apt-pkg/algorithms.h

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: algorithms.h,v 1.10 2001/05/22 04:17:41 jgg Exp $
   4 /* ######################################################################
   5
   6    Algorithms - A set of misc algorithms
   7
   8    This simulate class displays what the ordering code has done and
   9    analyses it with a fresh new dependency cache. In this way we can
  10    see all of the effects of an upgrade run.
  11
  12    pkgDistUpgrade computes an upgrade that causes as many packages as
  13    possible to move to the newest verison.
  14
  15    pkgApplyStatus sets the target state based on the content of the status
  16    field in the status file. It is important to get proper crash recovery.
  17
  18    pkgFixBroken corrects a broken system so that it is in a sane state.
  19
  20    pkgAllUpgrade attempts to upgade as many packages as possible but
  21    without installing new packages.
  22
  23    The problem resolver class contains a number of complex algorithms
  24    to try to best-guess an upgrade state. It solves the problem of
  25    maximizing the number of install state packages while having no broken
  26    packages.
  27
  28    ##################################################################### */
  29                                                                         /*}}}*/
  30 #ifndef PKGLIB_ALGORITHMS_H
  31 #define PKGLIB_ALGORITHMS_H
  32
  33
  34 #include <apt-pkg/packagemanager.h>
  35 #include <apt-pkg/depcache.h>
  36
  37 #include <iostream>
  38
  39 #include <apt-pkg/macros.h>
  40
  41 #ifndef APT_8_CLEANER_HEADERS
  42 #include <apt-pkg/acquire.h>
  43 using std::ostream;
  44 #endif
  45
  46 #ifndef APT_9_CLEANER_HEADERS
  47 // include pkg{DistUpgrade,AllUpgrade,MiniizeUpgrade} here for compatiblity
  48 #include <apt-pkg/upgrade.h>
  49 #include <apt-pkg/update.h>
  50 #endif
  51
  52
  53 class pkgSimulate : public pkgPackageManager                            /*{{{*/
  54 {
  55    protected:
  56
  57    class Policy : public pkgDepCache::Policy
  58    {
  59       pkgDepCache *Cache;
  60       public:
  61
  62       virtual VerIterator GetCandidateVer(PkgIterator const &Pkg)
  63       {
  64          return (*Cache)[Pkg].CandidateVerIter(*Cache);
  65       }
  66
  67       Policy(pkgDepCache *Cache) : Cache(Cache) {};
  68    };
  69
  70    unsigned char *Flags;
  71
  72    Policy iPolicy;
  73    pkgDepCache Sim;
  74    pkgDepCache::ActionGroup group;
  75
  76    // The Actuall installation implementation
  77    virtual bool Install(PkgIterator Pkg,std::string File);
  78    virtual bool Configure(PkgIterator Pkg);
  79    virtual bool Remove(PkgIterator Pkg,bool Purge);
  80
  81 private:
  82    void ShortBreaks();
  83    void Describe(PkgIterator iPkg,std::ostream &out,bool Current,bool Candidate);
  84
  85    public:
  86
  87    pkgSimulate(pkgDepCache *Cache);
  88    ~pkgSimulate();
  89 };
  90                                                                         /*}}}*/
  91 class pkgProblemResolver                                                /*{{{*/
  92 {
  93  private:
  94    /** \brief dpointer placeholder (for later in case we need it) */
  95    void *d;
  96
  97    pkgDepCache &Cache;
  98    typedef pkgCache::PkgIterator PkgIterator;
  99    typedef pkgCache::VerIterator VerIterator;
 100    typedef pkgCache::DepIterator DepIterator;
 101    typedef pkgCache::PrvIterator PrvIterator;
 102    typedef pkgCache::Version Version;
 103    typedef pkgCache::Package Package;
 104
 105    enum Flags {Protected = (1 << 0), PreInstalled = (1 << 1),
 106                Upgradable = (1 << 2), ReInstateTried = (1 << 3),
 107                ToRemove = (1 << 4)};
 108    int *Scores;
 109    unsigned char *Flags;
 110    bool Debug;
 111
 112    // Sort stuff
 113    static pkgProblemResolver *This;
 114    static int ScoreSort(const void *a,const void *b);
 115
 116    struct PackageKill
 117    {
 118       PkgIterator Pkg;
 119       DepIterator Dep;
 120    };
 121
 122    void MakeScores();
 123    bool DoUpgrade(pkgCache::PkgIterator Pkg);
 124
 125    bool ResolveInternal(bool const BrokenFix = false);
 126    bool ResolveByKeepInternal();
 127
 128    protected:
 129    bool InstOrNewPolicyBroken(pkgCache::PkgIterator Pkg);
 130
 131    public:
 132
 133    inline void Protect(pkgCache::PkgIterator Pkg) {Flags[Pkg->ID] |= Protected; Cache.MarkProtected(Pkg);};
 134    inline void Remove(pkgCache::PkgIterator Pkg) {Flags[Pkg->ID] |= ToRemove;};
 135    inline void Clear(pkgCache::PkgIterator Pkg) {Flags[Pkg->ID] &= ~(Protected | ToRemove);};
 136
 137    // Try to intelligently resolve problems by installing and removing packages
 138    bool Resolve(bool BrokenFix = false);
 139
 140    // Try to resolve problems only by using keep
 141    bool ResolveByKeep();
 142
 143    __deprecated void InstallProtect();
 144
 145    pkgProblemResolver(pkgDepCache *Cache);
 146    ~pkgProblemResolver();
 147 };
 148                                                                         /*}}}*/
 149 bool pkgApplyStatus(pkgDepCache &Cache);
 150 bool pkgFixBroken(pkgDepCache &Cache);
 151
 152 void pkgPrioSortList(pkgCache &Cache,pkgCache::Version **List);
 153
 154
 155 #endif