methods/file.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: file.cc,v 1.6 1998/11/14 01:39:49 jgg 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 <apt-pkg/acquire-method.h>
  17 #include <apt-pkg/error.h>
  18
  19 #include <sys/stat.h>
  20 #include <unistd.h>
  21                                                                         /*}}}*/
  22
  23 class FileMethod : public pkgAcqMethod
  24 {
  25    virtual bool Fetch(FetchItem *Itm);
  26
  27    public:
  28
  29    FileMethod() : pkgAcqMethod("1.0",SingleInstance | LocalOnly) {};
  30 };
  31
  32 // FileMethod::Fetch - Fetch a file                                     /*{{{*/
  33 // ---------------------------------------------------------------------
  34 /* */
  35 bool FileMethod::Fetch(FetchItem *Itm)
  36 {
  37    URI Get = Itm->Uri;
  38    string File = Get.Path;
  39    FetchResult Res;
  40
  41    // See if the file exists
  42    struct stat Buf;
  43    if (stat(File.c_str(),&Buf) == 0)
  44    {
  45       Res.Size = Buf.st_size;
  46       Res.Filename = File;
  47       Res.LastModified = Buf.st_mtime;
  48       Res.IMSHit = false;
  49       if (Itm->LastModified == Buf.st_mtime)
  50          Res.IMSHit = true;
  51    }
  52
  53    // See if we can compute a file without a .gz exentsion
  54    string::size_type Pos = File.rfind(".gz");
  55    if (Pos + 3 == File.length())
  56    {
  57       File = string(File,0,Pos);
  58       if (stat(File.c_str(),&Buf) == 0)
  59       {
  60          FetchResult AltRes;
  61          AltRes.Size = Buf.st_size;
  62          AltRes.Filename = File;
  63          AltRes.LastModified = Buf.st_mtime;
  64          AltRes.IMSHit = false;
  65          if (Itm->LastModified == Buf.st_mtime)
  66             AltRes.IMSHit = true;
  67
  68          URIDone(Res,&AltRes);
  69          return true;
  70       }
  71    }
  72
  73    if (Res.Filename.empty() == true)
  74       return _error->Error("File not found");
  75
  76    URIDone(Res);
  77    return true;
  78 }
  79                                                                         /*}}}*/
  80
  81 int main()
  82 {
  83    FileMethod Mth;
  84    return Mth.Run();
  85 }