apt-pkg/edsp/edspsystem.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 /* ######################################################################
   4
   5    This system provides the abstraction to use the scenario file as the
   6    only source of package information to be able to feed the created file
   7    back to APT for its own consumption (eat your own dogfood).
   8
   9    ##################################################################### */
  10                                                                         /*}}}*/
  11 // Include Files                                                        /*{{{*/
  12 #include <config.h>
  13
  14 #include <apt-pkg/configuration.h>
  15 #include <apt-pkg/debversion.h>
  16 #include <apt-pkg/edspindexfile.h>
  17 #include <apt-pkg/edspsystem.h>
  18 #include <apt-pkg/fileutl.h>
  19 #include <apt-pkg/pkgcache.h>
  20 #include <apt-pkg/cacheiterators.h>
  21
  22 #include <stddef.h>
  23 #include <string>
  24 #include <vector>
  25
  26 #include <apti18n.h>
  27                                                                         /*}}}*/
  28
  29 // System::edspSystem - Constructor                                     /*{{{*/
  30 edspSystem::edspSystem() : pkgSystem("Debian APT solver interface", &debVS), d(NULL), StatusFile(NULL)
  31 {
  32 }
  33                                                                         /*}}}*/
  34 // System::~debSystem - Destructor                                      /*{{{*/
  35 edspSystem::~edspSystem()
  36 {
  37    delete StatusFile;
  38 }
  39                                                                         /*}}}*/
  40 // System::Lock - Get the lock                                          /*{{{*/
  41 bool edspSystem::Lock()
  42 {
  43    return true;
  44 }
  45                                                                         /*}}}*/
  46 // System::UnLock - Drop a lock                                         /*{{{*/
  47 bool edspSystem::UnLock(bool /*NoErrors*/)
  48 {
  49    return true;
  50 }
  51                                                                         /*}}}*/
  52 // System::CreatePM - Create the underlying package manager             /*{{{*/
  53 // ---------------------------------------------------------------------
  54 /* we can't use edsp input as input for real installations - just a
  55    simulation can work, but everything else will fail bigtime */
  56 pkgPackageManager *edspSystem::CreatePM(pkgDepCache * /*Cache*/) const
  57 {
  58    return NULL;
  59 }
  60                                                                         /*}}}*/
  61 // System::Initialize - Setup the configuration space..                 /*{{{*/
  62 bool edspSystem::Initialize(Configuration &Cnf)
  63 {
  64    Cnf.Set("Dir::State::extended_states", "/dev/null");
  65    Cnf.Set("Dir::State::status","/dev/null");
  66    Cnf.Set("Dir::State::lists","/dev/null");
  67
  68    Cnf.Set("Debug::NoLocking", "true");
  69    Cnf.Set("APT::Get::Simulate", "true");
  70
  71    if (StatusFile) {
  72      delete StatusFile;
  73      StatusFile = 0;
  74    }
  75    return true;
  76 }
  77                                                                         /*}}}*/
  78 // System::ArchiveSupported - Is a file format supported                /*{{{*/
  79 bool edspSystem::ArchiveSupported(const char * /*Type*/)
  80 {
  81    return false;
  82 }
  83                                                                         /*}}}*/
  84 // System::Score - Determine if we should use the edsp system           /*{{{*/
  85 signed edspSystem::Score(Configuration const &Cnf)
  86 {
  87    if (Cnf.Find("edsp::scenario", "") == "stdin")
  88       return 1000;
  89    if (RealFileExists(Cnf.FindFile("edsp::scenario","")) == true)
  90       return 1000;
  91    return -1000;
  92 }
  93                                                                         /*}}}*/
  94 // System::AddStatusFiles - Register the status files                   /*{{{*/
  95 bool edspSystem::AddStatusFiles(std::vector<pkgIndexFile *> &List)
  96 {
  97    if (StatusFile == 0)
  98    {
  99       if (_config->Find("edsp::scenario", "") == "stdin")
 100          StatusFile = new edspIndex("stdin");
 101       else
 102          StatusFile = new edspIndex(_config->FindFile("edsp::scenario"));
 103    }
 104    List.push_back(StatusFile);
 105    return true;
 106 }
 107                                                                         /*}}}*/
 108 // System::FindIndex - Get an index file for status files               /*{{{*/
 109 bool edspSystem::FindIndex(pkgCache::PkgFileIterator File,
 110                           pkgIndexFile *&Found) const
 111 {
 112    if (StatusFile == 0)
 113       return false;
 114    if (StatusFile->FindInCache(*File.Cache()) == File)
 115    {
 116       Found = StatusFile;
 117       return true;
 118    }
 119
 120    return false;
 121 }
 122                                                                         /*}}}*/
 123
 124 APT_HIDDEN edspSystem edspSys;