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 #include "exec_cmd.h"
  10 #include "strbuf.h"
  11 #include "quote.h"
  12
  13 #define MAXNAME (256)
  14
  15 typedef struct config_file {
  16         struct config_file *prev;
  17         FILE *f;
  18         const char *name;
  19         int linenr;
  20         int eof;
  21         struct strbuf value;
  22         char var[MAXNAME];
  23 } config_file;
  24
  25 static config_file *cf;
  26
  27 static int zlib_compression_seen;
  28
  29 const char *config_exclusive_filename = NULL;
  30
  31 static void lowercase(char *p)
  32 {
  33         for (; *p; p++)
  34                 *p = tolower(*p);
  35 }
  36
  37 void git_config_push_parameter(const char *text)
  38 {
  39         struct strbuf env = STRBUF_INIT;
  40         const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
  41         if (old) {
  42                 strbuf_addstr(&env, old);
  43                 strbuf_addch(&env, ' ');
  44         }
  45         sq_quote_buf(&env, text);
  46         setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
  47         strbuf_release(&env);
  48 }
  49
  50 int git_config_parse_parameter(const char *text,
  51                                config_fn_t fn, void *data)
  52 {
  53         struct strbuf **pair;
  54         pair = strbuf_split_str(text, '=', 2);
  55         if (!pair[0])
  56                 return error("bogus config parameter: %s", text);
  57         if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
  58                 strbuf_setlen(pair[0], pair[0]->len - 1);
  59         strbuf_trim(pair[0]);
  60         if (!pair[0]->len) {
  61                 strbuf_list_free(pair);
  62                 return error("bogus config parameter: %s", text);
  63         }
  64         lowercase(pair[0]->buf);
  65         if (fn(pair[0]->buf, pair[1] ? pair[1]->buf : NULL, data) < 0) {
  66                 strbuf_list_free(pair);
  67                 return -1;
  68         }
  69         strbuf_list_free(pair);
  70         return 0;
  71 }
  72
  73 int git_config_from_parameters(config_fn_t fn, void *data)
  74 {
  75         const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
  76         char *envw;
  77         const char **argv = NULL;
  78         int nr = 0, alloc = 0;
  79         int i;
  80
  81         if (!env)
  82                 return 0;
  83         /* sq_dequote will write over it */
  84         envw = xstrdup(env);
  85
  86         if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
  87                 free(envw);
  88                 return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
  89         }
  90
  91         for (i = 0; i < nr; i++) {
  92                 if (git_config_parse_parameter(argv[i], fn, data) < 0) {
  93                         free(argv);
  94                         free(envw);
  95                         return -1;
  96                 }
  97         }
  98
  99         free(argv);
 100         free(envw);
 101         return nr > 0;
 102 }
 103
 104 static int get_next_char(void)
 105 {
 106         int c;
 107         FILE *f;
 108
 109         c = '\n';
 110         if (cf && ((f = cf->f) != NULL)) {
 111                 c = fgetc(f);
 112                 if (c == '\r') {
 113                         /* DOS like systems */
 114                         c = fgetc(f);
 115                         if (c != '\n') {
 116                                 ungetc(c, f);
 117                                 c = '\r';
 118                         }
 119                 }
 120                 if (c == '\n')
 121                         cf->linenr++;
 122                 if (c == EOF) {
 123                         cf->eof = 1;
 124                         c = '\n';
 125                 }
 126         }
 127         return c;
 128 }
 129
 130 static char *parse_value(void)
 131 {
 132         int quote = 0, comment = 0, space = 0;
 133
 134         strbuf_reset(&cf->value);
 135         for (;;) {
 136                 int c = get_next_char();
 137                 if (c == '\n') {
 138                         if (quote)
 139                                 return NULL;
 140                         return cf->value.buf;
 141                 }
 142                 if (comment)
 143                         continue;
 144                 if (isspace(c) && !quote) {
 145                         if (cf->value.len)
 146                                 space++;
 147                         continue;
 148                 }
 149                 if (!quote) {
 150                         if (c == ';' || c == '#') {
 151                                 comment = 1;
 152                                 continue;
 153                         }
 154                 }
 155                 for (; space; space--)
 156                         strbuf_addch(&cf->value, ' ');
 157                 if (c == '\\') {
 158                         c = get_next_char();
 159                         switch (c) {
 160                         case '\n':
 161                                 continue;
 162                         case 't':
 163                                 c = '\t';
 164                                 break;
 165                         case 'b':
 166                                 c = '\b';
 167                                 break;
 168                         case 'n':
 169                                 c = '\n';
 170                                 break;
 171                         /* Some characters escape as themselves */
 172                         case '\\': case '"':
 173                                 break;
 174                         /* Reject unknown escape sequences */
 175                         default:
 176                                 return NULL;
 177                         }
 178                         strbuf_addch(&cf->value, c);
 179                         continue;
 180                 }
 181                 if (c == '"') {
 182                         quote = 1-quote;
 183                         continue;
 184                 }
 185                 strbuf_addch(&cf->value, c);
 186         }
 187 }
 188
 189 static inline int iskeychar(int c)
 190 {
 191         return isalnum(c) || c == '-';
 192 }
 193
 194 static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
 195 {
 196         int c;
 197         char *value;
 198
 199         /* Get the full name */
 200         for (;;) {
 201                 c = get_next_char();
 202                 if (cf->eof)
 203                         break;
 204                 if (!iskeychar(c))
 205                         break;
 206                 name[len++] = tolower(c);
 207                 if (len >= MAXNAME)
 208                         return -1;
 209         }
 210         name[len] = 0;
 211         while (c == ' ' || c == '\t')
 212                 c = get_next_char();
 213
 214         value = NULL;
 215         if (c != '\n') {
 216                 if (c != '=')
 217                         return -1;
 218                 value = parse_value();
 219                 if (!value)
 220                         return -1;
 221         }
 222         return fn(name, value, data);
 223 }
 224
 225 static int get_extended_base_var(char *name, int baselen, int c)
 226 {
 227         do {
 228                 if (c == '\n')
 229                         return -1;
 230                 c = get_next_char();
 231         } while (isspace(c));
 232
 233         /* We require the format to be '[base "extension"]' */
 234         if (c != '"')
 235                 return -1;
 236         name[baselen++] = '.';
 237
 238         for (;;) {
 239                 int c = get_next_char();
 240                 if (c == '\n')
 241                         return -1;
 242                 if (c == '"')
 243                         break;
 244                 if (c == '\\') {
 245                         c = get_next_char();
 246                         if (c == '\n')
 247                                 return -1;
 248                 }
 249                 name[baselen++] = c;
 250                 if (baselen > MAXNAME / 2)
 251                         return -1;
 252         }
 253
 254         /* Final ']' */
 255         if (get_next_char() != ']')
 256                 return -1;
 257         return baselen;
 258 }
 259
 260 static int get_base_var(char *name)
 261 {
 262         int baselen = 0;
 263
 264         for (;;) {
 265                 int c = get_next_char();
 266                 if (cf->eof)
 267                         return -1;
 268                 if (c == ']')
 269                         return baselen;
 270                 if (isspace(c))
 271                         return get_extended_base_var(name, baselen, c);
 272                 if (!iskeychar(c) && c != '.')
 273                         return -1;
 274                 if (baselen > MAXNAME / 2)
 275                         return -1;
 276                 name[baselen++] = tolower(c);
 277         }
 278 }
 279
 280 static int git_parse_file(config_fn_t fn, void *data)
 281 {
 282         int comment = 0;
 283         int baselen = 0;
 284         char *var = cf->var;
 285
 286         /* U+FEFF Byte Order Mark in UTF8 */
 287         static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 288         const unsigned char *bomptr = utf8_bom;
 289
 290         for (;;) {
 291                 int c = get_next_char();
 292                 if (bomptr && *bomptr) {
 293                         /* We are at the file beginning; skip UTF8-encoded BOM
 294                          * if present. Sane editors won't put this in on their
 295                          * own, but e.g. Windows Notepad will do it happily. */
 296                         if ((unsigned char) c == *bomptr) {
 297                                 bomptr++;
 298                                 continue;
 299                         } else {
 300                                 /* Do not tolerate partial BOM. */
 301                                 if (bomptr != utf8_bom)
 302                                         break;
 303                                 /* No BOM at file beginning. Cool. */
 304                                 bomptr = NULL;
 305                         }
 306                 }
 307                 if (c == '\n') {
 308                         if (cf->eof)
 309                                 return 0;
 310                         comment = 0;
 311                         continue;
 312                 }
 313                 if (comment || isspace(c))
 314                         continue;
 315                 if (c == '#' || c == ';') {
 316                         comment = 1;
 317                         continue;
 318                 }
 319                 if (c == '[') {
 320                         baselen = get_base_var(var);
 321                         if (baselen <= 0)
 322                                 break;
 323                         var[baselen++] = '.';
 324                         var[baselen] = 0;
 325                         continue;
 326                 }
 327                 if (!isalpha(c))
 328                         break;
 329                 var[baselen] = tolower(c);
 330                 if (get_value(fn, data, var, baselen+1) < 0)
 331                         break;
 332         }
 333         die("bad config file line %d in %s", cf->linenr, cf->name);
 334 }
 335
 336 static int parse_unit_factor(const char *end, uintmax_t *val)
 337 {
 338         if (!*end)
 339                 return 1;
 340         else if (!strcasecmp(end, "k")) {
 341                 *val *= 1024;
 342                 return 1;
 343         }
 344         else if (!strcasecmp(end, "m")) {
 345                 *val *= 1024 * 1024;
 346                 return 1;
 347         }
 348         else if (!strcasecmp(end, "g")) {
 349                 *val *= 1024 * 1024 * 1024;
 350                 return 1;
 351         }
 352         return 0;
 353 }
 354
 355 static int git_parse_long(const char *value, long *ret)
 356 {
 357         if (value && *value) {
 358                 char *end;
 359                 intmax_t val;
 360                 uintmax_t uval;
 361                 uintmax_t factor = 1;
 362
 363                 errno = 0;
 364                 val = strtoimax(value, &end, 0);
 365                 if (errno == ERANGE)
 366                         return 0;
 367                 if (!parse_unit_factor(end, &factor))
 368                         return 0;
 369                 uval = abs(val);
 370                 uval *= factor;
 371                 if ((uval > maximum_signed_value_of_type(long)) ||
 372                     (abs(val) > uval))
 373                         return 0;
 374                 val *= factor;
 375                 *ret = val;
 376                 return 1;
 377         }
 378         return 0;
 379 }
 380
 381 int git_parse_ulong(const char *value, unsigned long *ret)
 382 {
 383         if (value && *value) {
 384                 char *end;
 385                 uintmax_t val;
 386                 uintmax_t oldval;
 387
 388                 errno = 0;
 389                 val = strtoumax(value, &end, 0);
 390                 if (errno == ERANGE)
 391                         return 0;
 392                 oldval = val;
 393                 if (!parse_unit_factor(end, &val))
 394                         return 0;
 395                 if ((val > maximum_unsigned_value_of_type(long)) ||
 396                     (oldval > val))
 397                         return 0;
 398                 *ret = val;
 399                 return 1;
 400         }
 401         return 0;
 402 }
 403
 404 static void die_bad_config(const char *name)
 405 {
 406         if (cf && cf->name)
 407                 die("bad config value for '%s' in %s", name, cf->name);
 408         die("bad config value for '%s'", name);
 409 }
 410
 411 int git_config_int(const char *name, const char *value)
 412 {
 413         long ret = 0;
 414         if (!git_parse_long(value, &ret))
 415                 die_bad_config(name);
 416         return ret;
 417 }
 418
 419 unsigned long git_config_ulong(const char *name, const char *value)
 420 {
 421         unsigned long ret;
 422         if (!git_parse_ulong(value, &ret))
 423                 die_bad_config(name);
 424         return ret;
 425 }
 426
 427 static int git_config_maybe_bool_text(const char *name, const char *value)
 428 {
 429         if (!value)
 430                 return 1;
 431         if (!*value)
 432                 return 0;
 433         if (!strcasecmp(value, "true")
 434             || !strcasecmp(value, "yes")
 435             || !strcasecmp(value, "on"))
 436                 return 1;
 437         if (!strcasecmp(value, "false")
 438             || !strcasecmp(value, "no")
 439             || !strcasecmp(value, "off"))
 440                 return 0;
 441         return -1;
 442 }
 443
 444 int git_config_maybe_bool(const char *name, const char *value)
 445 {
 446         long v = git_config_maybe_bool_text(name, value);
 447         if (0 <= v)
 448                 return v;
 449         if (git_parse_long(value, &v))
 450                 return !!v;
 451         return -1;
 452 }
 453
 454 int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 455 {
 456         int v = git_config_maybe_bool_text(name, value);
 457         if (0 <= v) {
 458                 *is_bool = 1;
 459                 return v;
 460         }
 461         *is_bool = 0;
 462         return git_config_int(name, value);
 463 }
 464
 465 int git_config_bool(const char *name, const char *value)
 466 {
 467         int discard;
 468         return !!git_config_bool_or_int(name, value, &discard);
 469 }
 470
 471 int git_config_string(const char **dest, const char *var, const char *value)
 472 {
 473         if (!value)
 474                 return config_error_nonbool(var);
 475         *dest = xstrdup(value);
 476         return 0;
 477 }
 478
 479 int git_config_pathname(const char **dest, const char *var, const char *value)
 480 {
 481         if (!value)
 482                 return config_error_nonbool(var);
 483         *dest = expand_user_path(value);
 484         if (!*dest)
 485                 die("Failed to expand user dir in: '%s'", value);
 486         return 0;
 487 }
 488
 489 static int git_default_core_config(const char *var, const char *value)
 490 {
 491         /* This needs a better name */
 492         if (!strcmp(var, "core.filemode")) {
 493                 trust_executable_bit = git_config_bool(var, value);
 494                 return 0;
 495         }
 496         if (!strcmp(var, "core.trustctime")) {
 497                 trust_ctime = git_config_bool(var, value);
 498                 return 0;
 499         }
 500
 501         if (!strcmp(var, "core.quotepath")) {
 502                 quote_path_fully = git_config_bool(var, value);
 503                 return 0;
 504         }
 505
 506         if (!strcmp(var, "core.symlinks")) {
 507                 has_symlinks = git_config_bool(var, value);
 508                 return 0;
 509         }
 510
 511         if (!strcmp(var, "core.ignorecase")) {
 512                 ignore_case = git_config_bool(var, value);
 513                 return 0;
 514         }
 515
 516         if (!strcmp(var, "core.attributesfile"))
 517                 return git_config_pathname(&git_attributes_file, var, value);
 518
 519         if (!strcmp(var, "core.bare")) {
 520                 is_bare_repository_cfg = git_config_bool(var, value);
 521                 return 0;
 522         }
 523
 524         if (!strcmp(var, "core.ignorestat")) {
 525                 assume_unchanged = git_config_bool(var, value);
 526                 return 0;
 527         }
 528
 529         if (!strcmp(var, "core.prefersymlinkrefs")) {
 530                 prefer_symlink_refs = git_config_bool(var, value);
 531                 return 0;
 532         }
 533
 534         if (!strcmp(var, "core.logallrefupdates")) {
 535                 log_all_ref_updates = git_config_bool(var, value);
 536                 return 0;
 537         }
 538
 539         if (!strcmp(var, "core.warnambiguousrefs")) {
 540                 warn_ambiguous_refs = git_config_bool(var, value);
 541                 return 0;
 542         }
 543
 544         if (!strcmp(var, "core.abbrev")) {
 545                 int abbrev = git_config_int(var, value);
 546                 if (abbrev < minimum_abbrev || abbrev > 40)
 547                         return -1;
 548                 default_abbrev = abbrev;
 549                 return 0;
 550         }
 551
 552         if (!strcmp(var, "core.loosecompression")) {
 553                 int level = git_config_int(var, value);
 554                 if (level == -1)
 555                         level = Z_DEFAULT_COMPRESSION;
 556                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 557                         die("bad zlib compression level %d", level);
 558                 zlib_compression_level = level;
 559                 zlib_compression_seen = 1;
 560                 return 0;
 561         }
 562
 563         if (!strcmp(var, "core.compression")) {
 564                 int level = git_config_int(var, value);
 565                 if (level == -1)
 566                         level = Z_DEFAULT_COMPRESSION;
 567                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 568                         die("bad zlib compression level %d", level);
 569                 core_compression_level = level;
 570                 core_compression_seen = 1;
 571                 if (!zlib_compression_seen)
 572                         zlib_compression_level = level;
 573                 return 0;
 574         }
 575
 576         if (!strcmp(var, "core.packedgitwindowsize")) {
 577                 int pgsz_x2 = getpagesize() * 2;
 578                 packed_git_window_size = git_config_ulong(var, value);
 579
 580                 /* This value must be multiple of (pagesize * 2) */
 581                 packed_git_window_size /= pgsz_x2;
 582                 if (packed_git_window_size < 1)
 583                         packed_git_window_size = 1;
 584                 packed_git_window_size *= pgsz_x2;
 585                 return 0;
 586         }
 587
 588         if (!strcmp(var, "core.bigfilethreshold")) {
 589                 big_file_threshold = git_config_ulong(var, value);
 590                 return 0;
 591         }
 592
 593         if (!strcmp(var, "core.packedgitlimit")) {
 594                 packed_git_limit = git_config_ulong(var, value);
 595                 return 0;
 596         }
 597
 598         if (!strcmp(var, "core.deltabasecachelimit")) {
 599                 delta_base_cache_limit = git_config_ulong(var, value);
 600                 return 0;
 601         }
 602
 603         if (!strcmp(var, "core.logpackaccess"))
 604                 return git_config_string(&log_pack_access, var, value);
 605
 606         if (!strcmp(var, "core.autocrlf")) {
 607                 if (value && !strcasecmp(value, "input")) {
 608                         if (core_eol == EOL_CRLF)
 609                                 return error("core.autocrlf=input conflicts with core.eol=crlf");
 610                         auto_crlf = AUTO_CRLF_INPUT;
 611                         return 0;
 612                 }
 613                 auto_crlf = git_config_bool(var, value);
 614                 return 0;
 615         }
 616
 617         if (!strcmp(var, "core.safecrlf")) {
 618                 if (value && !strcasecmp(value, "warn")) {
 619                         safe_crlf = SAFE_CRLF_WARN;
 620                         return 0;
 621                 }
 622                 safe_crlf = git_config_bool(var, value);
 623                 return 0;
 624         }
 625
 626         if (!strcmp(var, "core.eol")) {
 627                 if (value && !strcasecmp(value, "lf"))
 628                         core_eol = EOL_LF;
 629                 else if (value && !strcasecmp(value, "crlf"))
 630                         core_eol = EOL_CRLF;
 631                 else if (value && !strcasecmp(value, "native"))
 632                         core_eol = EOL_NATIVE;
 633                 else
 634                         core_eol = EOL_UNSET;
 635                 if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 636                         return error("core.autocrlf=input conflicts with core.eol=crlf");
 637                 return 0;
 638         }
 639
 640         if (!strcmp(var, "core.notesref")) {
 641                 notes_ref_name = xstrdup(value);
 642                 return 0;
 643         }
 644
 645         if (!strcmp(var, "core.pager"))
 646                 return git_config_string(&pager_program, var, value);
 647
 648         if (!strcmp(var, "core.editor"))
 649                 return git_config_string(&editor_program, var, value);
 650
 651         if (!strcmp(var, "core.askpass"))
 652                 return git_config_string(&askpass_program, var, value);
 653
 654         if (!strcmp(var, "core.excludesfile"))
 655                 return git_config_pathname(&excludes_file, var, value);
 656
 657         if (!strcmp(var, "core.whitespace")) {
 658                 if (!value)
 659                         return config_error_nonbool(var);
 660                 whitespace_rule_cfg = parse_whitespace_rule(value);
 661                 return 0;
 662         }
 663
 664         if (!strcmp(var, "core.fsyncobjectfiles")) {
 665                 fsync_object_files = git_config_bool(var, value);
 666                 return 0;
 667         }
 668
 669         if (!strcmp(var, "core.preloadindex")) {
 670                 core_preload_index = git_config_bool(var, value);
 671                 return 0;
 672         }
 673
 674         if (!strcmp(var, "core.createobject")) {
 675                 if (!strcmp(value, "rename"))
 676                         object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 677                 else if (!strcmp(value, "link"))
 678                         object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 679                 else
 680                         die("Invalid mode for object creation: %s", value);
 681                 return 0;
 682         }
 683
 684         if (!strcmp(var, "core.sparsecheckout")) {
 685                 core_apply_sparse_checkout = git_config_bool(var, value);
 686                 return 0;
 687         }
 688
 689         /* Add other config variables here and to Documentation/config.txt. */
 690         return 0;
 691 }
 692
 693 static int git_default_user_config(const char *var, const char *value)
 694 {
 695         if (!strcmp(var, "user.name")) {
 696                 if (!value)
 697                         return config_error_nonbool(var);
 698                 strlcpy(git_default_name, value, sizeof(git_default_name));
 699                 user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 700                 return 0;
 701         }
 702
 703         if (!strcmp(var, "user.email")) {
 704                 if (!value)
 705                         return config_error_nonbool(var);
 706                 strlcpy(git_default_email, value, sizeof(git_default_email));
 707                 user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 708                 return 0;
 709         }
 710
 711         /* Add other config variables here and to Documentation/config.txt. */
 712         return 0;
 713 }
 714
 715 static int git_default_i18n_config(const char *var, const char *value)
 716 {
 717         if (!strcmp(var, "i18n.commitencoding"))
 718                 return git_config_string(&git_commit_encoding, var, value);
 719
 720         if (!strcmp(var, "i18n.logoutputencoding"))
 721                 return git_config_string(&git_log_output_encoding, var, value);
 722
 723         /* Add other config variables here and to Documentation/config.txt. */
 724         return 0;
 725 }
 726
 727 static int git_default_branch_config(const char *var, const char *value)
 728 {
 729         if (!strcmp(var, "branch.autosetupmerge")) {
 730                 if (value && !strcasecmp(value, "always")) {
 731                         git_branch_track = BRANCH_TRACK_ALWAYS;
 732                         return 0;
 733                 }
 734                 git_branch_track = git_config_bool(var, value);
 735                 return 0;
 736         }
 737         if (!strcmp(var, "branch.autosetuprebase")) {
 738                 if (!value)
 739                         return config_error_nonbool(var);
 740                 else if (!strcmp(value, "never"))
 741                         autorebase = AUTOREBASE_NEVER;
 742                 else if (!strcmp(value, "local"))
 743                         autorebase = AUTOREBASE_LOCAL;
 744                 else if (!strcmp(value, "remote"))
 745                         autorebase = AUTOREBASE_REMOTE;
 746                 else if (!strcmp(value, "always"))
 747                         autorebase = AUTOREBASE_ALWAYS;
 748                 else
 749                         return error("Malformed value for %s", var);
 750                 return 0;
 751         }
 752
 753         /* Add other config variables here and to Documentation/config.txt. */
 754         return 0;
 755 }
 756
 757 static int git_default_push_config(const char *var, const char *value)
 758 {
 759         if (!strcmp(var, "push.default")) {
 760                 if (!value)
 761                         return config_error_nonbool(var);
 762                 else if (!strcmp(value, "nothing"))
 763                         push_default = PUSH_DEFAULT_NOTHING;
 764                 else if (!strcmp(value, "matching"))
 765                         push_default = PUSH_DEFAULT_MATCHING;
 766                 else if (!strcmp(value, "upstream"))
 767                         push_default = PUSH_DEFAULT_UPSTREAM;
 768                 else if (!strcmp(value, "tracking")) /* deprecated */
 769                         push_default = PUSH_DEFAULT_UPSTREAM;
 770                 else if (!strcmp(value, "current"))
 771                         push_default = PUSH_DEFAULT_CURRENT;
 772                 else {
 773                         error("Malformed value for %s: %s", var, value);
 774                         return error("Must be one of nothing, matching, "
 775                                      "tracking or current.");
 776                 }
 777                 return 0;
 778         }
 779
 780         /* Add other config variables here and to Documentation/config.txt. */
 781         return 0;
 782 }
 783
 784 static int git_default_mailmap_config(const char *var, const char *value)
 785 {
 786         if (!strcmp(var, "mailmap.file"))
 787                 return git_config_string(&git_mailmap_file, var, value);
 788
 789         /* Add other config variables here and to Documentation/config.txt. */
 790         return 0;
 791 }
 792
 793 int git_default_config(const char *var, const char *value, void *dummy)
 794 {
 795         if (!prefixcmp(var, "core."))
 796                 return git_default_core_config(var, value);
 797
 798         if (!prefixcmp(var, "user."))
 799                 return git_default_user_config(var, value);
 800
 801         if (!prefixcmp(var, "i18n."))
 802                 return git_default_i18n_config(var, value);
 803
 804         if (!prefixcmp(var, "branch."))
 805                 return git_default_branch_config(var, value);
 806
 807         if (!prefixcmp(var, "push."))
 808                 return git_default_push_config(var, value);
 809
 810         if (!prefixcmp(var, "mailmap."))
 811                 return git_default_mailmap_config(var, value);
 812
 813         if (!prefixcmp(var, "advice."))
 814                 return git_default_advice_config(var, value);
 815
 816         if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 817                 pager_use_color = git_config_bool(var,value);
 818                 return 0;
 819         }
 820
 821         /* Add other config variables here and to Documentation/config.txt. */
 822         return 0;
 823 }
 824
 825 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 826 {
 827         int ret;
 828         FILE *f = fopen(filename, "r");
 829
 830         ret = -1;
 831         if (f) {
 832                 config_file top;
 833
 834                 /* push config-file parsing state stack */
 835                 top.prev = cf;
 836                 top.f = f;
 837                 top.name = filename;
 838                 top.linenr = 1;
 839                 top.eof = 0;
 840                 strbuf_init(&top.value, 1024);
 841                 cf = &top;
 842
 843                 ret = git_parse_file(fn, data);
 844
 845                 /* pop config-file parsing state stack */
 846                 strbuf_release(&top.value);
 847                 cf = top.prev;
 848
 849                 fclose(f);
 850         }
 851         return ret;
 852 }
 853
 854 const char *git_etc_gitconfig(void)
 855 {
 856         static const char *system_wide;
 857         if (!system_wide)
 858                 system_wide = system_path(ETC_GITCONFIG);
 859         return system_wide;
 860 }
 861
 862 int git_env_bool(const char *k, int def)
 863 {
 864         const char *v = getenv(k);
 865         return v ? git_config_bool(k, v) : def;
 866 }
 867
 868 int git_config_system(void)
 869 {
 870         return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 871 }
 872
 873 int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 874 {
 875         int ret = 0, found = 0;
 876         const char *home = NULL;
 877
 878         /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
 879         if (config_exclusive_filename)
 880                 return git_config_from_file(fn, config_exclusive_filename, data);
 881         if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 882                 ret += git_config_from_file(fn, git_etc_gitconfig(),
 883                                             data);
 884                 found += 1;
 885         }
 886
 887         home = getenv("HOME");
 888         if (home) {
 889                 char buf[PATH_MAX];
 890                 char *user_config = mksnpath(buf, sizeof(buf), "%s/.gitconfig", home);
 891                 if (!access(user_config, R_OK)) {
 892                         ret += git_config_from_file(fn, user_config, data);
 893                         found += 1;
 894                 }
 895         }
 896
 897         if (repo_config && !access(repo_config, R_OK)) {
 898                 ret += git_config_from_file(fn, repo_config, data);
 899                 found += 1;
 900         }
 901
 902         switch (git_config_from_parameters(fn, data)) {
 903         case -1: /* error */
 904                 die("unable to parse command-line config");
 905                 break;
 906         case 0: /* found nothing */
 907                 break;
 908         default: /* found at least one item */
 909                 found++;
 910                 break;
 911         }
 912
 913         return ret == 0 ? found : ret;
 914 }
 915
 916 int git_config(config_fn_t fn, void *data)
 917 {
 918         char *repo_config = NULL;
 919         int ret;
 920
 921         repo_config = git_pathdup("config");
 922         ret = git_config_early(fn, data, repo_config);
 923         if (repo_config)
 924                 free(repo_config);
 925         return ret;
 926 }
 927
 928 /*
 929  * Find all the stuff for git_config_set() below.
 930  */
 931
 932 #define MAX_MATCHES 512
 933
 934 static struct {
 935         int baselen;
 936         char *key;
 937         int do_not_match;
 938         regex_t *value_regex;
 939         int multi_replace;
 940         size_t offset[MAX_MATCHES];
 941         enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 942         int seen;
 943 } store;
 944
 945 static int matches(const char *key, const char *value)
 946 {
 947         return !strcmp(key, store.key) &&
 948                 (store.value_regex == NULL ||
 949                  (store.do_not_match ^
 950                   !regexec(store.value_regex, value, 0, NULL, 0)));
 951 }
 952
 953 static int store_aux(const char *key, const char *value, void *cb)
 954 {
 955         const char *ep;
 956         size_t section_len;
 957         FILE *f = cf->f;
 958
 959         switch (store.state) {
 960         case KEY_SEEN:
 961                 if (matches(key, value)) {
 962                         if (store.seen == 1 && store.multi_replace == 0) {
 963                                 warning("%s has multiple values", key);
 964                         } else if (store.seen >= MAX_MATCHES) {
 965                                 error("too many matches for %s", key);
 966                                 return 1;
 967                         }
 968
 969                         store.offset[store.seen] = ftell(f);
 970                         store.seen++;
 971                 }
 972                 break;
 973         case SECTION_SEEN:
 974                 /*
 975                  * What we are looking for is in store.key (both
 976                  * section and var), and its section part is baselen
 977                  * long.  We found key (again, both section and var).
 978                  * We would want to know if this key is in the same
 979                  * section as what we are looking for.  We already
 980                  * know we are in the same section as what should
 981                  * hold store.key.
 982                  */
 983                 ep = strrchr(key, '.');
 984                 section_len = ep - key;
 985
 986                 if ((section_len != store.baselen) ||
 987                     memcmp(key, store.key, section_len+1)) {
 988                         store.state = SECTION_END_SEEN;
 989                         break;
 990                 }
 991
 992                 /*
 993                  * Do not increment matches: this is no match, but we
 994                  * just made sure we are in the desired section.
 995                  */
 996                 store.offset[store.seen] = ftell(f);
 997                 /* fallthru */
 998         case SECTION_END_SEEN:
 999         case START:
1000                 if (matches(key, value)) {
1001                         store.offset[store.seen] = ftell(f);
1002                         store.state = KEY_SEEN;
1003                         store.seen++;
1004                 } else {
1005                         if (strrchr(key, '.') - key == store.baselen &&
1006                               !strncmp(key, store.key, store.baselen)) {
1007                                         store.state = SECTION_SEEN;
1008                                         store.offset[store.seen] = ftell(f);
1009                         }
1010                 }
1011         }
1012         return 0;
1013 }
1014
1015 static int write_error(const char *filename)
1016 {
1017         error("failed to write new configuration file %s", filename);
1018
1019         /* Same error code as "failed to rename". */
1020         return 4;
1021 }
1022
1023 static int store_write_section(int fd, const char *key)
1024 {
1025         const char *dot;
1026         int i, success;
1027         struct strbuf sb = STRBUF_INIT;
1028
1029         dot = memchr(key, '.', store.baselen);
1030         if (dot) {
1031                 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1032                 for (i = dot - key + 1; i < store.baselen; i++) {
1033                         if (key[i] == '"' || key[i] == '\\')
1034                                 strbuf_addch(&sb, '\\');
1035                         strbuf_addch(&sb, key[i]);
1036                 }
1037                 strbuf_addstr(&sb, "\"]\n");
1038         } else {
1039                 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1040         }
1041
1042         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1043         strbuf_release(&sb);
1044
1045         return success;
1046 }
1047
1048 static int store_write_pair(int fd, const char *key, const char *value)
1049 {
1050         int i, success;
1051         int length = strlen(key + store.baselen + 1);
1052         const char *quote = "";
1053         struct strbuf sb = STRBUF_INIT;
1054
1055         /*
1056          * Check to see if the value needs to be surrounded with a dq pair.
1057          * Note that problematic characters are always backslash-quoted; this
1058          * check is about not losing leading or trailing SP and strings that
1059          * follow beginning-of-comment characters (i.e. ';' and '#') by the
1060          * configuration parser.
1061          */
1062         if (value[0] == ' ')
1063                 quote = "\"";
1064         for (i = 0; value[i]; i++)
1065                 if (value[i] == ';' || value[i] == '#')
1066                         quote = "\"";
1067         if (i && value[i - 1] == ' ')
1068                 quote = "\"";
1069
1070         strbuf_addf(&sb, "\t%.*s = %s",
1071                     length, key + store.baselen + 1, quote);
1072
1073         for (i = 0; value[i]; i++)
1074                 switch (value[i]) {
1075                 case '\n':
1076                         strbuf_addstr(&sb, "\\n");
1077                         break;
1078                 case '\t':
1079                         strbuf_addstr(&sb, "\\t");
1080                         break;
1081                 case '"':
1082                 case '\\':
1083                         strbuf_addch(&sb, '\\');
1084                 default:
1085                         strbuf_addch(&sb, value[i]);
1086                         break;
1087                 }
1088         strbuf_addf(&sb, "%s\n", quote);
1089
1090         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1091         strbuf_release(&sb);
1092
1093         return success;
1094 }
1095
1096 static ssize_t find_beginning_of_line(const char *contents, size_t size,
1097         size_t offset_, int *found_bracket)
1098 {
1099         size_t equal_offset = size, bracket_offset = size;
1100         ssize_t offset;
1101
1102 contline:
1103         for (offset = offset_-2; offset > 0
1104                         && contents[offset] != '\n'; offset--)
1105                 switch (contents[offset]) {
1106                         case '=': equal_offset = offset; break;
1107                         case ']': bracket_offset = offset; break;
1108                 }
1109         if (offset > 0 && contents[offset-1] == '\\') {
1110                 offset_ = offset;
1111                 goto contline;
1112         }
1113         if (bracket_offset < equal_offset) {
1114                 *found_bracket = 1;
1115                 offset = bracket_offset+1;
1116         } else
1117                 offset++;
1118
1119         return offset;
1120 }
1121
1122 int git_config_set_in_file(const char *config_filename,
1123                         const char *key, const char *value)
1124 {
1125         return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1126 }
1127
1128 int git_config_set(const char *key, const char *value)
1129 {
1130         return git_config_set_multivar(key, value, NULL, 0);
1131 }
1132
1133 /*
1134  * Auxiliary function to sanity-check and split the key into the section
1135  * identifier and variable name.
1136  *
1137  * Returns 0 on success, -1 when there is an invalid character in the key and
1138  * -2 if there is no section name in the key.
1139  *
1140  * store_key - pointer to char* which will hold a copy of the key with
1141  *             lowercase section and variable name
1142  * baselen - pointer to int which will hold the length of the
1143  *           section + subsection part, can be NULL
1144  */
1145 int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1146 {
1147         int i, dot, baselen;
1148         const char *last_dot = strrchr(key, '.');
1149
1150         /*
1151          * Since "key" actually contains the section name and the real
1152          * key name separated by a dot, we have to know where the dot is.
1153          */
1154
1155         if (last_dot == NULL || last_dot == key) {
1156                 error("key does not contain a section: %s", key);
1157                 return -CONFIG_NO_SECTION_OR_NAME;
1158         }
1159
1160         if (!last_dot[1]) {
1161                 error("key does not contain variable name: %s", key);
1162                 return -CONFIG_NO_SECTION_OR_NAME;
1163         }
1164
1165         baselen = last_dot - key;
1166         if (baselen_)
1167                 *baselen_ = baselen;
1168
1169         /*
1170          * Validate the key and while at it, lower case it for matching.
1171          */
1172         *store_key = xmalloc(strlen(key) + 1);
1173
1174         dot = 0;
1175         for (i = 0; key[i]; i++) {
1176                 unsigned char c = key[i];
1177                 if (c == '.')
1178                         dot = 1;
1179                 /* Leave the extended basename untouched.. */
1180                 if (!dot || i > baselen) {
1181                         if (!iskeychar(c) ||
1182                             (i == baselen + 1 && !isalpha(c))) {
1183                                 error("invalid key: %s", key);
1184                                 goto out_free_ret_1;
1185                         }
1186                         c = tolower(c);
1187                 } else if (c == '\n') {
1188                         error("invalid key (newline): %s", key);
1189                         goto out_free_ret_1;
1190                 }
1191                 (*store_key)[i] = c;
1192         }
1193         (*store_key)[i] = 0;
1194
1195         return 0;
1196
1197 out_free_ret_1:
1198         free(*store_key);
1199         return -CONFIG_INVALID_KEY;
1200 }
1201
1202 /*
1203  * If value==NULL, unset in (remove from) config,
1204  * if value_regex!=NULL, disregard key/value pairs where value does not match.
1205  * if multi_replace==0, nothing, or only one matching key/value is replaced,
1206  *     else all matching key/values (regardless how many) are removed,
1207  *     before the new pair is written.
1208  *
1209  * Returns 0 on success.
1210  *
1211  * This function does this:
1212  *
1213  * - it locks the config file by creating ".git/config.lock"
1214  *
1215  * - it then parses the config using store_aux() as validator to find
1216  *   the position on the key/value pair to replace. If it is to be unset,
1217  *   it must be found exactly once.
1218  *
1219  * - the config file is mmap()ed and the part before the match (if any) is
1220  *   written to the lock file, then the changed part and the rest.
1221  *
1222  * - the config file is removed and the lock file rename()d to it.
1223  *
1224  */
1225 int git_config_set_multivar_in_file(const char *config_filename,
1226                                 const char *key, const char *value,
1227                                 const char *value_regex, int multi_replace)
1228 {
1229         int fd = -1, in_fd;
1230         int ret;
1231         struct lock_file *lock = NULL;
1232
1233         /* parse-key returns negative; flip the sign to feed exit(3) */
1234         ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1235         if (ret)
1236                 goto out_free;
1237
1238         store.multi_replace = multi_replace;
1239
1240
1241         /*
1242          * The lock serves a purpose in addition to locking: the new
1243          * contents of .git/config will be written into it.
1244          */
1245         lock = xcalloc(sizeof(struct lock_file), 1);
1246         fd = hold_lock_file_for_update(lock, config_filename, 0);
1247         if (fd < 0) {
1248                 error("could not lock config file %s: %s", config_filename, strerror(errno));
1249                 free(store.key);
1250                 ret = CONFIG_NO_LOCK;
1251                 goto out_free;
1252         }
1253
1254         /*
1255          * If .git/config does not exist yet, write a minimal version.
1256          */
1257         in_fd = open(config_filename, O_RDONLY);
1258         if ( in_fd < 0 ) {
1259                 free(store.key);
1260
1261                 if ( ENOENT != errno ) {
1262                         error("opening %s: %s", config_filename,
1263                               strerror(errno));
1264                         ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1265                         goto out_free;
1266                 }
1267                 /* if nothing to unset, error out */
1268                 if (value == NULL) {
1269                         ret = CONFIG_NOTHING_SET;
1270                         goto out_free;
1271                 }
1272
1273                 store.key = (char *)key;
1274                 if (!store_write_section(fd, key) ||
1275                     !store_write_pair(fd, key, value))
1276                         goto write_err_out;
1277         } else {
1278                 struct stat st;
1279                 char *contents;
1280                 size_t contents_sz, copy_begin, copy_end;
1281                 int i, new_line = 0;
1282
1283                 if (value_regex == NULL)
1284                         store.value_regex = NULL;
1285                 else {
1286                         if (value_regex[0] == '!') {
1287                                 store.do_not_match = 1;
1288                                 value_regex++;
1289                         } else
1290                                 store.do_not_match = 0;
1291
1292                         store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1293                         if (regcomp(store.value_regex, value_regex,
1294                                         REG_EXTENDED)) {
1295                                 error("invalid pattern: %s", value_regex);
1296                                 free(store.value_regex);
1297                                 ret = CONFIG_INVALID_PATTERN;
1298                                 goto out_free;
1299                         }
1300                 }
1301
1302                 store.offset[0] = 0;
1303                 store.state = START;
1304                 store.seen = 0;
1305
1306                 /*
1307                  * After this, store.offset will contain the *end* offset
1308                  * of the last match, or remain at 0 if no match was found.
1309                  * As a side effect, we make sure to transform only a valid
1310                  * existing config file.
1311                  */
1312                 if (git_config_from_file(store_aux, config_filename, NULL)) {
1313                         error("invalid config file %s", config_filename);
1314                         free(store.key);
1315                         if (store.value_regex != NULL) {
1316                                 regfree(store.value_regex);
1317                                 free(store.value_regex);
1318                         }
1319                         ret = CONFIG_INVALID_FILE;
1320                         goto out_free;
1321                 }
1322
1323                 free(store.key);
1324                 if (store.value_regex != NULL) {
1325                         regfree(store.value_regex);
1326                         free(store.value_regex);
1327                 }
1328
1329                 /* if nothing to unset, or too many matches, error out */
1330                 if ((store.seen == 0 && value == NULL) ||
1331                                 (store.seen > 1 && multi_replace == 0)) {
1332                         ret = CONFIG_NOTHING_SET;
1333                         goto out_free;
1334                 }
1335
1336                 fstat(in_fd, &st);
1337                 contents_sz = xsize_t(st.st_size);
1338                 contents = xmmap(NULL, contents_sz, PROT_READ,
1339                         MAP_PRIVATE, in_fd, 0);
1340                 close(in_fd);
1341
1342                 if (store.seen == 0)
1343                         store.seen = 1;
1344
1345                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1346                         if (store.offset[i] == 0) {
1347                                 store.offset[i] = copy_end = contents_sz;
1348                         } else if (store.state != KEY_SEEN) {
1349                                 copy_end = store.offset[i];
1350                         } else
1351                                 copy_end = find_beginning_of_line(
1352                                         contents, contents_sz,
1353                                         store.offset[i]-2, &new_line);
1354
1355                         if (copy_end > 0 && contents[copy_end-1] != '\n')
1356                                 new_line = 1;
1357
1358                         /* write the first part of the config */
1359                         if (copy_end > copy_begin) {
1360                                 if (write_in_full(fd, contents + copy_begin,
1361                                                   copy_end - copy_begin) <
1362                                     copy_end - copy_begin)
1363                                         goto write_err_out;
1364                                 if (new_line &&
1365                                     write_str_in_full(fd, "\n") != 1)
1366                                         goto write_err_out;
1367                         }
1368                         copy_begin = store.offset[i];
1369                 }
1370
1371                 /* write the pair (value == NULL means unset) */
1372                 if (value != NULL) {
1373                         if (store.state == START) {
1374                                 if (!store_write_section(fd, key))
1375                                         goto write_err_out;
1376                         }
1377                         if (!store_write_pair(fd, key, value))
1378                                 goto write_err_out;
1379                 }
1380
1381                 /* write the rest of the config */
1382                 if (copy_begin < contents_sz)
1383                         if (write_in_full(fd, contents + copy_begin,
1384                                           contents_sz - copy_begin) <
1385                             contents_sz - copy_begin)
1386                                 goto write_err_out;
1387
1388                 munmap(contents, contents_sz);
1389         }
1390
1391         if (commit_lock_file(lock) < 0) {
1392                 error("could not commit config file %s", config_filename);
1393                 ret = CONFIG_NO_WRITE;
1394                 goto out_free;
1395         }
1396
1397         /*
1398          * lock is committed, so don't try to roll it back below.
1399          * NOTE: Since lockfile.c keeps a linked list of all created
1400          * lock_file structures, it isn't safe to free(lock).  It's
1401          * better to just leave it hanging around.
1402          */
1403         lock = NULL;
1404         ret = 0;
1405
1406 out_free:
1407         if (lock)
1408                 rollback_lock_file(lock);
1409         return ret;
1410
1411 write_err_out:
1412         ret = write_error(lock->filename);
1413         goto out_free;
1414
1415 }
1416
1417 int git_config_set_multivar(const char *key, const char *value,
1418                         const char *value_regex, int multi_replace)
1419 {
1420         const char *config_filename;
1421         char *buf = NULL;
1422         int ret;
1423
1424         if (config_exclusive_filename)
1425                 config_filename = config_exclusive_filename;
1426         else
1427                 config_filename = buf = git_pathdup("config");
1428
1429         ret = git_config_set_multivar_in_file(config_filename, key, value,
1430                                         value_regex, multi_replace);
1431         free(buf);
1432         return ret;
1433 }
1434
1435 static int section_name_match (const char *buf, const char *name)
1436 {
1437         int i = 0, j = 0, dot = 0;
1438         if (buf[i] != '[')
1439                 return 0;
1440         for (i = 1; buf[i] && buf[i] != ']'; i++) {
1441                 if (!dot && isspace(buf[i])) {
1442                         dot = 1;
1443                         if (name[j++] != '.')
1444                                 break;
1445                         for (i++; isspace(buf[i]); i++)
1446                                 ; /* do nothing */
1447                         if (buf[i] != '"')
1448                                 break;
1449                         continue;
1450                 }
1451                 if (buf[i] == '\\' && dot)
1452                         i++;
1453                 else if (buf[i] == '"' && dot) {
1454                         for (i++; isspace(buf[i]); i++)
1455                                 ; /* do_nothing */
1456                         break;
1457                 }
1458                 if (buf[i] != name[j++])
1459                         break;
1460         }
1461         if (buf[i] == ']' && name[j] == 0) {
1462                 /*
1463                  * We match, now just find the right length offset by
1464                  * gobbling up any whitespace after it, as well
1465                  */
1466                 i++;
1467                 for (; buf[i] && isspace(buf[i]); i++)
1468                         ; /* do nothing */
1469                 return i;
1470         }
1471         return 0;
1472 }
1473
1474 /* if new_name == NULL, the section is removed instead */
1475 int git_config_rename_section(const char *old_name, const char *new_name)
1476 {
1477         int ret = 0, remove = 0;
1478         char *config_filename;
1479         struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1480         int out_fd;
1481         char buf[1024];
1482         FILE *config_file;
1483
1484         if (config_exclusive_filename)
1485                 config_filename = xstrdup(config_exclusive_filename);
1486         else
1487                 config_filename = git_pathdup("config");
1488         out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1489         if (out_fd < 0) {
1490                 ret = error("could not lock config file %s", config_filename);
1491                 goto out;
1492         }
1493
1494         if (!(config_file = fopen(config_filename, "rb"))) {
1495                 /* no config file means nothing to rename, no error */
1496                 goto unlock_and_out;
1497         }
1498
1499         while (fgets(buf, sizeof(buf), config_file)) {
1500                 int i;
1501                 int length;
1502                 char *output = buf;
1503                 for (i = 0; buf[i] && isspace(buf[i]); i++)
1504                         ; /* do nothing */
1505                 if (buf[i] == '[') {
1506                         /* it's a section */
1507                         int offset = section_name_match(&buf[i], old_name);
1508                         if (offset > 0) {
1509                                 ret++;
1510                                 if (new_name == NULL) {
1511                                         remove = 1;
1512                                         continue;
1513                                 }
1514                                 store.baselen = strlen(new_name);
1515                                 if (!store_write_section(out_fd, new_name)) {
1516                                         ret = write_error(lock->filename);
1517                                         goto out;
1518                                 }
1519                                 /*
1520                                  * We wrote out the new section, with
1521                                  * a newline, now skip the old
1522                                  * section's length
1523                                  */
1524                                 output += offset + i;
1525                                 if (strlen(output) > 0) {
1526                                         /*
1527                                          * More content means there's
1528                                          * a declaration to put on the
1529                                          * next line; indent with a
1530                                          * tab
1531                                          */
1532                                         output -= 1;
1533                                         output[0] = '\t';
1534                                 }
1535                         }
1536                         remove = 0;
1537                 }
1538                 if (remove)
1539                         continue;
1540                 length = strlen(output);
1541                 if (write_in_full(out_fd, output, length) != length) {
1542                         ret = write_error(lock->filename);
1543                         goto out;
1544                 }
1545         }
1546         fclose(config_file);
1547 unlock_and_out:
1548         if (commit_lock_file(lock) < 0)
1549                 ret = error("could not commit config file %s", config_filename);
1550 out:
1551         free(config_filename);
1552         return ret;
1553 }
1554
1555 /*
1556  * Call this to report error for your variable that should not
1557  * get a boolean value (i.e. "[my] var" means "true").
1558  */
1559 int config_error_nonbool(const char *var)
1560 {
1561         return error("Missing value for '%s'", var);
1562 }