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 // include pkg{DistUpgrade,AllUpgrade,MiniizeUpgrade} here for compatiblity
  44 using std::ostream;
  45 #endif
  46
  47 #ifndef APT_9_CLEANER_HEADERS
  48 #include <apt-pkg/upgrade.h>
  49 #endif
  50
  51 class pkgAcquireStatus;
  52
  53
  54 class pkgSimulate : public pkgPackageManager                            /*{{{*/
  55 {
  56    protected:
  57
  58    class Policy : public pkgDepCache::Policy
  59    {
  60       pkgDepCache *Cache;
  61       public:
  62
  63       virtual VerIterator GetCandidateVer(PkgIterator const &Pkg)
  64       {
  65          return (*Cache)[Pkg].CandidateVerIter(*Cache);
  66       }
  67
  68       Policy(pkgDepCache *Cache) : Cache(Cache) {};
  69    };
  70
  71    unsigned char *Flags;
  72
  73    Policy iPolicy;
  74    pkgDepCache Sim;
  75    pkgDepCache::ActionGroup group;
  76
  77    // The Actuall installation implementation
  78    virtual bool Install(PkgIterator Pkg,std::string File);
  79    virtual bool Configure(PkgIterator Pkg);
  80    virtual bool Remove(PkgIterator Pkg,bool Purge);
  81
  82 private:
  83    void ShortBreaks();
  84    void Describe(PkgIterator iPkg,std::ostream &out,bool Current,bool Candidate);
  85
  86    public:
  87
  88    pkgSimulate(pkgDepCache *Cache);
  89    ~pkgSimulate();
  90 };
  91                                                                         /*}}}*/
  92 class pkgProblemResolver                                                /*{{{*/
  93 {
  94  private:
  95    /** \brief dpointer placeholder (for later in case we need it) */
  96    void *d;
  97
  98    pkgDepCache &Cache;
  99    typedef pkgCache::PkgIterator PkgIterator;
 100    typedef pkgCache::VerIterator VerIterator;
 101    typedef pkgCache::DepIterator DepIterator;
 102    typedef pkgCache::PrvIterator PrvIterator;
 103    typedef pkgCache::Version Version;
 104    typedef pkgCache::Package Package;
 105
 106    enum Flags {Protected = (1 << 0), PreInstalled = (1 << 1),
 107                Upgradable = (1 << 2), ReInstateTried = (1 << 3),
 108                ToRemove = (1 << 4)};
 109    int *Scores;
 110    unsigned char *Flags;
 111    bool Debug;
 112
 113    // Sort stuff
 114    static pkgProblemResolver *This;
 115    static int ScoreSort(const void *a,const void *b);
 116
 117    struct PackageKill
 118    {
 119       PkgIterator Pkg;
 120       DepIterator Dep;
 121    };
 122
 123    void MakeScores();
 124    bool DoUpgrade(pkgCache::PkgIterator Pkg);
 125
 126    bool ResolveInternal(bool const BrokenFix = false);
 127    bool ResolveByKeepInternal();
 128
 129    protected:
 130    bool InstOrNewPolicyBroken(pkgCache::PkgIterator Pkg);
 131
 132    public:
 133
 134    inline void Protect(pkgCache::PkgIterator Pkg) {Flags[Pkg->ID] |= Protected; Cache.MarkProtected(Pkg);};
 135    inline void Remove(pkgCache::PkgIterator Pkg) {Flags[Pkg->ID] |= ToRemove;};
 136    inline void Clear(pkgCache::PkgIterator Pkg) {Flags[Pkg->ID] &= ~(Protected | ToRemove);};
 137
 138    // Try to intelligently resolve problems by installing and removing packages
 139    bool Resolve(bool BrokenFix = false);
 140
 141    // Try to resolve problems only by using keep
 142    bool ResolveByKeep();
 143
 144    __deprecated void InstallProtect();
 145
 146    pkgProblemResolver(pkgDepCache *Cache);
 147    ~pkgProblemResolver();
 148 };
 149                                                                         /*}}}*/
 150 bool pkgApplyStatus(pkgDepCache &Cache);
 151 bool pkgFixBroken(pkgDepCache &Cache);
 152
 153 void pkgPrioSortList(pkgCache &Cache,pkgCache::Version **List);
 154
 155 bool ListUpdate(pkgAcquireStatus &progress, pkgSourceList &List, int PulseInterval=0);
 156 bool AcquireUpdate(pkgAcquire &Fetcher, int const PulseInterval = 0,
 157                    bool const RunUpdateScripts = true, bool const ListCleanup = true);
 158
 159 #endif