methods/cdrom.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: cdrom.cc,v 1.20 2003/02/10 07:34:41 doogie Exp $
   4 /* ######################################################################
   5
   6    CDROM URI method for APT
   7
   8    ##################################################################### */
   9                                                                         /*}}}*/
  10 // Include Files                                                        /*{{{*/
  11 #include <apti18n.h>
  12 #include <apt-pkg/acquire-method.h>
  13 #include <apt-pkg/cdromutl.h>
  14 #include <apt-pkg/error.h>
  15 #include <apt-pkg/configuration.h>
  16 #include <apt-pkg/fileutl.h>
  17
  18 #include <sys/stat.h>
  19 #include <unistd.h>
  20
  21 #include <iostream>
  22                                                                         /*}}}*/
  23
  24 using namespace std;
  25
  26 class CDROMMethod : public pkgAcqMethod
  27 {
  28    bool DatabaseLoaded;
  29    ::Configuration Database;
  30    string CurrentID;
  31    string CDROM;
  32    bool Mounted;
  33
  34    virtual bool Fetch(FetchItem *Itm);
  35    string GetID(string Name);
  36    virtual void Exit();
  37
  38    public:
  39
  40    CDROMMethod();
  41 };
  42
  43 // CDROMMethod::CDROMethod - Constructor                                /*{{{*/
  44 // ---------------------------------------------------------------------
  45 /* */
  46 CDROMMethod::CDROMMethod() : pkgAcqMethod("1.0",SingleInstance | LocalOnly |
  47                                           SendConfig | NeedsCleanup |
  48                                           Removable),
  49                                           DatabaseLoaded(false),
  50                                           Mounted(false)
  51 {
  52 };
  53                                                                         /*}}}*/
  54 // CDROMMethod::Exit - Unmount the disc if necessary                    /*{{{*/
  55 // ---------------------------------------------------------------------
  56 /* */
  57 void CDROMMethod::Exit()
  58 {
  59    if (Mounted == true)
  60       UnmountCdrom(CDROM);
  61 }
  62                                                                         /*}}}*/
  63 // CDROMMethod::GetID - Search the database for a matching string       /*{{{*/
  64 // ---------------------------------------------------------------------
  65 /* */
  66 string CDROMMethod::GetID(string Name)
  67 {
  68    // Search for an ID
  69    const Configuration::Item *Top = Database.Tree("CD");
  70    if (Top != 0)
  71       Top = Top->Child;
  72
  73    for (; Top != 0;)
  74    {
  75       if (Top->Value == Name)
  76          return Top->Tag;
  77
  78       Top = Top->Next;
  79    }
  80    return string();
  81 }
  82                                                                         /*}}}*/
  83 // CDROMMethod::Fetch - Fetch a file                                    /*{{{*/
  84 // ---------------------------------------------------------------------
  85 /* */
  86 bool CDROMMethod::Fetch(FetchItem *Itm)
  87 {
  88    URI Get = Itm->Uri;
  89    string File = Get.Path;
  90    FetchResult Res;
  91
  92    bool Debug = _config->FindB("Debug::Acquire::cdrom",false);
  93
  94    /* All IMS queries are returned as a hit, CDROMs are readonly so
  95       time stamps never change */
  96    if (Itm->LastModified != 0)
  97    {
  98       Res.LastModified = Itm->LastModified;
  99       Res.IMSHit = true;
 100       Res.Filename = File;
 101       URIDone(Res);
 102       return true;
 103    }
 104
 105    // Load the database
 106    if (DatabaseLoaded == false)
 107    {
 108       // Read the database
 109       string DFile = _config->FindFile("Dir::State::cdroms");
 110       if (FileExists(DFile) == true)
 111       {
 112          if (ReadConfigFile(Database,DFile) == false)
 113             return _error->Error(_("Unable to read the cdrom database %s"),
 114                           DFile.c_str());
 115       }
 116       DatabaseLoaded = true;
 117    }
 118
 119    // All non IMS queries for package files fail.
 120    if (Itm->IndexFile == true || GetID(Get.Host).empty() == true)
 121    {
 122       Fail(_("Please use apt-cdrom to make this CD recognized by APT."
 123            " apt-get update cannot be used to add new CDs"));
 124       return true;
 125    }
 126
 127    // We already have a CD inserted, but it is the wrong one
 128    if (CurrentID.empty() == false && Database.Find("CD::" + CurrentID) != Get.Host)
 129    {
 130       Fail(_("Wrong CD"),true);
 131       return true;
 132    }
 133
 134    CDROM = _config->FindDir("Acquire::cdrom::mount","/cdrom/");
 135    if (CDROM[0] == '.')
 136       CDROM= SafeGetCWD() + '/' + CDROM;
 137    string NewID;
 138    while (CurrentID.empty() == true)
 139    {
 140       bool Hit = false;
 141       Mounted = MountCdrom(CDROM);
 142       for (unsigned int Version = 2; Version != 0; Version--)
 143       {
 144          if (IdentCdrom(CDROM,NewID,Version) == false)
 145             return false;
 146
 147          if (Debug == true)
 148             clog << "ID " << Version << " " << NewID << endl;
 149
 150          // A hit
 151          if (Database.Find("CD::" + NewID) == Get.Host)
 152          {
 153             Hit = true;
 154             break;
 155          }
 156       }
 157
 158       if (Hit == true)
 159          break;
 160
 161       // I suppose this should prompt somehow?
 162       if (UnmountCdrom(CDROM) == false)
 163          return _error->Error(_("Unable to unmount the CD-ROM in %s, it may still be in use."),
 164                               CDROM.c_str());
 165       if (MediaFail(Get.Host,CDROM) == false)
 166       {
 167          CurrentID = "FAIL";
 168          Fail(_("Wrong CD"),true);
 169          return true;
 170       }
 171    }
 172
 173    // Found a CD
 174    Res.Filename = CDROM + File;
 175    struct stat Buf;
 176    if (stat(Res.Filename.c_str(),&Buf) != 0)
 177       return _error->Error(_("File not found"));
 178
 179    if (NewID.empty() == false)
 180       CurrentID = NewID;
 181    Res.LastModified = Buf.st_mtime;
 182    Res.Size = Buf.st_size;
 183    URIDone(Res);
 184    return true;
 185 }
 186                                                                         /*}}}*/
 187
 188 int main()
 189 {
 190    CDROMMethod Mth;
 191    return Mth.Run();
 192 }