conflict_issuer,
                                                          conflict_capability);
            }

            uninstall->addInfo (log_info);

#if PHI
            if (upgrade_info.upgrades.empty ()) {
#endif

                new_items.push_back (uninstall);

#if PHI
            }
            else {
                // there are upgrade candidates for the conflicting item
                // branch to: 1. uninstall, 2. upgrade (for each upgrading item)
                _DEBUG("Branching: uninstall vs. upgrade");
                QueueItemBranch_Ptr branch = new QueueItemBranch (pool);

                branch->addItem (uninstall);                    // try uninstall

                for (PoolItemList::const_iterator iter = upgrade_info.upgrades.begin(); iter != upgrade_info.upgrades.end(); iter++) {
                    QueueItemInstall_Ptr upgrade = new QueueItemInstall (pool, *iter);
                    upgrade->setUpgrades (provider);
                    branch->addItem (upgrade);                  // try upgrade
                }
                new_items.push_back (branch);
            }
#endif

        }
        else if (status.isToBeInstalled()) {
            ResolverInfoMisc_Ptr misc_info = new ResolverInfoMisc (RESOLVER_INFO_TYPE_CONFLICT_CANT_INSTALL, provider, RESOLVER_INFO_PRIORITY_VERBOSE, provides);
            if (conflict_issuer) {
                misc_info->setOtherPoolItem (conflict_issuer);
                misc_info->setOtherCapability (conflict_capability);
            }
            context->addError (misc_info);

        }
        else if (status.wasUninstalled()) {

            context->setStatus (provider, ResStatus::impossible);

            ResolverInfoMisc_Ptr misc_info = new ResolverInfoMisc (RESOLVER_INFO_TYPE_CONFLICT_UNINSTALLABLE, provider, RESOLVER_INFO_PRIORITY_VERBOSE, provides);

            misc_info->setOtherPoolItem (conflict_issuer);
            misc_info->setOtherCapability (conflict_capability);

            context->addInfo (misc_info);

        }
        else if ((status.isToBeUninstalled() && !status.isToBeUninstalledDueToUnlink())
                || status.isImpossible()
                || status.isToBeUninstalledDueToObsolete()) {

            /* This is the easy case -- we do nothing. */
        }
        else {
            ZYPP_THROW (Exception ("Unhandled status in ConflictProcess"));
        }

        return true;

    } // operator ()

}; // struct ConflictProcess


bool
QueueItemConflict::process (ResolverContext_Ptr context, QueueItemList & new_items)
{
    _XDEBUG("QueueItemConflict::process(" << *this << ")");

    // checking for ignoring dependencies
    IgnoreMap ignoreMap = context->getIgnoreConflicts();    
    for (IgnoreMap::iterator it = ignoreMap.begin();
         it != ignoreMap.end(); it++) {
        if (it->first == _conflicting_item
            && it->second == _capability) {
            _XDEBUG("Found ignoring requires " << _capability << " for " << _conflicting_item);
            return true;
        } else {
            _XDEBUG("Ignoring requires " << it->second << " for " <<  it->first << " does not fit");        
        }
    }

    ConflictProcess info (pool(), _conflicting_item, _capability, context, new_items, _actually_an_obsolete);

    // world()->foreachProvidingPoolItem (_capability, conflict_process_cb, (void *)&info);

    Dep dep( Dep::PROVIDES );
    invokeOnEach( pool().byCapabilityIndexBegin( _capability.index(), dep ),
                  pool().byCapabilityIndexEnd( _capability.index(), dep ),
                  resfilter::ByCapMatch( _capability ),
                  functor::functorRef<bool,CapAndItem>(info) );

    return true;
}


//---------------------------------------------------------------------------

QueueItem_Ptr
QueueItemConflict::copy (void) const
{
    QueueItemConflict_Ptr new_conflict = new QueueItemConflict (pool(), _capability, _conflicting_item);
    new_conflict->QueueItem::copy(this);

    // _actually_an_obsolete is not being copied !

    return new_conflict;
}


int
QueueItemConflict::cmp (QueueItem_constPtr item) const
{
    int cmp = this->compare (item);             // assures equal type
    if (cmp != 0)
        return cmp;

    QueueItemConflict_constPtr conflict = dynamic_pointer_cast<const QueueItemConflict>(item);
    if ( _capability != conflict->capability())
        cmp = -1;

    return cmp;
}

    };// namespace detail
  };// namespace solver
};// namespace zypp

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