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 #define MAX_INCLUDE_DEPTH 10
  30 static const char include_depth_advice[] =
  31 "exceeded maximum include depth (%d) while including\n"
  32 "       %s\n"
  33 "from\n"
  34 "       %s\n"
  35 "Do you have circular includes?";
  36 static int handle_path_include(const char *path, struct config_include_data *inc)
  37 {
  38         int ret = 0;
  39         struct strbuf buf = STRBUF_INIT;
  40         char *expanded;
  41
  42         if (!path)
  43                 return config_error_nonbool("include.path");
  44
  45         expanded = expand_user_path(path);
  46         if (!expanded)
  47                 return error("Could not expand include path '%s'", path);
  48         path = expanded;
  49
  50         /*
  51          * Use an absolute path as-is, but interpret relative paths
  52          * based on the including config file.
  53          */
  54         if (!is_absolute_path(path)) {
  55                 char *slash;
  56
  57                 if (!cf || !cf->name)
  58                         return error("relative config includes must come from files");
  59
  60                 slash = find_last_dir_sep(cf->name);
  61                 if (slash)
  62                         strbuf_add(&buf, cf->name, slash - cf->name + 1);
  63                 strbuf_addstr(&buf, path);
  64                 path = buf.buf;
  65         }
  66
  67         if (!access(path, R_OK)) {
  68                 if (++inc->depth > MAX_INCLUDE_DEPTH)
  69                         die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
  70                             cf && cf->name ? cf->name : "the command line");
  71                 ret = git_config_from_file(git_config_include, path, inc);
  72                 inc->depth--;
  73         }
  74         strbuf_release(&buf);
  75         free(expanded);
  76         return ret;
  77 }
  78
  79 int git_config_include(const char *var, const char *value, void *data)
  80 {
  81         struct config_include_data *inc = data;
  82         const char *type;
  83         int ret;
  84
  85         /*
  86          * Pass along all values, including "include" directives; this makes it
  87          * possible to query information on the includes themselves.
  88          */
  89         ret = inc->fn(var, value, inc->data);
  90         if (ret < 0)
  91                 return ret;
  92
  93         type = skip_prefix(var, "include.");
  94         if (!type)
  95                 return ret;
  96
  97         if (!strcmp(type, "path"))
  98                 ret = handle_path_include(value, inc);
  99         return ret;
 100 }
 101
 102 static void lowercase(char *p)
 103 {
 104         for (; *p; p++)
 105                 *p = tolower(*p);
 106 }
 107
 108 void git_config_push_parameter(const char *text)
 109 {
 110         struct strbuf env = STRBUF_INIT;
 111         const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
 112         if (old) {
 113                 strbuf_addstr(&env, old);
 114                 strbuf_addch(&env, ' ');
 115         }
 116         sq_quote_buf(&env, text);
 117         setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
 118         strbuf_release(&env);
 119 }
 120
 121 int git_config_parse_parameter(const char *text,
 122                                config_fn_t fn, void *data)
 123 {
 124         struct strbuf **pair;
 125         pair = strbuf_split_str(text, '=', 2);
 126         if (!pair[0])
 127                 return error("bogus config parameter: %s", text);
 128         if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
 129                 strbuf_setlen(pair[0], pair[0]->len - 1);
 130         strbuf_trim(pair[0]);
 131         if (!pair[0]->len) {
 132                 strbuf_list_free(pair);
 133                 return error("bogus config parameter: %s", text);
 134         }
 135         lowercase(pair[0]->buf);
 136         if (fn(pair[0]->buf, pair[1] ? pair[1]->buf : NULL, data) < 0) {
 137                 strbuf_list_free(pair);
 138                 return -1;
 139         }
 140         strbuf_list_free(pair);
 141         return 0;
 142 }
 143
 144 int git_config_from_parameters(config_fn_t fn, void *data)
 145 {
 146         const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 147         char *envw;
 148         const char **argv = NULL;
 149         int nr = 0, alloc = 0;
 150         int i;
 151
 152         if (!env)
 153                 return 0;
 154         /* sq_dequote will write over it */
 155         envw = xstrdup(env);
 156
 157         if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 158                 free(envw);
 159                 return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
 160         }
 161
 162         for (i = 0; i < nr; i++) {
 163                 if (git_config_parse_parameter(argv[i], fn, data) < 0) {
 164                         free(argv);
 165                         free(envw);
 166                         return -1;
 167                 }
 168         }
 169
 170         free(argv);
 171         free(envw);
 172         return nr > 0;
 173 }
 174
 175 static int get_next_char(void)
 176 {
 177         int c;
 178         FILE *f;
 179
 180         c = '\n';
 181         if (cf && ((f = cf->f) != NULL)) {
 182                 c = fgetc(f);
 183                 if (c == '\r') {
 184                         /* DOS like systems */
 185                         c = fgetc(f);
 186                         if (c != '\n') {
 187                                 ungetc(c, f);
 188                                 c = '\r';
 189                         }
 190                 }
 191                 if (c == '\n')
 192                         cf->linenr++;
 193                 if (c == EOF) {
 194                         cf->eof = 1;
 195                         c = '\n';
 196                 }
 197         }
 198         return c;
 199 }
 200
 201 static char *parse_value(void)
 202 {
 203         int quote = 0, comment = 0, space = 0;
 204
 205         strbuf_reset(&cf->value);
 206         for (;;) {
 207                 int c = get_next_char();
 208                 if (c == '\n') {
 209                         if (quote) {
 210                                 cf->linenr--;
 211                                 return NULL;
 212                         }
 213                         return cf->value.buf;
 214                 }
 215                 if (comment)
 216                         continue;
 217                 if (isspace(c) && !quote) {
 218                         if (cf->value.len)
 219                                 space++;
 220                         continue;
 221                 }
 222                 if (!quote) {
 223                         if (c == ';' || c == '#') {
 224                                 comment = 1;
 225                                 continue;
 226                         }
 227                 }
 228                 for (; space; space--)
 229                         strbuf_addch(&cf->value, ' ');
 230                 if (c == '\\') {
 231                         c = get_next_char();
 232                         switch (c) {
 233                         case '\n':
 234                                 continue;
 235                         case 't':
 236                                 c = '\t';
 237                                 break;
 238                         case 'b':
 239                                 c = '\b';
 240                                 break;
 241                         case 'n':
 242                                 c = '\n';
 243                                 break;
 244                         /* Some characters escape as themselves */
 245                         case '\\': case '"':
 246                                 break;
 247                         /* Reject unknown escape sequences */
 248                         default:
 249                                 return NULL;
 250                         }
 251                         strbuf_addch(&cf->value, c);
 252                         continue;
 253                 }
 254                 if (c == '"') {
 255                         quote = 1-quote;
 256                         continue;
 257                 }
 258                 strbuf_addch(&cf->value, c);
 259         }
 260 }
 261
 262 static inline int iskeychar(int c)
 263 {
 264         return isalnum(c) || c == '-';
 265 }
 266
 267 static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
 268 {
 269         int c;
 270         char *value;
 271
 272         /* Get the full name */
 273         for (;;) {
 274                 c = get_next_char();
 275                 if (cf->eof)
 276                         break;
 277                 if (!iskeychar(c))
 278                         break;
 279                 name[len++] = tolower(c);
 280                 if (len >= MAXNAME)
 281                         return -1;
 282         }
 283         name[len] = 0;
 284         while (c == ' ' || c == '\t')
 285                 c = get_next_char();
 286
 287         value = NULL;
 288         if (c != '\n') {
 289                 if (c != '=')
 290                         return -1;
 291                 value = parse_value();
 292                 if (!value)
 293                         return -1;
 294         }
 295         return fn(name, value, data);
 296 }
 297
 298 static int get_extended_base_var(char *name, int baselen, int c)
 299 {
 300         do {
 301                 if (c == '\n')
 302                         goto error_incomplete_line;
 303                 c = get_next_char();
 304         } while (isspace(c));
 305
 306         /* We require the format to be '[base "extension"]' */
 307         if (c != '"')
 308                 return -1;
 309         name[baselen++] = '.';
 310
 311         for (;;) {
 312                 int c = get_next_char();
 313                 if (c == '\n')
 314                         goto error_incomplete_line;
 315                 if (c == '"')
 316                         break;
 317                 if (c == '\\') {
 318                         c = get_next_char();
 319                         if (c == '\n')
 320                                 goto error_incomplete_line;
 321                 }
 322                 name[baselen++] = c;
 323                 if (baselen > MAXNAME / 2)
 324                         return -1;
 325         }
 326
 327         /* Final ']' */
 328         if (get_next_char() != ']')
 329                 return -1;
 330         return baselen;
 331 error_incomplete_line:
 332         cf->linenr--;
 333         return -1;
 334 }
 335
 336 static int get_base_var(char *name)
 337 {
 338         int baselen = 0;
 339
 340         for (;;) {
 341                 int c = get_next_char();
 342                 if (cf->eof)
 343                         return -1;
 344                 if (c == ']')
 345                         return baselen;
 346                 if (isspace(c))
 347                         return get_extended_base_var(name, baselen, c);
 348                 if (!iskeychar(c) && c != '.')
 349                         return -1;
 350                 if (baselen > MAXNAME / 2)
 351                         return -1;
 352                 name[baselen++] = tolower(c);
 353         }
 354 }
 355
 356 static int git_parse_file(config_fn_t fn, void *data)
 357 {
 358         int comment = 0;
 359         int baselen = 0;
 360         char *var = cf->var;
 361
 362         /* U+FEFF Byte Order Mark in UTF8 */
 363         static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 364         const unsigned char *bomptr = utf8_bom;
 365
 366         for (;;) {
 367                 int c = get_next_char();
 368                 if (bomptr && *bomptr) {
 369                         /* We are at the file beginning; skip UTF8-encoded BOM
 370                          * if present. Sane editors won't put this in on their
 371                          * own, but e.g. Windows Notepad will do it happily. */
 372                         if ((unsigned char) c == *bomptr) {
 373                                 bomptr++;
 374                                 continue;
 375                         } else {
 376                                 /* Do not tolerate partial BOM. */
 377                                 if (bomptr != utf8_bom)
 378                                         break;
 379                                 /* No BOM at file beginning. Cool. */
 380                                 bomptr = NULL;
 381                         }
 382                 }
 383                 if (c == '\n') {
 384                         if (cf->eof)
 385                                 return 0;
 386                         comment = 0;
 387                         continue;
 388                 }
 389                 if (comment || isspace(c))
 390                         continue;
 391                 if (c == '#' || c == ';') {
 392                         comment = 1;
 393                         continue;
 394                 }
 395                 if (c == '[') {
 396                         baselen = get_base_var(var);
 397                         if (baselen <= 0)
 398                                 break;
 399                         var[baselen++] = '.';
 400                         var[baselen] = 0;
 401                         continue;
 402                 }
 403                 if (!isalpha(c))
 404                         break;
 405                 var[baselen] = tolower(c);
 406                 if (get_value(fn, data, var, baselen+1) < 0)
 407                         break;
 408         }
 409         die("bad config file line %d in %s", cf->linenr, cf->name);
 410 }
 411
 412 static int parse_unit_factor(const char *end, uintmax_t *val)
 413 {
 414         if (!*end)
 415                 return 1;
 416         else if (!strcasecmp(end, "k")) {
 417                 *val *= 1024;
 418                 return 1;
 419         }
 420         else if (!strcasecmp(end, "m")) {
 421                 *val *= 1024 * 1024;
 422                 return 1;
 423         }
 424         else if (!strcasecmp(end, "g")) {
 425                 *val *= 1024 * 1024 * 1024;
 426                 return 1;
 427         }
 428         return 0;
 429 }
 430
 431 static int git_parse_long(const char *value, long *ret)
 432 {
 433         if (value && *value) {
 434                 char *end;
 435                 intmax_t val;
 436                 uintmax_t uval;
 437                 uintmax_t factor = 1;
 438
 439                 errno = 0;
 440                 val = strtoimax(value, &end, 0);
 441                 if (errno == ERANGE)
 442                         return 0;
 443                 if (!parse_unit_factor(end, &factor))
 444                         return 0;
 445                 uval = abs(val);
 446                 uval *= factor;
 447                 if ((uval > maximum_signed_value_of_type(long)) ||
 448                     (abs(val) > uval))
 449                         return 0;
 450                 val *= factor;
 451                 *ret = val;
 452                 return 1;
 453         }
 454         return 0;
 455 }
 456
 457 int git_parse_ulong(const char *value, unsigned long *ret)
 458 {
 459         if (value && *value) {
 460                 char *end;
 461                 uintmax_t val;
 462                 uintmax_t oldval;
 463
 464                 errno = 0;
 465                 val = strtoumax(value, &end, 0);
 466                 if (errno == ERANGE)
 467                         return 0;
 468                 oldval = val;
 469                 if (!parse_unit_factor(end, &val))
 470                         return 0;
 471                 if ((val > maximum_unsigned_value_of_type(long)) ||
 472                     (oldval > val))
 473                         return 0;
 474                 *ret = val;
 475                 return 1;
 476         }
 477         return 0;
 478 }
 479
 480 static void die_bad_config(const char *name)
 481 {
 482         if (cf && cf->name)
 483                 die("bad config value for '%s' in %s", name, cf->name);
 484         die("bad config value for '%s'", name);
 485 }
 486
 487 int git_config_int(const char *name, const char *value)
 488 {
 489         long ret = 0;
 490         if (!git_parse_long(value, &ret))
 491                 die_bad_config(name);
 492         return ret;
 493 }
 494
 495 unsigned long git_config_ulong(const char *name, const char *value)
 496 {
 497         unsigned long ret;
 498         if (!git_parse_ulong(value, &ret))
 499                 die_bad_config(name);
 500         return ret;
 501 }
 502
 503 static int git_config_maybe_bool_text(const char *name, const char *value)
 504 {
 505         if (!value)
 506                 return 1;
 507         if (!*value)
 508                 return 0;
 509         if (!strcasecmp(value, "true")
 510             || !strcasecmp(value, "yes")
 511             || !strcasecmp(value, "on"))
 512                 return 1;
 513         if (!strcasecmp(value, "false")
 514             || !strcasecmp(value, "no")
 515             || !strcasecmp(value, "off"))
 516                 return 0;
 517         return -1;
 518 }
 519
 520 int git_config_maybe_bool(const char *name, const char *value)
 521 {
 522         long v = git_config_maybe_bool_text(name, value);
 523         if (0 <= v)
 524                 return v;
 525         if (git_parse_long(value, &v))
 526                 return !!v;
 527         return -1;
 528 }
 529
 530 int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 531 {
 532         int v = git_config_maybe_bool_text(name, value);
 533         if (0 <= v) {
 534                 *is_bool = 1;
 535                 return v;
 536         }
 537         *is_bool = 0;
 538         return git_config_int(name, value);
 539 }
 540
 541 int git_config_bool(const char *name, const char *value)
 542 {
 543         int discard;
 544         return !!git_config_bool_or_int(name, value, &discard);
 545 }
 546
 547 int git_config_string(const char **dest, const char *var, const char *value)
 548 {
 549         if (!value)
 550                 return config_error_nonbool(var);
 551         *dest = xstrdup(value);
 552         return 0;
 553 }
 554
 555 int git_config_pathname(const char **dest, const char *var, const char *value)
 556 {
 557         if (!value)
 558                 return config_error_nonbool(var);
 559         *dest = expand_user_path(value);
 560         if (!*dest)
 561                 die("Failed to expand user dir in: '%s'", value);
 562         return 0;
 563 }
 564
 565 static int git_default_core_config(const char *var, const char *value)
 566 {
 567         /* This needs a better name */
 568         if (!strcmp(var, "core.filemode")) {
 569                 trust_executable_bit = git_config_bool(var, value);
 570                 return 0;
 571         }
 572         if (!strcmp(var, "core.trustctime")) {
 573                 trust_ctime = git_config_bool(var, value);
 574                 return 0;
 575         }
 576
 577         if (!strcmp(var, "core.quotepath")) {
 578                 quote_path_fully = git_config_bool(var, value);
 579                 return 0;
 580         }
 581
 582         if (!strcmp(var, "core.symlinks")) {
 583                 has_symlinks = git_config_bool(var, value);
 584                 return 0;
 585         }
 586
 587         if (!strcmp(var, "core.ignorecase")) {
 588                 ignore_case = git_config_bool(var, value);
 589                 return 0;
 590         }
 591
 592         if (!strcmp(var, "core.attributesfile"))
 593                 return git_config_pathname(&git_attributes_file, var, value);
 594
 595         if (!strcmp(var, "core.bare")) {
 596                 is_bare_repository_cfg = git_config_bool(var, value);
 597                 return 0;
 598         }
 599
 600         if (!strcmp(var, "core.ignorestat")) {
 601                 assume_unchanged = git_config_bool(var, value);
 602                 return 0;
 603         }
 604
 605         if (!strcmp(var, "core.prefersymlinkrefs")) {
 606                 prefer_symlink_refs = git_config_bool(var, value);
 607                 return 0;
 608         }
 609
 610         if (!strcmp(var, "core.logallrefupdates")) {
 611                 log_all_ref_updates = git_config_bool(var, value);
 612                 return 0;
 613         }
 614
 615         if (!strcmp(var, "core.warnambiguousrefs")) {
 616                 warn_ambiguous_refs = git_config_bool(var, value);
 617                 return 0;
 618         }
 619
 620         if (!strcmp(var, "core.abbrev")) {
 621                 int abbrev = git_config_int(var, value);
 622                 if (abbrev < minimum_abbrev || abbrev > 40)
 623                         return -1;
 624                 default_abbrev = abbrev;
 625                 return 0;
 626         }
 627
 628         if (!strcmp(var, "core.loosecompression")) {
 629                 int level = git_config_int(var, value);
 630                 if (level == -1)
 631                         level = Z_DEFAULT_COMPRESSION;
 632                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 633                         die("bad zlib compression level %d", level);
 634                 zlib_compression_level = level;
 635                 zlib_compression_seen = 1;
 636                 return 0;
 637         }
 638
 639         if (!strcmp(var, "core.compression")) {
 640                 int level = git_config_int(var, value);
 641                 if (level == -1)
 642                         level = Z_DEFAULT_COMPRESSION;
 643                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 644                         die("bad zlib compression level %d", level);
 645                 core_compression_level = level;
 646                 core_compression_seen = 1;
 647                 if (!zlib_compression_seen)
 648                         zlib_compression_level = level;
 649                 return 0;
 650         }
 651
 652         if (!strcmp(var, "core.packedgitwindowsize")) {
 653                 int pgsz_x2 = getpagesize() * 2;
 654                 packed_git_window_size = git_config_ulong(var, value);
 655
 656                 /* This value must be multiple of (pagesize * 2) */
 657                 packed_git_window_size /= pgsz_x2;
 658                 if (packed_git_window_size < 1)
 659                         packed_git_window_size = 1;
 660                 packed_git_window_size *= pgsz_x2;
 661                 return 0;
 662         }
 663
 664         if (!strcmp(var, "core.bigfilethreshold")) {
 665                 big_file_threshold = git_config_ulong(var, value);
 666                 return 0;
 667         }
 668
 669         if (!strcmp(var, "core.packedgitlimit")) {
 670                 packed_git_limit = git_config_ulong(var, value);
 671                 return 0;
 672         }
 673
 674         if (!strcmp(var, "core.deltabasecachelimit")) {
 675                 delta_base_cache_limit = git_config_ulong(var, value);
 676                 return 0;
 677         }
 678
 679         if (!strcmp(var, "core.logpackaccess"))
 680                 return git_config_string(&log_pack_access, var, value);
 681
 682         if (!strcmp(var, "core.autocrlf")) {
 683                 if (value && !strcasecmp(value, "input")) {
 684                         if (core_eol == EOL_CRLF)
 685                                 return error("core.autocrlf=input conflicts with core.eol=crlf");
 686                         auto_crlf = AUTO_CRLF_INPUT;
 687                         return 0;
 688                 }
 689                 auto_crlf = git_config_bool(var, value);
 690                 return 0;
 691         }
 692
 693         if (!strcmp(var, "core.safecrlf")) {
 694                 if (value && !strcasecmp(value, "warn")) {
 695                         safe_crlf = SAFE_CRLF_WARN;
 696                         return 0;
 697                 }
 698                 safe_crlf = git_config_bool(var, value);
 699                 return 0;
 700         }
 701
 702         if (!strcmp(var, "core.eol")) {
 703                 if (value && !strcasecmp(value, "lf"))
 704                         core_eol = EOL_LF;
 705                 else if (value && !strcasecmp(value, "crlf"))
 706                         core_eol = EOL_CRLF;
 707                 else if (value && !strcasecmp(value, "native"))
 708                         core_eol = EOL_NATIVE;
 709                 else
 710                         core_eol = EOL_UNSET;
 711                 if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 712                         return error("core.autocrlf=input conflicts with core.eol=crlf");
 713                 return 0;
 714         }
 715
 716         if (!strcmp(var, "core.notesref")) {
 717                 notes_ref_name = xstrdup(value);
 718                 return 0;
 719         }
 720
 721         if (!strcmp(var, "core.pager"))
 722                 return git_config_string(&pager_program, var, value);
 723
 724         if (!strcmp(var, "core.editor"))
 725                 return git_config_string(&editor_program, var, value);
 726
 727         if (!strcmp(var, "core.askpass"))
 728                 return git_config_string(&askpass_program, var, value);
 729
 730         if (!strcmp(var, "core.excludesfile"))
 731                 return git_config_pathname(&excludes_file, var, value);
 732
 733         if (!strcmp(var, "core.whitespace")) {
 734                 if (!value)
 735                         return config_error_nonbool(var);
 736                 whitespace_rule_cfg = parse_whitespace_rule(value);
 737                 return 0;
 738         }
 739
 740         if (!strcmp(var, "core.fsyncobjectfiles")) {
 741                 fsync_object_files = git_config_bool(var, value);
 742                 return 0;
 743         }
 744
 745         if (!strcmp(var, "core.preloadindex")) {
 746                 core_preload_index = git_config_bool(var, value);
 747                 return 0;
 748         }
 749
 750         if (!strcmp(var, "core.createobject")) {
 751                 if (!strcmp(value, "rename"))
 752                         object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 753                 else if (!strcmp(value, "link"))
 754                         object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 755                 else
 756                         die("Invalid mode for object creation: %s", value);
 757                 return 0;
 758         }
 759
 760         if (!strcmp(var, "core.sparsecheckout")) {
 761                 core_apply_sparse_checkout = git_config_bool(var, value);
 762                 return 0;
 763         }
 764
 765         /* Add other config variables here and to Documentation/config.txt. */
 766         return 0;
 767 }
 768
 769 static int git_default_user_config(const char *var, const char *value)
 770 {
 771         if (!strcmp(var, "user.name")) {
 772                 if (!value)
 773                         return config_error_nonbool(var);
 774                 strlcpy(git_default_name, value, sizeof(git_default_name));
 775                 user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 776                 return 0;
 777         }
 778
 779         if (!strcmp(var, "user.email")) {
 780                 if (!value)
 781                         return config_error_nonbool(var);
 782                 strlcpy(git_default_email, value, sizeof(git_default_email));
 783                 user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 784                 return 0;
 785         }
 786
 787         /* Add other config variables here and to Documentation/config.txt. */
 788         return 0;
 789 }
 790
 791 static int git_default_i18n_config(const char *var, const char *value)
 792 {
 793         if (!strcmp(var, "i18n.commitencoding"))
 794                 return git_config_string(&git_commit_encoding, var, value);
 795
 796         if (!strcmp(var, "i18n.logoutputencoding"))
 797                 return git_config_string(&git_log_output_encoding, var, value);
 798
 799         /* Add other config variables here and to Documentation/config.txt. */
 800         return 0;
 801 }
 802
 803 static int git_default_branch_config(const char *var, const char *value)
 804 {
 805         if (!strcmp(var, "branch.autosetupmerge")) {
 806                 if (value && !strcasecmp(value, "always")) {
 807                         git_branch_track = BRANCH_TRACK_ALWAYS;
 808                         return 0;
 809                 }
 810                 git_branch_track = git_config_bool(var, value);
 811                 return 0;
 812         }
 813         if (!strcmp(var, "branch.autosetuprebase")) {
 814                 if (!value)
 815                         return config_error_nonbool(var);
 816                 else if (!strcmp(value, "never"))
 817                         autorebase = AUTOREBASE_NEVER;
 818                 else if (!strcmp(value, "local"))
 819                         autorebase = AUTOREBASE_LOCAL;
 820                 else if (!strcmp(value, "remote"))
 821                         autorebase = AUTOREBASE_REMOTE;
 822                 else if (!strcmp(value, "always"))
 823                         autorebase = AUTOREBASE_ALWAYS;
 824                 else
 825                         return error("Malformed value for %s", var);
 826                 return 0;
 827         }
 828
 829         /* Add other config variables here and to Documentation/config.txt. */
 830         return 0;
 831 }
 832
 833 static int git_default_push_config(const char *var, const char *value)
 834 {
 835         if (!strcmp(var, "push.default")) {
 836                 if (!value)
 837                         return config_error_nonbool(var);
 838                 else if (!strcmp(value, "nothing"))
 839                         push_default = PUSH_DEFAULT_NOTHING;
 840                 else if (!strcmp(value, "matching"))
 841                         push_default = PUSH_DEFAULT_MATCHING;
 842                 else if (!strcmp(value, "upstream"))
 843                         push_default = PUSH_DEFAULT_UPSTREAM;
 844                 else if (!strcmp(value, "tracking")) /* deprecated */
 845                         push_default = PUSH_DEFAULT_UPSTREAM;
 846                 else if (!strcmp(value, "current"))
 847                         push_default = PUSH_DEFAULT_CURRENT;
 848                 else {
 849                         error("Malformed value for %s: %s", var, value);
 850                         return error("Must be one of nothing, matching, "
 851                                      "tracking or current.");
 852                 }
 853                 return 0;
 854         }
 855
 856         /* Add other config variables here and to Documentation/config.txt. */
 857         return 0;
 858 }
 859
 860 static int git_default_mailmap_config(const char *var, const char *value)
 861 {
 862         if (!strcmp(var, "mailmap.file"))
 863                 return git_config_string(&git_mailmap_file, var, value);
 864
 865         /* Add other config variables here and to Documentation/config.txt. */
 866         return 0;
 867 }
 868
 869 int git_default_config(const char *var, const char *value, void *dummy)
 870 {
 871         if (!prefixcmp(var, "core."))
 872                 return git_default_core_config(var, value);
 873
 874         if (!prefixcmp(var, "user."))
 875                 return git_default_user_config(var, value);
 876
 877         if (!prefixcmp(var, "i18n."))
 878                 return git_default_i18n_config(var, value);
 879
 880         if (!prefixcmp(var, "branch."))
 881                 return git_default_branch_config(var, value);
 882
 883         if (!prefixcmp(var, "push."))
 884                 return git_default_push_config(var, value);
 885
 886         if (!prefixcmp(var, "mailmap."))
 887                 return git_default_mailmap_config(var, value);
 888
 889         if (!prefixcmp(var, "advice."))
 890                 return git_default_advice_config(var, value);
 891
 892         if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 893                 pager_use_color = git_config_bool(var,value);
 894                 return 0;
 895         }
 896
 897         if (!strcmp(var, "pack.packsizelimit")) {
 898                 pack_size_limit_cfg = git_config_ulong(var, value);
 899                 return 0;
 900         }
 901         /* Add other config variables here and to Documentation/config.txt. */
 902         return 0;
 903 }
 904
 905 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 906 {
 907         int ret;
 908         FILE *f = fopen(filename, "r");
 909
 910         ret = -1;
 911         if (f) {
 912                 config_file top;
 913
 914                 /* push config-file parsing state stack */
 915                 top.prev = cf;
 916                 top.f = f;
 917                 top.name = filename;
 918                 top.linenr = 1;
 919                 top.eof = 0;
 920                 strbuf_init(&top.value, 1024);
 921                 cf = &top;
 922
 923                 ret = git_parse_file(fn, data);
 924
 925                 /* pop config-file parsing state stack */
 926                 strbuf_release(&top.value);
 927                 cf = top.prev;
 928
 929                 fclose(f);
 930         }
 931         return ret;
 932 }
 933
 934 const char *git_etc_gitconfig(void)
 935 {
 936         static const char *system_wide;
 937         if (!system_wide)
 938                 system_wide = system_path(ETC_GITCONFIG);
 939         return system_wide;
 940 }
 941
 942 int git_env_bool(const char *k, int def)
 943 {
 944         const char *v = getenv(k);
 945         return v ? git_config_bool(k, v) : def;
 946 }
 947
 948 int git_config_system(void)
 949 {
 950         return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 951 }
 952
 953 int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 954 {
 955         int ret = 0, found = 0;
 956         const char *home = NULL;
 957
 958         if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 959                 ret += git_config_from_file(fn, git_etc_gitconfig(),
 960                                             data);
 961                 found += 1;
 962         }
 963
 964         home = getenv("HOME");
 965         if (home) {
 966                 char buf[PATH_MAX];
 967                 char *user_config = mksnpath(buf, sizeof(buf), "%s/.gitconfig", home);
 968                 if (!access(user_config, R_OK)) {
 969                         ret += git_config_from_file(fn, user_config, data);
 970                         found += 1;
 971                 }
 972         }
 973
 974         if (repo_config && !access(repo_config, R_OK)) {
 975                 ret += git_config_from_file(fn, repo_config, data);
 976                 found += 1;
 977         }
 978
 979         switch (git_config_from_parameters(fn, data)) {
 980         case -1: /* error */
 981                 die("unable to parse command-line config");
 982                 break;
 983         case 0: /* found nothing */
 984                 break;
 985         default: /* found at least one item */
 986                 found++;
 987                 break;
 988         }
 989
 990         return ret == 0 ? found : ret;
 991 }
 992
 993 int git_config_with_options(config_fn_t fn, void *data,
 994                             const char *filename, int respect_includes)
 995 {
 996         char *repo_config = NULL;
 997         int ret;
 998         struct config_include_data inc = CONFIG_INCLUDE_INIT;
 999
1000         if (respect_includes) {
1001                 inc.fn = fn;
1002                 inc.data = data;
1003                 fn = git_config_include;
1004                 data = &inc;
1005         }
1006
1007         /*
1008          * If we have a specific filename, use it. Otherwise, follow the
1009          * regular lookup sequence.
1010          */
1011         if (filename)
1012                 return git_config_from_file(fn, filename, data);
1013
1014         repo_config = git_pathdup("config");
1015         ret = git_config_early(fn, data, repo_config);
1016         if (repo_config)
1017                 free(repo_config);
1018         return ret;
1019 }
1020
1021 int git_config(config_fn_t fn, void *data)
1022 {
1023         return git_config_with_options(fn, data, NULL, 1);
1024 }
1025
1026 /*
1027  * Find all the stuff for git_config_set() below.
1028  */
1029
1030 #define MAX_MATCHES 512
1031
1032 static struct {
1033         int baselen;
1034         char *key;
1035         int do_not_match;
1036         regex_t *value_regex;
1037         int multi_replace;
1038         size_t offset[MAX_MATCHES];
1039         enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1040         int seen;
1041 } store;
1042
1043 static int matches(const char *key, const char *value)
1044 {
1045         return !strcmp(key, store.key) &&
1046                 (store.value_regex == NULL ||
1047                  (store.do_not_match ^
1048                   !regexec(store.value_regex, value, 0, NULL, 0)));
1049 }
1050
1051 static int store_aux(const char *key, const char *value, void *cb)
1052 {
1053         const char *ep;
1054         size_t section_len;
1055         FILE *f = cf->f;
1056
1057         switch (store.state) {
1058         case KEY_SEEN:
1059                 if (matches(key, value)) {
1060                         if (store.seen == 1 && store.multi_replace == 0) {
1061                                 warning("%s has multiple values", key);
1062                         } else if (store.seen >= MAX_MATCHES) {
1063                                 error("too many matches for %s", key);
1064                                 return 1;
1065                         }
1066
1067                         store.offset[store.seen] = ftell(f);
1068                         store.seen++;
1069                 }
1070                 break;
1071         case SECTION_SEEN:
1072                 /*
1073                  * What we are looking for is in store.key (both
1074                  * section and var), and its section part is baselen
1075                  * long.  We found key (again, both section and var).
1076                  * We would want to know if this key is in the same
1077                  * section as what we are looking for.  We already
1078                  * know we are in the same section as what should
1079                  * hold store.key.
1080                  */
1081                 ep = strrchr(key, '.');
1082                 section_len = ep - key;
1083
1084                 if ((section_len != store.baselen) ||
1085                     memcmp(key, store.key, section_len+1)) {
1086                         store.state = SECTION_END_SEEN;
1087                         break;
1088                 }
1089
1090                 /*
1091                  * Do not increment matches: this is no match, but we
1092                  * just made sure we are in the desired section.
1093                  */
1094                 store.offset[store.seen] = ftell(f);
1095                 /* fallthru */
1096         case SECTION_END_SEEN:
1097         case START:
1098                 if (matches(key, value)) {
1099                         store.offset[store.seen] = ftell(f);
1100                         store.state = KEY_SEEN;
1101                         store.seen++;
1102                 } else {
1103                         if (strrchr(key, '.') - key == store.baselen &&
1104                               !strncmp(key, store.key, store.baselen)) {
1105                                         store.state = SECTION_SEEN;
1106                                         store.offset[store.seen] = ftell(f);
1107                         }
1108                 }
1109         }
1110         return 0;
1111 }
1112
1113 static int write_error(const char *filename)
1114 {
1115         error("failed to write new configuration file %s", filename);
1116
1117         /* Same error code as "failed to rename". */
1118         return 4;
1119 }
1120
1121 static int store_write_section(int fd, const char *key)
1122 {
1123         const char *dot;
1124         int i, success;
1125         struct strbuf sb = STRBUF_INIT;
1126
1127         dot = memchr(key, '.', store.baselen);
1128         if (dot) {
1129                 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1130                 for (i = dot - key + 1; i < store.baselen; i++) {
1131                         if (key[i] == '"' || key[i] == '\\')
1132                                 strbuf_addch(&sb, '\\');
1133                         strbuf_addch(&sb, key[i]);
1134                 }
1135                 strbuf_addstr(&sb, "\"]\n");
1136         } else {
1137                 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1138         }
1139
1140         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1141         strbuf_release(&sb);
1142
1143         return success;
1144 }
1145
1146 static int store_write_pair(int fd, const char *key, const char *value)
1147 {
1148         int i, success;
1149         int length = strlen(key + store.baselen + 1);
1150         const char *quote = "";
1151         struct strbuf sb = STRBUF_INIT;
1152
1153         /*
1154          * Check to see if the value needs to be surrounded with a dq pair.
1155          * Note that problematic characters are always backslash-quoted; this
1156          * check is about not losing leading or trailing SP and strings that
1157          * follow beginning-of-comment characters (i.e. ';' and '#') by the
1158          * configuration parser.
1159          */
1160         if (value[0] == ' ')
1161                 quote = "\"";
1162         for (i = 0; value[i]; i++)
1163                 if (value[i] == ';' || value[i] == '#')
1164                         quote = "\"";
1165         if (i && value[i - 1] == ' ')
1166                 quote = "\"";
1167
1168         strbuf_addf(&sb, "\t%.*s = %s",
1169                     length, key + store.baselen + 1, quote);
1170
1171         for (i = 0; value[i]; i++)
1172                 switch (value[i]) {
1173                 case '\n':
1174                         strbuf_addstr(&sb, "\\n");
1175                         break;
1176                 case '\t':
1177                         strbuf_addstr(&sb, "\\t");
1178                         break;
1179                 case '"':
1180                 case '\\':
1181                         strbuf_addch(&sb, '\\');
1182                 default:
1183                         strbuf_addch(&sb, value[i]);
1184                         break;
1185                 }
1186         strbuf_addf(&sb, "%s\n", quote);
1187
1188         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1189         strbuf_release(&sb);
1190
1191         return success;
1192 }
1193
1194 static ssize_t find_beginning_of_line(const char *contents, size_t size,
1195         size_t offset_, int *found_bracket)
1196 {
1197         size_t equal_offset = size, bracket_offset = size;
1198         ssize_t offset;
1199
1200 contline:
1201         for (offset = offset_-2; offset > 0
1202                         && contents[offset] != '\n'; offset--)
1203                 switch (contents[offset]) {
1204                         case '=': equal_offset = offset; break;
1205                         case ']': bracket_offset = offset; break;
1206                 }
1207         if (offset > 0 && contents[offset-1] == '\\') {
1208                 offset_ = offset;
1209                 goto contline;
1210         }
1211         if (bracket_offset < equal_offset) {
1212                 *found_bracket = 1;
1213                 offset = bracket_offset+1;
1214         } else
1215                 offset++;
1216
1217         return offset;
1218 }
1219
1220 int git_config_set_in_file(const char *config_filename,
1221                         const char *key, const char *value)
1222 {
1223         return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1224 }
1225
1226 int git_config_set(const char *key, const char *value)
1227 {
1228         return git_config_set_multivar(key, value, NULL, 0);
1229 }
1230
1231 /*
1232  * Auxiliary function to sanity-check and split the key into the section
1233  * identifier and variable name.
1234  *
1235  * Returns 0 on success, -1 when there is an invalid character in the key and
1236  * -2 if there is no section name in the key.
1237  *
1238  * store_key - pointer to char* which will hold a copy of the key with
1239  *             lowercase section and variable name
1240  * baselen - pointer to int which will hold the length of the
1241  *           section + subsection part, can be NULL
1242  */
1243 int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1244 {
1245         int i, dot, baselen;
1246         const char *last_dot = strrchr(key, '.');
1247
1248         /*
1249          * Since "key" actually contains the section name and the real
1250          * key name separated by a dot, we have to know where the dot is.
1251          */
1252
1253         if (last_dot == NULL || last_dot == key) {
1254                 error("key does not contain a section: %s", key);
1255                 return -CONFIG_NO_SECTION_OR_NAME;
1256         }
1257
1258         if (!last_dot[1]) {
1259                 error("key does not contain variable name: %s", key);
1260                 return -CONFIG_NO_SECTION_OR_NAME;
1261         }
1262
1263         baselen = last_dot - key;
1264         if (baselen_)
1265                 *baselen_ = baselen;
1266
1267         /*
1268          * Validate the key and while at it, lower case it for matching.
1269          */
1270         *store_key = xmalloc(strlen(key) + 1);
1271
1272         dot = 0;
1273         for (i = 0; key[i]; i++) {
1274                 unsigned char c = key[i];
1275                 if (c == '.')
1276                         dot = 1;
1277                 /* Leave the extended basename untouched.. */
1278                 if (!dot || i > baselen) {
1279                         if (!iskeychar(c) ||
1280                             (i == baselen + 1 && !isalpha(c))) {
1281                                 error("invalid key: %s", key);
1282                                 goto out_free_ret_1;
1283                         }
1284                         c = tolower(c);
1285                 } else if (c == '\n') {
1286                         error("invalid key (newline): %s", key);
1287                         goto out_free_ret_1;
1288                 }
1289                 (*store_key)[i] = c;
1290         }
1291         (*store_key)[i] = 0;
1292
1293         return 0;
1294
1295 out_free_ret_1:
1296         free(*store_key);
1297         return -CONFIG_INVALID_KEY;
1298 }
1299
1300 /*
1301  * If value==NULL, unset in (remove from) config,
1302  * if value_regex!=NULL, disregard key/value pairs where value does not match.
1303  * if multi_replace==0, nothing, or only one matching key/value is replaced,
1304  *     else all matching key/values (regardless how many) are removed,
1305  *     before the new pair is written.
1306  *
1307  * Returns 0 on success.
1308  *
1309  * This function does this:
1310  *
1311  * - it locks the config file by creating ".git/config.lock"
1312  *
1313  * - it then parses the config using store_aux() as validator to find
1314  *   the position on the key/value pair to replace. If it is to be unset,
1315  *   it must be found exactly once.
1316  *
1317  * - the config file is mmap()ed and the part before the match (if any) is
1318  *   written to the lock file, then the changed part and the rest.
1319  *
1320  * - the config file is removed and the lock file rename()d to it.
1321  *
1322  */
1323 int git_config_set_multivar_in_file(const char *config_filename,
1324                                 const char *key, const char *value,
1325                                 const char *value_regex, int multi_replace)
1326 {
1327         int fd = -1, in_fd;
1328         int ret;
1329         struct lock_file *lock = NULL;
1330         char *filename_buf = NULL;
1331
1332         /* parse-key returns negative; flip the sign to feed exit(3) */
1333         ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1334         if (ret)
1335                 goto out_free;
1336
1337         store.multi_replace = multi_replace;
1338
1339         if (!config_filename)
1340                 config_filename = filename_buf = git_pathdup("config");
1341
1342         /*
1343          * The lock serves a purpose in addition to locking: the new
1344          * contents of .git/config will be written into it.
1345          */
1346         lock = xcalloc(sizeof(struct lock_file), 1);
1347         fd = hold_lock_file_for_update(lock, config_filename, 0);
1348         if (fd < 0) {
1349                 error("could not lock config file %s: %s", config_filename, strerror(errno));
1350                 free(store.key);
1351                 ret = CONFIG_NO_LOCK;
1352                 goto out_free;
1353         }
1354
1355         /*
1356          * If .git/config does not exist yet, write a minimal version.
1357          */
1358         in_fd = open(config_filename, O_RDONLY);
1359         if ( in_fd < 0 ) {
1360                 free(store.key);
1361
1362                 if ( ENOENT != errno ) {
1363                         error("opening %s: %s", config_filename,
1364                               strerror(errno));
1365                         ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1366                         goto out_free;
1367                 }
1368                 /* if nothing to unset, error out */
1369                 if (value == NULL) {
1370                         ret = CONFIG_NOTHING_SET;
1371                         goto out_free;
1372                 }
1373
1374                 store.key = (char *)key;
1375                 if (!store_write_section(fd, key) ||
1376                     !store_write_pair(fd, key, value))
1377                         goto write_err_out;
1378         } else {
1379                 struct stat st;
1380                 char *contents;
1381                 size_t contents_sz, copy_begin, copy_end;
1382                 int i, new_line = 0;
1383
1384                 if (value_regex == NULL)
1385                         store.value_regex = NULL;
1386                 else {
1387                         if (value_regex[0] == '!') {
1388                                 store.do_not_match = 1;
1389                                 value_regex++;
1390                         } else
1391                                 store.do_not_match = 0;
1392
1393                         store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1394                         if (regcomp(store.value_regex, value_regex,
1395                                         REG_EXTENDED)) {
1396                                 error("invalid pattern: %s", value_regex);
1397                                 free(store.value_regex);
1398                                 ret = CONFIG_INVALID_PATTERN;
1399                                 goto out_free;
1400                         }
1401                 }
1402
1403                 store.offset[0] = 0;
1404                 store.state = START;
1405                 store.seen = 0;
1406
1407                 /*
1408                  * After this, store.offset will contain the *end* offset
1409                  * of the last match, or remain at 0 if no match was found.
1410                  * As a side effect, we make sure to transform only a valid
1411                  * existing config file.
1412                  */
1413                 if (git_config_from_file(store_aux, config_filename, NULL)) {
1414                         error("invalid config file %s", config_filename);
1415                         free(store.key);
1416                         if (store.value_regex != NULL) {
1417                                 regfree(store.value_regex);
1418                                 free(store.value_regex);
1419                         }
1420                         ret = CONFIG_INVALID_FILE;
1421                         goto out_free;
1422                 }
1423
1424                 free(store.key);
1425                 if (store.value_regex != NULL) {
1426                         regfree(store.value_regex);
1427                         free(store.value_regex);
1428                 }
1429
1430                 /* if nothing to unset, or too many matches, error out */
1431                 if ((store.seen == 0 && value == NULL) ||
1432                                 (store.seen > 1 && multi_replace == 0)) {
1433                         ret = CONFIG_NOTHING_SET;
1434                         goto out_free;
1435                 }
1436
1437                 fstat(in_fd, &st);
1438                 contents_sz = xsize_t(st.st_size);
1439                 contents = xmmap(NULL, contents_sz, PROT_READ,
1440                         MAP_PRIVATE, in_fd, 0);
1441                 close(in_fd);
1442
1443                 if (store.seen == 0)
1444                         store.seen = 1;
1445
1446                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1447                         if (store.offset[i] == 0) {
1448                                 store.offset[i] = copy_end = contents_sz;
1449                         } else if (store.state != KEY_SEEN) {
1450                                 copy_end = store.offset[i];
1451                         } else
1452                                 copy_end = find_beginning_of_line(
1453                                         contents, contents_sz,
1454                                         store.offset[i]-2, &new_line);
1455
1456                         if (copy_end > 0 && contents[copy_end-1] != '\n')
1457                                 new_line = 1;
1458
1459                         /* write the first part of the config */
1460                         if (copy_end > copy_begin) {
1461                                 if (write_in_full(fd, contents + copy_begin,
1462                                                   copy_end - copy_begin) <
1463                                     copy_end - copy_begin)
1464                                         goto write_err_out;
1465                                 if (new_line &&
1466                                     write_str_in_full(fd, "\n") != 1)
1467                                         goto write_err_out;
1468                         }
1469                         copy_begin = store.offset[i];
1470                 }
1471
1472                 /* write the pair (value == NULL means unset) */
1473                 if (value != NULL) {
1474                         if (store.state == START) {
1475                                 if (!store_write_section(fd, key))
1476                                         goto write_err_out;
1477                         }
1478                         if (!store_write_pair(fd, key, value))
1479                                 goto write_err_out;
1480                 }
1481
1482                 /* write the rest of the config */
1483                 if (copy_begin < contents_sz)
1484                         if (write_in_full(fd, contents + copy_begin,
1485                                           contents_sz - copy_begin) <
1486                             contents_sz - copy_begin)
1487                                 goto write_err_out;
1488
1489                 munmap(contents, contents_sz);
1490         }
1491
1492         if (commit_lock_file(lock) < 0) {
1493                 error("could not commit config file %s", config_filename);
1494                 ret = CONFIG_NO_WRITE;
1495                 goto out_free;
1496         }
1497
1498         /*
1499          * lock is committed, so don't try to roll it back below.
1500          * NOTE: Since lockfile.c keeps a linked list of all created
1501          * lock_file structures, it isn't safe to free(lock).  It's
1502          * better to just leave it hanging around.
1503          */
1504         lock = NULL;
1505         ret = 0;
1506
1507 out_free:
1508         if (lock)
1509                 rollback_lock_file(lock);
1510         free(filename_buf);
1511         return ret;
1512
1513 write_err_out:
1514         ret = write_error(lock->filename);
1515         goto out_free;
1516
1517 }
1518
1519 int git_config_set_multivar(const char *key, const char *value,
1520                         const char *value_regex, int multi_replace)
1521 {
1522         return git_config_set_multivar_in_file(NULL, key, value, value_regex,
1523                                                multi_replace);
1524 }
1525
1526 static int section_name_match (const char *buf, const char *name)
1527 {
1528         int i = 0, j = 0, dot = 0;
1529         if (buf[i] != '[')
1530                 return 0;
1531         for (i = 1; buf[i] && buf[i] != ']'; i++) {
1532                 if (!dot && isspace(buf[i])) {
1533                         dot = 1;
1534                         if (name[j++] != '.')
1535                                 break;
1536                         for (i++; isspace(buf[i]); i++)
1537                                 ; /* do nothing */
1538                         if (buf[i] != '"')
1539                                 break;
1540                         continue;
1541                 }
1542                 if (buf[i] == '\\' && dot)
1543                         i++;
1544                 else if (buf[i] == '"' && dot) {
1545                         for (i++; isspace(buf[i]); i++)
1546                                 ; /* do_nothing */
1547                         break;
1548                 }
1549                 if (buf[i] != name[j++])
1550                         break;
1551         }
1552         if (buf[i] == ']' && name[j] == 0) {
1553                 /*
1554                  * We match, now just find the right length offset by
1555                  * gobbling up any whitespace after it, as well
1556                  */
1557                 i++;
1558                 for (; buf[i] && isspace(buf[i]); i++)
1559                         ; /* do nothing */
1560                 return i;
1561         }
1562         return 0;
1563 }
1564
1565 /* if new_name == NULL, the section is removed instead */
1566 int git_config_rename_section_in_file(const char *config_filename,
1567                                       const char *old_name, const char *new_name)
1568 {
1569         int ret = 0, remove = 0;
1570         char *filename_buf = NULL;
1571         struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1572         int out_fd;
1573         char buf[1024];
1574         FILE *config_file;
1575
1576         if (!config_filename)
1577                 config_filename = filename_buf = git_pathdup("config");
1578
1579         out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1580         if (out_fd < 0) {
1581                 ret = error("could not lock config file %s", config_filename);
1582                 goto out;
1583         }
1584
1585         if (!(config_file = fopen(config_filename, "rb"))) {
1586                 /* no config file means nothing to rename, no error */
1587                 goto unlock_and_out;
1588         }
1589
1590         while (fgets(buf, sizeof(buf), config_file)) {
1591                 int i;
1592                 int length;
1593                 char *output = buf;
1594                 for (i = 0; buf[i] && isspace(buf[i]); i++)
1595                         ; /* do nothing */
1596                 if (buf[i] == '[') {
1597                         /* it's a section */
1598                         int offset = section_name_match(&buf[i], old_name);
1599                         if (offset > 0) {
1600                                 ret++;
1601                                 if (new_name == NULL) {
1602                                         remove = 1;
1603                                         continue;
1604                                 }
1605                                 store.baselen = strlen(new_name);
1606                                 if (!store_write_section(out_fd, new_name)) {
1607                                         ret = write_error(lock->filename);
1608                                         goto out;
1609                                 }
1610                                 /*
1611                                  * We wrote out the new section, with
1612                                  * a newline, now skip the old
1613                                  * section's length
1614                                  */
1615                                 output += offset + i;
1616                                 if (strlen(output) > 0) {
1617                                         /*
1618                                          * More content means there's
1619                                          * a declaration to put on the
1620                                          * next line; indent with a
1621                                          * tab
1622                                          */
1623                                         output -= 1;
1624                                         output[0] = '\t';
1625                                 }
1626                         }
1627                         remove = 0;
1628                 }
1629                 if (remove)
1630                         continue;
1631                 length = strlen(output);
1632                 if (write_in_full(out_fd, output, length) != length) {
1633                         ret = write_error(lock->filename);
1634                         goto out;
1635                 }
1636         }
1637         fclose(config_file);
1638 unlock_and_out:
1639         if (commit_lock_file(lock) < 0)
1640                 ret = error("could not commit config file %s", config_filename);
1641 out:
1642         free(filename_buf);
1643         return ret;
1644 }
1645
1646 int git_config_rename_section(const char *old_name, const char *new_name)
1647 {
1648         return git_config_rename_section_in_file(NULL, old_name, new_name);
1649 }
1650
1651 /*
1652  * Call this to report error for your variable that should not
1653  * get a boolean value (i.e. "[my] var" means "true").
1654  */
1655 int config_error_nonbool(const char *var)
1656 {
1657         return error("Missing value for '%s'", var);
1658 }