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.empty() == true)
 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    if (RealFileExists(Final) == true)
1071    {
1072       // File was already in place.  It needs to be re-downloaded/verified
1073       // because Release might have changed, we do give it a differnt
1074       // name than DestFile because otherwise the http method will
1075       // send If-Range requests and there are too many broken servers
1076       // out there that do not understand them
1077       LastGoodSig = DestFile+".reverify";
1078       Rename(Final,LastGoodSig);
1079    }
1080
1081    QueueURI(Desc);
1082 }
1083                                                                         /*}}}*/
1084 pkgAcqMetaSig::~pkgAcqMetaSig()                                         /*{{{*/
1085 {
1086    // if the file was never queued undo file-changes done in the constructor
1087    if (QueueCounter == 1 && Status == StatIdle && FileSize == 0 && Complete == false &&
1088          LastGoodSig.empty() == false)
1089    {
1090       string const Final = _config->FindDir("Dir::State::lists") + URItoFileName(RealURI);
1091       if (RealFileExists(Final) == false && RealFileExists(LastGoodSig) == true)
1092          Rename(LastGoodSig, Final);
1093    }
1094
1095 }
1096                                                                         /*}}}*/
1097 // pkgAcqMetaSig::Custom600Headers - Insert custom request headers      /*{{{*/
1098 // ---------------------------------------------------------------------
1099 /* The only header we use is the last-modified header. */
1100 string pkgAcqMetaSig::Custom600Headers()
1101 {
1102    struct stat Buf;
1103    if (stat(LastGoodSig.c_str(),&Buf) != 0)
1104       return "\nIndex-File: true";
1105
1106    return "\nIndex-File: true\nLast-Modified: " + TimeRFC1123(Buf.st_mtime);
1107 }
1108
1109 void pkgAcqMetaSig::Done(string Message,unsigned long long Size,string MD5,
1110                          pkgAcquire::MethodConfig *Cfg)
1111 {
1112    Item::Done(Message,Size,MD5,Cfg);
1113
1114    string FileName = LookupTag(Message,"Filename");
1115    if (FileName.empty() == true)
1116    {
1117       Status = StatError;
1118       ErrorText = "Method gave a blank filename";
1119       return;
1120    }
1121
1122    if (FileName != DestFile)
1123    {
1124       // We have to copy it into place
1125       Local = true;
1126       Desc.URI = "copy:" + FileName;
1127       QueueURI(Desc);
1128       return;
1129    }
1130
1131    Complete = true;
1132
1133    // put the last known good file back on i-m-s hit (it will
1134    // be re-verified again)
1135    // Else do nothing, we have the new file in DestFile then
1136    if(StringToBool(LookupTag(Message,"IMS-Hit"),false) == true)
1137       Rename(LastGoodSig, DestFile);
1138
1139    // queue a pkgAcqMetaIndex to be verified against the sig we just retrieved
1140    new pkgAcqMetaIndex(Owner, MetaIndexURI, MetaIndexURIDesc,
1141                        MetaIndexShortDesc,  DestFile, IndexTargets,
1142                        MetaIndexParser);
1143
1144 }
1145                                                                         /*}}}*/
1146 void pkgAcqMetaSig::Failed(string Message,pkgAcquire::MethodConfig *Cnf)/*{{{*/
1147 {
1148    string Final = _config->FindDir("Dir::State::lists") + URItoFileName(RealURI);
1149
1150    // if we get a network error we fail gracefully
1151    if(Status == StatTransientNetworkError)
1152    {
1153       Item::Failed(Message,Cnf);
1154       // move the sigfile back on transient network failures
1155       if(FileExists(LastGoodSig))
1156          Rename(LastGoodSig,Final);
1157
1158       // set the status back to , Item::Failed likes to reset it
1159       Status = pkgAcquire::Item::StatTransientNetworkError;
1160       return;
1161    }
1162
1163    // Delete any existing sigfile when the acquire failed
1164    unlink(Final.c_str());
1165
1166    // queue a pkgAcqMetaIndex with no sigfile
1167    new pkgAcqMetaIndex(Owner, MetaIndexURI, MetaIndexURIDesc, MetaIndexShortDesc,
1168                        "", IndexTargets, MetaIndexParser);
1169
1170    if (Cnf->LocalOnly == true ||
1171        StringToBool(LookupTag(Message,"Transient-Failure"),false) == false)
1172    {
1173       // Ignore this
1174       Status = StatDone;
1175       Complete = false;
1176       Dequeue();
1177       return;
1178    }
1179
1180    Item::Failed(Message,Cnf);
1181 }
1182                                                                         /*}}}*/
1183 pkgAcqMetaIndex::pkgAcqMetaIndex(pkgAcquire *Owner,                     /*{{{*/
1184                                  string URI,string URIDesc,string ShortDesc,
1185                                  string SigFile,
1186                                  const vector<struct IndexTarget*>* IndexTargets,
1187                                  indexRecords* MetaIndexParser) :
1188    Item(Owner), RealURI(URI), SigFile(SigFile), IndexTargets(IndexTargets),
1189    MetaIndexParser(MetaIndexParser), AuthPass(false), IMSHit(false)
1190 {
1191    DestFile = _config->FindDir("Dir::State::lists") + "partial/";
1192    DestFile += URItoFileName(URI);
1193
1194    // Create the item
1195    Desc.Description = URIDesc;
1196    Desc.Owner = this;
1197    Desc.ShortDesc = ShortDesc;
1198    Desc.URI = URI;
1199
1200    QueueURI(Desc);
1201 }
1202                                                                         /*}}}*/
1203 // pkgAcqMetaIndex::Custom600Headers - Insert custom request headers    /*{{{*/
1204 // ---------------------------------------------------------------------
1205 /* The only header we use is the last-modified header. */
1206 string pkgAcqMetaIndex::Custom600Headers()
1207 {
1208    string Final = _config->FindDir("Dir::State::lists");
1209    Final += URItoFileName(RealURI);
1210
1211    struct stat Buf;
1212    if (stat(Final.c_str(),&Buf) != 0)
1213       return "\nIndex-File: true";
1214
1215    return "\nIndex-File: true\nLast-Modified: " + TimeRFC1123(Buf.st_mtime);
1216 }
1217                                                                         /*}}}*/
1218 void pkgAcqMetaIndex::Done(string Message,unsigned long long Size,string Hash,  /*{{{*/
1219                            pkgAcquire::MethodConfig *Cfg)
1220 {
1221    Item::Done(Message,Size,Hash,Cfg);
1222
1223    // MetaIndexes are done in two passes: one to download the
1224    // metaindex with an appropriate method, and a second to verify it
1225    // with the gpgv method
1226
1227    if (AuthPass == true)
1228    {
1229       AuthDone(Message);
1230
1231       // all cool, move Release file into place
1232       Complete = true;
1233    }
1234    else
1235    {
1236       RetrievalDone(Message);
1237       if (!Complete)
1238          // Still more retrieving to do
1239          return;
1240
1241       if (SigFile == "")
1242       {
1243          // There was no signature file, so we are finished.  Download
1244          // the indexes and do only hashsum verification if possible
1245          MetaIndexParser->Load(DestFile);
1246          QueueIndexes(false);
1247       }
1248       else
1249       {
1250          // FIXME: move this into pkgAcqMetaClearSig::Done on the next
1251          //        ABI break
1252
1253          // if we expect a ClearTextSignature (InRelase), ensure that
1254          // this is what we get and if not fail to queue a
1255          // Release/Release.gpg, see #346386
1256          if (SigFile == DestFile && !StartsWithGPGClearTextSignature(DestFile))
1257          {
1258             Failed(Message, Cfg);
1259             return;
1260          }
1261
1262          // There was a signature file, so pass it to gpgv for
1263          // verification
1264          if (_config->FindB("Debug::pkgAcquire::Auth", false))
1265             std::cerr << "Metaindex acquired, queueing gpg verification ("
1266                       << SigFile << "," << DestFile << ")\n";
1267          AuthPass = true;
1268          Desc.URI = "gpgv:" + SigFile;
1269          QueueURI(Desc);
1270          Mode = "gpgv";
1271          return;
1272       }
1273    }
1274
1275    if (Complete == true)
1276    {
1277       string FinalFile = _config->FindDir("Dir::State::lists");
1278       FinalFile += URItoFileName(RealURI);
1279       if (SigFile == DestFile)
1280          SigFile = FinalFile;
1281       Rename(DestFile,FinalFile);
1282       chmod(FinalFile.c_str(),0644);
1283       DestFile = FinalFile;
1284    }
1285 }
1286                                                                         /*}}}*/
1287 void pkgAcqMetaIndex::RetrievalDone(string Message)                     /*{{{*/
1288 {
1289    // We have just finished downloading a Release file (it is not
1290    // verified yet)
1291
1292    string FileName = LookupTag(Message,"Filename");
1293    if (FileName.empty() == true)
1294    {
1295       Status = StatError;
1296       ErrorText = "Method gave a blank filename";
1297       return;
1298    }
1299
1300    if (FileName != DestFile)
1301    {
1302       Local = true;
1303       Desc.URI = "copy:" + FileName;
1304       QueueURI(Desc);
1305       return;
1306    }
1307
1308    // make sure to verify against the right file on I-M-S hit
1309    IMSHit = StringToBool(LookupTag(Message,"IMS-Hit"),false);
1310    if(IMSHit)
1311    {
1312       string FinalFile = _config->FindDir("Dir::State::lists");
1313       FinalFile += URItoFileName(RealURI);
1314       if (SigFile == DestFile)
1315       {
1316          SigFile = FinalFile;
1317          // constructor of pkgAcqMetaClearSig moved it out of the way,
1318          // now move it back in on IMS hit for the 'old' file
1319          string const OldClearSig = DestFile + ".reverify";
1320          if (RealFileExists(OldClearSig) == true)
1321             Rename(OldClearSig, FinalFile);
1322       }
1323       DestFile = FinalFile;
1324    }
1325    Complete = true;
1326 }
1327                                                                         /*}}}*/
1328 void pkgAcqMetaIndex::AuthDone(string Message)                          /*{{{*/
1329 {
1330    // At this point, the gpgv method has succeeded, so there is a
1331    // valid signature from a key in the trusted keyring.  We
1332    // perform additional verification of its contents, and use them
1333    // to verify the indexes we are about to download
1334
1335    if (!MetaIndexParser->Load(DestFile))
1336    {
1337       Status = StatAuthError;
1338       ErrorText = MetaIndexParser->ErrorText;
1339       return;
1340    }
1341
1342    if (!VerifyVendor(Message))
1343    {
1344       return;
1345    }
1346
1347    if (_config->FindB("Debug::pkgAcquire::Auth", false))
1348       std::cerr << "Signature verification succeeded: "
1349                 << DestFile << std::endl;
1350
1351    // Download further indexes with verification
1352    QueueIndexes(true);
1353
1354    // is it a clearsigned MetaIndex file?
1355    if (DestFile == SigFile)
1356       return;
1357
1358    // Done, move signature file into position
1359    string VerifiedSigFile = _config->FindDir("Dir::State::lists") +
1360       URItoFileName(RealURI) + ".gpg";
1361    Rename(SigFile,VerifiedSigFile);
1362    chmod(VerifiedSigFile.c_str(),0644);
1363 }
1364                                                                         /*}}}*/
1365 void pkgAcqMetaIndex::QueueIndexes(bool verify)                         /*{{{*/
1366 {
1367 #if 0
1368    /* Reject invalid, existing Release files (LP: #346386) (Closes: #627642)
1369     * FIXME: Disabled; it breaks unsigned repositories without hashes */
1370    if (!verify && FileExists(DestFile) && !MetaIndexParser->Load(DestFile))
1371    {
1372       Status = StatError;
1373       ErrorText = MetaIndexParser->ErrorText;
1374       return;
1375    }
1376 #endif
1377    bool transInRelease = false;
1378    {
1379       std::vector<std::string> const keys = MetaIndexParser->MetaKeys();
1380       for (std::vector<std::string>::const_iterator k = keys.begin(); k != keys.end(); ++k)
1381          // FIXME: Feels wrong to check for hardcoded string here, but what should we do else…
1382          if (k->find("Translation-") != std::string::npos)
1383          {
1384             transInRelease = true;
1385             break;
1386          }
1387    }
1388
1389    for (vector <struct IndexTarget*>::const_iterator Target = IndexTargets->begin();
1390         Target != IndexTargets->end();
1391         ++Target)
1392    {
1393       HashString ExpectedIndexHash;
1394       const indexRecords::checkSum *Record = MetaIndexParser->Lookup((*Target)->MetaKey);
1395       bool compressedAvailable = false;
1396       if (Record == NULL)
1397       {
1398          if ((*Target)->IsOptional() == true)
1399          {
1400             std::vector<std::string> types = APT::Configuration::getCompressionTypes();
1401             for (std::vector<std::string>::const_iterator t = types.begin(); t != types.end(); ++t)
1402                if (MetaIndexParser->Exists(string((*Target)->MetaKey).append(".").append(*t)) == true)
1403                {
1404                   compressedAvailable = true;
1405                   break;
1406                }
1407          }
1408          else if (verify == true)
1409          {
1410             Status = StatAuthError;
1411             strprintf(ErrorText, _("Unable to find expected entry '%s' in Release file (Wrong sources.list entry or malformed file)"), (*Target)->MetaKey.c_str());
1412             return;
1413          }
1414       }
1415       else
1416       {
1417          ExpectedIndexHash = Record->Hash;
1418          if (_config->FindB("Debug::pkgAcquire::Auth", false))
1419          {
1420             std::cerr << "Queueing: " << (*Target)->URI << std::endl;
1421             std::cerr << "Expected Hash: " << ExpectedIndexHash.toStr() << std::endl;
1422             std::cerr << "For: " << Record->MetaKeyFilename << std::endl;
1423          }
1424          if (verify == true && ExpectedIndexHash.empty() == true && (*Target)->IsOptional() == false)
1425          {
1426             Status = StatAuthError;
1427             strprintf(ErrorText, _("Unable to find hash sum for '%s' in Release file"), (*Target)->MetaKey.c_str());
1428             return;
1429          }
1430       }
1431
1432       if ((*Target)->IsOptional() == true)
1433       {
1434          if ((*Target)->IsSubIndex() == true)
1435             new pkgAcqSubIndex(Owner, (*Target)->URI, (*Target)->Description,
1436                                 (*Target)->ShortDesc, ExpectedIndexHash);
1437          else if (transInRelease == false || Record != NULL || compressedAvailable == true)
1438          {
1439             if (_config->FindB("Acquire::PDiffs",true) == true && transInRelease == true &&
1440                 MetaIndexParser->Exists(string((*Target)->MetaKey).append(".diff/Index")) == true)
1441                new pkgAcqDiffIndex(Owner, (*Target)->URI, (*Target)->Description,
1442                                    (*Target)->ShortDesc, ExpectedIndexHash);
1443             else
1444                new pkgAcqIndexTrans(Owner, *Target, ExpectedIndexHash, MetaIndexParser);
1445          }
1446          continue;
1447       }
1448
1449       /* Queue Packages file (either diff or full packages files, depending
1450          on the users option) - we also check if the PDiff Index file is listed
1451          in the Meta-Index file. Ideal would be if pkgAcqDiffIndex would test this
1452          instead, but passing the required info to it is to much hassle */
1453       if(_config->FindB("Acquire::PDiffs",true) == true && (verify == false ||
1454           MetaIndexParser->Exists(string((*Target)->MetaKey).append(".diff/Index")) == true))
1455          new pkgAcqDiffIndex(Owner, (*Target)->URI, (*Target)->Description,
1456                              (*Target)->ShortDesc, ExpectedIndexHash);
1457       else
1458          new pkgAcqIndex(Owner, *Target, ExpectedIndexHash, MetaIndexParser);
1459    }
1460 }
1461                                                                         /*}}}*/
1462 bool pkgAcqMetaIndex::VerifyVendor(string Message)                      /*{{{*/
1463 {
1464    string::size_type pos;
1465
1466    // check for missing sigs (that where not fatal because otherwise we had
1467    // bombed earlier)
1468    string missingkeys;
1469    string msg = _("There is no public key available for the "
1470                   "following key IDs:\n");
1471    pos = Message.find("NO_PUBKEY ");
1472    if (pos != std::string::npos)
1473    {
1474       string::size_type start = pos+strlen("NO_PUBKEY ");
1475       string Fingerprint = Message.substr(start, Message.find("\n")-start);
1476       missingkeys += (Fingerprint);
1477    }
1478    if(!missingkeys.empty())
1479       _error->Warning("%s", string(msg+missingkeys).c_str());
1480
1481    string Transformed = MetaIndexParser->GetExpectedDist();
1482
1483    if (Transformed == "../project/experimental")
1484    {
1485       Transformed = "experimental";
1486    }
1487
1488    pos = Transformed.rfind('/');
1489    if (pos != string::npos)
1490    {
1491       Transformed = Transformed.substr(0, pos);
1492    }
1493
1494    if (Transformed == ".")
1495    {
1496       Transformed = "";
1497    }
1498
1499    if (_config->FindB("Acquire::Check-Valid-Until", true) == true &&
1500        MetaIndexParser->GetValidUntil() > 0) {
1501       time_t const invalid_since = time(NULL) - MetaIndexParser->GetValidUntil();
1502       if (invalid_since > 0)
1503          // TRANSLATOR: The first %s is the URL of the bad Release file, the second is
1504          // the time since then the file is invalid - formated in the same way as in
1505          // the download progress display (e.g. 7d 3h 42min 1s)
1506          return _error->Error(
1507             _("Release file for %s is expired (invalid since %s). "
1508               "Updates for this repository will not be applied."),
1509             RealURI.c_str(), TimeToStr(invalid_since).c_str());
1510    }
1511
1512    if (_config->FindB("Debug::pkgAcquire::Auth", false))
1513    {
1514       std::cerr << "Got Codename: " << MetaIndexParser->GetDist() << std::endl;
1515       std::cerr << "Expecting Dist: " << MetaIndexParser->GetExpectedDist() << std::endl;
1516       std::cerr << "Transformed Dist: " << Transformed << std::endl;
1517    }
1518
1519    if (MetaIndexParser->CheckDist(Transformed) == false)
1520    {
1521       // This might become fatal one day
1522 //       Status = StatAuthError;
1523 //       ErrorText = "Conflicting distribution; expected "
1524 //          + MetaIndexParser->GetExpectedDist() + " but got "
1525 //          + MetaIndexParser->GetDist();
1526 //       return false;
1527       if (!Transformed.empty())
1528       {
1529          _error->Warning(_("Conflicting distribution: %s (expected %s but got %s)"),
1530                          Desc.Description.c_str(),
1531                          Transformed.c_str(),
1532                          MetaIndexParser->GetDist().c_str());
1533       }
1534    }
1535
1536    return true;
1537 }
1538                                                                         /*}}}*/
1539 // pkgAcqMetaIndex::Failed - no Release file present or no signature file present       /*{{{*/
1540 // ---------------------------------------------------------------------
1541 /* */
1542 void pkgAcqMetaIndex::Failed(string Message,pkgAcquire::MethodConfig *Cnf)
1543 {
1544    if (AuthPass == true)
1545    {
1546       // gpgv method failed, if we have a good signature
1547       string LastGoodSigFile = _config->FindDir("Dir::State::lists").append("partial/").append(URItoFileName(RealURI));
1548       if (DestFile != SigFile)
1549          LastGoodSigFile.append(".gpg");
1550       LastGoodSigFile.append(".reverify");
1551
1552       if(FileExists(LastGoodSigFile))
1553       {
1554          string VerifiedSigFile = _config->FindDir("Dir::State::lists") + URItoFileName(RealURI);
1555          if (DestFile != SigFile)
1556             VerifiedSigFile.append(".gpg");
1557          Rename(LastGoodSigFile, VerifiedSigFile);
1558          Status = StatTransientNetworkError;
1559          _error->Warning(_("An error occurred during the signature "
1560                            "verification. The repository is not updated "
1561                            "and the previous index files will be used. "
1562                            "GPG error: %s: %s\n"),
1563                          Desc.Description.c_str(),
1564                          LookupTag(Message,"Message").c_str());
1565          RunScripts("APT::Update::Auth-Failure");
1566          return;
1567       } else if (LookupTag(Message,"Message").find("NODATA") != string::npos) {
1568          /* Invalid signature file, reject (LP: #346386) (Closes: #627642) */
1569          _error->Error(_("GPG error: %s: %s"),
1570                          Desc.Description.c_str(),
1571                          LookupTag(Message,"Message").c_str());
1572          return;
1573       } else {
1574          _error->Warning(_("GPG error: %s: %s"),
1575                          Desc.Description.c_str(),
1576                          LookupTag(Message,"Message").c_str());
1577       }
1578       // gpgv method failed
1579       ReportMirrorFailure("GPGFailure");
1580    }
1581
1582    /* Always move the meta index, even if gpgv failed. This ensures
1583     * that PackageFile objects are correctly filled in */
1584    if (FileExists(DestFile)) {
1585       string FinalFile = _config->FindDir("Dir::State::lists");
1586       FinalFile += URItoFileName(RealURI);
1587       /* InRelease files become Release files, otherwise
1588        * they would be considered as trusted later on */
1589       if (SigFile == DestFile) {
1590          RealURI = RealURI.replace(RealURI.rfind("InRelease"), 9,
1591                                        "Release");
1592          FinalFile = FinalFile.replace(FinalFile.rfind("InRelease"), 9,
1593                                        "Release");
1594          SigFile = FinalFile;
1595       }
1596       Rename(DestFile,FinalFile);
1597       chmod(FinalFile.c_str(),0644);
1598
1599       DestFile = FinalFile;
1600    }
1601
1602    // No Release file was present, or verification failed, so fall
1603    // back to queueing Packages files without verification
1604    QueueIndexes(false);
1605 }
1606                                                                         /*}}}*/
1607 pkgAcqMetaClearSig::pkgAcqMetaClearSig(pkgAcquire *Owner,               /*{{{*/
1608                 string const &URI, string const &URIDesc, string const &ShortDesc,
1609                 string const &MetaIndexURI, string const &MetaIndexURIDesc, string const &MetaIndexShortDesc,
1610                 string const &MetaSigURI, string const &MetaSigURIDesc, string const &MetaSigShortDesc,
1611                 const vector<struct IndexTarget*>* IndexTargets,
1612                 indexRecords* MetaIndexParser) :
1613         pkgAcqMetaIndex(Owner, URI, URIDesc, ShortDesc, "", IndexTargets, MetaIndexParser),
1614         MetaIndexURI(MetaIndexURI), MetaIndexURIDesc(MetaIndexURIDesc), MetaIndexShortDesc(MetaIndexShortDesc),
1615         MetaSigURI(MetaSigURI), MetaSigURIDesc(MetaSigURIDesc), MetaSigShortDesc(MetaSigShortDesc)
1616 {
1617    SigFile = DestFile;
1618
1619    // keep the old InRelease around in case of transistent network errors
1620    string const Final = _config->FindDir("Dir::State::lists") + URItoFileName(RealURI);
1621    if (RealFileExists(Final) == true)
1622    {
1623       string const LastGoodSig = DestFile + ".reverify";
1624       Rename(Final,LastGoodSig);
1625    }
1626 }
1627                                                                         /*}}}*/
1628 pkgAcqMetaClearSig::~pkgAcqMetaClearSig()                               /*{{{*/
1629 {
1630    // if the file was never queued undo file-changes done in the constructor
1631    if (QueueCounter == 1 && Status == StatIdle && FileSize == 0 && Complete == false)
1632    {
1633       string const Final = _config->FindDir("Dir::State::lists") + URItoFileName(RealURI);
1634       string const LastGoodSig = DestFile + ".reverify";
1635       if (RealFileExists(Final) == false && RealFileExists(LastGoodSig) == true)
1636          Rename(LastGoodSig, Final);
1637    }
1638 }
1639                                                                         /*}}}*/
1640 // pkgAcqMetaClearSig::Custom600Headers - Insert custom request headers /*{{{*/
1641 // ---------------------------------------------------------------------
1642 // FIXME: this can go away once the InRelease file is used widely
1643 string pkgAcqMetaClearSig::Custom600Headers()
1644 {
1645    string Final = _config->FindDir("Dir::State::lists");
1646    Final += URItoFileName(RealURI);
1647
1648    struct stat Buf;
1649    if (stat(Final.c_str(),&Buf) != 0)
1650    {
1651       Final = DestFile + ".reverify";
1652       if (stat(Final.c_str(),&Buf) != 0)
1653          return "\nIndex-File: true\nFail-Ignore: true\n";
1654    }
1655
1656    return "\nIndex-File: true\nFail-Ignore: true\nLast-Modified: " + TimeRFC1123(Buf.st_mtime);
1657 }
1658                                                                         /*}}}*/
1659 void pkgAcqMetaClearSig::Failed(string Message,pkgAcquire::MethodConfig *Cnf) /*{{{*/
1660 {
1661    if (AuthPass == false)
1662    {
1663       // Remove the 'old' InRelease file if we try Release.gpg now as otherwise
1664       // the file will stay around and gives a false-auth impression (CVE-2012-0214)
1665       string FinalFile = _config->FindDir("Dir::State::lists");
1666       FinalFile.append(URItoFileName(RealURI));
1667       if (FileExists(FinalFile))
1668          unlink(FinalFile.c_str());
1669
1670       new pkgAcqMetaSig(Owner,
1671                         MetaSigURI, MetaSigURIDesc, MetaSigShortDesc,
1672                         MetaIndexURI, MetaIndexURIDesc, MetaIndexShortDesc,
1673                         IndexTargets, MetaIndexParser);
1674       if (Cnf->LocalOnly == true ||
1675           StringToBool(LookupTag(Message, "Transient-Failure"), false) == false)
1676          Dequeue();
1677    }
1678    else
1679       pkgAcqMetaIndex::Failed(Message, Cnf);
1680 }
1681                                                                         /*}}}*/
1682 // AcqArchive::AcqArchive - Constructor                                 /*{{{*/
1683 // ---------------------------------------------------------------------
1684 /* This just sets up the initial fetch environment and queues the first
1685    possibilitiy */
1686 pkgAcqArchive::pkgAcqArchive(pkgAcquire *Owner,pkgSourceList *Sources,
1687                              pkgRecords *Recs,pkgCache::VerIterator const &Version,
1688                              string &StoreFilename) :
1689                Item(Owner), Version(Version), Sources(Sources), Recs(Recs),
1690                StoreFilename(StoreFilename), Vf(Version.FileList()),
1691                Trusted(false)
1692 {
1693    Retries = _config->FindI("Acquire::Retries",0);
1694
1695    if (Version.Arch() == 0)
1696    {
1697       _error->Error(_("I wasn't able to locate a file for the %s package. "
1698                       "This might mean you need to manually fix this package. "
1699                       "(due to missing arch)"),
1700                     Version.ParentPkg().Name());
1701       return;
1702    }
1703
1704    /* We need to find a filename to determine the extension. We make the
1705       assumption here that all the available sources for this version share
1706       the same extension.. */
1707    // Skip not source sources, they do not have file fields.
1708    for (; Vf.end() == false; ++Vf)
1709    {
1710       if ((Vf.File()->Flags & pkgCache::Flag::NotSource) != 0)
1711          continue;
1712       break;
1713    }
1714
1715    // Does not really matter here.. we are going to fail out below
1716    if (Vf.end() != true)
1717    {
1718       // If this fails to get a file name we will bomb out below.
1719       pkgRecords::Parser &Parse = Recs->Lookup(Vf);
1720       if (_error->PendingError() == true)
1721          return;
1722
1723       // Generate the final file name as: package_version_arch.foo
1724       StoreFilename = QuoteString(Version.ParentPkg().Name(),"_:") + '_' +
1725                       QuoteString(Version.VerStr(),"_:") + '_' +
1726                       QuoteString(Version.Arch(),"_:.") +
1727                       "." + flExtension(Parse.FileName());
1728    }
1729
1730    // check if we have one trusted source for the package. if so, switch
1731    // to "TrustedOnly" mode
1732    for (pkgCache::VerFileIterator i = Version.FileList(); i.end() == false; ++i)
1733    {
1734       pkgIndexFile *Index;
1735       if (Sources->FindIndex(i.File(),Index) == false)
1736          continue;
1737       if (_config->FindB("Debug::pkgAcquire::Auth", false))
1738       {
1739          std::cerr << "Checking index: " << Index->Describe()
1740                    << "(Trusted=" << Index->IsTrusted() << ")\n";
1741       }
1742       if (Index->IsTrusted()) {
1743          Trusted = true;
1744          break;
1745       }
1746    }
1747
1748    // "allow-unauthenticated" restores apts old fetching behaviour
1749    // that means that e.g. unauthenticated file:// uris are higher
1750    // priority than authenticated http:// uris
1751    if (_config->FindB("APT::Get::AllowUnauthenticated",false) == true)
1752       Trusted = false;
1753
1754    // Select a source
1755    if (QueueNext() == false && _error->PendingError() == false)
1756       _error->Error(_("I wasn't able to locate a file for the %s package. "
1757                     "This might mean you need to manually fix this package."),
1758                     Version.ParentPkg().Name());
1759 }
1760                                                                         /*}}}*/
1761 // AcqArchive::QueueNext - Queue the next file source                   /*{{{*/
1762 // ---------------------------------------------------------------------
1763 /* This queues the next available file version for download. It checks if
1764    the archive is already available in the cache and stashs the MD5 for
1765    checking later. */
1766 bool pkgAcqArchive::QueueNext()
1767 {
1768    string const ForceHash = _config->Find("Acquire::ForceHash");
1769    for (; Vf.end() == false; ++Vf)
1770    {
1771       // Ignore not source sources
1772       if ((Vf.File()->Flags & pkgCache::Flag::NotSource) != 0)
1773          continue;
1774
1775       // Try to cross match against the source list
1776       pkgIndexFile *Index;
1777       if (Sources->FindIndex(Vf.File(),Index) == false)
1778             continue;
1779
1780       // only try to get a trusted package from another source if that source
1781       // is also trusted
1782       if(Trusted && !Index->IsTrusted())
1783          continue;
1784
1785       // Grab the text package record
1786       pkgRecords::Parser &Parse = Recs->Lookup(Vf);
1787       if (_error->PendingError() == true)
1788          return false;
1789
1790       string PkgFile = Parse.FileName();
1791       if (ForceHash.empty() == false)
1792       {
1793          if(stringcasecmp(ForceHash, "sha512") == 0)
1794             ExpectedHash = HashString("SHA512", Parse.SHA512Hash());
1795          else if(stringcasecmp(ForceHash, "sha256") == 0)
1796             ExpectedHash = HashString("SHA256", Parse.SHA256Hash());
1797          else if (stringcasecmp(ForceHash, "sha1") == 0)
1798             ExpectedHash = HashString("SHA1", Parse.SHA1Hash());
1799          else
1800             ExpectedHash = HashString("MD5Sum", Parse.MD5Hash());
1801       }
1802       else
1803       {
1804          string Hash;
1805          if ((Hash = Parse.SHA512Hash()).empty() == false)
1806             ExpectedHash = HashString("SHA512", Hash);
1807          else if ((Hash = Parse.SHA256Hash()).empty() == false)
1808             ExpectedHash = HashString("SHA256", Hash);
1809          else if ((Hash = Parse.SHA1Hash()).empty() == false)
1810             ExpectedHash = HashString("SHA1", Hash);
1811          else
1812             ExpectedHash = HashString("MD5Sum", Parse.MD5Hash());
1813       }
1814       if (PkgFile.empty() == true)
1815          return _error->Error(_("The package index files are corrupted. No Filename: "
1816                               "field for package %s."),
1817                               Version.ParentPkg().Name());
1818
1819       Desc.URI = Index->ArchiveURI(PkgFile);
1820       Desc.Description = Index->ArchiveInfo(Version);
1821       Desc.Owner = this;
1822       Desc.ShortDesc = Version.ParentPkg().Name();
1823
1824       // See if we already have the file. (Legacy filenames)
1825       FileSize = Version->Size;
1826       string FinalFile = _config->FindDir("Dir::Cache::Archives") + flNotDir(PkgFile);
1827       struct stat Buf;
1828       if (stat(FinalFile.c_str(),&Buf) == 0)
1829       {
1830          // Make sure the size matches
1831          if ((unsigned long long)Buf.st_size == Version->Size)
1832          {
1833             Complete = true;
1834             Local = true;
1835             Status = StatDone;
1836             StoreFilename = DestFile = FinalFile;
1837             return true;
1838          }
1839
1840          /* Hmm, we have a file and its size does not match, this means it is
1841             an old style mismatched arch */
1842          unlink(FinalFile.c_str());
1843       }
1844
1845       // Check it again using the new style output filenames
1846       FinalFile = _config->FindDir("Dir::Cache::Archives") + flNotDir(StoreFilename);
1847       if (stat(FinalFile.c_str(),&Buf) == 0)
1848       {
1849          // Make sure the size matches
1850          if ((unsigned long long)Buf.st_size == Version->Size)
1851          {
1852             Complete = true;
1853             Local = true;
1854             Status = StatDone;
1855             StoreFilename = DestFile = FinalFile;
1856             return true;
1857          }
1858
1859          /* Hmm, we have a file and its size does not match, this shouldnt
1860             happen.. */
1861          unlink(FinalFile.c_str());
1862       }
1863
1864       DestFile = _config->FindDir("Dir::Cache::Archives") + "partial/" + flNotDir(StoreFilename);
1865
1866       // Check the destination file
1867       if (stat(DestFile.c_str(),&Buf) == 0)
1868       {
1869          // Hmm, the partial file is too big, erase it
1870          if ((unsigned long long)Buf.st_size > Version->Size)
1871             unlink(DestFile.c_str());
1872          else
1873             PartialSize = Buf.st_size;
1874       }
1875
1876       // Disables download of archives - useful if no real installation follows,
1877       // e.g. if we are just interested in proposed installation order
1878       if (_config->FindB("Debug::pkgAcqArchive::NoQueue", false) == true)
1879       {
1880          Complete = true;
1881          Local = true;
1882          Status = StatDone;
1883          StoreFilename = DestFile = FinalFile;
1884          return true;
1885       }
1886
1887       // Create the item
1888       Local = false;
1889       Desc.URI = Index->ArchiveURI(PkgFile);
1890       Desc.Description = Index->ArchiveInfo(Version);
1891       Desc.Owner = this;
1892       Desc.ShortDesc = Version.ParentPkg().Name();
1893       QueueURI(Desc);
1894
1895       ++Vf;
1896       return true;
1897    }
1898    return false;
1899 }
1900                                                                         /*}}}*/
1901 // AcqArchive::Done - Finished fetching                                 /*{{{*/
1902 // ---------------------------------------------------------------------
1903 /* */
1904 void pkgAcqArchive::Done(string Message,unsigned long long Size,string CalcHash,
1905                          pkgAcquire::MethodConfig *Cfg)
1906 {
1907    Item::Done(Message,Size,CalcHash,Cfg);
1908
1909    // Check the size
1910    if (Size != Version->Size)
1911    {
1912       Status = StatError;
1913       ErrorText = _("Size mismatch");
1914       return;
1915    }
1916
1917    // Check the hash
1918    if(ExpectedHash.toStr() != CalcHash)
1919    {
1920       Status = StatError;
1921       ErrorText = _("Hash Sum mismatch");
1922       if(FileExists(DestFile))
1923          Rename(DestFile,DestFile + ".FAILED");
1924       return;
1925    }
1926
1927    // Grab the output filename
1928    string FileName = LookupTag(Message,"Filename");
1929    if (FileName.empty() == true)
1930    {
1931       Status = StatError;
1932       ErrorText = "Method gave a blank filename";
1933       return;
1934    }
1935
1936    Complete = true;
1937
1938    // Reference filename
1939    if (FileName != DestFile)
1940    {
1941       StoreFilename = DestFile = FileName;
1942       Local = true;
1943       return;
1944    }
1945
1946    // Done, move it into position
1947    string FinalFile = _config->FindDir("Dir::Cache::Archives");
1948    FinalFile += flNotDir(StoreFilename);
1949    Rename(DestFile,FinalFile);
1950
1951    StoreFilename = DestFile = FinalFile;
1952    Complete = true;
1953 }
1954                                                                         /*}}}*/
1955 // AcqArchive::Failed - Failure handler                                 /*{{{*/
1956 // ---------------------------------------------------------------------
1957 /* Here we try other sources */
1958 void pkgAcqArchive::Failed(string Message,pkgAcquire::MethodConfig *Cnf)
1959 {
1960    ErrorText = LookupTag(Message,"Message");
1961
1962    /* We don't really want to retry on failed media swaps, this prevents
1963       that. An interesting observation is that permanent failures are not
1964       recorded. */
1965    if (Cnf->Removable == true &&
1966        StringToBool(LookupTag(Message,"Transient-Failure"),false) == true)
1967    {
1968       // Vf = Version.FileList();
1969       while (Vf.end() == false) ++Vf;
1970       StoreFilename = string();
1971       Item::Failed(Message,Cnf);
1972       return;
1973    }
1974
1975    if (QueueNext() == false)
1976    {
1977       // This is the retry counter
1978       if (Retries != 0 &&
1979           Cnf->LocalOnly == false &&
1980           StringToBool(LookupTag(Message,"Transient-Failure"),false) == true)
1981       {
1982          Retries--;
1983          Vf = Version.FileList();
1984          if (QueueNext() == true)
1985             return;
1986       }
1987
1988       StoreFilename = string();
1989       Item::Failed(Message,Cnf);
1990    }
1991 }
1992                                                                         /*}}}*/
1993 // AcqArchive::IsTrusted - Determine whether this archive comes from a trusted source /*{{{*/
1994 // ---------------------------------------------------------------------
1995 bool pkgAcqArchive::IsTrusted()
1996 {
1997    return Trusted;
1998 }
1999                                                                         /*}}}*/
2000 // AcqArchive::Finished - Fetching has finished, tidy up                /*{{{*/
2001 // ---------------------------------------------------------------------
2002 /* */
2003 void pkgAcqArchive::Finished()
2004 {
2005    if (Status == pkgAcquire::Item::StatDone &&
2006        Complete == true)
2007       return;
2008    StoreFilename = string();
2009 }
2010                                                                         /*}}}*/
2011 // AcqFile::pkgAcqFile - Constructor                                    /*{{{*/
2012 // ---------------------------------------------------------------------
2013 /* The file is added to the queue */
2014 pkgAcqFile::pkgAcqFile(pkgAcquire *Owner,string URI,string Hash,
2015                        unsigned long long Size,string Dsc,string ShortDesc,
2016                        const string &DestDir, const string &DestFilename,
2017                        bool IsIndexFile) :
2018                        Item(Owner), ExpectedHash(Hash), IsIndexFile(IsIndexFile)
2019 {
2020    Retries = _config->FindI("Acquire::Retries",0);
2021
2022    if(!DestFilename.empty())
2023       DestFile = DestFilename;
2024    else if(!DestDir.empty())
2025       DestFile = DestDir + "/" + flNotDir(URI);
2026    else
2027       DestFile = flNotDir(URI);
2028
2029    // Create the item
2030    Desc.URI = URI;
2031    Desc.Description = Dsc;
2032    Desc.Owner = this;
2033
2034    // Set the short description to the archive component
2035    Desc.ShortDesc = ShortDesc;
2036
2037    // Get the transfer sizes
2038    FileSize = Size;
2039    struct stat Buf;
2040    if (stat(DestFile.c_str(),&Buf) == 0)
2041    {
2042       // Hmm, the partial file is too big, erase it
2043       if ((unsigned long long)Buf.st_size > Size)
2044          unlink(DestFile.c_str());
2045       else
2046          PartialSize = Buf.st_size;
2047    }
2048
2049    QueueURI(Desc);
2050 }
2051                                                                         /*}}}*/
2052 // AcqFile::Done - Item downloaded OK                                   /*{{{*/
2053 // ---------------------------------------------------------------------
2054 /* */
2055 void pkgAcqFile::Done(string Message,unsigned long long Size,string CalcHash,
2056                       pkgAcquire::MethodConfig *Cnf)
2057 {
2058    Item::Done(Message,Size,CalcHash,Cnf);
2059
2060    // Check the hash
2061    if(!ExpectedHash.empty() && ExpectedHash.toStr() != CalcHash)
2062    {
2063       Status = StatError;
2064       ErrorText = _("Hash Sum mismatch");
2065       Rename(DestFile,DestFile + ".FAILED");
2066       return;
2067    }
2068
2069    string FileName = LookupTag(Message,"Filename");
2070    if (FileName.empty() == true)
2071    {
2072       Status = StatError;
2073       ErrorText = "Method gave a blank filename";
2074       return;
2075    }
2076
2077    Complete = true;
2078
2079    // The files timestamp matches
2080    if (StringToBool(LookupTag(Message,"IMS-Hit"),false) == true)
2081       return;
2082
2083    // We have to copy it into place
2084    if (FileName != DestFile)
2085    {
2086       Local = true;
2087       if (_config->FindB("Acquire::Source-Symlinks",true) == false ||
2088           Cnf->Removable == true)
2089       {
2090          Desc.URI = "copy:" + FileName;
2091          QueueURI(Desc);
2092          return;
2093       }
2094
2095       // Erase the file if it is a symlink so we can overwrite it
2096       struct stat St;
2097       if (lstat(DestFile.c_str(),&St) == 0)
2098       {
2099          if (S_ISLNK(St.st_mode) != 0)
2100             unlink(DestFile.c_str());
2101       }
2102
2103       // Symlink the file
2104       if (symlink(FileName.c_str(),DestFile.c_str()) != 0)
2105       {
2106          ErrorText = "Link to " + DestFile + " failure ";
2107          Status = StatError;
2108          Complete = false;
2109       }
2110    }
2111 }
2112                                                                         /*}}}*/
2113 // AcqFile::Failed - Failure handler                                    /*{{{*/
2114 // ---------------------------------------------------------------------
2115 /* Here we try other sources */
2116 void pkgAcqFile::Failed(string Message,pkgAcquire::MethodConfig *Cnf)
2117 {
2118    ErrorText = LookupTag(Message,"Message");
2119
2120    // This is the retry counter
2121    if (Retries != 0 &&
2122        Cnf->LocalOnly == false &&
2123        StringToBool(LookupTag(Message,"Transient-Failure"),false) == true)
2124    {
2125       Retries--;
2126       QueueURI(Desc);
2127       return;
2128    }
2129
2130    Item::Failed(Message,Cnf);
2131 }
2132                                                                         /*}}}*/
2133 // AcqIndex::Custom600Headers - Insert custom request headers           /*{{{*/
2134 // ---------------------------------------------------------------------
2135 /* The only header we use is the last-modified header. */
2136 string pkgAcqFile::Custom600Headers()
2137 {
2138    if (IsIndexFile)
2139       return "\nIndex-File: true";
2140    return "";
2141 }
2142                                                                         /*}}}*/