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    ~pkgSimulate();
  82 };
  83                                                                         /*}}}*/
  84 class pkgProblemResolver                                                /*{{{*/
  85 {
  86    /** \brief dpointer placeholder (for later in case we need it) */
  87    void *d;
  88
  89    pkgDepCache &Cache;
  90    typedef pkgCache::PkgIterator PkgIterator;
  91    typedef pkgCache::VerIterator VerIterator;
  92    typedef pkgCache::DepIterator DepIterator;
  93    typedef pkgCache::PrvIterator PrvIterator;
  94    typedef pkgCache::Version Version;
  95    typedef pkgCache::Package Package;
  96
  97    enum Flags {Protected = (1 << 0), PreInstalled = (1 << 1),
  98                Upgradable = (1 << 2), ReInstateTried = (1 << 3),
  99                ToRemove = (1 << 4)};
 100    int *Scores;
 101    unsigned char *Flags;
 102    bool Debug;
 103
 104    // Sort stuff
 105    static pkgProblemResolver *This;
 106    static int ScoreSort(const void *a,const void *b);
 107
 108    struct PackageKill
 109    {
 110       PkgIterator Pkg;
 111       DepIterator Dep;
 112    };
 113
 114    void MakeScores();
 115    bool DoUpgrade(pkgCache::PkgIterator Pkg);
 116
 117    bool ResolveInternal(bool const BrokenFix = false);
 118    bool ResolveByKeepInternal();
 119
 120    protected:
 121    bool InstOrNewPolicyBroken(pkgCache::PkgIterator Pkg);
 122
 123    public:
 124
 125    inline void Protect(pkgCache::PkgIterator Pkg) {Flags[Pkg->ID] |= Protected; Cache.MarkProtected(Pkg);};
 126    inline void Remove(pkgCache::PkgIterator Pkg) {Flags[Pkg->ID] |= ToRemove;};
 127    inline void Clear(pkgCache::PkgIterator Pkg) {Flags[Pkg->ID] &= ~(Protected | ToRemove);};
 128
 129    // Try to intelligently resolve problems by installing and removing packages
 130    bool Resolve(bool BrokenFix = false);
 131
 132    // Try to resolve problems only by using keep
 133    bool ResolveByKeep();
 134
 135    // Install all protected packages
 136    void InstallProtect();
 137
 138    pkgProblemResolver(pkgDepCache *Cache);
 139    ~pkgProblemResolver();
 140 };
 141                                                                         /*}}}*/
 142 bool pkgDistUpgrade(pkgDepCache &Cache);
 143 bool pkgApplyStatus(pkgDepCache &Cache);
 144 bool pkgFixBroken(pkgDepCache &Cache);
 145 bool pkgAllUpgrade(pkgDepCache &Cache);
 146 bool pkgMinimizeUpgrade(pkgDepCache &Cache);
 147
 148 void pkgPrioSortList(pkgCache &Cache,pkgCache::Version **List);
 149
 150 bool ListUpdate(pkgAcquireStatus &progress, pkgSourceList &List, int PulseInterval=0);
 151 bool AcquireUpdate(pkgAcquire &Fetcher, int const PulseInterval = 0,
 152                    bool const RunUpdateScripts = true, bool const ListCleanup = true);
 153
 154 #endif