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("disappear", N_("Noting disappearance of %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), history_out(NULL), PackagesDone(0), PackagesTotal(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    // If the filename string begins with DPkg::Chroot-Directory, return the
 129    // substr that is within the chroot so dpkg can access it.
 130    string const chrootdir = _config->FindDir("DPkg::Chroot-Directory","/");
 131    if (chrootdir != "/" && File.find(chrootdir) == 0)
 132    {
 133       size_t len = chrootdir.length();
 134       if (chrootdir.at(len - 1) == '/')
 135         len--;
 136       List.push_back(Item(Item::Install,Pkg,File.substr(len)));
 137    }
 138    else
 139       List.push_back(Item(Item::Install,Pkg,File));
 140
 141    return true;
 142 }
 143                                                                         /*}}}*/
 144 // DPkgPM::Configure - Configure a package                              /*{{{*/
 145 // ---------------------------------------------------------------------
 146 /* Add a configure operation to the sequence list */
 147 bool pkgDPkgPM::Configure(PkgIterator Pkg)
 148 {
 149    if (Pkg.end() == true)
 150       return false;
 151
 152    List.push_back(Item(Item::Configure, Pkg));
 153
 154    // Use triggers for config calls if we configure "smart"
 155    // as otherwise Pre-Depends will not be satisfied, see #526774
 156    if (_config->FindB("DPkg::TriggersPending", false) == true)
 157       List.push_back(Item(Item::TriggersPending, PkgIterator()));
 158
 159    return true;
 160 }
 161                                                                         /*}}}*/
 162 // DPkgPM::Remove - Remove a package                                    /*{{{*/
 163 // ---------------------------------------------------------------------
 164 /* Add a remove operation to the sequence list */
 165 bool pkgDPkgPM::Remove(PkgIterator Pkg,bool Purge)
 166 {
 167    if (Pkg.end() == true)
 168       return false;
 169
 170    if (Purge == true)
 171       List.push_back(Item(Item::Purge,Pkg));
 172    else
 173       List.push_back(Item(Item::Remove,Pkg));
 174    return true;
 175 }
 176                                                                         /*}}}*/
 177 // DPkgPM::SendV2Pkgs - Send version 2 package info                     /*{{{*/
 178 // ---------------------------------------------------------------------
 179 /* This is part of the helper script communication interface, it sends
 180    very complete information down to the other end of the pipe.*/
 181 bool pkgDPkgPM::SendV2Pkgs(FILE *F)
 182 {
 183    fprintf(F,"VERSION 2\n");
 184
 185    /* Write out all of the configuration directives by walking the
 186       configuration tree */
 187    const Configuration::Item *Top = _config->Tree(0);
 188    for (; Top != 0;)
 189    {
 190       if (Top->Value.empty() == false)
 191       {
 192          fprintf(F,"%s=%s\n",
 193                  QuoteString(Top->FullTag(),"=\"\n").c_str(),
 194                  QuoteString(Top->Value,"\n").c_str());
 195       }
 196
 197       if (Top->Child != 0)
 198       {
 199          Top = Top->Child;
 200          continue;
 201       }
 202
 203       while (Top != 0 && Top->Next == 0)
 204          Top = Top->Parent;
 205       if (Top != 0)
 206          Top = Top->Next;
 207    }
 208    fprintf(F,"\n");
 209
 210    // Write out the package actions in order.
 211    for (vector<Item>::iterator I = List.begin(); I != List.end(); I++)
 212    {
 213       if(I->Pkg.end() == true)
 214          continue;
 215
 216       pkgDepCache::StateCache &S = Cache[I->Pkg];
 217
 218       fprintf(F,"%s ",I->Pkg.Name());
 219       // Current version
 220       if (I->Pkg->CurrentVer == 0)
 221          fprintf(F,"- ");
 222       else
 223          fprintf(F,"%s ",I->Pkg.CurrentVer().VerStr());
 224
 225       // Show the compare operator
 226       // Target version
 227       if (S.InstallVer != 0)
 228       {
 229          int Comp = 2;
 230          if (I->Pkg->CurrentVer != 0)
 231             Comp = S.InstVerIter(Cache).CompareVer(I->Pkg.CurrentVer());
 232          if (Comp < 0)
 233             fprintf(F,"> ");
 234          if (Comp == 0)
 235             fprintf(F,"= ");
 236          if (Comp > 0)
 237             fprintf(F,"< ");
 238          fprintf(F,"%s ",S.InstVerIter(Cache).VerStr());
 239       }
 240       else
 241          fprintf(F,"> - ");
 242
 243       // Show the filename/operation
 244       if (I->Op == Item::Install)
 245       {
 246          // No errors here..
 247          if (I->File[0] != '/')
 248             fprintf(F,"**ERROR**\n");
 249          else
 250             fprintf(F,"%s\n",I->File.c_str());
 251       }
 252       if (I->Op == Item::Configure)
 253          fprintf(F,"**CONFIGURE**\n");
 254       if (I->Op == Item::Remove ||
 255           I->Op == Item::Purge)
 256          fprintf(F,"**REMOVE**\n");
 257
 258       if (ferror(F) != 0)
 259          return false;
 260    }
 261    return true;
 262 }
 263                                                                         /*}}}*/
 264 // DPkgPM::RunScriptsWithPkgs - Run scripts with package names on stdin /*{{{*/
 265 // ---------------------------------------------------------------------
 266 /* This looks for a list of scripts to run from the configuration file
 267    each one is run and is fed on standard input a list of all .deb files
 268    that are due to be installed. */
 269 bool pkgDPkgPM::RunScriptsWithPkgs(const char *Cnf)
 270 {
 271    Configuration::Item const *Opts = _config->Tree(Cnf);
 272    if (Opts == 0 || Opts->Child == 0)
 273       return true;
 274    Opts = Opts->Child;
 275
 276    unsigned int Count = 1;
 277    for (; Opts != 0; Opts = Opts->Next, Count++)
 278    {
 279       if (Opts->Value.empty() == true)
 280          continue;
 281
 282       // Determine the protocol version
 283       string OptSec = Opts->Value;
 284       string::size_type Pos;
 285       if ((Pos = OptSec.find(' ')) == string::npos || Pos == 0)
 286          Pos = OptSec.length();
 287       OptSec = "DPkg::Tools::Options::" + string(Opts->Value.c_str(),Pos);
 288
 289       unsigned int Version = _config->FindI(OptSec+"::Version",1);
 290
 291       // Create the pipes
 292       int Pipes[2];
 293       if (pipe(Pipes) != 0)
 294          return _error->Errno("pipe","Failed to create IPC pipe to subprocess");
 295       SetCloseExec(Pipes[0],true);
 296       SetCloseExec(Pipes[1],true);
 297
 298       // Purified Fork for running the script
 299       pid_t Process = ExecFork();
 300       if (Process == 0)
 301       {
 302          // Setup the FDs
 303          dup2(Pipes[0],STDIN_FILENO);
 304          SetCloseExec(STDOUT_FILENO,false);
 305          SetCloseExec(STDIN_FILENO,false);
 306          SetCloseExec(STDERR_FILENO,false);
 307
 308          const char *Args[4];
 309          Args[0] = "/bin/sh";
 310          Args[1] = "-c";
 311          Args[2] = Opts->Value.c_str();
 312          Args[3] = 0;
 313          execv(Args[0],(char **)Args);
 314          _exit(100);
 315       }
 316       close(Pipes[0]);
 317       FILE *F = fdopen(Pipes[1],"w");
 318       if (F == 0)
 319          return _error->Errno("fdopen","Faild to open new FD");
 320
 321       // Feed it the filenames.
 322       bool Die = false;
 323       if (Version <= 1)
 324       {
 325          for (vector<Item>::iterator I = List.begin(); I != List.end(); I++)
 326          {
 327             // Only deal with packages to be installed from .deb
 328             if (I->Op != Item::Install)
 329                continue;
 330
 331             // No errors here..
 332             if (I->File[0] != '/')
 333                continue;
 334
 335             /* Feed the filename of each package that is pending install
 336                into the pipe. */
 337             fprintf(F,"%s\n",I->File.c_str());
 338             if (ferror(F) != 0)
 339             {
 340                Die = true;
 341                break;
 342             }
 343          }
 344       }
 345       else
 346          Die = !SendV2Pkgs(F);
 347
 348       fclose(F);
 349
 350       // Clean up the sub process
 351       if (ExecWait(Process,Opts->Value.c_str()) == false)
 352          return _error->Error("Failure running script %s",Opts->Value.c_str());
 353    }
 354
 355    return true;
 356 }
 357
 358                                                                         /*}}}*/
 359 // DPkgPM::DoStdin - Read stdin and pass to slave pty                   /*{{{*/
 360 // ---------------------------------------------------------------------
 361 /*
 362 */
 363 void pkgDPkgPM::DoStdin(int master)
 364 {
 365    unsigned char input_buf[256] = {0,};
 366    ssize_t len = read(0, input_buf, sizeof(input_buf));
 367    if (len)
 368       write(master, input_buf, len);
 369    else
 370       stdin_is_dev_null = true;
 371 }
 372                                                                         /*}}}*/
 373 // DPkgPM::DoTerminalPty - Read the terminal pty and write log          /*{{{*/
 374 // ---------------------------------------------------------------------
 375 /*
 376  * read the terminal pty and write log
 377  */
 378 void pkgDPkgPM::DoTerminalPty(int master)
 379 {
 380    unsigned char term_buf[1024] = {0,0, };
 381
 382    ssize_t len=read(master, term_buf, sizeof(term_buf));
 383    if(len == -1 && errno == EIO)
 384    {
 385       // this happens when the child is about to exit, we
 386       // give it time to actually exit, otherwise we run
 387       // into a race
 388       usleep(500000);
 389       return;
 390    }
 391    if(len <= 0)
 392       return;
 393    write(1, term_buf, len);
 394    if(term_out)
 395       fwrite(term_buf, len, sizeof(char), term_out);
 396 }
 397                                                                         /*}}}*/
 398 // DPkgPM::ProcessDpkgStatusBuf                                         /*{{{*/
 399 // ---------------------------------------------------------------------
 400 /*
 401  */
 402 void pkgDPkgPM::ProcessDpkgStatusLine(int OutStatusFd, char *line)
 403 {
 404    bool const Debug = _config->FindB("Debug::pkgDPkgProgressReporting",false);
 405    // the status we output
 406    ostringstream status;
 407
 408    if (Debug == true)
 409       std::clog << "got from dpkg '" << line << "'" << std::endl;
 410
 411
 412    /* dpkg sends strings like this:
 413       'status:   <pkg>:  <pkg  qstate>'
 414       errors look like this:
 415       '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
 416       and conffile-prompt like this
 417       'status: conffile-prompt: conffile : 'current-conffile' 'new-conffile' useredited distedited
 418
 419       Newer versions of dpkg sent also:
 420       'processing: install: pkg'
 421       'processing: configure: pkg'
 422       'processing: remove: pkg'
 423       'processing: purge: pkg'
 424       'processing: disappear: pkg'
 425       'processing: trigproc: trigger'
 426
 427    */
 428    char* list[5];
 429    //        dpkg sends multiline error messages sometimes (see
 430    //        #374195 for a example. we should support this by
 431    //        either patching dpkg to not send multiline over the
 432    //        statusfd or by rewriting the code here to deal with
 433    //        it. for now we just ignore it and not crash
 434    TokSplitString(':', line, list, sizeof(list)/sizeof(list[0]));
 435    if( list[0] == NULL || list[1] == NULL || list[2] == NULL)
 436    {
 437       if (Debug == true)
 438          std::clog << "ignoring line: not enough ':'" << std::endl;
 439       return;
 440    }
 441    const char* const pkg = list[1];
 442    const char* action = _strstrip(list[2]);
 443
 444    // 'processing' from dpkg looks like
 445    // 'processing: action: pkg'
 446    if(strncmp(list[0], "processing", strlen("processing")) == 0)
 447    {
 448       char s[200];
 449       const char* const pkg_or_trigger = _strstrip(list[2]);
 450       action = _strstrip( list[1]);
 451       const std::pair<const char *, const char *> * const iter =
 452         std::find_if(PackageProcessingOpsBegin,
 453                      PackageProcessingOpsEnd,
 454                      MatchProcessingOp(action));
 455       if(iter == PackageProcessingOpsEnd)
 456       {
 457          if (Debug == true)
 458             std::clog << "ignoring unknown action: " << action << std::endl;
 459          return;
 460       }
 461       snprintf(s, sizeof(s), _(iter->second), pkg_or_trigger);
 462
 463       status << "pmstatus:" << pkg_or_trigger
 464              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 465              << ":" << s
 466              << endl;
 467       if(OutStatusFd > 0)
 468          write(OutStatusFd, status.str().c_str(), status.str().size());
 469       if (Debug == true)
 470          std::clog << "send: '" << status.str() << "'" << endl;
 471
 472       if (strncmp(action, "disappear", strlen("disappear")) == 0)
 473          handleDisappearAction(pkg_or_trigger);
 474       return;
 475    }
 476
 477    if(strncmp(action,"error",strlen("error")) == 0)
 478    {
 479       status << "pmerror:" << list[1]
 480              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 481              << ":" << list[3]
 482              << endl;
 483       if(OutStatusFd > 0)
 484          write(OutStatusFd, status.str().c_str(), status.str().size());
 485       if (Debug == true)
 486          std::clog << "send: '" << status.str() << "'" << endl;
 487       return;
 488    }
 489    else if(strncmp(action,"conffile",strlen("conffile")) == 0)
 490    {
 491       status << "pmconffile:" << list[1]
 492              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 493              << ":" << list[3]
 494              << endl;
 495       if(OutStatusFd > 0)
 496          write(OutStatusFd, status.str().c_str(), status.str().size());
 497       if (Debug == true)
 498          std::clog << "send: '" << status.str() << "'" << endl;
 499       return;
 500    }
 501
 502    vector<struct DpkgState> const &states = PackageOps[pkg];
 503    const char *next_action = NULL;
 504    if(PackageOpsDone[pkg] < states.size())
 505       next_action = states[PackageOpsDone[pkg]].state;
 506    // check if the package moved to the next dpkg state
 507    if(next_action && (strcmp(action, next_action) == 0))
 508    {
 509       // only read the translation if there is actually a next
 510       // action
 511       const char *translation = _(states[PackageOpsDone[pkg]].str);
 512       char s[200];
 513       snprintf(s, sizeof(s), translation, pkg);
 514
 515       // we moved from one dpkg state to a new one, report that
 516       PackageOpsDone[pkg]++;
 517       PackagesDone++;
 518       // build the status str
 519       status << "pmstatus:" << pkg
 520              << ":"  << (PackagesDone/float(PackagesTotal)*100.0)
 521              << ":" << s
 522              << endl;
 523       if(OutStatusFd > 0)
 524          write(OutStatusFd, status.str().c_str(), status.str().size());
 525       if (Debug == true)
 526          std::clog << "send: '" << status.str() << "'" << endl;
 527    }
 528    if (Debug == true)
 529       std::clog << "(parsed from dpkg) pkg: " << pkg
 530                 << " action: " << action << endl;
 531 }
 532                                                                         /*}}}*/
 533 // DPkgPM::handleDisappearAction                                        /*{{{*/
 534 void pkgDPkgPM::handleDisappearAction(string const &pkgname)
 535 {
 536    // record the package name for display and stuff later
 537    disappearedPkgs.insert(pkgname);
 538
 539    pkgCache::PkgIterator Pkg = Cache.FindPkg(pkgname);
 540    if (unlikely(Pkg.end() == true))
 541       return;
 542    // the disappeared package was auto-installed - nothing to do
 543    if ((Cache[Pkg].Flags & pkgCache::Flag::Auto) == pkgCache::Flag::Auto)
 544       return;
 545    pkgCache::VerIterator PkgVer = Pkg.CurrentVer();
 546    if (unlikely(PkgVer.end() == true))
 547       return;
 548    /* search in the list of dependencies for (Pre)Depends,
 549       check if this dependency has a Replaces on our package
 550       and if so transfer the manual installed flag to it */
 551    for (pkgCache::DepIterator Dep = PkgVer.DependsList(); Dep.end() != true; ++Dep)
 552    {
 553       if (Dep->Type != pkgCache::Dep::Depends &&
 554           Dep->Type != pkgCache::Dep::PreDepends)
 555          continue;
 556       pkgCache::PkgIterator Tar = Dep.TargetPkg();
 557       if (unlikely(Tar.end() == true))
 558          continue;
 559       // the package is already marked as manual
 560       if ((Cache[Tar].Flags & pkgCache::Flag::Auto) != pkgCache::Flag::Auto)
 561          continue;
 562       pkgCache::VerIterator TarVer = Tar.CurrentVer();
 563       for (pkgCache::DepIterator Rep = TarVer.DependsList(); Rep.end() != true; ++Rep)
 564       {
 565          if (Rep->Type != pkgCache::Dep::Replaces)
 566             continue;
 567          if (Pkg != Rep.TargetPkg())
 568             continue;
 569          // okay, they are strongly connected - transfer manual-bit
 570          if (Debug == true)
 571             std::clog << "transfer manual-bit from disappeared »" << pkgname << "« to »" << Tar.FullName() << "«" << std::endl;
 572          Cache[Tar].Flags &= ~Flag::Auto;
 573          break;
 574       }
 575    }
 576 }
 577                                                                         /*}}}*/
 578 // DPkgPM::DoDpkgStatusFd                                               /*{{{*/
 579 // ---------------------------------------------------------------------
 580 /*
 581  */
 582 void pkgDPkgPM::DoDpkgStatusFd(int statusfd, int OutStatusFd)
 583 {
 584    char *p, *q;
 585    int len;
 586
 587    len=read(statusfd, &dpkgbuf[dpkgbuf_pos], sizeof(dpkgbuf)-dpkgbuf_pos);
 588    dpkgbuf_pos += len;
 589    if(len <= 0)
 590       return;
 591
 592    // process line by line if we have a buffer
 593    p = q = dpkgbuf;
 594    while((q=(char*)memchr(p, '\n', dpkgbuf+dpkgbuf_pos-p)) != NULL)
 595    {
 596       *q = 0;
 597       ProcessDpkgStatusLine(OutStatusFd, p);
 598       p=q+1; // continue with next line
 599    }
 600
 601    // now move the unprocessed bits (after the final \n that is now a 0x0)
 602    // to the start and update dpkgbuf_pos
 603    p = (char*)memrchr(dpkgbuf, 0, dpkgbuf_pos);
 604    if(p == NULL)
 605       return;
 606
 607    // we are interessted in the first char *after* 0x0
 608    p++;
 609
 610    // move the unprocessed tail to the start and update pos
 611    memmove(dpkgbuf, p, p-dpkgbuf);
 612    dpkgbuf_pos = dpkgbuf+dpkgbuf_pos-p;
 613 }
 614                                                                         /*}}}*/
 615 // DPkgPM::WriteHistoryTag                                              /*{{{*/
 616 void pkgDPkgPM::WriteHistoryTag(string const &tag, string value)
 617 {
 618    size_t const length = value.length();
 619    if (length == 0)
 620       return;
 621    // poor mans rstrip(", ")
 622    if (value[length-2] == ',' && value[length-1] == ' ')
 623       value.erase(length - 2, 2);
 624    fprintf(history_out, "%s: %s\n", tag.c_str(), value.c_str());
 625 }                                                                       /*}}}*/
 626 // DPkgPM::OpenLog                                                      /*{{{*/
 627 bool pkgDPkgPM::OpenLog()
 628 {
 629    string const logdir = _config->FindDir("Dir::Log");
 630    if(not FileExists(logdir))
 631       return _error->Error(_("Directory '%s' missing"), logdir.c_str());
 632
 633    // get current time
 634    char timestr[200];
 635    time_t const t = time(NULL);
 636    struct tm const * const tmp = localtime(&t);
 637    strftime(timestr, sizeof(timestr), "%F  %T", tmp);
 638
 639    // open terminal log
 640    string const logfile_name = flCombine(logdir,
 641                                    _config->Find("Dir::Log::Terminal"));
 642    if (!logfile_name.empty())
 643    {
 644       term_out = fopen(logfile_name.c_str(),"a");
 645       if (term_out == NULL)
 646          return _error->WarningE("OpenLog", _("Could not open file '%s'"), logfile_name.c_str());
 647
 648       chmod(logfile_name.c_str(), 0600);
 649       fprintf(term_out, "\nLog started: %s\n", timestr);
 650    }
 651
 652    // write your history
 653    string const history_name = flCombine(logdir,
 654                                    _config->Find("Dir::Log::History"));
 655    if (!history_name.empty())
 656    {
 657       history_out = fopen(history_name.c_str(),"a");
 658       if (history_out == NULL)
 659          return _error->WarningE("OpenLog", _("Could not open file '%s'"), history_name.c_str());
 660       chmod(history_name.c_str(), 0644);
 661       fprintf(history_out, "\nStart-Date: %s\n", timestr);
 662       string remove, purge, install, upgrade, downgrade;
 663       for (pkgCache::PkgIterator I = Cache.PkgBegin(); I.end() == false; I++)
 664       {
 665          if (Cache[I].NewInstall())
 666             install += I.Name() + string(" (") + Cache[I].CandVersion + string("), ");
 667          else if (Cache[I].Upgrade())
 668             upgrade += I.Name() + string(" (") + Cache[I].CurVersion + string(", ") + Cache[I].CandVersion + string("), ");
 669          else if (Cache[I].Downgrade())
 670             downgrade += I.Name() + string(" (") + Cache[I].CurVersion + string(", ") + Cache[I].CandVersion + string("), ");
 671          else if (Cache[I].Delete())
 672          {
 673             if ((Cache[I].iFlags & pkgDepCache::Purge) == pkgDepCache::Purge)
 674                purge += I.Name() + string(" (") + Cache[I].CurVersion + string("), ");
 675             else
 676                remove += I.Name() + string(" (") + Cache[I].CurVersion + string("), ");
 677          }
 678       }
 679       if (_config->Exists("Commandline::AsString") == true)
 680          WriteHistoryTag("Commandline", _config->Find("Commandline::AsString"));
 681       WriteHistoryTag("Install", install);
 682       WriteHistoryTag("Upgrade", upgrade);
 683       WriteHistoryTag("Downgrade",downgrade);
 684       WriteHistoryTag("Remove",remove);
 685       WriteHistoryTag("Purge",purge);
 686       fflush(history_out);
 687    }
 688
 689    return true;
 690 }
 691                                                                         /*}}}*/
 692 // DPkg::CloseLog                                                       /*{{{*/
 693 bool pkgDPkgPM::CloseLog()
 694 {
 695    char timestr[200];
 696    time_t t = time(NULL);
 697    struct tm *tmp = localtime(&t);
 698    strftime(timestr, sizeof(timestr), "%F  %T", tmp);
 699
 700    if(term_out)
 701    {
 702       fprintf(term_out, "Log ended: ");
 703       fprintf(term_out, "%s", timestr);
 704       fprintf(term_out, "\n");
 705       fclose(term_out);
 706    }
 707    term_out = NULL;
 708
 709    if(history_out)
 710    {
 711       if (disappearedPkgs.empty() == false)
 712       {
 713          string disappear;
 714          for (std::set<std::string>::const_iterator d = disappearedPkgs.begin();
 715               d != disappearedPkgs.end(); ++d)
 716          {
 717             pkgCache::PkgIterator P = Cache.FindPkg(*d);
 718             disappear.append(*d);
 719             if (P.end() == true)
 720                disappear.append(", ");
 721             else
 722                disappear.append(" (").append(Cache[P].CurVersion).append("), ");
 723          }
 724          WriteHistoryTag("Disappeared", disappear);
 725       }
 726       if (dpkg_error.empty() == false)
 727          fprintf(history_out, "Error: %s\n", dpkg_error.c_str());
 728       fprintf(history_out, "End-Date: %s\n", timestr);
 729       fclose(history_out);
 730    }
 731    history_out = NULL;
 732
 733    return true;
 734 }
 735                                                                         /*}}}*/
 736 /*{{{*/
 737 // This implements a racy version of pselect for those architectures
 738 // that don't have a working implementation.
 739 // FIXME: Probably can be removed on Lenny+1
 740 static int racy_pselect(int nfds, fd_set *readfds, fd_set *writefds,
 741    fd_set *exceptfds, const struct timespec *timeout,
 742    const sigset_t *sigmask)
 743 {
 744    sigset_t origmask;
 745    struct timeval tv;
 746    int retval;
 747
 748    tv.tv_sec = timeout->tv_sec;
 749    tv.tv_usec = timeout->tv_nsec/1000;
 750
 751    sigprocmask(SIG_SETMASK, sigmask, &origmask);
 752    retval = select(nfds, readfds, writefds, exceptfds, &tv);
 753    sigprocmask(SIG_SETMASK, &origmask, 0);
 754    return retval;
 755 }
 756 /*}}}*/
 757 // DPkgPM::Go - Run the sequence                                        /*{{{*/
 758 // ---------------------------------------------------------------------
 759 /* This globs the operations and calls dpkg
 760  *
 761  * If it is called with "OutStatusFd" set to a valid file descriptor
 762  * apt will report the install progress over this fd. It maps the
 763  * dpkg states a package goes through to human readable (and i10n-able)
 764  * names and calculates a percentage for each step.
 765 */
 766 bool pkgDPkgPM::Go(int OutStatusFd)
 767 {
 768    fd_set rfds;
 769    struct timespec tv;
 770    sigset_t sigmask;
 771    sigset_t original_sigmask;
 772
 773    unsigned int const MaxArgs = _config->FindI("Dpkg::MaxArgs",8*1024);
 774    unsigned int const MaxArgBytes = _config->FindI("Dpkg::MaxArgBytes",32*1024);
 775    bool const NoTriggers = _config->FindB("DPkg::NoTriggers", false);
 776
 777    if (RunScripts("DPkg::Pre-Invoke") == false)
 778       return false;
 779
 780    if (RunScriptsWithPkgs("DPkg::Pre-Install-Pkgs") == false)
 781       return false;
 782
 783    // support subpressing of triggers processing for special
 784    // cases like d-i that runs the triggers handling manually
 785    bool const SmartConf = (_config->Find("PackageManager::Configure", "all") != "all");
 786    bool const TriggersPending = _config->FindB("DPkg::TriggersPending", false);
 787    if (_config->FindB("DPkg::ConfigurePending", SmartConf) == true)
 788       List.push_back(Item(Item::ConfigurePending, PkgIterator()));
 789
 790    // map the dpkg states to the operations that are performed
 791    // (this is sorted in the same way as Item::Ops)
 792    static const struct DpkgState DpkgStatesOpMap[][7] = {
 793       // Install operation
 794       {
 795          {"half-installed", N_("Preparing %s")},
 796          {"unpacked", N_("Unpacking %s") },
 797          {NULL, NULL}
 798       },
 799       // Configure operation
 800       {
 801          {"unpacked",N_("Preparing to configure %s") },
 802          {"half-configured", N_("Configuring %s") },
 803          { "installed", N_("Installed %s")},
 804          {NULL, NULL}
 805       },
 806       // Remove operation
 807       {
 808          {"half-configured", N_("Preparing for removal of %s")},
 809          {"half-installed", N_("Removing %s")},
 810          {"config-files",  N_("Removed %s")},
 811          {NULL, NULL}
 812       },
 813       // Purge operation
 814       {
 815          {"config-files", N_("Preparing to completely remove %s")},
 816          {"not-installed", N_("Completely removed %s")},
 817          {NULL, NULL}
 818       },
 819    };
 820
 821    // init the PackageOps map, go over the list of packages that
 822    // that will be [installed|configured|removed|purged] and add
 823    // them to the PackageOps map (the dpkg states it goes through)
 824    // and the PackageOpsTranslations (human readable strings)
 825    for (vector<Item>::const_iterator I = List.begin(); I != List.end();I++)
 826    {
 827       if((*I).Pkg.end() == true)
 828          continue;
 829
 830       string const name = (*I).Pkg.Name();
 831       PackageOpsDone[name] = 0;
 832       for(int i=0; (DpkgStatesOpMap[(*I).Op][i]).state != NULL;  i++)
 833       {
 834          PackageOps[name].push_back(DpkgStatesOpMap[(*I).Op][i]);
 835          PackagesTotal++;
 836       }
 837    }
 838
 839    stdin_is_dev_null = false;
 840
 841    // create log
 842    OpenLog();
 843
 844    // this loop is runs once per operation
 845    for (vector<Item>::const_iterator I = List.begin(); I != List.end();)
 846    {
 847       // Do all actions with the same Op in one run
 848       vector<Item>::const_iterator J = I;
 849       if (TriggersPending == true)
 850          for (; J != List.end(); J++)
 851          {
 852             if (J->Op == I->Op)
 853                continue;
 854             if (J->Op != Item::TriggersPending)
 855                break;
 856             vector<Item>::const_iterator T = J + 1;
 857             if (T != List.end() && T->Op == I->Op)
 858                continue;
 859             break;
 860          }
 861       else
 862          for (; J != List.end() && J->Op == I->Op; J++)
 863             /* nothing */;
 864
 865       // Generate the argument list
 866       const char *Args[MaxArgs + 50];
 867
 868       // Now check if we are within the MaxArgs limit
 869       //
 870       // this code below is problematic, because it may happen that
 871       // the argument list is split in a way that A depends on B
 872       // and they are in the same "--configure A B" run
 873       // - with the split they may now be configured in different
 874       //   runs
 875       if (J - I > (signed)MaxArgs)
 876          J = I + MaxArgs;
 877
 878       unsigned int n = 0;
 879       unsigned long Size = 0;
 880       string const Tmp = _config->Find("Dir::Bin::dpkg","dpkg");
 881       Args[n++] = Tmp.c_str();
 882       Size += strlen(Args[n-1]);
 883
 884       // Stick in any custom dpkg options
 885       Configuration::Item const *Opts = _config->Tree("DPkg::Options");
 886       if (Opts != 0)
 887       {
 888          Opts = Opts->Child;
 889          for (; Opts != 0; Opts = Opts->Next)
 890          {
 891             if (Opts->Value.empty() == true)
 892                continue;
 893             Args[n++] = Opts->Value.c_str();
 894             Size += Opts->Value.length();
 895          }
 896       }
 897
 898       char status_fd_buf[20];
 899       int fd[2];
 900       pipe(fd);
 901
 902       Args[n++] = "--status-fd";
 903       Size += strlen(Args[n-1]);
 904       snprintf(status_fd_buf,sizeof(status_fd_buf),"%i", fd[1]);
 905       Args[n++] = status_fd_buf;
 906       Size += strlen(Args[n-1]);
 907
 908       switch (I->Op)
 909       {
 910          case Item::Remove:
 911          Args[n++] = "--force-depends";
 912          Size += strlen(Args[n-1]);
 913          Args[n++] = "--force-remove-essential";
 914          Size += strlen(Args[n-1]);
 915          Args[n++] = "--remove";
 916          Size += strlen(Args[n-1]);
 917          break;
 918
 919          case Item::Purge:
 920          Args[n++] = "--force-depends";
 921          Size += strlen(Args[n-1]);
 922          Args[n++] = "--force-remove-essential";
 923          Size += strlen(Args[n-1]);
 924          Args[n++] = "--purge";
 925          Size += strlen(Args[n-1]);
 926          break;
 927
 928          case Item::Configure:
 929          Args[n++] = "--configure";
 930          Size += strlen(Args[n-1]);
 931          break;
 932
 933          case Item::ConfigurePending:
 934          Args[n++] = "--configure";
 935          Size += strlen(Args[n-1]);
 936          Args[n++] = "--pending";
 937          Size += strlen(Args[n-1]);
 938          break;
 939
 940          case Item::TriggersPending:
 941          Args[n++] = "--triggers-only";
 942          Size += strlen(Args[n-1]);
 943          Args[n++] = "--pending";
 944          Size += strlen(Args[n-1]);
 945          break;
 946
 947          case Item::Install:
 948          Args[n++] = "--unpack";
 949          Size += strlen(Args[n-1]);
 950          Args[n++] = "--auto-deconfigure";
 951          Size += strlen(Args[n-1]);
 952          break;
 953       }
 954
 955       if (NoTriggers == true && I->Op != Item::TriggersPending &&
 956           I->Op != Item::ConfigurePending)
 957       {
 958          Args[n++] = "--no-triggers";
 959          Size += strlen(Args[n-1]);
 960       }
 961
 962       // Write in the file or package names
 963       if (I->Op == Item::Install)
 964       {
 965          for (;I != J && Size < MaxArgBytes; I++)
 966          {
 967             if (I->File[0] != '/')
 968                return _error->Error("Internal Error, Pathname to install is not absolute '%s'",I->File.c_str());
 969             Args[n++] = I->File.c_str();
 970             Size += strlen(Args[n-1]);
 971          }
 972       }
 973       else
 974       {
 975          for (;I != J && Size < MaxArgBytes; I++)
 976          {
 977             if((*I).Pkg.end() == true)
 978                continue;
 979             if (I->Op == Item::Configure && disappearedPkgs.find(I->Pkg.Name()) != disappearedPkgs.end())
 980                continue;
 981             Args[n++] = I->Pkg.Name();
 982             Size += strlen(Args[n-1]);
 983          }
 984       }
 985       Args[n] = 0;
 986       J = I;
 987
 988       if (_config->FindB("Debug::pkgDPkgPM",false) == true)
 989       {
 990          for (unsigned int k = 0; k != n; k++)
 991             clog << Args[k] << ' ';
 992          clog << endl;
 993          continue;
 994       }
 995
 996       cout << flush;
 997       clog << flush;
 998       cerr << flush;
 999
1000       /* Mask off sig int/quit. We do this because dpkg also does when
1001          it forks scripts. What happens is that when you hit ctrl-c it sends
1002          it to all processes in the group. Since dpkg ignores the signal
1003          it doesn't die but we do! So we must also ignore it */
1004       sighandler_t old_SIGQUIT = signal(SIGQUIT,SIG_IGN);
1005       sighandler_t old_SIGINT = signal(SIGINT,SIG_IGN);
1006
1007       // ignore SIGHUP as well (debian #463030)
1008       sighandler_t old_SIGHUP = signal(SIGHUP,SIG_IGN);
1009
1010       struct    termios tt;
1011       struct    winsize win;
1012       int       master = -1;
1013       int       slave = -1;
1014
1015       // if tcgetattr does not return zero there was a error
1016       // and we do not do any pty magic
1017       if (tcgetattr(0, &tt) == 0)
1018       {
1019          ioctl(0, TIOCGWINSZ, (char *)&win);
1020          if (openpty(&master, &slave, NULL, &tt, &win) < 0)
1021          {
1022             const char *s = _("Can not write log, openpty() "
1023                               "failed (/dev/pts not mounted?)\n");
1024             fprintf(stderr, "%s",s);
1025             if(term_out)
1026               fprintf(term_out, "%s",s);
1027             master = slave = -1;
1028          }  else {
1029             struct termios rtt;
1030             rtt = tt;
1031             cfmakeraw(&rtt);
1032             rtt.c_lflag &= ~ECHO;
1033             rtt.c_lflag |= ISIG;
1034             // block SIGTTOU during tcsetattr to prevent a hang if
1035             // the process is a member of the background process group
1036             // http://www.opengroup.org/onlinepubs/000095399/functions/tcsetattr.html
1037             sigemptyset(&sigmask);
1038             sigaddset(&sigmask, SIGTTOU);
1039             sigprocmask(SIG_BLOCK,&sigmask, &original_sigmask);
1040             tcsetattr(0, TCSAFLUSH, &rtt);
1041             sigprocmask(SIG_SETMASK, &original_sigmask, 0);
1042          }
1043       }
1044
1045        // Fork dpkg
1046       pid_t Child;
1047       _config->Set("APT::Keep-Fds::",fd[1]);
1048       // send status information that we are about to fork dpkg
1049       if(OutStatusFd > 0) {
1050          ostringstream status;
1051          status << "pmstatus:dpkg-exec:"
1052                 << (PackagesDone/float(PackagesTotal)*100.0)
1053                 << ":" << _("Running dpkg")
1054                 << endl;
1055          write(OutStatusFd, status.str().c_str(), status.str().size());
1056       }
1057       Child = ExecFork();
1058
1059       // This is the child
1060       if (Child == 0)
1061       {
1062          if(slave >= 0 && master >= 0)
1063          {
1064             setsid();
1065             ioctl(slave, TIOCSCTTY, 0);
1066             close(master);
1067             dup2(slave, 0);
1068             dup2(slave, 1);
1069             dup2(slave, 2);
1070             close(slave);
1071          }
1072          close(fd[0]); // close the read end of the pipe
1073
1074          if (_config->FindDir("DPkg::Chroot-Directory","/") != "/")
1075          {
1076             std::cerr << "Chrooting into "
1077                       << _config->FindDir("DPkg::Chroot-Directory")
1078                       << std::endl;
1079             if (chroot(_config->FindDir("DPkg::Chroot-Directory","/").c_str()) != 0)
1080                _exit(100);
1081          }
1082
1083          if (chdir(_config->FindDir("DPkg::Run-Directory","/").c_str()) != 0)
1084             _exit(100);
1085
1086          if (_config->FindB("DPkg::FlushSTDIN",true) == true && isatty(STDIN_FILENO))
1087          {
1088             int Flags,dummy;
1089             if ((Flags = fcntl(STDIN_FILENO,F_GETFL,dummy)) < 0)
1090                _exit(100);
1091
1092             // Discard everything in stdin before forking dpkg
1093             if (fcntl(STDIN_FILENO,F_SETFL,Flags | O_NONBLOCK) < 0)
1094                _exit(100);
1095
1096             while (read(STDIN_FILENO,&dummy,1) == 1);
1097
1098             if (fcntl(STDIN_FILENO,F_SETFL,Flags & (~(long)O_NONBLOCK)) < 0)
1099                _exit(100);
1100          }
1101
1102          /* No Job Control Stop Env is a magic dpkg var that prevents it
1103             from using sigstop */
1104          putenv((char *)"DPKG_NO_TSTP=yes");
1105          execvp(Args[0],(char **)Args);
1106          cerr << "Could not exec dpkg!" << endl;
1107          _exit(100);
1108       }
1109
1110       // apply ionice
1111       if (_config->FindB("DPkg::UseIoNice", false) == true)
1112          ionice(Child);
1113
1114       // clear the Keep-Fd again
1115       _config->Clear("APT::Keep-Fds",fd[1]);
1116
1117       // Wait for dpkg
1118       int Status = 0;
1119
1120       // we read from dpkg here
1121       int const _dpkgin = fd[0];
1122       close(fd[1]);                        // close the write end of the pipe
1123
1124       if(slave > 0)
1125          close(slave);
1126
1127       // setups fds
1128       sigemptyset(&sigmask);
1129       sigprocmask(SIG_BLOCK,&sigmask,&original_sigmask);
1130
1131       // the result of the waitpid call
1132       int res;
1133       int select_ret;
1134       while ((res=waitpid(Child,&Status, WNOHANG)) != Child) {
1135          if(res < 0) {
1136             // FIXME: move this to a function or something, looks ugly here
1137             // error handling, waitpid returned -1
1138             if (errno == EINTR)
1139                continue;
1140             RunScripts("DPkg::Post-Invoke");
1141
1142             // Restore sig int/quit
1143             signal(SIGQUIT,old_SIGQUIT);
1144             signal(SIGINT,old_SIGINT);
1145             signal(SIGHUP,old_SIGHUP);
1146             return _error->Errno("waitpid","Couldn't wait for subprocess");
1147          }
1148
1149          // wait for input or output here
1150          FD_ZERO(&rfds);
1151          if (master >= 0 && !stdin_is_dev_null)
1152             FD_SET(0, &rfds);
1153          FD_SET(_dpkgin, &rfds);
1154          if(master >= 0)
1155             FD_SET(master, &rfds);
1156          tv.tv_sec = 1;
1157          tv.tv_nsec = 0;
1158          select_ret = pselect(max(master, _dpkgin)+1, &rfds, NULL, NULL,
1159                               &tv, &original_sigmask);
1160          if (select_ret < 0 && (errno == EINVAL || errno == ENOSYS))
1161             select_ret = racy_pselect(max(master, _dpkgin)+1, &rfds, NULL,
1162                                       NULL, &tv, &original_sigmask);
1163          if (select_ret == 0)
1164             continue;
1165          else if (select_ret < 0 && errno == EINTR)
1166             continue;
1167          else if (select_ret < 0)
1168          {
1169             perror("select() returned error");
1170             continue;
1171          }
1172
1173          if(master >= 0 && FD_ISSET(master, &rfds))
1174             DoTerminalPty(master);
1175          if(master >= 0 && FD_ISSET(0, &rfds))
1176             DoStdin(master);
1177          if(FD_ISSET(_dpkgin, &rfds))
1178             DoDpkgStatusFd(_dpkgin, OutStatusFd);
1179       }
1180       close(_dpkgin);
1181
1182       // Restore sig int/quit
1183       signal(SIGQUIT,old_SIGQUIT);
1184       signal(SIGINT,old_SIGINT);
1185       signal(SIGHUP,old_SIGHUP);
1186
1187       if(master >= 0)
1188       {
1189          tcsetattr(0, TCSAFLUSH, &tt);
1190          close(master);
1191       }
1192
1193       // Check for an error code.
1194       if (WIFEXITED(Status) == 0 || WEXITSTATUS(Status) != 0)
1195       {
1196          // if it was set to "keep-dpkg-runing" then we won't return
1197          // here but keep the loop going and just report it as a error
1198          // for later
1199          bool const stopOnError = _config->FindB("Dpkg::StopOnError",true);
1200
1201          if(stopOnError)
1202             RunScripts("DPkg::Post-Invoke");
1203
1204          if (WIFSIGNALED(Status) != 0 && WTERMSIG(Status) == SIGSEGV)
1205             strprintf(dpkg_error, "Sub-process %s received a segmentation fault.",Args[0]);
1206          else if (WIFEXITED(Status) != 0)
1207             strprintf(dpkg_error, "Sub-process %s returned an error code (%u)",Args[0],WEXITSTATUS(Status));
1208          else
1209             strprintf(dpkg_error, "Sub-process %s exited unexpectedly",Args[0]);
1210
1211          if(dpkg_error.size() > 0)
1212             _error->Error(dpkg_error.c_str());
1213
1214          if(stopOnError)
1215          {
1216             CloseLog();
1217             return false;
1218          }
1219       }
1220    }
1221    CloseLog();
1222
1223    if (RunScripts("DPkg::Post-Invoke") == false)
1224       return false;
1225
1226    Cache.writeStateFile(NULL);
1227    return true;
1228 }
1229                                                                         /*}}}*/
1230 // pkgDpkgPM::Reset - Dump the contents of the command list             /*{{{*/
1231 // ---------------------------------------------------------------------
1232 /* */
1233 void pkgDPkgPM::Reset()
1234 {
1235    List.erase(List.begin(),List.end());
1236 }
1237                                                                         /*}}}*/