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/dpkgpm.h>
  14 #include <apt-pkg/error.h>
  15 #include <apt-pkg/configuration.h>
  16 #include <apt-pkg/depcache.h>
  17 #include <apt-pkg/pkgrecords.h>
  18 #include <apt-pkg/strutl.h>
  19 #include <apt-pkg/fileutl.h>
  20 #include <apt-pkg/cachefile.h>
  21 #include <apt-pkg/packagemanager.h>
  22
  23 #include <unistd.h>
  24 #include <stdlib.h>
  25 #include <fcntl.h>
  26 #include <sys/select.h>
  27 #include <sys/stat.h>
  28 #include <sys/types.h>
  29 #include <sys/wait.h>
  30 #include <signal.h>
  31 #include <errno.h>
  32 #include <string.h>
  33 #include <stdio.h>
  34 #include <string.h>
  35 #include <algorithm>
  36 #include <sstream>
  37 #include <map>
  38 #include <pwd.h>
  39 #include <grp.h>
  40
  41 #include <termios.h>
  42 #include <unistd.h>
  43 #include <sys/ioctl.h>
  44 #include <pty.h>
  45
  46 #include <apti18n.h>
  47                                                                         /*}}}*/
  48
  49 using namespace std;
  50
  51 class pkgDPkgPMPrivate
  52 {
  53 public:
  54    pkgDPkgPMPrivate() : stdin_is_dev_null(false), dpkgbuf_pos(0),
  55                         term_out(NULL), history_out(NULL)
  56    {
  57       dpkgbuf[0] = '\0';
  58    }
  59    bool stdin_is_dev_null;
  60    // the buffer we use for the dpkg status-fd reading
  61    char dpkgbuf[1024];
  62    int dpkgbuf_pos;
  63    FILE *term_out;
  64    FILE *history_out;
  65    string dpkg_error;
  66 };
  67
  68 namespace
  69 {
  70   // Maps the dpkg "processing" info to human readable names.  Entry 0
  71   // of each array is the key, entry 1 is the value.
  72   const std::pair<const char *, const char *> PackageProcessingOps[] = {
  73     std::make_pair("install",   N_("Installing %s")),
  74     std::make_pair("configure", N_("Configuring %s")),
  75     std::make_pair("remove",    N_("Removing %s")),
  76     std::make_pair("purge",    N_("Completely removing %s")),
  77     std::make_pair("disappear", N_("Noting disappearance of %s")),
  78     std::make_pair("trigproc",  N_("Running post-installation trigger %s"))
  79   };
  80
  81   const std::pair<const char *, const char *> * const PackageProcessingOpsBegin = PackageProcessingOps;
  82   const std::pair<const char *, const char *> * const PackageProcessingOpsEnd   = PackageProcessingOps + sizeof(PackageProcessingOps) / sizeof(PackageProcessingOps[0]);
  83
  84   // Predicate to test whether an entry in the PackageProcessingOps
  85   // array matches a string.
  86   class MatchProcessingOp
  87   {
  88     const char *target;
  89
  90   public:
  91     MatchProcessingOp(const char *the_target)
  92       : target(the_target)
  93     {
  94     }
  95
  96     bool operator()(const std::pair<const char *, const char *> &pair) const
  97     {
  98       return strcmp(pair.first, target) == 0;
  99     }
 100   };
 101 }
 102
 103 /* helper function to ionice the given PID
 104
 105  there is no C header for ionice yet - just the syscall interface
 106  so we use the binary from util-linux
 107 */
 108 static bool
 109 ionice(int PID)
 110 {
 111    if (!FileExists("/usr/bin/ionice"))
 112       return false;
 113    pid_t Process = ExecFork();
 114    if (Process == 0)
 115    {
 116       char buf[32];
 117       snprintf(buf, sizeof(buf), "-p%d", PID);
 118       const char *Args[4];
 119       Args[0] = "/usr/bin/ionice";
 120       Args[1] = "-c3";
 121       Args[2] = buf;
 122       Args[3] = 0;
 123       execv(Args[0], (char **)Args);
 124    }
 125    return ExecWait(Process, "ionice");
 126 }
 127
 128 // dpkgChrootDirectory - chrooting for dpkg if needed                   /*{{{*/
 129 static void dpkgChrootDirectory()
 130 {
 131    std::string const chrootDir = _config->FindDir("DPkg::Chroot-Directory");
 132    if (chrootDir == "/")
 133       return;
 134    std::cerr << "Chrooting into " << chrootDir << std::endl;
 135    if (chroot(chrootDir.c_str()) != 0)
 136       _exit(100);
 137    if (chdir("/") != 0)
 138       _exit(100);
 139 }
 140                                                                         /*}}}*/
 141
 142
 143 // FindNowVersion - Helper to find a Version in "now" state     /*{{{*/
 144 // ---------------------------------------------------------------------
 145 /* This is helpful when a package is no longer installed but has residual
 146  * config files
 147  */
 148 static
 149 pkgCache::VerIterator FindNowVersion(const pkgCache::PkgIterator &Pkg)
 150 {
 151    pkgCache::VerIterator Ver;
 152    for (Ver = Pkg.VersionList(); Ver.end() == false; ++Ver)
 153    {
 154       pkgCache::VerFileIterator Vf = Ver.FileList();
 155       pkgCache::PkgFileIterator F = Vf.File();
 156       for (F = Vf.File(); F.end() == false; ++F)
 157       {
 158          if (F && F.Archive())
 159          {
 160             if (strcmp(F.Archive(), "now"))
 161                return Ver;
 162          }
 163       }
 164    }
 165    return Ver;
 166 }
 167                                                                         /*}}}*/
 168
 169 // DPkgPM::pkgDPkgPM - Constructor                                      /*{{{*/
 170 // ---------------------------------------------------------------------
 171 /* */
 172 pkgDPkgPM::pkgDPkgPM(pkgDepCache *Cache)
 173    : pkgPackageManager(Cache), PackagesDone(0), PackagesTotal(0)
 174 {
 175    d = new pkgDPkgPMPrivate();
 176 }
 177                                                                         /*}}}*/
 178 // DPkgPM::pkgDPkgPM - Destructor                                       /*{{{*/
 179 // ---------------------------------------------------------------------
 180 /* */
 181 pkgDPkgPM::~pkgDPkgPM()
 182 {
 183    delete d;
 184 }
 185                                                                         /*}}}*/
 186 // DPkgPM::Install - Install a package                                  /*{{{*/
 187 // ---------------------------------------------------------------------
 188 /* Add an install operation to the sequence list */
 189 bool pkgDPkgPM::Install(PkgIterator Pkg,string File)
 190 {
 191    if (File.empty() == true || Pkg.end() == true)
 192       return _error->Error("Internal Error, No file name for %s",Pkg.FullName().c_str());
 193
 194    // If the filename string begins with DPkg::Chroot-Directory, return the
 195    // substr that is within the chroot so dpkg can access it.
 196    string const chrootdir = _config->FindDir("DPkg::Chroot-Directory","/");
 197    if (chrootdir != "/" && File.find(chrootdir) == 0)
 198    {
 199       size_t len = chrootdir.length();
 200       if (chrootdir.at(len - 1) == '/')
 201         len--;
 202       List.push_back(Item(Item::Install,Pkg,File.substr(len)));
 203    }
 204    else
 205       List.push_back(Item(Item::Install,Pkg,File));
 206
 207    return true;
 208 }
 209                                                                         /*}}}*/
 210 // DPkgPM::Configure - Configure a package                              /*{{{*/
 211 // ---------------------------------------------------------------------
 212 /* Add a configure operation to the sequence list */
 213 bool pkgDPkgPM::Configure(PkgIterator Pkg)
 214 {
 215    if (Pkg.end() == true)
 216       return false;
 217
 218    List.push_back(Item(Item::Configure, Pkg));
 219
 220    // Use triggers for config calls if we configure "smart"
 221    // as otherwise Pre-Depends will not be satisfied, see #526774
 222    if (_config->FindB("DPkg::TriggersPending", false) == true)
 223       List.push_back(Item(Item::TriggersPending, PkgIterator()));
 224
 225    return true;
 226 }
 227                                                                         /*}}}*/
 228 // DPkgPM::Remove - Remove a package                                    /*{{{*/
 229 // ---------------------------------------------------------------------
 230 /* Add a remove operation to the sequence list */
 231 bool pkgDPkgPM::Remove(PkgIterator Pkg,bool Purge)
 232 {
 233    if (Pkg.end() == true)
 234       return false;
 235
 236    if (Purge == true)
 237       List.push_back(Item(Item::Purge,Pkg));
 238    else
 239       List.push_back(Item(Item::Remove,Pkg));
 240    return true;
 241 }
 242                                                                         /*}}}*/
 243 // DPkgPM::SendPkgInfo - Send info for install-pkgs hook                /*{{{*/
 244 // ---------------------------------------------------------------------
 245 /* This is part of the helper script communication interface, it sends
 246    very complete information down to the other end of the pipe.*/
 247 bool pkgDPkgPM::SendV2Pkgs(FILE *F)
 248 {
 249    return SendPkgsInfo(F, 2);
 250 }
 251 bool pkgDPkgPM::SendPkgsInfo(FILE * const F, unsigned int const &Version)
 252 {
 253    // This version of APT supports only v3, so don't sent higher versions
 254    if (Version <= 3)
 255       fprintf(F,"VERSION %u\n", Version);
 256    else
 257       fprintf(F,"VERSION 3\n");
 258
 259    /* Write out all of the configuration directives by walking the
 260       configuration tree */
 261    const Configuration::Item *Top = _config->Tree(0);
 262    for (; Top != 0;)
 263    {
 264       if (Top->Value.empty() == false)
 265       {
 266          fprintf(F,"%s=%s\n",
 267                  QuoteString(Top->FullTag(),"=\"\n").c_str(),
 268                  QuoteString(Top->Value,"\n").c_str());
 269       }
 270
 271       if (Top->Child != 0)
 272       {
 273          Top = Top->Child;
 274          continue;
 275       }
 276
 277       while (Top != 0 && Top->Next == 0)
 278          Top = Top->Parent;
 279       if (Top != 0)
 280          Top = Top->Next;
 281    }
 282    fprintf(F,"\n");
 283
 284    // Write out the package actions in order.
 285    for (vector<Item>::iterator I = List.begin(); I != List.end(); ++I)
 286    {
 287       if(I->Pkg.end() == true)
 288          continue;
 289
 290       pkgDepCache::StateCache &S = Cache[I->Pkg];
 291
 292       fprintf(F,"%s ",I->Pkg.Name());
 293
 294       // Current version which we are going to replace
 295       pkgCache::VerIterator CurVer = I->Pkg.CurrentVer();
 296       if (CurVer.end() == true && (I->Op == Item::Remove || I->Op == Item::Purge))
 297          CurVer = FindNowVersion(I->Pkg);
 298
 299       if (CurVer.end() == true)
 300       {
 301          if (Version <= 2)
 302             fprintf(F, "- ");
 303          else
 304             fprintf(F, "- - none ");
 305       }
 306       else
 307       {
 308          fprintf(F, "%s ", CurVer.VerStr());
 309          if (Version >= 3)
 310             fprintf(F, "%s %s ", CurVer.Arch(), CurVer.MultiArchType());
 311       }
 312
 313       // Show the compare operator between current and install version
 314       if (S.InstallVer != 0)
 315       {
 316          pkgCache::VerIterator const InstVer = S.InstVerIter(Cache);
 317          int Comp = 2;
 318          if (CurVer.end() == false)
 319             Comp = InstVer.CompareVer(CurVer);
 320          if (Comp < 0)
 321             fprintf(F,"> ");
 322          else if (Comp == 0)
 323             fprintf(F,"= ");
 324          else if (Comp > 0)
 325             fprintf(F,"< ");
 326          fprintf(F, "%s ", InstVer.VerStr());
 327          if (Version >= 3)
 328             fprintf(F, "%s %s ", InstVer.Arch(), InstVer.MultiArchType());
 329       }
 330       else
 331       {
 332          if (Version <= 2)
 333             fprintf(F, "> - ");
 334          else
 335             fprintf(F, "> - - none ");
 336       }
 337
 338       // Show the filename/operation
 339       if (I->Op == Item::Install)
 340       {
 341          // No errors here..
 342          if (I->File[0] != '/')
 343             fprintf(F,"**ERROR**\n");
 344          else
 345             fprintf(F,"%s\n",I->File.c_str());
 346       }
 347       else if (I->Op == Item::Configure)
 348          fprintf(F,"**CONFIGURE**\n");
 349       else if (I->Op == Item::Remove ||
 350           I->Op == Item::Purge)
 351          fprintf(F,"**REMOVE**\n");
 352
 353       if (ferror(F) != 0)
 354          return false;
 355    }
 356    return true;
 357 }
 358                                                                         /*}}}*/
 359 // DPkgPM::RunScriptsWithPkgs - Run scripts with package names on stdin /*{{{*/
 360 // ---------------------------------------------------------------------
 361 /* This looks for a list of scripts to run from the configuration file
 362    each one is run and is fed on standard input a list of all .deb files
 363    that are due to be installed. */
 364 bool pkgDPkgPM::RunScriptsWithPkgs(const char *Cnf)
 365 {
 366    Configuration::Item const *Opts = _config->Tree(Cnf);
 367    if (Opts == 0 || Opts->Child == 0)
 368       return true;
 369    Opts = Opts->Child;
 370
 371    unsigned int Count = 1;
 372    for (; Opts != 0; Opts = Opts->Next, Count++)
 373    {
 374       if (Opts->Value.empty() == true)
 375          continue;
 376
 377       // Determine the protocol version
 378       string OptSec = Opts->Value;
 379       string::size_type Pos;
 380       if ((Pos = OptSec.find(' ')) == string::npos || Pos == 0)
 381          Pos = OptSec.length();
 382       OptSec = "DPkg::Tools::Options::" + string(Opts->Value.c_str(),Pos);
 383
 384       unsigned int Version = _config->FindI(OptSec+"::Version",1);
 385       unsigned int InfoFD = _config->FindI(OptSec + "::InfoFD", STDIN_FILENO);
 386
 387       // Create the pipes
 388       int Pipes[2];
 389       if (pipe(Pipes) != 0)
 390          return _error->Errno("pipe","Failed to create IPC pipe to subprocess");
 391       if (InfoFD != (unsigned)Pipes[0])
 392          SetCloseExec(Pipes[0],true);
 393       else
 394          _config->Set("APT::Keep-Fds::", Pipes[0]);
 395       SetCloseExec(Pipes[1],true);
 396
 397       // Purified Fork for running the script
 398       pid_t Process = ExecFork();
 399       if (Process == 0)
 400       {
 401          // Setup the FDs
 402          dup2(Pipes[0], InfoFD);
 403          SetCloseExec(STDOUT_FILENO,false);
 404          SetCloseExec(STDIN_FILENO,false);
 405          SetCloseExec(STDERR_FILENO,false);
 406
 407          string hookfd;
 408          strprintf(hookfd, "%d", InfoFD);
 409          setenv("APT_HOOK_INFO_FD", hookfd.c_str(), 1);
 410
 411          dpkgChrootDirectory();
 412          const char *Args[4];
 413          Args[0] = "/bin/sh";
 414          Args[1] = "-c";
 415          Args[2] = Opts->Value.c_str();
 416          Args[3] = 0;
 417          execv(Args[0],(char **)Args);
 418          _exit(100);
 419       }
 420       if (InfoFD == (unsigned)Pipes[0])
 421          _config->Clear("APT::Keep-Fds", Pipes[0]);
 422       close(Pipes[0]);
 423       FILE *F = fdopen(Pipes[1],"w");
 424       if (F == 0)
 425          return _error->Errno("fdopen","Faild to open new FD");
 426
 427       // Feed it the filenames.
 428       if (Version <= 1)
 429       {
 430          for (vector<Item>::iterator I = List.begin(); I != List.end(); ++I)
 431          {
 432             // Only deal with packages to be installed from .deb
 433             if (I->Op != Item::Install)
 434                continue;
 435
 436             // No errors here..
 437             if (I->File[0] != '/')
 438                continue;
 439
 440             /* Feed the filename of each package that is pending install
 441                into the pipe. */
 442             fprintf(F,"%s\n",I->File.c_str());
 443             if (ferror(F) != 0)
 444                break;
 445          }
 446       }
 447       else
 448          SendPkgsInfo(F, Version);
 449
 450       fclose(F);
 451
 452       // Clean up the sub process
 453       if (ExecWait(Process,Opts->Value.c_str()) == false)
 454          return _error->Error("Failure running script %s",Opts->Value.c_str());
 455    }
 456
 457    return true;
 458 }
 459                                                                         /*}}}*/
 460 // DPkgPM::DoStdin - Read stdin and pass to slave pty                   /*{{{*/
 461 // ---------------------------------------------------------------------
 462 /*
 463 */
 464 void pkgDPkgPM::DoStdin(int master)
 465 {
 466    unsigned char input_buf[256] = {0,};
 467    ssize_t len = read(0, input_buf, sizeof(input_buf));
 468    if (len)
 469       FileFd::Write(master, input_buf, len);
 470    else
 471       d->stdin_is_dev_null = true;
 472 }
 473                                                                         /*}}}*/
 474 // DPkgPM::DoTerminalPty - Read the terminal pty and write log          /*{{{*/
 475 // ---------------------------------------------------------------------
 476 /*
 477  * read the terminal pty and write log
 478  */
 479 void pkgDPkgPM::DoTerminalPty(int master)
 480 {
 481    unsigned char term_buf[1024] = {0,0, };
 482
 483    ssize_t len=read(master, term_buf, sizeof(term_buf));
 484    if(len == -1 && errno == EIO)
 485    {
 486       // this happens when the child is about to exit, we
 487       // give it time to actually exit, otherwise we run
 488       // into a race so we sleep for half a second.
 489       struct timespec sleepfor = { 0, 500000000 };
 490       nanosleep(&sleepfor, NULL);
 491       return;
 492    }
 493    if(len <= 0)
 494       return;
 495    FileFd::Write(1, term_buf, len);
 496    if(d->term_out)
 497       fwrite(term_buf, len, sizeof(char), d->term_out);
 498 }
 499                                                                         /*}}}*/
 500 // DPkgPM::ProcessDpkgStatusBuf                                         /*{{{*/
 501 // ---------------------------------------------------------------------
 502 /*
 503  */
 504 void pkgDPkgPM::ProcessDpkgStatusLine(int OutStatusFd, char *line)
 505 {
 506    bool const Debug = _config->FindB("Debug::pkgDPkgProgressReporting",false);
 507    // the status we output
 508    ostringstream status;
 509
 510    if (Debug == true)
 511       std::clog << "got from dpkg '" << line << "'" << std::endl;
 512
 513
 514    /* dpkg sends strings like this:
 515       'status:   <pkg>:  <pkg  qstate>'
 516       errors look like this:
 517       '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
 518       and conffile-prompt like this
 519       'status: conffile-prompt: conffile : 'current-conffile' 'new-conffile' useredited distedited
 520
 521       Newer versions of dpkg sent also:
 522       'processing: install: pkg'
 523       'processing: configure: pkg'
 524       'processing: remove: pkg'
 525       'processing: purge: pkg'
 526       'processing: disappear: pkg'
 527       'processing: trigproc: trigger'
 528
 529    */
 530    char* list[6];
 531    //        dpkg sends multiline error messages sometimes (see
 532    //        #374195 for a example. we should support this by
 533    //        either patching dpkg to not send multiline over the
 534    //        statusfd or by rewriting the code here to deal with
 535    //        it. for now we just ignore it and not crash
 536    TokSplitString(':', line, list, sizeof(list)/sizeof(list[0]));
 537    if( list[0] == NULL || list[1] == NULL || list[2] == NULL)
 538    {
 539       if (Debug == true)
 540          std::clog << "ignoring line: not enough ':'" << std::endl;
 541       return;
 542    }
 543    const char* const pkg = list[1];
 544    const char* action = _strstrip(list[2]);
 545
 546    // 'processing' from dpkg looks like
 547    // 'processing: action: pkg'
 548    if(strncmp(list[0], "processing", strlen("processing")) == 0)
 549    {
 550       char s[200];
 551       const char* const pkg_or_trigger = _strstrip(list[2]);
 552       action = _strstrip( list[1]);
 553       const std::pair<const char *, const char *> * const iter =
 554         std::find_if(PackageProcessingOpsBegin,
 555                      PackageProcessingOpsEnd,
 556                      MatchProcessingOp(action));
 557       if(iter == PackageProcessingOpsEnd)
 558       {
 559          if (Debug == true)
 560             std::clog << "ignoring unknown action: " << action << std::endl;
 561          return;
 562       }
 563       snprintf(s, sizeof(s), _(iter->second), pkg_or_trigger);
 564
 565       status << "pmstatus:" << pkg_or_trigger
 566              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 567              << ":" << s
 568              << endl;
 569       if(OutStatusFd > 0)
 570          FileFd::Write(OutStatusFd, status.str().c_str(), status.str().size());
 571       if (Debug == true)
 572          std::clog << "send: '" << status.str() << "'" << endl;
 573
 574       if (strncmp(action, "disappear", strlen("disappear")) == 0)
 575          handleDisappearAction(pkg_or_trigger);
 576       return;
 577    }
 578
 579    if(strncmp(action,"error",strlen("error")) == 0)
 580    {
 581       // urgs, sometime has ":" in its error string so that we
 582       // end up with the error message split between list[3]
 583       // and list[4], e.g. the message:
 584       // "failed in buffer_write(fd) (10, ret=-1): backend dpkg-deb ..."
 585       // concat them again
 586       if( list[4] != NULL )
 587          list[3][strlen(list[3])] = ':';
 588
 589       status << "pmerror:" << list[1]
 590              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 591              << ":" << list[3]
 592              << endl;
 593       if(OutStatusFd > 0)
 594          FileFd::Write(OutStatusFd, status.str().c_str(), status.str().size());
 595       if (Debug == true)
 596          std::clog << "send: '" << status.str() << "'" << endl;
 597       pkgFailures++;
 598       WriteApportReport(list[1], list[3]);
 599       return;
 600    }
 601    else if(strncmp(action,"conffile",strlen("conffile")) == 0)
 602    {
 603       status << "pmconffile:" << list[1]
 604              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 605              << ":" << list[3]
 606              << endl;
 607       if(OutStatusFd > 0)
 608          FileFd::Write(OutStatusFd, status.str().c_str(), status.str().size());
 609       if (Debug == true)
 610          std::clog << "send: '" << status.str() << "'" << endl;
 611       return;
 612    }
 613
 614    vector<struct DpkgState> const &states = PackageOps[pkg];
 615    const char *next_action = NULL;
 616    if(PackageOpsDone[pkg] < states.size())
 617       next_action = states[PackageOpsDone[pkg]].state;
 618    // check if the package moved to the next dpkg state
 619    if(next_action && (strcmp(action, next_action) == 0))
 620    {
 621       // only read the translation if there is actually a next
 622       // action
 623       const char *translation = _(states[PackageOpsDone[pkg]].str);
 624       char s[200];
 625       snprintf(s, sizeof(s), translation, pkg);
 626
 627       // we moved from one dpkg state to a new one, report that
 628       PackageOpsDone[pkg]++;
 629       PackagesDone++;
 630       // build the status str
 631       status << "pmstatus:" << pkg
 632              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 633              << ":" << s
 634              << endl;
 635       if(OutStatusFd > 0)
 636          FileFd::Write(OutStatusFd, status.str().c_str(), status.str().size());
 637       if (Debug == true)
 638          std::clog << "send: '" << status.str() << "'" << endl;
 639    }
 640    if (Debug == true)
 641       std::clog << "(parsed from dpkg) pkg: " << pkg
 642                 << " action: " << action << endl;
 643 }
 644                                                                         /*}}}*/
 645 // DPkgPM::handleDisappearAction                                        /*{{{*/
 646 void pkgDPkgPM::handleDisappearAction(string const &pkgname)
 647 {
 648    // record the package name for display and stuff later
 649    disappearedPkgs.insert(pkgname);
 650
 651    pkgCache::PkgIterator Pkg = Cache.FindPkg(pkgname);
 652    if (unlikely(Pkg.end() == true))
 653       return;
 654    // the disappeared package was auto-installed - nothing to do
 655    if ((Cache[Pkg].Flags & pkgCache::Flag::Auto) == pkgCache::Flag::Auto)
 656       return;
 657    pkgCache::VerIterator PkgVer = Cache[Pkg].InstVerIter(Cache);
 658    if (unlikely(PkgVer.end() == true))
 659       return;
 660    /* search in the list of dependencies for (Pre)Depends,
 661       check if this dependency has a Replaces on our package
 662       and if so transfer the manual installed flag to it */
 663    for (pkgCache::DepIterator Dep = PkgVer.DependsList(); Dep.end() != true; ++Dep)
 664    {
 665       if (Dep->Type != pkgCache::Dep::Depends &&
 666           Dep->Type != pkgCache::Dep::PreDepends)
 667          continue;
 668       pkgCache::PkgIterator Tar = Dep.TargetPkg();
 669       if (unlikely(Tar.end() == true))
 670          continue;
 671       // the package is already marked as manual
 672       if ((Cache[Tar].Flags & pkgCache::Flag::Auto) != pkgCache::Flag::Auto)
 673          continue;
 674       pkgCache::VerIterator TarVer =  Cache[Tar].InstVerIter(Cache);
 675       if (TarVer.end() == true)
 676          continue;
 677       for (pkgCache::DepIterator Rep = TarVer.DependsList(); Rep.end() != true; ++Rep)
 678       {
 679          if (Rep->Type != pkgCache::Dep::Replaces)
 680             continue;
 681          if (Pkg != Rep.TargetPkg())
 682             continue;
 683          // okay, they are strongly connected - transfer manual-bit
 684          if (Debug == true)
 685             std::clog << "transfer manual-bit from disappeared »" << pkgname << "« to »" << Tar.FullName() << "«" << std::endl;
 686          Cache[Tar].Flags &= ~Flag::Auto;
 687          break;
 688       }
 689    }
 690 }
 691                                                                         /*}}}*/
 692 // DPkgPM::DoDpkgStatusFd                                               /*{{{*/
 693 // ---------------------------------------------------------------------
 694 /*
 695  */
 696 void pkgDPkgPM::DoDpkgStatusFd(int statusfd, int OutStatusFd)
 697 {
 698    char *p, *q;
 699    int len;
 700
 701    len=read(statusfd, &d->dpkgbuf[d->dpkgbuf_pos], sizeof(d->dpkgbuf)-d->dpkgbuf_pos);
 702    d->dpkgbuf_pos += len;
 703    if(len <= 0)
 704       return;
 705
 706    // process line by line if we have a buffer
 707    p = q = d->dpkgbuf;
 708    while((q=(char*)memchr(p, '\n', d->dpkgbuf+d->dpkgbuf_pos-p)) != NULL)
 709    {
 710       *q = 0;
 711       ProcessDpkgStatusLine(OutStatusFd, p);
 712       p=q+1; // continue with next line
 713    }
 714
 715    // now move the unprocessed bits (after the final \n that is now a 0x0)
 716    // to the start and update d->dpkgbuf_pos
 717    p = (char*)memrchr(d->dpkgbuf, 0, d->dpkgbuf_pos);
 718    if(p == NULL)
 719       return;
 720
 721    // we are interessted in the first char *after* 0x0
 722    p++;
 723
 724    // move the unprocessed tail to the start and update pos
 725    memmove(d->dpkgbuf, p, p-d->dpkgbuf);
 726    d->dpkgbuf_pos = d->dpkgbuf+d->dpkgbuf_pos-p;
 727 }
 728                                                                         /*}}}*/
 729 // DPkgPM::WriteHistoryTag                                              /*{{{*/
 730 void pkgDPkgPM::WriteHistoryTag(string const &tag, string value)
 731 {
 732    size_t const length = value.length();
 733    if (length == 0)
 734       return;
 735    // poor mans rstrip(", ")
 736    if (value[length-2] == ',' && value[length-1] == ' ')
 737       value.erase(length - 2, 2);
 738    fprintf(d->history_out, "%s: %s\n", tag.c_str(), value.c_str());
 739 }                                                                       /*}}}*/
 740 // DPkgPM::OpenLog                                                      /*{{{*/
 741 bool pkgDPkgPM::OpenLog()
 742 {
 743    string const logdir = _config->FindDir("Dir::Log");
 744    if(CreateAPTDirectoryIfNeeded(logdir, logdir) == false)
 745       // FIXME: use a better string after freeze
 746       return _error->Error(_("Directory '%s' missing"), logdir.c_str());
 747
 748    // get current time
 749    char timestr[200];
 750    time_t const t = time(NULL);
 751    struct tm const * const tmp = localtime(&t);
 752    strftime(timestr, sizeof(timestr), "%F  %T", tmp);
 753
 754    // open terminal log
 755    string const logfile_name = flCombine(logdir,
 756                                    _config->Find("Dir::Log::Terminal"));
 757    if (!logfile_name.empty())
 758    {
 759       d->term_out = fopen(logfile_name.c_str(),"a");
 760       if (d->term_out == NULL)
 761          return _error->WarningE("OpenLog", _("Could not open file '%s'"), logfile_name.c_str());
 762       setvbuf(d->term_out, NULL, _IONBF, 0);
 763       SetCloseExec(fileno(d->term_out), true);
 764       if (getuid() == 0) // if we aren't root, we can't chown a file, so don't try it
 765       {
 766          struct passwd *pw = getpwnam("root");
 767          struct group *gr = getgrnam("adm");
 768          if (pw != NULL && gr != NULL && chown(logfile_name.c_str(), pw->pw_uid, gr->gr_gid) != 0)
 769             _error->WarningE("OpenLog", "chown to root:adm of file %s failed", logfile_name.c_str());
 770       }
 771       if (chmod(logfile_name.c_str(), 0640) != 0)
 772          _error->WarningE("OpenLog", "chmod 0640 of file %s failed", logfile_name.c_str());
 773       fprintf(d->term_out, "\nLog started: %s\n", timestr);
 774    }
 775
 776    // write your history
 777    string const history_name = flCombine(logdir,
 778                                    _config->Find("Dir::Log::History"));
 779    if (!history_name.empty())
 780    {
 781       d->history_out = fopen(history_name.c_str(),"a");
 782       if (d->history_out == NULL)
 783          return _error->WarningE("OpenLog", _("Could not open file '%s'"), history_name.c_str());
 784       SetCloseExec(fileno(d->history_out), true);
 785       chmod(history_name.c_str(), 0644);
 786       fprintf(d->history_out, "\nStart-Date: %s\n", timestr);
 787       string remove, purge, install, reinstall, upgrade, downgrade;
 788       for (pkgCache::PkgIterator I = Cache.PkgBegin(); I.end() == false; ++I)
 789       {
 790          enum { CANDIDATE, CANDIDATE_AUTO, CURRENT_CANDIDATE, CURRENT } infostring;
 791          string *line = NULL;
 792          #define HISTORYINFO(X, Y) { line = &X; infostring = Y; }
 793          if (Cache[I].NewInstall() == true)
 794             HISTORYINFO(install, CANDIDATE_AUTO)
 795          else if (Cache[I].ReInstall() == true)
 796             HISTORYINFO(reinstall, CANDIDATE)
 797          else if (Cache[I].Upgrade() == true)
 798             HISTORYINFO(upgrade, CURRENT_CANDIDATE)
 799          else if (Cache[I].Downgrade() == true)
 800             HISTORYINFO(downgrade, CURRENT_CANDIDATE)
 801          else if (Cache[I].Delete() == true)
 802             HISTORYINFO((Cache[I].Purge() ? purge : remove), CURRENT)
 803          else
 804             continue;
 805          #undef HISTORYINFO
 806          line->append(I.FullName(false)).append(" (");
 807          switch (infostring) {
 808          case CANDIDATE: line->append(Cache[I].CandVersion); break;
 809          case CANDIDATE_AUTO:
 810             line->append(Cache[I].CandVersion);
 811             if ((Cache[I].Flags & pkgCache::Flag::Auto) == pkgCache::Flag::Auto)
 812                line->append(", automatic");
 813             break;
 814          case CURRENT_CANDIDATE: line->append(Cache[I].CurVersion).append(", ").append(Cache[I].CandVersion); break;
 815          case CURRENT: line->append(Cache[I].CurVersion); break;
 816          }
 817          line->append("), ");
 818       }
 819       if (_config->Exists("Commandline::AsString") == true)
 820          WriteHistoryTag("Commandline", _config->Find("Commandline::AsString"));
 821       WriteHistoryTag("Install", install);
 822       WriteHistoryTag("Reinstall", reinstall);
 823       WriteHistoryTag("Upgrade", upgrade);
 824       WriteHistoryTag("Downgrade",downgrade);
 825       WriteHistoryTag("Remove",remove);
 826       WriteHistoryTag("Purge",purge);
 827       fflush(d->history_out);
 828    }
 829
 830    return true;
 831 }
 832                                                                         /*}}}*/
 833 // DPkg::CloseLog                                                       /*{{{*/
 834 bool pkgDPkgPM::CloseLog()
 835 {
 836    char timestr[200];
 837    time_t t = time(NULL);
 838    struct tm *tmp = localtime(&t);
 839    strftime(timestr, sizeof(timestr), "%F  %T", tmp);
 840
 841    if(d->term_out)
 842    {
 843       fprintf(d->term_out, "Log ended: ");
 844       fprintf(d->term_out, "%s", timestr);
 845       fprintf(d->term_out, "\n");
 846       fclose(d->term_out);
 847    }
 848    d->term_out = NULL;
 849
 850    if(d->history_out)
 851    {
 852       if (disappearedPkgs.empty() == false)
 853       {
 854          string disappear;
 855          for (std::set<std::string>::const_iterator d = disappearedPkgs.begin();
 856               d != disappearedPkgs.end(); ++d)
 857          {
 858             pkgCache::PkgIterator P = Cache.FindPkg(*d);
 859             disappear.append(*d);
 860             if (P.end() == true)
 861                disappear.append(", ");
 862             else
 863                disappear.append(" (").append(Cache[P].CurVersion).append("), ");
 864          }
 865          WriteHistoryTag("Disappeared", disappear);
 866       }
 867       if (d->dpkg_error.empty() == false)
 868          fprintf(d->history_out, "Error: %s\n", d->dpkg_error.c_str());
 869       fprintf(d->history_out, "End-Date: %s\n", timestr);
 870       fclose(d->history_out);
 871    }
 872    d->history_out = NULL;
 873
 874    return true;
 875 }
 876                                                                         /*}}}*/
 877 /*{{{*/
 878 // This implements a racy version of pselect for those architectures
 879 // that don't have a working implementation.
 880 // FIXME: Probably can be removed on Lenny+1
 881 static int racy_pselect(int nfds, fd_set *readfds, fd_set *writefds,
 882    fd_set *exceptfds, const struct timespec *timeout,
 883    const sigset_t *sigmask)
 884 {
 885    sigset_t origmask;
 886    struct timeval tv;
 887    int retval;
 888
 889    tv.tv_sec = timeout->tv_sec;
 890    tv.tv_usec = timeout->tv_nsec/1000;
 891
 892    sigprocmask(SIG_SETMASK, sigmask, &origmask);
 893    retval = select(nfds, readfds, writefds, exceptfds, &tv);
 894    sigprocmask(SIG_SETMASK, &origmask, 0);
 895    return retval;
 896 }
 897 /*}}}*/
 898 // DPkgPM::Go - Run the sequence                                        /*{{{*/
 899 // ---------------------------------------------------------------------
 900 /* This globs the operations and calls dpkg
 901  *
 902  * If it is called with "OutStatusFd" set to a valid file descriptor
 903  * apt will report the install progress over this fd. It maps the
 904  * dpkg states a package goes through to human readable (and i10n-able)
 905  * names and calculates a percentage for each step.
 906 */
 907 bool pkgDPkgPM::Go(int OutStatusFd)
 908 {
 909    pkgPackageManager::SigINTStop = false;
 910
 911    // Generate the base argument list for dpkg
 912    std::vector<const char *> Args;
 913    unsigned long StartSize = 0;
 914    string Tmp = _config->Find("Dir::Bin::dpkg","dpkg");
 915    {
 916       string const dpkgChrootDir = _config->FindDir("DPkg::Chroot-Directory", "/");
 917       size_t dpkgChrootLen = dpkgChrootDir.length();
 918       if (dpkgChrootDir != "/" && Tmp.find(dpkgChrootDir) == 0)
 919       {
 920          if (dpkgChrootDir[dpkgChrootLen - 1] == '/')
 921             --dpkgChrootLen;
 922          Tmp = Tmp.substr(dpkgChrootLen);
 923       }
 924    }
 925    Args.push_back(Tmp.c_str());
 926    StartSize += Tmp.length();
 927
 928    // Stick in any custom dpkg options
 929    Configuration::Item const *Opts = _config->Tree("DPkg::Options");
 930    if (Opts != 0)
 931    {
 932       Opts = Opts->Child;
 933       for (; Opts != 0; Opts = Opts->Next)
 934       {
 935          if (Opts->Value.empty() == true)
 936             continue;
 937          Args.push_back(Opts->Value.c_str());
 938          StartSize += Opts->Value.length();
 939       }
 940    }
 941
 942    size_t const BaseArgs = Args.size();
 943    // we need to detect if we can qualify packages with the architecture or not
 944    Args.push_back("--assert-multi-arch");
 945    Args.push_back(NULL);
 946
 947    pid_t dpkgAssertMultiArch = ExecFork();
 948    if (dpkgAssertMultiArch == 0)
 949    {
 950       dpkgChrootDirectory();
 951       // redirect everything to the ultimate sink as we only need the exit-status
 952       int const nullfd = open("/dev/null", O_RDONLY);
 953       dup2(nullfd, STDIN_FILENO);
 954       dup2(nullfd, STDOUT_FILENO);
 955       dup2(nullfd, STDERR_FILENO);
 956       execvp(Args[0], (char**) &Args[0]);
 957       _error->WarningE("dpkgGo", "Can't detect if dpkg supports multi-arch!");
 958       _exit(2);
 959    }
 960
 961    fd_set rfds;
 962    struct timespec tv;
 963    sigset_t sigmask;
 964    sigset_t original_sigmask;
 965
 966    unsigned int const MaxArgs = _config->FindI("Dpkg::MaxArgs",8*1024);
 967    unsigned int const MaxArgBytes = _config->FindI("Dpkg::MaxArgBytes",32*1024);
 968    bool const NoTriggers = _config->FindB("DPkg::NoTriggers", false);
 969
 970    if (RunScripts("DPkg::Pre-Invoke") == false)
 971       return false;
 972
 973    if (RunScriptsWithPkgs("DPkg::Pre-Install-Pkgs") == false)
 974       return false;
 975
 976    // support subpressing of triggers processing for special
 977    // cases like d-i that runs the triggers handling manually
 978    bool const SmartConf = (_config->Find("PackageManager::Configure", "all") != "all");
 979    bool const TriggersPending = _config->FindB("DPkg::TriggersPending", false);
 980    if (_config->FindB("DPkg::ConfigurePending", SmartConf) == true)
 981       List.push_back(Item(Item::ConfigurePending, PkgIterator()));
 982
 983    // map the dpkg states to the operations that are performed
 984    // (this is sorted in the same way as Item::Ops)
 985    static const struct DpkgState DpkgStatesOpMap[][7] = {
 986       // Install operation
 987       {
 988          {"half-installed", N_("Preparing %s")},
 989          {"unpacked", N_("Unpacking %s") },
 990          {NULL, NULL}
 991       },
 992       // Configure operation
 993       {
 994          {"unpacked",N_("Preparing to configure %s") },
 995          {"half-configured", N_("Configuring %s") },
 996          { "installed", N_("Installed %s")},
 997          {NULL, NULL}
 998       },
 999       // Remove operation
1000       {
1001          {"half-configured", N_("Preparing for removal of %s")},
1002          {"half-installed", N_("Removing %s")},
1003          {"config-files",  N_("Removed %s")},
1004          {NULL, NULL}
1005       },
1006       // Purge operation
1007       {
1008          {"config-files", N_("Preparing to completely remove %s")},
1009          {"not-installed", N_("Completely removed %s")},
1010          {NULL, NULL}
1011       },
1012    };
1013
1014    // init the PackageOps map, go over the list of packages that
1015    // that will be [installed|configured|removed|purged] and add
1016    // them to the PackageOps map (the dpkg states it goes through)
1017    // and the PackageOpsTranslations (human readable strings)
1018    for (vector<Item>::const_iterator I = List.begin(); I != List.end(); ++I)
1019    {
1020       if((*I).Pkg.end() == true)
1021          continue;
1022
1023       string const name = (*I).Pkg.Name();
1024       PackageOpsDone[name] = 0;
1025       for(int i=0; (DpkgStatesOpMap[(*I).Op][i]).state != NULL; ++i)
1026       {
1027          PackageOps[name].push_back(DpkgStatesOpMap[(*I).Op][i]);
1028          PackagesTotal++;
1029       }
1030    }
1031
1032    d->stdin_is_dev_null = false;
1033
1034    // create log
1035    OpenLog();
1036
1037    bool dpkgMultiArch = false;
1038    if (dpkgAssertMultiArch > 0)
1039    {
1040       int Status = 0;
1041       while (waitpid(dpkgAssertMultiArch, &Status, 0) != dpkgAssertMultiArch)
1042       {
1043          if (errno == EINTR)
1044             continue;
1045          _error->WarningE("dpkgGo", _("Waited for %s but it wasn't there"), "dpkg --assert-multi-arch");
1046          break;
1047       }
1048       if (WIFEXITED(Status) == true && WEXITSTATUS(Status) == 0)
1049          dpkgMultiArch = true;
1050    }
1051
1052    // this loop is runs once per operation
1053    for (vector<Item>::const_iterator I = List.begin(); I != List.end();)
1054    {
1055       // Do all actions with the same Op in one run
1056       vector<Item>::const_iterator J = I;
1057       if (TriggersPending == true)
1058          for (; J != List.end(); ++J)
1059          {
1060             if (J->Op == I->Op)
1061                continue;
1062             if (J->Op != Item::TriggersPending)
1063                break;
1064             vector<Item>::const_iterator T = J + 1;
1065             if (T != List.end() && T->Op == I->Op)
1066                continue;
1067             break;
1068          }
1069       else
1070          for (; J != List.end() && J->Op == I->Op; ++J)
1071             /* nothing */;
1072
1073       // keep track of allocated strings for multiarch package names
1074       std::vector<char *> Packages;
1075
1076       // start with the baseset of arguments
1077       unsigned long Size = StartSize;
1078       Args.erase(Args.begin() + BaseArgs, Args.end());
1079
1080       // Now check if we are within the MaxArgs limit
1081       //
1082       // this code below is problematic, because it may happen that
1083       // the argument list is split in a way that A depends on B
1084       // and they are in the same "--configure A B" run
1085       // - with the split they may now be configured in different
1086       //   runs, using Immediate-Configure-All can help prevent this.
1087       if (J - I > (signed)MaxArgs)
1088       {
1089          J = I + MaxArgs;
1090          unsigned long const size = MaxArgs + 10;
1091          Args.reserve(size);
1092          Packages.reserve(size);
1093       }
1094       else
1095       {
1096          unsigned long const size = (J - I) + 10;
1097          Args.reserve(size);
1098          Packages.reserve(size);
1099       }
1100
1101       int fd[2];
1102       if (pipe(fd) != 0)
1103          return _error->Errno("pipe","Failed to create IPC pipe to dpkg");
1104
1105 #define ADDARG(X) Args.push_back(X); Size += strlen(X)
1106 #define ADDARGC(X) Args.push_back(X); Size += sizeof(X) - 1
1107
1108       ADDARGC("--status-fd");
1109       char status_fd_buf[20];
1110       snprintf(status_fd_buf,sizeof(status_fd_buf),"%i", fd[1]);
1111       ADDARG(status_fd_buf);
1112       unsigned long const Op = I->Op;
1113
1114       switch (I->Op)
1115       {
1116          case Item::Remove:
1117          ADDARGC("--force-depends");
1118          ADDARGC("--force-remove-essential");
1119          ADDARGC("--remove");
1120          break;
1121
1122          case Item::Purge:
1123          ADDARGC("--force-depends");
1124          ADDARGC("--force-remove-essential");
1125          ADDARGC("--purge");
1126          break;
1127
1128          case Item::Configure:
1129          ADDARGC("--configure");
1130          break;
1131
1132          case Item::ConfigurePending:
1133          ADDARGC("--configure");
1134          ADDARGC("--pending");
1135          break;
1136
1137          case Item::TriggersPending:
1138          ADDARGC("--triggers-only");
1139          ADDARGC("--pending");
1140          break;
1141
1142          case Item::Install:
1143          ADDARGC("--unpack");
1144          ADDARGC("--auto-deconfigure");
1145          break;
1146       }
1147
1148       if (NoTriggers == true && I->Op != Item::TriggersPending &&
1149           I->Op != Item::ConfigurePending)
1150       {
1151          ADDARGC("--no-triggers");
1152       }
1153 #undef ADDARGC
1154
1155       // Write in the file or package names
1156       if (I->Op == Item::Install)
1157       {
1158          for (;I != J && Size < MaxArgBytes; ++I)
1159          {
1160             if (I->File[0] != '/')
1161                return _error->Error("Internal Error, Pathname to install is not absolute '%s'",I->File.c_str());
1162             Args.push_back(I->File.c_str());
1163             Size += I->File.length();
1164          }
1165       }
1166       else
1167       {
1168          string const nativeArch = _config->Find("APT::Architecture");
1169          unsigned long const oldSize = I->Op == Item::Configure ? Size : 0;
1170          for (;I != J && Size < MaxArgBytes; ++I)
1171          {
1172             if((*I).Pkg.end() == true)
1173                continue;
1174             if (I->Op == Item::Configure && disappearedPkgs.find(I->Pkg.Name()) != disappearedPkgs.end())
1175                continue;
1176             // We keep this here to allow "smooth" transitions from e.g. multiarch dpkg/ubuntu to dpkg/debian
1177             if (dpkgMultiArch == false && (I->Pkg.Arch() == nativeArch ||
1178                                            strcmp(I->Pkg.Arch(), "all") == 0 ||
1179                                            strcmp(I->Pkg.Arch(), "none") == 0))
1180             {
1181                char const * const name = I->Pkg.Name();
1182                ADDARG(name);
1183             }
1184             else
1185             {
1186                pkgCache::VerIterator PkgVer;
1187                std::string name = I->Pkg.Name();
1188                if (Op == Item::Remove || Op == Item::Purge)
1189                {
1190                   PkgVer = I->Pkg.CurrentVer();
1191                   if(PkgVer.end() == true)
1192                      PkgVer = FindNowVersion(I->Pkg);
1193                }
1194                else
1195                   PkgVer = Cache[I->Pkg].InstVerIter(Cache);
1196                if (strcmp(I->Pkg.Arch(), "none") == 0)
1197                   ; // never arch-qualify a package without an arch
1198                else if (PkgVer.end() == false)
1199                   name.append(":").append(PkgVer.Arch());
1200                else
1201                   _error->Warning("Can not find PkgVer for '%s'", name.c_str());
1202                char * const fullname = strdup(name.c_str());
1203                Packages.push_back(fullname);
1204                ADDARG(fullname);
1205             }
1206          }
1207          // skip configure action if all sheduled packages disappeared
1208          if (oldSize == Size)
1209             continue;
1210       }
1211 #undef ADDARG
1212
1213       J = I;
1214
1215       if (_config->FindB("Debug::pkgDPkgPM",false) == true)
1216       {
1217          for (std::vector<const char *>::const_iterator a = Args.begin();
1218               a != Args.end(); ++a)
1219             clog << *a << ' ';
1220          clog << endl;
1221          continue;
1222       }
1223       Args.push_back(NULL);
1224
1225       cout << flush;
1226       clog << flush;
1227       cerr << flush;
1228
1229       /* Mask off sig int/quit. We do this because dpkg also does when
1230          it forks scripts. What happens is that when you hit ctrl-c it sends
1231          it to all processes in the group. Since dpkg ignores the signal
1232          it doesn't die but we do! So we must also ignore it */
1233       sighandler_t old_SIGQUIT = signal(SIGQUIT,SIG_IGN);
1234       sighandler_t old_SIGINT = signal(SIGINT,SigINT);
1235
1236       // Check here for any SIGINT
1237       if (pkgPackageManager::SigINTStop && (Op == Item::Remove || Op == Item::Purge || Op == Item::Install))
1238          break;
1239
1240
1241       // ignore SIGHUP as well (debian #463030)
1242       sighandler_t old_SIGHUP = signal(SIGHUP,SIG_IGN);
1243
1244       struct    termios tt;
1245       struct    winsize win;
1246       int       master = -1;
1247       int       slave = -1;
1248
1249       // if tcgetattr does not return zero there was a error
1250       // and we do not do any pty magic
1251       _error->PushToStack();
1252       if (tcgetattr(STDOUT_FILENO, &tt) == 0)
1253       {
1254          ioctl(0, TIOCGWINSZ, (char *)&win);
1255          if (openpty(&master, &slave, NULL, &tt, &win) < 0)
1256          {
1257             _error->Errno("openpty", _("Can not write log (%s)"), _("Is /dev/pts mounted?"));
1258             master = slave = -1;
1259          }  else {
1260             struct termios rtt;
1261             rtt = tt;
1262             cfmakeraw(&rtt);
1263             rtt.c_lflag &= ~ECHO;
1264             rtt.c_lflag |= ISIG;
1265             // block SIGTTOU during tcsetattr to prevent a hang if
1266             // the process is a member of the background process group
1267             // http://www.opengroup.org/onlinepubs/000095399/functions/tcsetattr.html
1268             sigemptyset(&sigmask);
1269             sigaddset(&sigmask, SIGTTOU);
1270             sigprocmask(SIG_BLOCK,&sigmask, &original_sigmask);
1271             tcsetattr(0, TCSAFLUSH, &rtt);
1272             sigprocmask(SIG_SETMASK, &original_sigmask, 0);
1273          }
1274       }
1275       // complain only if stdout is either a terminal (but still failed) or is an invalid
1276       // descriptor otherwise we would complain about redirection to e.g. /dev/null as well.
1277       else if (isatty(STDOUT_FILENO) == 1 || errno == EBADF)
1278          _error->Errno("tcgetattr", _("Can not write log (%s)"), _("Is stdout a terminal?"));
1279
1280       if (_error->PendingError() == true)
1281          _error->DumpErrors(std::cerr);
1282       _error->RevertToStack();
1283
1284        // Fork dpkg
1285       pid_t Child;
1286       _config->Set("APT::Keep-Fds::",fd[1]);
1287       // send status information that we are about to fork dpkg
1288       if(OutStatusFd > 0) {
1289          ostringstream status;
1290          status << "pmstatus:dpkg-exec:"
1291                 << (PackagesDone/float(PackagesTotal)*100.0)
1292                 << ":" << _("Running dpkg")
1293                 << endl;
1294          FileFd::Write(OutStatusFd, status.str().c_str(), status.str().size());
1295       }
1296       Child = ExecFork();
1297
1298       // This is the child
1299       if (Child == 0)
1300       {
1301          if(slave >= 0 && master >= 0)
1302          {
1303             setsid();
1304             ioctl(slave, TIOCSCTTY, 0);
1305             close(master);
1306             dup2(slave, 0);
1307             dup2(slave, 1);
1308             dup2(slave, 2);
1309             close(slave);
1310          }
1311          close(fd[0]); // close the read end of the pipe
1312
1313          dpkgChrootDirectory();
1314
1315          if (chdir(_config->FindDir("DPkg::Run-Directory","/").c_str()) != 0)
1316             _exit(100);
1317
1318          if (_config->FindB("DPkg::FlushSTDIN",true) == true && isatty(STDIN_FILENO))
1319          {
1320             int Flags,dummy;
1321             if ((Flags = fcntl(STDIN_FILENO,F_GETFL,dummy)) < 0)
1322                _exit(100);
1323
1324             // Discard everything in stdin before forking dpkg
1325             if (fcntl(STDIN_FILENO,F_SETFL,Flags | O_NONBLOCK) < 0)
1326                _exit(100);
1327
1328             while (read(STDIN_FILENO,&dummy,1) == 1);
1329
1330             if (fcntl(STDIN_FILENO,F_SETFL,Flags & (~(long)O_NONBLOCK)) < 0)
1331                _exit(100);
1332          }
1333
1334          /* No Job Control Stop Env is a magic dpkg var that prevents it
1335             from using sigstop */
1336          putenv((char *)"DPKG_NO_TSTP=yes");
1337          execvp(Args[0], (char**) &Args[0]);
1338          cerr << "Could not exec dpkg!" << endl;
1339          _exit(100);
1340       }
1341
1342       // apply ionice
1343       if (_config->FindB("DPkg::UseIoNice", false) == true)
1344          ionice(Child);
1345
1346       // clear the Keep-Fd again
1347       _config->Clear("APT::Keep-Fds",fd[1]);
1348
1349       // Wait for dpkg
1350       int Status = 0;
1351
1352       // we read from dpkg here
1353       int const _dpkgin = fd[0];
1354       close(fd[1]);                        // close the write end of the pipe
1355
1356       if(slave > 0)
1357          close(slave);
1358
1359       // setups fds
1360       sigemptyset(&sigmask);
1361       sigprocmask(SIG_BLOCK,&sigmask,&original_sigmask);
1362
1363       /* free vectors (and therefore memory) as we don't need the included data anymore */
1364       for (std::vector<char *>::const_iterator p = Packages.begin();
1365            p != Packages.end(); ++p)
1366          free(*p);
1367       Packages.clear();
1368
1369       // the result of the waitpid call
1370       int res;
1371       int select_ret;
1372       while ((res=waitpid(Child,&Status, WNOHANG)) != Child) {
1373          if(res < 0) {
1374             // FIXME: move this to a function or something, looks ugly here
1375             // error handling, waitpid returned -1
1376             if (errno == EINTR)
1377                continue;
1378             RunScripts("DPkg::Post-Invoke");
1379
1380             // Restore sig int/quit
1381             signal(SIGQUIT,old_SIGQUIT);
1382             signal(SIGINT,old_SIGINT);
1383
1384             signal(SIGHUP,old_SIGHUP);
1385             return _error->Errno("waitpid","Couldn't wait for subprocess");
1386          }
1387
1388          // wait for input or output here
1389          FD_ZERO(&rfds);
1390          if (master >= 0 && !d->stdin_is_dev_null)
1391             FD_SET(0, &rfds);
1392          FD_SET(_dpkgin, &rfds);
1393          if(master >= 0)
1394             FD_SET(master, &rfds);
1395          tv.tv_sec = 1;
1396          tv.tv_nsec = 0;
1397          select_ret = pselect(max(master, _dpkgin)+1, &rfds, NULL, NULL,
1398                               &tv, &original_sigmask);
1399          if (select_ret < 0 && (errno == EINVAL || errno == ENOSYS))
1400             select_ret = racy_pselect(max(master, _dpkgin)+1, &rfds, NULL,
1401                                       NULL, &tv, &original_sigmask);
1402          if (select_ret == 0)
1403             continue;
1404          else if (select_ret < 0 && errno == EINTR)
1405             continue;
1406          else if (select_ret < 0)
1407          {
1408             perror("select() returned error");
1409             continue;
1410          }
1411
1412          if(master >= 0 && FD_ISSET(master, &rfds))
1413             DoTerminalPty(master);
1414          if(master >= 0 && FD_ISSET(0, &rfds))
1415             DoStdin(master);
1416          if(FD_ISSET(_dpkgin, &rfds))
1417             DoDpkgStatusFd(_dpkgin, OutStatusFd);
1418       }
1419       close(_dpkgin);
1420
1421       // Restore sig int/quit
1422       signal(SIGQUIT,old_SIGQUIT);
1423       signal(SIGINT,old_SIGINT);
1424
1425       signal(SIGHUP,old_SIGHUP);
1426
1427       if(master >= 0)
1428       {
1429          tcsetattr(0, TCSAFLUSH, &tt);
1430          close(master);
1431       }
1432
1433       // Check for an error code.
1434       if (WIFEXITED(Status) == 0 || WEXITSTATUS(Status) != 0)
1435       {
1436          // if it was set to "keep-dpkg-runing" then we won't return
1437          // here but keep the loop going and just report it as a error
1438          // for later
1439          bool const stopOnError = _config->FindB("Dpkg::StopOnError",true);
1440
1441          if(stopOnError)
1442             RunScripts("DPkg::Post-Invoke");
1443
1444          if (WIFSIGNALED(Status) != 0 && WTERMSIG(Status) == SIGSEGV)
1445             strprintf(d->dpkg_error, "Sub-process %s received a segmentation fault.",Args[0]);
1446          else if (WIFEXITED(Status) != 0)
1447             strprintf(d->dpkg_error, "Sub-process %s returned an error code (%u)",Args[0],WEXITSTATUS(Status));
1448          else
1449             strprintf(d->dpkg_error, "Sub-process %s exited unexpectedly",Args[0]);
1450
1451          if(d->dpkg_error.size() > 0)
1452             _error->Error("%s", d->dpkg_error.c_str());
1453
1454          if(stopOnError)
1455          {
1456             CloseLog();
1457             return false;
1458          }
1459       }
1460    }
1461    CloseLog();
1462
1463    if (pkgPackageManager::SigINTStop)
1464        _error->Warning(_("Operation was interrupted before it could finish"));
1465
1466    if (RunScripts("DPkg::Post-Invoke") == false)
1467       return false;
1468
1469    if (_config->FindB("Debug::pkgDPkgPM",false) == false)
1470    {
1471       std::string const oldpkgcache = _config->FindFile("Dir::cache::pkgcache");
1472       if (oldpkgcache.empty() == false && RealFileExists(oldpkgcache) == true &&
1473           unlink(oldpkgcache.c_str()) == 0)
1474       {
1475          std::string const srcpkgcache = _config->FindFile("Dir::cache::srcpkgcache");
1476          if (srcpkgcache.empty() == false && RealFileExists(srcpkgcache) == true)
1477          {
1478             _error->PushToStack();
1479             pkgCacheFile CacheFile;
1480             CacheFile.BuildCaches(NULL, true);
1481             _error->RevertToStack();
1482          }
1483       }
1484    }
1485
1486    Cache.writeStateFile(NULL);
1487    return true;
1488 }
1489
1490 void SigINT(int sig) {
1491    pkgPackageManager::SigINTStop = true;
1492 }
1493                                                                         /*}}}*/
1494 // pkgDpkgPM::Reset - Dump the contents of the command list             /*{{{*/
1495 // ---------------------------------------------------------------------
1496 /* */
1497 void pkgDPkgPM::Reset()
1498 {
1499    List.erase(List.begin(),List.end());
1500 }
1501                                                                         /*}}}*/
1502 // pkgDpkgPM::WriteApportReport - write out error report pkg failure    /*{{{*/
1503 // ---------------------------------------------------------------------
1504 /* */
1505 void pkgDPkgPM::WriteApportReport(const char *pkgpath, const char *errormsg)
1506 {
1507    // If apport doesn't exist or isn't installed do nothing
1508    // This e.g. prevents messages in 'universes' without apport
1509    pkgCache::PkgIterator apportPkg = Cache.FindPkg("apport");
1510    if (apportPkg.end() == true || apportPkg->CurrentVer == 0)
1511       return;
1512
1513    string pkgname, reportfile, srcpkgname, pkgver, arch;
1514    string::size_type pos;
1515    FILE *report;
1516
1517    if (_config->FindB("Dpkg::ApportFailureReport", false) == false)
1518    {
1519       std::clog << "configured to not write apport reports" << std::endl;
1520       return;
1521    }
1522
1523    // only report the first errors
1524    if(pkgFailures > _config->FindI("APT::Apport::MaxReports", 3))
1525    {
1526       std::clog << _("No apport report written because MaxReports is reached already") << std::endl;
1527       return;
1528    }
1529
1530    // check if its not a follow up error
1531    const char *needle = dgettext("dpkg", "dependency problems - leaving unconfigured");
1532    if(strstr(errormsg, needle) != NULL) {
1533       std::clog << _("No apport report written because the error message indicates its a followup error from a previous failure.") << std::endl;
1534       return;
1535    }
1536
1537    // do not report disk-full failures
1538    if(strstr(errormsg, strerror(ENOSPC)) != NULL) {
1539       std::clog << _("No apport report written because the error message indicates a disk full error") << std::endl;
1540       return;
1541    }
1542
1543    // do not report out-of-memory failures
1544    if(strstr(errormsg, strerror(ENOMEM)) != NULL) {
1545       std::clog << _("No apport report written because the error message indicates a out of memory error") << std::endl;
1546       return;
1547    }
1548
1549    // do not report dpkg I/O errors
1550    // XXX - this message is localized, but this only matches the English version.  This is better than nothing.
1551    if(strstr(errormsg, "short read in buffer_copy (")) {
1552       std::clog << _("No apport report written because the error message indicates a dpkg I/O error") << std::endl;
1553       return;
1554    }
1555
1556    // get the pkgname and reportfile
1557    pkgname = flNotDir(pkgpath);
1558    pos = pkgname.find('_');
1559    if(pos != string::npos)
1560       pkgname = pkgname.substr(0, pos);
1561
1562    // find the package versin and source package name
1563    pkgCache::PkgIterator Pkg = Cache.FindPkg(pkgname);
1564    if (Pkg.end() == true)
1565       return;
1566    pkgCache::VerIterator Ver = Cache.GetCandidateVer(Pkg);
1567    if (Ver.end() == true)
1568       return;
1569    pkgver = Ver.VerStr() == NULL ? "unknown" : Ver.VerStr();
1570    pkgRecords Recs(Cache);
1571    pkgRecords::Parser &Parse = Recs.Lookup(Ver.FileList());
1572    srcpkgname = Parse.SourcePkg();
1573    if(srcpkgname.empty())
1574       srcpkgname = pkgname;
1575
1576    // if the file exists already, we check:
1577    // - if it was reported already (touched by apport).
1578    //   If not, we do nothing, otherwise
1579    //    we overwrite it. This is the same behaviour as apport
1580    // - if we have a report with the same pkgversion already
1581    //   then we skip it
1582    reportfile = flCombine("/var/crash",pkgname+".0.crash");
1583    if(FileExists(reportfile))
1584    {
1585       struct stat buf;
1586       char strbuf[255];
1587
1588       // check atime/mtime
1589       stat(reportfile.c_str(), &buf);
1590       if(buf.st_mtime > buf.st_atime)
1591          return;
1592
1593       // check if the existing report is the same version
1594       report = fopen(reportfile.c_str(),"r");
1595       while(fgets(strbuf, sizeof(strbuf), report) != NULL)
1596       {
1597          if(strstr(strbuf,"Package:") == strbuf)
1598          {
1599             char pkgname[255], version[255];
1600             if(sscanf(strbuf, "Package: %254s %254s", pkgname, version) == 2)
1601                if(strcmp(pkgver.c_str(), version) == 0)
1602                {
1603                   fclose(report);
1604                   return;
1605                }
1606          }
1607       }
1608       fclose(report);
1609    }
1610
1611    // now write the report
1612    arch = _config->Find("APT::Architecture");
1613    report = fopen(reportfile.c_str(),"w");
1614    if(report == NULL)
1615       return;
1616    if(_config->FindB("DPkgPM::InitialReportOnly",false) == true)
1617       chmod(reportfile.c_str(), 0);
1618    else
1619       chmod(reportfile.c_str(), 0600);
1620    fprintf(report, "ProblemType: Package\n");
1621    fprintf(report, "Architecture: %s\n", arch.c_str());
1622    time_t now = time(NULL);
1623    fprintf(report, "Date: %s" , ctime(&now));
1624    fprintf(report, "Package: %s %s\n", pkgname.c_str(), pkgver.c_str());
1625    fprintf(report, "SourcePackage: %s\n", srcpkgname.c_str());
1626    fprintf(report, "ErrorMessage:\n %s\n", errormsg);
1627
1628    // ensure that the log is flushed
1629    if(d->term_out)
1630       fflush(d->term_out);
1631
1632    // attach terminal log it if we have it
1633    string logfile_name = _config->FindFile("Dir::Log::Terminal");
1634    if (!logfile_name.empty())
1635    {
1636       FILE *log = NULL;
1637
1638       fprintf(report, "DpkgTerminalLog:\n");
1639       log = fopen(logfile_name.c_str(),"r");
1640       if(log != NULL)
1641       {
1642          char buf[1024];
1643          while( fgets(buf, sizeof(buf), log) != NULL)
1644             fprintf(report, " %s", buf);
1645          fclose(log);
1646       }
1647    }
1648
1649    // log the ordering
1650    const char *ops_str[] = {"Install", "Configure","Remove","Purge"};
1651    fprintf(report, "AptOrdering:\n");
1652    for (vector<Item>::iterator I = List.begin(); I != List.end(); ++I)
1653       if ((*I).Pkg != NULL)
1654          fprintf(report, " %s: %s\n", (*I).Pkg.Name(), ops_str[(*I).Op]);
1655       else
1656          fprintf(report, " %s: %s\n", "NULL", ops_str[(*I).Op]);
1657
1658    // attach dmesg log (to learn about segfaults)
1659    if (FileExists("/bin/dmesg"))
1660    {
1661       fprintf(report, "Dmesg:\n");
1662       FILE *log = popen("/bin/dmesg","r");
1663       if(log != NULL)
1664       {
1665          char buf[1024];
1666          while( fgets(buf, sizeof(buf), log) != NULL)
1667             fprintf(report, " %s", buf);
1668          pclose(log);
1669       }
1670    }
1671
1672    // attach df -l log (to learn about filesystem status)
1673    if (FileExists("/bin/df"))
1674    {
1675
1676       fprintf(report, "Df:\n");
1677       FILE *log = popen("/bin/df -l","r");
1678       if(log != NULL)
1679       {
1680          char buf[1024];
1681          while( fgets(buf, sizeof(buf), log) != NULL)
1682             fprintf(report, " %s", buf);
1683          pclose(log);
1684       }
1685    }
1686
1687    fclose(report);
1688
1689 }
1690                                                                         /*}}}*/