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 <apt-pkg/pkgcache.h>
  23 #include <apt-pkg/cacheiterators.h>
  24
  25 #include <ctype.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <string>
  29 #include <vector>
  30 #include <unistd.h>
  31 #include <dirent.h>
  32 #include <errno.h>
  33
  34 #include <apti18n.h>
  35                                                                         /*}}}*/
  36
  37 using std::string;
  38
  39 debSystem debSys;
  40
  41 class debSystemPrivate {
  42 public:
  43    debSystemPrivate() : LockFD(-1), LockCount(0), StatusFile(0)
  44    {
  45    }
  46    // For locking support
  47    int LockFD;
  48    unsigned LockCount;
  49
  50    debStatusIndex *StatusFile;
  51 };
  52
  53 // System::debSystem - Constructor                                      /*{{{*/
  54 // ---------------------------------------------------------------------
  55 /* */
  56 debSystem::debSystem()
  57 {
  58    d = new debSystemPrivate();
  59    Label = "Debian dpkg interface";
  60    VS = &debVS;
  61 }
  62                                                                         /*}}}*/
  63 // System::~debSystem - Destructor                                      /*{{{*/
  64 // ---------------------------------------------------------------------
  65 /* */
  66 debSystem::~debSystem()
  67 {
  68    delete d->StatusFile;
  69    delete d;
  70 }
  71                                                                         /*}}}*/
  72 // System::Lock - Get the lock                                          /*{{{*/
  73 // ---------------------------------------------------------------------
  74 /* This mirrors the operations dpkg does when it starts up. Note the
  75    checking of the updates directory. */
  76 bool debSystem::Lock()
  77 {
  78    // Disable file locking
  79    if (_config->FindB("Debug::NoLocking",false) == true || d->LockCount > 1)
  80    {
  81       d->LockCount++;
  82       return true;
  83    }
  84
  85    // Create the lockfile
  86    string AdminDir = flNotFile(_config->Find("Dir::State::status"));
  87    d->LockFD = GetLock(AdminDir + "lock");
  88    if (d->LockFD == -1)
  89    {
  90       if (errno == EACCES || errno == EAGAIN)
  91          return _error->Error(_("Unable to lock the administration directory (%s), "
  92                                 "is another process using it?"),AdminDir.c_str());
  93       else
  94          return _error->Error(_("Unable to lock the administration directory (%s), "
  95                                 "are you root?"),AdminDir.c_str());
  96    }
  97
  98    // See if we need to abort with a dirty journal
  99    if (CheckUpdates() == true)
 100    {
 101       close(d->LockFD);
 102       d->LockFD = -1;
 103       const char *cmd;
 104       if (getenv("SUDO_USER") != NULL)
 105          cmd = "sudo dpkg --configure -a";
 106       else
 107          cmd = "dpkg --configure -a";
 108       // TRANSLATORS: the %s contains the recovery command, usually
 109       //              dpkg --configure -a
 110       return _error->Error(_("dpkg was interrupted, you must manually "
 111                              "run '%s' to correct the problem. "), cmd);
 112    }
 113
 114          d->LockCount++;
 115
 116    return true;
 117 }
 118                                                                         /*}}}*/
 119 // System::UnLock - Drop a lock                                         /*{{{*/
 120 // ---------------------------------------------------------------------
 121 /* */
 122 bool debSystem::UnLock(bool NoErrors)
 123 {
 124    if (d->LockCount == 0 && NoErrors == true)
 125       return false;
 126
 127    if (d->LockCount < 1)
 128       return _error->Error(_("Not locked"));
 129    if (--d->LockCount == 0)
 130    {
 131       close(d->LockFD);
 132       d->LockCount = 0;
 133    }
 134
 135    return true;
 136 }
 137                                                                         /*}}}*/
 138 // System::CheckUpdates - Check if the updates dir is dirty             /*{{{*/
 139 // ---------------------------------------------------------------------
 140 /* This does a check of the updates directory (dpkg journal) to see if it has
 141    any entries in it. */
 142 bool debSystem::CheckUpdates()
 143 {
 144    // Check for updates.. (dirty)
 145    string File = flNotFile(_config->Find("Dir::State::status")) + "updates/";
 146    DIR *DirP = opendir(File.c_str());
 147    if (DirP == 0)
 148       return false;
 149
 150    /* We ignore any files that are not all digits, this skips .,.. and
 151       some tmp files dpkg will leave behind.. */
 152    bool Damaged = false;
 153    for (struct dirent *Ent = readdir(DirP); Ent != 0; Ent = readdir(DirP))
 154    {
 155       Damaged = true;
 156       for (unsigned int I = 0; Ent->d_name[I] != 0; I++)
 157       {
 158          // Check if its not a digit..
 159          if (isdigit(Ent->d_name[I]) == 0)
 160          {
 161             Damaged = false;
 162             break;
 163          }
 164       }
 165       if (Damaged == true)
 166          break;
 167    }
 168    closedir(DirP);
 169
 170    return Damaged;
 171 }
 172                                                                         /*}}}*/
 173 // System::CreatePM - Create the underlying package manager             /*{{{*/
 174 // ---------------------------------------------------------------------
 175 /* */
 176 pkgPackageManager *debSystem::CreatePM(pkgDepCache *Cache) const
 177 {
 178    return new pkgDPkgPM(Cache);
 179 }
 180                                                                         /*}}}*/
 181 // System::Initialize - Setup the configuration space..                 /*{{{*/
 182 // ---------------------------------------------------------------------
 183 /* These are the Debian specific configuration variables.. */
 184 bool debSystem::Initialize(Configuration &Cnf)
 185 {
 186    /* These really should be jammed into a generic 'Local Database' engine
 187       which is yet to be determined. The functions in pkgcachegen should
 188       be the only users of these */
 189    Cnf.CndSet("Dir::State::extended_states", "extended_states");
 190    Cnf.CndSet("Dir::State::status","/var/lib/dpkg/status");
 191    Cnf.CndSet("Dir::Bin::dpkg","/usr/bin/dpkg");
 192
 193    if (d->StatusFile) {
 194      delete d->StatusFile;
 195      d->StatusFile = 0;
 196    }
 197
 198    return true;
 199 }
 200                                                                         /*}}}*/
 201 // System::ArchiveSupported - Is a file format supported                /*{{{*/
 202 // ---------------------------------------------------------------------
 203 /* The standard name for a deb is 'deb'.. There are no separate versions
 204    of .deb to worry about.. */
 205 APT_PURE bool debSystem::ArchiveSupported(const char *Type)
 206 {
 207    if (strcmp(Type,"deb") == 0)
 208       return true;
 209    return false;
 210 }
 211                                                                         /*}}}*/
 212 // System::Score - Determine how 'Debiany' this sys is..                /*{{{*/
 213 // ---------------------------------------------------------------------
 214 /* We check some files that are sure tell signs of this being a Debian
 215    System.. */
 216 signed debSystem::Score(Configuration const &Cnf)
 217 {
 218    signed Score = 0;
 219    if (FileExists(Cnf.FindFile("Dir::State::status","/var/lib/dpkg/status")) == true)
 220        Score += 10;
 221    if (FileExists(Cnf.FindFile("Dir::Bin::dpkg","/usr/bin/dpkg")) == true)
 222       Score += 10;
 223    if (FileExists("/etc/debian_version") == true)
 224       Score += 10;
 225    return Score;
 226 }
 227                                                                         /*}}}*/
 228 // System::AddStatusFiles - Register the status files                   /*{{{*/
 229 // ---------------------------------------------------------------------
 230 /* */
 231 bool debSystem::AddStatusFiles(std::vector<pkgIndexFile *> &List)
 232 {
 233    if (d->StatusFile == 0)
 234       d->StatusFile = new debStatusIndex(_config->FindFile("Dir::State::status"));
 235    List.push_back(d->StatusFile);
 236    return true;
 237 }
 238                                                                         /*}}}*/
 239 // System::FindIndex - Get an index file for status files               /*{{{*/
 240 // ---------------------------------------------------------------------
 241 /* */
 242 bool debSystem::FindIndex(pkgCache::PkgFileIterator File,
 243                           pkgIndexFile *&Found) const
 244 {
 245    if (d->StatusFile == 0)
 246       return false;
 247    if (d->StatusFile->FindInCache(*File.Cache()) == File)
 248    {
 249       Found = d->StatusFile;
 250       return true;
 251    }
 252
 253    return false;
 254 }
 255                                                                         /*}}}*/