// -*- mode: cpp; mode: fold -*- // Description /*{{{*/ // $Id: cachefile.cc,v 1.8 2002/04/27 04:28:04 jgg Exp $ /* ###################################################################### CacheFile - Simple wrapper class for opening, generating and whatnot This class implements a simple 2 line mechanism to open various sorts of caches. It can operate as root, as not root, show progress and so on, it transparently handles everything necessary. ##################################################################### */ /*}}}*/ // Include Files /*{{{*/ #include <config.h> #include <apt-pkg/cachefile.h> #include <apt-pkg/configuration.h> #include <apt-pkg/depcache.h> #include <apt-pkg/error.h> #include <apt-pkg/fileutl.h> #include <apt-pkg/indexfile.h> #include <apt-pkg/mmap.h> #include <apt-pkg/pkgcache.h> #include <apt-pkg/pkgcachegen.h> #include <apt-pkg/pkgsystem.h> #include <apt-pkg/policy.h> #include <apt-pkg/progress.h> #include <apt-pkg/sourcelist.h> #include <memory> #include <string> #include <vector> #include <string.h> #include <unistd.h> #include <apti18n.h> /*}}}*/ // CacheFile::CacheFile - Constructor /*{{{*/ pkgCacheFile::pkgCacheFile() : d(NULL), ExternOwner(false), Map(NULL), Cache(NULL), DCache(NULL), SrcList(NULL), Policy(NULL) { } pkgCacheFile::pkgCacheFile(pkgDepCache * const Owner) : d(NULL), ExternOwner(true), Map(&Owner->GetCache().GetMap()), Cache(&Owner->GetCache()), DCache(Owner), SrcList(NULL), Policy(NULL) { } /*}}}*/ // CacheFile::~CacheFile - Destructor /*{{{*/ // --------------------------------------------------------------------- /* */ pkgCacheFile::~pkgCacheFile() { if (ExternOwner == false) { delete DCache; delete Cache; delete Map; } delete Policy; delete SrcList; if (ExternOwner == false) _system->UnLock(true); } /*}}}*/ // CacheFile::BuildCaches - Open and build the cache files /*{{{*/ class APT_HIDDEN ScopedErrorMerge { public: ScopedErrorMerge() { _error->PushToStack(); } ~ScopedErrorMerge() { _error->MergeWithStack(); } }; bool pkgCacheFile::BuildCaches(OpProgress *Progress, bool WithLock) { std::unique_ptr<pkgCache> Cache; std::unique_ptr<MMap> Map; if (this->Cache != NULL) return true; ScopedErrorMerge sem; if (_config->FindB("pkgCacheFile::Generate", true) == false) { FileFd file(_config->FindFile("Dir::Cache::pkgcache"), FileFd::ReadOnly); if (file.IsOpen() == false || file.Failed()) return false; Map.reset(new MMap(file, MMap::Public|MMap::ReadOnly)); if (unlikely(Map->validData() == false)) return false; Cache.reset(new pkgCache(Map.get())); if (_error->PendingError() == true) return false; this->Cache = Cache.release(); this->Map = Map.release(); return true; } if (WithLock == true) if (_system->Lock() == false) return false; if (_error->PendingError() == true) return false; if (BuildSourceList(Progress) == false) return false; // Read the caches MMap *TmpMap = nullptr; pkgCache *TmpCache = nullptr; bool Res = pkgCacheGenerator::MakeStatusCache(*SrcList,Progress,&TmpMap, &TmpCache, true); Map.reset(TmpMap); Cache.reset(TmpCache); if (Progress != NULL) Progress->Done(); if (Res == false) return _error->Error(_("The package lists or status file could not be parsed or opened.")); /* This sux, remove it someday */ if (_error->PendingError() == true) _error->Warning(_("You may want to run apt-get update to correct these problems")); if (Cache == nullptr) Cache.reset(new pkgCache(Map.get())); if (_error->PendingError() == true) return false; this->Map = Map.release(); this->Cache = Cache.release(); return true; } /*}}}*/ // CacheFile::BuildSourceList - Open and build all relevant sources.list/*{{{*/ // --------------------------------------------------------------------- /* */ bool pkgCacheFile::BuildSourceList(OpProgress * /*Progress*/) { std::unique_ptr<pkgSourceList> SrcList; if (this->SrcList != NULL) return true; SrcList.reset(new pkgSourceList()); if (SrcList->ReadMainList() == false) return _error->Error(_("The list of sources could not be read.")); this->SrcList = SrcList.release(); return true; } /*}}}*/ // CacheFile::BuildPolicy - Open and build all relevant preferences /*{{{*/ // --------------------------------------------------------------------- /* */ bool pkgCacheFile::BuildPolicy(OpProgress * /*Progress*/) { std::unique_ptr<pkgPolicy> Policy; if (this->Policy != NULL) return true; Policy.reset(new pkgPolicy(Cache)); if (_error->PendingError() == true) return false; ReadPinFile(*Policy); ReadPinDir(*Policy); this->Policy = Policy.release(); return _error->PendingError() == false; } /*}}}*/ // CacheFile::BuildDepCache - Open and build the dependency cache /*{{{*/ // --------------------------------------------------------------------- /* */ bool pkgCacheFile::BuildDepCache(OpProgress *Progress) { if (BuildCaches(Progress, false) == false) return false; std::unique_ptr<pkgDepCache> DCache; if (this->DCache != NULL) return true; if (BuildPolicy(Progress) == false) return false; DCache.reset(new pkgDepCache(Cache,Policy)); if (_error->PendingError() == true) return false; if (DCache->Init(Progress) == false) return false; this->DCache = DCache.release(); return true; } /*}}}*/ // CacheFile::Open - Open the cache files, creating if necessary /*{{{*/ // --------------------------------------------------------------------- /* */ bool pkgCacheFile::Open(OpProgress *Progress, bool WithLock) { if (BuildCaches(Progress,WithLock) == false) return false; if (BuildPolicy(Progress) == false) return false; if (BuildDepCache(Progress) == false) return false; if (Progress != NULL) Progress->Done(); if (_error->PendingError() == true) return false; return true; } /*}}}*/ bool pkgCacheFile::AddIndexFile(pkgIndexFile * const File) /*{{{*/ { if (SrcList == NULL) if (BuildSourceList() == false) return false; SrcList->AddVolatileFile(File); if (Cache == nullptr || File->HasPackages() == false || File->Exists() == false) return true; if (File->FindInCache(*Cache).end() == false) return _error->Warning("Duplicate sources.list entry %s", File->Describe().c_str()); if (ExternOwner == false) { delete DCache; delete Cache; } delete Policy; DCache = NULL; Policy = NULL; Cache = NULL; if (ExternOwner == false) { // a dynamic mmap means that we have build at least parts of the cache // in memory – which we might or might not have written to disk. // Throwing away would therefore be a very costly operation we want to avoid DynamicMMap * dynmmap = dynamic_cast<DynamicMMap*>(Map); if (dynmmap != nullptr) { { pkgCacheGenerator Gen(dynmmap, nullptr); if (Gen.Start() == false || File->Merge(Gen, nullptr) == false) return false; } Cache = new pkgCache(Map); if (_error->PendingError() == true) { delete Cache; Cache = nullptr; return false; } return true; } else { delete Map; Map = NULL; } } else { ExternOwner = false; Map = NULL; } _system->UnLock(true); return true; } /*}}}*/ // CacheFile::RemoveCaches - remove all cache files from disk /*{{{*/ // --------------------------------------------------------------------- /* */ void pkgCacheFile::RemoveCaches() { std::string const pkgcache = _config->FindFile("Dir::cache::pkgcache"); std::string const srcpkgcache = _config->FindFile("Dir::cache::srcpkgcache"); if (pkgcache.empty() == false && RealFileExists(pkgcache) == true) RemoveFile("RemoveCaches", pkgcache); if (srcpkgcache.empty() == false && RealFileExists(srcpkgcache) == true) RemoveFile("RemoveCaches", srcpkgcache); if (pkgcache.empty() == false) { std::string cachedir = flNotFile(pkgcache); std::string cachefile = flNotDir(pkgcache); if (cachedir.empty() != true && cachefile.empty() != true && DirectoryExists(cachedir) == true) { cachefile.append("."); std::vector<std::string> caches = GetListOfFilesInDir(cachedir, false); for (std::vector<std::string>::const_iterator file = caches.begin(); file != caches.end(); ++file) { std::string nuke = flNotDir(*file); if (strncmp(cachefile.c_str(), nuke.c_str(), cachefile.length()) != 0) continue; RemoveFile("RemoveCaches", *file); } } } if (srcpkgcache.empty() == true) return; std::string cachedir = flNotFile(srcpkgcache); std::string cachefile = flNotDir(srcpkgcache); if (cachedir.empty() == true || cachefile.empty() == true || DirectoryExists(cachedir) == false) return; cachefile.append("."); std::vector<std::string> caches = GetListOfFilesInDir(cachedir, false); for (std::vector<std::string>::const_iterator file = caches.begin(); file != caches.end(); ++file) { std::string nuke = flNotDir(*file); if (strncmp(cachefile.c_str(), nuke.c_str(), cachefile.length()) != 0) continue; RemoveFile("RemoveCaches", *file); } } /*}}}*/ // CacheFile::Close - close the cache files /*{{{*/ // --------------------------------------------------------------------- /* */ void pkgCacheFile::Close() { if (ExternOwner == false) { delete DCache; delete Cache; delete Map; } else ExternOwner = false; delete Policy; delete SrcList; _system->UnLock(true); Map = NULL; DCache = NULL; Policy = NULL; Cache = NULL; SrcList = NULL; } /*}}}*/