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    bool const Debug = _config->FindB("Debug::pkgDPkgProgressReporting",false);
 382    // the status we output
 383    ostringstream status;
 384
 385    if (Debug == true)
 386       std::clog << "got from dpkg '" << line << "'" << std::endl;
 387
 388
 389    /* dpkg sends strings like this:
 390       'status:   <pkg>:  <pkg  qstate>'
 391       errors look like this:
 392       '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
 393       and conffile-prompt like this
 394       'status: conffile-prompt: conffile : 'current-conffile' 'new-conffile' useredited distedited
 395
 396       Newer versions of dpkg sent also:
 397       'processing: install: pkg'
 398       'processing: configure: pkg'
 399       'processing: remove: pkg'
 400       'processing: purge: pkg' - but for apt is it a ignored "unknown" action
 401       'processing: trigproc: trigger'
 402
 403    */
 404    char* list[5];
 405    //        dpkg sends multiline error messages sometimes (see
 406    //        #374195 for a example. we should support this by
 407    //        either patching dpkg to not send multiline over the
 408    //        statusfd or by rewriting the code here to deal with
 409    //        it. for now we just ignore it and not crash
 410    TokSplitString(':', line, list, sizeof(list)/sizeof(list[0]));
 411    if( list[0] == NULL || list[1] == NULL || list[2] == NULL)
 412    {
 413       if (Debug == true)
 414          std::clog << "ignoring line: not enough ':'" << std::endl;
 415       return;
 416    }
 417    const char* const pkg = list[1];
 418    const char* action = _strstrip(list[2]);
 419
 420    // 'processing' from dpkg looks like
 421    // 'processing: action: pkg'
 422    if(strncmp(list[0], "processing", strlen("processing")) == 0)
 423    {
 424       char s[200];
 425       const char* const pkg_or_trigger = _strstrip(list[2]);
 426       action = _strstrip( list[1]);
 427       const std::pair<const char *, const char *> * const iter =
 428         std::find_if(PackageProcessingOpsBegin,
 429                      PackageProcessingOpsEnd,
 430                      MatchProcessingOp(action));
 431       if(iter == PackageProcessingOpsEnd)
 432       {
 433          if (Debug == true)
 434             std::clog << "ignoring unknown action: " << action << std::endl;
 435          return;
 436       }
 437       snprintf(s, sizeof(s), _(iter->second), pkg_or_trigger);
 438
 439       status << "pmstatus:" << pkg_or_trigger
 440              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 441              << ":" << s
 442              << endl;
 443       if(OutStatusFd > 0)
 444          write(OutStatusFd, status.str().c_str(), status.str().size());
 445       if (Debug == true)
 446          std::clog << "send: '" << status.str() << "'" << endl;
 447       return;
 448    }
 449
 450    if(strncmp(action,"error",strlen("error")) == 0)
 451    {
 452       status << "pmerror:" << list[1]
 453              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 454              << ":" << list[3]
 455              << endl;
 456       if(OutStatusFd > 0)
 457          write(OutStatusFd, status.str().c_str(), status.str().size());
 458       if (Debug == true)
 459          std::clog << "send: '" << status.str() << "'" << endl;
 460       return;
 461    }
 462    else if(strncmp(action,"conffile",strlen("conffile")) == 0)
 463    {
 464       status << "pmconffile:" << list[1]
 465              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 466              << ":" << list[3]
 467              << endl;
 468       if(OutStatusFd > 0)
 469          write(OutStatusFd, status.str().c_str(), status.str().size());
 470       if (Debug == true)
 471          std::clog << "send: '" << status.str() << "'" << endl;
 472       return;
 473    }
 474
 475    vector<struct DpkgState> const &states = PackageOps[pkg];
 476    const char *next_action = NULL;
 477    if(PackageOpsDone[pkg] < states.size())
 478       next_action = states[PackageOpsDone[pkg]].state;
 479    // check if the package moved to the next dpkg state
 480    if(next_action && (strcmp(action, next_action) == 0))
 481    {
 482       // only read the translation if there is actually a next
 483       // action
 484       const char *translation = _(states[PackageOpsDone[pkg]].str);
 485       char s[200];
 486       snprintf(s, sizeof(s), translation, pkg);
 487
 488       // we moved from one dpkg state to a new one, report that
 489       PackageOpsDone[pkg]++;
 490       PackagesDone++;
 491       // build the status str
 492       status << "pmstatus:" << pkg
 493              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 494              << ":" << s
 495              << endl;
 496       if(OutStatusFd > 0)
 497          write(OutStatusFd, status.str().c_str(), status.str().size());
 498       if (Debug == true)
 499          std::clog << "send: '" << status.str() << "'" << endl;
 500    }
 501    if (Debug == true)
 502       std::clog << "(parsed from dpkg) pkg: " << pkg
 503                 << " action: " << action << endl;
 504 }
 505                                                                         /*}}}*/
 506 // DPkgPM::DoDpkgStatusFd                                               /*{{{*/
 507 // ---------------------------------------------------------------------
 508 /*
 509  */
 510 void pkgDPkgPM::DoDpkgStatusFd(int statusfd, int OutStatusFd)
 511 {
 512    char *p, *q;
 513    int len;
 514
 515    len=read(statusfd, &dpkgbuf[dpkgbuf_pos], sizeof(dpkgbuf)-dpkgbuf_pos);
 516    dpkgbuf_pos += len;
 517    if(len <= 0)
 518       return;
 519
 520    // process line by line if we have a buffer
 521    p = q = dpkgbuf;
 522    while((q=(char*)memchr(p, '\n', dpkgbuf+dpkgbuf_pos-p)) != NULL)
 523    {
 524       *q = 0;
 525       ProcessDpkgStatusLine(OutStatusFd, p);
 526       p=q+1; // continue with next line
 527    }
 528
 529    // now move the unprocessed bits (after the final \n that is now a 0x0)
 530    // to the start and update dpkgbuf_pos
 531    p = (char*)memrchr(dpkgbuf, 0, dpkgbuf_pos);
 532    if(p == NULL)
 533       return;
 534
 535    // we are interessted in the first char *after* 0x0
 536    p++;
 537
 538    // move the unprocessed tail to the start and update pos
 539    memmove(dpkgbuf, p, p-dpkgbuf);
 540    dpkgbuf_pos = dpkgbuf+dpkgbuf_pos-p;
 541 }
 542                                                                         /*}}}*/
 543 // DPkgPM::OpenLog                                                      /*{{{*/
 544 bool pkgDPkgPM::OpenLog()
 545 {
 546    string logdir = _config->FindDir("Dir::Log");
 547    if(not FileExists(logdir))
 548       return _error->Error(_("Directory '%s' missing"), logdir.c_str());
 549    string logfile_name = flCombine(logdir,
 550                                    _config->Find("Dir::Log::Terminal"));
 551    if (!logfile_name.empty())
 552    {
 553       term_out = fopen(logfile_name.c_str(),"a");
 554       chmod(logfile_name.c_str(), 0600);
 555       // output current time
 556       char outstr[200];
 557       time_t t = time(NULL);
 558       struct tm *tmp = localtime(&t);
 559       strftime(outstr, sizeof(outstr), "%F  %T", tmp);
 560       fprintf(term_out, "\nLog started: ");
 561       fprintf(term_out, "%s", outstr);
 562       fprintf(term_out, "\n");
 563    }
 564    return true;
 565 }
 566                                                                         /*}}}*/
 567 // DPkg::CloseLog                                                       /*{{{*/
 568 bool pkgDPkgPM::CloseLog()
 569 {
 570    if(term_out)
 571    {
 572       char outstr[200];
 573       time_t t = time(NULL);
 574       struct tm *tmp = localtime(&t);
 575       strftime(outstr, sizeof(outstr), "%F  %T", tmp);
 576       fprintf(term_out, "Log ended: ");
 577       fprintf(term_out, "%s", outstr);
 578       fprintf(term_out, "\n");
 579       fclose(term_out);
 580    }
 581    term_out = NULL;
 582    return true;
 583 }
 584                                                                         /*}}}*/
 585 /*{{{*/
 586 // This implements a racy version of pselect for those architectures
 587 // that don't have a working implementation.
 588 // FIXME: Probably can be removed on Lenny+1
 589 static int racy_pselect(int nfds, fd_set *readfds, fd_set *writefds,
 590    fd_set *exceptfds, const struct timespec *timeout,
 591    const sigset_t *sigmask)
 592 {
 593    sigset_t origmask;
 594    struct timeval tv;
 595    int retval;
 596
 597    tv.tv_sec = timeout->tv_sec;
 598    tv.tv_usec = timeout->tv_nsec/1000;
 599
 600    sigprocmask(SIG_SETMASK, sigmask, &origmask);
 601    retval = select(nfds, readfds, writefds, exceptfds, &tv);
 602    sigprocmask(SIG_SETMASK, &origmask, 0);
 603    return retval;
 604 }
 605 /*}}}*/
 606 // DPkgPM::Go - Run the sequence                                        /*{{{*/
 607 // ---------------------------------------------------------------------
 608 /* This globs the operations and calls dpkg
 609  *
 610  * If it is called with "OutStatusFd" set to a valid file descriptor
 611  * apt will report the install progress over this fd. It maps the
 612  * dpkg states a package goes through to human readable (and i10n-able)
 613  * names and calculates a percentage for each step.
 614 */
 615 bool pkgDPkgPM::Go(int OutStatusFd)
 616 {
 617    fd_set rfds;
 618    struct timespec tv;
 619    sigset_t sigmask;
 620    sigset_t original_sigmask;
 621
 622    unsigned int const MaxArgs = _config->FindI("Dpkg::MaxArgs",8*1024);
 623    unsigned int const MaxArgBytes = _config->FindI("Dpkg::MaxArgBytes",32*1024);
 624    bool const NoTriggers = _config->FindB("DPkg::NoTriggers",false);
 625
 626    if (RunScripts("DPkg::Pre-Invoke") == false)
 627       return false;
 628
 629    if (RunScriptsWithPkgs("DPkg::Pre-Install-Pkgs") == false)
 630       return false;
 631
 632    // map the dpkg states to the operations that are performed
 633    // (this is sorted in the same way as Item::Ops)
 634    static const struct DpkgState DpkgStatesOpMap[][7] = {
 635       // Install operation
 636       {
 637          {"half-installed", N_("Preparing %s")},
 638          {"unpacked", N_("Unpacking %s") },
 639          {NULL, NULL}
 640       },
 641       // Configure operation
 642       {
 643          {"unpacked",N_("Preparing to configure %s") },
 644          {"half-configured", N_("Configuring %s") },
 645          { "installed", N_("Installed %s")},
 646          {NULL, NULL}
 647       },
 648       // Remove operation
 649       {
 650          {"half-configured", N_("Preparing for removal of %s")},
 651          {"half-installed", N_("Removing %s")},
 652          {"config-files",  N_("Removed %s")},
 653          {NULL, NULL}
 654       },
 655       // Purge operation
 656       {
 657          {"config-files", N_("Preparing to completely remove %s")},
 658          {"not-installed", N_("Completely removed %s")},
 659          {NULL, NULL}
 660       },
 661    };
 662
 663    // init the PackageOps map, go over the list of packages that
 664    // that will be [installed|configured|removed|purged] and add
 665    // them to the PackageOps map (the dpkg states it goes through)
 666    // and the PackageOpsTranslations (human readable strings)
 667    for (vector<Item>::const_iterator I = List.begin(); I != List.end();I++)
 668    {
 669       string const name = (*I).Pkg.Name();
 670       PackageOpsDone[name] = 0;
 671       for(int i=0; (DpkgStatesOpMap[(*I).Op][i]).state != NULL;  i++)
 672       {
 673          PackageOps[name].push_back(DpkgStatesOpMap[(*I).Op][i]);
 674          PackagesTotal++;
 675       }
 676    }
 677
 678    stdin_is_dev_null = false;
 679
 680    // create log
 681    OpenLog();
 682
 683    // this loop is runs once per operation
 684    for (vector<Item>::const_iterator I = List.begin(); I != List.end();)
 685    {
 686       vector<Item>::const_iterator J = I;
 687       for (; J != List.end() && J->Op == I->Op; J++)
 688          /* nothing */;
 689
 690       // Generate the argument list
 691       const char *Args[MaxArgs + 50];
 692
 693       // Now check if we are within the MaxArgs limit
 694       //
 695       // this code below is problematic, because it may happen that
 696       // the argument list is split in a way that A depends on B
 697       // and they are in the same "--configure A B" run
 698       // - with the split they may now be configured in different
 699       //   runs
 700       if (J - I > (signed)MaxArgs)
 701          J = I + MaxArgs;
 702
 703       unsigned int n = 0;
 704       unsigned long Size = 0;
 705       string const Tmp = _config->Find("Dir::Bin::dpkg","dpkg");
 706       Args[n++] = Tmp.c_str();
 707       Size += strlen(Args[n-1]);
 708
 709       // Stick in any custom dpkg options
 710       Configuration::Item const *Opts = _config->Tree("DPkg::Options");
 711       if (Opts != 0)
 712       {
 713          Opts = Opts->Child;
 714          for (; Opts != 0; Opts = Opts->Next)
 715          {
 716             if (Opts->Value.empty() == true)
 717                continue;
 718             Args[n++] = Opts->Value.c_str();
 719             Size += Opts->Value.length();
 720          }
 721       }
 722
 723       char status_fd_buf[20];
 724       int fd[2];
 725       pipe(fd);
 726
 727       Args[n++] = "--status-fd";
 728       Size += strlen(Args[n-1]);
 729       snprintf(status_fd_buf,sizeof(status_fd_buf),"%i", fd[1]);
 730       Args[n++] = status_fd_buf;
 731       Size += strlen(Args[n-1]);
 732
 733       switch (I->Op)
 734       {
 735          case Item::Remove:
 736          Args[n++] = "--force-depends";
 737          Size += strlen(Args[n-1]);
 738          Args[n++] = "--force-remove-essential";
 739          Size += strlen(Args[n-1]);
 740          Args[n++] = "--remove";
 741          Size += strlen(Args[n-1]);
 742          break;
 743
 744          case Item::Purge:
 745          Args[n++] = "--force-depends";
 746          Size += strlen(Args[n-1]);
 747          Args[n++] = "--force-remove-essential";
 748          Size += strlen(Args[n-1]);
 749          Args[n++] = "--purge";
 750          Size += strlen(Args[n-1]);
 751          break;
 752
 753          case Item::Configure:
 754          Args[n++] = "--configure";
 755          if (NoTriggers == true)
 756             Args[n++] = "--no-triggers";
 757          Size += strlen(Args[n-1]);
 758          break;
 759
 760          case Item::Install:
 761          Args[n++] = "--unpack";
 762          Size += strlen(Args[n-1]);
 763          Args[n++] = "--auto-deconfigure";
 764          Size += strlen(Args[n-1]);
 765          break;
 766       }
 767
 768       // Write in the file or package names
 769       if (I->Op == Item::Install)
 770       {
 771          for (;I != J && Size < MaxArgBytes; I++)
 772          {
 773             if (I->File[0] != '/')
 774                return _error->Error("Internal Error, Pathname to install is not absolute '%s'",I->File.c_str());
 775             Args[n++] = I->File.c_str();
 776             Size += strlen(Args[n-1]);
 777          }
 778       }
 779       else
 780       {
 781          for (;I != J && Size < MaxArgBytes; I++)
 782          {
 783             Args[n++] = I->Pkg.Name();
 784             Size += strlen(Args[n-1]);
 785          }
 786       }
 787       Args[n] = 0;
 788       J = I;
 789
 790       if (_config->FindB("Debug::pkgDPkgPM",false) == true)
 791       {
 792          for (unsigned int k = 0; k != n; k++)
 793             clog << Args[k] << ' ';
 794          clog << endl;
 795          continue;
 796       }
 797
 798       cout << flush;
 799       clog << flush;
 800       cerr << flush;
 801
 802       /* Mask off sig int/quit. We do this because dpkg also does when
 803          it forks scripts. What happens is that when you hit ctrl-c it sends
 804          it to all processes in the group. Since dpkg ignores the signal
 805          it doesn't die but we do! So we must also ignore it */
 806       sighandler_t old_SIGQUIT = signal(SIGQUIT,SIG_IGN);
 807       sighandler_t old_SIGINT = signal(SIGINT,SIG_IGN);
 808
 809       // ignore SIGHUP as well (debian #463030)
 810       sighandler_t old_SIGHUP = signal(SIGHUP,SIG_IGN);
 811
 812       struct    termios tt;
 813       struct    winsize win;
 814       int       master;
 815       int       slave;
 816
 817       // FIXME: setup sensible signal handling (*ick*)
 818       tcgetattr(0, &tt);
 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        // Fork dpkg
 843       pid_t Child;
 844       _config->Set("APT::Keep-Fds::",fd[1]);
 845       // send status information that we are about to fork dpkg
 846       if(OutStatusFd > 0) {
 847          ostringstream status;
 848          status << "pmstatus:dpkg-exec:"
 849                 << (PackagesDone/float(PackagesTotal)*100.0)
 850                 << ":" << _("Running dpkg")
 851                 << endl;
 852          write(OutStatusFd, status.str().c_str(), status.str().size());
 853       }
 854       Child = ExecFork();
 855
 856       // This is the child
 857       if (Child == 0)
 858       {
 859          if(slave >= 0 && master >= 0)
 860          {
 861             setsid();
 862             ioctl(slave, TIOCSCTTY, 0);
 863             close(master);
 864             dup2(slave, 0);
 865             dup2(slave, 1);
 866             dup2(slave, 2);
 867             close(slave);
 868          }
 869          close(fd[0]); // close the read end of the pipe
 870
 871          if (_config->FindDir("DPkg::Chroot-Directory","/") != "/")
 872          {
 873             std::cerr << "Chrooting into "
 874                       << _config->FindDir("DPkg::Chroot-Directory")
 875                       << std::endl;
 876             if (chroot(_config->FindDir("DPkg::Chroot-Directory","/").c_str()) != 0)
 877                _exit(100);
 878          }
 879
 880          if (chdir(_config->FindDir("DPkg::Run-Directory","/").c_str()) != 0)
 881             _exit(100);
 882
 883          if (_config->FindB("DPkg::FlushSTDIN",true) == true && isatty(STDIN_FILENO))
 884          {
 885             int Flags,dummy;
 886             if ((Flags = fcntl(STDIN_FILENO,F_GETFL,dummy)) < 0)
 887                _exit(100);
 888
 889             // Discard everything in stdin before forking dpkg
 890             if (fcntl(STDIN_FILENO,F_SETFL,Flags | O_NONBLOCK) < 0)
 891                _exit(100);
 892
 893             while (read(STDIN_FILENO,&dummy,1) == 1);
 894
 895             if (fcntl(STDIN_FILENO,F_SETFL,Flags & (~(long)O_NONBLOCK)) < 0)
 896                _exit(100);
 897          }
 898
 899          /* No Job Control Stop Env is a magic dpkg var that prevents it
 900             from using sigstop */
 901          putenv((char *)"DPKG_NO_TSTP=yes");
 902          execvp(Args[0],(char **)Args);
 903          cerr << "Could not exec dpkg!" << endl;
 904          _exit(100);
 905       }
 906
 907       // apply ionice
 908       if (_config->FindB("DPkg::UseIoNice", false) == true)
 909          ionice(Child);
 910
 911       // clear the Keep-Fd again
 912       _config->Clear("APT::Keep-Fds",fd[1]);
 913
 914       // Wait for dpkg
 915       int Status = 0;
 916
 917       // we read from dpkg here
 918       int const _dpkgin = fd[0];
 919       close(fd[1]);                        // close the write end of the pipe
 920
 921       if(slave > 0)
 922          close(slave);
 923
 924       // setups fds
 925       sigemptyset(&sigmask);
 926       sigprocmask(SIG_BLOCK,&sigmask,&original_sigmask);
 927
 928       // the result of the waitpid call
 929       int res;
 930       int select_ret;
 931       while ((res=waitpid(Child,&Status, WNOHANG)) != Child) {
 932          if(res < 0) {
 933             // FIXME: move this to a function or something, looks ugly here
 934             // error handling, waitpid returned -1
 935             if (errno == EINTR)
 936                continue;
 937             RunScripts("DPkg::Post-Invoke");
 938
 939             // Restore sig int/quit
 940             signal(SIGQUIT,old_SIGQUIT);
 941             signal(SIGINT,old_SIGINT);
 942             signal(SIGHUP,old_SIGHUP);
 943             return _error->Errno("waitpid","Couldn't wait for subprocess");
 944          }
 945
 946          // wait for input or output here
 947          FD_ZERO(&rfds);
 948          if (!stdin_is_dev_null)
 949             FD_SET(0, &rfds);
 950          FD_SET(_dpkgin, &rfds);
 951          if(master >= 0)
 952             FD_SET(master, &rfds);
 953          tv.tv_sec = 1;
 954          tv.tv_nsec = 0;
 955          select_ret = pselect(max(master, _dpkgin)+1, &rfds, NULL, NULL,
 956                               &tv, &original_sigmask);
 957          if (select_ret < 0 && (errno == EINVAL || errno == ENOSYS))
 958             select_ret = racy_pselect(max(master, _dpkgin)+1, &rfds, NULL,
 959                                       NULL, &tv, &original_sigmask);
 960          if (select_ret == 0)
 961             continue;
 962          else if (select_ret < 0 && errno == EINTR)
 963             continue;
 964          else if (select_ret < 0)
 965          {
 966             perror("select() returned error");
 967             continue;
 968          }
 969
 970          if(master >= 0 && FD_ISSET(master, &rfds))
 971             DoTerminalPty(master);
 972          if(master >= 0 && FD_ISSET(0, &rfds))
 973             DoStdin(master);
 974          if(FD_ISSET(_dpkgin, &rfds))
 975             DoDpkgStatusFd(_dpkgin, OutStatusFd);
 976       }
 977       close(_dpkgin);
 978
 979       // Restore sig int/quit
 980       signal(SIGQUIT,old_SIGQUIT);
 981       signal(SIGINT,old_SIGINT);
 982       signal(SIGHUP,old_SIGHUP);
 983
 984       if(master >= 0)
 985       {
 986          tcsetattr(0, TCSAFLUSH, &tt);
 987          close(master);
 988       }
 989
 990       // Check for an error code.
 991       if (WIFEXITED(Status) == 0 || WEXITSTATUS(Status) != 0)
 992       {
 993          // if it was set to "keep-dpkg-runing" then we won't return
 994          // here but keep the loop going and just report it as a error
 995          // for later
 996          bool const stopOnError = _config->FindB("Dpkg::StopOnError",true);
 997
 998          if(stopOnError)
 999             RunScripts("DPkg::Post-Invoke");
1000
1001          if (WIFSIGNALED(Status) != 0 && WTERMSIG(Status) == SIGSEGV)
1002             _error->Error("Sub-process %s received a segmentation fault.",Args[0]);
1003          else if (WIFEXITED(Status) != 0)
1004             _error->Error("Sub-process %s returned an error code (%u)",Args[0],WEXITSTATUS(Status));
1005          else
1006             _error->Error("Sub-process %s exited unexpectedly",Args[0]);
1007
1008          if(stopOnError)
1009          {
1010             CloseLog();
1011             return false;
1012          }
1013       }
1014    }
1015    CloseLog();
1016
1017    if (RunScripts("DPkg::Post-Invoke") == false)
1018       return false;
1019
1020    Cache.writeStateFile(NULL);
1021    return true;
1022 }
1023                                                                         /*}}}*/
1024 // pkgDpkgPM::Reset - Dump the contents of the command list             /*{{{*/
1025 // ---------------------------------------------------------------------
1026 /* */
1027 void pkgDPkgPM::Reset()
1028 {
1029    List.erase(List.begin(),List.end());
1030 }
1031                                                                         /*}}}*/