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