config.c

   1 /*
   2  * GIT - The information manager from hell
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  * Copyright (C) Johannes Schindelin, 2005
   6  *
   7  */
   8 #include "cache.h"
   9
  10 #define MAXNAME (256)
  11
  12 static FILE *config_file;
  13 static const char *config_file_name;
  14 static int config_linenr;
  15 static int get_next_char(void)
  16 {
  17         int c;
  18         FILE *f;
  19
  20         c = '\n';
  21         if ((f = config_file) != NULL) {
  22                 c = fgetc(f);
  23                 if (c == '\r') {
  24                         /* DOS like systems */
  25                         c = fgetc(f);
  26                         if (c != '\n') {
  27                                 ungetc(c, f);
  28                                 c = '\r';
  29                         }
  30                 }
  31                 if (c == '\n')
  32                         config_linenr++;
  33                 if (c == EOF) {
  34                         config_file = NULL;
  35                         c = '\n';
  36                 }
  37         }
  38         return c;
  39 }
  40
  41 static char *parse_value(void)
  42 {
  43         static char value[1024];
  44         int quote = 0, comment = 0, len = 0, space = 0;
  45
  46         for (;;) {
  47                 int c = get_next_char();
  48                 if (len >= sizeof(value))
  49                         return NULL;
  50                 if (c == '\n') {
  51                         if (quote)
  52                                 return NULL;
  53                         value[len] = 0;
  54                         return value;
  55                 }
  56                 if (comment)
  57                         continue;
  58                 if (isspace(c) && !quote) {
  59                         space = 1;
  60                         continue;
  61                 }
  62                 if (!quote) {
  63                         if (c == ';' || c == '#') {
  64                                 comment = 1;
  65                                 continue;
  66                         }
  67                 }
  68                 if (space) {
  69                         if (len)
  70                                 value[len++] = ' ';
  71                         space = 0;
  72                 }
  73                 if (c == '\\') {
  74                         c = get_next_char();
  75                         switch (c) {
  76                         case '\n':
  77                                 continue;
  78                         case 't':
  79                                 c = '\t';
  80                                 break;
  81                         case 'b':
  82                                 c = '\b';
  83                                 break;
  84                         case 'n':
  85                                 c = '\n';
  86                                 break;
  87                         /* Some characters escape as themselves */
  88                         case '\\': case '"':
  89                                 break;
  90                         /* Reject unknown escape sequences */
  91                         default:
  92                                 return NULL;
  93                         }
  94                         value[len++] = c;
  95                         continue;
  96                 }
  97                 if (c == '"') {
  98                         quote = 1-quote;
  99                         continue;
 100                 }
 101                 value[len++] = c;
 102         }
 103 }
 104
 105 static inline int iskeychar(int c)
 106 {
 107         return isalnum(c) || c == '-';
 108 }
 109
 110 static int get_value(config_fn_t fn, char *name, unsigned int len)
 111 {
 112         int c;
 113         char *value;
 114
 115         /* Get the full name */
 116         for (;;) {
 117                 c = get_next_char();
 118                 if (c == EOF)
 119                         break;
 120                 if (!iskeychar(c))
 121                         break;
 122                 name[len++] = tolower(c);
 123                 if (len >= MAXNAME)
 124                         return -1;
 125         }
 126         name[len] = 0;
 127         while (c == ' ' || c == '\t')
 128                 c = get_next_char();
 129
 130         value = NULL;
 131         if (c != '\n') {
 132                 if (c != '=')
 133                         return -1;
 134                 value = parse_value();
 135                 if (!value)
 136                         return -1;
 137         }
 138         return fn(name, value);
 139 }
 140
 141 static int get_extended_base_var(char *name, int baselen, int c)
 142 {
 143         do {
 144                 if (c == '\n')
 145                         return -1;
 146                 c = get_next_char();
 147         } while (isspace(c));
 148
 149         /* We require the format to be '[base "extension"]' */
 150         if (c != '"')
 151                 return -1;
 152         name[baselen++] = '.';
 153
 154         for (;;) {
 155                 int c = get_next_char();
 156                 if (c == '\n')
 157                         return -1;
 158                 if (c == '"')
 159                         break;
 160                 if (c == '\\') {
 161                         c = get_next_char();
 162                         if (c == '\n')
 163                                 return -1;
 164                 }
 165                 name[baselen++] = c;
 166                 if (baselen > MAXNAME / 2)
 167                         return -1;
 168         }
 169
 170         /* Final ']' */
 171         if (get_next_char() != ']')
 172                 return -1;
 173         return baselen;
 174 }
 175
 176 static int get_base_var(char *name)
 177 {
 178         int baselen = 0;
 179
 180         for (;;) {
 181                 int c = get_next_char();
 182                 if (c == EOF)
 183                         return -1;
 184                 if (c == ']')
 185                         return baselen;
 186                 if (isspace(c))
 187                         return get_extended_base_var(name, baselen, c);
 188                 if (!iskeychar(c) && c != '.')
 189                         return -1;
 190                 if (baselen > MAXNAME / 2)
 191                         return -1;
 192                 name[baselen++] = tolower(c);
 193         }
 194 }
 195
 196 static int git_parse_file(config_fn_t fn)
 197 {
 198         int comment = 0;
 199         int baselen = 0;
 200         static char var[MAXNAME];
 201
 202         for (;;) {
 203                 int c = get_next_char();
 204                 if (c == '\n') {
 205                         /* EOF? */
 206                         if (!config_file)
 207                                 return 0;
 208                         comment = 0;
 209                         continue;
 210                 }
 211                 if (comment || isspace(c))
 212                         continue;
 213                 if (c == '#' || c == ';') {
 214                         comment = 1;
 215                         continue;
 216                 }
 217                 if (c == '[') {
 218                         baselen = get_base_var(var);
 219                         if (baselen <= 0)
 220                                 break;
 221                         var[baselen++] = '.';
 222                         var[baselen] = 0;
 223                         continue;
 224                 }
 225                 if (!isalpha(c))
 226                         break;
 227                 var[baselen] = tolower(c);
 228                 if (get_value(fn, var, baselen+1) < 0)
 229                         break;
 230         }
 231         die("bad config file line %d in %s", config_linenr, config_file_name);
 232 }
 233
 234 int git_config_int(const char *name, const char *value)
 235 {
 236         if (value && *value) {
 237                 char *end;
 238                 int val = strtol(value, &end, 0);
 239                 if (!*end)
 240                         return val;
 241         }
 242         die("bad config value for '%s' in %s", name, config_file_name);
 243 }
 244
 245 int git_config_bool(const char *name, const char *value)
 246 {
 247         if (!value)
 248                 return 1;
 249         if (!*value)
 250                 return 0;
 251         if (!strcasecmp(value, "true") || !strcasecmp(value, "yes"))
 252                 return 1;
 253         if (!strcasecmp(value, "false") || !strcasecmp(value, "no"))
 254                 return 0;
 255         return git_config_int(name, value) != 0;
 256 }
 257
 258 int git_default_config(const char *var, const char *value)
 259 {
 260         /* This needs a better name */
 261         if (!strcmp(var, "core.filemode")) {
 262                 trust_executable_bit = git_config_bool(var, value);
 263                 return 0;
 264         }
 265
 266         if (!strcmp(var, "core.ignorestat")) {
 267                 assume_unchanged = git_config_bool(var, value);
 268                 return 0;
 269         }
 270
 271         if (!strcmp(var, "core.prefersymlinkrefs")) {
 272                 prefer_symlink_refs = git_config_bool(var, value);
 273                 return 0;
 274         }
 275
 276         if (!strcmp(var, "core.logallrefupdates")) {
 277                 log_all_ref_updates = git_config_bool(var, value);
 278                 return 0;
 279         }
 280
 281         if (!strcmp(var, "core.warnambiguousrefs")) {
 282                 warn_ambiguous_refs = git_config_bool(var, value);
 283                 return 0;
 284         }
 285
 286         if (!strcmp(var, "core.legacyheaders")) {
 287                 use_legacy_headers = git_config_bool(var, value);
 288                 return 0;
 289         }
 290
 291         if (!strcmp(var, "core.compression")) {
 292                 int level = git_config_int(var, value);
 293                 if (level == -1)
 294                         level = Z_DEFAULT_COMPRESSION;
 295                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 296                         die("bad zlib compression level %d", level);
 297                 zlib_compression_level = level;
 298                 return 0;
 299         }
 300
 301         if (!strcmp(var, "core.packedgitwindowsize")) {
 302                 int pgsz = getpagesize();
 303                 packed_git_window_size = git_config_int(var, value);
 304                 packed_git_window_size /= pgsz;
 305                 if (packed_git_window_size < 2)
 306                         packed_git_window_size = 2;
 307                 packed_git_window_size *= pgsz;
 308                 return 0;
 309         }
 310
 311         if (!strcmp(var, "core.packedgitlimit")) {
 312                 packed_git_limit = git_config_int(var, value);
 313                 return 0;
 314         }
 315
 316         if (!strcmp(var, "user.name")) {
 317                 strlcpy(git_default_name, value, sizeof(git_default_name));
 318                 return 0;
 319         }
 320
 321         if (!strcmp(var, "user.email")) {
 322                 strlcpy(git_default_email, value, sizeof(git_default_email));
 323                 return 0;
 324         }
 325
 326         if (!strcmp(var, "i18n.commitencoding")) {
 327                 git_commit_encoding = strdup(value);
 328                 return 0;
 329         }
 330
 331         if (!strcmp(var, "i18n.logoutputencoding")) {
 332                 git_log_output_encoding = strdup(value);
 333                 return 0;
 334         }
 335
 336
 337         if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 338                 pager_use_color = git_config_bool(var,value);
 339                 return 0;
 340         }
 341
 342         /* Add other config variables here and to Documentation/config.txt. */
 343         return 0;
 344 }
 345
 346 int git_config_from_file(config_fn_t fn, const char *filename)
 347 {
 348         int ret;
 349         FILE *f = fopen(filename, "r");
 350
 351         ret = -1;
 352         if (f) {
 353                 config_file = f;
 354                 config_file_name = filename;
 355                 config_linenr = 1;
 356                 ret = git_parse_file(fn);
 357                 fclose(f);
 358                 config_file_name = NULL;
 359         }
 360         return ret;
 361 }
 362
 363 int git_config(config_fn_t fn)
 364 {
 365         int ret = 0;
 366         char *repo_config = NULL;
 367         const char *home = NULL, *filename;
 368
 369         /* $GIT_CONFIG makes git read _only_ the given config file,
 370          * $GIT_CONFIG_LOCAL will make it process it in addition to the
 371          * global config file, the same way it would the per-repository
 372          * config file otherwise. */
 373         filename = getenv(CONFIG_ENVIRONMENT);
 374         if (!filename) {
 375                 home = getenv("HOME");
 376                 filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
 377                 if (!filename)
 378                         filename = repo_config = xstrdup(git_path("config"));
 379         }
 380
 381         if (home) {
 382                 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
 383                 if (!access(user_config, R_OK))
 384                         ret = git_config_from_file(fn, user_config);
 385                 free(user_config);
 386         }
 387
 388         ret += git_config_from_file(fn, filename);
 389         free(repo_config);
 390         return ret;
 391 }
 392
 393 /*
 394  * Find all the stuff for git_config_set() below.
 395  */
 396
 397 #define MAX_MATCHES 512
 398
 399 static struct {
 400         int baselen;
 401         char* key;
 402         int do_not_match;
 403         regex_t* value_regex;
 404         int multi_replace;
 405         off_t offset[MAX_MATCHES];
 406         enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 407         int seen;
 408 } store;
 409
 410 static int matches(const char* key, const char* value)
 411 {
 412         return !strcmp(key, store.key) &&
 413                 (store.value_regex == NULL ||
 414                  (store.do_not_match ^
 415                   !regexec(store.value_regex, value, 0, NULL, 0)));
 416 }
 417
 418 static int store_aux(const char* key, const char* value)
 419 {
 420         switch (store.state) {
 421         case KEY_SEEN:
 422                 if (matches(key, value)) {
 423                         if (store.seen == 1 && store.multi_replace == 0) {
 424                                 fprintf(stderr,
 425                                         "Warning: %s has multiple values\n",
 426                                         key);
 427                         } else if (store.seen >= MAX_MATCHES) {
 428                                 fprintf(stderr, "Too many matches\n");
 429                                 return 1;
 430                         }
 431
 432                         store.offset[store.seen] = ftell(config_file);
 433                         store.seen++;
 434                 }
 435                 break;
 436         case SECTION_SEEN:
 437                 if (strncmp(key, store.key, store.baselen+1)) {
 438                         store.state = SECTION_END_SEEN;
 439                         break;
 440                 } else
 441                         /* do not increment matches: this is no match */
 442                         store.offset[store.seen] = ftell(config_file);
 443                 /* fallthru */
 444         case SECTION_END_SEEN:
 445         case START:
 446                 if (matches(key, value)) {
 447                         store.offset[store.seen] = ftell(config_file);
 448                         store.state = KEY_SEEN;
 449                         store.seen++;
 450                 } else {
 451                         if (strrchr(key, '.') - key == store.baselen &&
 452                               !strncmp(key, store.key, store.baselen)) {
 453                                         store.state = SECTION_SEEN;
 454                                         store.offset[store.seen] = ftell(config_file);
 455                         }
 456                 }
 457         }
 458         return 0;
 459 }
 460
 461 static void store_write_section(int fd, const char* key)
 462 {
 463         const char *dot = strchr(key, '.');
 464         int len1 = store.baselen, len2 = -1;
 465
 466         dot = strchr(key, '.');
 467         if (dot) {
 468                 int dotlen = dot - key;
 469                 if (dotlen < len1) {
 470                         len2 = len1 - dotlen - 1;
 471                         len1 = dotlen;
 472                 }
 473         }
 474
 475         write(fd, "[", 1);
 476         write(fd, key, len1);
 477         if (len2 >= 0) {
 478                 write(fd, " \"", 2);
 479                 while (--len2 >= 0) {
 480                         unsigned char c = *++dot;
 481                         if (c == '"')
 482                                 write(fd, "\\", 1);
 483                         write(fd, &c, 1);
 484                 }
 485                 write(fd, "\"", 1);
 486         }
 487         write(fd, "]\n", 2);
 488 }
 489
 490 static void store_write_pair(int fd, const char* key, const char* value)
 491 {
 492         int i;
 493
 494         write(fd, "\t", 1);
 495         write(fd, key+store.baselen+1,
 496                 strlen(key+store.baselen+1));
 497         write(fd, " = ", 3);
 498         for (i = 0; value[i]; i++)
 499                 switch (value[i]) {
 500                 case '\n': write(fd, "\\n", 2); break;
 501                 case '\t': write(fd, "\\t", 2); break;
 502                 case '"': case '\\': write(fd, "\\", 1);
 503                 default: write(fd, value+i, 1);
 504         }
 505         write(fd, "\n", 1);
 506 }
 507
 508 static int find_beginning_of_line(const char* contents, int size,
 509         int offset_, int* found_bracket)
 510 {
 511         int equal_offset = size, bracket_offset = size;
 512         int offset;
 513
 514         for (offset = offset_-2; offset > 0
 515                         && contents[offset] != '\n'; offset--)
 516                 switch (contents[offset]) {
 517                         case '=': equal_offset = offset; break;
 518                         case ']': bracket_offset = offset; break;
 519                 }
 520         if (bracket_offset < equal_offset) {
 521                 *found_bracket = 1;
 522                 offset = bracket_offset+1;
 523         } else
 524                 offset++;
 525
 526         return offset;
 527 }
 528
 529 int git_config_set(const char* key, const char* value)
 530 {
 531         return git_config_set_multivar(key, value, NULL, 0);
 532 }
 533
 534 /*
 535  * If value==NULL, unset in (remove from) config,
 536  * if value_regex!=NULL, disregard key/value pairs where value does not match.
 537  * if multi_replace==0, nothing, or only one matching key/value is replaced,
 538  *     else all matching key/values (regardless how many) are removed,
 539  *     before the new pair is written.
 540  *
 541  * Returns 0 on success.
 542  *
 543  * This function does this:
 544  *
 545  * - it locks the config file by creating ".git/config.lock"
 546  *
 547  * - it then parses the config using store_aux() as validator to find
 548  *   the position on the key/value pair to replace. If it is to be unset,
 549  *   it must be found exactly once.
 550  *
 551  * - the config file is mmap()ed and the part before the match (if any) is
 552  *   written to the lock file, then the changed part and the rest.
 553  *
 554  * - the config file is removed and the lock file rename()d to it.
 555  *
 556  */
 557 int git_config_set_multivar(const char* key, const char* value,
 558         const char* value_regex, int multi_replace)
 559 {
 560         int i, dot;
 561         int fd = -1, in_fd;
 562         int ret;
 563         char* config_filename;
 564         char* lock_file;
 565         const char* last_dot = strrchr(key, '.');
 566
 567         config_filename = getenv(CONFIG_ENVIRONMENT);
 568         if (!config_filename) {
 569                 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
 570                 if (!config_filename)
 571                         config_filename  = git_path("config");
 572         }
 573         config_filename = xstrdup(config_filename);
 574         lock_file = xstrdup(mkpath("%s.lock", config_filename));
 575
 576         /*
 577          * Since "key" actually contains the section name and the real
 578          * key name separated by a dot, we have to know where the dot is.
 579          */
 580
 581         if (last_dot == NULL) {
 582                 fprintf(stderr, "key does not contain a section: %s\n", key);
 583                 ret = 2;
 584                 goto out_free;
 585         }
 586         store.baselen = last_dot - key;
 587
 588         store.multi_replace = multi_replace;
 589
 590         /*
 591          * Validate the key and while at it, lower case it for matching.
 592          */
 593         store.key = xmalloc(strlen(key) + 1);
 594         dot = 0;
 595         for (i = 0; key[i]; i++) {
 596                 unsigned char c = key[i];
 597                 if (c == '.')
 598                         dot = 1;
 599                 /* Leave the extended basename untouched.. */
 600                 if (!dot || i > store.baselen) {
 601                         if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
 602                                 fprintf(stderr, "invalid key: %s\n", key);
 603                                 free(store.key);
 604                                 ret = 1;
 605                                 goto out_free;
 606                         }
 607                         c = tolower(c);
 608                 }
 609                 store.key[i] = c;
 610         }
 611         store.key[i] = 0;
 612
 613         /*
 614          * The lock_file serves a purpose in addition to locking: the new
 615          * contents of .git/config will be written into it.
 616          */
 617         fd = open(lock_file, O_WRONLY | O_CREAT | O_EXCL, 0666);
 618         if (fd < 0 || adjust_shared_perm(lock_file)) {
 619                 fprintf(stderr, "could not lock config file\n");
 620                 free(store.key);
 621                 ret = -1;
 622                 goto out_free;
 623         }
 624
 625         /*
 626          * If .git/config does not exist yet, write a minimal version.
 627          */
 628         in_fd = open(config_filename, O_RDONLY);
 629         if ( in_fd < 0 ) {
 630                 free(store.key);
 631
 632                 if ( ENOENT != errno ) {
 633                         error("opening %s: %s", config_filename,
 634                               strerror(errno));
 635                         ret = 3; /* same as "invalid config file" */
 636                         goto out_free;
 637                 }
 638                 /* if nothing to unset, error out */
 639                 if (value == NULL) {
 640                         ret = 5;
 641                         goto out_free;
 642                 }
 643
 644                 store.key = (char*)key;
 645                 store_write_section(fd, key);
 646                 store_write_pair(fd, key, value);
 647         } else{
 648                 struct stat st;
 649                 char* contents;
 650                 int i, copy_begin, copy_end, new_line = 0;
 651
 652                 if (value_regex == NULL)
 653                         store.value_regex = NULL;
 654                 else {
 655                         if (value_regex[0] == '!') {
 656                                 store.do_not_match = 1;
 657                                 value_regex++;
 658                         } else
 659                                 store.do_not_match = 0;
 660
 661                         store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
 662                         if (regcomp(store.value_regex, value_regex,
 663                                         REG_EXTENDED)) {
 664                                 fprintf(stderr, "Invalid pattern: %s\n",
 665                                         value_regex);
 666                                 free(store.value_regex);
 667                                 ret = 6;
 668                                 goto out_free;
 669                         }
 670                 }
 671
 672                 store.offset[0] = 0;
 673                 store.state = START;
 674                 store.seen = 0;
 675
 676                 /*
 677                  * After this, store.offset will contain the *end* offset
 678                  * of the last match, or remain at 0 if no match was found.
 679                  * As a side effect, we make sure to transform only a valid
 680                  * existing config file.
 681                  */
 682                 if (git_config_from_file(store_aux, config_filename)) {
 683                         fprintf(stderr, "invalid config file\n");
 684                         free(store.key);
 685                         if (store.value_regex != NULL) {
 686                                 regfree(store.value_regex);
 687                                 free(store.value_regex);
 688                         }
 689                         ret = 3;
 690                         goto out_free;
 691                 }
 692
 693                 free(store.key);
 694                 if (store.value_regex != NULL) {
 695                         regfree(store.value_regex);
 696                         free(store.value_regex);
 697                 }
 698
 699                 /* if nothing to unset, or too many matches, error out */
 700                 if ((store.seen == 0 && value == NULL) ||
 701                                 (store.seen > 1 && multi_replace == 0)) {
 702                         ret = 5;
 703                         goto out_free;
 704                 }
 705
 706                 fstat(in_fd, &st);
 707                 contents = mmap(NULL, st.st_size, PROT_READ,
 708                         MAP_PRIVATE, in_fd, 0);
 709                 close(in_fd);
 710
 711                 if (store.seen == 0)
 712                         store.seen = 1;
 713
 714                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
 715                         if (store.offset[i] == 0) {
 716                                 store.offset[i] = copy_end = st.st_size;
 717                         } else if (store.state != KEY_SEEN) {
 718                                 copy_end = store.offset[i];
 719                         } else
 720                                 copy_end = find_beginning_of_line(
 721                                         contents, st.st_size,
 722                                         store.offset[i]-2, &new_line);
 723
 724                         /* write the first part of the config */
 725                         if (copy_end > copy_begin) {
 726                                 write(fd, contents + copy_begin,
 727                                 copy_end - copy_begin);
 728                                 if (new_line)
 729                                         write(fd, "\n", 1);
 730                         }
 731                         copy_begin = store.offset[i];
 732                 }
 733
 734                 /* write the pair (value == NULL means unset) */
 735                 if (value != NULL) {
 736                         if (store.state == START)
 737                                 store_write_section(fd, key);
 738                         store_write_pair(fd, key, value);
 739                 }
 740
 741                 /* write the rest of the config */
 742                 if (copy_begin < st.st_size)
 743                         write(fd, contents + copy_begin,
 744                                 st.st_size - copy_begin);
 745
 746                 munmap(contents, st.st_size);
 747                 unlink(config_filename);
 748         }
 749
 750         if (rename(lock_file, config_filename) < 0) {
 751                 fprintf(stderr, "Could not rename the lock file?\n");
 752                 ret = 4;
 753                 goto out_free;
 754         }
 755
 756         ret = 0;
 757
 758 out_free:
 759         if (0 <= fd)
 760                 close(fd);
 761         free(config_filename);
 762         if (lock_file) {
 763                 unlink(lock_file);
 764                 free(lock_file);
 765         }
 766         return ret;
 767 }
 768
 769 int git_config_rename_section(const char *old_name, const char *new_name)
 770 {
 771         int ret = 0;
 772         char *config_filename;
 773         struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
 774         int out_fd;
 775         char buf[1024];
 776
 777         config_filename = getenv(CONFIG_ENVIRONMENT);
 778         if (!config_filename) {
 779                 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
 780                 if (!config_filename)
 781                         config_filename  = git_path("config");
 782         }
 783         config_filename = xstrdup(config_filename);
 784         out_fd = hold_lock_file_for_update(lock, config_filename, 0);
 785         if (out_fd < 0) {
 786                 ret = error("Could not lock config file!");
 787                 goto out;
 788         }
 789
 790         if (!(config_file = fopen(config_filename, "rb"))) {
 791                 ret = error("Could not open config file!");
 792                 goto out;
 793         }
 794
 795         while (fgets(buf, sizeof(buf), config_file)) {
 796                 int i;
 797                 for (i = 0; buf[i] && isspace(buf[i]); i++)
 798                         ; /* do nothing */
 799                 if (buf[i] == '[') {
 800                         /* it's a section */
 801                         int j = 0, dot = 0;
 802                         for (i++; buf[i] && buf[i] != ']'; i++) {
 803                                 if (!dot && isspace(buf[i])) {
 804                                         dot = 1;
 805                                         if (old_name[j++] != '.')
 806                                                 break;
 807                                         for (i++; isspace(buf[i]); i++)
 808                                                 ; /* do nothing */
 809                                         if (buf[i] != '"')
 810                                                 break;
 811                                         continue;
 812                                 }
 813                                 if (buf[i] == '\\' && dot)
 814                                         i++;
 815                                 else if (buf[i] == '"' && dot) {
 816                                         for (i++; isspace(buf[i]); i++)
 817                                                 ; /* do_nothing */
 818                                         break;
 819                                 }
 820                                 if (buf[i] != old_name[j++])
 821                                         break;
 822                         }
 823                         if (buf[i] == ']') {
 824                                 /* old_name matches */
 825                                 ret++;
 826                                 store.baselen = strlen(new_name);
 827                                 store_write_section(out_fd, new_name);
 828                                 continue;
 829                         }
 830                 }
 831                 write(out_fd, buf, strlen(buf));
 832         }
 833         fclose(config_file);
 834         if (close(out_fd) || commit_lock_file(lock) < 0)
 835                 ret = error("Cannot commit config file!");
 836  out:
 837         free(config_filename);
 838         return ret;
 839 }
 840