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    return true;
 141 }
 142                                                                         /*}}}*/
 143 // DPkgPM::Remove - Remove a package                                    /*{{{*/
 144 // ---------------------------------------------------------------------
 145 /* Add a remove operation to the sequence list */
 146 bool pkgDPkgPM::Remove(PkgIterator Pkg,bool Purge)
 147 {
 148    if (Pkg.end() == true)
 149       return false;
 150
 151    if (Purge == true)
 152       List.push_back(Item(Item::Purge,Pkg));
 153    else
 154       List.push_back(Item(Item::Remove,Pkg));
 155    return true;
 156 }
 157                                                                         /*}}}*/
 158 // DPkgPM::SendV2Pkgs - Send version 2 package info                     /*{{{*/
 159 // ---------------------------------------------------------------------
 160 /* This is part of the helper script communication interface, it sends
 161    very complete information down to the other end of the pipe.*/
 162 bool pkgDPkgPM::SendV2Pkgs(FILE *F)
 163 {
 164    fprintf(F,"VERSION 2\n");
 165
 166    /* Write out all of the configuration directives by walking the
 167       configuration tree */
 168    const Configuration::Item *Top = _config->Tree(0);
 169    for (; Top != 0;)
 170    {
 171       if (Top->Value.empty() == false)
 172       {
 173          fprintf(F,"%s=%s\n",
 174                  QuoteString(Top->FullTag(),"=\"\n").c_str(),
 175                  QuoteString(Top->Value,"\n").c_str());
 176       }
 177
 178       if (Top->Child != 0)
 179       {
 180          Top = Top->Child;
 181          continue;
 182       }
 183
 184       while (Top != 0 && Top->Next == 0)
 185          Top = Top->Parent;
 186       if (Top != 0)
 187          Top = Top->Next;
 188    }
 189    fprintf(F,"\n");
 190
 191    // Write out the package actions in order.
 192    for (vector<Item>::iterator I = List.begin(); I != List.end(); I++)
 193    {
 194       pkgDepCache::StateCache &S = Cache[I->Pkg];
 195
 196       fprintf(F,"%s ",I->Pkg.Name());
 197       // Current version
 198       if (I->Pkg->CurrentVer == 0)
 199          fprintf(F,"- ");
 200       else
 201          fprintf(F,"%s ",I->Pkg.CurrentVer().VerStr());
 202
 203       // Show the compare operator
 204       // Target version
 205       if (S.InstallVer != 0)
 206       {
 207          int Comp = 2;
 208          if (I->Pkg->CurrentVer != 0)
 209             Comp = S.InstVerIter(Cache).CompareVer(I->Pkg.CurrentVer());
 210          if (Comp < 0)
 211             fprintf(F,"> ");
 212          if (Comp == 0)
 213             fprintf(F,"= ");
 214          if (Comp > 0)
 215             fprintf(F,"< ");
 216          fprintf(F,"%s ",S.InstVerIter(Cache).VerStr());
 217       }
 218       else
 219          fprintf(F,"> - ");
 220
 221       // Show the filename/operation
 222       if (I->Op == Item::Install)
 223       {
 224          // No errors here..
 225          if (I->File[0] != '/')
 226             fprintf(F,"**ERROR**\n");
 227          else
 228             fprintf(F,"%s\n",I->File.c_str());
 229       }
 230       if (I->Op == Item::Configure)
 231          fprintf(F,"**CONFIGURE**\n");
 232       if (I->Op == Item::Remove ||
 233           I->Op == Item::Purge)
 234          fprintf(F,"**REMOVE**\n");
 235
 236       if (ferror(F) != 0)
 237          return false;
 238    }
 239    return true;
 240 }
 241                                                                         /*}}}*/
 242 // DPkgPM::RunScriptsWithPkgs - Run scripts with package names on stdin /*{{{*/
 243 // ---------------------------------------------------------------------
 244 /* This looks for a list of scripts to run from the configuration file
 245    each one is run and is fed on standard input a list of all .deb files
 246    that are due to be installed. */
 247 bool pkgDPkgPM::RunScriptsWithPkgs(const char *Cnf)
 248 {
 249    Configuration::Item const *Opts = _config->Tree(Cnf);
 250    if (Opts == 0 || Opts->Child == 0)
 251       return true;
 252    Opts = Opts->Child;
 253
 254    unsigned int Count = 1;
 255    for (; Opts != 0; Opts = Opts->Next, Count++)
 256    {
 257       if (Opts->Value.empty() == true)
 258          continue;
 259
 260       // Determine the protocol version
 261       string OptSec = Opts->Value;
 262       string::size_type Pos;
 263       if ((Pos = OptSec.find(' ')) == string::npos || Pos == 0)
 264          Pos = OptSec.length();
 265       OptSec = "DPkg::Tools::Options::" + string(Opts->Value.c_str(),Pos);
 266
 267       unsigned int Version = _config->FindI(OptSec+"::Version",1);
 268
 269       // Create the pipes
 270       int Pipes[2];
 271       if (pipe(Pipes) != 0)
 272          return _error->Errno("pipe","Failed to create IPC pipe to subprocess");
 273       SetCloseExec(Pipes[0],true);
 274       SetCloseExec(Pipes[1],true);
 275
 276       // Purified Fork for running the script
 277       pid_t Process = ExecFork();
 278       if (Process == 0)
 279       {
 280          // Setup the FDs
 281          dup2(Pipes[0],STDIN_FILENO);
 282          SetCloseExec(STDOUT_FILENO,false);
 283          SetCloseExec(STDIN_FILENO,false);
 284          SetCloseExec(STDERR_FILENO,false);
 285
 286          const char *Args[4];
 287          Args[0] = "/bin/sh";
 288          Args[1] = "-c";
 289          Args[2] = Opts->Value.c_str();
 290          Args[3] = 0;
 291          execv(Args[0],(char **)Args);
 292          _exit(100);
 293       }
 294       close(Pipes[0]);
 295       FILE *F = fdopen(Pipes[1],"w");
 296       if (F == 0)
 297          return _error->Errno("fdopen","Faild to open new FD");
 298
 299       // Feed it the filenames.
 300       bool Die = false;
 301       if (Version <= 1)
 302       {
 303          for (vector<Item>::iterator I = List.begin(); I != List.end(); I++)
 304          {
 305             // Only deal with packages to be installed from .deb
 306             if (I->Op != Item::Install)
 307                continue;
 308
 309             // No errors here..
 310             if (I->File[0] != '/')
 311                continue;
 312
 313             /* Feed the filename of each package that is pending install
 314                into the pipe. */
 315             fprintf(F,"%s\n",I->File.c_str());
 316             if (ferror(F) != 0)
 317             {
 318                Die = true;
 319                break;
 320             }
 321          }
 322       }
 323       else
 324          Die = !SendV2Pkgs(F);
 325
 326       fclose(F);
 327
 328       // Clean up the sub process
 329       if (ExecWait(Process,Opts->Value.c_str()) == false)
 330          return _error->Error("Failure running script %s",Opts->Value.c_str());
 331    }
 332
 333    return true;
 334 }
 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[5];
 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       status << "pmerror:" << list[1]
 452              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 453              << ":" << list[3]
 454              << endl;
 455       if(OutStatusFd > 0)
 456          write(OutStatusFd, status.str().c_str(), status.str().size());
 457       if (_config->FindB("Debug::pkgDPkgProgressReporting",false) == true)
 458          std::clog << "send: '" << status.str() << "'" << endl;
 459       return;
 460    }
 461    if(strncmp(action,"conffile",strlen("conffile")) == 0)
 462    {
 463       status << "pmconffile:" << list[1]
 464              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 465              << ":" << list[3]
 466              << endl;
 467       if(OutStatusFd > 0)
 468          write(OutStatusFd, status.str().c_str(), status.str().size());
 469       if (_config->FindB("Debug::pkgDPkgProgressReporting",false) == true)
 470          std::clog << "send: '" << status.str() << "'" << endl;
 471       return;
 472    }
 473
 474    vector<struct DpkgState> &states = PackageOps[pkg];
 475    const char *next_action = NULL;
 476    if(PackageOpsDone[pkg] < states.size())
 477       next_action = states[PackageOpsDone[pkg]].state;
 478    // check if the package moved to the next dpkg state
 479    if(next_action && (strcmp(action, next_action) == 0))
 480    {
 481       // only read the translation if there is actually a next
 482       // action
 483       const char *translation = _(states[PackageOpsDone[pkg]].str);
 484       char s[200];
 485       snprintf(s, sizeof(s), translation, pkg);
 486
 487       // we moved from one dpkg state to a new one, report that
 488       PackageOpsDone[pkg]++;
 489       PackagesDone++;
 490       // build the status str
 491       status << "pmstatus:" << pkg
 492              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 493              << ":" << s
 494              << endl;
 495       if(OutStatusFd > 0)
 496          write(OutStatusFd, status.str().c_str(), status.str().size());
 497       if (_config->FindB("Debug::pkgDPkgProgressReporting",false) == true)
 498          std::clog << "send: '" << status.str() << "'" << endl;
 499    }
 500    if (_config->FindB("Debug::pkgDPkgProgressReporting",false) == true)
 501       std::clog << "(parsed from dpkg) pkg: " << pkg
 502                 << " action: " << action << endl;
 503 }
 504
 505 // DPkgPM::DoDpkgStatusFd                                               /*{{{*/
 506 // ---------------------------------------------------------------------
 507 /*
 508  */
 509 void pkgDPkgPM::DoDpkgStatusFd(int statusfd, int OutStatusFd)
 510 {
 511    char *p, *q;
 512    int len;
 513
 514    len=read(statusfd, &dpkgbuf[dpkgbuf_pos], sizeof(dpkgbuf)-dpkgbuf_pos);
 515    dpkgbuf_pos += len;
 516    if(len <= 0)
 517       return;
 518
 519    // process line by line if we have a buffer
 520    p = q = dpkgbuf;
 521    while((q=(char*)memchr(p, '\n', dpkgbuf+dpkgbuf_pos-p)) != NULL)
 522    {
 523       *q = 0;
 524       ProcessDpkgStatusLine(OutStatusFd, p);
 525       p=q+1; // continue with next line
 526    }
 527
 528    // now move the unprocessed bits (after the final \n that is now a 0x0)
 529    // to the start and update dpkgbuf_pos
 530    p = (char*)memrchr(dpkgbuf, 0, dpkgbuf_pos);
 531    if(p == NULL)
 532       return;
 533
 534    // we are interessted in the first char *after* 0x0
 535    p++;
 536
 537    // move the unprocessed tail to the start and update pos
 538    memmove(dpkgbuf, p, p-dpkgbuf);
 539    dpkgbuf_pos = dpkgbuf+dpkgbuf_pos-p;
 540 }
 541                                                                         /*}}}*/
 542
 543 bool pkgDPkgPM::OpenLog()
 544 {
 545    string logdir = _config->FindDir("Dir::Log");
 546    if(not FileExists(logdir))
 547       return _error->Error(_("Directory '%s' missing"), logdir.c_str());
 548    string logfile_name = flCombine(logdir,
 549                                    _config->Find("Dir::Log::Terminal"));
 550    if (!logfile_name.empty())
 551    {
 552       term_out = fopen(logfile_name.c_str(),"a");
 553       chmod(logfile_name.c_str(), 0600);
 554       // output current time
 555       char outstr[200];
 556       time_t t = time(NULL);
 557       struct tm *tmp = localtime(&t);
 558       strftime(outstr, sizeof(outstr), "%F  %T", tmp);
 559       fprintf(term_out, "\nLog started: ");
 560       fprintf(term_out, "%s", outstr);
 561       fprintf(term_out, "\n");
 562    }
 563    return true;
 564 }
 565
 566 bool pkgDPkgPM::CloseLog()
 567 {
 568    if(term_out)
 569    {
 570       char outstr[200];
 571       time_t t = time(NULL);
 572       struct tm *tmp = localtime(&t);
 573       strftime(outstr, sizeof(outstr), "%F  %T", tmp);
 574       fprintf(term_out, "Log ended: ");
 575       fprintf(term_out, "%s", outstr);
 576       fprintf(term_out, "\n");
 577       fclose(term_out);
 578    }
 579    term_out = NULL;
 580    return true;
 581 }
 582
 583 /*{{{*/
 584 // This implements a racy version of pselect for those architectures
 585 // that don't have a working implementation.
 586 // FIXME: Probably can be removed on Lenny+1
 587 static int racy_pselect(int nfds, fd_set *readfds, fd_set *writefds,
 588    fd_set *exceptfds, const struct timespec *timeout,
 589    const sigset_t *sigmask)
 590 {
 591    sigset_t origmask;
 592    struct timeval tv;
 593    int retval;
 594
 595    tv.tv_sec = timeout->tv_sec;
 596    tv.tv_usec = timeout->tv_nsec/1000;
 597
 598    sigprocmask(SIG_SETMASK, sigmask, &origmask);
 599    retval = select(nfds, readfds, writefds, exceptfds, &tv);
 600    sigprocmask(SIG_SETMASK, &origmask, 0);
 601    return retval;
 602 }
 603 /*}}}*/
 604
 605 // DPkgPM::Go - Run the sequence                                        /*{{{*/
 606 // ---------------------------------------------------------------------
 607 /* This globs the operations and calls dpkg
 608  *
 609  * If it is called with "OutStatusFd" set to a valid file descriptor
 610  * apt will report the install progress over this fd. It maps the
 611  * dpkg states a package goes through to human readable (and i10n-able)
 612  * names and calculates a percentage for each step.
 613 */
 614 bool pkgDPkgPM::Go(int OutStatusFd)
 615 {
 616    fd_set rfds;
 617    struct timespec tv;
 618    sigset_t sigmask;
 619    sigset_t original_sigmask;
 620
 621    unsigned int MaxArgs = _config->FindI("Dpkg::MaxArgs",8*1024);
 622    unsigned int MaxArgBytes = _config->FindI("Dpkg::MaxArgBytes",32*1024);
 623    bool NoTriggers = _config->FindB("DPkg::NoTriggers",false);
 624
 625    if (RunScripts("DPkg::Pre-Invoke") == false)
 626       return false;
 627
 628    if (RunScriptsWithPkgs("DPkg::Pre-Install-Pkgs") == false)
 629       return false;
 630
 631    // map the dpkg states to the operations that are performed
 632    // (this is sorted in the same way as Item::Ops)
 633    static const struct DpkgState DpkgStatesOpMap[][7] = {
 634       // Install operation
 635       {
 636          {"half-installed", N_("Preparing %s")},
 637          {"unpacked", N_("Unpacking %s") },
 638          {NULL, NULL}
 639       },
 640       // Configure operation
 641       {
 642          {"unpacked",N_("Preparing to configure %s") },
 643          {"half-configured", N_("Configuring %s") },
 644          { "installed", N_("Installed %s")},
 645          {NULL, NULL}
 646       },
 647       // Remove operation
 648       {
 649          {"half-configured", N_("Preparing for removal of %s")},
 650          {"half-installed", N_("Removing %s")},
 651          {"config-files",  N_("Removed %s")},
 652          {NULL, NULL}
 653       },
 654       // Purge operation
 655       {
 656          {"config-files", N_("Preparing to completely remove %s")},
 657          {"not-installed", N_("Completely removed %s")},
 658          {NULL, NULL}
 659       },
 660    };
 661
 662    // init the PackageOps map, go over the list of packages that
 663    // that will be [installed|configured|removed|purged] and add
 664    // them to the PackageOps map (the dpkg states it goes through)
 665    // and the PackageOpsTranslations (human readable strings)
 666    for (vector<Item>::iterator I = List.begin(); I != List.end();I++)
 667    {
 668       string name = (*I).Pkg.Name();
 669       PackageOpsDone[name] = 0;
 670       for(int i=0; (DpkgStatesOpMap[(*I).Op][i]).state != NULL;  i++)
 671       {
 672          PackageOps[name].push_back(DpkgStatesOpMap[(*I).Op][i]);
 673          PackagesTotal++;
 674       }
 675    }
 676
 677    stdin_is_dev_null = false;
 678
 679    // create log
 680    OpenLog();
 681
 682    // this loop is runs once per operation
 683    for (vector<Item>::iterator I = List.begin(); I != List.end();)
 684    {
 685       vector<Item>::iterator J = I;
 686       for (; J != List.end() && J->Op == I->Op; J++)
 687          /* nothing */;
 688
 689       // Generate the argument list
 690       const char *Args[MaxArgs + 50];
 691
 692       // Now check if we are within the MaxArgs limit
 693       //
 694       // this code below is problematic, because it may happen that
 695       // the argument list is split in a way that A depends on B
 696       // and they are in the same "--configure A B" run
 697       // - with the split they may now be configured in different
 698       //   runs
 699       if (J - I > (signed)MaxArgs)
 700          J = I + MaxArgs;
 701
 702       unsigned int n = 0;
 703       unsigned long Size = 0;
 704       string Tmp = _config->Find("Dir::Bin::dpkg","dpkg");
 705       Args[n++] = Tmp.c_str();
 706       Size += strlen(Args[n-1]);
 707
 708       // Stick in any custom dpkg options
 709       Configuration::Item const *Opts = _config->Tree("DPkg::Options");
 710       if (Opts != 0)
 711       {
 712          Opts = Opts->Child;
 713          for (; Opts != 0; Opts = Opts->Next)
 714          {
 715             if (Opts->Value.empty() == true)
 716                continue;
 717             Args[n++] = Opts->Value.c_str();
 718             Size += Opts->Value.length();
 719          }
 720       }
 721
 722       char status_fd_buf[20];
 723       int fd[2];
 724       pipe(fd);
 725
 726       Args[n++] = "--status-fd";
 727       Size += strlen(Args[n-1]);
 728       snprintf(status_fd_buf,sizeof(status_fd_buf),"%i", fd[1]);
 729       Args[n++] = status_fd_buf;
 730       Size += strlen(Args[n-1]);
 731
 732       switch (I->Op)
 733       {
 734          case Item::Remove:
 735          Args[n++] = "--force-depends";
 736          Size += strlen(Args[n-1]);
 737          Args[n++] = "--force-remove-essential";
 738          Size += strlen(Args[n-1]);
 739          Args[n++] = "--remove";
 740          Size += strlen(Args[n-1]);
 741          break;
 742
 743          case Item::Purge:
 744          Args[n++] = "--force-depends";
 745          Size += strlen(Args[n-1]);
 746          Args[n++] = "--force-remove-essential";
 747          Size += strlen(Args[n-1]);
 748          Args[n++] = "--purge";
 749          Size += strlen(Args[n-1]);
 750          break;
 751
 752          case Item::Configure:
 753          Args[n++] = "--configure";
 754          if (NoTriggers)
 755             Args[n++] = "--no-triggers";
 756          Size += strlen(Args[n-1]);
 757          break;
 758
 759          case Item::Install:
 760          Args[n++] = "--unpack";
 761          Size += strlen(Args[n-1]);
 762          Args[n++] = "--auto-deconfigure";
 763          Size += strlen(Args[n-1]);
 764          break;
 765       }
 766
 767       // Write in the file or package names
 768       if (I->Op == Item::Install)
 769       {
 770          for (;I != J && Size < MaxArgBytes; I++)
 771          {
 772             if (I->File[0] != '/')
 773                return _error->Error("Internal Error, Pathname to install is not absolute '%s'",I->File.c_str());
 774             Args[n++] = I->File.c_str();
 775             Size += strlen(Args[n-1]);
 776          }
 777       }
 778       else
 779       {
 780          for (;I != J && Size < MaxArgBytes; I++)
 781          {
 782             Args[n++] = I->Pkg.Name();
 783             Size += strlen(Args[n-1]);
 784          }
 785       }
 786       Args[n] = 0;
 787       J = I;
 788
 789       if (_config->FindB("Debug::pkgDPkgPM",false) == true)
 790       {
 791          for (unsigned int k = 0; k != n; k++)
 792             clog << Args[k] << ' ';
 793          clog << endl;
 794          continue;
 795       }
 796
 797       cout << flush;
 798       clog << flush;
 799       cerr << flush;
 800
 801       /* Mask off sig int/quit. We do this because dpkg also does when
 802          it forks scripts. What happens is that when you hit ctrl-c it sends
 803          it to all processes in the group. Since dpkg ignores the signal
 804          it doesn't die but we do! So we must also ignore it */
 805       sighandler_t old_SIGQUIT = signal(SIGQUIT,SIG_IGN);
 806       sighandler_t old_SIGINT = signal(SIGINT,SIG_IGN);
 807
 808       // ignore SIGHUP as well (debian #463030)
 809       sighandler_t old_SIGHUP = signal(SIGHUP,SIG_IGN);
 810
 811       struct    termios tt;
 812       struct    winsize win;
 813       int       master = -1;
 814       int       slave = -1;
 815
 816       // if tcgetattr does not return zero there was a error
 817       // and we do not do any pty magic
 818       if (tcgetattr(0, &tt) == 0)
 819       {
 820          ioctl(0, TIOCGWINSZ, (char *)&win);
 821          if (openpty(&master, &slave, NULL, &tt, &win) < 0)
 822          {
 823             const char *s = _("Can not write log, openpty() "
 824                               "failed (/dev/pts not mounted?)\n");
 825             fprintf(stderr, "%s",s);
 826             fprintf(term_out, "%s",s);
 827             master = slave = -1;
 828          }  else {
 829             struct termios rtt;
 830             rtt = tt;
 831             cfmakeraw(&rtt);
 832             rtt.c_lflag &= ~ECHO;
 833             // block SIGTTOU during tcsetattr to prevent a hang if
 834             // the process is a member of the background process group
 835             // http://www.opengroup.org/onlinepubs/000095399/functions/tcsetattr.html
 836             sigemptyset(&sigmask);
 837             sigaddset(&sigmask, SIGTTOU);
 838             sigprocmask(SIG_BLOCK,&sigmask, &original_sigmask);
 839             tcsetattr(0, TCSAFLUSH, &rtt);
 840             sigprocmask(SIG_SETMASK, &original_sigmask, 0);
 841          }
 842       }
 843
 844        // Fork dpkg
 845       pid_t Child;
 846       _config->Set("APT::Keep-Fds::",fd[1]);
 847       // send status information that we are about to fork dpkg
 848       if(OutStatusFd > 0) {
 849          ostringstream status;
 850          status << "pmstatus:dpkg-exec:"
 851                 << (PackagesDone/float(PackagesTotal)*100.0)
 852                 << ":" << _("Running dpkg")
 853                 << endl;
 854          write(OutStatusFd, status.str().c_str(), status.str().size());
 855       }
 856       Child = ExecFork();
 857
 858       // This is the child
 859       if (Child == 0)
 860       {
 861          if(slave >= 0 && master >= 0)
 862          {
 863             setsid();
 864             ioctl(slave, TIOCSCTTY, 0);
 865             close(master);
 866             dup2(slave, 0);
 867             dup2(slave, 1);
 868             dup2(slave, 2);
 869             close(slave);
 870          }
 871          close(fd[0]); // close the read end of the pipe
 872
 873          if (_config->FindDir("DPkg::Chroot-Directory","/") != "/")
 874          {
 875             std::cerr << "Chrooting into "
 876                       << _config->FindDir("DPkg::Chroot-Directory")
 877                       << std::endl;
 878             if (chroot(_config->FindDir("DPkg::Chroot-Directory","/").c_str()) != 0)
 879                _exit(100);
 880          }
 881
 882          if (chdir(_config->FindDir("DPkg::Run-Directory","/").c_str()) != 0)
 883             _exit(100);
 884
 885          if (_config->FindB("DPkg::FlushSTDIN",true) == true && isatty(STDIN_FILENO))
 886          {
 887             int Flags,dummy;
 888             if ((Flags = fcntl(STDIN_FILENO,F_GETFL,dummy)) < 0)
 889                _exit(100);
 890
 891             // Discard everything in stdin before forking dpkg
 892             if (fcntl(STDIN_FILENO,F_SETFL,Flags | O_NONBLOCK) < 0)
 893                _exit(100);
 894
 895             while (read(STDIN_FILENO,&dummy,1) == 1);
 896
 897             if (fcntl(STDIN_FILENO,F_SETFL,Flags & (~(long)O_NONBLOCK)) < 0)
 898                _exit(100);
 899          }
 900
 901          /* No Job Control Stop Env is a magic dpkg var that prevents it
 902             from using sigstop */
 903          putenv((char *)"DPKG_NO_TSTP=yes");
 904          execvp(Args[0],(char **)Args);
 905          cerr << "Could not exec dpkg!" << endl;
 906          _exit(100);
 907       }
 908
 909       // apply ionice
 910       if (_config->FindB("DPkg::UseIoNice", false) == true)
 911          ionice(Child);
 912
 913       // clear the Keep-Fd again
 914       _config->Clear("APT::Keep-Fds",fd[1]);
 915
 916       // Wait for dpkg
 917       int Status = 0;
 918
 919       // we read from dpkg here
 920       int _dpkgin = fd[0];
 921       close(fd[1]);                        // close the write end of the pipe
 922
 923       // the result of the waitpid call
 924       int res;
 925       if(slave > 0)
 926          close(slave);
 927
 928       // setups fds
 929       sigemptyset(&sigmask);
 930       sigprocmask(SIG_BLOCK,&sigmask,&original_sigmask);
 931
 932       int select_ret;
 933       while ((res=waitpid(Child,&Status, WNOHANG)) != Child) {
 934          if(res < 0) {
 935             // FIXME: move this to a function or something, looks ugly here
 936             // error handling, waitpid returned -1
 937             if (errno == EINTR)
 938                continue;
 939             RunScripts("DPkg::Post-Invoke");
 940
 941             // Restore sig int/quit
 942             signal(SIGQUIT,old_SIGQUIT);
 943             signal(SIGINT,old_SIGINT);
 944             signal(SIGHUP,old_SIGHUP);
 945             return _error->Errno("waitpid","Couldn't wait for subprocess");
 946          }
 947
 948          // wait for input or output here
 949          FD_ZERO(&rfds);
 950          if (!stdin_is_dev_null)
 951             FD_SET(0, &rfds);
 952          FD_SET(_dpkgin, &rfds);
 953          if(master >= 0)
 954             FD_SET(master, &rfds);
 955          tv.tv_sec = 1;
 956          tv.tv_nsec = 0;
 957          select_ret = pselect(max(master, _dpkgin)+1, &rfds, NULL, NULL,
 958                               &tv, &original_sigmask);
 959          if (select_ret < 0 && (errno == EINVAL || errno == ENOSYS))
 960             select_ret = racy_pselect(max(master, _dpkgin)+1, &rfds, NULL,
 961                                       NULL, &tv, &original_sigmask);
 962          if (select_ret == 0)
 963             continue;
 964          else if (select_ret < 0 && errno == EINTR)
 965             continue;
 966          else if (select_ret < 0)
 967          {
 968             perror("select() returned error");
 969             continue;
 970          }
 971
 972          if(master >= 0 && FD_ISSET(master, &rfds))
 973             DoTerminalPty(master);
 974          if(master >= 0 && FD_ISSET(0, &rfds))
 975             DoStdin(master);
 976          if(FD_ISSET(_dpkgin, &rfds))
 977             DoDpkgStatusFd(_dpkgin, OutStatusFd);
 978       }
 979       close(_dpkgin);
 980
 981       // Restore sig int/quit
 982       signal(SIGQUIT,old_SIGQUIT);
 983       signal(SIGINT,old_SIGINT);
 984       signal(SIGHUP,old_SIGHUP);
 985
 986       if(master >= 0)
 987       {
 988          tcsetattr(0, TCSAFLUSH, &tt);
 989          close(master);
 990       }
 991
 992       // Check for an error code.
 993       if (WIFEXITED(Status) == 0 || WEXITSTATUS(Status) != 0)
 994       {
 995          // if it was set to "keep-dpkg-runing" then we won't return
 996          // here but keep the loop going and just report it as a error
 997          // for later
 998          bool stopOnError = _config->FindB("Dpkg::StopOnError",true);
 999
1000          if(stopOnError)
1001             RunScripts("DPkg::Post-Invoke");
1002
1003          if (WIFSIGNALED(Status) != 0 && WTERMSIG(Status) == SIGSEGV)
1004             _error->Error("Sub-process %s received a segmentation fault.",Args[0]);
1005          else if (WIFEXITED(Status) != 0)
1006             _error->Error("Sub-process %s returned an error code (%u)",Args[0],WEXITSTATUS(Status));
1007          else
1008             _error->Error("Sub-process %s exited unexpectedly",Args[0]);
1009
1010          if(stopOnError)
1011          {
1012             CloseLog();
1013             return false;
1014          }
1015       }
1016    }
1017    CloseLog();
1018
1019    if (RunScripts("DPkg::Post-Invoke") == false)
1020       return false;
1021
1022    Cache.writeStateFile(NULL);
1023    return true;
1024 }
1025                                                                         /*}}}*/
1026 // pkgDpkgPM::Reset - Dump the contents of the command list             /*{{{*/
1027 // ---------------------------------------------------------------------
1028 /* */
1029 void pkgDPkgPM::Reset()
1030 {
1031    List.erase(List.begin(),List.end());
1032 }
1033                                                                         /*}}}*/