apt-pkg/deb/dpkginit.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: dpkginit.cc,v 1.1 1998/11/23 07:03:10 jgg Exp $
   4 /* ######################################################################
   5
   6    DPKG init - Initialize the dpkg stuff
   7
   8    ##################################################################### */
   9                                                                         /*}}}*/
  10 // Includes                                                             /*{{{*/
  11 #ifdef __GNUG__
  12 #pragma implementation "apt-pkg/dpkginit.h"
  13 #endif
  14 #include <apt-pkg/dpkginit.h>
  15 #include <apt-pkg/error.h>
  16 #include <apt-pkg/configuration.h>
  17 #include <apt-pkg/fileutl.h>
  18
  19 #include <sys/types.h>
  20 #include <unistd.h>
  21 #include <dirent.h>
  22                                                                         /*}}}*/
  23
  24 // DpkgLock::pkgDpkgLock - Constructor                                  /*{{{*/
  25 // ---------------------------------------------------------------------
  26 /* */
  27 pkgDpkgLock::pkgDpkgLock()
  28 {
  29    LockFD = -1;
  30    GetLock();
  31 }
  32                                                                         /*}}}*/
  33 // DpkgLock::~pkgDpkgLock - Destructor                                  /*{{{*/
  34 // ---------------------------------------------------------------------
  35 /* */
  36 pkgDpkgLock::~pkgDpkgLock()
  37 {
  38    Close();
  39 }
  40                                                                         /*}}}*/
  41 // DpkgLock::GetLock - Get the lock                                     /*{{{*/
  42 // ---------------------------------------------------------------------
  43 /* This mirrors the operations dpkg does when it starts up. Note the
  44    checking of the updates directory. */
  45 bool pkgDpkgLock::GetLock()
  46 {
  47    // Disable file locking
  48    if (_config->FindB("Debug::NoLocking",false) == true)
  49       return true;
  50
  51    Close();
  52
  53    // Create the lockfile
  54    string AdminDir = flNotFile(_config->Find("Dir::State::status"));
  55    LockFD = ::GetLock(AdminDir + "lock");
  56    if (LockFD == -1)
  57       return _error->Errno("Open","Unable to lock the administration directory "
  58                            "%s, are you root?",AdminDir.c_str());
  59
  60    // Check for updates.. (dirty)
  61    string File = AdminDir + "updates/";
  62    DIR *DirP = opendir(File.c_str());
  63    if (DirP != 0)
  64    {
  65       /* We ignore any files that are not all digits, this skips .,.. and
  66          some tmp files dpkg will leave behind.. */
  67       bool Damaged = false;
  68       for (struct dirent *Ent = readdir(DirP); Ent != 0; Ent = readdir(DirP))
  69       {
  70          Damaged = true;
  71          for (unsigned int I = 0; Ent->d_name[I] != 0; I++)
  72          {
  73             // Check if its not a digit..
  74             if (isdigit(Ent->d_name[I]) == 0)
  75             {
  76                Damaged = false;
  77                break;
  78             }
  79          }
  80          if (Damaged == true)
  81             break;
  82       }
  83       closedir(DirP);
  84
  85       // Woops, we have to run dpkg to rewrite the status file
  86       if (Damaged == true)
  87       {
  88          Close();
  89          return _error->Error("dpkg was interrupted, you must manually "
  90                               "run 'dpkg --configure -a' to correct the problem. ");
  91       }
  92    }
  93
  94    return true;
  95 }
  96                                                                         /*}}}*/
  97 // DpkgLock::Close - Close the lock                                     /*{{{*/
  98 // ---------------------------------------------------------------------
  99 /* */
 100 void pkgDpkgLock::Close()
 101 {
 102    close(LockFD);
 103    LockFD = -1;
 104 }
 105                                                                         /*}}}*/