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 <= 0)
 361       return;
 362    write(1, term_buf, len);
 363    if(term_out)
 364       fwrite(term_buf, len, sizeof(char), term_out);
 365 }
 366                                                                         /*}}}*/
 367 // DPkgPM::ProcessDpkgStatusBuf                                         /*{{{*/
 368 // ---------------------------------------------------------------------
 369 /*
 370  */
 371 void pkgDPkgPM::ProcessDpkgStatusLine(int OutStatusFd, char *line)
 372 {
 373    // the status we output
 374    ostringstream status;
 375
 376    if (_config->FindB("Debug::pkgDPkgProgressReporting",false) == true)
 377       std::clog << "got from dpkg '" << line << "'" << std::endl;
 378
 379
 380    /* dpkg sends strings like this:
 381       'status:   <pkg>:  <pkg  qstate>'
 382       errors look like this:
 383       '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
 384       and conffile-prompt like this
 385       'status: conffile-prompt: conffile : 'current-conffile' 'new-conffile' useredited distedited
 386
 387    */
 388    char* list[5];
 389    //        dpkg sends multiline error messages sometimes (see
 390    //        #374195 for a example. we should support this by
 391    //        either patching dpkg to not send multiline over the
 392    //        statusfd or by rewriting the code here to deal with
 393    //        it. for now we just ignore it and not crash
 394    TokSplitString(':', line, list, sizeof(list)/sizeof(list[0]));
 395    if( list[0] == NULL || list[1] == NULL || list[2] == NULL)
 396    {
 397       if (_config->FindB("Debug::pkgDPkgProgressReporting",false) == true)
 398          std::clog << "ignoring line: not enough ':'" << std::endl;
 399       return;
 400    }
 401    char *pkg = list[1];
 402    char *action = _strstrip(list[2]);
 403
 404    if(strncmp(action,"error",strlen("error")) == 0)
 405    {
 406       status << "pmerror:" << list[1]
 407              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 408              << ":" << list[3]
 409              << endl;
 410       if(OutStatusFd > 0)
 411          write(OutStatusFd, status.str().c_str(), status.str().size());
 412       if (_config->FindB("Debug::pkgDPkgProgressReporting",false) == true)
 413          std::clog << "send: '" << status.str() << "'" << endl;
 414       return;
 415    }
 416    if(strncmp(action,"conffile",strlen("conffile")) == 0)
 417    {
 418       status << "pmconffile:" << list[1]
 419              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 420              << ":" << list[3]
 421              << endl;
 422       if(OutStatusFd > 0)
 423          write(OutStatusFd, status.str().c_str(), status.str().size());
 424       if (_config->FindB("Debug::pkgDPkgProgressReporting",false) == true)
 425          std::clog << "send: '" << status.str() << "'" << endl;
 426       return;
 427    }
 428
 429    vector<struct DpkgState> &states = PackageOps[pkg];
 430    const char *next_action = NULL;
 431    if(PackageOpsDone[pkg] < states.size())
 432       next_action = states[PackageOpsDone[pkg]].state;
 433    // check if the package moved to the next dpkg state
 434    if(next_action && (strcmp(action, next_action) == 0))
 435    {
 436       // only read the translation if there is actually a next
 437       // action
 438       const char *translation = _(states[PackageOpsDone[pkg]].str);
 439       char s[200];
 440       snprintf(s, sizeof(s), translation, pkg);
 441
 442       // we moved from one dpkg state to a new one, report that
 443       PackageOpsDone[pkg]++;
 444       PackagesDone++;
 445       // build the status str
 446       status << "pmstatus:" << pkg
 447              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 448              << ":" << s
 449              << endl;
 450       if(OutStatusFd > 0)
 451          write(OutStatusFd, status.str().c_str(), status.str().size());
 452       if (_config->FindB("Debug::pkgDPkgProgressReporting",false) == true)
 453          std::clog << "send: '" << status.str() << "'" << endl;
 454    }
 455    if (_config->FindB("Debug::pkgDPkgProgressReporting",false) == true)
 456       std::clog << "(parsed from dpkg) pkg: " << pkg
 457                 << " action: " << action << endl;
 458 }
 459
 460 // DPkgPM::DoDpkgStatusFd                                               /*{{{*/
 461 // ---------------------------------------------------------------------
 462 /*
 463  */
 464 void pkgDPkgPM::DoDpkgStatusFd(int statusfd, int OutStatusFd)
 465 {
 466    char *p, *q;
 467    int len;
 468
 469    len=read(statusfd, &dpkgbuf[dpkgbuf_pos], sizeof(dpkgbuf)-dpkgbuf_pos);
 470    dpkgbuf_pos += len;
 471    if(len <= 0)
 472       return;
 473
 474    // process line by line if we have a buffer
 475    p = q = dpkgbuf;
 476    while((q=(char*)memchr(p, '\n', dpkgbuf+dpkgbuf_pos-p)) != NULL)
 477    {
 478       *q = 0;
 479       ProcessDpkgStatusLine(OutStatusFd, p);
 480       p=q+1; // continue with next line
 481    }
 482
 483    // now move the unprocessed bits (after the final \n that is now a 0x0)
 484    // to the start and update dpkgbuf_pos
 485    p = (char*)memrchr(dpkgbuf, 0, dpkgbuf_pos);
 486    if(p == NULL)
 487       return;
 488
 489    // we are interessted in the first char *after* 0x0
 490    p++;
 491
 492    // move the unprocessed tail to the start and update pos
 493    memmove(dpkgbuf, p, p-dpkgbuf);
 494    dpkgbuf_pos = dpkgbuf+dpkgbuf_pos-p;
 495 }
 496                                                                         /*}}}*/
 497
 498 bool pkgDPkgPM::OpenLog()
 499 {
 500    string logdir = _config->FindDir("Dir::Log");
 501    if(not FileExists(logdir))
 502       return _error->Error(_("Directory '%s' missing"), logdir.c_str());
 503    string logfile_name = flCombine(logdir,
 504                                    _config->Find("Dir::Log::Terminal"));
 505    if (!logfile_name.empty())
 506    {
 507       term_out = fopen(logfile_name.c_str(),"a");
 508       chmod(logfile_name.c_str(), 0600);
 509       // output current time
 510       char outstr[200];
 511       time_t t = time(NULL);
 512       struct tm *tmp = localtime(&t);
 513       strftime(outstr, sizeof(outstr), "%F  %T", tmp);
 514       fprintf(term_out, "\nLog started: ");
 515       fprintf(term_out, outstr);
 516       fprintf(term_out, "\n");
 517    }
 518    return true;
 519 }
 520
 521 bool pkgDPkgPM::CloseLog()
 522 {
 523    if(term_out)
 524    {
 525       char outstr[200];
 526       time_t t = time(NULL);
 527       struct tm *tmp = localtime(&t);
 528       strftime(outstr, sizeof(outstr), "%F  %T", tmp);
 529       fprintf(term_out, "Log ended: ");
 530       fprintf(term_out, outstr);
 531       fprintf(term_out, "\n");
 532       fclose(term_out);
 533    }
 534    term_out = NULL;
 535    return true;
 536 }
 537
 538
 539 // DPkgPM::Go - Run the sequence                                        /*{{{*/
 540 // ---------------------------------------------------------------------
 541 /* This globs the operations and calls dpkg
 542  *
 543  * If it is called with "OutStatusFd" set to a valid file descriptor
 544  * apt will report the install progress over this fd. It maps the
 545  * dpkg states a package goes through to human readable (and i10n-able)
 546  * names and calculates a percentage for each step.
 547 */
 548 bool pkgDPkgPM::Go(int OutStatusFd)
 549 {
 550    unsigned int MaxArgs = _config->FindI("Dpkg::MaxArgs",8*1024);
 551    unsigned int MaxArgBytes = _config->FindI("Dpkg::MaxArgBytes",32*1024);
 552
 553    if (RunScripts("DPkg::Pre-Invoke") == false)
 554       return false;
 555
 556    if (RunScriptsWithPkgs("DPkg::Pre-Install-Pkgs") == false)
 557       return false;
 558
 559    // map the dpkg states to the operations that are performed
 560    // (this is sorted in the same way as Item::Ops)
 561    static const struct DpkgState DpkgStatesOpMap[][7] = {
 562       // Install operation
 563       {
 564          {"half-installed", N_("Preparing %s")},
 565          {"unpacked", N_("Unpacking %s") },
 566          {NULL, NULL}
 567       },
 568       // Configure operation
 569       {
 570          {"unpacked",N_("Preparing to configure %s") },
 571          {"half-configured", N_("Configuring %s") },
 572 #if 0
 573          {"triggers-awaited", N_("Processing triggers for %s") },
 574          {"triggers-pending", N_("Processing triggers for %s") },
 575 #endif
 576          { "installed", N_("Installed %s")},
 577          {NULL, NULL}
 578       },
 579       // Remove operation
 580       {
 581          {"half-configured", N_("Preparing for removal of %s")},
 582 #if 0
 583          {"triggers-awaited", N_("Preparing for removal of %s")},
 584          {"triggers-pending", N_("Preparing for removal of %s")},
 585 #endif
 586          {"half-installed", N_("Removing %s")},
 587          {"config-files",  N_("Removed %s")},
 588          {NULL, NULL}
 589       },
 590       // Purge operation
 591       {
 592          {"config-files", N_("Preparing to completely remove %s")},
 593          {"not-installed", N_("Completely removed %s")},
 594          {NULL, NULL}
 595       },
 596    };
 597
 598    // init the PackageOps map, go over the list of packages that
 599    // that will be [installed|configured|removed|purged] and add
 600    // them to the PackageOps map (the dpkg states it goes through)
 601    // and the PackageOpsTranslations (human readable strings)
 602    for (vector<Item>::iterator I = List.begin(); I != List.end();I++)
 603    {
 604       string name = (*I).Pkg.Name();
 605       PackageOpsDone[name] = 0;
 606       for(int i=0; (DpkgStatesOpMap[(*I).Op][i]).state != NULL;  i++)
 607       {
 608          PackageOps[name].push_back(DpkgStatesOpMap[(*I).Op][i]);
 609          PackagesTotal++;
 610       }
 611    }
 612
 613    // create log
 614    OpenLog();
 615
 616    // this loop is runs once per operation
 617    for (vector<Item>::iterator I = List.begin(); I != List.end();)
 618    {
 619       vector<Item>::iterator J = I;
 620       for (; J != List.end() && J->Op == I->Op; J++);
 621
 622       // Generate the argument list
 623       const char *Args[MaxArgs + 50];
 624       if (J - I > (signed)MaxArgs)
 625          J = I + MaxArgs;
 626
 627       unsigned int n = 0;
 628       unsigned long Size = 0;
 629       string Tmp = _config->Find("Dir::Bin::dpkg","dpkg");
 630       Args[n++] = Tmp.c_str();
 631       Size += strlen(Args[n-1]);
 632
 633       // Stick in any custom dpkg options
 634       Configuration::Item const *Opts = _config->Tree("DPkg::Options");
 635       if (Opts != 0)
 636       {
 637          Opts = Opts->Child;
 638          for (; Opts != 0; Opts = Opts->Next)
 639          {
 640             if (Opts->Value.empty() == true)
 641                continue;
 642             Args[n++] = Opts->Value.c_str();
 643             Size += Opts->Value.length();
 644          }
 645       }
 646
 647       char status_fd_buf[20];
 648       int fd[2];
 649       pipe(fd);
 650
 651       Args[n++] = "--status-fd";
 652       Size += strlen(Args[n-1]);
 653       snprintf(status_fd_buf,sizeof(status_fd_buf),"%i", fd[1]);
 654       Args[n++] = status_fd_buf;
 655       Size += strlen(Args[n-1]);
 656
 657       switch (I->Op)
 658       {
 659          case Item::Remove:
 660          Args[n++] = "--force-depends";
 661          Size += strlen(Args[n-1]);
 662          Args[n++] = "--force-remove-essential";
 663          Size += strlen(Args[n-1]);
 664          Args[n++] = "--remove";
 665          Size += strlen(Args[n-1]);
 666          break;
 667
 668          case Item::Purge:
 669          Args[n++] = "--force-depends";
 670          Size += strlen(Args[n-1]);
 671          Args[n++] = "--force-remove-essential";
 672          Size += strlen(Args[n-1]);
 673          Args[n++] = "--purge";
 674          Size += strlen(Args[n-1]);
 675          break;
 676
 677          case Item::Configure:
 678          Args[n++] = "--configure";
 679          Size += strlen(Args[n-1]);
 680          break;
 681
 682          case Item::Install:
 683          Args[n++] = "--unpack";
 684          Size += strlen(Args[n-1]);
 685          Args[n++] = "--auto-deconfigure";
 686          Size += strlen(Args[n-1]);
 687          break;
 688       }
 689
 690       // Write in the file or package names
 691       if (I->Op == Item::Install)
 692       {
 693          for (;I != J && Size < MaxArgBytes; I++)
 694          {
 695             if (I->File[0] != '/')
 696                return _error->Error("Internal Error, Pathname to install is not absolute '%s'",I->File.c_str());
 697             Args[n++] = I->File.c_str();
 698             Size += strlen(Args[n-1]);
 699          }
 700       }
 701       else
 702       {
 703          for (;I != J && Size < MaxArgBytes; I++)
 704          {
 705             Args[n++] = I->Pkg.Name();
 706             Size += strlen(Args[n-1]);
 707          }
 708       }
 709       Args[n] = 0;
 710       J = I;
 711
 712       if (_config->FindB("Debug::pkgDPkgPM",false) == true)
 713       {
 714          for (unsigned int k = 0; k != n; k++)
 715             clog << Args[k] << ' ';
 716          clog << endl;
 717          continue;
 718       }
 719
 720       cout << flush;
 721       clog << flush;
 722       cerr << flush;
 723
 724       /* Mask off sig int/quit. We do this because dpkg also does when
 725          it forks scripts. What happens is that when you hit ctrl-c it sends
 726          it to all processes in the group. Since dpkg ignores the signal
 727          it doesn't die but we do! So we must also ignore it */
 728       sighandler_t old_SIGQUIT = signal(SIGQUIT,SIG_IGN);
 729       sighandler_t old_SIGINT = signal(SIGINT,SIG_IGN);
 730
 731       struct    termios tt;
 732       struct    winsize win;
 733       int       master;
 734       int       slave;
 735
 736       // FIXME: setup sensible signal handling (*ick*)
 737       tcgetattr(0, &tt);
 738       ioctl(0, TIOCGWINSZ, (char *)&win);
 739       if (openpty(&master, &slave, NULL, &tt, &win) < 0)
 740       {
 741          const char *s = _("Can not write log, openpty() "
 742                            "failed (/dev/pts not mounted?)\n");
 743          fprintf(stderr, "%s",s);
 744          fprintf(term_out, "%s",s);
 745          master = slave = -1;
 746       }  else {
 747          struct termios rtt;
 748          rtt = tt;
 749          cfmakeraw(&rtt);
 750          rtt.c_lflag &= ~ECHO;
 751          tcsetattr(0, TCSAFLUSH, &rtt);
 752       }
 753
 754        // Fork dpkg
 755       pid_t Child;
 756       _config->Set("APT::Keep-Fds::",fd[1]);
 757       Child = ExecFork();
 758
 759       // This is the child
 760       if (Child == 0)
 761       {
 762          if(slave >= 0 && master >= 0)
 763          {
 764             setsid();
 765             ioctl(slave, TIOCSCTTY, 0);
 766             close(master);
 767             dup2(slave, 0);
 768             dup2(slave, 1);
 769             dup2(slave, 2);
 770             close(slave);
 771          }
 772          close(fd[0]); // close the read end of the pipe
 773
 774          if (chdir(_config->FindDir("DPkg::Run-Directory","/").c_str()) != 0)
 775             _exit(100);
 776
 777          if (_config->FindB("DPkg::FlushSTDIN",true) == true && isatty(STDIN_FILENO))
 778          {
 779             int Flags,dummy;
 780             if ((Flags = fcntl(STDIN_FILENO,F_GETFL,dummy)) < 0)
 781                _exit(100);
 782
 783             // Discard everything in stdin before forking dpkg
 784             if (fcntl(STDIN_FILENO,F_SETFL,Flags | O_NONBLOCK) < 0)
 785                _exit(100);
 786
 787             while (read(STDIN_FILENO,&dummy,1) == 1);
 788
 789             if (fcntl(STDIN_FILENO,F_SETFL,Flags & (~(long)O_NONBLOCK)) < 0)
 790                _exit(100);
 791          }
 792
 793
 794          /* No Job Control Stop Env is a magic dpkg var that prevents it
 795             from using sigstop */
 796          putenv((char *)"DPKG_NO_TSTP=yes");
 797          execvp(Args[0],(char **)Args);
 798          cerr << "Could not exec dpkg!" << endl;
 799          _exit(100);
 800       }
 801
 802       // clear the Keep-Fd again
 803       _config->Clear("APT::Keep-Fds",fd[1]);
 804
 805       // Wait for dpkg
 806       int Status = 0;
 807
 808       // we read from dpkg here
 809       int _dpkgin = fd[0];
 810       close(fd[1]);                        // close the write end of the pipe
 811
 812       // the result of the waitpid call
 813       int res;
 814       if(slave > 0)
 815          close(slave);
 816
 817       // setups fds
 818       fd_set rfds;
 819       struct timeval tv;
 820       int select_ret;
 821       while ((res=waitpid(Child,&Status, WNOHANG)) != Child) {
 822          if(res < 0) {
 823             // FIXME: move this to a function or something, looks ugly here
 824             // error handling, waitpid returned -1
 825             if (errno == EINTR)
 826                continue;
 827             RunScripts("DPkg::Post-Invoke");
 828
 829             // Restore sig int/quit
 830             signal(SIGQUIT,old_SIGQUIT);
 831             signal(SIGINT,old_SIGINT);
 832             return _error->Errno("waitpid","Couldn't wait for subprocess");
 833          }
 834
 835          // wait for input or output here
 836          FD_ZERO(&rfds);
 837          FD_SET(0, &rfds);
 838          FD_SET(_dpkgin, &rfds);
 839          if(master >= 0)
 840             FD_SET(master, &rfds);
 841          tv.tv_sec = 1;
 842          tv.tv_usec = 0;
 843          select_ret = select(max(master, _dpkgin)+1, &rfds, NULL, NULL, &tv);
 844          if (select_ret == 0)
 845             continue;
 846          else if (select_ret < 0 && errno == EINTR)
 847             continue;
 848          else if (select_ret < 0)
 849          {
 850             perror("select() returned error");
 851             continue;
 852          }
 853
 854          if(master >= 0 && FD_ISSET(master, &rfds))
 855             DoTerminalPty(master);
 856          if(master >= 0 && FD_ISSET(0, &rfds))
 857             DoStdin(master);
 858          if(FD_ISSET(_dpkgin, &rfds))
 859             DoDpkgStatusFd(_dpkgin, OutStatusFd);
 860       }
 861       close(_dpkgin);
 862
 863       // Restore sig int/quit
 864       signal(SIGQUIT,old_SIGQUIT);
 865       signal(SIGINT,old_SIGINT);
 866
 867       if(master >= 0 && slave >= 0)
 868          tcsetattr(0, TCSAFLUSH, &tt);
 869
 870       // Check for an error code.
 871       if (WIFEXITED(Status) == 0 || WEXITSTATUS(Status) != 0)
 872       {
 873          // if it was set to "keep-dpkg-runing" then we won't return
 874          // here but keep the loop going and just report it as a error
 875          // for later
 876          bool stopOnError = _config->FindB("Dpkg::StopOnError",true);
 877
 878          if(stopOnError)
 879             RunScripts("DPkg::Post-Invoke");
 880
 881          if (WIFSIGNALED(Status) != 0 && WTERMSIG(Status) == SIGSEGV)
 882             _error->Error("Sub-process %s received a segmentation fault.",Args[0]);
 883          else if (WIFEXITED(Status) != 0)
 884             _error->Error("Sub-process %s returned an error code (%u)",Args[0],WEXITSTATUS(Status));
 885          else
 886             _error->Error("Sub-process %s exited unexpectedly",Args[0]);
 887
 888          if(stopOnError)
 889          {
 890             CloseLog();
 891             return false;
 892          }
 893       }
 894    }
 895    CloseLog();
 896
 897    if (RunScripts("DPkg::Post-Invoke") == false)
 898       return false;
 899    return true;
 900 }
 901                                                                         /*}}}*/
 902 // pkgDpkgPM::Reset - Dump the contents of the command list             /*{{{*/
 903 // ---------------------------------------------------------------------
 904 /* */
 905 void pkgDPkgPM::Reset()
 906 {
 907    List.erase(List.begin(),List.end());
 908 }
 909                                                                         /*}}}*/