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/aptconfiguration.h>
  19 #include <apt-pkg/strutl.h>
  20 #include <apt-pkg/fileutl.h>
  21 #include <apt-pkg/crc-16.h>
  22 #include <apt-pkg/md5.h>
  23 #include <apt-pkg/macros.h>
  24
  25 #include <fnmatch.h>
  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 value = Section.FindS("Description-md5");
 219
 220    if (value.empty())
 221    {
 222       MD5Summation md5;
 223       md5.Add((Description() + "\n").c_str());
 224       return md5.Result();
 225    } else
 226       return MD5SumValue(value);
 227 }
 228                                                                         /*}}}*/
 229 // ListParser::UsePackage - Update a package structure                  /*{{{*/
 230 // ---------------------------------------------------------------------
 231 /* This is called to update the package with any new information
 232    that might be found in the section */
 233 bool debListParser::UsePackage(pkgCache::PkgIterator &Pkg,
 234                                pkgCache::VerIterator &Ver)
 235 {
 236    if (Pkg->Section == 0)
 237       Pkg->Section = UniqFindTagWrite("Section");
 238
 239    // Packages which are not from the "native" arch doesn't get the essential flag
 240    // in the default "native" mode - it is also possible to mark "all" or "none".
 241    // The "installed" mode is handled by ParseStatus(), See #544481 and friends.
 242    string const static myArch = _config->Find("APT::Architecture");
 243    string const static essential = _config->Find("pkgCacheGen::Essential", "native");
 244    if ((essential == "native" && Pkg->Arch != 0 && myArch == Pkg.Arch()) ||
 245        essential == "all")
 246       if (Section.FindFlag("Essential",Pkg->Flags,pkgCache::Flag::Essential) == false)
 247          return false;
 248    if (Section.FindFlag("Important",Pkg->Flags,pkgCache::Flag::Important) == false)
 249       return false;
 250
 251    if (strcmp(Pkg.Name(),"apt") == 0)
 252       Pkg->Flags |= pkgCache::Flag::Important;
 253
 254    if (ParseStatus(Pkg,Ver) == false)
 255       return false;
 256    return true;
 257 }
 258                                                                         /*}}}*/
 259 // ListParser::VersionHash - Compute a unique hash for this version     /*{{{*/
 260 // ---------------------------------------------------------------------
 261 /* */
 262 unsigned short debListParser::VersionHash()
 263 {
 264    const char *Sections[] ={"Installed-Size",
 265                             "Depends",
 266                             "Pre-Depends",
 267 //                            "Suggests",
 268 //                            "Recommends",
 269                             "Conflicts",
 270                             "Breaks",
 271                             "Replaces",0};
 272    unsigned long Result = INIT_FCS;
 273    char S[1024];
 274    for (const char **I = Sections; *I != 0; I++)
 275    {
 276       const char *Start;
 277       const char *End;
 278       if (Section.Find(*I,Start,End) == false || End - Start >= (signed)sizeof(S))
 279          continue;
 280
 281       /* Strip out any spaces from the text, this undoes dpkgs reformatting
 282          of certain fields. dpkg also has the rather interesting notion of
 283          reformatting depends operators < -> <= */
 284       char *J = S;
 285       for (; Start != End; Start++)
 286       {
 287          if (isspace(*Start) == 0)
 288             *J++ = tolower_ascii(*Start);
 289          if (*Start == '<' && Start[1] != '<' && Start[1] != '=')
 290             *J++ = '=';
 291          if (*Start == '>' && Start[1] != '>' && Start[1] != '=')
 292             *J++ = '=';
 293       }
 294
 295       Result = AddCRC16(Result,S,J - S);
 296    }
 297
 298    return Result;
 299 }
 300                                                                         /*}}}*/
 301 // ListParser::ParseStatus - Parse the status field                     /*{{{*/
 302 // ---------------------------------------------------------------------
 303 /* Status lines are of the form,
 304      Status: want flag status
 305    want = unknown, install, hold, deinstall, purge
 306    flag = ok, reinstreq, hold, hold-reinstreq
 307    status = not-installed, unpacked, half-configured,
 308             half-installed, config-files, post-inst-failed,
 309             removal-failed, installed
 310
 311    Some of the above are obsolete (I think?) flag = hold-* and
 312    status = post-inst-failed, removal-failed at least.
 313  */
 314 bool debListParser::ParseStatus(pkgCache::PkgIterator &Pkg,
 315                                 pkgCache::VerIterator &Ver)
 316 {
 317    const char *Start;
 318    const char *Stop;
 319    if (Section.Find("Status",Start,Stop) == false)
 320       return true;
 321
 322    // UsePackage() is responsible for setting the flag in the default case
 323    bool const static essential = _config->Find("pkgCacheGen::Essential", "") == "installed";
 324    if (essential == true &&
 325        Section.FindFlag("Essential",Pkg->Flags,pkgCache::Flag::Essential) == false)
 326       return false;
 327
 328    // Isolate the first word
 329    const char *I = Start;
 330    for(; I < Stop && *I != ' '; I++);
 331    if (I >= Stop || *I != ' ')
 332       return _error->Error("Malformed Status line");
 333
 334    // Process the want field
 335    WordList WantList[] = {{"unknown",pkgCache::State::Unknown},
 336                           {"install",pkgCache::State::Install},
 337                           {"hold",pkgCache::State::Hold},
 338                           {"deinstall",pkgCache::State::DeInstall},
 339                           {"purge",pkgCache::State::Purge},
 340                           {}};
 341    if (GrabWord(string(Start,I-Start),WantList,Pkg->SelectedState) == false)
 342       return _error->Error("Malformed 1st word in the Status line");
 343
 344    // Isloate the next word
 345    I++;
 346    Start = I;
 347    for(; I < Stop && *I != ' '; I++);
 348    if (I >= Stop || *I != ' ')
 349       return _error->Error("Malformed status line, no 2nd word");
 350
 351    // Process the flag field
 352    WordList FlagList[] = {{"ok",pkgCache::State::Ok},
 353                           {"reinstreq",pkgCache::State::ReInstReq},
 354                           {"hold",pkgCache::State::HoldInst},
 355                           {"hold-reinstreq",pkgCache::State::HoldReInstReq},
 356                           {}};
 357    if (GrabWord(string(Start,I-Start),FlagList,Pkg->InstState) == false)
 358       return _error->Error("Malformed 2nd word in the Status line");
 359
 360    // Isloate the last word
 361    I++;
 362    Start = I;
 363    for(; I < Stop && *I != ' '; I++);
 364    if (I != Stop)
 365       return _error->Error("Malformed Status line, no 3rd word");
 366
 367    // Process the flag field
 368    WordList StatusList[] = {{"not-installed",pkgCache::State::NotInstalled},
 369                             {"unpacked",pkgCache::State::UnPacked},
 370                             {"half-configured",pkgCache::State::HalfConfigured},
 371                             {"installed",pkgCache::State::Installed},
 372                             {"half-installed",pkgCache::State::HalfInstalled},
 373                             {"config-files",pkgCache::State::ConfigFiles},
 374                             {"triggers-awaited",pkgCache::State::TriggersAwaited},
 375                             {"triggers-pending",pkgCache::State::TriggersPending},
 376                             {"post-inst-failed",pkgCache::State::HalfConfigured},
 377                             {"removal-failed",pkgCache::State::HalfInstalled},
 378                             {}};
 379    if (GrabWord(string(Start,I-Start),StatusList,Pkg->CurrentState) == false)
 380       return _error->Error("Malformed 3rd word in the Status line");
 381
 382    /* A Status line marks the package as indicating the current
 383       version as well. Only if it is actually installed.. Otherwise
 384       the interesting dpkg handling of the status file creates bogus
 385       entries. */
 386    if (!(Pkg->CurrentState == pkgCache::State::NotInstalled ||
 387          Pkg->CurrentState == pkgCache::State::ConfigFiles))
 388    {
 389       if (Ver.end() == true)
 390          _error->Warning("Encountered status field in a non-version description");
 391       else
 392          Pkg->CurrentVer = Ver.Index();
 393    }
 394
 395    return true;
 396 }
 397
 398 const char *debListParser::ConvertRelation(const char *I,unsigned int &Op)
 399 {
 400    // Determine the operator
 401    switch (*I)
 402    {
 403       case '<':
 404       I++;
 405       if (*I == '=')
 406       {
 407          I++;
 408          Op = pkgCache::Dep::LessEq;
 409          break;
 410       }
 411
 412       if (*I == '<')
 413       {
 414          I++;
 415          Op = pkgCache::Dep::Less;
 416          break;
 417       }
 418
 419       // < is the same as <= and << is really Cs < for some reason
 420       Op = pkgCache::Dep::LessEq;
 421       break;
 422
 423       case '>':
 424       I++;
 425       if (*I == '=')
 426       {
 427          I++;
 428          Op = pkgCache::Dep::GreaterEq;
 429          break;
 430       }
 431
 432       if (*I == '>')
 433       {
 434          I++;
 435          Op = pkgCache::Dep::Greater;
 436          break;
 437       }
 438
 439       // > is the same as >= and >> is really Cs > for some reason
 440       Op = pkgCache::Dep::GreaterEq;
 441       break;
 442
 443       case '=':
 444       Op = pkgCache::Dep::Equals;
 445       I++;
 446       break;
 447
 448       // HACK around bad package definitions
 449       default:
 450       Op = pkgCache::Dep::Equals;
 451       break;
 452    }
 453    return I;
 454 }
 455
 456 /*
 457  * CompleteArch:
 458  *
 459  * The complete architecture, consisting of <kernel>-<cpu>.
 460  */
 461 static string CompleteArch(std::string const &arch) {
 462     if (arch == "armel")              return "linux-arm";
 463     if (arch == "armhf")              return "linux-arm";
 464     if (arch == "lpia")               return "linux-i386";
 465     if (arch == "powerpcspe")         return "linux-powerpc";
 466     if (arch == "uclibc-linux-armel") return "linux-arm";
 467     if (arch == "uclinux-armel")      return "uclinux-arm";
 468
 469     return (arch.find("-") != string::npos) ? arch : "linux-" + arch;
 470 }
 471                                                                         /*}}}*/
 472 // ListParser::ParseDepends - Parse a dependency element                /*{{{*/
 473 // ---------------------------------------------------------------------
 474 /* This parses the dependency elements out of a standard string in place,
 475    bit by bit. */
 476 const char *debListParser::ParseDepends(const char *Start,const char *Stop,
 477                                         string &Package,string &Ver,
 478                                         unsigned int &Op, bool const &ParseArchFlags,
 479                                         bool const &StripMultiArch)
 480 {
 481    // Strip off leading space
 482    for (;Start != Stop && isspace(*Start) != 0; Start++);
 483
 484    // Parse off the package name
 485    const char *I = Start;
 486    for (;I != Stop && isspace(*I) == 0 && *I != '(' && *I != ')' &&
 487         *I != ',' && *I != '|' && *I != '[' && *I != ']'; I++);
 488
 489    // Malformed, no '('
 490    if (I != Stop && *I == ')')
 491       return 0;
 492
 493    if (I == Start)
 494       return 0;
 495
 496    // Stash the package name
 497    Package.assign(Start,I - Start);
 498
 499    // We don't want to confuse library users which can't handle MultiArch
 500    string const arch = _config->Find("APT::Architecture");
 501    if (StripMultiArch == true) {
 502       size_t const found = Package.rfind(':');
 503       if (found != string::npos &&
 504           (strcmp(Package.c_str() + found, ":any") == 0 ||
 505            strcmp(Package.c_str() + found, ":native") == 0 ||
 506            strcmp(Package.c_str() + found + 1, arch.c_str()) == 0))
 507          Package = Package.substr(0,found);
 508    }
 509
 510    // Skip white space to the '('
 511    for (;I != Stop && isspace(*I) != 0 ; I++);
 512
 513    // Parse a version
 514    if (I != Stop && *I == '(')
 515    {
 516       // Skip the '('
 517       for (I++; I != Stop && isspace(*I) != 0 ; I++);
 518       if (I + 3 >= Stop)
 519          return 0;
 520       I = ConvertRelation(I,Op);
 521
 522       // Skip whitespace
 523       for (;I != Stop && isspace(*I) != 0; I++);
 524       Start = I;
 525       I = (const char*) memchr(I, ')', Stop - I);
 526       if (I == NULL || Start == I)
 527          return 0;
 528
 529       // Skip trailing whitespace
 530       const char *End = I;
 531       for (; End > Start && isspace(End[-1]); End--);
 532
 533       Ver.assign(Start,End-Start);
 534       I++;
 535    }
 536    else
 537    {
 538       Ver.clear();
 539       Op = pkgCache::Dep::NoOp;
 540    }
 541
 542    // Skip whitespace
 543    for (;I != Stop && isspace(*I) != 0; I++);
 544
 545    if (ParseArchFlags == true)
 546    {
 547       string completeArch = CompleteArch(arch);
 548
 549       // Parse an architecture
 550       if (I != Stop && *I == '[')
 551       {
 552          // malformed
 553          I++;
 554          if (I == Stop)
 555             return 0;
 556
 557          const char *End = I;
 558          bool Found = false;
 559          bool NegArch = false;
 560          while (I != Stop)
 561          {
 562             // look for whitespace or ending ']'
 563             while (End != Stop && !isspace(*End) && *End != ']')
 564                End++;
 565
 566             if (End == Stop)
 567                return 0;
 568
 569             if (*I == '!')
 570             {
 571                NegArch = true;
 572                I++;
 573             }
 574
 575             if (stringcmp(arch,I,End) == 0) {
 576                Found = true;
 577             } else {
 578                std::string wildcard = SubstVar(string(I, End), "any", "*");
 579                if (fnmatch(wildcard.c_str(), completeArch.c_str(), 0) == 0)
 580                   Found = true;
 581             }
 582
 583             if (*End++ == ']') {
 584                I = End;
 585                break;
 586             }
 587
 588             I = End;
 589             for (;I != Stop && isspace(*I) != 0; I++);
 590          }
 591
 592          if (NegArch)
 593             Found = !Found;
 594
 595          if (Found == false)
 596             Package = ""; /* not for this arch */
 597       }
 598
 599       // Skip whitespace
 600       for (;I != Stop && isspace(*I) != 0; I++);
 601    }
 602
 603    if (I != Stop && *I == '|')
 604       Op |= pkgCache::Dep::Or;
 605
 606    if (I == Stop || *I == ',' || *I == '|')
 607    {
 608       if (I != Stop)
 609          for (I++; I != Stop && isspace(*I) != 0; I++);
 610       return I;
 611    }
 612
 613    return 0;
 614 }
 615                                                                         /*}}}*/
 616 // ListParser::ParseDepends - Parse a dependency list                   /*{{{*/
 617 // ---------------------------------------------------------------------
 618 /* This is the higher level depends parser. It takes a tag and generates
 619    a complete depends tree for the given version. */
 620 bool debListParser::ParseDepends(pkgCache::VerIterator &Ver,
 621                                  const char *Tag,unsigned int Type)
 622 {
 623    const char *Start;
 624    const char *Stop;
 625    if (Section.Find(Tag,Start,Stop) == false)
 626       return true;
 627
 628    string Package;
 629    string const pkgArch = Ver.Arch();
 630    string Version;
 631    unsigned int Op;
 632
 633    while (1)
 634    {
 635       Start = ParseDepends(Start,Stop,Package,Version,Op,false,!MultiArchEnabled);
 636       if (Start == 0)
 637          return _error->Error("Problem parsing dependency %s",Tag);
 638
 639       if (MultiArchEnabled == true &&
 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       }
 649       else if (NewDepends(Ver,Package,pkgArch,Version,Op,Type) == false)
 650          return false;
 651       if (Start == Stop)
 652          break;
 653    }
 654    return true;
 655 }
 656                                                                         /*}}}*/
 657 // ListParser::ParseProvides - Parse the provides list                  /*{{{*/
 658 // ---------------------------------------------------------------------
 659 /* */
 660 bool debListParser::ParseProvides(pkgCache::VerIterator &Ver)
 661 {
 662    const char *Start;
 663    const char *Stop;
 664    if (Section.Find("Provides",Start,Stop) == true)
 665    {
 666       string Package;
 667       string Version;
 668       string const Arch = Ver.Arch();
 669       unsigned int Op;
 670
 671       while (1)
 672       {
 673          Start = ParseDepends(Start,Stop,Package,Version,Op);
 674          if (Start == 0)
 675             return _error->Error("Problem parsing Provides line");
 676          if (Op != pkgCache::Dep::NoOp) {
 677             _error->Warning("Ignoring Provides line with DepCompareOp for package %s", Package.c_str());
 678          } else if ((Ver->MultiArch & pkgCache::Version::Foreign) == pkgCache::Version::Foreign) {
 679             if (NewProvidesAllArch(Ver, Package, Version) == false)
 680                return false;
 681          } else {
 682             if (NewProvides(Ver, Package, Arch, Version) == false)
 683                return false;
 684          }
 685
 686          if (Start == Stop)
 687             break;
 688       }
 689    }
 690
 691    if (MultiArchEnabled == false)
 692       return true;
 693    else if ((Ver->MultiArch & pkgCache::Version::Allowed) == pkgCache::Version::Allowed)
 694    {
 695       string const Package = string(Ver.ParentPkg().Name()).append(":").append("any");
 696       return NewProvidesAllArch(Ver, Package, Ver.VerStr());
 697    }
 698    else if ((Ver->MultiArch & pkgCache::Version::Foreign) == pkgCache::Version::Foreign)
 699       return NewProvidesAllArch(Ver, Ver.ParentPkg().Name(), Ver.VerStr());
 700
 701    return true;
 702 }
 703                                                                         /*}}}*/
 704 // ListParser::NewProvides - add provides for all architectures         /*{{{*/
 705 bool debListParser::NewProvidesAllArch(pkgCache::VerIterator &Ver, string const &Package,
 706                                 string const &Version) {
 707    for (std::vector<string>::const_iterator a = Architectures.begin();
 708         a != Architectures.end(); ++a)
 709    {
 710       if (NewProvides(Ver, Package, *a, Version) == false)
 711          return false;
 712    }
 713    return true;
 714 }
 715                                                                         /*}}}*/
 716 // ListParser::GrabWord - Matches a word and returns                    /*{{{*/
 717 // ---------------------------------------------------------------------
 718 /* Looks for a word in a list of words - for ParseStatus */
 719 bool debListParser::GrabWord(string Word,WordList *List,unsigned char &Out)
 720 {
 721    for (unsigned int C = 0; List[C].Str != 0; C++)
 722    {
 723       if (strcasecmp(Word.c_str(),List[C].Str) == 0)
 724       {
 725          Out = List[C].Val;
 726          return true;
 727       }
 728    }
 729    return false;
 730 }
 731                                                                         /*}}}*/
 732 // ListParser::Step - Move to the next section in the file              /*{{{*/
 733 // ---------------------------------------------------------------------
 734 /* This has to be carefull to only process the correct architecture */
 735 bool debListParser::Step()
 736 {
 737    iOffset = Tags.Offset();
 738    while (Tags.Step(Section) == true)
 739    {
 740       /* See if this is the correct Architecture, if it isn't then we
 741          drop the whole section. A missing arch tag only happens (in theory)
 742          inside the Status file, so that is a positive return */
 743       string const Architecture = Section.FindS("Architecture");
 744       if (Architecture.empty() == true)
 745          return true;
 746
 747       if (Arch.empty() == true || Arch == "any" || MultiArchEnabled == false)
 748       {
 749          if (APT::Configuration::checkArchitecture(Architecture) == true)
 750             return true;
 751       }
 752       else
 753       {
 754          if (Architecture == Arch)
 755             return true;
 756
 757          if (Architecture == "all" && Arch == _config->Find("APT::Architecture"))
 758             return true;
 759       }
 760
 761       iOffset = Tags.Offset();
 762    }
 763    return false;
 764 }
 765                                                                         /*}}}*/
 766 // ListParser::LoadReleaseInfo - Load the release information           /*{{{*/
 767 // ---------------------------------------------------------------------
 768 /* */
 769 bool debListParser::LoadReleaseInfo(pkgCache::PkgFileIterator &FileI,
 770                                     FileFd &File, string component)
 771 {
 772    // apt-secure does no longer download individual (per-section) Release
 773    // file. to provide Component pinning we use the section name now
 774    FileI->Component = WriteUniqString(component);
 775
 776    FILE* release = fdopen(dup(File.Fd()), "r");
 777    if (release == NULL)
 778       return false;
 779
 780    char buffer[101];
 781    bool gpgClose = false;
 782    while (fgets(buffer, sizeof(buffer), release) != NULL)
 783    {
 784       size_t len = 0;
 785
 786       // Skip empty lines
 787       for (; buffer[len] == '\r' && buffer[len] == '\n'; ++len)
 788          /* nothing */
 789          ;
 790       if (buffer[len] == '\0')
 791          continue;
 792
 793       // only evalute the first GPG section
 794       if (strncmp("-----", buffer, 5) == 0)
 795       {
 796          if (gpgClose == true)
 797             break;
 798          gpgClose = true;
 799          continue;
 800       }
 801
 802       // seperate the tag from the data
 803       const char* dataStart = strchr(buffer + len, ':');
 804       if (dataStart == NULL)
 805          continue;
 806       len = dataStart - buffer;
 807       for (++dataStart; *dataStart == ' '; ++dataStart)
 808          /* nothing */
 809          ;
 810       const char* dataEnd = (const char*)rawmemchr(dataStart, '\0');
 811       // The last char should be a newline, but we can never be sure: #633350
 812       const char* lineEnd = dataEnd;
 813       for (--lineEnd; *lineEnd == '\r' || *lineEnd == '\n'; --lineEnd)
 814          /* nothing */
 815          ;
 816       ++lineEnd;
 817
 818       // which datastorage need to be updated
 819       enum { Suite, Component, Version, Origin, Codename, Label, None } writeTo = None;
 820       if (buffer[0] == ' ')
 821          ;
 822       #define APT_PARSER_WRITETO(X) else if (strncmp(#X, buffer, len) == 0) writeTo = X;
 823       APT_PARSER_WRITETO(Suite)
 824       APT_PARSER_WRITETO(Component)
 825       APT_PARSER_WRITETO(Version)
 826       APT_PARSER_WRITETO(Origin)
 827       APT_PARSER_WRITETO(Codename)
 828       APT_PARSER_WRITETO(Label)
 829       #undef APT_PARSER_WRITETO
 830       #define APT_PARSER_FLAGIT(X) else if (strncmp(#X, buffer, len) == 0) \
 831          pkgTagSection::FindFlag(FileI->Flags, pkgCache::Flag:: X, dataStart, lineEnd);
 832       APT_PARSER_FLAGIT(NotAutomatic)
 833       APT_PARSER_FLAGIT(ButAutomaticUpgrades)
 834       #undef APT_PARSER_FLAGIT
 835
 836       // load all data from the line and save it
 837       string data;
 838       if (writeTo != None)
 839          data.append(dataStart, dataEnd);
 840       if (sizeof(buffer) - 1 == (dataEnd - buffer))
 841       {
 842          while (fgets(buffer, sizeof(buffer), release) != NULL)
 843          {
 844             if (writeTo != None)
 845                data.append(buffer);
 846             if (strlen(buffer) != sizeof(buffer) - 1)
 847                break;
 848          }
 849       }
 850       if (writeTo != None)
 851       {
 852          // remove spaces and stuff from the end of the data line
 853          for (std::string::reverse_iterator s = data.rbegin();
 854               s != data.rend(); ++s)
 855          {
 856             if (*s != '\r' && *s != '\n' && *s != ' ')
 857                break;
 858             *s = '\0';
 859          }
 860          switch (writeTo) {
 861          case Suite: FileI->Archive = WriteUniqString(data); break;
 862          case Component: FileI->Component = WriteUniqString(data); break;
 863          case Version: FileI->Version = WriteUniqString(data); break;
 864          case Origin: FileI->Origin = WriteUniqString(data); break;
 865          case Codename: FileI->Codename = WriteUniqString(data); break;
 866          case Label: FileI->Label = WriteUniqString(data); break;
 867          case None: break;
 868          }
 869       }
 870    }
 871    fclose(release);
 872
 873    return !_error->PendingError();
 874 }
 875                                                                         /*}}}*/
 876 // ListParser::GetPrio - Convert the priority from a string             /*{{{*/
 877 // ---------------------------------------------------------------------
 878 /* */
 879 unsigned char debListParser::GetPrio(string Str)
 880 {
 881    unsigned char Out;
 882    if (GrabWord(Str,PrioList,Out) == false)
 883       Out = pkgCache::State::Extra;
 884
 885    return Out;
 886 }
 887                                                                         /*}}}*/