methods/cdrom.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: cdrom.cc,v 1.20.2.1 2004/01/16 18:58:50 mdz 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 #include <apt-pkg/hashes.h>
  17
  18 #include <sys/stat.h>
  19 #include <unistd.h>
  20
  21 #include <iostream>
  22 #include <apti18n.h>
  23                                                                         /*}}}*/
  24
  25 using namespace std;
  26
  27 class CDROMMethod : public pkgAcqMethod
  28 {
  29    bool DatabaseLoaded;
  30    ::Configuration Database;
  31    string CurrentID;
  32    string CDROM;
  33    bool Mounted;
  34
  35    virtual bool Fetch(FetchItem *Itm);
  36    string GetID(string Name);
  37    virtual void Exit();
  38
  39    public:
  40
  41    CDROMMethod();
  42 };
  43
  44 // CDROMMethod::CDROMethod - Constructor                                /*{{{*/
  45 // ---------------------------------------------------------------------
  46 /* */
  47 CDROMMethod::CDROMMethod() : pkgAcqMethod("1.0",SingleInstance | LocalOnly |
  48                                           SendConfig | NeedsCleanup |
  49                                           Removable),
  50                                           DatabaseLoaded(false),
  51                                           Mounted(false)
  52 {
  53 };
  54                                                                         /*}}}*/
  55 // CDROMMethod::Exit - Unmount the disc if necessary                    /*{{{*/
  56 // ---------------------------------------------------------------------
  57 /* */
  58 void CDROMMethod::Exit()
  59 {
  60    if (Mounted == true &&
  61        _config->FindB("APT::CDROM::UnMountOnFinish",true) == true)
  62       UnmountCdrom(CDROM);
  63 }
  64                                                                         /*}}}*/
  65 // CDROMMethod::GetID - Search the database for a matching string       /*{{{*/
  66 // ---------------------------------------------------------------------
  67 /* */
  68 string CDROMMethod::GetID(string Name)
  69 {
  70    // Search for an ID
  71    const Configuration::Item *Top = Database.Tree("CD");
  72    if (Top != 0)
  73       Top = Top->Child;
  74
  75    for (; Top != 0;)
  76    {
  77       if (Top->Value == Name)
  78          return Top->Tag;
  79
  80       Top = Top->Next;
  81    }
  82    return string();
  83 }
  84                                                                         /*}}}*/
  85 // CDROMMethod::Fetch - Fetch a file                                    /*{{{*/
  86 // ---------------------------------------------------------------------
  87 /* */
  88 bool CDROMMethod::Fetch(FetchItem *Itm)
  89 {
  90    URI Get = Itm->Uri;
  91    string File = Get.Path;
  92    FetchResult Res;
  93
  94    bool Debug = _config->FindB("Debug::Acquire::cdrom",false);
  95
  96    /* All IMS queries are returned as a hit, CDROMs are readonly so
  97       time stamps never change */
  98    if (Itm->LastModified != 0)
  99    {
 100       Res.LastModified = Itm->LastModified;
 101       Res.IMSHit = true;
 102       Res.Filename = Itm->DestFile;
 103       URIDone(Res);
 104       return true;
 105    }
 106
 107    // Load the database
 108    if (DatabaseLoaded == false)
 109    {
 110       // Read the database
 111       string DFile = _config->FindFile("Dir::State::cdroms");
 112       if (FileExists(DFile) == true)
 113       {
 114          if (ReadConfigFile(Database,DFile) == false)
 115             return _error->Error(_("Unable to read the cdrom database %s"),
 116                           DFile.c_str());
 117       }
 118       DatabaseLoaded = true;
 119    }
 120
 121    // All non IMS queries for package files fail.
 122    if (Itm->IndexFile == true || GetID(Get.Host).empty() == true)
 123    {
 124       Fail(_("Please use apt-cdrom to make this CD-ROM recognized by APT."
 125            " apt-get update cannot be used to add new CD-ROMs"));
 126       return true;
 127    }
 128
 129    // We already have a CD inserted, but it is the wrong one
 130    if (CurrentID.empty() == false && Database.Find("CD::" + CurrentID) != Get.Host)
 131    {
 132       Fail(_("Wrong CD-ROM"),true);
 133       return true;
 134    }
 135
 136    CDROM = _config->FindDir("Acquire::cdrom::mount","/cdrom/");
 137    if (CDROM[0] == '.')
 138       CDROM= SafeGetCWD() + '/' + CDROM;
 139    string NewID;
 140    while (CurrentID.empty() == true)
 141    {
 142       bool Hit = false;
 143       Mounted = MountCdrom(CDROM);
 144       for (unsigned int Version = 2; Version != 0; Version--)
 145       {
 146          if (IdentCdrom(CDROM,NewID,Version) == false)
 147             return false;
 148
 149          if (Debug == true)
 150             clog << "ID " << Version << " " << NewID << endl;
 151
 152          // A hit
 153          if (Database.Find("CD::" + NewID) == Get.Host)
 154          {
 155             Hit = true;
 156             break;
 157          }
 158       }
 159
 160       if (Hit == true)
 161          break;
 162
 163       // I suppose this should prompt somehow?
 164       if (_config->FindB("APT::CDROM::NoMount",false) == false &&
 165           UnmountCdrom(CDROM) == false)
 166          return _error->Error(_("Unable to unmount the CD-ROM in %s, it may still be in use."),
 167                               CDROM.c_str());
 168       if (MediaFail(Get.Host,CDROM) == false)
 169       {
 170          CurrentID = "FAIL";
 171          return _error->Error(_("Disk not found."));
 172       }
 173    }
 174
 175    // Found a CD
 176    Res.Filename = CDROM + File;
 177    struct stat Buf;
 178    if (stat(Res.Filename.c_str(),&Buf) != 0)
 179       return _error->Error(_("File not found"));
 180
 181    if (NewID.empty() == false)
 182       CurrentID = NewID;
 183    Res.LastModified = Buf.st_mtime;
 184    Res.Size = Buf.st_size;
 185
 186    Hashes Hash;
 187    FileFd Fd(Res.Filename, FileFd::ReadOnly);
 188    Hash.AddFD(Fd.Fd(), Fd.Size());
 189    Res.TakeHashes(Hash);
 190
 191    URIDone(Res);
 192    return true;
 193 }
 194                                                                         /*}}}*/
 195
 196 int main()
 197 {
 198    setlocale(LC_ALL, "");
 199
 200    CDROMMethod Mth;
 201    return Mth.Run();
 202 }