methods/cdrom.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: cdrom.cc,v 1.15 1999/10/02 04:14:54 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    bool DatabaseLoaded;
  24    ::Configuration Database;
  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       Res.Filename = File;
  81       URIDone(Res);
  82       return true;
  83    }
  84
  85    // Load the database
  86    if (DatabaseLoaded == false)
  87    {
  88       // Read the database
  89       string DFile = _config->FindFile("Dir::State::cdroms");
  90       if (FileExists(DFile) == true)
  91       {
  92          if (ReadConfigFile(Database,DFile) == false)
  93             return _error->Error("Unable to read the cdrom database %s",
  94                           DFile.c_str());
  95       }
  96       DatabaseLoaded = true;
  97    }
  98
  99    // All non IMS queries for package files fail.
 100    if (Itm->IndexFile == true || GetID(Get.Host).empty() == true)
 101    {
 102       Fail("Please use apt-cdrom to make this CD recognized by APT."
 103            " apt-get update cannot be used to add new CDs");
 104       return true;
 105    }
 106
 107    // We already have a CD inserted, but it is the wrong one
 108    if (CurrentID.empty() == false && Database.Find("CD::" + CurrentID) != Get.Host)
 109    {
 110       Fail("Wrong CD",true);
 111       return true;
 112    }
 113
 114    string CDROM = _config->FindDir("Acquire::cdrom::mount","/cdrom/");
 115    if (CDROM[0] == '.')
 116       CDROM= SafeGetCWD() + '/' + CDROM;
 117    string NewID;
 118    while (CurrentID.empty() == true)
 119    {
 120       bool Hit = false;
 121       for (unsigned int Version = 2; Version != 0; Version--)
 122       {
 123          if (IdentCdrom(CDROM,NewID,Version) == false)
 124             return false;
 125
 126          if (Debug == true)
 127             clog << "ID " << Version << " " << NewID << endl;
 128
 129          // A hit
 130          if (Database.Find("CD::" + NewID) == Get.Host)
 131          {
 132             Hit = true;
 133             break;
 134          }
 135       }
 136
 137       if (Hit == true)
 138          break;
 139
 140       // I suppose this should prompt somehow?
 141       if (UnmountCdrom(CDROM) == false)
 142          return _error->Error("Unable to unmount the CD-ROM in %s, it may still be in use.",
 143                               CDROM.c_str());
 144       if (MediaFail(Get.Host,CDROM) == false)
 145       {
 146          CurrentID = "FAIL";
 147          Fail("Wrong CD",true);
 148          return true;
 149       }
 150
 151       MountCdrom(CDROM);
 152    }
 153
 154    // Found a CD
 155    Res.Filename = CDROM + File;
 156    struct stat Buf;
 157    if (stat(Res.Filename.c_str(),&Buf) != 0)
 158       return _error->Error("File not found");
 159
 160    if (NewID.empty() == false)
 161       CurrentID = NewID;
 162    Res.LastModified = Buf.st_mtime;
 163    Res.IMSHit = true;
 164    Res.Size = Buf.st_size;
 165    URIDone(Res);
 166    return true;
 167 }
 168                                                                         /*}}}*/
 169
 170 int main()
 171 {
 172    CDROMMethod Mth;
 173    return Mth.Run();
 174 }