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 <string.h>
  29 #include <algorithm>
  30 #include <sstream>
  31 #include <map>
  32
  33 #include <termios.h>
  34 #include <unistd.h>
  35 #include <sys/ioctl.h>
  36 #include <pty.h>
  37
  38 #include <config.h>
  39 #include <apti18n.h>
  40                                                                         /*}}}*/
  41
  42 using namespace std;
  43
  44 namespace
  45 {
  46   // Maps the dpkg "processing" info to human readable names.  Entry 0
  47   // of each array is the key, entry 1 is the value.
  48   const std::pair<const char *, const char *> PackageProcessingOps[] = {
  49     std::make_pair("install",   N_("Installing %s")),
  50     std::make_pair("configure", N_("Configuring %s")),
  51     std::make_pair("remove",    N_("Removing %s")),
  52     std::make_pair("trigproc",  N_("Running post-installation trigger %s"))
  53   };
  54
  55   const std::pair<const char *, const char *> * const PackageProcessingOpsBegin = PackageProcessingOps;
  56   const std::pair<const char *, const char *> * const PackageProcessingOpsEnd   = PackageProcessingOps + sizeof(PackageProcessingOps) / sizeof(PackageProcessingOps[0]);
  57
  58   // Predicate to test whether an entry in the PackageProcessingOps
  59   // array matches a string.
  60   class MatchProcessingOp
  61   {
  62     const char *target;
  63
  64   public:
  65     MatchProcessingOp(const char *the_target)
  66       : target(the_target)
  67     {
  68     }
  69
  70     bool operator()(const std::pair<const char *, const char *> &pair) const
  71     {
  72       return strcmp(pair.first, target) == 0;
  73     }
  74   };
  75 }
  76
  77 /* helper function to ionice the given PID
  78
  79  there is no C header for ionice yet - just the syscall interface
  80  so we use the binary from util-linux
  81 */
  82 static bool
  83 ionice(int PID)
  84 {
  85    if (!FileExists("/usr/bin/ionice"))
  86       return false;
  87    pid_t Process = ExecFork();
  88    if (Process == 0)
  89    {
  90       char buf[32];
  91       snprintf(buf, sizeof(buf), "-p%d", PID);
  92       const char *Args[4];
  93       Args[0] = "/usr/bin/ionice";
  94       Args[1] = "-c3";
  95       Args[2] = buf;
  96       Args[3] = 0;
  97       execv(Args[0], (char **)Args);
  98    }
  99    return ExecWait(Process, "ionice");
 100 }
 101
 102 // DPkgPM::pkgDPkgPM - Constructor                                      /*{{{*/
 103 // ---------------------------------------------------------------------
 104 /* */
 105 pkgDPkgPM::pkgDPkgPM(pkgDepCache *Cache)
 106    : pkgPackageManager(Cache), dpkgbuf_pos(0),
 107      term_out(NULL), PackagesDone(0), PackagesTotal(0)
 108 {
 109 }
 110                                                                         /*}}}*/
 111 // DPkgPM::pkgDPkgPM - Destructor                                       /*{{{*/
 112 // ---------------------------------------------------------------------
 113 /* */
 114 pkgDPkgPM::~pkgDPkgPM()
 115 {
 116 }
 117                                                                         /*}}}*/
 118 // DPkgPM::Install - Install a package                                  /*{{{*/
 119 // ---------------------------------------------------------------------
 120 /* Add an install operation to the sequence list */
 121 bool pkgDPkgPM::Install(PkgIterator Pkg,string File)
 122 {
 123    if (File.empty() == true || Pkg.end() == true)
 124       return _error->Error("Internal Error, No file name for %s",Pkg.Name());
 125
 126    List.push_back(Item(Item::Install,Pkg,File));
 127    return true;
 128 }
 129                                                                         /*}}}*/
 130 // DPkgPM::Configure - Configure a package                              /*{{{*/
 131 // ---------------------------------------------------------------------
 132 /* Add a configure operation to the sequence list */
 133 bool pkgDPkgPM::Configure(PkgIterator Pkg)
 134 {
 135    if (Pkg.end() == true)
 136       return false;
 137
 138    List.push_back(Item(Item::Configure, Pkg));
 139
 140    // Use triggers for config calls if we configure "smart"
 141    // as otherwise Pre-Depends will not be satisfied, see #526774
 142    if (_config->FindB("DPkg::TriggersPending", false) == true)
 143       List.push_back(Item(Item::TriggersPending, PkgIterator()));
 144
 145    return true;
 146 }
 147                                                                         /*}}}*/
 148 // DPkgPM::Remove - Remove a package                                    /*{{{*/
 149 // ---------------------------------------------------------------------
 150 /* Add a remove operation to the sequence list */
 151 bool pkgDPkgPM::Remove(PkgIterator Pkg,bool Purge)
 152 {
 153    if (Pkg.end() == true)
 154       return false;
 155
 156    if (Purge == true)
 157       List.push_back(Item(Item::Purge,Pkg));
 158    else
 159       List.push_back(Item(Item::Remove,Pkg));
 160    return true;
 161 }
 162                                                                         /*}}}*/
 163 // DPkgPM::SendV2Pkgs - Send version 2 package info                     /*{{{*/
 164 // ---------------------------------------------------------------------
 165 /* This is part of the helper script communication interface, it sends
 166    very complete information down to the other end of the pipe.*/
 167 bool pkgDPkgPM::SendV2Pkgs(FILE *F)
 168 {
 169    fprintf(F,"VERSION 2\n");
 170
 171    /* Write out all of the configuration directives by walking the
 172       configuration tree */
 173    const Configuration::Item *Top = _config->Tree(0);
 174    for (; Top != 0;)
 175    {
 176       if (Top->Value.empty() == false)
 177       {
 178          fprintf(F,"%s=%s\n",
 179                  QuoteString(Top->FullTag(),"=\"\n").c_str(),
 180                  QuoteString(Top->Value,"\n").c_str());
 181       }
 182
 183       if (Top->Child != 0)
 184       {
 185          Top = Top->Child;
 186          continue;
 187       }
 188
 189       while (Top != 0 && Top->Next == 0)
 190          Top = Top->Parent;
 191       if (Top != 0)
 192          Top = Top->Next;
 193    }
 194    fprintf(F,"\n");
 195
 196    // Write out the package actions in order.
 197    for (vector<Item>::iterator I = List.begin(); I != List.end(); I++)
 198    {
 199       if(I->Pkg.end() == true)
 200          continue;
 201
 202       pkgDepCache::StateCache &S = Cache[I->Pkg];
 203
 204       fprintf(F,"%s ",I->Pkg.Name());
 205       // Current version
 206       if (I->Pkg->CurrentVer == 0)
 207          fprintf(F,"- ");
 208       else
 209          fprintf(F,"%s ",I->Pkg.CurrentVer().VerStr());
 210
 211       // Show the compare operator
 212       // Target version
 213       if (S.InstallVer != 0)
 214       {
 215          int Comp = 2;
 216          if (I->Pkg->CurrentVer != 0)
 217             Comp = S.InstVerIter(Cache).CompareVer(I->Pkg.CurrentVer());
 218          if (Comp < 0)
 219             fprintf(F,"> ");
 220          if (Comp == 0)
 221             fprintf(F,"= ");
 222          if (Comp > 0)
 223             fprintf(F,"< ");
 224          fprintf(F,"%s ",S.InstVerIter(Cache).VerStr());
 225       }
 226       else
 227          fprintf(F,"> - ");
 228
 229       // Show the filename/operation
 230       if (I->Op == Item::Install)
 231       {
 232          // No errors here..
 233          if (I->File[0] != '/')
 234             fprintf(F,"**ERROR**\n");
 235          else
 236             fprintf(F,"%s\n",I->File.c_str());
 237       }
 238       if (I->Op == Item::Configure)
 239          fprintf(F,"**CONFIGURE**\n");
 240       if (I->Op == Item::Remove ||
 241           I->Op == Item::Purge)
 242          fprintf(F,"**REMOVE**\n");
 243
 244       if (ferror(F) != 0)
 245          return false;
 246    }
 247    return true;
 248 }
 249                                                                         /*}}}*/
 250 // DPkgPM::RunScriptsWithPkgs - Run scripts with package names on stdin /*{{{*/
 251 // ---------------------------------------------------------------------
 252 /* This looks for a list of scripts to run from the configuration file
 253    each one is run and is fed on standard input a list of all .deb files
 254    that are due to be installed. */
 255 bool pkgDPkgPM::RunScriptsWithPkgs(const char *Cnf)
 256 {
 257    Configuration::Item const *Opts = _config->Tree(Cnf);
 258    if (Opts == 0 || Opts->Child == 0)
 259       return true;
 260    Opts = Opts->Child;
 261
 262    unsigned int Count = 1;
 263    for (; Opts != 0; Opts = Opts->Next, Count++)
 264    {
 265       if (Opts->Value.empty() == true)
 266          continue;
 267
 268       // Determine the protocol version
 269       string OptSec = Opts->Value;
 270       string::size_type Pos;
 271       if ((Pos = OptSec.find(' ')) == string::npos || Pos == 0)
 272          Pos = OptSec.length();
 273       OptSec = "DPkg::Tools::Options::" + string(Opts->Value.c_str(),Pos);
 274
 275       unsigned int Version = _config->FindI(OptSec+"::Version",1);
 276
 277       // Create the pipes
 278       int Pipes[2];
 279       if (pipe(Pipes) != 0)
 280          return _error->Errno("pipe","Failed to create IPC pipe to subprocess");
 281       SetCloseExec(Pipes[0],true);
 282       SetCloseExec(Pipes[1],true);
 283
 284       // Purified Fork for running the script
 285       pid_t Process = ExecFork();
 286       if (Process == 0)
 287       {
 288          // Setup the FDs
 289          dup2(Pipes[0],STDIN_FILENO);
 290          SetCloseExec(STDOUT_FILENO,false);
 291          SetCloseExec(STDIN_FILENO,false);
 292          SetCloseExec(STDERR_FILENO,false);
 293
 294          const char *Args[4];
 295          Args[0] = "/bin/sh";
 296          Args[1] = "-c";
 297          Args[2] = Opts->Value.c_str();
 298          Args[3] = 0;
 299          execv(Args[0],(char **)Args);
 300          _exit(100);
 301       }
 302       close(Pipes[0]);
 303       FILE *F = fdopen(Pipes[1],"w");
 304       if (F == 0)
 305          return _error->Errno("fdopen","Faild to open new FD");
 306
 307       // Feed it the filenames.
 308       bool Die = false;
 309       if (Version <= 1)
 310       {
 311          for (vector<Item>::iterator I = List.begin(); I != List.end(); I++)
 312          {
 313             // Only deal with packages to be installed from .deb
 314             if (I->Op != Item::Install)
 315                continue;
 316
 317             // No errors here..
 318             if (I->File[0] != '/')
 319                continue;
 320
 321             /* Feed the filename of each package that is pending install
 322                into the pipe. */
 323             fprintf(F,"%s\n",I->File.c_str());
 324             if (ferror(F) != 0)
 325             {
 326                Die = true;
 327                break;
 328             }
 329          }
 330       }
 331       else
 332          Die = !SendV2Pkgs(F);
 333
 334       fclose(F);
 335
 336       // Clean up the sub process
 337       if (ExecWait(Process,Opts->Value.c_str()) == false)
 338          return _error->Error("Failure running script %s",Opts->Value.c_str());
 339    }
 340
 341    return true;
 342 }
 343
 344                                                                         /*}}}*/
 345 // DPkgPM::DoStdin - Read stdin and pass to slave pty                   /*{{{*/
 346 // ---------------------------------------------------------------------
 347 /*
 348 */
 349 void pkgDPkgPM::DoStdin(int master)
 350 {
 351    unsigned char input_buf[256] = {0,};
 352    ssize_t len = read(0, input_buf, sizeof(input_buf));
 353    if (len)
 354       write(master, input_buf, len);
 355    else
 356       stdin_is_dev_null = true;
 357 }
 358                                                                         /*}}}*/
 359 // DPkgPM::DoTerminalPty - Read the terminal pty and write log          /*{{{*/
 360 // ---------------------------------------------------------------------
 361 /*
 362  * read the terminal pty and write log
 363  */
 364 void pkgDPkgPM::DoTerminalPty(int master)
 365 {
 366    unsigned char term_buf[1024] = {0,0, };
 367
 368    ssize_t len=read(master, term_buf, sizeof(term_buf));
 369    if(len == -1 && errno == EIO)
 370    {
 371       // this happens when the child is about to exit, we
 372       // give it time to actually exit, otherwise we run
 373       // into a race
 374       usleep(500000);
 375       return;
 376    }
 377    if(len <= 0)
 378       return;
 379    write(1, term_buf, len);
 380    if(term_out)
 381       fwrite(term_buf, len, sizeof(char), term_out);
 382 }
 383                                                                         /*}}}*/
 384 // DPkgPM::ProcessDpkgStatusBuf                                         /*{{{*/
 385 // ---------------------------------------------------------------------
 386 /*
 387  */
 388 void pkgDPkgPM::ProcessDpkgStatusLine(int OutStatusFd, char *line)
 389 {
 390    bool const Debug = _config->FindB("Debug::pkgDPkgProgressReporting",false);
 391    // the status we output
 392    ostringstream status;
 393
 394    if (Debug == true)
 395       std::clog << "got from dpkg '" << line << "'" << std::endl;
 396
 397
 398    /* dpkg sends strings like this:
 399       'status:   <pkg>:  <pkg  qstate>'
 400       errors look like this:
 401       '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
 402       and conffile-prompt like this
 403       'status: conffile-prompt: conffile : 'current-conffile' 'new-conffile' useredited distedited
 404
 405       Newer versions of dpkg sent also:
 406       'processing: install: pkg'
 407       'processing: configure: pkg'
 408       'processing: remove: pkg'
 409       'processing: purge: pkg' - but for apt is it a ignored "unknown" action
 410       'processing: trigproc: trigger'
 411
 412    */
 413    char* list[5];
 414    //        dpkg sends multiline error messages sometimes (see
 415    //        #374195 for a example. we should support this by
 416    //        either patching dpkg to not send multiline over the
 417    //        statusfd or by rewriting the code here to deal with
 418    //        it. for now we just ignore it and not crash
 419    TokSplitString(':', line, list, sizeof(list)/sizeof(list[0]));
 420    if( list[0] == NULL || list[1] == NULL || list[2] == NULL)
 421    {
 422       if (Debug == true)
 423          std::clog << "ignoring line: not enough ':'" << std::endl;
 424       return;
 425    }
 426    const char* const pkg = list[1];
 427    const char* action = _strstrip(list[2]);
 428
 429    // 'processing' from dpkg looks like
 430    // 'processing: action: pkg'
 431    if(strncmp(list[0], "processing", strlen("processing")) == 0)
 432    {
 433       char s[200];
 434       const char* const pkg_or_trigger = _strstrip(list[2]);
 435       action = _strstrip( list[1]);
 436       const std::pair<const char *, const char *> * const iter =
 437         std::find_if(PackageProcessingOpsBegin,
 438                      PackageProcessingOpsEnd,
 439                      MatchProcessingOp(action));
 440       if(iter == PackageProcessingOpsEnd)
 441       {
 442          if (Debug == true)
 443             std::clog << "ignoring unknown action: " << action << std::endl;
 444          return;
 445       }
 446       snprintf(s, sizeof(s), _(iter->second), pkg_or_trigger);
 447
 448       status << "pmstatus:" << pkg_or_trigger
 449              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 450              << ":" << s
 451              << endl;
 452       if(OutStatusFd > 0)
 453          write(OutStatusFd, status.str().c_str(), status.str().size());
 454       if (Debug == true)
 455          std::clog << "send: '" << status.str() << "'" << endl;
 456       return;
 457    }
 458
 459    if(strncmp(action,"error",strlen("error")) == 0)
 460    {
 461       status << "pmerror:" << list[1]
 462              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 463              << ":" << list[3]
 464              << endl;
 465       if(OutStatusFd > 0)
 466          write(OutStatusFd, status.str().c_str(), status.str().size());
 467       if (Debug == true)
 468          std::clog << "send: '" << status.str() << "'" << endl;
 469       return;
 470    }
 471    else if(strncmp(action,"conffile",strlen("conffile")) == 0)
 472    {
 473       status << "pmconffile:" << list[1]
 474              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 475              << ":" << list[3]
 476              << endl;
 477       if(OutStatusFd > 0)
 478          write(OutStatusFd, status.str().c_str(), status.str().size());
 479       if (Debug == true)
 480          std::clog << "send: '" << status.str() << "'" << endl;
 481       return;
 482    }
 483
 484    vector<struct DpkgState> const &states = PackageOps[pkg];
 485    const char *next_action = NULL;
 486    if(PackageOpsDone[pkg] < states.size())
 487       next_action = states[PackageOpsDone[pkg]].state;
 488    // check if the package moved to the next dpkg state
 489    if(next_action && (strcmp(action, next_action) == 0))
 490    {
 491       // only read the translation if there is actually a next
 492       // action
 493       const char *translation = _(states[PackageOpsDone[pkg]].str);
 494       char s[200];
 495       snprintf(s, sizeof(s), translation, pkg);
 496
 497       // we moved from one dpkg state to a new one, report that
 498       PackageOpsDone[pkg]++;
 499       PackagesDone++;
 500       // build the status str
 501       status << "pmstatus:" << pkg
 502              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 503              << ":" << s
 504              << endl;
 505       if(OutStatusFd > 0)
 506          write(OutStatusFd, status.str().c_str(), status.str().size());
 507       if (Debug == true)
 508          std::clog << "send: '" << status.str() << "'" << endl;
 509    }
 510    if (Debug == true)
 511       std::clog << "(parsed from dpkg) pkg: " << pkg
 512                 << " action: " << action << endl;
 513 }
 514                                                                         /*}}}*/
 515 // DPkgPM::DoDpkgStatusFd                                               /*{{{*/
 516 // ---------------------------------------------------------------------
 517 /*
 518  */
 519 void pkgDPkgPM::DoDpkgStatusFd(int statusfd, int OutStatusFd)
 520 {
 521    char *p, *q;
 522    int len;
 523
 524    len=read(statusfd, &dpkgbuf[dpkgbuf_pos], sizeof(dpkgbuf)-dpkgbuf_pos);
 525    dpkgbuf_pos += len;
 526    if(len <= 0)
 527       return;
 528
 529    // process line by line if we have a buffer
 530    p = q = dpkgbuf;
 531    while((q=(char*)memchr(p, '\n', dpkgbuf+dpkgbuf_pos-p)) != NULL)
 532    {
 533       *q = 0;
 534       ProcessDpkgStatusLine(OutStatusFd, p);
 535       p=q+1; // continue with next line
 536    }
 537
 538    // now move the unprocessed bits (after the final \n that is now a 0x0)
 539    // to the start and update dpkgbuf_pos
 540    p = (char*)memrchr(dpkgbuf, 0, dpkgbuf_pos);
 541    if(p == NULL)
 542       return;
 543
 544    // we are interessted in the first char *after* 0x0
 545    p++;
 546
 547    // move the unprocessed tail to the start and update pos
 548    memmove(dpkgbuf, p, p-dpkgbuf);
 549    dpkgbuf_pos = dpkgbuf+dpkgbuf_pos-p;
 550 }
 551                                                                         /*}}}*/
 552 // DPkgPM::OpenLog                                                      /*{{{*/
 553 bool pkgDPkgPM::OpenLog()
 554 {
 555    string logdir = _config->FindDir("Dir::Log");
 556    if(not FileExists(logdir))
 557       return _error->Error(_("Directory '%s' missing"), logdir.c_str());
 558    string logfile_name = flCombine(logdir,
 559                                    _config->Find("Dir::Log::Terminal"));
 560    if (!logfile_name.empty())
 561    {
 562       term_out = fopen(logfile_name.c_str(),"a");
 563       chmod(logfile_name.c_str(), 0600);
 564       // output current time
 565       char outstr[200];
 566       time_t t = time(NULL);
 567       struct tm *tmp = localtime(&t);
 568       strftime(outstr, sizeof(outstr), "%F  %T", tmp);
 569       fprintf(term_out, "\nLog started: ");
 570       fprintf(term_out, "%s", outstr);
 571       fprintf(term_out, "\n");
 572    }
 573    return true;
 574 }
 575                                                                         /*}}}*/
 576 // DPkg::CloseLog                                                       /*{{{*/
 577 bool pkgDPkgPM::CloseLog()
 578 {
 579    if(term_out)
 580    {
 581       char outstr[200];
 582       time_t t = time(NULL);
 583       struct tm *tmp = localtime(&t);
 584       strftime(outstr, sizeof(outstr), "%F  %T", tmp);
 585       fprintf(term_out, "Log ended: ");
 586       fprintf(term_out, "%s", outstr);
 587       fprintf(term_out, "\n");
 588       fclose(term_out);
 589    }
 590    term_out = NULL;
 591    return true;
 592 }
 593                                                                         /*}}}*/
 594 /*{{{*/
 595 // This implements a racy version of pselect for those architectures
 596 // that don't have a working implementation.
 597 // FIXME: Probably can be removed on Lenny+1
 598 static int racy_pselect(int nfds, fd_set *readfds, fd_set *writefds,
 599    fd_set *exceptfds, const struct timespec *timeout,
 600    const sigset_t *sigmask)
 601 {
 602    sigset_t origmask;
 603    struct timeval tv;
 604    int retval;
 605
 606    tv.tv_sec = timeout->tv_sec;
 607    tv.tv_usec = timeout->tv_nsec/1000;
 608
 609    sigprocmask(SIG_SETMASK, sigmask, &origmask);
 610    retval = select(nfds, readfds, writefds, exceptfds, &tv);
 611    sigprocmask(SIG_SETMASK, &origmask, 0);
 612    return retval;
 613 }
 614 /*}}}*/
 615 // DPkgPM::Go - Run the sequence                                        /*{{{*/
 616 // ---------------------------------------------------------------------
 617 /* This globs the operations and calls dpkg
 618  *
 619  * If it is called with "OutStatusFd" set to a valid file descriptor
 620  * apt will report the install progress over this fd. It maps the
 621  * dpkg states a package goes through to human readable (and i10n-able)
 622  * names and calculates a percentage for each step.
 623 */
 624 bool pkgDPkgPM::Go(int OutStatusFd)
 625 {
 626    fd_set rfds;
 627    struct timespec tv;
 628    sigset_t sigmask;
 629    sigset_t original_sigmask;
 630
 631    unsigned int const MaxArgs = _config->FindI("Dpkg::MaxArgs",8*1024);
 632    unsigned int const MaxArgBytes = _config->FindI("Dpkg::MaxArgBytes",32*1024);
 633    bool const NoTriggers = _config->FindB("DPkg::NoTriggers", false);
 634
 635    if (RunScripts("DPkg::Pre-Invoke") == false)
 636       return false;
 637
 638    if (RunScriptsWithPkgs("DPkg::Pre-Install-Pkgs") == false)
 639       return false;
 640
 641    // support subpressing of triggers processing for special
 642    // cases like d-i that runs the triggers handling manually
 643    bool const SmartConf = (_config->Find("PackageManager::Configure", "all") != "all");
 644    bool const TriggersPending = _config->FindB("DPkg::TriggersPending", false);
 645    if (_config->FindB("DPkg::ConfigurePending", SmartConf) == true)
 646       List.push_back(Item(Item::ConfigurePending, PkgIterator()));
 647
 648    // map the dpkg states to the operations that are performed
 649    // (this is sorted in the same way as Item::Ops)
 650    static const struct DpkgState DpkgStatesOpMap[][7] = {
 651       // Install operation
 652       {
 653          {"half-installed", N_("Preparing %s")},
 654          {"unpacked", N_("Unpacking %s") },
 655          {NULL, NULL}
 656       },
 657       // Configure operation
 658       {
 659          {"unpacked",N_("Preparing to configure %s") },
 660          {"half-configured", N_("Configuring %s") },
 661          { "installed", N_("Installed %s")},
 662          {NULL, NULL}
 663       },
 664       // Remove operation
 665       {
 666          {"half-configured", N_("Preparing for removal of %s")},
 667          {"half-installed", N_("Removing %s")},
 668          {"config-files",  N_("Removed %s")},
 669          {NULL, NULL}
 670       },
 671       // Purge operation
 672       {
 673          {"config-files", N_("Preparing to completely remove %s")},
 674          {"not-installed", N_("Completely removed %s")},
 675          {NULL, NULL}
 676       },
 677    };
 678
 679    // init the PackageOps map, go over the list of packages that
 680    // that will be [installed|configured|removed|purged] and add
 681    // them to the PackageOps map (the dpkg states it goes through)
 682    // and the PackageOpsTranslations (human readable strings)
 683    for (vector<Item>::const_iterator I = List.begin(); I != List.end();I++)
 684    {
 685       if((*I).Pkg.end() == true)
 686          continue;
 687
 688       string const name = (*I).Pkg.Name();
 689       PackageOpsDone[name] = 0;
 690       for(int i=0; (DpkgStatesOpMap[(*I).Op][i]).state != NULL;  i++)
 691       {
 692          PackageOps[name].push_back(DpkgStatesOpMap[(*I).Op][i]);
 693          PackagesTotal++;
 694       }
 695    }
 696
 697    stdin_is_dev_null = false;
 698
 699    // create log
 700    OpenLog();
 701
 702    // this loop is runs once per operation
 703    for (vector<Item>::const_iterator I = List.begin(); I != List.end();)
 704    {
 705       // Do all actions with the same Op in one run
 706       vector<Item>::const_iterator J = I;
 707       if (TriggersPending == true)
 708          for (; J != List.end(); J++)
 709          {
 710             if (J->Op == I->Op)
 711                continue;
 712             if (J->Op != Item::TriggersPending)
 713                break;
 714             vector<Item>::const_iterator T = J + 1;
 715             if (T != List.end() && T->Op == I->Op)
 716                continue;
 717             break;
 718          }
 719       else
 720          for (; J != List.end() && J->Op == I->Op; J++)
 721             /* nothing */;
 722
 723       // Generate the argument list
 724       const char *Args[MaxArgs + 50];
 725
 726       // Now check if we are within the MaxArgs limit
 727       //
 728       // this code below is problematic, because it may happen that
 729       // the argument list is split in a way that A depends on B
 730       // and they are in the same "--configure A B" run
 731       // - with the split they may now be configured in different
 732       //   runs
 733       if (J - I > (signed)MaxArgs)
 734          J = I + MaxArgs;
 735
 736       unsigned int n = 0;
 737       unsigned long Size = 0;
 738       string const Tmp = _config->Find("Dir::Bin::dpkg","dpkg");
 739       Args[n++] = Tmp.c_str();
 740       Size += strlen(Args[n-1]);
 741
 742       // Stick in any custom dpkg options
 743       Configuration::Item const *Opts = _config->Tree("DPkg::Options");
 744       if (Opts != 0)
 745       {
 746          Opts = Opts->Child;
 747          for (; Opts != 0; Opts = Opts->Next)
 748          {
 749             if (Opts->Value.empty() == true)
 750                continue;
 751             Args[n++] = Opts->Value.c_str();
 752             Size += Opts->Value.length();
 753          }
 754       }
 755
 756       char status_fd_buf[20];
 757       int fd[2];
 758       pipe(fd);
 759
 760       Args[n++] = "--status-fd";
 761       Size += strlen(Args[n-1]);
 762       snprintf(status_fd_buf,sizeof(status_fd_buf),"%i", fd[1]);
 763       Args[n++] = status_fd_buf;
 764       Size += strlen(Args[n-1]);
 765
 766       switch (I->Op)
 767       {
 768          case Item::Remove:
 769          Args[n++] = "--force-depends";
 770          Size += strlen(Args[n-1]);
 771          Args[n++] = "--force-remove-essential";
 772          Size += strlen(Args[n-1]);
 773          Args[n++] = "--remove";
 774          Size += strlen(Args[n-1]);
 775          break;
 776
 777          case Item::Purge:
 778          Args[n++] = "--force-depends";
 779          Size += strlen(Args[n-1]);
 780          Args[n++] = "--force-remove-essential";
 781          Size += strlen(Args[n-1]);
 782          Args[n++] = "--purge";
 783          Size += strlen(Args[n-1]);
 784          break;
 785
 786          case Item::Configure:
 787          Args[n++] = "--configure";
 788          Size += strlen(Args[n-1]);
 789          break;
 790
 791          case Item::ConfigurePending:
 792          Args[n++] = "--configure";
 793          Size += strlen(Args[n-1]);
 794          Args[n++] = "--pending";
 795          Size += strlen(Args[n-1]);
 796          break;
 797
 798          case Item::TriggersPending:
 799          Args[n++] = "--triggers-only";
 800          Size += strlen(Args[n-1]);
 801          Args[n++] = "--pending";
 802          Size += strlen(Args[n-1]);
 803          break;
 804
 805          case Item::Install:
 806          Args[n++] = "--unpack";
 807          Size += strlen(Args[n-1]);
 808          Args[n++] = "--auto-deconfigure";
 809          Size += strlen(Args[n-1]);
 810          break;
 811       }
 812
 813       if (NoTriggers == true && I->Op != Item::TriggersPending &&
 814           I->Op != Item::ConfigurePending)
 815       {
 816          Args[n++] = "--no-triggers";
 817          Size += strlen(Args[n-1]);
 818       }
 819
 820       // Write in the file or package names
 821       if (I->Op == Item::Install)
 822       {
 823          for (;I != J && Size < MaxArgBytes; I++)
 824          {
 825             if (I->File[0] != '/')
 826                return _error->Error("Internal Error, Pathname to install is not absolute '%s'",I->File.c_str());
 827             Args[n++] = I->File.c_str();
 828             Size += strlen(Args[n-1]);
 829          }
 830       }
 831       else
 832       {
 833          for (;I != J && Size < MaxArgBytes; I++)
 834          {
 835             if((*I).Pkg.end() == true)
 836                continue;
 837             Args[n++] = I->Pkg.Name();
 838             Size += strlen(Args[n-1]);
 839          }
 840       }
 841       Args[n] = 0;
 842       J = I;
 843
 844       if (_config->FindB("Debug::pkgDPkgPM",false) == true)
 845       {
 846          for (unsigned int k = 0; k != n; k++)
 847             clog << Args[k] << ' ';
 848          clog << endl;
 849          continue;
 850       }
 851
 852       cout << flush;
 853       clog << flush;
 854       cerr << flush;
 855
 856       /* Mask off sig int/quit. We do this because dpkg also does when
 857          it forks scripts. What happens is that when you hit ctrl-c it sends
 858          it to all processes in the group. Since dpkg ignores the signal
 859          it doesn't die but we do! So we must also ignore it */
 860       sighandler_t old_SIGQUIT = signal(SIGQUIT,SIG_IGN);
 861       sighandler_t old_SIGINT = signal(SIGINT,SIG_IGN);
 862
 863       // ignore SIGHUP as well (debian #463030)
 864       sighandler_t old_SIGHUP = signal(SIGHUP,SIG_IGN);
 865
 866       struct    termios tt;
 867       struct    winsize win;
 868       int       master;
 869       int       slave;
 870
 871       // FIXME: setup sensible signal handling (*ick*)
 872       tcgetattr(0, &tt);
 873       ioctl(0, TIOCGWINSZ, (char *)&win);
 874       if (openpty(&master, &slave, NULL, &tt, &win) < 0)
 875       {
 876          const char *s = _("Can not write log, openpty() "
 877                            "failed (/dev/pts not mounted?)\n");
 878          fprintf(stderr, "%s",s);
 879          fprintf(term_out, "%s",s);
 880          master = slave = -1;
 881       }  else {
 882          struct termios rtt;
 883          rtt = tt;
 884          cfmakeraw(&rtt);
 885          rtt.c_lflag &= ~ECHO;
 886          // block SIGTTOU during tcsetattr to prevent a hang if
 887          // the process is a member of the background process group
 888          // http://www.opengroup.org/onlinepubs/000095399/functions/tcsetattr.html
 889          sigemptyset(&sigmask);
 890          sigaddset(&sigmask, SIGTTOU);
 891          sigprocmask(SIG_BLOCK,&sigmask, &original_sigmask);
 892          tcsetattr(0, TCSAFLUSH, &rtt);
 893          sigprocmask(SIG_SETMASK, &original_sigmask, 0);
 894       }
 895
 896        // Fork dpkg
 897       pid_t Child;
 898       _config->Set("APT::Keep-Fds::",fd[1]);
 899       // send status information that we are about to fork dpkg
 900       if(OutStatusFd > 0) {
 901          ostringstream status;
 902          status << "pmstatus:dpkg-exec:"
 903                 << (PackagesDone/float(PackagesTotal)*100.0)
 904                 << ":" << _("Running dpkg")
 905                 << endl;
 906          write(OutStatusFd, status.str().c_str(), status.str().size());
 907       }
 908       Child = ExecFork();
 909
 910       // This is the child
 911       if (Child == 0)
 912       {
 913          if(slave >= 0 && master >= 0)
 914          {
 915             setsid();
 916             ioctl(slave, TIOCSCTTY, 0);
 917             close(master);
 918             dup2(slave, 0);
 919             dup2(slave, 1);
 920             dup2(slave, 2);
 921             close(slave);
 922          }
 923          close(fd[0]); // close the read end of the pipe
 924
 925          if (_config->FindDir("DPkg::Chroot-Directory","/") != "/")
 926          {
 927             std::cerr << "Chrooting into "
 928                       << _config->FindDir("DPkg::Chroot-Directory")
 929                       << std::endl;
 930             if (chroot(_config->FindDir("DPkg::Chroot-Directory","/").c_str()) != 0)
 931                _exit(100);
 932          }
 933
 934          if (chdir(_config->FindDir("DPkg::Run-Directory","/").c_str()) != 0)
 935             _exit(100);
 936
 937          if (_config->FindB("DPkg::FlushSTDIN",true) == true && isatty(STDIN_FILENO))
 938          {
 939             int Flags,dummy;
 940             if ((Flags = fcntl(STDIN_FILENO,F_GETFL,dummy)) < 0)
 941                _exit(100);
 942
 943             // Discard everything in stdin before forking dpkg
 944             if (fcntl(STDIN_FILENO,F_SETFL,Flags | O_NONBLOCK) < 0)
 945                _exit(100);
 946
 947             while (read(STDIN_FILENO,&dummy,1) == 1);
 948
 949             if (fcntl(STDIN_FILENO,F_SETFL,Flags & (~(long)O_NONBLOCK)) < 0)
 950                _exit(100);
 951          }
 952
 953          /* No Job Control Stop Env is a magic dpkg var that prevents it
 954             from using sigstop */
 955          putenv((char *)"DPKG_NO_TSTP=yes");
 956          execvp(Args[0],(char **)Args);
 957          cerr << "Could not exec dpkg!" << endl;
 958          _exit(100);
 959       }
 960
 961       // apply ionice
 962       if (_config->FindB("DPkg::UseIoNice", false) == true)
 963          ionice(Child);
 964
 965       // clear the Keep-Fd again
 966       _config->Clear("APT::Keep-Fds",fd[1]);
 967
 968       // Wait for dpkg
 969       int Status = 0;
 970
 971       // we read from dpkg here
 972       int const _dpkgin = fd[0];
 973       close(fd[1]);                        // close the write end of the pipe
 974
 975       if(slave > 0)
 976          close(slave);
 977
 978       // setups fds
 979       sigemptyset(&sigmask);
 980       sigprocmask(SIG_BLOCK,&sigmask,&original_sigmask);
 981
 982       // the result of the waitpid call
 983       int res;
 984       int select_ret;
 985       while ((res=waitpid(Child,&Status, WNOHANG)) != Child) {
 986          if(res < 0) {
 987             // FIXME: move this to a function or something, looks ugly here
 988             // error handling, waitpid returned -1
 989             if (errno == EINTR)
 990                continue;
 991             RunScripts("DPkg::Post-Invoke");
 992
 993             // Restore sig int/quit
 994             signal(SIGQUIT,old_SIGQUIT);
 995             signal(SIGINT,old_SIGINT);
 996             signal(SIGHUP,old_SIGHUP);
 997             return _error->Errno("waitpid","Couldn't wait for subprocess");
 998          }
 999
1000          // wait for input or output here
1001          FD_ZERO(&rfds);
1002          if (!stdin_is_dev_null)
1003             FD_SET(0, &rfds);
1004          FD_SET(_dpkgin, &rfds);
1005          if(master >= 0)
1006             FD_SET(master, &rfds);
1007          tv.tv_sec = 1;
1008          tv.tv_nsec = 0;
1009          select_ret = pselect(max(master, _dpkgin)+1, &rfds, NULL, NULL,
1010                               &tv, &original_sigmask);
1011          if (select_ret < 0 && (errno == EINVAL || errno == ENOSYS))
1012             select_ret = racy_pselect(max(master, _dpkgin)+1, &rfds, NULL,
1013                                       NULL, &tv, &original_sigmask);
1014          if (select_ret == 0)
1015             continue;
1016          else if (select_ret < 0 && errno == EINTR)
1017             continue;
1018          else if (select_ret < 0)
1019          {
1020             perror("select() returned error");
1021             continue;
1022          }
1023
1024          if(master >= 0 && FD_ISSET(master, &rfds))
1025             DoTerminalPty(master);
1026          if(master >= 0 && FD_ISSET(0, &rfds))
1027             DoStdin(master);
1028          if(FD_ISSET(_dpkgin, &rfds))
1029             DoDpkgStatusFd(_dpkgin, OutStatusFd);
1030       }
1031       close(_dpkgin);
1032
1033       // Restore sig int/quit
1034       signal(SIGQUIT,old_SIGQUIT);
1035       signal(SIGINT,old_SIGINT);
1036       signal(SIGHUP,old_SIGHUP);
1037
1038       if(master >= 0)
1039       {
1040          tcsetattr(0, TCSAFLUSH, &tt);
1041          close(master);
1042       }
1043
1044       // Check for an error code.
1045       if (WIFEXITED(Status) == 0 || WEXITSTATUS(Status) != 0)
1046       {
1047          // if it was set to "keep-dpkg-runing" then we won't return
1048          // here but keep the loop going and just report it as a error
1049          // for later
1050          bool const stopOnError = _config->FindB("Dpkg::StopOnError",true);
1051
1052          if(stopOnError)
1053             RunScripts("DPkg::Post-Invoke");
1054
1055          if (WIFSIGNALED(Status) != 0 && WTERMSIG(Status) == SIGSEGV)
1056             _error->Error("Sub-process %s received a segmentation fault.",Args[0]);
1057          else if (WIFEXITED(Status) != 0)
1058             _error->Error("Sub-process %s returned an error code (%u)",Args[0],WEXITSTATUS(Status));
1059          else
1060             _error->Error("Sub-process %s exited unexpectedly",Args[0]);
1061
1062          if(stopOnError)
1063          {
1064             CloseLog();
1065             return false;
1066          }
1067       }
1068    }
1069    CloseLog();
1070
1071    if (RunScripts("DPkg::Post-Invoke") == false)
1072       return false;
1073
1074    Cache.writeStateFile(NULL);
1075    return true;
1076 }
1077                                                                         /*}}}*/
1078 // pkgDpkgPM::Reset - Dump the contents of the command list             /*{{{*/
1079 // ---------------------------------------------------------------------
1080 /* */
1081 void pkgDPkgPM::Reset()
1082 {
1083    List.erase(List.begin(),List.end());
1084 }
1085                                                                         /*}}}*/