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, string& NewID);
  41    bool AutoDetectAndMount(const URI, string &NewID);
  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(const URI Get, string &NewID)
  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, NewID))
 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", NewID))
 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, string& NewID)
 148 {
 149    for (unsigned int Version = 2; Version != 0; Version--)
 150    {
 151       if (IdentCdrom(MountPath,NewID,Version) == false)
 152          return false;
 153
 154       if (Debug)
 155          clog << "ID " << Version << " " << NewID << endl;
 156
 157       // A hit
 158       if (Database.Find("CD::" + NewID) == want.Host)
 159          return true;
 160    }
 161
 162    return false;
 163 }
 164                                                                         /*}}}*/
 165 // CDROMMethod::Fetch - Fetch a file                                    /*{{{*/
 166 // ---------------------------------------------------------------------
 167 /* */
 168 bool CDROMMethod::Fetch(FetchItem *Itm)
 169 {
 170    FetchResult Res;
 171
 172    URI Get = Itm->Uri;
 173    string File = Get.Path;
 174    Debug = _config->FindB("Debug::Acquire::cdrom", false);
 175
 176    if (Debug)
 177       clog << "CDROMMethod::Fetch " << Itm->Uri << endl;
 178
 179    /* All IMS queries are returned as a hit, CDROMs are readonly so
 180       time stamps never change */
 181    if (Itm->LastModified != 0)
 182    {
 183       Res.LastModified = Itm->LastModified;
 184       Res.IMSHit = true;
 185       Res.Filename = Itm->DestFile;
 186       URIDone(Res);
 187       return true;
 188    }
 189
 190    // Load the database
 191    if (DatabaseLoaded == false)
 192    {
 193       // Read the database
 194       string DFile = _config->FindFile("Dir::State::cdroms");
 195       if (FileExists(DFile) == true)
 196       {
 197          if (ReadConfigFile(Database,DFile) == false)
 198             return _error->Error(_("Unable to read the cdrom database %s"),
 199                           DFile.c_str());
 200       }
 201       DatabaseLoaded = true;
 202    }
 203
 204    // All non IMS queries for package files fail.
 205    if (Itm->IndexFile == true || GetID(Get.Host).empty() == true)
 206    {
 207       Fail(_("Please use apt-cdrom to make this CD-ROM recognized by APT."
 208            " apt-get update cannot be used to add new CD-ROMs"));
 209       return true;
 210    }
 211
 212    // We already have a CD inserted, but it is the wrong one
 213    if (CurrentID.empty() == false &&
 214        CurrentID != "FAIL" &&
 215        Database.Find("CD::" + CurrentID) != Get.Host)
 216    {
 217       Fail(_("Wrong CD-ROM"),true);
 218       return true;
 219    }
 220
 221    CDROM = _config->FindDir("Acquire::cdrom::mount","/cdrom/");
 222    if (Debug)
 223       clog << "Looking for CDROM at " << CDROM << endl;
 224
 225    if (CDROM[0] == '.')
 226       CDROM= SafeGetCWD() + '/' + CDROM;
 227
 228    string NewID;
 229    while (CurrentID.empty() == true)
 230    {
 231       if (CDROM == "apt-udev-auto/")
 232          AutoDetectAndMount(Get, NewID);
 233
 234       if(!IsMounted(CDROM))
 235          MountedByApt = MountCdrom(CDROM);
 236
 237       if (IsCorrectCD(Get, CDROM, NewID))
 238          break;
 239
 240       // I suppose this should prompt somehow?
 241       if (_config->FindB("APT::CDROM::NoMount",false) == false &&
 242           UnmountCdrom(CDROM) == false)
 243          return _error->Error(_("Unable to unmount the CD-ROM in %s, it may still be in use."),
 244                               CDROM.c_str());
 245       if (MediaFail(Get.Host,CDROM) == false)
 246       {
 247          CurrentID = "FAIL";
 248          return _error->Error(_("Disk not found."));
 249       }
 250    }
 251
 252    // Found a CD
 253    Res.Filename = CDROM + File;
 254    struct stat Buf;
 255    if (stat(Res.Filename.c_str(),&Buf) != 0)
 256       return _error->Error(_("File not found"));
 257
 258    if (NewID.empty() == false)
 259       CurrentID = NewID;
 260    Res.LastModified = Buf.st_mtime;
 261    Res.Size = Buf.st_size;
 262
 263    Hashes Hash;
 264    FileFd Fd(Res.Filename, FileFd::ReadOnly);
 265    Hash.AddFD(Fd.Fd(), Fd.Size());
 266    Res.TakeHashes(Hash);
 267
 268    URIDone(Res);
 269    return true;
 270 }
 271                                                                         /*}}}*/
 272
 273 int main()
 274 {
 275    setlocale(LC_ALL, "");
 276
 277    CDROMMethod Mth;
 278    return Mth.Run();
 279 }