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 #include <apt-pkg/macros.h>
  40
  41 #ifndef APT_8_CLEANER_HEADERS
  42 #include <apt-pkg/acquire.h>
  43 using std::ostream;
  44 #endif
  45
  46 class pkgAcquireStatus;
  47
  48 class pkgSimulate : public pkgPackageManager                            /*{{{*/
  49 {
  50    protected:
  51
  52    class Policy : public pkgDepCache::Policy
  53    {
  54       pkgDepCache *Cache;
  55       public:
  56
  57       virtual VerIterator GetCandidateVer(PkgIterator const &Pkg)
  58       {
  59          return (*Cache)[Pkg].CandidateVerIter(*Cache);
  60       }
  61
  62       Policy(pkgDepCache *Cache) : Cache(Cache) {};
  63    };
  64
  65    unsigned char *Flags;
  66
  67    Policy iPolicy;
  68    pkgDepCache Sim;
  69    pkgDepCache::ActionGroup group;
  70
  71    // The Actuall installation implementation
  72    virtual bool Install(PkgIterator Pkg,std::string File);
  73    virtual bool Configure(PkgIterator Pkg);
  74    virtual bool Remove(PkgIterator Pkg,bool Purge);
  75
  76 private:
  77    void ShortBreaks();
  78    void Describe(PkgIterator iPkg,std::ostream &out,bool Current,bool Candidate);
  79
  80    public:
  81
  82    pkgSimulate(pkgDepCache *Cache);
  83    ~pkgSimulate();
  84 };
  85                                                                         /*}}}*/
  86 class pkgProblemResolver                                                /*{{{*/
  87 {
  88    /** \brief dpointer placeholder (for later in case we need it) */
  89    void *d;
  90
  91    pkgDepCache &Cache;
  92    typedef pkgCache::PkgIterator PkgIterator;
  93    typedef pkgCache::VerIterator VerIterator;
  94    typedef pkgCache::DepIterator DepIterator;
  95    typedef pkgCache::PrvIterator PrvIterator;
  96    typedef pkgCache::Version Version;
  97    typedef pkgCache::Package Package;
  98
  99    enum Flags {Protected = (1 << 0), PreInstalled = (1 << 1),
 100                Upgradable = (1 << 2), ReInstateTried = (1 << 3),
 101                ToRemove = (1 << 4)};
 102    int *Scores;
 103    unsigned char *Flags;
 104    bool Debug;
 105
 106    // Sort stuff
 107    static pkgProblemResolver *This;
 108    static int ScoreSort(const void *a,const void *b);
 109
 110    struct PackageKill
 111    {
 112       PkgIterator Pkg;
 113       DepIterator Dep;
 114    };
 115
 116    void MakeScores();
 117    bool DoUpgrade(pkgCache::PkgIterator Pkg);
 118
 119    bool ResolveInternal(bool const BrokenFix = false);
 120    bool ResolveByKeepInternal();
 121
 122    protected:
 123    bool InstOrNewPolicyBroken(pkgCache::PkgIterator Pkg);
 124
 125    public:
 126
 127    inline void Protect(pkgCache::PkgIterator Pkg) {Flags[Pkg->ID] |= Protected; Cache.MarkProtected(Pkg);};
 128    inline void Remove(pkgCache::PkgIterator Pkg) {Flags[Pkg->ID] |= ToRemove;};
 129    inline void Clear(pkgCache::PkgIterator Pkg) {Flags[Pkg->ID] &= ~(Protected | ToRemove);};
 130
 131    // Try to intelligently resolve problems by installing and removing packages
 132    bool Resolve(bool BrokenFix = false);
 133
 134    // Try to resolve problems only by using keep
 135    bool ResolveByKeep();
 136
 137    __deprecated void InstallProtect();
 138
 139    pkgProblemResolver(pkgDepCache *Cache);
 140    ~pkgProblemResolver();
 141 };
 142                                                                         /*}}}*/
 143 bool pkgDistUpgrade(pkgDepCache &Cache);
 144 bool pkgApplyStatus(pkgDepCache &Cache);
 145 bool pkgFixBroken(pkgDepCache &Cache);
 146 bool pkgAllUpgrade(pkgDepCache &Cache);
 147 bool pkgMinimizeUpgrade(pkgDepCache &Cache);
 148
 149 void pkgPrioSortList(pkgCache &Cache,pkgCache::Version **List);
 150
 151 bool ListUpdate(pkgAcquireStatus &progress, pkgSourceList &List, int PulseInterval=0);
 152 bool AcquireUpdate(pkgAcquire &Fetcher, int const PulseInterval = 0,
 153                    bool const RunUpdateScripts = true, bool const ListCleanup = true);
 154
 155 #endif