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 #ifdef __GNUG__
  17 #pragma implementation "apt-pkg/acquire-item.h"
  18 #endif
  19 #include <apt-pkg/acquire-item.h>
  20 #include <apt-pkg/configuration.h>
  21 #include <apt-pkg/sourcelist.h>
  22 #include <apt-pkg/vendorlist.h>
  23 #include <apt-pkg/error.h>
  24 #include <apt-pkg/strutl.h>
  25 #include <apt-pkg/fileutl.h>
  26 #include <apt-pkg/md5.h>
  27 #include <apt-pkg/sha1.h>
  28 #include <apt-pkg/tagfile.h>
  29
  30 #include <apti18n.h>
  31
  32 #include <sys/stat.h>
  33 #include <unistd.h>
  34 #include <errno.h>
  35 #include <string>
  36 #include <sstream>
  37 #include <stdio.h>
  38                                                                         /*}}}*/
  39
  40 using namespace std;
  41
  42 // Acquire::Item::Item - Constructor                                    /*{{{*/
  43 // ---------------------------------------------------------------------
  44 /* */
  45 pkgAcquire::Item::Item(pkgAcquire *Owner) : Owner(Owner), FileSize(0),
  46                        PartialSize(0), Mode(0), ID(0), Complete(false),
  47                        Local(false), QueueCounter(0)
  48 {
  49    Owner->Add(this);
  50    Status = StatIdle;
  51 }
  52                                                                         /*}}}*/
  53 // Acquire::Item::~Item - Destructor                                    /*{{{*/
  54 // ---------------------------------------------------------------------
  55 /* */
  56 pkgAcquire::Item::~Item()
  57 {
  58    Owner->Remove(this);
  59 }
  60                                                                         /*}}}*/
  61 // Acquire::Item::Failed - Item failed to download                      /*{{{*/
  62 // ---------------------------------------------------------------------
  63 /* We return to an idle state if there are still other queues that could
  64    fetch this object */
  65 void pkgAcquire::Item::Failed(string Message,pkgAcquire::MethodConfig *Cnf)
  66 {
  67    Status = StatIdle;
  68    ErrorText = LookupTag(Message,"Message");
  69    if (QueueCounter <= 1)
  70    {
  71       /* This indicates that the file is not available right now but might
  72          be sometime later. If we do a retry cycle then this should be
  73          retried [CDROMs] */
  74       if (Cnf->LocalOnly == true &&
  75           StringToBool(LookupTag(Message,"Transient-Failure"),false) == true)
  76       {
  77          Status = StatIdle;
  78          Dequeue();
  79          return;
  80       }
  81
  82       Status = StatError;
  83       Dequeue();
  84    }
  85 }
  86                                                                         /*}}}*/
  87 // Acquire::Item::Start - Item has begun to download                    /*{{{*/
  88 // ---------------------------------------------------------------------
  89 /* Stash status and the file size. Note that setting Complete means
  90    sub-phases of the acquire process such as decompresion are operating */
  91 void pkgAcquire::Item::Start(string /*Message*/,unsigned long Size)
  92 {
  93    Status = StatFetching;
  94    if (FileSize == 0 && Complete == false)
  95       FileSize = Size;
  96 }
  97                                                                         /*}}}*/
  98 // Acquire::Item::Done - Item downloaded OK                             /*{{{*/
  99 // ---------------------------------------------------------------------
 100 /* */
 101 void pkgAcquire::Item::Done(string Message,unsigned long Size,string,
 102                             pkgAcquire::MethodConfig *Cnf)
 103 {
 104    // We just downloaded something..
 105    string FileName = LookupTag(Message,"Filename");
 106    // we only inform the Log class if it was actually not a local thing
 107    if (Complete == false && !Local && FileName == DestFile)
 108    {
 109       if (Owner->Log != 0)
 110          Owner->Log->Fetched(Size,atoi(LookupTag(Message,"Resume-Point","0").c_str()));
 111    }
 112
 113    if (FileSize == 0)
 114       FileSize= Size;
 115
 116    Status = StatDone;
 117    ErrorText = string();
 118    Owner->Dequeue(this);
 119 }
 120                                                                         /*}}}*/
 121 // Acquire::Item::Rename - Rename a file                                /*{{{*/
 122 // ---------------------------------------------------------------------
 123 /* This helper function is used by alot of item methods as thier final
 124    step */
 125 void pkgAcquire::Item::Rename(string From,string To)
 126 {
 127    if (rename(From.c_str(),To.c_str()) != 0)
 128    {
 129       char S[300];
 130       snprintf(S,sizeof(S),_("rename failed, %s (%s -> %s)."),strerror(errno),
 131               From.c_str(),To.c_str());
 132       Status = StatError;
 133       ErrorText = S;
 134    }
 135 }
 136                                                                         /*}}}*/
 137
 138
 139 // AcqDiffIndex::AcqDiffIndex - Constructor
 140 // ---------------------------------------------------------------------
 141 /* Get the DiffIndex file first and see if there are patches availabe
 142  * If so, create a pkgAcqIndexDiffs fetcher that will get and apply the
 143  * patches. If anything goes wrong in that process, it will fall back to
 144  * the original packages file
 145  */
 146 pkgAcqDiffIndex::pkgAcqDiffIndex(pkgAcquire *Owner,
 147                                  string URI,string URIDesc,string ShortDesc,
 148                                  string ExpectedMD5)
 149    : Item(Owner), RealURI(URI), ExpectedMD5(ExpectedMD5), Description(URIDesc)
 150 {
 151
 152    Debug = _config->FindB("Debug::pkgAcquire::Diffs",false);
 153
 154    Desc.Description = URIDesc + "/DiffIndex";
 155    Desc.Owner = this;
 156    Desc.ShortDesc = ShortDesc;
 157    Desc.URI = URI + ".diff/Index";
 158
 159    DestFile = _config->FindDir("Dir::State::lists") + "partial/";
 160    DestFile += URItoFileName(URI) + string(".DiffIndex");
 161
 162    if(Debug)
 163       std::clog << "pkgAcqDiffIndex: " << Desc.URI << std::endl;
 164
 165    // look for the current package file
 166    CurrentPackagesFile = _config->FindDir("Dir::State::lists");
 167    CurrentPackagesFile += URItoFileName(RealURI);
 168
 169    // FIXME: this file:/ check is a hack to prevent fetching
 170    //        from local sources. this is really silly, and
 171    //        should be fixed cleanly as soon as possible
 172    if(!FileExists(CurrentPackagesFile) ||
 173       Desc.URI.substr(0,strlen("file:/")) == "file:/")
 174    {
 175       // we don't have a pkg file or we don't want to queue
 176       if(Debug)
 177          std::clog << "No index file, local or canceld by user" << std::endl;
 178       Failed("", NULL);
 179       return;
 180    }
 181
 182    if(Debug)
 183       std::clog << "pkgAcqIndexDiffs::pkgAcqIndexDiffs(): "
 184                 << CurrentPackagesFile << std::endl;
 185
 186    QueueURI(Desc);
 187
 188 }
 189
 190 // AcqIndex::Custom600Headers - Insert custom request headers           /*{{{*/
 191 // ---------------------------------------------------------------------
 192 /* The only header we use is the last-modified header. */
 193 string pkgAcqDiffIndex::Custom600Headers()
 194 {
 195    string Final = _config->FindDir("Dir::State::lists");
 196    Final += URItoFileName(RealURI) + string(".IndexDiff");
 197
 198    if(Debug)
 199       std::clog << "Custom600Header-IMS: " << Final << std::endl;
 200
 201    struct stat Buf;
 202    if (stat(Final.c_str(),&Buf) != 0)
 203       return "\nIndex-File: true";
 204
 205    return "\nIndex-File: true\nLast-Modified: " + TimeRFC1123(Buf.st_mtime);
 206 }
 207
 208
 209 bool pkgAcqDiffIndex::ParseDiffIndex(string IndexDiffFile)
 210 {
 211    if(Debug)
 212       std::clog << "pkgAcqIndexDiffs::ParseIndexDiff() " << IndexDiffFile
 213                 << std::endl;
 214
 215    pkgTagSection Tags;
 216    string ServerSha1;
 217    vector<DiffInfo> available_patches;
 218
 219    FileFd Fd(IndexDiffFile,FileFd::ReadOnly);
 220    pkgTagFile TF(&Fd);
 221    if (_error->PendingError() == true)
 222       return false;
 223
 224    if(TF.Step(Tags) == true)
 225    {
 226       string local_sha1;
 227       bool found = false;
 228       DiffInfo d;
 229       string size;
 230
 231       string tmp = Tags.FindS("SHA1-Current");
 232       std::stringstream ss(tmp);
 233       ss >> ServerSha1;
 234
 235       FileFd fd(CurrentPackagesFile, FileFd::ReadOnly);
 236       SHA1Summation SHA1;
 237       SHA1.AddFD(fd.Fd(), fd.Size());
 238       local_sha1 = string(SHA1.Result());
 239
 240       if(local_sha1 == ServerSha1)
 241       {
 242          // we have the same sha1 as the server
 243          if(Debug)
 244             std::clog << "Package file is up-to-date" << std::endl;
 245          // set found to true, this will queue a pkgAcqIndexDiffs with
 246          // a empty availabe_patches
 247          found = true;
 248       }
 249       else
 250       {
 251          if(Debug)
 252             std::clog << "SHA1-Current: " << ServerSha1 << std::endl;
 253
 254          // check the historie and see what patches we need
 255          string history = Tags.FindS("SHA1-History");
 256          std::stringstream hist(history);
 257          while(hist >> d.sha1 >> size >> d.file)
 258          {
 259             d.size = atoi(size.c_str());
 260             // read until the first match is found
 261             if(d.sha1 == local_sha1)
 262                found=true;
 263             // from that point on, we probably need all diffs
 264             if(found)
 265             {
 266                if(Debug)
 267                   std::clog << "Need to get diff: " << d.file << std::endl;
 268                available_patches.push_back(d);
 269             }
 270          }
 271       }
 272
 273       // we have something, queue the next diff
 274       if(found)
 275       {
 276          // queue the diffs
 277         int last_space = Description.rfind(" ");
 278         if(last_space != string::npos)
 279           Description.erase(last_space, Description.size()-last_space);
 280          new pkgAcqIndexDiffs(Owner, RealURI, Description, Desc.ShortDesc,
 281                               ExpectedMD5, available_patches);
 282          Complete = false;
 283          Status = StatDone;
 284          Dequeue();
 285          return true;
 286       }
 287    }
 288
 289    // Nothing found, report and return false
 290    // Failing here is ok, if we return false later, the full
 291    // IndexFile is queued
 292    if(Debug)
 293       std::clog << "Can't find a patch in the index file" << std::endl;
 294    return false;
 295 }
 296
 297 void pkgAcqDiffIndex::Failed(string Message,pkgAcquire::MethodConfig *Cnf)
 298 {
 299    if(Debug)
 300       std::clog << "pkgAcqDiffIndex failed: " << Desc.URI << std::endl
 301                 << "Falling back to normal index file aquire" << std::endl;
 302
 303    new pkgAcqIndex(Owner, RealURI, Description, Desc.ShortDesc,
 304                    ExpectedMD5);
 305
 306    Complete = false;
 307    Status = StatDone;
 308    Dequeue();
 309 }
 310
 311 void pkgAcqDiffIndex::Done(string Message,unsigned long Size,string Md5Hash,
 312                            pkgAcquire::MethodConfig *Cnf)
 313 {
 314    if(Debug)
 315       std::clog << "pkgAcqDiffIndex::Done(): " << Desc.URI << std::endl;
 316
 317    Item::Done(Message,Size,Md5Hash,Cnf);
 318
 319    string FinalFile;
 320    FinalFile = _config->FindDir("Dir::State::lists")+URItoFileName(RealURI);
 321
 322    // sucess in downloading the index
 323    // rename the index
 324    FinalFile += string(".IndexDiff");
 325    if(Debug)
 326       std::clog << "Renaming: " << DestFile << " -> " << FinalFile
 327                 << std::endl;
 328    Rename(DestFile,FinalFile);
 329    chmod(FinalFile.c_str(),0644);
 330    DestFile = FinalFile;
 331
 332    if(!ParseDiffIndex(DestFile))
 333       return Failed("", NULL);
 334
 335    Complete = true;
 336    Status = StatDone;
 337    Dequeue();
 338    return;
 339 }
 340
 341
 342
 343 // AcqIndexDiffs::AcqIndexDiffs - Constructor
 344 // ---------------------------------------------------------------------
 345 /* The package diff is added to the queue. one object is constructed
 346  * for each diff and the index
 347  */
 348 pkgAcqIndexDiffs::pkgAcqIndexDiffs(pkgAcquire *Owner,
 349                                    string URI,string URIDesc,string ShortDesc,
 350                                    string ExpectedMD5, vector<DiffInfo> diffs)
 351    : Item(Owner), RealURI(URI), ExpectedMD5(ExpectedMD5),
 352      available_patches(diffs)
 353 {
 354
 355    DestFile = _config->FindDir("Dir::State::lists") + "partial/";
 356    DestFile += URItoFileName(URI);
 357
 358    Debug = _config->FindB("Debug::pkgAcquire::Diffs",false);
 359
 360    Description = URIDesc;
 361    Desc.Owner = this;
 362    Desc.ShortDesc = ShortDesc;
 363
 364    if(available_patches.size() == 0)
 365    {
 366       // we are done (yeah!)
 367       Finish(true);
 368    }
 369    else
 370    {
 371       // get the next diff
 372       State = StateFetchDiff;
 373       QueueNextDiff();
 374    }
 375 }
 376
 377
 378 void pkgAcqIndexDiffs::Failed(string Message,pkgAcquire::MethodConfig *Cnf)
 379 {
 380    if(Debug)
 381       std::clog << "pkgAcqIndexDiffs failed: " << Desc.URI << std::endl
 382                 << "Falling back to normal index file aquire" << std::endl;
 383    new pkgAcqIndex(Owner, RealURI, Description,Desc.ShortDesc,
 384                    ExpectedMD5);
 385    Finish();
 386 }
 387
 388
 389 // helper that cleans the item out of the fetcher queue
 390 void pkgAcqIndexDiffs::Finish(bool allDone)
 391 {
 392    // we restore the original name, this is required, otherwise
 393    // the file will be cleaned
 394    if(allDone)
 395    {
 396       DestFile = _config->FindDir("Dir::State::lists");
 397       DestFile += URItoFileName(RealURI);
 398
 399       // do the final md5sum checking
 400       MD5Summation sum;
 401       FileFd Fd(DestFile, FileFd::ReadOnly);
 402       sum.AddFD(Fd.Fd(), Fd.Size());
 403       Fd.Close();
 404       string MD5 = (string)sum.Result();
 405
 406       if (!ExpectedMD5.empty() && MD5 != ExpectedMD5)
 407       {
 408          Status = StatAuthError;
 409          ErrorText = _("MD5Sum mismatch");
 410          Rename(DestFile,DestFile + ".FAILED");
 411          Dequeue();
 412          return;
 413       }
 414
 415       // this is for the "real" finish
 416       Complete = true;
 417       Status = StatDone;
 418       Dequeue();
 419       if(Debug)
 420          std::clog << "\n\nallDone: " << DestFile << "\n" << std::endl;
 421       return;
 422    }
 423
 424    if(Debug)
 425       std::clog << "Finishing: " << Desc.URI << std::endl;
 426    Complete = false;
 427    Status = StatDone;
 428    Dequeue();
 429    return;
 430 }
 431
 432
 433
 434 bool pkgAcqIndexDiffs::QueueNextDiff()
 435 {
 436
 437    // calc sha1 of the just patched file
 438    string FinalFile = _config->FindDir("Dir::State::lists");
 439    FinalFile += URItoFileName(RealURI);
 440
 441    FileFd fd(FinalFile, FileFd::ReadOnly);
 442    SHA1Summation SHA1;
 443    SHA1.AddFD(fd.Fd(), fd.Size());
 444    string local_sha1 = string(SHA1.Result());
 445    if(Debug)
 446       std::clog << "QueueNextDiff: "
 447                 << FinalFile << " (" << local_sha1 << ")"<<std::endl;
 448
 449    // remove all patches until the next matching patch is found
 450    // this requires the Index file to be ordered
 451    for(vector<DiffInfo>::iterator I=available_patches.begin();
 452        available_patches.size() > 0 &&
 453           I != available_patches.end() &&
 454           (*I).sha1 != local_sha1;
 455        I++)
 456    {
 457       available_patches.erase(I);
 458    }
 459
 460    // error checking and falling back if no patch was found
 461    if(available_patches.size() == 0)
 462    {
 463       Failed("", NULL);
 464       return false;
 465    }
 466
 467    // queue the right diff
 468    Desc.URI = string(RealURI) + ".diff/" + available_patches[0].file + ".gz";
 469    Desc.Description = Description + " " + available_patches[0].file + string(".pdiff");
 470
 471    DestFile = _config->FindDir("Dir::State::lists") + "partial/";
 472    DestFile += URItoFileName(RealURI + ".diff/" + available_patches[0].file);
 473
 474    if(Debug)
 475       std::clog << "pkgAcqIndexDiffs::QueueNextDiff(): " << Desc.URI << std::endl;
 476
 477    QueueURI(Desc);
 478
 479    return true;
 480 }
 481
 482
 483
 484 void pkgAcqIndexDiffs::Done(string Message,unsigned long Size,string Md5Hash,
 485                             pkgAcquire::MethodConfig *Cnf)
 486 {
 487    if(Debug)
 488       std::clog << "pkgAcqIndexDiffs::Done(): " << Desc.URI << std::endl;
 489
 490    Item::Done(Message,Size,Md5Hash,Cnf);
 491
 492    string FinalFile;
 493    FinalFile = _config->FindDir("Dir::State::lists")+URItoFileName(RealURI);
 494
 495    // sucess in downloading a diff, enter ApplyDiff state
 496    if(State == StateFetchDiff)
 497    {
 498
 499       if(Debug)
 500          std::clog << "Sending to gzip method: " << FinalFile << std::endl;
 501
 502       string FileName = LookupTag(Message,"Filename");
 503       State = StateUnzipDiff;
 504       Local = true;
 505       Desc.URI = "gzip:" + FileName;
 506       DestFile += ".decomp";
 507       QueueURI(Desc);
 508       Mode = "gzip";
 509       return;
 510    }
 511
 512    // sucess in downloading a diff, enter ApplyDiff state
 513    if(State == StateUnzipDiff)
 514    {
 515
 516       // rred excepts the patch as $FinalFile.ed
 517       Rename(DestFile,FinalFile+".ed");
 518
 519       if(Debug)
 520          std::clog << "Sending to rred method: " << FinalFile << std::endl;
 521
 522       State = StateApplyDiff;
 523       Local = true;
 524       Desc.URI = "rred:" + FinalFile;
 525       QueueURI(Desc);
 526       Mode = "rred";
 527       return;
 528    }
 529
 530
 531    // success in download/apply a diff, queue next (if needed)
 532    if(State == StateApplyDiff)
 533    {
 534       // remove the just applied patch
 535       available_patches.erase(available_patches.begin());
 536
 537       // move into place
 538       if(Debug)
 539       {
 540          std::clog << "Moving patched file in place: " << std::endl
 541                    << DestFile << " -> " << FinalFile << std::endl;
 542       }
 543       Rename(DestFile,FinalFile);
 544       chmod(FinalFile.c_str(),0644);
 545
 546       // see if there is more to download
 547       if(available_patches.size() > 0) {
 548          new pkgAcqIndexDiffs(Owner, RealURI, Description, Desc.ShortDesc,
 549                               ExpectedMD5, available_patches);
 550          return Finish();
 551       } else
 552          return Finish(true);
 553    }
 554 }
 555
 556
 557 // AcqIndex::AcqIndex - Constructor                                     /*{{{*/
 558 // ---------------------------------------------------------------------
 559 /* The package file is added to the queue and a second class is
 560    instantiated to fetch the revision file */
 561 pkgAcqIndex::pkgAcqIndex(pkgAcquire *Owner,
 562                          string URI,string URIDesc,string ShortDesc,
 563                          string ExpectedMD5, string comprExt)
 564    : Item(Owner), RealURI(URI), ExpectedMD5(ExpectedMD5)
 565 {
 566    Decompression = false;
 567    Erase = false;
 568
 569    DestFile = _config->FindDir("Dir::State::lists") + "partial/";
 570    DestFile += URItoFileName(URI);
 571
 572    if(comprExt.empty())
 573    {
 574       // autoselect the compression method
 575       if(FileExists("/bin/bzip2"))
 576          CompressionExtension = ".bz2";
 577       else
 578          CompressionExtension = ".gz";
 579    } else {
 580       CompressionExtension = comprExt;
 581    }
 582    Desc.URI = URI + CompressionExtension;
 583
 584    Desc.Description = URIDesc;
 585    Desc.Owner = this;
 586    Desc.ShortDesc = ShortDesc;
 587
 588    QueueURI(Desc);
 589 }
 590                                                                         /*}}}*/
 591 // AcqIndex::Custom600Headers - Insert custom request headers           /*{{{*/
 592 // ---------------------------------------------------------------------
 593 /* The only header we use is the last-modified header. */
 594 string pkgAcqIndex::Custom600Headers()
 595 {
 596    string Final = _config->FindDir("Dir::State::lists");
 597    Final += URItoFileName(RealURI);
 598
 599    struct stat Buf;
 600    if (stat(Final.c_str(),&Buf) != 0)
 601       return "\nIndex-File: true";
 602
 603    return "\nIndex-File: true\nLast-Modified: " + TimeRFC1123(Buf.st_mtime);
 604 }
 605                                                                         /*}}}*/
 606
 607 void pkgAcqIndex::Failed(string Message,pkgAcquire::MethodConfig *Cnf)
 608 {
 609    // no .bz2 found, retry with .gz
 610    if(Desc.URI.substr(Desc.URI.size()-3) == "bz2") {
 611       Desc.URI = Desc.URI.substr(0,Desc.URI.size()-3) + "gz";
 612
 613       // retry with a gzip one
 614       new pkgAcqIndex(Owner, RealURI, Desc.Description,Desc.ShortDesc,
 615                       ExpectedMD5, string(".gz"));
 616       Status = StatDone;
 617       Complete = false;
 618       Dequeue();
 619       return;
 620    }
 621
 622
 623    Item::Failed(Message,Cnf);
 624 }
 625
 626
 627 // AcqIndex::Done - Finished a fetch                                    /*{{{*/
 628 // ---------------------------------------------------------------------
 629 /* This goes through a number of states.. On the initial fetch the
 630    method could possibly return an alternate filename which points
 631    to the uncompressed version of the file. If this is so the file
 632    is copied into the partial directory. In all other cases the file
 633    is decompressed with a gzip uri. */
 634 void pkgAcqIndex::Done(string Message,unsigned long Size,string MD5,
 635                        pkgAcquire::MethodConfig *Cfg)
 636 {
 637    Item::Done(Message,Size,MD5,Cfg);
 638
 639    if (Decompression == true)
 640    {
 641       if (_config->FindB("Debug::pkgAcquire::Auth", false))
 642       {
 643          std::cerr << std::endl << RealURI << ": Computed MD5: " << MD5;
 644          std::cerr << "  Expected MD5: " << ExpectedMD5 << std::endl;
 645       }
 646
 647       if (MD5.empty())
 648       {
 649          MD5Summation sum;
 650          FileFd Fd(DestFile, FileFd::ReadOnly);
 651          sum.AddFD(Fd.Fd(), Fd.Size());
 652          Fd.Close();
 653          MD5 = (string)sum.Result();
 654       }
 655
 656       if (!ExpectedMD5.empty() && MD5 != ExpectedMD5)
 657       {
 658          Status = StatAuthError;
 659          ErrorText = _("MD5Sum mismatch");
 660          Rename(DestFile,DestFile + ".FAILED");
 661          return;
 662       }
 663       // Done, move it into position
 664       string FinalFile = _config->FindDir("Dir::State::lists");
 665       FinalFile += URItoFileName(RealURI);
 666       Rename(DestFile,FinalFile);
 667       chmod(FinalFile.c_str(),0644);
 668
 669       /* We restore the original name to DestFile so that the clean operation
 670          will work OK */
 671       DestFile = _config->FindDir("Dir::State::lists") + "partial/";
 672       DestFile += URItoFileName(RealURI);
 673
 674       // Remove the compressed version.
 675       if (Erase == true)
 676          unlink(DestFile.c_str());
 677       return;
 678    }
 679
 680    Erase = false;
 681    Complete = true;
 682
 683    // Handle the unzipd case
 684    string FileName = LookupTag(Message,"Alt-Filename");
 685    if (FileName.empty() == false)
 686    {
 687       // The files timestamp matches
 688       if (StringToBool(LookupTag(Message,"Alt-IMS-Hit"),false) == true)
 689          return;
 690
 691       Decompression = true;
 692       Local = true;
 693       DestFile += ".decomp";
 694       Desc.URI = "copy:" + FileName;
 695       QueueURI(Desc);
 696       Mode = "copy";
 697       return;
 698    }
 699
 700    FileName = LookupTag(Message,"Filename");
 701    if (FileName.empty() == true)
 702    {
 703       Status = StatError;
 704       ErrorText = "Method gave a blank filename";
 705    }
 706
 707    // The files timestamp matches
 708    if (StringToBool(LookupTag(Message,"IMS-Hit"),false) == true)
 709       return;
 710
 711    if (FileName == DestFile)
 712       Erase = true;
 713    else
 714       Local = true;
 715
 716    string compExt = Desc.URI.substr(Desc.URI.size()-3);
 717    char *decompProg;
 718    if(compExt == "bz2")
 719       decompProg = "bzip2";
 720    else if(compExt == ".gz")
 721       decompProg = "gzip";
 722    else {
 723       _error->Error("Unsupported extension: %s", compExt.c_str());
 724       return;
 725    }
 726
 727    Decompression = true;
 728    DestFile += ".decomp";
 729    Desc.URI = string(decompProg) + ":" + FileName;
 730    QueueURI(Desc);
 731    Mode = decompProg;
 732 }
 733
 734 // AcqIndexTrans::pkgAcqIndexTrans - Constructor                        /*{{{*/
 735 // ---------------------------------------------------------------------
 736 /* The Translation file is added to the queue */
 737 pkgAcqIndexTrans::pkgAcqIndexTrans(pkgAcquire *Owner,
 738                             string URI,string URIDesc,string ShortDesc) :
 739                       pkgAcqIndex(Owner, URI, URIDesc, ShortDesc, "", "")
 740 {
 741 }
 742
 743                                                                         /*}}}*/
 744 // AcqIndexTrans::Failed - Silence failure messages for missing files   /*{{{*/
 745 // ---------------------------------------------------------------------
 746 /* */
 747 void pkgAcqIndexTrans::Failed(string Message,pkgAcquire::MethodConfig *Cnf)
 748 {
 749    if (Cnf->LocalOnly == true ||
 750        StringToBool(LookupTag(Message,"Transient-Failure"),false) == false)
 751    {
 752       // Ignore this
 753       Status = StatDone;
 754       Complete = false;
 755       Dequeue();
 756       return;
 757    }
 758
 759    Item::Failed(Message,Cnf);
 760 }
 761                                                                         /*}}}*/
 762
 763 pkgAcqMetaSig::pkgAcqMetaSig(pkgAcquire *Owner,
 764                              string URI,string URIDesc,string ShortDesc,
 765                              string MetaIndexURI, string MetaIndexURIDesc,
 766                              string MetaIndexShortDesc,
 767                              const vector<IndexTarget*>* IndexTargets,
 768                              indexRecords* MetaIndexParser) :
 769    Item(Owner), RealURI(URI), MetaIndexURI(MetaIndexURI),
 770    MetaIndexURIDesc(MetaIndexURIDesc), MetaIndexShortDesc(MetaIndexShortDesc),
 771    MetaIndexParser(MetaIndexParser), IndexTargets(IndexTargets)
 772 {
 773    DestFile = _config->FindDir("Dir::State::lists") + "partial/";
 774    DestFile += URItoFileName(URI);
 775
 776    // remove any partial downloaded sig-file. it may confuse proxies
 777    // and is too small to warrant a partial download anyway
 778    unlink(DestFile.c_str());
 779
 780    // Create the item
 781    Desc.Description = URIDesc;
 782    Desc.Owner = this;
 783    Desc.ShortDesc = ShortDesc;
 784    Desc.URI = URI;
 785
 786
 787    string Final = _config->FindDir("Dir::State::lists");
 788    Final += URItoFileName(RealURI);
 789    struct stat Buf;
 790    if (stat(Final.c_str(),&Buf) == 0)
 791    {
 792       // File was already in place.  It needs to be re-verified
 793       // because Release might have changed, so Move it into partial
 794       Rename(Final,DestFile);
 795    }
 796
 797    QueueURI(Desc);
 798 }
 799                                                                         /*}}}*/
 800 // pkgAcqMetaSig::Custom600Headers - Insert custom request headers      /*{{{*/
 801 // ---------------------------------------------------------------------
 802 /* The only header we use is the last-modified header. */
 803 string pkgAcqMetaSig::Custom600Headers()
 804 {
 805    struct stat Buf;
 806    if (stat(DestFile.c_str(),&Buf) != 0)
 807       return "\nIndex-File: true";
 808
 809    return "\nIndex-File: true\nLast-Modified: " + TimeRFC1123(Buf.st_mtime);
 810 }
 811
 812 void pkgAcqMetaSig::Done(string Message,unsigned long Size,string MD5,
 813                          pkgAcquire::MethodConfig *Cfg)
 814 {
 815    Item::Done(Message,Size,MD5,Cfg);
 816
 817    string FileName = LookupTag(Message,"Filename");
 818    if (FileName.empty() == true)
 819    {
 820       Status = StatError;
 821       ErrorText = "Method gave a blank filename";
 822       return;
 823    }
 824
 825    if (FileName != DestFile)
 826    {
 827       // We have to copy it into place
 828       Local = true;
 829       Desc.URI = "copy:" + FileName;
 830       QueueURI(Desc);
 831       return;
 832    }
 833
 834    Complete = true;
 835
 836    // queue a pkgAcqMetaIndex to be verified against the sig we just retrieved
 837    new pkgAcqMetaIndex(Owner, MetaIndexURI, MetaIndexURIDesc, MetaIndexShortDesc,
 838                        DestFile, IndexTargets, MetaIndexParser);
 839
 840 }
 841                                                                         /*}}}*/
 842 void pkgAcqMetaSig::Failed(string Message,pkgAcquire::MethodConfig *Cnf)
 843 {
 844
 845    // if we get a network error we fail gracefully
 846    if(LookupTag(Message,"FailReason") == "Timeout" ||
 847       LookupTag(Message,"FailReason") == "TmpResolveFailure" ||
 848       LookupTag(Message,"FailReason") == "ConnectionRefused") {
 849       Item::Failed(Message,Cnf);
 850       return;
 851    }
 852
 853    // Delete any existing sigfile when the acquire failed
 854    string Final = _config->FindDir("Dir::State::lists") + URItoFileName(RealURI);
 855    unlink(Final.c_str());
 856
 857    // queue a pkgAcqMetaIndex with no sigfile
 858    new pkgAcqMetaIndex(Owner, MetaIndexURI, MetaIndexURIDesc, MetaIndexShortDesc,
 859                        "", IndexTargets, MetaIndexParser);
 860
 861    if (Cnf->LocalOnly == true ||
 862        StringToBool(LookupTag(Message,"Transient-Failure"),false) == false)
 863    {
 864       // Ignore this
 865       Status = StatDone;
 866       Complete = false;
 867       Dequeue();
 868       return;
 869    }
 870
 871    Item::Failed(Message,Cnf);
 872 }
 873
 874 pkgAcqMetaIndex::pkgAcqMetaIndex(pkgAcquire *Owner,
 875                                  string URI,string URIDesc,string ShortDesc,
 876                                  string SigFile,
 877                                  const vector<struct IndexTarget*>* IndexTargets,
 878                                  indexRecords* MetaIndexParser) :
 879    Item(Owner), RealURI(URI), SigFile(SigFile), AuthPass(false),
 880    MetaIndexParser(MetaIndexParser), IndexTargets(IndexTargets), IMSHit(false)
 881 {
 882    DestFile = _config->FindDir("Dir::State::lists") + "partial/";
 883    DestFile += URItoFileName(URI);
 884
 885    // Create the item
 886    Desc.Description = URIDesc;
 887    Desc.Owner = this;
 888    Desc.ShortDesc = ShortDesc;
 889    Desc.URI = URI;
 890
 891    QueueURI(Desc);
 892 }
 893
 894                                                                         /*}}}*/
 895 // pkgAcqMetaIndex::Custom600Headers - Insert custom request headers    /*{{{*/
 896 // ---------------------------------------------------------------------
 897 /* The only header we use is the last-modified header. */
 898 string pkgAcqMetaIndex::Custom600Headers()
 899 {
 900    string Final = _config->FindDir("Dir::State::lists");
 901    Final += URItoFileName(RealURI);
 902
 903    struct stat Buf;
 904    if (stat(Final.c_str(),&Buf) != 0)
 905       return "\nIndex-File: true";
 906
 907    return "\nIndex-File: true\nLast-Modified: " + TimeRFC1123(Buf.st_mtime);
 908 }
 909
 910 void pkgAcqMetaIndex::Done(string Message,unsigned long Size,string MD5,
 911                            pkgAcquire::MethodConfig *Cfg)
 912 {
 913    Item::Done(Message,Size,MD5,Cfg);
 914
 915    // MetaIndexes are done in two passes: one to download the
 916    // metaindex with an appropriate method, and a second to verify it
 917    // with the gpgv method
 918
 919    if (AuthPass == true)
 920    {
 921       AuthDone(Message);
 922    }
 923    else
 924    {
 925       RetrievalDone(Message);
 926       if (!Complete)
 927          // Still more retrieving to do
 928          return;
 929
 930       if (SigFile == "")
 931       {
 932          // There was no signature file, so we are finished.  Download
 933          // the indexes without verification.
 934          QueueIndexes(false);
 935       }
 936       else
 937       {
 938          // There was a signature file, so pass it to gpgv for
 939          // verification
 940
 941          if (_config->FindB("Debug::pkgAcquire::Auth", false))
 942             std::cerr << "Metaindex acquired, queueing gpg verification ("
 943                       << SigFile << "," << DestFile << ")\n";
 944          AuthPass = true;
 945          Desc.URI = "gpgv:" + SigFile;
 946          QueueURI(Desc);
 947          Mode = "gpgv";
 948       }
 949    }
 950 }
 951
 952 void pkgAcqMetaIndex::RetrievalDone(string Message)
 953 {
 954    // We have just finished downloading a Release file (it is not
 955    // verified yet)
 956
 957    string FileName = LookupTag(Message,"Filename");
 958    if (FileName.empty() == true)
 959    {
 960       Status = StatError;
 961       ErrorText = "Method gave a blank filename";
 962       return;
 963    }
 964
 965    if (FileName != DestFile)
 966    {
 967       Local = true;
 968       Desc.URI = "copy:" + FileName;
 969       QueueURI(Desc);
 970       return;
 971    }
 972
 973    // see if the download was a IMSHit
 974    IMSHit = StringToBool(LookupTag(Message,"IMS-Hit"),false);
 975
 976    Complete = true;
 977
 978    string FinalFile = _config->FindDir("Dir::State::lists");
 979    FinalFile += URItoFileName(RealURI);
 980
 981    // The files timestamp matches
 982    if (StringToBool(LookupTag(Message,"IMS-Hit"),false) == false)
 983    {
 984       // Move it into position
 985       Rename(DestFile,FinalFile);
 986    }
 987    chmod(FinalFile.c_str(),0644);
 988    DestFile = FinalFile;
 989 }
 990
 991 void pkgAcqMetaIndex::AuthDone(string Message)
 992 {
 993    // At this point, the gpgv method has succeeded, so there is a
 994    // valid signature from a key in the trusted keyring.  We
 995    // perform additional verification of its contents, and use them
 996    // to verify the indexes we are about to download
 997
 998    if (!MetaIndexParser->Load(DestFile))
 999    {
1000       Status = StatAuthError;
1001       ErrorText = MetaIndexParser->ErrorText;
1002       return;
1003    }
1004
1005    if (!VerifyVendor(Message))
1006    {
1007       return;
1008    }
1009
1010    if (_config->FindB("Debug::pkgAcquire::Auth", false))
1011       std::cerr << "Signature verification succeeded: "
1012                 << DestFile << std::endl;
1013
1014    // Download further indexes with verification
1015    QueueIndexes(true);
1016
1017    // Done, move signature file into position
1018
1019    string VerifiedSigFile = _config->FindDir("Dir::State::lists") +
1020       URItoFileName(RealURI) + ".gpg";
1021    Rename(SigFile,VerifiedSigFile);
1022    chmod(VerifiedSigFile.c_str(),0644);
1023 }
1024
1025 void pkgAcqMetaIndex::QueueIndexes(bool verify)
1026 {
1027    for (vector <struct IndexTarget*>::const_iterator Target = IndexTargets->begin();
1028         Target != IndexTargets->end();
1029         Target++)
1030    {
1031       string ExpectedIndexMD5;
1032       if (verify)
1033       {
1034          const indexRecords::checkSum *Record = MetaIndexParser->Lookup((*Target)->MetaKey);
1035          if (!Record)
1036          {
1037             Status = StatAuthError;
1038             ErrorText = "Unable to find expected entry  "
1039                + (*Target)->MetaKey + " in Meta-index file (malformed Release file?)";
1040             return;
1041          }
1042          ExpectedIndexMD5 = Record->MD5Hash;
1043          if (_config->FindB("Debug::pkgAcquire::Auth", false))
1044          {
1045             std::cerr << "Queueing: " << (*Target)->URI << std::endl;
1046             std::cerr << "Expected MD5: " << ExpectedIndexMD5 << std::endl;
1047          }
1048          if (ExpectedIndexMD5.empty())
1049          {
1050             Status = StatAuthError;
1051             ErrorText = "Unable to find MD5 sum for "
1052                + (*Target)->MetaKey + " in Meta-index file";
1053             return;
1054          }
1055       }
1056
1057       // Queue Packages file (either diff or full packages files, depending
1058       // on the users option)
1059       if(_config->FindB("Acquire::PDiffs",true) == true)
1060          new pkgAcqDiffIndex(Owner, (*Target)->URI, (*Target)->Description,
1061                              (*Target)->ShortDesc, ExpectedIndexMD5);
1062       else
1063          new pkgAcqIndex(Owner, (*Target)->URI, (*Target)->Description,
1064                             (*Target)->ShortDesc, ExpectedIndexMD5);
1065    }
1066 }
1067
1068 bool pkgAcqMetaIndex::VerifyVendor(string Message)
1069 {
1070 //    // Maybe this should be made available from above so we don't have
1071 //    // to read and parse it every time?
1072 //    pkgVendorList List;
1073 //    List.ReadMainList();
1074
1075 //    const Vendor* Vndr = NULL;
1076 //    for (std::vector<string>::const_iterator I = GPGVOutput.begin(); I != GPGVOutput.end(); I++)
1077 //    {
1078 //       string::size_type pos = (*I).find("VALIDSIG ");
1079 //       if (_config->FindB("Debug::Vendor", false))
1080 //          std::cerr << "Looking for VALIDSIG in \"" << (*I) << "\": pos " << pos
1081 //                    << std::endl;
1082 //       if (pos != std::string::npos)
1083 //       {
1084 //          string Fingerprint = (*I).substr(pos+sizeof("VALIDSIG"));
1085 //          if (_config->FindB("Debug::Vendor", false))
1086 //             std::cerr << "Looking for \"" << Fingerprint << "\" in vendor..." <<
1087 //                std::endl;
1088 //          Vndr = List.FindVendor(Fingerprint) != "";
1089 //          if (Vndr != NULL);
1090 //          break;
1091 //       }
1092 //    }
1093    string::size_type pos;
1094
1095    // check for missing sigs (that where not fatal because otherwise we had
1096    // bombed earlier)
1097    string missingkeys;
1098    string msg = _("There is no public key available for the "
1099                   "following key IDs:\n");
1100    pos = Message.find("NO_PUBKEY ");
1101    if (pos != std::string::npos)
1102    {
1103       string::size_type start = pos+strlen("NO_PUBKEY ");
1104       string Fingerprint = Message.substr(start, Message.find("\n")-start);
1105       missingkeys += (Fingerprint);
1106    }
1107    if(!missingkeys.empty())
1108       _error->Warning("%s", string(msg+missingkeys).c_str());
1109
1110    string Transformed = MetaIndexParser->GetExpectedDist();
1111
1112    if (Transformed == "../project/experimental")
1113    {
1114       Transformed = "experimental";
1115    }
1116
1117    pos = Transformed.rfind('/');
1118    if (pos != string::npos)
1119    {
1120       Transformed = Transformed.substr(0, pos);
1121    }
1122
1123    if (Transformed == ".")
1124    {
1125       Transformed = "";
1126    }
1127
1128    if (_config->FindB("Debug::pkgAcquire::Auth", false))
1129    {
1130       std::cerr << "Got Codename: " << MetaIndexParser->GetDist() << std::endl;
1131       std::cerr << "Expecting Dist: " << MetaIndexParser->GetExpectedDist() << std::endl;
1132       std::cerr << "Transformed Dist: " << Transformed << std::endl;
1133    }
1134
1135    if (MetaIndexParser->CheckDist(Transformed) == false)
1136    {
1137       // This might become fatal one day
1138 //       Status = StatAuthError;
1139 //       ErrorText = "Conflicting distribution; expected "
1140 //          + MetaIndexParser->GetExpectedDist() + " but got "
1141 //          + MetaIndexParser->GetDist();
1142 //       return false;
1143       if (!Transformed.empty())
1144       {
1145          _error->Warning("Conflicting distribution: %s (expected %s but got %s)",
1146                          Desc.Description.c_str(),
1147                          Transformed.c_str(),
1148                          MetaIndexParser->GetDist().c_str());
1149       }
1150    }
1151
1152    return true;
1153 }
1154                                                                 /*}}}*/
1155 // pkgAcqMetaIndex::Failed - no Release file present or no signature
1156 //      file present                                            /*{{{*/
1157 // ---------------------------------------------------------------------
1158 /* */
1159 void pkgAcqMetaIndex::Failed(string Message,pkgAcquire::MethodConfig *Cnf)
1160 {
1161    if (AuthPass == true)
1162    {
1163       // if we fail the authentication but got the file via a IMS-Hit
1164       // this means that the file wasn't downloaded and that it might be
1165       // just stale (server problem, proxy etc). we delete what we have
1166       // queue it again without i-m-s
1167       // alternatively we could just unlink the file and let the user try again
1168       if (IMSHit)
1169       {
1170          Complete = false;
1171          Local = false;
1172          AuthPass = false;
1173          unlink(DestFile.c_str());
1174
1175          DestFile = _config->FindDir("Dir::State::lists") + "partial/";
1176          DestFile += URItoFileName(RealURI);
1177          Desc.URI = RealURI;
1178          QueueURI(Desc);
1179          return;
1180       }
1181
1182       // gpgv method failed
1183       _error->Warning("GPG error: %s: %s",
1184                       Desc.Description.c_str(),
1185                       LookupTag(Message,"Message").c_str());
1186
1187    }
1188
1189    // No Release file was present, or verification failed, so fall
1190    // back to queueing Packages files without verification
1191    QueueIndexes(false);
1192 }
1193
1194                                                                         /*}}}*/
1195
1196 // AcqArchive::AcqArchive - Constructor                                 /*{{{*/
1197 // ---------------------------------------------------------------------
1198 /* This just sets up the initial fetch environment and queues the first
1199    possibilitiy */
1200 pkgAcqArchive::pkgAcqArchive(pkgAcquire *Owner,pkgSourceList *Sources,
1201                              pkgRecords *Recs,pkgCache::VerIterator const &Version,
1202                              string &StoreFilename) :
1203                Item(Owner), Version(Version), Sources(Sources), Recs(Recs),
1204                StoreFilename(StoreFilename), Vf(Version.FileList()),
1205                Trusted(false)
1206 {
1207    Retries = _config->FindI("Acquire::Retries",0);
1208
1209    if (Version.Arch() == 0)
1210    {
1211       _error->Error(_("I wasn't able to locate a file for the %s package. "
1212                       "This might mean you need to manually fix this package. "
1213                       "(due to missing arch)"),
1214                     Version.ParentPkg().Name());
1215       return;
1216    }
1217
1218    /* We need to find a filename to determine the extension. We make the
1219       assumption here that all the available sources for this version share
1220       the same extension.. */
1221    // Skip not source sources, they do not have file fields.
1222    for (; Vf.end() == false; Vf++)
1223    {
1224       if ((Vf.File()->Flags & pkgCache::Flag::NotSource) != 0)
1225          continue;
1226       break;
1227    }
1228
1229    // Does not really matter here.. we are going to fail out below
1230    if (Vf.end() != true)
1231    {
1232       // If this fails to get a file name we will bomb out below.
1233       pkgRecords::Parser &Parse = Recs->Lookup(Vf);
1234       if (_error->PendingError() == true)
1235          return;
1236
1237       // Generate the final file name as: package_version_arch.foo
1238       StoreFilename = QuoteString(Version.ParentPkg().Name(),"_:") + '_' +
1239                       QuoteString(Version.VerStr(),"_:") + '_' +
1240                       QuoteString(Version.Arch(),"_:.") +
1241                       "." + flExtension(Parse.FileName());
1242    }
1243
1244    // check if we have one trusted source for the package. if so, switch
1245    // to "TrustedOnly" mode
1246    for (pkgCache::VerFileIterator i = Version.FileList(); i.end() == false; i++)
1247    {
1248       pkgIndexFile *Index;
1249       if (Sources->FindIndex(i.File(),Index) == false)
1250          continue;
1251       if (_config->FindB("Debug::pkgAcquire::Auth", false))
1252       {
1253          std::cerr << "Checking index: " << Index->Describe()
1254                    << "(Trusted=" << Index->IsTrusted() << ")\n";
1255       }
1256       if (Index->IsTrusted()) {
1257          Trusted = true;
1258          break;
1259       }
1260    }
1261
1262    // "allow-unauthenticated" restores apts old fetching behaviour
1263    // that means that e.g. unauthenticated file:// uris are higher
1264    // priority than authenticated http:// uris
1265    if (_config->FindB("APT::Get::AllowUnauthenticated",false) == true)
1266       Trusted = false;
1267
1268    // Select a source
1269    if (QueueNext() == false && _error->PendingError() == false)
1270       _error->Error(_("I wasn't able to locate file for the %s package. "
1271                     "This might mean you need to manually fix this package."),
1272                     Version.ParentPkg().Name());
1273 }
1274                                                                         /*}}}*/
1275 // AcqArchive::QueueNext - Queue the next file source                   /*{{{*/
1276 // ---------------------------------------------------------------------
1277 /* This queues the next available file version for download. It checks if
1278    the archive is already available in the cache and stashs the MD5 for
1279    checking later. */
1280 bool pkgAcqArchive::QueueNext()
1281 {
1282    for (; Vf.end() == false; Vf++)
1283    {
1284       // Ignore not source sources
1285       if ((Vf.File()->Flags & pkgCache::Flag::NotSource) != 0)
1286          continue;
1287
1288       // Try to cross match against the source list
1289       pkgIndexFile *Index;
1290       if (Sources->FindIndex(Vf.File(),Index) == false)
1291             continue;
1292
1293       // only try to get a trusted package from another source if that source
1294       // is also trusted
1295       if(Trusted && !Index->IsTrusted())
1296          continue;
1297
1298       // Grab the text package record
1299       pkgRecords::Parser &Parse = Recs->Lookup(Vf);
1300       if (_error->PendingError() == true)
1301          return false;
1302
1303       string PkgFile = Parse.FileName();
1304       MD5 = Parse.MD5Hash();
1305       if (PkgFile.empty() == true)
1306          return _error->Error(_("The package index files are corrupted. No Filename: "
1307                               "field for package %s."),
1308                               Version.ParentPkg().Name());
1309
1310       Desc.URI = Index->ArchiveURI(PkgFile);
1311       Desc.Description = Index->ArchiveInfo(Version);
1312       Desc.Owner = this;
1313       Desc.ShortDesc = Version.ParentPkg().Name();
1314
1315       // See if we already have the file. (Legacy filenames)
1316       FileSize = Version->Size;
1317       string FinalFile = _config->FindDir("Dir::Cache::Archives") + flNotDir(PkgFile);
1318       struct stat Buf;
1319       if (stat(FinalFile.c_str(),&Buf) == 0)
1320       {
1321          // Make sure the size matches
1322          if ((unsigned)Buf.st_size == Version->Size)
1323          {
1324             Complete = true;
1325             Local = true;
1326             Status = StatDone;
1327             StoreFilename = DestFile = FinalFile;
1328             return true;
1329          }
1330
1331          /* Hmm, we have a file and its size does not match, this means it is
1332             an old style mismatched arch */
1333          unlink(FinalFile.c_str());
1334       }
1335
1336       // Check it again using the new style output filenames
1337       FinalFile = _config->FindDir("Dir::Cache::Archives") + flNotDir(StoreFilename);
1338       if (stat(FinalFile.c_str(),&Buf) == 0)
1339       {
1340          // Make sure the size matches
1341          if ((unsigned)Buf.st_size == Version->Size)
1342          {
1343             Complete = true;
1344             Local = true;
1345             Status = StatDone;
1346             StoreFilename = DestFile = FinalFile;
1347             return true;
1348          }
1349
1350          /* Hmm, we have a file and its size does not match, this shouldnt
1351             happen.. */
1352          unlink(FinalFile.c_str());
1353       }
1354
1355       DestFile = _config->FindDir("Dir::Cache::Archives") + "partial/" + flNotDir(StoreFilename);
1356
1357       // Check the destination file
1358       if (stat(DestFile.c_str(),&Buf) == 0)
1359       {
1360          // Hmm, the partial file is too big, erase it
1361          if ((unsigned)Buf.st_size > Version->Size)
1362             unlink(DestFile.c_str());
1363          else
1364             PartialSize = Buf.st_size;
1365       }
1366
1367       // Create the item
1368       Local = false;
1369       Desc.URI = Index->ArchiveURI(PkgFile);
1370       Desc.Description = Index->ArchiveInfo(Version);
1371       Desc.Owner = this;
1372       Desc.ShortDesc = Version.ParentPkg().Name();
1373       QueueURI(Desc);
1374
1375       Vf++;
1376       return true;
1377    }
1378    return false;
1379 }
1380                                                                         /*}}}*/
1381 // AcqArchive::Done - Finished fetching                                 /*{{{*/
1382 // ---------------------------------------------------------------------
1383 /* */
1384 void pkgAcqArchive::Done(string Message,unsigned long Size,string Md5Hash,
1385                          pkgAcquire::MethodConfig *Cfg)
1386 {
1387    Item::Done(Message,Size,Md5Hash,Cfg);
1388
1389    // Check the size
1390    if (Size != Version->Size)
1391    {
1392       Status = StatError;
1393       ErrorText = _("Size mismatch");
1394       return;
1395    }
1396
1397    // Check the md5
1398    if (Md5Hash.empty() == false && MD5.empty() == false)
1399    {
1400       if (Md5Hash != MD5)
1401       {
1402          Status = StatError;
1403          ErrorText = _("MD5Sum mismatch");
1404          if(FileExists(DestFile))
1405             Rename(DestFile,DestFile + ".FAILED");
1406          return;
1407       }
1408    }
1409
1410    // Grab the output filename
1411    string FileName = LookupTag(Message,"Filename");
1412    if (FileName.empty() == true)
1413    {
1414       Status = StatError;
1415       ErrorText = "Method gave a blank filename";
1416       return;
1417    }
1418
1419    Complete = true;
1420
1421    // Reference filename
1422    if (FileName != DestFile)
1423    {
1424       StoreFilename = DestFile = FileName;
1425       Local = true;
1426       return;
1427    }
1428
1429    // Done, move it into position
1430    string FinalFile = _config->FindDir("Dir::Cache::Archives");
1431    FinalFile += flNotDir(StoreFilename);
1432    Rename(DestFile,FinalFile);
1433
1434    StoreFilename = DestFile = FinalFile;
1435    Complete = true;
1436 }
1437                                                                         /*}}}*/
1438 // AcqArchive::Failed - Failure handler                                 /*{{{*/
1439 // ---------------------------------------------------------------------
1440 /* Here we try other sources */
1441 void pkgAcqArchive::Failed(string Message,pkgAcquire::MethodConfig *Cnf)
1442 {
1443    ErrorText = LookupTag(Message,"Message");
1444
1445    /* We don't really want to retry on failed media swaps, this prevents
1446       that. An interesting observation is that permanent failures are not
1447       recorded. */
1448    if (Cnf->Removable == true &&
1449        StringToBool(LookupTag(Message,"Transient-Failure"),false) == true)
1450    {
1451       // Vf = Version.FileList();
1452       while (Vf.end() == false) Vf++;
1453       StoreFilename = string();
1454       Item::Failed(Message,Cnf);
1455       return;
1456    }
1457
1458    if (QueueNext() == false)
1459    {
1460       // This is the retry counter
1461       if (Retries != 0 &&
1462           Cnf->LocalOnly == false &&
1463           StringToBool(LookupTag(Message,"Transient-Failure"),false) == true)
1464       {
1465          Retries--;
1466          Vf = Version.FileList();
1467          if (QueueNext() == true)
1468             return;
1469       }
1470
1471       StoreFilename = string();
1472       Item::Failed(Message,Cnf);
1473    }
1474 }
1475                                                                         /*}}}*/
1476 // AcqArchive::IsTrusted - Determine whether this archive comes from a
1477 // trusted source                                                       /*{{{*/
1478 // ---------------------------------------------------------------------
1479 bool pkgAcqArchive::IsTrusted()
1480 {
1481    return Trusted;
1482 }
1483
1484 // AcqArchive::Finished - Fetching has finished, tidy up                /*{{{*/
1485 // ---------------------------------------------------------------------
1486 /* */
1487 void pkgAcqArchive::Finished()
1488 {
1489    if (Status == pkgAcquire::Item::StatDone &&
1490        Complete == true)
1491       return;
1492    StoreFilename = string();
1493 }
1494                                                                         /*}}}*/
1495
1496 // AcqFile::pkgAcqFile - Constructor                                    /*{{{*/
1497 // ---------------------------------------------------------------------
1498 /* The file is added to the queue */
1499 pkgAcqFile::pkgAcqFile(pkgAcquire *Owner,string URI,string MD5,
1500                        unsigned long Size,string Dsc,string ShortDesc,
1501                        const string &DestDir, const string &DestFilename) :
1502                        Item(Owner), Md5Hash(MD5)
1503 {
1504    Retries = _config->FindI("Acquire::Retries",0);
1505
1506    if(!DestFilename.empty())
1507       DestFile = DestFilename;
1508    else if(!DestDir.empty())
1509       DestFile = DestDir + "/" + flNotDir(URI);
1510    else
1511       DestFile = flNotDir(URI);
1512
1513    // Create the item
1514    Desc.URI = URI;
1515    Desc.Description = Dsc;
1516    Desc.Owner = this;
1517
1518    // Set the short description to the archive component
1519    Desc.ShortDesc = ShortDesc;
1520
1521    // Get the transfer sizes
1522    FileSize = Size;
1523    struct stat Buf;
1524    if (stat(DestFile.c_str(),&Buf) == 0)
1525    {
1526       // Hmm, the partial file is too big, erase it
1527       if ((unsigned)Buf.st_size > Size)
1528          unlink(DestFile.c_str());
1529       else
1530          PartialSize = Buf.st_size;
1531    }
1532
1533    QueueURI(Desc);
1534 }
1535                                                                         /*}}}*/
1536 // AcqFile::Done - Item downloaded OK                                   /*{{{*/
1537 // ---------------------------------------------------------------------
1538 /* */
1539 void pkgAcqFile::Done(string Message,unsigned long Size,string MD5,
1540                       pkgAcquire::MethodConfig *Cnf)
1541 {
1542    // Check the md5
1543    if (Md5Hash.empty() == false && MD5.empty() == false)
1544    {
1545       if (Md5Hash != MD5)
1546       {
1547          Status = StatError;
1548          ErrorText = "MD5Sum mismatch";
1549          Rename(DestFile,DestFile + ".FAILED");
1550          return;
1551       }
1552    }
1553
1554    Item::Done(Message,Size,MD5,Cnf);
1555
1556    string FileName = LookupTag(Message,"Filename");
1557    if (FileName.empty() == true)
1558    {
1559       Status = StatError;
1560       ErrorText = "Method gave a blank filename";
1561       return;
1562    }
1563
1564    Complete = true;
1565
1566    // The files timestamp matches
1567    if (StringToBool(LookupTag(Message,"IMS-Hit"),false) == true)
1568       return;
1569
1570    // We have to copy it into place
1571    if (FileName != DestFile)
1572    {
1573       Local = true;
1574       if (_config->FindB("Acquire::Source-Symlinks",true) == false ||
1575           Cnf->Removable == true)
1576       {
1577          Desc.URI = "copy:" + FileName;
1578          QueueURI(Desc);
1579          return;
1580       }
1581
1582       // Erase the file if it is a symlink so we can overwrite it
1583       struct stat St;
1584       if (lstat(DestFile.c_str(),&St) == 0)
1585       {
1586          if (S_ISLNK(St.st_mode) != 0)
1587             unlink(DestFile.c_str());
1588       }
1589
1590       // Symlink the file
1591       if (symlink(FileName.c_str(),DestFile.c_str()) != 0)
1592       {
1593          ErrorText = "Link to " + DestFile + " failure ";
1594          Status = StatError;
1595          Complete = false;
1596       }
1597    }
1598 }
1599                                                                         /*}}}*/
1600 // AcqFile::Failed - Failure handler                                    /*{{{*/
1601 // ---------------------------------------------------------------------
1602 /* Here we try other sources */
1603 void pkgAcqFile::Failed(string Message,pkgAcquire::MethodConfig *Cnf)
1604 {
1605    ErrorText = LookupTag(Message,"Message");
1606
1607    // This is the retry counter
1608    if (Retries != 0 &&
1609        Cnf->LocalOnly == false &&
1610        StringToBool(LookupTag(Message,"Transient-Failure"),false) == true)
1611    {
1612       Retries--;
1613       QueueURI(Desc);
1614       return;
1615    }
1616
1617    Item::Failed(Message,Cnf);
1618 }
1619                                                                         /*}}}*/