apt-pkg/acquire-item.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: acquire-item.cc,v 1.46.2.9 2004/01/16 18:51:11 mdz Exp $
   4 /* ######################################################################
   5
   6    Acquire Item - Item to acquire
   7
   8    Each item can download to exactly one file at a time. This means you
   9    cannot create an item that fetches two uri's to two files at the same
  10    time. The pkgAcqIndex class creates a second class upon instantiation
  11    to fetch the other index files because of this.
  12
  13    ##################################################################### */
  14                                                                         /*}}}*/
  15 // Include Files                                                        /*{{{*/
  16 #ifdef __GNUG__
  17 #pragma implementation "apt-pkg/acquire-item.h"
  18 #endif
  19 #include <apt-pkg/acquire-item.h>
  20 #include <apt-pkg/configuration.h>
  21 #include <apt-pkg/sourcelist.h>
  22 #include <apt-pkg/vendorlist.h>
  23 #include <apt-pkg/error.h>
  24 #include <apt-pkg/strutl.h>
  25 #include <apt-pkg/fileutl.h>
  26 #include <apt-pkg/md5.h>
  27
  28 #include <apti18n.h>
  29
  30 #include <sys/stat.h>
  31 #include <unistd.h>
  32 #include <errno.h>
  33 #include <string>
  34 #include <stdio.h>
  35                                                                         /*}}}*/
  36
  37 using namespace std;
  38
  39 // Acquire::Item::Item - Constructor                                    /*{{{*/
  40 // ---------------------------------------------------------------------
  41 /* */
  42 pkgAcquire::Item::Item(pkgAcquire *Owner) : Owner(Owner), FileSize(0),
  43                        PartialSize(0), Mode(0), ID(0), Complete(false),
  44                        Local(false), QueueCounter(0)
  45 {
  46    Owner->Add(this);
  47    Status = StatIdle;
  48 }
  49                                                                         /*}}}*/
  50 // Acquire::Item::~Item - Destructor                                    /*{{{*/
  51 // ---------------------------------------------------------------------
  52 /* */
  53 pkgAcquire::Item::~Item()
  54 {
  55    Owner->Remove(this);
  56 }
  57                                                                         /*}}}*/
  58 // Acquire::Item::Failed - Item failed to download                      /*{{{*/
  59 // ---------------------------------------------------------------------
  60 /* We return to an idle state if there are still other queues that could
  61    fetch this object */
  62 void pkgAcquire::Item::Failed(string Message,pkgAcquire::MethodConfig *Cnf)
  63 {
  64    Status = StatIdle;
  65    ErrorText = LookupTag(Message,"Message");
  66    if (QueueCounter <= 1)
  67    {
  68       /* This indicates that the file is not available right now but might
  69          be sometime later. If we do a retry cycle then this should be
  70          retried [CDROMs] */
  71       if (Cnf->LocalOnly == true &&
  72           StringToBool(LookupTag(Message,"Transient-Failure"),false) == true)
  73       {
  74          Status = StatIdle;
  75          Dequeue();
  76          return;
  77       }
  78
  79       Status = StatError;
  80       Dequeue();
  81    }
  82 }
  83                                                                         /*}}}*/
  84 // Acquire::Item::Start - Item has begun to download                    /*{{{*/
  85 // ---------------------------------------------------------------------
  86 /* Stash status and the file size. Note that setting Complete means
  87    sub-phases of the acquire process such as decompresion are operating */
  88 void pkgAcquire::Item::Start(string /*Message*/,unsigned long Size)
  89 {
  90    Status = StatFetching;
  91    if (FileSize == 0 && Complete == false)
  92       FileSize = Size;
  93 }
  94                                                                         /*}}}*/
  95 // Acquire::Item::Done - Item downloaded OK                             /*{{{*/
  96 // ---------------------------------------------------------------------
  97 /* */
  98 void pkgAcquire::Item::Done(string Message,unsigned long Size,string,
  99                             pkgAcquire::MethodConfig *Cnf)
 100 {
 101    // We just downloaded something..
 102    string FileName = LookupTag(Message,"Filename");
 103    if (Complete == false && FileName == DestFile)
 104    {
 105       if (Owner->Log != 0)
 106          Owner->Log->Fetched(Size,atoi(LookupTag(Message,"Resume-Point","0").c_str()));
 107    }
 108
 109    if (FileSize == 0)
 110       FileSize= Size;
 111
 112    Status = StatDone;
 113    ErrorText = string();
 114    Owner->Dequeue(this);
 115 }
 116                                                                         /*}}}*/
 117 // Acquire::Item::Rename - Rename a file                                /*{{{*/
 118 // ---------------------------------------------------------------------
 119 /* This helper function is used by alot of item methods as thier final
 120    step */
 121 void pkgAcquire::Item::Rename(string From,string To)
 122 {
 123    if (rename(From.c_str(),To.c_str()) != 0)
 124    {
 125       char S[300];
 126       snprintf(S,sizeof(S),_("rename failed, %s (%s -> %s)."),strerror(errno),
 127               From.c_str(),To.c_str());
 128       Status = StatError;
 129       ErrorText = S;
 130    }
 131 }
 132                                                                         /*}}}*/
 133
 134 // AcqIndex::AcqIndex - Constructor                                     /*{{{*/
 135 // ---------------------------------------------------------------------
 136 /* The package file is added to the queue and a second class is
 137    instantiated to fetch the revision file */
 138 pkgAcqIndex::pkgAcqIndex(pkgAcquire *Owner,
 139                          string URI,string URIDesc,string ShortDesc,
 140                          string ExpectedMD5, string comprExt) :
 141    Item(Owner), RealURI(URI), ExpectedMD5(ExpectedMD5)
 142 {
 143    Decompression = false;
 144    Erase = false;
 145
 146    DestFile = _config->FindDir("Dir::State::lists") + "partial/";
 147    DestFile += URItoFileName(URI);
 148
 149    if(comprExt.empty())
 150    {
 151       // autoselect
 152       if(FileExists("/usr/bin/bzip2"))
 153          Desc.URI = URI + ".bz2";
 154       else
 155          Desc.URI = URI + ".gz";
 156    } else {
 157       Desc.URI = URI + comprExt;
 158    }
 159
 160    Desc.Description = URIDesc;
 161    Desc.Owner = this;
 162    Desc.ShortDesc = ShortDesc;
 163
 164    QueueURI(Desc);
 165 }
 166                                                                         /*}}}*/
 167 // AcqIndex::Custom600Headers - Insert custom request headers           /*{{{*/
 168 // ---------------------------------------------------------------------
 169 /* The only header we use is the last-modified header. */
 170 string pkgAcqIndex::Custom600Headers()
 171 {
 172    string Final = _config->FindDir("Dir::State::lists");
 173    Final += URItoFileName(RealURI);
 174
 175    struct stat Buf;
 176    if (stat(Final.c_str(),&Buf) != 0)
 177       return "\nIndex-File: true";
 178
 179    return "\nIndex-File: true\nLast-Modified: " + TimeRFC1123(Buf.st_mtime);
 180 }
 181                                                                         /*}}}*/
 182
 183 void pkgAcqIndex::Failed(string Message,pkgAcquire::MethodConfig *Cnf)
 184 {
 185    // no .bz2 found, retry with .gz
 186    if(Desc.URI.substr(Desc.URI.size()-3,Desc.URI.size()-1) == "bz2") {
 187       Desc.URI = Desc.URI.substr(0,Desc.URI.size()-3) + "gz";
 188
 189       // retry with a gzip one
 190       new pkgAcqIndex(Owner, RealURI, Desc.Description,Desc.ShortDesc,
 191                       ExpectedMD5, string(".gz"));
 192       Status = StatDone;
 193       Complete = false;
 194       Dequeue();
 195       return;
 196    }
 197
 198
 199    Item::Failed(Message,Cnf);
 200 }
 201
 202
 203 // AcqIndex::Done - Finished a fetch                                    /*{{{*/
 204 // ---------------------------------------------------------------------
 205 /* This goes through a number of states.. On the initial fetch the
 206    method could possibly return an alternate filename which points
 207    to the uncompressed version of the file. If this is so the file
 208    is copied into the partial directory. In all other cases the file
 209    is decompressed with a gzip uri. */
 210 void pkgAcqIndex::Done(string Message,unsigned long Size,string MD5,
 211                        pkgAcquire::MethodConfig *Cfg)
 212 {
 213    Item::Done(Message,Size,MD5,Cfg);
 214
 215    if (Decompression == true)
 216    {
 217       if (_config->FindB("Debug::pkgAcquire::Auth", false))
 218       {
 219          std::cerr << std::endl << RealURI << ": Computed MD5: " << MD5;
 220          std::cerr << "  Expected MD5: " << ExpectedMD5 << std::endl;
 221       }
 222
 223       if (MD5.empty())
 224       {
 225          MD5Summation sum;
 226          FileFd Fd(DestFile, FileFd::ReadOnly);
 227          sum.AddFD(Fd.Fd(), Fd.Size());
 228          Fd.Close();
 229          MD5 = (string)sum.Result();
 230       }
 231
 232       if (!ExpectedMD5.empty() && MD5 != ExpectedMD5)
 233       {
 234          Status = StatAuthError;
 235          ErrorText = _("MD5Sum mismatch");
 236          Rename(DestFile,DestFile + ".FAILED");
 237          return;
 238       }
 239       // Done, move it into position
 240       string FinalFile = _config->FindDir("Dir::State::lists");
 241       FinalFile += URItoFileName(RealURI);
 242       Rename(DestFile,FinalFile);
 243       chmod(FinalFile.c_str(),0644);
 244
 245       /* We restore the original name to DestFile so that the clean operation
 246          will work OK */
 247       DestFile = _config->FindDir("Dir::State::lists") + "partial/";
 248       DestFile += URItoFileName(RealURI);
 249
 250       // Remove the compressed version.
 251       if (Erase == true)
 252          unlink(DestFile.c_str());
 253       return;
 254    }
 255
 256    Erase = false;
 257    Complete = true;
 258
 259    // Handle the unzipd case
 260    string FileName = LookupTag(Message,"Alt-Filename");
 261    if (FileName.empty() == false)
 262    {
 263       // The files timestamp matches
 264       if (StringToBool(LookupTag(Message,"Alt-IMS-Hit"),false) == true)
 265          return;
 266
 267       Decompression = true;
 268       Local = true;
 269       DestFile += ".decomp";
 270       Desc.URI = "copy:" + FileName;
 271       QueueURI(Desc);
 272       Mode = "copy";
 273       return;
 274    }
 275
 276    FileName = LookupTag(Message,"Filename");
 277    if (FileName.empty() == true)
 278    {
 279       Status = StatError;
 280       ErrorText = "Method gave a blank filename";
 281    }
 282
 283    // The files timestamp matches
 284    if (StringToBool(LookupTag(Message,"IMS-Hit"),false) == true)
 285       return;
 286
 287    if (FileName == DestFile)
 288       Erase = true;
 289    else
 290       Local = true;
 291
 292    string compExt = Desc.URI.substr(Desc.URI.size()-3,Desc.URI.size()-1);
 293    char *decompProg;
 294    if(compExt == "bz2")
 295       decompProg = "bzip2";
 296    else if(compExt == ".gz")
 297       decompProg = "gzip";
 298    else {
 299       _error->Error("Unsupported extension: %s", compExt.c_str());
 300       return;
 301    }
 302
 303    Decompression = true;
 304    DestFile += ".decomp";
 305    Desc.URI = string(decompProg) + ":" + FileName;
 306    QueueURI(Desc);
 307    Mode = decompProg;
 308 }
 309
 310 pkgAcqMetaSig::pkgAcqMetaSig(pkgAcquire *Owner,
 311                              string URI,string URIDesc,string ShortDesc,
 312                              string MetaIndexURI, string MetaIndexURIDesc,
 313                              string MetaIndexShortDesc,
 314                              const vector<IndexTarget*>* IndexTargets,
 315                              indexRecords* MetaIndexParser) :
 316    Item(Owner), RealURI(URI), MetaIndexURI(MetaIndexURI),
 317    MetaIndexURIDesc(MetaIndexURIDesc), MetaIndexShortDesc(MetaIndexShortDesc)
 318 {
 319    this->MetaIndexParser = MetaIndexParser;
 320    this->IndexTargets = IndexTargets;
 321    DestFile = _config->FindDir("Dir::State::lists") + "partial/";
 322    DestFile += URItoFileName(URI);
 323
 324    // remove any partial downloaded sig-file. it may confuse proxies
 325    // and is too small to warrant a partial download anyway
 326    unlink(DestFile.c_str());
 327
 328    // Create the item
 329    Desc.Description = URIDesc;
 330    Desc.Owner = this;
 331    Desc.ShortDesc = ShortDesc;
 332    Desc.URI = URI;
 333
 334
 335    string Final = _config->FindDir("Dir::State::lists");
 336    Final += URItoFileName(RealURI);
 337    struct stat Buf;
 338    if (stat(Final.c_str(),&Buf) == 0)
 339    {
 340       // File was already in place.  It needs to be re-verified
 341       // because Release might have changed, so Move it into partial
 342       Rename(Final,DestFile);
 343       // unlink the file and do not try to use I-M-S and Last-Modified
 344       // if the users proxy is broken
 345       if(_config->FindB("Acquire::BrokenProxy", false) == true) {
 346          std::cerr << "forcing re-get of the signature file as requested" << std::endl;
 347          unlink(DestFile.c_str());
 348       }
 349    }
 350
 351    QueueURI(Desc);
 352 }
 353                                                                         /*}}}*/
 354 // pkgAcqMetaSig::Custom600Headers - Insert custom request headers      /*{{{*/
 355 // ---------------------------------------------------------------------
 356 /* The only header we use is the last-modified header. */
 357 string pkgAcqMetaSig::Custom600Headers()
 358 {
 359    struct stat Buf;
 360    if (stat(DestFile.c_str(),&Buf) != 0)
 361       return "\nIndex-File: true";
 362
 363    return "\nIndex-File: true\nLast-Modified: " + TimeRFC1123(Buf.st_mtime);
 364 }
 365
 366 void pkgAcqMetaSig::Done(string Message,unsigned long Size,string MD5,
 367                          pkgAcquire::MethodConfig *Cfg)
 368 {
 369    Item::Done(Message,Size,MD5,Cfg);
 370
 371    string FileName = LookupTag(Message,"Filename");
 372    if (FileName.empty() == true)
 373    {
 374       Status = StatError;
 375       ErrorText = "Method gave a blank filename";
 376       return;
 377    }
 378
 379    if (FileName != DestFile)
 380    {
 381       // We have to copy it into place
 382       Local = true;
 383       Desc.URI = "copy:" + FileName;
 384       QueueURI(Desc);
 385       return;
 386    }
 387
 388    Complete = true;
 389
 390    // queue a pkgAcqMetaIndex to be verified against the sig we just retrieved
 391    new pkgAcqMetaIndex(Owner, MetaIndexURI, MetaIndexURIDesc, MetaIndexShortDesc,
 392                        DestFile, IndexTargets, MetaIndexParser);
 393
 394 }
 395                                                                         /*}}}*/
 396 void pkgAcqMetaSig::Failed(string Message,pkgAcquire::MethodConfig *Cnf)
 397 {
 398    // Delete any existing sigfile, so that this source isn't
 399    // mistakenly trusted
 400    string Final = _config->FindDir("Dir::State::lists") + URItoFileName(RealURI);
 401    unlink(Final.c_str());
 402
 403    // if we get a timeout if fail
 404    if(LookupTag(Message,"FailReason") == "Timeout" ||
 405       LookupTag(Message,"FailReason") == "TmpResolveFailure") {
 406       Item::Failed(Message,Cnf);
 407       return;
 408    }
 409
 410    // queue a pkgAcqMetaIndex with no sigfile
 411    new pkgAcqMetaIndex(Owner, MetaIndexURI, MetaIndexURIDesc, MetaIndexShortDesc,
 412                        "", IndexTargets, MetaIndexParser);
 413
 414    if (Cnf->LocalOnly == true ||
 415        StringToBool(LookupTag(Message,"Transient-Failure"),false) == false)
 416    {
 417       // Ignore this
 418       Status = StatDone;
 419       Complete = false;
 420       Dequeue();
 421       return;
 422    }
 423
 424    Item::Failed(Message,Cnf);
 425 }
 426
 427 pkgAcqMetaIndex::pkgAcqMetaIndex(pkgAcquire *Owner,
 428                                  string URI,string URIDesc,string ShortDesc,
 429                                  string SigFile,
 430                                  const vector<struct IndexTarget*>* IndexTargets,
 431                                  indexRecords* MetaIndexParser) :
 432   Item(Owner), RealURI(URI), SigFile(SigFile)
 433 {
 434    this->AuthPass = false;
 435    this->MetaIndexParser = MetaIndexParser;
 436    this->IndexTargets = IndexTargets;
 437    DestFile = _config->FindDir("Dir::State::lists") + "partial/";
 438    DestFile += URItoFileName(URI);
 439
 440    // Create the item
 441    Desc.Description = URIDesc;
 442    Desc.Owner = this;
 443    Desc.ShortDesc = ShortDesc;
 444    Desc.URI = URI;
 445
 446    QueueURI(Desc);
 447 }
 448
 449                                                                         /*}}}*/
 450 // pkgAcqMetaIndex::Custom600Headers - Insert custom request headers    /*{{{*/
 451 // ---------------------------------------------------------------------
 452 /* The only header we use is the last-modified header. */
 453 string pkgAcqMetaIndex::Custom600Headers()
 454 {
 455    string Final = _config->FindDir("Dir::State::lists");
 456    Final += URItoFileName(RealURI);
 457
 458    struct stat Buf;
 459    if (stat(Final.c_str(),&Buf) != 0)
 460       return "\nIndex-File: true";
 461
 462    return "\nIndex-File: true\nLast-Modified: " + TimeRFC1123(Buf.st_mtime);
 463 }
 464
 465 void pkgAcqMetaIndex::Done(string Message,unsigned long Size,string MD5,
 466                            pkgAcquire::MethodConfig *Cfg)
 467 {
 468    Item::Done(Message,Size,MD5,Cfg);
 469
 470    // MetaIndexes are done in two passes: one to download the
 471    // metaindex with an appropriate method, and a second to verify it
 472    // with the gpgv method
 473
 474    if (AuthPass == true)
 475    {
 476       AuthDone(Message);
 477    }
 478    else
 479    {
 480       RetrievalDone(Message);
 481       if (!Complete)
 482          // Still more retrieving to do
 483          return;
 484
 485       if (SigFile == "")
 486       {
 487          // There was no signature file, so we are finished.  Download
 488          // the indexes without verification.
 489          QueueIndexes(false);
 490       }
 491       else
 492       {
 493          // There was a signature file, so pass it to gpgv for
 494          // verification
 495
 496          if (_config->FindB("Debug::pkgAcquire::Auth", false))
 497             std::cerr << "Metaindex acquired, queueing gpg verification ("
 498                       << SigFile << "," << DestFile << ")\n";
 499          AuthPass = true;
 500          Desc.URI = "gpgv:" + SigFile;
 501          QueueURI(Desc);
 502          Mode = "gpgv";
 503       }
 504    }
 505 }
 506
 507 void pkgAcqMetaIndex::RetrievalDone(string Message)
 508 {
 509    // We have just finished downloading a Release file (it is not
 510    // verified yet)
 511
 512    string FileName = LookupTag(Message,"Filename");
 513    if (FileName.empty() == true)
 514    {
 515       Status = StatError;
 516       ErrorText = "Method gave a blank filename";
 517       return;
 518    }
 519
 520    if (FileName != DestFile)
 521    {
 522       Local = true;
 523       Desc.URI = "copy:" + FileName;
 524       QueueURI(Desc);
 525       return;
 526    }
 527
 528    Complete = true;
 529
 530    string FinalFile = _config->FindDir("Dir::State::lists");
 531    FinalFile += URItoFileName(RealURI);
 532
 533    // The files timestamp matches
 534    if (StringToBool(LookupTag(Message,"IMS-Hit"),false) == false)
 535    {
 536       // Move it into position
 537       Rename(DestFile,FinalFile);
 538    }
 539    DestFile = FinalFile;
 540 }
 541
 542 void pkgAcqMetaIndex::AuthDone(string Message)
 543 {
 544    // At this point, the gpgv method has succeeded, so there is a
 545    // valid signature from a key in the trusted keyring.  We
 546    // perform additional verification of its contents, and use them
 547    // to verify the indexes we are about to download
 548
 549    if (!MetaIndexParser->Load(DestFile))
 550    {
 551       Status = StatAuthError;
 552       ErrorText = MetaIndexParser->ErrorText;
 553       return;
 554    }
 555
 556    if (!VerifyVendor())
 557    {
 558       return;
 559    }
 560
 561    if (_config->FindB("Debug::pkgAcquire::Auth", false))
 562       std::cerr << "Signature verification succeeded: "
 563                 << DestFile << std::endl;
 564
 565    // Download further indexes with verification
 566    QueueIndexes(true);
 567
 568    // Done, move signature file into position
 569
 570    string VerifiedSigFile = _config->FindDir("Dir::State::lists") +
 571       URItoFileName(RealURI) + ".gpg";
 572    Rename(SigFile,VerifiedSigFile);
 573    chmod(VerifiedSigFile.c_str(),0644);
 574 }
 575
 576 void pkgAcqMetaIndex::QueueIndexes(bool verify)
 577 {
 578    for (vector <struct IndexTarget*>::const_iterator Target = IndexTargets->begin();
 579         Target != IndexTargets->end();
 580         Target++)
 581    {
 582       string ExpectedIndexMD5;
 583       if (verify)
 584       {
 585          const indexRecords::checkSum *Record = MetaIndexParser->Lookup((*Target)->MetaKey);
 586          if (!Record)
 587          {
 588             Status = StatAuthError;
 589             ErrorText = "Unable to find expected entry  "
 590                + (*Target)->MetaKey + " in Meta-index file (malformed Release file?)";
 591             return;
 592          }
 593          ExpectedIndexMD5 = Record->MD5Hash;
 594          if (_config->FindB("Debug::pkgAcquire::Auth", false))
 595          {
 596             std::cerr << "Queueing: " << (*Target)->URI << std::endl;
 597             std::cerr << "Expected MD5: " << ExpectedIndexMD5 << std::endl;
 598          }
 599          if (ExpectedIndexMD5.empty())
 600          {
 601             Status = StatAuthError;
 602             ErrorText = "Unable to find MD5 sum for "
 603                + (*Target)->MetaKey + " in Meta-index file";
 604             return;
 605          }
 606       }
 607
 608       // Queue Packages file
 609       new pkgAcqIndex(Owner, (*Target)->URI, (*Target)->Description,
 610                       (*Target)->ShortDesc, ExpectedIndexMD5);
 611    }
 612 }
 613
 614 bool pkgAcqMetaIndex::VerifyVendor()
 615 {
 616 //    // Maybe this should be made available from above so we don't have
 617 //    // to read and parse it every time?
 618 //    pkgVendorList List;
 619 //    List.ReadMainList();
 620
 621 //    const Vendor* Vndr = NULL;
 622 //    for (std::vector<string>::const_iterator I = GPGVOutput.begin(); I != GPGVOutput.end(); I++)
 623 //    {
 624 //       string::size_type pos = (*I).find("VALIDSIG ");
 625 //       if (_config->FindB("Debug::Vendor", false))
 626 //          std::cerr << "Looking for VALIDSIG in \"" << (*I) << "\": pos " << pos
 627 //                    << std::endl;
 628 //       if (pos != std::string::npos)
 629 //       {
 630 //          string Fingerprint = (*I).substr(pos+sizeof("VALIDSIG"));
 631 //          if (_config->FindB("Debug::Vendor", false))
 632 //             std::cerr << "Looking for \"" << Fingerprint << "\" in vendor..." <<
 633 //                std::endl;
 634 //          Vndr = List.FindVendor(Fingerprint) != "";
 635 //          if (Vndr != NULL);
 636 //          break;
 637 //       }
 638 //    }
 639
 640    string Transformed = MetaIndexParser->GetExpectedDist();
 641
 642    if (Transformed == "../project/experimental")
 643    {
 644       Transformed = "experimental";
 645    }
 646
 647    string::size_type pos = Transformed.rfind('/');
 648    if (pos != string::npos)
 649    {
 650       Transformed = Transformed.substr(0, pos);
 651    }
 652
 653    if (Transformed == ".")
 654    {
 655       Transformed = "";
 656    }
 657
 658    if (_config->FindB("Debug::pkgAcquire::Auth", false))
 659    {
 660       std::cerr << "Got Codename: " << MetaIndexParser->GetDist() << std::endl;
 661       std::cerr << "Expecting Dist: " << MetaIndexParser->GetExpectedDist() << std::endl;
 662       std::cerr << "Transformed Dist: " << Transformed << std::endl;
 663    }
 664
 665    if (MetaIndexParser->CheckDist(Transformed) == false)
 666    {
 667       // This might become fatal one day
 668 //       Status = StatAuthError;
 669 //       ErrorText = "Conflicting distribution; expected "
 670 //          + MetaIndexParser->GetExpectedDist() + " but got "
 671 //          + MetaIndexParser->GetDist();
 672 //       return false;
 673       if (!Transformed.empty())
 674       {
 675          _error->Warning("Conflicting distribution: %s (expected %s but got %s)",
 676                          Desc.Description.c_str(),
 677                          Transformed.c_str(),
 678                          MetaIndexParser->GetDist().c_str());
 679       }
 680    }
 681
 682    return true;
 683 }
 684                                                                 /*}}}*/
 685 // pkgAcqMetaIndex::Failed - no Release file present or no signature
 686 //      file present                                            /*{{{*/
 687 // ---------------------------------------------------------------------
 688 /* */
 689 void pkgAcqMetaIndex::Failed(string Message,pkgAcquire::MethodConfig *Cnf)
 690 {
 691    if (AuthPass == true)
 692    {
 693       // gpgv method failed
 694       _error->Warning("GPG error: %s: %s",
 695                       Desc.Description.c_str(),
 696                       LookupTag(Message,"Message").c_str());
 697    }
 698
 699    // No Release file was present, or verification failed, so fall
 700    // back to queueing Packages files without verification
 701    QueueIndexes(false);
 702 }
 703
 704                                                                         /*}}}*/
 705
 706 // AcqArchive::AcqArchive - Constructor                                 /*{{{*/
 707 // ---------------------------------------------------------------------
 708 /* This just sets up the initial fetch environment and queues the first
 709    possibilitiy */
 710 pkgAcqArchive::pkgAcqArchive(pkgAcquire *Owner,pkgSourceList *Sources,
 711                              pkgRecords *Recs,pkgCache::VerIterator const &Version,
 712                              string &StoreFilename) :
 713                Item(Owner), Version(Version), Sources(Sources), Recs(Recs),
 714                StoreFilename(StoreFilename), Vf(Version.FileList()),
 715                Trusted(false)
 716 {
 717    Retries = _config->FindI("Acquire::Retries",0);
 718
 719    if (Version.Arch() == 0)
 720    {
 721       _error->Error(_("I wasn't able to locate a file for the %s package. "
 722                       "This might mean you need to manually fix this package. "
 723                       "(due to missing arch)"),
 724                     Version.ParentPkg().Name());
 725       return;
 726    }
 727
 728    /* We need to find a filename to determine the extension. We make the
 729       assumption here that all the available sources for this version share
 730       the same extension.. */
 731    // Skip not source sources, they do not have file fields.
 732    for (; Vf.end() == false; Vf++)
 733    {
 734       if ((Vf.File()->Flags & pkgCache::Flag::NotSource) != 0)
 735          continue;
 736       break;
 737    }
 738
 739    // Does not really matter here.. we are going to fail out below
 740    if (Vf.end() != true)
 741    {
 742       // If this fails to get a file name we will bomb out below.
 743       pkgRecords::Parser &Parse = Recs->Lookup(Vf);
 744       if (_error->PendingError() == true)
 745          return;
 746
 747       // Generate the final file name as: package_version_arch.foo
 748       StoreFilename = QuoteString(Version.ParentPkg().Name(),"_:") + '_' +
 749                       QuoteString(Version.VerStr(),"_:") + '_' +
 750                       QuoteString(Version.Arch(),"_:.") +
 751                       "." + flExtension(Parse.FileName());
 752    }
 753
 754    // check if we have one trusted source for the package. if so, switch
 755    // to "TrustedOnly" mode
 756    for (pkgCache::VerFileIterator i = Version.FileList(); i.end() == false; i++)
 757    {
 758       pkgIndexFile *Index;
 759       if (Sources->FindIndex(i.File(),Index) == false)
 760          continue;
 761       if (_config->FindB("Debug::pkgAcquire::Auth", false))
 762       {
 763          std::cerr << "Checking index: " << Index->Describe()
 764                    << "(Trusted=" << Index->IsTrusted() << ")\n";
 765       }
 766       if (Index->IsTrusted()) {
 767          Trusted = true;
 768          break;
 769       }
 770    }
 771
 772    // Select a source
 773    if (QueueNext() == false && _error->PendingError() == false)
 774       _error->Error(_("I wasn't able to locate file for the %s package. "
 775                     "This might mean you need to manually fix this package."),
 776                     Version.ParentPkg().Name());
 777 }
 778                                                                         /*}}}*/
 779 // AcqArchive::QueueNext - Queue the next file source                   /*{{{*/
 780 // ---------------------------------------------------------------------
 781 /* This queues the next available file version for download. It checks if
 782    the archive is already available in the cache and stashs the MD5 for
 783    checking later. */
 784 bool pkgAcqArchive::QueueNext()
 785 {
 786    for (; Vf.end() == false; Vf++)
 787    {
 788       // Ignore not source sources
 789       if ((Vf.File()->Flags & pkgCache::Flag::NotSource) != 0)
 790          continue;
 791
 792       // Try to cross match against the source list
 793       pkgIndexFile *Index;
 794       if (Sources->FindIndex(Vf.File(),Index) == false)
 795             continue;
 796
 797       // only try to get a trusted package from another source if that source
 798       // is also trusted
 799       if(Trusted && !Index->IsTrusted())
 800          continue;
 801
 802       // Grab the text package record
 803       pkgRecords::Parser &Parse = Recs->Lookup(Vf);
 804       if (_error->PendingError() == true)
 805          return false;
 806
 807       string PkgFile = Parse.FileName();
 808       MD5 = Parse.MD5Hash();
 809       if (PkgFile.empty() == true)
 810          return _error->Error(_("The package index files are corrupted. No Filename: "
 811                               "field for package %s."),
 812                               Version.ParentPkg().Name());
 813
 814       Desc.URI = Index->ArchiveURI(PkgFile);
 815       Desc.Description = Index->ArchiveInfo(Version);
 816       Desc.Owner = this;
 817       Desc.ShortDesc = Version.ParentPkg().Name();
 818
 819       // See if we already have the file. (Legacy filenames)
 820       FileSize = Version->Size;
 821       string FinalFile = _config->FindDir("Dir::Cache::Archives") + flNotDir(PkgFile);
 822       struct stat Buf;
 823       if (stat(FinalFile.c_str(),&Buf) == 0)
 824       {
 825          // Make sure the size matches
 826          if ((unsigned)Buf.st_size == Version->Size)
 827          {
 828             Complete = true;
 829             Local = true;
 830             Status = StatDone;
 831             StoreFilename = DestFile = FinalFile;
 832             return true;
 833          }
 834
 835          /* Hmm, we have a file and its size does not match, this means it is
 836             an old style mismatched arch */
 837          unlink(FinalFile.c_str());
 838       }
 839
 840       // Check it again using the new style output filenames
 841       FinalFile = _config->FindDir("Dir::Cache::Archives") + flNotDir(StoreFilename);
 842       if (stat(FinalFile.c_str(),&Buf) == 0)
 843       {
 844          // Make sure the size matches
 845          if ((unsigned)Buf.st_size == Version->Size)
 846          {
 847             Complete = true;
 848             Local = true;
 849             Status = StatDone;
 850             StoreFilename = DestFile = FinalFile;
 851             return true;
 852          }
 853
 854          /* Hmm, we have a file and its size does not match, this shouldnt
 855             happen.. */
 856          unlink(FinalFile.c_str());
 857       }
 858
 859       DestFile = _config->FindDir("Dir::Cache::Archives") + "partial/" + flNotDir(StoreFilename);
 860
 861       // Check the destination file
 862       if (stat(DestFile.c_str(),&Buf) == 0)
 863       {
 864          // Hmm, the partial file is too big, erase it
 865          if ((unsigned)Buf.st_size > Version->Size)
 866             unlink(DestFile.c_str());
 867          else
 868             PartialSize = Buf.st_size;
 869       }
 870
 871       // Create the item
 872       Local = false;
 873       Desc.URI = Index->ArchiveURI(PkgFile);
 874       Desc.Description = Index->ArchiveInfo(Version);
 875       Desc.Owner = this;
 876       Desc.ShortDesc = Version.ParentPkg().Name();
 877       QueueURI(Desc);
 878
 879       Vf++;
 880       return true;
 881    }
 882    return false;
 883 }
 884                                                                         /*}}}*/
 885 // AcqArchive::Done - Finished fetching                                 /*{{{*/
 886 // ---------------------------------------------------------------------
 887 /* */
 888 void pkgAcqArchive::Done(string Message,unsigned long Size,string Md5Hash,
 889                          pkgAcquire::MethodConfig *Cfg)
 890 {
 891    Item::Done(Message,Size,Md5Hash,Cfg);
 892
 893    // Check the size
 894    if (Size != Version->Size)
 895    {
 896       Status = StatError;
 897       ErrorText = _("Size mismatch");
 898       return;
 899    }
 900
 901    // Check the md5
 902    if (Md5Hash.empty() == false && MD5.empty() == false)
 903    {
 904       if (Md5Hash != MD5)
 905       {
 906          Status = StatError;
 907          ErrorText = _("MD5Sum mismatch");
 908          if(FileExists(DestFile))
 909             Rename(DestFile,DestFile + ".FAILED");
 910          return;
 911       }
 912    }
 913
 914    // Grab the output filename
 915    string FileName = LookupTag(Message,"Filename");
 916    if (FileName.empty() == true)
 917    {
 918       Status = StatError;
 919       ErrorText = "Method gave a blank filename";
 920       return;
 921    }
 922
 923    Complete = true;
 924
 925    // Reference filename
 926    if (FileName != DestFile)
 927    {
 928       StoreFilename = DestFile = FileName;
 929       Local = true;
 930       return;
 931    }
 932
 933    // Done, move it into position
 934    string FinalFile = _config->FindDir("Dir::Cache::Archives");
 935    FinalFile += flNotDir(StoreFilename);
 936    Rename(DestFile,FinalFile);
 937
 938    StoreFilename = DestFile = FinalFile;
 939    Complete = true;
 940 }
 941                                                                         /*}}}*/
 942 // AcqArchive::Failed - Failure handler                                 /*{{{*/
 943 // ---------------------------------------------------------------------
 944 /* Here we try other sources */
 945 void pkgAcqArchive::Failed(string Message,pkgAcquire::MethodConfig *Cnf)
 946 {
 947    ErrorText = LookupTag(Message,"Message");
 948
 949    /* We don't really want to retry on failed media swaps, this prevents
 950       that. An interesting observation is that permanent failures are not
 951       recorded. */
 952    if (Cnf->Removable == true &&
 953        StringToBool(LookupTag(Message,"Transient-Failure"),false) == true)
 954    {
 955       // Vf = Version.FileList();
 956       while (Vf.end() == false) Vf++;
 957       StoreFilename = string();
 958       Item::Failed(Message,Cnf);
 959       return;
 960    }
 961
 962    if (QueueNext() == false)
 963    {
 964       // This is the retry counter
 965       if (Retries != 0 &&
 966           Cnf->LocalOnly == false &&
 967           StringToBool(LookupTag(Message,"Transient-Failure"),false) == true)
 968       {
 969          Retries--;
 970          Vf = Version.FileList();
 971          if (QueueNext() == true)
 972             return;
 973       }
 974
 975       StoreFilename = string();
 976       Item::Failed(Message,Cnf);
 977    }
 978 }
 979                                                                         /*}}}*/
 980 // AcqArchive::IsTrusted - Determine whether this archive comes from a
 981 // trusted source                                                       /*{{{*/
 982 // ---------------------------------------------------------------------
 983 bool pkgAcqArchive::IsTrusted()
 984 {
 985    return Trusted;
 986 }
 987
 988 // AcqArchive::Finished - Fetching has finished, tidy up                /*{{{*/
 989 // ---------------------------------------------------------------------
 990 /* */
 991 void pkgAcqArchive::Finished()
 992 {
 993    if (Status == pkgAcquire::Item::StatDone &&
 994        Complete == true)
 995       return;
 996    StoreFilename = string();
 997 }
 998                                                                         /*}}}*/
 999
1000 // AcqFile::pkgAcqFile - Constructor                                    /*{{{*/
1001 // ---------------------------------------------------------------------
1002 /* The file is added to the queue */
1003 pkgAcqFile::pkgAcqFile(pkgAcquire *Owner,string URI,string MD5,
1004                        unsigned long Size,string Dsc,string ShortDesc) :
1005                        Item(Owner), Md5Hash(MD5)
1006 {
1007    Retries = _config->FindI("Acquire::Retries",0);
1008
1009    DestFile = flNotDir(URI);
1010
1011    // Create the item
1012    Desc.URI = URI;
1013    Desc.Description = Dsc;
1014    Desc.Owner = this;
1015
1016    // Set the short description to the archive component
1017    Desc.ShortDesc = ShortDesc;
1018
1019    // Get the transfer sizes
1020    FileSize = Size;
1021    struct stat Buf;
1022    if (stat(DestFile.c_str(),&Buf) == 0)
1023    {
1024       // Hmm, the partial file is too big, erase it
1025       if ((unsigned)Buf.st_size > Size)
1026          unlink(DestFile.c_str());
1027       else
1028          PartialSize = Buf.st_size;
1029    }
1030
1031    QueueURI(Desc);
1032 }
1033                                                                         /*}}}*/
1034 // AcqFile::Done - Item downloaded OK                                   /*{{{*/
1035 // ---------------------------------------------------------------------
1036 /* */
1037 void pkgAcqFile::Done(string Message,unsigned long Size,string MD5,
1038                       pkgAcquire::MethodConfig *Cnf)
1039 {
1040    // Check the md5
1041    if (Md5Hash.empty() == false && MD5.empty() == false)
1042    {
1043       if (Md5Hash != MD5)
1044       {
1045          Status = StatError;
1046          ErrorText = "MD5Sum mismatch";
1047          Rename(DestFile,DestFile + ".FAILED");
1048          return;
1049       }
1050    }
1051
1052    Item::Done(Message,Size,MD5,Cnf);
1053
1054    string FileName = LookupTag(Message,"Filename");
1055    if (FileName.empty() == true)
1056    {
1057       Status = StatError;
1058       ErrorText = "Method gave a blank filename";
1059       return;
1060    }
1061
1062    Complete = true;
1063
1064    // The files timestamp matches
1065    if (StringToBool(LookupTag(Message,"IMS-Hit"),false) == true)
1066       return;
1067
1068    // We have to copy it into place
1069    if (FileName != DestFile)
1070    {
1071       Local = true;
1072       if (_config->FindB("Acquire::Source-Symlinks",true) == false ||
1073           Cnf->Removable == true)
1074       {
1075          Desc.URI = "copy:" + FileName;
1076          QueueURI(Desc);
1077          return;
1078       }
1079
1080       // Erase the file if it is a symlink so we can overwrite it
1081       struct stat St;
1082       if (lstat(DestFile.c_str(),&St) == 0)
1083       {
1084          if (S_ISLNK(St.st_mode) != 0)
1085             unlink(DestFile.c_str());
1086       }
1087
1088       // Symlink the file
1089       if (symlink(FileName.c_str(),DestFile.c_str()) != 0)
1090       {
1091          ErrorText = "Link to " + DestFile + " failure ";
1092          Status = StatError;
1093          Complete = false;
1094       }
1095    }
1096 }
1097                                                                         /*}}}*/
1098 // AcqFile::Failed - Failure handler                                    /*{{{*/
1099 // ---------------------------------------------------------------------
1100 /* Here we try other sources */
1101 void pkgAcqFile::Failed(string Message,pkgAcquire::MethodConfig *Cnf)
1102 {
1103    ErrorText = LookupTag(Message,"Message");
1104
1105    // This is the retry counter
1106    if (Retries != 0 &&
1107        Cnf->LocalOnly == false &&
1108        StringToBool(LookupTag(Message,"Transient-Failure"),false) == true)
1109    {
1110       Retries--;
1111       QueueURI(Desc);
1112       return;
1113    }
1114
1115    Item::Failed(Message,Cnf);
1116 }
1117                                                                         /*}}}*/