apt-private/private-output.cc

   1 // Include files                                                        /*{{{*/
   2 #include<config.h>
   3
   4 #include <apt-pkg/configuration.h>
   5 #include <apt-pkg/strutl.h>
   6 #include <apt-pkg/error.h>
   7 #include <apt-pkg/cachefile.h>
   8 #include <apt-pkg/pkgrecords.h>
   9 #include <apt-pkg/policy.h>
  10 #include <apt-pkg/depcache.h>
  11 #include <apt-pkg/pkgcache.h>
  12 #include <apt-pkg/cacheiterators.h>
  13
  14 #include <apt-private/private-output.h>
  15 #include <apt-private/private-cachefile.h>
  16
  17 #include <regex.h>
  18 #include <stdio.h>
  19 #include <stdlib.h>
  20 #include <string.h>
  21 #include <iomanip>
  22 #include <iostream>
  23 #include <langinfo.h>
  24 #include <unistd.h>
  25 #include <signal.h>
  26 #include <sys/ioctl.h>
  27
  28 #include <apti18n.h>
  29                                                                         /*}}}*/
  30
  31 using namespace std;
  32
  33 std::ostream c0out(0);
  34 std::ostream c1out(0);
  35 std::ostream c2out(0);
  36 std::ofstream devnull("/dev/null");
  37
  38
  39 unsigned int ScreenWidth = 80 - 1; /* - 1 for the cursor */
  40
  41 // SigWinch - Window size change signal handler                         /*{{{*/
  42 // ---------------------------------------------------------------------
  43 /* */
  44 static void SigWinch(int)
  45 {
  46    // Riped from GNU ls
  47 #ifdef TIOCGWINSZ
  48    struct winsize ws;
  49
  50    if (ioctl(1, TIOCGWINSZ, &ws) != -1 && ws.ws_col >= 5)
  51       ScreenWidth = ws.ws_col - 1;
  52 #endif
  53 }
  54                                                                         /*}}}*/
  55 bool InitOutput()                                                       /*{{{*/
  56 {
  57    if (!isatty(STDOUT_FILENO) && _config->FindI("quiet", -1) == -1)
  58       _config->Set("quiet","1");
  59
  60    c0out.rdbuf(cout.rdbuf());
  61    c1out.rdbuf(cout.rdbuf());
  62    c2out.rdbuf(cout.rdbuf());
  63    if (_config->FindI("quiet",0) > 0)
  64       c0out.rdbuf(devnull.rdbuf());
  65    if (_config->FindI("quiet",0) > 1)
  66       c1out.rdbuf(devnull.rdbuf());
  67
  68    // deal with window size changes
  69    signal(SIGWINCH,SigWinch);
  70    SigWinch(0);
  71
  72    if(!isatty(1))
  73    {
  74       _config->Set("APT::Color", "false");
  75       _config->Set("APT::Color::Highlight", "");
  76       _config->Set("APT::Color::Neutral", "");
  77    } else {
  78       // Colors
  79       _config->CndSet("APT::Color::Highlight", "\x1B[32m");
  80       _config->CndSet("APT::Color::Neutral", "\x1B[0m");
  81
  82       _config->CndSet("APT::Color::Red", "\x1B[31m");
  83       _config->CndSet("APT::Color::Green", "\x1B[32m");
  84       _config->CndSet("APT::Color::Yellow", "\x1B[33m");
  85       _config->CndSet("APT::Color::Blue", "\x1B[34m");
  86       _config->CndSet("APT::Color::Magenta", "\x1B[35m");
  87       _config->CndSet("APT::Color::Cyan", "\x1B[36m");
  88       _config->CndSet("APT::Color::White", "\x1B[37m");
  89    }
  90
  91    return true;
  92 }
  93                                                                         /*}}}*/
  94 static std::string GetArchiveSuite(pkgCacheFile &/*CacheFile*/, pkgCache::VerIterator ver) /*{{{*/
  95 {
  96    std::string suite = "";
  97    if (ver && ver.FileList())
  98    {
  99       pkgCache::VerFileIterator VF = ver.FileList();
 100       for (; VF.end() == false ; ++VF)
 101       {
 102          if(VF.File() == NULL || VF.File().Archive() == NULL)
 103             suite = suite + "," + _("unknown");
 104          else
 105             suite = suite + "," + VF.File().Archive();
 106          //suite = VF.File().Archive();
 107       }
 108       suite = suite.erase(0, 1);
 109    }
 110    return suite;
 111 }
 112                                                                         /*}}}*/
 113 static std::string GetFlagsStr(pkgCacheFile &CacheFile, pkgCache::PkgIterator P)/*{{{*/
 114 {
 115    pkgDepCache *DepCache = CacheFile.GetDepCache();
 116    pkgDepCache::StateCache &state = (*DepCache)[P];
 117
 118    std::string flags_str;
 119    if (state.NowBroken())
 120       flags_str = "B";
 121    if (P.CurrentVer() && state.Upgradable() && state.CandidateVer != NULL)
 122       flags_str = "g";
 123    else if (P.CurrentVer() != NULL)
 124       flags_str = "i";
 125    else
 126       flags_str = "-";
 127    return flags_str;
 128 }
 129                                                                         /*}}}*/
 130 static std::string GetCandidateVersion(pkgCacheFile &CacheFile, pkgCache::PkgIterator P)/*{{{*/
 131 {
 132    pkgPolicy *policy = CacheFile.GetPolicy();
 133    pkgCache::VerIterator cand = policy->GetCandidateVer(P);
 134
 135    return cand ? cand.VerStr() : "(none)";
 136 }
 137                                                                         /*}}}*/
 138 static std::string GetInstalledVersion(pkgCacheFile &/*CacheFile*/, pkgCache::PkgIterator P)/*{{{*/
 139 {
 140    pkgCache::VerIterator inst = P.CurrentVer();
 141
 142    return inst ? inst.VerStr() : "(none)";
 143 }
 144                                                                         /*}}}*/
 145 static std::string GetVersion(pkgCacheFile &/*CacheFile*/, pkgCache::VerIterator V)/*{{{*/
 146 {
 147    pkgCache::PkgIterator P = V.ParentPkg();
 148    if (V == P.CurrentVer())
 149    {
 150       std::string inst_str = DeNull(V.VerStr());
 151 #if 0 // FIXME: do we want this or something like this?
 152       pkgDepCache *DepCache = CacheFile.GetDepCache();
 153       pkgDepCache::StateCache &state = (*DepCache)[P];
 154       if (state.Upgradable())
 155          return "**"+inst_str;
 156 #endif
 157       return inst_str;
 158    }
 159
 160    if(V)
 161       return DeNull(V.VerStr());
 162    return "(none)";
 163 }
 164                                                                         /*}}}*/
 165 static std::string GetArchitecture(pkgCacheFile &CacheFile, pkgCache::PkgIterator P)/*{{{*/
 166 {
 167    pkgPolicy *policy = CacheFile.GetPolicy();
 168    pkgCache::VerIterator inst = P.CurrentVer();
 169    pkgCache::VerIterator cand = policy->GetCandidateVer(P);
 170
 171    // this may happen for packages in dpkg "deinstall ok config-file" state
 172    if (inst.IsGood() == false && cand.IsGood() == false)
 173       return P.VersionList().Arch();
 174
 175    return inst ? inst.Arch() : cand.Arch();
 176 }
 177                                                                         /*}}}*/
 178 static std::string GetShortDescription(pkgCacheFile &CacheFile, pkgRecords &records, pkgCache::PkgIterator P)/*{{{*/
 179 {
 180    pkgPolicy *policy = CacheFile.GetPolicy();
 181
 182    pkgCache::VerIterator ver;
 183    if (P.CurrentVer())
 184       ver = P.CurrentVer();
 185    else
 186       ver = policy->GetCandidateVer(P);
 187
 188    std::string ShortDescription = "(none)";
 189    if(ver)
 190    {
 191       pkgCache::DescIterator Desc = ver.TranslatedDescription();
 192       pkgRecords::Parser & parser = records.Lookup(Desc.FileList());
 193
 194       ShortDescription = parser.ShortDesc();
 195    }
 196    return ShortDescription;
 197 }
 198                                                                         /*}}}*/
 199 void ListSingleVersion(pkgCacheFile &CacheFile, pkgRecords &records,    /*{{{*/
 200                        pkgCache::VerIterator V, std::ostream &out,
 201                        bool include_summary)
 202 {
 203    pkgCache::PkgIterator P = V.ParentPkg();
 204
 205    pkgDepCache *DepCache = CacheFile.GetDepCache();
 206    pkgDepCache::StateCache &state = (*DepCache)[P];
 207
 208    std::string suite = GetArchiveSuite(CacheFile, V);
 209    std::string name_str = P.Name();
 210
 211    if (_config->FindB("APT::Cmd::use-format", false))
 212    {
 213       std::string format = _config->Find("APT::Cmd::format", "${db::Status-Abbrev} ${Package} ${Version} ${Origin} ${Description}");
 214       std::string output = format;
 215
 216       output = SubstVar(output, "${db::Status-Abbrev}", GetFlagsStr(CacheFile, P));
 217       output = SubstVar(output, "${Package}", name_str);
 218       output = SubstVar(output, "${installed:Version}", GetInstalledVersion(CacheFile, P));
 219       output = SubstVar(output, "${candidate:Version}", GetCandidateVersion(CacheFile, P));
 220       output = SubstVar(output, "${Version}", GetVersion(CacheFile, V));
 221       output = SubstVar(output, "${Description}", GetShortDescription(CacheFile, records, P));
 222       output = SubstVar(output, "${Origin}", GetArchiveSuite(CacheFile, V));
 223       out << output;
 224    } else {
 225       // raring/linux-kernel version [upradable: new-version]
 226       //    description
 227       pkgPolicy *policy = CacheFile.GetPolicy();
 228       std::string VersionStr = GetVersion(CacheFile, V);
 229       std::string CandidateVerStr = GetCandidateVersion(CacheFile, P);
 230       std::string InstalledVerStr = GetInstalledVersion(CacheFile, P);
 231       std::string StatusStr;
 232       if(P.CurrentVer() == V &&
 233          state.Upgradable() &&
 234          state.CandidateVer != NULL &&
 235          policy->GetCandidateVer(P) != P.CurrentVer())
 236       {
 237          strprintf(StatusStr, _("[installed,upgradable to: %s]"),
 238                    CandidateVerStr.c_str());
 239       } else if (P.CurrentVer() == V) {
 240          if(!V.Downloadable())
 241             StatusStr = _("[installed,local]");
 242          else
 243             if(V.Automatic() && state.Garbage)
 244                StatusStr = _("[installed,auto-removable]");
 245             else if (state.Flags & pkgCache::Flag::Auto)
 246                StatusStr = _("[installed,automatic]");
 247             else
 248                StatusStr = _("[installed]");
 249       } else if (P.CurrentVer() &&
 250                  policy->GetCandidateVer(P) == V &&
 251                  state.Upgradable()) {
 252             strprintf(StatusStr, _("[upgradable from: %s]"),
 253                       InstalledVerStr.c_str());
 254       } else {
 255          if (V.ParentPkg()->CurrentState == pkgCache::State::ConfigFiles)
 256             StatusStr = _("[residual-config]");
 257          else
 258             StatusStr = "";
 259       }
 260       out << std::setiosflags(std::ios::left)
 261           << _config->Find("APT::Color::Highlight", "")
 262           << name_str
 263           << _config->Find("APT::Color::Neutral", "")
 264           << "/" << suite
 265           << " "
 266           << VersionStr << " "
 267           << GetArchitecture(CacheFile, P);
 268       if (StatusStr != "")
 269          out << " " << StatusStr;
 270       if (include_summary)
 271       {
 272          out << std::endl
 273              << "  " << GetShortDescription(CacheFile, records, P)
 274              << std::endl;
 275       }
 276    }
 277 }
 278                                                                         /*}}}*/
 279 // ShowList - Show a list                                               /*{{{*/
 280 // ---------------------------------------------------------------------
 281 /* This prints out a string of space separated words with a title and
 282    a two space indent line wraped to the current screen width. */
 283 bool ShowList(ostream &out,string Title,string List,string VersionsList)
 284 {
 285    if (List.empty() == true)
 286       return true;
 287    // trim trailing space
 288    int NonSpace = List.find_last_not_of(' ');
 289    if (NonSpace != -1)
 290    {
 291       List = List.erase(NonSpace + 1);
 292       if (List.empty() == true)
 293          return true;
 294    }
 295
 296    // Acount for the leading space
 297    int ScreenWidth = ::ScreenWidth - 3;
 298
 299    out << Title << endl;
 300    string::size_type Start = 0;
 301    string::size_type VersionsStart = 0;
 302    while (Start < List.size())
 303    {
 304       if(_config->FindB("APT::Get::Show-Versions",false) == true &&
 305          VersionsList.size() > 0) {
 306          string::size_type End;
 307          string::size_type VersionsEnd;
 308
 309          End = List.find(' ',Start);
 310          VersionsEnd = VersionsList.find('\n', VersionsStart);
 311
 312          out << "   " << string(List,Start,End - Start) << " (" <<
 313             string(VersionsList,VersionsStart,VersionsEnd - VersionsStart) <<
 314             ")" << endl;
 315
 316          if (End == string::npos || End < Start)
 317             End = Start + ScreenWidth;
 318
 319          Start = End + 1;
 320          VersionsStart = VersionsEnd + 1;
 321       } else {
 322          string::size_type End;
 323
 324          if (Start + ScreenWidth >= List.size())
 325             End = List.size();
 326          else
 327             End = List.rfind(' ',Start+ScreenWidth);
 328
 329          if (End == string::npos || End < Start)
 330             End = Start + ScreenWidth;
 331          out << "  " << string(List,Start,End - Start) << endl;
 332          Start = End + 1;
 333       }
 334    }
 335
 336    return false;
 337 }
 338                                                                         /*}}}*/
 339 // ShowBroken - Debugging aide                                          /*{{{*/
 340 // ---------------------------------------------------------------------
 341 /* This prints out the names of all the packages that are broken along
 342    with the name of each each broken dependency and a quite version
 343    description.
 344
 345    The output looks like:
 346  The following packages have unmet dependencies:
 347      exim: Depends: libc6 (>= 2.1.94) but 2.1.3-10 is to be installed
 348            Depends: libldap2 (>= 2.0.2-2) but it is not going to be installed
 349            Depends: libsasl7 but it is not going to be installed
 350  */
 351 static void ShowBrokenPackage(ostream &out, pkgCacheFile * const Cache, pkgCache::PkgIterator const &Pkg, bool const Now)
 352 {
 353    if (Now == true)
 354    {
 355       if ((*Cache)[Pkg].NowBroken() == false)
 356          return;
 357    }
 358    else
 359    {
 360       if ((*Cache)[Pkg].InstBroken() == false)
 361          return;
 362    }
 363
 364    // Print out each package and the failed dependencies
 365    out << " " << Pkg.FullName(true) << " :";
 366    unsigned const Indent = Pkg.FullName(true).size() + 3;
 367    bool First = true;
 368    pkgCache::VerIterator Ver;
 369
 370    if (Now == true)
 371       Ver = Pkg.CurrentVer();
 372    else
 373       Ver = (*Cache)[Pkg].InstVerIter(*Cache);
 374
 375    if (Ver.end() == true)
 376    {
 377       out << endl;
 378       return;
 379    }
 380
 381    for (pkgCache::DepIterator D = Ver.DependsList(); D.end() == false;)
 382    {
 383       // Compute a single dependency element (glob or)
 384       pkgCache::DepIterator Start;
 385       pkgCache::DepIterator End;
 386       D.GlobOr(Start,End); // advances D
 387
 388       if ((*Cache)->IsImportantDep(End) == false)
 389          continue;
 390
 391       if (Now == true)
 392       {
 393          if (((*Cache)[End] & pkgDepCache::DepGNow) == pkgDepCache::DepGNow)
 394             continue;
 395       }
 396       else
 397       {
 398          if (((*Cache)[End] & pkgDepCache::DepGInstall) == pkgDepCache::DepGInstall)
 399             continue;
 400       }
 401
 402       bool FirstOr = true;
 403       while (1)
 404       {
 405          if (First == false)
 406             for (unsigned J = 0; J != Indent; J++)
 407                out << ' ';
 408          First = false;
 409
 410          if (FirstOr == false)
 411          {
 412             for (unsigned J = 0; J != strlen(End.DepType()) + 3; J++)
 413                out << ' ';
 414          }
 415          else
 416             out << ' ' << End.DepType() << ": ";
 417          FirstOr = false;
 418
 419          out << Start.TargetPkg().FullName(true);
 420
 421          // Show a quick summary of the version requirements
 422          if (Start.TargetVer() != 0)
 423             out << " (" << Start.CompType() << " " << Start.TargetVer() << ")";
 424
 425          /* Show a summary of the target package if possible. In the case
 426             of virtual packages we show nothing */
 427          pkgCache::PkgIterator Targ = Start.TargetPkg();
 428          if (Targ->ProvidesList == 0)
 429          {
 430             out << ' ';
 431             pkgCache::VerIterator Ver = (*Cache)[Targ].InstVerIter(*Cache);
 432             if (Now == true)
 433                Ver = Targ.CurrentVer();
 434
 435             if (Ver.end() == false)
 436             {
 437                if (Now == true)
 438                   ioprintf(out,_("but %s is installed"),Ver.VerStr());
 439                else
 440                   ioprintf(out,_("but %s is to be installed"),Ver.VerStr());
 441             }
 442             else
 443             {
 444                if ((*Cache)[Targ].CandidateVerIter(*Cache).end() == true)
 445                {
 446                   if (Targ->ProvidesList == 0)
 447                      out << _("but it is not installable");
 448                   else
 449                      out << _("but it is a virtual package");
 450                }
 451                else
 452                   out << (Now?_("but it is not installed"):_("but it is not going to be installed"));
 453             }
 454          }
 455
 456          if (Start != End)
 457             out << _(" or");
 458          out << endl;
 459
 460          if (Start == End)
 461             break;
 462          ++Start;
 463       }
 464    }
 465 }
 466 void ShowBroken(ostream &out, CacheFile &Cache, bool const Now)
 467 {
 468    if (Cache->BrokenCount() == 0)
 469       return;
 470
 471    out << _("The following packages have unmet dependencies:") << endl;
 472    for (unsigned J = 0; J < Cache->Head().PackageCount; J++)
 473    {
 474       pkgCache::PkgIterator const I(Cache,Cache.List[J]);
 475       ShowBrokenPackage(out, &Cache, I, Now);
 476    }
 477 }
 478 void ShowBroken(ostream &out, pkgCacheFile &Cache, bool const Now)
 479 {
 480    if (Cache->BrokenCount() == 0)
 481       return;
 482
 483    out << _("The following packages have unmet dependencies:") << endl;
 484    for (pkgCache::PkgIterator Pkg = Cache->PkgBegin(); Pkg.end() == false; ++Pkg)
 485       ShowBrokenPackage(out, &Cache, Pkg, Now);
 486 }
 487                                                                         /*}}}*/
 488 // ShowNew - Show packages to newly install                             /*{{{*/
 489 // ---------------------------------------------------------------------
 490 /* */
 491 void ShowNew(ostream &out,CacheFile &Cache)
 492 {
 493    /* Print out a list of packages that are going to be installed extra
 494       to what the user asked */
 495    string List;
 496    string VersionsList;
 497    for (unsigned J = 0; J < Cache->Head().PackageCount; J++)
 498    {
 499       pkgCache::PkgIterator I(Cache,Cache.List[J]);
 500       if (Cache[I].NewInstall() == true) {
 501          List += I.FullName(true) + " ";
 502          VersionsList += string(Cache[I].CandVersion) + "\n";
 503       }
 504    }
 505
 506    ShowList(out,_("The following NEW packages will be installed:"),List,VersionsList);
 507 }
 508                                                                         /*}}}*/
 509 // ShowDel - Show packages to delete                                    /*{{{*/
 510 // ---------------------------------------------------------------------
 511 /* */
 512 void ShowDel(ostream &out,CacheFile &Cache)
 513 {
 514    /* Print out a list of packages that are going to be removed extra
 515       to what the user asked */
 516    string List;
 517    string VersionsList;
 518    for (unsigned J = 0; J < Cache->Head().PackageCount; J++)
 519    {
 520       pkgCache::PkgIterator I(Cache,Cache.List[J]);
 521       if (Cache[I].Delete() == true)
 522       {
 523          if ((Cache[I].iFlags & pkgDepCache::Purge) == pkgDepCache::Purge)
 524             List += I.FullName(true) + "* ";
 525          else
 526             List += I.FullName(true) + " ";
 527
 528      VersionsList += string(Cache[I].CandVersion)+ "\n";
 529       }
 530    }
 531
 532    ShowList(out,_("The following packages will be REMOVED:"),List,VersionsList);
 533 }
 534                                                                         /*}}}*/
 535 // ShowKept - Show kept packages                                        /*{{{*/
 536 // ---------------------------------------------------------------------
 537 /* */
 538 void ShowKept(ostream &out,CacheFile &Cache)
 539 {
 540    string List;
 541    string VersionsList;
 542    for (unsigned J = 0; J < Cache->Head().PackageCount; J++)
 543    {
 544       pkgCache::PkgIterator I(Cache,Cache.List[J]);
 545
 546       // Not interesting
 547       if (Cache[I].Upgrade() == true || Cache[I].Upgradable() == false ||
 548           I->CurrentVer == 0 || Cache[I].Delete() == true)
 549          continue;
 550
 551       List += I.FullName(true) + " ";
 552       VersionsList += string(Cache[I].CurVersion) + " => " + Cache[I].CandVersion + "\n";
 553    }
 554    ShowList(out,_("The following packages have been kept back:"),List,VersionsList);
 555 }
 556                                                                         /*}}}*/
 557 // ShowUpgraded - Show upgraded packages                                /*{{{*/
 558 // ---------------------------------------------------------------------
 559 /* */
 560 void ShowUpgraded(ostream &out,CacheFile &Cache)
 561 {
 562    string List;
 563    string VersionsList;
 564    for (unsigned J = 0; J < Cache->Head().PackageCount; J++)
 565    {
 566       pkgCache::PkgIterator I(Cache,Cache.List[J]);
 567
 568       // Not interesting
 569       if (Cache[I].Upgrade() == false || Cache[I].NewInstall() == true)
 570          continue;
 571
 572       List += I.FullName(true) + " ";
 573       VersionsList += string(Cache[I].CurVersion) + " => " + Cache[I].CandVersion + "\n";
 574    }
 575    ShowList(out,_("The following packages will be upgraded:"),List,VersionsList);
 576 }
 577                                                                         /*}}}*/
 578 // ShowDowngraded - Show downgraded packages                            /*{{{*/
 579 // ---------------------------------------------------------------------
 580 /* */
 581 bool ShowDowngraded(ostream &out,CacheFile &Cache)
 582 {
 583    string List;
 584    string VersionsList;
 585    for (unsigned J = 0; J < Cache->Head().PackageCount; J++)
 586    {
 587       pkgCache::PkgIterator I(Cache,Cache.List[J]);
 588
 589       // Not interesting
 590       if (Cache[I].Downgrade() == false || Cache[I].NewInstall() == true)
 591          continue;
 592
 593       List += I.FullName(true) + " ";
 594       VersionsList += string(Cache[I].CurVersion) + " => " + Cache[I].CandVersion + "\n";
 595    }
 596    return ShowList(out,_("The following packages will be DOWNGRADED:"),List,VersionsList);
 597 }
 598                                                                         /*}}}*/
 599 // ShowHold - Show held but changed packages                            /*{{{*/
 600 // ---------------------------------------------------------------------
 601 /* */
 602 bool ShowHold(ostream &out,CacheFile &Cache)
 603 {
 604    string List;
 605    string VersionsList;
 606    for (unsigned J = 0; J < Cache->Head().PackageCount; J++)
 607    {
 608       pkgCache::PkgIterator I(Cache,Cache.List[J]);
 609       if (Cache[I].InstallVer != (pkgCache::Version *)I.CurrentVer() &&
 610           I->SelectedState == pkgCache::State::Hold) {
 611          List += I.FullName(true) + " ";
 612                  VersionsList += string(Cache[I].CurVersion) + " => " + Cache[I].CandVersion + "\n";
 613       }
 614    }
 615
 616    return ShowList(out,_("The following held packages will be changed:"),List,VersionsList);
 617 }
 618                                                                         /*}}}*/
 619 // ShowEssential - Show an essential package warning                    /*{{{*/
 620 // ---------------------------------------------------------------------
 621 /* This prints out a warning message that is not to be ignored. It shows
 622    all essential packages and their dependents that are to be removed.
 623    It is insanely risky to remove the dependents of an essential package! */
 624 bool ShowEssential(ostream &out,CacheFile &Cache)
 625 {
 626    string List;
 627    string VersionsList;
 628    bool *Added = new bool[Cache->Head().PackageCount];
 629    for (unsigned int I = 0; I != Cache->Head().PackageCount; I++)
 630       Added[I] = false;
 631
 632    for (unsigned J = 0; J < Cache->Head().PackageCount; J++)
 633    {
 634       pkgCache::PkgIterator I(Cache,Cache.List[J]);
 635       if ((I->Flags & pkgCache::Flag::Essential) != pkgCache::Flag::Essential &&
 636           (I->Flags & pkgCache::Flag::Important) != pkgCache::Flag::Important)
 637          continue;
 638
 639       // The essential package is being removed
 640       if (Cache[I].Delete() == true)
 641       {
 642          if (Added[I->ID] == false)
 643          {
 644             Added[I->ID] = true;
 645             List += I.FullName(true) + " ";
 646         //VersionsList += string(Cache[I].CurVersion) + "\n"; ???
 647          }
 648       }
 649       else
 650          continue;
 651
 652       if (I->CurrentVer == 0)
 653          continue;
 654
 655       // Print out any essential package depenendents that are to be removed
 656       for (pkgCache::DepIterator D = I.CurrentVer().DependsList(); D.end() == false; ++D)
 657       {
 658          // Skip everything but depends
 659          if (D->Type != pkgCache::Dep::PreDepends &&
 660              D->Type != pkgCache::Dep::Depends)
 661             continue;
 662
 663          pkgCache::PkgIterator P = D.SmartTargetPkg();
 664          if (Cache[P].Delete() == true)
 665          {
 666             if (Added[P->ID] == true)
 667                continue;
 668             Added[P->ID] = true;
 669
 670             char S[300];
 671             snprintf(S,sizeof(S),_("%s (due to %s) "),P.FullName(true).c_str(),I.FullName(true).c_str());
 672             List += S;
 673         //VersionsList += "\n"; ???
 674          }
 675       }
 676    }
 677
 678    delete [] Added;
 679    return ShowList(out,_("WARNING: The following essential packages will be removed.\n"
 680                          "This should NOT be done unless you know exactly what you are doing!"),List,VersionsList);
 681 }
 682
 683                                                                         /*}}}*/
 684 // Stats - Show some statistics                                         /*{{{*/
 685 // ---------------------------------------------------------------------
 686 /* */
 687 void Stats(ostream &out,pkgDepCache &Dep)
 688 {
 689    unsigned long Upgrade = 0;
 690    unsigned long Downgrade = 0;
 691    unsigned long Install = 0;
 692    unsigned long ReInstall = 0;
 693    for (pkgCache::PkgIterator I = Dep.PkgBegin(); I.end() == false; ++I)
 694    {
 695       if (Dep[I].NewInstall() == true)
 696          Install++;
 697       else
 698       {
 699          if (Dep[I].Upgrade() == true)
 700             Upgrade++;
 701          else
 702             if (Dep[I].Downgrade() == true)
 703                Downgrade++;
 704       }
 705
 706       if (Dep[I].Delete() == false && (Dep[I].iFlags & pkgDepCache::ReInstall) == pkgDepCache::ReInstall)
 707          ReInstall++;
 708    }
 709
 710    ioprintf(out,_("%lu upgraded, %lu newly installed, "),
 711             Upgrade,Install);
 712
 713    if (ReInstall != 0)
 714       ioprintf(out,_("%lu reinstalled, "),ReInstall);
 715    if (Downgrade != 0)
 716       ioprintf(out,_("%lu downgraded, "),Downgrade);
 717
 718    ioprintf(out,_("%lu to remove and %lu not upgraded.\n"),
 719             Dep.DelCount(),Dep.KeepCount());
 720
 721    if (Dep.BadCount() != 0)
 722       ioprintf(out,_("%lu not fully installed or removed.\n"),
 723                Dep.BadCount());
 724 }
 725                                                                         /*}}}*/
 726 // YnPrompt - Yes No Prompt.                                            /*{{{*/
 727 // ---------------------------------------------------------------------
 728 /* Returns true on a Yes.*/
 729 bool YnPrompt(bool Default)
 730 {
 731    /* nl_langinfo does not support LANGUAGE setting, so we unset it here
 732       to have the help-message (hopefully) match the expected characters */
 733    char * language = getenv("LANGUAGE");
 734    if (language != NULL)
 735       language = strdup(language);
 736    if (language != NULL)
 737       unsetenv("LANGUAGE");
 738
 739    if (Default == true)
 740       // TRANSLATOR: Yes/No question help-text: defaulting to Y[es]
 741       //             e.g. "Do you want to continue? [Y/n] "
 742       //             The user has to answer with an input matching the
 743       //             YESEXPR/NOEXPR defined in your l10n.
 744       c2out << " " << _("[Y/n]") << " " << std::flush;
 745    else
 746       // TRANSLATOR: Yes/No question help-text: defaulting to N[o]
 747       //             e.g. "Should this file be removed? [y/N] "
 748       //             The user has to answer with an input matching the
 749       //             YESEXPR/NOEXPR defined in your l10n.
 750       c2out << " " << _("[y/N]") << " " << std::flush;
 751
 752    if (language != NULL)
 753    {
 754       setenv("LANGUAGE", language, 0);
 755       free(language);
 756    }
 757
 758    if (_config->FindB("APT::Get::Assume-Yes",false) == true)
 759    {
 760       // TRANSLATOR: "Yes" answer printed for a yes/no question if --assume-yes is set
 761       c1out << _("Y") << std::endl;
 762       return true;
 763    }
 764    else if (_config->FindB("APT::Get::Assume-No",false) == true)
 765    {
 766       // TRANSLATOR: "No" answer printed for a yes/no question if --assume-no is set
 767       c1out << _("N") << std::endl;
 768       return false;
 769    }
 770
 771    char response[1024] = "";
 772    std::cin.getline(response, sizeof(response));
 773
 774    if (!std::cin)
 775       return false;
 776
 777    if (strlen(response) == 0)
 778       return Default;
 779
 780    regex_t Pattern;
 781    int Res;
 782
 783    Res = regcomp(&Pattern, nl_langinfo(YESEXPR),
 784                  REG_EXTENDED|REG_ICASE|REG_NOSUB);
 785
 786    if (Res != 0) {
 787       char Error[300];
 788       regerror(Res,&Pattern,Error,sizeof(Error));
 789       return _error->Error(_("Regex compilation error - %s"),Error);
 790    }
 791
 792    Res = regexec(&Pattern, response, 0, NULL, 0);
 793    if (Res == 0)
 794       return true;
 795    return false;
 796 }
 797                                                                         /*}}}*/
 798 // AnalPrompt - Annoying Yes No Prompt.                                 /*{{{*/
 799 // ---------------------------------------------------------------------
 800 /* Returns true on a Yes.*/
 801 bool AnalPrompt(const char *Text)
 802 {
 803    char Buf[1024];
 804    std::cin.getline(Buf,sizeof(Buf));
 805    if (strcmp(Buf,Text) == 0)
 806       return true;
 807    return false;
 808 }
 809                                                                         /*}}}*/