apt-inst/dirstream.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: dirstream.cc,v 1.4 2004/01/07 20:39:37 mdz Exp $
   4 /* ######################################################################
   5
   6    Directory Stream
   7
   8    This class provides a simple basic extractor that can be used for
   9    a number of purposes.
  10
  11    ##################################################################### */
  12                                                                         /*}}}*/
  13 // Include Files                                                        /*{{{*/
  14 #ifdef __GNUG__
  15 #pragma implementation "apt-pkg/dirstream.h"
  16 #endif
  17
  18 #include <apt-pkg/dirstream.h>
  19 #include <apt-pkg/error.h>
  20
  21 #include <fcntl.h>
  22 #include <sys/stat.h>
  23 #include <sys/types.h>
  24 #include <errno.h>
  25 #include <utime.h>
  26 #include <unistd.h>
  27 #include <apti18n.h>
  28                                                                         /*}}}*/
  29
  30 // DirStream::DoItem - Process an item                                  /*{{{*/
  31 // ---------------------------------------------------------------------
  32 /* This is a very simple extractor, it does not deal with things like
  33    overwriting directories with files and so on. */
  34 bool pkgDirStream::DoItem(Item &Itm,int &Fd)
  35 {
  36    switch (Itm.Type)
  37    {
  38       case Item::File:
  39       {
  40          /* Open the output file, NDELAY is used to prevent this from
  41             blowing up on device special files.. */
  42          int iFd = open(Itm.Name,O_NDELAY|O_WRONLY|O_CREAT|O_TRUNC|O_APPEND,
  43                        Itm.Mode);
  44          if (iFd < 0)
  45             return _error->Errno("open",_("Failed write file %s"),
  46                                  Itm.Name);
  47
  48          // fchmod deals with umask and fchown sets the ownership
  49          if (fchmod(iFd,Itm.Mode) != 0)
  50             return _error->Errno("fchmod",_("Failed write file %s"),
  51                                  Itm.Name);
  52          if (fchown(iFd,Itm.UID,Itm.GID) != 0 && errno != EPERM)
  53             return _error->Errno("fchown",_("Failed write file %s"),
  54                                  Itm.Name);
  55          Fd = iFd;
  56          return true;
  57       }
  58
  59       case Item::HardLink:
  60       case Item::SymbolicLink:
  61       case Item::CharDevice:
  62       case Item::BlockDevice:
  63       case Item::Directory:
  64       case Item::FIFO:
  65       break;
  66    }
  67
  68    return true;
  69 }
  70                                                                         /*}}}*/
  71 // DirStream::FinishedFile - Finished processing a file                 /*{{{*/
  72 // ---------------------------------------------------------------------
  73 /* */
  74 bool pkgDirStream::FinishedFile(Item &Itm,int Fd)
  75 {
  76    if (Fd < 0)
  77       return true;
  78
  79    if (close(Fd) != 0)
  80       return _error->Errno("close",_("Failed to close file %s"),Itm.Name);
  81
  82    /* Set the modification times. The only way it can fail is if someone
  83       has futzed with our file, which is intolerable :> */
  84    struct utimbuf Time;
  85    Time.actime = Itm.MTime;
  86    Time.modtime = Itm.MTime;
  87    if (utime(Itm.Name,&Time) != 0)
  88       _error->Errno("utime",_("Failed to close file %s"),Itm.Name);
  89
  90    return true;
  91 }
  92                                                                         /*}}}*/
  93 // DirStream::Fail - Failed processing a file                           /*{{{*/
  94 // ---------------------------------------------------------------------
  95 /* */
  96 bool pkgDirStream::Fail(Item &Itm,int Fd)
  97 {
  98    if (Fd < 0)
  99       return true;
 100
 101    close(Fd);
 102    return false;
 103 }
 104                                                                         /*}}}*/