// -*- mode: cpp; mode: fold -*- // Description /*{{{*/ // $Id: algorithms.h,v 1.10 2001/05/22 04:17:41 jgg Exp $ /* ###################################################################### Algorithms - A set of misc algorithms This simulate class displays what the ordering code has done and analyses it with a fresh new dependency cache. In this way we can see all of the effects of an upgrade run. pkgDistUpgrade computes an upgrade that causes as many packages as possible to move to the newest verison. pkgApplyStatus sets the target state based on the content of the status field in the status file. It is important to get proper crash recovery. pkgFixBroken corrects a broken system so that it is in a sane state. pkgAllUpgrade attempts to upgade as many packages as possible but without installing new packages. The problem resolver class contains a number of complex algorithms to try to best-guess an upgrade state. It solves the problem of maximizing the number of install state packages while having no broken packages. ##################################################################### */ /*}}}*/ #ifndef PKGLIB_ALGORITHMS_H #define PKGLIB_ALGORITHMS_H #ifdef __GNUG__ #pragma interface "apt-pkg/algorithms.h" #endif #include <apt-pkg/packagemanager.h> #include <apt-pkg/depcache.h> #include <iostream> using std::ostream; class pkgSimulate : public pkgPackageManager { protected: class Policy : public pkgDepCache::Policy { pkgDepCache *Cache; public: virtual VerIterator GetCandidateVer(PkgIterator Pkg) { return (*Cache)[Pkg].CandidateVerIter(*Cache); } Policy(pkgDepCache *Cache) : Cache(Cache) {}; }; unsigned char *Flags; Policy iPolicy; pkgDepCache Sim; // The Actuall installation implementation virtual bool Install(PkgIterator Pkg,string File); virtual bool Configure(PkgIterator Pkg); virtual bool Remove(PkgIterator Pkg,bool Purge); void ShortBreaks(); void Describe(PkgIterator iPkg,ostream &out,bool Now); public: pkgSimulate(pkgDepCache *Cache); }; class pkgProblemResolver { pkgDepCache &Cache; typedef pkgCache::PkgIterator PkgIterator; typedef pkgCache::VerIterator VerIterator; typedef pkgCache::DepIterator DepIterator; typedef pkgCache::PrvIterator PrvIterator; typedef pkgCache::Version Version; typedef pkgCache::Package Package; enum Flags {Protected = (1 << 0), PreInstalled = (1 << 1), Upgradable = (1 << 2), ReInstateTried = (1 << 3), ToRemove = (1 << 4)}; signed short *Scores; unsigned char *Flags; bool Debug; // Sort stuff static pkgProblemResolver *This; static int ScoreSort(const void *a,const void *b); struct PackageKill { PkgIterator Pkg; DepIterator Dep; }; void MakeScores(); bool DoUpgrade(pkgCache::PkgIterator Pkg); public: inline void Protect(pkgCache::PkgIterator Pkg) {Flags[Pkg->ID] |= Protected;}; inline void Remove(pkgCache::PkgIterator Pkg) {Flags[Pkg->ID] |= ToRemove;}; inline void Clear(pkgCache::PkgIterator Pkg) {Flags[Pkg->ID] &= ~(Protected | ToRemove);}; // Try to intelligently resolve problems by installing and removing packages bool Resolve(bool BrokenFix = false); // Try to resolve problems only by using keep bool ResolveByKeep(); void InstallProtect(); pkgProblemResolver(pkgDepCache *Cache); ~pkgProblemResolver(); }; bool pkgDistUpgrade(pkgDepCache &Cache); bool pkgApplyStatus(pkgDepCache &Cache); bool pkgFixBroken(pkgDepCache &Cache); bool pkgAllUpgrade(pkgDepCache &Cache); bool pkgMinimizeUpgrade(pkgDepCache &Cache); void pkgPrioSortList(pkgCache &Cache,pkgCache::Version **List); #endif