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 #include "aptmethod.h"
  25
  26 #include <string>
  27 #include <sys/stat.h>
  28
  29 #include <apti18n.h>
  30                                                                         /*}}}*/
  31
  32 class FileMethod : public aptMethod
  33 {
  34    virtual bool Fetch(FetchItem *Itm) APT_OVERRIDE;
  35
  36    public:
  37    FileMethod() : aptMethod("file", "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             {
  62                Res.Filename = Itm->DestFile;
  63                Res.IMSHit = true;
  64             }
  65          }
  66       }
  67    }
  68    if (Res.IMSHit != true)
  69       RemoveFile("file", Itm->DestFile);
  70
  71    int olderrno = 0;
  72    // See if the file exists
  73    if (stat(File.c_str(),&Buf) == 0)
  74    {
  75       Res.Size = Buf.st_size;
  76       Res.Filename = File;
  77       Res.LastModified = Buf.st_mtime;
  78       Res.IMSHit = false;
  79       if (Itm->LastModified == Buf.st_mtime && Itm->LastModified != 0)
  80       {
  81          unsigned long long const filesize = Itm->ExpectedHashes.FileSize();
  82          if (filesize != 0 && filesize == Res.Size)
  83             Res.IMSHit = true;
  84       }
  85
  86       CalculateHashes(Itm, Res);
  87    }
  88    else
  89       olderrno = errno;
  90    if (Res.IMSHit == false)
  91       URIStart(Res);
  92
  93    // See if the uncompressed file exists and reuse it
  94    FetchResult AltRes;
  95    AltRes.Filename.clear();
  96    std::vector<std::string> extensions = APT::Configuration::getCompressorExtensions();
  97    for (std::vector<std::string>::const_iterator ext = extensions.begin(); ext != extensions.end(); ++ext)
  98    {
  99       if (APT::String::Endswith(File, *ext) == true)
 100       {
 101          std::string const unfile = File.substr(0, File.length() - ext->length());
 102          if (stat(unfile.c_str(),&Buf) == 0)
 103          {
 104             AltRes.Size = Buf.st_size;
 105             AltRes.Filename = unfile;
 106             AltRes.LastModified = Buf.st_mtime;
 107             AltRes.IMSHit = false;
 108             if (Itm->LastModified == Buf.st_mtime && Itm->LastModified != 0)
 109                AltRes.IMSHit = true;
 110             break;
 111          }
 112          // no break here as we could have situations similar to '.gz' vs '.tar.gz' here
 113       }
 114    }
 115
 116    if (AltRes.Filename.empty() == false)
 117       URIDone(Res,&AltRes);
 118    else if (Res.Filename.empty() == false)
 119       URIDone(Res);
 120    else
 121    {
 122       errno = olderrno;
 123       return _error->Errno(File.c_str(), _("File not found"));
 124    }
 125
 126    return true;
 127 }
 128                                                                         /*}}}*/
 129
 130 int main()
 131 {
 132    setlocale(LC_ALL, "");
 133
 134    FileMethod Mth;
 135    return Mth.Run();
 136 }