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 edspSystem edspSys;
  30
  31 // System::debSystem - Constructor                                      /*{{{*/
  32 edspSystem::edspSystem()
  33 {
  34    StatusFile = 0;
  35
  36    Label = "Debian APT solver interface";
  37    VS = &debVS;
  38 }
  39                                                                         /*}}}*/
  40 // System::~debSystem - Destructor                                      /*{{{*/
  41 edspSystem::~edspSystem()
  42 {
  43    delete StatusFile;
  44 }
  45                                                                         /*}}}*/
  46 // System::Lock - Get the lock                                          /*{{{*/
  47 bool edspSystem::Lock()
  48 {
  49    return true;
  50 }
  51                                                                         /*}}}*/
  52 // System::UnLock - Drop a lock                                         /*{{{*/
  53 bool edspSystem::UnLock(bool /*NoErrors*/)
  54 {
  55    return true;
  56 }
  57                                                                         /*}}}*/
  58 // System::CreatePM - Create the underlying package manager             /*{{{*/
  59 // ---------------------------------------------------------------------
  60 /* we can't use edsp input as input for real installations - just a
  61    simulation can work, but everything else will fail bigtime */
  62 pkgPackageManager *edspSystem::CreatePM(pkgDepCache * /*Cache*/) const
  63 {
  64    return NULL;
  65 }
  66                                                                         /*}}}*/
  67 // System::Initialize - Setup the configuration space..                 /*{{{*/
  68 bool edspSystem::Initialize(Configuration &Cnf)
  69 {
  70    Cnf.Set("Dir::State::extended_states", "/dev/null");
  71    Cnf.Set("Dir::State::status","/dev/null");
  72    Cnf.Set("Dir::State::lists","/dev/null");
  73
  74    Cnf.Set("Debug::NoLocking", "true");
  75    Cnf.Set("APT::Get::Simulate", "true");
  76
  77    if (StatusFile) {
  78      delete StatusFile;
  79      StatusFile = 0;
  80    }
  81    return true;
  82 }
  83                                                                         /*}}}*/
  84 // System::ArchiveSupported - Is a file format supported                /*{{{*/
  85 bool edspSystem::ArchiveSupported(const char * /*Type*/)
  86 {
  87    return false;
  88 }
  89                                                                         /*}}}*/
  90 // System::Score - Determine if we should use the edsp system           /*{{{*/
  91 signed edspSystem::Score(Configuration const &Cnf)
  92 {
  93    if (Cnf.Find("edsp::scenario", "") == "stdin")
  94       return 1000;
  95    if (RealFileExists(Cnf.FindFile("edsp::scenario","")) == true)
  96       return 1000;
  97    return -1000;
  98 }
  99                                                                         /*}}}*/
 100 // System::AddStatusFiles - Register the status files                   /*{{{*/
 101 bool edspSystem::AddStatusFiles(std::vector<pkgIndexFile *> &List)
 102 {
 103    if (StatusFile == 0)
 104    {
 105       if (_config->Find("edsp::scenario", "") == "stdin")
 106          StatusFile = new edspIndex("stdin");
 107       else
 108          StatusFile = new edspIndex(_config->FindFile("edsp::scenario"));
 109    }
 110    List.push_back(StatusFile);
 111    return true;
 112 }
 113                                                                         /*}}}*/
 114 // System::FindIndex - Get an index file for status files               /*{{{*/
 115 bool edspSystem::FindIndex(pkgCache::PkgFileIterator File,
 116                           pkgIndexFile *&Found) const
 117 {
 118    if (StatusFile == 0)
 119       return false;
 120    if (StatusFile->FindInCache(*File.Cache()) == File)
 121    {
 122       Found = StatusFile;
 123       return true;
 124    }
 125
 126    return false;
 127 }
 128                                                                         /*}}}*/