apt-pkg/cachefile.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: cachefile.cc,v 1.8 2002/04/27 04:28:04 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 #include <apt-pkg/cachefile.h>
  16 #include <apt-pkg/error.h>
  17 #include <apt-pkg/sourcelist.h>
  18 #include <apt-pkg/pkgcachegen.h>
  19 #include <apt-pkg/configuration.h>
  20 #include <apt-pkg/policy.h>
  21 #include <apt-pkg/pkgsystem.h>
  22 #include <apt-pkg/acquire-item.h>
  23 #include <apt-pkg/fileutl.h>
  24
  25 #include <apti18n.h>
  26                                                                         /*}}}*/
  27 // CacheFile::CacheFile - Constructor                                   /*{{{*/
  28 // ---------------------------------------------------------------------
  29 /* */
  30 pkgCacheFile::pkgCacheFile() : Map(0), Cache(0), DCache(0), Policy(0)
  31 {
  32 }
  33                                                                         /*}}}*/
  34 // CacheFile::~CacheFile - Destructor                                   /*{{{*/
  35 // ---------------------------------------------------------------------
  36 /* */
  37 pkgCacheFile::~pkgCacheFile()
  38 {
  39    delete DCache;
  40    delete Policy;
  41    delete Cache;
  42    delete Map;
  43    _system->UnLock(true);
  44 }
  45                                                                         /*}}}*/
  46 // CacheFile::BuildCaches - Open and build the cache files              /*{{{*/
  47 // ---------------------------------------------------------------------
  48 /* */
  49 bool pkgCacheFile::BuildCaches(OpProgress &Progress,bool WithLock)
  50 {
  51    const bool ErrorWasEmpty = _error->empty();
  52    if (WithLock == true)
  53       if (_system->Lock() == false)
  54          return false;
  55
  56    if (_config->FindB("Debug::NoLocking",false) == true)
  57       WithLock = false;
  58
  59    if (_error->PendingError() == true)
  60       return false;
  61
  62    // Read the source list
  63    pkgSourceList List;
  64    if (List.ReadMainList() == false)
  65       return _error->Error(_("The list of sources could not be read."));
  66
  67    // Read the caches
  68    bool Res = pkgMakeStatusCache(List,Progress,&Map,!WithLock);
  69    Progress.Done();
  70    if (Res == false)
  71       return _error->Error(_("The package lists or status file could not be parsed or opened."));
  72
  73    /* This sux, remove it someday */
  74    if (ErrorWasEmpty == true && _error->empty() == false)
  75       _error->Warning(_("You may want to run apt-get update to correct these problems"));
  76
  77    Cache = new pkgCache(Map);
  78    if (_error->PendingError() == true)
  79       return false;
  80    return true;
  81 }
  82                                                                         /*}}}*/
  83 // CacheFile::Open - Open the cache files, creating if necessary        /*{{{*/
  84 // ---------------------------------------------------------------------
  85 /* */
  86 bool pkgCacheFile::Open(OpProgress &Progress,bool WithLock)
  87 {
  88    if (BuildCaches(Progress,WithLock) == false)
  89       return false;
  90
  91    // The policy engine
  92    Policy = new pkgPolicy(Cache);
  93    if (_error->PendingError() == true)
  94       return false;
  95
  96    if (ReadPinFile(*Policy) == false || ReadPinDir(*Policy) == false)
  97       return false;
  98
  99    // Create the dependency cache
 100    DCache = new pkgDepCache(Cache,Policy);
 101    if (_error->PendingError() == true)
 102       return false;
 103
 104    DCache->Init(&Progress);
 105    Progress.Done();
 106    if (_error->PendingError() == true)
 107       return false;
 108
 109    return true;
 110 }
 111                                                                         /*}}}*/
 112 // CacheFile::Close - close the cache files                             /*{{{*/
 113 // ---------------------------------------------------------------------
 114 /* */
 115 void pkgCacheFile::Close()
 116 {
 117    delete DCache;
 118    delete Policy;
 119    delete Cache;
 120    delete Map;
 121    _system->UnLock(true);
 122
 123    Map = 0;
 124    DCache = 0;
 125    Policy = 0;
 126    Cache = 0;
 127 }
 128                                                                         /*}}}*/