methods/gzip.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: gzip.cc,v 1.9 1999/12/10 23:40:29 jgg Exp $
   4 /* ######################################################################
   5
   6    GZip method - Take a file URI in and decompress it into the target
   7    file.
   8
   9    ##################################################################### */
  10                                                                         /*}}}*/
  11 // Include Files                                                        /*{{{*/
  12 #include <apt-pkg/fileutl.h>
  13 #include <apt-pkg/error.h>
  14 #include <apt-pkg/acquire-method.h>
  15 #include <apt-pkg/strutl.h>
  16
  17 #include <sys/stat.h>
  18 #include <unistd.h>
  19 #include <utime.h>
  20 #include <stdio.h>
  21                                                                         /*}}}*/
  22
  23 class GzipMethod : public pkgAcqMethod
  24 {
  25    virtual bool Fetch(FetchItem *Itm);
  26
  27    public:
  28
  29    GzipMethod() : pkgAcqMethod("1.0",SingleInstance | SendConfig) {};
  30 };
  31
  32 // GzipMethod::Fetch - Decompress the passed URI                        /*{{{*/
  33 // ---------------------------------------------------------------------
  34 /* */
  35 bool GzipMethod::Fetch(FetchItem *Itm)
  36 {
  37    URI Get = Itm->Uri;
  38
  39    FetchResult Res;
  40    Res.Filename = Itm->DestFile;
  41    URIStart(Res);
  42
  43    // Open the source and destintation files
  44    FileFd From(Get.Path,FileFd::ReadOnly);
  45    FileFd To(Itm->DestFile,FileFd::WriteEmpty);
  46    To.EraseOnFailure();
  47    if (_error->PendingError() == true)
  48       return false;
  49
  50    // Fork gzip
  51    int Process = fork();
  52    if (Process < 0)
  53       return _error->Errno("fork","Couldn't fork gzip");
  54
  55    // The child
  56    if (Process == 0)
  57    {
  58       dup2(From.Fd(),STDIN_FILENO);
  59       dup2(To.Fd(),STDOUT_FILENO);
  60       From.Close();
  61       To.Close();
  62       SetCloseExec(STDIN_FILENO,false);
  63       SetCloseExec(STDOUT_FILENO,false);
  64
  65       const char *Args[3];
  66       Args[0] = _config->Find("Dir::bin::gzip","gzip").c_str();
  67       Args[1] = "-d";
  68       Args[2] = 0;
  69       execvp(Args[0],(char **)Args);
  70       exit(100);
  71    }
  72    From.Close();
  73
  74    // Wait for gzip to finish
  75    if (ExecWait(Process,_config->Find("Dir::bin::gzip","gzip").c_str(),false) == false)
  76    {
  77       To.OpFail();
  78       return false;
  79    }
  80
  81    To.Close();
  82
  83    // Transfer the modification times
  84    struct stat Buf;
  85    if (stat(Get.Path.c_str(),&Buf) != 0)
  86       return _error->Errno("stat","Failed to stat");
  87
  88    struct utimbuf TimeBuf;
  89    TimeBuf.actime = Buf.st_atime;
  90    TimeBuf.modtime = Buf.st_mtime;
  91    if (utime(Itm->DestFile.c_str(),&TimeBuf) != 0)
  92       return _error->Errno("utime","Failed to set modification time");
  93
  94    if (stat(Itm->DestFile.c_str(),&Buf) != 0)
  95       return _error->Errno("stat","Failed to stat");
  96
  97    // Return a Done response
  98    Res.LastModified = Buf.st_mtime;
  99    Res.Size = Buf.st_size;
 100    URIDone(Res);
 101
 102    return true;
 103 }
 104                                                                         /*}}}*/
 105
 106 int main()
 107 {
 108    GzipMethod Mth;
 109    return Mth.Run();
 110 }