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Diffstat (limited to 'apt-pkg/pkgcache.cc')
| -rw-r--r-- | apt-pkg/pkgcache.cc | 1075 |
1 files changed, 1075 insertions, 0 deletions
diff --git a/apt-pkg/pkgcache.cc b/apt-pkg/pkgcache.cc new file mode 100644 index 000000000..b4c232f8c --- /dev/null +++ b/apt-pkg/pkgcache.cc @@ -0,0 +1,1075 @@ +// -*- mode: cpp; mode: fold -*- +// Description /*{{{*/ +// $Id: pkgcache.cc,v 1.37 2003/02/10 01:40:58 doogie Exp $ +/* ###################################################################### + + Package Cache - Accessor code for the cache + + Please see doc/apt-pkg/cache.sgml for a more detailed description of + this format. Also be sure to keep that file up-to-date!! + + This is the general utility functions for cache management. They provide + a complete set of accessor functions for the cache. The cacheiterators + header contains the STL-like iterators that can be used to easially + navigate the cache as well as seemlessly dereference the mmap'd + indexes. Use these always. + + The main class provides for ways to get package indexes and some + general lookup functions to start the iterators. + + ##################################################################### */ + /*}}}*/ +// Include Files /*{{{*/ +#include<config.h> + +#include <apt-pkg/pkgcache.h> +#include <apt-pkg/policy.h> +#include <apt-pkg/version.h> +#include <apt-pkg/error.h> +#include <apt-pkg/strutl.h> +#include <apt-pkg/configuration.h> +#include <apt-pkg/aptconfiguration.h> +#include <apt-pkg/mmap.h> +#include <apt-pkg/macros.h> + +#include <stddef.h> +#include <string.h> +#include <sstream> +#include <algorithm> +#include <vector> +#include <string> +#include <sys/stat.h> +#include <zlib.h> + +#include <apti18n.h> + /*}}}*/ + +using std::string; +using APT::StringView; + + +// Cache::Header::Header - Constructor /*{{{*/ +// --------------------------------------------------------------------- +/* Simply initialize the header */ +pkgCache::Header::Header() +{ +#define APT_HEADER_SET(X,Y) X = Y; static_assert(std::numeric_limits<decltype(X)>::max() > Y, "Size violation detected in pkgCache::Header") + APT_HEADER_SET(Signature, 0x98FE76DC); + + /* Whenever the structures change the major version should be bumped, + whenever the generator changes the minor version should be bumped. */ + APT_HEADER_SET(MajorVersion, 10); + APT_HEADER_SET(MinorVersion, 7); + APT_HEADER_SET(Dirty, false); + + APT_HEADER_SET(HeaderSz, sizeof(pkgCache::Header)); + APT_HEADER_SET(GroupSz, sizeof(pkgCache::Group)); + APT_HEADER_SET(PackageSz, sizeof(pkgCache::Package)); + APT_HEADER_SET(ReleaseFileSz, sizeof(pkgCache::ReleaseFile)); + APT_HEADER_SET(PackageFileSz, sizeof(pkgCache::PackageFile)); + APT_HEADER_SET(VersionSz, sizeof(pkgCache::Version)); + APT_HEADER_SET(DescriptionSz, sizeof(pkgCache::Description)); + APT_HEADER_SET(DependencySz, sizeof(pkgCache::Dependency)); + APT_HEADER_SET(DependencyDataSz, sizeof(pkgCache::DependencyData)); + APT_HEADER_SET(ProvidesSz, sizeof(pkgCache::Provides)); + APT_HEADER_SET(VerFileSz, sizeof(pkgCache::VerFile)); + APT_HEADER_SET(DescFileSz, sizeof(pkgCache::DescFile)); +#undef APT_HEADER_SET + + GroupCount = 0; + PackageCount = 0; + VersionCount = 0; + DescriptionCount = 0; + DependsCount = 0; + DependsDataCount = 0; + ReleaseFileCount = 0; + PackageFileCount = 0; + VerFileCount = 0; + DescFileCount = 0; + ProvidesCount = 0; + MaxVerFileSize = 0; + MaxDescFileSize = 0; + + FileList = 0; + RlsFileList = 0; + VerSysName = 0; + Architecture = 0; + SetArchitectures(0); + SetHashTableSize(_config->FindI("APT::Cache-HashTableSize", 50503)); + memset(Pools,0,sizeof(Pools)); + + CacheFileSize = 0; +} + /*}}}*/ +// Cache::Header::CheckSizes - Check if the two headers have same *sz /*{{{*/ +// --------------------------------------------------------------------- +/* */ +bool pkgCache::Header::CheckSizes(Header &Against) const +{ + if (HeaderSz == Against.HeaderSz && + GroupSz == Against.GroupSz && + PackageSz == Against.PackageSz && + ReleaseFileSz == Against.ReleaseFileSz && + PackageFileSz == Against.PackageFileSz && + VersionSz == Against.VersionSz && + DescriptionSz == Against.DescriptionSz && + DependencySz == Against.DependencySz && + DependencyDataSz == Against.DependencyDataSz && + VerFileSz == Against.VerFileSz && + DescFileSz == Against.DescFileSz && + ProvidesSz == Against.ProvidesSz) + return true; + return false; +} + /*}}}*/ + +// Cache::pkgCache - Constructor /*{{{*/ +// --------------------------------------------------------------------- +/* */ +APT_IGNORE_DEPRECATED_PUSH +pkgCache::pkgCache(MMap *Map, bool DoMap) : Map(*Map), VS(nullptr), d(NULL) +{ + // call getArchitectures() with cached=false to ensure that the + // architectures cache is re-evaulated. this is needed in cases + // when the APT::Architecture field changes between two cache creations + MultiArchEnabled = APT::Configuration::getArchitectures(false).size() > 1; + if (DoMap == true) + ReMap(); +} +APT_IGNORE_DEPRECATED_POP + /*}}}*/ +// Cache::ReMap - Reopen the cache file /*{{{*/ +// --------------------------------------------------------------------- +/* If the file is already closed then this will open it open it. */ +bool pkgCache::ReMap(bool const &Errorchecks) +{ + // Apply the typecasts. + HeaderP = (Header *)Map.Data(); + GrpP = (Group *)Map.Data(); + PkgP = (Package *)Map.Data(); + VerFileP = (VerFile *)Map.Data(); + DescFileP = (DescFile *)Map.Data(); + RlsFileP = (ReleaseFile *)Map.Data(); + PkgFileP = (PackageFile *)Map.Data(); + VerP = (Version *)Map.Data(); + DescP = (Description *)Map.Data(); + ProvideP = (Provides *)Map.Data(); + DepP = (Dependency *)Map.Data(); + DepDataP = (DependencyData *)Map.Data(); + StrP = (char *)Map.Data(); + + if (Errorchecks == false) + return true; + + if (Map.Size() == 0 || HeaderP == 0) + return _error->Error(_("Empty package cache")); + + // Check the header + Header DefHeader; + if (HeaderP->Signature != DefHeader.Signature || + HeaderP->Dirty == true) + return _error->Error(_("The package cache file is corrupted")); + + if (HeaderP->MajorVersion != DefHeader.MajorVersion || + HeaderP->MinorVersion != DefHeader.MinorVersion || + HeaderP->CheckSizes(DefHeader) == false) + return _error->Error(_("The package cache file is an incompatible version")); + + if (HeaderP->VerSysName == 0 || HeaderP->Architecture == 0 || HeaderP->GetArchitectures() == 0) + return _error->Error(_("The package cache file is corrupted")); + + // Locate our VS.. + if ((VS = pkgVersioningSystem::GetVS(StrP + HeaderP->VerSysName)) == 0) + return _error->Error(_("This APT does not support the versioning system '%s'"),StrP + HeaderP->VerSysName); + + // Check the architecture + std::vector<std::string> archs = APT::Configuration::getArchitectures(); + std::string list = ""; + for (auto const & arch : archs) { + if (!list.empty()) + list.append(","); + list.append(arch); + } + if (_config->Find("APT::Architecture") != StrP + HeaderP->Architecture || + list != StrP + HeaderP->GetArchitectures()) + return _error->Error(_("The package cache was built for different architectures: %s vs %s"), StrP + HeaderP->GetArchitectures(), list.c_str()); + + + auto hash = CacheHash(); + if (_config->FindB("Debug::pkgCacheGen", false)) + std::clog << "Opened cache with hash " << hash << ", expecting " << HeaderP->CacheFileSize << "\n"; + if (hash != HeaderP->CacheFileSize) + return _error->Error(_("The package cache file is corrupted, it has the wrong hash")); + + return true; +} + /*}}}*/ +// Cache::Hash - Hash a string /*{{{*/ +// --------------------------------------------------------------------- +/* This is used to generate the hash entries for the HashTable. With my + package list from bo this function gets 94% table usage on a 512 item + table (480 used items) */ +map_id_t pkgCache::sHash(StringView Str) const +{ + uint32_t Hash = 5381; + for (auto I = Str.begin(); I != Str.end(); ++I) + Hash = 33 * Hash + tolower_ascii(*I); + return Hash % HeaderP->GetHashTableSize(); +} +map_id_t pkgCache::sHash(const string &Str) const +{ + uint32_t Hash = 5381; + for (string::const_iterator I = Str.begin(); I != Str.end(); ++I) + Hash = 33 * Hash + tolower_ascii((signed char)*I); + return Hash % HeaderP->GetHashTableSize(); +} + +map_id_t pkgCache::sHash(const char *Str) const +{ + uint32_t Hash = 5381; + for (const char *I = Str; *I != 0; ++I) + Hash = 33 * Hash + tolower_ascii((signed char)*I); + return Hash % HeaderP->GetHashTableSize(); +} + +uint32_t pkgCache::CacheHash() +{ + pkgCache::Header header = {}; + uLong adler = adler32(0L, Z_NULL, 0); + + if (Map.Size() < sizeof(header)) + return adler; + memcpy(&header, GetMap().Data(), sizeof(header)); + + header.Dirty = false; + header.CacheFileSize = 0; + + adler = adler32(adler, + reinterpret_cast<const unsigned char *>(&header), + sizeof(header)); + + if (Map.Size() > sizeof(header)) { + adler = adler32(adler, + static_cast<const unsigned char *>(GetMap().Data()) + sizeof(header), + GetMap().Size() - sizeof(header)); + } + + return adler; +} + /*}}}*/ +// Cache::FindPkg - Locate a package by name /*{{{*/ +// --------------------------------------------------------------------- +/* Returns 0 on error, pointer to the package otherwise */ +pkgCache::PkgIterator pkgCache::FindPkg(const string &Name) { + return FindPkg(StringView(Name)); +} + +pkgCache::PkgIterator pkgCache::FindPkg(StringView Name) { + auto const found = Name.rfind(':'); + if (found == string::npos) + return FindPkg(Name, "native"); + auto const Arch = Name.substr(found+1); + /* Beware: This is specialcased to handle pkg:any in dependencies + as these are linked to virtual pkg:any named packages. + If you want any arch from a pkg, use FindPkg(pkg,"any") */ + if (Arch == "any") + return FindPkg(Name, "any"); + return FindPkg(Name.substr(0, found), Arch); +} + /*}}}*/ +// Cache::FindPkg - Locate a package by name /*{{{*/ +// --------------------------------------------------------------------- +/* Returns 0 on error, pointer to the package otherwise */ +pkgCache::PkgIterator pkgCache::FindPkg(const string &Name, string const &Arch) { + return FindPkg(StringView(Name), StringView(Arch)); +} + +pkgCache::PkgIterator pkgCache::FindPkg(StringView Name, StringView Arch) { + /* We make a detour via the GrpIterator here as + on a multi-arch environment a group is easier to + find than a package (less entries in the buckets) */ + pkgCache::GrpIterator Grp = FindGrp(Name); + if (Grp.end() == true) + return PkgIterator(*this,0); + + return Grp.FindPkg(Arch); +} + /*}}}*/ +// Cache::FindGrp - Locate a group by name /*{{{*/ +// --------------------------------------------------------------------- +/* Returns End-Pointer on error, pointer to the group otherwise */ +pkgCache::GrpIterator pkgCache::FindGrp(const string &Name) { + return FindGrp(StringView(Name)); +} + +pkgCache::GrpIterator pkgCache::FindGrp(StringView Name) { + if (unlikely(Name.empty() == true)) + return GrpIterator(*this,0); + + // Look at the hash bucket for the group + Group *Grp = GrpP + HeaderP->GrpHashTableP()[sHash(Name)]; + for (; Grp != GrpP; Grp = GrpP + Grp->Next) { + int const cmp = Name.compare(ViewString(Grp->Name)); + if (cmp == 0) + return GrpIterator(*this, Grp); + else if (cmp < 0) + break; + } + + return GrpIterator(*this,0); +} + /*}}}*/ +// Cache::CompTypeDeb - Return a string describing the compare type /*{{{*/ +// --------------------------------------------------------------------- +/* This returns a string representation of the dependency compare + type in the weird debian style.. */ +const char *pkgCache::CompTypeDeb(unsigned char Comp) +{ + const char * const Ops[] = {"","<=",">=","<<",">>","=","!="}; + if (unlikely((unsigned)(Comp & 0xF) >= sizeof(Ops)/sizeof(Ops[0]))) + return ""; + return Ops[Comp & 0xF]; +} + /*}}}*/ +// Cache::CompType - Return a string describing the compare type /*{{{*/ +// --------------------------------------------------------------------- +/* This returns a string representation of the dependency compare + type */ +const char *pkgCache::CompType(unsigned char Comp) +{ + const char * const Ops[] = {"","<=",">=","<",">","=","!="}; + if (unlikely((unsigned)(Comp & 0xF) >= sizeof(Ops)/sizeof(Ops[0]))) + return ""; + return Ops[Comp & 0xF]; +} + /*}}}*/ +// Cache::DepType - Return a string describing the dep type /*{{{*/ +// --------------------------------------------------------------------- +/* */ +const char *pkgCache::DepType(unsigned char Type) +{ + const char *Types[] = {"",_("Depends"),_("PreDepends"),_("Suggests"), + _("Recommends"),_("Conflicts"),_("Replaces"), + _("Obsoletes"),_("Breaks"), _("Enhances")}; + if (Type < sizeof(Types)/sizeof(*Types)) + return Types[Type]; + return ""; +} + /*}}}*/ +// Cache::Priority - Convert a priority value to a string /*{{{*/ +// --------------------------------------------------------------------- +/* */ +const char *pkgCache::Priority(unsigned char Prio) +{ + const char *Mapping[] = {0,_("required"),_("important"),_("standard"), + _("optional"),_("extra")}; + if (Prio < _count(Mapping)) + return Mapping[Prio]; + return 0; +} + /*}}}*/ +// GrpIterator::FindPkg - Locate a package by arch /*{{{*/ +// --------------------------------------------------------------------- +/* Returns an End-Pointer on error, pointer to the package otherwise */ +pkgCache::PkgIterator pkgCache::GrpIterator::FindPkg(string Arch) const { + return FindPkg(StringView(Arch)); +} +pkgCache::PkgIterator pkgCache::GrpIterator::FindPkg(const char *Arch) const { + return FindPkg(StringView(Arch)); +} +pkgCache::PkgIterator pkgCache::GrpIterator::FindPkg(StringView Arch) const { + if (unlikely(IsGood() == false || S->FirstPackage == 0)) + return PkgIterator(*Owner, 0); + + /* If we accept any package we simply return the "first" + package in this group */ + if (Arch == "any") + return PkgIterator(*Owner, Owner->PkgP + S->FirstPackage); + if (Arch == "native" || Arch == "all") + Arch = Owner->NativeArch(); + + // Iterate over the list to find the matching arch + for (pkgCache::Package *Pkg = PackageList(); Pkg != Owner->PkgP; + Pkg = Owner->PkgP + Pkg->NextPackage) { + if (Arch == Owner->ViewString(Pkg->Arch)) + return PkgIterator(*Owner, Pkg); + if ((Owner->PkgP + S->LastPackage) == Pkg) + break; + } + + return PkgIterator(*Owner, 0); +} + /*}}}*/ +// GrpIterator::FindPreferredPkg - Locate the "best" package /*{{{*/ +// --------------------------------------------------------------------- +/* Returns an End-Pointer on error, pointer to the package otherwise */ +pkgCache::PkgIterator pkgCache::GrpIterator::FindPreferredPkg(bool const &PreferNonVirtual) const { + pkgCache::PkgIterator Pkg = FindPkg(StringView("native", 6)); + if (Pkg.end() == false && (PreferNonVirtual == false || Pkg->VersionList != 0)) + return Pkg; + + std::vector<std::string> const archs = APT::Configuration::getArchitectures(); + for (std::vector<std::string>::const_iterator a = archs.begin(); + a != archs.end(); ++a) { + Pkg = FindPkg(*a); + if (Pkg.end() == false && (PreferNonVirtual == false || Pkg->VersionList != 0)) + return Pkg; + } + // packages without an architecture + Pkg = FindPkg(StringView("none", 4)); + if (Pkg.end() == false && (PreferNonVirtual == false || Pkg->VersionList != 0)) + return Pkg; + + if (PreferNonVirtual == true) + return FindPreferredPkg(false); + return PkgIterator(*Owner, 0); +} + /*}}}*/ +// GrpIterator::NextPkg - Locate the next package in the group /*{{{*/ +// --------------------------------------------------------------------- +/* Returns an End-Pointer on error, pointer to the package otherwise. + We can't simply ++ to the next as the next package of the last will + be from a different group (with the same hash value) */ +pkgCache::PkgIterator pkgCache::GrpIterator::NextPkg(pkgCache::PkgIterator const &LastPkg) const { + if (unlikely(IsGood() == false || S->FirstPackage == 0 || + LastPkg.end() == true)) + return PkgIterator(*Owner, 0); + + if (S->LastPackage == LastPkg.Index()) + return PkgIterator(*Owner, 0); + + return PkgIterator(*Owner, Owner->PkgP + LastPkg->NextPackage); +} + /*}}}*/ +// GrpIterator::operator++ - Prefix incr /*{{{*/ +// --------------------------------------------------------------------- +/* This will advance to the next logical group in the hash table. */ +pkgCache::GrpIterator& pkgCache::GrpIterator::operator++() +{ + // Follow the current links + if (S != Owner->GrpP) + S = Owner->GrpP + S->Next; + + // Follow the hash table + while (S == Owner->GrpP && (HashIndex+1) < (signed)Owner->HeaderP->GetHashTableSize()) + { + ++HashIndex; + S = Owner->GrpP + Owner->HeaderP->GrpHashTableP()[HashIndex]; + } + return *this; +} + /*}}}*/ +// PkgIterator::operator++ - Prefix incr /*{{{*/ +// --------------------------------------------------------------------- +/* This will advance to the next logical package in the hash table. */ +pkgCache::PkgIterator& pkgCache::PkgIterator::operator++() +{ + // Follow the current links + if (S != Owner->PkgP) + S = Owner->PkgP + S->NextPackage; + + // Follow the hash table + while (S == Owner->PkgP && (HashIndex+1) < (signed)Owner->HeaderP->GetHashTableSize()) + { + ++HashIndex; + S = Owner->PkgP + Owner->HeaderP->PkgHashTableP()[HashIndex]; + } + return *this; +} + /*}}}*/ +pkgCache::DepIterator& pkgCache::DepIterator::operator++() /*{{{*/ +{ + if (S == Owner->DepP) + return *this; + S = Owner->DepP + (Type == DepVer ? S->NextDepends : S->NextRevDepends); + if (S == Owner->DepP) + S2 = Owner->DepDataP; + else + S2 = Owner->DepDataP + S->DependencyData; + return *this; +} + /*}}}*/ +// PkgIterator::State - Check the State of the package /*{{{*/ +// --------------------------------------------------------------------- +/* By this we mean if it is either cleanly installed or cleanly removed. */ +pkgCache::PkgIterator::OkState pkgCache::PkgIterator::State() const +{ + if (S->InstState == pkgCache::State::ReInstReq || + S->InstState == pkgCache::State::HoldReInstReq) + return NeedsUnpack; + + if (S->CurrentState == pkgCache::State::UnPacked || + S->CurrentState == pkgCache::State::HalfConfigured) + // we leave triggers alone completely. dpkg deals with + // them in a hard-to-predict manner and if they get + // resolved by dpkg before apt run dpkg --configure on + // the TriggersPending package dpkg returns a error + //Pkg->CurrentState == pkgCache::State::TriggersAwaited + //Pkg->CurrentState == pkgCache::State::TriggersPending) + return NeedsConfigure; + + if (S->CurrentState == pkgCache::State::HalfInstalled || + S->InstState != pkgCache::State::Ok) + return NeedsUnpack; + + return NeedsNothing; +} + /*}}}*/ +// PkgIterator::CandVersion - Returns the candidate version string /*{{{*/ +// --------------------------------------------------------------------- +/* Return string representing of the candidate version. */ +const char * +pkgCache::PkgIterator::CandVersion() const +{ + //TargetVer is empty, so don't use it. + VerIterator version = pkgPolicy(Owner).GetCandidateVer(*this); + if (version.IsGood()) + return version.VerStr(); + return 0; +} + /*}}}*/ +// PkgIterator::CurVersion - Returns the current version string /*{{{*/ +// --------------------------------------------------------------------- +/* Return string representing of the current version. */ +const char * +pkgCache::PkgIterator::CurVersion() const +{ + VerIterator version = CurrentVer(); + if (version.IsGood()) + return CurrentVer().VerStr(); + return 0; +} + /*}}}*/ +// ostream operator to handle string representation of a package /*{{{*/ +// --------------------------------------------------------------------- +/* Output name < cur.rent.version -> candid.ate.version | new.est.version > (section) + Note that the characters <|>() are all literal above. Versions will be omitted + if they provide no new information (e.g. there is no newer version than candidate) + If no version and/or section can be found "none" is used. */ +std::ostream& +operator<<(std::ostream& out, pkgCache::PkgIterator Pkg) +{ + if (Pkg.end() == true) + return out << "invalid package"; + + string current = string(Pkg.CurVersion() == 0 ? "none" : Pkg.CurVersion()); +APT_IGNORE_DEPRECATED_PUSH + string candidate = string(Pkg.CandVersion() == 0 ? "none" : Pkg.CandVersion()); +APT_IGNORE_DEPRECATED_POP + string newest = string(Pkg.VersionList().end() ? "none" : Pkg.VersionList().VerStr()); + + out << Pkg.Name() << " [ " << Pkg.Arch() << " ] < " << current; + if (current != candidate) + out << " -> " << candidate; + if ( newest != "none" && candidate != newest) + out << " | " << newest; + if (Pkg->VersionList == 0) + out << " > ( none )"; + else + out << " > ( " << string(Pkg.VersionList().Section()==0?"unknown":Pkg.VersionList().Section()) << " )"; + return out; +} + /*}}}*/ +// PkgIterator::FullName - Returns Name and (maybe) Architecture /*{{{*/ +// --------------------------------------------------------------------- +/* Returns a name:arch string */ +std::string pkgCache::PkgIterator::FullName(bool const &Pretty) const +{ + string fullname = Name(); + if (Pretty == false || + (strcmp(Arch(), "all") != 0 && strcmp(Arch(), "any") != 0 && + strcmp(Owner->NativeArch(), Arch()) != 0)) + return fullname.append(":").append(Arch()); + return fullname; +} + /*}}}*/ +// DepIterator::IsCritical - Returns true if the dep is important /*{{{*/ +// --------------------------------------------------------------------- +/* Currently critical deps are defined as depends, predepends and + conflicts (including dpkg's Breaks fields). */ +bool pkgCache::DepIterator::IsCritical() const +{ + if (IsNegative() == true || + S2->Type == pkgCache::Dep::Depends || + S2->Type == pkgCache::Dep::PreDepends) + return true; + return false; +} + /*}}}*/ +// DepIterator::IsNegative - Returns true if the dep is a negative one /*{{{*/ +// --------------------------------------------------------------------- +/* Some dependencies are positive like Depends and Recommends, others + are negative like Conflicts which can and should be handled differently */ +bool pkgCache::DepIterator::IsNegative() const +{ + return S2->Type == Dep::DpkgBreaks || + S2->Type == Dep::Conflicts || + S2->Type == Dep::Obsoletes; +} + /*}}}*/ +// DepIterator::SmartTargetPkg - Resolve dep target pointers w/provides /*{{{*/ +// --------------------------------------------------------------------- +/* This intellegently looks at dep target packages and tries to figure + out which package should be used. This is needed to nicely handle + provide mapping. If the target package has no other providing packages + then it returned. Otherwise the providing list is looked at to + see if there is one one unique providing package if so it is returned. + Otherwise true is returned and the target package is set. The return + result indicates whether the node should be expandable + + In Conjunction with the DepCache the value of Result may not be + super-good since the policy may have made it uninstallable. Using + AllTargets is better in this case. */ +bool pkgCache::DepIterator::SmartTargetPkg(PkgIterator &Result) const +{ + Result = TargetPkg(); + + // No provides at all + if (Result->ProvidesList == 0) + return false; + + // There is the Base package and the providing ones which is at least 2 + if (Result->VersionList != 0) + return true; + + /* We have to skip over indirect provisions of the package that + owns the dependency. For instance, if libc5-dev depends on the + virtual package libc-dev which is provided by libc5-dev and libc6-dev + we must ignore libc5-dev when considering the provides list. */ + PrvIterator PStart = Result.ProvidesList(); + for (; PStart.end() != true && PStart.OwnerPkg() == ParentPkg(); ++PStart); + + // Nothing but indirect self provides + if (PStart.end() == true) + return false; + + // Check for single packages in the provides list + PrvIterator P = PStart; + for (; P.end() != true; ++P) + { + // Skip over self provides + if (P.OwnerPkg() == ParentPkg()) + continue; + if (PStart.OwnerPkg() != P.OwnerPkg()) + break; + } + + Result = PStart.OwnerPkg(); + + // Check for non dups + if (P.end() != true) + return true; + + return false; +} + /*}}}*/ +// DepIterator::AllTargets - Returns the set of all possible targets /*{{{*/ +// --------------------------------------------------------------------- +/* This is a more useful version of TargetPkg() that follows versioned + provides. It includes every possible package-version that could satisfy + the dependency. The last item in the list has a 0. The resulting pointer + must be delete [] 'd */ +pkgCache::Version **pkgCache::DepIterator::AllTargets() const +{ + Version **Res = 0; + unsigned long Size =0; + while (1) + { + Version **End = Res; + PkgIterator DPkg = TargetPkg(); + + // Walk along the actual package providing versions + for (VerIterator I = DPkg.VersionList(); I.end() == false; ++I) + { + if (IsIgnorable(I.ParentPkg()) == true) + continue; + if (IsSatisfied(I) == false) + continue; + + Size++; + if (Res != 0) + *End++ = I; + } + + // Follow all provides + for (PrvIterator I = DPkg.ProvidesList(); I.end() == false; ++I) + { + if (IsIgnorable(I) == true) + continue; + if (IsSatisfied(I) == false) + continue; + + Size++; + if (Res != 0) + *End++ = I.OwnerVer(); + } + + // Do it again and write it into the array + if (Res == 0) + { + Res = new Version *[Size+1]; + Size = 0; + } + else + { + *End = 0; + break; + } + } + + return Res; +} + /*}}}*/ +// DepIterator::GlobOr - Compute an OR group /*{{{*/ +// --------------------------------------------------------------------- +/* This Takes an iterator, iterates past the current dependency grouping + and returns Start and End so that so End is the final element + in the group, if End == Start then D is End++ and End is the + dependency D was pointing to. Use in loops to iterate sensibly. */ +void pkgCache::DepIterator::GlobOr(DepIterator &Start,DepIterator &End) +{ + // Compute a single dependency element (glob or) + Start = *this; + End = *this; + for (bool LastOR = true; end() == false && LastOR == true;) + { + LastOR = (S2->CompareOp & pkgCache::Dep::Or) == pkgCache::Dep::Or; + ++(*this); + if (LastOR == true) + End = (*this); + } +} + /*}}}*/ +// DepIterator::IsIgnorable - should this packag/providr be ignored? /*{{{*/ +// --------------------------------------------------------------------- +/* Deps like self-conflicts should be ignored as well as implicit conflicts + on virtual packages. */ +bool pkgCache::DepIterator::IsIgnorable(PkgIterator const &PT) const +{ + if (IsNegative() == false) + return false; + + pkgCache::PkgIterator const PP = ParentPkg(); + if (PP->Group != PT->Group) + return false; + // self-conflict + if (PP == PT) + return true; + pkgCache::VerIterator const PV = ParentVer(); + // ignore group-conflict on a M-A:same package - but not our implicit dependencies + // so that we can have M-A:same packages conflicting with their own real name + if ((PV->MultiArch & pkgCache::Version::Same) == pkgCache::Version::Same) + return IsMultiArchImplicit() == false; + + return false; +} +bool pkgCache::DepIterator::IsIgnorable(PrvIterator const &Prv) const +{ + if (IsNegative() == false) + return false; + + PkgIterator const Pkg = ParentPkg(); + /* Provides may never be applied against the same package (or group) + if it is a conflicts. See the comment above. */ + if (Prv.OwnerPkg()->Group == Pkg->Group) + return true; + // Implicit group-conflicts should not be applied on providers of other groups + if (IsMultiArchImplicit() && Prv.OwnerPkg()->Group != Pkg->Group) + return true; + + return false; +} + /*}}}*/ +// DepIterator::IsSatisfied - check if a version satisfied the dependency /*{{{*/ +bool pkgCache::DepIterator::IsSatisfied(VerIterator const &Ver) const +{ + return Owner->VS->CheckDep(Ver.VerStr(),S2->CompareOp,TargetVer()); +} +bool pkgCache::DepIterator::IsSatisfied(PrvIterator const &Prv) const +{ + return Owner->VS->CheckDep(Prv.ProvideVersion(),S2->CompareOp,TargetVer()); +} + /*}}}*/ +// DepIterator::IsImplicit - added by the cache generation /*{{{*/ +bool pkgCache::DepIterator::IsImplicit() const +{ + if (IsMultiArchImplicit() == true) + return true; + if (IsNegative() || S2->Type == pkgCache::Dep::Replaces) + { + if ((S2->CompareOp & pkgCache::Dep::ArchSpecific) != pkgCache::Dep::ArchSpecific && + strcmp(ParentPkg().Arch(), TargetPkg().Arch()) != 0) + return true; + } + return false; +} + /*}}}*/ +// ostream operator to handle string representation of a dependency /*{{{*/ +// --------------------------------------------------------------------- +/* */ +std::ostream& operator<<(std::ostream& out, pkgCache::DepIterator D) +{ + if (D.end() == true) + return out << "invalid dependency"; + + pkgCache::PkgIterator P = D.ParentPkg(); + pkgCache::PkgIterator T = D.TargetPkg(); + + out << (P.end() ? "invalid pkg" : P.FullName(false)) << " " << D.DepType() + << " on "; +APT_IGNORE_DEPRECATED_PUSH + if (T.end() == true) + out << "invalid pkg"; + else + out << T; +APT_IGNORE_DEPRECATED_POP + + if (D->Version != 0) + out << " (" << D.CompType() << " " << D.TargetVer() << ")"; + + return out; +} + /*}}}*/ +// VerIterator::CompareVer - Fast version compare for same pkgs /*{{{*/ +// --------------------------------------------------------------------- +/* This just looks over the version list to see if B is listed before A. In + most cases this will return in under 4 checks, ver lists are short. */ +int pkgCache::VerIterator::CompareVer(const VerIterator &B) const +{ + // Check if they are equal + if (*this == B) + return 0; + if (end() == true) + return -1; + if (B.end() == true) + return 1; + + /* Start at A and look for B. If B is found then A > B otherwise + B was before A so A < B */ + VerIterator I = *this; + for (;I.end() == false; ++I) + if (I == B) + return 1; + return -1; +} + /*}}}*/ +// VerIterator::Downloadable - Checks if the version is downloadable /*{{{*/ +// --------------------------------------------------------------------- +/* */ +APT_PURE bool pkgCache::VerIterator::Downloadable() const +{ + VerFileIterator Files = FileList(); + for (; Files.end() == false; ++Files) + if (Files.File().Flagged(pkgCache::Flag::NotSource) == false) + return true; + return false; +} + /*}}}*/ +// VerIterator::Automatic - Check if this version is 'automatic' /*{{{*/ +// --------------------------------------------------------------------- +/* This checks to see if any of the versions files are not NotAutomatic. + True if this version is selectable for automatic installation. */ +APT_PURE bool pkgCache::VerIterator::Automatic() const +{ + VerFileIterator Files = FileList(); + for (; Files.end() == false; ++Files) + // Do not check ButAutomaticUpgrades here as it is kind of automatic… + if (Files.File().Flagged(pkgCache::Flag::NotAutomatic) == false) + return true; + return false; +} + /*}}}*/ +// VerIterator::NewestFile - Return the newest file version relation /*{{{*/ +// --------------------------------------------------------------------- +/* This looks at the version numbers associated with all of the sources + this version is in and returns the highest.*/ +pkgCache::VerFileIterator pkgCache::VerIterator::NewestFile() const +{ + VerFileIterator Files = FileList(); + VerFileIterator Highest = Files; + for (; Files.end() == false; ++Files) + { + if (Owner->VS->CmpReleaseVer(Files.File().Version(),Highest.File().Version()) > 0) + Highest = Files; + } + + return Highest; +} + /*}}}*/ +// VerIterator::RelStr - Release description string /*{{{*/ +// --------------------------------------------------------------------- +/* This describes the version from a release-centric manner. The output is a + list of Label:Version/Archive */ +static std::string PkgFileIteratorToRelString(pkgCache::PkgFileIterator const &File) +{ + std::string Res; + if (File.Label() != 0) + Res = Res + File.Label() + ':'; + + if (File.Archive() != 0) + { + if (File.Version() == 0) + Res += File.Archive(); + else + Res = Res + File.Version() + '/' + File.Archive(); + } + else + { + // No release file, print the host name that this came from + if (File.Site() == 0 || File.Site()[0] == 0) + Res += "localhost"; + else + Res += File.Site(); + } + return Res; +} +string pkgCache::VerIterator::RelStr() const +{ + std::vector<std::string> RelStrs; + for (pkgCache::VerFileIterator I = this->FileList(); I.end() == false; ++I) + { + // Do not print 'not source' entries' + pkgCache::PkgFileIterator const File = I.File(); + if (File.Flagged(pkgCache::Flag::NotSource)) + continue; + + std::string const RS = PkgFileIteratorToRelString(File); + if (std::find(RelStrs.begin(), RelStrs.end(), RS) != RelStrs.end()) + continue; + + RelStrs.push_back(RS); + } + std::ostringstream os; + if (likely(RelStrs.empty() == false)) + { + std::copy(RelStrs.begin(), RelStrs.end()-1, std::ostream_iterator<std::string>(os, ", ")); + os << *RelStrs.rbegin(); + } + if (S->ParentPkg != 0) + os << " [" << Arch() << "]"; + return os.str(); +} + /*}}}*/ +// VerIterator::MultiArchType - string representing MultiArch flag /*{{{*/ +const char * pkgCache::VerIterator::MultiArchType() const +{ + if ((S->MultiArch & pkgCache::Version::Same) == pkgCache::Version::Same) + return "same"; + else if ((S->MultiArch & pkgCache::Version::Foreign) == pkgCache::Version::Foreign) + return "foreign"; + else if ((S->MultiArch & pkgCache::Version::Allowed) == pkgCache::Version::Allowed) + return "allowed"; + return "none"; +} + /*}}}*/ +// RlsFileIterator::IsOk - Checks if the cache is in sync with the file /*{{{*/ +// --------------------------------------------------------------------- +/* This stats the file and compares its stats with the ones that were + stored during generation. Date checks should probably also be + included here. */ +bool pkgCache::RlsFileIterator::IsOk() +{ + struct stat Buf; + if (stat(FileName(),&Buf) != 0) + return false; + + if (Buf.st_size != (signed)S->Size || Buf.st_mtime != S->mtime) + return false; + + return true; +} + /*}}}*/ +// RlsFileIterator::RelStr - Return the release string /*{{{*/ +string pkgCache::RlsFileIterator::RelStr() +{ + string Res; + if (Version() != 0) + Res = Res + (Res.empty() == true?"v=":",v=") + Version(); + if (Origin() != 0) + Res = Res + (Res.empty() == true?"o=":",o=") + Origin(); + if (Archive() != 0) + Res = Res + (Res.empty() == true?"a=":",a=") + Archive(); + if (Codename() != 0) + Res = Res + (Res.empty() == true?"n=":",n=") + Codename(); + if (Label() != 0) + Res = Res + (Res.empty() == true?"l=":",l=") + Label(); + return Res; +} + /*}}}*/ +// PkgFileIterator::IsOk - Checks if the cache is in sync with the file /*{{{*/ +// --------------------------------------------------------------------- +/* This stats the file and compares its stats with the ones that were + stored during generation. Date checks should probably also be + included here. */ +bool pkgCache::PkgFileIterator::IsOk() +{ + struct stat Buf; + if (stat(FileName(),&Buf) != 0) + return false; + + if (Buf.st_size != (signed)S->Size || Buf.st_mtime != S->mtime) + return false; + + return true; +} + /*}}}*/ +string pkgCache::PkgFileIterator::RelStr() /*{{{*/ +{ + std::string Res; + if (ReleaseFile() == 0) + { + if (Component() != 0) + Res = Res + (Res.empty() == true?"a=":",a=") + Component(); + } + else + { + Res = ReleaseFile().RelStr(); + if (Component() != 0) + Res = Res + (Res.empty() == true?"c=":",c=") + Component(); + } + if (Architecture() != 0) + Res = Res + (Res.empty() == true?"b=":",b=") + Architecture(); + return Res; +} + /*}}}*/ +// VerIterator::TranslatedDescription - Return the a DescIter for locale/*{{{*/ +// --------------------------------------------------------------------- +/* return a DescIter for the current locale or the default if none is + * found + */ +pkgCache::DescIterator pkgCache::VerIterator::TranslatedDescription() const +{ + std::vector<string> const lang = APT::Configuration::getLanguages(); + for (std::vector<string>::const_iterator l = lang.begin(); + l != lang.end(); ++l) + { + pkgCache::DescIterator Desc = DescriptionList(); + for (; Desc.end() == false; ++Desc) + if (*l == Desc.LanguageCode()) + break; + if (Desc.end() == true) + { + if (*l == "en") + { + Desc = DescriptionList(); + for (; Desc.end() == false; ++Desc) + if (strcmp(Desc.LanguageCode(), "") == 0) + break; + if (Desc.end() == true) + continue; + } + else + continue; + } + return Desc; + } + for (pkgCache::DescIterator Desc = DescriptionList(); + Desc.end() == false; ++Desc) + if (strcmp(Desc.LanguageCode(), "") == 0) + return Desc; + return DescriptionList(); +} + + /*}}}*/ + +pkgCache::~pkgCache() {} |