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/aptconfiguration.h>
  20 #include <apt-pkg/error.h>
  21 #include <apt-pkg/hashes.h>
  22 #include <apt-pkg/fileutl.h>
  23 #include <apt-pkg/strutl.h>
  24
  25 #include <string>
  26 #include <sys/stat.h>
  27
  28 #include <apti18n.h>
  29                                                                         /*}}}*/
  30
  31 class FileMethod : public pkgAcqMethod
  32 {
  33    virtual bool Fetch(FetchItem *Itm);
  34
  35    public:
  36
  37    FileMethod() : pkgAcqMethod("1.0",SingleInstance | SendConfig | LocalOnly) {};
  38 };
  39
  40 // FileMethod::Fetch - Fetch a file                                     /*{{{*/
  41 // ---------------------------------------------------------------------
  42 /* */
  43 bool FileMethod::Fetch(FetchItem *Itm)
  44 {
  45    URI Get = Itm->Uri;
  46    std::string File = Get.Path;
  47    FetchResult Res;
  48    if (Get.Host.empty() == false)
  49       return _error->Error(_("Invalid URI, local URIS must not start with //"));
  50
  51    struct stat Buf;
  52    // deal with destination files which might linger around
  53    if (lstat(Itm->DestFile.c_str(), &Buf) == 0)
  54    {
  55       if ((Buf.st_mode & S_IFREG) != 0)
  56       {
  57          if (Itm->LastModified == Buf.st_mtime && Itm->LastModified != 0)
  58          {
  59             HashStringList const hsl = Itm->ExpectedHashes;
  60             if (Itm->ExpectedHashes.VerifyFile(File))
  61                Res.IMSHit = true;
  62          }
  63       }
  64    }
  65    if (Res.IMSHit != true)
  66       unlink(Itm->DestFile.c_str());
  67
  68    // See if the file exists
  69    if (stat(File.c_str(),&Buf) == 0)
  70    {
  71       Res.Size = Buf.st_size;
  72       Res.Filename = File;
  73       Res.LastModified = Buf.st_mtime;
  74       Res.IMSHit = false;
  75       if (Itm->LastModified == Buf.st_mtime && Itm->LastModified != 0)
  76       {
  77          unsigned long long const filesize = Itm->ExpectedHashes.FileSize();
  78          if (filesize != 0 && filesize == Res.Size)
  79             Res.IMSHit = true;
  80       }
  81    }
  82
  83    // See if the uncompressed file exists and reuse it
  84    FetchResult AltRes;
  85    AltRes.Filename.clear();
  86    std::vector<std::string> extensions = APT::Configuration::getCompressorExtensions();
  87    for (std::vector<std::string>::const_iterator ext = extensions.begin(); ext != extensions.end(); ++ext)
  88    {
  89       if (APT::String::Endswith(File, *ext) == true)
  90       {
  91          std::string const unfile = File.substr(0, File.length() - ext->length() - 1);
  92          if (stat(unfile.c_str(),&Buf) == 0)
  93          {
  94             AltRes.Size = Buf.st_size;
  95             AltRes.Filename = unfile;
  96             AltRes.LastModified = Buf.st_mtime;
  97             AltRes.IMSHit = false;
  98             if (Itm->LastModified == Buf.st_mtime && Itm->LastModified != 0)
  99                AltRes.IMSHit = true;
 100             break;
 101          }
 102          // no break here as we could have situations similar to '.gz' vs '.tar.gz' here
 103       }
 104    }
 105
 106    if (Res.Filename.empty() == false)
 107    {
 108       Hashes Hash(Itm->ExpectedHashes);
 109       FileFd Fd(Res.Filename, FileFd::ReadOnly);
 110       Hash.AddFD(Fd);
 111       Res.TakeHashes(Hash);
 112    }
 113
 114    if (AltRes.Filename.empty() == false)
 115       URIDone(Res,&AltRes);
 116    else if (Res.Filename.empty() == false)
 117       URIDone(Res);
 118    else
 119       return _error->Error(_("File not found"));
 120
 121    return true;
 122 }
 123                                                                         /*}}}*/
 124
 125 int main()
 126 {
 127    setlocale(LC_ALL, "");
 128
 129    FileMethod Mth;
 130    return Mth.Run();
 131 }