methods/cdrom.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: cdrom.cc,v 1.6 1998/12/22 07:52:05 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             return string();
  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    if (_error->PendingError() == true)
  98       return false;
  99
 100    // All non IMS queries for package files fail.
 101    if (Itm->IndexFile == true || ID.empty() == true)
 102    {
 103       Fail("Please use apt-cdrom to make this CD recognized by APT."
 104            " apt-get update cannot be used to add new CDs");
 105       return true;
 106    }
 107
 108    // We already have a CD inserted, but it is the wrong one
 109    if (CurrentID.empty() == false && ID != CurrentID)
 110    {
 111       Fail("Wrong CD",true);
 112       return true;
 113    }
 114
 115    string CDROM = _config->FindDir("Acquire::cdrom::mount","/cdrom/");
 116    if (CDROM[0] == '.')
 117       CDROM= SafeGetCWD() + '/' + CDROM;
 118    string NewID;
 119    while (1)
 120    {
 121       if (IdentCdrom(CDROM,NewID) == false)
 122          return false;
 123
 124       // A hit
 125       if (NewID == ID)
 126          break;
 127
 128       UnmountCdrom(CDROM);
 129       if (MediaFail(Get.Host,CDROM) == false)
 130       {
 131          CurrentID = "FAIL";
 132          Fail("Wrong CD",true);
 133          return true;
 134       }
 135
 136       MountCdrom(CDROM);
 137    }
 138
 139    // ID matches
 140    if (NewID == ID)
 141    {
 142       Res.Filename = CDROM + File;
 143       if (FileExists(Res.Filename) == false)
 144          return _error->Error("File not found");
 145
 146       CurrentID = ID;
 147       Res.LastModified = Itm->LastModified;
 148       Res.IMSHit = true;
 149       URIDone(Res);
 150       return true;
 151    }
 152
 153    return _error->Error("CDROM not found");
 154 }
 155                                                                         /*}}}*/
 156
 157 int main()
 158 {
 159    CDROMMethod Mth;
 160    return Mth.Run();
 161 }