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