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 && state.Upgradable())
 233       {
 234          strprintf(StatusStr, _("[installed,upgradable to: %s]"),
 235                    CandidateVerStr.c_str());
 236       } else if (P.CurrentVer() == V) {
 237          if(!V.Downloadable())
 238             StatusStr = _("[installed,local]");
 239          else
 240             if(V.Automatic() && state.Garbage)
 241                StatusStr = _("[installed,auto-removable]");
 242             else if (state.Flags & pkgCache::Flag::Auto)
 243                StatusStr = _("[installed,automatic]");
 244             else
 245                StatusStr = _("[installed]");
 246       } else if (P.CurrentVer() &&
 247                  policy->GetCandidateVer(P) == V &&
 248                  state.Upgradable()) {
 249             strprintf(StatusStr, _("[upgradable from: %s]"),
 250                       InstalledVerStr.c_str());
 251       } else {
 252          if (V.ParentPkg()->CurrentState == pkgCache::State::ConfigFiles)
 253             StatusStr = _("[residual-config]");
 254          else
 255             StatusStr = "";
 256       }
 257       out << std::setiosflags(std::ios::left)
 258           << _config->Find("APT::Color::Highlight", "")
 259           << name_str
 260           << _config->Find("APT::Color::Neutral", "")
 261           << "/" << suite
 262           << " "
 263           << VersionStr << " "
 264           << GetArchitecture(CacheFile, P);
 265       if (StatusStr != "")
 266          out << " " << StatusStr;
 267       if (include_summary)
 268       {
 269          out << std::endl
 270              << "  " << GetShortDescription(CacheFile, records, P)
 271              << std::endl;
 272       }
 273    }
 274 }
 275                                                                         /*}}}*/
 276 // ShowList - Show a list                                               /*{{{*/
 277 // ---------------------------------------------------------------------
 278 /* This prints out a string of space separated words with a title and
 279    a two space indent line wraped to the current screen width. */
 280 bool ShowList(ostream &out,string Title,string List,string VersionsList)
 281 {
 282    if (List.empty() == true)
 283       return true;
 284    // trim trailing space
 285    int NonSpace = List.find_last_not_of(' ');
 286    if (NonSpace != -1)
 287    {
 288       List = List.erase(NonSpace + 1);
 289       if (List.empty() == true)
 290          return true;
 291    }
 292
 293    // Acount for the leading space
 294    int ScreenWidth = ::ScreenWidth - 3;
 295
 296    out << Title << endl;
 297    string::size_type Start = 0;
 298    string::size_type VersionsStart = 0;
 299    while (Start < List.size())
 300    {
 301       if(_config->FindB("APT::Get::Show-Versions",false) == true &&
 302          VersionsList.size() > 0) {
 303          string::size_type End;
 304          string::size_type VersionsEnd;
 305
 306          End = List.find(' ',Start);
 307          VersionsEnd = VersionsList.find('\n', VersionsStart);
 308
 309          out << "   " << string(List,Start,End - Start) << " (" <<
 310             string(VersionsList,VersionsStart,VersionsEnd - VersionsStart) <<
 311             ")" << endl;
 312
 313          if (End == string::npos || End < Start)
 314             End = Start + ScreenWidth;
 315
 316          Start = End + 1;
 317          VersionsStart = VersionsEnd + 1;
 318       } else {
 319          string::size_type End;
 320
 321          if (Start + ScreenWidth >= List.size())
 322             End = List.size();
 323          else
 324             End = List.rfind(' ',Start+ScreenWidth);
 325
 326          if (End == string::npos || End < Start)
 327             End = Start + ScreenWidth;
 328          out << "  " << string(List,Start,End - Start) << endl;
 329          Start = End + 1;
 330       }
 331    }
 332
 333    return false;
 334 }
 335                                                                         /*}}}*/
 336 // ShowBroken - Debugging aide                                          /*{{{*/
 337 // ---------------------------------------------------------------------
 338 /* This prints out the names of all the packages that are broken along
 339    with the name of each each broken dependency and a quite version
 340    description.
 341
 342    The output looks like:
 343  The following packages have unmet dependencies:
 344      exim: Depends: libc6 (>= 2.1.94) but 2.1.3-10 is to be installed
 345            Depends: libldap2 (>= 2.0.2-2) but it is not going to be installed
 346            Depends: libsasl7 but it is not going to be installed
 347  */
 348 static void ShowBrokenPackage(ostream &out, pkgCacheFile * const Cache, pkgCache::PkgIterator const &Pkg, bool const Now)
 349 {
 350    if (Now == true)
 351    {
 352       if ((*Cache)[Pkg].NowBroken() == false)
 353          return;
 354    }
 355    else
 356    {
 357       if ((*Cache)[Pkg].InstBroken() == false)
 358          return;
 359    }
 360
 361    // Print out each package and the failed dependencies
 362    out << " " << Pkg.FullName(true) << " :";
 363    unsigned const Indent = Pkg.FullName(true).size() + 3;
 364    bool First = true;
 365    pkgCache::VerIterator Ver;
 366
 367    if (Now == true)
 368       Ver = Pkg.CurrentVer();
 369    else
 370       Ver = (*Cache)[Pkg].InstVerIter(*Cache);
 371
 372    if (Ver.end() == true)
 373    {
 374       out << endl;
 375       return;
 376    }
 377
 378    for (pkgCache::DepIterator D = Ver.DependsList(); D.end() == false;)
 379    {
 380       // Compute a single dependency element (glob or)
 381       pkgCache::DepIterator Start;
 382       pkgCache::DepIterator End;
 383       D.GlobOr(Start,End); // advances D
 384
 385       if ((*Cache)->IsImportantDep(End) == false)
 386          continue;
 387
 388       if (Now == true)
 389       {
 390          if (((*Cache)[End] & pkgDepCache::DepGNow) == pkgDepCache::DepGNow)
 391             continue;
 392       }
 393       else
 394       {
 395          if (((*Cache)[End] & pkgDepCache::DepGInstall) == pkgDepCache::DepGInstall)
 396             continue;
 397       }
 398
 399       bool FirstOr = true;
 400       while (1)
 401       {
 402          if (First == false)
 403             for (unsigned J = 0; J != Indent; J++)
 404                out << ' ';
 405          First = false;
 406
 407          if (FirstOr == false)
 408          {
 409             for (unsigned J = 0; J != strlen(End.DepType()) + 3; J++)
 410                out << ' ';
 411          }
 412          else
 413             out << ' ' << End.DepType() << ": ";
 414          FirstOr = false;
 415
 416          out << Start.TargetPkg().FullName(true);
 417
 418          // Show a quick summary of the version requirements
 419          if (Start.TargetVer() != 0)
 420             out << " (" << Start.CompType() << " " << Start.TargetVer() << ")";
 421
 422          /* Show a summary of the target package if possible. In the case
 423             of virtual packages we show nothing */
 424          pkgCache::PkgIterator Targ = Start.TargetPkg();
 425          if (Targ->ProvidesList == 0)
 426          {
 427             out << ' ';
 428             pkgCache::VerIterator Ver = (*Cache)[Targ].InstVerIter(*Cache);
 429             if (Now == true)
 430                Ver = Targ.CurrentVer();
 431
 432             if (Ver.end() == false)
 433             {
 434                if (Now == true)
 435                   ioprintf(out,_("but %s is installed"),Ver.VerStr());
 436                else
 437                   ioprintf(out,_("but %s is to be installed"),Ver.VerStr());
 438             }
 439             else
 440             {
 441                if ((*Cache)[Targ].CandidateVerIter(*Cache).end() == true)
 442                {
 443                   if (Targ->ProvidesList == 0)
 444                      out << _("but it is not installable");
 445                   else
 446                      out << _("but it is a virtual package");
 447                }
 448                else
 449                   out << (Now?_("but it is not installed"):_("but it is not going to be installed"));
 450             }
 451          }
 452
 453          if (Start != End)
 454             out << _(" or");
 455          out << endl;
 456
 457          if (Start == End)
 458             break;
 459          ++Start;
 460       }
 461    }
 462 }
 463 void ShowBroken(ostream &out, CacheFile &Cache, bool const Now)
 464 {
 465    if (Cache->BrokenCount() == 0)
 466       return;
 467
 468    out << _("The following packages have unmet dependencies:") << endl;
 469    for (unsigned J = 0; J < Cache->Head().PackageCount; J++)
 470    {
 471       pkgCache::PkgIterator const I(Cache,Cache.List[J]);
 472       ShowBrokenPackage(out, &Cache, I, Now);
 473    }
 474 }
 475 void ShowBroken(ostream &out, pkgCacheFile &Cache, bool const Now)
 476 {
 477    if (Cache->BrokenCount() == 0)
 478       return;
 479
 480    out << _("The following packages have unmet dependencies:") << endl;
 481    for (pkgCache::PkgIterator Pkg = Cache->PkgBegin(); Pkg.end() == false; ++Pkg)
 482       ShowBrokenPackage(out, &Cache, Pkg, Now);
 483 }
 484                                                                         /*}}}*/
 485 // ShowNew - Show packages to newly install                             /*{{{*/
 486 // ---------------------------------------------------------------------
 487 /* */
 488 void ShowNew(ostream &out,CacheFile &Cache)
 489 {
 490    /* Print out a list of packages that are going to be installed extra
 491       to what the user asked */
 492    string List;
 493    string VersionsList;
 494    for (unsigned J = 0; J < Cache->Head().PackageCount; J++)
 495    {
 496       pkgCache::PkgIterator I(Cache,Cache.List[J]);
 497       if (Cache[I].NewInstall() == true) {
 498          List += I.FullName(true) + " ";
 499          VersionsList += string(Cache[I].CandVersion) + "\n";
 500       }
 501    }
 502
 503    ShowList(out,_("The following NEW packages will be installed:"),List,VersionsList);
 504 }
 505                                                                         /*}}}*/
 506 // ShowDel - Show packages to delete                                    /*{{{*/
 507 // ---------------------------------------------------------------------
 508 /* */
 509 void ShowDel(ostream &out,CacheFile &Cache)
 510 {
 511    /* Print out a list of packages that are going to be removed extra
 512       to what the user asked */
 513    string List;
 514    string VersionsList;
 515    for (unsigned J = 0; J < Cache->Head().PackageCount; J++)
 516    {
 517       pkgCache::PkgIterator I(Cache,Cache.List[J]);
 518       if (Cache[I].Delete() == true)
 519       {
 520          if ((Cache[I].iFlags & pkgDepCache::Purge) == pkgDepCache::Purge)
 521             List += I.FullName(true) + "* ";
 522          else
 523             List += I.FullName(true) + " ";
 524
 525      VersionsList += string(Cache[I].CandVersion)+ "\n";
 526       }
 527    }
 528
 529    ShowList(out,_("The following packages will be REMOVED:"),List,VersionsList);
 530 }
 531                                                                         /*}}}*/
 532 // ShowKept - Show kept packages                                        /*{{{*/
 533 // ---------------------------------------------------------------------
 534 /* */
 535 void ShowKept(ostream &out,CacheFile &Cache)
 536 {
 537    string List;
 538    string VersionsList;
 539    for (unsigned J = 0; J < Cache->Head().PackageCount; J++)
 540    {
 541       pkgCache::PkgIterator I(Cache,Cache.List[J]);
 542
 543       // Not interesting
 544       if (Cache[I].Upgrade() == true || Cache[I].Upgradable() == false ||
 545           I->CurrentVer == 0 || Cache[I].Delete() == true)
 546          continue;
 547
 548       List += I.FullName(true) + " ";
 549       VersionsList += string(Cache[I].CurVersion) + " => " + Cache[I].CandVersion + "\n";
 550    }
 551    ShowList(out,_("The following packages have been kept back:"),List,VersionsList);
 552 }
 553                                                                         /*}}}*/
 554 // ShowUpgraded - Show upgraded packages                                /*{{{*/
 555 // ---------------------------------------------------------------------
 556 /* */
 557 void ShowUpgraded(ostream &out,CacheFile &Cache)
 558 {
 559    string List;
 560    string VersionsList;
 561    for (unsigned J = 0; J < Cache->Head().PackageCount; J++)
 562    {
 563       pkgCache::PkgIterator I(Cache,Cache.List[J]);
 564
 565       // Not interesting
 566       if (Cache[I].Upgrade() == false || Cache[I].NewInstall() == true)
 567          continue;
 568
 569       List += I.FullName(true) + " ";
 570       VersionsList += string(Cache[I].CurVersion) + " => " + Cache[I].CandVersion + "\n";
 571    }
 572    ShowList(out,_("The following packages will be upgraded:"),List,VersionsList);
 573 }
 574                                                                         /*}}}*/
 575 // ShowDowngraded - Show downgraded packages                            /*{{{*/
 576 // ---------------------------------------------------------------------
 577 /* */
 578 bool ShowDowngraded(ostream &out,CacheFile &Cache)
 579 {
 580    string List;
 581    string VersionsList;
 582    for (unsigned J = 0; J < Cache->Head().PackageCount; J++)
 583    {
 584       pkgCache::PkgIterator I(Cache,Cache.List[J]);
 585
 586       // Not interesting
 587       if (Cache[I].Downgrade() == false || Cache[I].NewInstall() == true)
 588          continue;
 589
 590       List += I.FullName(true) + " ";
 591       VersionsList += string(Cache[I].CurVersion) + " => " + Cache[I].CandVersion + "\n";
 592    }
 593    return ShowList(out,_("The following packages will be DOWNGRADED:"),List,VersionsList);
 594 }
 595                                                                         /*}}}*/
 596 // ShowHold - Show held but changed packages                            /*{{{*/
 597 // ---------------------------------------------------------------------
 598 /* */
 599 bool ShowHold(ostream &out,CacheFile &Cache)
 600 {
 601    string List;
 602    string VersionsList;
 603    for (unsigned J = 0; J < Cache->Head().PackageCount; J++)
 604    {
 605       pkgCache::PkgIterator I(Cache,Cache.List[J]);
 606       if (Cache[I].InstallVer != (pkgCache::Version *)I.CurrentVer() &&
 607           I->SelectedState == pkgCache::State::Hold) {
 608          List += I.FullName(true) + " ";
 609                  VersionsList += string(Cache[I].CurVersion) + " => " + Cache[I].CandVersion + "\n";
 610       }
 611    }
 612
 613    return ShowList(out,_("The following held packages will be changed:"),List,VersionsList);
 614 }
 615                                                                         /*}}}*/
 616 // ShowEssential - Show an essential package warning                    /*{{{*/
 617 // ---------------------------------------------------------------------
 618 /* This prints out a warning message that is not to be ignored. It shows
 619    all essential packages and their dependents that are to be removed.
 620    It is insanely risky to remove the dependents of an essential package! */
 621 bool ShowEssential(ostream &out,CacheFile &Cache)
 622 {
 623    string List;
 624    string VersionsList;
 625    bool *Added = new bool[Cache->Head().PackageCount];
 626    for (unsigned int I = 0; I != Cache->Head().PackageCount; I++)
 627       Added[I] = false;
 628
 629    for (unsigned J = 0; J < Cache->Head().PackageCount; J++)
 630    {
 631       pkgCache::PkgIterator I(Cache,Cache.List[J]);
 632       if ((I->Flags & pkgCache::Flag::Essential) != pkgCache::Flag::Essential &&
 633           (I->Flags & pkgCache::Flag::Important) != pkgCache::Flag::Important)
 634          continue;
 635
 636       // The essential package is being removed
 637       if (Cache[I].Delete() == true)
 638       {
 639          if (Added[I->ID] == false)
 640          {
 641             Added[I->ID] = true;
 642             List += I.FullName(true) + " ";
 643         //VersionsList += string(Cache[I].CurVersion) + "\n"; ???
 644          }
 645       }
 646       else
 647          continue;
 648
 649       if (I->CurrentVer == 0)
 650          continue;
 651
 652       // Print out any essential package depenendents that are to be removed
 653       for (pkgCache::DepIterator D = I.CurrentVer().DependsList(); D.end() == false; ++D)
 654       {
 655          // Skip everything but depends
 656          if (D->Type != pkgCache::Dep::PreDepends &&
 657              D->Type != pkgCache::Dep::Depends)
 658             continue;
 659
 660          pkgCache::PkgIterator P = D.SmartTargetPkg();
 661          if (Cache[P].Delete() == true)
 662          {
 663             if (Added[P->ID] == true)
 664                continue;
 665             Added[P->ID] = true;
 666
 667             char S[300];
 668             snprintf(S,sizeof(S),_("%s (due to %s) "),P.FullName(true).c_str(),I.FullName(true).c_str());
 669             List += S;
 670         //VersionsList += "\n"; ???
 671          }
 672       }
 673    }
 674
 675    delete [] Added;
 676    return ShowList(out,_("WARNING: The following essential packages will be removed.\n"
 677                          "This should NOT be done unless you know exactly what you are doing!"),List,VersionsList);
 678 }
 679
 680                                                                         /*}}}*/
 681 // Stats - Show some statistics                                         /*{{{*/
 682 // ---------------------------------------------------------------------
 683 /* */
 684 void Stats(ostream &out,pkgDepCache &Dep)
 685 {
 686    unsigned long Upgrade = 0;
 687    unsigned long Downgrade = 0;
 688    unsigned long Install = 0;
 689    unsigned long ReInstall = 0;
 690    for (pkgCache::PkgIterator I = Dep.PkgBegin(); I.end() == false; ++I)
 691    {
 692       if (Dep[I].NewInstall() == true)
 693          Install++;
 694       else
 695       {
 696          if (Dep[I].Upgrade() == true)
 697             Upgrade++;
 698          else
 699             if (Dep[I].Downgrade() == true)
 700                Downgrade++;
 701       }
 702
 703       if (Dep[I].Delete() == false && (Dep[I].iFlags & pkgDepCache::ReInstall) == pkgDepCache::ReInstall)
 704          ReInstall++;
 705    }
 706
 707    ioprintf(out,_("%lu upgraded, %lu newly installed, "),
 708             Upgrade,Install);
 709
 710    if (ReInstall != 0)
 711       ioprintf(out,_("%lu reinstalled, "),ReInstall);
 712    if (Downgrade != 0)
 713       ioprintf(out,_("%lu downgraded, "),Downgrade);
 714
 715    ioprintf(out,_("%lu to remove and %lu not upgraded.\n"),
 716             Dep.DelCount(),Dep.KeepCount());
 717
 718    if (Dep.BadCount() != 0)
 719       ioprintf(out,_("%lu not fully installed or removed.\n"),
 720                Dep.BadCount());
 721 }
 722                                                                         /*}}}*/
 723 // YnPrompt - Yes No Prompt.                                            /*{{{*/
 724 // ---------------------------------------------------------------------
 725 /* Returns true on a Yes.*/
 726 bool YnPrompt(bool Default)
 727 {
 728    /* nl_langinfo does not support LANGUAGE setting, so we unset it here
 729       to have the help-message (hopefully) match the expected characters */
 730    char * language = getenv("LANGUAGE");
 731    if (language != NULL)
 732       language = strdup(language);
 733    if (language != NULL)
 734       unsetenv("LANGUAGE");
 735
 736    if (Default == true)
 737       // TRANSLATOR: Yes/No question help-text: defaulting to Y[es]
 738       //             e.g. "Do you want to continue? [Y/n] "
 739       //             The user has to answer with an input matching the
 740       //             YESEXPR/NOEXPR defined in your l10n.
 741       c2out << " " << _("[Y/n]") << " " << std::flush;
 742    else
 743       // TRANSLATOR: Yes/No question help-text: defaulting to N[o]
 744       //             e.g. "Should this file be removed? [y/N] "
 745       //             The user has to answer with an input matching the
 746       //             YESEXPR/NOEXPR defined in your l10n.
 747       c2out << " " << _("[y/N]") << " " << std::flush;
 748
 749    if (language != NULL)
 750    {
 751       setenv("LANGUAGE", language, 0);
 752       free(language);
 753    }
 754
 755    if (_config->FindB("APT::Get::Assume-Yes",false) == true)
 756    {
 757       // TRANSLATOR: "Yes" answer printed for a yes/no question if --assume-yes is set
 758       c1out << _("Y") << std::endl;
 759       return true;
 760    }
 761    else if (_config->FindB("APT::Get::Assume-No",false) == true)
 762    {
 763       // TRANSLATOR: "No" answer printed for a yes/no question if --assume-no is set
 764       c1out << _("N") << std::endl;
 765       return false;
 766    }
 767
 768    char response[1024] = "";
 769    std::cin.getline(response, sizeof(response));
 770
 771    if (!std::cin)
 772       return false;
 773
 774    if (strlen(response) == 0)
 775       return Default;
 776
 777    regex_t Pattern;
 778    int Res;
 779
 780    Res = regcomp(&Pattern, nl_langinfo(YESEXPR),
 781                  REG_EXTENDED|REG_ICASE|REG_NOSUB);
 782
 783    if (Res != 0) {
 784       char Error[300];
 785       regerror(Res,&Pattern,Error,sizeof(Error));
 786       return _error->Error(_("Regex compilation error - %s"),Error);
 787    }
 788
 789    Res = regexec(&Pattern, response, 0, NULL, 0);
 790    if (Res == 0)
 791       return true;
 792    return false;
 793 }
 794                                                                         /*}}}*/
 795 // AnalPrompt - Annoying Yes No Prompt.                                 /*{{{*/
 796 // ---------------------------------------------------------------------
 797 /* Returns true on a Yes.*/
 798 bool AnalPrompt(const char *Text)
 799 {
 800    char Buf[1024];
 801    std::cin.getline(Buf,sizeof(Buf));
 802    if (strcmp(Buf,Text) == 0)
 803       return true;
 804    return false;
 805 }
 806                                                                         /*}}}*/