apt-pkg/deb/deblistparser.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: deblistparser.cc,v 1.29.2.5 2004/01/06 01:43:44 mdz Exp $
   4 /* ######################################################################
   5
   6    Package Cache Generator - Generator for the cache structure.
   7
   8    This builds the cache structure from the abstract package list parser.
   9
  10    ##################################################################### */
  11                                                                         /*}}}*/
  12 // Include Files                                                        /*{{{*/
  13 #include <config.h>
  14
  15 #include <apt-pkg/deblistparser.h>
  16 #include <apt-pkg/error.h>
  17 #include <apt-pkg/configuration.h>
  18 #include <apt-pkg/cachefilter.h>
  19 #include <apt-pkg/aptconfiguration.h>
  20 #include <apt-pkg/strutl.h>
  21 #include <apt-pkg/fileutl.h>
  22 #include <apt-pkg/crc-16.h>
  23 #include <apt-pkg/md5.h>
  24 #include <apt-pkg/macros.h>
  25
  26 #include <ctype.h>
  27                                                                         /*}}}*/
  28
  29 using std::string;
  30
  31 static debListParser::WordList PrioList[] = {{"important",pkgCache::State::Important},
  32                        {"required",pkgCache::State::Required},
  33                        {"standard",pkgCache::State::Standard},
  34                        {"optional",pkgCache::State::Optional},
  35                        {"extra",pkgCache::State::Extra},
  36                        {}};
  37
  38 // ListParser::debListParser - Constructor                              /*{{{*/
  39 // ---------------------------------------------------------------------
  40 /* Provide an architecture and only this one and "all" will be accepted
  41    in Step(), if no Architecture is given we will accept every arch
  42    we would accept in general with checkArchitecture() */
  43 debListParser::debListParser(FileFd *File, string const &Arch) : Tags(File),
  44                                 Arch(Arch) {
  45    if (Arch == "native")
  46       this->Arch = _config->Find("APT::Architecture");
  47    Architectures = APT::Configuration::getArchitectures();
  48    MultiArchEnabled = Architectures.size() > 1;
  49 }
  50                                                                         /*}}}*/
  51 // ListParser::UniqFindTagWrite - Find the tag and write a unq string   /*{{{*/
  52 // ---------------------------------------------------------------------
  53 /* */
  54 unsigned long debListParser::UniqFindTagWrite(const char *Tag)
  55 {
  56    const char *Start;
  57    const char *Stop;
  58    if (Section.Find(Tag,Start,Stop) == false)
  59       return 0;
  60    return WriteUniqString(Start,Stop - Start);
  61 }
  62                                                                         /*}}}*/
  63 // ListParser::Package - Return the package name                        /*{{{*/
  64 // ---------------------------------------------------------------------
  65 /* This is to return the name of the package this section describes */
  66 string debListParser::Package() {
  67    string const Result = Section.FindS("Package");
  68    if(unlikely(Result.empty() == true))
  69       _error->Error("Encountered a section with no Package: header");
  70    return Result;
  71 }
  72                                                                         /*}}}*/
  73 // ListParser::Architecture - Return the package arch                   /*{{{*/
  74 // ---------------------------------------------------------------------
  75 /* This will return the Architecture of the package this section describes */
  76 string debListParser::Architecture() {
  77    return Section.FindS("Architecture");
  78 }
  79                                                                         /*}}}*/
  80 // ListParser::ArchitectureAll                                          /*{{{*/
  81 // ---------------------------------------------------------------------
  82 /* */
  83 bool debListParser::ArchitectureAll() {
  84    return Section.FindS("Architecture") == "all";
  85 }
  86                                                                         /*}}}*/
  87 // ListParser::Version - Return the version string                      /*{{{*/
  88 // ---------------------------------------------------------------------
  89 /* This is to return the string describing the version in debian form,
  90    epoch:upstream-release. If this returns the blank string then the
  91    entry is assumed to only describe package properties */
  92 string debListParser::Version()
  93 {
  94    return Section.FindS("Version");
  95 }
  96                                                                         /*}}}*/
  97 // ListParser::NewVersion - Fill in the version structure               /*{{{*/
  98 // ---------------------------------------------------------------------
  99 /* */
 100 bool debListParser::NewVersion(pkgCache::VerIterator &Ver)
 101 {
 102    // Parse the section
 103    Ver->Section = UniqFindTagWrite("Section");
 104
 105    // Parse multi-arch
 106    string const MultiArch = Section.FindS("Multi-Arch");
 107    if (MultiArch.empty() == true)
 108       Ver->MultiArch = pkgCache::Version::None;
 109    else if (MultiArch == "same") {
 110       // Parse multi-arch
 111       if (ArchitectureAll() == true)
 112       {
 113          /* Arch all packages can't be Multi-Arch: same */
 114          _error->Warning("Architecture: all package '%s' can't be Multi-Arch: same",
 115                         Section.FindS("Package").c_str());
 116          Ver->MultiArch = pkgCache::Version::None;
 117       }
 118       else
 119          Ver->MultiArch = pkgCache::Version::Same;
 120    }
 121    else if (MultiArch == "foreign")
 122       Ver->MultiArch = pkgCache::Version::Foreign;
 123    else if (MultiArch == "allowed")
 124       Ver->MultiArch = pkgCache::Version::Allowed;
 125    else
 126    {
 127       _error->Warning("Unknown Multi-Arch type '%s' for package '%s'",
 128                         MultiArch.c_str(), Section.FindS("Package").c_str());
 129       Ver->MultiArch = pkgCache::Version::None;
 130    }
 131
 132    if (ArchitectureAll() == true)
 133       Ver->MultiArch |= pkgCache::Version::All;
 134
 135    // Archive Size
 136    Ver->Size = Section.FindULL("Size");
 137    // Unpacked Size (in K)
 138    Ver->InstalledSize = Section.FindULL("Installed-Size");
 139    Ver->InstalledSize *= 1024;
 140
 141    // Priority
 142    const char *Start;
 143    const char *Stop;
 144    if (Section.Find("Priority",Start,Stop) == true)
 145    {
 146       if (GrabWord(string(Start,Stop-Start),PrioList,Ver->Priority) == false)
 147          Ver->Priority = pkgCache::State::Extra;
 148    }
 149
 150    if (ParseDepends(Ver,"Depends",pkgCache::Dep::Depends) == false)
 151       return false;
 152    if (ParseDepends(Ver,"Pre-Depends",pkgCache::Dep::PreDepends) == false)
 153       return false;
 154    if (ParseDepends(Ver,"Suggests",pkgCache::Dep::Suggests) == false)
 155       return false;
 156    if (ParseDepends(Ver,"Recommends",pkgCache::Dep::Recommends) == false)
 157       return false;
 158    if (ParseDepends(Ver,"Conflicts",pkgCache::Dep::Conflicts) == false)
 159       return false;
 160    if (ParseDepends(Ver,"Breaks",pkgCache::Dep::DpkgBreaks) == false)
 161       return false;
 162    if (ParseDepends(Ver,"Replaces",pkgCache::Dep::Replaces) == false)
 163       return false;
 164    if (ParseDepends(Ver,"Enhances",pkgCache::Dep::Enhances) == false)
 165       return false;
 166
 167    // Obsolete.
 168    if (ParseDepends(Ver,"Optional",pkgCache::Dep::Suggests) == false)
 169       return false;
 170
 171    if (ParseProvides(Ver) == false)
 172       return false;
 173
 174    return true;
 175 }
 176                                                                         /*}}}*/
 177 // ListParser::Description - Return the description string              /*{{{*/
 178 // ---------------------------------------------------------------------
 179 /* This is to return the string describing the package in debian
 180    form. If this returns the blank string then the entry is assumed to
 181    only describe package properties */
 182 string debListParser::Description()
 183 {
 184    string const lang = DescriptionLanguage();
 185    if (lang.empty())
 186       return Section.FindS("Description");
 187    else
 188       return Section.FindS(string("Description-").append(lang).c_str());
 189 }
 190                                                                         /*}}}*/
 191 // ListParser::DescriptionLanguage - Return the description lang string /*{{{*/
 192 // ---------------------------------------------------------------------
 193 /* This is to return the string describing the language of
 194    description. If this returns the blank string then the entry is
 195    assumed to describe original description. */
 196 string debListParser::DescriptionLanguage()
 197 {
 198    if (Section.FindS("Description").empty() == false)
 199       return "";
 200
 201    std::vector<string> const lang = APT::Configuration::getLanguages(true);
 202    for (std::vector<string>::const_iterator l = lang.begin();
 203         l != lang.end(); ++l)
 204       if (Section.FindS(string("Description-").append(*l).c_str()).empty() == false)
 205          return *l;
 206
 207    return "";
 208 }
 209                                                                         /*}}}*/
 210 // ListParser::Description - Return the description_md5 MD5SumValue     /*{{{*/
 211 // ---------------------------------------------------------------------
 212 /* This is to return the md5 string to allow the check if it is the right
 213    description. If no Description-md5 is found in the section it will be
 214    calculated.
 215  */
 216 MD5SumValue debListParser::Description_md5()
 217 {
 218    string const value = Section.FindS("Description-md5");
 219    if (value.empty() == true)
 220    {
 221       MD5Summation md5;
 222       md5.Add((Description() + "\n").c_str());
 223       return md5.Result();
 224    }
 225    else if (likely(value.size() == 32))
 226    {
 227       if (likely(value.find_first_not_of("0123456789abcdefABCDEF") == string::npos))
 228          return MD5SumValue(value);
 229       _error->Error("Malformed Description-md5 line; includes invalid character '%s'", value.c_str());
 230       return MD5SumValue();
 231    }
 232    _error->Error("Malformed Description-md5 line; doesn't have the required length (32 != %d) '%s'", (int)value.size(), value.c_str());
 233    return MD5SumValue();
 234 }
 235                                                                         /*}}}*/
 236 // ListParser::UsePackage - Update a package structure                  /*{{{*/
 237 // ---------------------------------------------------------------------
 238 /* This is called to update the package with any new information
 239    that might be found in the section */
 240 bool debListParser::UsePackage(pkgCache::PkgIterator &Pkg,
 241                                pkgCache::VerIterator &Ver)
 242 {
 243    if (Pkg->Section == 0)
 244       Pkg->Section = UniqFindTagWrite("Section");
 245
 246    string const static myArch = _config->Find("APT::Architecture");
 247    // Possible values are: "all", "native", "installed" and "none"
 248    // The "installed" mode is handled by ParseStatus(), See #544481 and friends.
 249    string const static essential = _config->Find("pkgCacheGen::Essential", "all");
 250    if (essential == "all" ||
 251        (essential == "native" && Pkg->Arch != 0 && myArch == Pkg.Arch()))
 252       if (Section.FindFlag("Essential",Pkg->Flags,pkgCache::Flag::Essential) == false)
 253          return false;
 254    if (Section.FindFlag("Important",Pkg->Flags,pkgCache::Flag::Important) == false)
 255       return false;
 256
 257    if (strcmp(Pkg.Name(),"apt") == 0)
 258    {
 259       if ((essential == "native" && Pkg->Arch != 0 && myArch == Pkg.Arch()) ||
 260           essential == "all")
 261          Pkg->Flags |= pkgCache::Flag::Essential | pkgCache::Flag::Important;
 262       else
 263          Pkg->Flags |= pkgCache::Flag::Important;
 264    }
 265
 266    if (ParseStatus(Pkg,Ver) == false)
 267       return false;
 268    return true;
 269 }
 270                                                                         /*}}}*/
 271 // ListParser::VersionHash - Compute a unique hash for this version     /*{{{*/
 272 // ---------------------------------------------------------------------
 273 /* */
 274 unsigned short debListParser::VersionHash()
 275 {
 276    const char *Sections[] ={"Installed-Size",
 277                             "Depends",
 278                             "Pre-Depends",
 279 //                            "Suggests",
 280 //                            "Recommends",
 281                             "Conflicts",
 282                             "Breaks",
 283                             "Replaces",0};
 284    unsigned long Result = INIT_FCS;
 285    char S[1024];
 286    for (const char **I = Sections; *I != 0; I++)
 287    {
 288       const char *Start;
 289       const char *End;
 290       if (Section.Find(*I,Start,End) == false || End - Start >= (signed)sizeof(S))
 291          continue;
 292
 293       /* Strip out any spaces from the text, this undoes dpkgs reformatting
 294          of certain fields. dpkg also has the rather interesting notion of
 295          reformatting depends operators < -> <= */
 296       char *J = S;
 297       for (; Start != End; Start++)
 298       {
 299          if (isspace(*Start) == 0)
 300             *J++ = tolower_ascii(*Start);
 301          if (*Start == '<' && Start[1] != '<' && Start[1] != '=')
 302             *J++ = '=';
 303          if (*Start == '>' && Start[1] != '>' && Start[1] != '=')
 304             *J++ = '=';
 305       }
 306
 307       Result = AddCRC16(Result,S,J - S);
 308    }
 309
 310    return Result;
 311 }
 312                                                                         /*}}}*/
 313 // ListParser::ParseStatus - Parse the status field                     /*{{{*/
 314 // ---------------------------------------------------------------------
 315 /* Status lines are of the form,
 316      Status: want flag status
 317    want = unknown, install, hold, deinstall, purge
 318    flag = ok, reinstreq, hold, hold-reinstreq
 319    status = not-installed, unpacked, half-configured,
 320             half-installed, config-files, post-inst-failed,
 321             removal-failed, installed
 322
 323    Some of the above are obsolete (I think?) flag = hold-* and
 324    status = post-inst-failed, removal-failed at least.
 325  */
 326 bool debListParser::ParseStatus(pkgCache::PkgIterator &Pkg,
 327                                 pkgCache::VerIterator &Ver)
 328 {
 329    const char *Start;
 330    const char *Stop;
 331    if (Section.Find("Status",Start,Stop) == false)
 332       return true;
 333
 334    // UsePackage() is responsible for setting the flag in the default case
 335    bool const static essential = _config->Find("pkgCacheGen::Essential", "") == "installed";
 336    if (essential == true &&
 337        Section.FindFlag("Essential",Pkg->Flags,pkgCache::Flag::Essential) == false)
 338       return false;
 339
 340    // Isolate the first word
 341    const char *I = Start;
 342    for(; I < Stop && *I != ' '; I++);
 343    if (I >= Stop || *I != ' ')
 344       return _error->Error("Malformed Status line");
 345
 346    // Process the want field
 347    WordList WantList[] = {{"unknown",pkgCache::State::Unknown},
 348                           {"install",pkgCache::State::Install},
 349                           {"hold",pkgCache::State::Hold},
 350                           {"deinstall",pkgCache::State::DeInstall},
 351                           {"purge",pkgCache::State::Purge},
 352                           {}};
 353    if (GrabWord(string(Start,I-Start),WantList,Pkg->SelectedState) == false)
 354       return _error->Error("Malformed 1st word in the Status line");
 355
 356    // Isloate the next word
 357    I++;
 358    Start = I;
 359    for(; I < Stop && *I != ' '; I++);
 360    if (I >= Stop || *I != ' ')
 361       return _error->Error("Malformed status line, no 2nd word");
 362
 363    // Process the flag field
 364    WordList FlagList[] = {{"ok",pkgCache::State::Ok},
 365                           {"reinstreq",pkgCache::State::ReInstReq},
 366                           {"hold",pkgCache::State::HoldInst},
 367                           {"hold-reinstreq",pkgCache::State::HoldReInstReq},
 368                           {}};
 369    if (GrabWord(string(Start,I-Start),FlagList,Pkg->InstState) == false)
 370       return _error->Error("Malformed 2nd word in the Status line");
 371
 372    // Isloate the last word
 373    I++;
 374    Start = I;
 375    for(; I < Stop && *I != ' '; I++);
 376    if (I != Stop)
 377       return _error->Error("Malformed Status line, no 3rd word");
 378
 379    // Process the flag field
 380    WordList StatusList[] = {{"not-installed",pkgCache::State::NotInstalled},
 381                             {"unpacked",pkgCache::State::UnPacked},
 382                             {"half-configured",pkgCache::State::HalfConfigured},
 383                             {"installed",pkgCache::State::Installed},
 384                             {"half-installed",pkgCache::State::HalfInstalled},
 385                             {"config-files",pkgCache::State::ConfigFiles},
 386                             {"triggers-awaited",pkgCache::State::TriggersAwaited},
 387                             {"triggers-pending",pkgCache::State::TriggersPending},
 388                             {"post-inst-failed",pkgCache::State::HalfConfigured},
 389                             {"removal-failed",pkgCache::State::HalfInstalled},
 390                             {}};
 391    if (GrabWord(string(Start,I-Start),StatusList,Pkg->CurrentState) == false)
 392       return _error->Error("Malformed 3rd word in the Status line");
 393
 394    /* A Status line marks the package as indicating the current
 395       version as well. Only if it is actually installed.. Otherwise
 396       the interesting dpkg handling of the status file creates bogus
 397       entries. */
 398    if (!(Pkg->CurrentState == pkgCache::State::NotInstalled ||
 399          Pkg->CurrentState == pkgCache::State::ConfigFiles))
 400    {
 401       if (Ver.end() == true)
 402          _error->Warning("Encountered status field in a non-version description");
 403       else
 404          Pkg->CurrentVer = Ver.Index();
 405    }
 406
 407    return true;
 408 }
 409
 410 const char *debListParser::ConvertRelation(const char *I,unsigned int &Op)
 411 {
 412    // Determine the operator
 413    switch (*I)
 414    {
 415       case '<':
 416       I++;
 417       if (*I == '=')
 418       {
 419          I++;
 420          Op = pkgCache::Dep::LessEq;
 421          break;
 422       }
 423
 424       if (*I == '<')
 425       {
 426          I++;
 427          Op = pkgCache::Dep::Less;
 428          break;
 429       }
 430
 431       // < is the same as <= and << is really Cs < for some reason
 432       Op = pkgCache::Dep::LessEq;
 433       break;
 434
 435       case '>':
 436       I++;
 437       if (*I == '=')
 438       {
 439          I++;
 440          Op = pkgCache::Dep::GreaterEq;
 441          break;
 442       }
 443
 444       if (*I == '>')
 445       {
 446          I++;
 447          Op = pkgCache::Dep::Greater;
 448          break;
 449       }
 450
 451       // > is the same as >= and >> is really Cs > for some reason
 452       Op = pkgCache::Dep::GreaterEq;
 453       break;
 454
 455       case '=':
 456       Op = pkgCache::Dep::Equals;
 457       I++;
 458       break;
 459
 460       // HACK around bad package definitions
 461       default:
 462       Op = pkgCache::Dep::Equals;
 463       break;
 464    }
 465    return I;
 466 }
 467                                                                         /*}}}*/
 468 // ListParser::ParseDepends - Parse a dependency element                /*{{{*/
 469 // ---------------------------------------------------------------------
 470 /* This parses the dependency elements out of a standard string in place,
 471    bit by bit. */
 472 const char *debListParser::ParseDepends(const char *Start,const char *Stop,
 473                                         string &Package,string &Ver,
 474                                         unsigned int &Op, bool const &ParseArchFlags,
 475                                         bool const &StripMultiArch)
 476 {
 477    // Strip off leading space
 478    for (;Start != Stop && isspace(*Start) != 0; Start++);
 479
 480    // Parse off the package name
 481    const char *I = Start;
 482    for (;I != Stop && isspace(*I) == 0 && *I != '(' && *I != ')' &&
 483         *I != ',' && *I != '|' && *I != '[' && *I != ']'; I++);
 484
 485    // Malformed, no '('
 486    if (I != Stop && *I == ')')
 487       return 0;
 488
 489    if (I == Start)
 490       return 0;
 491
 492    // Stash the package name
 493    Package.assign(Start,I - Start);
 494
 495    // We don't want to confuse library users which can't handle MultiArch
 496    string const arch = _config->Find("APT::Architecture");
 497    if (StripMultiArch == true) {
 498       size_t const found = Package.rfind(':');
 499       if (found != string::npos &&
 500           (strcmp(Package.c_str() + found, ":any") == 0 ||
 501            strcmp(Package.c_str() + found, ":native") == 0 ||
 502            strcmp(Package.c_str() + found + 1, arch.c_str()) == 0))
 503          Package = Package.substr(0,found);
 504    }
 505
 506    // Skip white space to the '('
 507    for (;I != Stop && isspace(*I) != 0 ; I++);
 508
 509    // Parse a version
 510    if (I != Stop && *I == '(')
 511    {
 512       // Skip the '('
 513       for (I++; I != Stop && isspace(*I) != 0 ; I++);
 514       if (I + 3 >= Stop)
 515          return 0;
 516       I = ConvertRelation(I,Op);
 517
 518       // Skip whitespace
 519       for (;I != Stop && isspace(*I) != 0; I++);
 520       Start = I;
 521       I = (const char*) memchr(I, ')', Stop - I);
 522       if (I == NULL || Start == I)
 523          return 0;
 524
 525       // Skip trailing whitespace
 526       const char *End = I;
 527       for (; End > Start && isspace(End[-1]); End--);
 528
 529       Ver.assign(Start,End-Start);
 530       I++;
 531    }
 532    else
 533    {
 534       Ver.clear();
 535       Op = pkgCache::Dep::NoOp;
 536    }
 537
 538    // Skip whitespace
 539    for (;I != Stop && isspace(*I) != 0; I++);
 540
 541    if (ParseArchFlags == true)
 542    {
 543       APT::CacheFilter::PackageArchitectureMatchesSpecification matchesArch(arch, false);
 544
 545       // Parse an architecture
 546       if (I != Stop && *I == '[')
 547       {
 548          ++I;
 549          // malformed
 550          if (unlikely(I == Stop))
 551             return 0;
 552
 553          const char *End = I;
 554          bool Found = false;
 555          bool NegArch = false;
 556          while (I != Stop)
 557          {
 558             // look for whitespace or ending ']'
 559             for (;End != Stop && !isspace(*End) && *End != ']'; ++End);
 560
 561             if (unlikely(End == Stop))
 562                return 0;
 563
 564             if (*I == '!')
 565             {
 566                NegArch = true;
 567                ++I;
 568             }
 569
 570             std::string arch(I, End);
 571             if (arch.empty() == false && matchesArch(arch.c_str()) == true)
 572             {
 573                Found = true;
 574                if (I[-1] != '!')
 575                   NegArch = false;
 576                // we found a match, so fast-forward to the end of the wildcards
 577                for (; End != Stop && *End != ']'; ++End);
 578             }
 579
 580             if (*End++ == ']') {
 581                I = End;
 582                break;
 583             }
 584
 585             I = End;
 586             for (;I != Stop && isspace(*I) != 0; I++);
 587          }
 588
 589          if (NegArch == true)
 590             Found = !Found;
 591
 592          if (Found == false)
 593             Package = ""; /* not for this arch */
 594       }
 595
 596       // Skip whitespace
 597       for (;I != Stop && isspace(*I) != 0; I++);
 598    }
 599
 600    if (I != Stop && *I == '|')
 601       Op |= pkgCache::Dep::Or;
 602
 603    if (I == Stop || *I == ',' || *I == '|')
 604    {
 605       if (I != Stop)
 606          for (I++; I != Stop && isspace(*I) != 0; I++);
 607       return I;
 608    }
 609
 610    return 0;
 611 }
 612                                                                         /*}}}*/
 613 // ListParser::ParseDepends - Parse a dependency list                   /*{{{*/
 614 // ---------------------------------------------------------------------
 615 /* This is the higher level depends parser. It takes a tag and generates
 616    a complete depends tree for the given version. */
 617 bool debListParser::ParseDepends(pkgCache::VerIterator &Ver,
 618                                  const char *Tag,unsigned int Type)
 619 {
 620    const char *Start;
 621    const char *Stop;
 622    if (Section.Find(Tag,Start,Stop) == false)
 623       return true;
 624
 625    string const pkgArch = Ver.Arch();
 626
 627    while (1)
 628    {
 629       string Package;
 630       string Version;
 631       unsigned int Op;
 632
 633       Start = ParseDepends(Start,Stop,Package,Version,Op,false,!MultiArchEnabled);
 634       if (Start == 0)
 635          return _error->Error("Problem parsing dependency %s",Tag);
 636       size_t const found = Package.rfind(':');
 637
 638       // If negative is unspecific it needs to apply on all architectures
 639       if (MultiArchEnabled == true && found == string::npos &&
 640           (Type == pkgCache::Dep::Conflicts ||
 641            Type == pkgCache::Dep::DpkgBreaks ||
 642            Type == pkgCache::Dep::Replaces))
 643       {
 644          for (std::vector<std::string>::const_iterator a = Architectures.begin();
 645               a != Architectures.end(); ++a)
 646             if (NewDepends(Ver,Package,*a,Version,Op,Type) == false)
 647                return false;
 648          if (NewDepends(Ver,Package,"none",Version,Op,Type) == false)
 649             return false;
 650       }
 651       else if (MultiArchEnabled == true && found != string::npos &&
 652                strcmp(Package.c_str() + found, ":any") != 0)
 653       {
 654          string Arch = Package.substr(found+1, string::npos);
 655          Package = Package.substr(0, found);
 656          // Such dependencies are not supposed to be accepted …
 657          // … but this is probably the best thing to do.
 658          if (Arch == "native")
 659             Arch = _config->Find("APT::Architecture");
 660          if (NewDepends(Ver,Package,Arch,Version,Op,Type) == false)
 661             return false;
 662       }
 663       else
 664       {
 665          if (NewDepends(Ver,Package,pkgArch,Version,Op,Type) == false)
 666             return false;
 667          if ((Type == pkgCache::Dep::Conflicts ||
 668               Type == pkgCache::Dep::DpkgBreaks ||
 669               Type == pkgCache::Dep::Replaces) &&
 670              NewDepends(Ver, Package,
 671                         (pkgArch != "none") ? "none" : _config->Find("APT::Architecture"),
 672                         Version,Op,Type) == false)
 673             return false;
 674       }
 675       if (Start == Stop)
 676          break;
 677    }
 678    return true;
 679 }
 680                                                                         /*}}}*/
 681 // ListParser::ParseProvides - Parse the provides list                  /*{{{*/
 682 // ---------------------------------------------------------------------
 683 /* */
 684 bool debListParser::ParseProvides(pkgCache::VerIterator &Ver)
 685 {
 686    const char *Start;
 687    const char *Stop;
 688    if (Section.Find("Provides",Start,Stop) == true)
 689    {
 690       string Package;
 691       string Version;
 692       string const Arch = Ver.Arch();
 693       unsigned int Op;
 694
 695       while (1)
 696       {
 697          Start = ParseDepends(Start,Stop,Package,Version,Op);
 698          if (Start == 0)
 699             return _error->Error("Problem parsing Provides line");
 700          if (Op != pkgCache::Dep::NoOp) {
 701             _error->Warning("Ignoring Provides line with DepCompareOp for package %s", Package.c_str());
 702          } else if ((Ver->MultiArch & pkgCache::Version::Foreign) == pkgCache::Version::Foreign) {
 703             if (NewProvidesAllArch(Ver, Package, Version) == false)
 704                return false;
 705          } else {
 706             if (NewProvides(Ver, Package, Arch, Version) == false)
 707                return false;
 708          }
 709
 710          if (Start == Stop)
 711             break;
 712       }
 713    }
 714
 715    if (MultiArchEnabled == false)
 716       return true;
 717    else if ((Ver->MultiArch & pkgCache::Version::Allowed) == pkgCache::Version::Allowed)
 718    {
 719       string const Package = string(Ver.ParentPkg().Name()).append(":").append("any");
 720       return NewProvidesAllArch(Ver, Package, Ver.VerStr());
 721    }
 722    else if ((Ver->MultiArch & pkgCache::Version::Foreign) == pkgCache::Version::Foreign)
 723       return NewProvidesAllArch(Ver, Ver.ParentPkg().Name(), Ver.VerStr());
 724
 725    return true;
 726 }
 727                                                                         /*}}}*/
 728 // ListParser::NewProvides - add provides for all architectures         /*{{{*/
 729 bool debListParser::NewProvidesAllArch(pkgCache::VerIterator &Ver, string const &Package,
 730                                 string const &Version) {
 731    for (std::vector<string>::const_iterator a = Architectures.begin();
 732         a != Architectures.end(); ++a)
 733    {
 734       if (NewProvides(Ver, Package, *a, Version) == false)
 735          return false;
 736    }
 737    return true;
 738 }
 739                                                                         /*}}}*/
 740 // ListParser::GrabWord - Matches a word and returns                    /*{{{*/
 741 // ---------------------------------------------------------------------
 742 /* Looks for a word in a list of words - for ParseStatus */
 743 bool debListParser::GrabWord(string Word,WordList *List,unsigned char &Out)
 744 {
 745    for (unsigned int C = 0; List[C].Str != 0; C++)
 746    {
 747       if (strcasecmp(Word.c_str(),List[C].Str) == 0)
 748       {
 749          Out = List[C].Val;
 750          return true;
 751       }
 752    }
 753    return false;
 754 }
 755                                                                         /*}}}*/
 756 // ListParser::Step - Move to the next section in the file              /*{{{*/
 757 // ---------------------------------------------------------------------
 758 /* This has to be carefull to only process the correct architecture */
 759 bool debListParser::Step()
 760 {
 761    iOffset = Tags.Offset();
 762    while (Tags.Step(Section) == true)
 763    {
 764       /* See if this is the correct Architecture, if it isn't then we
 765          drop the whole section. A missing arch tag only happens (in theory)
 766          inside the Status file, so that is a positive return */
 767       string const Architecture = Section.FindS("Architecture");
 768
 769       if (Arch.empty() == true || Arch == "any" || MultiArchEnabled == false)
 770       {
 771          if (APT::Configuration::checkArchitecture(Architecture) == true)
 772             return true;
 773          /* parse version stanzas without an architecture only in the status file
 774             (and as misfortune bycatch flat-archives) */
 775          if ((Arch.empty() == true || Arch == "any") && Architecture.empty() == true)
 776             return true;
 777       }
 778       else
 779       {
 780          if (Architecture == Arch)
 781             return true;
 782
 783          if (Architecture == "all" && Arch == _config->Find("APT::Architecture"))
 784             return true;
 785       }
 786
 787       iOffset = Tags.Offset();
 788    }
 789    return false;
 790 }
 791                                                                         /*}}}*/
 792 // ListParser::LoadReleaseInfo - Load the release information           /*{{{*/
 793 // ---------------------------------------------------------------------
 794 /* */
 795 bool debListParser::LoadReleaseInfo(pkgCache::PkgFileIterator &FileI,
 796                                     FileFd &File, string component)
 797 {
 798    // apt-secure does no longer download individual (per-section) Release
 799    // file. to provide Component pinning we use the section name now
 800    map_ptrloc const storage = WriteUniqString(component);
 801    FileI->Component = storage;
 802
 803    // FIXME: Code depends on the fact that Release files aren't compressed
 804    FILE* release = fdopen(dup(File.Fd()), "r");
 805    if (release == NULL)
 806       return false;
 807
 808    char buffer[101];
 809    bool gpgClose = false;
 810    while (fgets(buffer, sizeof(buffer), release) != NULL)
 811    {
 812       size_t len = 0;
 813
 814       // Skip empty lines
 815       for (; buffer[len] == '\r' && buffer[len] == '\n'; ++len)
 816          /* nothing */
 817          ;
 818       if (buffer[len] == '\0')
 819          continue;
 820
 821       // only evalute the first GPG section
 822       if (strncmp("-----", buffer, 5) == 0)
 823       {
 824          if (gpgClose == true)
 825             break;
 826          gpgClose = true;
 827          continue;
 828       }
 829
 830       // seperate the tag from the data
 831       const char* dataStart = strchr(buffer + len, ':');
 832       if (dataStart == NULL)
 833          continue;
 834       len = dataStart - buffer;
 835       for (++dataStart; *dataStart == ' '; ++dataStart)
 836          /* nothing */
 837          ;
 838       const char* dataEnd = (const char*)rawmemchr(dataStart, '\0');
 839       // The last char should be a newline, but we can never be sure: #633350
 840       const char* lineEnd = dataEnd;
 841       for (--lineEnd; *lineEnd == '\r' || *lineEnd == '\n'; --lineEnd)
 842          /* nothing */
 843          ;
 844       ++lineEnd;
 845
 846       // which datastorage need to be updated
 847       enum { Suite, Component, Version, Origin, Codename, Label, None } writeTo = None;
 848       if (buffer[0] == ' ')
 849          ;
 850       #define APT_PARSER_WRITETO(X) else if (strncmp(#X, buffer, len) == 0) writeTo = X;
 851       APT_PARSER_WRITETO(Suite)
 852       APT_PARSER_WRITETO(Component)
 853       APT_PARSER_WRITETO(Version)
 854       APT_PARSER_WRITETO(Origin)
 855       APT_PARSER_WRITETO(Codename)
 856       APT_PARSER_WRITETO(Label)
 857       #undef APT_PARSER_WRITETO
 858       #define APT_PARSER_FLAGIT(X) else if (strncmp(#X, buffer, len) == 0) \
 859          pkgTagSection::FindFlag(FileI->Flags, pkgCache::Flag:: X, dataStart, lineEnd);
 860       APT_PARSER_FLAGIT(NotAutomatic)
 861       APT_PARSER_FLAGIT(ButAutomaticUpgrades)
 862       #undef APT_PARSER_FLAGIT
 863
 864       // load all data from the line and save it
 865       string data;
 866       if (writeTo != None)
 867          data.append(dataStart, dataEnd);
 868       if (sizeof(buffer) - 1 == (dataEnd - buffer))
 869       {
 870          while (fgets(buffer, sizeof(buffer), release) != NULL)
 871          {
 872             if (writeTo != None)
 873                data.append(buffer);
 874             if (strlen(buffer) != sizeof(buffer) - 1)
 875                break;
 876          }
 877       }
 878       if (writeTo != None)
 879       {
 880          // remove spaces and stuff from the end of the data line
 881          for (std::string::reverse_iterator s = data.rbegin();
 882               s != data.rend(); ++s)
 883          {
 884             if (*s != '\r' && *s != '\n' && *s != ' ')
 885                break;
 886             *s = '\0';
 887          }
 888          map_ptrloc const storage = WriteUniqString(data);
 889          switch (writeTo) {
 890          case Suite: FileI->Archive = storage; break;
 891          case Component: FileI->Component = storage; break;
 892          case Version: FileI->Version = storage; break;
 893          case Origin: FileI->Origin = storage; break;
 894          case Codename: FileI->Codename = storage; break;
 895          case Label: FileI->Label = storage; break;
 896          case None: break;
 897          }
 898       }
 899    }
 900    fclose(release);
 901
 902    return !_error->PendingError();
 903 }
 904                                                                         /*}}}*/
 905 // ListParser::GetPrio - Convert the priority from a string             /*{{{*/
 906 // ---------------------------------------------------------------------
 907 /* */
 908 unsigned char debListParser::GetPrio(string Str)
 909 {
 910    unsigned char Out;
 911    if (GrabWord(Str,PrioList,Out) == false)
 912       Out = pkgCache::State::Extra;
 913
 914    return Out;
 915 }
 916                                                                         /*}}}*/