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 #include <apt-pkg/acquire.h>
  37
  38 #include <iostream>
  39
  40 class pkgSimulate : public pkgPackageManager                            /*{{{*/
  41 {
  42    protected:
  43
  44    class Policy : public pkgDepCache::Policy
  45    {
  46       pkgDepCache *Cache;
  47       public:
  48
  49       virtual VerIterator GetCandidateVer(PkgIterator const &Pkg)
  50       {
  51          return (*Cache)[Pkg].CandidateVerIter(*Cache);
  52       }
  53
  54       Policy(pkgDepCache *Cache) : Cache(Cache) {};
  55    };
  56
  57    unsigned char *Flags;
  58
  59    Policy iPolicy;
  60    pkgDepCache Sim;
  61    pkgDepCache::ActionGroup group;
  62
  63    // The Actuall installation implementation
  64    virtual bool Install(PkgIterator Pkg,std::string File);
  65    virtual bool Configure(PkgIterator Pkg);
  66    virtual bool Remove(PkgIterator Pkg,bool Purge);
  67
  68 private:
  69    void ShortBreaks();
  70    void Describe(PkgIterator iPkg,std::ostream &out,bool Current,bool Candidate);
  71
  72    public:
  73
  74    pkgSimulate(pkgDepCache *Cache);
  75 };
  76                                                                         /*}}}*/
  77 class pkgProblemResolver                                                /*{{{*/
  78 {
  79    /** \brief dpointer placeholder (for later in case we need it) */
  80    void *d;
  81
  82    pkgDepCache &Cache;
  83    typedef pkgCache::PkgIterator PkgIterator;
  84    typedef pkgCache::VerIterator VerIterator;
  85    typedef pkgCache::DepIterator DepIterator;
  86    typedef pkgCache::PrvIterator PrvIterator;
  87    typedef pkgCache::Version Version;
  88    typedef pkgCache::Package Package;
  89
  90    enum Flags {Protected = (1 << 0), PreInstalled = (1 << 1),
  91                Upgradable = (1 << 2), ReInstateTried = (1 << 3),
  92                ToRemove = (1 << 4)};
  93    signed short *Scores;
  94    unsigned char *Flags;
  95    bool Debug;
  96
  97    // Sort stuff
  98    static pkgProblemResolver *This;
  99    static int ScoreSort(const void *a,const void *b);
 100
 101    struct PackageKill
 102    {
 103       PkgIterator Pkg;
 104       DepIterator Dep;
 105    };
 106
 107    void MakeScores();
 108    bool DoUpgrade(pkgCache::PkgIterator Pkg);
 109
 110    bool ResolveInternal(bool const BrokenFix = false);
 111    bool ResolveByKeepInternal();
 112
 113    protected:
 114    bool InstOrNewPolicyBroken(pkgCache::PkgIterator Pkg);
 115
 116    public:
 117
 118    inline void Protect(pkgCache::PkgIterator Pkg) {Flags[Pkg->ID] |= Protected; Cache.MarkProtected(Pkg);};
 119    inline void Remove(pkgCache::PkgIterator Pkg) {Flags[Pkg->ID] |= ToRemove;};
 120    inline void Clear(pkgCache::PkgIterator Pkg) {Flags[Pkg->ID] &= ~(Protected | ToRemove);};
 121
 122    // Try to intelligently resolve problems by installing and removing packages
 123    bool Resolve(bool BrokenFix = false);
 124
 125    // Try to resolve problems only by using keep
 126    bool ResolveByKeep();
 127
 128    // Install all protected packages
 129    void InstallProtect();
 130
 131    pkgProblemResolver(pkgDepCache *Cache);
 132    ~pkgProblemResolver();
 133 };
 134                                                                         /*}}}*/
 135 bool pkgDistUpgrade(pkgDepCache &Cache);
 136 bool pkgApplyStatus(pkgDepCache &Cache);
 137 bool pkgFixBroken(pkgDepCache &Cache);
 138 bool pkgAllUpgrade(pkgDepCache &Cache);
 139 bool pkgMinimizeUpgrade(pkgDepCache &Cache);
 140
 141 void pkgPrioSortList(pkgCache &Cache,pkgCache::Version **List);
 142
 143 bool ListUpdate(pkgAcquireStatus &progress, pkgSourceList &List, int PulseInterval=0);
 144
 145 #endif