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    */
 338    char* list[5];
 339    //        dpkg sends multiline error messages sometimes (see
 340    //        #374195 for a example. we should support this by
 341    //        either patching dpkg to not send multiline over the
 342    //        statusfd or by rewriting the code here to deal with
 343    //        it. for now we just ignore it and not crash
 344    TokSplitString(':', line, list, sizeof(list)/sizeof(list[0]));
 345    if( list[0] == NULL || list[1] == NULL || list[2] == NULL)
 346    {
 347       if (_config->FindB("Debug::pkgDPkgProgressReporting",false) == true)
 348          std::clog << "ignoring line: not enough ':'" << std::endl;
 349       return;
 350    }
 351    char *pkg = list[1];
 352    char *action = _strstrip(list[2]);
 353
 354    if(strncmp(action,"error",strlen("error")) == 0)
 355    {
 356       status << "pmerror:" << list[1]
 357              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 358              << ":" << list[3]
 359              << endl;
 360       if(OutStatusFd > 0)
 361          write(OutStatusFd, status.str().c_str(), status.str().size());
 362       if (_config->FindB("Debug::pkgDPkgProgressReporting",false) == true)
 363          std::clog << "send: '" << status.str() << "'" << endl;
 364       return;
 365    }
 366    if(strncmp(action,"conffile",strlen("conffile")) == 0)
 367    {
 368       status << "pmconffile:" << list[1]
 369              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 370              << ":" << list[3]
 371              << endl;
 372       if(OutStatusFd > 0)
 373          write(OutStatusFd, status.str().c_str(), status.str().size());
 374       if (_config->FindB("Debug::pkgDPkgProgressReporting",false) == true)
 375          std::clog << "send: '" << status.str() << "'" << endl;
 376       return;
 377    }
 378
 379    vector<struct DpkgState> &states = PackageOps[pkg];
 380    const char *next_action = NULL;
 381    if(PackageOpsDone[pkg] < states.size())
 382       next_action = states[PackageOpsDone[pkg]].state;
 383    // check if the package moved to the next dpkg state
 384    if(next_action && (strcmp(action, next_action) == 0))
 385    {
 386       // only read the translation if there is actually a next
 387       // action
 388       const char *translation = _(states[PackageOpsDone[pkg]].str);
 389       char s[200];
 390       snprintf(s, sizeof(s), translation, pkg);
 391
 392       // we moved from one dpkg state to a new one, report that
 393       PackageOpsDone[pkg]++;
 394       PackagesDone++;
 395       // build the status str
 396       status << "pmstatus:" << pkg
 397              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 398              << ":" << s
 399              << endl;
 400       if(OutStatusFd > 0)
 401          write(OutStatusFd, status.str().c_str(), status.str().size());
 402       if (_config->FindB("Debug::pkgDPkgProgressReporting",false) == true)
 403          std::clog << "send: '" << status.str() << "'" << endl;
 404    }
 405    if (_config->FindB("Debug::pkgDPkgProgressReporting",false) == true)
 406       std::clog << "(parsed from dpkg) pkg: " << pkg
 407                 << " action: " << action << endl;
 408 }
 409
 410 // DPkgPM::DoDpkgStatusFd                                               /*{{{*/
 411 // ---------------------------------------------------------------------
 412 /*
 413  */
 414 void pkgDPkgPM::DoDpkgStatusFd(int statusfd, int OutStatusFd)
 415 {
 416    char *p, *q;
 417    int len;
 418
 419    len=read(statusfd, &dpkgbuf[dpkgbuf_pos], sizeof(dpkgbuf)-dpkgbuf_pos);
 420    dpkgbuf_pos += len;
 421    if(len <= 0)
 422       return;
 423
 424    // process line by line if we have a buffer
 425    p = q = dpkgbuf;
 426    while((q=(char*)memchr(p, '\n', dpkgbuf+dpkgbuf_pos-p)) != NULL)
 427    {
 428       *q = 0;
 429       ProcessDpkgStatusLine(OutStatusFd, p);
 430       p=q+1; // continue with next line
 431    }
 432
 433    // now move the unprocessed bits (after the final \n that is now a 0x0)
 434    // to the start and update dpkgbuf_pos
 435    p = (char*)memrchr(dpkgbuf, 0, dpkgbuf_pos);
 436    if(p == NULL)
 437       return;
 438
 439    // we are interessted in the first char *after* 0x0
 440    p++;
 441
 442    // move the unprocessed tail to the start and update pos
 443    memmove(dpkgbuf, p, p-dpkgbuf);
 444    dpkgbuf_pos = dpkgbuf+dpkgbuf_pos-p;
 445 }
 446                                                                         /*}}}*/
 447
 448 bool pkgDPkgPM::OpenLog()
 449 {
 450    string logdir = _config->FindDir("Dir::Log");
 451    if(not FileExists(logdir))
 452       return _error->Error(_("Directory '%s' missing"), logdir.c_str());
 453    string logfile_name = flCombine(logdir,
 454                                    _config->Find("Dir::Log::Terminal"));
 455    if (!logfile_name.empty())
 456    {
 457       term_out = fopen(logfile_name.c_str(),"a");
 458       chmod(logfile_name.c_str(), 0600);
 459       // output current time
 460       char outstr[200];
 461       time_t t = time(NULL);
 462       struct tm *tmp = localtime(&t);
 463       strftime(outstr, sizeof(outstr), "%F  %T", tmp);
 464       fprintf(term_out, "\nLog started: ");
 465       fprintf(term_out, outstr);
 466       fprintf(term_out, "\n");
 467    }
 468    return true;
 469 }
 470
 471 bool pkgDPkgPM::CloseLog()
 472 {
 473    if(term_out)
 474    {
 475       char outstr[200];
 476       time_t t = time(NULL);
 477       struct tm *tmp = localtime(&t);
 478       strftime(outstr, sizeof(outstr), "%F  %T", tmp);
 479       fprintf(term_out, "Log ended: ");
 480       fprintf(term_out, outstr);
 481       fprintf(term_out, "\n");
 482       fclose(term_out);
 483    }
 484    term_out = NULL;
 485    return true;
 486 }
 487
 488 /*{{{*/
 489 // This implements a racy version of pselect for those architectures
 490 // that don't have a working implementation.
 491 // FIXME: Probably can be removed on Lenny+1
 492 static int racy_pselect(int nfds, fd_set *readfds, fd_set *writefds,
 493    fd_set *exceptfds, const struct timespec *timeout,
 494    const sigset_t *sigmask)
 495 {
 496    sigset_t origmask;
 497    struct timeval tv;
 498    int retval;
 499
 500    tv.tv_sec = timeout->tv_sec;
 501    tv.tv_usec = timeout->tv_nsec/1000;
 502
 503    sigprocmask(SIG_SETMASK, sigmask, &origmask);
 504    retval = select(nfds, readfds, writefds, exceptfds, &tv);
 505    sigprocmask(SIG_SETMASK, &origmask, 0);
 506    return retval;
 507 }
 508 /*}}}*/
 509
 510 // DPkgPM::Go - Run the sequence                                        /*{{{*/
 511 // ---------------------------------------------------------------------
 512 /* This globs the operations and calls dpkg
 513  *
 514  * If it is called with "OutStatusFd" set to a valid file descriptor
 515  * apt will report the install progress over this fd. It maps the
 516  * dpkg states a package goes through to human readable (and i10n-able)
 517  * names and calculates a percentage for each step.
 518 */
 519 bool pkgDPkgPM::Go(int OutStatusFd)
 520 {
 521    unsigned int MaxArgs = _config->FindI("Dpkg::MaxArgs",8*1024);
 522    unsigned int MaxArgBytes = _config->FindI("Dpkg::MaxArgBytes",32*1024);
 523
 524    if (RunScripts("DPkg::Pre-Invoke") == false)
 525       return false;
 526
 527    if (RunScriptsWithPkgs("DPkg::Pre-Install-Pkgs") == false)
 528       return false;
 529
 530    // map the dpkg states to the operations that are performed
 531    // (this is sorted in the same way as Item::Ops)
 532    static const struct DpkgState DpkgStatesOpMap[][7] = {
 533       // Install operation
 534       {
 535          {"half-installed", N_("Preparing %s")},
 536          {"unpacked", N_("Unpacking %s") },
 537          {NULL, NULL}
 538       },
 539       // Configure operation
 540       {
 541          {"unpacked",N_("Preparing to configure %s") },
 542          {"half-configured", N_("Configuring %s") },
 543 #if 0
 544          {"triggers-awaited", N_("Processing triggers for %s") },
 545          {"triggers-pending", N_("Processing triggers for %s") },
 546 #endif
 547          { "installed", N_("Installed %s")},
 548          {NULL, NULL}
 549       },
 550       // Remove operation
 551       {
 552          {"half-configured", N_("Preparing for removal of %s")},
 553 #if 0
 554          {"triggers-awaited", N_("Preparing for removal of %s")},
 555          {"triggers-pending", N_("Preparing for removal of %s")},
 556 #endif
 557          {"half-installed", N_("Removing %s")},
 558          {"config-files",  N_("Removed %s")},
 559          {NULL, NULL}
 560       },
 561       // Purge operation
 562       {
 563          {"config-files", N_("Preparing to completely remove %s")},
 564          {"not-installed", N_("Completely removed %s")},
 565          {NULL, NULL}
 566       },
 567    };
 568
 569    // init the PackageOps map, go over the list of packages that
 570    // that will be [installed|configured|removed|purged] and add
 571    // them to the PackageOps map (the dpkg states it goes through)
 572    // and the PackageOpsTranslations (human readable strings)
 573    for (vector<Item>::iterator I = List.begin(); I != List.end();I++)
 574    {
 575       string name = (*I).Pkg.Name();
 576       PackageOpsDone[name] = 0;
 577       for(int i=0; (DpkgStatesOpMap[(*I).Op][i]).state != NULL;  i++)
 578       {
 579          PackageOps[name].push_back(DpkgStatesOpMap[(*I).Op][i]);
 580          PackagesTotal++;
 581       }
 582    }
 583
 584    stdin_is_dev_null = false;
 585
 586    // create log
 587    OpenLog();
 588
 589    // this loop is runs once per operation
 590    for (vector<Item>::iterator I = List.begin(); I != List.end();)
 591    {
 592       vector<Item>::iterator J = I;
 593       for (; J != List.end() && J->Op == I->Op; J++);
 594
 595       // Generate the argument list
 596       const char *Args[MaxArgs + 50];
 597       if (J - I > (signed)MaxArgs)
 598          J = I + MaxArgs;
 599
 600       unsigned int n = 0;
 601       unsigned long Size = 0;
 602       string Tmp = _config->Find("Dir::Bin::dpkg","dpkg");
 603       Args[n++] = Tmp.c_str();
 604       Size += strlen(Args[n-1]);
 605
 606       // Stick in any custom dpkg options
 607       Configuration::Item const *Opts = _config->Tree("DPkg::Options");
 608       if (Opts != 0)
 609       {
 610          Opts = Opts->Child;
 611          for (; Opts != 0; Opts = Opts->Next)
 612          {
 613             if (Opts->Value.empty() == true)
 614                continue;
 615             Args[n++] = Opts->Value.c_str();
 616             Size += Opts->Value.length();
 617          }
 618       }
 619
 620       char status_fd_buf[20];
 621       int fd[2];
 622       pipe(fd);
 623
 624       Args[n++] = "--status-fd";
 625       Size += strlen(Args[n-1]);
 626       snprintf(status_fd_buf,sizeof(status_fd_buf),"%i", fd[1]);
 627       Args[n++] = status_fd_buf;
 628       Size += strlen(Args[n-1]);
 629
 630       switch (I->Op)
 631       {
 632          case Item::Remove:
 633          Args[n++] = "--force-depends";
 634          Size += strlen(Args[n-1]);
 635          Args[n++] = "--force-remove-essential";
 636          Size += strlen(Args[n-1]);
 637          Args[n++] = "--remove";
 638          Size += strlen(Args[n-1]);
 639          break;
 640
 641          case Item::Purge:
 642          Args[n++] = "--force-depends";
 643          Size += strlen(Args[n-1]);
 644          Args[n++] = "--force-remove-essential";
 645          Size += strlen(Args[n-1]);
 646          Args[n++] = "--purge";
 647          Size += strlen(Args[n-1]);
 648          break;
 649
 650          case Item::Configure:
 651          Args[n++] = "--configure";
 652          Size += strlen(Args[n-1]);
 653          break;
 654
 655          case Item::Install:
 656          Args[n++] = "--unpack";
 657          Size += strlen(Args[n-1]);
 658          Args[n++] = "--auto-deconfigure";
 659          Size += strlen(Args[n-1]);
 660          break;
 661       }
 662
 663       // Write in the file or package names
 664       if (I->Op == Item::Install)
 665       {
 666          for (;I != J && Size < MaxArgBytes; I++)
 667          {
 668             if (I->File[0] != '/')
 669                return _error->Error("Internal Error, Pathname to install is not absolute '%s'",I->File.c_str());
 670             Args[n++] = I->File.c_str();
 671             Size += strlen(Args[n-1]);
 672          }
 673       }
 674       else
 675       {
 676          for (;I != J && Size < MaxArgBytes; I++)
 677          {
 678             Args[n++] = I->Pkg.Name();
 679             Size += strlen(Args[n-1]);
 680          }
 681       }
 682       Args[n] = 0;
 683       J = I;
 684
 685       if (_config->FindB("Debug::pkgDPkgPM",false) == true)
 686       {
 687          for (unsigned int k = 0; k != n; k++)
 688             clog << Args[k] << ' ';
 689          clog << endl;
 690          continue;
 691       }
 692
 693       cout << flush;
 694       clog << flush;
 695       cerr << flush;
 696
 697       /* Mask off sig int/quit. We do this because dpkg also does when
 698          it forks scripts. What happens is that when you hit ctrl-c it sends
 699          it to all processes in the group. Since dpkg ignores the signal
 700          it doesn't die but we do! So we must also ignore it */
 701       sighandler_t old_SIGQUIT = signal(SIGQUIT,SIG_IGN);
 702       sighandler_t old_SIGINT = signal(SIGINT,SIG_IGN);
 703
 704       struct    termios tt;
 705       struct    winsize win;
 706       int       master;
 707       int       slave;
 708
 709       // FIXME: setup sensible signal handling (*ick*)
 710       tcgetattr(0, &tt);
 711       ioctl(0, TIOCGWINSZ, (char *)&win);
 712       if (openpty(&master, &slave, NULL, &tt, &win) < 0)
 713       {
 714          const char *s = _("Can not write log, openpty() "
 715                            "failed (/dev/pts not mounted?)\n");
 716          fprintf(stderr, "%s",s);
 717          fprintf(term_out, "%s",s);
 718          master = slave = -1;
 719       }  else {
 720          struct termios rtt;
 721          rtt = tt;
 722          cfmakeraw(&rtt);
 723          rtt.c_lflag &= ~ECHO;
 724          tcsetattr(0, TCSAFLUSH, &rtt);
 725       }
 726
 727        // Fork dpkg
 728       pid_t Child;
 729       _config->Set("APT::Keep-Fds::",fd[1]);
 730       Child = ExecFork();
 731
 732       // This is the child
 733       if (Child == 0)
 734       {
 735          if(slave >= 0 && master >= 0)
 736          {
 737             setsid();
 738             ioctl(slave, TIOCSCTTY, 0);
 739             close(master);
 740             dup2(slave, 0);
 741             dup2(slave, 1);
 742             dup2(slave, 2);
 743             close(slave);
 744          }
 745          close(fd[0]); // close the read end of the pipe
 746
 747          if (chdir(_config->FindDir("DPkg::Run-Directory","/").c_str()) != 0)
 748             _exit(100);
 749
 750          if (_config->FindB("DPkg::FlushSTDIN",true) == true && isatty(STDIN_FILENO))
 751          {
 752             int Flags,dummy;
 753             if ((Flags = fcntl(STDIN_FILENO,F_GETFL,dummy)) < 0)
 754                _exit(100);
 755
 756             // Discard everything in stdin before forking dpkg
 757             if (fcntl(STDIN_FILENO,F_SETFL,Flags | O_NONBLOCK) < 0)
 758                _exit(100);
 759
 760             while (read(STDIN_FILENO,&dummy,1) == 1);
 761
 762             if (fcntl(STDIN_FILENO,F_SETFL,Flags & (~(long)O_NONBLOCK)) < 0)
 763                _exit(100);
 764          }
 765
 766
 767          /* No Job Control Stop Env is a magic dpkg var that prevents it
 768             from using sigstop */
 769          putenv((char *)"DPKG_NO_TSTP=yes");
 770          execvp(Args[0],(char **)Args);
 771          cerr << "Could not exec dpkg!" << endl;
 772          _exit(100);
 773       }
 774
 775       // clear the Keep-Fd again
 776       _config->Clear("APT::Keep-Fds",fd[1]);
 777
 778       // Wait for dpkg
 779       int Status = 0;
 780
 781       // we read from dpkg here
 782       int _dpkgin = fd[0];
 783       close(fd[1]);                        // close the write end of the pipe
 784
 785       // the result of the waitpid call
 786       int res;
 787       if(slave > 0)
 788          close(slave);
 789
 790       // setups fds
 791       fd_set rfds;
 792       struct timespec tv;
 793       sigset_t sigmask;
 794       sigset_t original_sigmask;
 795       sigemptyset(&sigmask);
 796       sigprocmask(SIG_BLOCK,&sigmask,&original_sigmask);
 797
 798       int select_ret;
 799       while ((res=waitpid(Child,&Status, WNOHANG)) != Child) {
 800          if(res < 0) {
 801             // FIXME: move this to a function or something, looks ugly here
 802             // error handling, waitpid returned -1
 803             if (errno == EINTR)
 804                continue;
 805             RunScripts("DPkg::Post-Invoke");
 806
 807             // Restore sig int/quit
 808             signal(SIGQUIT,old_SIGQUIT);
 809             signal(SIGINT,old_SIGINT);
 810             return _error->Errno("waitpid","Couldn't wait for subprocess");
 811          }
 812
 813          // wait for input or output here
 814          FD_ZERO(&rfds);
 815          if (!stdin_is_dev_null)
 816             FD_SET(0, &rfds);
 817          FD_SET(_dpkgin, &rfds);
 818          if(master >= 0)
 819             FD_SET(master, &rfds);
 820          tv.tv_sec = 1;
 821          tv.tv_nsec = 0;
 822          select_ret = pselect(max(master, _dpkgin)+1, &rfds, NULL, NULL,
 823                               &tv, &original_sigmask);
 824          if (select_ret < 0 && (errno == EINVAL || errno == ENOSYS))
 825             select_ret = racy_pselect(max(master, _dpkgin)+1, &rfds, NULL,
 826                                       NULL, &tv, &original_sigmask);
 827          if (select_ret == 0)
 828             continue;
 829          else if (select_ret < 0 && errno == EINTR)
 830             continue;
 831          else if (select_ret < 0)
 832          {
 833             perror("select() returned error");
 834             continue;
 835          }
 836
 837          if(master >= 0 && FD_ISSET(master, &rfds))
 838             DoTerminalPty(master);
 839          if(master >= 0 && FD_ISSET(0, &rfds))
 840             DoStdin(master);
 841          if(FD_ISSET(_dpkgin, &rfds))
 842             DoDpkgStatusFd(_dpkgin, OutStatusFd);
 843       }
 844       close(_dpkgin);
 845
 846       // Restore sig int/quit
 847       signal(SIGQUIT,old_SIGQUIT);
 848       signal(SIGINT,old_SIGINT);
 849
 850       if(master >= 0)
 851       {
 852          tcsetattr(0, TCSAFLUSH, &tt);
 853          close(master);
 854       }
 855
 856       // Check for an error code.
 857       if (WIFEXITED(Status) == 0 || WEXITSTATUS(Status) != 0)
 858       {
 859          // if it was set to "keep-dpkg-runing" then we won't return
 860          // here but keep the loop going and just report it as a error
 861          // for later
 862          bool stopOnError = _config->FindB("Dpkg::StopOnError",true);
 863
 864          if(stopOnError)
 865             RunScripts("DPkg::Post-Invoke");
 866
 867          if (WIFSIGNALED(Status) != 0 && WTERMSIG(Status) == SIGSEGV)
 868             _error->Error("Sub-process %s received a segmentation fault.",Args[0]);
 869          else if (WIFEXITED(Status) != 0)
 870             _error->Error("Sub-process %s returned an error code (%u)",Args[0],WEXITSTATUS(Status));
 871          else
 872             _error->Error("Sub-process %s exited unexpectedly",Args[0]);
 873
 874          if(stopOnError)
 875          {
 876             CloseLog();
 877             return false;
 878          }
 879       }
 880    }
 881    CloseLog();
 882
 883    if (RunScripts("DPkg::Post-Invoke") == false)
 884       return false;
 885    return true;
 886 }
 887                                                                         /*}}}*/
 888 // pkgDpkgPM::Reset - Dump the contents of the command list             /*{{{*/
 889 // ---------------------------------------------------------------------
 890 /* */
 891 void pkgDPkgPM::Reset()
 892 {
 893    List.erase(List.begin(),List.end());
 894 }
 895                                                                         /*}}}*/