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