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.empty() == false &&
 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.empty() == true)
 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.empty() == false) {
 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 and do only hashsum verification
1262          MetaIndexParser->Load(DestFile);
1263          QueueIndexes(true);
1264       }
1265       else
1266       {
1267          // There was a signature file, so pass it to gpgv for
1268          // verification
1269
1270          if (_config->FindB("Debug::pkgAcquire::Auth", false))
1271             std::cerr << "Metaindex acquired, queueing gpg verification ("
1272                       << SigFile << "," << DestFile << ")\n";
1273          AuthPass = true;
1274          Desc.URI = "gpgv:" + SigFile;
1275          QueueURI(Desc);
1276          Mode = "gpgv";
1277          return;
1278       }
1279    }
1280
1281    if (Complete == true)
1282    {
1283       string FinalFile = _config->FindDir("Dir::State::lists");
1284       FinalFile += URItoFileName(RealURI);
1285       if (SigFile == DestFile)
1286          SigFile = FinalFile;
1287       Rename(DestFile,FinalFile);
1288       chmod(FinalFile.c_str(),0644);
1289       DestFile = FinalFile;
1290    }
1291 }
1292                                                                         /*}}}*/
1293 void pkgAcqMetaIndex::RetrievalDone(string Message)                     /*{{{*/
1294 {
1295    // We have just finished downloading a Release file (it is not
1296    // verified yet)
1297
1298    string FileName = LookupTag(Message,"Filename");
1299    if (FileName.empty() == true)
1300    {
1301       Status = StatError;
1302       ErrorText = "Method gave a blank filename";
1303       return;
1304    }
1305
1306    if (FileName != DestFile)
1307    {
1308       Local = true;
1309       Desc.URI = "copy:" + FileName;
1310       QueueURI(Desc);
1311       return;
1312    }
1313
1314    // make sure to verify against the right file on I-M-S hit
1315    IMSHit = StringToBool(LookupTag(Message,"IMS-Hit"),false);
1316    if(IMSHit)
1317    {
1318       string FinalFile = _config->FindDir("Dir::State::lists");
1319       FinalFile += URItoFileName(RealURI);
1320       if (SigFile == DestFile)
1321          SigFile = FinalFile;
1322       DestFile = FinalFile;
1323    }
1324    Complete = true;
1325 }
1326                                                                         /*}}}*/
1327 void pkgAcqMetaIndex::AuthDone(string Message)                          /*{{{*/
1328 {
1329    // At this point, the gpgv method has succeeded, so there is a
1330    // valid signature from a key in the trusted keyring.  We
1331    // perform additional verification of its contents, and use them
1332    // to verify the indexes we are about to download
1333
1334    if (!MetaIndexParser->Load(DestFile))
1335    {
1336       Status = StatAuthError;
1337       ErrorText = MetaIndexParser->ErrorText;
1338       return;
1339    }
1340
1341    if (!VerifyVendor(Message))
1342    {
1343       return;
1344    }
1345
1346    if (_config->FindB("Debug::pkgAcquire::Auth", false))
1347       std::cerr << "Signature verification succeeded: "
1348                 << DestFile << std::endl;
1349
1350    // Download further indexes with verification
1351    QueueIndexes(true);
1352
1353    // is it a clearsigned MetaIndex file?
1354    if (DestFile == SigFile)
1355       return;
1356
1357    // Done, move signature file into position
1358    string VerifiedSigFile = _config->FindDir("Dir::State::lists") +
1359       URItoFileName(RealURI) + ".gpg";
1360    Rename(SigFile,VerifiedSigFile);
1361    chmod(VerifiedSigFile.c_str(),0644);
1362 }
1363                                                                         /*}}}*/
1364 void pkgAcqMetaIndex::QueueIndexes(bool verify)                         /*{{{*/
1365 {
1366 #if 0
1367    /* Reject invalid, existing Release files (LP: #346386) (Closes: #627642)
1368     * FIXME: Disabled; it breaks unsigned repositories without hashes */
1369    if (!verify && FileExists(DestFile) && !MetaIndexParser->Load(DestFile))
1370    {
1371       Status = StatError;
1372       ErrorText = MetaIndexParser->ErrorText;
1373       return;
1374    }
1375 #endif
1376    for (vector <struct IndexTarget*>::const_iterator Target = IndexTargets->begin();
1377         Target != IndexTargets->end();
1378         ++Target)
1379    {
1380       HashString ExpectedIndexHash;
1381       if (verify)
1382       {
1383          const indexRecords::checkSum *Record = MetaIndexParser->Lookup((*Target)->MetaKey);
1384          if (Record == NULL)
1385          {
1386             if ((*Target)->IsOptional() == false)
1387             {
1388                Status = StatAuthError;
1389                strprintf(ErrorText, _("Unable to find expected entry '%s' in Release file (Wrong sources.list entry or malformed file)"), (*Target)->MetaKey.c_str());
1390                return;
1391             }
1392          }
1393          else
1394          {
1395             ExpectedIndexHash = Record->Hash;
1396             if (_config->FindB("Debug::pkgAcquire::Auth", false))
1397             {
1398                std::cerr << "Queueing: " << (*Target)->URI << std::endl;
1399                std::cerr << "Expected Hash: " << ExpectedIndexHash.toStr() << std::endl;
1400             }
1401             if (ExpectedIndexHash.empty() == true && (*Target)->IsOptional() == false)
1402             {
1403                Status = StatAuthError;
1404                strprintf(ErrorText, _("Unable to find hash sum for '%s' in Release file"), (*Target)->MetaKey.c_str());
1405                return;
1406             }
1407          }
1408       }
1409
1410       if ((*Target)->IsOptional() == true)
1411       {
1412          if ((*Target)->IsSubIndex() == true)
1413             new pkgAcqSubIndex(Owner, (*Target)->URI, (*Target)->Description,
1414                                 (*Target)->ShortDesc, ExpectedIndexHash);
1415          else
1416             new pkgAcqIndexTrans(Owner, *Target, ExpectedIndexHash, MetaIndexParser);
1417          continue;
1418       }
1419
1420       /* Queue Packages file (either diff or full packages files, depending
1421          on the users option) - we also check if the PDiff Index file is listed
1422          in the Meta-Index file. Ideal would be if pkgAcqDiffIndex would test this
1423          instead, but passing the required info to it is to much hassle */
1424       if(_config->FindB("Acquire::PDiffs",true) == true && (verify == false ||
1425           MetaIndexParser->Exists(string((*Target)->MetaKey).append(".diff/Index")) == true))
1426          new pkgAcqDiffIndex(Owner, (*Target)->URI, (*Target)->Description,
1427                              (*Target)->ShortDesc, ExpectedIndexHash);
1428       else
1429          new pkgAcqIndex(Owner, *Target, ExpectedIndexHash, MetaIndexParser);
1430    }
1431 }
1432                                                                         /*}}}*/
1433 bool pkgAcqMetaIndex::VerifyVendor(string Message)                      /*{{{*/
1434 {
1435    string::size_type pos;
1436
1437    // check for missing sigs (that where not fatal because otherwise we had
1438    // bombed earlier)
1439    string missingkeys;
1440    string msg = _("There is no public key available for the "
1441                   "following key IDs:\n");
1442    pos = Message.find("NO_PUBKEY ");
1443    if (pos != std::string::npos)
1444    {
1445       string::size_type start = pos+strlen("NO_PUBKEY ");
1446       string Fingerprint = Message.substr(start, Message.find("\n")-start);
1447       missingkeys += (Fingerprint);
1448    }
1449    if(!missingkeys.empty())
1450       _error->Warning("%s", string(msg+missingkeys).c_str());
1451
1452    string Transformed = MetaIndexParser->GetExpectedDist();
1453
1454    if (Transformed == "../project/experimental")
1455    {
1456       Transformed = "experimental";
1457    }
1458
1459    pos = Transformed.rfind('/');
1460    if (pos != string::npos)
1461    {
1462       Transformed = Transformed.substr(0, pos);
1463    }
1464
1465    if (Transformed == ".")
1466    {
1467       Transformed = "";
1468    }
1469
1470    if (_config->FindB("Acquire::Check-Valid-Until", true) == true &&
1471        MetaIndexParser->GetValidUntil() > 0) {
1472       time_t const invalid_since = time(NULL) - MetaIndexParser->GetValidUntil();
1473       if (invalid_since > 0)
1474          // TRANSLATOR: The first %s is the URL of the bad Release file, the second is
1475          // the time since then the file is invalid - formated in the same way as in
1476          // the download progress display (e.g. 7d 3h 42min 1s)
1477          return _error->Error(
1478             _("Release file for %s is expired (invalid since %s). "
1479               "Updates for this repository will not be applied."),
1480             RealURI.c_str(), TimeToStr(invalid_since).c_str());
1481    }
1482
1483    if (_config->FindB("Debug::pkgAcquire::Auth", false))
1484    {
1485       std::cerr << "Got Codename: " << MetaIndexParser->GetDist() << std::endl;
1486       std::cerr << "Expecting Dist: " << MetaIndexParser->GetExpectedDist() << std::endl;
1487       std::cerr << "Transformed Dist: " << Transformed << std::endl;
1488    }
1489
1490    if (MetaIndexParser->CheckDist(Transformed) == false)
1491    {
1492       // This might become fatal one day
1493 //       Status = StatAuthError;
1494 //       ErrorText = "Conflicting distribution; expected "
1495 //          + MetaIndexParser->GetExpectedDist() + " but got "
1496 //          + MetaIndexParser->GetDist();
1497 //       return false;
1498       if (!Transformed.empty())
1499       {
1500          _error->Warning(_("Conflicting distribution: %s (expected %s but got %s)"),
1501                          Desc.Description.c_str(),
1502                          Transformed.c_str(),
1503                          MetaIndexParser->GetDist().c_str());
1504       }
1505    }
1506
1507    return true;
1508 }
1509                                                                         /*}}}*/
1510 // pkgAcqMetaIndex::Failed - no Release file present or no signature file present       /*{{{*/
1511 // ---------------------------------------------------------------------
1512 /* */
1513 void pkgAcqMetaIndex::Failed(string Message,pkgAcquire::MethodConfig *Cnf)
1514 {
1515    if (AuthPass == true)
1516    {
1517       // gpgv method failed, if we have a good signature
1518       string LastGoodSigFile = _config->FindDir("Dir::State::lists");
1519       if (DestFile == SigFile)
1520          LastGoodSigFile.append(URItoFileName(RealURI));
1521       else
1522          LastGoodSigFile.append("partial/").append(URItoFileName(RealURI)).append(".gpg.reverify");
1523
1524       if(FileExists(LastGoodSigFile))
1525       {
1526          if (DestFile != SigFile)
1527          {
1528             string VerifiedSigFile = _config->FindDir("Dir::State::lists") +
1529                                         URItoFileName(RealURI) + ".gpg";
1530             Rename(LastGoodSigFile,VerifiedSigFile);
1531          }
1532          Status = StatTransientNetworkError;
1533          _error->Warning(_("A error occurred during the signature "
1534                            "verification. The repository is not updated "
1535                            "and the previous index files will be used. "
1536                            "GPG error: %s: %s\n"),
1537                          Desc.Description.c_str(),
1538                          LookupTag(Message,"Message").c_str());
1539          RunScripts("APT::Update::Auth-Failure");
1540          return;
1541       } else if (LookupTag(Message,"Message").find("NODATA") != string::npos) {
1542          /* Invalid signature file, reject (LP: #346386) (Closes: #627642) */
1543          _error->Error(_("GPG error: %s: %s"),
1544                          Desc.Description.c_str(),
1545                          LookupTag(Message,"Message").c_str());
1546          return;
1547       } else {
1548          _error->Warning(_("GPG error: %s: %s"),
1549                          Desc.Description.c_str(),
1550                          LookupTag(Message,"Message").c_str());
1551       }
1552       // gpgv method failed
1553       ReportMirrorFailure("GPGFailure");
1554    }
1555
1556    /* Always move the meta index, even if gpgv failed. This ensures
1557     * that PackageFile objects are correctly filled in */
1558    if (FileExists(DestFile)) {
1559       string FinalFile = _config->FindDir("Dir::State::lists");
1560       FinalFile += URItoFileName(RealURI);
1561       /* InRelease files become Release files, otherwise
1562        * they would be considered as trusted later on */
1563       if (SigFile == DestFile) {
1564          RealURI = RealURI.replace(RealURI.rfind("InRelease"), 9,
1565                                        "Release");
1566          FinalFile = FinalFile.replace(FinalFile.rfind("InRelease"), 9,
1567                                        "Release");
1568          SigFile = FinalFile;
1569       }
1570       Rename(DestFile,FinalFile);
1571       chmod(FinalFile.c_str(),0644);
1572
1573       DestFile = FinalFile;
1574    }
1575
1576    // No Release file was present, or verification failed, so fall
1577    // back to queueing Packages files without verification
1578    QueueIndexes(false);
1579 }
1580                                                                         /*}}}*/
1581 pkgAcqMetaClearSig::pkgAcqMetaClearSig(pkgAcquire *Owner,               /*{{{*/
1582                 string const &URI, string const &URIDesc, string const &ShortDesc,
1583                 string const &MetaIndexURI, string const &MetaIndexURIDesc, string const &MetaIndexShortDesc,
1584                 string const &MetaSigURI, string const &MetaSigURIDesc, string const &MetaSigShortDesc,
1585                 const vector<struct IndexTarget*>* IndexTargets,
1586                 indexRecords* MetaIndexParser) :
1587         pkgAcqMetaIndex(Owner, URI, URIDesc, ShortDesc, "", IndexTargets, MetaIndexParser),
1588         MetaIndexURI(MetaIndexURI), MetaIndexURIDesc(MetaIndexURIDesc), MetaIndexShortDesc(MetaIndexShortDesc),
1589         MetaSigURI(MetaSigURI), MetaSigURIDesc(MetaSigURIDesc), MetaSigShortDesc(MetaSigShortDesc)
1590 {
1591    SigFile = DestFile;
1592 }
1593                                                                         /*}}}*/
1594 // pkgAcqMetaClearSig::Custom600Headers - Insert custom request headers /*{{{*/
1595 // ---------------------------------------------------------------------
1596 // FIXME: this can go away once the InRelease file is used widely
1597 string pkgAcqMetaClearSig::Custom600Headers()
1598 {
1599    string Final = _config->FindDir("Dir::State::lists");
1600    Final += URItoFileName(RealURI);
1601
1602    struct stat Buf;
1603    if (stat(Final.c_str(),&Buf) != 0)
1604       return "\nIndex-File: true\nFail-Ignore: true\n";
1605
1606    return "\nIndex-File: true\nFail-Ignore: true\nLast-Modified: " + TimeRFC1123(Buf.st_mtime);
1607 }
1608                                                                         /*}}}*/
1609 void pkgAcqMetaClearSig::Failed(string Message,pkgAcquire::MethodConfig *Cnf) /*{{{*/
1610 {
1611    if (AuthPass == false)
1612    {
1613       new pkgAcqMetaSig(Owner,
1614                         MetaSigURI, MetaSigURIDesc, MetaSigShortDesc,
1615                         MetaIndexURI, MetaIndexURIDesc, MetaIndexShortDesc,
1616                         IndexTargets, MetaIndexParser);
1617       if (Cnf->LocalOnly == true ||
1618           StringToBool(LookupTag(Message, "Transient-Failure"), false) == false)
1619          Dequeue();
1620    }
1621    else
1622       pkgAcqMetaIndex::Failed(Message, Cnf);
1623 }
1624                                                                         /*}}}*/
1625 // AcqArchive::AcqArchive - Constructor                                 /*{{{*/
1626 // ---------------------------------------------------------------------
1627 /* This just sets up the initial fetch environment and queues the first
1628    possibilitiy */
1629 pkgAcqArchive::pkgAcqArchive(pkgAcquire *Owner,pkgSourceList *Sources,
1630                              pkgRecords *Recs,pkgCache::VerIterator const &Version,
1631                              string &StoreFilename) :
1632                Item(Owner), Version(Version), Sources(Sources), Recs(Recs),
1633                StoreFilename(StoreFilename), Vf(Version.FileList()),
1634                Trusted(false)
1635 {
1636    Retries = _config->FindI("Acquire::Retries",0);
1637
1638    if (Version.Arch() == 0)
1639    {
1640       _error->Error(_("I wasn't able to locate a file for the %s package. "
1641                       "This might mean you need to manually fix this package. "
1642                       "(due to missing arch)"),
1643                     Version.ParentPkg().Name());
1644       return;
1645    }
1646
1647    /* We need to find a filename to determine the extension. We make the
1648       assumption here that all the available sources for this version share
1649       the same extension.. */
1650    // Skip not source sources, they do not have file fields.
1651    for (; Vf.end() == false; Vf++)
1652    {
1653       if ((Vf.File()->Flags & pkgCache::Flag::NotSource) != 0)
1654          continue;
1655       break;
1656    }
1657
1658    // Does not really matter here.. we are going to fail out below
1659    if (Vf.end() != true)
1660    {
1661       // If this fails to get a file name we will bomb out below.
1662       pkgRecords::Parser &Parse = Recs->Lookup(Vf);
1663       if (_error->PendingError() == true)
1664          return;
1665
1666       // Generate the final file name as: package_version_arch.foo
1667       StoreFilename = QuoteString(Version.ParentPkg().Name(),"_:") + '_' +
1668                       QuoteString(Version.VerStr(),"_:") + '_' +
1669                       QuoteString(Version.Arch(),"_:.") +
1670                       "." + flExtension(Parse.FileName());
1671    }
1672
1673    // check if we have one trusted source for the package. if so, switch
1674    // to "TrustedOnly" mode
1675    for (pkgCache::VerFileIterator i = Version.FileList(); i.end() == false; ++i)
1676    {
1677       pkgIndexFile *Index;
1678       if (Sources->FindIndex(i.File(),Index) == false)
1679          continue;
1680       if (_config->FindB("Debug::pkgAcquire::Auth", false))
1681       {
1682          std::cerr << "Checking index: " << Index->Describe()
1683                    << "(Trusted=" << Index->IsTrusted() << ")\n";
1684       }
1685       if (Index->IsTrusted()) {
1686          Trusted = true;
1687          break;
1688       }
1689    }
1690
1691    // "allow-unauthenticated" restores apts old fetching behaviour
1692    // that means that e.g. unauthenticated file:// uris are higher
1693    // priority than authenticated http:// uris
1694    if (_config->FindB("APT::Get::AllowUnauthenticated",false) == true)
1695       Trusted = false;
1696
1697    // Select a source
1698    if (QueueNext() == false && _error->PendingError() == false)
1699       _error->Error(_("I wasn't able to locate a file for the %s package. "
1700                     "This might mean you need to manually fix this package."),
1701                     Version.ParentPkg().Name());
1702 }
1703                                                                         /*}}}*/
1704 // AcqArchive::QueueNext - Queue the next file source                   /*{{{*/
1705 // ---------------------------------------------------------------------
1706 /* This queues the next available file version for download. It checks if
1707    the archive is already available in the cache and stashs the MD5 for
1708    checking later. */
1709 bool pkgAcqArchive::QueueNext()
1710 {
1711    string const ForceHash = _config->Find("Acquire::ForceHash");
1712    for (; Vf.end() == false; ++Vf)
1713    {
1714       // Ignore not source sources
1715       if ((Vf.File()->Flags & pkgCache::Flag::NotSource) != 0)
1716          continue;
1717
1718       // Try to cross match against the source list
1719       pkgIndexFile *Index;
1720       if (Sources->FindIndex(Vf.File(),Index) == false)
1721             continue;
1722
1723       // only try to get a trusted package from another source if that source
1724       // is also trusted
1725       if(Trusted && !Index->IsTrusted())
1726          continue;
1727
1728       // Grab the text package record
1729       pkgRecords::Parser &Parse = Recs->Lookup(Vf);
1730       if (_error->PendingError() == true)
1731          return false;
1732
1733       string PkgFile = Parse.FileName();
1734       if (ForceHash.empty() == false)
1735       {
1736          if(stringcasecmp(ForceHash, "sha256") == 0)
1737             ExpectedHash = HashString("SHA256", Parse.SHA256Hash());
1738          else if (stringcasecmp(ForceHash, "sha1") == 0)
1739             ExpectedHash = HashString("SHA1", Parse.SHA1Hash());
1740          else
1741             ExpectedHash = HashString("MD5Sum", Parse.MD5Hash());
1742       }
1743       else
1744       {
1745          string Hash;
1746          if ((Hash = Parse.SHA256Hash()).empty() == false)
1747             ExpectedHash = HashString("SHA256", Hash);
1748          else if ((Hash = Parse.SHA1Hash()).empty() == false)
1749             ExpectedHash = HashString("SHA1", Hash);
1750          else
1751             ExpectedHash = HashString("MD5Sum", Parse.MD5Hash());
1752       }
1753       if (PkgFile.empty() == true)
1754          return _error->Error(_("The package index files are corrupted. No Filename: "
1755                               "field for package %s."),
1756                               Version.ParentPkg().Name());
1757
1758       Desc.URI = Index->ArchiveURI(PkgFile);
1759       Desc.Description = Index->ArchiveInfo(Version);
1760       Desc.Owner = this;
1761       Desc.ShortDesc = Version.ParentPkg().Name();
1762
1763       // See if we already have the file. (Legacy filenames)
1764       FileSize = Version->Size;
1765       string FinalFile = _config->FindDir("Dir::Cache::Archives") + flNotDir(PkgFile);
1766       struct stat Buf;
1767       if (stat(FinalFile.c_str(),&Buf) == 0)
1768       {
1769          // Make sure the size matches
1770          if ((unsigned)Buf.st_size == Version->Size)
1771          {
1772             Complete = true;
1773             Local = true;
1774             Status = StatDone;
1775             StoreFilename = DestFile = FinalFile;
1776             return true;
1777          }
1778
1779          /* Hmm, we have a file and its size does not match, this means it is
1780             an old style mismatched arch */
1781          unlink(FinalFile.c_str());
1782       }
1783
1784       // Check it again using the new style output filenames
1785       FinalFile = _config->FindDir("Dir::Cache::Archives") + flNotDir(StoreFilename);
1786       if (stat(FinalFile.c_str(),&Buf) == 0)
1787       {
1788          // Make sure the size matches
1789          if ((unsigned)Buf.st_size == Version->Size)
1790          {
1791             Complete = true;
1792             Local = true;
1793             Status = StatDone;
1794             StoreFilename = DestFile = FinalFile;
1795             return true;
1796          }
1797
1798          /* Hmm, we have a file and its size does not match, this shouldnt
1799             happen.. */
1800          unlink(FinalFile.c_str());
1801       }
1802
1803       DestFile = _config->FindDir("Dir::Cache::Archives") + "partial/" + flNotDir(StoreFilename);
1804
1805       // Check the destination file
1806       if (stat(DestFile.c_str(),&Buf) == 0)
1807       {
1808          // Hmm, the partial file is too big, erase it
1809          if ((unsigned)Buf.st_size > Version->Size)
1810             unlink(DestFile.c_str());
1811          else
1812             PartialSize = Buf.st_size;
1813       }
1814
1815       // Create the item
1816       Local = false;
1817       Desc.URI = Index->ArchiveURI(PkgFile);
1818       Desc.Description = Index->ArchiveInfo(Version);
1819       Desc.Owner = this;
1820       Desc.ShortDesc = Version.ParentPkg().Name();
1821       QueueURI(Desc);
1822
1823       ++Vf;
1824       return true;
1825    }
1826    return false;
1827 }
1828                                                                         /*}}}*/
1829 // AcqArchive::Done - Finished fetching                                 /*{{{*/
1830 // ---------------------------------------------------------------------
1831 /* */
1832 void pkgAcqArchive::Done(string Message,unsigned long Size,string CalcHash,
1833                          pkgAcquire::MethodConfig *Cfg)
1834 {
1835    Item::Done(Message,Size,CalcHash,Cfg);
1836
1837    // Check the size
1838    if (Size != Version->Size)
1839    {
1840       Status = StatError;
1841       ErrorText = _("Size mismatch");
1842       return;
1843    }
1844
1845    // Check the hash
1846    if(ExpectedHash.toStr() != CalcHash)
1847    {
1848       Status = StatError;
1849       ErrorText = _("Hash Sum mismatch");
1850       if(FileExists(DestFile))
1851          Rename(DestFile,DestFile + ".FAILED");
1852       return;
1853    }
1854
1855    // Grab the output filename
1856    string FileName = LookupTag(Message,"Filename");
1857    if (FileName.empty() == true)
1858    {
1859       Status = StatError;
1860       ErrorText = "Method gave a blank filename";
1861       return;
1862    }
1863
1864    Complete = true;
1865
1866    // Reference filename
1867    if (FileName != DestFile)
1868    {
1869       StoreFilename = DestFile = FileName;
1870       Local = true;
1871       return;
1872    }
1873
1874    // Done, move it into position
1875    string FinalFile = _config->FindDir("Dir::Cache::Archives");
1876    FinalFile += flNotDir(StoreFilename);
1877    Rename(DestFile,FinalFile);
1878
1879    StoreFilename = DestFile = FinalFile;
1880    Complete = true;
1881 }
1882                                                                         /*}}}*/
1883 // AcqArchive::Failed - Failure handler                                 /*{{{*/
1884 // ---------------------------------------------------------------------
1885 /* Here we try other sources */
1886 void pkgAcqArchive::Failed(string Message,pkgAcquire::MethodConfig *Cnf)
1887 {
1888    ErrorText = LookupTag(Message,"Message");
1889
1890    /* We don't really want to retry on failed media swaps, this prevents
1891       that. An interesting observation is that permanent failures are not
1892       recorded. */
1893    if (Cnf->Removable == true &&
1894        StringToBool(LookupTag(Message,"Transient-Failure"),false) == true)
1895    {
1896       // Vf = Version.FileList();
1897       while (Vf.end() == false) ++Vf;
1898       StoreFilename = string();
1899       Item::Failed(Message,Cnf);
1900       return;
1901    }
1902
1903    if (QueueNext() == false)
1904    {
1905       // This is the retry counter
1906       if (Retries != 0 &&
1907           Cnf->LocalOnly == false &&
1908           StringToBool(LookupTag(Message,"Transient-Failure"),false) == true)
1909       {
1910          Retries--;
1911          Vf = Version.FileList();
1912          if (QueueNext() == true)
1913             return;
1914       }
1915
1916       StoreFilename = string();
1917       Item::Failed(Message,Cnf);
1918    }
1919 }
1920                                                                         /*}}}*/
1921 // AcqArchive::IsTrusted - Determine whether this archive comes from a trusted source /*{{{*/
1922 // ---------------------------------------------------------------------
1923 bool pkgAcqArchive::IsTrusted()
1924 {
1925    return Trusted;
1926 }
1927                                                                         /*}}}*/
1928 // AcqArchive::Finished - Fetching has finished, tidy up                /*{{{*/
1929 // ---------------------------------------------------------------------
1930 /* */
1931 void pkgAcqArchive::Finished()
1932 {
1933    if (Status == pkgAcquire::Item::StatDone &&
1934        Complete == true)
1935       return;
1936    StoreFilename = string();
1937 }
1938                                                                         /*}}}*/
1939 // AcqFile::pkgAcqFile - Constructor                                    /*{{{*/
1940 // ---------------------------------------------------------------------
1941 /* The file is added to the queue */
1942 pkgAcqFile::pkgAcqFile(pkgAcquire *Owner,string URI,string Hash,
1943                        unsigned long Size,string Dsc,string ShortDesc,
1944                        const string &DestDir, const string &DestFilename,
1945                        bool IsIndexFile) :
1946                        Item(Owner), ExpectedHash(Hash), IsIndexFile(IsIndexFile)
1947 {
1948    Retries = _config->FindI("Acquire::Retries",0);
1949
1950    if(!DestFilename.empty())
1951       DestFile = DestFilename;
1952    else if(!DestDir.empty())
1953       DestFile = DestDir + "/" + flNotDir(URI);
1954    else
1955       DestFile = flNotDir(URI);
1956
1957    // Create the item
1958    Desc.URI = URI;
1959    Desc.Description = Dsc;
1960    Desc.Owner = this;
1961
1962    // Set the short description to the archive component
1963    Desc.ShortDesc = ShortDesc;
1964
1965    // Get the transfer sizes
1966    FileSize = Size;
1967    struct stat Buf;
1968    if (stat(DestFile.c_str(),&Buf) == 0)
1969    {
1970       // Hmm, the partial file is too big, erase it
1971       if ((unsigned)Buf.st_size > Size)
1972          unlink(DestFile.c_str());
1973       else
1974          PartialSize = Buf.st_size;
1975    }
1976
1977    QueueURI(Desc);
1978 }
1979                                                                         /*}}}*/
1980 // AcqFile::Done - Item downloaded OK                                   /*{{{*/
1981 // ---------------------------------------------------------------------
1982 /* */
1983 void pkgAcqFile::Done(string Message,unsigned long Size,string CalcHash,
1984                       pkgAcquire::MethodConfig *Cnf)
1985 {
1986    Item::Done(Message,Size,CalcHash,Cnf);
1987
1988    // Check the hash
1989    if(!ExpectedHash.empty() && ExpectedHash.toStr() != CalcHash)
1990    {
1991       Status = StatError;
1992       ErrorText = _("Hash Sum mismatch");
1993       Rename(DestFile,DestFile + ".FAILED");
1994       return;
1995    }
1996
1997    string FileName = LookupTag(Message,"Filename");
1998    if (FileName.empty() == true)
1999    {
2000       Status = StatError;
2001       ErrorText = "Method gave a blank filename";
2002       return;
2003    }
2004
2005    Complete = true;
2006
2007    // The files timestamp matches
2008    if (StringToBool(LookupTag(Message,"IMS-Hit"),false) == true)
2009       return;
2010
2011    // We have to copy it into place
2012    if (FileName != DestFile)
2013    {
2014       Local = true;
2015       if (_config->FindB("Acquire::Source-Symlinks",true) == false ||
2016           Cnf->Removable == true)
2017       {
2018          Desc.URI = "copy:" + FileName;
2019          QueueURI(Desc);
2020          return;
2021       }
2022
2023       // Erase the file if it is a symlink so we can overwrite it
2024       struct stat St;
2025       if (lstat(DestFile.c_str(),&St) == 0)
2026       {
2027          if (S_ISLNK(St.st_mode) != 0)
2028             unlink(DestFile.c_str());
2029       }
2030
2031       // Symlink the file
2032       if (symlink(FileName.c_str(),DestFile.c_str()) != 0)
2033       {
2034          ErrorText = "Link to " + DestFile + " failure ";
2035          Status = StatError;
2036          Complete = false;
2037       }
2038    }
2039 }
2040                                                                         /*}}}*/
2041 // AcqFile::Failed - Failure handler                                    /*{{{*/
2042 // ---------------------------------------------------------------------
2043 /* Here we try other sources */
2044 void pkgAcqFile::Failed(string Message,pkgAcquire::MethodConfig *Cnf)
2045 {
2046    ErrorText = LookupTag(Message,"Message");
2047
2048    // This is the retry counter
2049    if (Retries != 0 &&
2050        Cnf->LocalOnly == false &&
2051        StringToBool(LookupTag(Message,"Transient-Failure"),false) == true)
2052    {
2053       Retries--;
2054       QueueURI(Desc);
2055       return;
2056    }
2057
2058    Item::Failed(Message,Cnf);
2059 }
2060                                                                         /*}}}*/
2061 // AcqIndex::Custom600Headers - Insert custom request headers           /*{{{*/
2062 // ---------------------------------------------------------------------
2063 /* The only header we use is the last-modified header. */
2064 string pkgAcqFile::Custom600Headers()
2065 {
2066    if (IsIndexFile)
2067       return "\nIndex-File: true";
2068    return "";
2069 }
2070                                                                         /*}}}*/
2071 bool IndexTarget::IsOptional() const {
2072    if (strncmp(ShortDesc.c_str(), "Translation", 11) != 0)
2073       return false;
2074    return true;
2075 }
2076 bool IndexTarget::IsSubIndex() const {
2077    if (ShortDesc != "TranslationIndex")
2078       return false;
2079    return true;
2080 }