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 #include<config.h>
  15
  16 #include <apt-pkg/dirstream.h>
  17 #include <apt-pkg/error.h>
  18
  19 #include <fcntl.h>
  20 #include <sys/stat.h>
  21 #include <sys/types.h>
  22 #include <sys/time.h>
  23 #include <errno.h>
  24 #include <unistd.h>
  25 #include <apti18n.h>
  26                                                                         /*}}}*/
  27
  28 // DirStream::DoItem - Process an item                                  /*{{{*/
  29 // ---------------------------------------------------------------------
  30 /* This is a very simple extractor, it does not deal with things like
  31    overwriting directories with files and so on. */
  32 bool pkgDirStream::DoItem(Item &Itm,int &Fd)
  33 {
  34    switch (Itm.Type)
  35    {
  36       case Item::File:
  37       {
  38          /* Open the output file, NDELAY is used to prevent this from
  39             blowing up on device special files.. */
  40          int iFd = open(Itm.Name,O_NDELAY|O_WRONLY|O_CREAT|O_TRUNC|O_APPEND,
  41                        Itm.Mode);
  42          if (iFd < 0)
  43             return _error->Errno("open",_("Failed to write file %s"),
  44                                  Itm.Name);
  45
  46          // fchmod deals with umask and fchown sets the ownership
  47          if (fchmod(iFd,Itm.Mode) != 0)
  48          {
  49             close(iFd);
  50             return _error->Errno("fchmod",_("Failed to write file %s"), Itm.Name);
  51          }
  52          if (fchown(iFd,Itm.UID,Itm.GID) != 0 && errno != EPERM)
  53          {
  54             close(iFd);
  55             return _error->Errno("fchown",_("Failed to write file %s"), Itm.Name);
  56          }
  57          Fd = iFd;
  58          return true;
  59       }
  60
  61       case Item::HardLink:
  62       case Item::SymbolicLink:
  63       case Item::CharDevice:
  64       case Item::BlockDevice:
  65       case Item::Directory:
  66       {
  67          struct stat Buf;
  68          // check if the dir is already there, if so return true
  69          if (stat(Itm.Name,&Buf) == 0)
  70          {
  71             if(S_ISDIR(Buf.st_mode))
  72                return true;
  73             // something else is there already, return false
  74             return false;
  75          }
  76          // nothing here, create the dir
  77          if(mkdir(Itm.Name,Itm.Mode) < 0)
  78             return false;
  79          return true;
  80          break;
  81       }
  82       case Item::FIFO:
  83       break;
  84    }
  85
  86    return true;
  87 }
  88                                                                         /*}}}*/
  89 // DirStream::FinishedFile - Finished processing a file                 /*{{{*/
  90 // ---------------------------------------------------------------------
  91 /* */
  92 bool pkgDirStream::FinishedFile(Item &Itm,int Fd)
  93 {
  94    if (Fd < 0)
  95       return true;
  96
  97    /* Set the modification times. The only way it can fail is if someone
  98       has futzed with our file, which is intolerable :> */
  99    struct timeval times[2];
 100    times[0].tv_sec = times[1].tv_sec = Itm.MTime;
 101    times[0].tv_usec = times[1].tv_usec = 0;
 102    if (utimes(Itm.Name, times) != 0)
 103       _error->Errno("utimes", "Failed to set modification time for %s",Itm.Name);
 104
 105    if (close(Fd) != 0)
 106       return _error->Errno("close",_("Failed to close file %s"),Itm.Name);
 107    return true;
 108 }
 109                                                                         /*}}}*/
 110 // DirStream::Fail - Failed processing a file                           /*{{{*/
 111 // ---------------------------------------------------------------------
 112 /* */
 113 bool pkgDirStream::Fail(Item &Itm,int Fd)
 114 {
 115    if (Fd < 0)
 116       return true;
 117
 118    close(Fd);
 119    return false;
 120 }
 121                                                                         /*}}}*/