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/pkgrecords.h>
  16 #include <apt-pkg/strutl.h>
  17 #include <apti18n.h>
  18 #include <apt-pkg/fileutl.h>
  19
  20 #include <unistd.h>
  21 #include <stdlib.h>
  22 #include <fcntl.h>
  23 #include <sys/select.h>
  24 #include <sys/types.h>
  25 #include <sys/wait.h>
  26 #include <signal.h>
  27 #include <errno.h>
  28 #include <string.h>
  29 #include <stdio.h>
  30 #include <string.h>
  31 #include <algorithm>
  32 #include <sstream>
  33 #include <map>
  34
  35 #include <termios.h>
  36 #include <unistd.h>
  37 #include <sys/ioctl.h>
  38 #include <pty.h>
  39
  40 #include <config.h>
  41 #include <apti18n.h>
  42                                                                         /*}}}*/
  43
  44 using namespace std;
  45
  46 namespace
  47 {
  48   // Maps the dpkg "processing" info to human readable names.  Entry 0
  49   // of each array is the key, entry 1 is the value.
  50   const std::pair<const char *, const char *> PackageProcessingOps[] = {
  51     std::make_pair("install",   N_("Installing %s")),
  52     std::make_pair("configure", N_("Configuring %s")),
  53     std::make_pair("remove",    N_("Removing %s")),
  54     std::make_pair("trigproc",  N_("Running post-installation trigger %s"))
  55   };
  56
  57   const std::pair<const char *, const char *> * const PackageProcessingOpsBegin = PackageProcessingOps;
  58   const std::pair<const char *, const char *> * const PackageProcessingOpsEnd   = PackageProcessingOps + sizeof(PackageProcessingOps) / sizeof(PackageProcessingOps[0]);
  59
  60   // Predicate to test whether an entry in the PackageProcessingOps
  61   // array matches a string.
  62   class MatchProcessingOp
  63   {
  64     const char *target;
  65
  66   public:
  67     MatchProcessingOp(const char *the_target)
  68       : target(the_target)
  69     {
  70     }
  71
  72     bool operator()(const std::pair<const char *, const char *> &pair) const
  73     {
  74       return strcmp(pair.first, target) == 0;
  75     }
  76   };
  77 }
  78
  79 /* helper function to ionice the given PID
  80
  81  there is no C header for ionice yet - just the syscall interface
  82  so we use the binary from util-linux
  83 */
  84 static bool
  85 ionice(int PID)
  86 {
  87    if (!FileExists("/usr/bin/ionice"))
  88       return false;
  89    pid_t Process = ExecFork();
  90    if (Process == 0)
  91    {
  92       char buf[32];
  93       snprintf(buf, sizeof(buf), "-p%d", PID);
  94       const char *Args[4];
  95       Args[0] = "/usr/bin/ionice";
  96       Args[1] = "-c3";
  97       Args[2] = buf;
  98       Args[3] = 0;
  99       execv(Args[0], (char **)Args);
 100    }
 101    return ExecWait(Process, "ionice");
 102 }
 103
 104 // DPkgPM::pkgDPkgPM - Constructor                                      /*{{{*/
 105 // ---------------------------------------------------------------------
 106 /* */
 107 pkgDPkgPM::pkgDPkgPM(pkgDepCache *Cache)
 108    : pkgPackageManager(Cache), dpkgbuf_pos(0),
 109      term_out(NULL), PackagesDone(0), PackagesTotal(0), pkgFailures(0)
 110 {
 111 }
 112                                                                         /*}}}*/
 113 // DPkgPM::pkgDPkgPM - Destructor                                       /*{{{*/
 114 // ---------------------------------------------------------------------
 115 /* */
 116 pkgDPkgPM::~pkgDPkgPM()
 117 {
 118 }
 119                                                                         /*}}}*/
 120 // DPkgPM::Install - Install a package                                  /*{{{*/
 121 // ---------------------------------------------------------------------
 122 /* Add an install operation to the sequence list */
 123 bool pkgDPkgPM::Install(PkgIterator Pkg,string File)
 124 {
 125    if (File.empty() == true || Pkg.end() == true)
 126       return _error->Error("Internal Error, No file name for %s",Pkg.Name());
 127
 128    List.push_back(Item(Item::Install,Pkg,File));
 129    return true;
 130 }
 131                                                                         /*}}}*/
 132 // DPkgPM::Configure - Configure a package                              /*{{{*/
 133 // ---------------------------------------------------------------------
 134 /* Add a configure operation to the sequence list */
 135 bool pkgDPkgPM::Configure(PkgIterator Pkg)
 136 {
 137    if (Pkg.end() == true)
 138       return false;
 139
 140    List.push_back(Item(Item::Configure,Pkg));
 141    return true;
 142 }
 143                                                                         /*}}}*/
 144 // DPkgPM::Remove - Remove a package                                    /*{{{*/
 145 // ---------------------------------------------------------------------
 146 /* Add a remove operation to the sequence list */
 147 bool pkgDPkgPM::Remove(PkgIterator Pkg,bool Purge)
 148 {
 149    if (Pkg.end() == true)
 150       return false;
 151
 152    if (Purge == true)
 153       List.push_back(Item(Item::Purge,Pkg));
 154    else
 155       List.push_back(Item(Item::Remove,Pkg));
 156    return true;
 157 }
 158                                                                         /*}}}*/
 159 // DPkgPM::SendV2Pkgs - Send version 2 package info                     /*{{{*/
 160 // ---------------------------------------------------------------------
 161 /* This is part of the helper script communication interface, it sends
 162    very complete information down to the other end of the pipe.*/
 163 bool pkgDPkgPM::SendV2Pkgs(FILE *F)
 164 {
 165    fprintf(F,"VERSION 2\n");
 166
 167    /* Write out all of the configuration directives by walking the
 168       configuration tree */
 169    const Configuration::Item *Top = _config->Tree(0);
 170    for (; Top != 0;)
 171    {
 172       if (Top->Value.empty() == false)
 173       {
 174          fprintf(F,"%s=%s\n",
 175                  QuoteString(Top->FullTag(),"=\"\n").c_str(),
 176                  QuoteString(Top->Value,"\n").c_str());
 177       }
 178
 179       if (Top->Child != 0)
 180       {
 181          Top = Top->Child;
 182          continue;
 183       }
 184
 185       while (Top != 0 && Top->Next == 0)
 186          Top = Top->Parent;
 187       if (Top != 0)
 188          Top = Top->Next;
 189    }
 190    fprintf(F,"\n");
 191
 192    // Write out the package actions in order.
 193    for (vector<Item>::iterator I = List.begin(); I != List.end(); I++)
 194    {
 195       pkgDepCache::StateCache &S = Cache[I->Pkg];
 196
 197       fprintf(F,"%s ",I->Pkg.Name());
 198       // Current version
 199       if (I->Pkg->CurrentVer == 0)
 200          fprintf(F,"- ");
 201       else
 202          fprintf(F,"%s ",I->Pkg.CurrentVer().VerStr());
 203
 204       // Show the compare operator
 205       // Target version
 206       if (S.InstallVer != 0)
 207       {
 208          int Comp = 2;
 209          if (I->Pkg->CurrentVer != 0)
 210             Comp = S.InstVerIter(Cache).CompareVer(I->Pkg.CurrentVer());
 211          if (Comp < 0)
 212             fprintf(F,"> ");
 213          if (Comp == 0)
 214             fprintf(F,"= ");
 215          if (Comp > 0)
 216             fprintf(F,"< ");
 217          fprintf(F,"%s ",S.InstVerIter(Cache).VerStr());
 218       }
 219       else
 220          fprintf(F,"> - ");
 221
 222       // Show the filename/operation
 223       if (I->Op == Item::Install)
 224       {
 225          // No errors here..
 226          if (I->File[0] != '/')
 227             fprintf(F,"**ERROR**\n");
 228          else
 229             fprintf(F,"%s\n",I->File.c_str());
 230       }
 231       if (I->Op == Item::Configure)
 232          fprintf(F,"**CONFIGURE**\n");
 233       if (I->Op == Item::Remove ||
 234           I->Op == Item::Purge)
 235          fprintf(F,"**REMOVE**\n");
 236
 237       if (ferror(F) != 0)
 238          return false;
 239    }
 240    return true;
 241 }
 242                                                                         /*}}}*/
 243 // DPkgPM::RunScriptsWithPkgs - Run scripts with package names on stdin /*{{{*/
 244 // ---------------------------------------------------------------------
 245 /* This looks for a list of scripts to run from the configuration file
 246    each one is run and is fed on standard input a list of all .deb files
 247    that are due to be installed. */
 248 bool pkgDPkgPM::RunScriptsWithPkgs(const char *Cnf)
 249 {
 250    Configuration::Item const *Opts = _config->Tree(Cnf);
 251    if (Opts == 0 || Opts->Child == 0)
 252       return true;
 253    Opts = Opts->Child;
 254
 255    unsigned int Count = 1;
 256    for (; Opts != 0; Opts = Opts->Next, Count++)
 257    {
 258       if (Opts->Value.empty() == true)
 259          continue;
 260
 261       // Determine the protocol version
 262       string OptSec = Opts->Value;
 263       string::size_type Pos;
 264       if ((Pos = OptSec.find(' ')) == string::npos || Pos == 0)
 265          Pos = OptSec.length();
 266       OptSec = "DPkg::Tools::Options::" + string(Opts->Value.c_str(),Pos);
 267
 268       unsigned int Version = _config->FindI(OptSec+"::Version",1);
 269
 270       // Create the pipes
 271       int Pipes[2];
 272       if (pipe(Pipes) != 0)
 273          return _error->Errno("pipe","Failed to create IPC pipe to subprocess");
 274       SetCloseExec(Pipes[0],true);
 275       SetCloseExec(Pipes[1],true);
 276
 277       // Purified Fork for running the script
 278       pid_t Process = ExecFork();
 279       if (Process == 0)
 280       {
 281          // Setup the FDs
 282          dup2(Pipes[0],STDIN_FILENO);
 283          SetCloseExec(STDOUT_FILENO,false);
 284          SetCloseExec(STDIN_FILENO,false);
 285          SetCloseExec(STDERR_FILENO,false);
 286
 287          const char *Args[4];
 288          Args[0] = "/bin/sh";
 289          Args[1] = "-c";
 290          Args[2] = Opts->Value.c_str();
 291          Args[3] = 0;
 292          execv(Args[0],(char **)Args);
 293          _exit(100);
 294       }
 295       close(Pipes[0]);
 296       FILE *F = fdopen(Pipes[1],"w");
 297       if (F == 0)
 298          return _error->Errno("fdopen","Faild to open new FD");
 299
 300       // Feed it the filenames.
 301       bool Die = false;
 302       if (Version <= 1)
 303       {
 304          for (vector<Item>::iterator I = List.begin(); I != List.end(); I++)
 305          {
 306             // Only deal with packages to be installed from .deb
 307             if (I->Op != Item::Install)
 308                continue;
 309
 310             // No errors here..
 311             if (I->File[0] != '/')
 312                continue;
 313
 314             /* Feed the filename of each package that is pending install
 315                into the pipe. */
 316             fprintf(F,"%s\n",I->File.c_str());
 317             if (ferror(F) != 0)
 318             {
 319                Die = true;
 320                break;
 321             }
 322          }
 323       }
 324       else
 325          Die = !SendV2Pkgs(F);
 326
 327       fclose(F);
 328
 329       // Clean up the sub process
 330       if (ExecWait(Process,Opts->Value.c_str()) == false)
 331          return _error->Error("Failure running script %s",Opts->Value.c_str());
 332    }
 333
 334    return true;
 335 }
 336                                                                         /*}}}*/
 337 // DPkgPM::DoStdin - Read stdin and pass to slave pty                   /*{{{*/
 338 // ---------------------------------------------------------------------
 339 /*
 340 */
 341 void pkgDPkgPM::DoStdin(int master)
 342 {
 343    unsigned char input_buf[256] = {0,};
 344    ssize_t len = read(0, input_buf, sizeof(input_buf));
 345    if (len)
 346       write(master, input_buf, len);
 347    else
 348       stdin_is_dev_null = true;
 349 }
 350                                                                         /*}}}*/
 351 // DPkgPM::DoTerminalPty - Read the terminal pty and write log          /*{{{*/
 352 // ---------------------------------------------------------------------
 353 /*
 354  * read the terminal pty and write log
 355  */
 356 void pkgDPkgPM::DoTerminalPty(int master)
 357 {
 358    unsigned char term_buf[1024] = {0,0, };
 359
 360    ssize_t len=read(master, term_buf, sizeof(term_buf));
 361    if(len == -1 && errno == EIO)
 362    {
 363       // this happens when the child is about to exit, we
 364       // give it time to actually exit, otherwise we run
 365       // into a race
 366       usleep(500000);
 367       return;
 368    }
 369    if(len <= 0)
 370       return;
 371    write(1, term_buf, len);
 372    if(term_out)
 373       fwrite(term_buf, len, sizeof(char), term_out);
 374 }
 375                                                                         /*}}}*/
 376 // DPkgPM::ProcessDpkgStatusBuf                                         /*{{{*/
 377 // ---------------------------------------------------------------------
 378 /*
 379  */
 380 void pkgDPkgPM::ProcessDpkgStatusLine(int OutStatusFd, char *line)
 381 {
 382    // the status we output
 383    ostringstream status;
 384
 385    if (_config->FindB("Debug::pkgDPkgProgressReporting",false) == true)
 386       std::clog << "got from dpkg '" << line << "'" << std::endl;
 387
 388
 389    /* dpkg sends strings like this:
 390       'status:   <pkg>:  <pkg  qstate>'
 391       errors look like this:
 392       'status: /var/cache/apt/archives/krecipes_0.8.1-0ubuntu1_i386.deb : error : trying to overwrite `/usr/share/doc/kde/HTML/en/krecipes/krectip.png', which is also in package krecipes-data
 393       and conffile-prompt like this
 394       'status: conffile-prompt: conffile : 'current-conffile' 'new-conffile' useredited distedited
 395
 396       Newer versions of dpkg sent also:
 397       'processing: install: pkg'
 398       'processing: configure: pkg'
 399       'processing: remove: pkg'
 400       'processing: trigproc: trigger'
 401
 402    */
 403    char* list[6];
 404    //        dpkg sends multiline error messages sometimes (see
 405    //        #374195 for a example. we should support this by
 406    //        either patching dpkg to not send multiline over the
 407    //        statusfd or by rewriting the code here to deal with
 408    //        it. for now we just ignore it and not crash
 409    TokSplitString(':', line, list, sizeof(list)/sizeof(list[0]));
 410    if( list[0] == NULL || list[1] == NULL || list[2] == NULL)
 411    {
 412       if (_config->FindB("Debug::pkgDPkgProgressReporting",false) == true)
 413          std::clog << "ignoring line: not enough ':'" << std::endl;
 414       return;
 415    }
 416    char *pkg = list[1];
 417    char *action = _strstrip(list[2]);
 418
 419    // 'processing' from dpkg looks like
 420    // 'processing: action: pkg'
 421    if(strncmp(list[0], "processing", strlen("processing")) == 0)
 422    {
 423       char s[200];
 424       char *pkg_or_trigger = _strstrip(list[2]);
 425       action =_strstrip( list[1]);
 426       const std::pair<const char *, const char *> * const iter =
 427         std::find_if(PackageProcessingOpsBegin,
 428                      PackageProcessingOpsEnd,
 429                      MatchProcessingOp(action));
 430       if(iter == PackageProcessingOpsEnd)
 431       {
 432          if (_config->FindB("Debug::pkgDPkgProgressReporting",false) == true)
 433             std::clog << "ignoring unknwon action: " << action << std::endl;
 434          return;
 435       }
 436       snprintf(s, sizeof(s), _(iter->second), pkg_or_trigger);
 437
 438       status << "pmstatus:" << pkg_or_trigger
 439              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 440              << ":" << s
 441              << endl;
 442       if(OutStatusFd > 0)
 443          write(OutStatusFd, status.str().c_str(), status.str().size());
 444       if (_config->FindB("Debug::pkgDPkgProgressReporting",false) == true)
 445          std::clog << "send: '" << status.str() << "'" << endl;
 446       return;
 447    }
 448
 449    if(strncmp(action,"error",strlen("error")) == 0)
 450    {
 451       // urgs, sometime has ":" in its error string so that we
 452       // end up with the error message split between list[3]
 453       // and list[4], e.g. the message:
 454       // "failed in buffer_write(fd) (10, ret=-1): backend dpkg-deb ..."
 455       // concat them again
 456       if( list[4] != NULL )
 457          list[3][strlen(list[3])] = ':';
 458
 459       status << "pmerror:" << list[1]
 460              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 461              << ":" << list[3]
 462              << endl;
 463       if(OutStatusFd > 0)
 464          write(OutStatusFd, status.str().c_str(), status.str().size());
 465       if (_config->FindB("Debug::pkgDPkgProgressReporting",false) == true)
 466          std::clog << "send: '" << status.str() << "'" << endl;
 467       pkgFailures++;
 468       WriteApportReport(list[1], list[3]);
 469       return;
 470    }
 471    if(strncmp(action,"conffile",strlen("conffile")) == 0)
 472    {
 473       status << "pmconffile:" << list[1]
 474              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 475              << ":" << list[3]
 476              << endl;
 477       if(OutStatusFd > 0)
 478          write(OutStatusFd, status.str().c_str(), status.str().size());
 479       if (_config->FindB("Debug::pkgDPkgProgressReporting",false) == true)
 480          std::clog << "send: '" << status.str() << "'" << endl;
 481       return;
 482    }
 483
 484    vector<struct DpkgState> &states = PackageOps[pkg];
 485    const char *next_action = NULL;
 486    if(PackageOpsDone[pkg] < states.size())
 487       next_action = states[PackageOpsDone[pkg]].state;
 488    // check if the package moved to the next dpkg state
 489    if(next_action && (strcmp(action, next_action) == 0))
 490    {
 491       // only read the translation if there is actually a next
 492       // action
 493       const char *translation = _(states[PackageOpsDone[pkg]].str);
 494       char s[200];
 495       snprintf(s, sizeof(s), translation, pkg);
 496
 497       // we moved from one dpkg state to a new one, report that
 498       PackageOpsDone[pkg]++;
 499       PackagesDone++;
 500       // build the status str
 501       status << "pmstatus:" << pkg
 502              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 503              << ":" << s
 504              << endl;
 505       if(OutStatusFd > 0)
 506          write(OutStatusFd, status.str().c_str(), status.str().size());
 507       if (_config->FindB("Debug::pkgDPkgProgressReporting",false) == true)
 508          std::clog << "send: '" << status.str() << "'" << endl;
 509    }
 510    if (_config->FindB("Debug::pkgDPkgProgressReporting",false) == true)
 511       std::clog << "(parsed from dpkg) pkg: " << pkg
 512                 << " action: " << action << endl;
 513 }
 514
 515 // DPkgPM::DoDpkgStatusFd                                               /*{{{*/
 516 // ---------------------------------------------------------------------
 517 /*
 518  */
 519 void pkgDPkgPM::DoDpkgStatusFd(int statusfd, int OutStatusFd)
 520 {
 521    char *p, *q;
 522    int len;
 523
 524    len=read(statusfd, &dpkgbuf[dpkgbuf_pos], sizeof(dpkgbuf)-dpkgbuf_pos);
 525    dpkgbuf_pos += len;
 526    if(len <= 0)
 527       return;
 528
 529    // process line by line if we have a buffer
 530    p = q = dpkgbuf;
 531    while((q=(char*)memchr(p, '\n', dpkgbuf+dpkgbuf_pos-p)) != NULL)
 532    {
 533       *q = 0;
 534       ProcessDpkgStatusLine(OutStatusFd, p);
 535       p=q+1; // continue with next line
 536    }
 537
 538    // now move the unprocessed bits (after the final \n that is now a 0x0)
 539    // to the start and update dpkgbuf_pos
 540    p = (char*)memrchr(dpkgbuf, 0, dpkgbuf_pos);
 541    if(p == NULL)
 542       return;
 543
 544    // we are interessted in the first char *after* 0x0
 545    p++;
 546
 547    // move the unprocessed tail to the start and update pos
 548    memmove(dpkgbuf, p, p-dpkgbuf);
 549    dpkgbuf_pos = dpkgbuf+dpkgbuf_pos-p;
 550 }
 551                                                                         /*}}}*/
 552
 553 bool pkgDPkgPM::OpenLog()
 554 {
 555    string logdir = _config->FindDir("Dir::Log");
 556    if(not FileExists(logdir))
 557       return _error->Error(_("Directory '%s' missing"), logdir.c_str());
 558    string logfile_name = flCombine(logdir,
 559                                    _config->Find("Dir::Log::Terminal"));
 560    if (!logfile_name.empty())
 561    {
 562       term_out = fopen(logfile_name.c_str(),"a");
 563       chmod(logfile_name.c_str(), 0600);
 564       // output current time
 565       char outstr[200];
 566       time_t t = time(NULL);
 567       struct tm *tmp = localtime(&t);
 568       strftime(outstr, sizeof(outstr), "%F  %T", tmp);
 569       fprintf(term_out, "\nLog started: ");
 570       fprintf(term_out, "%s", outstr);
 571       fprintf(term_out, "\n");
 572    }
 573    return true;
 574 }
 575
 576 bool pkgDPkgPM::CloseLog()
 577 {
 578    if(term_out)
 579    {
 580       char outstr[200];
 581       time_t t = time(NULL);
 582       struct tm *tmp = localtime(&t);
 583       strftime(outstr, sizeof(outstr), "%F  %T", tmp);
 584       fprintf(term_out, "Log ended: ");
 585       fprintf(term_out, "%s", outstr);
 586       fprintf(term_out, "\n");
 587       fclose(term_out);
 588    }
 589    term_out = NULL;
 590    return true;
 591 }
 592
 593 /*{{{*/
 594 // This implements a racy version of pselect for those architectures
 595 // that don't have a working implementation.
 596 // FIXME: Probably can be removed on Lenny+1
 597 static int racy_pselect(int nfds, fd_set *readfds, fd_set *writefds,
 598    fd_set *exceptfds, const struct timespec *timeout,
 599    const sigset_t *sigmask)
 600 {
 601    sigset_t origmask;
 602    struct timeval tv;
 603    int retval;
 604
 605    tv.tv_sec = timeout->tv_sec;
 606    tv.tv_usec = timeout->tv_nsec/1000;
 607
 608    sigprocmask(SIG_SETMASK, sigmask, &origmask);
 609    retval = select(nfds, readfds, writefds, exceptfds, &tv);
 610    sigprocmask(SIG_SETMASK, &origmask, 0);
 611    return retval;
 612 }
 613 /*}}}*/
 614
 615 // DPkgPM::Go - Run the sequence                                        /*{{{*/
 616 // ---------------------------------------------------------------------
 617 /* This globs the operations and calls dpkg
 618  *
 619  * If it is called with "OutStatusFd" set to a valid file descriptor
 620  * apt will report the install progress over this fd. It maps the
 621  * dpkg states a package goes through to human readable (and i10n-able)
 622  * names and calculates a percentage for each step.
 623 */
 624 bool pkgDPkgPM::Go(int OutStatusFd)
 625 {
 626    fd_set rfds;
 627    struct timespec tv;
 628    sigset_t sigmask;
 629    sigset_t original_sigmask;
 630
 631    unsigned int MaxArgs = _config->FindI("Dpkg::MaxArgs",8*1024);
 632    unsigned int MaxArgBytes = _config->FindI("Dpkg::MaxArgBytes",32*1024);
 633    bool NoTriggers = _config->FindB("DPkg::NoTriggers",false);
 634
 635    if (RunScripts("DPkg::Pre-Invoke") == false)
 636       return false;
 637
 638    if (RunScriptsWithPkgs("DPkg::Pre-Install-Pkgs") == false)
 639       return false;
 640
 641    // map the dpkg states to the operations that are performed
 642    // (this is sorted in the same way as Item::Ops)
 643    static const struct DpkgState DpkgStatesOpMap[][7] = {
 644       // Install operation
 645       {
 646          {"half-installed", N_("Preparing %s")},
 647          {"unpacked", N_("Unpacking %s") },
 648          {NULL, NULL}
 649       },
 650       // Configure operation
 651       {
 652          {"unpacked",N_("Preparing to configure %s") },
 653          {"half-configured", N_("Configuring %s") },
 654          { "installed", N_("Installed %s")},
 655          {NULL, NULL}
 656       },
 657       // Remove operation
 658       {
 659          {"half-configured", N_("Preparing for removal of %s")},
 660          {"half-installed", N_("Removing %s")},
 661          {"config-files",  N_("Removed %s")},
 662          {NULL, NULL}
 663       },
 664       // Purge operation
 665       {
 666          {"config-files", N_("Preparing to completely remove %s")},
 667          {"not-installed", N_("Completely removed %s")},
 668          {NULL, NULL}
 669       },
 670    };
 671
 672    // init the PackageOps map, go over the list of packages that
 673    // that will be [installed|configured|removed|purged] and add
 674    // them to the PackageOps map (the dpkg states it goes through)
 675    // and the PackageOpsTranslations (human readable strings)
 676    for (vector<Item>::iterator I = List.begin(); I != List.end();I++)
 677    {
 678       string name = (*I).Pkg.Name();
 679       PackageOpsDone[name] = 0;
 680       for(int i=0; (DpkgStatesOpMap[(*I).Op][i]).state != NULL;  i++)
 681       {
 682          PackageOps[name].push_back(DpkgStatesOpMap[(*I).Op][i]);
 683          PackagesTotal++;
 684       }
 685    }
 686
 687    stdin_is_dev_null = false;
 688
 689    // create log
 690    OpenLog();
 691
 692    // this loop is runs once per operation
 693    for (vector<Item>::iterator I = List.begin(); I != List.end();)
 694    {
 695       vector<Item>::iterator J = I;
 696       for (; J != List.end() && J->Op == I->Op; J++)
 697          /* nothing */;
 698
 699       // Generate the argument list
 700       const char *Args[MaxArgs + 50];
 701
 702       // Now check if we are within the MaxArgs limit
 703       //
 704       // this code below is problematic, because it may happen that
 705       // the argument list is split in a way that A depends on B
 706       // and they are in the same "--configure A B" run
 707       // - with the split they may now be configured in different
 708       //   runs
 709       if (J - I > (signed)MaxArgs)
 710          J = I + MaxArgs;
 711
 712       unsigned int n = 0;
 713       unsigned long Size = 0;
 714       string Tmp = _config->Find("Dir::Bin::dpkg","dpkg");
 715       Args[n++] = Tmp.c_str();
 716       Size += strlen(Args[n-1]);
 717
 718       // Stick in any custom dpkg options
 719       Configuration::Item const *Opts = _config->Tree("DPkg::Options");
 720       if (Opts != 0)
 721       {
 722          Opts = Opts->Child;
 723          for (; Opts != 0; Opts = Opts->Next)
 724          {
 725             if (Opts->Value.empty() == true)
 726                continue;
 727             Args[n++] = Opts->Value.c_str();
 728             Size += Opts->Value.length();
 729          }
 730       }
 731
 732       char status_fd_buf[20];
 733       int fd[2];
 734       pipe(fd);
 735
 736       Args[n++] = "--status-fd";
 737       Size += strlen(Args[n-1]);
 738       snprintf(status_fd_buf,sizeof(status_fd_buf),"%i", fd[1]);
 739       Args[n++] = status_fd_buf;
 740       Size += strlen(Args[n-1]);
 741
 742       switch (I->Op)
 743       {
 744          case Item::Remove:
 745          Args[n++] = "--force-depends";
 746          Size += strlen(Args[n-1]);
 747          Args[n++] = "--force-remove-essential";
 748          Size += strlen(Args[n-1]);
 749          Args[n++] = "--remove";
 750          Size += strlen(Args[n-1]);
 751          break;
 752
 753          case Item::Purge:
 754          Args[n++] = "--force-depends";
 755          Size += strlen(Args[n-1]);
 756          Args[n++] = "--force-remove-essential";
 757          Size += strlen(Args[n-1]);
 758          Args[n++] = "--purge";
 759          Size += strlen(Args[n-1]);
 760          break;
 761
 762          case Item::Configure:
 763          Args[n++] = "--configure";
 764          if (NoTriggers)
 765             Args[n++] = "--no-triggers";
 766          Size += strlen(Args[n-1]);
 767          break;
 768
 769          case Item::Install:
 770          Args[n++] = "--unpack";
 771          Size += strlen(Args[n-1]);
 772          Args[n++] = "--auto-deconfigure";
 773          Size += strlen(Args[n-1]);
 774          break;
 775       }
 776
 777       // Write in the file or package names
 778       if (I->Op == Item::Install)
 779       {
 780          for (;I != J && Size < MaxArgBytes; I++)
 781          {
 782             if (I->File[0] != '/')
 783                return _error->Error("Internal Error, Pathname to install is not absolute '%s'",I->File.c_str());
 784             Args[n++] = I->File.c_str();
 785             Size += strlen(Args[n-1]);
 786          }
 787       }
 788       else
 789       {
 790          for (;I != J && Size < MaxArgBytes; I++)
 791          {
 792             Args[n++] = I->Pkg.Name();
 793             Size += strlen(Args[n-1]);
 794          }
 795       }
 796       Args[n] = 0;
 797       J = I;
 798
 799       if (_config->FindB("Debug::pkgDPkgPM",false) == true)
 800       {
 801          for (unsigned int k = 0; k != n; k++)
 802             clog << Args[k] << ' ';
 803          clog << endl;
 804          continue;
 805       }
 806
 807       cout << flush;
 808       clog << flush;
 809       cerr << flush;
 810
 811       /* Mask off sig int/quit. We do this because dpkg also does when
 812          it forks scripts. What happens is that when you hit ctrl-c it sends
 813          it to all processes in the group. Since dpkg ignores the signal
 814          it doesn't die but we do! So we must also ignore it */
 815       sighandler_t old_SIGQUIT = signal(SIGQUIT,SIG_IGN);
 816       sighandler_t old_SIGINT = signal(SIGINT,SIG_IGN);
 817
 818       // ignore SIGHUP as well (debian #463030)
 819       sighandler_t old_SIGHUP = signal(SIGHUP,SIG_IGN);
 820
 821       struct    termios tt;
 822       struct    winsize win;
 823       int       master;
 824       int       slave;
 825
 826       // FIXME: setup sensible signal handling (*ick*)
 827       tcgetattr(0, &tt);
 828       ioctl(0, TIOCGWINSZ, (char *)&win);
 829       if (openpty(&master, &slave, NULL, &tt, &win) < 0)
 830       {
 831          const char *s = _("Can not write log, openpty() "
 832                            "failed (/dev/pts not mounted?)\n");
 833          fprintf(stderr, "%s",s);
 834          fprintf(term_out, "%s",s);
 835          master = slave = -1;
 836       }  else {
 837          struct termios rtt;
 838          rtt = tt;
 839          cfmakeraw(&rtt);
 840          rtt.c_lflag &= ~ECHO;
 841          // block SIGTTOU during tcsetattr to prevent a hang if
 842          // the process is a member of the background process group
 843          // http://www.opengroup.org/onlinepubs/000095399/functions/tcsetattr.html
 844          sigemptyset(&sigmask);
 845          sigaddset(&sigmask, SIGTTOU);
 846          sigprocmask(SIG_BLOCK,&sigmask, &original_sigmask);
 847          tcsetattr(0, TCSAFLUSH, &rtt);
 848          sigprocmask(SIG_SETMASK, &original_sigmask, 0);
 849       }
 850
 851        // Fork dpkg
 852       pid_t Child;
 853       _config->Set("APT::Keep-Fds::",fd[1]);
 854       // send status information that we are about to fork dpkg
 855       if(OutStatusFd > 0) {
 856          ostringstream status;
 857          status << "pmstatus:dpkg-exec:"
 858                 << (PackagesDone/float(PackagesTotal)*100.0)
 859                 << ":" << _("Running dpkg")
 860                 << endl;
 861          write(OutStatusFd, status.str().c_str(), status.str().size());
 862       }
 863       Child = ExecFork();
 864
 865       // This is the child
 866       if (Child == 0)
 867       {
 868          if(slave >= 0 && master >= 0)
 869          {
 870             setsid();
 871             ioctl(slave, TIOCSCTTY, 0);
 872             close(master);
 873             dup2(slave, 0);
 874             dup2(slave, 1);
 875             dup2(slave, 2);
 876             close(slave);
 877          }
 878          close(fd[0]); // close the read end of the pipe
 879
 880          if (_config->FindDir("DPkg::Chroot-Directory","/") != "/")
 881          {
 882             std::cerr << "Chrooting into "
 883                       << _config->FindDir("DPkg::Chroot-Directory")
 884                       << std::endl;
 885             if (chroot(_config->FindDir("DPkg::Chroot-Directory","/").c_str()) != 0)
 886                _exit(100);
 887          }
 888
 889          if (chdir(_config->FindDir("DPkg::Run-Directory","/").c_str()) != 0)
 890             _exit(100);
 891
 892          if (_config->FindB("DPkg::FlushSTDIN",true) == true && isatty(STDIN_FILENO))
 893          {
 894             int Flags,dummy;
 895             if ((Flags = fcntl(STDIN_FILENO,F_GETFL,dummy)) < 0)
 896                _exit(100);
 897
 898             // Discard everything in stdin before forking dpkg
 899             if (fcntl(STDIN_FILENO,F_SETFL,Flags | O_NONBLOCK) < 0)
 900                _exit(100);
 901
 902             while (read(STDIN_FILENO,&dummy,1) == 1);
 903
 904             if (fcntl(STDIN_FILENO,F_SETFL,Flags & (~(long)O_NONBLOCK)) < 0)
 905                _exit(100);
 906          }
 907
 908          /* No Job Control Stop Env is a magic dpkg var that prevents it
 909             from using sigstop */
 910          putenv((char *)"DPKG_NO_TSTP=yes");
 911          execvp(Args[0],(char **)Args);
 912          cerr << "Could not exec dpkg!" << endl;
 913          _exit(100);
 914       }
 915
 916       // apply ionice
 917       if (_config->FindB("DPkg::UseIoNice", false) == true)
 918          ionice(Child);
 919
 920       // clear the Keep-Fd again
 921       _config->Clear("APT::Keep-Fds",fd[1]);
 922
 923       // Wait for dpkg
 924       int Status = 0;
 925
 926       // we read from dpkg here
 927       int _dpkgin = fd[0];
 928       close(fd[1]);                        // close the write end of the pipe
 929
 930       // the result of the waitpid call
 931       int res;
 932       if(slave > 0)
 933          close(slave);
 934
 935       // setups fds
 936       sigemptyset(&sigmask);
 937       sigprocmask(SIG_BLOCK,&sigmask,&original_sigmask);
 938
 939       int select_ret;
 940       while ((res=waitpid(Child,&Status, WNOHANG)) != Child) {
 941          if(res < 0) {
 942             // FIXME: move this to a function or something, looks ugly here
 943             // error handling, waitpid returned -1
 944             if (errno == EINTR)
 945                continue;
 946             RunScripts("DPkg::Post-Invoke");
 947
 948             // Restore sig int/quit
 949             signal(SIGQUIT,old_SIGQUIT);
 950             signal(SIGINT,old_SIGINT);
 951             signal(SIGHUP,old_SIGHUP);
 952             return _error->Errno("waitpid","Couldn't wait for subprocess");
 953          }
 954          // wait for input or output here
 955          FD_ZERO(&rfds);
 956          if (!stdin_is_dev_null)
 957             FD_SET(0, &rfds);
 958          FD_SET(_dpkgin, &rfds);
 959          if(master >= 0)
 960             FD_SET(master, &rfds);
 961          tv.tv_sec = 1;
 962          tv.tv_nsec = 0;
 963          select_ret = pselect(max(master, _dpkgin)+1, &rfds, NULL, NULL,
 964                               &tv, &original_sigmask);
 965          if (select_ret < 0 && (errno == EINVAL || errno == ENOSYS))
 966             select_ret = racy_pselect(max(master, _dpkgin)+1, &rfds, NULL,
 967                                       NULL, &tv, &original_sigmask);
 968          if (select_ret == 0)
 969             continue;
 970          else if (select_ret < 0 && errno == EINTR)
 971             continue;
 972          else if (select_ret < 0)
 973          {
 974             perror("select() returned error");
 975             continue;
 976          }
 977
 978          if(master >= 0 && FD_ISSET(master, &rfds))
 979             DoTerminalPty(master);
 980          if(master >= 0 && FD_ISSET(0, &rfds))
 981             DoStdin(master);
 982          if(FD_ISSET(_dpkgin, &rfds))
 983             DoDpkgStatusFd(_dpkgin, OutStatusFd);
 984       }
 985       close(_dpkgin);
 986
 987       // Restore sig int/quit
 988       signal(SIGQUIT,old_SIGQUIT);
 989       signal(SIGINT,old_SIGINT);
 990       signal(SIGHUP,old_SIGHUP);
 991
 992       if(master >= 0)
 993       {
 994          tcsetattr(0, TCSAFLUSH, &tt);
 995          close(master);
 996       }
 997
 998       // Check for an error code.
 999       if (WIFEXITED(Status) == 0 || WEXITSTATUS(Status) != 0)
1000       {
1001          // if it was set to "keep-dpkg-runing" then we won't return
1002          // here but keep the loop going and just report it as a error
1003          // for later
1004          bool stopOnError = _config->FindB("Dpkg::StopOnError",true);
1005
1006          if(stopOnError)
1007             RunScripts("DPkg::Post-Invoke");
1008
1009          if (WIFSIGNALED(Status) != 0 && WTERMSIG(Status) == SIGSEGV)
1010             _error->Error("Sub-process %s received a segmentation fault.",Args[0]);
1011          else if (WIFEXITED(Status) != 0)
1012             _error->Error("Sub-process %s returned an error code (%u)",Args[0],WEXITSTATUS(Status));
1013          else
1014             _error->Error("Sub-process %s exited unexpectedly",Args[0]);
1015
1016          if(stopOnError)
1017          {
1018             CloseLog();
1019             return false;
1020          }
1021       }
1022    }
1023    CloseLog();
1024
1025    if (RunScripts("DPkg::Post-Invoke") == false)
1026       return false;
1027
1028    Cache.writeStateFile(NULL);
1029    return true;
1030 }
1031                                                                         /*}}}*/
1032 // pkgDpkgPM::Reset - Dump the contents of the command list             /*{{{*/
1033 // ---------------------------------------------------------------------
1034 /* */
1035 void pkgDPkgPM::Reset()
1036 {
1037    List.erase(List.begin(),List.end());
1038 }
1039                                                                         /*}}}*/
1040 // pkgDpkgPM::WriteApportReport - write out error report pkg failure    /*{{{*/
1041 // ---------------------------------------------------------------------
1042 /* */
1043 void pkgDPkgPM::WriteApportReport(const char *pkgpath, const char *errormsg)
1044 {
1045    string pkgname, reportfile, srcpkgname, pkgver, arch;
1046    string::size_type pos;
1047    FILE *report;
1048
1049    if (_config->FindB("Dpkg::ApportFailureReport",true) == false)
1050    {
1051       std::clog << "configured to not write apport reports" << std::endl;
1052       return;
1053    }
1054
1055    // only report the first errors
1056    if(pkgFailures > _config->FindI("APT::Apport::MaxReports", 3))
1057    {
1058       std::clog << _("No apport report written because MaxReports is reached already") << std::endl;
1059       return;
1060    }
1061
1062    // check if its not a follow up error
1063    const char *needle = dgettext("dpkg", "dependency problems - leaving unconfigured");
1064    if(strstr(errormsg, needle) != NULL) {
1065       std::clog << _("No apport report written because the error message indicates its a followup error from a previous failure.") << std::endl;
1066       return;
1067    }
1068
1069    // do not report disk-full failures
1070    if(strstr(errormsg, strerror(ENOSPC)) != NULL) {
1071       std::clog << _("No apport report written because the error message indicates a disk full error") << std::endl;
1072       return;
1073    }
1074
1075    // do not report out-of-memory failures
1076    if(strstr(errormsg, strerror(ENOMEM)) != NULL) {
1077       std::clog << _("No apport report written because the error message indicates a out of memory error") << std::endl;
1078       return;
1079    }
1080
1081    // do not report dpkg I/O errors
1082    // XXX - this message is localized, but this only matches the English version.  This is better than nothing.
1083    if(strstr(errormsg, "short read in buffer_copy (")) {
1084       std::clog << _("No apport report written because the error message indicates a dpkg I/O error") << std::endl;
1085       return;
1086    }
1087
1088    // get the pkgname and reportfile
1089    pkgname = flNotDir(pkgpath);
1090    pos = pkgname.find('_');
1091    if(pos != string::npos)
1092       pkgname = pkgname.substr(0, pos);
1093
1094    // find the package versin and source package name
1095    pkgCache::PkgIterator Pkg = Cache.FindPkg(pkgname);
1096    if (Pkg.end() == true)
1097       return;
1098    pkgCache::VerIterator Ver = Cache.GetCandidateVer(Pkg);
1099    if (Ver.end() == true)
1100       return;
1101    pkgver = Ver.VerStr() == NULL ? "unknown" : Ver.VerStr();
1102    pkgRecords Recs(Cache);
1103    pkgRecords::Parser &Parse = Recs.Lookup(Ver.FileList());
1104    srcpkgname = Parse.SourcePkg();
1105    if(srcpkgname.empty())
1106       srcpkgname = pkgname;
1107
1108    // if the file exists already, we check:
1109    // - if it was reported already (touched by apport).
1110    //   If not, we do nothing, otherwise
1111    //    we overwrite it. This is the same behaviour as apport
1112    // - if we have a report with the same pkgversion already
1113    //   then we skip it
1114    reportfile = flCombine("/var/crash",pkgname+".0.crash");
1115    if(FileExists(reportfile))
1116    {
1117       struct stat buf;
1118       char strbuf[255];
1119
1120       // check atime/mtime
1121       stat(reportfile.c_str(), &buf);
1122       if(buf.st_mtime > buf.st_atime)
1123          return;
1124
1125       // check if the existing report is the same version
1126       report = fopen(reportfile.c_str(),"r");
1127       while(fgets(strbuf, sizeof(strbuf), report) != NULL)
1128       {
1129          if(strstr(strbuf,"Package:") == strbuf)
1130          {
1131             char pkgname[255], version[255];
1132             if(sscanf(strbuf, "Package: %s %s", pkgname, version) == 2)
1133                if(strcmp(pkgver.c_str(), version) == 0)
1134                {
1135                   fclose(report);
1136                   return;
1137                }
1138          }
1139       }
1140       fclose(report);
1141    }
1142
1143    // now write the report
1144    arch = _config->Find("APT::Architecture");
1145    report = fopen(reportfile.c_str(),"w");
1146    if(report == NULL)
1147       return;
1148    if(_config->FindB("DPkgPM::InitialReportOnly",false) == true)
1149       chmod(reportfile.c_str(), 0);
1150    else
1151       chmod(reportfile.c_str(), 0600);
1152    fprintf(report, "ProblemType: Package\n");
1153    fprintf(report, "Architecture: %s\n", arch.c_str());
1154    time_t now = time(NULL);
1155    fprintf(report, "Date: %s" , ctime(&now));
1156    fprintf(report, "Package: %s %s\n", pkgname.c_str(), pkgver.c_str());
1157    fprintf(report, "SourcePackage: %s\n", srcpkgname.c_str());
1158    fprintf(report, "ErrorMessage:\n %s\n", errormsg);
1159
1160    // ensure that the log is flushed
1161    if(term_out)
1162       fflush(term_out);
1163
1164    // attach terminal log it if we have it
1165    string logfile_name = _config->FindFile("Dir::Log::Terminal");
1166    if (!logfile_name.empty())
1167    {
1168       FILE *log = NULL;
1169       char buf[1024];
1170
1171       fprintf(report, "DpkgTerminalLog:\n");
1172       log = fopen(logfile_name.c_str(),"r");
1173       if(log != NULL)
1174       {
1175          while( fgets(buf, sizeof(buf), log) != NULL)
1176             fprintf(report, " %s", buf);
1177          fclose(log);
1178       }
1179    }
1180
1181    // log the ordering
1182    const char *ops_str[] = {"Install", "Configure","Remove","Purge"};
1183    fprintf(report, "AptOrdering:\n");
1184    for (vector<Item>::iterator I = List.begin(); I != List.end(); I++)
1185       fprintf(report, " %s: %s\n", (*I).Pkg.Name(), ops_str[(*I).Op]);
1186
1187    // attach dmesg log (to learn about segfaults)
1188    if (FileExists("/bin/dmesg"))
1189    {
1190       FILE *log = NULL;
1191       char buf[1024];
1192
1193       fprintf(report, "Dmesg:\n");
1194       log = popen("/bin/dmesg","r");
1195       if(log != NULL)
1196       {
1197          while( fgets(buf, sizeof(buf), log) != NULL)
1198             fprintf(report, " %s", buf);
1199          fclose(log);
1200       }
1201    }
1202    fclose(report);
1203
1204 }
1205                                                                         /*}}}*/