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    if (WithLock == true)
  52       if (_system->Lock() == false)
  53          return false;
  54
  55    if (_config->FindB("Debug::NoLocking",false) == true)
  56       WithLock = false;
  57
  58    if (_error->PendingError() == true)
  59       return false;
  60
  61    // Read the source list
  62    pkgSourceList List;
  63    if (List.ReadMainList() == false)
  64       return _error->Error(_("The list of sources could not be read."));
  65
  66    // Read the caches
  67    bool Res = pkgMakeStatusCache(List,Progress,&Map,!WithLock);
  68    Progress.Done();
  69    if (Res == false)
  70       return _error->Error(_("The package lists or status file could not be parsed or opened."));
  71
  72    /* This sux, remove it someday */
  73    if (_error->empty() == false)
  74       _error->Warning(_("You may want to run apt-get update to correct these problems"));
  75
  76    Cache = new pkgCache(Map);
  77    if (_error->PendingError() == true)
  78       return false;
  79    return true;
  80 }
  81                                                                         /*}}}*/
  82 // CacheFile::Open - Open the cache files, creating if necessary        /*{{{*/
  83 // ---------------------------------------------------------------------
  84 /* */
  85 bool pkgCacheFile::Open(OpProgress &Progress,bool WithLock)
  86 {
  87    if (BuildCaches(Progress,WithLock) == false)
  88       return false;
  89
  90    // The policy engine
  91    Policy = new pkgPolicy(Cache);
  92    if (_error->PendingError() == true)
  93       return false;
  94    if (ReadPinFile(*Policy) == false)
  95       return false;
  96
  97    // Create the dependency cache
  98    DCache = new pkgDepCache(Cache,Policy);
  99    if (_error->PendingError() == true)
 100       return false;
 101
 102    DCache->Init(&Progress);
 103    Progress.Done();
 104    if (_error->PendingError() == true)
 105       return false;
 106
 107    return true;
 108 }
 109                                                                         /*}}}*/
 110 // CacheFile::Close - close the cache files                             /*{{{*/
 111 // ---------------------------------------------------------------------
 112 /* */
 113 void pkgCacheFile::Close()
 114 {
 115    delete DCache;
 116    delete Policy;
 117    delete Cache;
 118    delete Map;
 119    _system->UnLock(true);
 120
 121    Map = 0;
 122    DCache = 0;
 123    Policy = 0;
 124    Cache = 0;
 125 }
 126                                                                         /*}}}*/