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