apt-inst/dirstream.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: dirstream.cc,v 1.3.2.1 2004/01/16 18:58:50 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 to 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 to write file %s"),
  51                                  Itm.Name);
  52          if (fchown(iFd,Itm.UID,Itm.GID) != 0 && errno != EPERM)
  53             return _error->Errno("fchown",_("Failed to 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       {
  65          struct stat Buf;
  66          // check if the dir is already there, if so return true
  67          if (stat(Itm.Name,&Buf) == 0)
  68          {
  69             if(S_ISDIR(Buf.st_mode))
  70                return true;
  71             // something else is there already, return false
  72             return false;
  73          }
  74          // nothing here, create the dir
  75          if(mkdir(Itm.Name,Itm.Mode) < 0)
  76             return false;
  77          return true;
  78          break;
  79       }
  80       case Item::FIFO:
  81       break;
  82    }
  83
  84    return true;
  85 }
  86                                                                         /*}}}*/
  87 // DirStream::FinishedFile - Finished processing a file                 /*{{{*/
  88 // ---------------------------------------------------------------------
  89 /* */
  90 bool pkgDirStream::FinishedFile(Item &Itm,int Fd)
  91 {
  92    if (Fd < 0)
  93       return true;
  94
  95    if (close(Fd) != 0)
  96       return _error->Errno("close",_("Failed to close file %s"),Itm.Name);
  97
  98    /* Set the modification times. The only way it can fail is if someone
  99       has futzed with our file, which is intolerable :> */
 100    struct utimbuf Time;
 101    Time.actime = Itm.MTime;
 102    Time.modtime = Itm.MTime;
 103    if (utime(Itm.Name,&Time) != 0)
 104       _error->Errno("utime",_("Failed to close file %s"),Itm.Name);
 105
 106    return true;
 107 }
 108                                                                         /*}}}*/
 109 // DirStream::Fail - Failed processing a file                           /*{{{*/
 110 // ---------------------------------------------------------------------
 111 /* */
 112 bool pkgDirStream::Fail(Item &Itm,int Fd)
 113 {
 114    if (Fd < 0)
 115       return true;
 116
 117    close(Fd);
 118    return false;
 119 }
 120                                                                         /*}}}*/