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