methods/file.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: file.cc,v 1.9.2.1 2004/01/16 18:58:50 mdz Exp $
   4 /* ######################################################################
   5
   6    File URI method for APT
   7
   8    This simply checks that the file specified exists, if so the relevent
   9    information is returned. If a .gz filename is specified then the file
  10    name with .gz removed will also be checked and information about it
  11    will be returned in Alt-*
  12
  13    ##################################################################### */
  14                                                                         /*}}}*/
  15 // Include Files                                                        /*{{{*/
  16 #include <config.h>
  17
  18 #include <apt-pkg/acquire-method.h>
  19 #include <apt-pkg/error.h>
  20 #include <apt-pkg/hashes.h>
  21 #include <apt-pkg/fileutl.h>
  22 #include <apt-pkg/strutl.h>
  23
  24 #include <sys/stat.h>
  25 #include <unistd.h>
  26 #include <apti18n.h>
  27                                                                         /*}}}*/
  28
  29 class FileMethod : public pkgAcqMethod
  30 {
  31    virtual bool Fetch(FetchItem *Itm);
  32
  33    public:
  34
  35    FileMethod() : pkgAcqMethod("1.0",SingleInstance | LocalOnly) {};
  36 };
  37
  38 // FileMethod::Fetch - Fetch a file                                     /*{{{*/
  39 // ---------------------------------------------------------------------
  40 /* */
  41 bool FileMethod::Fetch(FetchItem *Itm)
  42 {
  43    URI Get = Itm->Uri;
  44    std::string File = Get.Path;
  45    FetchResult Res;
  46    if (Get.Host.empty() == false)
  47       return _error->Error(_("Invalid URI, local URIS must not start with //"));
  48
  49    // See if the file exists
  50    struct stat Buf;
  51    if (stat(File.c_str(),&Buf) == 0)
  52    {
  53       Res.Size = Buf.st_size;
  54       Res.Filename = File;
  55       Res.LastModified = Buf.st_mtime;
  56       Res.IMSHit = false;
  57       if (Itm->LastModified == Buf.st_mtime && Itm->LastModified != 0)
  58          Res.IMSHit = true;
  59    }
  60
  61    // See if we can compute a file without a .gz exentsion
  62    std::string::size_type Pos = File.rfind(".gz");
  63    if (Pos + 3 == File.length())
  64    {
  65       File = std::string(File,0,Pos);
  66       if (stat(File.c_str(),&Buf) == 0)
  67       {
  68          FetchResult AltRes;
  69          AltRes.Size = Buf.st_size;
  70          AltRes.Filename = File;
  71          AltRes.LastModified = Buf.st_mtime;
  72          AltRes.IMSHit = false;
  73          if (Itm->LastModified == Buf.st_mtime && Itm->LastModified != 0)
  74             AltRes.IMSHit = true;
  75
  76          URIDone(Res,&AltRes);
  77          return true;
  78       }
  79    }
  80
  81    if (Res.Filename.empty() == true)
  82       return _error->Error(_("File not found"));
  83
  84    Hashes Hash;
  85    FileFd Fd(Res.Filename, FileFd::ReadOnly);
  86    Hash.AddFD(Fd);
  87    Res.TakeHashes(Hash);
  88    URIDone(Res);
  89    return true;
  90 }
  91                                                                         /*}}}*/
  92
  93 int main()
  94 {
  95    setlocale(LC_ALL, "");
  96
  97    FileMethod Mth;
  98    return Mth.Run();
  99 }