// -*- mode: cpp; mode: fold -*- // Description /*{{{*/ // $Id: algorithms.cc,v 1.16 1999/02/05 02:26:00 jgg Exp $ /* ###################################################################### Algorithms - A set of misc algorithms The pkgProblemResolver class has become insanely complex and very sophisticated, it handles every test case I have thrown at it to my satisfaction. Understanding exactly why all the steps the class does are required is difficult and changing though not very risky may result in other cases not working. ##################################################################### */ /*}}}*/ // Include Files /*{{{*/ #ifdef __GNUG__ #pragma implementation "apt-pkg/algorithms.h" #endif #include <apt-pkg/algorithms.h> #include <apt-pkg/error.h> #include <apt-pkg/configuration.h> #include <iostream.h> /*}}}*/ pkgProblemResolver *pkgProblemResolver::This = 0; // Simulate::Simulate - Constructor /*{{{*/ // --------------------------------------------------------------------- /* */ pkgSimulate::pkgSimulate(pkgDepCache &Cache) : pkgPackageManager(Cache), Sim(Cache.GetMap()) { Flags = new unsigned char[Cache.HeaderP->PackageCount]; memset(Flags,0,sizeof(*Flags)*Cache.HeaderP->PackageCount); } /*}}}*/ // Simulate::Install - Simulate unpacking of a package /*{{{*/ // --------------------------------------------------------------------- /* */ bool pkgSimulate::Install(PkgIterator iPkg,string /*File*/) { // Adapt the iterator PkgIterator Pkg = Sim.FindPkg(iPkg.Name()); Flags[Pkg->ID] = 1; cout << "Inst " << Pkg.Name(); Sim.MarkInstall(Pkg,false); // Look for broken conflicts+predepends. for (PkgIterator I = Sim.PkgBegin(); I.end() == false; I++) { if (Sim[I].InstallVer == 0) continue; for (DepIterator D = Sim[I].InstVerIter(Sim).DependsList(); D.end() == false; D++) if (D->Type == pkgCache::Dep::Conflicts || D->Type == pkgCache::Dep::PreDepends) { if ((Sim[D] & pkgDepCache::DepInstall) == 0) { cout << " [" << I.Name() << " on " << D.TargetPkg().Name() << ']'; if (D->Type == pkgCache::Dep::Conflicts) _error->Error("Fatal, conflicts violated %s",I.Name()); } } } if (Sim.BrokenCount() != 0) ShortBreaks(); else cout << endl; return true; } /*}}}*/ // Simulate::Configure - Simulate configuration of a Package /*{{{*/ // --------------------------------------------------------------------- /* This is not an acurate simulation of relatity, we should really not install the package.. For some investigations it may be necessary however. */ bool pkgSimulate::Configure(PkgIterator iPkg) { // Adapt the iterator PkgIterator Pkg = Sim.FindPkg(iPkg.Name()); Flags[Pkg->ID] = 2; // Sim.MarkInstall(Pkg,false); if (Sim[Pkg].InstBroken() == true) { cout << "Conf " << Pkg.Name() << " broken" << endl; Sim.Update(); // Print out each package and the failed dependencies for (pkgCache::DepIterator D = Sim[Pkg].InstVerIter(Sim).DependsList(); D.end() == false; D++) { if (Sim.IsImportantDep(D) == false || (Sim[D] & pkgDepCache::DepInstall) != 0) continue; if (D->Type == pkgCache::Dep::Conflicts) cout << " Conflicts:" << D.TargetPkg().Name(); else cout << " Depends:" << D.TargetPkg().Name(); } cout << endl; _error->Error("Conf Broken %s",Pkg.Name()); } else cout << "Conf " << Pkg.Name(); if (Sim.BrokenCount() != 0) ShortBreaks(); else cout << endl; return true; } /*}}}*/ // Simulate::Remove - Simulate the removal of a package /*{{{*/ // --------------------------------------------------------------------- /* */ bool pkgSimulate::Remove(PkgIterator iPkg) { // Adapt the iterator PkgIterator Pkg = Sim.FindPkg(iPkg.Name()); Flags[Pkg->ID] = 3; Sim.MarkDelete(Pkg); cout << "Remv " << Pkg.Name(); if (Sim.BrokenCount() != 0) ShortBreaks(); else cout << endl; return true; } /*}}}*/ // Simulate::ShortBreaks - Print out a short line describing all breaks /*{{{*/ // --------------------------------------------------------------------- /* */ void pkgSimulate::ShortBreaks() { cout << " ["; for (PkgIterator I = Sim.PkgBegin(); I.end() == false; I++) { if (Sim[I].InstBroken() == true) { if (Flags[I->ID] == 0) cout << I.Name() << ' '; /* else cout << I.Name() << "! ";*/ } } cout << ']' << endl; } /*}}}*/ // ApplyStatus - Adjust for non-ok packages /*{{{*/ // --------------------------------------------------------------------- /* We attempt to change the state of the all packages that have failed installation toward their real state. The ordering code will perform the necessary calculations to deal with the problems. */ bool pkgApplyStatus(pkgDepCache &Cache) { for (pkgCache::PkgIterator I = Cache.PkgBegin(); I.end() == false; I++) { // Only choice for a ReInstReq package is to reinstall if (I->InstState == pkgCache::State::ReInstReq || I->InstState == pkgCache::State::HoldReInstReq) { Cache.MarkKeep(I); continue; } switch (I->CurrentState) { // This means installation failed somehow case pkgCache::State::UnPacked: case pkgCache::State::HalfConfigured: Cache.MarkKeep(I); break; // This means removal failed case pkgCache::State::HalfInstalled: Cache.MarkDelete(I); break; default: if (I->InstState != pkgCache::State::Ok) return _error->Error("The package %s is not ok and I " "don't know how to fix it!",I.Name()); } } return true; } /*}}}*/ // FixBroken - Fix broken packages /*{{{*/ // --------------------------------------------------------------------- /* This autoinstalls every broken package and then runs the problem resolver on the result. */ bool pkgFixBroken(pkgDepCache &Cache) { // Auto upgrade all broken packages for (pkgCache::PkgIterator I = Cache.PkgBegin(); I.end() == false; I++) if (Cache[I].NowBroken() == true) Cache.MarkInstall(I,true); /* Fix packages that are in a NeedArchive state but don't have a downloadable install version */ for (pkgCache::PkgIterator I = Cache.PkgBegin(); I.end() == false; I++) { if (I.State() != pkgCache::PkgIterator::NeedsUnpack || Cache[I].Delete() == true) continue; if (Cache[I].InstVerIter(Cache).Downloadable() == false) continue; Cache.MarkInstall(I,true); } pkgProblemResolver Fix(Cache); return Fix.Resolve(true); } /*}}}*/ // DistUpgrade - Distribution upgrade /*{{{*/ // --------------------------------------------------------------------- /* This autoinstalls every package and then force installs every pre-existing package. This creates the initial set of conditions which most likely contain problems because too many things were installed. The problem resolver is used to resolve the problems. */ bool pkgDistUpgrade(pkgDepCache &Cache) { /* Auto upgrade all installed packages, this provides the basis for the installation */ for (pkgCache::PkgIterator I = Cache.PkgBegin(); I.end() == false; I++) if (I->CurrentVer != 0) Cache.MarkInstall(I,true); /* Now, auto upgrade all essential packages - this ensures that the essential packages are present and working */ for (pkgCache::PkgIterator I = Cache.PkgBegin(); I.end() == false; I++) if ((I->Flags & pkgCache::Flag::Essential) == pkgCache::Flag::Essential) Cache.MarkInstall(I,true); /* We do it again over all previously installed packages to force conflict resolution on them all. */ for (pkgCache::PkgIterator I = Cache.PkgBegin(); I.end() == false; I++) if (I->CurrentVer != 0) Cache.MarkInstall(I,false); pkgProblemResolver Fix(Cache); // Hold back held packages. if (_config->FindB("APT::Ingore-Hold",false) == false) { for (pkgCache::PkgIterator I = Cache.PkgBegin(); I.end() == false; I++) { if (I->SelectedState == pkgCache::State::Hold) { Fix.Protect(I); Cache.MarkKeep(I); } } } return Fix.Resolve(); } /*}}}*/ // AllUpgrade - Upgrade as many packages as possible /*{{{*/ // --------------------------------------------------------------------- /* Right now the system must be consistent before this can be called. It also will not change packages marked for install, it only tries to install packages not marked for install */ bool pkgAllUpgrade(pkgDepCache &Cache) { pkgProblemResolver Fix(Cache); if (Cache.BrokenCount() != 0) return false; // Upgrade all installed packages for (pkgCache::PkgIterator I = Cache.PkgBegin(); I.end() == false; I++) { if (Cache[I].Install() == true) Fix.Protect(I); if (_config->FindB("APT::Ingore-Hold",false) == false) if (I->SelectedState == pkgCache::State::Hold) continue; if (I->CurrentVer != 0 && Cache[I].InstallVer != 0) Cache.MarkInstall(I,false); } return Fix.ResolveByKeep(); } /*}}}*/ // MinimizeUpgrade - Minimizes the set of packages to be upgraded /*{{{*/ // --------------------------------------------------------------------- /* This simply goes over the entire set of packages and tries to keep each package marked for upgrade. If a conflict is generated then the package is restored. */ bool pkgMinimizeUpgrade(pkgDepCache &Cache) { if (Cache.BrokenCount() != 0) return false; // We loop indefinately to get the minimal set size. bool Change = false; do { Change = false; for (pkgCache::PkgIterator I = Cache.PkgBegin(); I.end() == false; I++) { // Not interesting if (Cache[I].Upgrade() == false || Cache[I].NewInstall() == true) continue; // Keep it and see if that is OK Cache.MarkKeep(I); if (Cache.BrokenCount() != 0) Cache.MarkInstall(I,false); else Change = true; } } while (Change == true); if (Cache.BrokenCount() != 0) return _error->Error("Internal Error in pkgMinimizeUpgrade"); return true; } /*}}}*/ // ProblemResolver::pkgProblemResolver - Constructor /*{{{*/ // --------------------------------------------------------------------- /* */ pkgProblemResolver::pkgProblemResolver(pkgDepCache &Cache) : Cache(Cache) { // Allocate memory unsigned long Size = Cache.HeaderP->PackageCount; Scores = new signed short[Size]; Flags = new unsigned char[Size]; memset(Flags,0,sizeof(*Flags)*Size); // Set debug to true to see its decision logic Debug = _config->FindB("Debug::pkgProblemResolver",false); } /*}}}*/ // ProblemResolver::ScoreSort - Sort the list by score /*{{{*/ // --------------------------------------------------------------------- /* */ int pkgProblemResolver::ScoreSort(const void *a,const void *b) { Package const **A = (Package const **)a; Package const **B = (Package const **)b; if (This->Scores[(*A)->ID] > This->Scores[(*B)->ID]) return -1; if (This->Scores[(*A)->ID] < This->Scores[(*B)->ID]) return 1; return 0; } /*}}}*/ // ProblemResolver::MakeScores - Make the score table /*{{{*/ // --------------------------------------------------------------------- /* */ void pkgProblemResolver::MakeScores() { unsigned long Size = Cache.HeaderP->PackageCount; memset(Scores,0,sizeof(*Scores)*Size); // Generate the base scores for a package based on its properties for (pkgCache::PkgIterator I = Cache.PkgBegin(); I.end() == false; I++) { if (Cache[I].InstallVer == 0) continue; signed short &Score = Scores[I->ID]; /* This is arbitary, it should be high enough to elevate an essantial package above most other packages but low enough to allow an obsolete essential packages to be removed by a conflicts on a powerfull normal package (ie libc6) */ if ((I->Flags & pkgCache::Flag::Essential) == pkgCache::Flag::Essential) Score += 100; // We transform the priority // Important Required Standard Optional Extra signed short PrioMap[] = {0,3,2,1,-1,-2}; if (Cache[I].InstVerIter(Cache)->Priority <= 5) Score += PrioMap[Cache[I].InstVerIter(Cache)->Priority]; /* This helps to fix oddball problems with conflicting packages on the same level. We enhance the score of installed packages */ if (I->CurrentVer != 0) Score += 1; } // Now that we have the base scores we go and propogate dependencies for (pkgCache::PkgIterator I = Cache.PkgBegin(); I.end() == false; I++) { if (Cache[I].InstallVer == 0) continue; for (pkgCache::DepIterator D = Cache[I].InstVerIter(Cache).DependsList(); D.end() == false; D++) { if (D->Type == pkgCache::Dep::Depends || D->Type == pkgCache::Dep::PreDepends) Scores[D.TargetPkg()->ID]++; } } // Copy the scores to advoid additive looping signed short *OldScores = new signed short[Size]; memcpy(OldScores,Scores,sizeof(*Scores)*Size); /* Now we cause 1 level of dependency inheritance, that is we add the score of the packages that depend on the target Package. This fortifies high scoring packages */ for (pkgCache::PkgIterator I = Cache.PkgBegin(); I.end() == false; I++) { if (Cache[I].InstallVer == 0) continue; for (pkgCache::DepIterator D = I.RevDependsList(); D.end() == false; D++) { // Only do it for the install version if ((pkgCache::Version *)D.ParentVer() != Cache[D.ParentPkg()].InstallVer || (D->Type != pkgCache::Dep::Depends && D->Type != pkgCache::Dep::PreDepends)) continue; Scores[I->ID] += abs(OldScores[D.ParentPkg()->ID]); } } /* Now we propogate along provides. This makes the packages that provide important packages extremely important */ for (pkgCache::PkgIterator I = Cache.PkgBegin(); I.end() == false; I++) { for (pkgCache::PrvIterator P = I.ProvidesList(); P.end() == false; P++) { // Only do it once per package if ((pkgCache::Version *)P.OwnerVer() != Cache[P.OwnerPkg()].InstallVer) continue; Scores[P.OwnerPkg()->ID] += abs(Scores[I->ID] - OldScores[I->ID]); } } /* Protected things are pushed really high up. This number should put them ahead of everything */ for (pkgCache::PkgIterator I = Cache.PkgBegin(); I.end() == false; I++) { if ((Flags[I->ID] & Protected) != 0) Scores[I->ID] += 10000; if ((I->Flags & pkgCache::Flag::Essential) == pkgCache::Flag::Essential) Scores[I->ID] += 5000; } delete [] OldScores; } /*}}}*/ // ProblemResolver::DoUpgrade - Attempt to upgrade this package /*{{{*/ // --------------------------------------------------------------------- /* This goes through and tries to reinstall packages to make this package installable */ bool pkgProblemResolver::DoUpgrade(pkgCache::PkgIterator Pkg) { if ((Flags[Pkg->ID] & Upgradable) == 0 || Cache[Pkg].Upgradable() == false) return false; Flags[Pkg->ID] &= ~Upgradable; bool WasKept = Cache[Pkg].Keep(); Cache.MarkInstall(Pkg,false); // This must be a virtual package or something like that. if (Cache[Pkg].InstVerIter(Cache).end() == true) return false; // Isolate the problem dependency bool Fail = false; for (pkgCache::DepIterator D = Cache[Pkg].InstVerIter(Cache).DependsList(); D.end() == false;) { // Compute a single dependency element (glob or) pkgCache::DepIterator Start = D; pkgCache::DepIterator End = D; unsigned char State = 0; for (bool LastOR = true; D.end() == false && LastOR == true; D++) { State |= Cache[D]; LastOR = (D->CompareOp & pkgCache::Dep::Or) == pkgCache::Dep::Or; if (LastOR == true) End = D; } // We only worry about critical deps. if (End.IsCritical() != true) continue; // Dep is ok if ((Cache[End] & pkgDepCache::DepGInstall) == pkgDepCache::DepGInstall) continue; // Hm, the group is broken.. I have no idea how to handle this if (Start != End) { clog << "Note, a broken or group was found in " << Pkg.Name() << "." << endl; Fail = true; break; } // Do not change protected packages PkgIterator P = Start.SmartTargetPkg(); if ((Flags[P->ID] & Protected) == Protected) { if (Debug == true) clog << " Reinet Failed because of protected " << P.Name() << endl; Fail = true; break; } // Upgrade the package if the candidate version will fix the problem. if ((Cache[Start] & pkgDepCache::DepCVer) == pkgDepCache::DepCVer) { if (DoUpgrade(P) == false) { if (Debug == true) clog << " Reinst Failed because of " << P.Name() << endl; Fail = true; break; } } else { /* We let the algorithm deal with conflicts on its next iteration, it is much smarter than us */ if (End->Type == pkgCache::Dep::Conflicts) continue; if (Debug == true) clog << " Reinst Failed early because of " << Start.TargetPkg().Name() << endl; Fail = true; break; } } // Undo our operations - it might be smart to undo everything this did.. if (Fail == true) { if (WasKept == true) Cache.MarkKeep(Pkg); else Cache.MarkDelete(Pkg); return false; } if (Debug == true) clog << " Re-Instated " << Pkg.Name() << endl; return true; } /*}}}*/ // ProblemResolver::Resolve - Run the resolution pass /*{{{*/ // --------------------------------------------------------------------- /* This routines works by calculating a score for each package. The score is derived by considering the package's priority and all reverse dependents giving an integer that reflects the amount of breakage that adjusting the package will inflict. It goes from highest score to lowest and corrects all of the breaks by keeping or removing the dependant packages. If that fails then it removes the package itself and goes on. The routine should be able to intelligently go from any broken state to a fixed state. The BrokenFix flag enables a mode where the algorithm tries to upgrade packages to advoid problems. */ bool pkgProblemResolver::Resolve(bool BrokenFix) { unsigned long Size = Cache.HeaderP->PackageCount; // Record which packages are marked for install bool Again = false; do { Again = false; for (pkgCache::PkgIterator I = Cache.PkgBegin(); I.end() == false; I++) { if (Cache[I].Install() == true) Flags[I->ID] |= PreInstalled; else { if (Cache[I].InstBroken() == true && BrokenFix == true) { Cache.MarkInstall(I,false); if (Cache[I].Install() == true) Again = true; } Flags[I->ID] &= ~PreInstalled; } Flags[I->ID] |= Upgradable; } } while (Again == true); if (Debug == true) clog << "Starting" << endl; MakeScores(); /* We have to order the packages so that the broken fixing pass operates from highest score to lowest. This prevents problems when high score packages cause the removal of lower score packages that would cause the removal of even lower score packages. */ pkgCache::Package **PList = new pkgCache::Package *[Size]; pkgCache::Package **PEnd = PList; for (pkgCache::PkgIterator I = Cache.PkgBegin(); I.end() == false; I++) *PEnd++ = I; This = this; qsort(PList,PEnd - PList,sizeof(*PList),&ScoreSort); /* for (pkgCache::Package **K = PList; K != PEnd; K++) if (Scores[(*K)->ID] != 0) { pkgCache::PkgIterator Pkg(Cache,*K); clog << Scores[(*K)->ID] << ' ' << Pkg.Name() << ' ' << (pkgCache::Version *)Pkg.CurrentVer() << ' ' << Cache[Pkg].InstallVer << ' ' << Cache[Pkg].CandidateVer << endl; } */ if (Debug == true) clog << "Starting 2" << endl; /* Now consider all broken packages. For each broken package we either remove the package or fix it's problem. We do this once, it should not be possible for a loop to form (that is a < b < c and fixing b by changing a breaks c) */ bool Change = true; for (int Counter = 0; Counter != 10 && Change == true; Counter++) { Change = false; for (pkgCache::Package **K = PList; K != PEnd; K++) { pkgCache::PkgIterator I(Cache,*K); /* We attempt to install this and see if any breaks result, this takes care of some strange cases */ if (Cache[I].CandidateVer != Cache[I].InstallVer && I->CurrentVer != 0 && Cache[I].InstallVer != 0 && (Flags[I->ID] & PreInstalled) != 0 && (Flags[I->ID] & Protected) == 0 && (Flags[I->ID] & ReInstateTried) == 0) { if (Debug == true) clog << " Try to Re-Instate " << I.Name() << endl; unsigned long OldBreaks = Cache.BrokenCount(); pkgCache::Version *OldVer = Cache[I].InstallVer; Flags[I->ID] &= ReInstateTried; Cache.MarkInstall(I,false); if (Cache[I].InstBroken() == true || OldBreaks < Cache.BrokenCount()) { if (OldVer == 0) Cache.MarkDelete(I); else Cache.MarkKeep(I); } else if (Debug == true) clog << "Re-Instated " << I.Name() << " (" << OldBreaks << " vs " << Cache.BrokenCount() << ')' << endl; } if (Cache[I].InstallVer == 0 || Cache[I].InstBroken() == false) continue; // Isolate the problem dependency PackageKill KillList[100]; PackageKill *LEnd = KillList; for (pkgCache::DepIterator D = Cache[I].InstVerIter(Cache).DependsList(); D.end() == false;) { // Compute a single dependency element (glob or) pkgCache::DepIterator Start; pkgCache::DepIterator End; D.GlobOr(Start,End); // We only worry about critical deps. if (End.IsCritical() != true) continue; // Dep is ok if ((Cache[End] & pkgDepCache::DepGInstall) == pkgDepCache::DepGInstall) continue; // Hm, the group is broken.. I have no idea how to handle this if (Start != End) { if (Debug == true) clog << "Note, a broken or group was found in " << I.Name() << "." << endl; if ((Flags[I->ID] & Protected) != Protected) Cache.MarkDelete(I); break; } if (Debug == true) clog << "Package " << I.Name() << " has broken dep on " << End.TargetPkg().Name() << endl; /* Look across the version list. If there are no possible targets then we keep the package and bail. This is necessary if a package has a dep on another package that cant be found */ pkgCache::Version **VList = End.AllTargets(); if (*VList == 0 && (Flags[I->ID] & Protected) != Protected && End->Type != pkgCache::Dep::Conflicts && Cache[I].NowBroken() == false) { Change = true; Cache.MarkKeep(I); break; } bool Done = false; for (pkgCache::Version **V = VList; *V != 0; V++) { pkgCache::VerIterator Ver(Cache,*V); pkgCache::PkgIterator Pkg = Ver.ParentPkg(); if (Debug == true) clog << " Considering " << Pkg.Name() << ' ' << (int)Scores[Pkg->ID] << " as a solution to " << I.Name() << ' ' << (int)Scores[I->ID] << endl; if (Scores[I->ID] <= Scores[Pkg->ID] || ((Cache[End] & pkgDepCache::DepGNow) == 0 && End->Type != pkgCache::Dep::Conflicts)) { if ((Flags[I->ID] & Protected) == Protected) continue; // See if a keep will do Cache.MarkKeep(I); if (Cache[I].InstBroken() == false) { if (Debug == true) clog << " Holding Back " << I.Name() << " rather than change " << End.TargetPkg().Name() << endl; } else { if (BrokenFix == false || DoUpgrade(I) == false) { if (Debug == true) clog << " Removing " << I.Name() << " rather than change " << End.TargetPkg().Name() << endl; Cache.MarkDelete(I); if (Counter > 1) Scores[I->ID] = Scores[Pkg->ID]; } } Change = true; Done = true; break; } else { // Skip this if it is protected if ((Flags[Pkg->ID] & Protected) != 0) continue; LEnd->Pkg = Pkg; LEnd->Dep = End; LEnd++; if (End->Type != pkgCache::Dep::Conflicts) break; } } // Hm, nothing can possibly satisify this dep. Nuke it. if (VList[0] == 0 && End->Type != pkgCache::Dep::Conflicts && (Flags[I->ID] & Protected) != Protected) { Cache.MarkKeep(I); if (Cache[I].InstBroken() == false) { if (Debug == true) clog << " Holding Back " << I.Name() << " because I can't find " << End.TargetPkg().Name() << endl; } else { if (Debug == true) clog << " Removing " << I.Name() << " because I can't find " << End.TargetPkg().Name() << endl; Cache.MarkDelete(I); } Change = true; Done = true; } delete [] VList; if (Done == true) break; } // Apply the kill list now if (Cache[I].InstallVer != 0) for (PackageKill *J = KillList; J != LEnd; J++) { Change = true; if ((Cache[J->Dep] & pkgDepCache::DepGNow) == 0) { if (J->Dep->Type == pkgCache::Dep::Conflicts) { if (Debug == true) clog << " Fixing " << I.Name() << " via remove of " << J->Pkg.Name() << endl; Cache.MarkDelete(J->Pkg); } } else { if (Debug == true) clog << " Fixing " << I.Name() << " via keep of " << J->Pkg.Name() << endl; Cache.MarkKeep(J->Pkg); } if (Counter > 1) Scores[J->Pkg->ID] = Scores[I->ID]; } } } if (Debug == true) clog << "Done" << endl; delete [] Scores; delete [] PList; if (Cache.BrokenCount() != 0) return _error->Error("Internal error, pkgProblemResolver::Resolve generated breaks."); return true; } /*}}}*/ // ProblemResolver::ResolveByKeep - Resolve problems using keep /*{{{*/ // --------------------------------------------------------------------- /* This is the work horse of the soft upgrade routine. It is very gental in that it does not install or remove any packages. It is assumed that the system was non-broken previously. */ bool pkgProblemResolver::ResolveByKeep() { unsigned long Size = Cache.HeaderP->PackageCount; if (Debug == true) clog << "Entering ResolveByKeep" << endl; MakeScores(); /* We have to order the packages so that the broken fixing pass operates from highest score to lowest. This prevents problems when high score packages cause the removal of lower score packages that would cause the removal of even lower score packages. */ pkgCache::Package **PList = new pkgCache::Package *[Size]; pkgCache::Package **PEnd = PList; for (pkgCache::PkgIterator I = Cache.PkgBegin(); I.end() == false; I++) *PEnd++ = I; This = this; qsort(PList,PEnd - PList,sizeof(*PList),&ScoreSort); // Consider each broken package pkgCache::Package **LastStop = 0; for (pkgCache::Package **K = PList; K != PEnd; K++) { pkgCache::PkgIterator I(Cache,*K); if (Cache[I].InstallVer == 0 || Cache[I].InstBroken() == false) continue; /* Keep the package. If this works then great, otherwise we have to be significantly more agressive and manipulate its dependencies */ if ((Flags[I->ID] & Protected) == 0) { if (Debug == true) clog << "Keeping package " << I.Name() << endl; Cache.MarkKeep(I); if (Cache[I].InstBroken() == false) { K = PList; continue; } } // Isolate the problem dependencies for (pkgCache::DepIterator D = Cache[I].InstVerIter(Cache).DependsList(); D.end() == false;) { // Compute a single dependency element (glob or) pkgCache::DepIterator Start = D; pkgCache::DepIterator End = D; unsigned char State = 0; for (bool LastOR = true; D.end() == false && LastOR == true; D++) { State |= Cache[D]; LastOR = (D->CompareOp & pkgCache::Dep::Or) == pkgCache::Dep::Or; if (LastOR == true) End = D; } // We only worry about critical deps. if (End.IsCritical() != true) continue; // Dep is ok if ((Cache[End] & pkgDepCache::DepGInstall) == pkgDepCache::DepGInstall) continue; // Hm, the group is broken.. I have no idea how to handle this if (Start != End) { clog << "Note, a broken or group was found in " << I.Name() << "." << endl; if ((Flags[I->ID] & Protected) == 0) Cache.MarkKeep(I); break; } if (Debug == true) clog << "Package " << I.Name() << " has broken dep on " << End.TargetPkg().Name() << endl; // Look at all the possible provides on this package pkgCache::Version **VList = End.AllTargets(); for (pkgCache::Version **V = VList; *V != 0; V++) { pkgCache::VerIterator Ver(Cache,*V); pkgCache::PkgIterator Pkg = Ver.ParentPkg(); // It is not keepable if (Cache[Pkg].InstallVer == 0 || Pkg->CurrentVer == 0) continue; if ((Flags[I->ID] & Protected) == 0) { if (Debug == true) clog << " Keeping Package " << Pkg.Name() << " due to dep" << endl; Cache.MarkKeep(Pkg); } if (Cache[I].InstBroken() == false) break; } if (Cache[I].InstBroken() == false) break; } if (Cache[I].InstBroken() == true) continue; // Restart again. if (K == LastStop) return _error->Error("Internal Error, pkgProblemResolver::ResolveByKeep is looping on package %s.",I.Name()); LastStop = K; K = PList; } return true; } /*}}}*/ // ProblemResolver::InstallProtect - Install all protected packages /*{{{*/ // --------------------------------------------------------------------- /* This is used to make sure protected packages are installed */ void pkgProblemResolver::InstallProtect() { for (pkgCache::PkgIterator I = Cache.PkgBegin(); I.end() == false; I++) { if ((Flags[I->ID] & Protected) == Protected) { if ((Flags[I->ID] & ToRemove) == ToRemove) Cache.MarkDelete(I); else Cache.MarkInstall(I,false); } } } /*}}}*/