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 <config.h>
  12
  13 #include <apt-pkg/acquire-method.h>
  14 #include <apt-pkg/cdrom.h>
  15 #include <apt-pkg/cdromutl.h>
  16 #include <apt-pkg/error.h>
  17 #include <apt-pkg/configuration.h>
  18 #include <apt-pkg/fileutl.h>
  19 #include <apt-pkg/hashes.h>
  20
  21 #include <sys/stat.h>
  22 #include <unistd.h>
  23 #include <dlfcn.h>
  24
  25 #include <iostream>
  26 #include <apti18n.h>
  27                                                                         /*}}}*/
  28
  29 using namespace std;
  30
  31 class CDROMMethod : public pkgAcqMethod
  32 {
  33    bool DatabaseLoaded;
  34    bool Debug;
  35
  36    ::Configuration Database;
  37    string CurrentID;
  38    string CDROM;
  39    bool MountedByApt;
  40    pkgUdevCdromDevices UdevCdroms;
  41
  42    bool IsCorrectCD(URI want, string MountPath, string& NewID);
  43    bool AutoDetectAndMount(const URI, string &NewID);
  44    virtual bool Fetch(FetchItem *Itm);
  45    string GetID(string Name);
  46    virtual void Exit();
  47
  48    public:
  49
  50    CDROMMethod();
  51 };
  52
  53 // CDROMMethod::CDROMethod - Constructor                                /*{{{*/
  54 // ---------------------------------------------------------------------
  55 /* */
  56 CDROMMethod::CDROMMethod() : pkgAcqMethod("1.0",SingleInstance | LocalOnly |
  57                                           SendConfig | NeedsCleanup |
  58                                           Removable),
  59                                           DatabaseLoaded(false),
  60                                           MountedByApt(false)
  61 {
  62    UdevCdroms.Dlopen();
  63 };
  64                                                                         /*}}}*/
  65 // CDROMMethod::Exit - Unmount the disc if necessary                    /*{{{*/
  66 // ---------------------------------------------------------------------
  67 /* */
  68 void CDROMMethod::Exit()
  69 {
  70   if (MountedByApt == true)
  71       UnmountCdrom(CDROM);
  72 }
  73                                                                         /*}}}*/
  74 // CDROMMethod::GetID - Search the database for a matching string       /*{{{*/
  75 // ---------------------------------------------------------------------
  76 /* */
  77 string CDROMMethod::GetID(string Name)
  78 {
  79    // Search for an ID
  80    const Configuration::Item *Top = Database.Tree("CD");
  81    if (Top != 0)
  82       Top = Top->Child;
  83
  84    for (; Top != 0;)
  85    {
  86       if (Top->Value == Name)
  87          return Top->Tag;
  88
  89       Top = Top->Next;
  90    }
  91    return string();
  92 }
  93                                                                         /*}}}*/
  94 // CDROMMethod::AutoDetectAndMount                                      /*{{{*/
  95 // ---------------------------------------------------------------------
  96 /* Modifies class varaiable CDROM to the mountpoint */
  97 bool CDROMMethod::AutoDetectAndMount(const URI Get, string &NewID)
  98 {
  99    vector<struct CdromDevice> v = UdevCdroms.Scan();
 100
 101    // first check if its mounted somewhere already
 102    for (unsigned int i=0; i < v.size(); i++)
 103    {
 104       if (v[i].Mounted)
 105       {
 106          if (Debug)
 107             clog << "Checking mounted cdrom device " << v[i].DeviceName << endl;
 108          if (IsCorrectCD(Get, v[i].MountPath, NewID))
 109          {
 110             CDROM = v[i].MountPath;
 111             return true;
 112          }
 113       }
 114    }
 115
 116    // we are not supposed to mount, exit
 117    if (_config->FindB("APT::CDROM::NoMount",false) == true)
 118       return false;
 119
 120    // check if we have the mount point
 121    string AptMountPoint = _config->FindDir("Dir::Media::MountPath");
 122    if (!FileExists(AptMountPoint))
 123       mkdir(AptMountPoint.c_str(), 0750);
 124
 125    // now try mounting
 126    for (unsigned int i=0; i < v.size(); i++)
 127    {
 128       if (!v[i].Mounted)
 129       {
 130          if(MountCdrom(AptMountPoint, v[i].DeviceName))
 131          {
 132             if (IsCorrectCD(Get, AptMountPoint, NewID))
 133             {
 134                MountedByApt = true;
 135                CDROM = AptMountPoint;
 136                return true;
 137             } else {
 138                UnmountCdrom(AptMountPoint);
 139             }
 140          }
 141       }
 142    }
 143
 144    return false;
 145 }
 146                                                                         /*}}}*/
 147 // CDROMMethod::IsCorrectCD                                             /*{{{*/
 148 // ---------------------------------------------------------------------
 149 /* */
 150 bool CDROMMethod::IsCorrectCD(URI want, string MountPath, string& NewID)
 151 {
 152    for (unsigned int Version = 2; Version != 0; Version--)
 153    {
 154       if (IdentCdrom(MountPath,NewID,Version) == false)
 155          return false;
 156
 157       if (Debug)
 158          clog << "ID " << Version << " " << NewID << endl;
 159
 160       // A hit
 161       if (Database.Find("CD::" + NewID) == want.Host)
 162          return true;
 163    }
 164
 165    return false;
 166 }
 167                                                                         /*}}}*/
 168 // CDROMMethod::Fetch - Fetch a file                                    /*{{{*/
 169 // ---------------------------------------------------------------------
 170 /* */
 171 bool CDROMMethod::Fetch(FetchItem *Itm)
 172 {
 173    FetchResult Res;
 174
 175    URI Get = Itm->Uri;
 176    string File = Get.Path;
 177    Debug = _config->FindB("Debug::Acquire::cdrom", false);
 178
 179    if (Debug)
 180       clog << "CDROMMethod::Fetch " << Itm->Uri << endl;
 181
 182    /* All IMS queries are returned as a hit, CDROMs are readonly so
 183       time stamps never change */
 184    if (Itm->LastModified != 0)
 185    {
 186       Res.LastModified = Itm->LastModified;
 187       Res.IMSHit = true;
 188       Res.Filename = Itm->DestFile;
 189       URIDone(Res);
 190       return true;
 191    }
 192
 193    // Load the database
 194    if (DatabaseLoaded == false)
 195    {
 196       // Read the database
 197       string DFile = _config->FindFile("Dir::State::cdroms");
 198       if (FileExists(DFile) == true)
 199       {
 200          if (ReadConfigFile(Database,DFile) == false)
 201             return _error->Error(_("Unable to read the cdrom database %s"),
 202                           DFile.c_str());
 203       }
 204       DatabaseLoaded = true;
 205    }
 206
 207    // All non IMS queries for package files fail.
 208    if (Itm->IndexFile == true || GetID(Get.Host).empty() == true)
 209    {
 210       Fail(_("Please use apt-cdrom to make this CD-ROM recognized by APT."
 211            " apt-get update cannot be used to add new CD-ROMs"));
 212       return true;
 213    }
 214
 215    // We already have a CD inserted, but it is the wrong one
 216    if (CurrentID.empty() == false &&
 217        CurrentID != "FAIL" &&
 218        Database.Find("CD::" + CurrentID) != Get.Host)
 219    {
 220       Fail(_("Wrong CD-ROM"),true);
 221       return true;
 222    }
 223
 224    bool AutoDetect = _config->FindB("Acquire::cdrom::AutoDetect", true);
 225    CDROM = _config->FindDir("Acquire::cdrom::mount");
 226    if (Debug)
 227       clog << "Looking for CDROM at " << CDROM << endl;
 228
 229    if (CDROM[0] == '.')
 230       CDROM= SafeGetCWD() + '/' + CDROM;
 231
 232    string NewID;
 233    while (CurrentID.empty() == true)
 234    {
 235       if (AutoDetect)
 236          AutoDetectAndMount(Get, NewID);
 237
 238       if(!IsMounted(CDROM))
 239          MountedByApt = MountCdrom(CDROM);
 240
 241       if (IsCorrectCD(Get, CDROM, NewID))
 242          break;
 243
 244       // I suppose this should prompt somehow?
 245       if (_config->FindB("APT::CDROM::NoMount",false) == false &&
 246           UnmountCdrom(CDROM) == false)
 247          return _error->Error(_("Unable to unmount the CD-ROM in %s, it may still be in use."),
 248                               CDROM.c_str());
 249       if (MediaFail(Get.Host,CDROM) == false)
 250       {
 251          CurrentID = "FAIL";
 252          return _error->Error(_("Disk not found."));
 253       }
 254    }
 255
 256    // Found a CD
 257    Res.Filename = CDROM + File;
 258    struct stat Buf;
 259    if (stat(Res.Filename.c_str(),&Buf) != 0)
 260       return _error->Error(_("File not found"));
 261
 262    if (NewID.empty() == false)
 263       CurrentID = NewID;
 264    Res.LastModified = Buf.st_mtime;
 265    Res.Size = Buf.st_size;
 266
 267    Hashes Hash;
 268    FileFd Fd(Res.Filename, FileFd::ReadOnly);
 269    Hash.AddFD(Fd.Fd(), Fd.Size());
 270    Res.TakeHashes(Hash);
 271
 272    URIDone(Res);
 273    return true;
 274 }
 275                                                                         /*}}}*/
 276
 277 int main()
 278 {
 279    setlocale(LC_ALL, "");
 280
 281    CDROMMethod Mth;
 282    return Mth.Run();
 283 }