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::WriteHistoryTag                                              /*{{{*/
 554 void pkgDPkgPM::WriteHistoryTag(string tag, string value)
 555 {
 556    if (value.size() > 0)
 557    {
 558       // poor mans rstrip(", ")
 559       if (value[value.size()-2] == ',' && value[value.size()-1] == ' ')
 560          value.erase(value.size() - 2, 2);
 561       fprintf(history_out, "%s: %s\n", tag.c_str(), value.c_str());
 562    }
 563 }                                                                       /*}}}*/
 564 // DPkgPM::OpenLog                                                      /*{{{*/
 565 bool pkgDPkgPM::OpenLog()
 566 {
 567    string const logdir = _config->FindDir("Dir::Log");
 568    if(not FileExists(logdir))
 569       return _error->Error(_("Directory '%s' missing"), logdir.c_str());
 570
 571    // get current time
 572    char timestr[200];
 573    time_t const t = time(NULL);
 574    struct tm const * const tmp = localtime(&t);
 575    strftime(timestr, sizeof(timestr), "%F  %T", tmp);
 576
 577    // open terminal log
 578    string const logfile_name = flCombine(logdir,
 579                                    _config->Find("Dir::Log::Terminal"));
 580    if (!logfile_name.empty())
 581    {
 582       term_out = fopen(logfile_name.c_str(),"a");
 583       if (term_out == NULL)
 584          return _error->WarningE("OpenLog", _("Could not open file '%s'"), logfile_name.c_str());
 585
 586       chmod(logfile_name.c_str(), 0600);
 587       fprintf(term_out, "\nLog started: %s\n", timestr);
 588    }
 589
 590    // write your history
 591    string const history_name = flCombine(logdir,
 592                                    _config->Find("Dir::Log::History"));
 593    if (!history_name.empty())
 594    {
 595       history_out = fopen(history_name.c_str(),"a");
 596       if (history_out == NULL)
 597          return _error->WarningE("OpenLog", _("Could not open file '%s'"), history_name.c_str());
 598       chmod(history_name.c_str(), 0644);
 599       fprintf(history_out, "\nStart-Date: %s\n", timestr);
 600       string remove, purge, install, upgrade, downgrade;
 601       for (pkgCache::PkgIterator I = Cache.PkgBegin(); I.end() == false; I++)
 602       {
 603          if (Cache[I].NewInstall())
 604             install += I.Name() + string(" (") + Cache[I].CandVersion + string("), ");
 605          else if (Cache[I].Upgrade())
 606             upgrade += I.Name() + string(" (") + Cache[I].CurVersion + string(", ") + Cache[I].CandVersion + string("), ");
 607          else if (Cache[I].Downgrade())
 608             downgrade += I.Name() + string(" (") + Cache[I].CurVersion + string(", ") + Cache[I].CandVersion + string("), ");
 609          else if (Cache[I].Delete())
 610          {
 611             if ((Cache[I].iFlags & pkgDepCache::Purge) == pkgDepCache::Purge)
 612                purge += I.Name() + string(" (") + Cache[I].CurVersion + string("), ");
 613             else
 614                remove += I.Name() + string(" (") + Cache[I].CurVersion + string("), ");
 615          }
 616       }
 617       WriteHistoryTag("Install", install);
 618       WriteHistoryTag("Upgrade", upgrade);
 619       WriteHistoryTag("Downgrade",downgrade);
 620       WriteHistoryTag("Remove",remove);
 621       WriteHistoryTag("Purge",purge);
 622       fflush(history_out);
 623    }
 624
 625    return true;
 626 }
 627                                                                         /*}}}*/
 628 // DPkg::CloseLog                                                       /*{{{*/
 629 bool pkgDPkgPM::CloseLog()
 630 {
 631    char timestr[200];
 632    time_t t = time(NULL);
 633    struct tm *tmp = localtime(&t);
 634    strftime(timestr, sizeof(timestr), "%F  %T", tmp);
 635
 636    if(term_out)
 637    {
 638       fprintf(term_out, "Log ended: ");
 639       fprintf(term_out, "%s", timestr);
 640       fprintf(term_out, "\n");
 641       fclose(term_out);
 642    }
 643    term_out = NULL;
 644
 645    if(history_out)
 646    {
 647       if (dpkg_error.size() > 0)
 648          fprintf(history_out, "Error: %s\n", dpkg_error.c_str());
 649       fprintf(history_out, "End-Date: %s\n", timestr);
 650       fclose(history_out);
 651    }
 652
 653    return true;
 654 }
 655                                                                         /*}}}*/
 656 /*{{{*/
 657 // This implements a racy version of pselect for those architectures
 658 // that don't have a working implementation.
 659 // FIXME: Probably can be removed on Lenny+1
 660 static int racy_pselect(int nfds, fd_set *readfds, fd_set *writefds,
 661    fd_set *exceptfds, const struct timespec *timeout,
 662    const sigset_t *sigmask)
 663 {
 664    sigset_t origmask;
 665    struct timeval tv;
 666    int retval;
 667
 668    tv.tv_sec = timeout->tv_sec;
 669    tv.tv_usec = timeout->tv_nsec/1000;
 670
 671    sigprocmask(SIG_SETMASK, sigmask, &origmask);
 672    retval = select(nfds, readfds, writefds, exceptfds, &tv);
 673    sigprocmask(SIG_SETMASK, &origmask, 0);
 674    return retval;
 675 }
 676 /*}}}*/
 677 // DPkgPM::Go - Run the sequence                                        /*{{{*/
 678 // ---------------------------------------------------------------------
 679 /* This globs the operations and calls dpkg
 680  *
 681  * If it is called with "OutStatusFd" set to a valid file descriptor
 682  * apt will report the install progress over this fd. It maps the
 683  * dpkg states a package goes through to human readable (and i10n-able)
 684  * names and calculates a percentage for each step.
 685 */
 686 bool pkgDPkgPM::Go(int OutStatusFd)
 687 {
 688    fd_set rfds;
 689    struct timespec tv;
 690    sigset_t sigmask;
 691    sigset_t original_sigmask;
 692
 693    unsigned int const MaxArgs = _config->FindI("Dpkg::MaxArgs",8*1024);
 694    unsigned int const MaxArgBytes = _config->FindI("Dpkg::MaxArgBytes",32*1024);
 695    bool const NoTriggers = _config->FindB("DPkg::NoTriggers", false);
 696
 697    if (RunScripts("DPkg::Pre-Invoke") == false)
 698       return false;
 699
 700    if (RunScriptsWithPkgs("DPkg::Pre-Install-Pkgs") == false)
 701       return false;
 702
 703    // support subpressing of triggers processing for special
 704    // cases like d-i that runs the triggers handling manually
 705    bool const SmartConf = (_config->Find("PackageManager::Configure", "all") != "all");
 706    bool const TriggersPending = _config->FindB("DPkg::TriggersPending", false);
 707    if (_config->FindB("DPkg::ConfigurePending", SmartConf) == true)
 708       List.push_back(Item(Item::ConfigurePending, PkgIterator()));
 709
 710    // map the dpkg states to the operations that are performed
 711    // (this is sorted in the same way as Item::Ops)
 712    static const struct DpkgState DpkgStatesOpMap[][7] = {
 713       // Install operation
 714       {
 715          {"half-installed", N_("Preparing %s")},
 716          {"unpacked", N_("Unpacking %s") },
 717          {NULL, NULL}
 718       },
 719       // Configure operation
 720       {
 721          {"unpacked",N_("Preparing to configure %s") },
 722          {"half-configured", N_("Configuring %s") },
 723          { "installed", N_("Installed %s")},
 724          {NULL, NULL}
 725       },
 726       // Remove operation
 727       {
 728          {"half-configured", N_("Preparing for removal of %s")},
 729          {"half-installed", N_("Removing %s")},
 730          {"config-files",  N_("Removed %s")},
 731          {NULL, NULL}
 732       },
 733       // Purge operation
 734       {
 735          {"config-files", N_("Preparing to completely remove %s")},
 736          {"not-installed", N_("Completely removed %s")},
 737          {NULL, NULL}
 738       },
 739    };
 740
 741    // init the PackageOps map, go over the list of packages that
 742    // that will be [installed|configured|removed|purged] and add
 743    // them to the PackageOps map (the dpkg states it goes through)
 744    // and the PackageOpsTranslations (human readable strings)
 745    for (vector<Item>::const_iterator I = List.begin(); I != List.end();I++)
 746    {
 747       if((*I).Pkg.end() == true)
 748          continue;
 749
 750       string const name = (*I).Pkg.Name();
 751       PackageOpsDone[name] = 0;
 752       for(int i=0; (DpkgStatesOpMap[(*I).Op][i]).state != NULL;  i++)
 753       {
 754          PackageOps[name].push_back(DpkgStatesOpMap[(*I).Op][i]);
 755          PackagesTotal++;
 756       }
 757    }
 758
 759    stdin_is_dev_null = false;
 760
 761    // create log
 762    OpenLog();
 763
 764    // this loop is runs once per operation
 765    for (vector<Item>::const_iterator I = List.begin(); I != List.end();)
 766    {
 767       // Do all actions with the same Op in one run
 768       vector<Item>::const_iterator J = I;
 769       if (TriggersPending == true)
 770          for (; J != List.end(); J++)
 771          {
 772             if (J->Op == I->Op)
 773                continue;
 774             if (J->Op != Item::TriggersPending)
 775                break;
 776             vector<Item>::const_iterator T = J + 1;
 777             if (T != List.end() && T->Op == I->Op)
 778                continue;
 779             break;
 780          }
 781       else
 782          for (; J != List.end() && J->Op == I->Op; J++)
 783             /* nothing */;
 784
 785       // Generate the argument list
 786       const char *Args[MaxArgs + 50];
 787
 788       // Now check if we are within the MaxArgs limit
 789       //
 790       // this code below is problematic, because it may happen that
 791       // the argument list is split in a way that A depends on B
 792       // and they are in the same "--configure A B" run
 793       // - with the split they may now be configured in different
 794       //   runs
 795       if (J - I > (signed)MaxArgs)
 796          J = I + MaxArgs;
 797
 798       unsigned int n = 0;
 799       unsigned long Size = 0;
 800       string const Tmp = _config->Find("Dir::Bin::dpkg","dpkg");
 801       Args[n++] = Tmp.c_str();
 802       Size += strlen(Args[n-1]);
 803
 804       // Stick in any custom dpkg options
 805       Configuration::Item const *Opts = _config->Tree("DPkg::Options");
 806       if (Opts != 0)
 807       {
 808          Opts = Opts->Child;
 809          for (; Opts != 0; Opts = Opts->Next)
 810          {
 811             if (Opts->Value.empty() == true)
 812                continue;
 813             Args[n++] = Opts->Value.c_str();
 814             Size += Opts->Value.length();
 815          }
 816       }
 817
 818       char status_fd_buf[20];
 819       int fd[2];
 820       pipe(fd);
 821
 822       Args[n++] = "--status-fd";
 823       Size += strlen(Args[n-1]);
 824       snprintf(status_fd_buf,sizeof(status_fd_buf),"%i", fd[1]);
 825       Args[n++] = status_fd_buf;
 826       Size += strlen(Args[n-1]);
 827
 828       switch (I->Op)
 829       {
 830          case Item::Remove:
 831          Args[n++] = "--force-depends";
 832          Size += strlen(Args[n-1]);
 833          Args[n++] = "--force-remove-essential";
 834          Size += strlen(Args[n-1]);
 835          Args[n++] = "--remove";
 836          Size += strlen(Args[n-1]);
 837          break;
 838
 839          case Item::Purge:
 840          Args[n++] = "--force-depends";
 841          Size += strlen(Args[n-1]);
 842          Args[n++] = "--force-remove-essential";
 843          Size += strlen(Args[n-1]);
 844          Args[n++] = "--purge";
 845          Size += strlen(Args[n-1]);
 846          break;
 847
 848          case Item::Configure:
 849          Args[n++] = "--configure";
 850          Size += strlen(Args[n-1]);
 851          break;
 852
 853          case Item::ConfigurePending:
 854          Args[n++] = "--configure";
 855          Size += strlen(Args[n-1]);
 856          Args[n++] = "--pending";
 857          Size += strlen(Args[n-1]);
 858          break;
 859
 860          case Item::TriggersPending:
 861          Args[n++] = "--triggers-only";
 862          Size += strlen(Args[n-1]);
 863          Args[n++] = "--pending";
 864          Size += strlen(Args[n-1]);
 865          break;
 866
 867          case Item::Install:
 868          Args[n++] = "--unpack";
 869          Size += strlen(Args[n-1]);
 870          Args[n++] = "--auto-deconfigure";
 871          Size += strlen(Args[n-1]);
 872          break;
 873       }
 874
 875       if (NoTriggers == true && I->Op != Item::TriggersPending &&
 876           I->Op != Item::ConfigurePending)
 877       {
 878          Args[n++] = "--no-triggers";
 879          Size += strlen(Args[n-1]);
 880       }
 881
 882       // Write in the file or package names
 883       if (I->Op == Item::Install)
 884       {
 885          for (;I != J && Size < MaxArgBytes; I++)
 886          {
 887             if (I->File[0] != '/')
 888                return _error->Error("Internal Error, Pathname to install is not absolute '%s'",I->File.c_str());
 889             Args[n++] = I->File.c_str();
 890             Size += strlen(Args[n-1]);
 891          }
 892       }
 893       else
 894       {
 895          for (;I != J && Size < MaxArgBytes; I++)
 896          {
 897             if((*I).Pkg.end() == true)
 898                continue;
 899             Args[n++] = I->Pkg.Name();
 900             Size += strlen(Args[n-1]);
 901          }
 902       }
 903       Args[n] = 0;
 904       J = I;
 905
 906       if (_config->FindB("Debug::pkgDPkgPM",false) == true)
 907       {
 908          for (unsigned int k = 0; k != n; k++)
 909             clog << Args[k] << ' ';
 910          clog << endl;
 911          continue;
 912       }
 913
 914       cout << flush;
 915       clog << flush;
 916       cerr << flush;
 917
 918       /* Mask off sig int/quit. We do this because dpkg also does when
 919          it forks scripts. What happens is that when you hit ctrl-c it sends
 920          it to all processes in the group. Since dpkg ignores the signal
 921          it doesn't die but we do! So we must also ignore it */
 922       sighandler_t old_SIGQUIT = signal(SIGQUIT,SIG_IGN);
 923       sighandler_t old_SIGINT = signal(SIGINT,SIG_IGN);
 924
 925       // ignore SIGHUP as well (debian #463030)
 926       sighandler_t old_SIGHUP = signal(SIGHUP,SIG_IGN);
 927
 928       struct    termios tt;
 929       struct    winsize win;
 930       int       master = -1;
 931       int       slave = -1;
 932
 933       // if tcgetattr does not return zero there was a error
 934       // and we do not do any pty magic
 935       if (tcgetattr(0, &tt) == 0)
 936       {
 937          ioctl(0, TIOCGWINSZ, (char *)&win);
 938          if (openpty(&master, &slave, NULL, &tt, &win) < 0)
 939          {
 940             const char *s = _("Can not write log, openpty() "
 941                               "failed (/dev/pts not mounted?)\n");
 942             fprintf(stderr, "%s",s);
 943             if(term_out)
 944               fprintf(term_out, "%s",s);
 945             master = slave = -1;
 946          }  else {
 947             struct termios rtt;
 948             rtt = tt;
 949             cfmakeraw(&rtt);
 950             rtt.c_lflag &= ~ECHO;
 951             // block SIGTTOU during tcsetattr to prevent a hang if
 952             // the process is a member of the background process group
 953             // http://www.opengroup.org/onlinepubs/000095399/functions/tcsetattr.html
 954             sigemptyset(&sigmask);
 955             sigaddset(&sigmask, SIGTTOU);
 956             sigprocmask(SIG_BLOCK,&sigmask, &original_sigmask);
 957             tcsetattr(0, TCSAFLUSH, &rtt);
 958             sigprocmask(SIG_SETMASK, &original_sigmask, 0);
 959          }
 960       }
 961
 962        // Fork dpkg
 963       pid_t Child;
 964       _config->Set("APT::Keep-Fds::",fd[1]);
 965       // send status information that we are about to fork dpkg
 966       if(OutStatusFd > 0) {
 967          ostringstream status;
 968          status << "pmstatus:dpkg-exec:"
 969                 << (PackagesDone/float(PackagesTotal)*100.0)
 970                 << ":" << _("Running dpkg")
 971                 << endl;
 972          write(OutStatusFd, status.str().c_str(), status.str().size());
 973       }
 974       Child = ExecFork();
 975
 976       // This is the child
 977       if (Child == 0)
 978       {
 979          if(slave >= 0 && master >= 0)
 980          {
 981             setsid();
 982             ioctl(slave, TIOCSCTTY, 0);
 983             close(master);
 984             dup2(slave, 0);
 985             dup2(slave, 1);
 986             dup2(slave, 2);
 987             close(slave);
 988          }
 989          close(fd[0]); // close the read end of the pipe
 990
 991          if (_config->FindDir("DPkg::Chroot-Directory","/") != "/")
 992          {
 993             std::cerr << "Chrooting into "
 994                       << _config->FindDir("DPkg::Chroot-Directory")
 995                       << std::endl;
 996             if (chroot(_config->FindDir("DPkg::Chroot-Directory","/").c_str()) != 0)
 997                _exit(100);
 998          }
 999
1000          if (chdir(_config->FindDir("DPkg::Run-Directory","/").c_str()) != 0)
1001             _exit(100);
1002
1003          if (_config->FindB("DPkg::FlushSTDIN",true) == true && isatty(STDIN_FILENO))
1004          {
1005             int Flags,dummy;
1006             if ((Flags = fcntl(STDIN_FILENO,F_GETFL,dummy)) < 0)
1007                _exit(100);
1008
1009             // Discard everything in stdin before forking dpkg
1010             if (fcntl(STDIN_FILENO,F_SETFL,Flags | O_NONBLOCK) < 0)
1011                _exit(100);
1012
1013             while (read(STDIN_FILENO,&dummy,1) == 1);
1014
1015             if (fcntl(STDIN_FILENO,F_SETFL,Flags & (~(long)O_NONBLOCK)) < 0)
1016                _exit(100);
1017          }
1018
1019          /* No Job Control Stop Env is a magic dpkg var that prevents it
1020             from using sigstop */
1021          putenv((char *)"DPKG_NO_TSTP=yes");
1022          execvp(Args[0],(char **)Args);
1023          cerr << "Could not exec dpkg!" << endl;
1024          _exit(100);
1025       }
1026
1027       // apply ionice
1028       if (_config->FindB("DPkg::UseIoNice", false) == true)
1029          ionice(Child);
1030
1031       // clear the Keep-Fd again
1032       _config->Clear("APT::Keep-Fds",fd[1]);
1033
1034       // Wait for dpkg
1035       int Status = 0;
1036
1037       // we read from dpkg here
1038       int const _dpkgin = fd[0];
1039       close(fd[1]);                        // close the write end of the pipe
1040
1041       if(slave > 0)
1042          close(slave);
1043
1044       // setups fds
1045       sigemptyset(&sigmask);
1046       sigprocmask(SIG_BLOCK,&sigmask,&original_sigmask);
1047
1048       // the result of the waitpid call
1049       int res;
1050       int select_ret;
1051       while ((res=waitpid(Child,&Status, WNOHANG)) != Child) {
1052          if(res < 0) {
1053             // FIXME: move this to a function or something, looks ugly here
1054             // error handling, waitpid returned -1
1055             if (errno == EINTR)
1056                continue;
1057             RunScripts("DPkg::Post-Invoke");
1058
1059             // Restore sig int/quit
1060             signal(SIGQUIT,old_SIGQUIT);
1061             signal(SIGINT,old_SIGINT);
1062             signal(SIGHUP,old_SIGHUP);
1063             return _error->Errno("waitpid","Couldn't wait for subprocess");
1064          }
1065
1066          // wait for input or output here
1067          FD_ZERO(&rfds);
1068          if (master >= 0 && !stdin_is_dev_null)
1069             FD_SET(0, &rfds);
1070          FD_SET(_dpkgin, &rfds);
1071          if(master >= 0)
1072             FD_SET(master, &rfds);
1073          tv.tv_sec = 1;
1074          tv.tv_nsec = 0;
1075          select_ret = pselect(max(master, _dpkgin)+1, &rfds, NULL, NULL,
1076                               &tv, &original_sigmask);
1077          if (select_ret < 0 && (errno == EINVAL || errno == ENOSYS))
1078             select_ret = racy_pselect(max(master, _dpkgin)+1, &rfds, NULL,
1079                                       NULL, &tv, &original_sigmask);
1080          if (select_ret == 0)
1081             continue;
1082          else if (select_ret < 0 && errno == EINTR)
1083             continue;
1084          else if (select_ret < 0)
1085          {
1086             perror("select() returned error");
1087             continue;
1088          }
1089
1090          if(master >= 0 && FD_ISSET(master, &rfds))
1091             DoTerminalPty(master);
1092          if(master >= 0 && FD_ISSET(0, &rfds))
1093             DoStdin(master);
1094          if(FD_ISSET(_dpkgin, &rfds))
1095             DoDpkgStatusFd(_dpkgin, OutStatusFd);
1096       }
1097       close(_dpkgin);
1098
1099       // Restore sig int/quit
1100       signal(SIGQUIT,old_SIGQUIT);
1101       signal(SIGINT,old_SIGINT);
1102       signal(SIGHUP,old_SIGHUP);
1103
1104       if(master >= 0)
1105       {
1106          tcsetattr(0, TCSAFLUSH, &tt);
1107          close(master);
1108       }
1109
1110       // Check for an error code.
1111       if (WIFEXITED(Status) == 0 || WEXITSTATUS(Status) != 0)
1112       {
1113          // if it was set to "keep-dpkg-runing" then we won't return
1114          // here but keep the loop going and just report it as a error
1115          // for later
1116          bool const stopOnError = _config->FindB("Dpkg::StopOnError",true);
1117
1118          if(stopOnError)
1119             RunScripts("DPkg::Post-Invoke");
1120
1121          if (WIFSIGNALED(Status) != 0 && WTERMSIG(Status) == SIGSEGV)
1122             strprintf(dpkg_error, "Sub-process %s received a segmentation fault.",Args[0]);
1123          else if (WIFEXITED(Status) != 0)
1124             strprintf(dpkg_error, "Sub-process %s returned an error code (%u)",Args[0],WEXITSTATUS(Status));
1125          else
1126             strprintf(dpkg_error, "Sub-process %s exited unexpectedly",Args[0]);
1127
1128          if(dpkg_error.size() > 0)
1129             _error->Error(dpkg_error.c_str());
1130
1131          if(stopOnError)
1132          {
1133             CloseLog();
1134             return false;
1135          }
1136       }
1137    }
1138    CloseLog();
1139
1140    if (RunScripts("DPkg::Post-Invoke") == false)
1141       return false;
1142
1143    Cache.writeStateFile(NULL);
1144    return true;
1145 }
1146                                                                         /*}}}*/
1147 // pkgDpkgPM::Reset - Dump the contents of the command list             /*{{{*/
1148 // ---------------------------------------------------------------------
1149 /* */
1150 void pkgDPkgPM::Reset()
1151 {
1152    List.erase(List.begin(),List.end());
1153 }
1154                                                                         /*}}}*/