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 static void lowercase(char *p)
  30 {
  31         for (; *p; p++)
  32                 *p = tolower(*p);
  33 }
  34
  35 void git_config_push_parameter(const char *text)
  36 {
  37         struct strbuf env = STRBUF_INIT;
  38         const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
  39         if (old) {
  40                 strbuf_addstr(&env, old);
  41                 strbuf_addch(&env, ' ');
  42         }
  43         sq_quote_buf(&env, text);
  44         setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
  45         strbuf_release(&env);
  46 }
  47
  48 int git_config_parse_parameter(const char *text,
  49                                config_fn_t fn, void *data)
  50 {
  51         struct strbuf **pair;
  52         pair = strbuf_split_str(text, '=', 2);
  53         if (!pair[0])
  54                 return error("bogus config parameter: %s", text);
  55         if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
  56                 strbuf_setlen(pair[0], pair[0]->len - 1);
  57         strbuf_trim(pair[0]);
  58         if (!pair[0]->len) {
  59                 strbuf_list_free(pair);
  60                 return error("bogus config parameter: %s", text);
  61         }
  62         lowercase(pair[0]->buf);
  63         if (fn(pair[0]->buf, pair[1] ? pair[1]->buf : NULL, data) < 0) {
  64                 strbuf_list_free(pair);
  65                 return -1;
  66         }
  67         strbuf_list_free(pair);
  68         return 0;
  69 }
  70
  71 int git_config_from_parameters(config_fn_t fn, void *data)
  72 {
  73         const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
  74         char *envw;
  75         const char **argv = NULL;
  76         int nr = 0, alloc = 0;
  77         int i;
  78
  79         if (!env)
  80                 return 0;
  81         /* sq_dequote will write over it */
  82         envw = xstrdup(env);
  83
  84         if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
  85                 free(envw);
  86                 return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
  87         }
  88
  89         for (i = 0; i < nr; i++) {
  90                 if (git_config_parse_parameter(argv[i], fn, data) < 0) {
  91                         free(argv);
  92                         free(envw);
  93                         return -1;
  94                 }
  95         }
  96
  97         free(argv);
  98         free(envw);
  99         return nr > 0;
 100 }
 101
 102 static int get_next_char(void)
 103 {
 104         int c;
 105         FILE *f;
 106
 107         c = '\n';
 108         if (cf && ((f = cf->f) != NULL)) {
 109                 c = fgetc(f);
 110                 if (c == '\r') {
 111                         /* DOS like systems */
 112                         c = fgetc(f);
 113                         if (c != '\n') {
 114                                 ungetc(c, f);
 115                                 c = '\r';
 116                         }
 117                 }
 118                 if (c == '\n')
 119                         cf->linenr++;
 120                 if (c == EOF) {
 121                         cf->eof = 1;
 122                         c = '\n';
 123                 }
 124         }
 125         return c;
 126 }
 127
 128 static char *parse_value(void)
 129 {
 130         int quote = 0, comment = 0, space = 0;
 131
 132         strbuf_reset(&cf->value);
 133         for (;;) {
 134                 int c = get_next_char();
 135                 if (c == '\n') {
 136                         if (quote)
 137                                 return NULL;
 138                         return cf->value.buf;
 139                 }
 140                 if (comment)
 141                         continue;
 142                 if (isspace(c) && !quote) {
 143                         if (cf->value.len)
 144                                 space++;
 145                         continue;
 146                 }
 147                 if (!quote) {
 148                         if (c == ';' || c == '#') {
 149                                 comment = 1;
 150                                 continue;
 151                         }
 152                 }
 153                 for (; space; space--)
 154                         strbuf_addch(&cf->value, ' ');
 155                 if (c == '\\') {
 156                         c = get_next_char();
 157                         switch (c) {
 158                         case '\n':
 159                                 continue;
 160                         case 't':
 161                                 c = '\t';
 162                                 break;
 163                         case 'b':
 164                                 c = '\b';
 165                                 break;
 166                         case 'n':
 167                                 c = '\n';
 168                                 break;
 169                         /* Some characters escape as themselves */
 170                         case '\\': case '"':
 171                                 break;
 172                         /* Reject unknown escape sequences */
 173                         default:
 174                                 return NULL;
 175                         }
 176                         strbuf_addch(&cf->value, c);
 177                         continue;
 178                 }
 179                 if (c == '"') {
 180                         quote = 1-quote;
 181                         continue;
 182                 }
 183                 strbuf_addch(&cf->value, c);
 184         }
 185 }
 186
 187 static inline int iskeychar(int c)
 188 {
 189         return isalnum(c) || c == '-';
 190 }
 191
 192 static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
 193 {
 194         int c;
 195         char *value;
 196
 197         /* Get the full name */
 198         for (;;) {
 199                 c = get_next_char();
 200                 if (cf->eof)
 201                         break;
 202                 if (!iskeychar(c))
 203                         break;
 204                 name[len++] = tolower(c);
 205                 if (len >= MAXNAME)
 206                         return -1;
 207         }
 208         name[len] = 0;
 209         while (c == ' ' || c == '\t')
 210                 c = get_next_char();
 211
 212         value = NULL;
 213         if (c != '\n') {
 214                 if (c != '=')
 215                         return -1;
 216                 value = parse_value();
 217                 if (!value)
 218                         return -1;
 219         }
 220         return fn(name, value, data);
 221 }
 222
 223 static int get_extended_base_var(char *name, int baselen, int c)
 224 {
 225         do {
 226                 if (c == '\n')
 227                         return -1;
 228                 c = get_next_char();
 229         } while (isspace(c));
 230
 231         /* We require the format to be '[base "extension"]' */
 232         if (c != '"')
 233                 return -1;
 234         name[baselen++] = '.';
 235
 236         for (;;) {
 237                 int c = get_next_char();
 238                 if (c == '\n')
 239                         return -1;
 240                 if (c == '"')
 241                         break;
 242                 if (c == '\\') {
 243                         c = get_next_char();
 244                         if (c == '\n')
 245                                 return -1;
 246                 }
 247                 name[baselen++] = c;
 248                 if (baselen > MAXNAME / 2)
 249                         return -1;
 250         }
 251
 252         /* Final ']' */
 253         if (get_next_char() != ']')
 254                 return -1;
 255         return baselen;
 256 }
 257
 258 static int get_base_var(char *name)
 259 {
 260         int baselen = 0;
 261
 262         for (;;) {
 263                 int c = get_next_char();
 264                 if (cf->eof)
 265                         return -1;
 266                 if (c == ']')
 267                         return baselen;
 268                 if (isspace(c))
 269                         return get_extended_base_var(name, baselen, c);
 270                 if (!iskeychar(c) && c != '.')
 271                         return -1;
 272                 if (baselen > MAXNAME / 2)
 273                         return -1;
 274                 name[baselen++] = tolower(c);
 275         }
 276 }
 277
 278 static int git_parse_file(config_fn_t fn, void *data)
 279 {
 280         int comment = 0;
 281         int baselen = 0;
 282         char *var = cf->var;
 283
 284         /* U+FEFF Byte Order Mark in UTF8 */
 285         static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 286         const unsigned char *bomptr = utf8_bom;
 287
 288         for (;;) {
 289                 int c = get_next_char();
 290                 if (bomptr && *bomptr) {
 291                         /* We are at the file beginning; skip UTF8-encoded BOM
 292                          * if present. Sane editors won't put this in on their
 293                          * own, but e.g. Windows Notepad will do it happily. */
 294                         if ((unsigned char) c == *bomptr) {
 295                                 bomptr++;
 296                                 continue;
 297                         } else {
 298                                 /* Do not tolerate partial BOM. */
 299                                 if (bomptr != utf8_bom)
 300                                         break;
 301                                 /* No BOM at file beginning. Cool. */
 302                                 bomptr = NULL;
 303                         }
 304                 }
 305                 if (c == '\n') {
 306                         if (cf->eof)
 307                                 return 0;
 308                         comment = 0;
 309                         continue;
 310                 }
 311                 if (comment || isspace(c))
 312                         continue;
 313                 if (c == '#' || c == ';') {
 314                         comment = 1;
 315                         continue;
 316                 }
 317                 if (c == '[') {
 318                         baselen = get_base_var(var);
 319                         if (baselen <= 0)
 320                                 break;
 321                         var[baselen++] = '.';
 322                         var[baselen] = 0;
 323                         continue;
 324                 }
 325                 if (!isalpha(c))
 326                         break;
 327                 var[baselen] = tolower(c);
 328                 if (get_value(fn, data, var, baselen+1) < 0)
 329                         break;
 330         }
 331         die("bad config file line %d in %s", cf->linenr, cf->name);
 332 }
 333
 334 static int parse_unit_factor(const char *end, uintmax_t *val)
 335 {
 336         if (!*end)
 337                 return 1;
 338         else if (!strcasecmp(end, "k")) {
 339                 *val *= 1024;
 340                 return 1;
 341         }
 342         else if (!strcasecmp(end, "m")) {
 343                 *val *= 1024 * 1024;
 344                 return 1;
 345         }
 346         else if (!strcasecmp(end, "g")) {
 347                 *val *= 1024 * 1024 * 1024;
 348                 return 1;
 349         }
 350         return 0;
 351 }
 352
 353 static int git_parse_long(const char *value, long *ret)
 354 {
 355         if (value && *value) {
 356                 char *end;
 357                 intmax_t val;
 358                 uintmax_t uval;
 359                 uintmax_t factor = 1;
 360
 361                 errno = 0;
 362                 val = strtoimax(value, &end, 0);
 363                 if (errno == ERANGE)
 364                         return 0;
 365                 if (!parse_unit_factor(end, &factor))
 366                         return 0;
 367                 uval = abs(val);
 368                 uval *= factor;
 369                 if ((uval > maximum_signed_value_of_type(long)) ||
 370                     (abs(val) > uval))
 371                         return 0;
 372                 val *= factor;
 373                 *ret = val;
 374                 return 1;
 375         }
 376         return 0;
 377 }
 378
 379 int git_parse_ulong(const char *value, unsigned long *ret)
 380 {
 381         if (value && *value) {
 382                 char *end;
 383                 uintmax_t val;
 384                 uintmax_t oldval;
 385
 386                 errno = 0;
 387                 val = strtoumax(value, &end, 0);
 388                 if (errno == ERANGE)
 389                         return 0;
 390                 oldval = val;
 391                 if (!parse_unit_factor(end, &val))
 392                         return 0;
 393                 if ((val > maximum_unsigned_value_of_type(long)) ||
 394                     (oldval > val))
 395                         return 0;
 396                 *ret = val;
 397                 return 1;
 398         }
 399         return 0;
 400 }
 401
 402 static void die_bad_config(const char *name)
 403 {
 404         if (cf && cf->name)
 405                 die("bad config value for '%s' in %s", name, cf->name);
 406         die("bad config value for '%s'", name);
 407 }
 408
 409 int git_config_int(const char *name, const char *value)
 410 {
 411         long ret = 0;
 412         if (!git_parse_long(value, &ret))
 413                 die_bad_config(name);
 414         return ret;
 415 }
 416
 417 unsigned long git_config_ulong(const char *name, const char *value)
 418 {
 419         unsigned long ret;
 420         if (!git_parse_ulong(value, &ret))
 421                 die_bad_config(name);
 422         return ret;
 423 }
 424
 425 static int git_config_maybe_bool_text(const char *name, const char *value)
 426 {
 427         if (!value)
 428                 return 1;
 429         if (!*value)
 430                 return 0;
 431         if (!strcasecmp(value, "true")
 432             || !strcasecmp(value, "yes")
 433             || !strcasecmp(value, "on"))
 434                 return 1;
 435         if (!strcasecmp(value, "false")
 436             || !strcasecmp(value, "no")
 437             || !strcasecmp(value, "off"))
 438                 return 0;
 439         return -1;
 440 }
 441
 442 int git_config_maybe_bool(const char *name, const char *value)
 443 {
 444         long v = git_config_maybe_bool_text(name, value);
 445         if (0 <= v)
 446                 return v;
 447         if (git_parse_long(value, &v))
 448                 return !!v;
 449         return -1;
 450 }
 451
 452 int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 453 {
 454         int v = git_config_maybe_bool_text(name, value);
 455         if (0 <= v) {
 456                 *is_bool = 1;
 457                 return v;
 458         }
 459         *is_bool = 0;
 460         return git_config_int(name, value);
 461 }
 462
 463 int git_config_bool(const char *name, const char *value)
 464 {
 465         int discard;
 466         return !!git_config_bool_or_int(name, value, &discard);
 467 }
 468
 469 int git_config_string(const char **dest, const char *var, const char *value)
 470 {
 471         if (!value)
 472                 return config_error_nonbool(var);
 473         *dest = xstrdup(value);
 474         return 0;
 475 }
 476
 477 int git_config_pathname(const char **dest, const char *var, const char *value)
 478 {
 479         if (!value)
 480                 return config_error_nonbool(var);
 481         *dest = expand_user_path(value);
 482         if (!*dest)
 483                 die("Failed to expand user dir in: '%s'", value);
 484         return 0;
 485 }
 486
 487 static int git_default_core_config(const char *var, const char *value)
 488 {
 489         /* This needs a better name */
 490         if (!strcmp(var, "core.filemode")) {
 491                 trust_executable_bit = git_config_bool(var, value);
 492                 return 0;
 493         }
 494         if (!strcmp(var, "core.trustctime")) {
 495                 trust_ctime = git_config_bool(var, value);
 496                 return 0;
 497         }
 498
 499         if (!strcmp(var, "core.quotepath")) {
 500                 quote_path_fully = git_config_bool(var, value);
 501                 return 0;
 502         }
 503
 504         if (!strcmp(var, "core.symlinks")) {
 505                 has_symlinks = git_config_bool(var, value);
 506                 return 0;
 507         }
 508
 509         if (!strcmp(var, "core.ignorecase")) {
 510                 ignore_case = git_config_bool(var, value);
 511                 return 0;
 512         }
 513
 514         if (!strcmp(var, "core.attributesfile"))
 515                 return git_config_pathname(&git_attributes_file, var, value);
 516
 517         if (!strcmp(var, "core.bare")) {
 518                 is_bare_repository_cfg = git_config_bool(var, value);
 519                 return 0;
 520         }
 521
 522         if (!strcmp(var, "core.ignorestat")) {
 523                 assume_unchanged = git_config_bool(var, value);
 524                 return 0;
 525         }
 526
 527         if (!strcmp(var, "core.prefersymlinkrefs")) {
 528                 prefer_symlink_refs = git_config_bool(var, value);
 529                 return 0;
 530         }
 531
 532         if (!strcmp(var, "core.logallrefupdates")) {
 533                 log_all_ref_updates = git_config_bool(var, value);
 534                 return 0;
 535         }
 536
 537         if (!strcmp(var, "core.warnambiguousrefs")) {
 538                 warn_ambiguous_refs = git_config_bool(var, value);
 539                 return 0;
 540         }
 541
 542         if (!strcmp(var, "core.abbrev")) {
 543                 int abbrev = git_config_int(var, value);
 544                 if (abbrev < minimum_abbrev || abbrev > 40)
 545                         return -1;
 546                 default_abbrev = abbrev;
 547                 return 0;
 548         }
 549
 550         if (!strcmp(var, "core.loosecompression")) {
 551                 int level = git_config_int(var, value);
 552                 if (level == -1)
 553                         level = Z_DEFAULT_COMPRESSION;
 554                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 555                         die("bad zlib compression level %d", level);
 556                 zlib_compression_level = level;
 557                 zlib_compression_seen = 1;
 558                 return 0;
 559         }
 560
 561         if (!strcmp(var, "core.compression")) {
 562                 int level = git_config_int(var, value);
 563                 if (level == -1)
 564                         level = Z_DEFAULT_COMPRESSION;
 565                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 566                         die("bad zlib compression level %d", level);
 567                 core_compression_level = level;
 568                 core_compression_seen = 1;
 569                 if (!zlib_compression_seen)
 570                         zlib_compression_level = level;
 571                 return 0;
 572         }
 573
 574         if (!strcmp(var, "core.packedgitwindowsize")) {
 575                 int pgsz_x2 = getpagesize() * 2;
 576                 packed_git_window_size = git_config_ulong(var, value);
 577
 578                 /* This value must be multiple of (pagesize * 2) */
 579                 packed_git_window_size /= pgsz_x2;
 580                 if (packed_git_window_size < 1)
 581                         packed_git_window_size = 1;
 582                 packed_git_window_size *= pgsz_x2;
 583                 return 0;
 584         }
 585
 586         if (!strcmp(var, "core.bigfilethreshold")) {
 587                 big_file_threshold = git_config_ulong(var, value);
 588                 return 0;
 589         }
 590
 591         if (!strcmp(var, "core.packedgitlimit")) {
 592                 packed_git_limit = git_config_ulong(var, value);
 593                 return 0;
 594         }
 595
 596         if (!strcmp(var, "core.deltabasecachelimit")) {
 597                 delta_base_cache_limit = git_config_ulong(var, value);
 598                 return 0;
 599         }
 600
 601         if (!strcmp(var, "core.logpackaccess"))
 602                 return git_config_string(&log_pack_access, var, value);
 603
 604         if (!strcmp(var, "core.autocrlf")) {
 605                 if (value && !strcasecmp(value, "input")) {
 606                         if (core_eol == EOL_CRLF)
 607                                 return error("core.autocrlf=input conflicts with core.eol=crlf");
 608                         auto_crlf = AUTO_CRLF_INPUT;
 609                         return 0;
 610                 }
 611                 auto_crlf = git_config_bool(var, value);
 612                 return 0;
 613         }
 614
 615         if (!strcmp(var, "core.safecrlf")) {
 616                 if (value && !strcasecmp(value, "warn")) {
 617                         safe_crlf = SAFE_CRLF_WARN;
 618                         return 0;
 619                 }
 620                 safe_crlf = git_config_bool(var, value);
 621                 return 0;
 622         }
 623
 624         if (!strcmp(var, "core.eol")) {
 625                 if (value && !strcasecmp(value, "lf"))
 626                         core_eol = EOL_LF;
 627                 else if (value && !strcasecmp(value, "crlf"))
 628                         core_eol = EOL_CRLF;
 629                 else if (value && !strcasecmp(value, "native"))
 630                         core_eol = EOL_NATIVE;
 631                 else
 632                         core_eol = EOL_UNSET;
 633                 if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 634                         return error("core.autocrlf=input conflicts with core.eol=crlf");
 635                 return 0;
 636         }
 637
 638         if (!strcmp(var, "core.notesref")) {
 639                 notes_ref_name = xstrdup(value);
 640                 return 0;
 641         }
 642
 643         if (!strcmp(var, "core.pager"))
 644                 return git_config_string(&pager_program, var, value);
 645
 646         if (!strcmp(var, "core.editor"))
 647                 return git_config_string(&editor_program, var, value);
 648
 649         if (!strcmp(var, "core.askpass"))
 650                 return git_config_string(&askpass_program, var, value);
 651
 652         if (!strcmp(var, "core.excludesfile"))
 653                 return git_config_pathname(&excludes_file, var, value);
 654
 655         if (!strcmp(var, "core.whitespace")) {
 656                 if (!value)
 657                         return config_error_nonbool(var);
 658                 whitespace_rule_cfg = parse_whitespace_rule(value);
 659                 return 0;
 660         }
 661
 662         if (!strcmp(var, "core.fsyncobjectfiles")) {
 663                 fsync_object_files = git_config_bool(var, value);
 664                 return 0;
 665         }
 666
 667         if (!strcmp(var, "core.preloadindex")) {
 668                 core_preload_index = git_config_bool(var, value);
 669                 return 0;
 670         }
 671
 672         if (!strcmp(var, "core.createobject")) {
 673                 if (!strcmp(value, "rename"))
 674                         object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 675                 else if (!strcmp(value, "link"))
 676                         object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 677                 else
 678                         die("Invalid mode for object creation: %s", value);
 679                 return 0;
 680         }
 681
 682         if (!strcmp(var, "core.sparsecheckout")) {
 683                 core_apply_sparse_checkout = git_config_bool(var, value);
 684                 return 0;
 685         }
 686
 687         /* Add other config variables here and to Documentation/config.txt. */
 688         return 0;
 689 }
 690
 691 static int git_default_user_config(const char *var, const char *value)
 692 {
 693         if (!strcmp(var, "user.name")) {
 694                 if (!value)
 695                         return config_error_nonbool(var);
 696                 strlcpy(git_default_name, value, sizeof(git_default_name));
 697                 user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 698                 return 0;
 699         }
 700
 701         if (!strcmp(var, "user.email")) {
 702                 if (!value)
 703                         return config_error_nonbool(var);
 704                 strlcpy(git_default_email, value, sizeof(git_default_email));
 705                 user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 706                 return 0;
 707         }
 708
 709         /* Add other config variables here and to Documentation/config.txt. */
 710         return 0;
 711 }
 712
 713 static int git_default_i18n_config(const char *var, const char *value)
 714 {
 715         if (!strcmp(var, "i18n.commitencoding"))
 716                 return git_config_string(&git_commit_encoding, var, value);
 717
 718         if (!strcmp(var, "i18n.logoutputencoding"))
 719                 return git_config_string(&git_log_output_encoding, var, value);
 720
 721         /* Add other config variables here and to Documentation/config.txt. */
 722         return 0;
 723 }
 724
 725 static int git_default_branch_config(const char *var, const char *value)
 726 {
 727         if (!strcmp(var, "branch.autosetupmerge")) {
 728                 if (value && !strcasecmp(value, "always")) {
 729                         git_branch_track = BRANCH_TRACK_ALWAYS;
 730                         return 0;
 731                 }
 732                 git_branch_track = git_config_bool(var, value);
 733                 return 0;
 734         }
 735         if (!strcmp(var, "branch.autosetuprebase")) {
 736                 if (!value)
 737                         return config_error_nonbool(var);
 738                 else if (!strcmp(value, "never"))
 739                         autorebase = AUTOREBASE_NEVER;
 740                 else if (!strcmp(value, "local"))
 741                         autorebase = AUTOREBASE_LOCAL;
 742                 else if (!strcmp(value, "remote"))
 743                         autorebase = AUTOREBASE_REMOTE;
 744                 else if (!strcmp(value, "always"))
 745                         autorebase = AUTOREBASE_ALWAYS;
 746                 else
 747                         return error("Malformed value for %s", var);
 748                 return 0;
 749         }
 750
 751         /* Add other config variables here and to Documentation/config.txt. */
 752         return 0;
 753 }
 754
 755 static int git_default_push_config(const char *var, const char *value)
 756 {
 757         if (!strcmp(var, "push.default")) {
 758                 if (!value)
 759                         return config_error_nonbool(var);
 760                 else if (!strcmp(value, "nothing"))
 761                         push_default = PUSH_DEFAULT_NOTHING;
 762                 else if (!strcmp(value, "matching"))
 763                         push_default = PUSH_DEFAULT_MATCHING;
 764                 else if (!strcmp(value, "upstream"))
 765                         push_default = PUSH_DEFAULT_UPSTREAM;
 766                 else if (!strcmp(value, "tracking")) /* deprecated */
 767                         push_default = PUSH_DEFAULT_UPSTREAM;
 768                 else if (!strcmp(value, "current"))
 769                         push_default = PUSH_DEFAULT_CURRENT;
 770                 else {
 771                         error("Malformed value for %s: %s", var, value);
 772                         return error("Must be one of nothing, matching, "
 773                                      "tracking or current.");
 774                 }
 775                 return 0;
 776         }
 777
 778         /* Add other config variables here and to Documentation/config.txt. */
 779         return 0;
 780 }
 781
 782 static int git_default_mailmap_config(const char *var, const char *value)
 783 {
 784         if (!strcmp(var, "mailmap.file"))
 785                 return git_config_string(&git_mailmap_file, var, value);
 786
 787         /* Add other config variables here and to Documentation/config.txt. */
 788         return 0;
 789 }
 790
 791 int git_default_config(const char *var, const char *value, void *dummy)
 792 {
 793         if (!prefixcmp(var, "core."))
 794                 return git_default_core_config(var, value);
 795
 796         if (!prefixcmp(var, "user."))
 797                 return git_default_user_config(var, value);
 798
 799         if (!prefixcmp(var, "i18n."))
 800                 return git_default_i18n_config(var, value);
 801
 802         if (!prefixcmp(var, "branch."))
 803                 return git_default_branch_config(var, value);
 804
 805         if (!prefixcmp(var, "push."))
 806                 return git_default_push_config(var, value);
 807
 808         if (!prefixcmp(var, "mailmap."))
 809                 return git_default_mailmap_config(var, value);
 810
 811         if (!prefixcmp(var, "advice."))
 812                 return git_default_advice_config(var, value);
 813
 814         if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 815                 pager_use_color = git_config_bool(var,value);
 816                 return 0;
 817         }
 818
 819         if (!strcmp(var, "pack.packsizelimit")) {
 820                 pack_size_limit_cfg = git_config_ulong(var, value);
 821                 return 0;
 822         }
 823         /* Add other config variables here and to Documentation/config.txt. */
 824         return 0;
 825 }
 826
 827 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 828 {
 829         int ret;
 830         FILE *f = fopen(filename, "r");
 831
 832         ret = -1;
 833         if (f) {
 834                 config_file top;
 835
 836                 /* push config-file parsing state stack */
 837                 top.prev = cf;
 838                 top.f = f;
 839                 top.name = filename;
 840                 top.linenr = 1;
 841                 top.eof = 0;
 842                 strbuf_init(&top.value, 1024);
 843                 cf = &top;
 844
 845                 ret = git_parse_file(fn, data);
 846
 847                 /* pop config-file parsing state stack */
 848                 strbuf_release(&top.value);
 849                 cf = top.prev;
 850
 851                 fclose(f);
 852         }
 853         return ret;
 854 }
 855
 856 const char *git_etc_gitconfig(void)
 857 {
 858         static const char *system_wide;
 859         if (!system_wide)
 860                 system_wide = system_path(ETC_GITCONFIG);
 861         return system_wide;
 862 }
 863
 864 int git_env_bool(const char *k, int def)
 865 {
 866         const char *v = getenv(k);
 867         return v ? git_config_bool(k, v) : def;
 868 }
 869
 870 int git_config_system(void)
 871 {
 872         return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 873 }
 874
 875 int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 876 {
 877         int ret = 0, found = 0;
 878         const char *home = NULL;
 879
 880         if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 881                 ret += git_config_from_file(fn, git_etc_gitconfig(),
 882                                             data);
 883                 found += 1;
 884         }
 885
 886         home = getenv("HOME");
 887         if (home) {
 888                 char buf[PATH_MAX];
 889                 char *user_config = mksnpath(buf, sizeof(buf), "%s/.gitconfig", home);
 890                 if (!access(user_config, R_OK)) {
 891                         ret += git_config_from_file(fn, user_config, data);
 892                         found += 1;
 893                 }
 894         }
 895
 896         if (repo_config && !access(repo_config, R_OK)) {
 897                 ret += git_config_from_file(fn, repo_config, data);
 898                 found += 1;
 899         }
 900
 901         switch (git_config_from_parameters(fn, data)) {
 902         case -1: /* error */
 903                 die("unable to parse command-line config");
 904                 break;
 905         case 0: /* found nothing */
 906                 break;
 907         default: /* found at least one item */
 908                 found++;
 909                 break;
 910         }
 911
 912         return ret == 0 ? found : ret;
 913 }
 914
 915 int git_config_with_options(config_fn_t fn, void *data,
 916                             const char *filename)
 917 {
 918         char *repo_config = NULL;
 919         int ret;
 920
 921         /*
 922          * If we have a specific filename, use it. Otherwise, follow the
 923          * regular lookup sequence.
 924          */
 925         if (filename)
 926                 return git_config_from_file(fn, filename, data);
 927
 928         repo_config = git_pathdup("config");
 929         ret = git_config_early(fn, data, repo_config);
 930         if (repo_config)
 931                 free(repo_config);
 932         return ret;
 933 }
 934
 935 int git_config(config_fn_t fn, void *data)
 936 {
 937         return git_config_with_options(fn, data, NULL);
 938 }
 939
 940 /*
 941  * Find all the stuff for git_config_set() below.
 942  */
 943
 944 #define MAX_MATCHES 512
 945
 946 static struct {
 947         int baselen;
 948         char *key;
 949         int do_not_match;
 950         regex_t *value_regex;
 951         int multi_replace;
 952         size_t offset[MAX_MATCHES];
 953         enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 954         int seen;
 955 } store;
 956
 957 static int matches(const char *key, const char *value)
 958 {
 959         return !strcmp(key, store.key) &&
 960                 (store.value_regex == NULL ||
 961                  (store.do_not_match ^
 962                   !regexec(store.value_regex, value, 0, NULL, 0)));
 963 }
 964
 965 static int store_aux(const char *key, const char *value, void *cb)
 966 {
 967         const char *ep;
 968         size_t section_len;
 969         FILE *f = cf->f;
 970
 971         switch (store.state) {
 972         case KEY_SEEN:
 973                 if (matches(key, value)) {
 974                         if (store.seen == 1 && store.multi_replace == 0) {
 975                                 warning("%s has multiple values", key);
 976                         } else if (store.seen >= MAX_MATCHES) {
 977                                 error("too many matches for %s", key);
 978                                 return 1;
 979                         }
 980
 981                         store.offset[store.seen] = ftell(f);
 982                         store.seen++;
 983                 }
 984                 break;
 985         case SECTION_SEEN:
 986                 /*
 987                  * What we are looking for is in store.key (both
 988                  * section and var), and its section part is baselen
 989                  * long.  We found key (again, both section and var).
 990                  * We would want to know if this key is in the same
 991                  * section as what we are looking for.  We already
 992                  * know we are in the same section as what should
 993                  * hold store.key.
 994                  */
 995                 ep = strrchr(key, '.');
 996                 section_len = ep - key;
 997
 998                 if ((section_len != store.baselen) ||
 999                     memcmp(key, store.key, section_len+1)) {
1000                         store.state = SECTION_END_SEEN;
1001                         break;
1002                 }
1003
1004                 /*
1005                  * Do not increment matches: this is no match, but we
1006                  * just made sure we are in the desired section.
1007                  */
1008                 store.offset[store.seen] = ftell(f);
1009                 /* fallthru */
1010         case SECTION_END_SEEN:
1011         case START:
1012                 if (matches(key, value)) {
1013                         store.offset[store.seen] = ftell(f);
1014                         store.state = KEY_SEEN;
1015                         store.seen++;
1016                 } else {
1017                         if (strrchr(key, '.') - key == store.baselen &&
1018                               !strncmp(key, store.key, store.baselen)) {
1019                                         store.state = SECTION_SEEN;
1020                                         store.offset[store.seen] = ftell(f);
1021                         }
1022                 }
1023         }
1024         return 0;
1025 }
1026
1027 static int write_error(const char *filename)
1028 {
1029         error("failed to write new configuration file %s", filename);
1030
1031         /* Same error code as "failed to rename". */
1032         return 4;
1033 }
1034
1035 static int store_write_section(int fd, const char *key)
1036 {
1037         const char *dot;
1038         int i, success;
1039         struct strbuf sb = STRBUF_INIT;
1040
1041         dot = memchr(key, '.', store.baselen);
1042         if (dot) {
1043                 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1044                 for (i = dot - key + 1; i < store.baselen; i++) {
1045                         if (key[i] == '"' || key[i] == '\\')
1046                                 strbuf_addch(&sb, '\\');
1047                         strbuf_addch(&sb, key[i]);
1048                 }
1049                 strbuf_addstr(&sb, "\"]\n");
1050         } else {
1051                 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1052         }
1053
1054         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1055         strbuf_release(&sb);
1056
1057         return success;
1058 }
1059
1060 static int store_write_pair(int fd, const char *key, const char *value)
1061 {
1062         int i, success;
1063         int length = strlen(key + store.baselen + 1);
1064         const char *quote = "";
1065         struct strbuf sb = STRBUF_INIT;
1066
1067         /*
1068          * Check to see if the value needs to be surrounded with a dq pair.
1069          * Note that problematic characters are always backslash-quoted; this
1070          * check is about not losing leading or trailing SP and strings that
1071          * follow beginning-of-comment characters (i.e. ';' and '#') by the
1072          * configuration parser.
1073          */
1074         if (value[0] == ' ')
1075                 quote = "\"";
1076         for (i = 0; value[i]; i++)
1077                 if (value[i] == ';' || value[i] == '#')
1078                         quote = "\"";
1079         if (i && value[i - 1] == ' ')
1080                 quote = "\"";
1081
1082         strbuf_addf(&sb, "\t%.*s = %s",
1083                     length, key + store.baselen + 1, quote);
1084
1085         for (i = 0; value[i]; i++)
1086                 switch (value[i]) {
1087                 case '\n':
1088                         strbuf_addstr(&sb, "\\n");
1089                         break;
1090                 case '\t':
1091                         strbuf_addstr(&sb, "\\t");
1092                         break;
1093                 case '"':
1094                 case '\\':
1095                         strbuf_addch(&sb, '\\');
1096                 default:
1097                         strbuf_addch(&sb, value[i]);
1098                         break;
1099                 }
1100         strbuf_addf(&sb, "%s\n", quote);
1101
1102         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1103         strbuf_release(&sb);
1104
1105         return success;
1106 }
1107
1108 static ssize_t find_beginning_of_line(const char *contents, size_t size,
1109         size_t offset_, int *found_bracket)
1110 {
1111         size_t equal_offset = size, bracket_offset = size;
1112         ssize_t offset;
1113
1114 contline:
1115         for (offset = offset_-2; offset > 0
1116                         && contents[offset] != '\n'; offset--)
1117                 switch (contents[offset]) {
1118                         case '=': equal_offset = offset; break;
1119                         case ']': bracket_offset = offset; break;
1120                 }
1121         if (offset > 0 && contents[offset-1] == '\\') {
1122                 offset_ = offset;
1123                 goto contline;
1124         }
1125         if (bracket_offset < equal_offset) {
1126                 *found_bracket = 1;
1127                 offset = bracket_offset+1;
1128         } else
1129                 offset++;
1130
1131         return offset;
1132 }
1133
1134 int git_config_set_in_file(const char *config_filename,
1135                         const char *key, const char *value)
1136 {
1137         return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1138 }
1139
1140 int git_config_set(const char *key, const char *value)
1141 {
1142         return git_config_set_multivar(key, value, NULL, 0);
1143 }
1144
1145 /*
1146  * Auxiliary function to sanity-check and split the key into the section
1147  * identifier and variable name.
1148  *
1149  * Returns 0 on success, -1 when there is an invalid character in the key and
1150  * -2 if there is no section name in the key.
1151  *
1152  * store_key - pointer to char* which will hold a copy of the key with
1153  *             lowercase section and variable name
1154  * baselen - pointer to int which will hold the length of the
1155  *           section + subsection part, can be NULL
1156  */
1157 int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1158 {
1159         int i, dot, baselen;
1160         const char *last_dot = strrchr(key, '.');
1161
1162         /*
1163          * Since "key" actually contains the section name and the real
1164          * key name separated by a dot, we have to know where the dot is.
1165          */
1166
1167         if (last_dot == NULL || last_dot == key) {
1168                 error("key does not contain a section: %s", key);
1169                 return -CONFIG_NO_SECTION_OR_NAME;
1170         }
1171
1172         if (!last_dot[1]) {
1173                 error("key does not contain variable name: %s", key);
1174                 return -CONFIG_NO_SECTION_OR_NAME;
1175         }
1176
1177         baselen = last_dot - key;
1178         if (baselen_)
1179                 *baselen_ = baselen;
1180
1181         /*
1182          * Validate the key and while at it, lower case it for matching.
1183          */
1184         *store_key = xmalloc(strlen(key) + 1);
1185
1186         dot = 0;
1187         for (i = 0; key[i]; i++) {
1188                 unsigned char c = key[i];
1189                 if (c == '.')
1190                         dot = 1;
1191                 /* Leave the extended basename untouched.. */
1192                 if (!dot || i > baselen) {
1193                         if (!iskeychar(c) ||
1194                             (i == baselen + 1 && !isalpha(c))) {
1195                                 error("invalid key: %s", key);
1196                                 goto out_free_ret_1;
1197                         }
1198                         c = tolower(c);
1199                 } else if (c == '\n') {
1200                         error("invalid key (newline): %s", key);
1201                         goto out_free_ret_1;
1202                 }
1203                 (*store_key)[i] = c;
1204         }
1205         (*store_key)[i] = 0;
1206
1207         return 0;
1208
1209 out_free_ret_1:
1210         free(*store_key);
1211         return -CONFIG_INVALID_KEY;
1212 }
1213
1214 /*
1215  * If value==NULL, unset in (remove from) config,
1216  * if value_regex!=NULL, disregard key/value pairs where value does not match.
1217  * if multi_replace==0, nothing, or only one matching key/value is replaced,
1218  *     else all matching key/values (regardless how many) are removed,
1219  *     before the new pair is written.
1220  *
1221  * Returns 0 on success.
1222  *
1223  * This function does this:
1224  *
1225  * - it locks the config file by creating ".git/config.lock"
1226  *
1227  * - it then parses the config using store_aux() as validator to find
1228  *   the position on the key/value pair to replace. If it is to be unset,
1229  *   it must be found exactly once.
1230  *
1231  * - the config file is mmap()ed and the part before the match (if any) is
1232  *   written to the lock file, then the changed part and the rest.
1233  *
1234  * - the config file is removed and the lock file rename()d to it.
1235  *
1236  */
1237 int git_config_set_multivar_in_file(const char *config_filename,
1238                                 const char *key, const char *value,
1239                                 const char *value_regex, int multi_replace)
1240 {
1241         int fd = -1, in_fd;
1242         int ret;
1243         struct lock_file *lock = NULL;
1244         char *filename_buf = NULL;
1245
1246         /* parse-key returns negative; flip the sign to feed exit(3) */
1247         ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1248         if (ret)
1249                 goto out_free;
1250
1251         store.multi_replace = multi_replace;
1252
1253         if (!config_filename)
1254                 config_filename = filename_buf = git_pathdup("config");
1255
1256         /*
1257          * The lock serves a purpose in addition to locking: the new
1258          * contents of .git/config will be written into it.
1259          */
1260         lock = xcalloc(sizeof(struct lock_file), 1);
1261         fd = hold_lock_file_for_update(lock, config_filename, 0);
1262         if (fd < 0) {
1263                 error("could not lock config file %s: %s", config_filename, strerror(errno));
1264                 free(store.key);
1265                 ret = CONFIG_NO_LOCK;
1266                 goto out_free;
1267         }
1268
1269         /*
1270          * If .git/config does not exist yet, write a minimal version.
1271          */
1272         in_fd = open(config_filename, O_RDONLY);
1273         if ( in_fd < 0 ) {
1274                 free(store.key);
1275
1276                 if ( ENOENT != errno ) {
1277                         error("opening %s: %s", config_filename,
1278                               strerror(errno));
1279                         ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1280                         goto out_free;
1281                 }
1282                 /* if nothing to unset, error out */
1283                 if (value == NULL) {
1284                         ret = CONFIG_NOTHING_SET;
1285                         goto out_free;
1286                 }
1287
1288                 store.key = (char *)key;
1289                 if (!store_write_section(fd, key) ||
1290                     !store_write_pair(fd, key, value))
1291                         goto write_err_out;
1292         } else {
1293                 struct stat st;
1294                 char *contents;
1295                 size_t contents_sz, copy_begin, copy_end;
1296                 int i, new_line = 0;
1297
1298                 if (value_regex == NULL)
1299                         store.value_regex = NULL;
1300                 else {
1301                         if (value_regex[0] == '!') {
1302                                 store.do_not_match = 1;
1303                                 value_regex++;
1304                         } else
1305                                 store.do_not_match = 0;
1306
1307                         store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1308                         if (regcomp(store.value_regex, value_regex,
1309                                         REG_EXTENDED)) {
1310                                 error("invalid pattern: %s", value_regex);
1311                                 free(store.value_regex);
1312                                 ret = CONFIG_INVALID_PATTERN;
1313                                 goto out_free;
1314                         }
1315                 }
1316
1317                 store.offset[0] = 0;
1318                 store.state = START;
1319                 store.seen = 0;
1320
1321                 /*
1322                  * After this, store.offset will contain the *end* offset
1323                  * of the last match, or remain at 0 if no match was found.
1324                  * As a side effect, we make sure to transform only a valid
1325                  * existing config file.
1326                  */
1327                 if (git_config_from_file(store_aux, config_filename, NULL)) {
1328                         error("invalid config file %s", config_filename);
1329                         free(store.key);
1330                         if (store.value_regex != NULL) {
1331                                 regfree(store.value_regex);
1332                                 free(store.value_regex);
1333                         }
1334                         ret = CONFIG_INVALID_FILE;
1335                         goto out_free;
1336                 }
1337
1338                 free(store.key);
1339                 if (store.value_regex != NULL) {
1340                         regfree(store.value_regex);
1341                         free(store.value_regex);
1342                 }
1343
1344                 /* if nothing to unset, or too many matches, error out */
1345                 if ((store.seen == 0 && value == NULL) ||
1346                                 (store.seen > 1 && multi_replace == 0)) {
1347                         ret = CONFIG_NOTHING_SET;
1348                         goto out_free;
1349                 }
1350
1351                 fstat(in_fd, &st);
1352                 contents_sz = xsize_t(st.st_size);
1353                 contents = xmmap(NULL, contents_sz, PROT_READ,
1354                         MAP_PRIVATE, in_fd, 0);
1355                 close(in_fd);
1356
1357                 if (store.seen == 0)
1358                         store.seen = 1;
1359
1360                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1361                         if (store.offset[i] == 0) {
1362                                 store.offset[i] = copy_end = contents_sz;
1363                         } else if (store.state != KEY_SEEN) {
1364                                 copy_end = store.offset[i];
1365                         } else
1366                                 copy_end = find_beginning_of_line(
1367                                         contents, contents_sz,
1368                                         store.offset[i]-2, &new_line);
1369
1370                         if (copy_end > 0 && contents[copy_end-1] != '\n')
1371                                 new_line = 1;
1372
1373                         /* write the first part of the config */
1374                         if (copy_end > copy_begin) {
1375                                 if (write_in_full(fd, contents + copy_begin,
1376                                                   copy_end - copy_begin) <
1377                                     copy_end - copy_begin)
1378                                         goto write_err_out;
1379                                 if (new_line &&
1380                                     write_str_in_full(fd, "\n") != 1)
1381                                         goto write_err_out;
1382                         }
1383                         copy_begin = store.offset[i];
1384                 }
1385
1386                 /* write the pair (value == NULL means unset) */
1387                 if (value != NULL) {
1388                         if (store.state == START) {
1389                                 if (!store_write_section(fd, key))
1390                                         goto write_err_out;
1391                         }
1392                         if (!store_write_pair(fd, key, value))
1393                                 goto write_err_out;
1394                 }
1395
1396                 /* write the rest of the config */
1397                 if (copy_begin < contents_sz)
1398                         if (write_in_full(fd, contents + copy_begin,
1399                                           contents_sz - copy_begin) <
1400                             contents_sz - copy_begin)
1401                                 goto write_err_out;
1402
1403                 munmap(contents, contents_sz);
1404         }
1405
1406         if (commit_lock_file(lock) < 0) {
1407                 error("could not commit config file %s", config_filename);
1408                 ret = CONFIG_NO_WRITE;
1409                 goto out_free;
1410         }
1411
1412         /*
1413          * lock is committed, so don't try to roll it back below.
1414          * NOTE: Since lockfile.c keeps a linked list of all created
1415          * lock_file structures, it isn't safe to free(lock).  It's
1416          * better to just leave it hanging around.
1417          */
1418         lock = NULL;
1419         ret = 0;
1420
1421 out_free:
1422         if (lock)
1423                 rollback_lock_file(lock);
1424         free(filename_buf);
1425         return ret;
1426
1427 write_err_out:
1428         ret = write_error(lock->filename);
1429         goto out_free;
1430
1431 }
1432
1433 int git_config_set_multivar(const char *key, const char *value,
1434                         const char *value_regex, int multi_replace)
1435 {
1436         return git_config_set_multivar_in_file(NULL, key, value, value_regex,
1437                                                multi_replace);
1438 }
1439
1440 static int section_name_match (const char *buf, const char *name)
1441 {
1442         int i = 0, j = 0, dot = 0;
1443         if (buf[i] != '[')
1444                 return 0;
1445         for (i = 1; buf[i] && buf[i] != ']'; i++) {
1446                 if (!dot && isspace(buf[i])) {
1447                         dot = 1;
1448                         if (name[j++] != '.')
1449                                 break;
1450                         for (i++; isspace(buf[i]); i++)
1451                                 ; /* do nothing */
1452                         if (buf[i] != '"')
1453                                 break;
1454                         continue;
1455                 }
1456                 if (buf[i] == '\\' && dot)
1457                         i++;
1458                 else if (buf[i] == '"' && dot) {
1459                         for (i++; isspace(buf[i]); i++)
1460                                 ; /* do_nothing */
1461                         break;
1462                 }
1463                 if (buf[i] != name[j++])
1464                         break;
1465         }
1466         if (buf[i] == ']' && name[j] == 0) {
1467                 /*
1468                  * We match, now just find the right length offset by
1469                  * gobbling up any whitespace after it, as well
1470                  */
1471                 i++;
1472                 for (; buf[i] && isspace(buf[i]); i++)
1473                         ; /* do nothing */
1474                 return i;
1475         }
1476         return 0;
1477 }
1478
1479 /* if new_name == NULL, the section is removed instead */
1480 int git_config_rename_section_in_file(const char *config_filename,
1481                                       const char *old_name, const char *new_name)
1482 {
1483         int ret = 0, remove = 0;
1484         char *filename_buf = NULL;
1485         struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1486         int out_fd;
1487         char buf[1024];
1488         FILE *config_file;
1489
1490         if (!config_filename)
1491                 config_filename = filename_buf = git_pathdup("config");
1492
1493         out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1494         if (out_fd < 0) {
1495                 ret = error("could not lock config file %s", config_filename);
1496                 goto out;
1497         }
1498
1499         if (!(config_file = fopen(config_filename, "rb"))) {
1500                 /* no config file means nothing to rename, no error */
1501                 goto unlock_and_out;
1502         }
1503
1504         while (fgets(buf, sizeof(buf), config_file)) {
1505                 int i;
1506                 int length;
1507                 char *output = buf;
1508                 for (i = 0; buf[i] && isspace(buf[i]); i++)
1509                         ; /* do nothing */
1510                 if (buf[i] == '[') {
1511                         /* it's a section */
1512                         int offset = section_name_match(&buf[i], old_name);
1513                         if (offset > 0) {
1514                                 ret++;
1515                                 if (new_name == NULL) {
1516                                         remove = 1;
1517                                         continue;
1518                                 }
1519                                 store.baselen = strlen(new_name);
1520                                 if (!store_write_section(out_fd, new_name)) {
1521                                         ret = write_error(lock->filename);
1522                                         goto out;
1523                                 }
1524                                 /*
1525                                  * We wrote out the new section, with
1526                                  * a newline, now skip the old
1527                                  * section's length
1528                                  */
1529                                 output += offset + i;
1530                                 if (strlen(output) > 0) {
1531                                         /*
1532                                          * More content means there's
1533                                          * a declaration to put on the
1534                                          * next line; indent with a
1535                                          * tab
1536                                          */
1537                                         output -= 1;
1538                                         output[0] = '\t';
1539                                 }
1540                         }
1541                         remove = 0;
1542                 }
1543                 if (remove)
1544                         continue;
1545                 length = strlen(output);
1546                 if (write_in_full(out_fd, output, length) != length) {
1547                         ret = write_error(lock->filename);
1548                         goto out;
1549                 }
1550         }
1551         fclose(config_file);
1552 unlock_and_out:
1553         if (commit_lock_file(lock) < 0)
1554                 ret = error("could not commit config file %s", config_filename);
1555 out:
1556         free(filename_buf);
1557         return ret;
1558 }
1559
1560 int git_config_rename_section(const char *old_name, const char *new_name)
1561 {
1562         return git_config_rename_section_in_file(NULL, old_name, new_name);
1563 }
1564
1565 /*
1566  * Call this to report error for your variable that should not
1567  * get a boolean value (i.e. "[my] var" means "true").
1568  */
1569 int config_error_nonbool(const char *var)
1570 {
1571         return error("Missing value for '%s'", var);
1572 }