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