apt-pkg/cachefile.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: cachefile.cc,v 1.4 1999/06/24 04:06:30 jgg Exp $
   4 /* ######################################################################
   5
   6    CacheFile - Simple wrapper class for opening, generating and whatnot
   7
   8    This class implements a simple 2 line mechanism to open various sorts
   9    of caches. It can operate as root, as not root, show progress and so on,
  10    it transparently handles everything necessary.
  11
  12    ##################################################################### */
  13                                                                         /*}}}*/
  14 // Include Files                                                        /*{{{*/
  15 #ifdef __GNUG__
  16 #pragma implementation "apt-pkg/cachefile.h"
  17 #endif
  18
  19 #include <apt-pkg/cachefile.h>
  20 #include <apt-pkg/error.h>
  21 #include <apt-pkg/sourcelist.h>
  22 #include <apt-pkg/pkgcachegen.h>
  23 #include <apt-pkg/configuration.h>
  24                                                                         /*}}}*/
  25
  26 // CacheFile::CacheFile - Constructor                                   /*{{{*/
  27 // ---------------------------------------------------------------------
  28 /* */
  29 pkgCacheFile::pkgCacheFile() : Map(0), Cache(0), Lock(0)
  30 {
  31 }
  32                                                                         /*}}}*/
  33 // CacheFile::~CacheFile - Destructor                                           /*{{{*/
  34 // ---------------------------------------------------------------------
  35 /* */
  36 pkgCacheFile::~pkgCacheFile()
  37 {
  38    delete Cache;
  39    delete Map;
  40    delete Lock;
  41 }
  42                                                                         /*}}}*/
  43 // CacheFile::Open - Open the cache files, creating if necessary        /*{{{*/
  44 // ---------------------------------------------------------------------
  45 /* */
  46 bool pkgCacheFile::Open(OpProgress &Progress,bool WithLock)
  47 {
  48    if (WithLock == true)
  49       Lock = new pkgDpkgLock;
  50
  51    if (_error->PendingError() == true)
  52       return false;
  53
  54    // Read the source list
  55    pkgSourceList List;
  56    if (List.ReadMainList() == false)
  57       return _error->Error("The list of sources could not be read.");
  58
  59    /* Build all of the caches, using the cache files if we are locking
  60       (ie as root) */
  61    if (WithLock == true)
  62    {
  63       pkgMakeStatusCache(List,Progress);
  64       Progress.Done();
  65       if (_error->PendingError() == true)
  66          return _error->Error("The package lists or status file could not be parsed or opened.");
  67       if (_error->empty() == false)
  68          _error->Warning("You may want to run apt-get update to correct these missing files");
  69
  70       // Open the cache file
  71       FileFd File(_config->FindFile("Dir::Cache::pkgcache"),FileFd::ReadOnly);
  72       if (_error->PendingError() == true)
  73          return false;
  74
  75       Map = new MMap(File,MMap::Public | MMap::ReadOnly);
  76       if (_error->PendingError() == true)
  77          return false;
  78    }
  79    else
  80    {
  81       Map = pkgMakeStatusCacheMem(List,Progress);
  82       Progress.Done();
  83       if (Map == 0)
  84          return false;
  85    }
  86
  87    // Create the dependency cache
  88    Cache = new pkgDepCache(*Map,Progress);
  89    Progress.Done();
  90    if (_error->PendingError() == true)
  91       return false;
  92
  93    return true;
  94 }
  95                                                                         /*}}}*/