apt-pkg/contrib/fileutl.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: fileutl.cc,v 1.42 2002/09/14 05:29:22 jgg Exp $
   4 /* ######################################################################
   5
   6    File Utilities
   7
   8    CopyFile - Buffered copy of a single file
   9    GetLock - dpkg compatible lock file manipulation (fcntl)
  10
  11    Most of this source is placed in the Public Domain, do with it what
  12    you will
  13    It was originally written by Jason Gunthorpe <jgg@debian.org>.
  14    FileFd gzip support added by Martin Pitt <martin.pitt@canonical.com>
  15
  16    The exception is RunScripts() it is under the GPLv2
  17
  18    ##################################################################### */
  19                                                                         /*}}}*/
  20 // Include Files                                                        /*{{{*/
  21 #include <config.h>
  22
  23 #include <apt-pkg/fileutl.h>
  24 #include <apt-pkg/strutl.h>
  25 #include <apt-pkg/error.h>
  26 #include <apt-pkg/sptr.h>
  27 #include <apt-pkg/aptconfiguration.h>
  28 #include <apt-pkg/configuration.h>
  29
  30 #include <cstdlib>
  31 #include <cstring>
  32 #include <cstdio>
  33
  34 #include <iostream>
  35 #include <unistd.h>
  36 #include <fcntl.h>
  37 #include <sys/stat.h>
  38 #include <sys/types.h>
  39 #include <sys/time.h>
  40 #include <sys/wait.h>
  41 #include <dirent.h>
  42 #include <signal.h>
  43 #include <errno.h>
  44 #include <glob.h>
  45
  46 #include <set>
  47 #include <algorithm>
  48
  49 #ifdef HAVE_ZLIB
  50         #include <zlib.h>
  51 #endif
  52 #ifdef HAVE_BZ2
  53         #include <bzlib.h>
  54 #endif
  55
  56 #ifdef WORDS_BIGENDIAN
  57 #include <inttypes.h>
  58 #endif
  59
  60 #include <apti18n.h>
  61                                                                         /*}}}*/
  62
  63 using namespace std;
  64
  65 class FileFdPrivate {
  66         public:
  67 #ifdef HAVE_ZLIB
  68         gzFile gz;
  69 #else
  70         void* gz;
  71 #endif
  72 #ifdef HAVE_BZ2
  73         BZFILE* bz2;
  74 #else
  75         void* bz2;
  76 #endif
  77         int compressed_fd;
  78         pid_t compressor_pid;
  79         bool pipe;
  80         APT::Configuration::Compressor compressor;
  81         unsigned int openmode;
  82         unsigned long long seekpos;
  83         FileFdPrivate() : gz(NULL), bz2(NULL),
  84                           compressed_fd(-1), compressor_pid(-1), pipe(false),
  85                           openmode(0), seekpos(0) {};
  86         bool CloseDown(std::string const &FileName)
  87         {
  88            bool Res = true;
  89 #ifdef HAVE_ZLIB
  90            if (gz != NULL) {
  91               int const e = gzclose(gz);
  92               gz = NULL;
  93               // gzdclose() on empty files always fails with "buffer error" here, ignore that
  94               if (e != 0 && e != Z_BUF_ERROR)
  95                  Res &= _error->Errno("close",_("Problem closing the gzip file %s"), FileName.c_str());
  96            }
  97 #endif
  98 #ifdef HAVE_BZ2
  99            if (bz2 != NULL) {
 100               BZ2_bzclose(bz2);
 101               bz2 = NULL;
 102            }
 103 #endif
 104            if (compressor_pid > 0)
 105               ExecWait(compressor_pid, "FileFdCompressor", true);
 106            compressor_pid = -1;
 107
 108            return Res;
 109         }
 110         ~FileFdPrivate() { CloseDown(""); }
 111 };
 112
 113 // RunScripts - Run a set of scripts from a configuration subtree       /*{{{*/
 114 // ---------------------------------------------------------------------
 115 /* */
 116 bool RunScripts(const char *Cnf)
 117 {
 118    Configuration::Item const *Opts = _config->Tree(Cnf);
 119    if (Opts == 0 || Opts->Child == 0)
 120       return true;
 121    Opts = Opts->Child;
 122
 123    // Fork for running the system calls
 124    pid_t Child = ExecFork();
 125
 126    // This is the child
 127    if (Child == 0)
 128    {
 129       if (_config->FindDir("DPkg::Chroot-Directory","/") != "/")
 130       {
 131          std::cerr << "Chrooting into "
 132                    << _config->FindDir("DPkg::Chroot-Directory")
 133                    << std::endl;
 134          if (chroot(_config->FindDir("DPkg::Chroot-Directory","/").c_str()) != 0)
 135             _exit(100);
 136       }
 137
 138       if (chdir("/tmp/") != 0)
 139          _exit(100);
 140
 141       unsigned int Count = 1;
 142       for (; Opts != 0; Opts = Opts->Next, Count++)
 143       {
 144          if (Opts->Value.empty() == true)
 145             continue;
 146
 147          if (system(Opts->Value.c_str()) != 0)
 148             _exit(100+Count);
 149       }
 150       _exit(0);
 151    }
 152
 153    // Wait for the child
 154    int Status = 0;
 155    while (waitpid(Child,&Status,0) != Child)
 156    {
 157       if (errno == EINTR)
 158          continue;
 159       return _error->Errno("waitpid","Couldn't wait for subprocess");
 160    }
 161
 162    // Restore sig int/quit
 163    signal(SIGQUIT,SIG_DFL);
 164    signal(SIGINT,SIG_DFL);
 165
 166    // Check for an error code.
 167    if (WIFEXITED(Status) == 0 || WEXITSTATUS(Status) != 0)
 168    {
 169       unsigned int Count = WEXITSTATUS(Status);
 170       if (Count > 100)
 171       {
 172          Count -= 100;
 173          for (; Opts != 0 && Count != 1; Opts = Opts->Next, Count--);
 174          _error->Error("Problem executing scripts %s '%s'",Cnf,Opts->Value.c_str());
 175       }
 176
 177       return _error->Error("Sub-process returned an error code");
 178    }
 179
 180    return true;
 181 }
 182                                                                         /*}}}*/
 183
 184 // CopyFile - Buffered copy of a file                                   /*{{{*/
 185 // ---------------------------------------------------------------------
 186 /* The caller is expected to set things so that failure causes erasure */
 187 bool CopyFile(FileFd &From,FileFd &To)
 188 {
 189    if (From.IsOpen() == false || To.IsOpen() == false ||
 190          From.Failed() == true || To.Failed() == true)
 191       return false;
 192
 193    // Buffered copy between fds
 194    SPtrArray<unsigned char> Buf = new unsigned char[64000];
 195    unsigned long long Size = From.Size();
 196    while (Size != 0)
 197    {
 198       unsigned long long ToRead = Size;
 199       if (Size > 64000)
 200          ToRead = 64000;
 201
 202       if (From.Read(Buf,ToRead) == false ||
 203           To.Write(Buf,ToRead) == false)
 204          return false;
 205
 206       Size -= ToRead;
 207    }
 208
 209    return true;
 210 }
 211                                                                         /*}}}*/
 212 // GetLock - Gets a lock file                                           /*{{{*/
 213 // ---------------------------------------------------------------------
 214 /* This will create an empty file of the given name and lock it. Once this
 215    is done all other calls to GetLock in any other process will fail with
 216    -1. The return result is the fd of the file, the call should call
 217    close at some time. */
 218 int GetLock(string File,bool Errors)
 219 {
 220    // GetLock() is used in aptitude on directories with public-write access
 221    // Use O_NOFOLLOW here to prevent symlink traversal attacks
 222    int FD = open(File.c_str(),O_RDWR | O_CREAT | O_NOFOLLOW,0640);
 223    if (FD < 0)
 224    {
 225       // Read only .. cant have locking problems there.
 226       if (errno == EROFS)
 227       {
 228          _error->Warning(_("Not using locking for read only lock file %s"),File.c_str());
 229          return dup(0);       // Need something for the caller to close
 230       }
 231
 232       if (Errors == true)
 233          _error->Errno("open",_("Could not open lock file %s"),File.c_str());
 234
 235       // Feh.. We do this to distinguish the lock vs open case..
 236       errno = EPERM;
 237       return -1;
 238    }
 239    SetCloseExec(FD,true);
 240
 241    // Aquire a write lock
 242    struct flock fl;
 243    fl.l_type = F_WRLCK;
 244    fl.l_whence = SEEK_SET;
 245    fl.l_start = 0;
 246    fl.l_len = 0;
 247    if (fcntl(FD,F_SETLK,&fl) == -1)
 248    {
 249       // always close to not leak resources
 250       int Tmp = errno;
 251       close(FD);
 252       errno = Tmp;
 253
 254       if (errno == ENOLCK)
 255       {
 256          _error->Warning(_("Not using locking for nfs mounted lock file %s"),File.c_str());
 257          return dup(0);       // Need something for the caller to close
 258       }
 259
 260       if (Errors == true)
 261          _error->Errno("open",_("Could not get lock %s"),File.c_str());
 262
 263       return -1;
 264    }
 265
 266    return FD;
 267 }
 268                                                                         /*}}}*/
 269 // FileExists - Check if a file exists                                  /*{{{*/
 270 // ---------------------------------------------------------------------
 271 /* Beware: Directories are also files! */
 272 bool FileExists(string File)
 273 {
 274    struct stat Buf;
 275    if (stat(File.c_str(),&Buf) != 0)
 276       return false;
 277    return true;
 278 }
 279                                                                         /*}}}*/
 280 // RealFileExists - Check if a file exists and if it is really a file   /*{{{*/
 281 // ---------------------------------------------------------------------
 282 /* */
 283 bool RealFileExists(string File)
 284 {
 285    struct stat Buf;
 286    if (stat(File.c_str(),&Buf) != 0)
 287       return false;
 288    return ((Buf.st_mode & S_IFREG) != 0);
 289 }
 290                                                                         /*}}}*/
 291 // DirectoryExists - Check if a directory exists and is really one      /*{{{*/
 292 // ---------------------------------------------------------------------
 293 /* */
 294 bool DirectoryExists(string const &Path)
 295 {
 296    struct stat Buf;
 297    if (stat(Path.c_str(),&Buf) != 0)
 298       return false;
 299    return ((Buf.st_mode & S_IFDIR) != 0);
 300 }
 301                                                                         /*}}}*/
 302 // CreateDirectory - poor man's mkdir -p guarded by a parent directory  /*{{{*/
 303 // ---------------------------------------------------------------------
 304 /* This method will create all directories needed for path in good old
 305    mkdir -p style but refuses to do this if Parent is not a prefix of
 306    this Path. Example: /var/cache/ and /var/cache/apt/archives are given,
 307    so it will create apt/archives if /var/cache exists - on the other
 308    hand if the parent is /var/lib the creation will fail as this path
 309    is not a parent of the path to be generated. */
 310 bool CreateDirectory(string const &Parent, string const &Path)
 311 {
 312    if (Parent.empty() == true || Path.empty() == true)
 313       return false;
 314
 315    if (DirectoryExists(Path) == true)
 316       return true;
 317
 318    if (DirectoryExists(Parent) == false)
 319       return false;
 320
 321    // we are not going to create directories "into the blue"
 322    if (Path.find(Parent, 0) != 0)
 323       return false;
 324
 325    vector<string> const dirs = VectorizeString(Path.substr(Parent.size()), '/');
 326    string progress = Parent;
 327    for (vector<string>::const_iterator d = dirs.begin(); d != dirs.end(); ++d)
 328    {
 329       if (d->empty() == true)
 330          continue;
 331
 332       progress.append("/").append(*d);
 333       if (DirectoryExists(progress) == true)
 334          continue;
 335
 336       if (mkdir(progress.c_str(), 0755) != 0)
 337          return false;
 338    }
 339    return true;
 340 }
 341                                                                         /*}}}*/
 342 // CreateAPTDirectoryIfNeeded - ensure that the given directory exists          /*{{{*/
 343 // ---------------------------------------------------------------------
 344 /* a small wrapper around CreateDirectory to check if it exists and to
 345    remove the trailing "/apt/" from the parent directory if needed */
 346 bool CreateAPTDirectoryIfNeeded(string const &Parent, string const &Path)
 347 {
 348    if (DirectoryExists(Path) == true)
 349       return true;
 350
 351    size_t const len = Parent.size();
 352    if (len > 5 && Parent.find("/apt/", len - 6, 5) == len - 5)
 353    {
 354       if (CreateDirectory(Parent.substr(0,len-5), Path) == true)
 355          return true;
 356    }
 357    else if (CreateDirectory(Parent, Path) == true)
 358       return true;
 359
 360    return false;
 361 }
 362                                                                         /*}}}*/
 363 // GetListOfFilesInDir - returns a vector of files in the given dir     /*{{{*/
 364 // ---------------------------------------------------------------------
 365 /* If an extension is given only files with this extension are included
 366    in the returned vector, otherwise every "normal" file is included. */
 367 std::vector<string> GetListOfFilesInDir(string const &Dir, string const &Ext,
 368                                         bool const &SortList, bool const &AllowNoExt)
 369 {
 370    std::vector<string> ext;
 371    ext.reserve(2);
 372    if (Ext.empty() == false)
 373       ext.push_back(Ext);
 374    if (AllowNoExt == true && ext.empty() == false)
 375       ext.push_back("");
 376    return GetListOfFilesInDir(Dir, ext, SortList);
 377 }
 378 std::vector<string> GetListOfFilesInDir(string const &Dir, std::vector<string> const &Ext,
 379                                         bool const &SortList)
 380 {
 381    // Attention debuggers: need to be set with the environment config file!
 382    bool const Debug = _config->FindB("Debug::GetListOfFilesInDir", false);
 383    if (Debug == true)
 384    {
 385       std::clog << "Accept in " << Dir << " only files with the following " << Ext.size() << " extensions:" << std::endl;
 386       if (Ext.empty() == true)
 387          std::clog << "\tNO extension" << std::endl;
 388       else
 389          for (std::vector<string>::const_iterator e = Ext.begin();
 390               e != Ext.end(); ++e)
 391             std::clog << '\t' << (e->empty() == true ? "NO" : *e) << " extension" << std::endl;
 392    }
 393
 394    std::vector<string> List;
 395
 396    if (DirectoryExists(Dir) == false)
 397    {
 398       _error->Error(_("List of files can't be created as '%s' is not a directory"), Dir.c_str());
 399       return List;
 400    }
 401
 402    Configuration::MatchAgainstConfig SilentIgnore("Dir::Ignore-Files-Silently");
 403    DIR *D = opendir(Dir.c_str());
 404    if (D == 0)
 405    {
 406       _error->Errno("opendir",_("Unable to read %s"),Dir.c_str());
 407       return List;
 408    }
 409
 410    for (struct dirent *Ent = readdir(D); Ent != 0; Ent = readdir(D))
 411    {
 412       // skip "hidden" files
 413       if (Ent->d_name[0] == '.')
 414          continue;
 415
 416       // Make sure it is a file and not something else
 417       string const File = flCombine(Dir,Ent->d_name);
 418 #ifdef _DIRENT_HAVE_D_TYPE
 419       if (Ent->d_type != DT_REG)
 420 #endif
 421       {
 422          if (RealFileExists(File) == false)
 423          {
 424             // do not show ignoration warnings for directories
 425             if (
 426 #ifdef _DIRENT_HAVE_D_TYPE
 427                 Ent->d_type == DT_DIR ||
 428 #endif
 429                 DirectoryExists(File) == true)
 430                continue;
 431             if (SilentIgnore.Match(Ent->d_name) == false)
 432                _error->Notice(_("Ignoring '%s' in directory '%s' as it is not a regular file"), Ent->d_name, Dir.c_str());
 433             continue;
 434          }
 435       }
 436
 437       // check for accepted extension:
 438       // no extension given -> periods are bad as hell!
 439       // extensions given -> "" extension allows no extension
 440       if (Ext.empty() == false)
 441       {
 442          string d_ext = flExtension(Ent->d_name);
 443          if (d_ext == Ent->d_name) // no extension
 444          {
 445             if (std::find(Ext.begin(), Ext.end(), "") == Ext.end())
 446             {
 447                if (Debug == true)
 448                   std::clog << "Bad file: " << Ent->d_name << " → no extension" << std::endl;
 449                if (SilentIgnore.Match(Ent->d_name) == false)
 450                   _error->Notice(_("Ignoring file '%s' in directory '%s' as it has no filename extension"), Ent->d_name, Dir.c_str());
 451                continue;
 452             }
 453          }
 454          else if (std::find(Ext.begin(), Ext.end(), d_ext) == Ext.end())
 455          {
 456             if (Debug == true)
 457                std::clog << "Bad file: " << Ent->d_name << " → bad extension »" << flExtension(Ent->d_name) << "«" << std::endl;
 458             if (SilentIgnore.Match(Ent->d_name) == false)
 459                _error->Notice(_("Ignoring file '%s' in directory '%s' as it has an invalid filename extension"), Ent->d_name, Dir.c_str());
 460             continue;
 461          }
 462       }
 463
 464       // Skip bad filenames ala run-parts
 465       const char *C = Ent->d_name;
 466       for (; *C != 0; ++C)
 467          if (isalpha(*C) == 0 && isdigit(*C) == 0
 468              && *C != '_' && *C != '-') {
 469             // no required extension -> dot is a bad character
 470             if (*C == '.' && Ext.empty() == false)
 471                continue;
 472             break;
 473          }
 474
 475       // we don't reach the end of the name -> bad character included
 476       if (*C != 0)
 477       {
 478          if (Debug == true)
 479             std::clog << "Bad file: " << Ent->d_name << " → bad character »"
 480                << *C << "« in filename (period allowed: " << (Ext.empty() ? "no" : "yes") << ")" << std::endl;
 481          continue;
 482       }
 483
 484       // skip filenames which end with a period. These are never valid
 485       if (*(C - 1) == '.')
 486       {
 487          if (Debug == true)
 488             std::clog << "Bad file: " << Ent->d_name << " → Period as last character" << std::endl;
 489          continue;
 490       }
 491
 492       if (Debug == true)
 493          std::clog << "Accept file: " << Ent->d_name << " in " << Dir << std::endl;
 494       List.push_back(File);
 495    }
 496    closedir(D);
 497
 498    if (SortList == true)
 499       std::sort(List.begin(),List.end());
 500    return List;
 501 }
 502 std::vector<string> GetListOfFilesInDir(string const &Dir, bool SortList)
 503 {
 504    bool const Debug = _config->FindB("Debug::GetListOfFilesInDir", false);
 505    if (Debug == true)
 506       std::clog << "Accept in " << Dir << " all regular files" << std::endl;
 507
 508    std::vector<string> List;
 509
 510    if (DirectoryExists(Dir) == false)
 511    {
 512       _error->Error(_("List of files can't be created as '%s' is not a directory"), Dir.c_str());
 513       return List;
 514    }
 515
 516    DIR *D = opendir(Dir.c_str());
 517    if (D == 0)
 518    {
 519       _error->Errno("opendir",_("Unable to read %s"),Dir.c_str());
 520       return List;
 521    }
 522
 523    for (struct dirent *Ent = readdir(D); Ent != 0; Ent = readdir(D))
 524    {
 525       // skip "hidden" files
 526       if (Ent->d_name[0] == '.')
 527          continue;
 528
 529       // Make sure it is a file and not something else
 530       string const File = flCombine(Dir,Ent->d_name);
 531 #ifdef _DIRENT_HAVE_D_TYPE
 532       if (Ent->d_type != DT_REG)
 533 #endif
 534       {
 535          if (RealFileExists(File) == false)
 536          {
 537             if (Debug == true)
 538                std::clog << "Bad file: " << Ent->d_name << " → it is not a real file" << std::endl;
 539             continue;
 540          }
 541       }
 542
 543       // Skip bad filenames ala run-parts
 544       const char *C = Ent->d_name;
 545       for (; *C != 0; ++C)
 546          if (isalpha(*C) == 0 && isdigit(*C) == 0
 547              && *C != '_' && *C != '-' && *C != '.')
 548             break;
 549
 550       // we don't reach the end of the name -> bad character included
 551       if (*C != 0)
 552       {
 553          if (Debug == true)
 554             std::clog << "Bad file: " << Ent->d_name << " → bad character »" << *C << "« in filename" << std::endl;
 555          continue;
 556       }
 557
 558       // skip filenames which end with a period. These are never valid
 559       if (*(C - 1) == '.')
 560       {
 561          if (Debug == true)
 562             std::clog << "Bad file: " << Ent->d_name << " → Period as last character" << std::endl;
 563          continue;
 564       }
 565
 566       if (Debug == true)
 567          std::clog << "Accept file: " << Ent->d_name << " in " << Dir << std::endl;
 568       List.push_back(File);
 569    }
 570    closedir(D);
 571
 572    if (SortList == true)
 573       std::sort(List.begin(),List.end());
 574    return List;
 575 }
 576                                                                         /*}}}*/
 577 // SafeGetCWD - This is a safer getcwd that returns a dynamic string    /*{{{*/
 578 // ---------------------------------------------------------------------
 579 /* We return / on failure. */
 580 string SafeGetCWD()
 581 {
 582    // Stash the current dir.
 583    char S[300];
 584    S[0] = 0;
 585    if (getcwd(S,sizeof(S)-2) == 0)
 586       return "/";
 587    unsigned int Len = strlen(S);
 588    S[Len] = '/';
 589    S[Len+1] = 0;
 590    return S;
 591 }
 592                                                                         /*}}}*/
 593 // GetModificationTime - Get the mtime of the given file or -1 on error /*{{{*/
 594 // ---------------------------------------------------------------------
 595 /* We return / on failure. */
 596 time_t GetModificationTime(string const &Path)
 597 {
 598    struct stat St;
 599    if (stat(Path.c_str(), &St) < 0)
 600       return -1;
 601    return  St.st_mtime;
 602 }
 603                                                                         /*}}}*/
 604 // flNotDir - Strip the directory from the filename                     /*{{{*/
 605 // ---------------------------------------------------------------------
 606 /* */
 607 string flNotDir(string File)
 608 {
 609    string::size_type Res = File.rfind('/');
 610    if (Res == string::npos)
 611       return File;
 612    Res++;
 613    return string(File,Res,Res - File.length());
 614 }
 615                                                                         /*}}}*/
 616 // flNotFile - Strip the file from the directory name                   /*{{{*/
 617 // ---------------------------------------------------------------------
 618 /* Result ends in a / */
 619 string flNotFile(string File)
 620 {
 621    string::size_type Res = File.rfind('/');
 622    if (Res == string::npos)
 623       return "./";
 624    Res++;
 625    return string(File,0,Res);
 626 }
 627                                                                         /*}}}*/
 628 // flExtension - Return the extension for the file                      /*{{{*/
 629 // ---------------------------------------------------------------------
 630 /* */
 631 string flExtension(string File)
 632 {
 633    string::size_type Res = File.rfind('.');
 634    if (Res == string::npos)
 635       return File;
 636    Res++;
 637    return string(File,Res,Res - File.length());
 638 }
 639                                                                         /*}}}*/
 640 // flNoLink - If file is a symlink then deref it                        /*{{{*/
 641 // ---------------------------------------------------------------------
 642 /* If the name is not a link then the returned path is the input. */
 643 string flNoLink(string File)
 644 {
 645    struct stat St;
 646    if (lstat(File.c_str(),&St) != 0 || S_ISLNK(St.st_mode) == 0)
 647       return File;
 648    if (stat(File.c_str(),&St) != 0)
 649       return File;
 650
 651    /* Loop resolving the link. There is no need to limit the number of
 652       loops because the stat call above ensures that the symlink is not
 653       circular */
 654    char Buffer[1024];
 655    string NFile = File;
 656    while (1)
 657    {
 658       // Read the link
 659       int Res;
 660       if ((Res = readlink(NFile.c_str(),Buffer,sizeof(Buffer))) <= 0 ||
 661           (unsigned)Res >= sizeof(Buffer))
 662           return File;
 663
 664       // Append or replace the previous path
 665       Buffer[Res] = 0;
 666       if (Buffer[0] == '/')
 667          NFile = Buffer;
 668       else
 669          NFile = flNotFile(NFile) + Buffer;
 670
 671       // See if we are done
 672       if (lstat(NFile.c_str(),&St) != 0)
 673          return File;
 674       if (S_ISLNK(St.st_mode) == 0)
 675          return NFile;
 676    }
 677 }
 678                                                                         /*}}}*/
 679 // flCombine - Combine a file and a directory                           /*{{{*/
 680 // ---------------------------------------------------------------------
 681 /* If the file is an absolute path then it is just returned, otherwise
 682    the directory is pre-pended to it. */
 683 string flCombine(string Dir,string File)
 684 {
 685    if (File.empty() == true)
 686       return string();
 687
 688    if (File[0] == '/' || Dir.empty() == true)
 689       return File;
 690    if (File.length() >= 2 && File[0] == '.' && File[1] == '/')
 691       return File;
 692    if (Dir[Dir.length()-1] == '/')
 693       return Dir + File;
 694    return Dir + '/' + File;
 695 }
 696                                                                         /*}}}*/
 697 // SetCloseExec - Set the close on exec flag                            /*{{{*/
 698 // ---------------------------------------------------------------------
 699 /* */
 700 void SetCloseExec(int Fd,bool Close)
 701 {
 702    if (fcntl(Fd,F_SETFD,(Close == false)?0:FD_CLOEXEC) != 0)
 703    {
 704       cerr << "FATAL -> Could not set close on exec " << strerror(errno) << endl;
 705       exit(100);
 706    }
 707 }
 708                                                                         /*}}}*/
 709 // SetNonBlock - Set the nonblocking flag                               /*{{{*/
 710 // ---------------------------------------------------------------------
 711 /* */
 712 void SetNonBlock(int Fd,bool Block)
 713 {
 714    int Flags = fcntl(Fd,F_GETFL) & (~O_NONBLOCK);
 715    if (fcntl(Fd,F_SETFL,Flags | ((Block == false)?0:O_NONBLOCK)) != 0)
 716    {
 717       cerr << "FATAL -> Could not set non-blocking flag " << strerror(errno) << endl;
 718       exit(100);
 719    }
 720 }
 721                                                                         /*}}}*/
 722 // WaitFd - Wait for a FD to become readable                            /*{{{*/
 723 // ---------------------------------------------------------------------
 724 /* This waits for a FD to become readable using select. It is useful for
 725    applications making use of non-blocking sockets. The timeout is
 726    in seconds. */
 727 bool WaitFd(int Fd,bool write,unsigned long timeout)
 728 {
 729    fd_set Set;
 730    struct timeval tv;
 731    FD_ZERO(&Set);
 732    FD_SET(Fd,&Set);
 733    tv.tv_sec = timeout;
 734    tv.tv_usec = 0;
 735    if (write == true)
 736    {
 737       int Res;
 738       do
 739       {
 740          Res = select(Fd+1,0,&Set,0,(timeout != 0?&tv:0));
 741       }
 742       while (Res < 0 && errno == EINTR);
 743
 744       if (Res <= 0)
 745          return false;
 746    }
 747    else
 748    {
 749       int Res;
 750       do
 751       {
 752          Res = select(Fd+1,&Set,0,0,(timeout != 0?&tv:0));
 753       }
 754       while (Res < 0 && errno == EINTR);
 755
 756       if (Res <= 0)
 757          return false;
 758    }
 759
 760    return true;
 761 }
 762                                                                         /*}}}*/
 763 // ExecFork - Magical fork that sanitizes the context before execing    /*{{{*/
 764 // ---------------------------------------------------------------------
 765 /* This is used if you want to cleanse the environment for the forked
 766    child, it fixes up the important signals and nukes all of the fds,
 767    otherwise acts like normal fork. */
 768 pid_t ExecFork()
 769 {
 770    // Fork off the process
 771    pid_t Process = fork();
 772    if (Process < 0)
 773    {
 774       cerr << "FATAL -> Failed to fork." << endl;
 775       exit(100);
 776    }
 777
 778    // Spawn the subprocess
 779    if (Process == 0)
 780    {
 781       // Setup the signals
 782       signal(SIGPIPE,SIG_DFL);
 783       signal(SIGQUIT,SIG_DFL);
 784       signal(SIGINT,SIG_DFL);
 785       signal(SIGWINCH,SIG_DFL);
 786       signal(SIGCONT,SIG_DFL);
 787       signal(SIGTSTP,SIG_DFL);
 788
 789       set<int> KeepFDs;
 790       Configuration::Item const *Opts = _config->Tree("APT::Keep-Fds");
 791       if (Opts != 0 && Opts->Child != 0)
 792       {
 793          Opts = Opts->Child;
 794          for (; Opts != 0; Opts = Opts->Next)
 795          {
 796             if (Opts->Value.empty() == true)
 797                continue;
 798             int fd = atoi(Opts->Value.c_str());
 799             KeepFDs.insert(fd);
 800          }
 801       }
 802
 803       // Close all of our FDs - just in case
 804       for (int K = 3; K != 40; K++)
 805       {
 806          if(KeepFDs.find(K) == KeepFDs.end())
 807             fcntl(K,F_SETFD,FD_CLOEXEC);
 808       }
 809    }
 810
 811    return Process;
 812 }
 813                                                                         /*}}}*/
 814 // ExecWait - Fancy waitpid                                             /*{{{*/
 815 // ---------------------------------------------------------------------
 816 /* Waits for the given sub process. If Reap is set then no errors are
 817    generated. Otherwise a failed subprocess will generate a proper descriptive
 818    message */
 819 bool ExecWait(pid_t Pid,const char *Name,bool Reap)
 820 {
 821    if (Pid <= 1)
 822       return true;
 823
 824    // Wait and collect the error code
 825    int Status;
 826    while (waitpid(Pid,&Status,0) != Pid)
 827    {
 828       if (errno == EINTR)
 829          continue;
 830
 831       if (Reap == true)
 832          return false;
 833
 834       return _error->Error(_("Waited for %s but it wasn't there"),Name);
 835    }
 836
 837
 838    // Check for an error code.
 839    if (WIFEXITED(Status) == 0 || WEXITSTATUS(Status) != 0)
 840    {
 841       if (Reap == true)
 842          return false;
 843       if (WIFSIGNALED(Status) != 0)
 844       {
 845          if( WTERMSIG(Status) == SIGSEGV)
 846             return _error->Error(_("Sub-process %s received a segmentation fault."),Name);
 847          else
 848             return _error->Error(_("Sub-process %s received signal %u."),Name, WTERMSIG(Status));
 849       }
 850
 851       if (WIFEXITED(Status) != 0)
 852          return _error->Error(_("Sub-process %s returned an error code (%u)"),Name,WEXITSTATUS(Status));
 853
 854       return _error->Error(_("Sub-process %s exited unexpectedly"),Name);
 855    }
 856
 857    return true;
 858 }
 859                                                                         /*}}}*/
 860
 861 // FileFd::Open - Open a file                                           /*{{{*/
 862 // ---------------------------------------------------------------------
 863 /* The most commonly used open mode combinations are given with Mode */
 864 bool FileFd::Open(string FileName,unsigned int const Mode,CompressMode Compress, unsigned long const Perms)
 865 {
 866    if (Mode == ReadOnlyGzip)
 867       return Open(FileName, ReadOnly, Gzip, Perms);
 868
 869    if (Compress == Auto && (Mode & WriteOnly) == WriteOnly)
 870       return FileFdError("Autodetection on %s only works in ReadOnly openmode!", FileName.c_str());
 871
 872    std::vector<APT::Configuration::Compressor> const compressors = APT::Configuration::getCompressors();
 873    std::vector<APT::Configuration::Compressor>::const_iterator compressor = compressors.begin();
 874    if (Compress == Auto)
 875    {
 876       for (; compressor != compressors.end(); ++compressor)
 877       {
 878          std::string file = std::string(FileName).append(compressor->Extension);
 879          if (FileExists(file) == false)
 880             continue;
 881          FileName = file;
 882          break;
 883       }
 884    }
 885    else if (Compress == Extension)
 886    {
 887       std::string::size_type const found = FileName.find_last_of('.');
 888       std::string ext;
 889       if (found != std::string::npos)
 890       {
 891          ext = FileName.substr(found);
 892          if (ext == ".new" || ext == ".bak")
 893          {
 894             std::string::size_type const found2 = FileName.find_last_of('.', found - 1);
 895             if (found2 != std::string::npos)
 896                ext = FileName.substr(found2, found - found2);
 897             else
 898                ext.clear();
 899          }
 900       }
 901       for (; compressor != compressors.end(); ++compressor)
 902          if (ext == compressor->Extension)
 903             break;
 904       // no matching extension - assume uncompressed (imagine files like 'example.org_Packages')
 905       if (compressor == compressors.end())
 906          for (compressor = compressors.begin(); compressor != compressors.end(); ++compressor)
 907             if (compressor->Name == ".")
 908                break;
 909    }
 910    else
 911    {
 912       std::string name;
 913       switch (Compress)
 914       {
 915       case None: name = "."; break;
 916       case Gzip: name = "gzip"; break;
 917       case Bzip2: name = "bzip2"; break;
 918       case Lzma: name = "lzma"; break;
 919       case Xz: name = "xz"; break;
 920       case Auto:
 921       case Extension:
 922          // Unreachable
 923          return FileFdError("Opening File %s in None, Auto or Extension should be already handled?!?", FileName.c_str());
 924       }
 925       for (; compressor != compressors.end(); ++compressor)
 926          if (compressor->Name == name)
 927             break;
 928       if (compressor == compressors.end())
 929          return FileFdError("Can't find a configured compressor %s for file %s", name.c_str(), FileName.c_str());
 930    }
 931
 932    if (compressor == compressors.end())
 933       return FileFdError("Can't find a match for specified compressor mode for file %s", FileName.c_str());
 934    return Open(FileName, Mode, *compressor, Perms);
 935 }
 936 bool FileFd::Open(string FileName,unsigned int const Mode,APT::Configuration::Compressor const &compressor, unsigned long const Perms)
 937 {
 938    Close();
 939    Flags = AutoClose;
 940
 941    if ((Mode & WriteOnly) != WriteOnly && (Mode & (Atomic | Create | Empty | Exclusive)) != 0)
 942       return FileFdError("ReadOnly mode for %s doesn't accept additional flags!", FileName.c_str());
 943    if ((Mode & ReadWrite) == 0)
 944       return FileFdError("No openmode provided in FileFd::Open for %s", FileName.c_str());
 945
 946    if ((Mode & Atomic) == Atomic)
 947    {
 948       Flags |= Replace;
 949    }
 950    else if ((Mode & (Exclusive | Create)) == (Exclusive | Create))
 951    {
 952       // for atomic, this will be done by rename in Close()
 953       unlink(FileName.c_str());
 954    }
 955    if ((Mode & Empty) == Empty)
 956    {
 957       struct stat Buf;
 958       if (lstat(FileName.c_str(),&Buf) == 0 && S_ISLNK(Buf.st_mode))
 959          unlink(FileName.c_str());
 960    }
 961
 962    int fileflags = 0;
 963    #define if_FLAGGED_SET(FLAG, MODE) if ((Mode & FLAG) == FLAG) fileflags |= MODE
 964    if_FLAGGED_SET(ReadWrite, O_RDWR);
 965    else if_FLAGGED_SET(ReadOnly, O_RDONLY);
 966    else if_FLAGGED_SET(WriteOnly, O_WRONLY);
 967
 968    if_FLAGGED_SET(Create, O_CREAT);
 969    if_FLAGGED_SET(Empty, O_TRUNC);
 970    if_FLAGGED_SET(Exclusive, O_EXCL);
 971    else if_FLAGGED_SET(Atomic, O_EXCL);
 972    #undef if_FLAGGED_SET
 973
 974    if ((Mode & Atomic) == Atomic)
 975    {
 976       char *name = strdup((FileName + ".XXXXXX").c_str());
 977
 978       if((iFd = mkostemp(name, fileflags)) == -1)
 979       {
 980           free(name);
 981           return FileFdErrno("mkostemp", "Could not create temporary file for %s", FileName.c_str());
 982       }
 983
 984       TemporaryFileName = string(name);
 985
 986       if(fchmod(iFd, Perms) == -1)
 987       {
 988           free(name);
 989           return FileFdErrno("fchmod", "Could not assign permissions to temporary file %s with error %s", FileName.c_str(), strerror(errno));
 990       }
 991       free(name);
 992    }
 993    else
 994       iFd = open(FileName.c_str(), fileflags, Perms);
 995
 996    this->FileName = FileName;
 997    if (iFd == -1 || OpenInternDescriptor(Mode, compressor) == false)
 998    {
 999       if (iFd != -1)
1000       {
1001          close (iFd);
1002          iFd = -1;
1003       }
1004       return FileFdErrno("open",_("Could not open file %s"), FileName.c_str());
1005    }
1006
1007    SetCloseExec(iFd,true);
1008    return true;
1009 }
1010                                                                         /*}}}*/
1011 // FileFd::OpenDescriptor - Open a filedescriptor                       /*{{{*/
1012 // ---------------------------------------------------------------------
1013 /* */
1014 bool FileFd::OpenDescriptor(int Fd, unsigned int const Mode, CompressMode Compress, bool AutoClose)
1015 {
1016    std::vector<APT::Configuration::Compressor> const compressors = APT::Configuration::getCompressors();
1017    std::vector<APT::Configuration::Compressor>::const_iterator compressor = compressors.begin();
1018    std::string name;
1019
1020    // compat with the old API
1021    if (Mode == ReadOnlyGzip && Compress == None)
1022       Compress = Gzip;
1023
1024    switch (Compress)
1025    {
1026    case None: name = "."; break;
1027    case Gzip: name = "gzip"; break;
1028    case Bzip2: name = "bzip2"; break;
1029    case Lzma: name = "lzma"; break;
1030    case Xz: name = "xz"; break;
1031    case Auto:
1032    case Extension:
1033       if (AutoClose == true && Fd != -1)
1034          close(Fd);
1035       return FileFdError("Opening Fd %d in Auto or Extension compression mode is not supported", Fd);
1036    }
1037    for (; compressor != compressors.end(); ++compressor)
1038       if (compressor->Name == name)
1039          break;
1040    if (compressor == compressors.end())
1041    {
1042       if (AutoClose == true && Fd != -1)
1043          close(Fd);
1044       return FileFdError("Can't find a configured compressor %s for file %s", name.c_str(), FileName.c_str());
1045    }
1046    return OpenDescriptor(Fd, Mode, *compressor, AutoClose);
1047 }
1048 bool FileFd::OpenDescriptor(int Fd, unsigned int const Mode, APT::Configuration::Compressor const &compressor, bool AutoClose)
1049 {
1050    Close();
1051    Flags = (AutoClose) ? FileFd::AutoClose : 0;
1052    if (AutoClose == false && (
1053 #ifdef HAVE_ZLIB
1054         compressor.Name == "gzip" ||
1055 #endif
1056 #ifdef HAVE_BZ2
1057         compressor.Name == "bzip2" ||
1058 #endif
1059         false))
1060    {
1061       // Need to duplicate fd here or gzclose for cleanup will close the fd as well
1062       iFd = dup(Fd);
1063    }
1064    else
1065       iFd = Fd;
1066    this->FileName = "";
1067    if (Fd == -1 || OpenInternDescriptor(Mode, compressor) == false)
1068    {
1069       if (iFd != -1 && (
1070 #ifdef HAVE_ZLIB
1071         compressor.Name == "gzip" ||
1072 #endif
1073 #ifdef HAVE_BZ2
1074         compressor.Name == "bzip2" ||
1075 #endif
1076         AutoClose == true))
1077       {
1078          close (iFd);
1079          iFd = -1;
1080       }
1081       return FileFdError(_("Could not open file descriptor %d"), Fd);
1082    }
1083    return true;
1084 }
1085 bool FileFd::OpenInternDescriptor(unsigned int const Mode, APT::Configuration::Compressor const &compressor)
1086 {
1087    if (compressor.Name == "." || compressor.Binary.empty() == true)
1088       return true;
1089
1090    if (d == NULL)
1091    {
1092       d = new FileFdPrivate();
1093       d->openmode = Mode;
1094       d->compressor = compressor;
1095    }
1096
1097 #ifdef HAVE_ZLIB
1098    if (compressor.Name == "gzip")
1099    {
1100       if (d->gz != NULL)
1101       {
1102          gzclose(d->gz);
1103          d->gz = NULL;
1104       }
1105       if ((Mode & ReadWrite) == ReadWrite)
1106          d->gz = gzdopen(iFd, "r+");
1107       else if ((Mode & WriteOnly) == WriteOnly)
1108          d->gz = gzdopen(iFd, "w");
1109       else
1110          d->gz = gzdopen(iFd, "r");
1111       if (d->gz == NULL)
1112          return false;
1113       Flags |= Compressed;
1114       return true;
1115    }
1116 #endif
1117 #ifdef HAVE_BZ2
1118    if (compressor.Name == "bzip2")
1119    {
1120       if (d->bz2 != NULL)
1121       {
1122          BZ2_bzclose(d->bz2);
1123          d->bz2 = NULL;
1124       }
1125       if ((Mode & ReadWrite) == ReadWrite)
1126          d->bz2 = BZ2_bzdopen(iFd, "r+");
1127       else if ((Mode & WriteOnly) == WriteOnly)
1128          d->bz2 = BZ2_bzdopen(iFd, "w");
1129       else
1130          d->bz2 = BZ2_bzdopen(iFd, "r");
1131       if (d->bz2 == NULL)
1132          return false;
1133       Flags |= Compressed;
1134       return true;
1135    }
1136 #endif
1137
1138    // collect zombies here in case we reopen
1139    if (d->compressor_pid > 0)
1140       ExecWait(d->compressor_pid, "FileFdCompressor", true);
1141
1142    if ((Mode & ReadWrite) == ReadWrite)
1143       return FileFdError("ReadWrite mode is not supported for file %s", FileName.c_str());
1144
1145    bool const Comp = (Mode & WriteOnly) == WriteOnly;
1146    if (Comp == false)
1147    {
1148       // Handle 'decompression' of empty files
1149       struct stat Buf;
1150       fstat(iFd, &Buf);
1151       if (Buf.st_size == 0 && S_ISFIFO(Buf.st_mode) == false)
1152          return true;
1153
1154       // We don't need the file open - instead let the compressor open it
1155       // as he properly knows better how to efficiently read from 'his' file
1156       if (FileName.empty() == false)
1157       {
1158          close(iFd);
1159          iFd = -1;
1160       }
1161    }
1162
1163    // Create a data pipe
1164    int Pipe[2] = {-1,-1};
1165    if (pipe(Pipe) != 0)
1166       return FileFdErrno("pipe",_("Failed to create subprocess IPC"));
1167    for (int J = 0; J != 2; J++)
1168       SetCloseExec(Pipe[J],true);
1169
1170    d->compressed_fd = iFd;
1171    d->pipe = true;
1172
1173    if (Comp == true)
1174       iFd = Pipe[1];
1175    else
1176       iFd = Pipe[0];
1177
1178    // The child..
1179    d->compressor_pid = ExecFork();
1180    if (d->compressor_pid == 0)
1181    {
1182       if (Comp == true)
1183       {
1184          dup2(d->compressed_fd,STDOUT_FILENO);
1185          dup2(Pipe[0],STDIN_FILENO);
1186       }
1187       else
1188       {
1189          if (FileName.empty() == true)
1190             dup2(d->compressed_fd,STDIN_FILENO);
1191          dup2(Pipe[1],STDOUT_FILENO);
1192       }
1193       int const nullfd = open("/dev/null", O_WRONLY);
1194       if (nullfd != -1)
1195       {
1196          dup2(nullfd,STDERR_FILENO);
1197          close(nullfd);
1198       }
1199
1200       SetCloseExec(STDOUT_FILENO,false);
1201       SetCloseExec(STDIN_FILENO,false);
1202
1203       std::vector<char const*> Args;
1204       Args.push_back(compressor.Binary.c_str());
1205       std::vector<std::string> const * const addArgs =
1206                 (Comp == true) ? &(compressor.CompressArgs) : &(compressor.UncompressArgs);
1207       for (std::vector<std::string>::const_iterator a = addArgs->begin();
1208            a != addArgs->end(); ++a)
1209          Args.push_back(a->c_str());
1210       if (Comp == false && FileName.empty() == false)
1211       {
1212          Args.push_back("--stdout");
1213          if (TemporaryFileName.empty() == false)
1214             Args.push_back(TemporaryFileName.c_str());
1215          else
1216             Args.push_back(FileName.c_str());
1217       }
1218       Args.push_back(NULL);
1219
1220       execvp(Args[0],(char **)&Args[0]);
1221       cerr << _("Failed to exec compressor ") << Args[0] << endl;
1222       _exit(100);
1223    }
1224    if (Comp == true)
1225       close(Pipe[0]);
1226    else
1227       close(Pipe[1]);
1228
1229    return true;
1230 }
1231                                                                         /*}}}*/
1232 // FileFd::~File - Closes the file                                      /*{{{*/
1233 // ---------------------------------------------------------------------
1234 /* If the proper modes are selected then we close the Fd and possibly
1235    unlink the file on error. */
1236 FileFd::~FileFd()
1237 {
1238    Close();
1239    if (d != NULL)
1240       d->CloseDown(FileName);
1241    delete d;
1242    d = NULL;
1243 }
1244                                                                         /*}}}*/
1245 // FileFd::Read - Read a bit of the file                                /*{{{*/
1246 // ---------------------------------------------------------------------
1247 /* We are carefull to handle interruption by a signal while reading
1248    gracefully. */
1249 bool FileFd::Read(void *To,unsigned long long Size,unsigned long long *Actual)
1250 {
1251    int Res;
1252    errno = 0;
1253    if (Actual != 0)
1254       *Actual = 0;
1255    *((char *)To) = '\0';
1256    do
1257    {
1258 #ifdef HAVE_ZLIB
1259       if (d != NULL && d->gz != NULL)
1260          Res = gzread(d->gz,To,Size);
1261       else
1262 #endif
1263 #ifdef HAVE_BZ2
1264       if (d != NULL && d->bz2 != NULL)
1265          Res = BZ2_bzread(d->bz2,To,Size);
1266       else
1267 #endif
1268          Res = read(iFd,To,Size);
1269
1270       if (Res < 0)
1271       {
1272          if (errno == EINTR)
1273             continue;
1274 #ifdef HAVE_ZLIB
1275          if (d != NULL && d->gz != NULL)
1276          {
1277             int err;
1278             char const * const errmsg = gzerror(d->gz, &err);
1279             if (err != Z_ERRNO)
1280                return FileFdError("gzread: %s (%d: %s)", _("Read error"), err, errmsg);
1281          }
1282 #endif
1283 #ifdef HAVE_BZ2
1284          if (d != NULL && d->bz2 != NULL)
1285          {
1286             int err;
1287             char const * const errmsg = BZ2_bzerror(d->bz2, &err);
1288             if (err != BZ_IO_ERROR)
1289                return FileFdError("BZ2_bzread: %s (%d: %s)", _("Read error"), err, errmsg);
1290          }
1291 #endif
1292          return FileFdErrno("read",_("Read error"));
1293       }
1294
1295       To = (char *)To + Res;
1296       Size -= Res;
1297       if (d != NULL)
1298          d->seekpos += Res;
1299       if (Actual != 0)
1300          *Actual += Res;
1301    }
1302    while (Res > 0 && Size > 0);
1303
1304    if (Size == 0)
1305       return true;
1306
1307    // Eof handling
1308    if (Actual != 0)
1309    {
1310       Flags |= HitEof;
1311       return true;
1312    }
1313
1314    return FileFdError(_("read, still have %llu to read but none left"), Size);
1315 }
1316                                                                         /*}}}*/
1317 // FileFd::ReadLine - Read a complete line from the file                /*{{{*/
1318 // ---------------------------------------------------------------------
1319 /* Beware: This method can be quiet slow for big buffers on UNcompressed
1320    files because of the naive implementation! */
1321 char* FileFd::ReadLine(char *To, unsigned long long const Size)
1322 {
1323    *To = '\0';
1324 #ifdef HAVE_ZLIB
1325    if (d != NULL && d->gz != NULL)
1326       return gzgets(d->gz, To, Size);
1327 #endif
1328
1329    unsigned long long read = 0;
1330    while ((Size - 1) != read)
1331    {
1332       unsigned long long done = 0;
1333       if (Read(To + read, 1, &done) == false)
1334          return NULL;
1335       if (done == 0)
1336          break;
1337       if (To[read++] == '\n')
1338          break;
1339    }
1340    if (read == 0)
1341       return NULL;
1342    To[read] = '\0';
1343    return To;
1344 }
1345                                                                         /*}}}*/
1346 // FileFd::Write - Write to the file                                    /*{{{*/
1347 // ---------------------------------------------------------------------
1348 /* */
1349 bool FileFd::Write(const void *From,unsigned long long Size)
1350 {
1351    int Res;
1352    errno = 0;
1353    do
1354    {
1355 #ifdef HAVE_ZLIB
1356       if (d != NULL && d->gz != NULL)
1357          Res = gzwrite(d->gz,From,Size);
1358       else
1359 #endif
1360 #ifdef HAVE_BZ2
1361       if (d != NULL && d->bz2 != NULL)
1362          Res = BZ2_bzwrite(d->bz2,(void*)From,Size);
1363       else
1364 #endif
1365          Res = write(iFd,From,Size);
1366       if (Res < 0 && errno == EINTR)
1367          continue;
1368       if (Res < 0)
1369       {
1370 #ifdef HAVE_ZLIB
1371          if (d != NULL && d->gz != NULL)
1372          {
1373             int err;
1374             char const * const errmsg = gzerror(d->gz, &err);
1375             if (err != Z_ERRNO)
1376                return FileFdError("gzwrite: %s (%d: %s)", _("Write error"), err, errmsg);
1377          }
1378 #endif
1379 #ifdef HAVE_BZ2
1380          if (d != NULL && d->bz2 != NULL)
1381          {
1382             int err;
1383             char const * const errmsg = BZ2_bzerror(d->bz2, &err);
1384             if (err != BZ_IO_ERROR)
1385                return FileFdError("BZ2_bzwrite: %s (%d: %s)", _("Write error"), err, errmsg);
1386          }
1387 #endif
1388          return FileFdErrno("write",_("Write error"));
1389       }
1390
1391       From = (char *)From + Res;
1392       Size -= Res;
1393       if (d != NULL)
1394          d->seekpos += Res;
1395    }
1396    while (Res > 0 && Size > 0);
1397
1398    if (Size == 0)
1399       return true;
1400
1401    return FileFdError(_("write, still have %llu to write but couldn't"), Size);
1402 }
1403 bool FileFd::Write(int Fd, const void *From, unsigned long long Size)
1404 {
1405    int Res;
1406    errno = 0;
1407    do
1408    {
1409       Res = write(Fd,From,Size);
1410       if (Res < 0 && errno == EINTR)
1411          continue;
1412       if (Res < 0)
1413          return _error->Errno("write",_("Write error"));
1414
1415       From = (char *)From + Res;
1416       Size -= Res;
1417    }
1418    while (Res > 0 && Size > 0);
1419
1420    if (Size == 0)
1421       return true;
1422
1423    return _error->Error(_("write, still have %llu to write but couldn't"), Size);
1424 }
1425                                                                         /*}}}*/
1426 // FileFd::Seek - Seek in the file                                      /*{{{*/
1427 // ---------------------------------------------------------------------
1428 /* */
1429 bool FileFd::Seek(unsigned long long To)
1430 {
1431    if (d != NULL && (d->pipe == true
1432 #ifdef HAVE_BZ2
1433                         || d->bz2 != NULL
1434 #endif
1435         ))
1436    {
1437       // Our poor man seeking in pipes is costly, so try to avoid it
1438       unsigned long long seekpos = Tell();
1439       if (seekpos == To)
1440          return true;
1441       else if (seekpos < To)
1442          return Skip(To - seekpos);
1443
1444       if ((d->openmode & ReadOnly) != ReadOnly)
1445          return FileFdError("Reopen is only implemented for read-only files!");
1446 #ifdef HAVE_BZ2
1447      if (d->bz2 != NULL)
1448      {
1449         BZ2_bzclose(d->bz2);
1450         d->bz2 = NULL;
1451      }
1452 #endif
1453       if (iFd != -1)
1454          close(iFd);
1455       iFd = -1;
1456       if (TemporaryFileName.empty() == false)
1457          iFd = open(TemporaryFileName.c_str(), O_RDONLY);
1458       else if (FileName.empty() == false)
1459          iFd = open(FileName.c_str(), O_RDONLY);
1460       else
1461       {
1462          if (d->compressed_fd > 0)
1463             if (lseek(d->compressed_fd, 0, SEEK_SET) != 0)
1464                iFd = d->compressed_fd;
1465          if (iFd < 0)
1466             return FileFdError("Reopen is not implemented for pipes opened with FileFd::OpenDescriptor()!");
1467       }
1468
1469       if (OpenInternDescriptor(d->openmode, d->compressor) == false)
1470          return FileFdError("Seek on file %s because it couldn't be reopened", FileName.c_str());
1471
1472       if (To != 0)
1473          return Skip(To);
1474
1475       d->seekpos = To;
1476       return true;
1477    }
1478    int res;
1479 #ifdef HAVE_ZLIB
1480    if (d != NULL && d->gz)
1481       res = gzseek(d->gz,To,SEEK_SET);
1482    else
1483 #endif
1484       res = lseek(iFd,To,SEEK_SET);
1485    if (res != (signed)To)
1486       return FileFdError("Unable to seek to %llu", To);
1487
1488    if (d != NULL)
1489       d->seekpos = To;
1490    return true;
1491 }
1492                                                                         /*}}}*/
1493 // FileFd::Skip - Seek in the file                                      /*{{{*/
1494 // ---------------------------------------------------------------------
1495 /* */
1496 bool FileFd::Skip(unsigned long long Over)
1497 {
1498    if (d != NULL && (d->pipe == true
1499 #ifdef HAVE_BZ2
1500                         || d->bz2 != NULL
1501 #endif
1502         ))
1503    {
1504       d->seekpos += Over;
1505       char buffer[1024];
1506       while (Over != 0)
1507       {
1508          unsigned long long toread = std::min((unsigned long long) sizeof(buffer), Over);
1509          if (Read(buffer, toread) == false)
1510             return FileFdError("Unable to seek ahead %llu",Over);
1511          Over -= toread;
1512       }
1513       return true;
1514    }
1515
1516    int res;
1517 #ifdef HAVE_ZLIB
1518    if (d != NULL && d->gz != NULL)
1519       res = gzseek(d->gz,Over,SEEK_CUR);
1520    else
1521 #endif
1522       res = lseek(iFd,Over,SEEK_CUR);
1523    if (res < 0)
1524       return FileFdError("Unable to seek ahead %llu",Over);
1525    if (d != NULL)
1526       d->seekpos = res;
1527
1528    return true;
1529 }
1530                                                                         /*}}}*/
1531 // FileFd::Truncate - Truncate the file                                 /*{{{*/
1532 // ---------------------------------------------------------------------
1533 /* */
1534 bool FileFd::Truncate(unsigned long long To)
1535 {
1536 #if defined HAVE_ZLIB || defined HAVE_BZ2
1537    if (d != NULL && (d->gz != NULL || d->bz2 != NULL))
1538       return FileFdError("Truncating compressed files is not implemented (%s)", FileName.c_str());
1539 #endif
1540    if (ftruncate(iFd,To) != 0)
1541       return FileFdError("Unable to truncate to %llu",To);
1542
1543    return true;
1544 }
1545                                                                         /*}}}*/
1546 // FileFd::Tell - Current seek position                                 /*{{{*/
1547 // ---------------------------------------------------------------------
1548 /* */
1549 unsigned long long FileFd::Tell()
1550 {
1551    // In theory, we could just return seekpos here always instead of
1552    // seeking around, but not all users of FileFd use always Seek() and co
1553    // so d->seekpos isn't always true and we can just use it as a hint if
1554    // we have nothing else, but not always as an authority…
1555    if (d != NULL && (d->pipe == true
1556 #ifdef HAVE_BZ2
1557                         || d->bz2 != NULL
1558 #endif
1559         ))
1560       return d->seekpos;
1561
1562    off_t Res;
1563 #ifdef HAVE_ZLIB
1564    if (d != NULL && d->gz != NULL)
1565      Res = gztell(d->gz);
1566    else
1567 #endif
1568      Res = lseek(iFd,0,SEEK_CUR);
1569    if (Res == (off_t)-1)
1570       FileFdErrno("lseek","Failed to determine the current file position");
1571    if (d != NULL)
1572       d->seekpos = Res;
1573    return Res;
1574 }
1575                                                                         /*}}}*/
1576 // FileFd::FileSize - Return the size of the file                       /*{{{*/
1577 // ---------------------------------------------------------------------
1578 /* */
1579 unsigned long long FileFd::FileSize()
1580 {
1581    struct stat Buf;
1582    if ((d == NULL || d->pipe == false) && fstat(iFd,&Buf) != 0)
1583       return FileFdErrno("fstat","Unable to determine the file size");
1584
1585    // for compressor pipes st_size is undefined and at 'best' zero
1586    if ((d != NULL && d->pipe == true) || S_ISFIFO(Buf.st_mode))
1587    {
1588       // we set it here, too, as we get the info here for free
1589       // in theory the Open-methods should take care of it already
1590       if (d != NULL)
1591          d->pipe = true;
1592       if (stat(FileName.c_str(), &Buf) != 0)
1593          return FileFdErrno("stat","Unable to determine the file size");
1594    }
1595
1596    return Buf.st_size;
1597 }
1598                                                                         /*}}}*/
1599 // FileFd::Size - Return the size of the content in the file            /*{{{*/
1600 // ---------------------------------------------------------------------
1601 /* */
1602 unsigned long long FileFd::Size()
1603 {
1604    unsigned long long size = FileSize();
1605
1606    // for compressor pipes st_size is undefined and at 'best' zero,
1607    // so we 'read' the content and 'seek' back - see there
1608    if (d != NULL && (d->pipe == true
1609 #ifdef HAVE_BZ2
1610                         || (d->bz2 && size > 0)
1611 #endif
1612         ))
1613    {
1614       unsigned long long const oldSeek = Tell();
1615       char ignore[1000];
1616       unsigned long long read = 0;
1617       do {
1618          if (Read(ignore, sizeof(ignore), &read) == false)
1619          {
1620             Seek(oldSeek);
1621             return 0;
1622          }
1623       } while(read != 0);
1624       size = Tell();
1625       Seek(oldSeek);
1626    }
1627 #ifdef HAVE_ZLIB
1628    // only check gzsize if we are actually a gzip file, just checking for
1629    // "gz" is not sufficient as uncompressed files could be opened with
1630    // gzopen in "direct" mode as well
1631    else if (d != NULL && d->gz && !gzdirect(d->gz) && size > 0)
1632    {
1633        off_t const oldPos = lseek(iFd,0,SEEK_CUR);
1634        /* unfortunately zlib.h doesn't provide a gzsize(), so we have to do
1635         * this ourselves; the original (uncompressed) file size is the last 32
1636         * bits of the file */
1637        // FIXME: Size for gz-files is limited by 32bit… no largefile support
1638        if (lseek(iFd, -4, SEEK_END) < 0)
1639        {
1640           FileFdErrno("lseek","Unable to seek to end of gzipped file");
1641           return 0;
1642        }
1643        size = 0;
1644        if (read(iFd, &size, 4) != 4)
1645        {
1646           FileFdErrno("read","Unable to read original size of gzipped file");
1647           return 0;
1648        }
1649
1650 #ifdef WORDS_BIGENDIAN
1651        uint32_t tmp_size = size;
1652        uint8_t const * const p = (uint8_t const * const) &tmp_size;
1653        tmp_size = (p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0];
1654        size = tmp_size;
1655 #endif
1656
1657        if (lseek(iFd, oldPos, SEEK_SET) < 0)
1658        {
1659           FileFdErrno("lseek","Unable to seek in gzipped file");
1660           return 0;
1661        }
1662
1663        return size;
1664    }
1665 #endif
1666
1667    return size;
1668 }
1669                                                                         /*}}}*/
1670 // FileFd::ModificationTime - Return the time of last touch             /*{{{*/
1671 // ---------------------------------------------------------------------
1672 /* */
1673 time_t FileFd::ModificationTime()
1674 {
1675    struct stat Buf;
1676    if ((d == NULL || d->pipe == false) && fstat(iFd,&Buf) != 0)
1677    {
1678       FileFdErrno("fstat","Unable to determine the modification time of file %s", FileName.c_str());
1679       return 0;
1680    }
1681
1682    // for compressor pipes st_size is undefined and at 'best' zero
1683    if ((d != NULL && d->pipe == true) || S_ISFIFO(Buf.st_mode))
1684    {
1685       // we set it here, too, as we get the info here for free
1686       // in theory the Open-methods should take care of it already
1687       if (d != NULL)
1688          d->pipe = true;
1689       if (stat(FileName.c_str(), &Buf) != 0)
1690       {
1691          FileFdErrno("fstat","Unable to determine the modification time of file %s", FileName.c_str());
1692          return 0;
1693       }
1694    }
1695
1696    return Buf.st_mtime;
1697 }
1698                                                                         /*}}}*/
1699 // FileFd::Close - Close the file if the close flag is set              /*{{{*/
1700 // ---------------------------------------------------------------------
1701 /* */
1702 bool FileFd::Close()
1703 {
1704    if (iFd == -1)
1705       return true;
1706
1707    bool Res = true;
1708    if ((Flags & AutoClose) == AutoClose)
1709    {
1710       if ((Flags & Compressed) != Compressed && iFd > 0 && close(iFd) != 0)
1711          Res &= _error->Errno("close",_("Problem closing the file %s"), FileName.c_str());
1712
1713       if (d != NULL)
1714       {
1715          Res &= d->CloseDown(FileName);
1716          delete d;
1717          d = NULL;
1718       }
1719    }
1720
1721    if ((Flags & Replace) == Replace) {
1722       if (rename(TemporaryFileName.c_str(), FileName.c_str()) != 0)
1723          Res &= _error->Errno("rename",_("Problem renaming the file %s to %s"), TemporaryFileName.c_str(), FileName.c_str());
1724
1725       FileName = TemporaryFileName; // for the unlink() below.
1726       TemporaryFileName.clear();
1727    }
1728
1729    iFd = -1;
1730
1731    if ((Flags & Fail) == Fail && (Flags & DelOnFail) == DelOnFail &&
1732        FileName.empty() == false)
1733       if (unlink(FileName.c_str()) != 0)
1734          Res &= _error->WarningE("unlnk",_("Problem unlinking the file %s"), FileName.c_str());
1735
1736    if (Res == false)
1737       Flags |= Fail;
1738    return Res;
1739 }
1740                                                                         /*}}}*/
1741 // FileFd::Sync - Sync the file                                         /*{{{*/
1742 // ---------------------------------------------------------------------
1743 /* */
1744 bool FileFd::Sync()
1745 {
1746    if (fsync(iFd) != 0)
1747       return FileFdErrno("sync",_("Problem syncing the file"));
1748    return true;
1749 }
1750                                                                         /*}}}*/
1751 // FileFd::FileFdErrno - set Fail and call _error->Errno                *{{{*/
1752 bool FileFd::FileFdErrno(const char *Function, const char *Description,...)
1753 {
1754    Flags |= Fail;
1755    va_list args;
1756    size_t msgSize = 400;
1757    int const errsv = errno;
1758    while (true)
1759    {
1760       va_start(args,Description);
1761       if (_error->InsertErrno(GlobalError::ERROR, Function, Description, args, errsv, msgSize) == false)
1762          break;
1763       va_end(args);
1764    }
1765    return false;
1766 }
1767                                                                         /*}}}*/
1768 // FileFd::FileFdError - set Fail and call _error->Error                *{{{*/
1769 bool FileFd::FileFdError(const char *Description,...) {
1770    Flags |= Fail;
1771    va_list args;
1772    size_t msgSize = 400;
1773    while (true)
1774    {
1775       va_start(args,Description);
1776       if (_error->Insert(GlobalError::ERROR, Description, args, msgSize) == false)
1777          break;
1778       va_end(args);
1779    }
1780    return false;
1781 }
1782                                                                         /*}}}*/
1783
1784 gzFile FileFd::gzFd() { return (gzFile) d->gz; }
1785
1786
1787 // Glob - wrapper around "glob()"                                      /*{{{*/
1788 // ---------------------------------------------------------------------
1789 /* */
1790 std::vector<std::string> Glob(std::string const &pattern, int flags)
1791 {
1792    std::vector<std::string> result;
1793    glob_t globbuf;
1794    int glob_res;
1795    unsigned int i;
1796
1797    glob_res = glob(pattern.c_str(),  flags, NULL, &globbuf);
1798
1799    if (glob_res != 0)
1800    {
1801       if(glob_res != GLOB_NOMATCH) {
1802          _error->Errno("glob", "Problem with glob");
1803          return result;
1804       }
1805    }
1806
1807    // append results
1808    for(i=0;i<globbuf.gl_pathc;i++)
1809       result.push_back(string(globbuf.gl_pathv[i]));
1810
1811    globfree(&globbuf);
1812    return result;
1813 }
1814                                                                         /*}}}*/