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