pkgutil.cc

   1 //
   2 //  pkgutils
   3 //
   4 //  Copyright (c) 2000-2005 Per Liden
   5 //
   6 //  This program is free software; you can redistribute it and/or modify
   7 //  it under the terms of the GNU General Public License as published by
   8 //  the Free Software Foundation; either version 2 of the License, or
   9 //  (at your option) any later version.
  10 //
  11 //  This program is distributed in the hope that it will be useful,
  12 //  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 //  GNU General Public License for more details.
  15 //
  16 //  You should have received a copy of the GNU General Public License
  17 //  along with this program; if not, write to the Free Software
  18 //  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  19 //  USA.
  20 //
  21
  22 #include "pkgutil.h"
  23 #include <iostream>
  24 #include <fstream>
  25 #include <iterator>
  26 #include <algorithm>
  27 #include <cstdio>
  28 #include <cstring>
  29 #include <cerrno>
  30 #include <csignal>
  31 #include <ext/stdio_filebuf.h>
  32 #include <pwd.h>
  33 #include <grp.h>
  34 #include <sys/types.h>
  35 #include <sys/stat.h>
  36 #include <sys/wait.h>
  37 #include <sys/file.h>
  38 #include <sys/param.h>
  39 #include <unistd.h>
  40 #include <fcntl.h>
  41 #include <zlib.h>
  42 #include <libgen.h>
  43 #include <archive.h>
  44 #include <archive_entry.h>
  45
  46 using __gnu_cxx::stdio_filebuf;
  47
  48 pkgutil::pkgutil(const string& name)
  49         : utilname(name)
  50 {
  51         // Ignore signals
  52         struct sigaction sa;
  53         memset(&sa, 0, sizeof(sa));
  54         sa.sa_handler = SIG_IGN;
  55         sigaction(SIGHUP, &sa, 0);
  56         sigaction(SIGINT, &sa, 0);
  57         sigaction(SIGQUIT, &sa, 0);
  58         sigaction(SIGTERM, &sa, 0);
  59 }
  60
  61 void pkgutil::db_open(const string& path)
  62 {
  63         // Read database
  64         root = trim_filename(path + "/");
  65         const string filename = root + PKG_DB;
  66
  67         int fd = open(filename.c_str(), O_RDONLY);
  68         if (fd == -1)
  69                 throw runtime_error_with_errno("could not open " + filename);
  70
  71         stdio_filebuf<char> filebuf(fd, ios::in, getpagesize());
  72         istream in(&filebuf);
  73         if (!in)
  74                 throw runtime_error_with_errno("could not read " + filename);
  75
  76         while (!in.eof()) {
  77                 // Read record
  78                 string name;
  79                 pkginfo_t info;
  80                 getline(in, name);
  81                 getline(in, info.version);
  82                 for (;;) {
  83                         string file;
  84                         getline(in, file);
  85
  86                         if (file.empty())
  87                                 break; // End of record
  88
  89                         info.files.insert(info.files.end(), file);
  90                 }
  91                 if (!info.files.empty())
  92                         packages[name] = info;
  93         }
  94
  95 #ifndef NDEBUG
  96         cerr << packages.size() << " packages found in database" << endl;
  97 #endif
  98 }
  99
 100 void pkgutil::db_commit()
 101 {
 102         const string dbfilename = root + PKG_DB;
 103         const string dbfilename_new = dbfilename + ".incomplete_transaction";
 104         const string dbfilename_bak = dbfilename + ".backup";
 105
 106         // Remove failed transaction (if it exists)
 107         if (unlink(dbfilename_new.c_str()) == -1 && errno != ENOENT)
 108                 throw runtime_error_with_errno("could not remove " + dbfilename_new);
 109
 110         // Write new database
 111         int fd_new = creat(dbfilename_new.c_str(), 0444);
 112         if (fd_new == -1)
 113                 throw runtime_error_with_errno("could not create " + dbfilename_new);
 114
 115         stdio_filebuf<char> filebuf_new(fd_new, ios::out, getpagesize());
 116         ostream db_new(&filebuf_new);
 117         for (packages_t::const_iterator i = packages.begin(); i != packages.end(); ++i) {
 118                 if (!i->second.files.empty()) {
 119                         db_new << i->first << "\n";
 120                         db_new << i->second.version << "\n";
 121                         copy(i->second.files.begin(), i->second.files.end(), ostream_iterator<string>(db_new, "\n"));
 122                         db_new << "\n";
 123                 }
 124         }
 125
 126         db_new.flush();
 127
 128         // Make sure the new database was successfully written
 129         if (!db_new)
 130                 throw runtime_error("could not write " + dbfilename_new);
 131
 132         // Synchronize file to disk
 133         if (fsync(fd_new) == -1)
 134                 throw runtime_error_with_errno("could not synchronize " + dbfilename_new);
 135
 136         // Relink database backup
 137         if (unlink(dbfilename_bak.c_str()) == -1 && errno != ENOENT)
 138                 throw runtime_error_with_errno("could not remove " + dbfilename_bak);
 139         if (link(dbfilename.c_str(), dbfilename_bak.c_str()) == -1)
 140                 throw runtime_error_with_errno("could not create " + dbfilename_bak);
 141
 142         // Move new database into place
 143         if (rename(dbfilename_new.c_str(), dbfilename.c_str()) == -1)
 144                 throw runtime_error_with_errno("could not rename " + dbfilename_new + " to " + dbfilename);
 145
 146 #ifndef NDEBUG
 147         cerr << packages.size() << " packages written to database" << endl;
 148 #endif
 149 }
 150
 151 void pkgutil::db_add_pkg(const string& name, const pkginfo_t& info)
 152 {
 153         packages[name] = info;
 154 }
 155
 156 bool pkgutil::db_find_pkg(const string& name)
 157 {
 158         return (packages.find(name) != packages.end());
 159 }
 160
 161 void pkgutil::db_rm_pkg(const string& name)
 162 {
 163         set<string> files = packages[name].files;
 164         packages.erase(name);
 165
 166 #ifndef NDEBUG
 167         cerr << "Removing package phase 1 (all files in package):" << endl;
 168         copy(files.begin(), files.end(), ostream_iterator<string>(cerr, "\n"));
 169         cerr << endl;
 170 #endif
 171
 172         // Don't delete files that still have references
 173         for (packages_t::const_iterator i = packages.begin(); i != packages.end(); ++i)
 174                 for (set<string>::const_iterator j = i->second.files.begin(); j != i->second.files.end(); ++j)
 175                         files.erase(*j);
 176
 177 #ifndef NDEBUG
 178         cerr << "Removing package phase 2 (files that still have references excluded):" << endl;
 179         copy(files.begin(), files.end(), ostream_iterator<string>(cerr, "\n"));
 180         cerr << endl;
 181 #endif
 182
 183         // Delete the files
 184         for (set<string>::const_reverse_iterator i = files.rbegin(); i != files.rend(); ++i) {
 185                 const string filename = root + *i;
 186                 if (file_exists(filename) && remove(filename.c_str()) == -1) {
 187                         const char* msg = strerror(errno);
 188                         cerr << utilname << ": could not remove " << filename << ": " << msg << endl;
 189                 }
 190         }
 191 }
 192
 193 void pkgutil::db_rm_pkg(const string& name, const set<string>& keep_list)
 194 {
 195         set<string> files = packages[name].files;
 196         packages.erase(name);
 197
 198 #ifndef NDEBUG
 199         cerr << "Removing package phase 1 (all files in package):" << endl;
 200         copy(files.begin(), files.end(), ostream_iterator<string>(cerr, "\n"));
 201         cerr << endl;
 202 #endif
 203
 204         // Don't delete files found in the keep list
 205         for (set<string>::const_iterator i = keep_list.begin(); i != keep_list.end(); ++i)
 206                 files.erase(*i);
 207
 208 #ifndef NDEBUG
 209         cerr << "Removing package phase 2 (files that is in the keep list excluded):" << endl;
 210         copy(files.begin(), files.end(), ostream_iterator<string>(cerr, "\n"));
 211         cerr << endl;
 212 #endif
 213
 214         // Don't delete files that still have references
 215         for (packages_t::const_iterator i = packages.begin(); i != packages.end(); ++i)
 216                 for (set<string>::const_iterator j = i->second.files.begin(); j != i->second.files.end(); ++j)
 217                         files.erase(*j);
 218
 219 #ifndef NDEBUG
 220         cerr << "Removing package phase 3 (files that still have references excluded):" << endl;
 221         copy(files.begin(), files.end(), ostream_iterator<string>(cerr, "\n"));
 222         cerr << endl;
 223 #endif
 224
 225         // Delete the files
 226         for (set<string>::const_reverse_iterator i = files.rbegin(); i != files.rend(); ++i) {
 227                 const string filename = root + *i;
 228                 if (file_exists(filename) && remove(filename.c_str()) == -1) {
 229                         if (errno == ENOTEMPTY)
 230                                 continue;
 231                         const char* msg = strerror(errno);
 232                         cerr << utilname << ": could not remove " << filename << ": " << msg << endl;
 233                 }
 234         }
 235 }
 236
 237 void pkgutil::db_rm_files(set<string> files, const set<string>& keep_list)
 238 {
 239         // Remove all references
 240         for (packages_t::iterator i = packages.begin(); i != packages.end(); ++i)
 241                 for (set<string>::const_iterator j = files.begin(); j != files.end(); ++j)
 242                         i->second.files.erase(*j);
 243
 244 #ifndef NDEBUG
 245         cerr << "Removing files:" << endl;
 246         copy(files.begin(), files.end(), ostream_iterator<string>(cerr, "\n"));
 247         cerr << endl;
 248 #endif
 249
 250         // Don't delete files found in the keep list
 251         for (set<string>::const_iterator i = keep_list.begin(); i != keep_list.end(); ++i)
 252                 files.erase(*i);
 253
 254         // Delete the files
 255         for (set<string>::const_reverse_iterator i = files.rbegin(); i != files.rend(); ++i) {
 256                 const string filename = root + *i;
 257                 if (file_exists(filename) && remove(filename.c_str()) == -1) {
 258                         if (errno == ENOTEMPTY)
 259                                 continue;
 260                         const char* msg = strerror(errno);
 261                         cerr << utilname << ": could not remove " << filename << ": " << msg << endl;
 262                 }
 263         }
 264 }
 265
 266 set<string> pkgutil::db_find_conflicts(const string& name, const pkginfo_t& info)
 267 {
 268         set<string> files;
 269
 270         // Find conflicting files in database
 271         for (packages_t::const_iterator i = packages.begin(); i != packages.end(); ++i) {
 272                 if (i->first != name) {
 273                         set_intersection(info.files.begin(), info.files.end(),
 274                                          i->second.files.begin(), i->second.files.end(),
 275                                          inserter(files, files.end()));
 276                 }
 277         }
 278
 279 #ifndef NDEBUG
 280         cerr << "Conflicts phase 1 (conflicts in database):" << endl;
 281         copy(files.begin(), files.end(), ostream_iterator<string>(cerr, "\n"));
 282         cerr << endl;
 283 #endif
 284
 285         // Find conflicting files in filesystem
 286         for (set<string>::iterator i = info.files.begin(); i != info.files.end(); ++i) {
 287                 const string filename = root + *i;
 288                 if (file_exists(filename) && files.find(*i) == files.end())
 289                         files.insert(files.end(), *i);
 290         }
 291
 292 #ifndef NDEBUG
 293         cerr << "Conflicts phase 2 (conflicts in filesystem added):" << endl;
 294         copy(files.begin(), files.end(), ostream_iterator<string>(cerr, "\n"));
 295         cerr << endl;
 296 #endif
 297
 298         // Exclude directories
 299         set<string> tmp = files;
 300         for (set<string>::const_iterator i = tmp.begin(); i != tmp.end(); ++i) {
 301                 if ((*i)[i->length() - 1] == '/')
 302                         files.erase(*i);
 303         }
 304
 305 #ifndef NDEBUG
 306         cerr << "Conflicts phase 3 (directories excluded):" << endl;
 307         copy(files.begin(), files.end(), ostream_iterator<string>(cerr, "\n"));
 308         cerr << endl;
 309 #endif
 310
 311         // If this is an upgrade, remove files already owned by this package
 312         if (packages.find(name) != packages.end()) {
 313                 for (set<string>::const_iterator i = packages[name].files.begin(); i != packages[name].files.end(); ++i)
 314                         files.erase(*i);
 315
 316 #ifndef NDEBUG
 317                 cerr << "Conflicts phase 4 (files already owned by this package excluded):" << endl;
 318                 copy(files.begin(), files.end(), ostream_iterator<string>(cerr, "\n"));
 319                 cerr << endl;
 320 #endif
 321         }
 322
 323         return files;
 324 }
 325
 326 pair<string, pkgutil::pkginfo_t> pkgutil::pkg_open(const string& filename) const
 327 {
 328         pair<string, pkginfo_t> result;
 329         unsigned int i;
 330         struct archive* archive;
 331         struct archive_entry* entry;
 332
 333         // Extract name and version from filename
 334         string basename(filename, filename.rfind('/') + 1);
 335         string name(basename, 0, basename.find(VERSION_DELIM));
 336         string version(basename, 0, basename.rfind(PKG_EXT));
 337         version.erase(0, version.find(VERSION_DELIM) == string::npos ? string::npos : version.find(VERSION_DELIM) + 1);
 338
 339         if (name.empty() || version.empty())
 340                 throw runtime_error("could not determine name and/or version of " + basename + ": Invalid package name");
 341
 342         result.first = name;
 343         result.second.version = version;
 344
 345         archive = archive_read_new();
 346         archive_read_support_compression_all(archive);
 347         archive_read_support_format_all(archive);
 348
 349         if (archive_read_open_filename(archive,
 350             const_cast<char*>(filename.c_str()),
 351             ARCHIVE_DEFAULT_BYTES_PER_BLOCK) != ARCHIVE_OK)
 352                 throw runtime_error_with_errno("could not open " + filename, archive_errno(archive));
 353
 354         for (i = 0; archive_read_next_header(archive, &entry) ==
 355              ARCHIVE_OK; ++i) {
 356
 357                 result.second.files.insert(result.second.files.end(),
 358                                            archive_entry_pathname(entry));
 359
 360                 mode_t mode = archive_entry_mode(entry);
 361
 362                 if (S_ISREG(mode) &&
 363                     archive_read_data_skip(archive) != ARCHIVE_OK)
 364                         throw runtime_error_with_errno("could not read " + filename, archive_errno(archive));
 365         }
 366
 367         if (i == 0) {
 368                 if (archive_errno(archive) == 0)
 369                         throw runtime_error("empty package");
 370                 else
 371                         throw runtime_error("could not read " + filename);
 372         }
 373
 374         archive_read_finish(archive);
 375
 376         return result;
 377 }
 378
 379 void pkgutil::pkg_install(const string& filename, const set<string>& keep_list, const set<string>& non_install_list) const
 380 {
 381         struct archive* archive;
 382         struct archive_entry* entry;
 383         unsigned int i;
 384
 385         archive = archive_read_new();
 386         archive_read_support_compression_all(archive);
 387         archive_read_support_format_all(archive);
 388
 389         if (archive_read_open_filename(archive,
 390             const_cast<char*>(filename.c_str()),
 391             ARCHIVE_DEFAULT_BYTES_PER_BLOCK) != ARCHIVE_OK)
 392                 throw runtime_error_with_errno("could not open " + filename, archive_errno(archive));
 393
 394         chdir(root.c_str());
 395
 396         for (i = 0; archive_read_next_header(archive, &entry) ==
 397              ARCHIVE_OK; ++i) {
 398                 string archive_filename = archive_entry_pathname(entry);
 399                 string reject_dir = trim_filename(root + string("/") + string(PKG_REJECTED));
 400                 string original_filename = trim_filename(root + string("/") + archive_filename);
 401                 string real_filename = original_filename;
 402
 403                 // Check if file is filtered out via INSTALL
 404                 if (non_install_list.find(archive_filename) != non_install_list.end()) {
 405                         mode_t mode;
 406
 407                         cout << utilname << ": ignoring " << archive_filename << endl;
 408
 409                         mode = archive_entry_mode(entry);
 410
 411                         if (S_ISREG(mode))
 412                                 archive_read_data_skip(archive);
 413
 414                         continue;
 415                 }
 416
 417                 // Check if file should be rejected
 418                 if (file_exists(real_filename) && keep_list.find(archive_filename) != keep_list.end())
 419                         real_filename = trim_filename(reject_dir + string("/") + archive_filename);
 420
 421                 archive_entry_set_pathname(entry, const_cast<char*>
 422                                            (real_filename.c_str()));
 423
 424                 // Extract file
 425                 if (archive_read_extract(archive, entry, 0) !=
 426                     ARCHIVE_OK) {
 427                         // If a file fails to install we just print an error message and
 428                         // continue trying to install the rest of the package.
 429                         const char* msg = archive_error_string(archive);
 430                         cerr << utilname << ": could not install " + archive_filename << ": " << msg << endl;
 431                         continue;
 432                 }
 433
 434                 // Check rejected file
 435                 if (real_filename != original_filename) {
 436                         bool remove_file = false;
 437                         mode_t mode = archive_entry_mode(entry);
 438
 439                         // Directory
 440                         if (S_ISDIR(mode))
 441                                 remove_file = permissions_equal(real_filename, original_filename);
 442                         // Other files
 443                         else
 444                                 remove_file = permissions_equal(real_filename, original_filename) &&
 445                                         (file_empty(real_filename) || file_equal(real_filename, original_filename));
 446
 447                         // Remove rejected file or signal about its existence
 448                         if (remove_file)
 449                                 file_remove(reject_dir, real_filename);
 450                         else
 451                                 cout << utilname << ": rejecting " << archive_filename << ", keeping existing version" << endl;
 452                 }
 453         }
 454
 455         if (i == 0) {
 456                 if (archive_errno(archive) == 0)
 457                         throw runtime_error("empty package");
 458                 else
 459                         throw runtime_error("could not read " + filename);
 460         }
 461
 462         archive_read_finish(archive);
 463 }
 464
 465 void pkgutil::ldconfig() const
 466 {
 467         // Only execute ldconfig if /etc/ld.so.conf exists
 468         if (file_exists(root + LDCONFIG_CONF)) {
 469                 pid_t pid = fork();
 470
 471                 if (pid == -1)
 472                         throw runtime_error_with_errno("fork() failed");
 473
 474                 if (pid == 0) {
 475                         execl(LDCONFIG, LDCONFIG, "-r", root.c_str(), (char *) 0);
 476                         const char* msg = strerror(errno);
 477                         cerr << utilname << ": could not execute " << LDCONFIG << ": " << msg << endl;
 478                         exit(EXIT_FAILURE);
 479                 } else {
 480                         if (waitpid(pid, 0, 0) == -1)
 481                                 throw runtime_error_with_errno("waitpid() failed");
 482                 }
 483         }
 484 }
 485
 486 void pkgutil::pkg_footprint(string& filename) const
 487 {
 488         unsigned int i;
 489         struct archive* archive;
 490         struct archive_entry* entry;
 491
 492         map<string, mode_t> hardlink_target_modes;
 493
 494         // We first do a run over the archive and remember the modes
 495         // of regular files.
 496         // In the second run, we print the footprint - using the stored
 497         // modes for hardlinks.
 498         //
 499         // FIXME the code duplication here is butt ugly
 500         archive = archive_read_new();
 501         archive_read_support_compression_all(archive);
 502         archive_read_support_format_all(archive);
 503
 504         if (archive_read_open_filename(archive,
 505             const_cast<char*>(filename.c_str()),
 506             ARCHIVE_DEFAULT_BYTES_PER_BLOCK) != ARCHIVE_OK)
 507                 throw runtime_error_with_errno("could not open " + filename, archive_errno(archive));
 508
 509         for (i = 0; archive_read_next_header(archive, &entry) ==
 510              ARCHIVE_OK; ++i) {
 511
 512                 mode_t mode = archive_entry_mode(entry);
 513
 514                 if (!archive_entry_hardlink(entry)) {
 515                         const char *s = archive_entry_pathname(entry);
 516
 517                         hardlink_target_modes[s] = mode;
 518                 }
 519
 520                 if (S_ISREG(mode) && archive_read_data_skip(archive))
 521                         throw runtime_error_with_errno("could not read " + filename, archive_errno(archive));
 522         }
 523
 524         archive_read_finish(archive);
 525
 526         // Too bad, there doesn't seem to be a way to reuse our archive
 527         // instance
 528         archive = archive_read_new();
 529         archive_read_support_compression_all(archive);
 530         archive_read_support_format_all(archive);
 531
 532         if (archive_read_open_filename(archive,
 533             const_cast<char*>(filename.c_str()),
 534             ARCHIVE_DEFAULT_BYTES_PER_BLOCK) != ARCHIVE_OK)
 535                 throw runtime_error_with_errno("could not open " + filename, archive_errno(archive));
 536
 537         for (i = 0; archive_read_next_header(archive, &entry) ==
 538              ARCHIVE_OK; ++i) {
 539                 mode_t mode = archive_entry_mode(entry);
 540
 541                 // Access permissions
 542                 if (S_ISLNK(mode)) {
 543                         // Access permissions on symlinks differ among filesystems, e.g. XFS and ext2 have different.
 544                         // To avoid getting different footprints we always use "lrwxrwxrwx".
 545                         cout << "lrwxrwxrwx";
 546                 } else {
 547                         const char *h = archive_entry_hardlink(entry);
 548
 549                         if (h)
 550                                 cout << mtos(hardlink_target_modes[h]);
 551                         else
 552                                 cout << mtos(mode);
 553                 }
 554
 555                 cout << '\t';
 556
 557                 // User
 558                 uid_t uid = archive_entry_uid(entry);
 559                 struct passwd* pw = getpwuid(uid);
 560                 if (pw)
 561                         cout << pw->pw_name;
 562                 else
 563                         cout << uid;
 564
 565                 cout << '/';
 566
 567                 // Group
 568                 gid_t gid = archive_entry_gid(entry);
 569                 struct group* gr = getgrgid(gid);
 570                 if (gr)
 571                         cout << gr->gr_name;
 572                 else
 573                         cout << gid;
 574
 575                 // Filename
 576                 cout << '\t' << archive_entry_pathname(entry);
 577
 578                 // Special cases
 579                 if (S_ISLNK(mode)) {
 580                         // Symlink
 581                         cout << " -> " << archive_entry_symlink(entry);
 582                 } else if (S_ISCHR(mode) ||
 583                            S_ISBLK(mode)) {
 584                         // Device
 585                         cout << " (" << archive_entry_rdevmajor(entry)
 586                              << ", " << archive_entry_rdevminor(entry)
 587                              << ")";
 588                 } else if (S_ISREG(mode) &&
 589                            archive_entry_size(entry) == 0) {
 590                         // Empty regular file
 591                         cout << " (EMPTY)";
 592                 }
 593
 594                 cout << '\n';
 595
 596                 if (S_ISREG(mode) && archive_read_data_skip(archive))
 597                         throw runtime_error_with_errno("could not read " + filename, archive_errno(archive));
 598         }
 599
 600         if (i == 0) {
 601                 if (archive_errno(archive) == 0)
 602                         throw runtime_error("empty package");
 603                 else
 604                         throw runtime_error("could not read " + filename);
 605         }
 606
 607         archive_read_finish(archive);
 608 }
 609
 610 void pkgutil::print_version() const
 611 {
 612         cout << utilname << " (pkgutils) " << VERSION << endl;
 613 }
 614
 615 db_lock::db_lock(const string& root, bool exclusive)
 616         : dir(0)
 617 {
 618         const string dirname = trim_filename(root + string("/") + PKG_DIR);
 619
 620         if (!(dir = opendir(dirname.c_str())))
 621                 throw runtime_error_with_errno("could not read directory " + dirname);
 622
 623         if (flock(dirfd(dir), (exclusive ? LOCK_EX : LOCK_SH) | LOCK_NB) == -1) {
 624                 if (errno == EWOULDBLOCK)
 625                         throw runtime_error("package database is currently locked by another process");
 626                 else
 627                         throw runtime_error_with_errno("could not lock directory " + dirname);
 628         }
 629 }
 630
 631 db_lock::~db_lock()
 632 {
 633         if (dir) {
 634                 flock(dirfd(dir), LOCK_UN);
 635                 closedir(dir);
 636         }
 637 }
 638
 639 void assert_argument(char** argv, int argc, int index)
 640 {
 641         if (argc - 1 < index + 1)
 642                 throw runtime_error("option " + string(argv[index]) + " requires an argument");
 643 }
 644
 645 string itos(unsigned int value)
 646 {
 647         static char buf[20];
 648         sprintf(buf, "%u", value);
 649         return buf;
 650 }
 651
 652 string mtos(mode_t mode)
 653 {
 654         string s;
 655
 656         // File type
 657         switch (mode & S_IFMT) {
 658         case S_IFREG:  s += '-'; break; // Regular
 659         case S_IFDIR:  s += 'd'; break; // Directory
 660         case S_IFLNK:  s += 'l'; break; // Symbolic link
 661         case S_IFCHR:  s += 'c'; break; // Character special
 662         case S_IFBLK:  s += 'b'; break; // Block special
 663         case S_IFSOCK: s += 's'; break; // Socket
 664         case S_IFIFO:  s += 'p'; break; // Fifo
 665         default:       s += '?'; break; // Unknown
 666         }
 667
 668         // User permissions
 669         s += (mode & S_IRUSR) ? 'r' : '-';
 670         s += (mode & S_IWUSR) ? 'w' : '-';
 671         switch (mode & (S_IXUSR | S_ISUID)) {
 672         case S_IXUSR:           s += 'x'; break;
 673         case S_ISUID:           s += 'S'; break;
 674         case S_IXUSR | S_ISUID: s += 's'; break;
 675         default:                s += '-'; break;
 676         }
 677
 678         // Group permissions
 679         s += (mode & S_IRGRP) ? 'r' : '-';
 680         s += (mode & S_IWGRP) ? 'w' : '-';
 681         switch (mode & (S_IXGRP | S_ISGID)) {
 682         case S_IXGRP:           s += 'x'; break;
 683         case S_ISGID:           s += 'S'; break;
 684         case S_IXGRP | S_ISGID: s += 's'; break;
 685         default:                s += '-'; break;
 686         }
 687
 688         // Other permissions
 689         s += (mode & S_IROTH) ? 'r' : '-';
 690         s += (mode & S_IWOTH) ? 'w' : '-';
 691         switch (mode & (S_IXOTH | S_ISVTX)) {
 692         case S_IXOTH:           s += 'x'; break;
 693         case S_ISVTX:           s += 'T'; break;
 694         case S_IXOTH | S_ISVTX: s += 't'; break;
 695         default:                s += '-'; break;
 696         }
 697
 698         return s;
 699 }
 700
 701 int unistd_gzopen(char* pathname, int flags, mode_t mode)
 702 {
 703         char* gz_mode;
 704
 705         switch (flags & O_ACCMODE) {
 706         case O_WRONLY:
 707                 gz_mode = "w";
 708                 break;
 709
 710         case O_RDONLY:
 711                 gz_mode = "r";
 712                 break;
 713
 714         case O_RDWR:
 715         default:
 716                 errno = EINVAL;
 717                 return -1;
 718         }
 719
 720         int fd;
 721         gzFile gz_file;
 722
 723         if ((fd = open(pathname, flags, mode)) == -1)
 724                 return -1;
 725
 726         if ((flags & O_CREAT) && fchmod(fd, mode))
 727                 return -1;
 728
 729         if (!(gz_file = gzdopen(fd, gz_mode))) {
 730                 errno = ENOMEM;
 731                 return -1;
 732         }
 733
 734         return (int)gz_file;
 735 }
 736
 737 string trim_filename(const string& filename)
 738 {
 739         string search("//");
 740         string result = filename;
 741
 742         for (string::size_type pos = result.find(search); pos != string::npos; pos = result.find(search))
 743                 result.replace(pos, search.size(), "/");
 744
 745         return result;
 746 }
 747
 748 bool file_exists(const string& filename)
 749 {
 750         struct stat buf;
 751         return !lstat(filename.c_str(), &buf);
 752 }
 753
 754 bool file_empty(const string& filename)
 755 {
 756         struct stat buf;
 757
 758         if (lstat(filename.c_str(), &buf) == -1)
 759                 return false;
 760
 761         return (S_ISREG(buf.st_mode) && buf.st_size == 0);
 762 }
 763
 764 bool file_equal(const string& file1, const string& file2)
 765 {
 766         struct stat buf1, buf2;
 767
 768         if (lstat(file1.c_str(), &buf1) == -1)
 769                 return false;
 770
 771         if (lstat(file2.c_str(), &buf2) == -1)
 772                 return false;
 773
 774         // Regular files
 775         if (S_ISREG(buf1.st_mode) && S_ISREG(buf2.st_mode)) {
 776                 ifstream f1(file1.c_str());
 777                 ifstream f2(file2.c_str());
 778
 779                 if (!f1 || !f2)
 780                         return false;
 781
 782                 while (!f1.eof()) {
 783                         char buffer1[4096];
 784                         char buffer2[4096];
 785                         f1.read(buffer1, 4096);
 786                         f2.read(buffer2, 4096);
 787                         if (f1.gcount() != f2.gcount() ||
 788                             memcmp(buffer1, buffer2, f1.gcount()) ||
 789                             f1.eof() != f2.eof())
 790                                 return false;
 791                 }
 792
 793                 return true;
 794         }
 795         // Symlinks
 796         else if (S_ISLNK(buf1.st_mode) && S_ISLNK(buf2.st_mode)) {
 797                 char symlink1[MAXPATHLEN];
 798                 char symlink2[MAXPATHLEN];
 799
 800                 memset(symlink1, 0, MAXPATHLEN);
 801                 memset(symlink2, 0, MAXPATHLEN);
 802
 803                 if (readlink(file1.c_str(), symlink1, MAXPATHLEN - 1) == -1)
 804                         return false;
 805
 806                 if (readlink(file2.c_str(), symlink2, MAXPATHLEN - 1) == -1)
 807                         return false;
 808
 809                 return !strncmp(symlink1, symlink2, MAXPATHLEN);
 810         }
 811         // Character devices
 812         else if (S_ISCHR(buf1.st_mode) && S_ISCHR(buf2.st_mode)) {
 813                 return buf1.st_dev == buf2.st_dev;
 814         }
 815         // Block devices
 816         else if (S_ISBLK(buf1.st_mode) && S_ISBLK(buf2.st_mode)) {
 817                 return buf1.st_dev == buf2.st_dev;
 818         }
 819
 820         return false;
 821 }
 822
 823 bool permissions_equal(const string& file1, const string& file2)
 824 {
 825         struct stat buf1;
 826         struct stat buf2;
 827
 828         if (lstat(file1.c_str(), &buf1) == -1)
 829                 return false;
 830
 831         if (lstat(file2.c_str(), &buf2) == -1)
 832                 return false;
 833
 834         return(buf1.st_mode == buf2.st_mode) &&
 835                 (buf1.st_uid == buf2.st_uid) &&
 836                 (buf1.st_gid == buf2.st_gid);
 837 }
 838
 839 void file_remove(const string& basedir, const string& filename)
 840 {
 841         if (filename != basedir && !remove(filename.c_str())) {
 842                 char* path = strdup(filename.c_str());
 843                 file_remove(basedir, dirname(path));
 844                 free(path);
 845         }
 846 }