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 #ifndef APT_8_CLEANER_HEADERS
  40 #include <apt-pkg/acquire.h>
  41 using std::ostream;
  42 #endif
  43
  44 class pkgAcquireStatus;
  45
  46 class pkgSimulate : public pkgPackageManager                            /*{{{*/
  47 {
  48    protected:
  49
  50    class Policy : public pkgDepCache::Policy
  51    {
  52       pkgDepCache *Cache;
  53       public:
  54
  55       virtual VerIterator GetCandidateVer(PkgIterator const &Pkg)
  56       {
  57          return (*Cache)[Pkg].CandidateVerIter(*Cache);
  58       }
  59
  60       Policy(pkgDepCache *Cache) : Cache(Cache) {};
  61    };
  62
  63    unsigned char *Flags;
  64
  65    Policy iPolicy;
  66    pkgDepCache Sim;
  67    pkgDepCache::ActionGroup group;
  68
  69    // The Actuall installation implementation
  70    virtual bool Install(PkgIterator Pkg,std::string File);
  71    virtual bool Configure(PkgIterator Pkg);
  72    virtual bool Remove(PkgIterator Pkg,bool Purge);
  73
  74 private:
  75    void ShortBreaks();
  76    void Describe(PkgIterator iPkg,std::ostream &out,bool Current,bool Candidate);
  77
  78    public:
  79
  80    pkgSimulate(pkgDepCache *Cache);
  81 };
  82                                                                         /*}}}*/
  83 class pkgProblemResolver                                                /*{{{*/
  84 {
  85    /** \brief dpointer placeholder (for later in case we need it) */
  86    void *d;
  87
  88    pkgDepCache &Cache;
  89    typedef pkgCache::PkgIterator PkgIterator;
  90    typedef pkgCache::VerIterator VerIterator;
  91    typedef pkgCache::DepIterator DepIterator;
  92    typedef pkgCache::PrvIterator PrvIterator;
  93    typedef pkgCache::Version Version;
  94    typedef pkgCache::Package Package;
  95
  96    enum Flags {Protected = (1 << 0), PreInstalled = (1 << 1),
  97                Upgradable = (1 << 2), ReInstateTried = (1 << 3),
  98                ToRemove = (1 << 4)};
  99    signed short *Scores;
 100    unsigned char *Flags;
 101    bool Debug;
 102
 103    // Sort stuff
 104    static pkgProblemResolver *This;
 105    static int ScoreSort(const void *a,const void *b);
 106
 107    struct PackageKill
 108    {
 109       PkgIterator Pkg;
 110       DepIterator Dep;
 111    };
 112
 113    void MakeScores();
 114    bool DoUpgrade(pkgCache::PkgIterator Pkg);
 115
 116    bool ResolveInternal(bool const BrokenFix = false);
 117    bool ResolveByKeepInternal();
 118
 119    protected:
 120    bool InstOrNewPolicyBroken(pkgCache::PkgIterator Pkg);
 121
 122    public:
 123
 124    inline void Protect(pkgCache::PkgIterator Pkg) {Flags[Pkg->ID] |= Protected; Cache.MarkProtected(Pkg);};
 125    inline void Remove(pkgCache::PkgIterator Pkg) {Flags[Pkg->ID] |= ToRemove;};
 126    inline void Clear(pkgCache::PkgIterator Pkg) {Flags[Pkg->ID] &= ~(Protected | ToRemove);};
 127
 128    // Try to intelligently resolve problems by installing and removing packages
 129    bool Resolve(bool BrokenFix = false);
 130
 131    // Try to resolve problems only by using keep
 132    bool ResolveByKeep();
 133
 134    // Install all protected packages
 135    void InstallProtect();
 136
 137    pkgProblemResolver(pkgDepCache *Cache);
 138    ~pkgProblemResolver();
 139 };
 140                                                                         /*}}}*/
 141 bool pkgDistUpgrade(pkgDepCache &Cache);
 142 bool pkgApplyStatus(pkgDepCache &Cache);
 143 bool pkgFixBroken(pkgDepCache &Cache);
 144 bool pkgAllUpgrade(pkgDepCache &Cache);
 145 bool pkgMinimizeUpgrade(pkgDepCache &Cache);
 146
 147 void pkgPrioSortList(pkgCache &Cache,pkgCache::Version **List);
 148
 149 bool ListUpdate(pkgAcquireStatus &progress, pkgSourceList &List, int PulseInterval=0);
 150
 151 #endif