apt-pkg/acquire.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: acquire.cc,v 1.50 2004/03/17 05:17:11 mdz Exp $
   4 /* ######################################################################
   5
   6    Acquire - File Acquiration
   7
   8    The core element for the schedule 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 controlled by how the queue
  11    name is derived from the URI.
  12
  13    ##################################################################### */
  14                                                                         /*}}}*/
  15 // Include Files                                                        /*{{{*/
  16 #include <config.h>
  17
  18 #include <apt-pkg/acquire.h>
  19 #include <apt-pkg/acquire-item.h>
  20 #include <apt-pkg/acquire-worker.h>
  21 #include <apt-pkg/configuration.h>
  22 #include <apt-pkg/error.h>
  23 #include <apt-pkg/strutl.h>
  24 #include <apt-pkg/fileutl.h>
  25
  26 #include <algorithm>
  27 #include <numeric>
  28 #include <string>
  29 #include <vector>
  30 #include <iostream>
  31 #include <sstream>
  32 #include <iomanip>
  33 #include <memory>
  34
  35 #include <stdio.h>
  36 #include <stdlib.h>
  37 #include <string.h>
  38 #include <unistd.h>
  39 #include <fcntl.h>
  40 #include <pwd.h>
  41 #include <grp.h>
  42 #include <dirent.h>
  43 #include <sys/time.h>
  44 #include <sys/select.h>
  45 #include <errno.h>
  46 #include <sys/stat.h>
  47
  48 #include <apti18n.h>
  49                                                                         /*}}}*/
  50
  51 using namespace std;
  52
  53 // Acquire::pkgAcquire - Constructor                                    /*{{{*/
  54 // ---------------------------------------------------------------------
  55 /* We grab some runtime state from the configuration space */
  56 pkgAcquire::pkgAcquire() : LockFD(-1), d(NULL), Queues(0), Workers(0), Configs(0), Log(NULL), ToFetch(0),
  57                            Debug(_config->FindB("Debug::pkgAcquire",false)),
  58                            Running(false)
  59 {
  60    Initialize();
  61 }
  62 pkgAcquire::pkgAcquire(pkgAcquireStatus *Progress) : LockFD(-1), d(NULL), Queues(0), Workers(0),
  63                            Configs(0), Log(NULL), ToFetch(0),
  64                            Debug(_config->FindB("Debug::pkgAcquire",false)),
  65                            Running(false)
  66 {
  67    Initialize();
  68    SetLog(Progress);
  69 }
  70 void pkgAcquire::Initialize()
  71 {
  72    string const Mode = _config->Find("Acquire::Queue-Mode","host");
  73    if (strcasecmp(Mode.c_str(),"host") == 0)
  74       QueueMode = QueueHost;
  75    if (strcasecmp(Mode.c_str(),"access") == 0)
  76       QueueMode = QueueAccess;
  77
  78    // chown the auth.conf file as it will be accessed by our methods
  79    std::string const SandboxUser = _config->Find("APT::Sandbox::User");
  80    if (getuid() == 0 && SandboxUser.empty() == false && SandboxUser != "root") // if we aren't root, we can't chown, so don't try it
  81    {
  82       struct passwd const * const pw = getpwnam(SandboxUser.c_str());
  83       struct group const * const gr = getgrnam("root");
  84       if (pw != NULL && gr != NULL)
  85       {
  86          std::string const AuthConf = _config->FindFile("Dir::Etc::netrc");
  87          if(AuthConf.empty() == false && RealFileExists(AuthConf) &&
  88                chown(AuthConf.c_str(), pw->pw_uid, gr->gr_gid) != 0)
  89             _error->WarningE("SetupAPTPartialDirectory", "chown to %s:root of file %s failed", SandboxUser.c_str(), AuthConf.c_str());
  90       }
  91    }
  92 }
  93                                                                         /*}}}*/
  94 // Acquire::GetLock - lock directory and prepare for action             /*{{{*/
  95 static bool SetupAPTPartialDirectory(std::string const &grand, std::string const &parent)
  96 {
  97    std::string const partial = parent + "partial";
  98    mode_t const mode = umask(S_IWGRP | S_IWOTH);
  99    bool const creation_fail = (CreateAPTDirectoryIfNeeded(grand, partial) == false &&
 100          CreateAPTDirectoryIfNeeded(parent, partial) == false);
 101    umask(mode);
 102    if (creation_fail == true)
 103       return false;
 104
 105    std::string const SandboxUser = _config->Find("APT::Sandbox::User");
 106    if (getuid() == 0 && SandboxUser.empty() == false && SandboxUser != "root") // if we aren't root, we can't chown, so don't try it
 107    {
 108       struct passwd const * const pw = getpwnam(SandboxUser.c_str());
 109       struct group const * const gr = getgrnam("root");
 110       if (pw != NULL && gr != NULL)
 111       {
 112          // chown the partial dir
 113          if(chown(partial.c_str(), pw->pw_uid, gr->gr_gid) != 0)
 114             _error->WarningE("SetupAPTPartialDirectory", "chown to %s:root of directory %s failed", SandboxUser.c_str(), partial.c_str());
 115       }
 116    }
 117    if (chmod(partial.c_str(), 0700) != 0)
 118       _error->WarningE("SetupAPTPartialDirectory", "chmod 0700 of directory %s failed", partial.c_str());
 119
 120    return true;
 121 }
 122 bool pkgAcquire::Setup(pkgAcquireStatus *Progress, string const &Lock)
 123 {
 124    Log = Progress;
 125    if (Lock.empty())
 126    {
 127       string const listDir = _config->FindDir("Dir::State::lists");
 128       if (SetupAPTPartialDirectory(_config->FindDir("Dir::State"), listDir) == false)
 129          return _error->Errno("Acquire", _("List directory %spartial is missing."), listDir.c_str());
 130       string const archivesDir = _config->FindDir("Dir::Cache::Archives");
 131       if (SetupAPTPartialDirectory(_config->FindDir("Dir::Cache"), archivesDir) == false)
 132          return _error->Errno("Acquire", _("Archives directory %spartial is missing."), archivesDir.c_str());
 133       return true;
 134    }
 135    return GetLock(Lock);
 136 }
 137 bool pkgAcquire::GetLock(std::string const &Lock)
 138 {
 139    if (Lock.empty() == true)
 140       return false;
 141
 142    // check for existence and possibly create auxiliary directories
 143    string const listDir = _config->FindDir("Dir::State::lists");
 144    string const archivesDir = _config->FindDir("Dir::Cache::Archives");
 145
 146    if (Lock == listDir)
 147    {
 148       if (SetupAPTPartialDirectory(_config->FindDir("Dir::State"), listDir) == false)
 149          return _error->Errno("Acquire", _("List directory %spartial is missing."), listDir.c_str());
 150    }
 151    if (Lock == archivesDir)
 152    {
 153       if (SetupAPTPartialDirectory(_config->FindDir("Dir::Cache"), archivesDir) == false)
 154          return _error->Errno("Acquire", _("Archives directory %spartial is missing."), archivesDir.c_str());
 155    }
 156
 157    if (_config->FindB("Debug::NoLocking", false) == true)
 158       return true;
 159
 160    // Lock the directory this acquire object will work in
 161    if (LockFD != -1)
 162       close(LockFD);
 163    LockFD = ::GetLock(flCombine(Lock, "lock"));
 164    if (LockFD == -1)
 165       return _error->Error(_("Unable to lock directory %s"), Lock.c_str());
 166
 167    return true;
 168 }
 169                                                                         /*}}}*/
 170 // Acquire::~pkgAcquire - Destructor                                    /*{{{*/
 171 // ---------------------------------------------------------------------
 172 /* Free our memory, clean up the queues (destroy the workers) */
 173 pkgAcquire::~pkgAcquire()
 174 {
 175    Shutdown();
 176
 177    if (LockFD != -1)
 178       close(LockFD);
 179
 180    while (Configs != 0)
 181    {
 182       MethodConfig *Jnk = Configs;
 183       Configs = Configs->Next;
 184       delete Jnk;
 185    }
 186 }
 187                                                                         /*}}}*/
 188 // Acquire::Shutdown - Clean out the acquire object                     /*{{{*/
 189 // ---------------------------------------------------------------------
 190 /* */
 191 void pkgAcquire::Shutdown()
 192 {
 193    while (Items.empty() == false)
 194    {
 195       if (Items[0]->Status == Item::StatFetching)
 196          Items[0]->Status = Item::StatError;
 197       delete Items[0];
 198    }
 199
 200    while (Queues != 0)
 201    {
 202       Queue *Jnk = Queues;
 203       Queues = Queues->Next;
 204       delete Jnk;
 205    }
 206 }
 207                                                                         /*}}}*/
 208 // Acquire::Add - Add a new item                                        /*{{{*/
 209 // ---------------------------------------------------------------------
 210 /* This puts an item on the acquire list. This list is mainly for tracking
 211    item status */
 212 void pkgAcquire::Add(Item *Itm)
 213 {
 214    Items.push_back(Itm);
 215 }
 216                                                                         /*}}}*/
 217 // Acquire::Remove - Remove a item                                      /*{{{*/
 218 // ---------------------------------------------------------------------
 219 /* Remove an item from the acquire list. This is usually not used.. */
 220 void pkgAcquire::Remove(Item *Itm)
 221 {
 222    Dequeue(Itm);
 223
 224    for (ItemIterator I = Items.begin(); I != Items.end();)
 225    {
 226       if (*I == Itm)
 227       {
 228          Items.erase(I);
 229          I = Items.begin();
 230       }
 231       else
 232          ++I;
 233    }
 234 }
 235                                                                         /*}}}*/
 236 // Acquire::Add - Add a worker                                          /*{{{*/
 237 // ---------------------------------------------------------------------
 238 /* A list of workers is kept so that the select loop can direct their FD
 239    usage. */
 240 void pkgAcquire::Add(Worker *Work)
 241 {
 242    Work->NextAcquire = Workers;
 243    Workers = Work;
 244 }
 245                                                                         /*}}}*/
 246 // Acquire::Remove - Remove a worker                                    /*{{{*/
 247 // ---------------------------------------------------------------------
 248 /* A worker has died. This can not be done while the select loop is running
 249    as it would require that RunFds could handling a changing list state and
 250    it can't.. */
 251 void pkgAcquire::Remove(Worker *Work)
 252 {
 253    if (Running == true)
 254       abort();
 255
 256    Worker **I = &Workers;
 257    for (; *I != 0;)
 258    {
 259       if (*I == Work)
 260          *I = (*I)->NextAcquire;
 261       else
 262          I = &(*I)->NextAcquire;
 263    }
 264 }
 265                                                                         /*}}}*/
 266 // Acquire::Enqueue - Queue an URI for fetching                         /*{{{*/
 267 // ---------------------------------------------------------------------
 268 /* This is the entry point for an item. An item calls this function when
 269    it is constructed which creates a queue (based on the current queue
 270    mode) and puts the item in that queue. If the system is running then
 271    the queue might be started. */
 272 void pkgAcquire::Enqueue(ItemDesc &Item)
 273 {
 274    // Determine which queue to put the item in
 275    const MethodConfig *Config;
 276    string Name = QueueName(Item.URI,Config);
 277    if (Name.empty() == true)
 278       return;
 279
 280    // Find the queue structure
 281    Queue *I = Queues;
 282    for (; I != 0 && I->Name != Name; I = I->Next);
 283    if (I == 0)
 284    {
 285       I = new Queue(Name,this);
 286       I->Next = Queues;
 287       Queues = I;
 288
 289       if (Running == true)
 290          I->Startup();
 291    }
 292
 293    // See if this is a local only URI
 294    if (Config->LocalOnly == true && Item.Owner->Complete == false)
 295       Item.Owner->Local = true;
 296    Item.Owner->Status = Item::StatIdle;
 297
 298    // Queue it into the named queue
 299    if(I->Enqueue(Item))
 300       ToFetch++;
 301
 302    // Some trace stuff
 303    if (Debug == true)
 304    {
 305       clog << "Fetching " << Item.URI << endl;
 306       clog << " to " << Item.Owner->DestFile << endl;
 307       clog << " Queue is: " << Name << endl;
 308    }
 309 }
 310                                                                         /*}}}*/
 311 // Acquire::Dequeue - Remove an item from all queues                    /*{{{*/
 312 // ---------------------------------------------------------------------
 313 /* This is called when an item is finished being fetched. It removes it
 314    from all the queues */
 315 void pkgAcquire::Dequeue(Item *Itm)
 316 {
 317    Queue *I = Queues;
 318    bool Res = false;
 319    if (Debug == true)
 320       clog << "Dequeuing " << Itm->DestFile << endl;
 321
 322    for (; I != 0; I = I->Next)
 323    {
 324       if (I->Dequeue(Itm))
 325       {
 326          Res = true;
 327          if (Debug == true)
 328             clog << "Dequeued from " << I->Name << endl;
 329       }
 330    }
 331
 332    if (Res == true)
 333       ToFetch--;
 334 }
 335                                                                         /*}}}*/
 336 // Acquire::QueueName - Return the name of the queue for this URI       /*{{{*/
 337 // ---------------------------------------------------------------------
 338 /* The string returned depends on the configuration settings and the
 339    method parameters. Given something like http://foo.org/bar it can
 340    return http://foo.org or http */
 341 string pkgAcquire::QueueName(string Uri,MethodConfig const *&Config)
 342 {
 343    URI U(Uri);
 344
 345    Config = GetConfig(U.Access);
 346    if (Config == 0)
 347       return string();
 348
 349    /* Single-Instance methods get exactly one queue per URI. This is
 350       also used for the Access queue method  */
 351    if (Config->SingleInstance == true || QueueMode == QueueAccess)
 352       return U.Access;
 353
 354    string AccessSchema = U.Access + ':';
 355    string FullQueueName;
 356
 357    if (U.Host.empty())
 358    {
 359       long existing = 0;
 360       // check how many queues exist already and reuse empty ones
 361       for (Queue const *I = Queues; I != 0; I = I->Next)
 362          if (I->Name.compare(0, AccessSchema.length(), AccessSchema) == 0)
 363          {
 364             if (I->Items == nullptr)
 365                return I->Name;
 366             ++existing;
 367          }
 368
 369 #ifdef _SC_NPROCESSORS_ONLN
 370       long cpuCount = sysconf(_SC_NPROCESSORS_ONLN) * 2;
 371 #else
 372       long cpuCount = 10;
 373 #endif
 374       cpuCount = _config->FindI("Acquire::QueueHost::Limit", cpuCount);
 375
 376       if (cpuCount <= 0 || existing < cpuCount)
 377          strprintf(FullQueueName, "%s%ld", AccessSchema.c_str(), existing);
 378       else
 379       {
 380          long const randomQueue = random() % cpuCount;
 381          strprintf(FullQueueName, "%s%ld", AccessSchema.c_str(), randomQueue);
 382       }
 383
 384       if (Debug)
 385          clog << "Chose random queue " << FullQueueName << " for " << Uri << endl;
 386    } else
 387    {
 388       FullQueueName = AccessSchema + U.Host;
 389    }
 390    unsigned int Instances = 0, SchemaLength = AccessSchema.length();
 391
 392    Queue *I = Queues;
 393    for (; I != 0; I = I->Next) {
 394       // if the queue already exists, re-use it
 395       if (I->Name == FullQueueName)
 396          return FullQueueName;
 397
 398       if (I->Name.compare(0, SchemaLength, AccessSchema) == 0)
 399          Instances++;
 400    }
 401
 402    if (Debug) {
 403       clog << "Found " << Instances << " instances of " << U.Access << endl;
 404    }
 405
 406    if (Instances >= (unsigned int)_config->FindI("Acquire::QueueHost::Limit",10))
 407       return U.Access;
 408
 409    return FullQueueName;
 410 }
 411                                                                         /*}}}*/
 412 // Acquire::GetConfig - Fetch the configuration information             /*{{{*/
 413 // ---------------------------------------------------------------------
 414 /* This locates the configuration structure for an access method. If
 415    a config structure cannot be found a Worker will be created to
 416    retrieve it */
 417 pkgAcquire::MethodConfig *pkgAcquire::GetConfig(string Access)
 418 {
 419    // Search for an existing config
 420    MethodConfig *Conf;
 421    for (Conf = Configs; Conf != 0; Conf = Conf->Next)
 422       if (Conf->Access == Access)
 423          return Conf;
 424
 425    // Create the new config class
 426    Conf = new MethodConfig;
 427    Conf->Access = Access;
 428    Conf->Next = Configs;
 429    Configs = Conf;
 430
 431    // Create the worker to fetch the configuration
 432    Worker Work(Conf);
 433    if (Work.Start() == false)
 434       return 0;
 435
 436    /* if a method uses DownloadLimit, we switch to SingleInstance mode */
 437    if(_config->FindI("Acquire::"+Access+"::Dl-Limit",0) > 0)
 438       Conf->SingleInstance = true;
 439
 440    return Conf;
 441 }
 442                                                                         /*}}}*/
 443 // Acquire::SetFds - Deal with readable FDs                             /*{{{*/
 444 // ---------------------------------------------------------------------
 445 /* Collect FDs that have activity monitors into the fd sets */
 446 void pkgAcquire::SetFds(int &Fd,fd_set *RSet,fd_set *WSet)
 447 {
 448    for (Worker *I = Workers; I != 0; I = I->NextAcquire)
 449    {
 450       if (I->InReady == true && I->InFd >= 0)
 451       {
 452          if (Fd < I->InFd)
 453             Fd = I->InFd;
 454          FD_SET(I->InFd,RSet);
 455       }
 456       if (I->OutReady == true && I->OutFd >= 0)
 457       {
 458          if (Fd < I->OutFd)
 459             Fd = I->OutFd;
 460          FD_SET(I->OutFd,WSet);
 461       }
 462    }
 463 }
 464                                                                         /*}}}*/
 465 // Acquire::RunFds - compatibility remove on next abi/api break         /*{{{*/
 466 void pkgAcquire::RunFds(fd_set *RSet,fd_set *WSet)
 467 {
 468    RunFdsSane(RSet, WSet);
 469 }
 470                                                                         /*}}}*/
 471 // Acquire::RunFdsSane - Deal with active FDs                           /*{{{*/
 472 // ---------------------------------------------------------------------
 473 /* Dispatch active FDs over to the proper workers. It is very important
 474    that a worker never be erased while this is running! The queue class
 475    should never erase a worker except during shutdown processing. */
 476 bool pkgAcquire::RunFdsSane(fd_set *RSet,fd_set *WSet)
 477 {
 478    bool Res = true;
 479
 480    for (Worker *I = Workers; I != 0; I = I->NextAcquire)
 481    {
 482       if (I->InFd >= 0 && FD_ISSET(I->InFd,RSet) != 0)
 483          Res &= I->InFdReady();
 484       if (I->OutFd >= 0 && FD_ISSET(I->OutFd,WSet) != 0)
 485          Res &= I->OutFdReady();
 486    }
 487
 488    return Res;
 489 }
 490                                                                         /*}}}*/
 491 // Acquire::Run - Run the fetch sequence                                /*{{{*/
 492 // ---------------------------------------------------------------------
 493 /* This runs the queues. It manages a select loop for all of the
 494    Worker tasks. The workers interact with the queues and items to
 495    manage the actual fetch. */
 496 static bool IsAccessibleBySandboxUser(std::string const &filename, bool const ReadWrite)
 497 {
 498    // you would think this is easily to answer with faccessat, right? Wrong!
 499    // It e.g. gets groups wrong, so the only thing which works reliable is trying
 500    // to open the file we want to open later on…
 501    if (unlikely(filename.empty()))
 502       return true;
 503
 504    if (ReadWrite == false)
 505    {
 506       errno = 0;
 507       // can we read a file? Note that non-existing files are "fine"
 508       int const fd = open(filename.c_str(), O_RDONLY | O_CLOEXEC);
 509       if (fd == -1 && errno == EACCES)
 510          return false;
 511       close(fd);
 512       return true;
 513    }
 514    else
 515    {
 516       // the file might not exist yet and even if it does we will fix permissions,
 517       // so important is here just that the directory it is in allows that
 518       std::string const dirname = flNotFile(filename);
 519       if (unlikely(dirname.empty()))
 520          return true;
 521
 522       char const * const filetag = ".apt-acquire-privs-test.XXXXXX";
 523       std::string const tmpfile_tpl = flCombine(dirname, filetag);
 524       std::unique_ptr<char, decltype(std::free) *> tmpfile { strdup(tmpfile_tpl.c_str()), std::free };
 525       int const fd = mkstemp(tmpfile.get());
 526       if (fd == -1 && errno == EACCES)
 527          return false;
 528       RemoveFile("IsAccessibleBySandboxUser", tmpfile.get());
 529       close(fd);
 530       return true;
 531    }
 532 }
 533 static void CheckDropPrivsMustBeDisabled(pkgAcquire const &Fetcher)
 534 {
 535    if(getuid() != 0)
 536       return;
 537
 538    std::string const SandboxUser = _config->Find("APT::Sandbox::User");
 539    if (SandboxUser.empty() || SandboxUser == "root")
 540       return;
 541
 542    struct passwd const * const pw = getpwnam(SandboxUser.c_str());
 543    if (pw == NULL)
 544    {
 545       _error->Warning(_("No sandbox user '%s' on the system, can not drop privileges"), SandboxUser.c_str());
 546       _config->Set("APT::Sandbox::User", "");
 547       return;
 548    }
 549
 550    gid_t const old_euid = geteuid();
 551    gid_t const old_egid = getegid();
 552
 553    long const ngroups_max = sysconf(_SC_NGROUPS_MAX);
 554    std::unique_ptr<gid_t[]> old_gidlist(new gid_t[ngroups_max]);
 555    if (unlikely(old_gidlist == NULL))
 556       return;
 557    ssize_t old_gidlist_nr;
 558    if ((old_gidlist_nr = getgroups(ngroups_max, old_gidlist.get())) < 0)
 559    {
 560       _error->FatalE("getgroups", "getgroups %lu failed", ngroups_max);
 561       old_gidlist[0] = 0;
 562       old_gidlist_nr = 1;
 563    }
 564    if (setgroups(1, &pw->pw_gid))
 565       _error->FatalE("setgroups", "setgroups %u failed", pw->pw_gid);
 566
 567    if (setegid(pw->pw_gid) != 0)
 568       _error->FatalE("setegid", "setegid %u failed", pw->pw_gid);
 569    if (seteuid(pw->pw_uid) != 0)
 570       _error->FatalE("seteuid", "seteuid %u failed", pw->pw_uid);
 571
 572    for (pkgAcquire::ItemCIterator I = Fetcher.ItemsBegin();
 573         I != Fetcher.ItemsEnd(); ++I)
 574    {
 575       // no need to drop privileges for a complete file
 576       if ((*I)->Complete == true || (*I)->Status != pkgAcquire::Item::StatIdle)
 577          continue;
 578
 579       // if destination file is inaccessible all hope is lost for privilege dropping
 580       if (IsAccessibleBySandboxUser((*I)->DestFile, true) == false)
 581       {
 582          _error->WarningE("pkgAcquire::Run", _("Can't drop privileges for downloading as file '%s' couldn't be accessed by user '%s'."),
 583                (*I)->DestFile.c_str(), SandboxUser.c_str());
 584          _config->Set("APT::Sandbox::User", "");
 585          break;
 586       }
 587
 588       // if its the source file (e.g. local sources) we might be lucky
 589       // by dropping the dropping only for some methods.
 590       URI const source = (*I)->DescURI();
 591       if (source.Access == "file" || source.Access == "copy")
 592       {
 593          std::string const conf = "Binary::" + source.Access + "::APT::Sandbox::User";
 594          if (_config->Exists(conf) == true)
 595             continue;
 596
 597          if (IsAccessibleBySandboxUser(source.Path, false) == false)
 598          {
 599             _error->NoticeE("pkgAcquire::Run", _("Can't drop privileges for downloading as file '%s' couldn't be accessed by user '%s'."),
 600                   source.Path.c_str(), SandboxUser.c_str());
 601             _config->CndSet("Binary::file::APT::Sandbox::User", "root");
 602             _config->CndSet("Binary::copy::APT::Sandbox::User", "root");
 603          }
 604       }
 605    }
 606
 607    if (seteuid(old_euid) != 0)
 608       _error->FatalE("seteuid", "seteuid %u failed", old_euid);
 609    if (setegid(old_egid) != 0)
 610       _error->FatalE("setegid", "setegid %u failed", old_egid);
 611    if (setgroups(old_gidlist_nr, old_gidlist.get()))
 612       _error->FatalE("setgroups", "setgroups %u failed", 0);
 613 }
 614 pkgAcquire::RunResult pkgAcquire::Run(int PulseIntervall)
 615 {
 616    _error->PushToStack();
 617    CheckDropPrivsMustBeDisabled(*this);
 618
 619    Running = true;
 620
 621    for (Queue *I = Queues; I != 0; I = I->Next)
 622       I->Startup();
 623
 624    if (Log != 0)
 625       Log->Start();
 626
 627    bool WasCancelled = false;
 628
 629    // Run till all things have been acquired
 630    struct timeval tv;
 631    tv.tv_sec = 0;
 632    tv.tv_usec = PulseIntervall;
 633    while (ToFetch > 0)
 634    {
 635       fd_set RFds;
 636       fd_set WFds;
 637       int Highest = 0;
 638       FD_ZERO(&RFds);
 639       FD_ZERO(&WFds);
 640       SetFds(Highest,&RFds,&WFds);
 641
 642       int Res;
 643       do
 644       {
 645          Res = select(Highest+1,&RFds,&WFds,0,&tv);
 646       }
 647       while (Res < 0 && errno == EINTR);
 648
 649       if (Res < 0)
 650       {
 651          _error->Errno("select","Select has failed");
 652          break;
 653       }
 654
 655       if(RunFdsSane(&RFds,&WFds) == false)
 656          break;
 657
 658       // Timeout, notify the log class
 659       if (Res == 0 || (Log != 0 && Log->Update == true))
 660       {
 661          tv.tv_usec = PulseIntervall;
 662          for (Worker *I = Workers; I != 0; I = I->NextAcquire)
 663             I->Pulse();
 664          if (Log != 0 && Log->Pulse(this) == false)
 665          {
 666             WasCancelled = true;
 667             break;
 668          }
 669       }
 670    }
 671
 672    if (Log != 0)
 673       Log->Stop();
 674
 675    // Shut down the acquire bits
 676    Running = false;
 677    for (Queue *I = Queues; I != 0; I = I->Next)
 678       I->Shutdown(false);
 679
 680    // Shut down the items
 681    for (ItemIterator I = Items.begin(); I != Items.end(); ++I)
 682       (*I)->Finished();
 683
 684    bool const newError = _error->PendingError();
 685    _error->MergeWithStack();
 686    if (newError)
 687       return Failed;
 688    if (WasCancelled)
 689       return Cancelled;
 690    return Continue;
 691 }
 692                                                                         /*}}}*/
 693 // Acquire::Bump - Called when an item is dequeued                      /*{{{*/
 694 // ---------------------------------------------------------------------
 695 /* This routine bumps idle queues in hopes that they will be able to fetch
 696    the dequeued item */
 697 void pkgAcquire::Bump()
 698 {
 699    for (Queue *I = Queues; I != 0; I = I->Next)
 700       I->Bump();
 701 }
 702                                                                         /*}}}*/
 703 // Acquire::WorkerStep - Step to the next worker                        /*{{{*/
 704 // ---------------------------------------------------------------------
 705 /* Not inlined to advoid including acquire-worker.h */
 706 pkgAcquire::Worker *pkgAcquire::WorkerStep(Worker *I)
 707 {
 708    return I->NextAcquire;
 709 }
 710                                                                         /*}}}*/
 711 // Acquire::Clean - Cleans a directory                                  /*{{{*/
 712 // ---------------------------------------------------------------------
 713 /* This is a bit simplistic, it looks at every file in the dir and sees
 714    if it is part of the download set. */
 715 bool pkgAcquire::Clean(string Dir)
 716 {
 717    // non-existing directories are by definition clean…
 718    if (DirectoryExists(Dir) == false)
 719       return true;
 720
 721    if(Dir == "/")
 722       return _error->Error(_("Clean of %s is not supported"), Dir.c_str());
 723
 724    DIR *D = opendir(Dir.c_str());
 725    if (D == 0)
 726       return _error->Errno("opendir",_("Unable to read %s"),Dir.c_str());
 727
 728    string StartDir = SafeGetCWD();
 729    if (chdir(Dir.c_str()) != 0)
 730    {
 731       closedir(D);
 732       return _error->Errno("chdir",_("Unable to change to %s"),Dir.c_str());
 733    }
 734
 735    for (struct dirent *Dir = readdir(D); Dir != 0; Dir = readdir(D))
 736    {
 737       // Skip some files..
 738       if (strcmp(Dir->d_name,"lock") == 0 ||
 739           strcmp(Dir->d_name,"partial") == 0 ||
 740           strcmp(Dir->d_name,"lost+found") == 0 ||
 741           strcmp(Dir->d_name,".") == 0 ||
 742           strcmp(Dir->d_name,"..") == 0)
 743          continue;
 744
 745       // Look in the get list
 746       ItemCIterator I = Items.begin();
 747       for (; I != Items.end(); ++I)
 748          if (flNotDir((*I)->DestFile) == Dir->d_name)
 749             break;
 750
 751       // Nothing found, nuke it
 752       if (I == Items.end())
 753          RemoveFile("Clean", Dir->d_name);
 754    };
 755
 756    closedir(D);
 757    if (chdir(StartDir.c_str()) != 0)
 758       return _error->Errno("chdir",_("Unable to change to %s"),StartDir.c_str());
 759    return true;
 760 }
 761                                                                         /*}}}*/
 762 // Acquire::TotalNeeded - Number of bytes to fetch                      /*{{{*/
 763 // ---------------------------------------------------------------------
 764 /* This is the total number of bytes needed */
 765 APT_PURE unsigned long long pkgAcquire::TotalNeeded()
 766 {
 767    return std::accumulate(ItemsBegin(), ItemsEnd(), 0llu,
 768       [](unsigned long long const T, Item const * const I) {
 769          return T + I->FileSize;
 770    });
 771 }
 772                                                                         /*}}}*/
 773 // Acquire::FetchNeeded - Number of bytes needed to get                 /*{{{*/
 774 // ---------------------------------------------------------------------
 775 /* This is the number of bytes that is not local */
 776 APT_PURE unsigned long long pkgAcquire::FetchNeeded()
 777 {
 778    return std::accumulate(ItemsBegin(), ItemsEnd(), 0llu,
 779       [](unsigned long long const T, Item const * const I) {
 780          if (I->Local == false)
 781             return T + I->FileSize;
 782          else
 783             return T;
 784    });
 785 }
 786                                                                         /*}}}*/
 787 // Acquire::PartialPresent - Number of partial bytes we already have    /*{{{*/
 788 // ---------------------------------------------------------------------
 789 /* This is the number of bytes that is not local */
 790 APT_PURE unsigned long long pkgAcquire::PartialPresent()
 791 {
 792    return std::accumulate(ItemsBegin(), ItemsEnd(), 0llu,
 793       [](unsigned long long const T, Item const * const I) {
 794          if (I->Local == false)
 795             return T + I->PartialSize;
 796          else
 797             return T;
 798    });
 799 }
 800                                                                         /*}}}*/
 801 // Acquire::UriBegin - Start iterator for the uri list                  /*{{{*/
 802 // ---------------------------------------------------------------------
 803 /* */
 804 pkgAcquire::UriIterator pkgAcquire::UriBegin()
 805 {
 806    return UriIterator(Queues);
 807 }
 808                                                                         /*}}}*/
 809 // Acquire::UriEnd - End iterator for the uri list                      /*{{{*/
 810 // ---------------------------------------------------------------------
 811 /* */
 812 pkgAcquire::UriIterator pkgAcquire::UriEnd()
 813 {
 814    return UriIterator(0);
 815 }
 816                                                                         /*}}}*/
 817 // Acquire::MethodConfig::MethodConfig - Constructor                    /*{{{*/
 818 // ---------------------------------------------------------------------
 819 /* */
 820 pkgAcquire::MethodConfig::MethodConfig() : d(NULL), Next(0), SingleInstance(false),
 821    Pipeline(false), SendConfig(false), LocalOnly(false), NeedsCleanup(false),
 822    Removable(false)
 823 {
 824 }
 825                                                                         /*}}}*/
 826 // Queue::Queue - Constructor                                           /*{{{*/
 827 // ---------------------------------------------------------------------
 828 /* */
 829 pkgAcquire::Queue::Queue(string const &name,pkgAcquire * const owner) : d(NULL), Next(0),
 830    Name(name), Items(0), Workers(0), Owner(owner), PipeDepth(0), MaxPipeDepth(1)
 831 {
 832 }
 833                                                                         /*}}}*/
 834 // Queue::~Queue - Destructor                                           /*{{{*/
 835 // ---------------------------------------------------------------------
 836 /* */
 837 pkgAcquire::Queue::~Queue()
 838 {
 839    Shutdown(true);
 840
 841    while (Items != 0)
 842    {
 843       QItem *Jnk = Items;
 844       Items = Items->Next;
 845       delete Jnk;
 846    }
 847 }
 848                                                                         /*}}}*/
 849 // Queue::Enqueue - Queue an item to the queue                          /*{{{*/
 850 // ---------------------------------------------------------------------
 851 /* */
 852 bool pkgAcquire::Queue::Enqueue(ItemDesc &Item)
 853 {
 854    QItem **I = &Items;
 855    // move to the end of the queue and check for duplicates here
 856    for (; *I != 0; I = &(*I)->Next)
 857       if (Item.URI == (*I)->URI)
 858       {
 859          if (_config->FindB("Debug::pkgAcquire::Worker",false) == true)
 860             std::cerr << " @ Queue: Action combined for " << Item.URI << " and " << (*I)->URI << std::endl;
 861          (*I)->Owners.push_back(Item.Owner);
 862          Item.Owner->Status = (*I)->Owner->Status;
 863          return false;
 864       }
 865
 866    // Create a new item
 867    QItem *Itm = new QItem;
 868    *Itm = Item;
 869    Itm->Next = 0;
 870    *I = Itm;
 871
 872    Item.Owner->QueueCounter++;
 873    if (Items->Next == 0)
 874       Cycle();
 875    return true;
 876 }
 877                                                                         /*}}}*/
 878 // Queue::Dequeue - Remove an item from the queue                       /*{{{*/
 879 // ---------------------------------------------------------------------
 880 /* We return true if we hit something */
 881 bool pkgAcquire::Queue::Dequeue(Item *Owner)
 882 {
 883    if (Owner->Status == pkgAcquire::Item::StatFetching)
 884       return _error->Error("Tried to dequeue a fetching object");
 885
 886    bool Res = false;
 887
 888    QItem **I = &Items;
 889    for (; *I != 0;)
 890    {
 891       if (Owner == (*I)->Owner)
 892       {
 893          QItem *Jnk= *I;
 894          *I = (*I)->Next;
 895          Owner->QueueCounter--;
 896          delete Jnk;
 897          Res = true;
 898       }
 899       else
 900          I = &(*I)->Next;
 901    }
 902
 903    return Res;
 904 }
 905                                                                         /*}}}*/
 906 // Queue::Startup - Start the worker processes                          /*{{{*/
 907 // ---------------------------------------------------------------------
 908 /* It is possible for this to be called with a pre-existing set of
 909    workers. */
 910 bool pkgAcquire::Queue::Startup()
 911 {
 912    if (Workers == 0)
 913    {
 914       URI U(Name);
 915       pkgAcquire::MethodConfig *Cnf = Owner->GetConfig(U.Access);
 916       if (Cnf == 0)
 917          return false;
 918
 919       Workers = new Worker(this,Cnf,Owner->Log);
 920       Owner->Add(Workers);
 921       if (Workers->Start() == false)
 922          return false;
 923
 924       /* When pipelining we commit 10 items. This needs to change when we
 925          added other source retry to have cycle maintain a pipeline depth
 926          on its own. */
 927       if (Cnf->Pipeline == true)
 928          MaxPipeDepth = _config->FindI("Acquire::Max-Pipeline-Depth",10);
 929       else
 930          MaxPipeDepth = 1;
 931    }
 932
 933    return Cycle();
 934 }
 935                                                                         /*}}}*/
 936 // Queue::Shutdown - Shutdown the worker processes                      /*{{{*/
 937 // ---------------------------------------------------------------------
 938 /* If final is true then all workers are eliminated, otherwise only workers
 939    that do not need cleanup are removed */
 940 bool pkgAcquire::Queue::Shutdown(bool Final)
 941 {
 942    // Delete all of the workers
 943    pkgAcquire::Worker **Cur = &Workers;
 944    while (*Cur != 0)
 945    {
 946       pkgAcquire::Worker *Jnk = *Cur;
 947       if (Final == true || Jnk->GetConf()->NeedsCleanup == false)
 948       {
 949          *Cur = Jnk->NextQueue;
 950          Owner->Remove(Jnk);
 951          delete Jnk;
 952       }
 953       else
 954          Cur = &(*Cur)->NextQueue;
 955    }
 956
 957    return true;
 958 }
 959                                                                         /*}}}*/
 960 // Queue::FindItem - Find a URI in the item list                        /*{{{*/
 961 // ---------------------------------------------------------------------
 962 /* */
 963 pkgAcquire::Queue::QItem *pkgAcquire::Queue::FindItem(string URI,pkgAcquire::Worker *Owner)
 964 {
 965    for (QItem *I = Items; I != 0; I = I->Next)
 966       if (I->URI == URI && I->Worker == Owner)
 967          return I;
 968    return 0;
 969 }
 970                                                                         /*}}}*/
 971 // Queue::ItemDone - Item has been completed                            /*{{{*/
 972 // ---------------------------------------------------------------------
 973 /* The worker signals this which causes the item to be removed from the
 974    queue. If this is the last queue instance then it is removed from the
 975    main queue too.*/
 976 bool pkgAcquire::Queue::ItemDone(QItem *Itm)
 977 {
 978    PipeDepth--;
 979    for (QItem::owner_iterator O = Itm->Owners.begin(); O != Itm->Owners.end(); ++O)
 980    {
 981       if ((*O)->Status == pkgAcquire::Item::StatFetching)
 982          (*O)->Status = pkgAcquire::Item::StatDone;
 983    }
 984
 985    if (Itm->Owner->QueueCounter <= 1)
 986       Owner->Dequeue(Itm->Owner);
 987    else
 988    {
 989       Dequeue(Itm->Owner);
 990       Owner->Bump();
 991    }
 992
 993    return Cycle();
 994 }
 995                                                                         /*}}}*/
 996 // Queue::Cycle - Queue new items into the method                       /*{{{*/
 997 // ---------------------------------------------------------------------
 998 /* This locates a new idle item and sends it to the worker. If pipelining
 999    is enabled then it keeps the pipe full. */
1000 bool pkgAcquire::Queue::Cycle()
1001 {
1002    if (Items == 0 || Workers == 0)
1003       return true;
1004
1005    if (PipeDepth < 0)
1006       return _error->Error("Pipedepth failure");
1007
1008    // Look for a queable item
1009    QItem *I = Items;
1010    while (PipeDepth < (signed)MaxPipeDepth)
1011    {
1012       for (; I != 0; I = I->Next)
1013          if (I->Owner->Status == pkgAcquire::Item::StatIdle)
1014             break;
1015
1016       // Nothing to do, queue is idle.
1017       if (I == 0)
1018          return true;
1019
1020       I->Worker = Workers;
1021       for (auto const &O: I->Owners)
1022          O->Status = pkgAcquire::Item::StatFetching;
1023       PipeDepth++;
1024       if (Workers->QueueItem(I) == false)
1025          return false;
1026    }
1027
1028    return true;
1029 }
1030                                                                         /*}}}*/
1031 // Queue::Bump - Fetch any pending objects if we are idle               /*{{{*/
1032 // ---------------------------------------------------------------------
1033 /* This is called when an item in multiple queues is dequeued */
1034 void pkgAcquire::Queue::Bump()
1035 {
1036    Cycle();
1037 }
1038                                                                         /*}}}*/
1039 HashStringList pkgAcquire::Queue::QItem::GetExpectedHashes() const      /*{{{*/
1040 {
1041    /* each Item can have multiple owners and each owner might have different
1042       hashes, even if that is unlikely in practice and if so at least some
1043       owners will later fail. There is one situation through which is not a
1044       failure and still needs this handling: Two owners who expect the same
1045       file, but one owner only knows the SHA1 while the other only knows SHA256. */
1046    HashStringList superhsl;
1047    for (pkgAcquire::Queue::QItem::owner_iterator O = Owners.begin(); O != Owners.end(); ++O)
1048    {
1049       HashStringList const hsl = (*O)->GetExpectedHashes();
1050       if (hsl.usable() == false)
1051          continue;
1052       if (superhsl.usable() == false)
1053          superhsl = hsl;
1054       else
1055       {
1056          // we merge both lists - if we find disagreement send no hashes
1057          HashStringList::const_iterator hs = hsl.begin();
1058          for (; hs != hsl.end(); ++hs)
1059             if (superhsl.push_back(*hs) == false)
1060                break;
1061          if (hs != hsl.end())
1062          {
1063             superhsl.clear();
1064             break;
1065          }
1066       }
1067    }
1068    return superhsl;
1069 }
1070                                                                         /*}}}*/
1071 APT_PURE unsigned long long pkgAcquire::Queue::QItem::GetMaximumSize() const    /*{{{*/
1072 {
1073    unsigned long long Maximum = std::numeric_limits<unsigned long long>::max();
1074    for (auto const &O: Owners)
1075    {
1076       if (O->FileSize == 0)
1077          continue;
1078       Maximum = std::min(Maximum, O->FileSize);
1079    }
1080    if (Maximum == std::numeric_limits<unsigned long long>::max())
1081       return 0;
1082    return Maximum;
1083 }
1084                                                                         /*}}}*/
1085 void pkgAcquire::Queue::QItem::SyncDestinationFiles() const             /*{{{*/
1086 {
1087    /* ensure that the first owner has the best partial file of all and
1088       the rest have (potentially dangling) symlinks to it so that
1089       everything (like progress reporting) finds it easily */
1090    std::string superfile = Owner->DestFile;
1091    off_t supersize = 0;
1092    for (pkgAcquire::Queue::QItem::owner_iterator O = Owners.begin(); O != Owners.end(); ++O)
1093    {
1094       if ((*O)->DestFile == superfile)
1095          continue;
1096       struct stat file;
1097       if (lstat((*O)->DestFile.c_str(),&file) == 0)
1098       {
1099          if ((file.st_mode & S_IFREG) == 0)
1100             RemoveFile("SyncDestinationFiles", (*O)->DestFile);
1101          else if (supersize < file.st_size)
1102          {
1103             supersize = file.st_size;
1104             RemoveFile("SyncDestinationFiles", superfile);
1105             rename((*O)->DestFile.c_str(), superfile.c_str());
1106          }
1107          else
1108             RemoveFile("SyncDestinationFiles", (*O)->DestFile);
1109          if (symlink(superfile.c_str(), (*O)->DestFile.c_str()) != 0)
1110          {
1111             ; // not a problem per-se and no real alternative
1112          }
1113       }
1114    }
1115 }
1116                                                                         /*}}}*/
1117 std::string pkgAcquire::Queue::QItem::Custom600Headers() const          /*{{{*/
1118 {
1119    /* The others are relatively easy to merge, but this one?
1120       Lets not merge and see how far we can run with it…
1121       Likely, nobody will ever notice as all the items will
1122       be of the same class and hence generate the same headers. */
1123    return Owner->Custom600Headers();
1124 }
1125                                                                         /*}}}*/
1126
1127 // AcquireStatus::pkgAcquireStatus - Constructor                        /*{{{*/
1128 // ---------------------------------------------------------------------
1129 /* */
1130 pkgAcquireStatus::pkgAcquireStatus() : d(NULL), Percent(-1), Update(true), MorePulses(false)
1131 {
1132    Start();
1133 }
1134                                                                         /*}}}*/
1135 // AcquireStatus::Pulse - Called periodically                           /*{{{*/
1136 // ---------------------------------------------------------------------
1137 /* This computes some internal state variables for the derived classes to
1138    use. It generates the current downloaded bytes and total bytes to download
1139    as well as the current CPS estimate. */
1140 bool pkgAcquireStatus::Pulse(pkgAcquire *Owner)
1141 {
1142    TotalBytes = 0;
1143    CurrentBytes = 0;
1144    TotalItems = 0;
1145    CurrentItems = 0;
1146
1147    // Compute the total number of bytes to fetch
1148    unsigned int Unknown = 0;
1149    unsigned int Count = 0;
1150    bool ExpectAdditionalItems = false;
1151    for (pkgAcquire::ItemCIterator I = Owner->ItemsBegin();
1152         I != Owner->ItemsEnd();
1153         ++I, ++Count)
1154    {
1155       TotalItems++;
1156       if ((*I)->Status == pkgAcquire::Item::StatDone)
1157          ++CurrentItems;
1158
1159       // do we expect to acquire more files than we know of yet?
1160       if ((*I)->ExpectedAdditionalItems > 0)
1161          ExpectAdditionalItems = true;
1162
1163       TotalBytes += (*I)->FileSize;
1164       if ((*I)->Complete == true)
1165          CurrentBytes += (*I)->FileSize;
1166       if ((*I)->FileSize == 0 && (*I)->Complete == false)
1167          ++Unknown;
1168    }
1169
1170    // Compute the current completion
1171    unsigned long long ResumeSize = 0;
1172    for (pkgAcquire::Worker *I = Owner->WorkersBegin(); I != 0;
1173         I = Owner->WorkerStep(I))
1174    {
1175       if (I->CurrentItem != 0 && I->CurrentItem->Owner->Complete == false)
1176       {
1177          CurrentBytes += I->CurrentSize;
1178          ResumeSize += I->ResumePoint;
1179
1180          // Files with unknown size always have 100% completion
1181          if (I->CurrentItem->Owner->FileSize == 0 &&
1182              I->CurrentItem->Owner->Complete == false)
1183             TotalBytes += I->CurrentSize;
1184       }
1185    }
1186
1187    // Normalize the figures and account for unknown size downloads
1188    if (TotalBytes <= 0)
1189       TotalBytes = 1;
1190    if (Unknown == Count)
1191       TotalBytes = Unknown;
1192
1193    // Wha?! Is not supposed to happen.
1194    if (CurrentBytes > TotalBytes)
1195       CurrentBytes = TotalBytes;
1196
1197    // Compute the CPS
1198    struct timeval NewTime;
1199    gettimeofday(&NewTime,0);
1200    if ((NewTime.tv_sec - Time.tv_sec == 6 && NewTime.tv_usec > Time.tv_usec) ||
1201        NewTime.tv_sec - Time.tv_sec > 6)
1202    {
1203       double Delta = NewTime.tv_sec - Time.tv_sec +
1204                      (NewTime.tv_usec - Time.tv_usec)/1000000.0;
1205
1206       // Compute the CPS value
1207       if (Delta < 0.01)
1208          CurrentCPS = 0;
1209       else
1210          CurrentCPS = ((CurrentBytes - ResumeSize) - LastBytes)/Delta;
1211       LastBytes = CurrentBytes - ResumeSize;
1212       ElapsedTime = (unsigned long long)Delta;
1213       Time = NewTime;
1214    }
1215
1216    double const OldPercent = Percent;
1217    // calculate the percentage, if we have too little data assume 1%
1218    if (ExpectAdditionalItems)
1219       Percent = 0;
1220    else
1221       // use both files and bytes because bytes can be unreliable
1222       Percent = (0.8 * (CurrentBytes/float(TotalBytes)*100.0) +
1223                  0.2 * (CurrentItems/float(TotalItems)*100.0));
1224
1225    // debug
1226    if (_config->FindB("Debug::acquire::progress", false) == true)
1227    {
1228       std::clog
1229          << "["
1230          << std::setw(5) << std::setprecision(4) << std::showpoint << Percent
1231          << "]"
1232          << " Bytes: "
1233          << SizeToStr(CurrentBytes) << " / " << SizeToStr(TotalBytes)
1234          << " # Files: "
1235          << CurrentItems << " / " << TotalItems
1236          << std::endl;
1237    }
1238
1239    double const DiffPercent = Percent - OldPercent;
1240    if (DiffPercent < 0.001 && _config->FindB("Acquire::Progress::Diffpercent", false) == true)
1241       return true;
1242
1243    int fd = _config->FindI("APT::Status-Fd",-1);
1244    if(fd > 0)
1245    {
1246       ostringstream status;
1247
1248       char msg[200];
1249       long i = CurrentItems < TotalItems ? CurrentItems + 1 : CurrentItems;
1250       unsigned long long ETA = 0;
1251       if(CurrentCPS > 0)
1252          ETA = (TotalBytes - CurrentBytes) / CurrentCPS;
1253
1254       // only show the ETA if it makes sense
1255       if (ETA > 0 && ETA < 172800 /* two days */ )
1256          snprintf(msg,sizeof(msg), _("Retrieving file %li of %li (%s remaining)"), i, TotalItems, TimeToStr(ETA).c_str());
1257       else
1258          snprintf(msg,sizeof(msg), _("Retrieving file %li of %li"), i, TotalItems);
1259
1260       // build the status str
1261       std::ostringstream str;
1262       str.imbue(std::locale::classic());
1263       str.precision(4);
1264       str << "dlstatus" << ':' << std::fixed << i << ':' << Percent << ':' << msg << '\n';
1265       auto const dlstatus = str.str();
1266       FileFd::Write(fd, dlstatus.data(), dlstatus.size());
1267    }
1268
1269    return true;
1270 }
1271                                                                         /*}}}*/
1272 // AcquireStatus::Start - Called when the download is started           /*{{{*/
1273 // ---------------------------------------------------------------------
1274 /* We just reset the counters */
1275 void pkgAcquireStatus::Start()
1276 {
1277    gettimeofday(&Time,0);
1278    gettimeofday(&StartTime,0);
1279    LastBytes = 0;
1280    CurrentCPS = 0;
1281    CurrentBytes = 0;
1282    TotalBytes = 0;
1283    FetchedBytes = 0;
1284    ElapsedTime = 0;
1285    TotalItems = 0;
1286    CurrentItems = 0;
1287 }
1288                                                                         /*}}}*/
1289 // AcquireStatus::Stop - Finished downloading                           /*{{{*/
1290 // ---------------------------------------------------------------------
1291 /* This accurately computes the elapsed time and the total overall CPS. */
1292 void pkgAcquireStatus::Stop()
1293 {
1294    // Compute the CPS and elapsed time
1295    struct timeval NewTime;
1296    gettimeofday(&NewTime,0);
1297
1298    double Delta = NewTime.tv_sec - StartTime.tv_sec +
1299                   (NewTime.tv_usec - StartTime.tv_usec)/1000000.0;
1300
1301    // Compute the CPS value
1302    if (Delta < 0.01)
1303       CurrentCPS = 0;
1304    else
1305       CurrentCPS = FetchedBytes/Delta;
1306    LastBytes = CurrentBytes;
1307    ElapsedTime = (unsigned long long)Delta;
1308 }
1309                                                                         /*}}}*/
1310 // AcquireStatus::Fetched - Called when a byte set has been fetched     /*{{{*/
1311 // ---------------------------------------------------------------------
1312 /* This is used to get accurate final transfer rate reporting. */
1313 void pkgAcquireStatus::Fetched(unsigned long long Size,unsigned long long Resume)
1314 {
1315    FetchedBytes += Size - Resume;
1316 }
1317                                                                         /*}}}*/
1318
1319 pkgAcquire::UriIterator::UriIterator(pkgAcquire::Queue *Q) : d(NULL), CurQ(Q), CurItem(0)
1320 {
1321    while (CurItem == 0 && CurQ != 0)
1322    {
1323       CurItem = CurQ->Items;
1324       CurQ = CurQ->Next;
1325    }
1326 }
1327
1328 APT_CONST pkgAcquire::UriIterator::~UriIterator() {}
1329 APT_CONST pkgAcquire::MethodConfig::~MethodConfig() {}
1330 APT_CONST pkgAcquireStatus::~pkgAcquireStatus() {}