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