apt-pkg/algorithms.h

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: algorithms.h,v 1.9 2001/02/20 07:03:17 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 #ifdef __GNUG__
  34 #pragma interface "apt-pkg/algorithms.h"
  35 #endif
  36
  37 #include <apt-pkg/packagemanager.h>
  38 #include <apt-pkg/depcache.h>
  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 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
  62    // The Actuall installation implementation
  63    virtual bool Install(PkgIterator Pkg,string File);
  64    virtual bool Configure(PkgIterator Pkg);
  65    virtual bool Remove(PkgIterator Pkg,bool Purge);
  66    void ShortBreaks();
  67    void Describe(PkgIterator iPkg,ostream &out,bool Now);
  68
  69    public:
  70
  71    pkgSimulate(pkgDepCache *Cache);
  72 };
  73
  74 class pkgProblemResolver
  75 {
  76    pkgDepCache &Cache;
  77    typedef pkgCache::PkgIterator PkgIterator;
  78    typedef pkgCache::VerIterator VerIterator;
  79    typedef pkgCache::DepIterator DepIterator;
  80    typedef pkgCache::PrvIterator PrvIterator;
  81    typedef pkgCache::Version Version;
  82    typedef pkgCache::Package Package;
  83
  84    enum Flags {Protected = (1 << 0), PreInstalled = (1 << 1),
  85                Upgradable = (1 << 2), ReInstateTried = (1 << 3),
  86                ToRemove = (1 << 4)};
  87    signed short *Scores;
  88    unsigned char *Flags;
  89    bool Debug;
  90
  91    // Sort stuff
  92    static pkgProblemResolver *This;
  93    static int ScoreSort(const void *a,const void *b);
  94
  95    struct PackageKill
  96    {
  97       PkgIterator Pkg;
  98       DepIterator Dep;
  99    };
 100
 101    void MakeScores();
 102    bool DoUpgrade(pkgCache::PkgIterator Pkg);
 103
 104    public:
 105
 106    inline void Protect(pkgCache::PkgIterator Pkg) {Flags[Pkg->ID] |= Protected;};
 107    inline void Remove(pkgCache::PkgIterator Pkg) {Flags[Pkg->ID] |= ToRemove;};
 108    inline void Clear(pkgCache::PkgIterator Pkg) {Flags[Pkg->ID] &= ~(Protected | ToRemove);};
 109
 110    // Try to intelligently resolve problems by installing and removing packages
 111    bool Resolve(bool BrokenFix = false);
 112
 113    // Try to resolve problems only by using keep
 114    bool ResolveByKeep();
 115
 116    void InstallProtect();
 117
 118    pkgProblemResolver(pkgDepCache *Cache);
 119    ~pkgProblemResolver();
 120 };
 121
 122 bool pkgDistUpgrade(pkgDepCache &Cache);
 123 bool pkgApplyStatus(pkgDepCache &Cache);
 124 bool pkgFixBroken(pkgDepCache &Cache);
 125 bool pkgAllUpgrade(pkgDepCache &Cache);
 126 bool pkgMinimizeUpgrade(pkgDepCache &Cache);
 127
 128 void pkgPrioSortList(pkgCache &Cache,pkgCache::Version **List);
 129
 130 #endif