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