methods/cdrom.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: cdrom.cc,v 1.11 1999/06/09 23:06:39 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 - Search the database for a matching string       /*{{{*/
  44 // ---------------------------------------------------------------------
  45 /* */
  46 string CDROMMethod::GetID(string Name)
  47 {
  48    // Search for an ID
  49    const Configuration::Item *Top = Database.Tree("CD");
  50    if (Top != 0)
  51       Top = Top->Child;
  52
  53    for (; Top != 0;)
  54    {
  55       if (Top->Value == Name)
  56          return Top->Tag;
  57
  58       Top = Top->Next;
  59    }
  60    return string();
  61 }
  62                                                                         /*}}}*/
  63 // CDROMMethod::Fetch - Fetch a file                                    /*{{{*/
  64 // ---------------------------------------------------------------------
  65 /* */
  66 bool CDROMMethod::Fetch(FetchItem *Itm)
  67 {
  68    URI Get = Itm->Uri;
  69    string File = Get.Path;
  70    FetchResult Res;
  71
  72    bool Debug = _config->FindB("Debug::Acquire::cdrom",false);
  73
  74    /* All IMS queries are returned as a hit, CDROMs are readonly so
  75       time stamps never change */
  76    if (Itm->LastModified != 0)
  77    {
  78       Res.LastModified = Itm->LastModified;
  79       Res.IMSHit = true;
  80       URIDone(Res);
  81       return true;
  82    }
  83
  84    // Load the database
  85    if (DatabaseLoaded == false)
  86    {
  87       // Read the database
  88       string DFile = _config->FindFile("Dir::State::cdroms");
  89       if (FileExists(DFile) == true)
  90       {
  91          if (ReadConfigFile(Database,DFile) == false)
  92             return _error->Error("Unable to read the cdrom database %s",
  93                           DFile.c_str());
  94       }
  95       DatabaseLoaded = true;
  96    }
  97
  98    // All non IMS queries for package files fail.
  99    if (Itm->IndexFile == true || GetID(Get.Host).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 && Database.Find("CD::" + CurrentID) != Get.Host)
 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       bool Hit = false;
 120       for (unsigned int Version = 2; Version != 0; Version--)
 121       {
 122          if (IdentCdrom(CDROM,NewID,Version) == false)
 123             return false;
 124
 125          if (Debug == true)
 126             clog << "ID " << Version << " " << NewID << endl;
 127
 128          // A hit
 129          if (Database.Find("CD::" + NewID) == Get.Host)
 130          {
 131             Hit = true;
 132             break;
 133          }
 134       }
 135
 136       if (Hit == true)
 137          break;
 138
 139       // I suppose this should prompt somehow?
 140       if (UnmountCdrom(CDROM) == false)
 141          return _error->Error("Unable to unmount the CD-ROM in %s, it may still be in use.",
 142                               CDROM.c_str());
 143       if (MediaFail(Get.Host,CDROM) == false)
 144       {
 145          CurrentID = "FAIL";
 146          Fail("Wrong CD",true);
 147          return true;
 148       }
 149
 150       MountCdrom(CDROM);
 151    }
 152
 153    // Found a CD
 154    Res.Filename = CDROM + File;
 155    struct stat Buf;
 156    if (stat(Res.Filename.c_str(),&Buf) != 0)
 157       return _error->Error("File not found");
 158
 159    CurrentID = NewID;
 160    Res.LastModified = Buf.st_mtime;
 161    Res.IMSHit = true;
 162    Res.Size = Buf.st_size;
 163    URIDone(Res);
 164    return true;
 165 }
 166                                                                         /*}}}*/
 167
 168 int main()
 169 {
 170    CDROMMethod Mth;
 171    return Mth.Run();
 172 }