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