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/cdrom.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 #include <apt-pkg/hashes.h>
  18
  19 #include <sys/stat.h>
  20 #include <unistd.h>
  21 #include <dlfcn.h>
  22
  23 #include <iostream>
  24 #include <apti18n.h>
  25                                                                         /*}}}*/
  26
  27 using namespace std;
  28
  29 class CDROMMethod : public pkgAcqMethod
  30 {
  31    bool DatabaseLoaded;
  32    bool Debug;
  33
  34    ::Configuration Database;
  35    string CurrentID;
  36    string CDROM;
  37    bool MountedByApt;
  38    pkgUdevCdromDevices UdevCdroms;
  39
  40    bool IsCorrectCD(URI want, string MountPath);
  41    bool AutoDetectAndMount(URI);
  42    virtual bool Fetch(FetchItem *Itm);
  43    string GetID(string Name);
  44    virtual void Exit();
  45
  46    public:
  47
  48    CDROMMethod();
  49 };
  50
  51 // CDROMMethod::CDROMethod - Constructor                                /*{{{*/
  52 // ---------------------------------------------------------------------
  53 /* */
  54 CDROMMethod::CDROMMethod() : pkgAcqMethod("1.0",SingleInstance | LocalOnly |
  55                                           SendConfig | NeedsCleanup |
  56                                           Removable),
  57                                           DatabaseLoaded(false),
  58                                           MountedByApt(false)
  59 {
  60    UdevCdroms.Dlopen();
  61 };
  62                                                                         /*}}}*/
  63 // CDROMMethod::Exit - Unmount the disc if necessary                    /*{{{*/
  64 // ---------------------------------------------------------------------
  65 /* */
  66 void CDROMMethod::Exit()
  67 {
  68   if (MountedByApt == true)
  69       UnmountCdrom(CDROM);
  70 }
  71                                                                         /*}}}*/
  72 // CDROMMethod::GetID - Search the database for a matching string       /*{{{*/
  73 // ---------------------------------------------------------------------
  74 /* */
  75 string CDROMMethod::GetID(string Name)
  76 {
  77    // Search for an ID
  78    const Configuration::Item *Top = Database.Tree("CD");
  79    if (Top != 0)
  80       Top = Top->Child;
  81
  82    for (; Top != 0;)
  83    {
  84       if (Top->Value == Name)
  85          return Top->Tag;
  86
  87       Top = Top->Next;
  88    }
  89    return string();
  90 }
  91                                                                         /*}}}*/
  92 // CDROMMethod::AutoDetectAndMount                                      /*{{{*/
  93 // ---------------------------------------------------------------------
  94 /* Modifies class varaiable CDROM to the mountpoint */
  95 bool CDROMMethod::AutoDetectAndMount(URI Get)
  96 {
  97    vector<struct CdromDevice> v = UdevCdroms.Scan();
  98
  99    // first check if its mounted somewhere already
 100    for (unsigned int i=0; i < v.size(); i++)
 101    {
 102       if (v[i].Mounted)
 103       {
 104          if (Debug)
 105             clog << "Checking mounted cdrom device " << v[i].DeviceName << endl;
 106          if (IsCorrectCD(Get, v[i].MountPath))
 107          {
 108             CDROM = v[i].MountPath;
 109             return true;
 110          }
 111       }
 112    }
 113
 114    // we are not supposed to mount, exit
 115    if (_config->FindB("APT::CDROM::NoMount",false) == true)
 116       return false;
 117
 118    // check if we have the mount point
 119    if (!FileExists("/media/apt"))
 120       mkdir("/media/apt", 0755);
 121
 122    // now try mounting
 123    for (unsigned int i=0; i < v.size(); i++)
 124    {
 125       if (!v[i].Mounted)
 126       {
 127          if(MountCdrom("/media/apt", v[i].DeviceName))
 128          {
 129             if (IsCorrectCD(Get, "/media/apt"))
 130             {
 131                MountedByApt = true;
 132                CDROM = "/media/apt";
 133                return true;
 134             } else {
 135                UnmountCdrom("/media/apt");
 136             }
 137          }
 138       }
 139    }
 140
 141    return false;
 142 }
 143                                                                         /*}}}*/
 144 // CDROMMethod::IsCorrectCD                                             /*{{{*/
 145 // ---------------------------------------------------------------------
 146 /* */
 147 bool CDROMMethod::IsCorrectCD(URI want, string MountPath)
 148 {
 149    string NewID;
 150
 151    for (unsigned int Version = 2; Version != 0; Version--)
 152    {
 153       if (IdentCdrom(MountPath,NewID,Version) == false)
 154          return false;
 155
 156       if (Debug)
 157          clog << "ID " << Version << " " << NewID << endl;
 158
 159       // A hit
 160       if (Database.Find("CD::" + NewID) == want.Host)
 161          return true;
 162    }
 163
 164    return false;
 165 }
 166                                                                         /*}}}*/
 167 // CDROMMethod::Fetch - Fetch a file                                    /*{{{*/
 168 // ---------------------------------------------------------------------
 169 /* */
 170 bool CDROMMethod::Fetch(FetchItem *Itm)
 171 {
 172    FetchResult Res;
 173
 174    URI Get = Itm->Uri;
 175    string File = Get.Path;
 176    Debug = _config->FindB("Debug::Acquire::cdrom", false);
 177
 178    if (Debug)
 179       clog << "CDROMMethod::Fetch " << Itm->Uri << endl;
 180
 181    /* All IMS queries are returned as a hit, CDROMs are readonly so
 182       time stamps never change */
 183    if (Itm->LastModified != 0)
 184    {
 185       Res.LastModified = Itm->LastModified;
 186       Res.IMSHit = true;
 187       Res.Filename = Itm->DestFile;
 188       URIDone(Res);
 189       return true;
 190    }
 191
 192    // Load the database
 193    if (DatabaseLoaded == false)
 194    {
 195       // Read the database
 196       string DFile = _config->FindFile("Dir::State::cdroms");
 197       if (FileExists(DFile) == true)
 198       {
 199          if (ReadConfigFile(Database,DFile) == false)
 200             return _error->Error(_("Unable to read the cdrom database %s"),
 201                           DFile.c_str());
 202       }
 203       DatabaseLoaded = true;
 204    }
 205
 206    // All non IMS queries for package files fail.
 207    if (Itm->IndexFile == true || GetID(Get.Host).empty() == true)
 208    {
 209       Fail(_("Please use apt-cdrom to make this CD-ROM recognized by APT."
 210            " apt-get update cannot be used to add new CD-ROMs"));
 211       return true;
 212    }
 213
 214    // We already have a CD inserted, but it is the wrong one
 215    if (CurrentID.empty() == false &&
 216        CurrentID != "FAIL" &&
 217        Database.Find("CD::" + CurrentID) != Get.Host)
 218    {
 219       Fail(_("Wrong CD-ROM"),true);
 220       return true;
 221    }
 222
 223    CDROM = _config->FindDir("Acquire::cdrom::mount","/cdrom/");
 224    if (Debug)
 225       clog << "Looking for CDROM at " << CDROM << endl;
 226
 227    if (CDROM[0] == '.')
 228       CDROM= SafeGetCWD() + '/' + CDROM;
 229    string NewID;
 230
 231    while (CurrentID.empty() == true)
 232    {
 233       if (CDROM == "apt-udev-auto/")
 234          AutoDetectAndMount(Get);
 235
 236       if(!IsMounted(CDROM))
 237          MountedByApt = MountCdrom(CDROM);
 238
 239       if (IsCorrectCD(Get, CDROM))
 240          break;
 241
 242       // I suppose this should prompt somehow?
 243       if (_config->FindB("APT::CDROM::NoMount",false) == false &&
 244           UnmountCdrom(CDROM) == false)
 245          return _error->Error(_("Unable to unmount the CD-ROM in %s, it may still be in use."),
 246                               CDROM.c_str());
 247       if (MediaFail(Get.Host,CDROM) == false)
 248       {
 249          CurrentID = "FAIL";
 250          return _error->Error(_("Disk not found."));
 251       }
 252    }
 253
 254    // Found a CD
 255    Res.Filename = CDROM + File;
 256    struct stat Buf;
 257    if (stat(Res.Filename.c_str(),&Buf) != 0)
 258       return _error->Error(_("File not found"));
 259
 260    if (NewID.empty() == false)
 261       CurrentID = NewID;
 262    Res.LastModified = Buf.st_mtime;
 263    Res.Size = Buf.st_size;
 264
 265    Hashes Hash;
 266    FileFd Fd(Res.Filename, FileFd::ReadOnly);
 267    Hash.AddFD(Fd.Fd(), Fd.Size());
 268    Res.TakeHashes(Hash);
 269
 270    URIDone(Res);
 271    return true;
 272 }
 273                                                                         /*}}}*/
 274
 275 int main()
 276 {
 277    setlocale(LC_ALL, "");
 278
 279    CDROMMethod Mth;
 280    return Mth.Run();
 281 }