// -*- mode: cpp; mode: fold -*- // Description /*{{{*/ // $Id: deblistparser.cc,v 1.29.2.5 2004/01/06 01:43:44 mdz Exp $ /* ###################################################################### Package Cache Generator - Generator for the cache structure. This builds the cache structure from the abstract package list parser. ##################################################################### */ /*}}}*/ // Include Files /*{{{*/ #include <apt-pkg/deblistparser.h> #include <apt-pkg/error.h> #include <apt-pkg/configuration.h> #include <apt-pkg/aptconfiguration.h> #include <apt-pkg/strutl.h> #include <apt-pkg/crc-16.h> #include <apt-pkg/md5.h> #include <apt-pkg/macros.h> #include <ctype.h> /*}}}*/ static debListParser::WordList PrioList[] = {{"important",pkgCache::State::Important}, {"required",pkgCache::State::Required}, {"standard",pkgCache::State::Standard}, {"optional",pkgCache::State::Optional}, {"extra",pkgCache::State::Extra}, {}}; // ListParser::debListParser - Constructor /*{{{*/ // --------------------------------------------------------------------- /* Provide an architecture and only this one and "all" will be accepted in Step(), if no Architecture is given we will accept every arch we would accept in general with checkArchitecture() */ debListParser::debListParser(FileFd *File, string const &Arch) : Tags(File), Arch(Arch) { if (Arch == "native") this->Arch = _config->Find("APT::Architecture"); } /*}}}*/ // ListParser::UniqFindTagWrite - Find the tag and write a unq string /*{{{*/ // --------------------------------------------------------------------- /* */ unsigned long debListParser::UniqFindTagWrite(const char *Tag) { const char *Start; const char *Stop; if (Section.Find(Tag,Start,Stop) == false) return 0; return WriteUniqString(Start,Stop - Start); } /*}}}*/ // ListParser::Package - Return the package name /*{{{*/ // --------------------------------------------------------------------- /* This is to return the name of the package this section describes */ string debListParser::Package() { string const Result = Section.FindS("Package"); if(unlikely(Result.empty() == true)) _error->Error("Encountered a section with no Package: header"); return Result; } /*}}}*/ // ListParser::Architecture - Return the package arch /*{{{*/ // --------------------------------------------------------------------- /* This will return the Architecture of the package this section describes Note that architecture "all" packages will get the architecture of the Packages file parsed here. */ string debListParser::Architecture() { string const Result = Section.FindS("Architecture"); if (Result.empty() == true || Result == "all") { if (Arch.empty() == true) /* FIXME: this is a problem for installed arch all packages as we don't know from which arch this package was installed - and therefore which dependency this package resolves. */ return _config->Find("APT::Architecture"); else return Arch; } return Result; } /*}}}*/ // ListParser::ArchitectureAll /*{{{*/ // --------------------------------------------------------------------- /* */ bool debListParser::ArchitectureAll() { return Section.FindS("Architecture") == "all"; } /*}}}*/ // ListParser::Version - Return the version string /*{{{*/ // --------------------------------------------------------------------- /* This is to return the string describing the version in debian form, epoch:upstream-release. If this returns the blank string then the entry is assumed to only describe package properties */ string debListParser::Version() { return Section.FindS("Version"); } /*}}}*/ // ListParser::NewVersion - Fill in the version structure /*{{{*/ // --------------------------------------------------------------------- /* */ bool debListParser::NewVersion(pkgCache::VerIterator Ver) { // Parse the section Ver->Section = UniqFindTagWrite("Section"); // Parse multi-arch if (Section.FindS("Architecture") == "all") /* Arch all packages can't have a Multi-Arch field, but we need a special treatment for them nonetheless */ Ver->MultiArch = pkgCache::Version::All; else { string const MultiArch = Section.FindS("Multi-Arch"); if (MultiArch.empty() == true) Ver->MultiArch = pkgCache::Version::None; else if (MultiArch == "same") Ver->MultiArch = pkgCache::Version::Same; else if (MultiArch == "foreign") Ver->MultiArch = pkgCache::Version::Foreign; else if (MultiArch == "allowed") Ver->MultiArch = pkgCache::Version::Allowed; else { _error->Warning("Unknown Multi-Arch type »%s« for package »%s«", MultiArch.c_str(), Section.FindS("Package").c_str()); Ver->MultiArch = pkgCache::Version::None; } } // Archive Size Ver->Size = (unsigned)Section.FindI("Size"); // Unpacked Size (in K) Ver->InstalledSize = (unsigned)Section.FindI("Installed-Size"); Ver->InstalledSize *= 1024; // Priority const char *Start; const char *Stop; if (Section.Find("Priority",Start,Stop) == true) { if (GrabWord(string(Start,Stop-Start),PrioList,Ver->Priority) == false) Ver->Priority = pkgCache::State::Extra; } if (Ver->MultiArch == pkgCache::Version::All) { /* We maintain a "pseudo" arch=all package for architecture all versions on which these versions can depend on. This pseudo package is many used for downloading/installing: The other pseudo-packages will degenerate to a NOP in the download/install step - this package will ensure that it is downloaded only one time and installed only one time -- even if the architecture bound versions coming in and out on regular basis. */ bool const static multiArch = APT::Configuration::getArchitectures().size() > 1; if (strcmp(Ver.Arch(true),"all") == 0) return true; else if (multiArch == true) { // our pseudo packages have no size to not confuse the fetcher Ver->Size = 0; Ver->InstalledSize = 0; } } if (ParseDepends(Ver,"Depends",pkgCache::Dep::Depends) == false) return false; if (ParseDepends(Ver,"Pre-Depends",pkgCache::Dep::PreDepends) == false) return false; if (ParseDepends(Ver,"Suggests",pkgCache::Dep::Suggests) == false) return false; if (ParseDepends(Ver,"Recommends",pkgCache::Dep::Recommends) == false) return false; if (ParseDepends(Ver,"Conflicts",pkgCache::Dep::Conflicts) == false) return false; if (ParseDepends(Ver,"Breaks",pkgCache::Dep::DpkgBreaks) == false) return false; if (ParseDepends(Ver,"Replaces",pkgCache::Dep::Replaces) == false) return false; if (ParseDepends(Ver,"Enhances",pkgCache::Dep::Enhances) == false) return false; // Obsolete. if (ParseDepends(Ver,"Optional",pkgCache::Dep::Suggests) == false) return false; if (ParseProvides(Ver) == false) return false; return true; } /*}}}*/ // ListParser::Description - Return the description string /*{{{*/ // --------------------------------------------------------------------- /* This is to return the string describing the package in debian form. If this returns the blank string then the entry is assumed to only describe package properties */ string debListParser::Description() { string const lang = DescriptionLanguage(); if (lang.empty()) return Section.FindS("Description"); else return Section.FindS(string("Description-").append(lang).c_str()); } /*}}}*/ // ListParser::DescriptionLanguage - Return the description lang string /*{{{*/ // --------------------------------------------------------------------- /* This is to return the string describing the language of description. If this returns the blank string then the entry is assumed to describe original description. */ string debListParser::DescriptionLanguage() { if (Section.FindS("Description").empty() == false) return ""; std::vector<string> const lang = APT::Configuration::getLanguages(); for (std::vector<string>::const_iterator l = lang.begin(); l != lang.end(); l++) if (Section.FindS(string("Description-").append(*l).c_str()).empty() == false) return *l; return ""; } /*}}}*/ // ListParser::Description - Return the description_md5 MD5SumValue /*{{{*/ // --------------------------------------------------------------------- /* This is to return the md5 string to allow the check if it is the right description. If no Description-md5 is found in the section it will be calculated. */ MD5SumValue debListParser::Description_md5() { string value = Section.FindS("Description-md5"); if (value.empty()) { MD5Summation md5; md5.Add((Description() + "\n").c_str()); return md5.Result(); } else return MD5SumValue(value); } /*}}}*/ // ListParser::UsePackage - Update a package structure /*{{{*/ // --------------------------------------------------------------------- /* This is called to update the package with any new information that might be found in the section */ bool debListParser::UsePackage(pkgCache::PkgIterator Pkg, pkgCache::VerIterator Ver) { if (Pkg->Section == 0) Pkg->Section = UniqFindTagWrite("Section"); // Packages which are not from "our" arch doesn't get the essential flag string const static myArch = _config->Find("APT::Architecture"); if (Pkg->Arch != 0 && myArch == Pkg.Arch()) if (Section.FindFlag("Essential",Pkg->Flags,pkgCache::Flag::Essential) == false) return false; if (Section.FindFlag("Important",Pkg->Flags,pkgCache::Flag::Important) == false) return false; if (strcmp(Pkg.Name(),"apt") == 0) Pkg->Flags |= pkgCache::Flag::Important; if (ParseStatus(Pkg,Ver) == false) return false; return true; } /*}}}*/ // ListParser::VersionHash - Compute a unique hash for this version /*{{{*/ // --------------------------------------------------------------------- /* */ unsigned short debListParser::VersionHash() { const char *Sections[] ={"Installed-Size", "Depends", "Pre-Depends", // "Suggests", // "Recommends", "Conflicts", "Breaks", "Replaces",0}; unsigned long Result = INIT_FCS; char S[1024]; for (const char **I = Sections; *I != 0; I++) { const char *Start; const char *End; if (Section.Find(*I,Start,End) == false || End - Start >= (signed)sizeof(S)) continue; /* Strip out any spaces from the text, this undoes dpkgs reformatting of certain fields. dpkg also has the rather interesting notion of reformatting depends operators < -> <= */ char *I = S; for (; Start != End; Start++) { if (isspace(*Start) == 0) *I++ = tolower_ascii(*Start); if (*Start == '<' && Start[1] != '<' && Start[1] != '=') *I++ = '='; if (*Start == '>' && Start[1] != '>' && Start[1] != '=') *I++ = '='; } Result = AddCRC16(Result,S,I - S); } return Result; } /*}}}*/ // ListParser::ParseStatus - Parse the status field /*{{{*/ // --------------------------------------------------------------------- /* Status lines are of the form, Status: want flag status want = unknown, install, hold, deinstall, purge flag = ok, reinstreq, hold, hold-reinstreq status = not-installed, unpacked, half-configured, half-installed, config-files, post-inst-failed, removal-failed, installed Some of the above are obsolete (I think?) flag = hold-* and status = post-inst-failed, removal-failed at least. */ bool debListParser::ParseStatus(pkgCache::PkgIterator Pkg, pkgCache::VerIterator Ver) { const char *Start; const char *Stop; if (Section.Find("Status",Start,Stop) == false) return true; // Isolate the first word const char *I = Start; for(; I < Stop && *I != ' '; I++); if (I >= Stop || *I != ' ') return _error->Error("Malformed Status line"); // Process the want field WordList WantList[] = {{"unknown",pkgCache::State::Unknown}, {"install",pkgCache::State::Install}, {"hold",pkgCache::State::Hold}, {"deinstall",pkgCache::State::DeInstall}, {"purge",pkgCache::State::Purge}, {}}; if (GrabWord(string(Start,I-Start),WantList,Pkg->SelectedState) == false) return _error->Error("Malformed 1st word in the Status line"); // Isloate the next word I++; Start = I; for(; I < Stop && *I != ' '; I++); if (I >= Stop || *I != ' ') return _error->Error("Malformed status line, no 2nd word"); // Process the flag field WordList FlagList[] = {{"ok",pkgCache::State::Ok}, {"reinstreq",pkgCache::State::ReInstReq}, {"hold",pkgCache::State::HoldInst}, {"hold-reinstreq",pkgCache::State::HoldReInstReq}, {}}; if (GrabWord(string(Start,I-Start),FlagList,Pkg->InstState) == false) return _error->Error("Malformed 2nd word in the Status line"); // Isloate the last word I++; Start = I; for(; I < Stop && *I != ' '; I++); if (I != Stop) return _error->Error("Malformed Status line, no 3rd word"); // Process the flag field WordList StatusList[] = {{"not-installed",pkgCache::State::NotInstalled}, {"unpacked",pkgCache::State::UnPacked}, {"half-configured",pkgCache::State::HalfConfigured}, {"installed",pkgCache::State::Installed}, {"half-installed",pkgCache::State::HalfInstalled}, {"config-files",pkgCache::State::ConfigFiles}, {"triggers-awaited",pkgCache::State::TriggersAwaited}, {"triggers-pending",pkgCache::State::TriggersPending}, {"post-inst-failed",pkgCache::State::HalfConfigured}, {"removal-failed",pkgCache::State::HalfInstalled}, {}}; if (GrabWord(string(Start,I-Start),StatusList,Pkg->CurrentState) == false) return _error->Error("Malformed 3rd word in the Status line"); /* A Status line marks the package as indicating the current version as well. Only if it is actually installed.. Otherwise the interesting dpkg handling of the status file creates bogus entries. */ if (!(Pkg->CurrentState == pkgCache::State::NotInstalled || Pkg->CurrentState == pkgCache::State::ConfigFiles)) { if (Ver.end() == true) _error->Warning("Encountered status field in a non-version description"); else Pkg->CurrentVer = Ver.Index(); } return true; } const char *debListParser::ConvertRelation(const char *I,unsigned int &Op) { // Determine the operator switch (*I) { case '<': I++; if (*I == '=') { I++; Op = pkgCache::Dep::LessEq; break; } if (*I == '<') { I++; Op = pkgCache::Dep::Less; break; } // < is the same as <= and << is really Cs < for some reason Op = pkgCache::Dep::LessEq; break; case '>': I++; if (*I == '=') { I++; Op = pkgCache::Dep::GreaterEq; break; } if (*I == '>') { I++; Op = pkgCache::Dep::Greater; break; } // > is the same as >= and >> is really Cs > for some reason Op = pkgCache::Dep::GreaterEq; break; case '=': Op = pkgCache::Dep::Equals; I++; break; // HACK around bad package definitions default: Op = pkgCache::Dep::Equals; break; } return I; } /*}}}*/ // ListParser::ParseDepends - Parse a dependency element /*{{{*/ // --------------------------------------------------------------------- /* This parses the dependency elements out of a standard string in place, bit by bit. */ const char *debListParser::ParseDepends(const char *Start,const char *Stop, string &Package,string &Ver, unsigned int &Op, bool const &ParseArchFlags, bool const &StripMultiArch) { // Strip off leading space for (;Start != Stop && isspace(*Start) != 0; Start++); // Parse off the package name const char *I = Start; for (;I != Stop && isspace(*I) == 0 && *I != '(' && *I != ')' && *I != ',' && *I != '|'; I++); // Malformed, no '(' if (I != Stop && *I == ')') return 0; if (I == Start) return 0; // Stash the package name Package.assign(Start,I - Start); // We don't want to confuse library users which can't handle MultiArch if (StripMultiArch == true) { size_t const found = Package.rfind(':'); if (found != string::npos) Package = Package.substr(0,found); } // Skip white space to the '(' for (;I != Stop && isspace(*I) != 0 ; I++); // Parse a version if (I != Stop && *I == '(') { // Skip the '(' for (I++; I != Stop && isspace(*I) != 0 ; I++); if (I + 3 >= Stop) return 0; I = ConvertRelation(I,Op); // Skip whitespace for (;I != Stop && isspace(*I) != 0; I++); Start = I; for (;I != Stop && *I != ')'; I++); if (I == Stop || Start == I) return 0; // Skip trailing whitespace const char *End = I; for (; End > Start && isspace(End[-1]); End--); Ver.assign(Start,End-Start); I++; } else { Ver.clear(); Op = pkgCache::Dep::NoOp; } // Skip whitespace for (;I != Stop && isspace(*I) != 0; I++); if (ParseArchFlags == true) { string arch = _config->Find("APT::Architecture"); // Parse an architecture if (I != Stop && *I == '[') { // malformed I++; if (I == Stop) return 0; const char *End = I; bool Found = false; bool NegArch = false; while (I != Stop) { // look for whitespace or ending ']' while (End != Stop && !isspace(*End) && *End != ']') End++; if (End == Stop) return 0; if (*I == '!') { NegArch = true; I++; } if (stringcmp(arch,I,End) == 0) Found = true; if (*End++ == ']') { I = End; break; } I = End; for (;I != Stop && isspace(*I) != 0; I++); } if (NegArch) Found = !Found; if (Found == false) Package = ""; /* not for this arch */ } // Skip whitespace for (;I != Stop && isspace(*I) != 0; I++); } if (I != Stop && *I == '|') Op |= pkgCache::Dep::Or; if (I == Stop || *I == ',' || *I == '|') { if (I != Stop) for (I++; I != Stop && isspace(*I) != 0; I++); return I; } return 0; } /*}}}*/ // ListParser::ParseDepends - Parse a dependency list /*{{{*/ // --------------------------------------------------------------------- /* This is the higher level depends parser. It takes a tag and generates a complete depends tree for the given version. */ bool debListParser::ParseDepends(pkgCache::VerIterator Ver, const char *Tag,unsigned int Type) { const char *Start; const char *Stop; if (Section.Find(Tag,Start,Stop) == false) return true; string Package; string const pkgArch = Ver.Arch(true); string Version; unsigned int Op; while (1) { Start = ParseDepends(Start,Stop,Package,Version,Op); if (Start == 0) return _error->Error("Problem parsing dependency %s",Tag); if (NewDepends(Ver,Package,pkgArch,Version,Op,Type) == false) return false; if (Start == Stop) break; } return true; } /*}}}*/ // ListParser::ParseProvides - Parse the provides list /*{{{*/ // --------------------------------------------------------------------- /* */ bool debListParser::ParseProvides(pkgCache::VerIterator Ver) { const char *Start; const char *Stop; if (Section.Find("Provides",Start,Stop) == true) { string Package; string Version; string const Arch = Ver.Arch(true); unsigned int Op; while (1) { Start = ParseDepends(Start,Stop,Package,Version,Op); if (Start == 0) return _error->Error("Problem parsing Provides line"); if (Op != pkgCache::Dep::NoOp) { _error->Warning("Ignoring Provides line with DepCompareOp for package %s", Package.c_str()); } else { if (NewProvides(Ver, Package, Arch, Version) == false) return false; } if (Start == Stop) break; } } if (Ver->MultiArch == pkgCache::Version::Allowed) { string const Package = string(Ver.ParentPkg().Name()).append(":").append("any"); NewProvides(Ver, Package, "any", Ver.VerStr()); } if (Ver->MultiArch != pkgCache::Version::Foreign) return true; std::vector<string> const archs = APT::Configuration::getArchitectures(); if (archs.size() <= 1) return true; string const Package = Ver.ParentPkg().Name(); string const Version = Ver.VerStr(); for (std::vector<string>::const_iterator a = archs.begin(); a != archs.end(); ++a) { if (NewProvides(Ver, Package, *a, Version) == false) return false; } return true; } /*}}}*/ // ListParser::GrabWord - Matches a word and returns /*{{{*/ // --------------------------------------------------------------------- /* Looks for a word in a list of words - for ParseStatus */ bool debListParser::GrabWord(string Word,WordList *List,unsigned char &Out) { for (unsigned int C = 0; List[C].Str != 0; C++) { if (strcasecmp(Word.c_str(),List[C].Str) == 0) { Out = List[C].Val; return true; } } return false; } /*}}}*/ // ListParser::Step - Move to the next section in the file /*{{{*/ // --------------------------------------------------------------------- /* This has to be carefull to only process the correct architecture */ bool debListParser::Step() { iOffset = Tags.Offset(); while (Tags.Step(Section) == true) { /* See if this is the correct Architecture, if it isn't then we drop the whole section. A missing arch tag only happens (in theory) inside the Status file, so that is a positive return */ string const Architecture = Section.FindS("Architecture"); if (Architecture.empty() == true) return true; if (Arch.empty() == true) { if (APT::Configuration::checkArchitecture(Architecture) == true) return true; } else { if (Architecture == Arch) return true; if (Architecture == "all") return true; } iOffset = Tags.Offset(); } return false; } /*}}}*/ // ListParser::LoadReleaseInfo - Load the release information /*{{{*/ // --------------------------------------------------------------------- /* */ bool debListParser::LoadReleaseInfo(pkgCache::PkgFileIterator FileI, FileFd &File, string component) { pkgTagFile Tags(&File, File.Size() + 256); // XXX pkgTagSection Section; if (Tags.Step(Section) == false) return false; // FIXME: Do we need it now for multi-arch? // mvo: I don't think we need to fill that in (it's unused since apt-0.6) // FileI->Architecture = WriteUniqString(Arch); // apt-secure does no longer download individual (per-section) Release // file. to provide Component pinning we use the section name now FileI->Component = WriteUniqString(component); const char *Start; const char *Stop; if (Section.Find("Suite",Start,Stop) == true) FileI->Archive = WriteUniqString(Start,Stop - Start); if (Section.Find("Component",Start,Stop) == true) FileI->Component = WriteUniqString(Start,Stop - Start); if (Section.Find("Version",Start,Stop) == true) FileI->Version = WriteUniqString(Start,Stop - Start); if (Section.Find("Origin",Start,Stop) == true) FileI->Origin = WriteUniqString(Start,Stop - Start); if (Section.Find("Codename",Start,Stop) == true) FileI->Codename = WriteUniqString(Start,Stop - Start); if (Section.Find("Label",Start,Stop) == true) FileI->Label = WriteUniqString(Start,Stop - Start); if (Section.Find("Architecture",Start,Stop) == true) FileI->Architecture = WriteUniqString(Start,Stop - Start); if (Section.FindFlag("NotAutomatic",FileI->Flags, pkgCache::Flag::NotAutomatic) == false) _error->Warning("Bad NotAutomatic flag"); return !_error->PendingError(); } /*}}}*/ // ListParser::GetPrio - Convert the priority from a string /*{{{*/ // --------------------------------------------------------------------- /* */ unsigned char debListParser::GetPrio(string Str) { unsigned char Out; if (GrabWord(Str,PrioList,Out) == false) Out = pkgCache::State::Extra; return Out; } /*}}}*/