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/strutl.h>
  20 #include <apt-pkg/hashes.h>
  21
  22 #include <sys/stat.h>
  23 #include <unistd.h>
  24 #include <dlfcn.h>
  25
  26 #include <iostream>
  27 #include <apti18n.h>
  28                                                                         /*}}}*/
  29
  30 using namespace std;
  31
  32 class CDROMMethod : public pkgAcqMethod
  33 {
  34    bool DatabaseLoaded;
  35    bool Debug;
  36
  37    ::Configuration Database;
  38    string CurrentID;
  39    string CDROM;
  40    bool MountedByApt;
  41    pkgUdevCdromDevices UdevCdroms;
  42
  43    bool IsCorrectCD(URI want, string MountPath, string& NewID);
  44    bool AutoDetectAndMount(const URI, string &NewID);
  45    virtual bool Fetch(FetchItem *Itm);
  46    string GetID(string Name);
  47    virtual void Exit();
  48
  49    public:
  50
  51    CDROMMethod();
  52 };
  53
  54 // CDROMMethod::CDROMethod - Constructor                                /*{{{*/
  55 // ---------------------------------------------------------------------
  56 /* */
  57 CDROMMethod::CDROMMethod() : pkgAcqMethod("1.0",SingleInstance | LocalOnly |
  58                                           SendConfig | NeedsCleanup |
  59                                           Removable),
  60                                           DatabaseLoaded(false),
  61                                           Debug(false),
  62                                           MountedByApt(false)
  63 {
  64    UdevCdroms.Dlopen();
  65 };
  66                                                                         /*}}}*/
  67 // CDROMMethod::Exit - Unmount the disc if necessary                    /*{{{*/
  68 // ---------------------------------------------------------------------
  69 /* */
  70 void CDROMMethod::Exit()
  71 {
  72   if (MountedByApt == true)
  73       UnmountCdrom(CDROM);
  74 }
  75                                                                         /*}}}*/
  76 // CDROMMethod::GetID - Search the database for a matching string       /*{{{*/
  77 // ---------------------------------------------------------------------
  78 /* */
  79 string CDROMMethod::GetID(string Name)
  80 {
  81    // Search for an ID
  82    const Configuration::Item *Top = Database.Tree("CD");
  83    if (Top != 0)
  84       Top = Top->Child;
  85
  86    for (; Top != 0;)
  87    {
  88       if (Top->Value == Name)
  89          return Top->Tag;
  90
  91       Top = Top->Next;
  92    }
  93    return string();
  94 }
  95                                                                         /*}}}*/
  96 // CDROMMethod::AutoDetectAndMount                                      /*{{{*/
  97 // ---------------------------------------------------------------------
  98 /* Modifies class varaiable CDROM to the mountpoint */
  99 bool CDROMMethod::AutoDetectAndMount(const URI Get, string &NewID)
 100 {
 101    vector<struct CdromDevice> v = UdevCdroms.Scan();
 102
 103    // first check if its mounted somewhere already
 104    for (unsigned int i=0; i < v.size(); i++)
 105    {
 106       if (v[i].Mounted)
 107       {
 108          if (Debug)
 109             clog << "Checking mounted cdrom device " << v[i].DeviceName << endl;
 110          if (IsCorrectCD(Get, v[i].MountPath, NewID))
 111          {
 112             CDROM = v[i].MountPath;
 113             return true;
 114          }
 115       }
 116    }
 117
 118    // we are not supposed to mount, exit
 119    if (_config->FindB("APT::CDROM::NoMount",false) == true)
 120       return false;
 121
 122    // check if we have the mount point
 123    string AptMountPoint = _config->FindDir("Dir::Media::MountPath");
 124    if (!FileExists(AptMountPoint))
 125       mkdir(AptMountPoint.c_str(), 0750);
 126
 127    // now try mounting
 128    for (unsigned int i=0; i < v.size(); i++)
 129    {
 130       if (!v[i].Mounted)
 131       {
 132          if(MountCdrom(AptMountPoint, v[i].DeviceName))
 133          {
 134             if (IsCorrectCD(Get, AptMountPoint, NewID))
 135             {
 136                MountedByApt = true;
 137                CDROM = AptMountPoint;
 138                return true;
 139             } else {
 140                UnmountCdrom(AptMountPoint);
 141             }
 142          }
 143       }
 144    }
 145
 146    return false;
 147 }
 148                                                                         /*}}}*/
 149 // CDROMMethod::IsCorrectCD                                             /*{{{*/
 150 // ---------------------------------------------------------------------
 151 /* */
 152 bool CDROMMethod::IsCorrectCD(URI want, string MountPath, string& NewID)
 153 {
 154    for (unsigned int Version = 2; Version != 0; Version--)
 155    {
 156       if (IdentCdrom(MountPath,NewID,Version) == false)
 157          return false;
 158
 159       if (Debug)
 160          clog << "ID " << Version << " " << NewID << endl;
 161
 162       // A hit
 163       if (Database.Find("CD::" + NewID) == want.Host)
 164          return true;
 165    }
 166
 167    return false;
 168 }
 169                                                                         /*}}}*/
 170 // CDROMMethod::Fetch - Fetch a file                                    /*{{{*/
 171 // ---------------------------------------------------------------------
 172 /* */
 173 bool CDROMMethod::Fetch(FetchItem *Itm)
 174 {
 175    FetchResult Res;
 176
 177    URI Get = Itm->Uri;
 178    string File = Get.Path;
 179    Debug = _config->FindB("Debug::Acquire::cdrom", false);
 180
 181    if (Debug)
 182       clog << "CDROMMethod::Fetch " << Itm->Uri << endl;
 183
 184    /* All IMS queries are returned as a hit, CDROMs are readonly so
 185       time stamps never change */
 186    if (Itm->LastModified != 0)
 187    {
 188       Res.LastModified = Itm->LastModified;
 189       Res.IMSHit = true;
 190       Res.Filename = Itm->DestFile;
 191       URIDone(Res);
 192       return true;
 193    }
 194
 195    // Load the database
 196    if (DatabaseLoaded == false)
 197    {
 198       // Read the database
 199       string DFile = _config->FindFile("Dir::State::cdroms");
 200       if (FileExists(DFile) == true)
 201       {
 202          if (ReadConfigFile(Database,DFile) == false)
 203             return _error->Error(_("Unable to read the cdrom database %s"),
 204                           DFile.c_str());
 205       }
 206       DatabaseLoaded = true;
 207    }
 208
 209    // All non IMS queries for package files fail.
 210    if (Itm->IndexFile == true || GetID(Get.Host).empty() == true)
 211    {
 212       Fail(_("Please use apt-cdrom to make this CD-ROM recognized by APT."
 213            " apt-get update cannot be used to add new CD-ROMs"));
 214       return true;
 215    }
 216
 217    // We already have a CD inserted, but it is the wrong one
 218    if (CurrentID.empty() == false &&
 219        CurrentID != "FAIL" &&
 220        Database.Find("CD::" + CurrentID) != Get.Host)
 221    {
 222       Fail(_("Wrong CD-ROM"),true);
 223       return true;
 224    }
 225
 226    bool AutoDetect = _config->FindB("Acquire::cdrom::AutoDetect", true);
 227    CDROM = _config->FindDir("Acquire::cdrom::mount");
 228    if (Debug)
 229       clog << "Looking for CDROM at " << CDROM << endl;
 230
 231    if (CDROM[0] == '.')
 232       CDROM= SafeGetCWD() + '/' + CDROM;
 233
 234    string NewID;
 235    while (CurrentID.empty() == true)
 236    {
 237       if (AutoDetect)
 238          AutoDetectAndMount(Get, NewID);
 239
 240       if(!IsMounted(CDROM))
 241          MountedByApt = MountCdrom(CDROM);
 242
 243       if (IsCorrectCD(Get, CDROM, NewID))
 244          break;
 245
 246       // I suppose this should prompt somehow?
 247       if (_config->FindB("APT::CDROM::NoMount",false) == false &&
 248           UnmountCdrom(CDROM) == false)
 249          return _error->Error(_("Unable to unmount the CD-ROM in %s, it may still be in use."),
 250                               CDROM.c_str());
 251       if (MediaFail(Get.Host,CDROM) == false)
 252       {
 253          CurrentID = "FAIL";
 254          return _error->Error(_("Disk not found."));
 255       }
 256    }
 257
 258    // Found a CD
 259    Res.Filename = CDROM + File;
 260    struct stat Buf;
 261    if (stat(Res.Filename.c_str(),&Buf) != 0)
 262       return _error->Error(_("File not found"));
 263
 264    if (NewID.empty() == false)
 265       CurrentID = NewID;
 266    Res.LastModified = Buf.st_mtime;
 267    Res.Size = Buf.st_size;
 268
 269    Hashes Hash;
 270    FileFd Fd(Res.Filename, FileFd::ReadOnly);
 271    Hash.AddFD(Fd);
 272    Res.TakeHashes(Hash);
 273
 274    URIDone(Res);
 275    return true;
 276 }
 277                                                                         /*}}}*/
 278
 279 int main()
 280 {
 281    setlocale(LC_ALL, "");
 282
 283    CDROMMethod Mth;
 284    return Mth.Run();
 285 }