methods/cdrom.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: cdrom.cc,v 1.4 1998/12/22 07:36:49 jgg Exp $
   4 /* ######################################################################
   5
   6    CDROM URI method for APT
   7
   8    ##################################################################### */
   9                                                                         /*}}}*/
  10 // Include Files                                                        /*{{{*/
  11 #include <apt-pkg/acquire-method.h>
  12 #include <apt-pkg/cdromutl.h>
  13 #include <apt-pkg/error.h>
  14 #include <apt-pkg/configuration.h>
  15 #include <apt-pkg/fileutl.h>
  16
  17 #include <sys/stat.h>
  18 #include <unistd.h>
  19                                                                         /*}}}*/
  20
  21 class CDROMMethod : public pkgAcqMethod
  22 {
  23    Configuration Database;
  24    bool DatabaseLoaded;
  25    string CurrentID;
  26
  27    virtual bool Fetch(FetchItem *Itm);
  28    string GetID(string Name);
  29
  30    public:
  31
  32    CDROMMethod();
  33 };
  34
  35 // CDROMMethod::CDROMethod - Constructor                                /*{{{*/
  36 // ---------------------------------------------------------------------
  37 /* */
  38 CDROMMethod::CDROMMethod() : pkgAcqMethod("1.0",SingleInstance | LocalOnly |
  39                                           SendConfig), DatabaseLoaded(false)
  40 {
  41 };
  42                                                                         /*}}}*/
  43 // CDROMMethod::GetID - Get the ID hash for                                                                     /*{{{*/
  44 // ---------------------------------------------------------------------
  45 /* We search the configuration space for the name and then return the ID
  46    tag associated with it. */
  47 string CDROMMethod::GetID(string Name)
  48 {
  49    if (DatabaseLoaded == false)
  50    {
  51       // Read the database
  52       string DFile = _config->FindFile("Dir::State::cdroms");
  53       if (FileExists(DFile) == true)
  54       {
  55          if (ReadConfigFile(Database,DFile) == false)
  56          {
  57             _error->Error("Unable to read the cdrom database %s",
  58                           DFile.c_str());
  59             Fail();
  60          }
  61       }
  62       DatabaseLoaded = true;
  63    }
  64
  65    const Configuration::Item *Top = Database.Tree("CD");
  66    for (; Top != 0;)
  67    {
  68       if (Top->Value == Name)
  69          return Top->Tag;
  70
  71       Top = Top->Next;
  72    }
  73
  74    return string();
  75 }
  76                                                                         /*}}}*/
  77 // CDROMMethod::Fetch - Fetch a file                                    /*{{{*/
  78 // ---------------------------------------------------------------------
  79 /* */
  80 bool CDROMMethod::Fetch(FetchItem *Itm)
  81 {
  82    URI Get = Itm->Uri;
  83    string File = Get.Path;
  84    FetchResult Res;
  85
  86    /* All IMS queries are returned as a hit, CDROMs are readonly so
  87       time stamps never change */
  88    if (Itm->LastModified != 0)
  89    {
  90       Res.LastModified = Itm->LastModified;
  91       Res.IMSHit = true;
  92       URIDone(Res);
  93       return true;
  94    }
  95
  96    string ID = GetID(Get.Host);
  97
  98    // All non IMS queries for package files fail.
  99    if (Itm->IndexFile == true || ID.empty() == true)
 100    {
 101       Fail("Please use apt-cdrom to make this CD recognized by APT."
 102            " apt-get update cannot be used to add new CDs");
 103       return true;
 104    }
 105
 106    // We already have a CD inserted, but it is the wrong one
 107    if (CurrentID.empty() == false && ID != CurrentID)
 108    {
 109       Fail("Wrong CD",true);
 110       return true;
 111    }
 112
 113    string CDROM = _config->FindDir("Acquire::cdrom::mount","/cdrom/");
 114    if (CDROM[0] == '.')
 115       CDROM= SafeGetCWD() + '/' + CDROM;
 116    string NewID;
 117    while (1)
 118    {
 119       if (IdentCdrom(CDROM,NewID) == false)
 120          return false;
 121
 122       // A hit
 123       if (NewID == ID)
 124          break;
 125
 126       UnmountCdrom(CDROM);
 127       if (MediaFail(Get.Host,CDROM) == false)
 128       {
 129          CurrentID = "FAIL";
 130          Fail("Wrong CD",true);
 131          return true;
 132       }
 133
 134       MountCdrom(CDROM);
 135    }
 136
 137    // ID matches
 138    if (NewID == ID)
 139    {
 140       Res.Filename = CDROM + File;
 141       if (FileExists(Res.Filename) == false)
 142          return _error->Error("File not found");
 143
 144       CurrentID = ID;
 145       Res.LastModified = Itm->LastModified;
 146       Res.IMSHit = true;
 147       URIDone(Res);
 148       return true;
 149    }
 150
 151    return _error->Error("CDROM not found");
 152 }
 153                                                                         /*}}}*/
 154
 155 int main()
 156 {
 157    CDROMMethod Mth;
 158    return Mth.Run();
 159 }