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 #include <config.h>
  17
  18 #include <apt-pkg/acquire-item.h>
  19 #include <apt-pkg/configuration.h>
  20 #include <apt-pkg/aptconfiguration.h>
  21 #include <apt-pkg/sourcelist.h>
  22 #include <apt-pkg/error.h>
  23 #include <apt-pkg/strutl.h>
  24 #include <apt-pkg/fileutl.h>
  25 #include <apt-pkg/md5.h>
  26 #include <apt-pkg/sha1.h>
  27 #include <apt-pkg/tagfile.h>
  28 #include <apt-pkg/indexrecords.h>
  29 #include <apt-pkg/metaindex.h>
  30
  31 #include <sys/stat.h>
  32 #include <unistd.h>
  33 #include <errno.h>
  34 #include <string>
  35 #include <sstream>
  36 #include <stdio.h>
  37 #include <ctime>
  38
  39 #include <apti18n.h>
  40                                                                         /*}}}*/
  41
  42 using namespace std;
  43
  44 // Acquire::Item::Item - Constructor                                    /*{{{*/
  45 // ---------------------------------------------------------------------
  46 /* */
  47 pkgAcquire::Item::Item(pkgAcquire *Owner) : Owner(Owner), FileSize(0),
  48                        PartialSize(0), Mode(0), ID(0), Complete(false),
  49                        Local(false), QueueCounter(0)
  50 {
  51    Owner->Add(this);
  52    Status = StatIdle;
  53 }
  54                                                                         /*}}}*/
  55 // Acquire::Item::~Item - Destructor                                    /*{{{*/
  56 // ---------------------------------------------------------------------
  57 /* */
  58 pkgAcquire::Item::~Item()
  59 {
  60    Owner->Remove(this);
  61 }
  62                                                                         /*}}}*/
  63 // Acquire::Item::Failed - Item failed to download                      /*{{{*/
  64 // ---------------------------------------------------------------------
  65 /* We return to an idle state if there are still other queues that could
  66    fetch this object */
  67 void pkgAcquire::Item::Failed(string Message,pkgAcquire::MethodConfig *Cnf)
  68 {
  69    Status = StatIdle;
  70    ErrorText = LookupTag(Message,"Message");
  71    UsedMirror =  LookupTag(Message,"UsedMirror");
  72    if (QueueCounter <= 1)
  73    {
  74       /* This indicates that the file is not available right now but might
  75          be sometime later. If we do a retry cycle then this should be
  76          retried [CDROMs] */
  77       if (Cnf->LocalOnly == true &&
  78           StringToBool(LookupTag(Message,"Transient-Failure"),false) == true)
  79       {
  80          Status = StatIdle;
  81          Dequeue();
  82          return;
  83       }
  84
  85       Status = StatError;
  86       Dequeue();
  87    }
  88
  89    // report mirror failure back to LP if we actually use a mirror
  90    string FailReason = LookupTag(Message, "FailReason");
  91    if(FailReason.size() != 0)
  92       ReportMirrorFailure(FailReason);
  93    else
  94       ReportMirrorFailure(ErrorText);
  95 }
  96                                                                         /*}}}*/
  97 // Acquire::Item::Start - Item has begun to download                    /*{{{*/
  98 // ---------------------------------------------------------------------
  99 /* Stash status and the file size. Note that setting Complete means
 100    sub-phases of the acquire process such as decompresion are operating */
 101 void pkgAcquire::Item::Start(string /*Message*/,unsigned long long Size)
 102 {
 103    Status = StatFetching;
 104    if (FileSize == 0 && Complete == false)
 105       FileSize = Size;
 106 }
 107                                                                         /*}}}*/
 108 // Acquire::Item::Done - Item downloaded OK                             /*{{{*/
 109 // ---------------------------------------------------------------------
 110 /* */
 111 void pkgAcquire::Item::Done(string Message,unsigned long long Size,string Hash,
 112                             pkgAcquire::MethodConfig *Cnf)
 113 {
 114    // We just downloaded something..
 115    string FileName = LookupTag(Message,"Filename");
 116    UsedMirror =  LookupTag(Message,"UsedMirror");
 117    if (Complete == false && !Local && FileName == DestFile)
 118    {
 119       if (Owner->Log != 0)
 120          Owner->Log->Fetched(Size,atoi(LookupTag(Message,"Resume-Point","0").c_str()));
 121    }
 122
 123    if (FileSize == 0)
 124       FileSize= Size;
 125    Status = StatDone;
 126    ErrorText = string();
 127    Owner->Dequeue(this);
 128 }
 129                                                                         /*}}}*/
 130 // Acquire::Item::Rename - Rename a file                                /*{{{*/
 131 // ---------------------------------------------------------------------
 132 /* This helper function is used by alot of item methods as thier final
 133    step */
 134 void pkgAcquire::Item::Rename(string From,string To)
 135 {
 136    if (rename(From.c_str(),To.c_str()) != 0)
 137    {
 138       char S[300];
 139       snprintf(S,sizeof(S),_("rename failed, %s (%s -> %s)."),strerror(errno),
 140               From.c_str(),To.c_str());
 141       Status = StatError;
 142       ErrorText = S;
 143    }
 144 }
 145                                                                         /*}}}*/
 146 // Acquire::Item::ReportMirrorFailure                                   /*{{{*/
 147 // ---------------------------------------------------------------------
 148 void pkgAcquire::Item::ReportMirrorFailure(string FailCode)
 149 {
 150    // we only act if a mirror was used at all
 151    if(UsedMirror.empty())
 152       return;
 153 #if 0
 154    std::cerr << "\nReportMirrorFailure: "
 155              << UsedMirror
 156              << " Uri: " << DescURI()
 157              << " FailCode: "
 158              << FailCode << std::endl;
 159 #endif
 160    const char *Args[40];
 161    unsigned int i = 0;
 162    string report = _config->Find("Methods::Mirror::ProblemReporting",
 163                                  "/usr/lib/apt/apt-report-mirror-failure");
 164    if(!FileExists(report))
 165       return;
 166    Args[i++] = report.c_str();
 167    Args[i++] = UsedMirror.c_str();
 168    Args[i++] = DescURI().c_str();
 169    Args[i++] = FailCode.c_str();
 170    Args[i++] = NULL;
 171    pid_t pid = ExecFork();
 172    if(pid < 0)
 173    {
 174       _error->Error("ReportMirrorFailure Fork failed");
 175       return;
 176    }
 177    else if(pid == 0)
 178    {
 179       execvp(Args[0], (char**)Args);
 180       std::cerr << "Could not exec " << Args[0] << std::endl;
 181       _exit(100);
 182    }
 183    if(!ExecWait(pid, "report-mirror-failure"))
 184    {
 185       _error->Warning("Couldn't report problem to '%s'",
 186                       _config->Find("Methods::Mirror::ProblemReporting").c_str());
 187    }
 188 }
 189                                                                         /*}}}*/
 190 // AcqSubIndex::AcqSubIndex - Constructor                               /*{{{*/
 191 // ---------------------------------------------------------------------
 192 /* Get a sub-index file based on checksums from a 'master' file and
 193    possibly query additional files */
 194 pkgAcqSubIndex::pkgAcqSubIndex(pkgAcquire *Owner, string const &URI,
 195                                  string const &URIDesc, string const &ShortDesc,
 196                                  HashString const &ExpectedHash)
 197    : Item(Owner), ExpectedHash(ExpectedHash)
 198 {
 199    /* XXX: Beware: Currently this class does nothing (of value) anymore ! */
 200    Debug = _config->FindB("Debug::pkgAcquire::SubIndex",false);
 201
 202    DestFile = _config->FindDir("Dir::State::lists") + "partial/";
 203    DestFile += URItoFileName(URI);
 204
 205    Desc.URI = URI;
 206    Desc.Description = URIDesc;
 207    Desc.Owner = this;
 208    Desc.ShortDesc = ShortDesc;
 209
 210    QueueURI(Desc);
 211
 212    if(Debug)
 213       std::clog << "pkgAcqSubIndex: " << Desc.URI << std::endl;
 214 }
 215                                                                         /*}}}*/
 216 // AcqSubIndex::Custom600Headers - Insert custom request headers        /*{{{*/
 217 // ---------------------------------------------------------------------
 218 /* The only header we use is the last-modified header. */
 219 string pkgAcqSubIndex::Custom600Headers()
 220 {
 221    string Final = _config->FindDir("Dir::State::lists");
 222    Final += URItoFileName(Desc.URI);
 223
 224    struct stat Buf;
 225    if (stat(Final.c_str(),&Buf) != 0)
 226       return "\nIndex-File: true\nFail-Ignore: true\n";
 227    return "\nIndex-File: true\nFail-Ignore: true\nLast-Modified: " + TimeRFC1123(Buf.st_mtime);
 228 }
 229                                                                         /*}}}*/
 230 void pkgAcqSubIndex::Failed(string Message,pkgAcquire::MethodConfig *Cnf)       /*{{{*/
 231 {
 232    if(Debug)
 233       std::clog << "pkgAcqSubIndex failed: " << Desc.URI << std::endl;
 234
 235    Complete = false;
 236    Status = StatDone;
 237    Dequeue();
 238
 239    // No good Index is provided
 240 }
 241                                                                         /*}}}*/
 242 void pkgAcqSubIndex::Done(string Message,unsigned long long Size,string Md5Hash,        /*{{{*/
 243                            pkgAcquire::MethodConfig *Cnf)
 244 {
 245    if(Debug)
 246       std::clog << "pkgAcqSubIndex::Done(): " << Desc.URI << std::endl;
 247
 248    string FileName = LookupTag(Message,"Filename");
 249    if (FileName.empty() == true)
 250    {
 251       Status = StatError;
 252       ErrorText = "Method gave a blank filename";
 253       return;
 254    }
 255
 256    if (FileName != DestFile)
 257    {
 258       Local = true;
 259       Desc.URI = "copy:" + FileName;
 260       QueueURI(Desc);
 261       return;
 262    }
 263
 264    Item::Done(Message,Size,Md5Hash,Cnf);
 265
 266    string FinalFile = _config->FindDir("Dir::State::lists")+URItoFileName(Desc.URI);
 267
 268    /* Downloaded invalid transindex => Error (LP: #346386) (Closes: #627642) */
 269    indexRecords SubIndexParser;
 270    if (FileExists(DestFile) == true && !SubIndexParser.Load(DestFile)) {
 271       Status = StatError;
 272       ErrorText = SubIndexParser.ErrorText;
 273       return;
 274    }
 275
 276    // sucess in downloading the index
 277    // rename the index
 278    if(Debug)
 279       std::clog << "Renaming: " << DestFile << " -> " << FinalFile << std::endl;
 280    Rename(DestFile,FinalFile);
 281    chmod(FinalFile.c_str(),0644);
 282    DestFile = FinalFile;
 283
 284    if(ParseIndex(DestFile) == false)
 285       return Failed("", NULL);
 286
 287    Complete = true;
 288    Status = StatDone;
 289    Dequeue();
 290    return;
 291 }
 292                                                                         /*}}}*/
 293 bool pkgAcqSubIndex::ParseIndex(string const &IndexFile)                /*{{{*/
 294 {
 295    indexRecords SubIndexParser;
 296    if (FileExists(IndexFile) == false || SubIndexParser.Load(IndexFile) == false)
 297       return false;
 298    // so something with the downloaded index
 299    return true;
 300 }
 301                                                                         /*}}}*/
 302 // AcqDiffIndex::AcqDiffIndex - Constructor                             /*{{{*/
 303 // ---------------------------------------------------------------------
 304 /* Get the DiffIndex file first and see if there are patches availabe
 305  * If so, create a pkgAcqIndexDiffs fetcher that will get and apply the
 306  * patches. If anything goes wrong in that process, it will fall back to
 307  * the original packages file
 308  */
 309 pkgAcqDiffIndex::pkgAcqDiffIndex(pkgAcquire *Owner,
 310                                  string URI,string URIDesc,string ShortDesc,
 311                                  HashString ExpectedHash)
 312    : Item(Owner), RealURI(URI), ExpectedHash(ExpectedHash),
 313      Description(URIDesc)
 314 {
 315
 316    Debug = _config->FindB("Debug::pkgAcquire::Diffs",false);
 317
 318    Desc.Description = URIDesc + "/DiffIndex";
 319    Desc.Owner = this;
 320    Desc.ShortDesc = ShortDesc;
 321    Desc.URI = URI + ".diff/Index";
 322
 323    DestFile = _config->FindDir("Dir::State::lists") + "partial/";
 324    DestFile += URItoFileName(URI) + string(".DiffIndex");
 325
 326    if(Debug)
 327       std::clog << "pkgAcqDiffIndex: " << Desc.URI << std::endl;
 328
 329    // look for the current package file
 330    CurrentPackagesFile = _config->FindDir("Dir::State::lists");
 331    CurrentPackagesFile += URItoFileName(RealURI);
 332
 333    // FIXME: this file:/ check is a hack to prevent fetching
 334    //        from local sources. this is really silly, and
 335    //        should be fixed cleanly as soon as possible
 336    if(!FileExists(CurrentPackagesFile) ||
 337       Desc.URI.substr(0,strlen("file:/")) == "file:/")
 338    {
 339       // we don't have a pkg file or we don't want to queue
 340       if(Debug)
 341          std::clog << "No index file, local or canceld by user" << std::endl;
 342       Failed("", NULL);
 343       return;
 344    }
 345
 346    if(Debug)
 347       std::clog << "pkgAcqIndexDiffs::pkgAcqIndexDiffs(): "
 348                 << CurrentPackagesFile << std::endl;
 349
 350    QueueURI(Desc);
 351
 352 }
 353                                                                         /*}}}*/
 354 // AcqIndex::Custom600Headers - Insert custom request headers           /*{{{*/
 355 // ---------------------------------------------------------------------
 356 /* The only header we use is the last-modified header. */
 357 string pkgAcqDiffIndex::Custom600Headers()
 358 {
 359    string Final = _config->FindDir("Dir::State::lists");
 360    Final += URItoFileName(RealURI) + string(".IndexDiff");
 361
 362    if(Debug)
 363       std::clog << "Custom600Header-IMS: " << Final << std::endl;
 364
 365    struct stat Buf;
 366    if (stat(Final.c_str(),&Buf) != 0)
 367       return "\nIndex-File: true";
 368
 369    return "\nIndex-File: true\nLast-Modified: " + TimeRFC1123(Buf.st_mtime);
 370 }
 371                                                                         /*}}}*/
 372 bool pkgAcqDiffIndex::ParseDiffIndex(string IndexDiffFile)              /*{{{*/
 373 {
 374    if(Debug)
 375       std::clog << "pkgAcqIndexDiffs::ParseIndexDiff() " << IndexDiffFile
 376                 << std::endl;
 377
 378    pkgTagSection Tags;
 379    string ServerSha1;
 380    vector<DiffInfo> available_patches;
 381
 382    FileFd Fd(IndexDiffFile,FileFd::ReadOnly);
 383    pkgTagFile TF(&Fd);
 384    if (_error->PendingError() == true)
 385       return false;
 386
 387    if(TF.Step(Tags) == true)
 388    {
 389       bool found = false;
 390       DiffInfo d;
 391       string size;
 392
 393       string const tmp = Tags.FindS("SHA1-Current");
 394       std::stringstream ss(tmp);
 395       ss >> ServerSha1 >> size;
 396       unsigned long const ServerSize = atol(size.c_str());
 397
 398       FileFd fd(CurrentPackagesFile, FileFd::ReadOnly);
 399       SHA1Summation SHA1;
 400       SHA1.AddFD(fd);
 401       string const local_sha1 = SHA1.Result();
 402
 403       if(local_sha1 == ServerSha1)
 404       {
 405          // we have the same sha1 as the server
 406          if(Debug)
 407             std::clog << "Package file is up-to-date" << std::endl;
 408          // set found to true, this will queue a pkgAcqIndexDiffs with
 409          // a empty availabe_patches
 410          found = true;
 411       }
 412       else
 413       {
 414          if(Debug)
 415             std::clog << "SHA1-Current: " << ServerSha1 << " and we start at "<< fd.Name() << " " << fd.Size() << " " << local_sha1 << std::endl;
 416
 417          // check the historie and see what patches we need
 418          string const history = Tags.FindS("SHA1-History");
 419          std::stringstream hist(history);
 420          while(hist >> d.sha1 >> size >> d.file)
 421          {
 422             // read until the first match is found
 423             // from that point on, we probably need all diffs
 424             if(d.sha1 == local_sha1)
 425                found=true;
 426             else if (found == false)
 427                continue;
 428
 429             if(Debug)
 430                std::clog << "Need to get diff: " << d.file << std::endl;
 431             available_patches.push_back(d);
 432          }
 433
 434          if (available_patches.empty() == false)
 435          {
 436             // patching with too many files is rather slow compared to a fast download
 437             unsigned long const fileLimit = _config->FindI("Acquire::PDiffs::FileLimit", 0);
 438             if (fileLimit != 0 && fileLimit < available_patches.size())
 439             {
 440                if (Debug)
 441                   std::clog << "Need " << available_patches.size() << " diffs (Limit is " << fileLimit
 442                         << ") so fallback to complete download" << std::endl;
 443                return false;
 444             }
 445
 446             // see if the patches are too big
 447             found = false; // it was true and it will be true again at the end
 448             d = *available_patches.begin();
 449             string const firstPatch = d.file;
 450             unsigned long patchesSize = 0;
 451             std::stringstream patches(Tags.FindS("SHA1-Patches"));
 452             while(patches >> d.sha1 >> size >> d.file)
 453             {
 454                if (firstPatch == d.file)
 455                   found = true;
 456                else if (found == false)
 457                   continue;
 458
 459                patchesSize += atol(size.c_str());
 460             }
 461             unsigned long const sizeLimit = ServerSize * _config->FindI("Acquire::PDiffs::SizeLimit", 100);
 462             if (sizeLimit > 0 && (sizeLimit/100) < patchesSize)
 463             {
 464                if (Debug)
 465                   std::clog << "Need " << patchesSize << " bytes (Limit is " << sizeLimit/100
 466                         << ") so fallback to complete download" << std::endl;
 467                return false;
 468             }
 469          }
 470       }
 471
 472       // we have something, queue the next diff
 473       if(found)
 474       {
 475          // queue the diffs
 476          string::size_type const last_space = Description.rfind(" ");
 477          if(last_space != string::npos)
 478             Description.erase(last_space, Description.size()-last_space);
 479          new pkgAcqIndexDiffs(Owner, RealURI, Description, Desc.ShortDesc,
 480                               ExpectedHash, ServerSha1, available_patches);
 481          Complete = false;
 482          Status = StatDone;
 483          Dequeue();
 484          return true;
 485       }
 486    }
 487
 488    // Nothing found, report and return false
 489    // Failing here is ok, if we return false later, the full
 490    // IndexFile is queued
 491    if(Debug)
 492       std::clog << "Can't find a patch in the index file" << std::endl;
 493    return false;
 494 }
 495                                                                         /*}}}*/
 496 void pkgAcqDiffIndex::Failed(string Message,pkgAcquire::MethodConfig *Cnf)      /*{{{*/
 497 {
 498    if(Debug)
 499       std::clog << "pkgAcqDiffIndex failed: " << Desc.URI << std::endl
 500                 << "Falling back to normal index file aquire" << std::endl;
 501
 502    new pkgAcqIndex(Owner, RealURI, Description, Desc.ShortDesc,
 503                    ExpectedHash);
 504
 505    Complete = false;
 506    Status = StatDone;
 507    Dequeue();
 508 }
 509                                                                         /*}}}*/
 510 void pkgAcqDiffIndex::Done(string Message,unsigned long long Size,string Md5Hash,       /*{{{*/
 511                            pkgAcquire::MethodConfig *Cnf)
 512 {
 513    if(Debug)
 514       std::clog << "pkgAcqDiffIndex::Done(): " << Desc.URI << std::endl;
 515
 516    Item::Done(Message,Size,Md5Hash,Cnf);
 517
 518    string FinalFile;
 519    FinalFile = _config->FindDir("Dir::State::lists")+URItoFileName(RealURI);
 520
 521    // sucess in downloading the index
 522    // rename the index
 523    FinalFile += string(".IndexDiff");
 524    if(Debug)
 525       std::clog << "Renaming: " << DestFile << " -> " << FinalFile
 526                 << std::endl;
 527    Rename(DestFile,FinalFile);
 528    chmod(FinalFile.c_str(),0644);
 529    DestFile = FinalFile;
 530
 531    if(!ParseDiffIndex(DestFile))
 532       return Failed("", NULL);
 533
 534    Complete = true;
 535    Status = StatDone;
 536    Dequeue();
 537    return;
 538 }
 539                                                                         /*}}}*/
 540 // AcqIndexDiffs::AcqIndexDiffs - Constructor                           /*{{{*/
 541 // ---------------------------------------------------------------------
 542 /* The package diff is added to the queue. one object is constructed
 543  * for each diff and the index
 544  */
 545 pkgAcqIndexDiffs::pkgAcqIndexDiffs(pkgAcquire *Owner,
 546                                    string URI,string URIDesc,string ShortDesc,
 547                                    HashString ExpectedHash,
 548                                    string ServerSha1,
 549                                    vector<DiffInfo> diffs)
 550    : Item(Owner), RealURI(URI), ExpectedHash(ExpectedHash),
 551      available_patches(diffs), ServerSha1(ServerSha1)
 552 {
 553
 554    DestFile = _config->FindDir("Dir::State::lists") + "partial/";
 555    DestFile += URItoFileName(URI);
 556
 557    Debug = _config->FindB("Debug::pkgAcquire::Diffs",false);
 558
 559    Description = URIDesc;
 560    Desc.Owner = this;
 561    Desc.ShortDesc = ShortDesc;
 562
 563    if(available_patches.size() == 0)
 564    {
 565       // we are done (yeah!)
 566       Finish(true);
 567    }
 568    else
 569    {
 570       // get the next diff
 571       State = StateFetchDiff;
 572       QueueNextDiff();
 573    }
 574 }
 575                                                                         /*}}}*/
 576 void pkgAcqIndexDiffs::Failed(string Message,pkgAcquire::MethodConfig *Cnf)     /*{{{*/
 577 {
 578    if(Debug)
 579       std::clog << "pkgAcqIndexDiffs failed: " << Desc.URI << std::endl
 580                 << "Falling back to normal index file aquire" << std::endl;
 581    new pkgAcqIndex(Owner, RealURI, Description,Desc.ShortDesc,
 582                    ExpectedHash);
 583    Finish();
 584 }
 585                                                                         /*}}}*/
 586 // Finish - helper that cleans the item out of the fetcher queue        /*{{{*/
 587 void pkgAcqIndexDiffs::Finish(bool allDone)
 588 {
 589    // we restore the original name, this is required, otherwise
 590    // the file will be cleaned
 591    if(allDone)
 592    {
 593       DestFile = _config->FindDir("Dir::State::lists");
 594       DestFile += URItoFileName(RealURI);
 595
 596       if(!ExpectedHash.empty() && !ExpectedHash.VerifyFile(DestFile))
 597       {
 598          Status = StatAuthError;
 599          ErrorText = _("MD5Sum mismatch");
 600          Rename(DestFile,DestFile + ".FAILED");
 601          Dequeue();
 602          return;
 603       }
 604
 605       // this is for the "real" finish
 606       Complete = true;
 607       Status = StatDone;
 608       Dequeue();
 609       if(Debug)
 610          std::clog << "\n\nallDone: " << DestFile << "\n" << std::endl;
 611       return;
 612    }
 613
 614    if(Debug)
 615       std::clog << "Finishing: " << Desc.URI << std::endl;
 616    Complete = false;
 617    Status = StatDone;
 618    Dequeue();
 619    return;
 620 }
 621                                                                         /*}}}*/
 622 bool pkgAcqIndexDiffs::QueueNextDiff()                                  /*{{{*/
 623 {
 624
 625    // calc sha1 of the just patched file
 626    string FinalFile = _config->FindDir("Dir::State::lists");
 627    FinalFile += URItoFileName(RealURI);
 628
 629    FileFd fd(FinalFile, FileFd::ReadOnly);
 630    SHA1Summation SHA1;
 631    SHA1.AddFD(fd);
 632    string local_sha1 = string(SHA1.Result());
 633    if(Debug)
 634       std::clog << "QueueNextDiff: "
 635                 << FinalFile << " (" << local_sha1 << ")"<<std::endl;
 636
 637    // final file reached before all patches are applied
 638    if(local_sha1 == ServerSha1)
 639    {
 640       Finish(true);
 641       return true;
 642    }
 643
 644    // remove all patches until the next matching patch is found
 645    // this requires the Index file to be ordered
 646    for(vector<DiffInfo>::iterator I=available_patches.begin();
 647        available_patches.empty() == false &&
 648           I != available_patches.end() &&
 649           I->sha1 != local_sha1;
 650        ++I)
 651    {
 652       available_patches.erase(I);
 653    }
 654
 655    // error checking and falling back if no patch was found
 656    if(available_patches.empty() == true)
 657    {
 658       Failed("", NULL);
 659       return false;
 660    }
 661
 662    // queue the right diff
 663    Desc.URI = string(RealURI) + ".diff/" + available_patches[0].file + ".gz";
 664    Desc.Description = Description + " " + available_patches[0].file + string(".pdiff");
 665    DestFile = _config->FindDir("Dir::State::lists") + "partial/";
 666    DestFile += URItoFileName(RealURI + ".diff/" + available_patches[0].file);
 667
 668    if(Debug)
 669       std::clog << "pkgAcqIndexDiffs::QueueNextDiff(): " << Desc.URI << std::endl;
 670
 671    QueueURI(Desc);
 672
 673    return true;
 674 }
 675                                                                         /*}}}*/
 676 void pkgAcqIndexDiffs::Done(string Message,unsigned long long Size,string Md5Hash,      /*{{{*/
 677                             pkgAcquire::MethodConfig *Cnf)
 678 {
 679    if(Debug)
 680       std::clog << "pkgAcqIndexDiffs::Done(): " << Desc.URI << std::endl;
 681
 682    Item::Done(Message,Size,Md5Hash,Cnf);
 683
 684    string FinalFile;
 685    FinalFile = _config->FindDir("Dir::State::lists")+URItoFileName(RealURI);
 686
 687    // sucess in downloading a diff, enter ApplyDiff state
 688    if(State == StateFetchDiff)
 689    {
 690
 691       // rred excepts the patch as $FinalFile.ed
 692       Rename(DestFile,FinalFile+".ed");
 693
 694       if(Debug)
 695          std::clog << "Sending to rred method: " << FinalFile << std::endl;
 696
 697       State = StateApplyDiff;
 698       Local = true;
 699       Desc.URI = "rred:" + FinalFile;
 700       QueueURI(Desc);
 701       Mode = "rred";
 702       return;
 703    }
 704
 705
 706    // success in download/apply a diff, queue next (if needed)
 707    if(State == StateApplyDiff)
 708    {
 709       // remove the just applied patch
 710       available_patches.erase(available_patches.begin());
 711
 712       // move into place
 713       if(Debug)
 714       {
 715          std::clog << "Moving patched file in place: " << std::endl
 716                    << DestFile << " -> " << FinalFile << std::endl;
 717       }
 718       Rename(DestFile,FinalFile);
 719       chmod(FinalFile.c_str(),0644);
 720
 721       // see if there is more to download
 722       if(available_patches.empty() == false) {
 723          new pkgAcqIndexDiffs(Owner, RealURI, Description, Desc.ShortDesc,
 724                               ExpectedHash, ServerSha1, available_patches);
 725          return Finish();
 726       } else
 727          return Finish(true);
 728    }
 729 }
 730                                                                         /*}}}*/
 731 // AcqIndex::AcqIndex - Constructor                                     /*{{{*/
 732 // ---------------------------------------------------------------------
 733 /* The package file is added to the queue and a second class is
 734    instantiated to fetch the revision file */
 735 pkgAcqIndex::pkgAcqIndex(pkgAcquire *Owner,
 736                          string URI,string URIDesc,string ShortDesc,
 737                          HashString ExpectedHash, string comprExt)
 738    : Item(Owner), RealURI(URI), ExpectedHash(ExpectedHash)
 739 {
 740    if(comprExt.empty() == true)
 741    {
 742       // autoselect the compression method
 743       std::vector<std::string> types = APT::Configuration::getCompressionTypes();
 744       for (std::vector<std::string>::const_iterator t = types.begin(); t != types.end(); ++t)
 745          comprExt.append(*t).append(" ");
 746       if (comprExt.empty() == false)
 747          comprExt.erase(comprExt.end()-1);
 748    }
 749    CompressionExtension = comprExt;
 750
 751    Init(URI, URIDesc, ShortDesc);
 752 }
 753 pkgAcqIndex::pkgAcqIndex(pkgAcquire *Owner, IndexTarget const *Target,
 754                          HashString const &ExpectedHash, indexRecords const *MetaIndexParser)
 755    : Item(Owner), RealURI(Target->URI), ExpectedHash(ExpectedHash)
 756 {
 757    // autoselect the compression method
 758    std::vector<std::string> types = APT::Configuration::getCompressionTypes();
 759    CompressionExtension = "";
 760    if (ExpectedHash.empty() == false)
 761    {
 762       for (std::vector<std::string>::const_iterator t = types.begin(); t != types.end(); ++t)
 763          if (*t == "uncompressed" || MetaIndexParser->Exists(string(Target->MetaKey).append(".").append(*t)) == true)
 764             CompressionExtension.append(*t).append(" ");
 765    }
 766    else
 767    {
 768       for (std::vector<std::string>::const_iterator t = types.begin(); t != types.end(); ++t)
 769          CompressionExtension.append(*t).append(" ");
 770    }
 771    if (CompressionExtension.empty() == false)
 772       CompressionExtension.erase(CompressionExtension.end()-1);
 773
 774    // only verify non-optional targets, see acquire-item.h for a FIXME
 775    // to make this more flexible
 776    if (Target->IsOptional())
 777      Verify = false;
 778    else
 779      Verify = true;
 780
 781    Init(Target->URI, Target->Description, Target->ShortDesc);
 782 }
 783                                                                         /*}}}*/
 784 // AcqIndex::Init - defered Constructor                                 /*{{{*/
 785 void pkgAcqIndex::Init(string const &URI, string const &URIDesc, string const &ShortDesc) {
 786    Decompression = false;
 787    Erase = false;
 788
 789    DestFile = _config->FindDir("Dir::State::lists") + "partial/";
 790    DestFile += URItoFileName(URI);
 791
 792    std::string const comprExt = CompressionExtension.substr(0, CompressionExtension.find(' '));
 793    if (comprExt == "uncompressed")
 794       Desc.URI = URI;
 795    else
 796       Desc.URI = URI + '.' + comprExt;
 797
 798    Desc.Description = URIDesc;
 799    Desc.Owner = this;
 800    Desc.ShortDesc = ShortDesc;
 801
 802    QueueURI(Desc);
 803 }
 804                                                                         /*}}}*/
 805 // AcqIndex::Custom600Headers - Insert custom request headers           /*{{{*/
 806 // ---------------------------------------------------------------------
 807 /* The only header we use is the last-modified header. */
 808 string pkgAcqIndex::Custom600Headers()
 809 {
 810    string Final = _config->FindDir("Dir::State::lists");
 811    Final += URItoFileName(RealURI);
 812    if (_config->FindB("Acquire::GzipIndexes",false))
 813       Final += ".gz";
 814
 815    string msg = "\nIndex-File: true";
 816    // FIXME: this really should use "IndexTarget::IsOptional()" but that
 817    //        seems to be difficult without breaking ABI
 818    if (ShortDesc().find("Translation") != 0)
 819       msg += "\nFail-Ignore: true";
 820    struct stat Buf;
 821    if (stat(Final.c_str(),&Buf) == 0)
 822       msg += "\nLast-Modified: " + TimeRFC1123(Buf.st_mtime);
 823
 824    return msg;
 825 }
 826                                                                         /*}}}*/
 827 void pkgAcqIndex::Failed(string Message,pkgAcquire::MethodConfig *Cnf)  /*{{{*/
 828 {
 829    size_t const nextExt = CompressionExtension.find(' ');
 830    if (nextExt != std::string::npos)
 831    {
 832       CompressionExtension = CompressionExtension.substr(nextExt+1);
 833       Init(RealURI, Desc.Description, Desc.ShortDesc);
 834       return;
 835    }
 836
 837    // on decompression failure, remove bad versions in partial/
 838    if (Decompression && Erase) {
 839       string s = _config->FindDir("Dir::State::lists") + "partial/";
 840       s.append(URItoFileName(RealURI));
 841       unlink(s.c_str());
 842    }
 843
 844    Item::Failed(Message,Cnf);
 845 }
 846                                                                         /*}}}*/
 847 // AcqIndex::Done - Finished a fetch                                    /*{{{*/
 848 // ---------------------------------------------------------------------
 849 /* This goes through a number of states.. On the initial fetch the
 850    method could possibly return an alternate filename which points
 851    to the uncompressed version of the file. If this is so the file
 852    is copied into the partial directory. In all other cases the file
 853    is decompressed with a gzip uri. */
 854 void pkgAcqIndex::Done(string Message,unsigned long long Size,string Hash,
 855                        pkgAcquire::MethodConfig *Cfg)
 856 {
 857    Item::Done(Message,Size,Hash,Cfg);
 858
 859    if (Decompression == true)
 860    {
 861       if (_config->FindB("Debug::pkgAcquire::Auth", false))
 862       {
 863          std::cerr << std::endl << RealURI << ": Computed Hash: " << Hash;
 864          std::cerr << "  Expected Hash: " << ExpectedHash.toStr() << std::endl;
 865       }
 866
 867       if (!ExpectedHash.empty() && ExpectedHash.toStr() != Hash)
 868       {
 869          Status = StatAuthError;
 870          ErrorText = _("Hash Sum mismatch");
 871          Rename(DestFile,DestFile + ".FAILED");
 872          ReportMirrorFailure("HashChecksumFailure");
 873          return;
 874       }
 875
 876       /* Verify the index file for correctness (all indexes must
 877        * have a Package field) (LP: #346386) (Closes: #627642) */
 878       if (Verify == true)
 879       {
 880          FileFd fd(DestFile, FileFd::ReadOnly);
 881          pkgTagSection sec;
 882          pkgTagFile tag(&fd);
 883
 884          // Only test for correctness if the file is not empty (empty is ok)
 885          if (fd.Size() > 0) {
 886             if (_error->PendingError() || !tag.Step(sec)) {
 887                Status = StatError;
 888                _error->DumpErrors();
 889                Rename(DestFile,DestFile + ".FAILED");
 890                return;
 891             } else if (!sec.Exists("Package")) {
 892                Status = StatError;
 893                ErrorText = ("Encountered a section with no Package: header");
 894                Rename(DestFile,DestFile + ".FAILED");
 895                return;
 896             }
 897          }
 898       }
 899
 900       // Done, move it into position
 901       string FinalFile = _config->FindDir("Dir::State::lists");
 902       FinalFile += URItoFileName(RealURI);
 903       Rename(DestFile,FinalFile);
 904       chmod(FinalFile.c_str(),0644);
 905
 906       /* We restore the original name to DestFile so that the clean operation
 907          will work OK */
 908       DestFile = _config->FindDir("Dir::State::lists") + "partial/";
 909       DestFile += URItoFileName(RealURI);
 910
 911       // Remove the compressed version.
 912       if (Erase == true)
 913          unlink(DestFile.c_str());
 914       return;
 915    }
 916
 917    Erase = false;
 918    Complete = true;
 919
 920    // Handle the unzipd case
 921    string FileName = LookupTag(Message,"Alt-Filename");
 922    if (FileName.empty() == false)
 923    {
 924       // The files timestamp matches
 925       if (StringToBool(LookupTag(Message,"Alt-IMS-Hit"),false) == true)
 926          return;
 927       Decompression = true;
 928       Local = true;
 929       DestFile += ".decomp";
 930       Desc.URI = "copy:" + FileName;
 931       QueueURI(Desc);
 932       Mode = "copy";
 933       return;
 934    }
 935
 936    FileName = LookupTag(Message,"Filename");
 937    if (FileName.empty() == true)
 938    {
 939       Status = StatError;
 940       ErrorText = "Method gave a blank filename";
 941    }
 942
 943    std::string const compExt = CompressionExtension.substr(0, CompressionExtension.find(' '));
 944
 945    // The files timestamp matches
 946    if (StringToBool(LookupTag(Message,"IMS-Hit"),false) == true) {
 947        if (_config->FindB("Acquire::GzipIndexes",false) && compExt == "gz")
 948           // Update DestFile for .gz suffix so that the clean operation keeps it
 949           DestFile += ".gz";
 950       return;
 951     }
 952
 953    if (FileName == DestFile)
 954       Erase = true;
 955    else
 956       Local = true;
 957
 958    string decompProg;
 959
 960    // If we enable compressed indexes and already have gzip, keep it
 961    if (_config->FindB("Acquire::GzipIndexes",false) && compExt == "gz" && !Local) {
 962       string FinalFile = _config->FindDir("Dir::State::lists");
 963       FinalFile += URItoFileName(RealURI) + ".gz";
 964       Rename(DestFile,FinalFile);
 965       chmod(FinalFile.c_str(),0644);
 966
 967       // Update DestFile for .gz suffix so that the clean operation keeps it
 968       DestFile = _config->FindDir("Dir::State::lists") + "partial/";
 969       DestFile += URItoFileName(RealURI) + ".gz";
 970       return;
 971     }
 972
 973    // get the binary name for your used compression type
 974    decompProg = _config->Find(string("Acquire::CompressionTypes::").append(compExt),"");
 975    if(decompProg.empty() == false);
 976    else if(compExt == "uncompressed")
 977       decompProg = "copy";
 978    else {
 979       _error->Error("Unsupported extension: %s", compExt.c_str());
 980       return;
 981    }
 982
 983    Decompression = true;
 984    DestFile += ".decomp";
 985    Desc.URI = decompProg + ":" + FileName;
 986    QueueURI(Desc);
 987    Mode = decompProg.c_str();
 988 }
 989                                                                         /*}}}*/
 990 // AcqIndexTrans::pkgAcqIndexTrans - Constructor                        /*{{{*/
 991 // ---------------------------------------------------------------------
 992 /* The Translation file is added to the queue */
 993 pkgAcqIndexTrans::pkgAcqIndexTrans(pkgAcquire *Owner,
 994                             string URI,string URIDesc,string ShortDesc)
 995   : pkgAcqIndex(Owner, URI, URIDesc, ShortDesc, HashString(), "")
 996 {
 997 }
 998 pkgAcqIndexTrans::pkgAcqIndexTrans(pkgAcquire *Owner, IndexTarget const *Target,
 999                          HashString const &ExpectedHash, indexRecords const *MetaIndexParser)
1000   : pkgAcqIndex(Owner, Target, ExpectedHash, MetaIndexParser)
1001 {
1002 }
1003                                                                         /*}}}*/
1004 // AcqIndexTrans::Custom600Headers - Insert custom request headers      /*{{{*/
1005 // ---------------------------------------------------------------------
1006 string pkgAcqIndexTrans::Custom600Headers()
1007 {
1008    string Final = _config->FindDir("Dir::State::lists");
1009    Final += URItoFileName(RealURI);
1010
1011    struct stat Buf;
1012    if (stat(Final.c_str(),&Buf) != 0)
1013       return "\nFail-Ignore: true\nIndex-File: true";
1014    return "\nFail-Ignore: true\nIndex-File: true\nLast-Modified: " + TimeRFC1123(Buf.st_mtime);
1015 }
1016                                                                         /*}}}*/
1017 // AcqIndexTrans::Failed - Silence failure messages for missing files   /*{{{*/
1018 // ---------------------------------------------------------------------
1019 /* */
1020 void pkgAcqIndexTrans::Failed(string Message,pkgAcquire::MethodConfig *Cnf)
1021 {
1022    size_t const nextExt = CompressionExtension.find(' ');
1023    if (nextExt != std::string::npos)
1024    {
1025       CompressionExtension = CompressionExtension.substr(nextExt+1);
1026       Init(RealURI, Desc.Description, Desc.ShortDesc);
1027       Status = StatIdle;
1028       return;
1029    }
1030
1031    if (Cnf->LocalOnly == true ||
1032        StringToBool(LookupTag(Message,"Transient-Failure"),false) == false)
1033    {
1034       // Ignore this
1035       Status = StatDone;
1036       Complete = false;
1037       Dequeue();
1038       return;
1039    }
1040
1041    Item::Failed(Message,Cnf);
1042 }
1043                                                                         /*}}}*/
1044 pkgAcqMetaSig::pkgAcqMetaSig(pkgAcquire *Owner,                         /*{{{*/
1045                              string URI,string URIDesc,string ShortDesc,
1046                              string MetaIndexURI, string MetaIndexURIDesc,
1047                              string MetaIndexShortDesc,
1048                              const vector<IndexTarget*>* IndexTargets,
1049                              indexRecords* MetaIndexParser) :
1050    Item(Owner), RealURI(URI), MetaIndexURI(MetaIndexURI),
1051    MetaIndexURIDesc(MetaIndexURIDesc), MetaIndexShortDesc(MetaIndexShortDesc),
1052    MetaIndexParser(MetaIndexParser), IndexTargets(IndexTargets)
1053 {
1054    DestFile = _config->FindDir("Dir::State::lists") + "partial/";
1055    DestFile += URItoFileName(URI);
1056
1057    // remove any partial downloaded sig-file in partial/.
1058    // it may confuse proxies and is too small to warrant a
1059    // partial download anyway
1060    unlink(DestFile.c_str());
1061
1062    // Create the item
1063    Desc.Description = URIDesc;
1064    Desc.Owner = this;
1065    Desc.ShortDesc = ShortDesc;
1066    Desc.URI = URI;
1067
1068    string Final = _config->FindDir("Dir::State::lists");
1069    Final += URItoFileName(RealURI);
1070    struct stat Buf;
1071    if (stat(Final.c_str(),&Buf) == 0)
1072    {
1073       // File was already in place.  It needs to be re-downloaded/verified
1074       // because Release might have changed, we do give it a differnt
1075       // name than DestFile because otherwise the http method will
1076       // send If-Range requests and there are too many broken servers
1077       // out there that do not understand them
1078       LastGoodSig = DestFile+".reverify";
1079       Rename(Final,LastGoodSig);
1080    }
1081
1082    QueueURI(Desc);
1083 }
1084                                                                         /*}}}*/
1085 // pkgAcqMetaSig::Custom600Headers - Insert custom request headers      /*{{{*/
1086 // ---------------------------------------------------------------------
1087 /* The only header we use is the last-modified header. */
1088 string pkgAcqMetaSig::Custom600Headers()
1089 {
1090    struct stat Buf;
1091    if (stat(LastGoodSig.c_str(),&Buf) != 0)
1092       return "\nIndex-File: true";
1093
1094    return "\nIndex-File: true\nLast-Modified: " + TimeRFC1123(Buf.st_mtime);
1095 }
1096
1097 void pkgAcqMetaSig::Done(string Message,unsigned long long Size,string MD5,
1098                          pkgAcquire::MethodConfig *Cfg)
1099 {
1100    Item::Done(Message,Size,MD5,Cfg);
1101
1102    string FileName = LookupTag(Message,"Filename");
1103    if (FileName.empty() == true)
1104    {
1105       Status = StatError;
1106       ErrorText = "Method gave a blank filename";
1107       return;
1108    }
1109
1110    if (FileName != DestFile)
1111    {
1112       // We have to copy it into place
1113       Local = true;
1114       Desc.URI = "copy:" + FileName;
1115       QueueURI(Desc);
1116       return;
1117    }
1118
1119    Complete = true;
1120
1121    // put the last known good file back on i-m-s hit (it will
1122    // be re-verified again)
1123    // Else do nothing, we have the new file in DestFile then
1124    if(StringToBool(LookupTag(Message,"IMS-Hit"),false) == true)
1125       Rename(LastGoodSig, DestFile);
1126
1127    // queue a pkgAcqMetaIndex to be verified against the sig we just retrieved
1128    new pkgAcqMetaIndex(Owner, MetaIndexURI, MetaIndexURIDesc,
1129                        MetaIndexShortDesc,  DestFile, IndexTargets,
1130                        MetaIndexParser);
1131
1132 }
1133                                                                         /*}}}*/
1134 void pkgAcqMetaSig::Failed(string Message,pkgAcquire::MethodConfig *Cnf)/*{{{*/
1135 {
1136    string Final = _config->FindDir("Dir::State::lists") + URItoFileName(RealURI);
1137
1138    // if we get a network error we fail gracefully
1139    if(Status == StatTransientNetworkError)
1140    {
1141       Item::Failed(Message,Cnf);
1142       // move the sigfile back on transient network failures
1143       if(FileExists(LastGoodSig))
1144          Rename(LastGoodSig,Final);
1145
1146       // set the status back to , Item::Failed likes to reset it
1147       Status = pkgAcquire::Item::StatTransientNetworkError;
1148       return;
1149    }
1150
1151    // Delete any existing sigfile when the acquire failed
1152    unlink(Final.c_str());
1153
1154    // queue a pkgAcqMetaIndex with no sigfile
1155    new pkgAcqMetaIndex(Owner, MetaIndexURI, MetaIndexURIDesc, MetaIndexShortDesc,
1156                        "", IndexTargets, MetaIndexParser);
1157
1158    if (Cnf->LocalOnly == true ||
1159        StringToBool(LookupTag(Message,"Transient-Failure"),false) == false)
1160    {
1161       // Ignore this
1162       Status = StatDone;
1163       Complete = false;
1164       Dequeue();
1165       return;
1166    }
1167
1168    Item::Failed(Message,Cnf);
1169 }
1170                                                                         /*}}}*/
1171 pkgAcqMetaIndex::pkgAcqMetaIndex(pkgAcquire *Owner,                     /*{{{*/
1172                                  string URI,string URIDesc,string ShortDesc,
1173                                  string SigFile,
1174                                  const vector<struct IndexTarget*>* IndexTargets,
1175                                  indexRecords* MetaIndexParser) :
1176    Item(Owner), RealURI(URI), SigFile(SigFile), IndexTargets(IndexTargets),
1177    MetaIndexParser(MetaIndexParser), AuthPass(false), IMSHit(false)
1178 {
1179    DestFile = _config->FindDir("Dir::State::lists") + "partial/";
1180    DestFile += URItoFileName(URI);
1181
1182    // Create the item
1183    Desc.Description = URIDesc;
1184    Desc.Owner = this;
1185    Desc.ShortDesc = ShortDesc;
1186    Desc.URI = URI;
1187
1188    QueueURI(Desc);
1189 }
1190                                                                         /*}}}*/
1191 // pkgAcqMetaIndex::Custom600Headers - Insert custom request headers    /*{{{*/
1192 // ---------------------------------------------------------------------
1193 /* The only header we use is the last-modified header. */
1194 string pkgAcqMetaIndex::Custom600Headers()
1195 {
1196    string Final = _config->FindDir("Dir::State::lists");
1197    Final += URItoFileName(RealURI);
1198
1199    struct stat Buf;
1200    if (stat(Final.c_str(),&Buf) != 0)
1201       return "\nIndex-File: true";
1202
1203    return "\nIndex-File: true\nLast-Modified: " + TimeRFC1123(Buf.st_mtime);
1204 }
1205                                                                         /*}}}*/
1206 void pkgAcqMetaIndex::Done(string Message,unsigned long long Size,string Hash,  /*{{{*/
1207                            pkgAcquire::MethodConfig *Cfg)
1208 {
1209    Item::Done(Message,Size,Hash,Cfg);
1210
1211    // MetaIndexes are done in two passes: one to download the
1212    // metaindex with an appropriate method, and a second to verify it
1213    // with the gpgv method
1214
1215    if (AuthPass == true)
1216    {
1217       AuthDone(Message);
1218
1219       // all cool, move Release file into place
1220       Complete = true;
1221    }
1222    else
1223    {
1224       RetrievalDone(Message);
1225       if (!Complete)
1226          // Still more retrieving to do
1227          return;
1228
1229       if (SigFile == "")
1230       {
1231          // There was no signature file, so we are finished.  Download
1232          // the indexes and do only hashsum verification if possible
1233          MetaIndexParser->Load(DestFile);
1234          QueueIndexes(false);
1235       }
1236       else
1237       {
1238          // FIXME: move this into pkgAcqMetaClearSig::Done on the next
1239          //        ABI break
1240
1241          // if we expect a ClearTextSignature (InRelase), ensure that
1242          // this is what we get and if not fail to queue a
1243          // Release/Release.gpg, see #346386
1244          if (SigFile == DestFile &&
1245              !IsPgpClearTextSignature(DestFile))
1246          {
1247             Failed(Message, Cfg);
1248             return;
1249          }
1250
1251          // There was a signature file, so pass it to gpgv for
1252          // verification
1253          if (_config->FindB("Debug::pkgAcquire::Auth", false))
1254             std::cerr << "Metaindex acquired, queueing gpg verification ("
1255                       << SigFile << "," << DestFile << ")\n";
1256          AuthPass = true;
1257          Desc.URI = "gpgv:" + SigFile;
1258          QueueURI(Desc);
1259          Mode = "gpgv";
1260          return;
1261       }
1262    }
1263
1264    if (Complete == true)
1265    {
1266       string FinalFile = _config->FindDir("Dir::State::lists");
1267       FinalFile += URItoFileName(RealURI);
1268       if (SigFile == DestFile)
1269          SigFile = FinalFile;
1270       Rename(DestFile,FinalFile);
1271       chmod(FinalFile.c_str(),0644);
1272       DestFile = FinalFile;
1273    }
1274 }
1275                                                                         /*}}}*/
1276 void pkgAcqMetaIndex::RetrievalDone(string Message)                     /*{{{*/
1277 {
1278    // We have just finished downloading a Release file (it is not
1279    // verified yet)
1280
1281    string FileName = LookupTag(Message,"Filename");
1282    if (FileName.empty() == true)
1283    {
1284       Status = StatError;
1285       ErrorText = "Method gave a blank filename";
1286       return;
1287    }
1288
1289    if (FileName != DestFile)
1290    {
1291       Local = true;
1292       Desc.URI = "copy:" + FileName;
1293       QueueURI(Desc);
1294       return;
1295    }
1296
1297    // make sure to verify against the right file on I-M-S hit
1298    IMSHit = StringToBool(LookupTag(Message,"IMS-Hit"),false);
1299    if(IMSHit)
1300    {
1301       string FinalFile = _config->FindDir("Dir::State::lists");
1302       FinalFile += URItoFileName(RealURI);
1303       if (SigFile == DestFile)
1304          SigFile = FinalFile;
1305       DestFile = FinalFile;
1306    }
1307    Complete = true;
1308 }
1309                                                                         /*}}}*/
1310 void pkgAcqMetaIndex::AuthDone(string Message)                          /*{{{*/
1311 {
1312    // At this point, the gpgv method has succeeded, so there is a
1313    // valid signature from a key in the trusted keyring.  We
1314    // perform additional verification of its contents, and use them
1315    // to verify the indexes we are about to download
1316
1317    if (!MetaIndexParser->Load(DestFile))
1318    {
1319       Status = StatAuthError;
1320       ErrorText = MetaIndexParser->ErrorText;
1321       return;
1322    }
1323
1324    if (!VerifyVendor(Message))
1325    {
1326       return;
1327    }
1328
1329    if (_config->FindB("Debug::pkgAcquire::Auth", false))
1330       std::cerr << "Signature verification succeeded: "
1331                 << DestFile << std::endl;
1332
1333    // Download further indexes with verification
1334    QueueIndexes(true);
1335
1336    // is it a clearsigned MetaIndex file?
1337    if (DestFile == SigFile)
1338       return;
1339
1340    // Done, move signature file into position
1341    string VerifiedSigFile = _config->FindDir("Dir::State::lists") +
1342       URItoFileName(RealURI) + ".gpg";
1343    Rename(SigFile,VerifiedSigFile);
1344    chmod(VerifiedSigFile.c_str(),0644);
1345 }
1346                                                                         /*}}}*/
1347 void pkgAcqMetaIndex::QueueIndexes(bool verify)                         /*{{{*/
1348 {
1349 #if 0
1350    /* Reject invalid, existing Release files (LP: #346386) (Closes: #627642)
1351     * FIXME: Disabled; it breaks unsigned repositories without hashes */
1352    if (!verify && FileExists(DestFile) && !MetaIndexParser->Load(DestFile))
1353    {
1354       Status = StatError;
1355       ErrorText = MetaIndexParser->ErrorText;
1356       return;
1357    }
1358 #endif
1359    bool transInRelease = false;
1360    {
1361       std::vector<std::string> const keys = MetaIndexParser->MetaKeys();
1362       for (std::vector<std::string>::const_iterator k = keys.begin(); k != keys.end(); ++k)
1363          // FIXME: Feels wrong to check for hardcoded string here, but what should we do else…
1364          if (k->find("Translation-") != std::string::npos)
1365          {
1366             transInRelease = true;
1367             break;
1368          }
1369    }
1370
1371    for (vector <struct IndexTarget*>::const_iterator Target = IndexTargets->begin();
1372         Target != IndexTargets->end();
1373         ++Target)
1374    {
1375       HashString ExpectedIndexHash;
1376       const indexRecords::checkSum *Record = MetaIndexParser->Lookup((*Target)->MetaKey);
1377       if (Record == NULL)
1378       {
1379          if (verify == true && (*Target)->IsOptional() == false)
1380          {
1381             Status = StatAuthError;
1382             strprintf(ErrorText, _("Unable to find expected entry '%s' in Release file (Wrong sources.list entry or malformed file)"), (*Target)->MetaKey.c_str());
1383             return;
1384          }
1385       }
1386       else
1387       {
1388          ExpectedIndexHash = Record->Hash;
1389          if (_config->FindB("Debug::pkgAcquire::Auth", false))
1390          {
1391             std::cerr << "Queueing: " << (*Target)->URI << std::endl;
1392             std::cerr << "Expected Hash: " << ExpectedIndexHash.toStr() << std::endl;
1393             std::cerr << "For: " << Record->MetaKeyFilename << std::endl;
1394          }
1395          if (verify == true && ExpectedIndexHash.empty() == true && (*Target)->IsOptional() == false)
1396          {
1397             Status = StatAuthError;
1398             strprintf(ErrorText, _("Unable to find hash sum for '%s' in Release file"), (*Target)->MetaKey.c_str());
1399             return;
1400          }
1401       }
1402
1403       if ((*Target)->IsOptional() == true)
1404       {
1405          if ((*Target)->IsSubIndex() == true)
1406             new pkgAcqSubIndex(Owner, (*Target)->URI, (*Target)->Description,
1407                                 (*Target)->ShortDesc, ExpectedIndexHash);
1408          else if (transInRelease == false || MetaIndexParser->Exists((*Target)->MetaKey) == true)
1409          {
1410             if (_config->FindB("Acquire::PDiffs",true) == true && transInRelease == true &&
1411                 MetaIndexParser->Exists(string((*Target)->MetaKey).append(".diff/Index")) == true)
1412                new pkgAcqDiffIndex(Owner, (*Target)->URI, (*Target)->Description,
1413                                    (*Target)->ShortDesc, ExpectedIndexHash);
1414             else
1415                new pkgAcqIndexTrans(Owner, *Target, ExpectedIndexHash, MetaIndexParser);
1416          }
1417          continue;
1418       }
1419
1420       /* Queue Packages file (either diff or full packages files, depending
1421          on the users option) - we also check if the PDiff Index file is listed
1422          in the Meta-Index file. Ideal would be if pkgAcqDiffIndex would test this
1423          instead, but passing the required info to it is to much hassle */
1424       if(_config->FindB("Acquire::PDiffs",true) == true && (verify == false ||
1425           MetaIndexParser->Exists(string((*Target)->MetaKey).append(".diff/Index")) == true))
1426          new pkgAcqDiffIndex(Owner, (*Target)->URI, (*Target)->Description,
1427                              (*Target)->ShortDesc, ExpectedIndexHash);
1428       else
1429          new pkgAcqIndex(Owner, *Target, ExpectedIndexHash, MetaIndexParser);
1430    }
1431 }
1432                                                                         /*}}}*/
1433 bool pkgAcqMetaIndex::VerifyVendor(string Message)                      /*{{{*/
1434 {
1435    string::size_type pos;
1436
1437    // check for missing sigs (that where not fatal because otherwise we had
1438    // bombed earlier)
1439    string missingkeys;
1440    string msg = _("There is no public key available for the "
1441                   "following key IDs:\n");
1442    pos = Message.find("NO_PUBKEY ");
1443    if (pos != std::string::npos)
1444    {
1445       string::size_type start = pos+strlen("NO_PUBKEY ");
1446       string Fingerprint = Message.substr(start, Message.find("\n")-start);
1447       missingkeys += (Fingerprint);
1448    }
1449    if(!missingkeys.empty())
1450       _error->Warning("%s", string(msg+missingkeys).c_str());
1451
1452    string Transformed = MetaIndexParser->GetExpectedDist();
1453
1454    if (Transformed == "../project/experimental")
1455    {
1456       Transformed = "experimental";
1457    }
1458
1459    pos = Transformed.rfind('/');
1460    if (pos != string::npos)
1461    {
1462       Transformed = Transformed.substr(0, pos);
1463    }
1464
1465    if (Transformed == ".")
1466    {
1467       Transformed = "";
1468    }
1469
1470    if (_config->FindB("Acquire::Check-Valid-Until", true) == true &&
1471        MetaIndexParser->GetValidUntil() > 0) {
1472       time_t const invalid_since = time(NULL) - MetaIndexParser->GetValidUntil();
1473       if (invalid_since > 0)
1474          // TRANSLATOR: The first %s is the URL of the bad Release file, the second is
1475          // the time since then the file is invalid - formated in the same way as in
1476          // the download progress display (e.g. 7d 3h 42min 1s)
1477          return _error->Error(
1478             _("Release file for %s is expired (invalid since %s). "
1479               "Updates for this repository will not be applied."),
1480             RealURI.c_str(), TimeToStr(invalid_since).c_str());
1481    }
1482
1483    if (_config->FindB("Debug::pkgAcquire::Auth", false))
1484    {
1485       std::cerr << "Got Codename: " << MetaIndexParser->GetDist() << std::endl;
1486       std::cerr << "Expecting Dist: " << MetaIndexParser->GetExpectedDist() << std::endl;
1487       std::cerr << "Transformed Dist: " << Transformed << std::endl;
1488    }
1489
1490    if (MetaIndexParser->CheckDist(Transformed) == false)
1491    {
1492       // This might become fatal one day
1493 //       Status = StatAuthError;
1494 //       ErrorText = "Conflicting distribution; expected "
1495 //          + MetaIndexParser->GetExpectedDist() + " but got "
1496 //          + MetaIndexParser->GetDist();
1497 //       return false;
1498       if (!Transformed.empty())
1499       {
1500          _error->Warning(_("Conflicting distribution: %s (expected %s but got %s)"),
1501                          Desc.Description.c_str(),
1502                          Transformed.c_str(),
1503                          MetaIndexParser->GetDist().c_str());
1504       }
1505    }
1506
1507    return true;
1508 }
1509                                                                         /*}}}*/
1510 // pkgAcqMetaIndex::Failed - no Release file present or no signature file present       /*{{{*/
1511 // ---------------------------------------------------------------------
1512 /* */
1513 void pkgAcqMetaIndex::Failed(string Message,pkgAcquire::MethodConfig *Cnf)
1514 {
1515    if (AuthPass == true)
1516    {
1517       // gpgv method failed, if we have a good signature
1518       string LastGoodSigFile = _config->FindDir("Dir::State::lists");
1519       if (DestFile == SigFile)
1520          LastGoodSigFile.append(URItoFileName(RealURI));
1521       else
1522          LastGoodSigFile.append("partial/").append(URItoFileName(RealURI)).append(".gpg.reverify");
1523
1524       if(FileExists(LastGoodSigFile))
1525       {
1526          if (DestFile != SigFile)
1527          {
1528             string VerifiedSigFile = _config->FindDir("Dir::State::lists") +
1529                                         URItoFileName(RealURI) + ".gpg";
1530             Rename(LastGoodSigFile,VerifiedSigFile);
1531          }
1532          Status = StatTransientNetworkError;
1533          _error->Warning(_("A error occurred during the signature "
1534                            "verification. The repository is not updated "
1535                            "and the previous index files will be used. "
1536                            "GPG error: %s: %s\n"),
1537                          Desc.Description.c_str(),
1538                          LookupTag(Message,"Message").c_str());
1539          RunScripts("APT::Update::Auth-Failure");
1540          return;
1541       } else if (LookupTag(Message,"Message").find("NODATA") != string::npos) {
1542          /* Invalid signature file, reject (LP: #346386) (Closes: #627642) */
1543          _error->Error(_("GPG error: %s: %s"),
1544                          Desc.Description.c_str(),
1545                          LookupTag(Message,"Message").c_str());
1546          return;
1547       } else {
1548          _error->Warning(_("GPG error: %s: %s"),
1549                          Desc.Description.c_str(),
1550                          LookupTag(Message,"Message").c_str());
1551       }
1552       // gpgv method failed
1553       ReportMirrorFailure("GPGFailure");
1554    }
1555
1556    /* Always move the meta index, even if gpgv failed. This ensures
1557     * that PackageFile objects are correctly filled in */
1558    if (FileExists(DestFile)) {
1559       string FinalFile = _config->FindDir("Dir::State::lists");
1560       FinalFile += URItoFileName(RealURI);
1561       /* InRelease files become Release files, otherwise
1562        * they would be considered as trusted later on */
1563       if (SigFile == DestFile) {
1564          RealURI = RealURI.replace(RealURI.rfind("InRelease"), 9,
1565                                        "Release");
1566          FinalFile = FinalFile.replace(FinalFile.rfind("InRelease"), 9,
1567                                        "Release");
1568          SigFile = FinalFile;
1569       }
1570       Rename(DestFile,FinalFile);
1571       chmod(FinalFile.c_str(),0644);
1572
1573       DestFile = FinalFile;
1574    }
1575
1576    // No Release file was present, or verification failed, so fall
1577    // back to queueing Packages files without verification
1578    QueueIndexes(false);
1579 }
1580                                                                         /*}}}*/
1581 pkgAcqMetaClearSig::pkgAcqMetaClearSig(pkgAcquire *Owner,               /*{{{*/
1582                 string const &URI, string const &URIDesc, string const &ShortDesc,
1583                 string const &MetaIndexURI, string const &MetaIndexURIDesc, string const &MetaIndexShortDesc,
1584                 string const &MetaSigURI, string const &MetaSigURIDesc, string const &MetaSigShortDesc,
1585                 const vector<struct IndexTarget*>* IndexTargets,
1586                 indexRecords* MetaIndexParser) :
1587         pkgAcqMetaIndex(Owner, URI, URIDesc, ShortDesc, "", IndexTargets, MetaIndexParser),
1588         MetaIndexURI(MetaIndexURI), MetaIndexURIDesc(MetaIndexURIDesc), MetaIndexShortDesc(MetaIndexShortDesc),
1589         MetaSigURI(MetaSigURI), MetaSigURIDesc(MetaSigURIDesc), MetaSigShortDesc(MetaSigShortDesc)
1590 {
1591    SigFile = DestFile;
1592 }
1593                                                                         /*}}}*/
1594 // pkgAcqMetaClearSig::Custom600Headers - Insert custom request headers /*{{{*/
1595 // ---------------------------------------------------------------------
1596 // FIXME: this can go away once the InRelease file is used widely
1597 string pkgAcqMetaClearSig::Custom600Headers()
1598 {
1599    string Final = _config->FindDir("Dir::State::lists");
1600    Final += URItoFileName(RealURI);
1601
1602    struct stat Buf;
1603    if (stat(Final.c_str(),&Buf) != 0)
1604       return "\nIndex-File: true\nFail-Ignore: true\n";
1605
1606    return "\nIndex-File: true\nFail-Ignore: true\nLast-Modified: " + TimeRFC1123(Buf.st_mtime);
1607 }
1608                                                                         /*}}}*/
1609 void pkgAcqMetaClearSig::Failed(string Message,pkgAcquire::MethodConfig *Cnf) /*{{{*/
1610 {
1611    if (AuthPass == false)
1612    {
1613       // Remove the 'old' InRelease file if we try Release.gpg now as otherwise
1614       // the file will stay around and gives a false-auth impression (CVE-2012-0214)
1615       string FinalFile = _config->FindDir("Dir::State::lists");
1616       FinalFile.append(URItoFileName(RealURI));
1617       if (FileExists(FinalFile))
1618          unlink(FinalFile.c_str());
1619
1620       new pkgAcqMetaSig(Owner,
1621                         MetaSigURI, MetaSigURIDesc, MetaSigShortDesc,
1622                         MetaIndexURI, MetaIndexURIDesc, MetaIndexShortDesc,
1623                         IndexTargets, MetaIndexParser);
1624       if (Cnf->LocalOnly == true ||
1625           StringToBool(LookupTag(Message, "Transient-Failure"), false) == false)
1626          Dequeue();
1627    }
1628    else
1629       pkgAcqMetaIndex::Failed(Message, Cnf);
1630 }
1631                                                                         /*}}}*/
1632 // AcqArchive::AcqArchive - Constructor                                 /*{{{*/
1633 // ---------------------------------------------------------------------
1634 /* This just sets up the initial fetch environment and queues the first
1635    possibilitiy */
1636 pkgAcqArchive::pkgAcqArchive(pkgAcquire *Owner,pkgSourceList *Sources,
1637                              pkgRecords *Recs,pkgCache::VerIterator const &Version,
1638                              string &StoreFilename) :
1639                Item(Owner), Version(Version), Sources(Sources), Recs(Recs),
1640                StoreFilename(StoreFilename), Vf(Version.FileList()),
1641                Trusted(false)
1642 {
1643    Retries = _config->FindI("Acquire::Retries",0);
1644
1645    if (Version.Arch() == 0)
1646    {
1647       _error->Error(_("I wasn't able to locate a file for the %s package. "
1648                       "This might mean you need to manually fix this package. "
1649                       "(due to missing arch)"),
1650                     Version.ParentPkg().Name());
1651       return;
1652    }
1653
1654    /* We need to find a filename to determine the extension. We make the
1655       assumption here that all the available sources for this version share
1656       the same extension.. */
1657    // Skip not source sources, they do not have file fields.
1658    for (; Vf.end() == false; Vf++)
1659    {
1660       if ((Vf.File()->Flags & pkgCache::Flag::NotSource) != 0)
1661          continue;
1662       break;
1663    }
1664
1665    // Does not really matter here.. we are going to fail out below
1666    if (Vf.end() != true)
1667    {
1668       // If this fails to get a file name we will bomb out below.
1669       pkgRecords::Parser &Parse = Recs->Lookup(Vf);
1670       if (_error->PendingError() == true)
1671          return;
1672
1673       // Generate the final file name as: package_version_arch.foo
1674       StoreFilename = QuoteString(Version.ParentPkg().Name(),"_:") + '_' +
1675                       QuoteString(Version.VerStr(),"_:") + '_' +
1676                       QuoteString(Version.Arch(),"_:.") +
1677                       "." + flExtension(Parse.FileName());
1678    }
1679
1680    // check if we have one trusted source for the package. if so, switch
1681    // to "TrustedOnly" mode
1682    for (pkgCache::VerFileIterator i = Version.FileList(); i.end() == false; ++i)
1683    {
1684       pkgIndexFile *Index;
1685       if (Sources->FindIndex(i.File(),Index) == false)
1686          continue;
1687       if (_config->FindB("Debug::pkgAcquire::Auth", false))
1688       {
1689          std::cerr << "Checking index: " << Index->Describe()
1690                    << "(Trusted=" << Index->IsTrusted() << ")\n";
1691       }
1692       if (Index->IsTrusted()) {
1693          Trusted = true;
1694          break;
1695       }
1696    }
1697
1698    // "allow-unauthenticated" restores apts old fetching behaviour
1699    // that means that e.g. unauthenticated file:// uris are higher
1700    // priority than authenticated http:// uris
1701    if (_config->FindB("APT::Get::AllowUnauthenticated",false) == true)
1702       Trusted = false;
1703
1704    // Select a source
1705    if (QueueNext() == false && _error->PendingError() == false)
1706       _error->Error(_("I wasn't able to locate a file for the %s package. "
1707                     "This might mean you need to manually fix this package."),
1708                     Version.ParentPkg().Name());
1709 }
1710                                                                         /*}}}*/
1711 // AcqArchive::QueueNext - Queue the next file source                   /*{{{*/
1712 // ---------------------------------------------------------------------
1713 /* This queues the next available file version for download. It checks if
1714    the archive is already available in the cache and stashs the MD5 for
1715    checking later. */
1716 bool pkgAcqArchive::QueueNext()
1717 {
1718    string const ForceHash = _config->Find("Acquire::ForceHash");
1719    for (; Vf.end() == false; ++Vf)
1720    {
1721       // Ignore not source sources
1722       if ((Vf.File()->Flags & pkgCache::Flag::NotSource) != 0)
1723          continue;
1724
1725       // Try to cross match against the source list
1726       pkgIndexFile *Index;
1727       if (Sources->FindIndex(Vf.File(),Index) == false)
1728             continue;
1729
1730       // only try to get a trusted package from another source if that source
1731       // is also trusted
1732       if(Trusted && !Index->IsTrusted())
1733          continue;
1734
1735       // Grab the text package record
1736       pkgRecords::Parser &Parse = Recs->Lookup(Vf);
1737       if (_error->PendingError() == true)
1738          return false;
1739
1740       string PkgFile = Parse.FileName();
1741       if (ForceHash.empty() == false)
1742       {
1743          if(stringcasecmp(ForceHash, "sha512") == 0)
1744             ExpectedHash = HashString("SHA512", Parse.SHA512Hash());
1745          if(stringcasecmp(ForceHash, "sha256") == 0)
1746             ExpectedHash = HashString("SHA256", Parse.SHA256Hash());
1747          else if (stringcasecmp(ForceHash, "sha1") == 0)
1748             ExpectedHash = HashString("SHA1", Parse.SHA1Hash());
1749          else
1750             ExpectedHash = HashString("MD5Sum", Parse.MD5Hash());
1751       }
1752       else
1753       {
1754          string Hash;
1755          if ((Hash = Parse.SHA512Hash()).empty() == false)
1756             ExpectedHash = HashString("SHA512", Hash);
1757          else if ((Hash = Parse.SHA256Hash()).empty() == false)
1758             ExpectedHash = HashString("SHA256", Hash);
1759          else if ((Hash = Parse.SHA1Hash()).empty() == false)
1760             ExpectedHash = HashString("SHA1", Hash);
1761          else
1762             ExpectedHash = HashString("MD5Sum", Parse.MD5Hash());
1763       }
1764       if (PkgFile.empty() == true)
1765          return _error->Error(_("The package index files are corrupted. No Filename: "
1766                               "field for package %s."),
1767                               Version.ParentPkg().Name());
1768
1769       Desc.URI = Index->ArchiveURI(PkgFile);
1770       Desc.Description = Index->ArchiveInfo(Version);
1771       Desc.Owner = this;
1772       Desc.ShortDesc = Version.ParentPkg().Name();
1773
1774       // See if we already have the file. (Legacy filenames)
1775       FileSize = Version->Size;
1776       string FinalFile = _config->FindDir("Dir::Cache::Archives") + flNotDir(PkgFile);
1777       struct stat Buf;
1778       if (stat(FinalFile.c_str(),&Buf) == 0)
1779       {
1780          // Make sure the size matches
1781          if ((unsigned long long)Buf.st_size == Version->Size)
1782          {
1783             Complete = true;
1784             Local = true;
1785             Status = StatDone;
1786             StoreFilename = DestFile = FinalFile;
1787             return true;
1788          }
1789
1790          /* Hmm, we have a file and its size does not match, this means it is
1791             an old style mismatched arch */
1792          unlink(FinalFile.c_str());
1793       }
1794
1795       // Check it again using the new style output filenames
1796       FinalFile = _config->FindDir("Dir::Cache::Archives") + flNotDir(StoreFilename);
1797       if (stat(FinalFile.c_str(),&Buf) == 0)
1798       {
1799          // Make sure the size matches
1800          if ((unsigned long long)Buf.st_size == Version->Size)
1801          {
1802             Complete = true;
1803             Local = true;
1804             Status = StatDone;
1805             StoreFilename = DestFile = FinalFile;
1806             return true;
1807          }
1808
1809          /* Hmm, we have a file and its size does not match, this shouldnt
1810             happen.. */
1811          unlink(FinalFile.c_str());
1812       }
1813
1814       DestFile = _config->FindDir("Dir::Cache::Archives") + "partial/" + flNotDir(StoreFilename);
1815
1816       // Check the destination file
1817       if (stat(DestFile.c_str(),&Buf) == 0)
1818       {
1819          // Hmm, the partial file is too big, erase it
1820          if ((unsigned long long)Buf.st_size > Version->Size)
1821             unlink(DestFile.c_str());
1822          else
1823             PartialSize = Buf.st_size;
1824       }
1825
1826       // Disables download of archives - useful if no real installation follows,
1827       // e.g. if we are just interested in proposed installation order
1828       if (_config->FindB("Debug::pkgAcqArchive::NoQueue", false) == true)
1829       {
1830          Complete = true;
1831          Local = true;
1832          Status = StatDone;
1833          StoreFilename = DestFile = FinalFile;
1834          return true;
1835       }
1836
1837       // Create the item
1838       Local = false;
1839       Desc.URI = Index->ArchiveURI(PkgFile);
1840       Desc.Description = Index->ArchiveInfo(Version);
1841       Desc.Owner = this;
1842       Desc.ShortDesc = Version.ParentPkg().Name();
1843       QueueURI(Desc);
1844
1845       ++Vf;
1846       return true;
1847    }
1848    return false;
1849 }
1850                                                                         /*}}}*/
1851 // AcqArchive::Done - Finished fetching                                 /*{{{*/
1852 // ---------------------------------------------------------------------
1853 /* */
1854 void pkgAcqArchive::Done(string Message,unsigned long long Size,string CalcHash,
1855                          pkgAcquire::MethodConfig *Cfg)
1856 {
1857    Item::Done(Message,Size,CalcHash,Cfg);
1858
1859    // Check the size
1860    if (Size != Version->Size)
1861    {
1862       Status = StatError;
1863       ErrorText = _("Size mismatch");
1864       return;
1865    }
1866
1867    // Check the hash
1868    if(ExpectedHash.toStr() != CalcHash)
1869    {
1870       Status = StatError;
1871       ErrorText = _("Hash Sum mismatch");
1872       if(FileExists(DestFile))
1873          Rename(DestFile,DestFile + ".FAILED");
1874       return;
1875    }
1876
1877    // Grab the output filename
1878    string FileName = LookupTag(Message,"Filename");
1879    if (FileName.empty() == true)
1880    {
1881       Status = StatError;
1882       ErrorText = "Method gave a blank filename";
1883       return;
1884    }
1885
1886    Complete = true;
1887
1888    // Reference filename
1889    if (FileName != DestFile)
1890    {
1891       StoreFilename = DestFile = FileName;
1892       Local = true;
1893       return;
1894    }
1895
1896    // Done, move it into position
1897    string FinalFile = _config->FindDir("Dir::Cache::Archives");
1898    FinalFile += flNotDir(StoreFilename);
1899    Rename(DestFile,FinalFile);
1900
1901    StoreFilename = DestFile = FinalFile;
1902    Complete = true;
1903 }
1904                                                                         /*}}}*/
1905 // AcqArchive::Failed - Failure handler                                 /*{{{*/
1906 // ---------------------------------------------------------------------
1907 /* Here we try other sources */
1908 void pkgAcqArchive::Failed(string Message,pkgAcquire::MethodConfig *Cnf)
1909 {
1910    ErrorText = LookupTag(Message,"Message");
1911
1912    /* We don't really want to retry on failed media swaps, this prevents
1913       that. An interesting observation is that permanent failures are not
1914       recorded. */
1915    if (Cnf->Removable == true &&
1916        StringToBool(LookupTag(Message,"Transient-Failure"),false) == true)
1917    {
1918       // Vf = Version.FileList();
1919       while (Vf.end() == false) ++Vf;
1920       StoreFilename = string();
1921       Item::Failed(Message,Cnf);
1922       return;
1923    }
1924
1925    if (QueueNext() == false)
1926    {
1927       // This is the retry counter
1928       if (Retries != 0 &&
1929           Cnf->LocalOnly == false &&
1930           StringToBool(LookupTag(Message,"Transient-Failure"),false) == true)
1931       {
1932          Retries--;
1933          Vf = Version.FileList();
1934          if (QueueNext() == true)
1935             return;
1936       }
1937
1938       StoreFilename = string();
1939       Item::Failed(Message,Cnf);
1940    }
1941 }
1942                                                                         /*}}}*/
1943 // AcqArchive::IsTrusted - Determine whether this archive comes from a trusted source /*{{{*/
1944 // ---------------------------------------------------------------------
1945 bool pkgAcqArchive::IsTrusted()
1946 {
1947    return Trusted;
1948 }
1949                                                                         /*}}}*/
1950 // AcqArchive::Finished - Fetching has finished, tidy up                /*{{{*/
1951 // ---------------------------------------------------------------------
1952 /* */
1953 void pkgAcqArchive::Finished()
1954 {
1955    if (Status == pkgAcquire::Item::StatDone &&
1956        Complete == true)
1957       return;
1958    StoreFilename = string();
1959 }
1960                                                                         /*}}}*/
1961 // AcqFile::pkgAcqFile - Constructor                                    /*{{{*/
1962 // ---------------------------------------------------------------------
1963 /* The file is added to the queue */
1964 pkgAcqFile::pkgAcqFile(pkgAcquire *Owner,string URI,string Hash,
1965                        unsigned long long Size,string Dsc,string ShortDesc,
1966                        const string &DestDir, const string &DestFilename,
1967                        bool IsIndexFile) :
1968                        Item(Owner), ExpectedHash(Hash), IsIndexFile(IsIndexFile)
1969 {
1970    Retries = _config->FindI("Acquire::Retries",0);
1971
1972    if(!DestFilename.empty())
1973       DestFile = DestFilename;
1974    else if(!DestDir.empty())
1975       DestFile = DestDir + "/" + flNotDir(URI);
1976    else
1977       DestFile = flNotDir(URI);
1978
1979    // Create the item
1980    Desc.URI = URI;
1981    Desc.Description = Dsc;
1982    Desc.Owner = this;
1983
1984    // Set the short description to the archive component
1985    Desc.ShortDesc = ShortDesc;
1986
1987    // Get the transfer sizes
1988    FileSize = Size;
1989    struct stat Buf;
1990    if (stat(DestFile.c_str(),&Buf) == 0)
1991    {
1992       // Hmm, the partial file is too big, erase it
1993       if ((unsigned long long)Buf.st_size > Size)
1994          unlink(DestFile.c_str());
1995       else
1996          PartialSize = Buf.st_size;
1997    }
1998
1999    QueueURI(Desc);
2000 }
2001                                                                         /*}}}*/
2002 // AcqFile::Done - Item downloaded OK                                   /*{{{*/
2003 // ---------------------------------------------------------------------
2004 /* */
2005 void pkgAcqFile::Done(string Message,unsigned long long Size,string CalcHash,
2006                       pkgAcquire::MethodConfig *Cnf)
2007 {
2008    Item::Done(Message,Size,CalcHash,Cnf);
2009
2010    // Check the hash
2011    if(!ExpectedHash.empty() && ExpectedHash.toStr() != CalcHash)
2012    {
2013       Status = StatError;
2014       ErrorText = _("Hash Sum mismatch");
2015       Rename(DestFile,DestFile + ".FAILED");
2016       return;
2017    }
2018
2019    string FileName = LookupTag(Message,"Filename");
2020    if (FileName.empty() == true)
2021    {
2022       Status = StatError;
2023       ErrorText = "Method gave a blank filename";
2024       return;
2025    }
2026
2027    Complete = true;
2028
2029    // The files timestamp matches
2030    if (StringToBool(LookupTag(Message,"IMS-Hit"),false) == true)
2031       return;
2032
2033    // We have to copy it into place
2034    if (FileName != DestFile)
2035    {
2036       Local = true;
2037       if (_config->FindB("Acquire::Source-Symlinks",true) == false ||
2038           Cnf->Removable == true)
2039       {
2040          Desc.URI = "copy:" + FileName;
2041          QueueURI(Desc);
2042          return;
2043       }
2044
2045       // Erase the file if it is a symlink so we can overwrite it
2046       struct stat St;
2047       if (lstat(DestFile.c_str(),&St) == 0)
2048       {
2049          if (S_ISLNK(St.st_mode) != 0)
2050             unlink(DestFile.c_str());
2051       }
2052
2053       // Symlink the file
2054       if (symlink(FileName.c_str(),DestFile.c_str()) != 0)
2055       {
2056          ErrorText = "Link to " + DestFile + " failure ";
2057          Status = StatError;
2058          Complete = false;
2059       }
2060    }
2061 }
2062                                                                         /*}}}*/
2063 // AcqFile::Failed - Failure handler                                    /*{{{*/
2064 // ---------------------------------------------------------------------
2065 /* Here we try other sources */
2066 void pkgAcqFile::Failed(string Message,pkgAcquire::MethodConfig *Cnf)
2067 {
2068    ErrorText = LookupTag(Message,"Message");
2069
2070    // This is the retry counter
2071    if (Retries != 0 &&
2072        Cnf->LocalOnly == false &&
2073        StringToBool(LookupTag(Message,"Transient-Failure"),false) == true)
2074    {
2075       Retries--;
2076       QueueURI(Desc);
2077       return;
2078    }
2079
2080    Item::Failed(Message,Cnf);
2081 }
2082                                                                         /*}}}*/
2083 // AcqIndex::Custom600Headers - Insert custom request headers           /*{{{*/
2084 // ---------------------------------------------------------------------
2085 /* The only header we use is the last-modified header. */
2086 string pkgAcqFile::Custom600Headers()
2087 {
2088    if (IsIndexFile)
2089       return "\nIndex-File: true";
2090    return "";
2091 }
2092                                                                         /*}}}*/