methods/store.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 /* ######################################################################
   4
   5    Store method - Takes a file URI and stores its content (for which it will
   6    calculate the hashes) in the given destination. The input file will be
   7    extracted based on its file extension (or with the given compressor if
   8    called with one of the compatible symlinks) and potentially recompressed
   9    based on the file extension of the destination filename.
  10
  11    ##################################################################### */
  12                                                                         /*}}}*/
  13 // Include Files                                                        /*{{{*/
  14 #include <config.h>
  15
  16 #include <apt-pkg/configuration.h>
  17 #include <apt-pkg/acquire-method.h>
  18 #include <apt-pkg/error.h>
  19 #include <apt-pkg/fileutl.h>
  20 #include <apt-pkg/hashes.h>
  21 #include <apt-pkg/strutl.h>
  22 #include <apt-pkg/aptconfiguration.h>
  23 #include "aptmethod.h"
  24
  25 #include <string.h>
  26 #include <sys/stat.h>
  27 #include <sys/time.h>
  28 #include <string>
  29 #include <vector>
  30
  31 #include <apti18n.h>
  32                                                                         /*}}}*/
  33
  34 class StoreMethod : public aptMethod
  35 {
  36    std::string const Prog;
  37    virtual bool Fetch(FetchItem *Itm) APT_OVERRIDE;
  38
  39    public:
  40
  41    explicit StoreMethod(std::string const &pProg) : aptMethod(pProg.c_str(),"1.2",SingleInstance | SendConfig), Prog(pProg) {};
  42 };
  43
  44 static bool OpenFileWithCompressorByName(FileFd &fileFd, std::string const &Filename, unsigned int const Mode, std::string const &Name)
  45 {
  46    if (Name == "store")
  47       return fileFd.Open(Filename, Mode, FileFd::Extension);
  48
  49    std::vector<APT::Configuration::Compressor> const compressors = APT::Configuration::getCompressors();
  50    std::vector<APT::Configuration::Compressor>::const_iterator compressor = compressors.begin();
  51    for (; compressor != compressors.end(); ++compressor)
  52       if (compressor->Name == Name)
  53          break;
  54    if (compressor == compressors.end())
  55       return _error->Error("Extraction of file %s requires unknown compressor %s", Filename.c_str(), Name.c_str());
  56    return fileFd.Open(Filename, Mode, *compressor);
  57 }
  58
  59
  60                                                                         /*}}}*/
  61 bool StoreMethod::Fetch(FetchItem *Itm)                                 /*{{{*/
  62 {
  63    URI Get = Itm->Uri;
  64    std::string Path = Get.Host + Get.Path; // To account for relative paths
  65
  66    FetchResult Res;
  67    Res.Filename = Itm->DestFile;
  68    URIStart(Res);
  69
  70    // Open the source and destination files
  71    FileFd From;
  72    if (_config->FindB("Method::Compress", false) == false)
  73    {
  74       if (OpenFileWithCompressorByName(From, Path, FileFd::ReadOnly, Prog) == false)
  75          return false;
  76       if(From.IsCompressed() && From.FileSize() == 0)
  77          return _error->Error(_("Empty files can't be valid archives"));
  78    }
  79    else
  80       From.Open(Path, FileFd::ReadOnly, FileFd::Extension);
  81    if (From.IsOpen() == false || From.Failed() == true)
  82       return false;
  83
  84    FileFd To;
  85    if (Itm->DestFile != "/dev/null" && Itm->DestFile != Path)
  86    {
  87       if (_config->FindB("Method::Compress", false) == false)
  88          To.Open(Itm->DestFile, FileFd::WriteOnly | FileFd::Create | FileFd::Atomic, FileFd::Extension);
  89       else if (OpenFileWithCompressorByName(To, Itm->DestFile, FileFd::WriteOnly | FileFd::Create | FileFd::Empty, Prog) == false)
  90             return false;
  91
  92       if (To.IsOpen() == false || To.Failed() == true)
  93          return false;
  94       To.EraseOnFailure();
  95    }
  96
  97    // Read data from source, generate checksums and write
  98    Hashes Hash(Itm->ExpectedHashes);
  99    bool Failed = false;
 100    Res.Size = 0;
 101    while (1)
 102    {
 103       unsigned char Buffer[4*1024];
 104       unsigned long long Count = 0;
 105
 106       if (!From.Read(Buffer,sizeof(Buffer),&Count))
 107       {
 108          if (To.IsOpen())
 109             To.OpFail();
 110          return false;
 111       }
 112       if (Count == 0)
 113          break;
 114       Res.Size += Count;
 115
 116       Hash.Add(Buffer,Count);
 117       if (To.IsOpen() && To.Write(Buffer,Count) == false)
 118       {
 119          Failed = true;
 120          break;
 121       }
 122    }
 123
 124    From.Close();
 125    To.Close();
 126
 127    if (Failed == true)
 128       return false;
 129
 130    // Transfer the modification times
 131    if (Itm->DestFile != "/dev/null")
 132    {
 133       struct stat Buf;
 134       if (stat(Path.c_str(),&Buf) != 0)
 135          return _error->Errno("stat",_("Failed to stat"));
 136
 137       struct timeval times[2];
 138       times[0].tv_sec = Buf.st_atime;
 139       Res.LastModified = times[1].tv_sec = Buf.st_mtime;
 140       times[0].tv_usec = times[1].tv_usec = 0;
 141       if (utimes(Itm->DestFile.c_str(), times) != 0)
 142          return _error->Errno("utimes",_("Failed to set modification time"));
 143    }
 144
 145    // Return a Done response
 146    Res.TakeHashes(Hash);
 147
 148    URIDone(Res);
 149    return true;
 150 }
 151                                                                         /*}}}*/
 152
 153 int main(int, char *argv[])
 154 {
 155    setlocale(LC_ALL, "");
 156
 157    StoreMethod Mth(flNotDir(argv[0]));
 158    return Mth.Run();
 159 }