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("purge",    N_("Completely removing %s")),
  53     std::make_pair("trigproc",  N_("Running post-installation trigger %s"))
  54   };
  55
  56   const std::pair<const char *, const char *> * const PackageProcessingOpsBegin = PackageProcessingOps;
  57   const std::pair<const char *, const char *> * const PackageProcessingOpsEnd   = PackageProcessingOps + sizeof(PackageProcessingOps) / sizeof(PackageProcessingOps[0]);
  58
  59   // Predicate to test whether an entry in the PackageProcessingOps
  60   // array matches a string.
  61   class MatchProcessingOp
  62   {
  63     const char *target;
  64
  65   public:
  66     MatchProcessingOp(const char *the_target)
  67       : target(the_target)
  68     {
  69     }
  70
  71     bool operator()(const std::pair<const char *, const char *> &pair) const
  72     {
  73       return strcmp(pair.first, target) == 0;
  74     }
  75   };
  76 }
  77
  78 /* helper function to ionice the given PID
  79
  80  there is no C header for ionice yet - just the syscall interface
  81  so we use the binary from util-linux
  82 */
  83 static bool
  84 ionice(int PID)
  85 {
  86    if (!FileExists("/usr/bin/ionice"))
  87       return false;
  88    pid_t Process = ExecFork();
  89    if (Process == 0)
  90    {
  91       char buf[32];
  92       snprintf(buf, sizeof(buf), "-p%d", PID);
  93       const char *Args[4];
  94       Args[0] = "/usr/bin/ionice";
  95       Args[1] = "-c3";
  96       Args[2] = buf;
  97       Args[3] = 0;
  98       execv(Args[0], (char **)Args);
  99    }
 100    return ExecWait(Process, "ionice");
 101 }
 102
 103 // DPkgPM::pkgDPkgPM - Constructor                                      /*{{{*/
 104 // ---------------------------------------------------------------------
 105 /* */
 106 pkgDPkgPM::pkgDPkgPM(pkgDepCache *Cache)
 107    : pkgPackageManager(Cache), dpkgbuf_pos(0),
 108      term_out(NULL), PackagesDone(0), PackagesTotal(0)
 109 {
 110 }
 111                                                                         /*}}}*/
 112 // DPkgPM::pkgDPkgPM - Destructor                                       /*{{{*/
 113 // ---------------------------------------------------------------------
 114 /* */
 115 pkgDPkgPM::~pkgDPkgPM()
 116 {
 117 }
 118                                                                         /*}}}*/
 119 // DPkgPM::Install - Install a package                                  /*{{{*/
 120 // ---------------------------------------------------------------------
 121 /* Add an install operation to the sequence list */
 122 bool pkgDPkgPM::Install(PkgIterator Pkg,string File)
 123 {
 124    if (File.empty() == true || Pkg.end() == true)
 125       return _error->Error("Internal Error, No file name for %s",Pkg.Name());
 126
 127    List.push_back(Item(Item::Install,Pkg,File));
 128    return true;
 129 }
 130                                                                         /*}}}*/
 131 // DPkgPM::Configure - Configure a package                              /*{{{*/
 132 // ---------------------------------------------------------------------
 133 /* Add a configure operation to the sequence list */
 134 bool pkgDPkgPM::Configure(PkgIterator Pkg)
 135 {
 136    if (Pkg.end() == true)
 137       return false;
 138
 139    List.push_back(Item(Item::Configure, Pkg));
 140
 141    // Use triggers for config calls if we configure "smart"
 142    // as otherwise Pre-Depends will not be satisfied, see #526774
 143    if (_config->FindB("DPkg::TriggersPending", false) == true)
 144       List.push_back(Item(Item::TriggersPending, PkgIterator()));
 145
 146    return true;
 147 }
 148                                                                         /*}}}*/
 149 // DPkgPM::Remove - Remove a package                                    /*{{{*/
 150 // ---------------------------------------------------------------------
 151 /* Add a remove operation to the sequence list */
 152 bool pkgDPkgPM::Remove(PkgIterator Pkg,bool Purge)
 153 {
 154    if (Pkg.end() == true)
 155       return false;
 156
 157    if (Purge == true)
 158       List.push_back(Item(Item::Purge,Pkg));
 159    else
 160       List.push_back(Item(Item::Remove,Pkg));
 161    return true;
 162 }
 163                                                                         /*}}}*/
 164 // DPkgPM::SendV2Pkgs - Send version 2 package info                     /*{{{*/
 165 // ---------------------------------------------------------------------
 166 /* This is part of the helper script communication interface, it sends
 167    very complete information down to the other end of the pipe.*/
 168 bool pkgDPkgPM::SendV2Pkgs(FILE *F)
 169 {
 170    fprintf(F,"VERSION 2\n");
 171
 172    /* Write out all of the configuration directives by walking the
 173       configuration tree */
 174    const Configuration::Item *Top = _config->Tree(0);
 175    for (; Top != 0;)
 176    {
 177       if (Top->Value.empty() == false)
 178       {
 179          fprintf(F,"%s=%s\n",
 180                  QuoteString(Top->FullTag(),"=\"\n").c_str(),
 181                  QuoteString(Top->Value,"\n").c_str());
 182       }
 183
 184       if (Top->Child != 0)
 185       {
 186          Top = Top->Child;
 187          continue;
 188       }
 189
 190       while (Top != 0 && Top->Next == 0)
 191          Top = Top->Parent;
 192       if (Top != 0)
 193          Top = Top->Next;
 194    }
 195    fprintf(F,"\n");
 196
 197    // Write out the package actions in order.
 198    for (vector<Item>::iterator I = List.begin(); I != List.end(); I++)
 199    {
 200       if(I->Pkg.end() == true)
 201          continue;
 202
 203       pkgDepCache::StateCache &S = Cache[I->Pkg];
 204
 205       fprintf(F,"%s ",I->Pkg.Name());
 206       // Current version
 207       if (I->Pkg->CurrentVer == 0)
 208          fprintf(F,"- ");
 209       else
 210          fprintf(F,"%s ",I->Pkg.CurrentVer().VerStr());
 211
 212       // Show the compare operator
 213       // Target version
 214       if (S.InstallVer != 0)
 215       {
 216          int Comp = 2;
 217          if (I->Pkg->CurrentVer != 0)
 218             Comp = S.InstVerIter(Cache).CompareVer(I->Pkg.CurrentVer());
 219          if (Comp < 0)
 220             fprintf(F,"> ");
 221          if (Comp == 0)
 222             fprintf(F,"= ");
 223          if (Comp > 0)
 224             fprintf(F,"< ");
 225          fprintf(F,"%s ",S.InstVerIter(Cache).VerStr());
 226       }
 227       else
 228          fprintf(F,"> - ");
 229
 230       // Show the filename/operation
 231       if (I->Op == Item::Install)
 232       {
 233          // No errors here..
 234          if (I->File[0] != '/')
 235             fprintf(F,"**ERROR**\n");
 236          else
 237             fprintf(F,"%s\n",I->File.c_str());
 238       }
 239       if (I->Op == Item::Configure)
 240          fprintf(F,"**CONFIGURE**\n");
 241       if (I->Op == Item::Remove ||
 242           I->Op == Item::Purge)
 243          fprintf(F,"**REMOVE**\n");
 244
 245       if (ferror(F) != 0)
 246          return false;
 247    }
 248    return true;
 249 }
 250                                                                         /*}}}*/
 251 // DPkgPM::RunScriptsWithPkgs - Run scripts with package names on stdin /*{{{*/
 252 // ---------------------------------------------------------------------
 253 /* This looks for a list of scripts to run from the configuration file
 254    each one is run and is fed on standard input a list of all .deb files
 255    that are due to be installed. */
 256 bool pkgDPkgPM::RunScriptsWithPkgs(const char *Cnf)
 257 {
 258    Configuration::Item const *Opts = _config->Tree(Cnf);
 259    if (Opts == 0 || Opts->Child == 0)
 260       return true;
 261    Opts = Opts->Child;
 262
 263    unsigned int Count = 1;
 264    for (; Opts != 0; Opts = Opts->Next, Count++)
 265    {
 266       if (Opts->Value.empty() == true)
 267          continue;
 268
 269       // Determine the protocol version
 270       string OptSec = Opts->Value;
 271       string::size_type Pos;
 272       if ((Pos = OptSec.find(' ')) == string::npos || Pos == 0)
 273          Pos = OptSec.length();
 274       OptSec = "DPkg::Tools::Options::" + string(Opts->Value.c_str(),Pos);
 275
 276       unsigned int Version = _config->FindI(OptSec+"::Version",1);
 277
 278       // Create the pipes
 279       int Pipes[2];
 280       if (pipe(Pipes) != 0)
 281          return _error->Errno("pipe","Failed to create IPC pipe to subprocess");
 282       SetCloseExec(Pipes[0],true);
 283       SetCloseExec(Pipes[1],true);
 284
 285       // Purified Fork for running the script
 286       pid_t Process = ExecFork();
 287       if (Process == 0)
 288       {
 289          // Setup the FDs
 290          dup2(Pipes[0],STDIN_FILENO);
 291          SetCloseExec(STDOUT_FILENO,false);
 292          SetCloseExec(STDIN_FILENO,false);
 293          SetCloseExec(STDERR_FILENO,false);
 294
 295          const char *Args[4];
 296          Args[0] = "/bin/sh";
 297          Args[1] = "-c";
 298          Args[2] = Opts->Value.c_str();
 299          Args[3] = 0;
 300          execv(Args[0],(char **)Args);
 301          _exit(100);
 302       }
 303       close(Pipes[0]);
 304       FILE *F = fdopen(Pipes[1],"w");
 305       if (F == 0)
 306          return _error->Errno("fdopen","Faild to open new FD");
 307
 308       // Feed it the filenames.
 309       bool Die = false;
 310       if (Version <= 1)
 311       {
 312          for (vector<Item>::iterator I = List.begin(); I != List.end(); I++)
 313          {
 314             // Only deal with packages to be installed from .deb
 315             if (I->Op != Item::Install)
 316                continue;
 317
 318             // No errors here..
 319             if (I->File[0] != '/')
 320                continue;
 321
 322             /* Feed the filename of each package that is pending install
 323                into the pipe. */
 324             fprintf(F,"%s\n",I->File.c_str());
 325             if (ferror(F) != 0)
 326             {
 327                Die = true;
 328                break;
 329             }
 330          }
 331       }
 332       else
 333          Die = !SendV2Pkgs(F);
 334
 335       fclose(F);
 336
 337       // Clean up the sub process
 338       if (ExecWait(Process,Opts->Value.c_str()) == false)
 339          return _error->Error("Failure running script %s",Opts->Value.c_str());
 340    }
 341
 342    return true;
 343 }
 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[5];
 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       status << "pmerror:" << list[1]
 463              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 464              << ":" << list[3]
 465              << endl;
 466       if(OutStatusFd > 0)
 467          write(OutStatusFd, status.str().c_str(), status.str().size());
 468       if (Debug == true)
 469          std::clog << "send: '" << status.str() << "'" << endl;
 470       return;
 471    }
 472    else if(strncmp(action,"conffile",strlen("conffile")) == 0)
 473    {
 474       status << "pmconffile:" << list[1]
 475              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 476              << ":" << list[3]
 477              << endl;
 478       if(OutStatusFd > 0)
 479          write(OutStatusFd, status.str().c_str(), status.str().size());
 480       if (Debug == true)
 481          std::clog << "send: '" << status.str() << "'" << endl;
 482       return;
 483    }
 484
 485    vector<struct DpkgState> const &states = PackageOps[pkg];
 486    const char *next_action = NULL;
 487    if(PackageOpsDone[pkg] < states.size())
 488       next_action = states[PackageOpsDone[pkg]].state;
 489    // check if the package moved to the next dpkg state
 490    if(next_action && (strcmp(action, next_action) == 0))
 491    {
 492       // only read the translation if there is actually a next
 493       // action
 494       const char *translation = _(states[PackageOpsDone[pkg]].str);
 495       char s[200];
 496       snprintf(s, sizeof(s), translation, pkg);
 497
 498       // we moved from one dpkg state to a new one, report that
 499       PackageOpsDone[pkg]++;
 500       PackagesDone++;
 501       // build the status str
 502       status << "pmstatus:" << pkg
 503              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 504              << ":" << s
 505              << endl;
 506       if(OutStatusFd > 0)
 507          write(OutStatusFd, status.str().c_str(), status.str().size());
 508       if (Debug == true)
 509          std::clog << "send: '" << status.str() << "'" << endl;
 510    }
 511    if (Debug == true)
 512       std::clog << "(parsed from dpkg) pkg: " << pkg
 513                 << " action: " << action << endl;
 514 }
 515                                                                         /*}}}*/
 516 // DPkgPM::DoDpkgStatusFd                                               /*{{{*/
 517 // ---------------------------------------------------------------------
 518 /*
 519  */
 520 void pkgDPkgPM::DoDpkgStatusFd(int statusfd, int OutStatusFd)
 521 {
 522    char *p, *q;
 523    int len;
 524
 525    len=read(statusfd, &dpkgbuf[dpkgbuf_pos], sizeof(dpkgbuf)-dpkgbuf_pos);
 526    dpkgbuf_pos += len;
 527    if(len <= 0)
 528       return;
 529
 530    // process line by line if we have a buffer
 531    p = q = dpkgbuf;
 532    while((q=(char*)memchr(p, '\n', dpkgbuf+dpkgbuf_pos-p)) != NULL)
 533    {
 534       *q = 0;
 535       ProcessDpkgStatusLine(OutStatusFd, p);
 536       p=q+1; // continue with next line
 537    }
 538
 539    // now move the unprocessed bits (after the final \n that is now a 0x0)
 540    // to the start and update dpkgbuf_pos
 541    p = (char*)memrchr(dpkgbuf, 0, dpkgbuf_pos);
 542    if(p == NULL)
 543       return;
 544
 545    // we are interessted in the first char *after* 0x0
 546    p++;
 547
 548    // move the unprocessed tail to the start and update pos
 549    memmove(dpkgbuf, p, p-dpkgbuf);
 550    dpkgbuf_pos = dpkgbuf+dpkgbuf_pos-p;
 551 }
 552                                                                         /*}}}*/
 553 // DPkgPM::OpenLog                                                      /*{{{*/
 554 bool pkgDPkgPM::OpenLog()
 555 {
 556    string logdir = _config->FindDir("Dir::Log");
 557    if(not FileExists(logdir))
 558       return _error->Error(_("Directory '%s' missing"), logdir.c_str());
 559    string logfile_name = flCombine(logdir,
 560                                    _config->Find("Dir::Log::Terminal"));
 561    if (!logfile_name.empty())
 562    {
 563       term_out = fopen(logfile_name.c_str(),"a");
 564       if (term_out == NULL)
 565          return _error->WarningE(_("Could not open file '%s'"), logfile_name.c_str());
 566
 567       chmod(logfile_name.c_str(), 0600);
 568       // output current time
 569       char outstr[200];
 570       time_t t = time(NULL);
 571       struct tm *tmp = localtime(&t);
 572       strftime(outstr, sizeof(outstr), "%F  %T", tmp);
 573       fprintf(term_out, "\nLog started: %s\n", outstr);
 574    }
 575    return true;
 576 }
 577                                                                         /*}}}*/
 578 // DPkg::CloseLog                                                       /*{{{*/
 579 bool pkgDPkgPM::CloseLog()
 580 {
 581    if(term_out)
 582    {
 583       char outstr[200];
 584       time_t t = time(NULL);
 585       struct tm *tmp = localtime(&t);
 586       strftime(outstr, sizeof(outstr), "%F  %T", tmp);
 587       fprintf(term_out, "Log ended: ");
 588       fprintf(term_out, "%s", outstr);
 589       fprintf(term_out, "\n");
 590       fclose(term_out);
 591    }
 592    term_out = NULL;
 593    return true;
 594 }
 595                                                                         /*}}}*/
 596 /*{{{*/
 597 // This implements a racy version of pselect for those architectures
 598 // that don't have a working implementation.
 599 // FIXME: Probably can be removed on Lenny+1
 600 static int racy_pselect(int nfds, fd_set *readfds, fd_set *writefds,
 601    fd_set *exceptfds, const struct timespec *timeout,
 602    const sigset_t *sigmask)
 603 {
 604    sigset_t origmask;
 605    struct timeval tv;
 606    int retval;
 607
 608    tv.tv_sec = timeout->tv_sec;
 609    tv.tv_usec = timeout->tv_nsec/1000;
 610
 611    sigprocmask(SIG_SETMASK, sigmask, &origmask);
 612    retval = select(nfds, readfds, writefds, exceptfds, &tv);
 613    sigprocmask(SIG_SETMASK, &origmask, 0);
 614    return retval;
 615 }
 616 /*}}}*/
 617 // DPkgPM::Go - Run the sequence                                        /*{{{*/
 618 // ---------------------------------------------------------------------
 619 /* This globs the operations and calls dpkg
 620  *
 621  * If it is called with "OutStatusFd" set to a valid file descriptor
 622  * apt will report the install progress over this fd. It maps the
 623  * dpkg states a package goes through to human readable (and i10n-able)
 624  * names and calculates a percentage for each step.
 625 */
 626 bool pkgDPkgPM::Go(int OutStatusFd)
 627 {
 628    fd_set rfds;
 629    struct timespec tv;
 630    sigset_t sigmask;
 631    sigset_t original_sigmask;
 632
 633    unsigned int const MaxArgs = _config->FindI("Dpkg::MaxArgs",8*1024);
 634    unsigned int const MaxArgBytes = _config->FindI("Dpkg::MaxArgBytes",32*1024);
 635    bool const NoTriggers = _config->FindB("DPkg::NoTriggers", false);
 636
 637    if (RunScripts("DPkg::Pre-Invoke") == false)
 638       return false;
 639
 640    if (RunScriptsWithPkgs("DPkg::Pre-Install-Pkgs") == false)
 641       return false;
 642
 643    // support subpressing of triggers processing for special
 644    // cases like d-i that runs the triggers handling manually
 645    bool const SmartConf = (_config->Find("PackageManager::Configure", "all") != "all");
 646    bool const TriggersPending = _config->FindB("DPkg::TriggersPending", false);
 647    if (_config->FindB("DPkg::ConfigurePending", SmartConf) == true)
 648       List.push_back(Item(Item::ConfigurePending, PkgIterator()));
 649
 650    // map the dpkg states to the operations that are performed
 651    // (this is sorted in the same way as Item::Ops)
 652    static const struct DpkgState DpkgStatesOpMap[][7] = {
 653       // Install operation
 654       {
 655          {"half-installed", N_("Preparing %s")},
 656          {"unpacked", N_("Unpacking %s") },
 657          {NULL, NULL}
 658       },
 659       // Configure operation
 660       {
 661          {"unpacked",N_("Preparing to configure %s") },
 662          {"half-configured", N_("Configuring %s") },
 663          { "installed", N_("Installed %s")},
 664          {NULL, NULL}
 665       },
 666       // Remove operation
 667       {
 668          {"half-configured", N_("Preparing for removal of %s")},
 669          {"half-installed", N_("Removing %s")},
 670          {"config-files",  N_("Removed %s")},
 671          {NULL, NULL}
 672       },
 673       // Purge operation
 674       {
 675          {"config-files", N_("Preparing to completely remove %s")},
 676          {"not-installed", N_("Completely removed %s")},
 677          {NULL, NULL}
 678       },
 679    };
 680
 681    // init the PackageOps map, go over the list of packages that
 682    // that will be [installed|configured|removed|purged] and add
 683    // them to the PackageOps map (the dpkg states it goes through)
 684    // and the PackageOpsTranslations (human readable strings)
 685    for (vector<Item>::const_iterator I = List.begin(); I != List.end();I++)
 686    {
 687       if((*I).Pkg.end() == true)
 688          continue;
 689
 690       string const name = (*I).Pkg.Name();
 691       PackageOpsDone[name] = 0;
 692       for(int i=0; (DpkgStatesOpMap[(*I).Op][i]).state != NULL;  i++)
 693       {
 694          PackageOps[name].push_back(DpkgStatesOpMap[(*I).Op][i]);
 695          PackagesTotal++;
 696       }
 697    }
 698
 699    stdin_is_dev_null = false;
 700
 701    // create log
 702    OpenLog();
 703
 704    // this loop is runs once per operation
 705    for (vector<Item>::const_iterator I = List.begin(); I != List.end();)
 706    {
 707       // Do all actions with the same Op in one run
 708       vector<Item>::const_iterator J = I;
 709       if (TriggersPending == true)
 710          for (; J != List.end(); J++)
 711          {
 712             if (J->Op == I->Op)
 713                continue;
 714             if (J->Op != Item::TriggersPending)
 715                break;
 716             vector<Item>::const_iterator T = J + 1;
 717             if (T != List.end() && T->Op == I->Op)
 718                continue;
 719             break;
 720          }
 721       else
 722          for (; J != List.end() && J->Op == I->Op; J++)
 723             /* nothing */;
 724
 725       // Generate the argument list
 726       const char *Args[MaxArgs + 50];
 727
 728       // Now check if we are within the MaxArgs limit
 729       //
 730       // this code below is problematic, because it may happen that
 731       // the argument list is split in a way that A depends on B
 732       // and they are in the same "--configure A B" run
 733       // - with the split they may now be configured in different
 734       //   runs
 735       if (J - I > (signed)MaxArgs)
 736          J = I + MaxArgs;
 737
 738       unsigned int n = 0;
 739       unsigned long Size = 0;
 740       string const Tmp = _config->Find("Dir::Bin::dpkg","dpkg");
 741       Args[n++] = Tmp.c_str();
 742       Size += strlen(Args[n-1]);
 743
 744       // Stick in any custom dpkg options
 745       Configuration::Item const *Opts = _config->Tree("DPkg::Options");
 746       if (Opts != 0)
 747       {
 748          Opts = Opts->Child;
 749          for (; Opts != 0; Opts = Opts->Next)
 750          {
 751             if (Opts->Value.empty() == true)
 752                continue;
 753             Args[n++] = Opts->Value.c_str();
 754             Size += Opts->Value.length();
 755          }
 756       }
 757
 758       char status_fd_buf[20];
 759       int fd[2];
 760       pipe(fd);
 761
 762       Args[n++] = "--status-fd";
 763       Size += strlen(Args[n-1]);
 764       snprintf(status_fd_buf,sizeof(status_fd_buf),"%i", fd[1]);
 765       Args[n++] = status_fd_buf;
 766       Size += strlen(Args[n-1]);
 767
 768       switch (I->Op)
 769       {
 770          case Item::Remove:
 771          Args[n++] = "--force-depends";
 772          Size += strlen(Args[n-1]);
 773          Args[n++] = "--force-remove-essential";
 774          Size += strlen(Args[n-1]);
 775          Args[n++] = "--remove";
 776          Size += strlen(Args[n-1]);
 777          break;
 778
 779          case Item::Purge:
 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++] = "--purge";
 785          Size += strlen(Args[n-1]);
 786          break;
 787
 788          case Item::Configure:
 789          Args[n++] = "--configure";
 790          Size += strlen(Args[n-1]);
 791          break;
 792
 793          case Item::ConfigurePending:
 794          Args[n++] = "--configure";
 795          Size += strlen(Args[n-1]);
 796          Args[n++] = "--pending";
 797          Size += strlen(Args[n-1]);
 798          break;
 799
 800          case Item::TriggersPending:
 801          Args[n++] = "--triggers-only";
 802          Size += strlen(Args[n-1]);
 803          Args[n++] = "--pending";
 804          Size += strlen(Args[n-1]);
 805          break;
 806
 807          case Item::Install:
 808          Args[n++] = "--unpack";
 809          Size += strlen(Args[n-1]);
 810          Args[n++] = "--auto-deconfigure";
 811          Size += strlen(Args[n-1]);
 812          break;
 813       }
 814
 815       if (NoTriggers == true && I->Op != Item::TriggersPending &&
 816           I->Op != Item::ConfigurePending)
 817       {
 818          Args[n++] = "--no-triggers";
 819          Size += strlen(Args[n-1]);
 820       }
 821
 822       // Write in the file or package names
 823       if (I->Op == Item::Install)
 824       {
 825          for (;I != J && Size < MaxArgBytes; I++)
 826          {
 827             if (I->File[0] != '/')
 828                return _error->Error("Internal Error, Pathname to install is not absolute '%s'",I->File.c_str());
 829             Args[n++] = I->File.c_str();
 830             Size += strlen(Args[n-1]);
 831          }
 832       }
 833       else
 834       {
 835          for (;I != J && Size < MaxArgBytes; I++)
 836          {
 837             if((*I).Pkg.end() == true)
 838                continue;
 839             Args[n++] = I->Pkg.Name();
 840             Size += strlen(Args[n-1]);
 841          }
 842       }
 843       Args[n] = 0;
 844       J = I;
 845
 846       if (_config->FindB("Debug::pkgDPkgPM",false) == true)
 847       {
 848          for (unsigned int k = 0; k != n; k++)
 849             clog << Args[k] << ' ';
 850          clog << endl;
 851          continue;
 852       }
 853
 854       cout << flush;
 855       clog << flush;
 856       cerr << flush;
 857
 858       /* Mask off sig int/quit. We do this because dpkg also does when
 859          it forks scripts. What happens is that when you hit ctrl-c it sends
 860          it to all processes in the group. Since dpkg ignores the signal
 861          it doesn't die but we do! So we must also ignore it */
 862       sighandler_t old_SIGQUIT = signal(SIGQUIT,SIG_IGN);
 863       sighandler_t old_SIGINT = signal(SIGINT,SIG_IGN);
 864
 865       // ignore SIGHUP as well (debian #463030)
 866       sighandler_t old_SIGHUP = signal(SIGHUP,SIG_IGN);
 867
 868       struct    termios tt;
 869       struct    winsize win;
 870       int       master = -1;
 871       int       slave = -1;
 872
 873       // if tcgetattr does not return zero there was a error
 874       // and we do not do any pty magic
 875       if (tcgetattr(0, &tt) == 0)
 876       {
 877          ioctl(0, TIOCGWINSZ, (char *)&win);
 878          if (openpty(&master, &slave, NULL, &tt, &win) < 0)
 879          {
 880             const char *s = _("Can not write log, openpty() "
 881                               "failed (/dev/pts not mounted?)\n");
 882             fprintf(stderr, "%s",s);
 883             if(term_out)
 884               fprintf(term_out, "%s",s);
 885             master = slave = -1;
 886          }  else {
 887             struct termios rtt;
 888             rtt = tt;
 889             cfmakeraw(&rtt);
 890             rtt.c_lflag &= ~ECHO;
 891             // block SIGTTOU during tcsetattr to prevent a hang if
 892             // the process is a member of the background process group
 893             // http://www.opengroup.org/onlinepubs/000095399/functions/tcsetattr.html
 894             sigemptyset(&sigmask);
 895             sigaddset(&sigmask, SIGTTOU);
 896             sigprocmask(SIG_BLOCK,&sigmask, &original_sigmask);
 897             tcsetattr(0, TCSAFLUSH, &rtt);
 898             sigprocmask(SIG_SETMASK, &original_sigmask, 0);
 899          }
 900       }
 901
 902        // Fork dpkg
 903       pid_t Child;
 904       _config->Set("APT::Keep-Fds::",fd[1]);
 905       // send status information that we are about to fork dpkg
 906       if(OutStatusFd > 0) {
 907          ostringstream status;
 908          status << "pmstatus:dpkg-exec:"
 909                 << (PackagesDone/float(PackagesTotal)*100.0)
 910                 << ":" << _("Running dpkg")
 911                 << endl;
 912          write(OutStatusFd, status.str().c_str(), status.str().size());
 913       }
 914       Child = ExecFork();
 915
 916       // This is the child
 917       if (Child == 0)
 918       {
 919          if(slave >= 0 && master >= 0)
 920          {
 921             setsid();
 922             ioctl(slave, TIOCSCTTY, 0);
 923             close(master);
 924             dup2(slave, 0);
 925             dup2(slave, 1);
 926             dup2(slave, 2);
 927             close(slave);
 928          }
 929          close(fd[0]); // close the read end of the pipe
 930
 931          if (_config->FindDir("DPkg::Chroot-Directory","/") != "/")
 932          {
 933             std::cerr << "Chrooting into "
 934                       << _config->FindDir("DPkg::Chroot-Directory")
 935                       << std::endl;
 936             if (chroot(_config->FindDir("DPkg::Chroot-Directory","/").c_str()) != 0)
 937                _exit(100);
 938          }
 939
 940          if (chdir(_config->FindDir("DPkg::Run-Directory","/").c_str()) != 0)
 941             _exit(100);
 942
 943          if (_config->FindB("DPkg::FlushSTDIN",true) == true && isatty(STDIN_FILENO))
 944          {
 945             int Flags,dummy;
 946             if ((Flags = fcntl(STDIN_FILENO,F_GETFL,dummy)) < 0)
 947                _exit(100);
 948
 949             // Discard everything in stdin before forking dpkg
 950             if (fcntl(STDIN_FILENO,F_SETFL,Flags | O_NONBLOCK) < 0)
 951                _exit(100);
 952
 953             while (read(STDIN_FILENO,&dummy,1) == 1);
 954
 955             if (fcntl(STDIN_FILENO,F_SETFL,Flags & (~(long)O_NONBLOCK)) < 0)
 956                _exit(100);
 957          }
 958
 959          /* No Job Control Stop Env is a magic dpkg var that prevents it
 960             from using sigstop */
 961          putenv((char *)"DPKG_NO_TSTP=yes");
 962          execvp(Args[0],(char **)Args);
 963          cerr << "Could not exec dpkg!" << endl;
 964          _exit(100);
 965       }
 966
 967       // apply ionice
 968       if (_config->FindB("DPkg::UseIoNice", false) == true)
 969          ionice(Child);
 970
 971       // clear the Keep-Fd again
 972       _config->Clear("APT::Keep-Fds",fd[1]);
 973
 974       // Wait for dpkg
 975       int Status = 0;
 976
 977       // we read from dpkg here
 978       int const _dpkgin = fd[0];
 979       close(fd[1]);                        // close the write end of the pipe
 980
 981       if(slave > 0)
 982          close(slave);
 983
 984       // setups fds
 985       sigemptyset(&sigmask);
 986       sigprocmask(SIG_BLOCK,&sigmask,&original_sigmask);
 987
 988       // the result of the waitpid call
 989       int res;
 990       int select_ret;
 991       while ((res=waitpid(Child,&Status, WNOHANG)) != Child) {
 992          if(res < 0) {
 993             // FIXME: move this to a function or something, looks ugly here
 994             // error handling, waitpid returned -1
 995             if (errno == EINTR)
 996                continue;
 997             RunScripts("DPkg::Post-Invoke");
 998
 999             // Restore sig int/quit
1000             signal(SIGQUIT,old_SIGQUIT);
1001             signal(SIGINT,old_SIGINT);
1002             signal(SIGHUP,old_SIGHUP);
1003             return _error->Errno("waitpid","Couldn't wait for subprocess");
1004          }
1005
1006          // wait for input or output here
1007          FD_ZERO(&rfds);
1008          if (!stdin_is_dev_null)
1009             FD_SET(0, &rfds);
1010          FD_SET(_dpkgin, &rfds);
1011          if(master >= 0)
1012             FD_SET(master, &rfds);
1013          tv.tv_sec = 1;
1014          tv.tv_nsec = 0;
1015          select_ret = pselect(max(master, _dpkgin)+1, &rfds, NULL, NULL,
1016                               &tv, &original_sigmask);
1017          if (select_ret < 0 && (errno == EINVAL || errno == ENOSYS))
1018             select_ret = racy_pselect(max(master, _dpkgin)+1, &rfds, NULL,
1019                                       NULL, &tv, &original_sigmask);
1020          if (select_ret == 0)
1021             continue;
1022          else if (select_ret < 0 && errno == EINTR)
1023             continue;
1024          else if (select_ret < 0)
1025          {
1026             perror("select() returned error");
1027             continue;
1028          }
1029
1030          if(master >= 0 && FD_ISSET(master, &rfds))
1031             DoTerminalPty(master);
1032          if(master >= 0 && FD_ISSET(0, &rfds))
1033             DoStdin(master);
1034          if(FD_ISSET(_dpkgin, &rfds))
1035             DoDpkgStatusFd(_dpkgin, OutStatusFd);
1036       }
1037       close(_dpkgin);
1038
1039       // Restore sig int/quit
1040       signal(SIGQUIT,old_SIGQUIT);
1041       signal(SIGINT,old_SIGINT);
1042       signal(SIGHUP,old_SIGHUP);
1043
1044       if(master >= 0)
1045       {
1046          tcsetattr(0, TCSAFLUSH, &tt);
1047          close(master);
1048       }
1049
1050       // Check for an error code.
1051       if (WIFEXITED(Status) == 0 || WEXITSTATUS(Status) != 0)
1052       {
1053          // if it was set to "keep-dpkg-runing" then we won't return
1054          // here but keep the loop going and just report it as a error
1055          // for later
1056          bool const stopOnError = _config->FindB("Dpkg::StopOnError",true);
1057
1058          if(stopOnError)
1059             RunScripts("DPkg::Post-Invoke");
1060
1061          if (WIFSIGNALED(Status) != 0 && WTERMSIG(Status) == SIGSEGV)
1062             _error->Error("Sub-process %s received a segmentation fault.",Args[0]);
1063          else if (WIFEXITED(Status) != 0)
1064             _error->Error("Sub-process %s returned an error code (%u)",Args[0],WEXITSTATUS(Status));
1065          else
1066             _error->Error("Sub-process %s exited unexpectedly",Args[0]);
1067
1068          if(stopOnError)
1069          {
1070             CloseLog();
1071             return false;
1072          }
1073       }
1074    }
1075    CloseLog();
1076
1077    if (RunScripts("DPkg::Post-Invoke") == false)
1078       return false;
1079
1080    Cache.writeStateFile(NULL);
1081    return true;
1082 }
1083                                                                         /*}}}*/
1084 // pkgDpkgPM::Reset - Dump the contents of the command list             /*{{{*/
1085 // ---------------------------------------------------------------------
1086 /* */
1087 void pkgDPkgPM::Reset()
1088 {
1089    List.erase(List.begin(),List.end());
1090 }
1091                                                                         /*}}}*/