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update: Check if the cache could be opened, don't just assume it
[apt.git] / apt-pkg / cachefile.cc
diff --git a/apt-pkg/cachefile.cc b/apt-pkg/cachefile.cc
index 285eb310f8f1108feb2b8f16837e74e029287307..ed3c2dd0a538ae36db332850c6c666c3c193f7dd 100644 (file)
--- a/apt-pkg/cachefile.cc
+++ b/apt-pkg/cachefile.cc
@@ -1,6 +1,6 @@
 // -*- mode: cpp; mode: fold -*-
 // Description                                                         /*{{{*/
 // -*- mode: cpp; mode: fold -*-
 // Description                                                         /*{{{*/
-// $Id: cachefile.cc,v 1.1 1999/04/18 06:36:36 jgg Exp $
+// $Id: cachefile.cc,v 1.8 2002/04/27 04:28:04 jgg Exp $
 /* ######################################################################
    
    CacheFile - Simple wrapper class for opening, generating and whatnot
 /* ######################################################################
    
    CacheFile - Simple wrapper class for opening, generating and whatnot
@@ -12,85 +12,246 @@
    ##################################################################### */
                                                                        /*}}}*/
 // Include Files                                                       /*{{{*/
    ##################################################################### */
                                                                        /*}}}*/
 // Include Files                                                       /*{{{*/
-#ifdef __GNUG__
-#pragma implementation "apt-pkg/cachefile.h"
-#endif
+#include <config.h>
 
 #include <apt-pkg/cachefile.h>
 #include <apt-pkg/error.h>
 #include <apt-pkg/sourcelist.h>
 #include <apt-pkg/pkgcachegen.h>
 #include <apt-pkg/configuration.h>
 
 #include <apt-pkg/cachefile.h>
 #include <apt-pkg/error.h>
 #include <apt-pkg/sourcelist.h>
 #include <apt-pkg/pkgcachegen.h>
 #include <apt-pkg/configuration.h>
-                                                                       /*}}}*/
+#include <apt-pkg/policy.h>
+#include <apt-pkg/pkgsystem.h>
+#include <apt-pkg/fileutl.h>
+#include <apt-pkg/progress.h>
+#include <apt-pkg/depcache.h>
+#include <apt-pkg/mmap.h>
+#include <apt-pkg/pkgcache.h>
+
+#include <string.h>
+#include <unistd.h>
+#include <string>
+#include <vector>
 
 
+#include <apti18n.h>
+                                                                       /*}}}*/
 // CacheFile::CacheFile - Constructor                                  /*{{{*/
 // CacheFile::CacheFile - Constructor                                  /*{{{*/
-// ---------------------------------------------------------------------
-/* */
-pkgCacheFile::pkgCacheFile() : Map(0), Cache(0), Lock() 
+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                                          /*{{{*/
+// CacheFile::~CacheFile - Destructor                                  /*{{{*/
 // ---------------------------------------------------------------------
 /* */
 pkgCacheFile::~pkgCacheFile()
 {
 // ---------------------------------------------------------------------
 /* */
 pkgCacheFile::~pkgCacheFile()
 {
-   delete Cache;
-   delete Map;
-   delete Lock;
-}   
+   if (ExternOwner == false)
+   {
+      delete DCache;
+      delete Cache;
+      delete Map;
+   }
+   delete Policy;
+   delete SrcList;
+   if (ExternOwner == false)
+      _system->UnLock(true);
+}
                                                                        /*}}}*/
                                                                        /*}}}*/
-// CacheFile::Open - Open the cache files, creating if necessary       /*{{{*/
+// CacheFile::BuildCaches - Open and build the cache files             /*{{{*/
 // ---------------------------------------------------------------------
 /* */
 // ---------------------------------------------------------------------
 /* */
-bool pkgCacheFile::Open(OpProgress &Progress,bool WithLock)
+bool pkgCacheFile::BuildCaches(OpProgress *Progress, bool WithLock)
 {
 {
-   if (WithLock == true)
-      Lock = new pkgDpkgLock;
-   
-   if (_error->PendingError() == true)
-      return false;
-   
-   // Read the source list
-   pkgSourceList List;
-   if (List.ReadMainList() == false)
-      return _error->Error("The list of sources could not be read.");
-   
-   /* Build all of the caches, using the cache files if we are locking 
-      (ie as root) */
-   if (WithLock == true)
+   if (Cache != NULL)
+      return true;
+
+   if (_config->FindB("pkgCacheFile::Generate", true) == false)
    {
    {
-      pkgMakeStatusCache(List,Progress);
-      Progress.Done();
+      FileFd file(_config->FindFile("Dir::Cache::pkgcache"), FileFd::ReadOnly);
+      Map = new MMap(file, MMap::Public|MMap::ReadOnly);
+      Cache = new pkgCache(Map);
       if (_error->PendingError() == true)
       if (_error->PendingError() == true)
-        return _error->Error("The package lists or status file could not be parsed or opened.");
-      if (_error->empty() == false)
-        _error->Warning("You may want to run apt-get update to correct theses missing files");
-      
-      // Open the cache file
-      FileFd File(_config->FindFile("Dir::Cache::pkgcache"),FileFd::ReadOnly);
-      if (_error->PendingError() == true)
-        return false;
-      
-      Map = new MMap(File,MMap::Public | MMap::ReadOnly);
-      if (_error->PendingError() == true)
-        return false;
+         return false;
+      return true;
    }
    }
-   else
-   {
-      Map = pkgMakeStatusCacheMem(List,Progress);
-      Progress.Done();
-      if (Map == 0)
+
+   const bool ErrorWasEmpty = _error->empty();
+   if (WithLock == true)
+      if (_system->Lock() == false)
         return false;
         return false;
-   }
    
    
-   // Create the dependency cache
-   Cache = new pkgDepCache(*Map,Progress);
+   if (_config->FindB("Debug::NoLocking",false) == true)
+      WithLock = false;
+      
    if (_error->PendingError() == true)
       return false;
 
    if (_error->PendingError() == true)
       return false;
 
-   Progress.Done();
+   BuildSourceList(Progress);
+
+   // Read the caches
+   bool Res = pkgCacheGenerator::MakeStatusCache(*SrcList,Progress,&Map,!WithLock);
+   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 (ErrorWasEmpty == true && _error->empty() == false)
+      _error->Warning(_("You may want to run apt-get update to correct these problems"));
+
+   Cache = new pkgCache(Map);
+   if (_error->PendingError() == true)
+      return false;
+   return true;
+}
+                                                                       /*}}}*/
+// CacheFile::BuildSourceList - Open and build all relevant sources.list/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool pkgCacheFile::BuildSourceList(OpProgress * /*Progress*/)
+{
+   if (SrcList != NULL)
+      return true;
+
+   SrcList = new pkgSourceList();
+   if (SrcList->ReadMainList() == false)
+      return _error->Error(_("The list of sources could not be read."));
+   return true;
+}
+                                                                       /*}}}*/
+// CacheFile::BuildPolicy - Open and build all relevant preferences    /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool pkgCacheFile::BuildPolicy(OpProgress * /*Progress*/)
+{
+   if (Policy != NULL)
+      return true;
+
+   Policy = new pkgPolicy(Cache);
+   if (_error->PendingError() == true)
+      return false;
+
+   if (ReadPinFile(*Policy) == false || ReadPinDir(*Policy) == false)
+      return false;
+
+   return true;
+}
+                                                                       /*}}}*/
+// CacheFile::BuildDepCache - Open and build the dependency cache      /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool pkgCacheFile::BuildDepCache(OpProgress *Progress)
+{
+   if (DCache != NULL)
+      return true;
+
+   if (BuildPolicy(Progress) == false)
+      return false;
+
+   DCache = new pkgDepCache(Cache,Policy);
+   if (_error->PendingError() == true)
+      return false;
+
+   DCache->Init(Progress);
+   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;
 }
                                                                        /*}}}*/
    
    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)
+      unlink(pkgcache.c_str());
+   if (srcpkgcache.empty() == false && RealFileExists(srcpkgcache) == true)
+      unlink(srcpkgcache.c_str());
+   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;
+           unlink(file->c_str());
+        }
+      }
+   }
+
+   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;
+      unlink(file->c_str());
+   }
+}
+                                                                       /*}}}*/
+// 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;
+}
+                                                                       /*}}}*/
APT (for Cydia)