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