apt-pkg/deb/dpkgpm.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: dpkgpm.cc,v 1.28 2004/01/27 02:25:01 mdz Exp $
   4 /* ######################################################################
   5
   6    DPKG Package Manager - Provide an interface to dpkg
   7
   8    ##################################################################### */
   9                                                                         /*}}}*/
  10 // Includes                                                             /*{{{*/
  11 #include <config.h>
  12
  13 #include <apt-pkg/cachefile.h>
  14 #include <apt-pkg/configuration.h>
  15 #include <apt-pkg/depcache.h>
  16 #include <apt-pkg/dpkgpm.h>
  17 #include <apt-pkg/error.h>
  18 #include <apt-pkg/fileutl.h>
  19 #include <apt-pkg/install-progress.h>
  20 #include <apt-pkg/packagemanager.h>
  21 #include <apt-pkg/pkgrecords.h>
  22 #include <apt-pkg/strutl.h>
  23 #include <apt-pkg/cacheiterators.h>
  24 #include <apt-pkg/macros.h>
  25 #include <apt-pkg/pkgcache.h>
  26
  27 #include <errno.h>
  28 #include <fcntl.h>
  29 #include <grp.h>
  30 #include <pty.h>
  31 #include <pwd.h>
  32 #include <signal.h>
  33 #include <stddef.h>
  34 #include <stdio.h>
  35 #include <stdlib.h>
  36 #include <sys/ioctl.h>
  37 #include <sys/select.h>
  38 #include <sys/stat.h>
  39 #include <sys/time.h>
  40 #include <sys/wait.h>
  41 #include <termios.h>
  42 #include <time.h>
  43 #include <unistd.h>
  44 #include <algorithm>
  45 #include <cstring>
  46 #include <iostream>
  47 #include <map>
  48 #include <set>
  49 #include <string>
  50 #include <utility>
  51 #include <vector>
  52
  53 #include <apti18n.h>
  54                                                                         /*}}}*/
  55
  56 using namespace std;
  57
  58 class pkgDPkgPMPrivate
  59 {
  60 public:
  61    pkgDPkgPMPrivate() : stdin_is_dev_null(false), dpkgbuf_pos(0),
  62                         term_out(NULL), history_out(NULL),
  63                         progress(NULL), master(-1), slave(-1)
  64    {
  65       dpkgbuf[0] = '\0';
  66    }
  67    ~pkgDPkgPMPrivate()
  68    {
  69    }
  70    bool stdin_is_dev_null;
  71    // the buffer we use for the dpkg status-fd reading
  72    char dpkgbuf[1024];
  73    int dpkgbuf_pos;
  74    FILE *term_out;
  75    FILE *history_out;
  76    string dpkg_error;
  77    APT::Progress::PackageManager *progress;
  78
  79    // pty stuff
  80    struct       termios tt;
  81    int master;
  82    int slave;
  83
  84    // signals
  85    sigset_t sigmask;
  86    sigset_t original_sigmask;
  87
  88 };
  89
  90 namespace
  91 {
  92   // Maps the dpkg "processing" info to human readable names.  Entry 0
  93   // of each array is the key, entry 1 is the value.
  94   const std::pair<const char *, const char *> PackageProcessingOps[] = {
  95     std::make_pair("install",   N_("Installing %s")),
  96     std::make_pair("configure", N_("Configuring %s")),
  97     std::make_pair("remove",    N_("Removing %s")),
  98     std::make_pair("purge",    N_("Completely removing %s")),
  99     std::make_pair("disappear", N_("Noting disappearance of %s")),
 100     std::make_pair("trigproc",  N_("Running post-installation trigger %s"))
 101   };
 102
 103   const std::pair<const char *, const char *> * const PackageProcessingOpsBegin = PackageProcessingOps;
 104   const std::pair<const char *, const char *> * const PackageProcessingOpsEnd   = PackageProcessingOps + sizeof(PackageProcessingOps) / sizeof(PackageProcessingOps[0]);
 105
 106   // Predicate to test whether an entry in the PackageProcessingOps
 107   // array matches a string.
 108   class MatchProcessingOp
 109   {
 110     const char *target;
 111
 112   public:
 113     MatchProcessingOp(const char *the_target)
 114       : target(the_target)
 115     {
 116     }
 117
 118     bool operator()(const std::pair<const char *, const char *> &pair) const
 119     {
 120       return strcmp(pair.first, target) == 0;
 121     }
 122   };
 123 }
 124
 125 /* helper function to ionice the given PID
 126
 127  there is no C header for ionice yet - just the syscall interface
 128  so we use the binary from util-linux
 129 */
 130 static bool
 131 ionice(int PID)
 132 {
 133    if (!FileExists("/usr/bin/ionice"))
 134       return false;
 135    pid_t Process = ExecFork();
 136    if (Process == 0)
 137    {
 138       char buf[32];
 139       snprintf(buf, sizeof(buf), "-p%d", PID);
 140       const char *Args[4];
 141       Args[0] = "/usr/bin/ionice";
 142       Args[1] = "-c3";
 143       Args[2] = buf;
 144       Args[3] = 0;
 145       execv(Args[0], (char **)Args);
 146    }
 147    return ExecWait(Process, "ionice");
 148 }
 149
 150 static std::string getDpkgExecutable()
 151 {
 152    string Tmp = _config->Find("Dir::Bin::dpkg","dpkg");
 153    string const dpkgChrootDir = _config->FindDir("DPkg::Chroot-Directory", "/");
 154    size_t dpkgChrootLen = dpkgChrootDir.length();
 155    if (dpkgChrootDir != "/" && Tmp.find(dpkgChrootDir) == 0)
 156    {
 157       if (dpkgChrootDir[dpkgChrootLen - 1] == '/')
 158          --dpkgChrootLen;
 159       Tmp = Tmp.substr(dpkgChrootLen);
 160    }
 161    return Tmp;
 162 }
 163
 164 // dpkgChrootDirectory - chrooting for dpkg if needed                   /*{{{*/
 165 static void dpkgChrootDirectory()
 166 {
 167    std::string const chrootDir = _config->FindDir("DPkg::Chroot-Directory");
 168    if (chrootDir == "/")
 169       return;
 170    std::cerr << "Chrooting into " << chrootDir << std::endl;
 171    if (chroot(chrootDir.c_str()) != 0)
 172       _exit(100);
 173    if (chdir("/") != 0)
 174       _exit(100);
 175 }
 176                                                                         /*}}}*/
 177
 178
 179 // FindNowVersion - Helper to find a Version in "now" state     /*{{{*/
 180 // ---------------------------------------------------------------------
 181 /* This is helpful when a package is no longer installed but has residual
 182  * config files
 183  */
 184 static
 185 pkgCache::VerIterator FindNowVersion(const pkgCache::PkgIterator &Pkg)
 186 {
 187    pkgCache::VerIterator Ver;
 188    for (Ver = Pkg.VersionList(); Ver.end() == false; ++Ver)
 189    {
 190       pkgCache::VerFileIterator Vf = Ver.FileList();
 191       pkgCache::PkgFileIterator F = Vf.File();
 192       for (F = Vf.File(); F.end() == false; ++F)
 193       {
 194          if (F && F.Archive())
 195          {
 196             if (strcmp(F.Archive(), "now"))
 197                return Ver;
 198          }
 199       }
 200    }
 201    return Ver;
 202 }
 203                                                                         /*}}}*/
 204
 205 // DPkgPM::pkgDPkgPM - Constructor                                      /*{{{*/
 206 // ---------------------------------------------------------------------
 207 /* */
 208 pkgDPkgPM::pkgDPkgPM(pkgDepCache *Cache)
 209    : pkgPackageManager(Cache), pkgFailures(0), PackagesDone(0), PackagesTotal(0)
 210 {
 211    d = new pkgDPkgPMPrivate();
 212 }
 213                                                                         /*}}}*/
 214 // DPkgPM::pkgDPkgPM - Destructor                                       /*{{{*/
 215 // ---------------------------------------------------------------------
 216 /* */
 217 pkgDPkgPM::~pkgDPkgPM()
 218 {
 219    delete d;
 220 }
 221                                                                         /*}}}*/
 222 // DPkgPM::Install - Install a package                                  /*{{{*/
 223 // ---------------------------------------------------------------------
 224 /* Add an install operation to the sequence list */
 225 bool pkgDPkgPM::Install(PkgIterator Pkg,string File)
 226 {
 227    if (File.empty() == true || Pkg.end() == true)
 228       return _error->Error("Internal Error, No file name for %s",Pkg.FullName().c_str());
 229
 230    // If the filename string begins with DPkg::Chroot-Directory, return the
 231    // substr that is within the chroot so dpkg can access it.
 232    string const chrootdir = _config->FindDir("DPkg::Chroot-Directory","/");
 233    if (chrootdir != "/" && File.find(chrootdir) == 0)
 234    {
 235       size_t len = chrootdir.length();
 236       if (chrootdir.at(len - 1) == '/')
 237         len--;
 238       List.push_back(Item(Item::Install,Pkg,File.substr(len)));
 239    }
 240    else
 241       List.push_back(Item(Item::Install,Pkg,File));
 242
 243    return true;
 244 }
 245                                                                         /*}}}*/
 246 // DPkgPM::Configure - Configure a package                              /*{{{*/
 247 // ---------------------------------------------------------------------
 248 /* Add a configure operation to the sequence list */
 249 bool pkgDPkgPM::Configure(PkgIterator Pkg)
 250 {
 251    if (Pkg.end() == true)
 252       return false;
 253
 254    List.push_back(Item(Item::Configure, Pkg));
 255
 256    // Use triggers for config calls if we configure "smart"
 257    // as otherwise Pre-Depends will not be satisfied, see #526774
 258    if (_config->FindB("DPkg::TriggersPending", false) == true)
 259       List.push_back(Item(Item::TriggersPending, PkgIterator()));
 260
 261    return true;
 262 }
 263                                                                         /*}}}*/
 264 // DPkgPM::Remove - Remove a package                                    /*{{{*/
 265 // ---------------------------------------------------------------------
 266 /* Add a remove operation to the sequence list */
 267 bool pkgDPkgPM::Remove(PkgIterator Pkg,bool Purge)
 268 {
 269    if (Pkg.end() == true)
 270       return false;
 271
 272    if (Purge == true)
 273       List.push_back(Item(Item::Purge,Pkg));
 274    else
 275       List.push_back(Item(Item::Remove,Pkg));
 276    return true;
 277 }
 278                                                                         /*}}}*/
 279 // DPkgPM::SendPkgInfo - Send info for install-pkgs hook                /*{{{*/
 280 // ---------------------------------------------------------------------
 281 /* This is part of the helper script communication interface, it sends
 282    very complete information down to the other end of the pipe.*/
 283 bool pkgDPkgPM::SendV2Pkgs(FILE *F)
 284 {
 285    return SendPkgsInfo(F, 2);
 286 }
 287 bool pkgDPkgPM::SendPkgsInfo(FILE * const F, unsigned int const &Version)
 288 {
 289    // This version of APT supports only v3, so don't sent higher versions
 290    if (Version <= 3)
 291       fprintf(F,"VERSION %u\n", Version);
 292    else
 293       fprintf(F,"VERSION 3\n");
 294
 295    /* Write out all of the configuration directives by walking the
 296       configuration tree */
 297    const Configuration::Item *Top = _config->Tree(0);
 298    for (; Top != 0;)
 299    {
 300       if (Top->Value.empty() == false)
 301       {
 302          fprintf(F,"%s=%s\n",
 303                  QuoteString(Top->FullTag(),"=\"\n").c_str(),
 304                  QuoteString(Top->Value,"\n").c_str());
 305       }
 306
 307       if (Top->Child != 0)
 308       {
 309          Top = Top->Child;
 310          continue;
 311       }
 312
 313       while (Top != 0 && Top->Next == 0)
 314          Top = Top->Parent;
 315       if (Top != 0)
 316          Top = Top->Next;
 317    }
 318    fprintf(F,"\n");
 319
 320    // Write out the package actions in order.
 321    for (vector<Item>::iterator I = List.begin(); I != List.end(); ++I)
 322    {
 323       if(I->Pkg.end() == true)
 324          continue;
 325
 326       pkgDepCache::StateCache &S = Cache[I->Pkg];
 327
 328       fprintf(F,"%s ",I->Pkg.Name());
 329
 330       // Current version which we are going to replace
 331       pkgCache::VerIterator CurVer = I->Pkg.CurrentVer();
 332       if (CurVer.end() == true && (I->Op == Item::Remove || I->Op == Item::Purge))
 333          CurVer = FindNowVersion(I->Pkg);
 334
 335       if (CurVer.end() == true)
 336       {
 337          if (Version <= 2)
 338             fprintf(F, "- ");
 339          else
 340             fprintf(F, "- - none ");
 341       }
 342       else
 343       {
 344          fprintf(F, "%s ", CurVer.VerStr());
 345          if (Version >= 3)
 346             fprintf(F, "%s %s ", CurVer.Arch(), CurVer.MultiArchType());
 347       }
 348
 349       // Show the compare operator between current and install version
 350       if (S.InstallVer != 0)
 351       {
 352          pkgCache::VerIterator const InstVer = S.InstVerIter(Cache);
 353          int Comp = 2;
 354          if (CurVer.end() == false)
 355             Comp = InstVer.CompareVer(CurVer);
 356          if (Comp < 0)
 357             fprintf(F,"> ");
 358          else if (Comp == 0)
 359             fprintf(F,"= ");
 360          else if (Comp > 0)
 361             fprintf(F,"< ");
 362          fprintf(F, "%s ", InstVer.VerStr());
 363          if (Version >= 3)
 364             fprintf(F, "%s %s ", InstVer.Arch(), InstVer.MultiArchType());
 365       }
 366       else
 367       {
 368          if (Version <= 2)
 369             fprintf(F, "> - ");
 370          else
 371             fprintf(F, "> - - none ");
 372       }
 373
 374       // Show the filename/operation
 375       if (I->Op == Item::Install)
 376       {
 377          // No errors here..
 378          if (I->File[0] != '/')
 379             fprintf(F,"**ERROR**\n");
 380          else
 381             fprintf(F,"%s\n",I->File.c_str());
 382       }
 383       else if (I->Op == Item::Configure)
 384          fprintf(F,"**CONFIGURE**\n");
 385       else if (I->Op == Item::Remove ||
 386           I->Op == Item::Purge)
 387          fprintf(F,"**REMOVE**\n");
 388
 389       if (ferror(F) != 0)
 390          return false;
 391    }
 392    return true;
 393 }
 394                                                                         /*}}}*/
 395 // DPkgPM::RunScriptsWithPkgs - Run scripts with package names on stdin /*{{{*/
 396 // ---------------------------------------------------------------------
 397 /* This looks for a list of scripts to run from the configuration file
 398    each one is run and is fed on standard input a list of all .deb files
 399    that are due to be installed. */
 400 bool pkgDPkgPM::RunScriptsWithPkgs(const char *Cnf)
 401 {
 402    bool result = true;
 403
 404    Configuration::Item const *Opts = _config->Tree(Cnf);
 405    if (Opts == 0 || Opts->Child == 0)
 406       return true;
 407    Opts = Opts->Child;
 408
 409    sighandler_t old_sigpipe = signal(SIGPIPE, SIG_IGN);
 410
 411    unsigned int Count = 1;
 412    for (; Opts != 0; Opts = Opts->Next, Count++)
 413    {
 414       if (Opts->Value.empty() == true)
 415          continue;
 416
 417       if(_config->FindB("Debug::RunScripts", false) == true)
 418          std::clog << "Running external script with list of all .deb file: '"
 419                    << Opts->Value << "'" << std::endl;
 420
 421       // Determine the protocol version
 422       string OptSec = Opts->Value;
 423       string::size_type Pos;
 424       if ((Pos = OptSec.find(' ')) == string::npos || Pos == 0)
 425          Pos = OptSec.length();
 426       OptSec = "DPkg::Tools::Options::" + string(Opts->Value.c_str(),Pos);
 427
 428       unsigned int Version = _config->FindI(OptSec+"::Version",1);
 429       unsigned int InfoFD = _config->FindI(OptSec + "::InfoFD", STDIN_FILENO);
 430
 431       // Create the pipes
 432       std::set<int> KeepFDs;
 433       MergeKeepFdsFromConfiguration(KeepFDs);
 434       int Pipes[2];
 435       if (pipe(Pipes) != 0) {
 436          result = _error->Errno("pipe","Failed to create IPC pipe to subprocess");
 437          break;
 438       }
 439       if (InfoFD != (unsigned)Pipes[0])
 440          SetCloseExec(Pipes[0],true);
 441       else
 442          KeepFDs.insert(Pipes[0]);
 443
 444
 445       SetCloseExec(Pipes[1],true);
 446
 447       // Purified Fork for running the script
 448       pid_t Process = ExecFork(KeepFDs);
 449       if (Process == 0)
 450       {
 451          // Setup the FDs
 452          dup2(Pipes[0], InfoFD);
 453          SetCloseExec(STDOUT_FILENO,false);
 454          SetCloseExec(STDIN_FILENO,false);
 455          SetCloseExec(STDERR_FILENO,false);
 456
 457          string hookfd;
 458          strprintf(hookfd, "%d", InfoFD);
 459          setenv("APT_HOOK_INFO_FD", hookfd.c_str(), 1);
 460
 461          dpkgChrootDirectory();
 462          const char *Args[4];
 463          Args[0] = "/bin/sh";
 464          Args[1] = "-c";
 465          Args[2] = Opts->Value.c_str();
 466          Args[3] = 0;
 467          execv(Args[0],(char **)Args);
 468          _exit(100);
 469       }
 470       close(Pipes[0]);
 471       FILE *F = fdopen(Pipes[1],"w");
 472       if (F == 0) {
 473          result = _error->Errno("fdopen","Faild to open new FD");
 474          break;
 475       }
 476
 477       // Feed it the filenames.
 478       if (Version <= 1)
 479       {
 480          for (vector<Item>::iterator I = List.begin(); I != List.end(); ++I)
 481          {
 482             // Only deal with packages to be installed from .deb
 483             if (I->Op != Item::Install)
 484                continue;
 485
 486             // No errors here..
 487             if (I->File[0] != '/')
 488                continue;
 489
 490             /* Feed the filename of each package that is pending install
 491                into the pipe. */
 492             fprintf(F,"%s\n",I->File.c_str());
 493             if (ferror(F) != 0)
 494                break;
 495          }
 496       }
 497       else
 498          SendPkgsInfo(F, Version);
 499
 500       fclose(F);
 501
 502       // Clean up the sub process
 503       if (ExecWait(Process,Opts->Value.c_str()) == false) {
 504          result = _error->Error("Failure running script %s",Opts->Value.c_str());
 505          break;
 506       }
 507    }
 508    signal(SIGPIPE, old_sigpipe);
 509
 510    return result;
 511 }
 512                                                                         /*}}}*/
 513 // DPkgPM::DoStdin - Read stdin and pass to slave pty                   /*{{{*/
 514 // ---------------------------------------------------------------------
 515 /*
 516 */
 517 void pkgDPkgPM::DoStdin(int master)
 518 {
 519    unsigned char input_buf[256] = {0,};
 520    ssize_t len = read(0, input_buf, sizeof(input_buf));
 521    if (len)
 522       FileFd::Write(master, input_buf, len);
 523    else
 524       d->stdin_is_dev_null = true;
 525 }
 526                                                                         /*}}}*/
 527 // DPkgPM::DoTerminalPty - Read the terminal pty and write log          /*{{{*/
 528 // ---------------------------------------------------------------------
 529 /*
 530  * read the terminal pty and write log
 531  */
 532 void pkgDPkgPM::DoTerminalPty(int master)
 533 {
 534    unsigned char term_buf[1024] = {0,0, };
 535
 536    ssize_t len=read(master, term_buf, sizeof(term_buf));
 537    if(len == -1 && errno == EIO)
 538    {
 539       // this happens when the child is about to exit, we
 540       // give it time to actually exit, otherwise we run
 541       // into a race so we sleep for half a second.
 542       struct timespec sleepfor = { 0, 500000000 };
 543       nanosleep(&sleepfor, NULL);
 544       return;
 545    }
 546    if(len <= 0)
 547       return;
 548    FileFd::Write(1, term_buf, len);
 549    if(d->term_out)
 550       fwrite(term_buf, len, sizeof(char), d->term_out);
 551 }
 552                                                                         /*}}}*/
 553 // DPkgPM::ProcessDpkgStatusBuf                                         /*{{{*/
 554 // ---------------------------------------------------------------------
 555 /*
 556  */
 557 void pkgDPkgPM::ProcessDpkgStatusLine(char *line)
 558 {
 559    bool const Debug = _config->FindB("Debug::pkgDPkgProgressReporting",false);
 560    if (Debug == true)
 561       std::clog << "got from dpkg '" << line << "'" << std::endl;
 562
 563    /* dpkg sends strings like this:
 564       'status:   <pkg>: <pkg  qstate>'
 565       'status:   <pkg>:<arch>: <pkg  qstate>'
 566
 567       'processing: {install,configure,remove,purge,disappear,trigproc}: pkg'
 568       'processing: {install,configure,remove,purge,disappear,trigproc}: trigger'
 569    */
 570
 571    // we need to split on ": " (note the appended space) as the ':' is
 572    // part of the pkgname:arch information that dpkg sends
 573    //
 574    // A dpkg error message may contain additional ":" (like
 575    //  "failed in buffer_write(fd) (10, ret=-1): backend dpkg-deb ..."
 576    // so we need to ensure to not split too much
 577    std::vector<std::string> list = StringSplit(line, ": ", 4);
 578    if(list.size() < 3)
 579    {
 580       if (Debug == true)
 581          std::clog << "ignoring line: not enough ':'" << std::endl;
 582       return;
 583    }
 584
 585    // build the (prefix, pkgname, action) tuple, position of this
 586    // is different for "processing" or "status" messages
 587    std::string prefix = APT::String::Strip(list[0]);
 588    std::string pkgname;
 589    std::string action;
 590
 591    // "processing" has the form "processing: action: pkg or trigger"
 592    // with action = ["install", "configure", "remove", "purge", "disappear",
 593    //                "trigproc"]
 594    if (prefix == "processing")
 595    {
 596       pkgname = APT::String::Strip(list[2]);
 597       action = APT::String::Strip(list[1]);
 598    }
 599    // "status" has the form: "status: pkg: state"
 600    // with state in ["half-installed", "unpacked", "half-configured",
 601    //                "installed", "config-files", "not-installed"]
 602    else if (prefix == "status")
 603    {
 604       pkgname = APT::String::Strip(list[1]);
 605       action = APT::String::Strip(list[2]);
 606    } else {
 607       if (Debug == true)
 608          std::clog << "unknown prefix '" << prefix << "'" << std::endl;
 609       return;
 610    }
 611
 612
 613    /* handle the special cases first:
 614
 615       errors look like this:
 616       'status: /var/cache/apt/archives/krecipes_0.8.1-0ubuntu1_i386.deb : error : trying to overwrite `/usr/share/doc/kde/HTML/en/krecipes/krectip.png', which is also in package krecipes-data
 617       and conffile-prompt like this
 618       'status:/etc/compiz.conf/compiz.conf :  conffile-prompt: 'current-conffile' 'new-conffile' useredited distedited
 619    */
 620    if (prefix == "status")
 621    {
 622       if(action == "error")
 623       {
 624          d->progress->Error(list[1], PackagesDone, PackagesTotal,
 625                             list[3]);
 626          pkgFailures++;
 627          WriteApportReport(list[1].c_str(), list[3].c_str());
 628          return;
 629       }
 630       else if(action == "conffile-prompt")
 631       {
 632          d->progress->ConffilePrompt(list[1], PackagesDone, PackagesTotal,
 633                                      list[3]);
 634          return;
 635       }
 636    }
 637
 638    // at this point we know that we should have a valid pkgname, so build all
 639    // the info from it
 640
 641    // dpkg does not send always send "pkgname:arch" so we add it here
 642    // if needed
 643    if (pkgname.find(":") == std::string::npos)
 644    {
 645       // find the package in the group that is in a touched by dpkg
 646       // if there are multiple dpkg will send us a full pkgname:arch
 647       pkgCache::GrpIterator Grp = Cache.FindGrp(pkgname);
 648       if (Grp.end() == false)
 649       {
 650           pkgCache::PkgIterator P = Grp.PackageList();
 651           for (; P.end() != true; P = Grp.NextPkg(P))
 652           {
 653               if(Cache[P].Mode != pkgDepCache::ModeKeep)
 654               {
 655                   pkgname = P.FullName();
 656                   break;
 657               }
 658           }
 659       }
 660    }
 661
 662    const char* const pkg = pkgname.c_str();
 663    std::string short_pkgname = StringSplit(pkgname, ":")[0];
 664    std::string arch = "";
 665    if (pkgname.find(":") != string::npos)
 666       arch = StringSplit(pkgname, ":")[1];
 667    std::string i18n_pkgname = pkgname;
 668    if (arch.size() != 0)
 669       strprintf(i18n_pkgname, "%s (%s)", short_pkgname.c_str(), arch.c_str());
 670
 671    // 'processing' from dpkg looks like
 672    // 'processing: action: pkg'
 673    if(prefix == "processing")
 674    {
 675       const std::pair<const char *, const char *> * const iter =
 676         std::find_if(PackageProcessingOpsBegin,
 677                      PackageProcessingOpsEnd,
 678                      MatchProcessingOp(action.c_str()));
 679       if(iter == PackageProcessingOpsEnd)
 680       {
 681          if (Debug == true)
 682             std::clog << "ignoring unknown action: " << action << std::endl;
 683          return;
 684       }
 685       std::string msg;
 686       strprintf(msg, _(iter->second), i18n_pkgname.c_str());
 687       d->progress->StatusChanged(pkgname, PackagesDone, PackagesTotal, msg);
 688
 689       // FIXME: this needs a muliarch testcase
 690       // FIXME2: is "pkgname" here reliable with dpkg only sending us
 691       //         short pkgnames?
 692       if (action == "disappear")
 693          handleDisappearAction(pkgname);
 694       return;
 695    }
 696
 697    if (prefix == "status")
 698    {
 699       vector<struct DpkgState> const &states = PackageOps[pkg];
 700       const char *next_action = NULL;
 701       if(PackageOpsDone[pkg] < states.size())
 702          next_action = states[PackageOpsDone[pkg]].state;
 703       // check if the package moved to the next dpkg state
 704       if(next_action && (action == next_action))
 705       {
 706          // only read the translation if there is actually a next
 707          // action
 708          const char *translation = _(states[PackageOpsDone[pkg]].str);
 709          std::string msg;
 710
 711          // we moved from one dpkg state to a new one, report that
 712          PackageOpsDone[pkg]++;
 713          PackagesDone++;
 714
 715          strprintf(msg, translation, i18n_pkgname.c_str());
 716          d->progress->StatusChanged(pkgname, PackagesDone, PackagesTotal, msg);
 717
 718       }
 719       if (Debug == true)
 720          std::clog << "(parsed from dpkg) pkg: " << short_pkgname
 721                    << " action: " << action << endl;
 722    }
 723 }
 724                                                                         /*}}}*/
 725 // DPkgPM::handleDisappearAction                                        /*{{{*/
 726 void pkgDPkgPM::handleDisappearAction(string const &pkgname)
 727 {
 728    pkgCache::PkgIterator Pkg = Cache.FindPkg(pkgname);
 729    if (unlikely(Pkg.end() == true))
 730       return;
 731
 732    // record the package name for display and stuff later
 733    disappearedPkgs.insert(Pkg.FullName(true));
 734
 735    // the disappeared package was auto-installed - nothing to do
 736    if ((Cache[Pkg].Flags & pkgCache::Flag::Auto) == pkgCache::Flag::Auto)
 737       return;
 738    pkgCache::VerIterator PkgVer = Cache[Pkg].InstVerIter(Cache);
 739    if (unlikely(PkgVer.end() == true))
 740       return;
 741    /* search in the list of dependencies for (Pre)Depends,
 742       check if this dependency has a Replaces on our package
 743       and if so transfer the manual installed flag to it */
 744    for (pkgCache::DepIterator Dep = PkgVer.DependsList(); Dep.end() != true; ++Dep)
 745    {
 746       if (Dep->Type != pkgCache::Dep::Depends &&
 747           Dep->Type != pkgCache::Dep::PreDepends)
 748          continue;
 749       pkgCache::PkgIterator Tar = Dep.TargetPkg();
 750       if (unlikely(Tar.end() == true))
 751          continue;
 752       // the package is already marked as manual
 753       if ((Cache[Tar].Flags & pkgCache::Flag::Auto) != pkgCache::Flag::Auto)
 754          continue;
 755       pkgCache::VerIterator TarVer =  Cache[Tar].InstVerIter(Cache);
 756       if (TarVer.end() == true)
 757          continue;
 758       for (pkgCache::DepIterator Rep = TarVer.DependsList(); Rep.end() != true; ++Rep)
 759       {
 760          if (Rep->Type != pkgCache::Dep::Replaces)
 761             continue;
 762          if (Pkg != Rep.TargetPkg())
 763             continue;
 764          // okay, they are strongly connected - transfer manual-bit
 765          if (Debug == true)
 766             std::clog << "transfer manual-bit from disappeared »" << pkgname << "« to »" << Tar.FullName() << "«" << std::endl;
 767          Cache[Tar].Flags &= ~Flag::Auto;
 768          break;
 769       }
 770    }
 771 }
 772                                                                         /*}}}*/
 773 // DPkgPM::DoDpkgStatusFd                                               /*{{{*/
 774 // ---------------------------------------------------------------------
 775 /*
 776  */
 777 void pkgDPkgPM::DoDpkgStatusFd(int statusfd)
 778 {
 779    char *p, *q;
 780    int len;
 781
 782    len=read(statusfd, &d->dpkgbuf[d->dpkgbuf_pos], sizeof(d->dpkgbuf)-d->dpkgbuf_pos);
 783    d->dpkgbuf_pos += len;
 784    if(len <= 0)
 785       return;
 786
 787    // process line by line if we have a buffer
 788    p = q = d->dpkgbuf;
 789    while((q=(char*)memchr(p, '\n', d->dpkgbuf+d->dpkgbuf_pos-p)) != NULL)
 790    {
 791       *q = 0;
 792       ProcessDpkgStatusLine(p);
 793       p=q+1; // continue with next line
 794    }
 795
 796    // now move the unprocessed bits (after the final \n that is now a 0x0)
 797    // to the start and update d->dpkgbuf_pos
 798    p = (char*)memrchr(d->dpkgbuf, 0, d->dpkgbuf_pos);
 799    if(p == NULL)
 800       return;
 801
 802    // we are interessted in the first char *after* 0x0
 803    p++;
 804
 805    // move the unprocessed tail to the start and update pos
 806    memmove(d->dpkgbuf, p, p-d->dpkgbuf);
 807    d->dpkgbuf_pos = d->dpkgbuf+d->dpkgbuf_pos-p;
 808 }
 809                                                                         /*}}}*/
 810 // DPkgPM::WriteHistoryTag                                              /*{{{*/
 811 void pkgDPkgPM::WriteHistoryTag(string const &tag, string value)
 812 {
 813    size_t const length = value.length();
 814    if (length == 0)
 815       return;
 816    // poor mans rstrip(", ")
 817    if (value[length-2] == ',' && value[length-1] == ' ')
 818       value.erase(length - 2, 2);
 819    fprintf(d->history_out, "%s: %s\n", tag.c_str(), value.c_str());
 820 }                                                                       /*}}}*/
 821 // DPkgPM::OpenLog                                                      /*{{{*/
 822 bool pkgDPkgPM::OpenLog()
 823 {
 824    string const logdir = _config->FindDir("Dir::Log");
 825    if(CreateAPTDirectoryIfNeeded(logdir, logdir) == false)
 826       // FIXME: use a better string after freeze
 827       return _error->Error(_("Directory '%s' missing"), logdir.c_str());
 828
 829    // get current time
 830    char timestr[200];
 831    time_t const t = time(NULL);
 832    struct tm const * const tmp = localtime(&t);
 833    strftime(timestr, sizeof(timestr), "%F  %T", tmp);
 834
 835    // open terminal log
 836    string const logfile_name = flCombine(logdir,
 837                                    _config->Find("Dir::Log::Terminal"));
 838    if (!logfile_name.empty())
 839    {
 840       d->term_out = fopen(logfile_name.c_str(),"a");
 841       if (d->term_out == NULL)
 842          return _error->WarningE("OpenLog", _("Could not open file '%s'"), logfile_name.c_str());
 843       setvbuf(d->term_out, NULL, _IONBF, 0);
 844       SetCloseExec(fileno(d->term_out), true);
 845       if (getuid() == 0) // if we aren't root, we can't chown a file, so don't try it
 846       {
 847          struct passwd *pw = getpwnam("root");
 848          struct group *gr = getgrnam("adm");
 849          if (pw != NULL && gr != NULL && chown(logfile_name.c_str(), pw->pw_uid, gr->gr_gid) != 0)
 850             _error->WarningE("OpenLog", "chown to root:adm of file %s failed", logfile_name.c_str());
 851       }
 852       if (chmod(logfile_name.c_str(), 0640) != 0)
 853          _error->WarningE("OpenLog", "chmod 0640 of file %s failed", logfile_name.c_str());
 854       fprintf(d->term_out, "\nLog started: %s\n", timestr);
 855    }
 856
 857    // write your history
 858    string const history_name = flCombine(logdir,
 859                                    _config->Find("Dir::Log::History"));
 860    if (!history_name.empty())
 861    {
 862       d->history_out = fopen(history_name.c_str(),"a");
 863       if (d->history_out == NULL)
 864          return _error->WarningE("OpenLog", _("Could not open file '%s'"), history_name.c_str());
 865       SetCloseExec(fileno(d->history_out), true);
 866       chmod(history_name.c_str(), 0644);
 867       fprintf(d->history_out, "\nStart-Date: %s\n", timestr);
 868       string remove, purge, install, reinstall, upgrade, downgrade;
 869       for (pkgCache::PkgIterator I = Cache.PkgBegin(); I.end() == false; ++I)
 870       {
 871          enum { CANDIDATE, CANDIDATE_AUTO, CURRENT_CANDIDATE, CURRENT } infostring;
 872          string *line = NULL;
 873          #define HISTORYINFO(X, Y) { line = &X; infostring = Y; }
 874          if (Cache[I].NewInstall() == true)
 875             HISTORYINFO(install, CANDIDATE_AUTO)
 876          else if (Cache[I].ReInstall() == true)
 877             HISTORYINFO(reinstall, CANDIDATE)
 878          else if (Cache[I].Upgrade() == true)
 879             HISTORYINFO(upgrade, CURRENT_CANDIDATE)
 880          else if (Cache[I].Downgrade() == true)
 881             HISTORYINFO(downgrade, CURRENT_CANDIDATE)
 882          else if (Cache[I].Delete() == true)
 883             HISTORYINFO((Cache[I].Purge() ? purge : remove), CURRENT)
 884          else
 885             continue;
 886          #undef HISTORYINFO
 887          line->append(I.FullName(false)).append(" (");
 888          switch (infostring) {
 889          case CANDIDATE: line->append(Cache[I].CandVersion); break;
 890          case CANDIDATE_AUTO:
 891             line->append(Cache[I].CandVersion);
 892             if ((Cache[I].Flags & pkgCache::Flag::Auto) == pkgCache::Flag::Auto)
 893                line->append(", automatic");
 894             break;
 895          case CURRENT_CANDIDATE: line->append(Cache[I].CurVersion).append(", ").append(Cache[I].CandVersion); break;
 896          case CURRENT: line->append(Cache[I].CurVersion); break;
 897          }
 898          line->append("), ");
 899       }
 900       if (_config->Exists("Commandline::AsString") == true)
 901          WriteHistoryTag("Commandline", _config->Find("Commandline::AsString"));
 902       WriteHistoryTag("Install", install);
 903       WriteHistoryTag("Reinstall", reinstall);
 904       WriteHistoryTag("Upgrade", upgrade);
 905       WriteHistoryTag("Downgrade",downgrade);
 906       WriteHistoryTag("Remove",remove);
 907       WriteHistoryTag("Purge",purge);
 908       fflush(d->history_out);
 909    }
 910
 911    return true;
 912 }
 913                                                                         /*}}}*/
 914 // DPkg::CloseLog                                                       /*{{{*/
 915 bool pkgDPkgPM::CloseLog()
 916 {
 917    char timestr[200];
 918    time_t t = time(NULL);
 919    struct tm *tmp = localtime(&t);
 920    strftime(timestr, sizeof(timestr), "%F  %T", tmp);
 921
 922    if(d->term_out)
 923    {
 924       fprintf(d->term_out, "Log ended: ");
 925       fprintf(d->term_out, "%s", timestr);
 926       fprintf(d->term_out, "\n");
 927       fclose(d->term_out);
 928    }
 929    d->term_out = NULL;
 930
 931    if(d->history_out)
 932    {
 933       if (disappearedPkgs.empty() == false)
 934       {
 935          string disappear;
 936          for (std::set<std::string>::const_iterator d = disappearedPkgs.begin();
 937               d != disappearedPkgs.end(); ++d)
 938          {
 939             pkgCache::PkgIterator P = Cache.FindPkg(*d);
 940             disappear.append(*d);
 941             if (P.end() == true)
 942                disappear.append(", ");
 943             else
 944                disappear.append(" (").append(Cache[P].CurVersion).append("), ");
 945          }
 946          WriteHistoryTag("Disappeared", disappear);
 947       }
 948       if (d->dpkg_error.empty() == false)
 949          fprintf(d->history_out, "Error: %s\n", d->dpkg_error.c_str());
 950       fprintf(d->history_out, "End-Date: %s\n", timestr);
 951       fclose(d->history_out);
 952    }
 953    d->history_out = NULL;
 954
 955    return true;
 956 }
 957                                                                         /*}}}*/
 958                                                                         /*}}}*/
 959 /*{{{*/
 960 // This implements a racy version of pselect for those architectures
 961 // that don't have a working implementation.
 962 // FIXME: Probably can be removed on Lenny+1
 963 static int racy_pselect(int nfds, fd_set *readfds, fd_set *writefds,
 964    fd_set *exceptfds, const struct timespec *timeout,
 965    const sigset_t *sigmask)
 966 {
 967    sigset_t origmask;
 968    struct timeval tv;
 969    int retval;
 970
 971    tv.tv_sec = timeout->tv_sec;
 972    tv.tv_usec = timeout->tv_nsec/1000;
 973
 974    sigprocmask(SIG_SETMASK, sigmask, &origmask);
 975    retval = select(nfds, readfds, writefds, exceptfds, &tv);
 976    sigprocmask(SIG_SETMASK, &origmask, 0);
 977    return retval;
 978 }
 979                                                                         /*}}}*/
 980
 981 // DPkgPM::BuildPackagesProgressMap                                     /*{{{*/
 982 void pkgDPkgPM::BuildPackagesProgressMap()
 983 {
 984    // map the dpkg states to the operations that are performed
 985    // (this is sorted in the same way as Item::Ops)
 986    static const struct DpkgState DpkgStatesOpMap[][7] = {
 987       // Install operation
 988       {
 989          {"half-installed", N_("Preparing %s")},
 990          {"unpacked", N_("Unpacking %s") },
 991          {NULL, NULL}
 992       },
 993       // Configure operation
 994       {
 995          {"unpacked",N_("Preparing to configure %s") },
 996          {"half-configured", N_("Configuring %s") },
 997          { "installed", N_("Installed %s")},
 998          {NULL, NULL}
 999       },
1000       // Remove operation
1001       {
1002          {"half-configured", N_("Preparing for removal of %s")},
1003          {"half-installed", N_("Removing %s")},
1004          {"config-files",  N_("Removed %s")},
1005          {NULL, NULL}
1006       },
1007       // Purge operation
1008       {
1009          {"config-files", N_("Preparing to completely remove %s")},
1010          {"not-installed", N_("Completely removed %s")},
1011          {NULL, NULL}
1012       },
1013    };
1014
1015    // init the PackageOps map, go over the list of packages that
1016    // that will be [installed|configured|removed|purged] and add
1017    // them to the PackageOps map (the dpkg states it goes through)
1018    // and the PackageOpsTranslations (human readable strings)
1019    for (vector<Item>::const_iterator I = List.begin(); I != List.end(); ++I)
1020    {
1021       if((*I).Pkg.end() == true)
1022          continue;
1023
1024       string const name = (*I).Pkg.FullName();
1025       PackageOpsDone[name] = 0;
1026       for(int i=0; (DpkgStatesOpMap[(*I).Op][i]).state != NULL; ++i)
1027       {
1028          PackageOps[name].push_back(DpkgStatesOpMap[(*I).Op][i]);
1029          PackagesTotal++;
1030       }
1031    }
1032 }
1033                                                                         /*}}}*/
1034 #if (APT_PKG_MAJOR >= 4 && APT_PKG_MINOR < 13)
1035 bool pkgDPkgPM::Go(int StatusFd)
1036 {
1037    APT::Progress::PackageManager *progress = NULL;
1038    if (StatusFd == -1)
1039       progress = APT::Progress::PackageManagerProgressFactory();
1040    else
1041       progress = new APT::Progress::PackageManagerProgressFd(StatusFd);
1042
1043    return GoNoABIBreak(progress);
1044 }
1045 #endif
1046
1047 void pkgDPkgPM::StartPtyMagic()
1048 {
1049    if (_config->FindB("Dpkg::Use-Pty", true) == false)
1050    {
1051       d->master = d->slave = -1;
1052       return;
1053    }
1054
1055    // setup the pty and stuff
1056    struct winsize win;
1057
1058    // if tcgetattr for both stdin/stdout returns 0 (no error)
1059    // we do the pty magic
1060    _error->PushToStack();
1061    if (tcgetattr(STDIN_FILENO, &d->tt) == 0 &&
1062        tcgetattr(STDOUT_FILENO, &d->tt) == 0)
1063    {
1064        if (ioctl(STDOUT_FILENO, TIOCGWINSZ, (char *)&win) < 0)
1065        {
1066            _error->Errno("ioctl", _("ioctl(TIOCGWINSZ) failed"));
1067        } else if (openpty(&d->master, &d->slave, NULL, &d->tt, &win) < 0)
1068        {
1069            _error->Errno("openpty", _("Can not write log (%s)"), _("Is /dev/pts mounted?"));
1070            d->master = d->slave = -1;
1071         } else {
1072             struct termios rtt;
1073             rtt = d->tt;
1074             cfmakeraw(&rtt);
1075             rtt.c_lflag &= ~ECHO;
1076             rtt.c_lflag |= ISIG;
1077             // block SIGTTOU during tcsetattr to prevent a hang if
1078             // the process is a member of the background process group
1079             // http://www.opengroup.org/onlinepubs/000095399/functions/tcsetattr.html
1080             sigemptyset(&d->sigmask);
1081             sigaddset(&d->sigmask, SIGTTOU);
1082             sigprocmask(SIG_BLOCK,&d->sigmask, &d->original_sigmask);
1083             tcsetattr(0, TCSAFLUSH, &rtt);
1084             sigprocmask(SIG_SETMASK, &d->original_sigmask, 0);
1085         }
1086       }
1087    // complain only if stdout is either a terminal (but still failed) or is an invalid
1088       // descriptor otherwise we would complain about redirection to e.g. /dev/null as well.
1089       else if (isatty(STDOUT_FILENO) == 1 || errno == EBADF)
1090          _error->Errno("tcgetattr", _("Can not write log (%s)"), _("Is stdout a terminal?"));
1091
1092       if (_error->PendingError() == true)
1093          _error->DumpErrors(std::cerr);
1094       _error->RevertToStack();
1095 }
1096
1097 void pkgDPkgPM::StopPtyMagic()
1098 {
1099    if(d->slave > 0)
1100       close(d->slave);
1101    if(d->master >= 0)
1102    {
1103       tcsetattr(0, TCSAFLUSH, &d->tt);
1104       close(d->master);
1105    }
1106 }
1107
1108 // DPkgPM::Go - Run the sequence                                        /*{{{*/
1109 // ---------------------------------------------------------------------
1110 /* This globs the operations and calls dpkg
1111  *
1112  * If it is called with a progress object apt will report the install
1113  * progress to this object. It maps the dpkg states a package goes
1114  * through to human readable (and i10n-able)
1115  * names and calculates a percentage for each step.
1116  */
1117 #if (APT_PKG_MAJOR >= 4 && APT_PKG_MINOR >= 13)
1118 bool pkgDPkgPM::Go(APT::Progress::PackageManager *progress)
1119 #else
1120 bool pkgDPkgPM::GoNoABIBreak(APT::Progress::PackageManager *progress)
1121 #endif
1122 {
1123    pkgPackageManager::SigINTStop = false;
1124    d->progress = progress;
1125
1126    // Generate the base argument list for dpkg
1127    unsigned long StartSize = 0;
1128    std::vector<const char *> Args;
1129    std::string DpkgExecutable = getDpkgExecutable();
1130    Args.push_back(DpkgExecutable.c_str());
1131    StartSize += DpkgExecutable.length();
1132
1133    // Stick in any custom dpkg options
1134    Configuration::Item const *Opts = _config->Tree("DPkg::Options");
1135    if (Opts != 0)
1136    {
1137       Opts = Opts->Child;
1138       for (; Opts != 0; Opts = Opts->Next)
1139       {
1140          if (Opts->Value.empty() == true)
1141             continue;
1142          Args.push_back(Opts->Value.c_str());
1143          StartSize += Opts->Value.length();
1144       }
1145    }
1146
1147    size_t const BaseArgs = Args.size();
1148    // we need to detect if we can qualify packages with the architecture or not
1149    Args.push_back("--assert-multi-arch");
1150    Args.push_back(NULL);
1151
1152    pid_t dpkgAssertMultiArch = ExecFork();
1153    if (dpkgAssertMultiArch == 0)
1154    {
1155       dpkgChrootDirectory();
1156       // redirect everything to the ultimate sink as we only need the exit-status
1157       int const nullfd = open("/dev/null", O_RDONLY);
1158       dup2(nullfd, STDIN_FILENO);
1159       dup2(nullfd, STDOUT_FILENO);
1160       dup2(nullfd, STDERR_FILENO);
1161       execvp(Args[0], (char**) &Args[0]);
1162       _error->WarningE("dpkgGo", "Can't detect if dpkg supports multi-arch!");
1163       _exit(2);
1164    }
1165
1166    fd_set rfds;
1167    struct timespec tv;
1168
1169    unsigned int const MaxArgs = _config->FindI("Dpkg::MaxArgs",8*1024);
1170    unsigned int const MaxArgBytes = _config->FindI("Dpkg::MaxArgBytes",32*1024);
1171    bool const NoTriggers = _config->FindB("DPkg::NoTriggers", false);
1172
1173    if (RunScripts("DPkg::Pre-Invoke") == false)
1174       return false;
1175
1176    if (RunScriptsWithPkgs("DPkg::Pre-Install-Pkgs") == false)
1177       return false;
1178
1179    // support subpressing of triggers processing for special
1180    // cases like d-i that runs the triggers handling manually
1181    bool const SmartConf = (_config->Find("PackageManager::Configure", "all") != "all");
1182    bool const TriggersPending = _config->FindB("DPkg::TriggersPending", false);
1183    if (_config->FindB("DPkg::ConfigurePending", SmartConf) == true)
1184       List.push_back(Item(Item::ConfigurePending, PkgIterator()));
1185
1186    // for the progress
1187    BuildPackagesProgressMap();
1188
1189    d->stdin_is_dev_null = false;
1190
1191    // create log
1192    OpenLog();
1193
1194    bool dpkgMultiArch = false;
1195    if (dpkgAssertMultiArch > 0)
1196    {
1197       int Status = 0;
1198       while (waitpid(dpkgAssertMultiArch, &Status, 0) != dpkgAssertMultiArch)
1199       {
1200          if (errno == EINTR)
1201             continue;
1202          _error->WarningE("dpkgGo", _("Waited for %s but it wasn't there"), "dpkg --assert-multi-arch");
1203          break;
1204       }
1205       if (WIFEXITED(Status) == true && WEXITSTATUS(Status) == 0)
1206          dpkgMultiArch = true;
1207    }
1208
1209    // start pty magic before the loop
1210    StartPtyMagic();
1211
1212    // Tell the progress that its starting and fork dpkg
1213    d->progress->Start(d->master);
1214
1215    // this loop is runs once per dpkg operation
1216    vector<Item>::const_iterator I = List.begin();
1217    while (I != List.end())
1218    {
1219       // Do all actions with the same Op in one run
1220       vector<Item>::const_iterator J = I;
1221       if (TriggersPending == true)
1222          for (; J != List.end(); ++J)
1223          {
1224             if (J->Op == I->Op)
1225                continue;
1226             if (J->Op != Item::TriggersPending)
1227                break;
1228             vector<Item>::const_iterator T = J + 1;
1229             if (T != List.end() && T->Op == I->Op)
1230                continue;
1231             break;
1232          }
1233       else
1234          for (; J != List.end() && J->Op == I->Op; ++J)
1235             /* nothing */;
1236
1237       // keep track of allocated strings for multiarch package names
1238       std::vector<char *> Packages;
1239
1240       // start with the baseset of arguments
1241       unsigned long Size = StartSize;
1242       Args.erase(Args.begin() + BaseArgs, Args.end());
1243
1244       // Now check if we are within the MaxArgs limit
1245       //
1246       // this code below is problematic, because it may happen that
1247       // the argument list is split in a way that A depends on B
1248       // and they are in the same "--configure A B" run
1249       // - with the split they may now be configured in different
1250       //   runs, using Immediate-Configure-All can help prevent this.
1251       if (J - I > (signed)MaxArgs)
1252       {
1253          J = I + MaxArgs;
1254          unsigned long const size = MaxArgs + 10;
1255          Args.reserve(size);
1256          Packages.reserve(size);
1257       }
1258       else
1259       {
1260          unsigned long const size = (J - I) + 10;
1261          Args.reserve(size);
1262          Packages.reserve(size);
1263       }
1264
1265       int fd[2];
1266       if (pipe(fd) != 0)
1267          return _error->Errno("pipe","Failed to create IPC pipe to dpkg");
1268
1269 #define ADDARG(X) Args.push_back(X); Size += strlen(X)
1270 #define ADDARGC(X) Args.push_back(X); Size += sizeof(X) - 1
1271
1272       ADDARGC("--status-fd");
1273       char status_fd_buf[20];
1274       snprintf(status_fd_buf,sizeof(status_fd_buf),"%i", fd[1]);
1275       ADDARG(status_fd_buf);
1276       unsigned long const Op = I->Op;
1277
1278       switch (I->Op)
1279       {
1280          case Item::Remove:
1281          ADDARGC("--force-depends");
1282          ADDARGC("--force-remove-essential");
1283          ADDARGC("--remove");
1284          break;
1285
1286          case Item::Purge:
1287          ADDARGC("--force-depends");
1288          ADDARGC("--force-remove-essential");
1289          ADDARGC("--purge");
1290          break;
1291
1292          case Item::Configure:
1293          ADDARGC("--configure");
1294          break;
1295
1296          case Item::ConfigurePending:
1297          ADDARGC("--configure");
1298          ADDARGC("--pending");
1299          break;
1300
1301          case Item::TriggersPending:
1302          ADDARGC("--triggers-only");
1303          ADDARGC("--pending");
1304          break;
1305
1306          case Item::Install:
1307          ADDARGC("--unpack");
1308          ADDARGC("--auto-deconfigure");
1309          break;
1310       }
1311
1312       if (NoTriggers == true && I->Op != Item::TriggersPending &&
1313           I->Op != Item::ConfigurePending)
1314       {
1315          ADDARGC("--no-triggers");
1316       }
1317 #undef ADDARGC
1318
1319       // Write in the file or package names
1320       if (I->Op == Item::Install)
1321       {
1322          for (;I != J && Size < MaxArgBytes; ++I)
1323          {
1324             if (I->File[0] != '/')
1325                return _error->Error("Internal Error, Pathname to install is not absolute '%s'",I->File.c_str());
1326             Args.push_back(I->File.c_str());
1327             Size += I->File.length();
1328          }
1329       }
1330       else
1331       {
1332          string const nativeArch = _config->Find("APT::Architecture");
1333          unsigned long const oldSize = I->Op == Item::Configure ? Size : 0;
1334          for (;I != J && Size < MaxArgBytes; ++I)
1335          {
1336             if((*I).Pkg.end() == true)
1337                continue;
1338             if (I->Op == Item::Configure && disappearedPkgs.find(I->Pkg.FullName(true)) != disappearedPkgs.end())
1339                continue;
1340             // We keep this here to allow "smooth" transitions from e.g. multiarch dpkg/ubuntu to dpkg/debian
1341             if (dpkgMultiArch == false && (I->Pkg.Arch() == nativeArch ||
1342                                            strcmp(I->Pkg.Arch(), "all") == 0 ||
1343                                            strcmp(I->Pkg.Arch(), "none") == 0))
1344             {
1345                char const * const name = I->Pkg.Name();
1346                ADDARG(name);
1347             }
1348             else
1349             {
1350                pkgCache::VerIterator PkgVer;
1351                std::string name = I->Pkg.Name();
1352                if (Op == Item::Remove || Op == Item::Purge)
1353                {
1354                   PkgVer = I->Pkg.CurrentVer();
1355                   if(PkgVer.end() == true)
1356                      PkgVer = FindNowVersion(I->Pkg);
1357                }
1358                else
1359                   PkgVer = Cache[I->Pkg].InstVerIter(Cache);
1360                if (strcmp(I->Pkg.Arch(), "none") == 0)
1361                   ; // never arch-qualify a package without an arch
1362                else if (PkgVer.end() == false)
1363                   name.append(":").append(PkgVer.Arch());
1364                else
1365                   _error->Warning("Can not find PkgVer for '%s'", name.c_str());
1366                char * const fullname = strdup(name.c_str());
1367                Packages.push_back(fullname);
1368                ADDARG(fullname);
1369             }
1370          }
1371          // skip configure action if all sheduled packages disappeared
1372          if (oldSize == Size)
1373             continue;
1374       }
1375 #undef ADDARG
1376
1377       J = I;
1378
1379       if (_config->FindB("Debug::pkgDPkgPM",false) == true)
1380       {
1381          for (std::vector<const char *>::const_iterator a = Args.begin();
1382               a != Args.end(); ++a)
1383             clog << *a << ' ';
1384          clog << endl;
1385          continue;
1386       }
1387       Args.push_back(NULL);
1388
1389       cout << flush;
1390       clog << flush;
1391       cerr << flush;
1392
1393       /* Mask off sig int/quit. We do this because dpkg also does when
1394          it forks scripts. What happens is that when you hit ctrl-c it sends
1395          it to all processes in the group. Since dpkg ignores the signal
1396          it doesn't die but we do! So we must also ignore it */
1397       sighandler_t old_SIGQUIT = signal(SIGQUIT,SIG_IGN);
1398       sighandler_t old_SIGINT = signal(SIGINT,SigINT);
1399
1400       // Check here for any SIGINT
1401       if (pkgPackageManager::SigINTStop && (Op == Item::Remove || Op == Item::Purge || Op == Item::Install))
1402          break;
1403
1404
1405       // ignore SIGHUP as well (debian #463030)
1406       sighandler_t old_SIGHUP = signal(SIGHUP,SIG_IGN);
1407
1408       // now run dpkg
1409       d->progress->StartDpkg();
1410       std::set<int> KeepFDs;
1411       KeepFDs.insert(fd[1]);
1412       MergeKeepFdsFromConfiguration(KeepFDs);
1413       pid_t Child = ExecFork(KeepFDs);
1414       if (Child == 0)
1415       {
1416          // This is the child
1417          if(d->slave >= 0 && d->master >= 0)
1418          {
1419             setsid();
1420             int res = ioctl(d->slave, TIOCSCTTY, 0);
1421             if (res < 0) {
1422                std::cerr << "ioctl(TIOCSCTTY) failed for fd: "
1423                          << d->slave << std::endl;
1424             } else {
1425                close(d->master);
1426                dup2(d->slave, 0);
1427                dup2(d->slave, 1);
1428                dup2(d->slave, 2);
1429                close(d->slave);
1430             }
1431          }
1432          close(fd[0]); // close the read end of the pipe
1433
1434          dpkgChrootDirectory();
1435
1436          if (chdir(_config->FindDir("DPkg::Run-Directory","/").c_str()) != 0)
1437             _exit(100);
1438
1439          if (_config->FindB("DPkg::FlushSTDIN",true) == true && isatty(STDIN_FILENO))
1440          {
1441             int Flags;
1442             int dummy = 0;
1443             if ((Flags = fcntl(STDIN_FILENO,F_GETFL,dummy)) < 0)
1444                _exit(100);
1445
1446             // Discard everything in stdin before forking dpkg
1447             if (fcntl(STDIN_FILENO,F_SETFL,Flags | O_NONBLOCK) < 0)
1448                _exit(100);
1449
1450             while (read(STDIN_FILENO,&dummy,1) == 1);
1451
1452             if (fcntl(STDIN_FILENO,F_SETFL,Flags & (~(long)O_NONBLOCK)) < 0)
1453                _exit(100);
1454          }
1455
1456          /* No Job Control Stop Env is a magic dpkg var that prevents it
1457             from using sigstop */
1458          putenv((char *)"DPKG_NO_TSTP=yes");
1459          execvp(Args[0], (char**) &Args[0]);
1460          cerr << "Could not exec dpkg!" << endl;
1461          _exit(100);
1462       }
1463
1464       // apply ionice
1465       if (_config->FindB("DPkg::UseIoNice", false) == true)
1466          ionice(Child);
1467
1468       // Wait for dpkg
1469       int Status = 0;
1470
1471       // we read from dpkg here
1472       int const _dpkgin = fd[0];
1473       close(fd[1]);                        // close the write end of the pipe
1474
1475       // setups fds
1476       sigemptyset(&d->sigmask);
1477       sigprocmask(SIG_BLOCK,&d->sigmask,&d->original_sigmask);
1478
1479       /* free vectors (and therefore memory) as we don't need the included data anymore */
1480       for (std::vector<char *>::const_iterator p = Packages.begin();
1481            p != Packages.end(); ++p)
1482          free(*p);
1483       Packages.clear();
1484
1485       // the result of the waitpid call
1486       int res;
1487       int select_ret;
1488       while ((res=waitpid(Child,&Status, WNOHANG)) != Child) {
1489          if(res < 0) {
1490             // FIXME: move this to a function or something, looks ugly here
1491             // error handling, waitpid returned -1
1492             if (errno == EINTR)
1493                continue;
1494             RunScripts("DPkg::Post-Invoke");
1495
1496             // Restore sig int/quit
1497             signal(SIGQUIT,old_SIGQUIT);
1498             signal(SIGINT,old_SIGINT);
1499
1500             signal(SIGHUP,old_SIGHUP);
1501             return _error->Errno("waitpid","Couldn't wait for subprocess");
1502          }
1503
1504          // wait for input or output here
1505          FD_ZERO(&rfds);
1506          if (d->master >= 0 && !d->stdin_is_dev_null)
1507             FD_SET(0, &rfds);
1508          FD_SET(_dpkgin, &rfds);
1509          if(d->master >= 0)
1510             FD_SET(d->master, &rfds);
1511          tv.tv_sec = 0;
1512          tv.tv_nsec = d->progress->GetPulseInterval();
1513          select_ret = pselect(max(d->master, _dpkgin)+1, &rfds, NULL, NULL,
1514                               &tv, &d->original_sigmask);
1515          if (select_ret < 0 && (errno == EINVAL || errno == ENOSYS))
1516             select_ret = racy_pselect(max(d->master, _dpkgin)+1, &rfds, NULL,
1517                                       NULL, &tv, &d->original_sigmask);
1518          d->progress->Pulse();
1519          if (select_ret == 0)
1520             continue;
1521          else if (select_ret < 0 && errno == EINTR)
1522             continue;
1523          else if (select_ret < 0)
1524          {
1525             perror("select() returned error");
1526             continue;
1527          }
1528
1529          if(d->master >= 0 && FD_ISSET(d->master, &rfds))
1530             DoTerminalPty(d->master);
1531          if(d->master >= 0 && FD_ISSET(0, &rfds))
1532             DoStdin(d->master);
1533          if(FD_ISSET(_dpkgin, &rfds))
1534             DoDpkgStatusFd(_dpkgin);
1535       }
1536       close(_dpkgin);
1537
1538       // Restore sig int/quit
1539       signal(SIGQUIT,old_SIGQUIT);
1540       signal(SIGINT,old_SIGINT);
1541
1542       signal(SIGHUP,old_SIGHUP);
1543       // Check for an error code.
1544       if (WIFEXITED(Status) == 0 || WEXITSTATUS(Status) != 0)
1545       {
1546          // if it was set to "keep-dpkg-runing" then we won't return
1547          // here but keep the loop going and just report it as a error
1548          // for later
1549          bool const stopOnError = _config->FindB("Dpkg::StopOnError",true);
1550
1551          if (WIFSIGNALED(Status) != 0 && WTERMSIG(Status) == SIGSEGV)
1552             strprintf(d->dpkg_error, "Sub-process %s received a segmentation fault.",Args[0]);
1553          else if (WIFEXITED(Status) != 0)
1554             strprintf(d->dpkg_error, "Sub-process %s returned an error code (%u)",Args[0],WEXITSTATUS(Status));
1555          else
1556             strprintf(d->dpkg_error, "Sub-process %s exited unexpectedly",Args[0]);
1557          _error->Error("%s", d->dpkg_error.c_str());
1558
1559          if(stopOnError)
1560             break;
1561       }
1562    }
1563    // dpkg is done at this point
1564    d->progress->Stop();
1565    StopPtyMagic();
1566    CloseLog();
1567
1568    if (pkgPackageManager::SigINTStop)
1569        _error->Warning(_("Operation was interrupted before it could finish"));
1570
1571    if (RunScripts("DPkg::Post-Invoke") == false)
1572       return false;
1573
1574    if (_config->FindB("Debug::pkgDPkgPM",false) == false)
1575    {
1576       std::string const oldpkgcache = _config->FindFile("Dir::cache::pkgcache");
1577       if (oldpkgcache.empty() == false && RealFileExists(oldpkgcache) == true &&
1578           unlink(oldpkgcache.c_str()) == 0)
1579       {
1580          std::string const srcpkgcache = _config->FindFile("Dir::cache::srcpkgcache");
1581          if (srcpkgcache.empty() == false && RealFileExists(srcpkgcache) == true)
1582          {
1583             _error->PushToStack();
1584             pkgCacheFile CacheFile;
1585             CacheFile.BuildCaches(NULL, true);
1586             _error->RevertToStack();
1587          }
1588       }
1589    }
1590
1591    Cache.writeStateFile(NULL);
1592    return d->dpkg_error.empty();
1593 }
1594
1595 void SigINT(int /*sig*/) {
1596    pkgPackageManager::SigINTStop = true;
1597 }
1598                                                                         /*}}}*/
1599 // pkgDpkgPM::Reset - Dump the contents of the command list             /*{{{*/
1600 // ---------------------------------------------------------------------
1601 /* */
1602 void pkgDPkgPM::Reset()
1603 {
1604    List.erase(List.begin(),List.end());
1605 }
1606                                                                         /*}}}*/
1607 // pkgDpkgPM::WriteApportReport - write out error report pkg failure    /*{{{*/
1608 // ---------------------------------------------------------------------
1609 /* */
1610 void pkgDPkgPM::WriteApportReport(const char *pkgpath, const char *errormsg)
1611 {
1612    // If apport doesn't exist or isn't installed do nothing
1613    // This e.g. prevents messages in 'universes' without apport
1614    pkgCache::PkgIterator apportPkg = Cache.FindPkg("apport");
1615    if (apportPkg.end() == true || apportPkg->CurrentVer == 0)
1616       return;
1617
1618    string pkgname, reportfile, srcpkgname, pkgver, arch;
1619    string::size_type pos;
1620    FILE *report;
1621
1622    if (_config->FindB("Dpkg::ApportFailureReport", true) == false)
1623    {
1624       std::clog << "configured to not write apport reports" << std::endl;
1625       return;
1626    }
1627
1628    // only report the first errors
1629    if(pkgFailures > _config->FindI("APT::Apport::MaxReports", 3))
1630    {
1631       std::clog << _("No apport report written because MaxReports is reached already") << std::endl;
1632       return;
1633    }
1634
1635    // check if its not a follow up error
1636    const char *needle = dgettext("dpkg", "dependency problems - leaving unconfigured");
1637    if(strstr(errormsg, needle) != NULL) {
1638       std::clog << _("No apport report written because the error message indicates its a followup error from a previous failure.") << std::endl;
1639       return;
1640    }
1641
1642    // do not report disk-full failures
1643    if(strstr(errormsg, strerror(ENOSPC)) != NULL) {
1644       std::clog << _("No apport report written because the error message indicates a disk full error") << std::endl;
1645       return;
1646    }
1647
1648    // do not report out-of-memory failures
1649    if(strstr(errormsg, strerror(ENOMEM)) != NULL ||
1650       strstr(errormsg, "failed to allocate memory") != NULL) {
1651       std::clog << _("No apport report written because the error message indicates a out of memory error") << std::endl;
1652       return;
1653    }
1654
1655    // do not report bugs regarding inaccessible local files
1656    if(strstr(errormsg, strerror(ENOENT)) != NULL ||
1657       strstr(errormsg, "cannot access archive") != NULL) {
1658       std::clog << _("No apport report written because the error message indicates an issue on the local system") << std::endl;
1659       return;
1660    }
1661
1662    // do not report errors encountered when decompressing packages
1663    if(strstr(errormsg, "--fsys-tarfile returned error exit status 2") != NULL) {
1664       std::clog << _("No apport report written because the error message indicates an issue on the local system") << std::endl;
1665       return;
1666    }
1667
1668    // do not report dpkg I/O errors, this is a format string, so we compare
1669    // the prefix and the suffix of the error with the dpkg error message
1670    vector<string> io_errors;
1671    io_errors.push_back(string("failed to read on buffer copy for %s"));
1672    io_errors.push_back(string("failed in write on buffer copy for %s"));
1673    io_errors.push_back(string("short read on buffer copy for %s"));
1674
1675    for (vector<string>::iterator I = io_errors.begin(); I != io_errors.end(); ++I)
1676    {
1677       vector<string> list = VectorizeString(dgettext("dpkg", (*I).c_str()), '%');
1678       if (list.size() > 1) {
1679          // we need to split %s, VectorizeString only allows char so we need
1680          // to kill the "s" manually
1681          if (list[1].size() > 1) {
1682             list[1].erase(0, 1);
1683             if(strstr(errormsg, list[0].c_str()) &&
1684                strstr(errormsg, list[1].c_str())) {
1685                std::clog << _("No apport report written because the error message indicates a dpkg I/O error") << std::endl;
1686                return;
1687             }
1688          }
1689       }
1690    }
1691
1692    // get the pkgname and reportfile
1693    pkgname = flNotDir(pkgpath);
1694    pos = pkgname.find('_');
1695    if(pos != string::npos)
1696       pkgname = pkgname.substr(0, pos);
1697
1698    // find the package versin and source package name
1699    pkgCache::PkgIterator Pkg = Cache.FindPkg(pkgname);
1700    if (Pkg.end() == true)
1701       return;
1702    pkgCache::VerIterator Ver = Cache.GetCandidateVer(Pkg);
1703    if (Ver.end() == true)
1704       return;
1705    pkgver = Ver.VerStr() == NULL ? "unknown" : Ver.VerStr();
1706    pkgRecords Recs(Cache);
1707    pkgRecords::Parser &Parse = Recs.Lookup(Ver.FileList());
1708    srcpkgname = Parse.SourcePkg();
1709    if(srcpkgname.empty())
1710       srcpkgname = pkgname;
1711
1712    // if the file exists already, we check:
1713    // - if it was reported already (touched by apport).
1714    //   If not, we do nothing, otherwise
1715    //    we overwrite it. This is the same behaviour as apport
1716    // - if we have a report with the same pkgversion already
1717    //   then we skip it
1718    reportfile = flCombine("/var/crash",pkgname+".0.crash");
1719    if(FileExists(reportfile))
1720    {
1721       struct stat buf;
1722       char strbuf[255];
1723
1724       // check atime/mtime
1725       stat(reportfile.c_str(), &buf);
1726       if(buf.st_mtime > buf.st_atime)
1727          return;
1728
1729       // check if the existing report is the same version
1730       report = fopen(reportfile.c_str(),"r");
1731       while(fgets(strbuf, sizeof(strbuf), report) != NULL)
1732       {
1733          if(strstr(strbuf,"Package:") == strbuf)
1734          {
1735             char pkgname[255], version[255];
1736             if(sscanf(strbuf, "Package: %254s %254s", pkgname, version) == 2)
1737                if(strcmp(pkgver.c_str(), version) == 0)
1738                {
1739                   fclose(report);
1740                   return;
1741                }
1742          }
1743       }
1744       fclose(report);
1745    }
1746
1747    // now write the report
1748    arch = _config->Find("APT::Architecture");
1749    report = fopen(reportfile.c_str(),"w");
1750    if(report == NULL)
1751       return;
1752    if(_config->FindB("DPkgPM::InitialReportOnly",false) == true)
1753       chmod(reportfile.c_str(), 0);
1754    else
1755       chmod(reportfile.c_str(), 0600);
1756    fprintf(report, "ProblemType: Package\n");
1757    fprintf(report, "Architecture: %s\n", arch.c_str());
1758    time_t now = time(NULL);
1759    fprintf(report, "Date: %s" , ctime(&now));
1760    fprintf(report, "Package: %s %s\n", pkgname.c_str(), pkgver.c_str());
1761    fprintf(report, "SourcePackage: %s\n", srcpkgname.c_str());
1762    fprintf(report, "ErrorMessage:\n %s\n", errormsg);
1763
1764    // ensure that the log is flushed
1765    if(d->term_out)
1766       fflush(d->term_out);
1767
1768    // attach terminal log it if we have it
1769    string logfile_name = _config->FindFile("Dir::Log::Terminal");
1770    if (!logfile_name.empty())
1771    {
1772       FILE *log = NULL;
1773
1774       fprintf(report, "DpkgTerminalLog:\n");
1775       log = fopen(logfile_name.c_str(),"r");
1776       if(log != NULL)
1777       {
1778          char buf[1024];
1779          while( fgets(buf, sizeof(buf), log) != NULL)
1780             fprintf(report, " %s", buf);
1781          fprintf(report, " \n");
1782          fclose(log);
1783       }
1784    }
1785
1786    // attach history log it if we have it
1787    string histfile_name = _config->FindFile("Dir::Log::History");
1788    if (!histfile_name.empty())
1789    {
1790       fprintf(report, "DpkgHistoryLog:\n");
1791       FILE* log = fopen(histfile_name.c_str(),"r");
1792       if(log != NULL)
1793       {
1794          char buf[1024];
1795          while( fgets(buf, sizeof(buf), log) != NULL)
1796             fprintf(report, " %s", buf);
1797          fclose(log);
1798       }
1799    }
1800
1801    // log the ordering
1802    const char *ops_str[] = {"Install", "Configure","Remove","Purge"};
1803    fprintf(report, "AptOrdering:\n");
1804    for (vector<Item>::iterator I = List.begin(); I != List.end(); ++I)
1805       if ((*I).Pkg != NULL)
1806          fprintf(report, " %s: %s\n", (*I).Pkg.Name(), ops_str[(*I).Op]);
1807       else
1808          fprintf(report, " %s: %s\n", "NULL", ops_str[(*I).Op]);
1809
1810    // attach dmesg log (to learn about segfaults)
1811    if (FileExists("/bin/dmesg"))
1812    {
1813       fprintf(report, "Dmesg:\n");
1814       FILE *log = popen("/bin/dmesg","r");
1815       if(log != NULL)
1816       {
1817          char buf[1024];
1818          while( fgets(buf, sizeof(buf), log) != NULL)
1819             fprintf(report, " %s", buf);
1820          pclose(log);
1821       }
1822    }
1823
1824    // attach df -l log (to learn about filesystem status)
1825    if (FileExists("/bin/df"))
1826    {
1827
1828       fprintf(report, "Df:\n");
1829       FILE *log = popen("/bin/df -l","r");
1830       if(log != NULL)
1831       {
1832          char buf[1024];
1833          while( fgets(buf, sizeof(buf), log) != NULL)
1834             fprintf(report, " %s", buf);
1835          pclose(log);
1836       }
1837    }
1838
1839    fclose(report);
1840
1841 }
1842                                                                         /*}}}*/