Support for memory-only caching

Author: jgg
Date: 1999-04-18 06:36:36 GMT
Support for memory-only caching

1 files changed, 96 insertions, 0 deletions

diff --git a/apt-pkg/cachefile.cc b/apt-pkg/cachefile.cc
new file mode 100644
index 000000000..285eb310f
--- /dev/null
+++ b/apt-pkg/cachefile.cc
@@ -0,0 +1,96 @@
+// -*- mode: cpp; mode: fold -*-
+// Description								/*{{{*/
+// $Id: cachefile.cc,v 1.1 1999/04/18 06:36:36 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							/*{{{*/
+#ifdef __GNUG__
+#pragma implementation "apt-pkg/cachefile.h"
+#endif
+
+#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>
+									/*}}}*/
+
+// CacheFile::CacheFile - Constructor					/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+pkgCacheFile::pkgCacheFile() : Map(0), Cache(0), Lock() 
+{
+}
+									/*}}}*/
+// CacheFile::~CacheFile - Destructor						/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+pkgCacheFile::~pkgCacheFile()
+{
+   delete Cache;
+   delete Map;
+   delete Lock;
+}   
+									/*}}}*/
+// CacheFile::Open - Open the cache files, creating if necessary	/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool pkgCacheFile::Open(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)
+   {
+      pkgMakeStatusCache(List,Progress);
+      Progress.Done();
+      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;
+   }
+   else
+   {
+      Map = pkgMakeStatusCacheMem(List,Progress);
+      Progress.Done();
+      if (Map == 0)
+	 return false;
+   }
+   
+   // Create the dependency cache
+   Cache = new pkgDepCache(*Map,Progress);
+   if (_error->PendingError() == true)
+      return false;
+
+   Progress.Done();
+   
+   return true;
+}
+									/*}}}*/