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-rw-r--r--apt-pkg/cachefile.cc385
1 files changed, 385 insertions, 0 deletions
diff --git a/apt-pkg/cachefile.cc b/apt-pkg/cachefile.cc
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+// -*- mode: cpp; mode: fold -*-
+// Description /*{{{*/
+/* ######################################################################
+
+ 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 <limits>
+#include <memory>
+#include <string>
+#include <vector>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include <apti18n.h>
+ /*}}}*/
+
+struct pkgCacheFile::Private
+{
+ bool WithLock = false;
+ bool InhibitActionGroups = false;
+};
+
+// CacheFile::CacheFile - Constructor /*{{{*/
+pkgCacheFile::pkgCacheFile() : d(new Private()), ExternOwner(false), Map(NULL), Cache(NULL),
+ DCache(NULL), SrcList(NULL), Policy(NULL)
+{
+}
+pkgCacheFile::pkgCacheFile(pkgDepCache * const Owner) : d(new Private()), 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 (d->WithLock == true)
+ _system->UnLock(true);
+
+ delete d;
+}
+ /*}}}*/
+// 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(Progress) == false)
+ return false;
+ d->WithLock = true;
+ }
+
+ 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 (d->InhibitActionGroups)
+ DCache->IncreaseActionGroupLevel();
+ 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 /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+static void SetCacheStartBeforeRemovingCache(std::string const &cache)
+{
+ if (cache.empty())
+ return;
+ auto const CacheStart = _config->FindI("APT::Cache-Start", 0);
+ constexpr auto CacheStartDefault = 24 * 1024 * 1024;
+ struct stat Buf;
+ if (stat(cache.c_str(), &Buf) == 0 && (Buf.st_mode & S_IFREG) != 0)
+ {
+ RemoveFile("RemoveCaches", cache);
+ if (CacheStart == 0 && std::numeric_limits<decltype(CacheStart)>::max() >= Buf.st_size && Buf.st_size > CacheStartDefault)
+ _config->Set("APT::Cache-Start", Buf.st_size);
+ }
+}
+void pkgCacheFile::RemoveCaches()
+{
+ std::string const pkgcache = _config->FindFile("Dir::cache::pkgcache");
+ SetCacheStartBeforeRemovingCache(pkgcache);
+ std::string const srcpkgcache = _config->FindFile("Dir::cache::srcpkgcache");
+ SetCacheStartBeforeRemovingCache(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;
+ if (d->WithLock == true)
+ {
+ _system->UnLock(true);
+ d->WithLock = false;
+ }
+
+ Map = NULL;
+ DCache = NULL;
+ Policy = NULL;
+ Cache = NULL;
+ SrcList = NULL;
+}
+ /*}}}*/
+void pkgCacheFile::InhibitActionGroups(bool const yes)
+{
+ d->InhibitActionGroups = yes;
+}
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