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 relevant
   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 <string>
  25 #include <sys/stat.h>
  26
  27 #include <apti18n.h>
  28                                                                         /*}}}*/
  29
  30 class FileMethod : public pkgAcqMethod
  31 {
  32    virtual bool Fetch(FetchItem *Itm);
  33
  34    public:
  35
  36    FileMethod() : pkgAcqMethod("1.0",SingleInstance | LocalOnly) {};
  37 };
  38
  39 // FileMethod::Fetch - Fetch a file                                     /*{{{*/
  40 // ---------------------------------------------------------------------
  41 /* */
  42 bool FileMethod::Fetch(FetchItem *Itm)
  43 {
  44    URI Get = Itm->Uri;
  45    std::string File = Get.Path;
  46    FetchResult Res;
  47    if (Get.Host.empty() == false)
  48       return _error->Error(_("Invalid URI, local URIS must not start with //"));
  49
  50    // See if the file exists
  51    struct stat Buf;
  52    if (stat(File.c_str(),&Buf) == 0)
  53    {
  54       Res.Size = Buf.st_size;
  55       Res.Filename = File;
  56       Res.LastModified = Buf.st_mtime;
  57       Res.IMSHit = false;
  58       if (Itm->LastModified == Buf.st_mtime && Itm->LastModified != 0)
  59          Res.IMSHit = true;
  60    }
  61
  62    // See if we can compute a file without a .gz exentsion
  63    std::string::size_type Pos = File.rfind(".gz");
  64    if (Pos + 3 == File.length())
  65    {
  66       File = std::string(File,0,Pos);
  67       if (stat(File.c_str(),&Buf) == 0)
  68       {
  69          FetchResult AltRes;
  70          AltRes.Size = Buf.st_size;
  71          AltRes.Filename = File;
  72          AltRes.LastModified = Buf.st_mtime;
  73          AltRes.IMSHit = false;
  74          if (Itm->LastModified == Buf.st_mtime && Itm->LastModified != 0)
  75             AltRes.IMSHit = true;
  76
  77          URIDone(Res,&AltRes);
  78          return true;
  79       }
  80    }
  81
  82    if (Res.Filename.empty() == true)
  83       return _error->Error(_("File not found"));
  84
  85    Hashes Hash;
  86    FileFd Fd(Res.Filename, FileFd::ReadOnly);
  87    Hash.AddFD(Fd);
  88    Res.TakeHashes(Hash);
  89    URIDone(Res);
  90    return true;
  91 }
  92                                                                         /*}}}*/
  93
  94 int main()
  95 {
  96    setlocale(LC_ALL, "");
  97
  98    FileMethod Mth;
  99    return Mth.Run();
 100 }