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), history_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    // If the filename string begins with DPkg::Chroot-Directory, return the
 128    // substr that is within the chroot so dpkg can access it.
 129    string const chrootdir = _config->FindDir("DPkg::Chroot-Directory","/");
 130    if (chrootdir != "/" && File.find(chrootdir) == 0)
 131    {
 132       size_t len = chrootdir.length();
 133       if (chrootdir.at(len - 1) == '/')
 134         len--;
 135       List.push_back(Item(Item::Install,Pkg,File.substr(len)));
 136    }
 137    else
 138       List.push_back(Item(Item::Install,Pkg,File));
 139
 140    return true;
 141 }
 142                                                                         /*}}}*/
 143 // DPkgPM::Configure - Configure a package                              /*{{{*/
 144 // ---------------------------------------------------------------------
 145 /* Add a configure operation to the sequence list */
 146 bool pkgDPkgPM::Configure(PkgIterator Pkg)
 147 {
 148    if (Pkg.end() == true)
 149       return false;
 150
 151    List.push_back(Item(Item::Configure, Pkg));
 152
 153    // Use triggers for config calls if we configure "smart"
 154    // as otherwise Pre-Depends will not be satisfied, see #526774
 155    if (_config->FindB("DPkg::TriggersPending", false) == true)
 156       List.push_back(Item(Item::TriggersPending, PkgIterator()));
 157
 158    return true;
 159 }
 160                                                                         /*}}}*/
 161 // DPkgPM::Remove - Remove a package                                    /*{{{*/
 162 // ---------------------------------------------------------------------
 163 /* Add a remove operation to the sequence list */
 164 bool pkgDPkgPM::Remove(PkgIterator Pkg,bool Purge)
 165 {
 166    if (Pkg.end() == true)
 167       return false;
 168
 169    if (Purge == true)
 170       List.push_back(Item(Item::Purge,Pkg));
 171    else
 172       List.push_back(Item(Item::Remove,Pkg));
 173    return true;
 174 }
 175                                                                         /*}}}*/
 176 // DPkgPM::SendV2Pkgs - Send version 2 package info                     /*{{{*/
 177 // ---------------------------------------------------------------------
 178 /* This is part of the helper script communication interface, it sends
 179    very complete information down to the other end of the pipe.*/
 180 bool pkgDPkgPM::SendV2Pkgs(FILE *F)
 181 {
 182    fprintf(F,"VERSION 2\n");
 183
 184    /* Write out all of the configuration directives by walking the
 185       configuration tree */
 186    const Configuration::Item *Top = _config->Tree(0);
 187    for (; Top != 0;)
 188    {
 189       if (Top->Value.empty() == false)
 190       {
 191          fprintf(F,"%s=%s\n",
 192                  QuoteString(Top->FullTag(),"=\"\n").c_str(),
 193                  QuoteString(Top->Value,"\n").c_str());
 194       }
 195
 196       if (Top->Child != 0)
 197       {
 198          Top = Top->Child;
 199          continue;
 200       }
 201
 202       while (Top != 0 && Top->Next == 0)
 203          Top = Top->Parent;
 204       if (Top != 0)
 205          Top = Top->Next;
 206    }
 207    fprintf(F,"\n");
 208
 209    // Write out the package actions in order.
 210    for (vector<Item>::iterator I = List.begin(); I != List.end(); I++)
 211    {
 212       if(I->Pkg.end() == true)
 213          continue;
 214
 215       pkgDepCache::StateCache &S = Cache[I->Pkg];
 216
 217       fprintf(F,"%s ",I->Pkg.Name());
 218       // Current version
 219       if (I->Pkg->CurrentVer == 0)
 220          fprintf(F,"- ");
 221       else
 222          fprintf(F,"%s ",I->Pkg.CurrentVer().VerStr());
 223
 224       // Show the compare operator
 225       // Target version
 226       if (S.InstallVer != 0)
 227       {
 228          int Comp = 2;
 229          if (I->Pkg->CurrentVer != 0)
 230             Comp = S.InstVerIter(Cache).CompareVer(I->Pkg.CurrentVer());
 231          if (Comp < 0)
 232             fprintf(F,"> ");
 233          if (Comp == 0)
 234             fprintf(F,"= ");
 235          if (Comp > 0)
 236             fprintf(F,"< ");
 237          fprintf(F,"%s ",S.InstVerIter(Cache).VerStr());
 238       }
 239       else
 240          fprintf(F,"> - ");
 241
 242       // Show the filename/operation
 243       if (I->Op == Item::Install)
 244       {
 245          // No errors here..
 246          if (I->File[0] != '/')
 247             fprintf(F,"**ERROR**\n");
 248          else
 249             fprintf(F,"%s\n",I->File.c_str());
 250       }
 251       if (I->Op == Item::Configure)
 252          fprintf(F,"**CONFIGURE**\n");
 253       if (I->Op == Item::Remove ||
 254           I->Op == Item::Purge)
 255          fprintf(F,"**REMOVE**\n");
 256
 257       if (ferror(F) != 0)
 258          return false;
 259    }
 260    return true;
 261 }
 262                                                                         /*}}}*/
 263 // DPkgPM::RunScriptsWithPkgs - Run scripts with package names on stdin /*{{{*/
 264 // ---------------------------------------------------------------------
 265 /* This looks for a list of scripts to run from the configuration file
 266    each one is run and is fed on standard input a list of all .deb files
 267    that are due to be installed. */
 268 bool pkgDPkgPM::RunScriptsWithPkgs(const char *Cnf)
 269 {
 270    Configuration::Item const *Opts = _config->Tree(Cnf);
 271    if (Opts == 0 || Opts->Child == 0)
 272       return true;
 273    Opts = Opts->Child;
 274
 275    unsigned int Count = 1;
 276    for (; Opts != 0; Opts = Opts->Next, Count++)
 277    {
 278       if (Opts->Value.empty() == true)
 279          continue;
 280
 281       // Determine the protocol version
 282       string OptSec = Opts->Value;
 283       string::size_type Pos;
 284       if ((Pos = OptSec.find(' ')) == string::npos || Pos == 0)
 285          Pos = OptSec.length();
 286       OptSec = "DPkg::Tools::Options::" + string(Opts->Value.c_str(),Pos);
 287
 288       unsigned int Version = _config->FindI(OptSec+"::Version",1);
 289
 290       // Create the pipes
 291       int Pipes[2];
 292       if (pipe(Pipes) != 0)
 293          return _error->Errno("pipe","Failed to create IPC pipe to subprocess");
 294       SetCloseExec(Pipes[0],true);
 295       SetCloseExec(Pipes[1],true);
 296
 297       // Purified Fork for running the script
 298       pid_t Process = ExecFork();
 299       if (Process == 0)
 300       {
 301          // Setup the FDs
 302          dup2(Pipes[0],STDIN_FILENO);
 303          SetCloseExec(STDOUT_FILENO,false);
 304          SetCloseExec(STDIN_FILENO,false);
 305          SetCloseExec(STDERR_FILENO,false);
 306
 307          const char *Args[4];
 308          Args[0] = "/bin/sh";
 309          Args[1] = "-c";
 310          Args[2] = Opts->Value.c_str();
 311          Args[3] = 0;
 312          execv(Args[0],(char **)Args);
 313          _exit(100);
 314       }
 315       close(Pipes[0]);
 316       FILE *F = fdopen(Pipes[1],"w");
 317       if (F == 0)
 318          return _error->Errno("fdopen","Faild to open new FD");
 319
 320       // Feed it the filenames.
 321       bool Die = false;
 322       if (Version <= 1)
 323       {
 324          for (vector<Item>::iterator I = List.begin(); I != List.end(); I++)
 325          {
 326             // Only deal with packages to be installed from .deb
 327             if (I->Op != Item::Install)
 328                continue;
 329
 330             // No errors here..
 331             if (I->File[0] != '/')
 332                continue;
 333
 334             /* Feed the filename of each package that is pending install
 335                into the pipe. */
 336             fprintf(F,"%s\n",I->File.c_str());
 337             if (ferror(F) != 0)
 338             {
 339                Die = true;
 340                break;
 341             }
 342          }
 343       }
 344       else
 345          Die = !SendV2Pkgs(F);
 346
 347       fclose(F);
 348
 349       // Clean up the sub process
 350       if (ExecWait(Process,Opts->Value.c_str()) == false)
 351          return _error->Error("Failure running script %s",Opts->Value.c_str());
 352    }
 353
 354    return true;
 355 }
 356
 357                                                                         /*}}}*/
 358 // DPkgPM::DoStdin - Read stdin and pass to slave pty                   /*{{{*/
 359 // ---------------------------------------------------------------------
 360 /*
 361 */
 362 void pkgDPkgPM::DoStdin(int master)
 363 {
 364    unsigned char input_buf[256] = {0,};
 365    ssize_t len = read(0, input_buf, sizeof(input_buf));
 366    if (len)
 367       write(master, input_buf, len);
 368    else
 369       stdin_is_dev_null = true;
 370 }
 371                                                                         /*}}}*/
 372 // DPkgPM::DoTerminalPty - Read the terminal pty and write log          /*{{{*/
 373 // ---------------------------------------------------------------------
 374 /*
 375  * read the terminal pty and write log
 376  */
 377 void pkgDPkgPM::DoTerminalPty(int master)
 378 {
 379    unsigned char term_buf[1024] = {0,0, };
 380
 381    ssize_t len=read(master, term_buf, sizeof(term_buf));
 382    if(len == -1 && errno == EIO)
 383    {
 384       // this happens when the child is about to exit, we
 385       // give it time to actually exit, otherwise we run
 386       // into a race
 387       usleep(500000);
 388       return;
 389    }
 390    if(len <= 0)
 391       return;
 392    write(1, term_buf, len);
 393    if(term_out)
 394       fwrite(term_buf, len, sizeof(char), term_out);
 395 }
 396                                                                         /*}}}*/
 397 // DPkgPM::ProcessDpkgStatusBuf                                         /*{{{*/
 398 // ---------------------------------------------------------------------
 399 /*
 400  */
 401 void pkgDPkgPM::ProcessDpkgStatusLine(int OutStatusFd, char *line)
 402 {
 403    bool const Debug = _config->FindB("Debug::pkgDPkgProgressReporting",false);
 404    // the status we output
 405    ostringstream status;
 406
 407    if (Debug == true)
 408       std::clog << "got from dpkg '" << line << "'" << std::endl;
 409
 410
 411    /* dpkg sends strings like this:
 412       'status:   <pkg>:  <pkg  qstate>'
 413       errors look like this:
 414       '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
 415       and conffile-prompt like this
 416       'status: conffile-prompt: conffile : 'current-conffile' 'new-conffile' useredited distedited
 417
 418       Newer versions of dpkg sent also:
 419       'processing: install: pkg'
 420       'processing: configure: pkg'
 421       'processing: remove: pkg'
 422       'processing: purge: pkg' - but for apt is it a ignored "unknown" action
 423       'processing: trigproc: trigger'
 424
 425    */
 426    char* list[5];
 427    //        dpkg sends multiline error messages sometimes (see
 428    //        #374195 for a example. we should support this by
 429    //        either patching dpkg to not send multiline over the
 430    //        statusfd or by rewriting the code here to deal with
 431    //        it. for now we just ignore it and not crash
 432    TokSplitString(':', line, list, sizeof(list)/sizeof(list[0]));
 433    if( list[0] == NULL || list[1] == NULL || list[2] == NULL)
 434    {
 435       if (Debug == true)
 436          std::clog << "ignoring line: not enough ':'" << std::endl;
 437       return;
 438    }
 439    const char* const pkg = list[1];
 440    const char* action = _strstrip(list[2]);
 441
 442    // 'processing' from dpkg looks like
 443    // 'processing: action: pkg'
 444    if(strncmp(list[0], "processing", strlen("processing")) == 0)
 445    {
 446       char s[200];
 447       const char* const pkg_or_trigger = _strstrip(list[2]);
 448       action = _strstrip( list[1]);
 449       const std::pair<const char *, const char *> * const iter =
 450         std::find_if(PackageProcessingOpsBegin,
 451                      PackageProcessingOpsEnd,
 452                      MatchProcessingOp(action));
 453       if(iter == PackageProcessingOpsEnd)
 454       {
 455          if (Debug == true)
 456             std::clog << "ignoring unknown action: " << action << std::endl;
 457          return;
 458       }
 459       snprintf(s, sizeof(s), _(iter->second), pkg_or_trigger);
 460
 461       status << "pmstatus:" << pkg_or_trigger
 462              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 463              << ":" << s
 464              << endl;
 465       if(OutStatusFd > 0)
 466          write(OutStatusFd, status.str().c_str(), status.str().size());
 467       if (Debug == true)
 468          std::clog << "send: '" << status.str() << "'" << endl;
 469       return;
 470    }
 471
 472    if(strncmp(action,"error",strlen("error")) == 0)
 473    {
 474       status << "pmerror:" << 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    else if(strncmp(action,"conffile",strlen("conffile")) == 0)
 485    {
 486       status << "pmconffile:" << list[1]
 487              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 488              << ":" << list[3]
 489              << endl;
 490       if(OutStatusFd > 0)
 491          write(OutStatusFd, status.str().c_str(), status.str().size());
 492       if (Debug == true)
 493          std::clog << "send: '" << status.str() << "'" << endl;
 494       return;
 495    }
 496
 497    vector<struct DpkgState> const &states = PackageOps[pkg];
 498    const char *next_action = NULL;
 499    if(PackageOpsDone[pkg] < states.size())
 500       next_action = states[PackageOpsDone[pkg]].state;
 501    // check if the package moved to the next dpkg state
 502    if(next_action && (strcmp(action, next_action) == 0))
 503    {
 504       // only read the translation if there is actually a next
 505       // action
 506       const char *translation = _(states[PackageOpsDone[pkg]].str);
 507       char s[200];
 508       snprintf(s, sizeof(s), translation, pkg);
 509
 510       // we moved from one dpkg state to a new one, report that
 511       PackageOpsDone[pkg]++;
 512       PackagesDone++;
 513       // build the status str
 514       status << "pmstatus:" << pkg
 515              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 516              << ":" << s
 517              << endl;
 518       if(OutStatusFd > 0)
 519          write(OutStatusFd, status.str().c_str(), status.str().size());
 520       if (Debug == true)
 521          std::clog << "send: '" << status.str() << "'" << endl;
 522    }
 523    if (Debug == true)
 524       std::clog << "(parsed from dpkg) pkg: " << pkg
 525                 << " action: " << action << endl;
 526 }
 527                                                                         /*}}}*/
 528 // DPkgPM::DoDpkgStatusFd                                               /*{{{*/
 529 // ---------------------------------------------------------------------
 530 /*
 531  */
 532 void pkgDPkgPM::DoDpkgStatusFd(int statusfd, int OutStatusFd)
 533 {
 534    char *p, *q;
 535    int len;
 536
 537    len=read(statusfd, &dpkgbuf[dpkgbuf_pos], sizeof(dpkgbuf)-dpkgbuf_pos);
 538    dpkgbuf_pos += len;
 539    if(len <= 0)
 540       return;
 541
 542    // process line by line if we have a buffer
 543    p = q = dpkgbuf;
 544    while((q=(char*)memchr(p, '\n', dpkgbuf+dpkgbuf_pos-p)) != NULL)
 545    {
 546       *q = 0;
 547       ProcessDpkgStatusLine(OutStatusFd, p);
 548       p=q+1; // continue with next line
 549    }
 550
 551    // now move the unprocessed bits (after the final \n that is now a 0x0)
 552    // to the start and update dpkgbuf_pos
 553    p = (char*)memrchr(dpkgbuf, 0, dpkgbuf_pos);
 554    if(p == NULL)
 555       return;
 556
 557    // we are interessted in the first char *after* 0x0
 558    p++;
 559
 560    // move the unprocessed tail to the start and update pos
 561    memmove(dpkgbuf, p, p-dpkgbuf);
 562    dpkgbuf_pos = dpkgbuf+dpkgbuf_pos-p;
 563 }
 564                                                                         /*}}}*/
 565 // DPkgPM::WriteHistoryTag                                              /*{{{*/
 566 void pkgDPkgPM::WriteHistoryTag(string tag, string value)
 567 {
 568    if (value.size() > 0)
 569    {
 570       // poor mans rstrip(", ")
 571       if (value[value.size()-2] == ',' && value[value.size()-1] == ' ')
 572          value.erase(value.size() - 2, 2);
 573       fprintf(history_out, "%s: %s\n", tag.c_str(), value.c_str());
 574    }
 575 }                                                                       /*}}}*/
 576 // DPkgPM::OpenLog                                                      /*{{{*/
 577 bool pkgDPkgPM::OpenLog()
 578 {
 579    string const logdir = _config->FindDir("Dir::Log");
 580    if(not FileExists(logdir))
 581       return _error->Error(_("Directory '%s' missing"), logdir.c_str());
 582
 583    // get current time
 584    char timestr[200];
 585    time_t const t = time(NULL);
 586    struct tm const * const tmp = localtime(&t);
 587    strftime(timestr, sizeof(timestr), "%F  %T", tmp);
 588
 589    // open terminal log
 590    string const logfile_name = flCombine(logdir,
 591                                    _config->Find("Dir::Log::Terminal"));
 592    if (!logfile_name.empty())
 593    {
 594       term_out = fopen(logfile_name.c_str(),"a");
 595       if (term_out == NULL)
 596          return _error->WarningE("OpenLog", _("Could not open file '%s'"), logfile_name.c_str());
 597
 598       chmod(logfile_name.c_str(), 0600);
 599       fprintf(term_out, "\nLog started: %s\n", timestr);
 600    }
 601
 602    // write your history
 603    string const history_name = flCombine(logdir,
 604                                    _config->Find("Dir::Log::History"));
 605    if (!history_name.empty())
 606    {
 607       history_out = fopen(history_name.c_str(),"a");
 608       if (history_out == NULL)
 609          return _error->WarningE("OpenLog", _("Could not open file '%s'"), history_name.c_str());
 610       chmod(history_name.c_str(), 0644);
 611       fprintf(history_out, "\nStart-Date: %s\n", timestr);
 612       string remove, purge, install, upgrade, downgrade;
 613       for (pkgCache::PkgIterator I = Cache.PkgBegin(); I.end() == false; I++)
 614       {
 615          if (Cache[I].NewInstall())
 616             install += I.Name() + string(" (") + Cache[I].CandVersion + string("), ");
 617          else if (Cache[I].Upgrade())
 618             upgrade += I.Name() + string(" (") + Cache[I].CurVersion + string(", ") + Cache[I].CandVersion + string("), ");
 619          else if (Cache[I].Downgrade())
 620             downgrade += I.Name() + string(" (") + Cache[I].CurVersion + string(", ") + Cache[I].CandVersion + string("), ");
 621          else if (Cache[I].Delete())
 622          {
 623             if ((Cache[I].iFlags & pkgDepCache::Purge) == pkgDepCache::Purge)
 624                purge += I.Name() + string(" (") + Cache[I].CurVersion + string("), ");
 625             else
 626                remove += I.Name() + string(" (") + Cache[I].CurVersion + string("), ");
 627          }
 628       }
 629       if (_config->Exists("Commandline::AsString") == true)
 630          WriteHistoryTag("Commandline", _config->Find("Commandline::AsString"));
 631       WriteHistoryTag("Install", install);
 632       WriteHistoryTag("Upgrade", upgrade);
 633       WriteHistoryTag("Downgrade",downgrade);
 634       WriteHistoryTag("Remove",remove);
 635       WriteHistoryTag("Purge",purge);
 636       fflush(history_out);
 637    }
 638
 639    return true;
 640 }
 641                                                                         /*}}}*/
 642 // DPkg::CloseLog                                                       /*{{{*/
 643 bool pkgDPkgPM::CloseLog()
 644 {
 645    char timestr[200];
 646    time_t t = time(NULL);
 647    struct tm *tmp = localtime(&t);
 648    strftime(timestr, sizeof(timestr), "%F  %T", tmp);
 649
 650    if(term_out)
 651    {
 652       fprintf(term_out, "Log ended: ");
 653       fprintf(term_out, "%s", timestr);
 654       fprintf(term_out, "\n");
 655       fclose(term_out);
 656    }
 657    term_out = NULL;
 658
 659    if(history_out)
 660    {
 661       if (dpkg_error.size() > 0)
 662          fprintf(history_out, "Error: %s\n", dpkg_error.c_str());
 663       fprintf(history_out, "End-Date: %s\n", timestr);
 664       fclose(history_out);
 665    }
 666    history_out = NULL;
 667
 668    return true;
 669 }
 670                                                                         /*}}}*/
 671 /*{{{*/
 672 // This implements a racy version of pselect for those architectures
 673 // that don't have a working implementation.
 674 // FIXME: Probably can be removed on Lenny+1
 675 static int racy_pselect(int nfds, fd_set *readfds, fd_set *writefds,
 676    fd_set *exceptfds, const struct timespec *timeout,
 677    const sigset_t *sigmask)
 678 {
 679    sigset_t origmask;
 680    struct timeval tv;
 681    int retval;
 682
 683    tv.tv_sec = timeout->tv_sec;
 684    tv.tv_usec = timeout->tv_nsec/1000;
 685
 686    sigprocmask(SIG_SETMASK, sigmask, &origmask);
 687    retval = select(nfds, readfds, writefds, exceptfds, &tv);
 688    sigprocmask(SIG_SETMASK, &origmask, 0);
 689    return retval;
 690 }
 691 /*}}}*/
 692 // DPkgPM::Go - Run the sequence                                        /*{{{*/
 693 // ---------------------------------------------------------------------
 694 /* This globs the operations and calls dpkg
 695  *
 696  * If it is called with "OutStatusFd" set to a valid file descriptor
 697  * apt will report the install progress over this fd. It maps the
 698  * dpkg states a package goes through to human readable (and i10n-able)
 699  * names and calculates a percentage for each step.
 700 */
 701 bool pkgDPkgPM::Go(int OutStatusFd)
 702 {
 703    fd_set rfds;
 704    struct timespec tv;
 705    sigset_t sigmask;
 706    sigset_t original_sigmask;
 707
 708    unsigned int const MaxArgs = _config->FindI("Dpkg::MaxArgs",8*1024);
 709    unsigned int const MaxArgBytes = _config->FindI("Dpkg::MaxArgBytes",32*1024);
 710    bool const NoTriggers = _config->FindB("DPkg::NoTriggers", false);
 711
 712    if (RunScripts("DPkg::Pre-Invoke") == false)
 713       return false;
 714
 715    if (RunScriptsWithPkgs("DPkg::Pre-Install-Pkgs") == false)
 716       return false;
 717
 718    // support subpressing of triggers processing for special
 719    // cases like d-i that runs the triggers handling manually
 720    bool const SmartConf = (_config->Find("PackageManager::Configure", "all") != "all");
 721    bool const TriggersPending = _config->FindB("DPkg::TriggersPending", false);
 722    if (_config->FindB("DPkg::ConfigurePending", SmartConf) == true)
 723       List.push_back(Item(Item::ConfigurePending, PkgIterator()));
 724
 725    // map the dpkg states to the operations that are performed
 726    // (this is sorted in the same way as Item::Ops)
 727    static const struct DpkgState DpkgStatesOpMap[][7] = {
 728       // Install operation
 729       {
 730          {"half-installed", N_("Preparing %s")},
 731          {"unpacked", N_("Unpacking %s") },
 732          {NULL, NULL}
 733       },
 734       // Configure operation
 735       {
 736          {"unpacked",N_("Preparing to configure %s") },
 737          {"half-configured", N_("Configuring %s") },
 738          { "installed", N_("Installed %s")},
 739          {NULL, NULL}
 740       },
 741       // Remove operation
 742       {
 743          {"half-configured", N_("Preparing for removal of %s")},
 744          {"half-installed", N_("Removing %s")},
 745          {"config-files",  N_("Removed %s")},
 746          {NULL, NULL}
 747       },
 748       // Purge operation
 749       {
 750          {"config-files", N_("Preparing to completely remove %s")},
 751          {"not-installed", N_("Completely removed %s")},
 752          {NULL, NULL}
 753       },
 754    };
 755
 756    // init the PackageOps map, go over the list of packages that
 757    // that will be [installed|configured|removed|purged] and add
 758    // them to the PackageOps map (the dpkg states it goes through)
 759    // and the PackageOpsTranslations (human readable strings)
 760    for (vector<Item>::const_iterator I = List.begin(); I != List.end();I++)
 761    {
 762       if((*I).Pkg.end() == true)
 763          continue;
 764
 765       string const name = (*I).Pkg.Name();
 766       PackageOpsDone[name] = 0;
 767       for(int i=0; (DpkgStatesOpMap[(*I).Op][i]).state != NULL;  i++)
 768       {
 769          PackageOps[name].push_back(DpkgStatesOpMap[(*I).Op][i]);
 770          PackagesTotal++;
 771       }
 772    }
 773
 774    stdin_is_dev_null = false;
 775
 776    // create log
 777    OpenLog();
 778
 779    // this loop is runs once per operation
 780    for (vector<Item>::const_iterator I = List.begin(); I != List.end();)
 781    {
 782       // Do all actions with the same Op in one run
 783       vector<Item>::const_iterator J = I;
 784       if (TriggersPending == true)
 785          for (; J != List.end(); J++)
 786          {
 787             if (J->Op == I->Op)
 788                continue;
 789             if (J->Op != Item::TriggersPending)
 790                break;
 791             vector<Item>::const_iterator T = J + 1;
 792             if (T != List.end() && T->Op == I->Op)
 793                continue;
 794             break;
 795          }
 796       else
 797          for (; J != List.end() && J->Op == I->Op; J++)
 798             /* nothing */;
 799
 800       // Generate the argument list
 801       const char *Args[MaxArgs + 50];
 802
 803       // Now check if we are within the MaxArgs limit
 804       //
 805       // this code below is problematic, because it may happen that
 806       // the argument list is split in a way that A depends on B
 807       // and they are in the same "--configure A B" run
 808       // - with the split they may now be configured in different
 809       //   runs
 810       if (J - I > (signed)MaxArgs)
 811          J = I + MaxArgs;
 812
 813       unsigned int n = 0;
 814       unsigned long Size = 0;
 815       string const Tmp = _config->Find("Dir::Bin::dpkg","dpkg");
 816       Args[n++] = Tmp.c_str();
 817       Size += strlen(Args[n-1]);
 818
 819       // Stick in any custom dpkg options
 820       Configuration::Item const *Opts = _config->Tree("DPkg::Options");
 821       if (Opts != 0)
 822       {
 823          Opts = Opts->Child;
 824          for (; Opts != 0; Opts = Opts->Next)
 825          {
 826             if (Opts->Value.empty() == true)
 827                continue;
 828             Args[n++] = Opts->Value.c_str();
 829             Size += Opts->Value.length();
 830          }
 831       }
 832
 833       char status_fd_buf[20];
 834       int fd[2];
 835       pipe(fd);
 836
 837       Args[n++] = "--status-fd";
 838       Size += strlen(Args[n-1]);
 839       snprintf(status_fd_buf,sizeof(status_fd_buf),"%i", fd[1]);
 840       Args[n++] = status_fd_buf;
 841       Size += strlen(Args[n-1]);
 842
 843       switch (I->Op)
 844       {
 845          case Item::Remove:
 846          Args[n++] = "--force-depends";
 847          Size += strlen(Args[n-1]);
 848          Args[n++] = "--force-remove-essential";
 849          Size += strlen(Args[n-1]);
 850          Args[n++] = "--remove";
 851          Size += strlen(Args[n-1]);
 852          break;
 853
 854          case Item::Purge:
 855          Args[n++] = "--force-depends";
 856          Size += strlen(Args[n-1]);
 857          Args[n++] = "--force-remove-essential";
 858          Size += strlen(Args[n-1]);
 859          Args[n++] = "--purge";
 860          Size += strlen(Args[n-1]);
 861          break;
 862
 863          case Item::Configure:
 864          Args[n++] = "--configure";
 865          Size += strlen(Args[n-1]);
 866          break;
 867
 868          case Item::ConfigurePending:
 869          Args[n++] = "--configure";
 870          Size += strlen(Args[n-1]);
 871          Args[n++] = "--pending";
 872          Size += strlen(Args[n-1]);
 873          break;
 874
 875          case Item::TriggersPending:
 876          Args[n++] = "--triggers-only";
 877          Size += strlen(Args[n-1]);
 878          Args[n++] = "--pending";
 879          Size += strlen(Args[n-1]);
 880          break;
 881
 882          case Item::Install:
 883          Args[n++] = "--unpack";
 884          Size += strlen(Args[n-1]);
 885          Args[n++] = "--auto-deconfigure";
 886          Size += strlen(Args[n-1]);
 887          break;
 888       }
 889
 890       if (NoTriggers == true && I->Op != Item::TriggersPending &&
 891           I->Op != Item::ConfigurePending)
 892       {
 893          Args[n++] = "--no-triggers";
 894          Size += strlen(Args[n-1]);
 895       }
 896
 897       // Write in the file or package names
 898       if (I->Op == Item::Install)
 899       {
 900          for (;I != J && Size < MaxArgBytes; I++)
 901          {
 902             if (I->File[0] != '/')
 903                return _error->Error("Internal Error, Pathname to install is not absolute '%s'",I->File.c_str());
 904             Args[n++] = I->File.c_str();
 905             Size += strlen(Args[n-1]);
 906          }
 907       }
 908       else
 909       {
 910          for (;I != J && Size < MaxArgBytes; I++)
 911          {
 912             if((*I).Pkg.end() == true)
 913                continue;
 914             Args[n++] = I->Pkg.Name();
 915             Size += strlen(Args[n-1]);
 916          }
 917       }
 918       Args[n] = 0;
 919       J = I;
 920
 921       if (_config->FindB("Debug::pkgDPkgPM",false) == true)
 922       {
 923          for (unsigned int k = 0; k != n; k++)
 924             clog << Args[k] << ' ';
 925          clog << endl;
 926          continue;
 927       }
 928
 929       cout << flush;
 930       clog << flush;
 931       cerr << flush;
 932
 933       /* Mask off sig int/quit. We do this because dpkg also does when
 934          it forks scripts. What happens is that when you hit ctrl-c it sends
 935          it to all processes in the group. Since dpkg ignores the signal
 936          it doesn't die but we do! So we must also ignore it */
 937       sighandler_t old_SIGQUIT = signal(SIGQUIT,SIG_IGN);
 938       sighandler_t old_SIGINT = signal(SIGINT,SIG_IGN);
 939
 940       // ignore SIGHUP as well (debian #463030)
 941       sighandler_t old_SIGHUP = signal(SIGHUP,SIG_IGN);
 942
 943       struct    termios tt;
 944       struct    winsize win;
 945       int       master = -1;
 946       int       slave = -1;
 947
 948       // if tcgetattr does not return zero there was a error
 949       // and we do not do any pty magic
 950       if (tcgetattr(0, &tt) == 0)
 951       {
 952          ioctl(0, TIOCGWINSZ, (char *)&win);
 953          if (openpty(&master, &slave, NULL, &tt, &win) < 0)
 954          {
 955             const char *s = _("Can not write log, openpty() "
 956                               "failed (/dev/pts not mounted?)\n");
 957             fprintf(stderr, "%s",s);
 958             if(term_out)
 959               fprintf(term_out, "%s",s);
 960             master = slave = -1;
 961          }  else {
 962             struct termios rtt;
 963             rtt = tt;
 964             cfmakeraw(&rtt);
 965             rtt.c_lflag &= ~ECHO;
 966             rtt.c_lflag |= ISIG;
 967             // block SIGTTOU during tcsetattr to prevent a hang if
 968             // the process is a member of the background process group
 969             // http://www.opengroup.org/onlinepubs/000095399/functions/tcsetattr.html
 970             sigemptyset(&sigmask);
 971             sigaddset(&sigmask, SIGTTOU);
 972             sigprocmask(SIG_BLOCK,&sigmask, &original_sigmask);
 973             tcsetattr(0, TCSAFLUSH, &rtt);
 974             sigprocmask(SIG_SETMASK, &original_sigmask, 0);
 975          }
 976       }
 977
 978        // Fork dpkg
 979       pid_t Child;
 980       _config->Set("APT::Keep-Fds::",fd[1]);
 981       // send status information that we are about to fork dpkg
 982       if(OutStatusFd > 0) {
 983          ostringstream status;
 984          status << "pmstatus:dpkg-exec:"
 985                 << (PackagesDone/float(PackagesTotal)*100.0)
 986                 << ":" << _("Running dpkg")
 987                 << endl;
 988          write(OutStatusFd, status.str().c_str(), status.str().size());
 989       }
 990       Child = ExecFork();
 991
 992       // This is the child
 993       if (Child == 0)
 994       {
 995          if(slave >= 0 && master >= 0)
 996          {
 997             setsid();
 998             ioctl(slave, TIOCSCTTY, 0);
 999             close(master);
1000             dup2(slave, 0);
1001             dup2(slave, 1);
1002             dup2(slave, 2);
1003             close(slave);
1004          }
1005          close(fd[0]); // close the read end of the pipe
1006
1007          if (_config->FindDir("DPkg::Chroot-Directory","/") != "/")
1008          {
1009             std::cerr << "Chrooting into "
1010                       << _config->FindDir("DPkg::Chroot-Directory")
1011                       << std::endl;
1012             if (chroot(_config->FindDir("DPkg::Chroot-Directory","/").c_str()) != 0)
1013                _exit(100);
1014          }
1015
1016          if (chdir(_config->FindDir("DPkg::Run-Directory","/").c_str()) != 0)
1017             _exit(100);
1018
1019          if (_config->FindB("DPkg::FlushSTDIN",true) == true && isatty(STDIN_FILENO))
1020          {
1021             int Flags,dummy;
1022             if ((Flags = fcntl(STDIN_FILENO,F_GETFL,dummy)) < 0)
1023                _exit(100);
1024
1025             // Discard everything in stdin before forking dpkg
1026             if (fcntl(STDIN_FILENO,F_SETFL,Flags | O_NONBLOCK) < 0)
1027                _exit(100);
1028
1029             while (read(STDIN_FILENO,&dummy,1) == 1);
1030
1031             if (fcntl(STDIN_FILENO,F_SETFL,Flags & (~(long)O_NONBLOCK)) < 0)
1032                _exit(100);
1033          }
1034
1035          /* No Job Control Stop Env is a magic dpkg var that prevents it
1036             from using sigstop */
1037          putenv((char *)"DPKG_NO_TSTP=yes");
1038          execvp(Args[0],(char **)Args);
1039          cerr << "Could not exec dpkg!" << endl;
1040          _exit(100);
1041       }
1042
1043       // apply ionice
1044       if (_config->FindB("DPkg::UseIoNice", false) == true)
1045          ionice(Child);
1046
1047       // clear the Keep-Fd again
1048       _config->Clear("APT::Keep-Fds",fd[1]);
1049
1050       // Wait for dpkg
1051       int Status = 0;
1052
1053       // we read from dpkg here
1054       int const _dpkgin = fd[0];
1055       close(fd[1]);                        // close the write end of the pipe
1056
1057       if(slave > 0)
1058          close(slave);
1059
1060       // setups fds
1061       sigemptyset(&sigmask);
1062       sigprocmask(SIG_BLOCK,&sigmask,&original_sigmask);
1063
1064       // the result of the waitpid call
1065       int res;
1066       int select_ret;
1067       while ((res=waitpid(Child,&Status, WNOHANG)) != Child) {
1068          if(res < 0) {
1069             // FIXME: move this to a function or something, looks ugly here
1070             // error handling, waitpid returned -1
1071             if (errno == EINTR)
1072                continue;
1073             RunScripts("DPkg::Post-Invoke");
1074
1075             // Restore sig int/quit
1076             signal(SIGQUIT,old_SIGQUIT);
1077             signal(SIGINT,old_SIGINT);
1078             signal(SIGHUP,old_SIGHUP);
1079             return _error->Errno("waitpid","Couldn't wait for subprocess");
1080          }
1081
1082          // wait for input or output here
1083          FD_ZERO(&rfds);
1084          if (master >= 0 && !stdin_is_dev_null)
1085             FD_SET(0, &rfds);
1086          FD_SET(_dpkgin, &rfds);
1087          if(master >= 0)
1088             FD_SET(master, &rfds);
1089          tv.tv_sec = 1;
1090          tv.tv_nsec = 0;
1091          select_ret = pselect(max(master, _dpkgin)+1, &rfds, NULL, NULL,
1092                               &tv, &original_sigmask);
1093          if (select_ret < 0 && (errno == EINVAL || errno == ENOSYS))
1094             select_ret = racy_pselect(max(master, _dpkgin)+1, &rfds, NULL,
1095                                       NULL, &tv, &original_sigmask);
1096          if (select_ret == 0)
1097             continue;
1098          else if (select_ret < 0 && errno == EINTR)
1099             continue;
1100          else if (select_ret < 0)
1101          {
1102             perror("select() returned error");
1103             continue;
1104          }
1105
1106          if(master >= 0 && FD_ISSET(master, &rfds))
1107             DoTerminalPty(master);
1108          if(master >= 0 && FD_ISSET(0, &rfds))
1109             DoStdin(master);
1110          if(FD_ISSET(_dpkgin, &rfds))
1111             DoDpkgStatusFd(_dpkgin, OutStatusFd);
1112       }
1113       close(_dpkgin);
1114
1115       // Restore sig int/quit
1116       signal(SIGQUIT,old_SIGQUIT);
1117       signal(SIGINT,old_SIGINT);
1118       signal(SIGHUP,old_SIGHUP);
1119
1120       if(master >= 0)
1121       {
1122          tcsetattr(0, TCSAFLUSH, &tt);
1123          close(master);
1124       }
1125
1126       // Check for an error code.
1127       if (WIFEXITED(Status) == 0 || WEXITSTATUS(Status) != 0)
1128       {
1129          // if it was set to "keep-dpkg-runing" then we won't return
1130          // here but keep the loop going and just report it as a error
1131          // for later
1132          bool const stopOnError = _config->FindB("Dpkg::StopOnError",true);
1133
1134          if(stopOnError)
1135             RunScripts("DPkg::Post-Invoke");
1136
1137          if (WIFSIGNALED(Status) != 0 && WTERMSIG(Status) == SIGSEGV)
1138             strprintf(dpkg_error, "Sub-process %s received a segmentation fault.",Args[0]);
1139          else if (WIFEXITED(Status) != 0)
1140             strprintf(dpkg_error, "Sub-process %s returned an error code (%u)",Args[0],WEXITSTATUS(Status));
1141          else
1142             strprintf(dpkg_error, "Sub-process %s exited unexpectedly",Args[0]);
1143
1144          if(dpkg_error.size() > 0)
1145             _error->Error(dpkg_error.c_str());
1146
1147          if(stopOnError)
1148          {
1149             CloseLog();
1150             return false;
1151          }
1152       }
1153    }
1154    CloseLog();
1155
1156    if (RunScripts("DPkg::Post-Invoke") == false)
1157       return false;
1158
1159    Cache.writeStateFile(NULL);
1160    return true;
1161 }
1162                                                                         /*}}}*/
1163 // pkgDpkgPM::Reset - Dump the contents of the command list             /*{{{*/
1164 // ---------------------------------------------------------------------
1165 /* */
1166 void pkgDPkgPM::Reset()
1167 {
1168    List.erase(List.begin(),List.end());
1169 }
1170                                                                         /*}}}*/