methods/cdrom.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: cdrom.cc,v 1.7 1998/12/22 08:20:55 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    if (Top != 0)
  67       Top = Top->Child;
  68
  69    for (; Top != 0;)
  70    {
  71       if (Top->Value == Name)
  72          return Top->Tag;
  73
  74       Top = Top->Next;
  75    }
  76
  77    return string();
  78 }
  79                                                                         /*}}}*/
  80 // CDROMMethod::Fetch - Fetch a file                                    /*{{{*/
  81 // ---------------------------------------------------------------------
  82 /* */
  83 bool CDROMMethod::Fetch(FetchItem *Itm)
  84 {
  85    URI Get = Itm->Uri;
  86    string File = Get.Path;
  87    FetchResult Res;
  88
  89    /* All IMS queries are returned as a hit, CDROMs are readonly so
  90       time stamps never change */
  91    if (Itm->LastModified != 0)
  92    {
  93       Res.LastModified = Itm->LastModified;
  94       Res.IMSHit = true;
  95       URIDone(Res);
  96       return true;
  97    }
  98
  99    string ID = GetID(Get.Host);
 100    if (_error->PendingError() == true)
 101       return false;
 102
 103    // All non IMS queries for package files fail.
 104    if (Itm->IndexFile == true || ID.empty() == true)
 105    {
 106       Fail("Please use apt-cdrom to make this CD recognized by APT."
 107            " apt-get update cannot be used to add new CDs");
 108       return true;
 109    }
 110
 111    // We already have a CD inserted, but it is the wrong one
 112    if (CurrentID.empty() == false && ID != CurrentID)
 113    {
 114       Fail("Wrong CD",true);
 115       return true;
 116    }
 117
 118    string CDROM = _config->FindDir("Acquire::cdrom::mount","/cdrom/");
 119    if (CDROM[0] == '.')
 120       CDROM= SafeGetCWD() + '/' + CDROM;
 121    string NewID;
 122    while (1)
 123    {
 124       if (IdentCdrom(CDROM,NewID) == false)
 125          return false;
 126
 127       // A hit
 128       if (NewID == ID)
 129          break;
 130
 131       UnmountCdrom(CDROM);
 132       if (MediaFail(Get.Host,CDROM) == false)
 133       {
 134          CurrentID = "FAIL";
 135          Fail("Wrong CD",true);
 136          return true;
 137       }
 138
 139       MountCdrom(CDROM);
 140    }
 141
 142    // ID matches
 143    if (NewID == ID)
 144    {
 145       Res.Filename = CDROM + File;
 146       struct stat Buf;
 147       if (stat(Res.Filename.c_str(),&Buf) != 0)
 148          return _error->Error("File not found");
 149
 150       CurrentID = ID;
 151       Res.LastModified = Buf.st_mtime;
 152       Res.IMSHit = true;
 153       Res.Size = Buf.st_size;
 154       URIDone(Res);
 155       return true;
 156    }
 157
 158    return _error->Error("CDROM not found");
 159 }
 160                                                                         /*}}}*/
 161
 162 int main()
 163 {
 164    CDROMMethod Mth;
 165    return Mth.Run();
 166 }