apt-pkg/deb/deblistparser.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: deblistparser.cc,v 1.13 1998/12/14 08:07:29 jgg 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 <apt-pkg/deblistparser.h>
  14 #include <apt-pkg/error.h>
  15 #include <apt-pkg/configuration.h>
  16 #include <strutl.h>
  17
  18 #include <system.h>
  19                                                                         /*}}}*/
  20
  21 // ListParser::debListParser - Constructor                              /*{{{*/
  22 // ---------------------------------------------------------------------
  23 /* */
  24 debListParser::debListParser(FileFd &File) : Tags(File)
  25 {
  26 }
  27                                                                         /*}}}*/
  28 // ListParser::UniqFindTagWrite - Find the tag and write a unq string   /*{{{*/
  29 // ---------------------------------------------------------------------
  30 /* */
  31 unsigned long debListParser::UniqFindTagWrite(const char *Tag)
  32 {
  33    const char *Start;
  34    const char *Stop;
  35    if (Section.Find(Tag,Start,Stop) == false)
  36       return 0;
  37    return WriteUniqString(Start,Stop - Start);
  38 }
  39                                                                         /*}}}*/
  40 // ListParser::Package - Return the package name                        /*{{{*/
  41 // ---------------------------------------------------------------------
  42 /* This is to return the name of the package this section describes */
  43 string debListParser::Package()
  44 {
  45    string Result = Section.FindS("Package");
  46    if (Result.empty() == true)
  47       _error->Error("Encoutered a section with no Package: header");
  48    return Result;
  49 }
  50                                                                         /*}}}*/
  51 // ListParser::Version - Return the version string                      /*{{{*/
  52 // ---------------------------------------------------------------------
  53 /* This is to return the string describing the version in debian form,
  54    epoch:upstream-release. If this returns the blank string then the
  55    entry is assumed to only describe package properties */
  56 string debListParser::Version()
  57 {
  58    return Section.FindS("Version");
  59 }
  60                                                                         /*}}}*/
  61 // ListParser::NewVersion - Fill in the version structure               /*{{{*/
  62 // ---------------------------------------------------------------------
  63 /* */
  64 bool debListParser::NewVersion(pkgCache::VerIterator Ver)
  65 {
  66    // Parse the section
  67    Ver->Section = UniqFindTagWrite("Section");
  68
  69    // Archive Size
  70    Ver->Size = (unsigned)Section.FindI("Size");
  71
  72    // Unpacked Size (in K)
  73    Ver->InstalledSize = (unsigned)Section.FindI("Installed-Size");
  74    Ver->InstalledSize *= 1024;
  75
  76    // Priority
  77    const char *Start;
  78    const char *Stop;
  79    if (Section.Find("Priority",Start,Stop) == true)
  80    {
  81       WordList PrioList[] = {{"important",pkgCache::State::Important},
  82                              {"required",pkgCache::State::Required},
  83                              {"standard",pkgCache::State::Standard},
  84                              {"optional",pkgCache::State::Optional},
  85                              {"extra",pkgCache::State::Extra}};
  86       if (GrabWord(string(Start,Stop-Start),PrioList,
  87                    _count(PrioList),Ver->Priority) == false)
  88          return _error->Error("Malformed Priority line");
  89    }
  90
  91    if (ParseDepends(Ver,"Depends",pkgCache::Dep::Depends) == false)
  92       return false;
  93    if (ParseDepends(Ver,"Pre-Depends",pkgCache::Dep::PreDepends) == false)
  94       return false;
  95    if (ParseDepends(Ver,"Suggests",pkgCache::Dep::Suggests) == false)
  96       return false;
  97    if (ParseDepends(Ver,"Recommends",pkgCache::Dep::Recommends) == false)
  98       return false;
  99    if (ParseDepends(Ver,"Conflicts",pkgCache::Dep::Conflicts) == false)
 100       return false;
 101    if (ParseDepends(Ver,"Replaces",pkgCache::Dep::Replaces) == false)
 102       return false;
 103
 104    if (ParseProvides(Ver) == false)
 105       return false;
 106
 107    return true;
 108 }
 109                                                                         /*}}}*/
 110 // ListParser::UsePackage - Update a package structure                  /*{{{*/
 111 // ---------------------------------------------------------------------
 112 /* This is called to update the package with any new information
 113    that might be found in the section */
 114 bool debListParser::UsePackage(pkgCache::PkgIterator Pkg,
 115                                pkgCache::VerIterator Ver)
 116 {
 117    if (Pkg->Section == 0)
 118       Pkg->Section = UniqFindTagWrite("Section");
 119    if (Section.FindFlag("Essential",Pkg->Flags,pkgCache::Flag::Essential) == false)
 120       return false;
 121    if (Section.FindFlag("Immediate-Configure",Pkg->Flags,pkgCache::Flag::ImmediateConf) == false)
 122       return false;
 123    if (ParseStatus(Pkg,Ver) == false)
 124       return false;
 125    return true;
 126 }
 127                                                                         /*}}}*/
 128 // ListParser::ParseStatus - Parse the status field                     /*{{{*/
 129 // ---------------------------------------------------------------------
 130 /* Status lines are of the form,
 131      Status: want flag status
 132    want = unknown, install, hold, deinstall, purge
 133    flag = ok, reinstreq, hold, hold-reinstreq
 134    status = not-installed, unpacked, half-configured, uninstalled,
 135             half-installed, config-files, post-inst-failed,
 136             removal-failed, installed
 137
 138    Some of the above are obsolete (I think?) flag = hold-* and
 139    status = post-inst-failed, removal-failed at least.
 140  */
 141 bool debListParser::ParseStatus(pkgCache::PkgIterator Pkg,
 142                                 pkgCache::VerIterator Ver)
 143 {
 144    const char *Start;
 145    const char *Stop;
 146    if (Section.Find("Status",Start,Stop) == false)
 147       return true;
 148
 149    // Isolate the first word
 150    const char *I = Start;
 151    for(; I < Stop && *I != ' '; I++);
 152    if (I >= Stop || *I != ' ')
 153       return _error->Error("Malformed Status line");
 154
 155    // Process the want field
 156    WordList WantList[] = {{"unknown",pkgCache::State::Unknown},
 157                           {"install",pkgCache::State::Install},
 158                           {"hold",pkgCache::State::Hold},
 159                           {"deinstall",pkgCache::State::DeInstall},
 160                           {"purge",pkgCache::State::Purge}};
 161    if (GrabWord(string(Start,I-Start),WantList,
 162                 _count(WantList),Pkg->SelectedState) == false)
 163       return _error->Error("Malformed 1st word in the Status line");
 164
 165    // Isloate the next word
 166    I++;
 167    Start = I;
 168    for(; I < Stop && *I != ' '; I++);
 169    if (I >= Stop || *I != ' ')
 170       return _error->Error("Malformed status line, no 2nd word");
 171
 172    // Process the flag field
 173    WordList FlagList[] = {{"ok",pkgCache::State::Ok},
 174                           {"reinstreq",pkgCache::State::ReInstReq},
 175                           {"hold",pkgCache::State::HoldInst},
 176                           {"hold-reinstreq",pkgCache::State::HoldReInstReq}};
 177    if (GrabWord(string(Start,I-Start),FlagList,
 178                 _count(FlagList),Pkg->InstState) == false)
 179       return _error->Error("Malformed 2nd word in the Status line");
 180
 181    // Isloate the last word
 182    I++;
 183    Start = I;
 184    for(; I < Stop && *I != ' '; I++);
 185    if (I != Stop)
 186       return _error->Error("Malformed Status line, no 3rd word");
 187
 188    // Process the flag field
 189    WordList StatusList[] = {{"not-installed",pkgCache::State::NotInstalled},
 190                             {"unpacked",pkgCache::State::UnPacked},
 191                             {"half-configured",pkgCache::State::HalfConfigured},
 192                             {"installed",pkgCache::State::Installed},
 193                             {"uninstalled",pkgCache::State::UnInstalled},
 194                             {"half-installed",pkgCache::State::HalfInstalled},
 195                             {"config-files",pkgCache::State::ConfigFiles},
 196                             {"post-inst-failed",pkgCache::State::HalfConfigured},
 197                             {"removal-failed",pkgCache::State::HalfInstalled}};
 198    if (GrabWord(string(Start,I-Start),StatusList,
 199                 _count(StatusList),Pkg->CurrentState) == false)
 200       return _error->Error("Malformed 3rd word in the Status line");
 201
 202    /* A Status line marks the package as indicating the current
 203       version as well. Only if it is actually installed.. Otherwise
 204       the interesting dpkg handling of the status file creates bogus
 205       entries. */
 206    if (!(Pkg->CurrentState == pkgCache::State::NotInstalled ||
 207          Pkg->CurrentState == pkgCache::State::ConfigFiles))
 208    {
 209       if (Ver.end() == true)
 210          _error->Warning("Encountered status field in a non-version description");
 211       else
 212          Pkg->CurrentVer = Ver.Index();
 213    }
 214
 215    return true;
 216 }
 217                                                                         /*}}}*/
 218 // ListParser::ParseDepends - Parse a dependency element                /*{{{*/
 219 // ---------------------------------------------------------------------
 220 /* This parses the dependency elements out of a standard string in place,
 221    bit by bit. */
 222 const char *debListParser::ParseDepends(const char *Start,const char *Stop,
 223                                         string &Package,string &Ver,
 224                                         unsigned int &Op)
 225 {
 226    // Strip off leading space
 227    for (;Start != Stop && isspace(*Start) != 0; Start++);
 228
 229    // Parse off the package name
 230    const char *I = Start;
 231    for (;I != Stop && isspace(*I) == 0 && *I != '(' && *I != ')' &&
 232         *I != ',' && *I != '|'; I++);
 233
 234    // Malformed, no '('
 235    if (I != Stop && *I == ')')
 236       return 0;
 237
 238    if (I == Start)
 239       return 0;
 240
 241    // Stash the package name
 242    Package.assign(Start,I - Start);
 243
 244    // Skip white space to the '('
 245    for (;I != Stop && isspace(*I) != 0 ; I++);
 246
 247    // Parse a version
 248    if (I != Stop && *I == '(')
 249    {
 250       // Skip the '('
 251       for (I++; I != Stop && isspace(*I) != 0 ; I++);
 252       if (I + 3 >= Stop)
 253          return 0;
 254
 255       // Determine the operator
 256       switch (*I)
 257       {
 258          case '<':
 259          I++;
 260          if (*I == '=')
 261          {
 262             I++;
 263             Op = pkgCache::Dep::LessEq;
 264             break;
 265          }
 266
 267          if (*I == '<')
 268          {
 269             I++;
 270             Op = pkgCache::Dep::Less;
 271             break;
 272          }
 273
 274          // < is the same as <= and << is really Cs < for some reason
 275          Op = pkgCache::Dep::LessEq;
 276          break;
 277
 278          case '>':
 279          I++;
 280          if (*I == '=')
 281          {
 282             I++;
 283             Op = pkgCache::Dep::GreaterEq;
 284             break;
 285          }
 286
 287          if (*I == '>')
 288          {
 289             I++;
 290             Op = pkgCache::Dep::Greater;
 291             break;
 292          }
 293
 294          // > is the same as >= and >> is really Cs > for some reason
 295          Op = pkgCache::Dep::GreaterEq;
 296          break;
 297
 298          case '=':
 299          Op = pkgCache::Dep::Equals;
 300          I++;
 301          break;
 302
 303          // HACK around bad package definitions
 304          default:
 305          Op = pkgCache::Dep::Equals;
 306          break;
 307       }
 308
 309       // Skip whitespace
 310       for (;I != Stop && isspace(*I) != 0; I++);
 311       Start = I;
 312       for (;I != Stop && *I != ')'; I++);
 313       if (I == Stop || Start == I)
 314          return 0;
 315
 316       Ver = string(Start,I-Start);
 317       I++;
 318    }
 319    else
 320    {
 321       Ver = string();
 322       Op = pkgCache::Dep::NoOp;
 323    }
 324
 325    // Skip whitespace
 326    for (;I != Stop && isspace(*I) != 0; I++);
 327    if (I != Stop && *I == '|')
 328       Op |= pkgCache::Dep::Or;
 329
 330    if (I == Stop || *I == ',' || *I == '|')
 331    {
 332       if (I != Stop)
 333          for (I++; I != Stop && isspace(*I) != 0; I++);
 334       return I;
 335    }
 336
 337    return 0;
 338 }
 339                                                                         /*}}}*/
 340 // ListParser::ParseDepends - Parse a dependency list                   /*{{{*/
 341 // ---------------------------------------------------------------------
 342 /* This is the higher level depends parser. It takes a tag and generates
 343    a complete depends tree for the given version. */
 344 bool debListParser::ParseDepends(pkgCache::VerIterator Ver,
 345                                  const char *Tag,unsigned int Type)
 346 {
 347    const char *Start;
 348    const char *Stop;
 349    if (Section.Find(Tag,Start,Stop) == false)
 350       return true;
 351
 352    string Package;
 353    string Version;
 354    unsigned int Op;
 355
 356    while (1)
 357    {
 358       Start = ParseDepends(Start,Stop,Package,Version,Op);
 359       if (Start == 0)
 360          return _error->Error("Problem parsing dependency %s",Tag);
 361
 362       if (NewDepends(Ver,Package,Version,Op,Type) == false)
 363          return false;
 364       if (Start == Stop)
 365          break;
 366    }
 367    return true;
 368 }
 369                                                                         /*}}}*/
 370 // ListParser::ParseProvides - Parse the provides list                  /*{{{*/
 371 // ---------------------------------------------------------------------
 372 /* */
 373 bool debListParser::ParseProvides(pkgCache::VerIterator Ver)
 374 {
 375    const char *Start;
 376    const char *Stop;
 377    if (Section.Find("Provides",Start,Stop) == false)
 378       return true;
 379
 380    string Package;
 381    string Version;
 382    unsigned int Op;
 383
 384    while (1)
 385    {
 386       Start = ParseDepends(Start,Stop,Package,Version,Op);
 387       if (Start == 0)
 388          return _error->Error("Problem parsing Provides line");
 389       if (Op != pkgCache::Dep::NoOp)
 390          return _error->Error("Malformed provides line");
 391
 392       if (NewProvides(Ver,Package,Version) == false)
 393          return false;
 394
 395       if (Start == Stop)
 396          break;
 397    }
 398
 399    return true;
 400 }
 401                                                                         /*}}}*/
 402 // ListParser::GrabWord - Matches a word and returns                    /*{{{*/
 403 // ---------------------------------------------------------------------
 404 /* Looks for a word in a list of words - for ParseStatus */
 405 bool debListParser::GrabWord(string Word,WordList *List,int Count,
 406                              unsigned char &Out)
 407 {
 408    for (int C = 0; C != Count; C++)
 409    {
 410       if (strcasecmp(Word.c_str(),List[C].Str) == 0)
 411       {
 412          Out = List[C].Val;
 413          return true;
 414       }
 415    }
 416    return false;
 417 }
 418                                                                         /*}}}*/
 419 // ListParser::Step - Move to the next section in the file              /*{{{*/
 420 // ---------------------------------------------------------------------
 421 /* This has to be carefull to only process the correct architecture */
 422 bool debListParser::Step()
 423 {
 424    iOffset = Tags.Offset();
 425    string Arch = _config->Find("APT::architecture");
 426    while (Tags.Step(Section) == true)
 427    {
 428       /* See if this is the correct Architecture, if it isnt then we
 429          drop the whole section */
 430       const char *Start;
 431       const char *Stop;
 432       if (Section.Find("Architecture",Start,Stop) == false)
 433          return true;
 434
 435       if (stringcmp(Start,Stop,Arch.begin(),Arch.end()) == 0)
 436          return true;
 437
 438       if (stringcmp(Start,Stop,"all") == 0)
 439          return true;
 440
 441       iOffset = Tags.Offset();
 442    }
 443    return false;
 444 }
 445                                                                         /*}}}*/
 446 // ListParser::LoadReleaseInfo - Load the release information           /*{{{*/
 447 // ---------------------------------------------------------------------
 448 /* */
 449 bool debListParser::LoadReleaseInfo(pkgCache::PkgFileIterator FileI,
 450                                     FileFd &File)
 451 {
 452    pkgTagFile Tags(File);
 453    pkgTagSection Section;
 454    if (Tags.Step(Section) == false)
 455       return false;
 456
 457    const char *Start;
 458    const char *Stop;
 459    if (Section.Find("Archive",Start,Stop) == true)
 460       FileI->Archive = WriteUniqString(Start,Stop - Start);
 461    if (Section.Find("Component",Start,Stop) == true)
 462       FileI->Component = WriteUniqString(Start,Stop - Start);
 463    if (Section.Find("Version",Start,Stop) == true)
 464       FileI->Version = WriteUniqString(Start,Stop - Start);
 465    if (Section.Find("Origin",Start,Stop) == true)
 466       FileI->Origin = WriteUniqString(Start,Stop - Start);
 467    if (Section.Find("Label",Start,Stop) == true)
 468       FileI->Label = WriteUniqString(Start,Stop - Start);
 469    if (Section.Find("Architecture",Start,Stop) == true)
 470       FileI->Architecture = WriteUniqString(Start,Stop - Start);
 471
 472    if (Section.FindFlag("NotAutomatic",FileI->Flags,
 473                         pkgCache::Flag::NotAutomatic) == false)
 474       _error->Warning("Bad NotAutomatic flag");
 475
 476    return !_error->PendingError();
 477 }
 478                                                                         /*}}}*/