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