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