methods/copy.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: copy.cc,v 1.7.2.1 2004/01/16 18:58:50 mdz Exp $
   4 /* ######################################################################
   5
   6    Copy URI - This method takes a uri like a file: uri and copies it
   7    to the destination file.
   8
   9    ##################################################################### */
  10                                                                         /*}}}*/
  11 // Include Files                                                        /*{{{*/
  12 #include <config.h>
  13
  14 #include <apt-pkg/fileutl.h>
  15 #include <apt-pkg/strutl.h>
  16 #include <apt-pkg/acquire-method.h>
  17 #include <apt-pkg/error.h>
  18 #include <apt-pkg/hashes.h>
  19 #include <apt-pkg/configuration.h>
  20
  21 #include <string>
  22 #include <sys/stat.h>
  23 #include <sys/time.h>
  24
  25 #include <apti18n.h>
  26                                                                         /*}}}*/
  27
  28 class CopyMethod : public pkgAcqMethod
  29 {
  30    virtual bool Fetch(FetchItem *Itm) APT_OVERRIDE;
  31    void CalculateHashes(FetchItem const * const Itm, FetchResult &Res);
  32
  33    public:
  34
  35    CopyMethod() : pkgAcqMethod("1.0",SingleInstance | SendConfig) {};
  36 };
  37
  38 void CopyMethod::CalculateHashes(FetchItem const * const Itm, FetchResult &Res)
  39 {
  40    Hashes Hash(Itm->ExpectedHashes);
  41    FileFd Fd(Res.Filename, FileFd::ReadOnly, FileFd::Extension);
  42    Hash.AddFD(Fd);
  43    Res.TakeHashes(Hash);
  44 }
  45
  46 // CopyMethod::Fetch - Fetch a file                                     /*{{{*/
  47 // ---------------------------------------------------------------------
  48 /* */
  49 bool CopyMethod::Fetch(FetchItem *Itm)
  50 {
  51    // this ensures that relative paths work in copy
  52    std::string const File = Itm->Uri.substr(Itm->Uri.find(':')+1);
  53
  54    // Stat the file and send a start message
  55    struct stat Buf;
  56    if (stat(File.c_str(),&Buf) != 0)
  57       return _error->Errno("stat",_("Failed to stat"));
  58
  59    // Forumulate a result and send a start message
  60    FetchResult Res;
  61    Res.Size = Buf.st_size;
  62    Res.Filename = Itm->DestFile;
  63    Res.LastModified = Buf.st_mtime;
  64    Res.IMSHit = false;
  65    URIStart(Res);
  66
  67    // just calc the hashes if the source and destination are identical
  68    if (File == Itm->DestFile)
  69    {
  70       CalculateHashes(Itm, Res);
  71       URIDone(Res);
  72       return true;
  73    }
  74
  75    // See if the file exists
  76    FileFd From(File,FileFd::ReadOnly);
  77    FileFd To(Itm->DestFile,FileFd::WriteAtomic);
  78    To.EraseOnFailure();
  79    if (_error->PendingError() == true)
  80    {
  81       To.OpFail();
  82       return false;
  83    }
  84
  85    // Copy the file
  86    if (CopyFile(From,To) == false)
  87    {
  88       To.OpFail();
  89       return false;
  90    }
  91
  92    From.Close();
  93    To.Close();
  94
  95    // Transfer the modification times
  96    struct timeval times[2];
  97    times[0].tv_sec = Buf.st_atime;
  98    times[1].tv_sec = Buf.st_mtime;
  99    times[0].tv_usec = times[1].tv_usec = 0;
 100    if (utimes(Res.Filename.c_str(), times) != 0)
 101       return _error->Errno("utimes",_("Failed to set modification time"));
 102
 103    CalculateHashes(Itm, Res);
 104
 105    URIDone(Res);
 106    return true;
 107 }
 108                                                                         /*}}}*/
 109
 110 int main()
 111 {
 112    setlocale(LC_ALL, "");
 113
 114    CopyMethod Mth;
 115
 116    return Mth.Run();
 117 }