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         if (!strcmp(var, "pack.packsizelimit")) {
 822                 pack_size_limit_cfg = git_config_ulong(var, value);
 823                 return 0;
 824         }
 825         /* Add other config variables here and to Documentation/config.txt. */
 826         return 0;
 827 }
 828
 829 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 830 {
 831         int ret;
 832         FILE *f = fopen(filename, "r");
 833
 834         ret = -1;
 835         if (f) {
 836                 config_file top;
 837
 838                 /* push config-file parsing state stack */
 839                 top.prev = cf;
 840                 top.f = f;
 841                 top.name = filename;
 842                 top.linenr = 1;
 843                 top.eof = 0;
 844                 strbuf_init(&top.value, 1024);
 845                 cf = &top;
 846
 847                 ret = git_parse_file(fn, data);
 848
 849                 /* pop config-file parsing state stack */
 850                 strbuf_release(&top.value);
 851                 cf = top.prev;
 852
 853                 fclose(f);
 854         }
 855         return ret;
 856 }
 857
 858 const char *git_etc_gitconfig(void)
 859 {
 860         static const char *system_wide;
 861         if (!system_wide)
 862                 system_wide = system_path(ETC_GITCONFIG);
 863         return system_wide;
 864 }
 865
 866 int git_env_bool(const char *k, int def)
 867 {
 868         const char *v = getenv(k);
 869         return v ? git_config_bool(k, v) : def;
 870 }
 871
 872 int git_config_system(void)
 873 {
 874         return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 875 }
 876
 877 int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 878 {
 879         int ret = 0, found = 0;
 880         const char *home = NULL;
 881
 882         if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 883                 ret += git_config_from_file(fn, git_etc_gitconfig(),
 884                                             data);
 885                 found += 1;
 886         }
 887
 888         home = getenv("HOME");
 889         if (home) {
 890                 char buf[PATH_MAX];
 891                 char *user_config = mksnpath(buf, sizeof(buf), "%s/.gitconfig", home);
 892                 if (!access(user_config, R_OK)) {
 893                         ret += git_config_from_file(fn, user_config, data);
 894                         found += 1;
 895                 }
 896         }
 897
 898         if (repo_config && !access(repo_config, R_OK)) {
 899                 ret += git_config_from_file(fn, repo_config, data);
 900                 found += 1;
 901         }
 902
 903         switch (git_config_from_parameters(fn, data)) {
 904         case -1: /* error */
 905                 die("unable to parse command-line config");
 906                 break;
 907         case 0: /* found nothing */
 908                 break;
 909         default: /* found at least one item */
 910                 found++;
 911                 break;
 912         }
 913
 914         return ret == 0 ? found : ret;
 915 }
 916
 917 int git_config_with_options(config_fn_t fn, void *data,
 918                             const char *filename)
 919 {
 920         char *repo_config = NULL;
 921         int ret;
 922
 923         /*
 924          * If we have a specific filename, use it. Otherwise, follow the
 925          * regular lookup sequence.
 926          */
 927         if (filename)
 928                 return git_config_from_file(fn, filename, data);
 929
 930         repo_config = git_pathdup("config");
 931         ret = git_config_early(fn, data, repo_config);
 932         if (repo_config)
 933                 free(repo_config);
 934         return ret;
 935 }
 936
 937 int git_config(config_fn_t fn, void *data)
 938 {
 939         return git_config_with_options(fn, data, config_exclusive_filename);
 940 }
 941
 942 /*
 943  * Find all the stuff for git_config_set() below.
 944  */
 945
 946 #define MAX_MATCHES 512
 947
 948 static struct {
 949         int baselen;
 950         char *key;
 951         int do_not_match;
 952         regex_t *value_regex;
 953         int multi_replace;
 954         size_t offset[MAX_MATCHES];
 955         enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 956         int seen;
 957 } store;
 958
 959 static int matches(const char *key, const char *value)
 960 {
 961         return !strcmp(key, store.key) &&
 962                 (store.value_regex == NULL ||
 963                  (store.do_not_match ^
 964                   !regexec(store.value_regex, value, 0, NULL, 0)));
 965 }
 966
 967 static int store_aux(const char *key, const char *value, void *cb)
 968 {
 969         const char *ep;
 970         size_t section_len;
 971         FILE *f = cf->f;
 972
 973         switch (store.state) {
 974         case KEY_SEEN:
 975                 if (matches(key, value)) {
 976                         if (store.seen == 1 && store.multi_replace == 0) {
 977                                 warning("%s has multiple values", key);
 978                         } else if (store.seen >= MAX_MATCHES) {
 979                                 error("too many matches for %s", key);
 980                                 return 1;
 981                         }
 982
 983                         store.offset[store.seen] = ftell(f);
 984                         store.seen++;
 985                 }
 986                 break;
 987         case SECTION_SEEN:
 988                 /*
 989                  * What we are looking for is in store.key (both
 990                  * section and var), and its section part is baselen
 991                  * long.  We found key (again, both section and var).
 992                  * We would want to know if this key is in the same
 993                  * section as what we are looking for.  We already
 994                  * know we are in the same section as what should
 995                  * hold store.key.
 996                  */
 997                 ep = strrchr(key, '.');
 998                 section_len = ep - key;
 999
1000                 if ((section_len != store.baselen) ||
1001                     memcmp(key, store.key, section_len+1)) {
1002                         store.state = SECTION_END_SEEN;
1003                         break;
1004                 }
1005
1006                 /*
1007                  * Do not increment matches: this is no match, but we
1008                  * just made sure we are in the desired section.
1009                  */
1010                 store.offset[store.seen] = ftell(f);
1011                 /* fallthru */
1012         case SECTION_END_SEEN:
1013         case START:
1014                 if (matches(key, value)) {
1015                         store.offset[store.seen] = ftell(f);
1016                         store.state = KEY_SEEN;
1017                         store.seen++;
1018                 } else {
1019                         if (strrchr(key, '.') - key == store.baselen &&
1020                               !strncmp(key, store.key, store.baselen)) {
1021                                         store.state = SECTION_SEEN;
1022                                         store.offset[store.seen] = ftell(f);
1023                         }
1024                 }
1025         }
1026         return 0;
1027 }
1028
1029 static int write_error(const char *filename)
1030 {
1031         error("failed to write new configuration file %s", filename);
1032
1033         /* Same error code as "failed to rename". */
1034         return 4;
1035 }
1036
1037 static int store_write_section(int fd, const char *key)
1038 {
1039         const char *dot;
1040         int i, success;
1041         struct strbuf sb = STRBUF_INIT;
1042
1043         dot = memchr(key, '.', store.baselen);
1044         if (dot) {
1045                 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1046                 for (i = dot - key + 1; i < store.baselen; i++) {
1047                         if (key[i] == '"' || key[i] == '\\')
1048                                 strbuf_addch(&sb, '\\');
1049                         strbuf_addch(&sb, key[i]);
1050                 }
1051                 strbuf_addstr(&sb, "\"]\n");
1052         } else {
1053                 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1054         }
1055
1056         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1057         strbuf_release(&sb);
1058
1059         return success;
1060 }
1061
1062 static int store_write_pair(int fd, const char *key, const char *value)
1063 {
1064         int i, success;
1065         int length = strlen(key + store.baselen + 1);
1066         const char *quote = "";
1067         struct strbuf sb = STRBUF_INIT;
1068
1069         /*
1070          * Check to see if the value needs to be surrounded with a dq pair.
1071          * Note that problematic characters are always backslash-quoted; this
1072          * check is about not losing leading or trailing SP and strings that
1073          * follow beginning-of-comment characters (i.e. ';' and '#') by the
1074          * configuration parser.
1075          */
1076         if (value[0] == ' ')
1077                 quote = "\"";
1078         for (i = 0; value[i]; i++)
1079                 if (value[i] == ';' || value[i] == '#')
1080                         quote = "\"";
1081         if (i && value[i - 1] == ' ')
1082                 quote = "\"";
1083
1084         strbuf_addf(&sb, "\t%.*s = %s",
1085                     length, key + store.baselen + 1, quote);
1086
1087         for (i = 0; value[i]; i++)
1088                 switch (value[i]) {
1089                 case '\n':
1090                         strbuf_addstr(&sb, "\\n");
1091                         break;
1092                 case '\t':
1093                         strbuf_addstr(&sb, "\\t");
1094                         break;
1095                 case '"':
1096                 case '\\':
1097                         strbuf_addch(&sb, '\\');
1098                 default:
1099                         strbuf_addch(&sb, value[i]);
1100                         break;
1101                 }
1102         strbuf_addf(&sb, "%s\n", quote);
1103
1104         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1105         strbuf_release(&sb);
1106
1107         return success;
1108 }
1109
1110 static ssize_t find_beginning_of_line(const char *contents, size_t size,
1111         size_t offset_, int *found_bracket)
1112 {
1113         size_t equal_offset = size, bracket_offset = size;
1114         ssize_t offset;
1115
1116 contline:
1117         for (offset = offset_-2; offset > 0
1118                         && contents[offset] != '\n'; offset--)
1119                 switch (contents[offset]) {
1120                         case '=': equal_offset = offset; break;
1121                         case ']': bracket_offset = offset; break;
1122                 }
1123         if (offset > 0 && contents[offset-1] == '\\') {
1124                 offset_ = offset;
1125                 goto contline;
1126         }
1127         if (bracket_offset < equal_offset) {
1128                 *found_bracket = 1;
1129                 offset = bracket_offset+1;
1130         } else
1131                 offset++;
1132
1133         return offset;
1134 }
1135
1136 int git_config_set_in_file(const char *config_filename,
1137                         const char *key, const char *value)
1138 {
1139         return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1140 }
1141
1142 int git_config_set(const char *key, const char *value)
1143 {
1144         return git_config_set_multivar(key, value, NULL, 0);
1145 }
1146
1147 /*
1148  * Auxiliary function to sanity-check and split the key into the section
1149  * identifier and variable name.
1150  *
1151  * Returns 0 on success, -1 when there is an invalid character in the key and
1152  * -2 if there is no section name in the key.
1153  *
1154  * store_key - pointer to char* which will hold a copy of the key with
1155  *             lowercase section and variable name
1156  * baselen - pointer to int which will hold the length of the
1157  *           section + subsection part, can be NULL
1158  */
1159 int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1160 {
1161         int i, dot, baselen;
1162         const char *last_dot = strrchr(key, '.');
1163
1164         /*
1165          * Since "key" actually contains the section name and the real
1166          * key name separated by a dot, we have to know where the dot is.
1167          */
1168
1169         if (last_dot == NULL || last_dot == key) {
1170                 error("key does not contain a section: %s", key);
1171                 return -CONFIG_NO_SECTION_OR_NAME;
1172         }
1173
1174         if (!last_dot[1]) {
1175                 error("key does not contain variable name: %s", key);
1176                 return -CONFIG_NO_SECTION_OR_NAME;
1177         }
1178
1179         baselen = last_dot - key;
1180         if (baselen_)
1181                 *baselen_ = baselen;
1182
1183         /*
1184          * Validate the key and while at it, lower case it for matching.
1185          */
1186         *store_key = xmalloc(strlen(key) + 1);
1187
1188         dot = 0;
1189         for (i = 0; key[i]; i++) {
1190                 unsigned char c = key[i];
1191                 if (c == '.')
1192                         dot = 1;
1193                 /* Leave the extended basename untouched.. */
1194                 if (!dot || i > baselen) {
1195                         if (!iskeychar(c) ||
1196                             (i == baselen + 1 && !isalpha(c))) {
1197                                 error("invalid key: %s", key);
1198                                 goto out_free_ret_1;
1199                         }
1200                         c = tolower(c);
1201                 } else if (c == '\n') {
1202                         error("invalid key (newline): %s", key);
1203                         goto out_free_ret_1;
1204                 }
1205                 (*store_key)[i] = c;
1206         }
1207         (*store_key)[i] = 0;
1208
1209         return 0;
1210
1211 out_free_ret_1:
1212         free(*store_key);
1213         return -CONFIG_INVALID_KEY;
1214 }
1215
1216 /*
1217  * If value==NULL, unset in (remove from) config,
1218  * if value_regex!=NULL, disregard key/value pairs where value does not match.
1219  * if multi_replace==0, nothing, or only one matching key/value is replaced,
1220  *     else all matching key/values (regardless how many) are removed,
1221  *     before the new pair is written.
1222  *
1223  * Returns 0 on success.
1224  *
1225  * This function does this:
1226  *
1227  * - it locks the config file by creating ".git/config.lock"
1228  *
1229  * - it then parses the config using store_aux() as validator to find
1230  *   the position on the key/value pair to replace. If it is to be unset,
1231  *   it must be found exactly once.
1232  *
1233  * - the config file is mmap()ed and the part before the match (if any) is
1234  *   written to the lock file, then the changed part and the rest.
1235  *
1236  * - the config file is removed and the lock file rename()d to it.
1237  *
1238  */
1239 int git_config_set_multivar_in_file(const char *config_filename,
1240                                 const char *key, const char *value,
1241                                 const char *value_regex, int multi_replace)
1242 {
1243         int fd = -1, in_fd;
1244         int ret;
1245         struct lock_file *lock = NULL;
1246         char *filename_buf = NULL;
1247
1248         /* parse-key returns negative; flip the sign to feed exit(3) */
1249         ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1250         if (ret)
1251                 goto out_free;
1252
1253         store.multi_replace = multi_replace;
1254
1255         if (!config_filename)
1256                 config_filename = filename_buf = git_pathdup("config");
1257
1258         /*
1259          * The lock serves a purpose in addition to locking: the new
1260          * contents of .git/config will be written into it.
1261          */
1262         lock = xcalloc(sizeof(struct lock_file), 1);
1263         fd = hold_lock_file_for_update(lock, config_filename, 0);
1264         if (fd < 0) {
1265                 error("could not lock config file %s: %s", config_filename, strerror(errno));
1266                 free(store.key);
1267                 ret = CONFIG_NO_LOCK;
1268                 goto out_free;
1269         }
1270
1271         /*
1272          * If .git/config does not exist yet, write a minimal version.
1273          */
1274         in_fd = open(config_filename, O_RDONLY);
1275         if ( in_fd < 0 ) {
1276                 free(store.key);
1277
1278                 if ( ENOENT != errno ) {
1279                         error("opening %s: %s", config_filename,
1280                               strerror(errno));
1281                         ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1282                         goto out_free;
1283                 }
1284                 /* if nothing to unset, error out */
1285                 if (value == NULL) {
1286                         ret = CONFIG_NOTHING_SET;
1287                         goto out_free;
1288                 }
1289
1290                 store.key = (char *)key;
1291                 if (!store_write_section(fd, key) ||
1292                     !store_write_pair(fd, key, value))
1293                         goto write_err_out;
1294         } else {
1295                 struct stat st;
1296                 char *contents;
1297                 size_t contents_sz, copy_begin, copy_end;
1298                 int i, new_line = 0;
1299
1300                 if (value_regex == NULL)
1301                         store.value_regex = NULL;
1302                 else {
1303                         if (value_regex[0] == '!') {
1304                                 store.do_not_match = 1;
1305                                 value_regex++;
1306                         } else
1307                                 store.do_not_match = 0;
1308
1309                         store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1310                         if (regcomp(store.value_regex, value_regex,
1311                                         REG_EXTENDED)) {
1312                                 error("invalid pattern: %s", value_regex);
1313                                 free(store.value_regex);
1314                                 ret = CONFIG_INVALID_PATTERN;
1315                                 goto out_free;
1316                         }
1317                 }
1318
1319                 store.offset[0] = 0;
1320                 store.state = START;
1321                 store.seen = 0;
1322
1323                 /*
1324                  * After this, store.offset will contain the *end* offset
1325                  * of the last match, or remain at 0 if no match was found.
1326                  * As a side effect, we make sure to transform only a valid
1327                  * existing config file.
1328                  */
1329                 if (git_config_from_file(store_aux, config_filename, NULL)) {
1330                         error("invalid config file %s", config_filename);
1331                         free(store.key);
1332                         if (store.value_regex != NULL) {
1333                                 regfree(store.value_regex);
1334                                 free(store.value_regex);
1335                         }
1336                         ret = CONFIG_INVALID_FILE;
1337                         goto out_free;
1338                 }
1339
1340                 free(store.key);
1341                 if (store.value_regex != NULL) {
1342                         regfree(store.value_regex);
1343                         free(store.value_regex);
1344                 }
1345
1346                 /* if nothing to unset, or too many matches, error out */
1347                 if ((store.seen == 0 && value == NULL) ||
1348                                 (store.seen > 1 && multi_replace == 0)) {
1349                         ret = CONFIG_NOTHING_SET;
1350                         goto out_free;
1351                 }
1352
1353                 fstat(in_fd, &st);
1354                 contents_sz = xsize_t(st.st_size);
1355                 contents = xmmap(NULL, contents_sz, PROT_READ,
1356                         MAP_PRIVATE, in_fd, 0);
1357                 close(in_fd);
1358
1359                 if (store.seen == 0)
1360                         store.seen = 1;
1361
1362                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1363                         if (store.offset[i] == 0) {
1364                                 store.offset[i] = copy_end = contents_sz;
1365                         } else if (store.state != KEY_SEEN) {
1366                                 copy_end = store.offset[i];
1367                         } else
1368                                 copy_end = find_beginning_of_line(
1369                                         contents, contents_sz,
1370                                         store.offset[i]-2, &new_line);
1371
1372                         if (copy_end > 0 && contents[copy_end-1] != '\n')
1373                                 new_line = 1;
1374
1375                         /* write the first part of the config */
1376                         if (copy_end > copy_begin) {
1377                                 if (write_in_full(fd, contents + copy_begin,
1378                                                   copy_end - copy_begin) <
1379                                     copy_end - copy_begin)
1380                                         goto write_err_out;
1381                                 if (new_line &&
1382                                     write_str_in_full(fd, "\n") != 1)
1383                                         goto write_err_out;
1384                         }
1385                         copy_begin = store.offset[i];
1386                 }
1387
1388                 /* write the pair (value == NULL means unset) */
1389                 if (value != NULL) {
1390                         if (store.state == START) {
1391                                 if (!store_write_section(fd, key))
1392                                         goto write_err_out;
1393                         }
1394                         if (!store_write_pair(fd, key, value))
1395                                 goto write_err_out;
1396                 }
1397
1398                 /* write the rest of the config */
1399                 if (copy_begin < contents_sz)
1400                         if (write_in_full(fd, contents + copy_begin,
1401                                           contents_sz - copy_begin) <
1402                             contents_sz - copy_begin)
1403                                 goto write_err_out;
1404
1405                 munmap(contents, contents_sz);
1406         }
1407
1408         if (commit_lock_file(lock) < 0) {
1409                 error("could not commit config file %s", config_filename);
1410                 ret = CONFIG_NO_WRITE;
1411                 goto out_free;
1412         }
1413
1414         /*
1415          * lock is committed, so don't try to roll it back below.
1416          * NOTE: Since lockfile.c keeps a linked list of all created
1417          * lock_file structures, it isn't safe to free(lock).  It's
1418          * better to just leave it hanging around.
1419          */
1420         lock = NULL;
1421         ret = 0;
1422
1423 out_free:
1424         if (lock)
1425                 rollback_lock_file(lock);
1426         free(filename_buf);
1427         return ret;
1428
1429 write_err_out:
1430         ret = write_error(lock->filename);
1431         goto out_free;
1432
1433 }
1434
1435 int git_config_set_multivar(const char *key, const char *value,
1436                         const char *value_regex, int multi_replace)
1437 {
1438         return git_config_set_multivar_in_file(config_exclusive_filename,
1439                                                key, value, value_regex,
1440                                                multi_replace);
1441 }
1442
1443 static int section_name_match (const char *buf, const char *name)
1444 {
1445         int i = 0, j = 0, dot = 0;
1446         if (buf[i] != '[')
1447                 return 0;
1448         for (i = 1; buf[i] && buf[i] != ']'; i++) {
1449                 if (!dot && isspace(buf[i])) {
1450                         dot = 1;
1451                         if (name[j++] != '.')
1452                                 break;
1453                         for (i++; isspace(buf[i]); i++)
1454                                 ; /* do nothing */
1455                         if (buf[i] != '"')
1456                                 break;
1457                         continue;
1458                 }
1459                 if (buf[i] == '\\' && dot)
1460                         i++;
1461                 else if (buf[i] == '"' && dot) {
1462                         for (i++; isspace(buf[i]); i++)
1463                                 ; /* do_nothing */
1464                         break;
1465                 }
1466                 if (buf[i] != name[j++])
1467                         break;
1468         }
1469         if (buf[i] == ']' && name[j] == 0) {
1470                 /*
1471                  * We match, now just find the right length offset by
1472                  * gobbling up any whitespace after it, as well
1473                  */
1474                 i++;
1475                 for (; buf[i] && isspace(buf[i]); i++)
1476                         ; /* do nothing */
1477                 return i;
1478         }
1479         return 0;
1480 }
1481
1482 /* if new_name == NULL, the section is removed instead */
1483 int git_config_rename_section_in_file(const char *config_filename,
1484                                       const char *old_name, const char *new_name)
1485 {
1486         int ret = 0, remove = 0;
1487         char *filename_buf = NULL;
1488         struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1489         int out_fd;
1490         char buf[1024];
1491         FILE *config_file;
1492
1493         if (!config_filename)
1494                 config_filename = filename_buf = git_pathdup("config");
1495
1496         out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1497         if (out_fd < 0) {
1498                 ret = error("could not lock config file %s", config_filename);
1499                 goto out;
1500         }
1501
1502         if (!(config_file = fopen(config_filename, "rb"))) {
1503                 /* no config file means nothing to rename, no error */
1504                 goto unlock_and_out;
1505         }
1506
1507         while (fgets(buf, sizeof(buf), config_file)) {
1508                 int i;
1509                 int length;
1510                 char *output = buf;
1511                 for (i = 0; buf[i] && isspace(buf[i]); i++)
1512                         ; /* do nothing */
1513                 if (buf[i] == '[') {
1514                         /* it's a section */
1515                         int offset = section_name_match(&buf[i], old_name);
1516                         if (offset > 0) {
1517                                 ret++;
1518                                 if (new_name == NULL) {
1519                                         remove = 1;
1520                                         continue;
1521                                 }
1522                                 store.baselen = strlen(new_name);
1523                                 if (!store_write_section(out_fd, new_name)) {
1524                                         ret = write_error(lock->filename);
1525                                         goto out;
1526                                 }
1527                                 /*
1528                                  * We wrote out the new section, with
1529                                  * a newline, now skip the old
1530                                  * section's length
1531                                  */
1532                                 output += offset + i;
1533                                 if (strlen(output) > 0) {
1534                                         /*
1535                                          * More content means there's
1536                                          * a declaration to put on the
1537                                          * next line; indent with a
1538                                          * tab
1539                                          */
1540                                         output -= 1;
1541                                         output[0] = '\t';
1542                                 }
1543                         }
1544                         remove = 0;
1545                 }
1546                 if (remove)
1547                         continue;
1548                 length = strlen(output);
1549                 if (write_in_full(out_fd, output, length) != length) {
1550                         ret = write_error(lock->filename);
1551                         goto out;
1552                 }
1553         }
1554         fclose(config_file);
1555 unlock_and_out:
1556         if (commit_lock_file(lock) < 0)
1557                 ret = error("could not commit config file %s", config_filename);
1558 out:
1559         free(filename_buf);
1560         return ret;
1561 }
1562
1563 int git_config_rename_section(const char *old_name, const char *new_name)
1564 {
1565         return git_config_rename_section_in_file(config_exclusive_filename,
1566                                                  old_name, new_name);
1567 }
1568
1569 /*
1570  * Call this to report error for your variable that should not
1571  * get a boolean value (i.e. "[my] var" means "true").
1572  */
1573 int config_error_nonbool(const char *var)
1574 {
1575         return error("Missing value for '%s'", var);
1576 }