X-Git-Url: https://git.saurik.com/apt.git/blobdiff_plain/5abee4863220c2d9b135dc832b33c8680e5ba12e..3a487cc03dec3488d0fa3008d04747bb1b4b0baf:/apt-pkg/policy.cc diff --git a/apt-pkg/policy.cc b/apt-pkg/policy.cc index b47dab90c..2bdd96d8c 100644 --- a/apt-pkg/policy.cc +++ b/apt-pkg/policy.cc @@ -4,22 +4,12 @@ /* ###################################################################### Package Version Policy implementation - + This is just a really simple wrapper around pkgVersionMatch with some added goodies to manage the list of things.. - - Priority Table: - - 1000 -> inf = Downgradeable priorities - 1000 = The 'no downgrade' pseduo-status file - 100 -> 1000 = Standard priorities - 990 = Config file override package files - 989 = Start for preference auto-priorities - 500 = Default package files - 100 = The status file and ButAutomaticUpgrades sources - 0 -> 100 = NotAutomatic sources like experimental - -inf -> 0 = Never selected - + + See man apt_preferences for what value means what. + ##################################################################### */ /*}}}*/ // Include Files /*{{{*/ @@ -27,12 +17,21 @@ #include #include +#include #include #include #include #include -#include +#include +#include +#include +#include +#include +#include +#include +#include +#include #include #include @@ -45,15 +44,19 @@ using namespace std; // --------------------------------------------------------------------- /* Set the defaults for operation. The default mode with no loaded policy file matches the V0 policy engine. */ -pkgPolicy::pkgPolicy(pkgCache *Owner) : Pins(0), PFPriority(0), Cache(Owner) +pkgPolicy::pkgPolicy(pkgCache *Owner) : Pins(nullptr), VerPins(nullptr), + PFPriority(nullptr), Cache(Owner), d(NULL) { - if (Owner == 0 || &(Owner->Head()) == 0) + if (Owner == 0) return; PFPriority = new signed short[Owner->Head().PackageFileCount]; Pins = new Pin[Owner->Head().PackageCount]; + VerPins = new Pin[Owner->Head().VersionCount]; for (unsigned long I = 0; I != Owner->Head().PackageCount; I++) Pins[I].Type = pkgVersionMatch::None; + for (unsigned long I = 0; I != Owner->Head().VersionCount; I++) + VerPins[I].Type = pkgVersionMatch::None; // The config file has a master override. string DefRel = _config->Find("APT::Default-Release"); @@ -64,9 +67,9 @@ pkgPolicy::pkgPolicy(pkgCache *Owner) : Pins(0), PFPriority(0), Cache(Owner) pkgVersionMatch vm("", pkgVersionMatch::None); for (pkgCache::PkgFileIterator F = Cache->FileBegin(); F != Cache->FileEnd(); ++F) { - if ((F->Archive != 0 && vm.ExpressionMatches(DefRel, F.Archive()) == true) || - (F->Codename != 0 && vm.ExpressionMatches(DefRel, F.Codename()) == true) || - (F->Version != 0 && vm.ExpressionMatches(DefRel, F.Version()) == true) || + if (vm.ExpressionMatches(DefRel, F.Archive()) || + vm.ExpressionMatches(DefRel, F.Codename()) || + vm.ExpressionMatches(DefRel, F.Version()) || (DefRel.length() > 2 && DefRel[1] == '=')) found = true; } @@ -87,48 +90,40 @@ bool pkgPolicy::InitDefaults() for (pkgCache::PkgFileIterator I = Cache->FileBegin(); I != Cache->FileEnd(); ++I) { PFPriority[I->ID] = 500; - if ((I->Flags & pkgCache::Flag::NotSource) == pkgCache::Flag::NotSource) + if (I.Flagged(pkgCache::Flag::NotSource)) PFPriority[I->ID] = 100; - else if ((I->Flags & pkgCache::Flag::ButAutomaticUpgrades) == pkgCache::Flag::ButAutomaticUpgrades) + else if (I.Flagged(pkgCache::Flag::ButAutomaticUpgrades)) PFPriority[I->ID] = 100; - else if ((I->Flags & pkgCache::Flag::NotAutomatic) == pkgCache::Flag::NotAutomatic) + else if (I.Flagged(pkgCache::Flag::NotAutomatic)) PFPriority[I->ID] = 1; } // Apply the defaults.. - SPtrArray Fixed = new bool[Cache->HeaderP->PackageFileCount]; - memset(Fixed,0,sizeof(*Fixed)*Cache->HeaderP->PackageFileCount); - signed Cur = 989; + std::unique_ptr Fixed(new bool[Cache->HeaderP->PackageFileCount]); + memset(Fixed.get(),0,sizeof(Fixed[0])*Cache->HeaderP->PackageFileCount); StatusOverride = false; - for (vector::const_iterator I = Defaults.begin(); I != Defaults.end(); - ++I, --Cur) + for (vector::const_iterator I = Defaults.begin(); I != Defaults.end(); ++I) { pkgVersionMatch Match(I->Data,I->Type); for (pkgCache::PkgFileIterator F = Cache->FileBegin(); F != Cache->FileEnd(); ++F) { - if (Match.FileMatch(F) == true && Fixed[F->ID] == false) + if (Fixed[F->ID] == false && Match.FileMatch(F) == true) { - if (I->Priority != 0 && I->Priority > 0) - Cur = I->Priority; - - if (I->Priority < 0) - PFPriority[F->ID] = I->Priority; - else - PFPriority[F->ID] = Cur; - - if (PFPriority[F->ID] > 1000) + PFPriority[F->ID] = I->Priority; + + if (PFPriority[F->ID] >= 1000) StatusOverride = true; - + Fixed[F->ID] = true; - } - } + } + } } if (_config->FindB("Debug::pkgPolicy",false) == true) for (pkgCache::PkgFileIterator F = Cache->FileBegin(); F != Cache->FileEnd(); ++F) - std::clog << "Prio of " << F.FileName() << ' ' << PFPriority[F->ID] << std::endl; - - return true; + std::clog << "Prio of " << F.FileName() << ' ' << PFPriority[F->ID] << std::endl; + + return true; } /*}}}*/ // Policy::GetCandidateVer - Get the candidate install version /*{{{*/ @@ -137,83 +132,27 @@ bool pkgPolicy::InitDefaults() best package is. */ pkgCache::VerIterator pkgPolicy::GetCandidateVer(pkgCache::PkgIterator const &Pkg) { - // Look for a package pin and evaluate it. - signed Max = GetPriority(Pkg); - pkgCache::VerIterator Pref = GetMatch(Pkg); - - // Alternatives in case we can not find our package pin (Bug#512318). - signed MaxAlt = 0; - pkgCache::VerIterator PrefAlt; - - // no package = no candidate version - if (Pkg.end() == true) - return Pref; - - // packages with a pin lower than 0 have no newer candidate than the current version - if (Max < 0) - return Pkg.CurrentVer(); - - /* Falling through to the default version.. Setting Max to zero - effectively excludes everything <= 0 which are the non-automatic - priorities.. The status file is given a prio of 100 which will exclude - not-automatic sources, except in a single shot not-installed mode. - The second pseduo-status file is at prio 1000, above which will permit - the user to force-downgrade things. - - The user pin is subject to the same priority rules as default - selections. Thus there are two ways to create a pin - a pin that - tracks the default when the default is taken away, and a permanent - pin that stays at that setting. - */ - for (pkgCache::VerIterator Ver = Pkg.VersionList(); Ver.end() == false; ++Ver) - { - /* Lets see if this version is the installed version */ - bool instVer = (Pkg.CurrentVer() == Ver); + pkgCache::VerIterator cand; + pkgCache::VerIterator cur = Pkg.CurrentVer(); + int candPriority = -1; + pkgVersioningSystem *vs = Cache->VS; - for (pkgCache::VerFileIterator VF = Ver.FileList(); VF.end() == false; ++VF) - { - /* If this is the status file, and the current version is not the - version in the status file (ie it is not installed, or somesuch) - then it is not a candidate for installation, ever. This weeds - out bogus entries that may be due to config-file states, or - other. */ - if ((VF.File()->Flags & pkgCache::Flag::NotSource) == pkgCache::Flag::NotSource && - instVer == false) - continue; + for (pkgCache::VerIterator ver = Pkg.VersionList(); ver.end() == false; ++ver) { + int priority = GetPriority(ver, true); - signed Prio = PFPriority[VF.File()->ID]; - if (Prio > Max) - { - Pref = Ver; - Max = Prio; - } - if (Prio > MaxAlt) - { - PrefAlt = Ver; - MaxAlt = Prio; - } - } - - if (instVer == true && Max < 1000) - { - /* Elevate our current selection (or the status file itself) - to the Pseudo-status priority. */ - if (Pref.end() == true) - Pref = Ver; - Max = 1000; - - // Fast path optimize. - if (StatusOverride == false) - break; - } + if (priority == 0 || priority <= candPriority) + continue; + + // TODO: Maybe optimize to not compare versions + if (!cur.end() && priority < 1000 + && (vs->CmpVersion(ver.VerStr(), cur.VerStr()) < 0)) + continue; + + candPriority = priority; + cand = ver; } - // If we do not find our candidate, use the one with the highest pin. - // This means that if there is a version available with pin > 0; there - // will always be a candidate (Closes: #512318) - if (!Pref.IsGood() && MaxAlt > 0) - Pref = PrefAlt; - return Pref; + return cand; } /*}}}*/ // Policy::CreatePin - Create an entry in the pin table.. /*{{{*/ @@ -259,17 +198,44 @@ void pkgPolicy::CreatePin(pkgVersionMatch::MatchType Type,string Name, } // find the package (group) this pin applies to - pkgCache::GrpIterator Grp; - pkgCache::PkgIterator Pkg; - if (Arch.empty() == false) - Pkg = Cache->FindPkg(Name, Arch); - else { - Grp = Cache->FindGrp(Name); - if (Grp.end() == false) - Pkg = Grp.PackageList(); + pkgCache::GrpIterator Grp = Cache->FindGrp(Name); + bool matched = false; + if (Grp.end() == false) + { + std::string MatchingArch; + if (Arch.empty() == true) + MatchingArch = Cache->NativeArch(); + else + MatchingArch = Arch; + APT::CacheFilter::PackageArchitectureMatchesSpecification pams(MatchingArch); + for (pkgCache::PkgIterator Pkg = Grp.PackageList(); Pkg.end() != true; Pkg = Grp.NextPkg(Pkg)) + { + if (pams(Pkg.Arch()) == false) + continue; + Pin *P = Pins + Pkg->ID; + // the first specific stanza for a package is the ruler, + // all others need to be ignored + if (P->Type != pkgVersionMatch::None) + P = &*Unmatched.insert(Unmatched.end(),PkgPin(Pkg.FullName())); + P->Type = Type; + P->Priority = Priority; + P->Data = Data; + matched = true; + + // Find matching version(s) and copy the pin into it + pkgVersionMatch Match(P->Data,P->Type); + for (pkgCache::VerIterator Ver = Pkg.VersionList(); Ver.end() != true; ++Ver) + { + if (Match.VersionMatches(Ver)) { + Pin *VP = VerPins + Ver->ID; + if (VP->Type == pkgVersionMatch::None) + *VP = *P; + } + } + } } - if (Pkg.end() == true) + if (matched == false) { PkgPin *P = &*Unmatched.insert(Unmatched.end(),PkgPin(Name)); if (Arch.empty() == false) @@ -279,20 +245,6 @@ void pkgPolicy::CreatePin(pkgVersionMatch::MatchType Type,string Name, P->Data = Data; return; } - - for (; Pkg.end() != true; Pkg = Grp.NextPkg(Pkg)) - { - Pin *P = Pins + Pkg->ID; - // the first specific stanza for a package is the ruler, - // all others need to be ignored - if (P->Type != pkgVersionMatch::None) - P = &*Unmatched.insert(Unmatched.end(),PkgPin(Pkg.FullName())); - P->Type = Type; - P->Priority = Priority; - P->Data = Data; - if (Grp.end() == true) - break; - } } /*}}}*/ // Policy::GetMatch - Get the matching version for a package pin /*{{{*/ @@ -311,37 +263,40 @@ pkgCache::VerIterator pkgPolicy::GetMatch(pkgCache::PkgIterator const &Pkg) // Policy::GetPriority - Get the priority of the package pin /*{{{*/ // --------------------------------------------------------------------- /* */ -signed short pkgPolicy::GetPriority(pkgCache::PkgIterator const &Pkg) +APT_PURE signed short pkgPolicy::GetPriority(pkgCache::PkgIterator const &Pkg) { if (Pins[Pkg->ID].Type != pkgVersionMatch::None) - { - // In this case 0 means default priority - if (Pins[Pkg->ID].Priority == 0) - return 989; return Pins[Pkg->ID].Priority; - } - return 0; } -signed short pkgPolicy::GetPriority(pkgCache::PkgFileIterator const &File) +APT_PURE signed short pkgPolicy::GetPriority(pkgCache::VerIterator const &Ver, bool ConsiderFiles) { - return PFPriority[File->ID]; -} - /*}}}*/ -// PreferenceSection class - Overriding the default TrimRecord method /*{{{*/ -// --------------------------------------------------------------------- -/* The preference file is a user generated file so the parser should - therefore be a bit more friendly by allowing comments and new lines - all over the place rather than forcing a special format */ -class PreferenceSection : public pkgTagSection -{ - void TrimRecord(bool BeforeRecord, const char* &End) + if (VerPins[Ver->ID].Type != pkgVersionMatch::None) + return VerPins[Ver->ID].Priority; + if (!ConsiderFiles) + return 0; + + // priorities are short ints, but we want to pick a value outside the valid range here + auto priority = std::numeric_limits::min(); + for (pkgCache::VerFileIterator file = Ver.FileList(); file.end() == false; file++) { - for (; Stop < End && (Stop[0] == '\n' || Stop[0] == '\r' || Stop[0] == '#'); Stop++) - if (Stop[0] == '#') - Stop = (const char*) memchr(Stop,'\n',End-Stop); + /* If this is the status file, and the current version is not the + version in the status file (ie it is not installed, or somesuch) + then it is not a candidate for installation, ever. This weeds + out bogus entries that may be due to config-file states, or + other. */ + if (file.File().Flagged(pkgCache::Flag::NotSource) && Ver.ParentPkg().CurrentVer() != Ver) + priority = std::max(priority, static_cast(-1)); + else + priority = std::max(priority, static_cast(GetPriority(file.File()))); } -}; + + return priority == std::numeric_limits::min() ? 0 : priority; +} +APT_PURE signed short pkgPolicy::GetPriority(pkgCache::PkgFileIterator const &File) +{ + return PFPriority[File->ID]; +} /*}}}*/ // ReadPinDir - Load the pin files from this dir into a Policy /*{{{*/ // --------------------------------------------------------------------- @@ -356,11 +311,17 @@ bool ReadPinDir(pkgPolicy &Plcy,string Dir) if (DirectoryExists(Dir) == false) { - _error->WarningE("DirectoryExists",_("Unable to read %s"),Dir.c_str()); + if (Dir != "/dev/null") + _error->WarningE("DirectoryExists",_("Unable to read %s"),Dir.c_str()); return true; } + _error->PushToStack(); vector const List = GetListOfFilesInDir(Dir, "pref", true, true); + bool const PendingErrors = _error->PendingError(); + _error->MergeWithStack(); + if (PendingErrors) + return false; // Read the files for (vector::const_iterator I = List.begin(); I != List.end(); ++I) @@ -384,13 +345,17 @@ bool ReadPinFile(pkgPolicy &Plcy,string File) return true; FileFd Fd(File,FileFd::ReadOnly); - pkgTagFile TF(&Fd); - if (_error->PendingError() == true) + pkgTagFile TF(&Fd, pkgTagFile::SUPPORT_COMMENTS); + if (Fd.IsOpen() == false || Fd.Failed()) return false; - - PreferenceSection Tags; + + pkgTagSection Tags; while (TF.Step(Tags) == true) { + // can happen when there are only comments in a record + if (Tags.Count() == 0) + continue; + string Name = Tags.FindS("Package"); if (Name.empty() == true) return _error->Error(_("Invalid record in the preferences file %s, no Package header"), File.c_str()); @@ -420,11 +385,21 @@ bool ReadPinFile(pkgPolicy &Plcy,string File) } for (; Word != End && isspace(*Word) != 0; Word++); - short int priority = Tags.FindI("Pin-Priority", 0); + _error->PushToStack(); + int const priority = Tags.FindI("Pin-Priority", 0); + bool const newError = _error->PendingError(); + _error->MergeWithStack(); + if (priority < std::numeric_limits::min() || + priority > std::numeric_limits::max() || + newError) { + return _error->Error(_("%s: Value %s is outside the range of valid pin priorities (%d to %d)"), + File.c_str(), Tags.FindS("Pin-Priority").c_str(), + std::numeric_limits::min(), + std::numeric_limits::max()); + } if (priority == 0) { - _error->Warning(_("No priority (or zero) specified for pin")); - continue; + return _error->Error(_("No priority (or zero) specified for pin")); } istringstream s(Name); @@ -440,3 +415,5 @@ bool ReadPinFile(pkgPolicy &Plcy,string File) return true; } /*}}}*/ + +pkgPolicy::~pkgPolicy() {delete [] PFPriority; delete [] Pins; delete [] VerPins; }