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 <apt-pkg/dpkgpm.h>
  12 #include <apt-pkg/error.h>
  13 #include <apt-pkg/configuration.h>
  14 #include <apt-pkg/depcache.h>
  15 #include <apt-pkg/strutl.h>
  16 #include <apti18n.h>
  17
  18 #include <unistd.h>
  19 #include <stdlib.h>
  20 #include <fcntl.h>
  21 #include <sys/select.h>
  22 #include <sys/types.h>
  23 #include <sys/wait.h>
  24 #include <signal.h>
  25 #include <errno.h>
  26 #include <stdio.h>
  27 #include <sstream>
  28 #include <map>
  29
  30 #include <termios.h>
  31 #include <unistd.h>
  32 #include <sys/ioctl.h>
  33 #include <pty.h>
  34
  35 #include <config.h>
  36 #include <apti18n.h>
  37                                                                         /*}}}*/
  38
  39 using namespace std;
  40
  41
  42
  43 // DPkgPM::pkgDPkgPM - Constructor                                      /*{{{*/
  44 // ---------------------------------------------------------------------
  45 /* */
  46 pkgDPkgPM::pkgDPkgPM(pkgDepCache *Cache)
  47    : pkgPackageManager(Cache), dpkgbuf_pos(0),
  48      term_out(NULL), PackagesDone(0), PackagesTotal(0)
  49 {
  50 }
  51                                                                         /*}}}*/
  52 // DPkgPM::pkgDPkgPM - Destructor                                       /*{{{*/
  53 // ---------------------------------------------------------------------
  54 /* */
  55 pkgDPkgPM::~pkgDPkgPM()
  56 {
  57 }
  58                                                                         /*}}}*/
  59 // DPkgPM::Install - Install a package                                  /*{{{*/
  60 // ---------------------------------------------------------------------
  61 /* Add an install operation to the sequence list */
  62 bool pkgDPkgPM::Install(PkgIterator Pkg,string File)
  63 {
  64    if (File.empty() == true || Pkg.end() == true)
  65       return _error->Error("Internal Error, No file name for %s",Pkg.Name());
  66
  67    List.push_back(Item(Item::Install,Pkg,File));
  68    return true;
  69 }
  70                                                                         /*}}}*/
  71 // DPkgPM::Configure - Configure a package                              /*{{{*/
  72 // ---------------------------------------------------------------------
  73 /* Add a configure operation to the sequence list */
  74 bool pkgDPkgPM::Configure(PkgIterator Pkg)
  75 {
  76    if (Pkg.end() == true)
  77       return false;
  78
  79    List.push_back(Item(Item::Configure,Pkg));
  80    return true;
  81 }
  82                                                                         /*}}}*/
  83 // DPkgPM::Remove - Remove a package                                    /*{{{*/
  84 // ---------------------------------------------------------------------
  85 /* Add a remove operation to the sequence list */
  86 bool pkgDPkgPM::Remove(PkgIterator Pkg,bool Purge)
  87 {
  88    if (Pkg.end() == true)
  89       return false;
  90
  91    if (Purge == true)
  92       List.push_back(Item(Item::Purge,Pkg));
  93    else
  94       List.push_back(Item(Item::Remove,Pkg));
  95    return true;
  96 }
  97                                                                         /*}}}*/
  98 // DPkgPM::RunScripts - Run a set of scripts                            /*{{{*/
  99 // ---------------------------------------------------------------------
 100 /* This looks for a list of script sto run from the configuration file,
 101    each one is run with system from a forked child. */
 102 bool pkgDPkgPM::RunScripts(const char *Cnf)
 103 {
 104    Configuration::Item const *Opts = _config->Tree(Cnf);
 105    if (Opts == 0 || Opts->Child == 0)
 106       return true;
 107    Opts = Opts->Child;
 108
 109    // Fork for running the system calls
 110    pid_t Child = ExecFork();
 111
 112    // This is the child
 113    if (Child == 0)
 114    {
 115       if (chdir("/tmp/") != 0)
 116          _exit(100);
 117
 118       unsigned int Count = 1;
 119       for (; Opts != 0; Opts = Opts->Next, Count++)
 120       {
 121          if (Opts->Value.empty() == true)
 122             continue;
 123
 124          if (system(Opts->Value.c_str()) != 0)
 125             _exit(100+Count);
 126       }
 127       _exit(0);
 128    }
 129
 130    // Wait for the child
 131    int Status = 0;
 132    while (waitpid(Child,&Status,0) != Child)
 133    {
 134       if (errno == EINTR)
 135          continue;
 136       return _error->Errno("waitpid","Couldn't wait for subprocess");
 137    }
 138
 139    // Restore sig int/quit
 140    signal(SIGQUIT,SIG_DFL);
 141    signal(SIGINT,SIG_DFL);
 142
 143    // Check for an error code.
 144    if (WIFEXITED(Status) == 0 || WEXITSTATUS(Status) != 0)
 145    {
 146       unsigned int Count = WEXITSTATUS(Status);
 147       if (Count > 100)
 148       {
 149          Count -= 100;
 150          for (; Opts != 0 && Count != 1; Opts = Opts->Next, Count--);
 151          _error->Error("Problem executing scripts %s '%s'",Cnf,Opts->Value.c_str());
 152       }
 153
 154       return _error->Error("Sub-process returned an error code");
 155    }
 156
 157    return true;
 158 }
 159                                                                         /*}}}*/
 160 // DPkgPM::SendV2Pkgs - Send version 2 package info                     /*{{{*/
 161 // ---------------------------------------------------------------------
 162 /* This is part of the helper script communication interface, it sends
 163    very complete information down to the other end of the pipe.*/
 164 bool pkgDPkgPM::SendV2Pkgs(FILE *F)
 165 {
 166    fprintf(F,"VERSION 2\n");
 167
 168    /* Write out all of the configuration directives by walking the
 169       configuration tree */
 170    const Configuration::Item *Top = _config->Tree(0);
 171    for (; Top != 0;)
 172    {
 173       if (Top->Value.empty() == false)
 174       {
 175          fprintf(F,"%s=%s\n",
 176                  QuoteString(Top->FullTag(),"=\"\n").c_str(),
 177                  QuoteString(Top->Value,"\n").c_str());
 178       }
 179
 180       if (Top->Child != 0)
 181       {
 182          Top = Top->Child;
 183          continue;
 184       }
 185
 186       while (Top != 0 && Top->Next == 0)
 187          Top = Top->Parent;
 188       if (Top != 0)
 189          Top = Top->Next;
 190    }
 191    fprintf(F,"\n");
 192
 193    // Write out the package actions in order.
 194    for (vector<Item>::iterator I = List.begin(); I != List.end(); I++)
 195    {
 196       pkgDepCache::StateCache &S = Cache[I->Pkg];
 197
 198       fprintf(F,"%s ",I->Pkg.Name());
 199       // Current version
 200       if (I->Pkg->CurrentVer == 0)
 201          fprintf(F,"- ");
 202       else
 203          fprintf(F,"%s ",I->Pkg.CurrentVer().VerStr());
 204
 205       // Show the compare operator
 206       // Target version
 207       if (S.InstallVer != 0)
 208       {
 209          int Comp = 2;
 210          if (I->Pkg->CurrentVer != 0)
 211             Comp = S.InstVerIter(Cache).CompareVer(I->Pkg.CurrentVer());
 212          if (Comp < 0)
 213             fprintf(F,"> ");
 214          if (Comp == 0)
 215             fprintf(F,"= ");
 216          if (Comp > 0)
 217             fprintf(F,"< ");
 218          fprintf(F,"%s ",S.InstVerIter(Cache).VerStr());
 219       }
 220       else
 221          fprintf(F,"> - ");
 222
 223       // Show the filename/operation
 224       if (I->Op == Item::Install)
 225       {
 226          // No errors here..
 227          if (I->File[0] != '/')
 228             fprintf(F,"**ERROR**\n");
 229          else
 230             fprintf(F,"%s\n",I->File.c_str());
 231       }
 232       if (I->Op == Item::Configure)
 233          fprintf(F,"**CONFIGURE**\n");
 234       if (I->Op == Item::Remove ||
 235           I->Op == Item::Purge)
 236          fprintf(F,"**REMOVE**\n");
 237
 238       if (ferror(F) != 0)
 239          return false;
 240    }
 241    return true;
 242 }
 243                                                                         /*}}}*/
 244 // DPkgPM::RunScriptsWithPkgs - Run scripts with package names on stdin /*{{{*/
 245 // ---------------------------------------------------------------------
 246 /* This looks for a list of scripts to run from the configuration file
 247    each one is run and is fed on standard input a list of all .deb files
 248    that are due to be installed. */
 249 bool pkgDPkgPM::RunScriptsWithPkgs(const char *Cnf)
 250 {
 251    Configuration::Item const *Opts = _config->Tree(Cnf);
 252    if (Opts == 0 || Opts->Child == 0)
 253       return true;
 254    Opts = Opts->Child;
 255
 256    unsigned int Count = 1;
 257    for (; Opts != 0; Opts = Opts->Next, Count++)
 258    {
 259       if (Opts->Value.empty() == true)
 260          continue;
 261
 262       // Determine the protocol version
 263       string OptSec = Opts->Value;
 264       string::size_type Pos;
 265       if ((Pos = OptSec.find(' ')) == string::npos || Pos == 0)
 266          Pos = OptSec.length();
 267       OptSec = "DPkg::Tools::Options::" + string(Opts->Value.c_str(),Pos);
 268
 269       unsigned int Version = _config->FindI(OptSec+"::Version",1);
 270
 271       // Create the pipes
 272       int Pipes[2];
 273       if (pipe(Pipes) != 0)
 274          return _error->Errno("pipe","Failed to create IPC pipe to subprocess");
 275       SetCloseExec(Pipes[0],true);
 276       SetCloseExec(Pipes[1],true);
 277
 278       // Purified Fork for running the script
 279       pid_t Process = ExecFork();
 280       if (Process == 0)
 281       {
 282          // Setup the FDs
 283          dup2(Pipes[0],STDIN_FILENO);
 284          SetCloseExec(STDOUT_FILENO,false);
 285          SetCloseExec(STDIN_FILENO,false);
 286          SetCloseExec(STDERR_FILENO,false);
 287
 288          const char *Args[4];
 289          Args[0] = "/bin/sh";
 290          Args[1] = "-c";
 291          Args[2] = Opts->Value.c_str();
 292          Args[3] = 0;
 293          execv(Args[0],(char **)Args);
 294          _exit(100);
 295       }
 296       close(Pipes[0]);
 297       FILE *F = fdopen(Pipes[1],"w");
 298       if (F == 0)
 299          return _error->Errno("fdopen","Faild to open new FD");
 300
 301       // Feed it the filenames.
 302       bool Die = false;
 303       if (Version <= 1)
 304       {
 305          for (vector<Item>::iterator I = List.begin(); I != List.end(); I++)
 306          {
 307             // Only deal with packages to be installed from .deb
 308             if (I->Op != Item::Install)
 309                continue;
 310
 311             // No errors here..
 312             if (I->File[0] != '/')
 313                continue;
 314
 315             /* Feed the filename of each package that is pending install
 316                into the pipe. */
 317             fprintf(F,"%s\n",I->File.c_str());
 318             if (ferror(F) != 0)
 319             {
 320                Die = true;
 321                break;
 322             }
 323          }
 324       }
 325       else
 326          Die = !SendV2Pkgs(F);
 327
 328       fclose(F);
 329
 330       // Clean up the sub process
 331       if (ExecWait(Process,Opts->Value.c_str()) == false)
 332          return _error->Error("Failure running script %s",Opts->Value.c_str());
 333    }
 334
 335    return true;
 336 }
 337
 338                                                                         /*}}}*/
 339 // DPkgPM::DoStdin - Read stdin and pass to slave pty                   /*{{{*/
 340 // ---------------------------------------------------------------------
 341 /*
 342 */
 343 void pkgDPkgPM::DoStdin(int master)
 344 {
 345    char input_buf[256] = {0,};
 346    int len = read(0, input_buf, sizeof(input_buf));
 347    write(master, input_buf, len);
 348 }
 349                                                                         /*}}}*/
 350 // DPkgPM::DoTerminalPty - Read the terminal pty and write log          /*{{{*/
 351 // ---------------------------------------------------------------------
 352 /*
 353  * read the terminal pty and write log
 354  */
 355 void pkgDPkgPM::DoTerminalPty(int master)
 356 {
 357    char term_buf[1024] = {0,};
 358
 359    int len=read(master, term_buf, sizeof(term_buf));
 360    if(len == -1 && errno == EIO)
 361    {
 362       // this happens when the child is about to exit, we
 363       // give it time to actually exit, otherwise we run
 364       // into a race
 365       usleep(500000);
 366       return;
 367    }
 368    if(len <= 0)
 369       return;
 370    write(1, term_buf, len);
 371    if(term_out)
 372       fwrite(term_buf, len, sizeof(char), term_out);
 373 }
 374                                                                         /*}}}*/
 375 // DPkgPM::ProcessDpkgStatusBuf                                         /*{{{*/
 376 // ---------------------------------------------------------------------
 377 /*
 378  */
 379 void pkgDPkgPM::ProcessDpkgStatusLine(int OutStatusFd, char *line)
 380 {
 381    // the status we output
 382    ostringstream status;
 383
 384    if (_config->FindB("Debug::pkgDPkgProgressReporting",false) == true)
 385       std::clog << "got from dpkg '" << line << "'" << std::endl;
 386
 387
 388    /* dpkg sends strings like this:
 389       'status:   <pkg>:  <pkg  qstate>'
 390       errors look like this:
 391       '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
 392       and conffile-prompt like this
 393       'status: conffile-prompt: conffile : 'current-conffile' 'new-conffile' useredited distedited
 394
 395    */
 396    char* list[5];
 397    //        dpkg sends multiline error messages sometimes (see
 398    //        #374195 for a example. we should support this by
 399    //        either patching dpkg to not send multiline over the
 400    //        statusfd or by rewriting the code here to deal with
 401    //        it. for now we just ignore it and not crash
 402    TokSplitString(':', line, list, sizeof(list)/sizeof(list[0]));
 403    if( list[0] == NULL || list[1] == NULL || list[2] == NULL)
 404    {
 405       if (_config->FindB("Debug::pkgDPkgProgressReporting",false) == true)
 406          std::clog << "ignoring line: not enough ':'" << std::endl;
 407       return;
 408    }
 409    char *pkg = list[1];
 410    char *action = _strstrip(list[2]);
 411
 412    if(strncmp(action,"error",strlen("error")) == 0)
 413    {
 414       status << "pmerror:" << list[1]
 415              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 416              << ":" << list[3]
 417              << endl;
 418       if(OutStatusFd > 0)
 419          write(OutStatusFd, status.str().c_str(), status.str().size());
 420       if (_config->FindB("Debug::pkgDPkgProgressReporting",false) == true)
 421          std::clog << "send: '" << status.str() << "'" << endl;
 422       return;
 423    }
 424    if(strncmp(action,"conffile",strlen("conffile")) == 0)
 425    {
 426       status << "pmconffile:" << list[1]
 427              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 428              << ":" << list[3]
 429              << endl;
 430       if(OutStatusFd > 0)
 431          write(OutStatusFd, status.str().c_str(), status.str().size());
 432       if (_config->FindB("Debug::pkgDPkgProgressReporting",false) == true)
 433          std::clog << "send: '" << status.str() << "'" << endl;
 434       return;
 435    }
 436
 437    vector<struct DpkgState> &states = PackageOps[pkg];
 438    const char *next_action = NULL;
 439    if(PackageOpsDone[pkg] < states.size())
 440       next_action = states[PackageOpsDone[pkg]].state;
 441    // check if the package moved to the next dpkg state
 442    if(next_action && (strcmp(action, next_action) == 0))
 443    {
 444       // only read the translation if there is actually a next
 445       // action
 446       const char *translation = _(states[PackageOpsDone[pkg]].str);
 447       char s[200];
 448       snprintf(s, sizeof(s), translation, pkg);
 449
 450       // we moved from one dpkg state to a new one, report that
 451       PackageOpsDone[pkg]++;
 452       PackagesDone++;
 453       // build the status str
 454       status << "pmstatus:" << pkg
 455              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 456              << ":" << s
 457              << endl;
 458       if(OutStatusFd > 0)
 459          write(OutStatusFd, status.str().c_str(), status.str().size());
 460       if (_config->FindB("Debug::pkgDPkgProgressReporting",false) == true)
 461          std::clog << "send: '" << status.str() << "'" << endl;
 462    }
 463    if (_config->FindB("Debug::pkgDPkgProgressReporting",false) == true)
 464       std::clog << "(parsed from dpkg) pkg: " << pkg
 465                 << " action: " << action << endl;
 466 }
 467
 468 // DPkgPM::DoDpkgStatusFd                                               /*{{{*/
 469 // ---------------------------------------------------------------------
 470 /*
 471  */
 472 void pkgDPkgPM::DoDpkgStatusFd(int statusfd, int OutStatusFd)
 473 {
 474    char *p, *q;
 475    int len;
 476
 477    len=read(statusfd, &dpkgbuf[dpkgbuf_pos], sizeof(dpkgbuf)-dpkgbuf_pos);
 478    dpkgbuf_pos += len;
 479    if(len <= 0)
 480       return;
 481
 482    // process line by line if we have a buffer
 483    p = q = dpkgbuf;
 484    while((q=(char*)memchr(p, '\n', dpkgbuf+dpkgbuf_pos-p)) != NULL)
 485    {
 486       *q = 0;
 487       ProcessDpkgStatusLine(OutStatusFd, p);
 488       p=q+1; // continue with next line
 489    }
 490
 491    // now move the unprocessed bits (after the final \n that is now a 0x0)
 492    // to the start and update dpkgbuf_pos
 493    p = (char*)memrchr(dpkgbuf, 0, dpkgbuf_pos);
 494    if(p == NULL)
 495       return;
 496
 497    // we are interessted in the first char *after* 0x0
 498    p++;
 499
 500    // move the unprocessed tail to the start and update pos
 501    memmove(dpkgbuf, p, p-dpkgbuf);
 502    dpkgbuf_pos = dpkgbuf+dpkgbuf_pos-p;
 503 }
 504                                                                         /*}}}*/
 505
 506 bool pkgDPkgPM::OpenLog()
 507 {
 508    string logdir = _config->FindDir("Dir::Log");
 509    if(not FileExists(logdir))
 510       return _error->Error(_("Directory '%s' missing"), logdir.c_str());
 511    string logfile_name = flCombine(logdir,
 512                                    _config->Find("Dir::Log::Terminal"));
 513    if (!logfile_name.empty())
 514    {
 515       term_out = fopen(logfile_name.c_str(),"a");
 516       chmod(logfile_name.c_str(), 0600);
 517       // output current time
 518       char outstr[200];
 519       time_t t = time(NULL);
 520       struct tm *tmp = localtime(&t);
 521       strftime(outstr, sizeof(outstr), "%F  %T", tmp);
 522       fprintf(term_out, "\nLog started: ");
 523       fprintf(term_out, outstr);
 524       fprintf(term_out, "\n");
 525    }
 526    return true;
 527 }
 528
 529 bool pkgDPkgPM::CloseLog()
 530 {
 531    if(term_out)
 532    {
 533       char outstr[200];
 534       time_t t = time(NULL);
 535       struct tm *tmp = localtime(&t);
 536       strftime(outstr, sizeof(outstr), "%F  %T", tmp);
 537       fprintf(term_out, "Log ended: ");
 538       fprintf(term_out, outstr);
 539       fprintf(term_out, "\n");
 540       fclose(term_out);
 541    }
 542    term_out = NULL;
 543    return true;
 544 }
 545
 546 /*{{{*/
 547 // This implements a racy version of pselect for those architectures
 548 // that don't have a working implementation.
 549 // FIXME: Probably can be removed on Lenny+1
 550 static int racy_pselect(int nfds, fd_set *readfds, fd_set *writefds,
 551    fd_set *exceptfds, const struct timespec *timeout,
 552    const sigset_t *sigmask)
 553 {
 554    sigset_t origmask;
 555    struct timeval tv;
 556    int retval;
 557
 558    tv.tv_sec = timeout->tv.tv_sec;
 559    tv.tv_usec = timeout->tv.tv_nsec/1000;
 560
 561    sigprocmask(SIG_SETMASK, &sigmask, &origmask);
 562    retval = select(nfds, readfds, writefds, exceptfds, &tv);
 563    sigprocmask(SIG_SETMASK, &origmask, 0);
 564    return retval;
 565 }
 566 /*}}}*/
 567
 568 // DPkgPM::Go - Run the sequence                                        /*{{{*/
 569 // ---------------------------------------------------------------------
 570 /* This globs the operations and calls dpkg
 571  *
 572  * If it is called with "OutStatusFd" set to a valid file descriptor
 573  * apt will report the install progress over this fd. It maps the
 574  * dpkg states a package goes through to human readable (and i10n-able)
 575  * names and calculates a percentage for each step.
 576 */
 577 bool pkgDPkgPM::Go(int OutStatusFd)
 578 {
 579    unsigned int MaxArgs = _config->FindI("Dpkg::MaxArgs",8*1024);
 580    unsigned int MaxArgBytes = _config->FindI("Dpkg::MaxArgBytes",32*1024);
 581
 582    if (RunScripts("DPkg::Pre-Invoke") == false)
 583       return false;
 584
 585    if (RunScriptsWithPkgs("DPkg::Pre-Install-Pkgs") == false)
 586       return false;
 587
 588    // map the dpkg states to the operations that are performed
 589    // (this is sorted in the same way as Item::Ops)
 590    static const struct DpkgState DpkgStatesOpMap[][7] = {
 591       // Install operation
 592       {
 593          {"half-installed", N_("Preparing %s")},
 594          {"unpacked", N_("Unpacking %s") },
 595          {NULL, NULL}
 596       },
 597       // Configure operation
 598       {
 599          {"unpacked",N_("Preparing to configure %s") },
 600          {"half-configured", N_("Configuring %s") },
 601 #if 0
 602          {"triggers-awaited", N_("Processing triggers for %s") },
 603          {"triggers-pending", N_("Processing triggers for %s") },
 604 #endif
 605          { "installed", N_("Installed %s")},
 606          {NULL, NULL}
 607       },
 608       // Remove operation
 609       {
 610          {"half-configured", N_("Preparing for removal of %s")},
 611 #if 0
 612          {"triggers-awaited", N_("Preparing for removal of %s")},
 613          {"triggers-pending", N_("Preparing for removal of %s")},
 614 #endif
 615          {"half-installed", N_("Removing %s")},
 616          {"config-files",  N_("Removed %s")},
 617          {NULL, NULL}
 618       },
 619       // Purge operation
 620       {
 621          {"config-files", N_("Preparing to completely remove %s")},
 622          {"not-installed", N_("Completely removed %s")},
 623          {NULL, NULL}
 624       },
 625    };
 626
 627    // init the PackageOps map, go over the list of packages that
 628    // that will be [installed|configured|removed|purged] and add
 629    // them to the PackageOps map (the dpkg states it goes through)
 630    // and the PackageOpsTranslations (human readable strings)
 631    for (vector<Item>::iterator I = List.begin(); I != List.end();I++)
 632    {
 633       string name = (*I).Pkg.Name();
 634       PackageOpsDone[name] = 0;
 635       for(int i=0; (DpkgStatesOpMap[(*I).Op][i]).state != NULL;  i++)
 636       {
 637          PackageOps[name].push_back(DpkgStatesOpMap[(*I).Op][i]);
 638          PackagesTotal++;
 639       }
 640    }
 641
 642    // create log
 643    OpenLog();
 644
 645    // this loop is runs once per operation
 646    for (vector<Item>::iterator I = List.begin(); I != List.end();)
 647    {
 648       vector<Item>::iterator J = I;
 649       for (; J != List.end() && J->Op == I->Op; J++);
 650
 651       // Generate the argument list
 652       const char *Args[MaxArgs + 50];
 653       if (J - I > (signed)MaxArgs)
 654          J = I + MaxArgs;
 655
 656       unsigned int n = 0;
 657       unsigned long Size = 0;
 658       string Tmp = _config->Find("Dir::Bin::dpkg","dpkg");
 659       Args[n++] = Tmp.c_str();
 660       Size += strlen(Args[n-1]);
 661
 662       // Stick in any custom dpkg options
 663       Configuration::Item const *Opts = _config->Tree("DPkg::Options");
 664       if (Opts != 0)
 665       {
 666          Opts = Opts->Child;
 667          for (; Opts != 0; Opts = Opts->Next)
 668          {
 669             if (Opts->Value.empty() == true)
 670                continue;
 671             Args[n++] = Opts->Value.c_str();
 672             Size += Opts->Value.length();
 673          }
 674       }
 675
 676       char status_fd_buf[20];
 677       int fd[2];
 678       pipe(fd);
 679
 680       Args[n++] = "--status-fd";
 681       Size += strlen(Args[n-1]);
 682       snprintf(status_fd_buf,sizeof(status_fd_buf),"%i", fd[1]);
 683       Args[n++] = status_fd_buf;
 684       Size += strlen(Args[n-1]);
 685
 686       switch (I->Op)
 687       {
 688          case Item::Remove:
 689          Args[n++] = "--force-depends";
 690          Size += strlen(Args[n-1]);
 691          Args[n++] = "--force-remove-essential";
 692          Size += strlen(Args[n-1]);
 693          Args[n++] = "--remove";
 694          Size += strlen(Args[n-1]);
 695          break;
 696
 697          case Item::Purge:
 698          Args[n++] = "--force-depends";
 699          Size += strlen(Args[n-1]);
 700          Args[n++] = "--force-remove-essential";
 701          Size += strlen(Args[n-1]);
 702          Args[n++] = "--purge";
 703          Size += strlen(Args[n-1]);
 704          break;
 705
 706          case Item::Configure:
 707          Args[n++] = "--configure";
 708          Size += strlen(Args[n-1]);
 709          break;
 710
 711          case Item::Install:
 712          Args[n++] = "--unpack";
 713          Size += strlen(Args[n-1]);
 714          Args[n++] = "--auto-deconfigure";
 715          Size += strlen(Args[n-1]);
 716          break;
 717       }
 718
 719       // Write in the file or package names
 720       if (I->Op == Item::Install)
 721       {
 722          for (;I != J && Size < MaxArgBytes; I++)
 723          {
 724             if (I->File[0] != '/')
 725                return _error->Error("Internal Error, Pathname to install is not absolute '%s'",I->File.c_str());
 726             Args[n++] = I->File.c_str();
 727             Size += strlen(Args[n-1]);
 728          }
 729       }
 730       else
 731       {
 732          for (;I != J && Size < MaxArgBytes; I++)
 733          {
 734             Args[n++] = I->Pkg.Name();
 735             Size += strlen(Args[n-1]);
 736          }
 737       }
 738       Args[n] = 0;
 739       J = I;
 740
 741       if (_config->FindB("Debug::pkgDPkgPM",false) == true)
 742       {
 743          for (unsigned int k = 0; k != n; k++)
 744             clog << Args[k] << ' ';
 745          clog << endl;
 746          continue;
 747       }
 748
 749       cout << flush;
 750       clog << flush;
 751       cerr << flush;
 752
 753       /* Mask off sig int/quit. We do this because dpkg also does when
 754          it forks scripts. What happens is that when you hit ctrl-c it sends
 755          it to all processes in the group. Since dpkg ignores the signal
 756          it doesn't die but we do! So we must also ignore it */
 757       sighandler_t old_SIGQUIT = signal(SIGQUIT,SIG_IGN);
 758       sighandler_t old_SIGINT = signal(SIGINT,SIG_IGN);
 759
 760       struct    termios tt;
 761       struct    winsize win;
 762       int       master;
 763       int       slave;
 764
 765       // FIXME: setup sensible signal handling (*ick*)
 766       tcgetattr(0, &tt);
 767       ioctl(0, TIOCGWINSZ, (char *)&win);
 768       if (openpty(&master, &slave, NULL, &tt, &win) < 0)
 769       {
 770          const char *s = _("Can not write log, openpty() "
 771                            "failed (/dev/pts not mounted?)\n");
 772          fprintf(stderr, "%s",s);
 773          fprintf(term_out, "%s",s);
 774          master = slave = -1;
 775       }  else {
 776          struct termios rtt;
 777          rtt = tt;
 778          cfmakeraw(&rtt);
 779          rtt.c_lflag &= ~ECHO;
 780          tcsetattr(0, TCSAFLUSH, &rtt);
 781       }
 782
 783        // Fork dpkg
 784       pid_t Child;
 785       _config->Set("APT::Keep-Fds::",fd[1]);
 786       Child = ExecFork();
 787
 788       // This is the child
 789       if (Child == 0)
 790       {
 791          if(slave >= 0 && master >= 0)
 792          {
 793             setsid();
 794             ioctl(slave, TIOCSCTTY, 0);
 795             close(master);
 796             dup2(slave, 0);
 797             dup2(slave, 1);
 798             dup2(slave, 2);
 799             close(slave);
 800          }
 801          close(fd[0]); // close the read end of the pipe
 802
 803          if (chdir(_config->FindDir("DPkg::Run-Directory","/").c_str()) != 0)
 804             _exit(100);
 805
 806          if (_config->FindB("DPkg::FlushSTDIN",true) == true && isatty(STDIN_FILENO))
 807          {
 808             int Flags,dummy;
 809             if ((Flags = fcntl(STDIN_FILENO,F_GETFL,dummy)) < 0)
 810                _exit(100);
 811
 812             // Discard everything in stdin before forking dpkg
 813             if (fcntl(STDIN_FILENO,F_SETFL,Flags | O_NONBLOCK) < 0)
 814                _exit(100);
 815
 816             while (read(STDIN_FILENO,&dummy,1) == 1);
 817
 818             if (fcntl(STDIN_FILENO,F_SETFL,Flags & (~(long)O_NONBLOCK)) < 0)
 819                _exit(100);
 820          }
 821
 822
 823          /* No Job Control Stop Env is a magic dpkg var that prevents it
 824             from using sigstop */
 825          putenv((char *)"DPKG_NO_TSTP=yes");
 826          execvp(Args[0],(char **)Args);
 827          cerr << "Could not exec dpkg!" << endl;
 828          _exit(100);
 829       }
 830
 831       // clear the Keep-Fd again
 832       _config->Clear("APT::Keep-Fds",fd[1]);
 833
 834       // Wait for dpkg
 835       int Status = 0;
 836
 837       // we read from dpkg here
 838       int _dpkgin = fd[0];
 839       close(fd[1]);                        // close the write end of the pipe
 840
 841       // the result of the waitpid call
 842       int res;
 843       if(slave > 0)
 844          close(slave);
 845
 846       // setups fds
 847       fd_set rfds;
 848       struct timespec tv;
 849       sigset_t sigmask;
 850       sigset_t original_sigmask;
 851       sigemptyset(&sigmask);
 852       sigprocmask(SIG_BLOCK,&sigmask,&original_sigmask);
 853
 854       int select_ret;
 855       while ((res=waitpid(Child,&Status, WNOHANG)) != Child) {
 856          if(res < 0) {
 857             // FIXME: move this to a function or something, looks ugly here
 858             // error handling, waitpid returned -1
 859             if (errno == EINTR)
 860                continue;
 861             RunScripts("DPkg::Post-Invoke");
 862
 863             // Restore sig int/quit
 864             signal(SIGQUIT,old_SIGQUIT);
 865             signal(SIGINT,old_SIGINT);
 866             return _error->Errno("waitpid","Couldn't wait for subprocess");
 867          }
 868
 869          // wait for input or output here
 870          FD_ZERO(&rfds);
 871          FD_SET(0, &rfds);
 872          FD_SET(_dpkgin, &rfds);
 873          if(master >= 0)
 874             FD_SET(master, &rfds);
 875          tv.tv_sec = 1;
 876          tv.tv_nsec = 0;
 877          select_ret = pselect(max(master, _dpkgin)+1, &rfds, NULL, NULL,
 878                               &tv, &original_sigmask);
 879          if (select_ret < 0 && (errno == EINVAL || errno == ENOSYS))
 880             select_ret = racy_pselect(max(master, _dpkgin)+1, &rfds, NULL,
 881                                       NULL, &tv, &original_sigmask);
 882          if (select_ret == 0)
 883             continue;
 884          else if (select_ret < 0 && errno == EINTR)
 885             continue;
 886          else if (select_ret < 0)
 887          {
 888             perror("select() returned error");
 889             continue;
 890          }
 891
 892          if(master >= 0 && FD_ISSET(master, &rfds))
 893             DoTerminalPty(master);
 894          if(master >= 0 && FD_ISSET(0, &rfds))
 895             DoStdin(master);
 896          if(FD_ISSET(_dpkgin, &rfds))
 897             DoDpkgStatusFd(_dpkgin, OutStatusFd);
 898       }
 899       close(_dpkgin);
 900
 901       // Restore sig int/quit
 902       signal(SIGQUIT,old_SIGQUIT);
 903       signal(SIGINT,old_SIGINT);
 904
 905       if(master >= 0)
 906       {
 907          tcsetattr(0, TCSAFLUSH, &tt);
 908          close(master);
 909       }
 910
 911       // Check for an error code.
 912       if (WIFEXITED(Status) == 0 || WEXITSTATUS(Status) != 0)
 913       {
 914          // if it was set to "keep-dpkg-runing" then we won't return
 915          // here but keep the loop going and just report it as a error
 916          // for later
 917          bool stopOnError = _config->FindB("Dpkg::StopOnError",true);
 918
 919          if(stopOnError)
 920             RunScripts("DPkg::Post-Invoke");
 921
 922          if (WIFSIGNALED(Status) != 0 && WTERMSIG(Status) == SIGSEGV)
 923             _error->Error("Sub-process %s received a segmentation fault.",Args[0]);
 924          else if (WIFEXITED(Status) != 0)
 925             _error->Error("Sub-process %s returned an error code (%u)",Args[0],WEXITSTATUS(Status));
 926          else
 927             _error->Error("Sub-process %s exited unexpectedly",Args[0]);
 928
 929          if(stopOnError)
 930          {
 931             CloseLog();
 932             return false;
 933          }
 934       }
 935    }
 936    CloseLog();
 937
 938    if (RunScripts("DPkg::Post-Invoke") == false)
 939       return false;
 940    return true;
 941 }
 942                                                                         /*}}}*/
 943 // pkgDpkgPM::Reset - Dump the contents of the command list             /*{{{*/
 944 // ---------------------------------------------------------------------
 945 /* */
 946 void pkgDPkgPM::Reset()
 947 {
 948    List.erase(List.begin(),List.end());
 949 }
 950                                                                         /*}}}*/