apt-pkg/deb/dpkgpm.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: dpkgpm.cc,v 1.28 2004/01/27 02:25:01 mdz Exp $
   4 /* ######################################################################
   5
   6    DPKG Package Manager - Provide an interface to dpkg
   7
   8    ##################################################################### */
   9                                                                         /*}}}*/
  10 // Includes                                                             /*{{{*/
  11 #include <apt-pkg/dpkgpm.h>
  12 #include <apt-pkg/error.h>
  13 #include <apt-pkg/configuration.h>
  14 #include <apt-pkg/depcache.h>
  15 #include <apt-pkg/strutl.h>
  16 #include <apti18n.h>
  17 #include <apt-pkg/fileutl.h>
  18
  19 #include <unistd.h>
  20 #include <stdlib.h>
  21 #include <fcntl.h>
  22 #include <sys/select.h>
  23 #include <sys/types.h>
  24 #include <sys/wait.h>
  25 #include <signal.h>
  26 #include <errno.h>
  27 #include <stdio.h>
  28 #include <string.h>
  29 #include <algorithm>
  30 #include <sstream>
  31 #include <map>
  32
  33 #include <termios.h>
  34 #include <unistd.h>
  35 #include <sys/ioctl.h>
  36 #include <pty.h>
  37
  38 #include <config.h>
  39 #include <apti18n.h>
  40                                                                         /*}}}*/
  41
  42 using namespace std;
  43
  44 namespace
  45 {
  46   // Maps the dpkg "processing" info to human readable names.  Entry 0
  47   // of each array is the key, entry 1 is the value.
  48   const std::pair<const char *, const char *> PackageProcessingOps[] = {
  49     std::make_pair("install",   N_("Installing %s")),
  50     std::make_pair("configure", N_("Configuring %s")),
  51     std::make_pair("remove",    N_("Removing %s")),
  52     std::make_pair("trigproc",  N_("Running post-installation trigger %s"))
  53   };
  54
  55   const std::pair<const char *, const char *> * const PackageProcessingOpsBegin = PackageProcessingOps;
  56   const std::pair<const char *, const char *> * const PackageProcessingOpsEnd   = PackageProcessingOps + sizeof(PackageProcessingOps) / sizeof(PackageProcessingOps[0]);
  57
  58   // Predicate to test whether an entry in the PackageProcessingOps
  59   // array matches a string.
  60   class MatchProcessingOp
  61   {
  62     const char *target;
  63
  64   public:
  65     MatchProcessingOp(const char *the_target)
  66       : target(the_target)
  67     {
  68     }
  69
  70     bool operator()(const std::pair<const char *, const char *> &pair) const
  71     {
  72       return strcmp(pair.first, target) == 0;
  73     }
  74   };
  75 }
  76
  77 /* helper function to ionice the given PID
  78
  79  there is no C header for ionice yet - just the syscall interface
  80  so we use the binary from util-linux
  81 */
  82 static bool
  83 ionice(int PID)
  84 {
  85    if (!FileExists("/usr/bin/ionice"))
  86       return false;
  87    pid_t Process = ExecFork();
  88    if (Process == 0)
  89    {
  90       char buf[32];
  91       snprintf(buf, sizeof(buf), "-p%d", PID);
  92       const char *Args[4];
  93       Args[0] = "/usr/bin/ionice";
  94       Args[1] = "-c3";
  95       Args[2] = buf;
  96       Args[3] = 0;
  97       execv(Args[0], (char **)Args);
  98    }
  99    return ExecWait(Process, "ionice");
 100 }
 101
 102 // DPkgPM::pkgDPkgPM - Constructor                                      /*{{{*/
 103 // ---------------------------------------------------------------------
 104 /* */
 105 pkgDPkgPM::pkgDPkgPM(pkgDepCache *Cache)
 106    : pkgPackageManager(Cache), dpkgbuf_pos(0),
 107      term_out(NULL), PackagesDone(0), PackagesTotal(0)
 108 {
 109 }
 110                                                                         /*}}}*/
 111 // DPkgPM::pkgDPkgPM - Destructor                                       /*{{{*/
 112 // ---------------------------------------------------------------------
 113 /* */
 114 pkgDPkgPM::~pkgDPkgPM()
 115 {
 116 }
 117                                                                         /*}}}*/
 118 // DPkgPM::Install - Install a package                                  /*{{{*/
 119 // ---------------------------------------------------------------------
 120 /* Add an install operation to the sequence list */
 121 bool pkgDPkgPM::Install(PkgIterator Pkg,string File)
 122 {
 123    if (File.empty() == true || Pkg.end() == true)
 124       return _error->Error("Internal Error, No file name for %s",Pkg.Name());
 125
 126    List.push_back(Item(Item::Install,Pkg,File));
 127    return true;
 128 }
 129                                                                         /*}}}*/
 130 // DPkgPM::Configure - Configure a package                              /*{{{*/
 131 // ---------------------------------------------------------------------
 132 /* Add a configure operation to the sequence list */
 133 bool pkgDPkgPM::Configure(PkgIterator Pkg)
 134 {
 135    if (Pkg.end() == true)
 136       return false;
 137
 138    List.push_back(Item(Item::Configure,Pkg));
 139    return true;
 140 }
 141                                                                         /*}}}*/
 142 // DPkgPM::Remove - Remove a package                                    /*{{{*/
 143 // ---------------------------------------------------------------------
 144 /* Add a remove operation to the sequence list */
 145 bool pkgDPkgPM::Remove(PkgIterator Pkg,bool Purge)
 146 {
 147    if (Pkg.end() == true)
 148       return false;
 149
 150    if (Purge == true)
 151       List.push_back(Item(Item::Purge,Pkg));
 152    else
 153       List.push_back(Item(Item::Remove,Pkg));
 154    return true;
 155 }
 156                                                                         /*}}}*/
 157 // DPkgPM::SendV2Pkgs - Send version 2 package info                     /*{{{*/
 158 // ---------------------------------------------------------------------
 159 /* This is part of the helper script communication interface, it sends
 160    very complete information down to the other end of the pipe.*/
 161 bool pkgDPkgPM::SendV2Pkgs(FILE *F)
 162 {
 163    fprintf(F,"VERSION 2\n");
 164
 165    /* Write out all of the configuration directives by walking the
 166       configuration tree */
 167    const Configuration::Item *Top = _config->Tree(0);
 168    for (; Top != 0;)
 169    {
 170       if (Top->Value.empty() == false)
 171       {
 172          fprintf(F,"%s=%s\n",
 173                  QuoteString(Top->FullTag(),"=\"\n").c_str(),
 174                  QuoteString(Top->Value,"\n").c_str());
 175       }
 176
 177       if (Top->Child != 0)
 178       {
 179          Top = Top->Child;
 180          continue;
 181       }
 182
 183       while (Top != 0 && Top->Next == 0)
 184          Top = Top->Parent;
 185       if (Top != 0)
 186          Top = Top->Next;
 187    }
 188    fprintf(F,"\n");
 189
 190    // Write out the package actions in order.
 191    for (vector<Item>::iterator I = List.begin(); I != List.end(); I++)
 192    {
 193       pkgDepCache::StateCache &S = Cache[I->Pkg];
 194
 195       fprintf(F,"%s ",I->Pkg.Name());
 196       // Current version
 197       if (I->Pkg->CurrentVer == 0)
 198          fprintf(F,"- ");
 199       else
 200          fprintf(F,"%s ",I->Pkg.CurrentVer().VerStr());
 201
 202       // Show the compare operator
 203       // Target version
 204       if (S.InstallVer != 0)
 205       {
 206          int Comp = 2;
 207          if (I->Pkg->CurrentVer != 0)
 208             Comp = S.InstVerIter(Cache).CompareVer(I->Pkg.CurrentVer());
 209          if (Comp < 0)
 210             fprintf(F,"> ");
 211          if (Comp == 0)
 212             fprintf(F,"= ");
 213          if (Comp > 0)
 214             fprintf(F,"< ");
 215          fprintf(F,"%s ",S.InstVerIter(Cache).VerStr());
 216       }
 217       else
 218          fprintf(F,"> - ");
 219
 220       // Show the filename/operation
 221       if (I->Op == Item::Install)
 222       {
 223          // No errors here..
 224          if (I->File[0] != '/')
 225             fprintf(F,"**ERROR**\n");
 226          else
 227             fprintf(F,"%s\n",I->File.c_str());
 228       }
 229       if (I->Op == Item::Configure)
 230          fprintf(F,"**CONFIGURE**\n");
 231       if (I->Op == Item::Remove ||
 232           I->Op == Item::Purge)
 233          fprintf(F,"**REMOVE**\n");
 234
 235       if (ferror(F) != 0)
 236          return false;
 237    }
 238    return true;
 239 }
 240                                                                         /*}}}*/
 241 // DPkgPM::RunScriptsWithPkgs - Run scripts with package names on stdin /*{{{*/
 242 // ---------------------------------------------------------------------
 243 /* This looks for a list of scripts to run from the configuration file
 244    each one is run and is fed on standard input a list of all .deb files
 245    that are due to be installed. */
 246 bool pkgDPkgPM::RunScriptsWithPkgs(const char *Cnf)
 247 {
 248    Configuration::Item const *Opts = _config->Tree(Cnf);
 249    if (Opts == 0 || Opts->Child == 0)
 250       return true;
 251    Opts = Opts->Child;
 252
 253    unsigned int Count = 1;
 254    for (; Opts != 0; Opts = Opts->Next, Count++)
 255    {
 256       if (Opts->Value.empty() == true)
 257          continue;
 258
 259       // Determine the protocol version
 260       string OptSec = Opts->Value;
 261       string::size_type Pos;
 262       if ((Pos = OptSec.find(' ')) == string::npos || Pos == 0)
 263          Pos = OptSec.length();
 264       OptSec = "DPkg::Tools::Options::" + string(Opts->Value.c_str(),Pos);
 265
 266       unsigned int Version = _config->FindI(OptSec+"::Version",1);
 267
 268       // Create the pipes
 269       int Pipes[2];
 270       if (pipe(Pipes) != 0)
 271          return _error->Errno("pipe","Failed to create IPC pipe to subprocess");
 272       SetCloseExec(Pipes[0],true);
 273       SetCloseExec(Pipes[1],true);
 274
 275       // Purified Fork for running the script
 276       pid_t Process = ExecFork();
 277       if (Process == 0)
 278       {
 279          // Setup the FDs
 280          dup2(Pipes[0],STDIN_FILENO);
 281          SetCloseExec(STDOUT_FILENO,false);
 282          SetCloseExec(STDIN_FILENO,false);
 283          SetCloseExec(STDERR_FILENO,false);
 284
 285          const char *Args[4];
 286          Args[0] = "/bin/sh";
 287          Args[1] = "-c";
 288          Args[2] = Opts->Value.c_str();
 289          Args[3] = 0;
 290          execv(Args[0],(char **)Args);
 291          _exit(100);
 292       }
 293       close(Pipes[0]);
 294       FILE *F = fdopen(Pipes[1],"w");
 295       if (F == 0)
 296          return _error->Errno("fdopen","Faild to open new FD");
 297
 298       // Feed it the filenames.
 299       bool Die = false;
 300       if (Version <= 1)
 301       {
 302          for (vector<Item>::iterator I = List.begin(); I != List.end(); I++)
 303          {
 304             // Only deal with packages to be installed from .deb
 305             if (I->Op != Item::Install)
 306                continue;
 307
 308             // No errors here..
 309             if (I->File[0] != '/')
 310                continue;
 311
 312             /* Feed the filename of each package that is pending install
 313                into the pipe. */
 314             fprintf(F,"%s\n",I->File.c_str());
 315             if (ferror(F) != 0)
 316             {
 317                Die = true;
 318                break;
 319             }
 320          }
 321       }
 322       else
 323          Die = !SendV2Pkgs(F);
 324
 325       fclose(F);
 326
 327       // Clean up the sub process
 328       if (ExecWait(Process,Opts->Value.c_str()) == false)
 329          return _error->Error("Failure running script %s",Opts->Value.c_str());
 330    }
 331
 332    return true;
 333 }
 334
 335                                                                         /*}}}*/
 336 // DPkgPM::DoStdin - Read stdin and pass to slave pty                   /*{{{*/
 337 // ---------------------------------------------------------------------
 338 /*
 339 */
 340 void pkgDPkgPM::DoStdin(int master)
 341 {
 342    unsigned char input_buf[256] = {0,};
 343    ssize_t len = read(0, input_buf, sizeof(input_buf));
 344    if (len)
 345       write(master, input_buf, len);
 346    else
 347       stdin_is_dev_null = true;
 348 }
 349                                                                         /*}}}*/
 350 // DPkgPM::DoTerminalPty - Read the terminal pty and write log          /*{{{*/
 351 // ---------------------------------------------------------------------
 352 /*
 353  * read the terminal pty and write log
 354  */
 355 void pkgDPkgPM::DoTerminalPty(int master)
 356 {
 357    unsigned char term_buf[1024] = {0,0, };
 358
 359    ssize_t len=read(master, term_buf, sizeof(term_buf));
 360    if(len == -1 && errno == EIO)
 361    {
 362       // this happens when the child is about to exit, we
 363       // give it time to actually exit, otherwise we run
 364       // into a race
 365       usleep(500000);
 366       return;
 367    }
 368    if(len <= 0)
 369       return;
 370    write(1, term_buf, len);
 371    if(term_out)
 372       fwrite(term_buf, len, sizeof(char), term_out);
 373 }
 374                                                                         /*}}}*/
 375 // DPkgPM::ProcessDpkgStatusBuf                                         /*{{{*/
 376 // ---------------------------------------------------------------------
 377 /*
 378  */
 379 void pkgDPkgPM::ProcessDpkgStatusLine(int OutStatusFd, char *line)
 380 {
 381    // the status we output
 382    ostringstream status;
 383
 384    if (_config->FindB("Debug::pkgDPkgProgressReporting",false) == true)
 385       std::clog << "got from dpkg '" << line << "'" << std::endl;
 386
 387
 388    /* dpkg sends strings like this:
 389       'status:   <pkg>:  <pkg  qstate>'
 390       errors look like this:
 391       '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
 392       and conffile-prompt like this
 393       'status: conffile-prompt: conffile : 'current-conffile' 'new-conffile' useredited distedited
 394
 395       Newer versions of dpkg sent also:
 396       'processing: install: pkg'
 397       'processing: configure: pkg'
 398       'processing: remove: pkg'
 399       'processing: trigproc: trigger'
 400
 401    */
 402    char* list[5];
 403    //        dpkg sends multiline error messages sometimes (see
 404    //        #374195 for a example. we should support this by
 405    //        either patching dpkg to not send multiline over the
 406    //        statusfd or by rewriting the code here to deal with
 407    //        it. for now we just ignore it and not crash
 408    TokSplitString(':', line, list, sizeof(list)/sizeof(list[0]));
 409    if( list[0] == NULL || list[1] == NULL || list[2] == NULL)
 410    {
 411       if (_config->FindB("Debug::pkgDPkgProgressReporting",false) == true)
 412          std::clog << "ignoring line: not enough ':'" << std::endl;
 413       return;
 414    }
 415    char *pkg = list[1];
 416    char *action = _strstrip(list[2]);
 417
 418    // 'processing' from dpkg looks like
 419    // 'processing: action: pkg'
 420    if(strncmp(list[0], "processing", strlen("processing")) == 0)
 421    {
 422       char s[200];
 423       char *pkg_or_trigger = _strstrip(list[2]);
 424       action =_strstrip( list[1]);
 425       const std::pair<const char *, const char *> * const iter =
 426         std::find_if(PackageProcessingOpsBegin,
 427                      PackageProcessingOpsEnd,
 428                      MatchProcessingOp(action));
 429       if(iter == PackageProcessingOpsEnd)
 430       {
 431          if (_config->FindB("Debug::pkgDPkgProgressReporting",false) == true)
 432             std::clog << "ignoring unknwon action: " << action << std::endl;
 433          return;
 434       }
 435       snprintf(s, sizeof(s), _(iter->second), pkg_or_trigger);
 436
 437       status << "pmstatus:" << pkg_or_trigger
 438              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 439              << ":" << s
 440              << endl;
 441       if(OutStatusFd > 0)
 442          write(OutStatusFd, status.str().c_str(), status.str().size());
 443       if (_config->FindB("Debug::pkgDPkgProgressReporting",false) == true)
 444          std::clog << "send: '" << status.str() << "'" << endl;
 445       return;
 446    }
 447
 448    if(strncmp(action,"error",strlen("error")) == 0)
 449    {
 450       status << "pmerror:" << list[1]
 451              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 452              << ":" << list[3]
 453              << endl;
 454       if(OutStatusFd > 0)
 455          write(OutStatusFd, status.str().c_str(), status.str().size());
 456       if (_config->FindB("Debug::pkgDPkgProgressReporting",false) == true)
 457          std::clog << "send: '" << status.str() << "'" << endl;
 458       return;
 459    }
 460    if(strncmp(action,"conffile",strlen("conffile")) == 0)
 461    {
 462       status << "pmconffile:" << 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 (_config->FindB("Debug::pkgDPkgProgressReporting",false) == true)
 469          std::clog << "send: '" << status.str() << "'" << endl;
 470       return;
 471    }
 472
 473    vector<struct DpkgState> &states = PackageOps[pkg];
 474    const char *next_action = NULL;
 475    if(PackageOpsDone[pkg] < states.size())
 476       next_action = states[PackageOpsDone[pkg]].state;
 477    // check if the package moved to the next dpkg state
 478    if(next_action && (strcmp(action, next_action) == 0))
 479    {
 480       // only read the translation if there is actually a next
 481       // action
 482       const char *translation = _(states[PackageOpsDone[pkg]].str);
 483       char s[200];
 484       snprintf(s, sizeof(s), translation, pkg);
 485
 486       // we moved from one dpkg state to a new one, report that
 487       PackageOpsDone[pkg]++;
 488       PackagesDone++;
 489       // build the status str
 490       status << "pmstatus:" << pkg
 491              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 492              << ":" << s
 493              << endl;
 494       if(OutStatusFd > 0)
 495          write(OutStatusFd, status.str().c_str(), status.str().size());
 496       if (_config->FindB("Debug::pkgDPkgProgressReporting",false) == true)
 497          std::clog << "send: '" << status.str() << "'" << endl;
 498    }
 499    if (_config->FindB("Debug::pkgDPkgProgressReporting",false) == true)
 500       std::clog << "(parsed from dpkg) pkg: " << pkg
 501                 << " action: " << action << endl;
 502 }
 503
 504 // DPkgPM::DoDpkgStatusFd                                               /*{{{*/
 505 // ---------------------------------------------------------------------
 506 /*
 507  */
 508 void pkgDPkgPM::DoDpkgStatusFd(int statusfd, int OutStatusFd)
 509 {
 510    char *p, *q;
 511    int len;
 512
 513    len=read(statusfd, &dpkgbuf[dpkgbuf_pos], sizeof(dpkgbuf)-dpkgbuf_pos);
 514    dpkgbuf_pos += len;
 515    if(len <= 0)
 516       return;
 517
 518    // process line by line if we have a buffer
 519    p = q = dpkgbuf;
 520    while((q=(char*)memchr(p, '\n', dpkgbuf+dpkgbuf_pos-p)) != NULL)
 521    {
 522       *q = 0;
 523       ProcessDpkgStatusLine(OutStatusFd, p);
 524       p=q+1; // continue with next line
 525    }
 526
 527    // now move the unprocessed bits (after the final \n that is now a 0x0)
 528    // to the start and update dpkgbuf_pos
 529    p = (char*)memrchr(dpkgbuf, 0, dpkgbuf_pos);
 530    if(p == NULL)
 531       return;
 532
 533    // we are interessted in the first char *after* 0x0
 534    p++;
 535
 536    // move the unprocessed tail to the start and update pos
 537    memmove(dpkgbuf, p, p-dpkgbuf);
 538    dpkgbuf_pos = dpkgbuf+dpkgbuf_pos-p;
 539 }
 540                                                                         /*}}}*/
 541
 542 bool pkgDPkgPM::OpenLog()
 543 {
 544    string logdir = _config->FindDir("Dir::Log");
 545    if(not FileExists(logdir))
 546       return _error->Error(_("Directory '%s' missing"), logdir.c_str());
 547    string logfile_name = flCombine(logdir,
 548                                    _config->Find("Dir::Log::Terminal"));
 549    if (!logfile_name.empty())
 550    {
 551       term_out = fopen(logfile_name.c_str(),"a");
 552       chmod(logfile_name.c_str(), 0600);
 553       // output current time
 554       char outstr[200];
 555       time_t t = time(NULL);
 556       struct tm *tmp = localtime(&t);
 557       strftime(outstr, sizeof(outstr), "%F  %T", tmp);
 558       fprintf(term_out, "\nLog started: ");
 559       fprintf(term_out, "%s", outstr);
 560       fprintf(term_out, "\n");
 561    }
 562    return true;
 563 }
 564
 565 bool pkgDPkgPM::CloseLog()
 566 {
 567    if(term_out)
 568    {
 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, "Log ended: ");
 574       fprintf(term_out, "%s", outstr);
 575       fprintf(term_out, "\n");
 576       fclose(term_out);
 577    }
 578    term_out = NULL;
 579    return true;
 580 }
 581
 582 /*{{{*/
 583 // This implements a racy version of pselect for those architectures
 584 // that don't have a working implementation.
 585 // FIXME: Probably can be removed on Lenny+1
 586 static int racy_pselect(int nfds, fd_set *readfds, fd_set *writefds,
 587    fd_set *exceptfds, const struct timespec *timeout,
 588    const sigset_t *sigmask)
 589 {
 590    sigset_t origmask;
 591    struct timeval tv;
 592    int retval;
 593
 594    tv.tv_sec = timeout->tv_sec;
 595    tv.tv_usec = timeout->tv_nsec/1000;
 596
 597    sigprocmask(SIG_SETMASK, sigmask, &origmask);
 598    retval = select(nfds, readfds, writefds, exceptfds, &tv);
 599    sigprocmask(SIG_SETMASK, &origmask, 0);
 600    return retval;
 601 }
 602 /*}}}*/
 603
 604 // DPkgPM::Go - Run the sequence                                        /*{{{*/
 605 // ---------------------------------------------------------------------
 606 /* This globs the operations and calls dpkg
 607  *
 608  * If it is called with "OutStatusFd" set to a valid file descriptor
 609  * apt will report the install progress over this fd. It maps the
 610  * dpkg states a package goes through to human readable (and i10n-able)
 611  * names and calculates a percentage for each step.
 612 */
 613 bool pkgDPkgPM::Go(int OutStatusFd)
 614 {
 615    fd_set rfds;
 616    struct timespec tv;
 617    sigset_t sigmask;
 618    sigset_t original_sigmask;
 619
 620    unsigned int MaxArgs = _config->FindI("Dpkg::MaxArgs",8*1024);
 621    unsigned int MaxArgBytes = _config->FindI("Dpkg::MaxArgBytes",32*1024);
 622    bool NoTriggers = _config->FindB("DPkg::NoTriggers",false);
 623
 624    if (RunScripts("DPkg::Pre-Invoke") == false)
 625       return false;
 626
 627    if (RunScriptsWithPkgs("DPkg::Pre-Install-Pkgs") == false)
 628       return false;
 629
 630    // map the dpkg states to the operations that are performed
 631    // (this is sorted in the same way as Item::Ops)
 632    static const struct DpkgState DpkgStatesOpMap[][7] = {
 633       // Install operation
 634       {
 635          {"half-installed", N_("Preparing %s")},
 636          {"unpacked", N_("Unpacking %s") },
 637          {NULL, NULL}
 638       },
 639       // Configure operation
 640       {
 641          {"unpacked",N_("Preparing to configure %s") },
 642          {"half-configured", N_("Configuring %s") },
 643          { "installed", N_("Installed %s")},
 644          {NULL, NULL}
 645       },
 646       // Remove operation
 647       {
 648          {"half-configured", N_("Preparing for removal of %s")},
 649          {"half-installed", N_("Removing %s")},
 650          {"config-files",  N_("Removed %s")},
 651          {NULL, NULL}
 652       },
 653       // Purge operation
 654       {
 655          {"config-files", N_("Preparing to completely remove %s")},
 656          {"not-installed", N_("Completely removed %s")},
 657          {NULL, NULL}
 658       },
 659    };
 660
 661    // init the PackageOps map, go over the list of packages that
 662    // that will be [installed|configured|removed|purged] and add
 663    // them to the PackageOps map (the dpkg states it goes through)
 664    // and the PackageOpsTranslations (human readable strings)
 665    for (vector<Item>::iterator I = List.begin(); I != List.end();I++)
 666    {
 667       string name = (*I).Pkg.Name();
 668       PackageOpsDone[name] = 0;
 669       for(int i=0; (DpkgStatesOpMap[(*I).Op][i]).state != NULL;  i++)
 670       {
 671          PackageOps[name].push_back(DpkgStatesOpMap[(*I).Op][i]);
 672          PackagesTotal++;
 673       }
 674    }
 675
 676    stdin_is_dev_null = false;
 677
 678    // create log
 679    OpenLog();
 680
 681    // this loop is runs once per operation
 682    for (vector<Item>::iterator I = List.begin(); I != List.end();)
 683    {
 684       vector<Item>::iterator J = I;
 685       for (; J != List.end() && J->Op == I->Op; J++)
 686          /* nothing */;
 687
 688       // Generate the argument list
 689       const char *Args[MaxArgs + 50];
 690
 691       // Now check if we are within the MaxArgs limit
 692       //
 693       // this code below is problematic, because it may happen that
 694       // the argument list is split in a way that A depends on B
 695       // and they are in the same "--configure A B" run
 696       // - with the split they may now be configured in different
 697       //   runs
 698       if (J - I > (signed)MaxArgs)
 699          J = I + MaxArgs;
 700
 701       unsigned int n = 0;
 702       unsigned long Size = 0;
 703       string Tmp = _config->Find("Dir::Bin::dpkg","dpkg");
 704       Args[n++] = Tmp.c_str();
 705       Size += strlen(Args[n-1]);
 706
 707       // Stick in any custom dpkg options
 708       Configuration::Item const *Opts = _config->Tree("DPkg::Options");
 709       if (Opts != 0)
 710       {
 711          Opts = Opts->Child;
 712          for (; Opts != 0; Opts = Opts->Next)
 713          {
 714             if (Opts->Value.empty() == true)
 715                continue;
 716             Args[n++] = Opts->Value.c_str();
 717             Size += Opts->Value.length();
 718          }
 719       }
 720
 721       char status_fd_buf[20];
 722       int fd[2];
 723       pipe(fd);
 724
 725       Args[n++] = "--status-fd";
 726       Size += strlen(Args[n-1]);
 727       snprintf(status_fd_buf,sizeof(status_fd_buf),"%i", fd[1]);
 728       Args[n++] = status_fd_buf;
 729       Size += strlen(Args[n-1]);
 730
 731       switch (I->Op)
 732       {
 733          case Item::Remove:
 734          Args[n++] = "--force-depends";
 735          Size += strlen(Args[n-1]);
 736          Args[n++] = "--force-remove-essential";
 737          Size += strlen(Args[n-1]);
 738          Args[n++] = "--remove";
 739          Size += strlen(Args[n-1]);
 740          break;
 741
 742          case Item::Purge:
 743          Args[n++] = "--force-depends";
 744          Size += strlen(Args[n-1]);
 745          Args[n++] = "--force-remove-essential";
 746          Size += strlen(Args[n-1]);
 747          Args[n++] = "--purge";
 748          Size += strlen(Args[n-1]);
 749          break;
 750
 751          case Item::Configure:
 752          Args[n++] = "--configure";
 753          if (NoTriggers)
 754             Args[n++] = "--no-triggers";
 755          Size += strlen(Args[n-1]);
 756          break;
 757
 758          case Item::Install:
 759          Args[n++] = "--unpack";
 760          Size += strlen(Args[n-1]);
 761          Args[n++] = "--auto-deconfigure";
 762          Size += strlen(Args[n-1]);
 763          break;
 764       }
 765
 766       // Write in the file or package names
 767       if (I->Op == Item::Install)
 768       {
 769          for (;I != J && Size < MaxArgBytes; I++)
 770          {
 771             if (I->File[0] != '/')
 772                return _error->Error("Internal Error, Pathname to install is not absolute '%s'",I->File.c_str());
 773             Args[n++] = I->File.c_str();
 774             Size += strlen(Args[n-1]);
 775          }
 776       }
 777       else
 778       {
 779          for (;I != J && Size < MaxArgBytes; I++)
 780          {
 781             Args[n++] = I->Pkg.Name();
 782             Size += strlen(Args[n-1]);
 783          }
 784       }
 785       Args[n] = 0;
 786       J = I;
 787
 788       if (_config->FindB("Debug::pkgDPkgPM",false) == true)
 789       {
 790          for (unsigned int k = 0; k != n; k++)
 791             clog << Args[k] << ' ';
 792          clog << endl;
 793          continue;
 794       }
 795
 796       cout << flush;
 797       clog << flush;
 798       cerr << flush;
 799
 800       /* Mask off sig int/quit. We do this because dpkg also does when
 801          it forks scripts. What happens is that when you hit ctrl-c it sends
 802          it to all processes in the group. Since dpkg ignores the signal
 803          it doesn't die but we do! So we must also ignore it */
 804       sighandler_t old_SIGQUIT = signal(SIGQUIT,SIG_IGN);
 805       sighandler_t old_SIGINT = signal(SIGINT,SIG_IGN);
 806
 807       // ignore SIGHUP as well (debian #463030)
 808       sighandler_t old_SIGHUP = signal(SIGHUP,SIG_IGN);
 809
 810       struct    termios tt;
 811       struct    winsize win;
 812       int       master = -1;
 813       int       slave = -1;
 814
 815       // if tcgetattr does not return zero there was a error
 816       // and we do not do any pty magic
 817       if (tcgetattr(0, &tt) == 0)
 818       {
 819          ioctl(0, TIOCGWINSZ, (char *)&win);
 820          if (openpty(&master, &slave, NULL, &tt, &win) < 0)
 821          {
 822             const char *s = _("Can not write log, openpty() "
 823                               "failed (/dev/pts not mounted?)\n");
 824             fprintf(stderr, "%s",s);
 825             fprintf(term_out, "%s",s);
 826             master = slave = -1;
 827          }  else {
 828             struct termios rtt;
 829             rtt = tt;
 830             cfmakeraw(&rtt);
 831             rtt.c_lflag &= ~ECHO;
 832             // block SIGTTOU during tcsetattr to prevent a hang if
 833             // the process is a member of the background process group
 834             // http://www.opengroup.org/onlinepubs/000095399/functions/tcsetattr.html
 835             sigemptyset(&sigmask);
 836             sigaddset(&sigmask, SIGTTOU);
 837             sigprocmask(SIG_BLOCK,&sigmask, &original_sigmask);
 838             tcsetattr(0, TCSAFLUSH, &rtt);
 839             sigprocmask(SIG_SETMASK, &original_sigmask, 0);
 840          }
 841       }
 842
 843        // Fork dpkg
 844       pid_t Child;
 845       _config->Set("APT::Keep-Fds::",fd[1]);
 846       // send status information that we are about to fork dpkg
 847       if(OutStatusFd > 0) {
 848          ostringstream status;
 849          status << "pmstatus:dpkg-exec:"
 850                 << (PackagesDone/float(PackagesTotal)*100.0)
 851                 << ":" << _("Running dpkg")
 852                 << endl;
 853          write(OutStatusFd, status.str().c_str(), status.str().size());
 854       }
 855       Child = ExecFork();
 856
 857       // This is the child
 858       if (Child == 0)
 859       {
 860          if(slave >= 0 && master >= 0)
 861          {
 862             setsid();
 863             ioctl(slave, TIOCSCTTY, 0);
 864             close(master);
 865             dup2(slave, 0);
 866             dup2(slave, 1);
 867             dup2(slave, 2);
 868             close(slave);
 869          }
 870          close(fd[0]); // close the read end of the pipe
 871
 872          if (_config->FindDir("DPkg::Chroot-Directory","/") != "/")
 873          {
 874             std::cerr << "Chrooting into "
 875                       << _config->FindDir("DPkg::Chroot-Directory")
 876                       << std::endl;
 877             if (chroot(_config->FindDir("DPkg::Chroot-Directory","/").c_str()) != 0)
 878                _exit(100);
 879          }
 880
 881          if (chdir(_config->FindDir("DPkg::Run-Directory","/").c_str()) != 0)
 882             _exit(100);
 883
 884          if (_config->FindB("DPkg::FlushSTDIN",true) == true && isatty(STDIN_FILENO))
 885          {
 886             int Flags,dummy;
 887             if ((Flags = fcntl(STDIN_FILENO,F_GETFL,dummy)) < 0)
 888                _exit(100);
 889
 890             // Discard everything in stdin before forking dpkg
 891             if (fcntl(STDIN_FILENO,F_SETFL,Flags | O_NONBLOCK) < 0)
 892                _exit(100);
 893
 894             while (read(STDIN_FILENO,&dummy,1) == 1);
 895
 896             if (fcntl(STDIN_FILENO,F_SETFL,Flags & (~(long)O_NONBLOCK)) < 0)
 897                _exit(100);
 898          }
 899
 900          /* No Job Control Stop Env is a magic dpkg var that prevents it
 901             from using sigstop */
 902          putenv((char *)"DPKG_NO_TSTP=yes");
 903          execvp(Args[0],(char **)Args);
 904          cerr << "Could not exec dpkg!" << endl;
 905          _exit(100);
 906       }
 907
 908       // apply ionice
 909       if (_config->FindB("DPkg::UseIoNice", false) == true)
 910          ionice(Child);
 911
 912       // clear the Keep-Fd again
 913       _config->Clear("APT::Keep-Fds",fd[1]);
 914
 915       // Wait for dpkg
 916       int Status = 0;
 917
 918       // we read from dpkg here
 919       int _dpkgin = fd[0];
 920       close(fd[1]);                        // close the write end of the pipe
 921
 922       // the result of the waitpid call
 923       int res;
 924       if(slave > 0)
 925          close(slave);
 926
 927       // setups fds
 928       sigemptyset(&sigmask);
 929       sigprocmask(SIG_BLOCK,&sigmask,&original_sigmask);
 930
 931       int select_ret;
 932       while ((res=waitpid(Child,&Status, WNOHANG)) != Child) {
 933          if(res < 0) {
 934             // FIXME: move this to a function or something, looks ugly here
 935             // error handling, waitpid returned -1
 936             if (errno == EINTR)
 937                continue;
 938             RunScripts("DPkg::Post-Invoke");
 939
 940             // Restore sig int/quit
 941             signal(SIGQUIT,old_SIGQUIT);
 942             signal(SIGINT,old_SIGINT);
 943             signal(SIGHUP,old_SIGHUP);
 944             return _error->Errno("waitpid","Couldn't wait for subprocess");
 945          }
 946
 947          // wait for input or output here
 948          FD_ZERO(&rfds);
 949          if (!stdin_is_dev_null)
 950             FD_SET(0, &rfds);
 951          FD_SET(_dpkgin, &rfds);
 952          if(master >= 0)
 953             FD_SET(master, &rfds);
 954          tv.tv_sec = 1;
 955          tv.tv_nsec = 0;
 956          select_ret = pselect(max(master, _dpkgin)+1, &rfds, NULL, NULL,
 957                               &tv, &original_sigmask);
 958          if (select_ret < 0 && (errno == EINVAL || errno == ENOSYS))
 959             select_ret = racy_pselect(max(master, _dpkgin)+1, &rfds, NULL,
 960                                       NULL, &tv, &original_sigmask);
 961          if (select_ret == 0)
 962             continue;
 963          else if (select_ret < 0 && errno == EINTR)
 964             continue;
 965          else if (select_ret < 0)
 966          {
 967             perror("select() returned error");
 968             continue;
 969          }
 970
 971          if(master >= 0 && FD_ISSET(master, &rfds))
 972             DoTerminalPty(master);
 973          if(master >= 0 && FD_ISSET(0, &rfds))
 974             DoStdin(master);
 975          if(FD_ISSET(_dpkgin, &rfds))
 976             DoDpkgStatusFd(_dpkgin, OutStatusFd);
 977       }
 978       close(_dpkgin);
 979
 980       // Restore sig int/quit
 981       signal(SIGQUIT,old_SIGQUIT);
 982       signal(SIGINT,old_SIGINT);
 983       signal(SIGHUP,old_SIGHUP);
 984
 985       if(master >= 0)
 986       {
 987          tcsetattr(0, TCSAFLUSH, &tt);
 988          close(master);
 989       }
 990
 991       // Check for an error code.
 992       if (WIFEXITED(Status) == 0 || WEXITSTATUS(Status) != 0)
 993       {
 994          // if it was set to "keep-dpkg-runing" then we won't return
 995          // here but keep the loop going and just report it as a error
 996          // for later
 997          bool stopOnError = _config->FindB("Dpkg::StopOnError",true);
 998
 999          if(stopOnError)
1000             RunScripts("DPkg::Post-Invoke");
1001
1002          if (WIFSIGNALED(Status) != 0 && WTERMSIG(Status) == SIGSEGV)
1003             _error->Error("Sub-process %s received a segmentation fault.",Args[0]);
1004          else if (WIFEXITED(Status) != 0)
1005             _error->Error("Sub-process %s returned an error code (%u)",Args[0],WEXITSTATUS(Status));
1006          else
1007             _error->Error("Sub-process %s exited unexpectedly",Args[0]);
1008
1009          if(stopOnError)
1010          {
1011             CloseLog();
1012             return false;
1013          }
1014       }
1015    }
1016    CloseLog();
1017
1018    if (RunScripts("DPkg::Post-Invoke") == false)
1019       return false;
1020
1021    Cache.writeStateFile(NULL);
1022    return true;
1023 }
1024                                                                         /*}}}*/
1025 // pkgDpkgPM::Reset - Dump the contents of the command list             /*{{{*/
1026 // ---------------------------------------------------------------------
1027 /* */
1028 void pkgDPkgPM::Reset()
1029 {
1030    List.erase(List.begin(),List.end());
1031 }
1032                                                                         /*}}}*/