apt-pkg/acquire.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: acquire.cc,v 1.30 1999/03/16 07:28:45 jgg Exp $
   4 /* ######################################################################
   5
   6    Acquire - File Acquiration
   7
   8    The core element for the schedual system is the concept of a named
   9    queue. Each queue is unique and each queue has a name derived from the
  10    URI. The degree of paralization can be controled by how the queue
  11    name is derived from the URI.
  12
  13    ##################################################################### */
  14                                                                         /*}}}*/
  15 // Include Files                                                        /*{{{*/
  16 #ifdef __GNUG__
  17 #pragma implementation "apt-pkg/acquire.h"
  18 #endif
  19 #include <apt-pkg/acquire.h>
  20 #include <apt-pkg/acquire-item.h>
  21 #include <apt-pkg/acquire-worker.h>
  22 #include <apt-pkg/configuration.h>
  23 #include <apt-pkg/error.h>
  24 #include <apt-pkg/strutl.h>
  25
  26 #include <dirent.h>
  27 #include <sys/time.h>
  28 #include <errno.h>
  29                                                                         /*}}}*/
  30
  31 // Acquire::pkgAcquire - Constructor                                    /*{{{*/
  32 // ---------------------------------------------------------------------
  33 /* We grab some runtime state from the configuration space */
  34 pkgAcquire::pkgAcquire(pkgAcquireStatus *Log) : Log(Log)
  35 {
  36    Queues = 0;
  37    Configs = 0;
  38    Workers = 0;
  39    ToFetch = 0;
  40    Running = false;
  41
  42    string Mode = _config->Find("Acquire::Queue-Mode","host");
  43    if (strcasecmp(Mode.c_str(),"host") == 0)
  44       QueueMode = QueueHost;
  45    if (strcasecmp(Mode.c_str(),"access") == 0)
  46       QueueMode = QueueAccess;
  47
  48    Debug = _config->FindB("Debug::pkgAcquire",false);
  49 }
  50                                                                         /*}}}*/
  51 // Acquire::~pkgAcquire - Destructor                                    /*{{{*/
  52 // ---------------------------------------------------------------------
  53 /* Free our memory, clean up the queues (destroy the workers) */
  54 pkgAcquire::~pkgAcquire()
  55 {
  56    while (Items.size() != 0)
  57       delete Items[0];
  58
  59    while (Configs != 0)
  60    {
  61       MethodConfig *Jnk = Configs;
  62       Configs = Configs->Next;
  63       delete Jnk;
  64    }
  65
  66    while (Queues != 0)
  67    {
  68       Queue *Jnk = Queues;
  69       Queues = Queues->Next;
  70       delete Jnk;
  71    }
  72 }
  73                                                                         /*}}}*/
  74 // Acquire::Add - Add a new item                                        /*{{{*/
  75 // ---------------------------------------------------------------------
  76 /* This puts an item on the acquire list. This list is mainly for tracking
  77    item status */
  78 void pkgAcquire::Add(Item *Itm)
  79 {
  80    Items.push_back(Itm);
  81 }
  82                                                                         /*}}}*/
  83 // Acquire::Remove - Remove a item                                      /*{{{*/
  84 // ---------------------------------------------------------------------
  85 /* Remove an item from the acquire list. This is usually not used.. */
  86 void pkgAcquire::Remove(Item *Itm)
  87 {
  88    for (vector<Item *>::iterator I = Items.begin(); I < Items.end(); I++)
  89    {
  90       if (*I == Itm)
  91          Items.erase(I);
  92    }
  93 }
  94                                                                         /*}}}*/
  95 // Acquire::Add - Add a worker                                          /*{{{*/
  96 // ---------------------------------------------------------------------
  97 /* A list of workers is kept so that the select loop can direct their FD
  98    usage. */
  99 void pkgAcquire::Add(Worker *Work)
 100 {
 101    Work->NextAcquire = Workers;
 102    Workers = Work;
 103 }
 104                                                                         /*}}}*/
 105 // Acquire::Remove - Remove a worker                                    /*{{{*/
 106 // ---------------------------------------------------------------------
 107 /* A worker has died. This can not be done while the select loop is running
 108    as it would require that RunFds could handling a changing list state and
 109    it cant.. */
 110 void pkgAcquire::Remove(Worker *Work)
 111 {
 112    if (Running == true)
 113       abort();
 114
 115    Worker **I = &Workers;
 116    for (; *I != 0;)
 117    {
 118       if (*I == Work)
 119          *I = (*I)->NextAcquire;
 120       else
 121          I = &(*I)->NextAcquire;
 122    }
 123 }
 124                                                                         /*}}}*/
 125 // Acquire::Enqueue - Queue an URI for fetching                         /*{{{*/
 126 // ---------------------------------------------------------------------
 127 /* This is the entry point for an item. An item calls this function when
 128    it is construction which creates a queue (based on the current queue
 129    mode) and puts the item in that queue. If the system is running then
 130    the queue might be started. */
 131 void pkgAcquire::Enqueue(ItemDesc &Item)
 132 {
 133    // Determine which queue to put the item in
 134    const MethodConfig *Config;
 135    string Name = QueueName(Item.URI,Config);
 136    if (Name.empty() == true)
 137       return;
 138
 139    // Find the queue structure
 140    Queue *I = Queues;
 141    for (; I != 0 && I->Name != Name; I = I->Next);
 142    if (I == 0)
 143    {
 144       I = new Queue(Name,this);
 145       I->Next = Queues;
 146       Queues = I;
 147
 148       if (Running == true)
 149          I->Startup();
 150    }
 151
 152    // See if this is a local only URI
 153    if (Config->LocalOnly == true && Item.Owner->Complete == false)
 154       Item.Owner->Local = true;
 155    Item.Owner->Status = Item::StatIdle;
 156
 157    // Queue it into the named queue
 158    I->Enqueue(Item);
 159    ToFetch++;
 160
 161    // Some trace stuff
 162    if (Debug == true)
 163    {
 164       clog << "Fetching " << Item.URI << endl;
 165       clog << " to " << Item.Owner->DestFile << endl;
 166       clog << " Queue is: " << Name << endl;
 167    }
 168 }
 169                                                                         /*}}}*/
 170 // Acquire::Dequeue - Remove an item from all queues                    /*{{{*/
 171 // ---------------------------------------------------------------------
 172 /* This is called when an item is finished being fetched. It removes it
 173    from all the queues */
 174 void pkgAcquire::Dequeue(Item *Itm)
 175 {
 176    Queue *I = Queues;
 177    bool Res = false;
 178    for (; I != 0; I = I->Next)
 179       Res |= I->Dequeue(Itm);
 180
 181    if (Debug == true)
 182       clog << "Dequeuing " << Itm->DestFile << endl;
 183    if (Res == true)
 184       ToFetch--;
 185 }
 186                                                                         /*}}}*/
 187 // Acquire::QueueName - Return the name of the queue for this URI       /*{{{*/
 188 // ---------------------------------------------------------------------
 189 /* The string returned depends on the configuration settings and the
 190    method parameters. Given something like http://foo.org/bar it can
 191    return http://foo.org or http */
 192 string pkgAcquire::QueueName(string Uri,MethodConfig const *&Config)
 193 {
 194    URI U(Uri);
 195
 196    Config = GetConfig(U.Access);
 197    if (Config == 0)
 198       return string();
 199
 200    /* Single-Instance methods get exactly one queue per URI. This is
 201       also used for the Access queue method  */
 202    if (Config->SingleInstance == true || QueueMode == QueueAccess)
 203        return U.Access;
 204
 205    return U.Access + ':' + U.Host;
 206 }
 207                                                                         /*}}}*/
 208 // Acquire::GetConfig - Fetch the configuration information             /*{{{*/
 209 // ---------------------------------------------------------------------
 210 /* This locates the configuration structure for an access method. If
 211    a config structure cannot be found a Worker will be created to
 212    retrieve it */
 213 pkgAcquire::MethodConfig *pkgAcquire::GetConfig(string Access)
 214 {
 215    // Search for an existing config
 216    MethodConfig *Conf;
 217    for (Conf = Configs; Conf != 0; Conf = Conf->Next)
 218       if (Conf->Access == Access)
 219          return Conf;
 220
 221    // Create the new config class
 222    Conf = new MethodConfig;
 223    Conf->Access = Access;
 224    Conf->Next = Configs;
 225    Configs = Conf;
 226
 227    // Create the worker to fetch the configuration
 228    Worker Work(Conf);
 229    if (Work.Start() == false)
 230       return 0;
 231
 232    return Conf;
 233 }
 234                                                                         /*}}}*/
 235 // Acquire::SetFds - Deal with readable FDs                             /*{{{*/
 236 // ---------------------------------------------------------------------
 237 /* Collect FDs that have activity monitors into the fd sets */
 238 void pkgAcquire::SetFds(int &Fd,fd_set *RSet,fd_set *WSet)
 239 {
 240    for (Worker *I = Workers; I != 0; I = I->NextAcquire)
 241    {
 242       if (I->InReady == true && I->InFd >= 0)
 243       {
 244          if (Fd < I->InFd)
 245             Fd = I->InFd;
 246          FD_SET(I->InFd,RSet);
 247       }
 248       if (I->OutReady == true && I->OutFd >= 0)
 249       {
 250          if (Fd < I->OutFd)
 251             Fd = I->OutFd;
 252          FD_SET(I->OutFd,WSet);
 253       }
 254    }
 255 }
 256                                                                         /*}}}*/
 257 // Acquire::RunFds - Deal with active FDs                               /*{{{*/
 258 // ---------------------------------------------------------------------
 259 /* Dispatch active FDs over to the proper workers. It is very important
 260    that a worker never be erased while this is running! The queue class
 261    should never erase a worker except during shutdown processing. */
 262 void pkgAcquire::RunFds(fd_set *RSet,fd_set *WSet)
 263 {
 264    for (Worker *I = Workers; I != 0; I = I->NextAcquire)
 265    {
 266       if (I->InFd >= 0 && FD_ISSET(I->InFd,RSet) != 0)
 267          I->InFdReady();
 268       if (I->OutFd >= 0 && FD_ISSET(I->OutFd,WSet) != 0)
 269          I->OutFdReady();
 270    }
 271 }
 272                                                                         /*}}}*/
 273 // Acquire::Run - Run the fetch sequence                                /*{{{*/
 274 // ---------------------------------------------------------------------
 275 /* This runs the queues. It manages a select loop for all of the
 276    Worker tasks. The workers interact with the queues and items to
 277    manage the actual fetch. */
 278 bool pkgAcquire::Run()
 279 {
 280    Running = true;
 281
 282    for (Queue *I = Queues; I != 0; I = I->Next)
 283       I->Startup();
 284
 285    if (Log != 0)
 286       Log->Start();
 287
 288    // Run till all things have been acquired
 289    struct timeval tv;
 290    tv.tv_sec = 0;
 291    tv.tv_usec = 500000;
 292    while (ToFetch > 0)
 293    {
 294       fd_set RFds;
 295       fd_set WFds;
 296       int Highest = 0;
 297       FD_ZERO(&RFds);
 298       FD_ZERO(&WFds);
 299       SetFds(Highest,&RFds,&WFds);
 300
 301       int Res;
 302       do
 303       {
 304          Res = select(Highest+1,&RFds,&WFds,0,&tv);
 305       }
 306       while (Res < 0 && errno == EINTR);
 307
 308       if (Res < 0)
 309       {
 310          _error->Errno("select","Select has failed");
 311          break;
 312       }
 313
 314       RunFds(&RFds,&WFds);
 315       if (_error->PendingError() == true)
 316          break;
 317
 318       // Timeout, notify the log class
 319       if (Res == 0 || (Log != 0 && Log->Update == true))
 320       {
 321          tv.tv_usec = 500000;
 322          for (Worker *I = Workers; I != 0; I = I->NextAcquire)
 323             I->Pulse();
 324          if (Log != 0)
 325             Log->Pulse(this);
 326       }
 327    }
 328
 329    if (Log != 0)
 330       Log->Stop();
 331
 332    // Shut down the acquire bits
 333    Running = false;
 334    for (Queue *I = Queues; I != 0; I = I->Next)
 335       I->Shutdown();
 336
 337    return !_error->PendingError();
 338 }
 339                                                                         /*}}}*/
 340 // Acquire::Bump - Called when an item is dequeued                      /*{{{*/
 341 // ---------------------------------------------------------------------
 342 /* This routine bumps idle queues in hopes that they will be able to fetch
 343    the dequeued item */
 344 void pkgAcquire::Bump()
 345 {
 346    for (Queue *I = Queues; I != 0; I = I->Next)
 347       I->Bump();
 348 }
 349                                                                         /*}}}*/
 350 // Acquire::WorkerStep - Step to the next worker                        /*{{{*/
 351 // ---------------------------------------------------------------------
 352 /* Not inlined to advoid including acquire-worker.h */
 353 pkgAcquire::Worker *pkgAcquire::WorkerStep(Worker *I)
 354 {
 355    return I->NextAcquire;
 356 };
 357                                                                         /*}}}*/
 358 // Acquire::Clean - Cleans a directory                                  /*{{{*/
 359 // ---------------------------------------------------------------------
 360 /* This is a bit simplistic, it looks at every file in the dir and sees
 361    if it is part of the download set. */
 362 bool pkgAcquire::Clean(string Dir)
 363 {
 364    DIR *D = opendir(Dir.c_str());
 365    if (D == 0)
 366       return _error->Errno("opendir","Unable to read %s",Dir.c_str());
 367
 368    string StartDir = SafeGetCWD();
 369    if (chdir(Dir.c_str()) != 0)
 370    {
 371       closedir(D);
 372       return _error->Errno("chdir","Unable to change to ",Dir.c_str());
 373    }
 374
 375    for (struct dirent *Dir = readdir(D); Dir != 0; Dir = readdir(D))
 376    {
 377       // Skip some files..
 378       if (strcmp(Dir->d_name,"lock") == 0 ||
 379           strcmp(Dir->d_name,"partial") == 0 ||
 380           strcmp(Dir->d_name,".") == 0 ||
 381           strcmp(Dir->d_name,"..") == 0)
 382          continue;
 383
 384       // Look in the get list
 385       vector<Item *>::iterator I = Items.begin();
 386       for (; I != Items.end(); I++)
 387          if (flNotDir((*I)->DestFile) == Dir->d_name)
 388             break;
 389
 390       // Nothing found, nuke it
 391       if (I == Items.end())
 392          unlink(Dir->d_name);
 393    };
 394
 395    chdir(StartDir.c_str());
 396    closedir(D);
 397    return true;
 398 }
 399                                                                         /*}}}*/
 400 // Acquire::TotalNeeded - Number of bytes to fetch                      /*{{{*/
 401 // ---------------------------------------------------------------------
 402 /* This is the total number of bytes needed */
 403 unsigned long pkgAcquire::TotalNeeded()
 404 {
 405    unsigned long Total = 0;
 406    for (pkgAcquire::Item **I = ItemsBegin(); I != ItemsEnd(); I++)
 407       Total += (*I)->FileSize;
 408    return Total;
 409 }
 410                                                                         /*}}}*/
 411 // Acquire::FetchNeeded - Number of bytes needed to get                 /*{{{*/
 412 // ---------------------------------------------------------------------
 413 /* This is the number of bytes that is not local */
 414 unsigned long pkgAcquire::FetchNeeded()
 415 {
 416    unsigned long Total = 0;
 417    for (pkgAcquire::Item **I = ItemsBegin(); I != ItemsEnd(); I++)
 418       if ((*I)->Local == false)
 419          Total += (*I)->FileSize;
 420    return Total;
 421 }
 422                                                                         /*}}}*/
 423 // pkgAcquire::UriBegin - Start iterator for the uri list               /*{{{*/
 424 // ---------------------------------------------------------------------
 425 /* */
 426 pkgAcquire::UriIterator pkgAcquire::UriBegin()
 427 {
 428    return UriIterator(Queues);
 429 }
 430                                                                         /*}}}*/
 431 // pkgAcquire::UriEnd - End iterator for the uri list                   /*{{{*/
 432 // ---------------------------------------------------------------------
 433 /* */
 434 pkgAcquire::UriIterator pkgAcquire::UriEnd()
 435 {
 436    return UriIterator(0);
 437 }
 438                                                                         /*}}}*/
 439
 440 // Acquire::MethodConfig::MethodConfig - Constructor                    /*{{{*/
 441 // ---------------------------------------------------------------------
 442 /* */
 443 pkgAcquire::MethodConfig::MethodConfig()
 444 {
 445    SingleInstance = false;
 446    Pipeline = false;
 447    SendConfig = false;
 448    LocalOnly = false;
 449    Next = 0;
 450 }
 451                                                                         /*}}}*/
 452
 453 // Queue::Queue - Constructor                                           /*{{{*/
 454 // ---------------------------------------------------------------------
 455 /* */
 456 pkgAcquire::Queue::Queue(string Name,pkgAcquire *Owner) : Name(Name),
 457             Owner(Owner)
 458 {
 459    Items = 0;
 460    Next = 0;
 461    Workers = 0;
 462    MaxPipeDepth = 1;
 463    PipeDepth = 0;
 464 }
 465                                                                         /*}}}*/
 466 // Queue::~Queue - Destructor                                           /*{{{*/
 467 // ---------------------------------------------------------------------
 468 /* */
 469 pkgAcquire::Queue::~Queue()
 470 {
 471    Shutdown();
 472
 473    while (Items != 0)
 474    {
 475       QItem *Jnk = Items;
 476       Items = Items->Next;
 477       delete Jnk;
 478    }
 479 }
 480                                                                         /*}}}*/
 481 // Queue::Enqueue - Queue an item to the queue                          /*{{{*/
 482 // ---------------------------------------------------------------------
 483 /* */
 484 void pkgAcquire::Queue::Enqueue(ItemDesc &Item)
 485 {
 486    QItem **I = &Items;
 487    for (; *I != 0; I = &(*I)->Next);
 488
 489    // Create a new item
 490    QItem *Itm = new QItem;
 491    *Itm = Item;
 492    Itm->Next = 0;
 493    *I = Itm;
 494
 495    Item.Owner->QueueCounter++;
 496    if (Items->Next == 0)
 497       Cycle();
 498 }
 499                                                                         /*}}}*/
 500 // Queue::Dequeue - Remove an item from the queue                       /*{{{*/
 501 // ---------------------------------------------------------------------
 502 /* We return true if we hit something */
 503 bool pkgAcquire::Queue::Dequeue(Item *Owner)
 504 {
 505    if (Owner->Status == pkgAcquire::Item::StatFetching)
 506       return _error->Error("Tried to dequeue a fetching object");
 507
 508    bool Res = false;
 509
 510    QItem **I = &Items;
 511    for (; *I != 0;)
 512    {
 513       if ((*I)->Owner == Owner)
 514       {
 515          QItem *Jnk= *I;
 516          *I = (*I)->Next;
 517          Owner->QueueCounter--;
 518          delete Jnk;
 519          Res = true;
 520       }
 521       else
 522          I = &(*I)->Next;
 523    }
 524
 525    return Res;
 526 }
 527                                                                         /*}}}*/
 528 // Queue::Startup - Start the worker processes                          /*{{{*/
 529 // ---------------------------------------------------------------------
 530 /* */
 531 bool pkgAcquire::Queue::Startup()
 532 {
 533    Shutdown();
 534
 535    URI U(Name);
 536    pkgAcquire::MethodConfig *Cnf = Owner->GetConfig(U.Access);
 537    if (Cnf == 0)
 538       return false;
 539
 540    Workers = new Worker(this,Cnf,Owner->Log);
 541    Owner->Add(Workers);
 542    if (Workers->Start() == false)
 543       return false;
 544
 545    /* When pipelining we commit 10 items. This needs to change when we
 546       added other source retry to have cycle maintain a pipeline depth
 547       on its own. */
 548    if (Cnf->Pipeline == true)
 549       MaxPipeDepth = 10;
 550    else
 551       MaxPipeDepth = 1;
 552
 553    return Cycle();
 554 }
 555                                                                         /*}}}*/
 556 // Queue::Shutdown - Shutdown the worker processes                      /*{{{*/
 557 // ---------------------------------------------------------------------
 558 /* */
 559 bool pkgAcquire::Queue::Shutdown()
 560 {
 561    // Delete all of the workers
 562    while (Workers != 0)
 563    {
 564       pkgAcquire::Worker *Jnk = Workers;
 565       Workers = Workers->NextQueue;
 566       Owner->Remove(Jnk);
 567       delete Jnk;
 568    }
 569
 570    return true;
 571 }
 572                                                                         /*}}}*/
 573 // Queue::FindItem - Find a URI in the item list                        /*{{{*/
 574 // ---------------------------------------------------------------------
 575 /* */
 576 pkgAcquire::Queue::QItem *pkgAcquire::Queue::FindItem(string URI,pkgAcquire::Worker *Owner)
 577 {
 578    for (QItem *I = Items; I != 0; I = I->Next)
 579       if (I->URI == URI && I->Worker == Owner)
 580          return I;
 581    return 0;
 582 }
 583                                                                         /*}}}*/
 584 // Queue::ItemDone - Item has been completed                            /*{{{*/
 585 // ---------------------------------------------------------------------
 586 /* The worker signals this which causes the item to be removed from the
 587    queue. If this is the last queue instance then it is removed from the
 588    main queue too.*/
 589 bool pkgAcquire::Queue::ItemDone(QItem *Itm)
 590 {
 591    PipeDepth--;
 592    if (Itm->Owner->Status == pkgAcquire::Item::StatFetching)
 593       Itm->Owner->Status = pkgAcquire::Item::StatDone;
 594
 595    if (Itm->Owner->QueueCounter <= 1)
 596       Owner->Dequeue(Itm->Owner);
 597    else
 598    {
 599       Dequeue(Itm->Owner);
 600       Owner->Bump();
 601    }
 602
 603    return Cycle();
 604 }
 605                                                                         /*}}}*/
 606 // Queue::Cycle - Queue new items into the method                       /*{{{*/
 607 // ---------------------------------------------------------------------
 608 /* This locates a new idle item and sends it to the worker. If pipelining
 609    is enabled then it keeps the pipe full. */
 610 bool pkgAcquire::Queue::Cycle()
 611 {
 612    if (Items == 0 || Workers == 0)
 613       return true;
 614
 615    if (PipeDepth < 0)
 616       return _error->Error("Pipedepth failure");
 617
 618    // Look for a queable item
 619    QItem *I = Items;
 620    while (PipeDepth < (signed)MaxPipeDepth)
 621    {
 622       for (; I != 0; I = I->Next)
 623          if (I->Owner->Status == pkgAcquire::Item::StatIdle)
 624             break;
 625
 626       // Nothing to do, queue is idle.
 627       if (I == 0)
 628          return true;
 629
 630       I->Worker = Workers;
 631       I->Owner->Status = pkgAcquire::Item::StatFetching;
 632       PipeDepth++;
 633       if (Workers->QueueItem(I) == false)
 634          return false;
 635    }
 636
 637    return true;
 638 }
 639                                                                         /*}}}*/
 640 // Queue::Bump - Fetch any pending objects if we are idle               /*{{{*/
 641 // ---------------------------------------------------------------------
 642 /* This is called when an item in multiple queues is dequeued */
 643 void pkgAcquire::Queue::Bump()
 644 {
 645    Cycle();
 646 }
 647                                                                         /*}}}*/
 648
 649 // AcquireStatus::pkgAcquireStatus - Constructor                        /*{{{*/
 650 // ---------------------------------------------------------------------
 651 /* */
 652 pkgAcquireStatus::pkgAcquireStatus()
 653 {
 654    Start();
 655 }
 656                                                                         /*}}}*/
 657 // AcquireStatus::Pulse - Called periodically                           /*{{{*/
 658 // ---------------------------------------------------------------------
 659 /* This computes some internal state variables for the derived classes to
 660    use. It generates the current downloaded bytes and total bytes to download
 661    as well as the current CPS estimate. */
 662 void pkgAcquireStatus::Pulse(pkgAcquire *Owner)
 663 {
 664    TotalBytes = 0;
 665    CurrentBytes = 0;
 666    TotalItems = 0;
 667    CurrentItems = 0;
 668
 669    // Compute the total number of bytes to fetch
 670    unsigned int Unknown = 0;
 671    unsigned int Count = 0;
 672    for (pkgAcquire::Item **I = Owner->ItemsBegin(); I != Owner->ItemsEnd();
 673         I++, Count++)
 674    {
 675       TotalItems++;
 676       if ((*I)->Status == pkgAcquire::Item::StatDone)
 677          CurrentItems++;
 678
 679       // Totally ignore local items
 680       if ((*I)->Local == true)
 681          continue;
 682
 683       TotalBytes += (*I)->FileSize;
 684       if ((*I)->Complete == true)
 685          CurrentBytes += (*I)->FileSize;
 686       if ((*I)->FileSize == 0 && (*I)->Complete == false)
 687          Unknown++;
 688    }
 689
 690    // Compute the current completion
 691    for (pkgAcquire::Worker *I = Owner->WorkersBegin(); I != 0;
 692         I = Owner->WorkerStep(I))
 693       if (I->CurrentItem != 0 && I->CurrentItem->Owner->Complete == false)
 694          CurrentBytes += I->CurrentSize;
 695
 696    // Normalize the figures and account for unknown size downloads
 697    if (TotalBytes <= 0)
 698       TotalBytes = 1;
 699    if (Unknown == Count)
 700       TotalBytes = Unknown;
 701    else
 702       TotalBytes += TotalBytes/(Count - Unknown)*Unknown;
 703
 704    // Compute the CPS
 705    struct timeval NewTime;
 706    gettimeofday(&NewTime,0);
 707    if (NewTime.tv_sec - Time.tv_sec == 6 && NewTime.tv_usec > Time.tv_usec ||
 708        NewTime.tv_sec - Time.tv_sec > 6)
 709    {
 710       double Delta = NewTime.tv_sec - Time.tv_sec +
 711                      (NewTime.tv_usec - Time.tv_usec)/1000000.0;
 712
 713       // Compute the CPS value
 714       if (Delta < 0.01)
 715          CurrentCPS = 0;
 716       else
 717          CurrentCPS = (CurrentBytes - LastBytes)/Delta;
 718       LastBytes = CurrentBytes;
 719       ElapsedTime = (unsigned long)Delta;
 720       Time = NewTime;
 721    }
 722 }
 723                                                                         /*}}}*/
 724 // AcquireStatus::Start - Called when the download is started           /*{{{*/
 725 // ---------------------------------------------------------------------
 726 /* We just reset the counters */
 727 void pkgAcquireStatus::Start()
 728 {
 729    gettimeofday(&Time,0);
 730    gettimeofday(&StartTime,0);
 731    LastBytes = 0;
 732    CurrentCPS = 0;
 733    CurrentBytes = 0;
 734    TotalBytes = 0;
 735    FetchedBytes = 0;
 736    ElapsedTime = 0;
 737    TotalItems = 0;
 738    CurrentItems = 0;
 739 }
 740                                                                         /*}}}*/
 741 // AcquireStatus::Stop - Finished downloading                           /*{{{*/
 742 // ---------------------------------------------------------------------
 743 /* This accurately computes the elapsed time and the total overall CPS. */
 744 void pkgAcquireStatus::Stop()
 745 {
 746    // Compute the CPS and elapsed time
 747    struct timeval NewTime;
 748    gettimeofday(&NewTime,0);
 749
 750    // Compute the delta time with full accuracy
 751    long usdiff = NewTime.tv_usec - StartTime.tv_usec;
 752    long sdiff = NewTime.tv_sec - StartTime.tv_sec;
 753
 754    // Borrow
 755    if (usdiff < 0)
 756    {
 757       usdiff += 1000000;
 758       sdiff--;
 759    }
 760
 761    // Compute the CPS value
 762    if (sdiff == 0 && usdiff == 0)
 763       CurrentCPS = 0;
 764    else
 765       CurrentCPS = FetchedBytes/(sdiff + usdiff/1000000.0);
 766    LastBytes = CurrentBytes;
 767    ElapsedTime = sdiff;
 768 }
 769                                                                         /*}}}*/
 770 // AcquireStatus::Fetched - Called when a byte set has been fetched     /*{{{*/
 771 // ---------------------------------------------------------------------
 772 /* This is used to get accurate final transfer rate reporting. */
 773 void pkgAcquireStatus::Fetched(unsigned long Size,unsigned long Resume)
 774 {
 775    FetchedBytes += Size - Resume;
 776 }
 777                                                                         /*}}}*/