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 #include <apt-pkg/fileutl.h>
  19
  20 #include <unistd.h>
  21 #include <stdlib.h>
  22 #include <fcntl.h>
  23 #include <sys/select.h>
  24 #include <sys/types.h>
  25 #include <sys/wait.h>
  26 #include <signal.h>
  27 #include <errno.h>
  28 #include <string.h>
  29 #include <stdio.h>
  30 #include <string.h>
  31 #include <algorithm>
  32 #include <sstream>
  33 #include <map>
  34
  35 #include <termios.h>
  36 #include <unistd.h>
  37 #include <sys/ioctl.h>
  38 #include <pty.h>
  39
  40 #include <config.h>
  41 #include <apti18n.h>
  42                                                                         /*}}}*/
  43
  44 using namespace std;
  45
  46 namespace
  47 {
  48   // Maps the dpkg "processing" info to human readable names.  Entry 0
  49   // of each array is the key, entry 1 is the value.
  50   const std::pair<const char *, const char *> PackageProcessingOps[] = {
  51     std::make_pair("install",   N_("Installing %s")),
  52     std::make_pair("configure", N_("Configuring %s")),
  53     std::make_pair("remove",    N_("Removing %s")),
  54     std::make_pair("trigproc",  N_("Running post-installation trigger %s"))
  55   };
  56
  57   const std::pair<const char *, const char *> * const PackageProcessingOpsBegin = PackageProcessingOps;
  58   const std::pair<const char *, const char *> * const PackageProcessingOpsEnd   = PackageProcessingOps + sizeof(PackageProcessingOps) / sizeof(PackageProcessingOps[0]);
  59
  60   // Predicate to test whether an entry in the PackageProcessingOps
  61   // array matches a string.
  62   class MatchProcessingOp
  63   {
  64     const char *target;
  65
  66   public:
  67     MatchProcessingOp(const char *the_target)
  68       : target(the_target)
  69     {
  70     }
  71
  72     bool operator()(const std::pair<const char *, const char *> &pair) const
  73     {
  74       return strcmp(pair.first, target) == 0;
  75     }
  76   };
  77 }
  78
  79 /* helper function to ionice the given PID
  80
  81  there is no C header for ionice yet - just the syscall interface
  82  so we use the binary from util-linux
  83 */
  84 static bool
  85 ionice(int PID)
  86 {
  87    if (!FileExists("/usr/bin/ionice"))
  88       return false;
  89    pid_t Process = ExecFork();
  90    if (Process == 0)
  91    {
  92       char buf[32];
  93       snprintf(buf, sizeof(buf), "-p%d", PID);
  94       const char *Args[4];
  95       Args[0] = "/usr/bin/ionice";
  96       Args[1] = "-c3";
  97       Args[2] = buf;
  98       Args[3] = 0;
  99       execv(Args[0], (char **)Args);
 100    }
 101    return ExecWait(Process, "ionice");
 102 }
 103
 104 // DPkgPM::pkgDPkgPM - Constructor                                      /*{{{*/
 105 // ---------------------------------------------------------------------
 106 /* */
 107 pkgDPkgPM::pkgDPkgPM(pkgDepCache *Cache)
 108    : pkgPackageManager(Cache), dpkgbuf_pos(0),
 109      term_out(NULL), PackagesDone(0), PackagesTotal(0), pkgFailures(0)
 110 {
 111 }
 112                                                                         /*}}}*/
 113 // DPkgPM::pkgDPkgPM - Destructor                                       /*{{{*/
 114 // ---------------------------------------------------------------------
 115 /* */
 116 pkgDPkgPM::~pkgDPkgPM()
 117 {
 118 }
 119                                                                         /*}}}*/
 120 // DPkgPM::Install - Install a package                                  /*{{{*/
 121 // ---------------------------------------------------------------------
 122 /* Add an install operation to the sequence list */
 123 bool pkgDPkgPM::Install(PkgIterator Pkg,string File)
 124 {
 125    if (File.empty() == true || Pkg.end() == true)
 126       return _error->Error("Internal Error, No file name for %s",Pkg.Name());
 127
 128    List.push_back(Item(Item::Install,Pkg,File));
 129    return true;
 130 }
 131                                                                         /*}}}*/
 132 // DPkgPM::Configure - Configure a package                              /*{{{*/
 133 // ---------------------------------------------------------------------
 134 /* Add a configure operation to the sequence list */
 135 bool pkgDPkgPM::Configure(PkgIterator Pkg)
 136 {
 137    if (Pkg.end() == true)
 138       return false;
 139
 140    List.push_back(Item(Item::Configure, Pkg));
 141
 142    // Use triggers for config calls if we configure "smart"
 143    // as otherwise Pre-Depends will not be satisfied, see #526774
 144    if (_config->FindB("DPkg::TriggersPending", false) == true)
 145       List.push_back(Item(Item::TriggersPending, PkgIterator()));
 146
 147    return true;
 148 }
 149                                                                         /*}}}*/
 150 // DPkgPM::Remove - Remove a package                                    /*{{{*/
 151 // ---------------------------------------------------------------------
 152 /* Add a remove operation to the sequence list */
 153 bool pkgDPkgPM::Remove(PkgIterator Pkg,bool Purge)
 154 {
 155    if (Pkg.end() == true)
 156       return false;
 157
 158    if (Purge == true)
 159       List.push_back(Item(Item::Purge,Pkg));
 160    else
 161       List.push_back(Item(Item::Remove,Pkg));
 162    return true;
 163 }
 164                                                                         /*}}}*/
 165 // DPkgPM::SendV2Pkgs - Send version 2 package info                     /*{{{*/
 166 // ---------------------------------------------------------------------
 167 /* This is part of the helper script communication interface, it sends
 168    very complete information down to the other end of the pipe.*/
 169 bool pkgDPkgPM::SendV2Pkgs(FILE *F)
 170 {
 171    fprintf(F,"VERSION 2\n");
 172
 173    /* Write out all of the configuration directives by walking the
 174       configuration tree */
 175    const Configuration::Item *Top = _config->Tree(0);
 176    for (; Top != 0;)
 177    {
 178       if (Top->Value.empty() == false)
 179       {
 180          fprintf(F,"%s=%s\n",
 181                  QuoteString(Top->FullTag(),"=\"\n").c_str(),
 182                  QuoteString(Top->Value,"\n").c_str());
 183       }
 184
 185       if (Top->Child != 0)
 186       {
 187          Top = Top->Child;
 188          continue;
 189       }
 190
 191       while (Top != 0 && Top->Next == 0)
 192          Top = Top->Parent;
 193       if (Top != 0)
 194          Top = Top->Next;
 195    }
 196    fprintf(F,"\n");
 197
 198    // Write out the package actions in order.
 199    for (vector<Item>::iterator I = List.begin(); I != List.end(); I++)
 200    {
 201       if(I->Pkg.end() == true)
 202          continue;
 203
 204       pkgDepCache::StateCache &S = Cache[I->Pkg];
 205
 206       fprintf(F,"%s ",I->Pkg.Name());
 207       // Current version
 208       if (I->Pkg->CurrentVer == 0)
 209          fprintf(F,"- ");
 210       else
 211          fprintf(F,"%s ",I->Pkg.CurrentVer().VerStr());
 212
 213       // Show the compare operator
 214       // Target version
 215       if (S.InstallVer != 0)
 216       {
 217          int Comp = 2;
 218          if (I->Pkg->CurrentVer != 0)
 219             Comp = S.InstVerIter(Cache).CompareVer(I->Pkg.CurrentVer());
 220          if (Comp < 0)
 221             fprintf(F,"> ");
 222          if (Comp == 0)
 223             fprintf(F,"= ");
 224          if (Comp > 0)
 225             fprintf(F,"< ");
 226          fprintf(F,"%s ",S.InstVerIter(Cache).VerStr());
 227       }
 228       else
 229          fprintf(F,"> - ");
 230
 231       // Show the filename/operation
 232       if (I->Op == Item::Install)
 233       {
 234          // No errors here..
 235          if (I->File[0] != '/')
 236             fprintf(F,"**ERROR**\n");
 237          else
 238             fprintf(F,"%s\n",I->File.c_str());
 239       }
 240       if (I->Op == Item::Configure)
 241          fprintf(F,"**CONFIGURE**\n");
 242       if (I->Op == Item::Remove ||
 243           I->Op == Item::Purge)
 244          fprintf(F,"**REMOVE**\n");
 245
 246       if (ferror(F) != 0)
 247          return false;
 248    }
 249    return true;
 250 }
 251                                                                         /*}}}*/
 252 // DPkgPM::RunScriptsWithPkgs - Run scripts with package names on stdin /*{{{*/
 253 // ---------------------------------------------------------------------
 254 /* This looks for a list of scripts to run from the configuration file
 255    each one is run and is fed on standard input a list of all .deb files
 256    that are due to be installed. */
 257 bool pkgDPkgPM::RunScriptsWithPkgs(const char *Cnf)
 258 {
 259    Configuration::Item const *Opts = _config->Tree(Cnf);
 260    if (Opts == 0 || Opts->Child == 0)
 261       return true;
 262    Opts = Opts->Child;
 263
 264    unsigned int Count = 1;
 265    for (; Opts != 0; Opts = Opts->Next, Count++)
 266    {
 267       if (Opts->Value.empty() == true)
 268          continue;
 269
 270       // Determine the protocol version
 271       string OptSec = Opts->Value;
 272       string::size_type Pos;
 273       if ((Pos = OptSec.find(' ')) == string::npos || Pos == 0)
 274          Pos = OptSec.length();
 275       OptSec = "DPkg::Tools::Options::" + string(Opts->Value.c_str(),Pos);
 276
 277       unsigned int Version = _config->FindI(OptSec+"::Version",1);
 278
 279       // Create the pipes
 280       int Pipes[2];
 281       if (pipe(Pipes) != 0)
 282          return _error->Errno("pipe","Failed to create IPC pipe to subprocess");
 283       SetCloseExec(Pipes[0],true);
 284       SetCloseExec(Pipes[1],true);
 285
 286       // Purified Fork for running the script
 287       pid_t Process = ExecFork();
 288       if (Process == 0)
 289       {
 290          // Setup the FDs
 291          dup2(Pipes[0],STDIN_FILENO);
 292          SetCloseExec(STDOUT_FILENO,false);
 293          SetCloseExec(STDIN_FILENO,false);
 294          SetCloseExec(STDERR_FILENO,false);
 295
 296          const char *Args[4];
 297          Args[0] = "/bin/sh";
 298          Args[1] = "-c";
 299          Args[2] = Opts->Value.c_str();
 300          Args[3] = 0;
 301          execv(Args[0],(char **)Args);
 302          _exit(100);
 303       }
 304       close(Pipes[0]);
 305       FILE *F = fdopen(Pipes[1],"w");
 306       if (F == 0)
 307          return _error->Errno("fdopen","Faild to open new FD");
 308
 309       // Feed it the filenames.
 310       bool Die = false;
 311       if (Version <= 1)
 312       {
 313          for (vector<Item>::iterator I = List.begin(); I != List.end(); I++)
 314          {
 315             // Only deal with packages to be installed from .deb
 316             if (I->Op != Item::Install)
 317                continue;
 318
 319             // No errors here..
 320             if (I->File[0] != '/')
 321                continue;
 322
 323             /* Feed the filename of each package that is pending install
 324                into the pipe. */
 325             fprintf(F,"%s\n",I->File.c_str());
 326             if (ferror(F) != 0)
 327             {
 328                Die = true;
 329                break;
 330             }
 331          }
 332       }
 333       else
 334          Die = !SendV2Pkgs(F);
 335
 336       fclose(F);
 337
 338       // Clean up the sub process
 339       if (ExecWait(Process,Opts->Value.c_str()) == false)
 340          return _error->Error("Failure running script %s",Opts->Value.c_str());
 341    }
 342
 343    return true;
 344 }
 345                                                                         /*}}}*/
 346 // DPkgPM::DoStdin - Read stdin and pass to slave pty                   /*{{{*/
 347 // ---------------------------------------------------------------------
 348 /*
 349 */
 350 void pkgDPkgPM::DoStdin(int master)
 351 {
 352    unsigned char input_buf[256] = {0,};
 353    ssize_t len = read(0, input_buf, sizeof(input_buf));
 354    if (len)
 355       write(master, input_buf, len);
 356    else
 357       stdin_is_dev_null = true;
 358 }
 359                                                                         /*}}}*/
 360 // DPkgPM::DoTerminalPty - Read the terminal pty and write log          /*{{{*/
 361 // ---------------------------------------------------------------------
 362 /*
 363  * read the terminal pty and write log
 364  */
 365 void pkgDPkgPM::DoTerminalPty(int master)
 366 {
 367    unsigned char term_buf[1024] = {0,0, };
 368
 369    ssize_t len=read(master, term_buf, sizeof(term_buf));
 370    if(len == -1 && errno == EIO)
 371    {
 372       // this happens when the child is about to exit, we
 373       // give it time to actually exit, otherwise we run
 374       // into a race
 375       usleep(500000);
 376       return;
 377    }
 378    if(len <= 0)
 379       return;
 380    write(1, term_buf, len);
 381    if(term_out)
 382       fwrite(term_buf, len, sizeof(char), term_out);
 383 }
 384                                                                         /*}}}*/
 385 // DPkgPM::ProcessDpkgStatusBuf                                         /*{{{*/
 386 // ---------------------------------------------------------------------
 387 /*
 388  */
 389 void pkgDPkgPM::ProcessDpkgStatusLine(int OutStatusFd, char *line)
 390 {
 391    bool const Debug = _config->FindB("Debug::pkgDPkgProgressReporting",false);
 392    // the status we output
 393    ostringstream status;
 394
 395    if (Debug == true)
 396       std::clog << "got from dpkg '" << line << "'" << std::endl;
 397
 398
 399    /* dpkg sends strings like this:
 400       'status:   <pkg>:  <pkg  qstate>'
 401       errors look like this:
 402       '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
 403       and conffile-prompt like this
 404       'status: conffile-prompt: conffile : 'current-conffile' 'new-conffile' useredited distedited
 405
 406       Newer versions of dpkg sent also:
 407       'processing: install: pkg'
 408       'processing: configure: pkg'
 409       'processing: remove: pkg'
 410       'processing: purge: pkg' - but for apt is it a ignored "unknown" action
 411       'processing: trigproc: trigger'
 412
 413    */
 414    char* list[6];
 415    //        dpkg sends multiline error messages sometimes (see
 416    //        #374195 for a example. we should support this by
 417    //        either patching dpkg to not send multiline over the
 418    //        statusfd or by rewriting the code here to deal with
 419    //        it. for now we just ignore it and not crash
 420    TokSplitString(':', line, list, sizeof(list)/sizeof(list[0]));
 421    if( list[0] == NULL || list[1] == NULL || list[2] == NULL)
 422    {
 423       if (Debug == true)
 424          std::clog << "ignoring line: not enough ':'" << std::endl;
 425       return;
 426    }
 427    const char* const pkg = list[1];
 428    const char* action = _strstrip(list[2]);
 429
 430    // 'processing' from dpkg looks like
 431    // 'processing: action: pkg'
 432    if(strncmp(list[0], "processing", strlen("processing")) == 0)
 433    {
 434       char s[200];
 435       const char* const pkg_or_trigger = _strstrip(list[2]);
 436       action = _strstrip( list[1]);
 437       const std::pair<const char *, const char *> * const iter =
 438         std::find_if(PackageProcessingOpsBegin,
 439                      PackageProcessingOpsEnd,
 440                      MatchProcessingOp(action));
 441       if(iter == PackageProcessingOpsEnd)
 442       {
 443          if (Debug == true)
 444             std::clog << "ignoring unknown action: " << action << std::endl;
 445          return;
 446       }
 447       snprintf(s, sizeof(s), _(iter->second), pkg_or_trigger);
 448
 449       status << "pmstatus:" << pkg_or_trigger
 450              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 451              << ":" << s
 452              << endl;
 453       if(OutStatusFd > 0)
 454          write(OutStatusFd, status.str().c_str(), status.str().size());
 455       if (Debug == true)
 456          std::clog << "send: '" << status.str() << "'" << endl;
 457       return;
 458    }
 459
 460    if(strncmp(action,"error",strlen("error")) == 0)
 461    {
 462       // urgs, sometime has ":" in its error string so that we
 463       // end up with the error message split between list[3]
 464       // and list[4], e.g. the message:
 465       // "failed in buffer_write(fd) (10, ret=-1): backend dpkg-deb ..."
 466       // concat them again
 467       if( list[4] != NULL )
 468          list[3][strlen(list[3])] = ':';
 469
 470       status << "pmerror:" << list[1]
 471              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 472              << ":" << list[3]
 473              << endl;
 474       if(OutStatusFd > 0)
 475          write(OutStatusFd, status.str().c_str(), status.str().size());
 476       if (Debug == true)
 477          std::clog << "send: '" << status.str() << "'" << endl;
 478       pkgFailures++;
 479       WriteApportReport(list[1], list[3]);
 480       return;
 481    }
 482    else if(strncmp(action,"conffile",strlen("conffile")) == 0)
 483    {
 484       status << "pmconffile:" << list[1]
 485              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 486              << ":" << list[3]
 487              << endl;
 488       if(OutStatusFd > 0)
 489          write(OutStatusFd, status.str().c_str(), status.str().size());
 490       if (Debug == true)
 491          std::clog << "send: '" << status.str() << "'" << endl;
 492       return;
 493    }
 494
 495    vector<struct DpkgState> const &states = PackageOps[pkg];
 496    const char *next_action = NULL;
 497    if(PackageOpsDone[pkg] < states.size())
 498       next_action = states[PackageOpsDone[pkg]].state;
 499    // check if the package moved to the next dpkg state
 500    if(next_action && (strcmp(action, next_action) == 0))
 501    {
 502       // only read the translation if there is actually a next
 503       // action
 504       const char *translation = _(states[PackageOpsDone[pkg]].str);
 505       char s[200];
 506       snprintf(s, sizeof(s), translation, pkg);
 507
 508       // we moved from one dpkg state to a new one, report that
 509       PackageOpsDone[pkg]++;
 510       PackagesDone++;
 511       // build the status str
 512       status << "pmstatus:" << pkg
 513              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 514              << ":" << s
 515              << endl;
 516       if(OutStatusFd > 0)
 517          write(OutStatusFd, status.str().c_str(), status.str().size());
 518       if (Debug == true)
 519          std::clog << "send: '" << status.str() << "'" << endl;
 520    }
 521    if (Debug == true)
 522       std::clog << "(parsed from dpkg) pkg: " << pkg
 523                 << " action: " << action << endl;
 524 }
 525                                                                         /*}}}*/
 526 // DPkgPM::DoDpkgStatusFd                                               /*{{{*/
 527 // ---------------------------------------------------------------------
 528 /*
 529  */
 530 void pkgDPkgPM::DoDpkgStatusFd(int statusfd, int OutStatusFd)
 531 {
 532    char *p, *q;
 533    int len;
 534
 535    len=read(statusfd, &dpkgbuf[dpkgbuf_pos], sizeof(dpkgbuf)-dpkgbuf_pos);
 536    dpkgbuf_pos += len;
 537    if(len <= 0)
 538       return;
 539
 540    // process line by line if we have a buffer
 541    p = q = dpkgbuf;
 542    while((q=(char*)memchr(p, '\n', dpkgbuf+dpkgbuf_pos-p)) != NULL)
 543    {
 544       *q = 0;
 545       ProcessDpkgStatusLine(OutStatusFd, p);
 546       p=q+1; // continue with next line
 547    }
 548
 549    // now move the unprocessed bits (after the final \n that is now a 0x0)
 550    // to the start and update dpkgbuf_pos
 551    p = (char*)memrchr(dpkgbuf, 0, dpkgbuf_pos);
 552    if(p == NULL)
 553       return;
 554
 555    // we are interessted in the first char *after* 0x0
 556    p++;
 557
 558    // move the unprocessed tail to the start and update pos
 559    memmove(dpkgbuf, p, p-dpkgbuf);
 560    dpkgbuf_pos = dpkgbuf+dpkgbuf_pos-p;
 561 }
 562                                                                         /*}}}*/
 563 // DPkgPM::OpenLog                                                      /*{{{*/
 564 bool pkgDPkgPM::OpenLog()
 565 {
 566    string logdir = _config->FindDir("Dir::Log");
 567    if(not FileExists(logdir))
 568       return _error->Error(_("Directory '%s' missing"), logdir.c_str());
 569    string logfile_name = flCombine(logdir,
 570                                    _config->Find("Dir::Log::Terminal"));
 571    if (!logfile_name.empty())
 572    {
 573       term_out = fopen(logfile_name.c_str(),"a");
 574       chmod(logfile_name.c_str(), 0600);
 575       // output current time
 576       char outstr[200];
 577       time_t t = time(NULL);
 578       struct tm *tmp = localtime(&t);
 579       strftime(outstr, sizeof(outstr), "%F  %T", tmp);
 580       fprintf(term_out, "\nLog started: ");
 581       fprintf(term_out, "%s", outstr);
 582       fprintf(term_out, "\n");
 583    }
 584    return true;
 585 }
 586                                                                         /*}}}*/
 587 // DPkg::CloseLog                                                       /*{{{*/
 588 bool pkgDPkgPM::CloseLog()
 589 {
 590    if(term_out)
 591    {
 592       char outstr[200];
 593       time_t t = time(NULL);
 594       struct tm *tmp = localtime(&t);
 595       strftime(outstr, sizeof(outstr), "%F  %T", tmp);
 596       fprintf(term_out, "Log ended: ");
 597       fprintf(term_out, "%s", outstr);
 598       fprintf(term_out, "\n");
 599       fclose(term_out);
 600    }
 601    term_out = NULL;
 602    return true;
 603 }
 604                                                                         /*}}}*/
 605 /*{{{*/
 606 // This implements a racy version of pselect for those architectures
 607 // that don't have a working implementation.
 608 // FIXME: Probably can be removed on Lenny+1
 609 static int racy_pselect(int nfds, fd_set *readfds, fd_set *writefds,
 610    fd_set *exceptfds, const struct timespec *timeout,
 611    const sigset_t *sigmask)
 612 {
 613    sigset_t origmask;
 614    struct timeval tv;
 615    int retval;
 616
 617    tv.tv_sec = timeout->tv_sec;
 618    tv.tv_usec = timeout->tv_nsec/1000;
 619
 620    sigprocmask(SIG_SETMASK, sigmask, &origmask);
 621    retval = select(nfds, readfds, writefds, exceptfds, &tv);
 622    sigprocmask(SIG_SETMASK, &origmask, 0);
 623    return retval;
 624 }
 625 /*}}}*/
 626 // DPkgPM::Go - Run the sequence                                        /*{{{*/
 627 // ---------------------------------------------------------------------
 628 /* This globs the operations and calls dpkg
 629  *
 630  * If it is called with "OutStatusFd" set to a valid file descriptor
 631  * apt will report the install progress over this fd. It maps the
 632  * dpkg states a package goes through to human readable (and i10n-able)
 633  * names and calculates a percentage for each step.
 634 */
 635 bool pkgDPkgPM::Go(int OutStatusFd)
 636 {
 637    fd_set rfds;
 638    struct timespec tv;
 639    sigset_t sigmask;
 640    sigset_t original_sigmask;
 641
 642    unsigned int const MaxArgs = _config->FindI("Dpkg::MaxArgs",8*1024);
 643    unsigned int const MaxArgBytes = _config->FindI("Dpkg::MaxArgBytes",32*1024);
 644    bool const NoTriggers = _config->FindB("DPkg::NoTriggers", false);
 645
 646    if (RunScripts("DPkg::Pre-Invoke") == false)
 647       return false;
 648
 649    if (RunScriptsWithPkgs("DPkg::Pre-Install-Pkgs") == false)
 650       return false;
 651
 652    // support subpressing of triggers processing for special
 653    // cases like d-i that runs the triggers handling manually
 654    bool const SmartConf = (_config->Find("PackageManager::Configure", "all") != "all");
 655    bool const TriggersPending = _config->FindB("DPkg::TriggersPending", false);
 656    if (_config->FindB("DPkg::ConfigurePending", SmartConf) == true)
 657       List.push_back(Item(Item::ConfigurePending, PkgIterator()));
 658
 659    // map the dpkg states to the operations that are performed
 660    // (this is sorted in the same way as Item::Ops)
 661    static const struct DpkgState DpkgStatesOpMap[][7] = {
 662       // Install operation
 663       {
 664          {"half-installed", N_("Preparing %s")},
 665          {"unpacked", N_("Unpacking %s") },
 666          {NULL, NULL}
 667       },
 668       // Configure operation
 669       {
 670          {"unpacked",N_("Preparing to configure %s") },
 671          {"half-configured", N_("Configuring %s") },
 672          { "installed", N_("Installed %s")},
 673          {NULL, NULL}
 674       },
 675       // Remove operation
 676       {
 677          {"half-configured", N_("Preparing for removal of %s")},
 678          {"half-installed", N_("Removing %s")},
 679          {"config-files",  N_("Removed %s")},
 680          {NULL, NULL}
 681       },
 682       // Purge operation
 683       {
 684          {"config-files", N_("Preparing to completely remove %s")},
 685          {"not-installed", N_("Completely removed %s")},
 686          {NULL, NULL}
 687       },
 688    };
 689
 690    // init the PackageOps map, go over the list of packages that
 691    // that will be [installed|configured|removed|purged] and add
 692    // them to the PackageOps map (the dpkg states it goes through)
 693    // and the PackageOpsTranslations (human readable strings)
 694    for (vector<Item>::const_iterator I = List.begin(); I != List.end();I++)
 695    {
 696       if((*I).Pkg.end() == true)
 697          continue;
 698
 699       string const name = (*I).Pkg.Name();
 700       PackageOpsDone[name] = 0;
 701       for(int i=0; (DpkgStatesOpMap[(*I).Op][i]).state != NULL;  i++)
 702       {
 703          PackageOps[name].push_back(DpkgStatesOpMap[(*I).Op][i]);
 704          PackagesTotal++;
 705       }
 706    }
 707
 708    stdin_is_dev_null = false;
 709
 710    // create log
 711    OpenLog();
 712
 713    // this loop is runs once per operation
 714    for (vector<Item>::const_iterator I = List.begin(); I != List.end();)
 715    {
 716       // Do all actions with the same Op in one run
 717       vector<Item>::const_iterator J = I;
 718       if (TriggersPending == true)
 719          for (; J != List.end(); J++)
 720          {
 721             if (J->Op == I->Op)
 722                continue;
 723             if (J->Op != Item::TriggersPending)
 724                break;
 725             vector<Item>::const_iterator T = J + 1;
 726             if (T != List.end() && T->Op == I->Op)
 727                continue;
 728             break;
 729          }
 730       else
 731          for (; J != List.end() && J->Op == I->Op; J++)
 732             /* nothing */;
 733
 734       // Generate the argument list
 735       const char *Args[MaxArgs + 50];
 736
 737       // Now check if we are within the MaxArgs limit
 738       //
 739       // this code below is problematic, because it may happen that
 740       // the argument list is split in a way that A depends on B
 741       // and they are in the same "--configure A B" run
 742       // - with the split they may now be configured in different
 743       //   runs
 744       if (J - I > (signed)MaxArgs)
 745          J = I + MaxArgs;
 746
 747       unsigned int n = 0;
 748       unsigned long Size = 0;
 749       string const Tmp = _config->Find("Dir::Bin::dpkg","dpkg");
 750       Args[n++] = Tmp.c_str();
 751       Size += strlen(Args[n-1]);
 752
 753       // Stick in any custom dpkg options
 754       Configuration::Item const *Opts = _config->Tree("DPkg::Options");
 755       if (Opts != 0)
 756       {
 757          Opts = Opts->Child;
 758          for (; Opts != 0; Opts = Opts->Next)
 759          {
 760             if (Opts->Value.empty() == true)
 761                continue;
 762             Args[n++] = Opts->Value.c_str();
 763             Size += Opts->Value.length();
 764          }
 765       }
 766
 767       char status_fd_buf[20];
 768       int fd[2];
 769       pipe(fd);
 770
 771       Args[n++] = "--status-fd";
 772       Size += strlen(Args[n-1]);
 773       snprintf(status_fd_buf,sizeof(status_fd_buf),"%i", fd[1]);
 774       Args[n++] = status_fd_buf;
 775       Size += strlen(Args[n-1]);
 776
 777       switch (I->Op)
 778       {
 779          case Item::Remove:
 780          Args[n++] = "--force-depends";
 781          Size += strlen(Args[n-1]);
 782          Args[n++] = "--force-remove-essential";
 783          Size += strlen(Args[n-1]);
 784          Args[n++] = "--remove";
 785          Size += strlen(Args[n-1]);
 786          break;
 787
 788          case Item::Purge:
 789          Args[n++] = "--force-depends";
 790          Size += strlen(Args[n-1]);
 791          Args[n++] = "--force-remove-essential";
 792          Size += strlen(Args[n-1]);
 793          Args[n++] = "--purge";
 794          Size += strlen(Args[n-1]);
 795          break;
 796
 797          case Item::Configure:
 798          Args[n++] = "--configure";
 799          Size += strlen(Args[n-1]);
 800          break;
 801
 802          case Item::ConfigurePending:
 803          Args[n++] = "--configure";
 804          Size += strlen(Args[n-1]);
 805          Args[n++] = "--pending";
 806          Size += strlen(Args[n-1]);
 807          break;
 808
 809          case Item::TriggersPending:
 810          Args[n++] = "--triggers-only";
 811          Size += strlen(Args[n-1]);
 812          Args[n++] = "--pending";
 813          Size += strlen(Args[n-1]);
 814          break;
 815
 816          case Item::Install:
 817          Args[n++] = "--unpack";
 818          Size += strlen(Args[n-1]);
 819          Args[n++] = "--auto-deconfigure";
 820          Size += strlen(Args[n-1]);
 821          break;
 822       }
 823
 824       if (NoTriggers == true && I->Op != Item::TriggersPending &&
 825           I->Op != Item::ConfigurePending)
 826       {
 827          Args[n++] = "--no-triggers";
 828          Size += strlen(Args[n-1]);
 829       }
 830
 831       // Write in the file or package names
 832       if (I->Op == Item::Install)
 833       {
 834          for (;I != J && Size < MaxArgBytes; I++)
 835          {
 836             if (I->File[0] != '/')
 837                return _error->Error("Internal Error, Pathname to install is not absolute '%s'",I->File.c_str());
 838             Args[n++] = I->File.c_str();
 839             Size += strlen(Args[n-1]);
 840          }
 841       }
 842       else
 843       {
 844          for (;I != J && Size < MaxArgBytes; I++)
 845          {
 846             if((*I).Pkg.end() == true)
 847                continue;
 848             Args[n++] = I->Pkg.Name();
 849             Size += strlen(Args[n-1]);
 850          }
 851       }
 852       Args[n] = 0;
 853       J = I;
 854
 855       if (_config->FindB("Debug::pkgDPkgPM",false) == true)
 856       {
 857          for (unsigned int k = 0; k != n; k++)
 858             clog << Args[k] << ' ';
 859          clog << endl;
 860          continue;
 861       }
 862
 863       cout << flush;
 864       clog << flush;
 865       cerr << flush;
 866
 867       /* Mask off sig int/quit. We do this because dpkg also does when
 868          it forks scripts. What happens is that when you hit ctrl-c it sends
 869          it to all processes in the group. Since dpkg ignores the signal
 870          it doesn't die but we do! So we must also ignore it */
 871       sighandler_t old_SIGQUIT = signal(SIGQUIT,SIG_IGN);
 872       sighandler_t old_SIGINT = signal(SIGINT,SIG_IGN);
 873
 874       // ignore SIGHUP as well (debian #463030)
 875       sighandler_t old_SIGHUP = signal(SIGHUP,SIG_IGN);
 876
 877       struct    termios tt;
 878       struct    winsize win;
 879       int       master = -1;
 880       int       slave = -1;
 881
 882       // if tcgetattr does not return zero there was a error
 883       // and we do not do any pty magic
 884       if (tcgetattr(0, &tt) == 0)
 885       {
 886          ioctl(0, TIOCGWINSZ, (char *)&win);
 887          if (openpty(&master, &slave, NULL, &tt, &win) < 0)
 888          {
 889             const char *s = _("Can not write log, openpty() "
 890                               "failed (/dev/pts not mounted?)\n");
 891             fprintf(stderr, "%s",s);
 892             fprintf(term_out, "%s",s);
 893             master = slave = -1;
 894          }  else {
 895             struct termios rtt;
 896             rtt = tt;
 897             cfmakeraw(&rtt);
 898             rtt.c_lflag &= ~ECHO;
 899             // block SIGTTOU during tcsetattr to prevent a hang if
 900             // the process is a member of the background process group
 901             // http://www.opengroup.org/onlinepubs/000095399/functions/tcsetattr.html
 902             sigemptyset(&sigmask);
 903             sigaddset(&sigmask, SIGTTOU);
 904             sigprocmask(SIG_BLOCK,&sigmask, &original_sigmask);
 905             tcsetattr(0, TCSAFLUSH, &rtt);
 906             sigprocmask(SIG_SETMASK, &original_sigmask, 0);
 907          }
 908       }
 909
 910        // Fork dpkg
 911       pid_t Child;
 912       _config->Set("APT::Keep-Fds::",fd[1]);
 913       // send status information that we are about to fork dpkg
 914       if(OutStatusFd > 0) {
 915          ostringstream status;
 916          status << "pmstatus:dpkg-exec:"
 917                 << (PackagesDone/float(PackagesTotal)*100.0)
 918                 << ":" << _("Running dpkg")
 919                 << endl;
 920          write(OutStatusFd, status.str().c_str(), status.str().size());
 921       }
 922       Child = ExecFork();
 923
 924       // This is the child
 925       if (Child == 0)
 926       {
 927          if(slave >= 0 && master >= 0)
 928          {
 929             setsid();
 930             ioctl(slave, TIOCSCTTY, 0);
 931             close(master);
 932             dup2(slave, 0);
 933             dup2(slave, 1);
 934             dup2(slave, 2);
 935             close(slave);
 936          }
 937          close(fd[0]); // close the read end of the pipe
 938
 939          if (_config->FindDir("DPkg::Chroot-Directory","/") != "/")
 940          {
 941             std::cerr << "Chrooting into "
 942                       << _config->FindDir("DPkg::Chroot-Directory")
 943                       << std::endl;
 944             if (chroot(_config->FindDir("DPkg::Chroot-Directory","/").c_str()) != 0)
 945                _exit(100);
 946          }
 947
 948          if (chdir(_config->FindDir("DPkg::Run-Directory","/").c_str()) != 0)
 949             _exit(100);
 950
 951          if (_config->FindB("DPkg::FlushSTDIN",true) == true && isatty(STDIN_FILENO))
 952          {
 953             int Flags,dummy;
 954             if ((Flags = fcntl(STDIN_FILENO,F_GETFL,dummy)) < 0)
 955                _exit(100);
 956
 957             // Discard everything in stdin before forking dpkg
 958             if (fcntl(STDIN_FILENO,F_SETFL,Flags | O_NONBLOCK) < 0)
 959                _exit(100);
 960
 961             while (read(STDIN_FILENO,&dummy,1) == 1);
 962
 963             if (fcntl(STDIN_FILENO,F_SETFL,Flags & (~(long)O_NONBLOCK)) < 0)
 964                _exit(100);
 965          }
 966
 967          /* No Job Control Stop Env is a magic dpkg var that prevents it
 968             from using sigstop */
 969          putenv((char *)"DPKG_NO_TSTP=yes");
 970          execvp(Args[0],(char **)Args);
 971          cerr << "Could not exec dpkg!" << endl;
 972          _exit(100);
 973       }
 974
 975       // apply ionice
 976       if (_config->FindB("DPkg::UseIoNice", false) == true)
 977          ionice(Child);
 978
 979       // clear the Keep-Fd again
 980       _config->Clear("APT::Keep-Fds",fd[1]);
 981
 982       // Wait for dpkg
 983       int Status = 0;
 984
 985       // we read from dpkg here
 986       int const _dpkgin = fd[0];
 987       close(fd[1]);                        // close the write end of the pipe
 988
 989       if(slave > 0)
 990          close(slave);
 991
 992       // setups fds
 993       sigemptyset(&sigmask);
 994       sigprocmask(SIG_BLOCK,&sigmask,&original_sigmask);
 995
 996       // the result of the waitpid call
 997       int res;
 998       int select_ret;
 999       while ((res=waitpid(Child,&Status, WNOHANG)) != Child) {
1000          if(res < 0) {
1001             // FIXME: move this to a function or something, looks ugly here
1002             // error handling, waitpid returned -1
1003             if (errno == EINTR)
1004                continue;
1005             RunScripts("DPkg::Post-Invoke");
1006
1007             // Restore sig int/quit
1008             signal(SIGQUIT,old_SIGQUIT);
1009             signal(SIGINT,old_SIGINT);
1010             signal(SIGHUP,old_SIGHUP);
1011             return _error->Errno("waitpid","Couldn't wait for subprocess");
1012          }
1013          // wait for input or output here
1014          FD_ZERO(&rfds);
1015          if (!stdin_is_dev_null)
1016             FD_SET(0, &rfds);
1017          FD_SET(_dpkgin, &rfds);
1018          if(master >= 0)
1019             FD_SET(master, &rfds);
1020          tv.tv_sec = 1;
1021          tv.tv_nsec = 0;
1022          select_ret = pselect(max(master, _dpkgin)+1, &rfds, NULL, NULL,
1023                               &tv, &original_sigmask);
1024          if (select_ret < 0 && (errno == EINVAL || errno == ENOSYS))
1025             select_ret = racy_pselect(max(master, _dpkgin)+1, &rfds, NULL,
1026                                       NULL, &tv, &original_sigmask);
1027          if (select_ret == 0)
1028             continue;
1029          else if (select_ret < 0 && errno == EINTR)
1030             continue;
1031          else if (select_ret < 0)
1032          {
1033             perror("select() returned error");
1034             continue;
1035          }
1036
1037          if(master >= 0 && FD_ISSET(master, &rfds))
1038             DoTerminalPty(master);
1039          if(master >= 0 && FD_ISSET(0, &rfds))
1040             DoStdin(master);
1041          if(FD_ISSET(_dpkgin, &rfds))
1042             DoDpkgStatusFd(_dpkgin, OutStatusFd);
1043       }
1044       close(_dpkgin);
1045
1046       // Restore sig int/quit
1047       signal(SIGQUIT,old_SIGQUIT);
1048       signal(SIGINT,old_SIGINT);
1049       signal(SIGHUP,old_SIGHUP);
1050
1051       if(master >= 0)
1052       {
1053          tcsetattr(0, TCSAFLUSH, &tt);
1054          close(master);
1055       }
1056
1057       // Check for an error code.
1058       if (WIFEXITED(Status) == 0 || WEXITSTATUS(Status) != 0)
1059       {
1060          // if it was set to "keep-dpkg-runing" then we won't return
1061          // here but keep the loop going and just report it as a error
1062          // for later
1063          bool const stopOnError = _config->FindB("Dpkg::StopOnError",true);
1064
1065          if(stopOnError)
1066             RunScripts("DPkg::Post-Invoke");
1067
1068          if (WIFSIGNALED(Status) != 0 && WTERMSIG(Status) == SIGSEGV)
1069             _error->Error("Sub-process %s received a segmentation fault.",Args[0]);
1070          else if (WIFEXITED(Status) != 0)
1071             _error->Error("Sub-process %s returned an error code (%u)",Args[0],WEXITSTATUS(Status));
1072          else
1073             _error->Error("Sub-process %s exited unexpectedly",Args[0]);
1074
1075          if(stopOnError)
1076          {
1077             CloseLog();
1078             return false;
1079          }
1080       }
1081    }
1082    CloseLog();
1083
1084    if (RunScripts("DPkg::Post-Invoke") == false)
1085       return false;
1086
1087    Cache.writeStateFile(NULL);
1088    return true;
1089 }
1090                                                                         /*}}}*/
1091 // pkgDpkgPM::Reset - Dump the contents of the command list             /*{{{*/
1092 // ---------------------------------------------------------------------
1093 /* */
1094 void pkgDPkgPM::Reset()
1095 {
1096    List.erase(List.begin(),List.end());
1097 }
1098                                                                         /*}}}*/
1099 // pkgDpkgPM::WriteApportReport - write out error report pkg failure    /*{{{*/
1100 // ---------------------------------------------------------------------
1101 /* */
1102 void pkgDPkgPM::WriteApportReport(const char *pkgpath, const char *errormsg)
1103 {
1104    string pkgname, reportfile, srcpkgname, pkgver, arch;
1105    string::size_type pos;
1106    FILE *report;
1107
1108    if (_config->FindB("Dpkg::ApportFailureReport",true) == false)
1109    {
1110       std::clog << "configured to not write apport reports" << std::endl;
1111       return;
1112    }
1113
1114    // only report the first errors
1115    if(pkgFailures > _config->FindI("APT::Apport::MaxReports", 3))
1116    {
1117       std::clog << _("No apport report written because MaxReports is reached already") << std::endl;
1118       return;
1119    }
1120
1121    // check if its not a follow up error
1122    const char *needle = dgettext("dpkg", "dependency problems - leaving unconfigured");
1123    if(strstr(errormsg, needle) != NULL) {
1124       std::clog << _("No apport report written because the error message indicates its a followup error from a previous failure.") << std::endl;
1125       return;
1126    }
1127
1128    // do not report disk-full failures
1129    if(strstr(errormsg, strerror(ENOSPC)) != NULL) {
1130       std::clog << _("No apport report written because the error message indicates a disk full error") << std::endl;
1131       return;
1132    }
1133
1134    // do not report out-of-memory failures
1135    if(strstr(errormsg, strerror(ENOMEM)) != NULL) {
1136       std::clog << _("No apport report written because the error message indicates a out of memory error") << std::endl;
1137       return;
1138    }
1139
1140    // do not report dpkg I/O errors
1141    // XXX - this message is localized, but this only matches the English version.  This is better than nothing.
1142    if(strstr(errormsg, "short read in buffer_copy (")) {
1143       std::clog << _("No apport report written because the error message indicates a dpkg I/O error") << std::endl;
1144       return;
1145    }
1146
1147    // get the pkgname and reportfile
1148    pkgname = flNotDir(pkgpath);
1149    pos = pkgname.find('_');
1150    if(pos != string::npos)
1151       pkgname = pkgname.substr(0, pos);
1152
1153    // find the package versin and source package name
1154    pkgCache::PkgIterator Pkg = Cache.FindPkg(pkgname);
1155    if (Pkg.end() == true)
1156       return;
1157    pkgCache::VerIterator Ver = Cache.GetCandidateVer(Pkg);
1158    if (Ver.end() == true)
1159       return;
1160    pkgver = Ver.VerStr() == NULL ? "unknown" : Ver.VerStr();
1161    pkgRecords Recs(Cache);
1162    pkgRecords::Parser &Parse = Recs.Lookup(Ver.FileList());
1163    srcpkgname = Parse.SourcePkg();
1164    if(srcpkgname.empty())
1165       srcpkgname = pkgname;
1166
1167    // if the file exists already, we check:
1168    // - if it was reported already (touched by apport).
1169    //   If not, we do nothing, otherwise
1170    //    we overwrite it. This is the same behaviour as apport
1171    // - if we have a report with the same pkgversion already
1172    //   then we skip it
1173    reportfile = flCombine("/var/crash",pkgname+".0.crash");
1174    if(FileExists(reportfile))
1175    {
1176       struct stat buf;
1177       char strbuf[255];
1178
1179       // check atime/mtime
1180       stat(reportfile.c_str(), &buf);
1181       if(buf.st_mtime > buf.st_atime)
1182          return;
1183
1184       // check if the existing report is the same version
1185       report = fopen(reportfile.c_str(),"r");
1186       while(fgets(strbuf, sizeof(strbuf), report) != NULL)
1187       {
1188          if(strstr(strbuf,"Package:") == strbuf)
1189          {
1190             char pkgname[255], version[255];
1191             if(sscanf(strbuf, "Package: %s %s", pkgname, version) == 2)
1192                if(strcmp(pkgver.c_str(), version) == 0)
1193                {
1194                   fclose(report);
1195                   return;
1196                }
1197          }
1198       }
1199       fclose(report);
1200    }
1201
1202    // now write the report
1203    arch = _config->Find("APT::Architecture");
1204    report = fopen(reportfile.c_str(),"w");
1205    if(report == NULL)
1206       return;
1207    if(_config->FindB("DPkgPM::InitialReportOnly",false) == true)
1208       chmod(reportfile.c_str(), 0);
1209    else
1210       chmod(reportfile.c_str(), 0600);
1211    fprintf(report, "ProblemType: Package\n");
1212    fprintf(report, "Architecture: %s\n", arch.c_str());
1213    time_t now = time(NULL);
1214    fprintf(report, "Date: %s" , ctime(&now));
1215    fprintf(report, "Package: %s %s\n", pkgname.c_str(), pkgver.c_str());
1216    fprintf(report, "SourcePackage: %s\n", srcpkgname.c_str());
1217    fprintf(report, "ErrorMessage:\n %s\n", errormsg);
1218
1219    // ensure that the log is flushed
1220    if(term_out)
1221       fflush(term_out);
1222
1223    // attach terminal log it if we have it
1224    string logfile_name = _config->FindFile("Dir::Log::Terminal");
1225    if (!logfile_name.empty())
1226    {
1227       FILE *log = NULL;
1228       char buf[1024];
1229
1230       fprintf(report, "DpkgTerminalLog:\n");
1231       log = fopen(logfile_name.c_str(),"r");
1232       if(log != NULL)
1233       {
1234          while( fgets(buf, sizeof(buf), log) != NULL)
1235             fprintf(report, " %s", buf);
1236          fclose(log);
1237       }
1238    }
1239
1240    // log the ordering
1241    const char *ops_str[] = {"Install", "Configure","Remove","Purge"};
1242    fprintf(report, "AptOrdering:\n");
1243    for (vector<Item>::iterator I = List.begin(); I != List.end(); I++)
1244       fprintf(report, " %s: %s\n", (*I).Pkg.Name(), ops_str[(*I).Op]);
1245
1246    // attach dmesg log (to learn about segfaults)
1247    if (FileExists("/bin/dmesg"))
1248    {
1249       FILE *log = NULL;
1250       char buf[1024];
1251
1252       fprintf(report, "Dmesg:\n");
1253       log = popen("/bin/dmesg","r");
1254       if(log != NULL)
1255       {
1256          while( fgets(buf, sizeof(buf), log) != NULL)
1257             fprintf(report, " %s", buf);
1258          fclose(log);
1259       }
1260    }
1261
1262    // attach df -l log (to learn about filesystem status)
1263    if (FileExists("/bin/df"))
1264    {
1265       FILE *log = NULL;
1266       char buf[1024];
1267
1268       fprintf(report, "Df:\n");
1269       log = popen("/bin/df -l","r");
1270       if(log != NULL)
1271       {
1272          while( fgets(buf, sizeof(buf), log) != NULL)
1273             fprintf(report, " %s", buf);
1274          fclose(log);
1275       }
1276    }
1277
1278    fclose(report);
1279
1280 }
1281                                                                         /*}}}*/