apt-pkg/deb/debsystem.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: debsystem.cc,v 1.4 2004/01/26 17:01:53 mdz Exp $
   4 /* ######################################################################
   5
   6    System - Abstraction for running on different systems.
   7
   8    Basic general structure..
   9
  10    ##################################################################### */
  11                                                                         /*}}}*/
  12 // Include Files                                                        /*{{{*/
  13 #include <config.h>
  14
  15 #include <apt-pkg/debsystem.h>
  16 #include <apt-pkg/debversion.h>
  17 #include <apt-pkg/debindexfile.h>
  18 #include <apt-pkg/dpkgpm.h>
  19 #include <apt-pkg/configuration.h>
  20 #include <apt-pkg/error.h>
  21 #include <apt-pkg/fileutl.h>
  22 #include <sys/types.h>
  23 #include <unistd.h>
  24 #include <dirent.h>
  25 #include <errno.h>
  26
  27 #include <apti18n.h>
  28                                                                         /*}}}*/
  29
  30 using std::string;
  31
  32 debSystem debSys;
  33
  34 class debSystemPrivate {
  35 public:
  36    debSystemPrivate() : LockFD(-1), LockCount(0), StatusFile(0)
  37    {
  38    }
  39    // For locking support
  40    int LockFD;
  41    unsigned LockCount;
  42
  43    debStatusIndex *StatusFile;
  44 };
  45
  46 // System::debSystem - Constructor                                      /*{{{*/
  47 // ---------------------------------------------------------------------
  48 /* */
  49 debSystem::debSystem()
  50 {
  51    d = new debSystemPrivate();
  52    Label = "Debian dpkg interface";
  53    VS = &debVS;
  54 }
  55                                                                         /*}}}*/
  56 // System::~debSystem - Destructor                                      /*{{{*/
  57 // ---------------------------------------------------------------------
  58 /* */
  59 debSystem::~debSystem()
  60 {
  61    delete d->StatusFile;
  62    delete d;
  63 }
  64                                                                         /*}}}*/
  65 // System::Lock - Get the lock                                          /*{{{*/
  66 // ---------------------------------------------------------------------
  67 /* This mirrors the operations dpkg does when it starts up. Note the
  68    checking of the updates directory. */
  69 bool debSystem::Lock()
  70 {
  71    // Disable file locking
  72    if (_config->FindB("Debug::NoLocking",false) == true || d->LockCount > 1)
  73    {
  74       d->LockCount++;
  75       return true;
  76    }
  77
  78    // Create the lockfile
  79    string AdminDir = flNotFile(_config->Find("Dir::State::status"));
  80    d->LockFD = GetLock(AdminDir + "lock");
  81    if (d->LockFD == -1)
  82    {
  83       if (errno == EACCES || errno == EAGAIN)
  84          return _error->Error(_("Unable to lock the administration directory (%s), "
  85                                 "is another process using it?"),AdminDir.c_str());
  86       else
  87          return _error->Error(_("Unable to lock the administration directory (%s), "
  88                                 "are you root?"),AdminDir.c_str());
  89    }
  90
  91    // See if we need to abort with a dirty journal
  92    if (CheckUpdates() == true)
  93    {
  94       close(d->LockFD);
  95       d->LockFD = -1;
  96       const char *cmd;
  97       if (getenv("SUDO_USER") != NULL)
  98          cmd = "sudo dpkg --configure -a";
  99       else
 100          cmd = "dpkg --configure -a";
 101       // TRANSLATORS: the %s contains the recovery command, usually
 102       //              dpkg --configure -a
 103       return _error->Error(_("dpkg was interrupted, you must manually "
 104                              "run '%s' to correct the problem. "), cmd);
 105    }
 106
 107          d->LockCount++;
 108
 109    return true;
 110 }
 111                                                                         /*}}}*/
 112 // System::UnLock - Drop a lock                                         /*{{{*/
 113 // ---------------------------------------------------------------------
 114 /* */
 115 bool debSystem::UnLock(bool NoErrors)
 116 {
 117    if (d->LockCount == 0 && NoErrors == true)
 118       return false;
 119
 120    if (d->LockCount < 1)
 121       return _error->Error(_("Not locked"));
 122    if (--d->LockCount == 0)
 123    {
 124       close(d->LockFD);
 125       d->LockCount = 0;
 126    }
 127
 128    return true;
 129 }
 130                                                                         /*}}}*/
 131 // System::CheckUpdates - Check if the updates dir is dirty             /*{{{*/
 132 // ---------------------------------------------------------------------
 133 /* This does a check of the updates directory (dpkg journal) to see if it has
 134    any entries in it. */
 135 bool debSystem::CheckUpdates()
 136 {
 137    // Check for updates.. (dirty)
 138    string File = flNotFile(_config->Find("Dir::State::status")) + "updates/";
 139    DIR *DirP = opendir(File.c_str());
 140    if (DirP == 0)
 141       return false;
 142
 143    /* We ignore any files that are not all digits, this skips .,.. and
 144       some tmp files dpkg will leave behind.. */
 145    bool Damaged = false;
 146    for (struct dirent *Ent = readdir(DirP); Ent != 0; Ent = readdir(DirP))
 147    {
 148       Damaged = true;
 149       for (unsigned int I = 0; Ent->d_name[I] != 0; I++)
 150       {
 151          // Check if its not a digit..
 152          if (isdigit(Ent->d_name[I]) == 0)
 153          {
 154             Damaged = false;
 155             break;
 156          }
 157       }
 158       if (Damaged == true)
 159          break;
 160    }
 161    closedir(DirP);
 162
 163    return Damaged;
 164 }
 165                                                                         /*}}}*/
 166 // System::CreatePM - Create the underlying package manager             /*{{{*/
 167 // ---------------------------------------------------------------------
 168 /* */
 169 pkgPackageManager *debSystem::CreatePM(pkgDepCache *Cache) const
 170 {
 171    return new pkgDPkgPM(Cache);
 172 }
 173                                                                         /*}}}*/
 174 // System::Initialize - Setup the configuration space..                 /*{{{*/
 175 // ---------------------------------------------------------------------
 176 /* These are the Debian specific configuration variables.. */
 177 bool debSystem::Initialize(Configuration &Cnf)
 178 {
 179    /* These really should be jammed into a generic 'Local Database' engine
 180       which is yet to be determined. The functions in pkgcachegen should
 181       be the only users of these */
 182    Cnf.CndSet("Dir::State::extended_states", "extended_states");
 183    Cnf.CndSet("Dir::State::status","/var/lib/dpkg/status");
 184    Cnf.CndSet("Dir::Bin::dpkg","/usr/bin/dpkg");
 185
 186    if (d->StatusFile) {
 187      delete d->StatusFile;
 188      d->StatusFile = 0;
 189    }
 190
 191    return true;
 192 }
 193                                                                         /*}}}*/
 194 // System::ArchiveSupported - Is a file format supported                /*{{{*/
 195 // ---------------------------------------------------------------------
 196 /* The standard name for a deb is 'deb'.. There are no seperate versions
 197    of .deb to worry about.. */
 198 bool debSystem::ArchiveSupported(const char *Type)
 199 {
 200    if (strcmp(Type,"deb") == 0)
 201       return true;
 202    return false;
 203 }
 204                                                                         /*}}}*/
 205 // System::Score - Determine how 'Debiany' this sys is..                /*{{{*/
 206 // ---------------------------------------------------------------------
 207 /* We check some files that are sure tell signs of this being a Debian
 208    System.. */
 209 signed debSystem::Score(Configuration const &Cnf)
 210 {
 211    signed Score = 0;
 212    if (FileExists(Cnf.FindFile("Dir::State::status","/var/lib/dpkg/status")) == true)
 213        Score += 10;
 214    if (FileExists(Cnf.FindFile("Dir::Bin::dpkg","/usr/bin/dpkg")) == true)
 215       Score += 10;
 216    if (FileExists("/etc/debian_version") == true)
 217       Score += 10;
 218    return Score;
 219 }
 220                                                                         /*}}}*/
 221 // System::AddStatusFiles - Register the status files                   /*{{{*/
 222 // ---------------------------------------------------------------------
 223 /* */
 224 bool debSystem::AddStatusFiles(std::vector<pkgIndexFile *> &List)
 225 {
 226    if (d->StatusFile == 0)
 227       d->StatusFile = new debStatusIndex(_config->FindFile("Dir::State::status"));
 228    List.push_back(d->StatusFile);
 229    return true;
 230 }
 231                                                                         /*}}}*/
 232 // System::FindIndex - Get an index file for status files               /*{{{*/
 233 // ---------------------------------------------------------------------
 234 /* */
 235 bool debSystem::FindIndex(pkgCache::PkgFileIterator File,
 236                           pkgIndexFile *&Found) const
 237 {
 238    if (d->StatusFile == 0)
 239       return false;
 240    if (d->StatusFile->FindInCache(*File.Cache()) == File)
 241    {
 242       Found = d->StatusFile;
 243       return true;
 244    }
 245
 246    return false;
 247 }
 248                                                                         /*}}}*/