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 <apt-pkg/acquire-item.h>
  17 #include <apt-pkg/configuration.h>
  18 #include <apt-pkg/aptconfiguration.h>
  19 #include <apt-pkg/sourcelist.h>
  20 #include <apt-pkg/error.h>
  21 #include <apt-pkg/strutl.h>
  22 #include <apt-pkg/fileutl.h>
  23 #include <apt-pkg/md5.h>
  24 #include <apt-pkg/sha1.h>
  25 #include <apt-pkg/tagfile.h>
  26
  27 #include <apti18n.h>
  28
  29 #include <sys/stat.h>
  30 #include <unistd.h>
  31 #include <errno.h>
  32 #include <string>
  33 #include <sstream>
  34 #include <stdio.h>
  35 #include <ctime>
  36                                                                         /*}}}*/
  37
  38 using namespace std;
  39
  40 // Acquire::Item::Item - Constructor                                    /*{{{*/
  41 // ---------------------------------------------------------------------
  42 /* */
  43 pkgAcquire::Item::Item(pkgAcquire *Owner) : Owner(Owner), FileSize(0),
  44                        PartialSize(0), Mode(0), ID(0), Complete(false),
  45                        Local(false), QueueCounter(0)
  46 {
  47    Owner->Add(this);
  48    Status = StatIdle;
  49 }
  50                                                                         /*}}}*/
  51 // Acquire::Item::~Item - Destructor                                    /*{{{*/
  52 // ---------------------------------------------------------------------
  53 /* */
  54 pkgAcquire::Item::~Item()
  55 {
  56    Owner->Remove(this);
  57 }
  58                                                                         /*}}}*/
  59 // Acquire::Item::Failed - Item failed to download                      /*{{{*/
  60 // ---------------------------------------------------------------------
  61 /* We return to an idle state if there are still other queues that could
  62    fetch this object */
  63 void pkgAcquire::Item::Failed(string Message,pkgAcquire::MethodConfig *Cnf)
  64 {
  65    Status = StatIdle;
  66    ErrorText = LookupTag(Message,"Message");
  67    UsedMirror =  LookupTag(Message,"UsedMirror");
  68    if (QueueCounter <= 1)
  69    {
  70       /* This indicates that the file is not available right now but might
  71          be sometime later. If we do a retry cycle then this should be
  72          retried [CDROMs] */
  73       if (Cnf->LocalOnly == true &&
  74           StringToBool(LookupTag(Message,"Transient-Failure"),false) == true)
  75       {
  76          Status = StatIdle;
  77          Dequeue();
  78          return;
  79       }
  80
  81       Status = StatError;
  82       Dequeue();
  83    }
  84
  85    // report mirror failure back to LP if we actually use a mirror
  86    string FailReason = LookupTag(Message, "FailReason");
  87    if(FailReason.size() != 0)
  88       ReportMirrorFailure(FailReason);
  89    else
  90       ReportMirrorFailure(ErrorText);
  91 }
  92                                                                         /*}}}*/
  93 // Acquire::Item::Start - Item has begun to download                    /*{{{*/
  94 // ---------------------------------------------------------------------
  95 /* Stash status and the file size. Note that setting Complete means
  96    sub-phases of the acquire process such as decompresion are operating */
  97 void pkgAcquire::Item::Start(string /*Message*/,unsigned long Size)
  98 {
  99    Status = StatFetching;
 100    if (FileSize == 0 && Complete == false)
 101       FileSize = Size;
 102 }
 103                                                                         /*}}}*/
 104 // Acquire::Item::Done - Item downloaded OK                             /*{{{*/
 105 // ---------------------------------------------------------------------
 106 /* */
 107 void pkgAcquire::Item::Done(string Message,unsigned long Size,string Hash,
 108                             pkgAcquire::MethodConfig *Cnf)
 109 {
 110    // We just downloaded something..
 111    string FileName = LookupTag(Message,"Filename");
 112    UsedMirror =  LookupTag(Message,"UsedMirror");
 113    if (Complete == false && !Local && FileName == DestFile)
 114    {
 115       if (Owner->Log != 0)
 116          Owner->Log->Fetched(Size,atoi(LookupTag(Message,"Resume-Point","0").c_str()));
 117    }
 118
 119    if (FileSize == 0)
 120       FileSize= Size;
 121    Status = StatDone;
 122    ErrorText = string();
 123    Owner->Dequeue(this);
 124 }
 125                                                                         /*}}}*/
 126 // Acquire::Item::Rename - Rename a file                                /*{{{*/
 127 // ---------------------------------------------------------------------
 128 /* This helper function is used by alot of item methods as thier final
 129    step */
 130 void pkgAcquire::Item::Rename(string From,string To)
 131 {
 132    if (rename(From.c_str(),To.c_str()) != 0)
 133    {
 134       char S[300];
 135       snprintf(S,sizeof(S),_("rename failed, %s (%s -> %s)."),strerror(errno),
 136               From.c_str(),To.c_str());
 137       Status = StatError;
 138       ErrorText = S;
 139    }
 140 }
 141                                                                         /*}}}*/
 142 // Acquire::Item::ReportMirrorFailure                                   /*{{{*/
 143 // ---------------------------------------------------------------------
 144 void pkgAcquire::Item::ReportMirrorFailure(string FailCode)
 145 {
 146    // we only act if a mirror was used at all
 147    if(UsedMirror.empty())
 148       return;
 149 #if 0
 150    std::cerr << "\nReportMirrorFailure: "
 151              << UsedMirror
 152              << " Uri: " << DescURI()
 153              << " FailCode: "
 154              << FailCode << std::endl;
 155 #endif
 156    const char *Args[40];
 157    unsigned int i = 0;
 158    string report = _config->Find("Methods::Mirror::ProblemReporting",
 159                                  "/usr/lib/apt/apt-report-mirror-failure");
 160    if(!FileExists(report))
 161       return;
 162    Args[i++] = report.c_str();
 163    Args[i++] = UsedMirror.c_str();
 164    Args[i++] = DescURI().c_str();
 165    Args[i++] = FailCode.c_str();
 166    Args[i++] = NULL;
 167    pid_t pid = ExecFork();
 168    if(pid < 0)
 169    {
 170       _error->Error("ReportMirrorFailure Fork failed");
 171       return;
 172    }
 173    else if(pid == 0)
 174    {
 175       execvp(Args[0], (char**)Args);
 176       std::cerr << "Could not exec " << Args[0] << std::endl;
 177       _exit(100);
 178    }
 179    if(!ExecWait(pid, "report-mirror-failure"))
 180    {
 181       _error->Warning("Couldn't report problem to '%s'",
 182                       _config->Find("Methods::Mirror::ProblemReporting").c_str());
 183    }
 184 }
 185                                                                         /*}}}*/
 186 // AcqSubIndex::AcqSubIndex - Constructor                               /*{{{*/
 187 // ---------------------------------------------------------------------
 188 /* Get the Index file first and see if there are languages available
 189  * If so, create a pkgAcqIndexTrans for the found language(s).
 190  */
 191 pkgAcqSubIndex::pkgAcqSubIndex(pkgAcquire *Owner, string const &URI,
 192                                  string const &URIDesc, string const &ShortDesc,
 193                                  HashString const &ExpectedHash)
 194    : Item(Owner), ExpectedHash(ExpectedHash)
 195 {
 196    Debug = _config->FindB("Debug::pkgAcquire::SubIndex",false);
 197
 198    DestFile = _config->FindDir("Dir::State::lists") + "partial/";
 199    DestFile += URItoFileName(URI);
 200
 201    Desc.URI = URI;
 202    Desc.Description = URIDesc;
 203    Desc.Owner = this;
 204    Desc.ShortDesc = ShortDesc;
 205
 206    QueueURI(Desc);
 207
 208    if(Debug)
 209       std::clog << "pkgAcqSubIndex: " << Desc.URI << std::endl;
 210 }
 211                                                                         /*}}}*/
 212 // AcqSubIndex::Custom600Headers - Insert custom request headers        /*{{{*/
 213 // ---------------------------------------------------------------------
 214 /* The only header we use is the last-modified header. */
 215 string pkgAcqSubIndex::Custom600Headers()
 216 {
 217    string Final = _config->FindDir("Dir::State::lists");
 218    Final += URItoFileName(Desc.URI);
 219
 220    struct stat Buf;
 221    if (stat(Final.c_str(),&Buf) != 0)
 222       return "\nIndex-File: true\nFail-Ignore: true\n";
 223    return "\nIndex-File: true\nFail-Ignore: true\nLast-Modified: " + TimeRFC1123(Buf.st_mtime);
 224 }
 225                                                                         /*}}}*/
 226 void pkgAcqSubIndex::Failed(string Message,pkgAcquire::MethodConfig *Cnf)       /*{{{*/
 227 {
 228    if(Debug)
 229       std::clog << "pkgAcqSubIndex failed: " << Desc.URI << std::endl;
 230
 231    Complete = false;
 232    Status = StatDone;
 233    Dequeue();
 234
 235    // No good Index is provided, so try guessing
 236    std::vector<std::string> langs = APT::Configuration::getLanguages(true);
 237    for (std::vector<std::string>::const_iterator l = langs.begin();
 238         l != langs.end(); ++l)
 239    {
 240       if (*l == "none") continue;
 241       string const file = "Translation-" + *l;
 242       new pkgAcqIndexTrans(Owner, Desc.URI.substr(0, Desc.URI.rfind('/')+1).append(file),
 243                 Desc.Description.erase(Desc.Description.rfind(' ')+1).append(file),
 244                 file);
 245    }
 246 }
 247                                                                         /*}}}*/
 248 void pkgAcqSubIndex::Done(string Message,unsigned long Size,string Md5Hash,     /*{{{*/
 249                            pkgAcquire::MethodConfig *Cnf)
 250 {
 251    if(Debug)
 252       std::clog << "pkgAcqSubIndex::Done(): " << Desc.URI << std::endl;
 253
 254    string FileName = LookupTag(Message,"Filename");
 255    if (FileName.empty() == true)
 256    {
 257       Status = StatError;
 258       ErrorText = "Method gave a blank filename";
 259       return;
 260    }
 261
 262    if (FileName != DestFile)
 263    {
 264       Local = true;
 265       Desc.URI = "copy:" + FileName;
 266       QueueURI(Desc);
 267       return;
 268    }
 269
 270    Item::Done(Message,Size,Md5Hash,Cnf);
 271
 272    string FinalFile = _config->FindDir("Dir::State::lists")+URItoFileName(Desc.URI);
 273
 274    /* Downloaded invalid transindex => Error (LP: #346386) (Closes: #627642) */
 275    indexRecords SubIndexParser;
 276    if (FileExists(DestFile) == true && !SubIndexParser.Load(DestFile)) {
 277       Status = StatError;
 278       ErrorText = SubIndexParser.ErrorText;
 279       return;
 280    }
 281
 282    // sucess in downloading the index
 283    // rename the index
 284    if(Debug)
 285       std::clog << "Renaming: " << DestFile << " -> " << FinalFile << std::endl;
 286    Rename(DestFile,FinalFile);
 287    chmod(FinalFile.c_str(),0644);
 288    DestFile = FinalFile;
 289
 290    if(ParseIndex(DestFile) == false)
 291       return Failed("", NULL);
 292
 293    Complete = true;
 294    Status = StatDone;
 295    Dequeue();
 296    return;
 297 }
 298                                                                         /*}}}*/
 299 bool pkgAcqSubIndex::ParseIndex(string const &IndexFile)                /*{{{*/
 300 {
 301    indexRecords SubIndexParser;
 302    if (FileExists(IndexFile) == false || SubIndexParser.Load(IndexFile) == false)
 303       return false;
 304
 305    std::vector<std::string> lang = APT::Configuration::getLanguages(true);
 306    for (std::vector<std::string>::const_iterator l = lang.begin();
 307         l != lang.end(); ++l)
 308    {
 309       if (*l == "none")
 310          continue;
 311
 312       string file = "Translation-" + *l;
 313       indexRecords::checkSum const *Record = SubIndexParser.Lookup(file);
 314       HashString expected;
 315       if (Record == NULL)
 316       {
 317          // FIXME: the Index file provided by debian currently only includes bz2 records
 318          Record = SubIndexParser.Lookup(file + ".bz2");
 319          if (Record == NULL)
 320             continue;
 321       }
 322       else
 323       {
 324          expected = Record->Hash;
 325          if (expected.empty() == true)
 326             continue;
 327       }
 328
 329       IndexTarget target;
 330       target.Description = Desc.Description.erase(Desc.Description.rfind(' ')+1).append(file);
 331       target.MetaKey = file;
 332       target.ShortDesc = file;
 333       target.URI = Desc.URI.substr(0, Desc.URI.rfind('/')+1).append(file);
 334       new pkgAcqIndexTrans(Owner, &target, expected, &SubIndexParser);
 335    }
 336    return true;
 337 }
 338                                                                         /*}}}*/
 339 // AcqDiffIndex::AcqDiffIndex - Constructor                             /*{{{*/
 340 // ---------------------------------------------------------------------
 341 /* Get the DiffIndex file first and see if there are patches availabe
 342  * If so, create a pkgAcqIndexDiffs fetcher that will get and apply the
 343  * patches. If anything goes wrong in that process, it will fall back to
 344  * the original packages file
 345  */
 346 pkgAcqDiffIndex::pkgAcqDiffIndex(pkgAcquire *Owner,
 347                                  string URI,string URIDesc,string ShortDesc,
 348                                  HashString ExpectedHash)
 349    : Item(Owner), RealURI(URI), ExpectedHash(ExpectedHash),
 350      Description(URIDesc)
 351 {
 352
 353    Debug = _config->FindB("Debug::pkgAcquire::Diffs",false);
 354
 355    Desc.Description = URIDesc + "/DiffIndex";
 356    Desc.Owner = this;
 357    Desc.ShortDesc = ShortDesc;
 358    Desc.URI = URI + ".diff/Index";
 359
 360    DestFile = _config->FindDir("Dir::State::lists") + "partial/";
 361    DestFile += URItoFileName(URI) + string(".DiffIndex");
 362
 363    if(Debug)
 364       std::clog << "pkgAcqDiffIndex: " << Desc.URI << std::endl;
 365
 366    // look for the current package file
 367    CurrentPackagesFile = _config->FindDir("Dir::State::lists");
 368    CurrentPackagesFile += URItoFileName(RealURI);
 369
 370    // FIXME: this file:/ check is a hack to prevent fetching
 371    //        from local sources. this is really silly, and
 372    //        should be fixed cleanly as soon as possible
 373    if(!FileExists(CurrentPackagesFile) ||
 374       Desc.URI.substr(0,strlen("file:/")) == "file:/")
 375    {
 376       // we don't have a pkg file or we don't want to queue
 377       if(Debug)
 378          std::clog << "No index file, local or canceld by user" << std::endl;
 379       Failed("", NULL);
 380       return;
 381    }
 382
 383    if(Debug)
 384       std::clog << "pkgAcqIndexDiffs::pkgAcqIndexDiffs(): "
 385                 << CurrentPackagesFile << std::endl;
 386
 387    QueueURI(Desc);
 388
 389 }
 390                                                                         /*}}}*/
 391 // AcqIndex::Custom600Headers - Insert custom request headers           /*{{{*/
 392 // ---------------------------------------------------------------------
 393 /* The only header we use is the last-modified header. */
 394 string pkgAcqDiffIndex::Custom600Headers()
 395 {
 396    string Final = _config->FindDir("Dir::State::lists");
 397    Final += URItoFileName(RealURI) + string(".IndexDiff");
 398
 399    if(Debug)
 400       std::clog << "Custom600Header-IMS: " << Final << std::endl;
 401
 402    struct stat Buf;
 403    if (stat(Final.c_str(),&Buf) != 0)
 404       return "\nIndex-File: true";
 405
 406    return "\nIndex-File: true\nLast-Modified: " + TimeRFC1123(Buf.st_mtime);
 407 }
 408                                                                         /*}}}*/
 409 bool pkgAcqDiffIndex::ParseDiffIndex(string IndexDiffFile)              /*{{{*/
 410 {
 411    if(Debug)
 412       std::clog << "pkgAcqIndexDiffs::ParseIndexDiff() " << IndexDiffFile
 413                 << std::endl;
 414
 415    pkgTagSection Tags;
 416    string ServerSha1;
 417    vector<DiffInfo> available_patches;
 418
 419    FileFd Fd(IndexDiffFile,FileFd::ReadOnly);
 420    pkgTagFile TF(&Fd);
 421    if (_error->PendingError() == true)
 422       return false;
 423
 424    if(TF.Step(Tags) == true)
 425    {
 426       bool found = false;
 427       DiffInfo d;
 428       string size;
 429
 430       string const tmp = Tags.FindS("SHA1-Current");
 431       std::stringstream ss(tmp);
 432       ss >> ServerSha1 >> size;
 433       unsigned long const ServerSize = atol(size.c_str());
 434
 435       FileFd fd(CurrentPackagesFile, FileFd::ReadOnly);
 436       SHA1Summation SHA1;
 437       SHA1.AddFD(fd.Fd(), fd.Size());
 438       string const local_sha1 = SHA1.Result();
 439
 440       if(local_sha1 == ServerSha1)
 441       {
 442          // we have the same sha1 as the server
 443          if(Debug)
 444             std::clog << "Package file is up-to-date" << std::endl;
 445          // set found to true, this will queue a pkgAcqIndexDiffs with
 446          // a empty availabe_patches
 447          found = true;
 448       }
 449       else
 450       {
 451          if(Debug)
 452             std::clog << "SHA1-Current: " << ServerSha1 << " and we start at "<< fd.Name() << " " << fd.Size() << " " << local_sha1 << std::endl;
 453
 454          // check the historie and see what patches we need
 455          string const history = Tags.FindS("SHA1-History");
 456          std::stringstream hist(history);
 457          while(hist >> d.sha1 >> size >> d.file)
 458          {
 459             // read until the first match is found
 460             // from that point on, we probably need all diffs
 461             if(d.sha1 == local_sha1)
 462                found=true;
 463             else if (found == false)
 464                continue;
 465
 466             if(Debug)
 467                std::clog << "Need to get diff: " << d.file << std::endl;
 468             available_patches.push_back(d);
 469          }
 470
 471          if (available_patches.empty() == false)
 472          {
 473             // patching with too many files is rather slow compared to a fast download
 474             unsigned long const fileLimit = _config->FindI("Acquire::PDiffs::FileLimit", 0);
 475             if (fileLimit != 0 && fileLimit < available_patches.size())
 476             {
 477                if (Debug)
 478                   std::clog << "Need " << available_patches.size() << " diffs (Limit is " << fileLimit
 479                         << ") so fallback to complete download" << std::endl;
 480                return false;
 481             }
 482
 483             // see if the patches are too big
 484             found = false; // it was true and it will be true again at the end
 485             d = *available_patches.begin();
 486             string const firstPatch = d.file;
 487             unsigned long patchesSize = 0;
 488             std::stringstream patches(Tags.FindS("SHA1-Patches"));
 489             while(patches >> d.sha1 >> size >> d.file)
 490             {
 491                if (firstPatch == d.file)
 492                   found = true;
 493                else if (found == false)
 494                   continue;
 495
 496                patchesSize += atol(size.c_str());
 497             }
 498             unsigned long const sizeLimit = ServerSize * _config->FindI("Acquire::PDiffs::SizeLimit", 100);
 499             if (sizeLimit > 0 && (sizeLimit/100) < patchesSize)
 500             {
 501                if (Debug)
 502                   std::clog << "Need " << patchesSize << " bytes (Limit is " << sizeLimit/100
 503                         << ") so fallback to complete download" << std::endl;
 504                return false;
 505             }
 506          }
 507       }
 508
 509       // we have something, queue the next diff
 510       if(found)
 511       {
 512          // queue the diffs
 513          string::size_type const last_space = Description.rfind(" ");
 514          if(last_space != string::npos)
 515             Description.erase(last_space, Description.size()-last_space);
 516          new pkgAcqIndexDiffs(Owner, RealURI, Description, Desc.ShortDesc,
 517                               ExpectedHash, ServerSha1, available_patches);
 518          Complete = false;
 519          Status = StatDone;
 520          Dequeue();
 521          return true;
 522       }
 523    }
 524
 525    // Nothing found, report and return false
 526    // Failing here is ok, if we return false later, the full
 527    // IndexFile is queued
 528    if(Debug)
 529       std::clog << "Can't find a patch in the index file" << std::endl;
 530    return false;
 531 }
 532                                                                         /*}}}*/
 533 void pkgAcqDiffIndex::Failed(string Message,pkgAcquire::MethodConfig *Cnf)      /*{{{*/
 534 {
 535    if(Debug)
 536       std::clog << "pkgAcqDiffIndex failed: " << Desc.URI << std::endl
 537                 << "Falling back to normal index file aquire" << std::endl;
 538
 539    new pkgAcqIndex(Owner, RealURI, Description, Desc.ShortDesc,
 540                    ExpectedHash);
 541
 542    Complete = false;
 543    Status = StatDone;
 544    Dequeue();
 545 }
 546                                                                         /*}}}*/
 547 void pkgAcqDiffIndex::Done(string Message,unsigned long Size,string Md5Hash,    /*{{{*/
 548                            pkgAcquire::MethodConfig *Cnf)
 549 {
 550    if(Debug)
 551       std::clog << "pkgAcqDiffIndex::Done(): " << Desc.URI << std::endl;
 552
 553    Item::Done(Message,Size,Md5Hash,Cnf);
 554
 555    string FinalFile;
 556    FinalFile = _config->FindDir("Dir::State::lists")+URItoFileName(RealURI);
 557
 558    // sucess in downloading the index
 559    // rename the index
 560    FinalFile += string(".IndexDiff");
 561    if(Debug)
 562       std::clog << "Renaming: " << DestFile << " -> " << FinalFile
 563                 << std::endl;
 564    Rename(DestFile,FinalFile);
 565    chmod(FinalFile.c_str(),0644);
 566    DestFile = FinalFile;
 567
 568    if(!ParseDiffIndex(DestFile))
 569       return Failed("", NULL);
 570
 571    Complete = true;
 572    Status = StatDone;
 573    Dequeue();
 574    return;
 575 }
 576                                                                         /*}}}*/
 577 // AcqIndexDiffs::AcqIndexDiffs - Constructor                           /*{{{*/
 578 // ---------------------------------------------------------------------
 579 /* The package diff is added to the queue. one object is constructed
 580  * for each diff and the index
 581  */
 582 pkgAcqIndexDiffs::pkgAcqIndexDiffs(pkgAcquire *Owner,
 583                                    string URI,string URIDesc,string ShortDesc,
 584                                    HashString ExpectedHash,
 585                                    string ServerSha1,
 586                                    vector<DiffInfo> diffs)
 587    : Item(Owner), RealURI(URI), ExpectedHash(ExpectedHash),
 588      available_patches(diffs), ServerSha1(ServerSha1)
 589 {
 590
 591    DestFile = _config->FindDir("Dir::State::lists") + "partial/";
 592    DestFile += URItoFileName(URI);
 593
 594    Debug = _config->FindB("Debug::pkgAcquire::Diffs",false);
 595
 596    Description = URIDesc;
 597    Desc.Owner = this;
 598    Desc.ShortDesc = ShortDesc;
 599
 600    if(available_patches.size() == 0)
 601    {
 602       // we are done (yeah!)
 603       Finish(true);
 604    }
 605    else
 606    {
 607       // get the next diff
 608       State = StateFetchDiff;
 609       QueueNextDiff();
 610    }
 611 }
 612                                                                         /*}}}*/
 613 void pkgAcqIndexDiffs::Failed(string Message,pkgAcquire::MethodConfig *Cnf)     /*{{{*/
 614 {
 615    if(Debug)
 616       std::clog << "pkgAcqIndexDiffs failed: " << Desc.URI << std::endl
 617                 << "Falling back to normal index file aquire" << std::endl;
 618    new pkgAcqIndex(Owner, RealURI, Description,Desc.ShortDesc,
 619                    ExpectedHash);
 620    Finish();
 621 }
 622                                                                         /*}}}*/
 623 // Finish - helper that cleans the item out of the fetcher queue        /*{{{*/
 624 void pkgAcqIndexDiffs::Finish(bool allDone)
 625 {
 626    // we restore the original name, this is required, otherwise
 627    // the file will be cleaned
 628    if(allDone)
 629    {
 630       DestFile = _config->FindDir("Dir::State::lists");
 631       DestFile += URItoFileName(RealURI);
 632
 633       if(!ExpectedHash.empty() && !ExpectedHash.VerifyFile(DestFile))
 634       {
 635          Status = StatAuthError;
 636          ErrorText = _("MD5Sum mismatch");
 637          Rename(DestFile,DestFile + ".FAILED");
 638          Dequeue();
 639          return;
 640       }
 641
 642       // this is for the "real" finish
 643       Complete = true;
 644       Status = StatDone;
 645       Dequeue();
 646       if(Debug)
 647          std::clog << "\n\nallDone: " << DestFile << "\n" << std::endl;
 648       return;
 649    }
 650
 651    if(Debug)
 652       std::clog << "Finishing: " << Desc.URI << std::endl;
 653    Complete = false;
 654    Status = StatDone;
 655    Dequeue();
 656    return;
 657 }
 658                                                                         /*}}}*/
 659 bool pkgAcqIndexDiffs::QueueNextDiff()                                  /*{{{*/
 660 {
 661
 662    // calc sha1 of the just patched file
 663    string FinalFile = _config->FindDir("Dir::State::lists");
 664    FinalFile += URItoFileName(RealURI);
 665
 666    FileFd fd(FinalFile, FileFd::ReadOnly);
 667    SHA1Summation SHA1;
 668    SHA1.AddFD(fd.Fd(), fd.Size());
 669    string local_sha1 = string(SHA1.Result());
 670    if(Debug)
 671       std::clog << "QueueNextDiff: "
 672                 << FinalFile << " (" << local_sha1 << ")"<<std::endl;
 673
 674    // final file reached before all patches are applied
 675    if(local_sha1 == ServerSha1)
 676    {
 677       Finish(true);
 678       return true;
 679    }
 680
 681    // remove all patches until the next matching patch is found
 682    // this requires the Index file to be ordered
 683    for(vector<DiffInfo>::iterator I=available_patches.begin();
 684        available_patches.size() > 0 &&
 685           I != available_patches.end() &&
 686           (*I).sha1 != local_sha1;
 687        I++)
 688    {
 689       available_patches.erase(I);
 690    }
 691
 692    // error checking and falling back if no patch was found
 693    if(available_patches.size() == 0)
 694    {
 695       Failed("", NULL);
 696       return false;
 697    }
 698
 699    // queue the right diff
 700    Desc.URI = string(RealURI) + ".diff/" + available_patches[0].file + ".gz";
 701    Desc.Description = Description + " " + available_patches[0].file + string(".pdiff");
 702    DestFile = _config->FindDir("Dir::State::lists") + "partial/";
 703    DestFile += URItoFileName(RealURI + ".diff/" + available_patches[0].file);
 704
 705    if(Debug)
 706       std::clog << "pkgAcqIndexDiffs::QueueNextDiff(): " << Desc.URI << std::endl;
 707
 708    QueueURI(Desc);
 709
 710    return true;
 711 }
 712                                                                         /*}}}*/
 713 void pkgAcqIndexDiffs::Done(string Message,unsigned long Size,string Md5Hash,   /*{{{*/
 714                             pkgAcquire::MethodConfig *Cnf)
 715 {
 716    if(Debug)
 717       std::clog << "pkgAcqIndexDiffs::Done(): " << Desc.URI << std::endl;
 718
 719    Item::Done(Message,Size,Md5Hash,Cnf);
 720
 721    string FinalFile;
 722    FinalFile = _config->FindDir("Dir::State::lists")+URItoFileName(RealURI);
 723
 724    // sucess in downloading a diff, enter ApplyDiff state
 725    if(State == StateFetchDiff)
 726    {
 727
 728       // rred excepts the patch as $FinalFile.ed
 729       Rename(DestFile,FinalFile+".ed");
 730
 731       if(Debug)
 732          std::clog << "Sending to rred method: " << FinalFile << std::endl;
 733
 734       State = StateApplyDiff;
 735       Local = true;
 736       Desc.URI = "rred:" + FinalFile;
 737       QueueURI(Desc);
 738       Mode = "rred";
 739       return;
 740    }
 741
 742
 743    // success in download/apply a diff, queue next (if needed)
 744    if(State == StateApplyDiff)
 745    {
 746       // remove the just applied patch
 747       available_patches.erase(available_patches.begin());
 748
 749       // move into place
 750       if(Debug)
 751       {
 752          std::clog << "Moving patched file in place: " << std::endl
 753                    << DestFile << " -> " << FinalFile << std::endl;
 754       }
 755       Rename(DestFile,FinalFile);
 756       chmod(FinalFile.c_str(),0644);
 757
 758       // see if there is more to download
 759       if(available_patches.size() > 0) {
 760          new pkgAcqIndexDiffs(Owner, RealURI, Description, Desc.ShortDesc,
 761                               ExpectedHash, ServerSha1, available_patches);
 762          return Finish();
 763       } else
 764          return Finish(true);
 765    }
 766 }
 767                                                                         /*}}}*/
 768 // AcqIndex::AcqIndex - Constructor                                     /*{{{*/
 769 // ---------------------------------------------------------------------
 770 /* The package file is added to the queue and a second class is
 771    instantiated to fetch the revision file */
 772 pkgAcqIndex::pkgAcqIndex(pkgAcquire *Owner,
 773                          string URI,string URIDesc,string ShortDesc,
 774                          HashString ExpectedHash, string comprExt)
 775    : Item(Owner), RealURI(URI), ExpectedHash(ExpectedHash)
 776 {
 777    if(comprExt.empty() == true)
 778    {
 779       // autoselect the compression method
 780       std::vector<std::string> types = APT::Configuration::getCompressionTypes();
 781       for (std::vector<std::string>::const_iterator t = types.begin(); t != types.end(); ++t)
 782          comprExt.append(*t).append(" ");
 783       if (comprExt.empty() == false)
 784          comprExt.erase(comprExt.end()-1);
 785    }
 786    CompressionExtension = comprExt;
 787
 788    Init(URI, URIDesc, ShortDesc);
 789 }
 790 pkgAcqIndex::pkgAcqIndex(pkgAcquire *Owner, IndexTarget const *Target,
 791                          HashString const &ExpectedHash, indexRecords const *MetaIndexParser)
 792    : Item(Owner), RealURI(Target->URI), ExpectedHash(ExpectedHash)
 793 {
 794    // autoselect the compression method
 795    std::vector<std::string> types = APT::Configuration::getCompressionTypes();
 796    CompressionExtension = "";
 797    if (ExpectedHash.empty() == false)
 798    {
 799       for (std::vector<std::string>::const_iterator t = types.begin(); t != types.end(); ++t)
 800          if (*t == "uncompressed" || MetaIndexParser->Exists(string(Target->MetaKey).append(".").append(*t)) == true)
 801             CompressionExtension.append(*t).append(" ");
 802    }
 803    else
 804    {
 805       for (std::vector<std::string>::const_iterator t = types.begin(); t != types.end(); ++t)
 806          CompressionExtension.append(*t).append(" ");
 807    }
 808    if (CompressionExtension.empty() == false)
 809       CompressionExtension.erase(CompressionExtension.end()-1);
 810
 811    Init(Target->URI, Target->Description, Target->ShortDesc);
 812 }
 813                                                                         /*}}}*/
 814 // AcqIndex::Init - defered Constructor                                 /*{{{*/
 815 void pkgAcqIndex::Init(string const &URI, string const &URIDesc, string const &ShortDesc) {
 816    Decompression = false;
 817    Erase = false;
 818
 819    DestFile = _config->FindDir("Dir::State::lists") + "partial/";
 820    DestFile += URItoFileName(URI);
 821
 822    std::string const comprExt = CompressionExtension.substr(0, CompressionExtension.find(' '));
 823    if (comprExt == "uncompressed")
 824       Desc.URI = URI;
 825    else
 826       Desc.URI = URI + '.' + comprExt;
 827
 828    Desc.Description = URIDesc;
 829    Desc.Owner = this;
 830    Desc.ShortDesc = ShortDesc;
 831
 832    QueueURI(Desc);
 833 }
 834                                                                         /*}}}*/
 835 // AcqIndex::Custom600Headers - Insert custom request headers           /*{{{*/
 836 // ---------------------------------------------------------------------
 837 /* The only header we use is the last-modified header. */
 838 string pkgAcqIndex::Custom600Headers()
 839 {
 840    string Final = _config->FindDir("Dir::State::lists");
 841    Final += URItoFileName(RealURI);
 842    if (_config->FindB("Acquire::GzipIndexes",false))
 843       Final += ".gz";
 844
 845    string msg = "\nIndex-File: true";
 846    // FIXME: this really should use "IndexTarget::IsOptional()" but that
 847    //        seems to be difficult without breaking ABI
 848    if (ShortDesc().find("Translation") != 0)
 849       msg += "\nFail-Ignore: true";
 850    struct stat Buf;
 851    if (stat(Final.c_str(),&Buf) == 0)
 852       msg += "\nLast-Modified: " + TimeRFC1123(Buf.st_mtime);
 853
 854    return msg;
 855 }
 856                                                                         /*}}}*/
 857 void pkgAcqIndex::Failed(string Message,pkgAcquire::MethodConfig *Cnf)  /*{{{*/
 858 {
 859    size_t const nextExt = CompressionExtension.find(' ');
 860    if (nextExt != std::string::npos)
 861    {
 862       CompressionExtension = CompressionExtension.substr(nextExt+1);
 863       Init(RealURI, Desc.Description, Desc.ShortDesc);
 864       return;
 865    }
 866
 867    // on decompression failure, remove bad versions in partial/
 868    if (Decompression && Erase) {
 869       string s = _config->FindDir("Dir::State::lists") + "partial/";
 870       s.append(URItoFileName(RealURI));
 871       unlink(s.c_str());
 872    }
 873
 874    Item::Failed(Message,Cnf);
 875 }
 876                                                                         /*}}}*/
 877 // AcqIndex::Done - Finished a fetch                                    /*{{{*/
 878 // ---------------------------------------------------------------------
 879 /* This goes through a number of states.. On the initial fetch the
 880    method could possibly return an alternate filename which points
 881    to the uncompressed version of the file. If this is so the file
 882    is copied into the partial directory. In all other cases the file
 883    is decompressed with a gzip uri. */
 884 void pkgAcqIndex::Done(string Message,unsigned long Size,string Hash,
 885                        pkgAcquire::MethodConfig *Cfg)
 886 {
 887    Item::Done(Message,Size,Hash,Cfg);
 888
 889    if (Decompression == true)
 890    {
 891       if (_config->FindB("Debug::pkgAcquire::Auth", false))
 892       {
 893          std::cerr << std::endl << RealURI << ": Computed Hash: " << Hash;
 894          std::cerr << "  Expected Hash: " << ExpectedHash.toStr() << std::endl;
 895       }
 896
 897       if (!ExpectedHash.empty() && ExpectedHash.toStr() != Hash)
 898       {
 899          Status = StatAuthError;
 900          ErrorText = _("Hash Sum mismatch");
 901          Rename(DestFile,DestFile + ".FAILED");
 902          ReportMirrorFailure("HashChecksumFailure");
 903          return;
 904       }
 905
 906       /* Verify the index file for correctness (all indexes must
 907        * have a Package field) (LP: #346386) (Closes: #627642) */
 908       {
 909          FileFd fd(DestFile, FileFd::ReadOnly);
 910          pkgTagSection sec;
 911          pkgTagFile tag(&fd);
 912
 913          // Only test for correctness if the file is not empty (empty is ok)
 914          if (fd.Size() > 0) {
 915             if (_error->PendingError() || !tag.Step(sec)) {
 916                Status = StatError;
 917                _error->DumpErrors();
 918                Rename(DestFile,DestFile + ".FAILED");
 919                return;
 920             } else if (!sec.Exists("Package")) {
 921                Status = StatError;
 922                ErrorText = ("Encountered a section with no Package: header");
 923                Rename(DestFile,DestFile + ".FAILED");
 924                return;
 925             }
 926          }
 927       }
 928
 929       // Done, move it into position
 930       string FinalFile = _config->FindDir("Dir::State::lists");
 931       FinalFile += URItoFileName(RealURI);
 932       Rename(DestFile,FinalFile);
 933       chmod(FinalFile.c_str(),0644);
 934
 935       /* We restore the original name to DestFile so that the clean operation
 936          will work OK */
 937       DestFile = _config->FindDir("Dir::State::lists") + "partial/";
 938       DestFile += URItoFileName(RealURI);
 939
 940       // Remove the compressed version.
 941       if (Erase == true)
 942          unlink(DestFile.c_str());
 943       return;
 944    }
 945
 946    Erase = false;
 947    Complete = true;
 948
 949    // Handle the unzipd case
 950    string FileName = LookupTag(Message,"Alt-Filename");
 951    if (FileName.empty() == false)
 952    {
 953       // The files timestamp matches
 954       if (StringToBool(LookupTag(Message,"Alt-IMS-Hit"),false) == true)
 955          return;
 956       Decompression = true;
 957       Local = true;
 958       DestFile += ".decomp";
 959       Desc.URI = "copy:" + FileName;
 960       QueueURI(Desc);
 961       Mode = "copy";
 962       return;
 963    }
 964
 965    FileName = LookupTag(Message,"Filename");
 966    if (FileName.empty() == true)
 967    {
 968       Status = StatError;
 969       ErrorText = "Method gave a blank filename";
 970    }
 971
 972    std::string const compExt = CompressionExtension.substr(0, CompressionExtension.find(' '));
 973
 974    // The files timestamp matches
 975    if (StringToBool(LookupTag(Message,"IMS-Hit"),false) == true) {
 976        if (_config->FindB("Acquire::GzipIndexes",false) && compExt == "gz")
 977           // Update DestFile for .gz suffix so that the clean operation keeps it
 978           DestFile += ".gz";
 979       return;
 980     }
 981
 982    if (FileName == DestFile)
 983       Erase = true;
 984    else
 985       Local = true;
 986
 987    string decompProg;
 988
 989    // If we enable compressed indexes and already have gzip, keep it
 990    if (_config->FindB("Acquire::GzipIndexes",false) && compExt == "gz" && !Local) {
 991       string FinalFile = _config->FindDir("Dir::State::lists");
 992       FinalFile += URItoFileName(RealURI) + ".gz";
 993       Rename(DestFile,FinalFile);
 994       chmod(FinalFile.c_str(),0644);
 995
 996       // Update DestFile for .gz suffix so that the clean operation keeps it
 997       DestFile = _config->FindDir("Dir::State::lists") + "partial/";
 998       DestFile += URItoFileName(RealURI) + ".gz";
 999       return;
1000     }
1001
1002    // get the binary name for your used compression type
1003    decompProg = _config->Find(string("Acquire::CompressionTypes::").append(compExt),"");
1004    if(decompProg.empty() == false);
1005    else if(compExt == "uncompressed")
1006       decompProg = "copy";
1007    else {
1008       _error->Error("Unsupported extension: %s", compExt.c_str());
1009       return;
1010    }
1011
1012    Decompression = true;
1013    DestFile += ".decomp";
1014    Desc.URI = decompProg + ":" + FileName;
1015    QueueURI(Desc);
1016    Mode = decompProg.c_str();
1017 }
1018                                                                         /*}}}*/
1019 // AcqIndexTrans::pkgAcqIndexTrans - Constructor                        /*{{{*/
1020 // ---------------------------------------------------------------------
1021 /* The Translation file is added to the queue */
1022 pkgAcqIndexTrans::pkgAcqIndexTrans(pkgAcquire *Owner,
1023                             string URI,string URIDesc,string ShortDesc)
1024   : pkgAcqIndex(Owner, URI, URIDesc, ShortDesc, HashString(), "")
1025 {
1026 }
1027 pkgAcqIndexTrans::pkgAcqIndexTrans(pkgAcquire *Owner, IndexTarget const *Target,
1028                          HashString const &ExpectedHash, indexRecords const *MetaIndexParser)
1029   : pkgAcqIndex(Owner, Target, ExpectedHash, MetaIndexParser)
1030 {
1031 }
1032                                                                         /*}}}*/
1033 // AcqIndexTrans::Custom600Headers - Insert custom request headers      /*{{{*/
1034 // ---------------------------------------------------------------------
1035 string pkgAcqIndexTrans::Custom600Headers()
1036 {
1037    string Final = _config->FindDir("Dir::State::lists");
1038    Final += URItoFileName(RealURI);
1039
1040    struct stat Buf;
1041    if (stat(Final.c_str(),&Buf) != 0)
1042       return "\nFail-Ignore: true\nIndex-File: true";
1043    return "\nFail-Ignore: true\nIndex-File: true\nLast-Modified: " + TimeRFC1123(Buf.st_mtime);
1044 }
1045                                                                         /*}}}*/
1046 // AcqIndexTrans::Failed - Silence failure messages for missing files   /*{{{*/
1047 // ---------------------------------------------------------------------
1048 /* */
1049 void pkgAcqIndexTrans::Failed(string Message,pkgAcquire::MethodConfig *Cnf)
1050 {
1051    size_t const nextExt = CompressionExtension.find(' ');
1052    if (nextExt != std::string::npos)
1053    {
1054       CompressionExtension = CompressionExtension.substr(nextExt+1);
1055       Init(RealURI, Desc.Description, Desc.ShortDesc);
1056       Status = StatIdle;
1057       return;
1058    }
1059
1060    if (Cnf->LocalOnly == true ||
1061        StringToBool(LookupTag(Message,"Transient-Failure"),false) == false)
1062    {
1063       // Ignore this
1064       Status = StatDone;
1065       Complete = false;
1066       Dequeue();
1067       return;
1068    }
1069
1070    Item::Failed(Message,Cnf);
1071 }
1072                                                                         /*}}}*/
1073 pkgAcqMetaSig::pkgAcqMetaSig(pkgAcquire *Owner,                         /*{{{*/
1074                              string URI,string URIDesc,string ShortDesc,
1075                              string MetaIndexURI, string MetaIndexURIDesc,
1076                              string MetaIndexShortDesc,
1077                              const vector<IndexTarget*>* IndexTargets,
1078                              indexRecords* MetaIndexParser) :
1079    Item(Owner), RealURI(URI), MetaIndexURI(MetaIndexURI),
1080    MetaIndexURIDesc(MetaIndexURIDesc), MetaIndexShortDesc(MetaIndexShortDesc),
1081    MetaIndexParser(MetaIndexParser), IndexTargets(IndexTargets)
1082 {
1083    DestFile = _config->FindDir("Dir::State::lists") + "partial/";
1084    DestFile += URItoFileName(URI);
1085
1086    // remove any partial downloaded sig-file in partial/.
1087    // it may confuse proxies and is too small to warrant a
1088    // partial download anyway
1089    unlink(DestFile.c_str());
1090
1091    // Create the item
1092    Desc.Description = URIDesc;
1093    Desc.Owner = this;
1094    Desc.ShortDesc = ShortDesc;
1095    Desc.URI = URI;
1096
1097    string Final = _config->FindDir("Dir::State::lists");
1098    Final += URItoFileName(RealURI);
1099    struct stat Buf;
1100    if (stat(Final.c_str(),&Buf) == 0)
1101    {
1102       // File was already in place.  It needs to be re-downloaded/verified
1103       // because Release might have changed, we do give it a differnt
1104       // name than DestFile because otherwise the http method will
1105       // send If-Range requests and there are too many broken servers
1106       // out there that do not understand them
1107       LastGoodSig = DestFile+".reverify";
1108       Rename(Final,LastGoodSig);
1109    }
1110
1111    QueueURI(Desc);
1112 }
1113                                                                         /*}}}*/
1114 // pkgAcqMetaSig::Custom600Headers - Insert custom request headers      /*{{{*/
1115 // ---------------------------------------------------------------------
1116 /* The only header we use is the last-modified header. */
1117 string pkgAcqMetaSig::Custom600Headers()
1118 {
1119    struct stat Buf;
1120    if (stat(LastGoodSig.c_str(),&Buf) != 0)
1121       return "\nIndex-File: true";
1122
1123    return "\nIndex-File: true\nLast-Modified: " + TimeRFC1123(Buf.st_mtime);
1124 }
1125
1126 void pkgAcqMetaSig::Done(string Message,unsigned long Size,string MD5,
1127                          pkgAcquire::MethodConfig *Cfg)
1128 {
1129    Item::Done(Message,Size,MD5,Cfg);
1130
1131    string FileName = LookupTag(Message,"Filename");
1132    if (FileName.empty() == true)
1133    {
1134       Status = StatError;
1135       ErrorText = "Method gave a blank filename";
1136       return;
1137    }
1138
1139    if (FileName != DestFile)
1140    {
1141       // We have to copy it into place
1142       Local = true;
1143       Desc.URI = "copy:" + FileName;
1144       QueueURI(Desc);
1145       return;
1146    }
1147
1148    Complete = true;
1149
1150    // put the last known good file back on i-m-s hit (it will
1151    // be re-verified again)
1152    // Else do nothing, we have the new file in DestFile then
1153    if(StringToBool(LookupTag(Message,"IMS-Hit"),false) == true)
1154       Rename(LastGoodSig, DestFile);
1155
1156    // queue a pkgAcqMetaIndex to be verified against the sig we just retrieved
1157    new pkgAcqMetaIndex(Owner, MetaIndexURI, MetaIndexURIDesc,
1158                        MetaIndexShortDesc,  DestFile, IndexTargets,
1159                        MetaIndexParser);
1160
1161 }
1162                                                                         /*}}}*/
1163 void pkgAcqMetaSig::Failed(string Message,pkgAcquire::MethodConfig *Cnf)/*{{{*/
1164 {
1165    string Final = _config->FindDir("Dir::State::lists") + URItoFileName(RealURI);
1166
1167    // if we get a network error we fail gracefully
1168    if(Status == StatTransientNetworkError)
1169    {
1170       Item::Failed(Message,Cnf);
1171       // move the sigfile back on transient network failures
1172       if(FileExists(LastGoodSig))
1173          Rename(LastGoodSig,Final);
1174
1175       // set the status back to , Item::Failed likes to reset it
1176       Status = pkgAcquire::Item::StatTransientNetworkError;
1177       return;
1178    }
1179
1180    // Delete any existing sigfile when the acquire failed
1181    unlink(Final.c_str());
1182
1183    // queue a pkgAcqMetaIndex with no sigfile
1184    new pkgAcqMetaIndex(Owner, MetaIndexURI, MetaIndexURIDesc, MetaIndexShortDesc,
1185                        "", IndexTargets, MetaIndexParser);
1186
1187    if (Cnf->LocalOnly == true ||
1188        StringToBool(LookupTag(Message,"Transient-Failure"),false) == false)
1189    {
1190       // Ignore this
1191       Status = StatDone;
1192       Complete = false;
1193       Dequeue();
1194       return;
1195    }
1196
1197    Item::Failed(Message,Cnf);
1198 }
1199                                                                         /*}}}*/
1200 pkgAcqMetaIndex::pkgAcqMetaIndex(pkgAcquire *Owner,                     /*{{{*/
1201                                  string URI,string URIDesc,string ShortDesc,
1202                                  string SigFile,
1203                                  const vector<struct IndexTarget*>* IndexTargets,
1204                                  indexRecords* MetaIndexParser) :
1205    Item(Owner), RealURI(URI), SigFile(SigFile), IndexTargets(IndexTargets),
1206    MetaIndexParser(MetaIndexParser), AuthPass(false), IMSHit(false)
1207 {
1208    DestFile = _config->FindDir("Dir::State::lists") + "partial/";
1209    DestFile += URItoFileName(URI);
1210
1211    // Create the item
1212    Desc.Description = URIDesc;
1213    Desc.Owner = this;
1214    Desc.ShortDesc = ShortDesc;
1215    Desc.URI = URI;
1216
1217    QueueURI(Desc);
1218 }
1219                                                                         /*}}}*/
1220 // pkgAcqMetaIndex::Custom600Headers - Insert custom request headers    /*{{{*/
1221 // ---------------------------------------------------------------------
1222 /* The only header we use is the last-modified header. */
1223 string pkgAcqMetaIndex::Custom600Headers()
1224 {
1225    string Final = _config->FindDir("Dir::State::lists");
1226    Final += URItoFileName(RealURI);
1227
1228    struct stat Buf;
1229    if (stat(Final.c_str(),&Buf) != 0)
1230       return "\nIndex-File: true";
1231
1232    return "\nIndex-File: true\nLast-Modified: " + TimeRFC1123(Buf.st_mtime);
1233 }
1234                                                                         /*}}}*/
1235 void pkgAcqMetaIndex::Done(string Message,unsigned long Size,string Hash,       /*{{{*/
1236                            pkgAcquire::MethodConfig *Cfg)
1237 {
1238    Item::Done(Message,Size,Hash,Cfg);
1239
1240    // MetaIndexes are done in two passes: one to download the
1241    // metaindex with an appropriate method, and a second to verify it
1242    // with the gpgv method
1243
1244    if (AuthPass == true)
1245    {
1246       AuthDone(Message);
1247
1248       // all cool, move Release file into place
1249       Complete = true;
1250    }
1251    else
1252    {
1253       RetrievalDone(Message);
1254       if (!Complete)
1255          // Still more retrieving to do
1256          return;
1257
1258       if (SigFile == "")
1259       {
1260          // There was no signature file, so we are finished.  Download
1261          // the indexes without verification.
1262          QueueIndexes(false);
1263       }
1264       else
1265       {
1266          // There was a signature file, so pass it to gpgv for
1267          // verification
1268
1269          if (_config->FindB("Debug::pkgAcquire::Auth", false))
1270             std::cerr << "Metaindex acquired, queueing gpg verification ("
1271                       << SigFile << "," << DestFile << ")\n";
1272          AuthPass = true;
1273          Desc.URI = "gpgv:" + SigFile;
1274          QueueURI(Desc);
1275          Mode = "gpgv";
1276          return;
1277       }
1278    }
1279
1280    if (Complete == true)
1281    {
1282       string FinalFile = _config->FindDir("Dir::State::lists");
1283       FinalFile += URItoFileName(RealURI);
1284       if (SigFile == DestFile)
1285          SigFile = FinalFile;
1286       Rename(DestFile,FinalFile);
1287       chmod(FinalFile.c_str(),0644);
1288       DestFile = FinalFile;
1289    }
1290 }
1291                                                                         /*}}}*/
1292 void pkgAcqMetaIndex::RetrievalDone(string Message)                     /*{{{*/
1293 {
1294    // We have just finished downloading a Release file (it is not
1295    // verified yet)
1296
1297    string FileName = LookupTag(Message,"Filename");
1298    if (FileName.empty() == true)
1299    {
1300       Status = StatError;
1301       ErrorText = "Method gave a blank filename";
1302       return;
1303    }
1304
1305    if (FileName != DestFile)
1306    {
1307       Local = true;
1308       Desc.URI = "copy:" + FileName;
1309       QueueURI(Desc);
1310       return;
1311    }
1312
1313    // make sure to verify against the right file on I-M-S hit
1314    IMSHit = StringToBool(LookupTag(Message,"IMS-Hit"),false);
1315    if(IMSHit)
1316    {
1317       string FinalFile = _config->FindDir("Dir::State::lists");
1318       FinalFile += URItoFileName(RealURI);
1319       if (SigFile == DestFile)
1320          SigFile = FinalFile;
1321       DestFile = FinalFile;
1322    }
1323    Complete = true;
1324 }
1325                                                                         /*}}}*/
1326 void pkgAcqMetaIndex::AuthDone(string Message)                          /*{{{*/
1327 {
1328    // At this point, the gpgv method has succeeded, so there is a
1329    // valid signature from a key in the trusted keyring.  We
1330    // perform additional verification of its contents, and use them
1331    // to verify the indexes we are about to download
1332
1333    if (!MetaIndexParser->Load(DestFile))
1334    {
1335       Status = StatAuthError;
1336       ErrorText = MetaIndexParser->ErrorText;
1337       return;
1338    }
1339
1340    if (!VerifyVendor(Message))
1341    {
1342       return;
1343    }
1344
1345    if (_config->FindB("Debug::pkgAcquire::Auth", false))
1346       std::cerr << "Signature verification succeeded: "
1347                 << DestFile << std::endl;
1348
1349    // Download further indexes with verification
1350    QueueIndexes(true);
1351
1352    // is it a clearsigned MetaIndex file?
1353    if (DestFile == SigFile)
1354       return;
1355
1356    // Done, move signature file into position
1357    string VerifiedSigFile = _config->FindDir("Dir::State::lists") +
1358       URItoFileName(RealURI) + ".gpg";
1359    Rename(SigFile,VerifiedSigFile);
1360    chmod(VerifiedSigFile.c_str(),0644);
1361 }
1362                                                                         /*}}}*/
1363 void pkgAcqMetaIndex::QueueIndexes(bool verify)                         /*{{{*/
1364 {
1365 #if 0
1366    /* Reject invalid, existing Release files (LP: #346386) (Closes: #627642)
1367     * FIXME: Disabled; it breaks unsigned repositories without hashes */
1368    if (!verify && FileExists(DestFile) && !MetaIndexParser->Load(DestFile))
1369    {
1370       Status = StatError;
1371       ErrorText = MetaIndexParser->ErrorText;
1372       return;
1373    }
1374 #endif
1375    for (vector <struct IndexTarget*>::const_iterator Target = IndexTargets->begin();
1376         Target != IndexTargets->end();
1377         Target++)
1378    {
1379       HashString ExpectedIndexHash;
1380       if (verify)
1381       {
1382          const indexRecords::checkSum *Record = MetaIndexParser->Lookup((*Target)->MetaKey);
1383          if (Record == NULL)
1384          {
1385             if ((*Target)->IsOptional() == false)
1386             {
1387                Status = StatAuthError;
1388                strprintf(ErrorText, _("Unable to find expected entry '%s' in Release file (Wrong sources.list entry or malformed file)"), (*Target)->MetaKey.c_str());
1389                return;
1390             }
1391          }
1392          else
1393          {
1394             ExpectedIndexHash = Record->Hash;
1395             if (_config->FindB("Debug::pkgAcquire::Auth", false))
1396             {
1397                std::cerr << "Queueing: " << (*Target)->URI << std::endl;
1398                std::cerr << "Expected Hash: " << ExpectedIndexHash.toStr() << std::endl;
1399             }
1400             if (ExpectedIndexHash.empty() == true && (*Target)->IsOptional() == false)
1401             {
1402                Status = StatAuthError;
1403                strprintf(ErrorText, _("Unable to find hash sum for '%s' in Release file"), (*Target)->MetaKey.c_str());
1404                return;
1405             }
1406          }
1407       }
1408
1409       if ((*Target)->IsOptional() == true)
1410       {
1411          if ((*Target)->IsSubIndex() == true)
1412             new pkgAcqSubIndex(Owner, (*Target)->URI, (*Target)->Description,
1413                                 (*Target)->ShortDesc, ExpectedIndexHash);
1414          else
1415             new pkgAcqIndexTrans(Owner, *Target, ExpectedIndexHash, MetaIndexParser);
1416          continue;
1417       }
1418
1419       /* Queue Packages file (either diff or full packages files, depending
1420          on the users option) - we also check if the PDiff Index file is listed
1421          in the Meta-Index file. Ideal would be if pkgAcqDiffIndex would test this
1422          instead, but passing the required info to it is to much hassle */
1423       if(_config->FindB("Acquire::PDiffs",true) == true && (verify == false ||
1424           MetaIndexParser->Exists(string((*Target)->MetaKey).append(".diff/Index")) == true))
1425          new pkgAcqDiffIndex(Owner, (*Target)->URI, (*Target)->Description,
1426                              (*Target)->ShortDesc, ExpectedIndexHash);
1427       else
1428          new pkgAcqIndex(Owner, *Target, ExpectedIndexHash, MetaIndexParser);
1429    }
1430 }
1431                                                                         /*}}}*/
1432 bool pkgAcqMetaIndex::VerifyVendor(string Message)                      /*{{{*/
1433 {
1434    string::size_type pos;
1435
1436    // check for missing sigs (that where not fatal because otherwise we had
1437    // bombed earlier)
1438    string missingkeys;
1439    string msg = _("There is no public key available for the "
1440                   "following key IDs:\n");
1441    pos = Message.find("NO_PUBKEY ");
1442    if (pos != std::string::npos)
1443    {
1444       string::size_type start = pos+strlen("NO_PUBKEY ");
1445       string Fingerprint = Message.substr(start, Message.find("\n")-start);
1446       missingkeys += (Fingerprint);
1447    }
1448    if(!missingkeys.empty())
1449       _error->Warning("%s", string(msg+missingkeys).c_str());
1450
1451    string Transformed = MetaIndexParser->GetExpectedDist();
1452
1453    if (Transformed == "../project/experimental")
1454    {
1455       Transformed = "experimental";
1456    }
1457
1458    pos = Transformed.rfind('/');
1459    if (pos != string::npos)
1460    {
1461       Transformed = Transformed.substr(0, pos);
1462    }
1463
1464    if (Transformed == ".")
1465    {
1466       Transformed = "";
1467    }
1468
1469    if (_config->FindB("Acquire::Check-Valid-Until", true) == true &&
1470        MetaIndexParser->GetValidUntil() > 0) {
1471       time_t const invalid_since = time(NULL) - MetaIndexParser->GetValidUntil();
1472       if (invalid_since > 0)
1473          // TRANSLATOR: The first %s is the URL of the bad Release file, the second is
1474          // the time since then the file is invalid - formated in the same way as in
1475          // the download progress display (e.g. 7d 3h 42min 1s)
1476          return _error->Error(
1477             _("Release file for %s is expired (invalid since %s). "
1478               "Updates for this repository will not be applied."),
1479             RealURI.c_str(), TimeToStr(invalid_since).c_str());
1480    }
1481
1482    if (_config->FindB("Debug::pkgAcquire::Auth", false))
1483    {
1484       std::cerr << "Got Codename: " << MetaIndexParser->GetDist() << std::endl;
1485       std::cerr << "Expecting Dist: " << MetaIndexParser->GetExpectedDist() << std::endl;
1486       std::cerr << "Transformed Dist: " << Transformed << std::endl;
1487    }
1488
1489    if (MetaIndexParser->CheckDist(Transformed) == false)
1490    {
1491       // This might become fatal one day
1492 //       Status = StatAuthError;
1493 //       ErrorText = "Conflicting distribution; expected "
1494 //          + MetaIndexParser->GetExpectedDist() + " but got "
1495 //          + MetaIndexParser->GetDist();
1496 //       return false;
1497       if (!Transformed.empty())
1498       {
1499          _error->Warning(_("Conflicting distribution: %s (expected %s but got %s)"),
1500                          Desc.Description.c_str(),
1501                          Transformed.c_str(),
1502                          MetaIndexParser->GetDist().c_str());
1503       }
1504    }
1505
1506    return true;
1507 }
1508                                                                         /*}}}*/
1509 // pkgAcqMetaIndex::Failed - no Release file present or no signature file present       /*{{{*/
1510 // ---------------------------------------------------------------------
1511 /* */
1512 void pkgAcqMetaIndex::Failed(string Message,pkgAcquire::MethodConfig *Cnf)
1513 {
1514    if (AuthPass == true)
1515    {
1516       // gpgv method failed, if we have a good signature
1517       string LastGoodSigFile = _config->FindDir("Dir::State::lists");
1518       if (DestFile == SigFile)
1519          LastGoodSigFile.append(URItoFileName(RealURI));
1520       else
1521          LastGoodSigFile.append("partial/").append(URItoFileName(RealURI)).append(".gpg.reverify");
1522
1523       if(FileExists(LastGoodSigFile))
1524       {
1525          if (DestFile != SigFile)
1526          {
1527             string VerifiedSigFile = _config->FindDir("Dir::State::lists") +
1528                                         URItoFileName(RealURI) + ".gpg";
1529             Rename(LastGoodSigFile,VerifiedSigFile);
1530          }
1531          Status = StatTransientNetworkError;
1532          _error->Warning(_("A error occurred during the signature "
1533                            "verification. The repository is not updated "
1534                            "and the previous index files will be used. "
1535                            "GPG error: %s: %s\n"),
1536                          Desc.Description.c_str(),
1537                          LookupTag(Message,"Message").c_str());
1538          RunScripts("APT::Update::Auth-Failure");
1539          return;
1540       } else if (LookupTag(Message,"Message").find("NODATA") != string::npos) {
1541          /* Invalid signature file, reject (LP: #346386) (Closes: #627642) */
1542          _error->Error(_("GPG error: %s: %s"),
1543                          Desc.Description.c_str(),
1544                          LookupTag(Message,"Message").c_str());
1545          return;
1546       } else {
1547          _error->Warning(_("GPG error: %s: %s"),
1548                          Desc.Description.c_str(),
1549                          LookupTag(Message,"Message").c_str());
1550       }
1551       // gpgv method failed
1552       ReportMirrorFailure("GPGFailure");
1553    }
1554
1555    /* Always move the meta index, even if gpgv failed. This ensures
1556     * that PackageFile objects are correctly filled in */
1557    if (FileExists(DestFile)) {
1558       string FinalFile = _config->FindDir("Dir::State::lists");
1559       FinalFile += URItoFileName(RealURI);
1560       /* InRelease files become Release files, otherwise
1561        * they would be considered as trusted later on */
1562       if (SigFile == DestFile) {
1563          RealURI = RealURI.replace(RealURI.rfind("InRelease"), 9,
1564                                        "Release");
1565          FinalFile = FinalFile.replace(FinalFile.rfind("InRelease"), 9,
1566                                        "Release");
1567          SigFile = FinalFile;
1568       }
1569       Rename(DestFile,FinalFile);
1570       chmod(FinalFile.c_str(),0644);
1571
1572       DestFile = FinalFile;
1573    }
1574
1575    // No Release file was present, or verification failed, so fall
1576    // back to queueing Packages files without verification
1577    QueueIndexes(false);
1578 }
1579                                                                         /*}}}*/
1580 pkgAcqMetaClearSig::pkgAcqMetaClearSig(pkgAcquire *Owner,               /*{{{*/
1581                 string const &URI, string const &URIDesc, string const &ShortDesc,
1582                 string const &MetaIndexURI, string const &MetaIndexURIDesc, string const &MetaIndexShortDesc,
1583                 string const &MetaSigURI, string const &MetaSigURIDesc, string const &MetaSigShortDesc,
1584                 const vector<struct IndexTarget*>* IndexTargets,
1585                 indexRecords* MetaIndexParser) :
1586         pkgAcqMetaIndex(Owner, URI, URIDesc, ShortDesc, "", IndexTargets, MetaIndexParser),
1587         MetaIndexURI(MetaIndexURI), MetaIndexURIDesc(MetaIndexURIDesc), MetaIndexShortDesc(MetaIndexShortDesc),
1588         MetaSigURI(MetaSigURI), MetaSigURIDesc(MetaSigURIDesc), MetaSigShortDesc(MetaSigShortDesc)
1589 {
1590    SigFile = DestFile;
1591 }
1592                                                                         /*}}}*/
1593 // pkgAcqMetaClearSig::Custom600Headers - Insert custom request headers /*{{{*/
1594 // ---------------------------------------------------------------------
1595 // FIXME: this can go away once the InRelease file is used widely
1596 string pkgAcqMetaClearSig::Custom600Headers()
1597 {
1598    string Final = _config->FindDir("Dir::State::lists");
1599    Final += URItoFileName(RealURI);
1600
1601    struct stat Buf;
1602    if (stat(Final.c_str(),&Buf) != 0)
1603       return "\nIndex-File: true\nFail-Ignore: true\n";
1604
1605    return "\nIndex-File: true\nFail-Ignore: true\nLast-Modified: " + TimeRFC1123(Buf.st_mtime);
1606 }
1607                                                                         /*}}}*/
1608 void pkgAcqMetaClearSig::Failed(string Message,pkgAcquire::MethodConfig *Cnf) /*{{{*/
1609 {
1610    if (AuthPass == false)
1611    {
1612       new pkgAcqMetaSig(Owner,
1613                         MetaSigURI, MetaSigURIDesc, MetaSigShortDesc,
1614                         MetaIndexURI, MetaIndexURIDesc, MetaIndexShortDesc,
1615                         IndexTargets, MetaIndexParser);
1616       if (Cnf->LocalOnly == true ||
1617           StringToBool(LookupTag(Message, "Transient-Failure"), false) == false)
1618          Dequeue();
1619    }
1620    else
1621       pkgAcqMetaIndex::Failed(Message, Cnf);
1622 }
1623                                                                         /*}}}*/
1624 // AcqArchive::AcqArchive - Constructor                                 /*{{{*/
1625 // ---------------------------------------------------------------------
1626 /* This just sets up the initial fetch environment and queues the first
1627    possibilitiy */
1628 pkgAcqArchive::pkgAcqArchive(pkgAcquire *Owner,pkgSourceList *Sources,
1629                              pkgRecords *Recs,pkgCache::VerIterator const &Version,
1630                              string &StoreFilename) :
1631                Item(Owner), Version(Version), Sources(Sources), Recs(Recs),
1632                StoreFilename(StoreFilename), Vf(Version.FileList()),
1633                Trusted(false)
1634 {
1635    Retries = _config->FindI("Acquire::Retries",0);
1636
1637    if (Version.Arch() == 0)
1638    {
1639       _error->Error(_("I wasn't able to locate a file for the %s package. "
1640                       "This might mean you need to manually fix this package. "
1641                       "(due to missing arch)"),
1642                     Version.ParentPkg().Name());
1643       return;
1644    }
1645
1646    /* We need to find a filename to determine the extension. We make the
1647       assumption here that all the available sources for this version share
1648       the same extension.. */
1649    // Skip not source sources, they do not have file fields.
1650    for (; Vf.end() == false; Vf++)
1651    {
1652       if ((Vf.File()->Flags & pkgCache::Flag::NotSource) != 0)
1653          continue;
1654       break;
1655    }
1656
1657    // Does not really matter here.. we are going to fail out below
1658    if (Vf.end() != true)
1659    {
1660       // If this fails to get a file name we will bomb out below.
1661       pkgRecords::Parser &Parse = Recs->Lookup(Vf);
1662       if (_error->PendingError() == true)
1663          return;
1664
1665       // Generate the final file name as: package_version_arch.foo
1666       StoreFilename = QuoteString(Version.ParentPkg().Name(),"_:") + '_' +
1667                       QuoteString(Version.VerStr(),"_:") + '_' +
1668                       QuoteString(Version.Arch(),"_:.") +
1669                       "." + flExtension(Parse.FileName());
1670    }
1671
1672    // check if we have one trusted source for the package. if so, switch
1673    // to "TrustedOnly" mode
1674    for (pkgCache::VerFileIterator i = Version.FileList(); i.end() == false; i++)
1675    {
1676       pkgIndexFile *Index;
1677       if (Sources->FindIndex(i.File(),Index) == false)
1678          continue;
1679       if (_config->FindB("Debug::pkgAcquire::Auth", false))
1680       {
1681          std::cerr << "Checking index: " << Index->Describe()
1682                    << "(Trusted=" << Index->IsTrusted() << ")\n";
1683       }
1684       if (Index->IsTrusted()) {
1685          Trusted = true;
1686          break;
1687       }
1688    }
1689
1690    // "allow-unauthenticated" restores apts old fetching behaviour
1691    // that means that e.g. unauthenticated file:// uris are higher
1692    // priority than authenticated http:// uris
1693    if (_config->FindB("APT::Get::AllowUnauthenticated",false) == true)
1694       Trusted = false;
1695
1696    // Select a source
1697    if (QueueNext() == false && _error->PendingError() == false)
1698       _error->Error(_("I wasn't able to locate a file for the %s package. "
1699                     "This might mean you need to manually fix this package."),
1700                     Version.ParentPkg().Name());
1701 }
1702                                                                         /*}}}*/
1703 // AcqArchive::QueueNext - Queue the next file source                   /*{{{*/
1704 // ---------------------------------------------------------------------
1705 /* This queues the next available file version for download. It checks if
1706    the archive is already available in the cache and stashs the MD5 for
1707    checking later. */
1708 bool pkgAcqArchive::QueueNext()
1709 {
1710    string const ForceHash = _config->Find("Acquire::ForceHash");
1711    for (; Vf.end() == false; Vf++)
1712    {
1713       // Ignore not source sources
1714       if ((Vf.File()->Flags & pkgCache::Flag::NotSource) != 0)
1715          continue;
1716
1717       // Try to cross match against the source list
1718       pkgIndexFile *Index;
1719       if (Sources->FindIndex(Vf.File(),Index) == false)
1720             continue;
1721
1722       // only try to get a trusted package from another source if that source
1723       // is also trusted
1724       if(Trusted && !Index->IsTrusted())
1725          continue;
1726
1727       // Grab the text package record
1728       pkgRecords::Parser &Parse = Recs->Lookup(Vf);
1729       if (_error->PendingError() == true)
1730          return false;
1731
1732       string PkgFile = Parse.FileName();
1733       if (ForceHash.empty() == false)
1734       {
1735          if(stringcasecmp(ForceHash, "sha256") == 0)
1736             ExpectedHash = HashString("SHA256", Parse.SHA256Hash());
1737          else if (stringcasecmp(ForceHash, "sha1") == 0)
1738             ExpectedHash = HashString("SHA1", Parse.SHA1Hash());
1739          else
1740             ExpectedHash = HashString("MD5Sum", Parse.MD5Hash());
1741       }
1742       else
1743       {
1744          string Hash;
1745          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)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)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)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 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 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)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 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                                                                         /*}}}*/
2070 bool IndexTarget::IsOptional() const {
2071    if (strncmp(ShortDesc.c_str(), "Translation", 11) != 0)
2072       return false;
2073    return true;
2074 }
2075 bool IndexTarget::IsSubIndex() const {
2076    if (ShortDesc != "TranslationIndex")
2077       return false;
2078    return true;
2079 }