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