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 #include "hashmap.h"
  13 #include "string-list.h"
  14
  15 struct config_source {
  16         struct config_source *prev;
  17         union {
  18                 FILE *file;
  19                 struct config_buf {
  20                         const char *buf;
  21                         size_t len;
  22                         size_t pos;
  23                 } buf;
  24         } u;
  25         const char *name;
  26         const char *path;
  27         int die_on_error;
  28         int linenr;
  29         int eof;
  30         struct strbuf value;
  31         struct strbuf var;
  32
  33         int (*do_fgetc)(struct config_source *c);
  34         int (*do_ungetc)(int c, struct config_source *conf);
  35         long (*do_ftell)(struct config_source *c);
  36 };
  37
  38 static struct config_source *cf;
  39
  40 static int zlib_compression_seen;
  41
  42 /*
  43  * Default config_set that contains key-value pairs from the usual set of config
  44  * config files (i.e repo specific .git/config, user wide ~/.gitconfig, XDG
  45  * config file and the global /etc/gitconfig)
  46  */
  47 static struct config_set the_config_set;
  48
  49 static int config_file_fgetc(struct config_source *conf)
  50 {
  51         return fgetc(conf->u.file);
  52 }
  53
  54 static int config_file_ungetc(int c, struct config_source *conf)
  55 {
  56         return ungetc(c, conf->u.file);
  57 }
  58
  59 static long config_file_ftell(struct config_source *conf)
  60 {
  61         return ftell(conf->u.file);
  62 }
  63
  64
  65 static int config_buf_fgetc(struct config_source *conf)
  66 {
  67         if (conf->u.buf.pos < conf->u.buf.len)
  68                 return conf->u.buf.buf[conf->u.buf.pos++];
  69
  70         return EOF;
  71 }
  72
  73 static int config_buf_ungetc(int c, struct config_source *conf)
  74 {
  75         if (conf->u.buf.pos > 0)
  76                 return conf->u.buf.buf[--conf->u.buf.pos];
  77
  78         return EOF;
  79 }
  80
  81 static long config_buf_ftell(struct config_source *conf)
  82 {
  83         return conf->u.buf.pos;
  84 }
  85
  86 #define MAX_INCLUDE_DEPTH 10
  87 static const char include_depth_advice[] =
  88 "exceeded maximum include depth (%d) while including\n"
  89 "       %s\n"
  90 "from\n"
  91 "       %s\n"
  92 "Do you have circular includes?";
  93 static int handle_path_include(const char *path, struct config_include_data *inc)
  94 {
  95         int ret = 0;
  96         struct strbuf buf = STRBUF_INIT;
  97         char *expanded;
  98
  99         if (!path)
 100                 return config_error_nonbool("include.path");
 101
 102         expanded = expand_user_path(path);
 103         if (!expanded)
 104                 return error("Could not expand include path '%s'", path);
 105         path = expanded;
 106
 107         /*
 108          * Use an absolute path as-is, but interpret relative paths
 109          * based on the including config file.
 110          */
 111         if (!is_absolute_path(path)) {
 112                 char *slash;
 113
 114                 if (!cf || !cf->path)
 115                         return error("relative config includes must come from files");
 116
 117                 slash = find_last_dir_sep(cf->path);
 118                 if (slash)
 119                         strbuf_add(&buf, cf->path, slash - cf->path + 1);
 120                 strbuf_addstr(&buf, path);
 121                 path = buf.buf;
 122         }
 123
 124         if (!access_or_die(path, R_OK, 0)) {
 125                 if (++inc->depth > MAX_INCLUDE_DEPTH)
 126                         die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
 127                             cf && cf->name ? cf->name : "the command line");
 128                 ret = git_config_from_file(git_config_include, path, inc);
 129                 inc->depth--;
 130         }
 131         strbuf_release(&buf);
 132         free(expanded);
 133         return ret;
 134 }
 135
 136 int git_config_include(const char *var, const char *value, void *data)
 137 {
 138         struct config_include_data *inc = data;
 139         int ret;
 140
 141         /*
 142          * Pass along all values, including "include" directives; this makes it
 143          * possible to query information on the includes themselves.
 144          */
 145         ret = inc->fn(var, value, inc->data);
 146         if (ret < 0)
 147                 return ret;
 148
 149         if (!strcmp(var, "include.path"))
 150                 ret = handle_path_include(value, inc);
 151         return ret;
 152 }
 153
 154 void git_config_push_parameter(const char *text)
 155 {
 156         struct strbuf env = STRBUF_INIT;
 157         const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
 158         if (old) {
 159                 strbuf_addstr(&env, old);
 160                 strbuf_addch(&env, ' ');
 161         }
 162         sq_quote_buf(&env, text);
 163         setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
 164         strbuf_release(&env);
 165 }
 166
 167 int git_config_parse_parameter(const char *text,
 168                                config_fn_t fn, void *data)
 169 {
 170         const char *value;
 171         struct strbuf **pair;
 172
 173         pair = strbuf_split_str(text, '=', 2);
 174         if (!pair[0])
 175                 return error("bogus config parameter: %s", text);
 176
 177         if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=') {
 178                 strbuf_setlen(pair[0], pair[0]->len - 1);
 179                 value = pair[1] ? pair[1]->buf : "";
 180         } else {
 181                 value = NULL;
 182         }
 183
 184         strbuf_trim(pair[0]);
 185         if (!pair[0]->len) {
 186                 strbuf_list_free(pair);
 187                 return error("bogus config parameter: %s", text);
 188         }
 189         strbuf_tolower(pair[0]);
 190         if (fn(pair[0]->buf, value, data) < 0) {
 191                 strbuf_list_free(pair);
 192                 return -1;
 193         }
 194         strbuf_list_free(pair);
 195         return 0;
 196 }
 197
 198 int git_config_from_parameters(config_fn_t fn, void *data)
 199 {
 200         const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 201         char *envw;
 202         const char **argv = NULL;
 203         int nr = 0, alloc = 0;
 204         int i;
 205
 206         if (!env)
 207                 return 0;
 208         /* sq_dequote will write over it */
 209         envw = xstrdup(env);
 210
 211         if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 212                 free(envw);
 213                 return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
 214         }
 215
 216         for (i = 0; i < nr; i++) {
 217                 if (git_config_parse_parameter(argv[i], fn, data) < 0) {
 218                         free(argv);
 219                         free(envw);
 220                         return -1;
 221                 }
 222         }
 223
 224         free(argv);
 225         free(envw);
 226         return nr > 0;
 227 }
 228
 229 static int get_next_char(void)
 230 {
 231         int c = cf->do_fgetc(cf);
 232
 233         if (c == '\r') {
 234                 /* DOS like systems */
 235                 c = cf->do_fgetc(cf);
 236                 if (c != '\n') {
 237                         cf->do_ungetc(c, cf);
 238                         c = '\r';
 239                 }
 240         }
 241         if (c == '\n')
 242                 cf->linenr++;
 243         if (c == EOF) {
 244                 cf->eof = 1;
 245                 cf->linenr++;
 246                 c = '\n';
 247         }
 248         return c;
 249 }
 250
 251 static char *parse_value(void)
 252 {
 253         int quote = 0, comment = 0, space = 0;
 254
 255         strbuf_reset(&cf->value);
 256         for (;;) {
 257                 int c = get_next_char();
 258                 if (c == '\n') {
 259                         if (quote) {
 260                                 cf->linenr--;
 261                                 return NULL;
 262                         }
 263                         return cf->value.buf;
 264                 }
 265                 if (comment)
 266                         continue;
 267                 if (isspace(c) && !quote) {
 268                         if (cf->value.len)
 269                                 space++;
 270                         continue;
 271                 }
 272                 if (!quote) {
 273                         if (c == ';' || c == '#') {
 274                                 comment = 1;
 275                                 continue;
 276                         }
 277                 }
 278                 for (; space; space--)
 279                         strbuf_addch(&cf->value, ' ');
 280                 if (c == '\\') {
 281                         c = get_next_char();
 282                         switch (c) {
 283                         case '\n':
 284                                 continue;
 285                         case 't':
 286                                 c = '\t';
 287                                 break;
 288                         case 'b':
 289                                 c = '\b';
 290                                 break;
 291                         case 'n':
 292                                 c = '\n';
 293                                 break;
 294                         /* Some characters escape as themselves */
 295                         case '\\': case '"':
 296                                 break;
 297                         /* Reject unknown escape sequences */
 298                         default:
 299                                 return NULL;
 300                         }
 301                         strbuf_addch(&cf->value, c);
 302                         continue;
 303                 }
 304                 if (c == '"') {
 305                         quote = 1-quote;
 306                         continue;
 307                 }
 308                 strbuf_addch(&cf->value, c);
 309         }
 310 }
 311
 312 static inline int iskeychar(int c)
 313 {
 314         return isalnum(c) || c == '-';
 315 }
 316
 317 static int get_value(config_fn_t fn, void *data, struct strbuf *name)
 318 {
 319         int c;
 320         char *value;
 321         int ret;
 322
 323         /* Get the full name */
 324         for (;;) {
 325                 c = get_next_char();
 326                 if (cf->eof)
 327                         break;
 328                 if (!iskeychar(c))
 329                         break;
 330                 strbuf_addch(name, tolower(c));
 331         }
 332
 333         while (c == ' ' || c == '\t')
 334                 c = get_next_char();
 335
 336         value = NULL;
 337         if (c != '\n') {
 338                 if (c != '=')
 339                         return -1;
 340                 value = parse_value();
 341                 if (!value)
 342                         return -1;
 343         }
 344         /*
 345          * We already consumed the \n, but we need linenr to point to
 346          * the line we just parsed during the call to fn to get
 347          * accurate line number in error messages.
 348          */
 349         cf->linenr--;
 350         ret = fn(name->buf, value, data);
 351         cf->linenr++;
 352         return ret;
 353 }
 354
 355 static int get_extended_base_var(struct strbuf *name, int c)
 356 {
 357         do {
 358                 if (c == '\n')
 359                         goto error_incomplete_line;
 360                 c = get_next_char();
 361         } while (isspace(c));
 362
 363         /* We require the format to be '[base "extension"]' */
 364         if (c != '"')
 365                 return -1;
 366         strbuf_addch(name, '.');
 367
 368         for (;;) {
 369                 int c = get_next_char();
 370                 if (c == '\n')
 371                         goto error_incomplete_line;
 372                 if (c == '"')
 373                         break;
 374                 if (c == '\\') {
 375                         c = get_next_char();
 376                         if (c == '\n')
 377                                 goto error_incomplete_line;
 378                 }
 379                 strbuf_addch(name, c);
 380         }
 381
 382         /* Final ']' */
 383         if (get_next_char() != ']')
 384                 return -1;
 385         return 0;
 386 error_incomplete_line:
 387         cf->linenr--;
 388         return -1;
 389 }
 390
 391 static int get_base_var(struct strbuf *name)
 392 {
 393         for (;;) {
 394                 int c = get_next_char();
 395                 if (cf->eof)
 396                         return -1;
 397                 if (c == ']')
 398                         return 0;
 399                 if (isspace(c))
 400                         return get_extended_base_var(name, c);
 401                 if (!iskeychar(c) && c != '.')
 402                         return -1;
 403                 strbuf_addch(name, tolower(c));
 404         }
 405 }
 406
 407 static int git_parse_source(config_fn_t fn, void *data)
 408 {
 409         int comment = 0;
 410         int baselen = 0;
 411         struct strbuf *var = &cf->var;
 412
 413         /* U+FEFF Byte Order Mark in UTF8 */
 414         static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 415         const unsigned char *bomptr = utf8_bom;
 416
 417         for (;;) {
 418                 int c = get_next_char();
 419                 if (bomptr && *bomptr) {
 420                         /* We are at the file beginning; skip UTF8-encoded BOM
 421                          * if present. Sane editors won't put this in on their
 422                          * own, but e.g. Windows Notepad will do it happily. */
 423                         if ((unsigned char) c == *bomptr) {
 424                                 bomptr++;
 425                                 continue;
 426                         } else {
 427                                 /* Do not tolerate partial BOM. */
 428                                 if (bomptr != utf8_bom)
 429                                         break;
 430                                 /* No BOM at file beginning. Cool. */
 431                                 bomptr = NULL;
 432                         }
 433                 }
 434                 if (c == '\n') {
 435                         if (cf->eof)
 436                                 return 0;
 437                         comment = 0;
 438                         continue;
 439                 }
 440                 if (comment || isspace(c))
 441                         continue;
 442                 if (c == '#' || c == ';') {
 443                         comment = 1;
 444                         continue;
 445                 }
 446                 if (c == '[') {
 447                         /* Reset prior to determining a new stem */
 448                         strbuf_reset(var);
 449                         if (get_base_var(var) < 0 || var->len < 1)
 450                                 break;
 451                         strbuf_addch(var, '.');
 452                         baselen = var->len;
 453                         continue;
 454                 }
 455                 if (!isalpha(c))
 456                         break;
 457                 /*
 458                  * Truncate the var name back to the section header
 459                  * stem prior to grabbing the suffix part of the name
 460                  * and the value.
 461                  */
 462                 strbuf_setlen(var, baselen);
 463                 strbuf_addch(var, tolower(c));
 464                 if (get_value(fn, data, var) < 0)
 465                         break;
 466         }
 467         if (cf->die_on_error)
 468                 die(_("bad config file line %d in %s"), cf->linenr, cf->name);
 469         else
 470                 return error(_("bad config file line %d in %s"), cf->linenr, cf->name);
 471 }
 472
 473 static int parse_unit_factor(const char *end, uintmax_t *val)
 474 {
 475         if (!*end)
 476                 return 1;
 477         else if (!strcasecmp(end, "k")) {
 478                 *val *= 1024;
 479                 return 1;
 480         }
 481         else if (!strcasecmp(end, "m")) {
 482                 *val *= 1024 * 1024;
 483                 return 1;
 484         }
 485         else if (!strcasecmp(end, "g")) {
 486                 *val *= 1024 * 1024 * 1024;
 487                 return 1;
 488         }
 489         return 0;
 490 }
 491
 492 static int git_parse_signed(const char *value, intmax_t *ret, intmax_t max)
 493 {
 494         if (value && *value) {
 495                 char *end;
 496                 intmax_t val;
 497                 uintmax_t uval;
 498                 uintmax_t factor = 1;
 499
 500                 errno = 0;
 501                 val = strtoimax(value, &end, 0);
 502                 if (errno == ERANGE)
 503                         return 0;
 504                 if (!parse_unit_factor(end, &factor)) {
 505                         errno = EINVAL;
 506                         return 0;
 507                 }
 508                 uval = abs(val);
 509                 uval *= factor;
 510                 if (uval > max || abs(val) > uval) {
 511                         errno = ERANGE;
 512                         return 0;
 513                 }
 514                 val *= factor;
 515                 *ret = val;
 516                 return 1;
 517         }
 518         errno = EINVAL;
 519         return 0;
 520 }
 521
 522 static int git_parse_unsigned(const char *value, uintmax_t *ret, uintmax_t max)
 523 {
 524         if (value && *value) {
 525                 char *end;
 526                 uintmax_t val;
 527                 uintmax_t oldval;
 528
 529                 errno = 0;
 530                 val = strtoumax(value, &end, 0);
 531                 if (errno == ERANGE)
 532                         return 0;
 533                 oldval = val;
 534                 if (!parse_unit_factor(end, &val)) {
 535                         errno = EINVAL;
 536                         return 0;
 537                 }
 538                 if (val > max || oldval > val) {
 539                         errno = ERANGE;
 540                         return 0;
 541                 }
 542                 *ret = val;
 543                 return 1;
 544         }
 545         errno = EINVAL;
 546         return 0;
 547 }
 548
 549 static int git_parse_int(const char *value, int *ret)
 550 {
 551         intmax_t tmp;
 552         if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int)))
 553                 return 0;
 554         *ret = tmp;
 555         return 1;
 556 }
 557
 558 static int git_parse_int64(const char *value, int64_t *ret)
 559 {
 560         intmax_t tmp;
 561         if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int64_t)))
 562                 return 0;
 563         *ret = tmp;
 564         return 1;
 565 }
 566
 567 int git_parse_ulong(const char *value, unsigned long *ret)
 568 {
 569         uintmax_t tmp;
 570         if (!git_parse_unsigned(value, &tmp, maximum_unsigned_value_of_type(long)))
 571                 return 0;
 572         *ret = tmp;
 573         return 1;
 574 }
 575
 576 NORETURN
 577 static void die_bad_number(const char *name, const char *value)
 578 {
 579         const char *reason = errno == ERANGE ?
 580                              "out of range" :
 581                              "invalid unit";
 582         if (!value)
 583                 value = "";
 584
 585         if (cf && cf->name)
 586                 die(_("bad numeric config value '%s' for '%s' in %s: %s"),
 587                     value, name, cf->name, reason);
 588         die(_("bad numeric config value '%s' for '%s': %s"), value, name, reason);
 589 }
 590
 591 int git_config_int(const char *name, const char *value)
 592 {
 593         int ret;
 594         if (!git_parse_int(value, &ret))
 595                 die_bad_number(name, value);
 596         return ret;
 597 }
 598
 599 int64_t git_config_int64(const char *name, const char *value)
 600 {
 601         int64_t ret;
 602         if (!git_parse_int64(value, &ret))
 603                 die_bad_number(name, value);
 604         return ret;
 605 }
 606
 607 unsigned long git_config_ulong(const char *name, const char *value)
 608 {
 609         unsigned long ret;
 610         if (!git_parse_ulong(value, &ret))
 611                 die_bad_number(name, value);
 612         return ret;
 613 }
 614
 615 static int git_config_maybe_bool_text(const char *name, const char *value)
 616 {
 617         if (!value)
 618                 return 1;
 619         if (!*value)
 620                 return 0;
 621         if (!strcasecmp(value, "true")
 622             || !strcasecmp(value, "yes")
 623             || !strcasecmp(value, "on"))
 624                 return 1;
 625         if (!strcasecmp(value, "false")
 626             || !strcasecmp(value, "no")
 627             || !strcasecmp(value, "off"))
 628                 return 0;
 629         return -1;
 630 }
 631
 632 int git_config_maybe_bool(const char *name, const char *value)
 633 {
 634         int v = git_config_maybe_bool_text(name, value);
 635         if (0 <= v)
 636                 return v;
 637         if (git_parse_int(value, &v))
 638                 return !!v;
 639         return -1;
 640 }
 641
 642 int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 643 {
 644         int v = git_config_maybe_bool_text(name, value);
 645         if (0 <= v) {
 646                 *is_bool = 1;
 647                 return v;
 648         }
 649         *is_bool = 0;
 650         return git_config_int(name, value);
 651 }
 652
 653 int git_config_bool(const char *name, const char *value)
 654 {
 655         int discard;
 656         return !!git_config_bool_or_int(name, value, &discard);
 657 }
 658
 659 int git_config_string(const char **dest, const char *var, const char *value)
 660 {
 661         if (!value)
 662                 return config_error_nonbool(var);
 663         *dest = xstrdup(value);
 664         return 0;
 665 }
 666
 667 int git_config_pathname(const char **dest, const char *var, const char *value)
 668 {
 669         if (!value)
 670                 return config_error_nonbool(var);
 671         *dest = expand_user_path(value);
 672         if (!*dest)
 673                 die(_("failed to expand user dir in: '%s'"), value);
 674         return 0;
 675 }
 676
 677 static int git_default_core_config(const char *var, const char *value)
 678 {
 679         /* This needs a better name */
 680         if (!strcmp(var, "core.filemode")) {
 681                 trust_executable_bit = git_config_bool(var, value);
 682                 return 0;
 683         }
 684         if (!strcmp(var, "core.trustctime")) {
 685                 trust_ctime = git_config_bool(var, value);
 686                 return 0;
 687         }
 688         if (!strcmp(var, "core.checkstat")) {
 689                 if (!strcasecmp(value, "default"))
 690                         check_stat = 1;
 691                 else if (!strcasecmp(value, "minimal"))
 692                         check_stat = 0;
 693         }
 694
 695         if (!strcmp(var, "core.quotepath")) {
 696                 quote_path_fully = git_config_bool(var, value);
 697                 return 0;
 698         }
 699
 700         if (!strcmp(var, "core.symlinks")) {
 701                 has_symlinks = git_config_bool(var, value);
 702                 return 0;
 703         }
 704
 705         if (!strcmp(var, "core.ignorecase")) {
 706                 ignore_case = git_config_bool(var, value);
 707                 return 0;
 708         }
 709
 710         if (!strcmp(var, "core.attributesfile"))
 711                 return git_config_pathname(&git_attributes_file, var, value);
 712
 713         if (!strcmp(var, "core.bare")) {
 714                 is_bare_repository_cfg = git_config_bool(var, value);
 715                 return 0;
 716         }
 717
 718         if (!strcmp(var, "core.ignorestat")) {
 719                 assume_unchanged = git_config_bool(var, value);
 720                 return 0;
 721         }
 722
 723         if (!strcmp(var, "core.prefersymlinkrefs")) {
 724                 prefer_symlink_refs = git_config_bool(var, value);
 725                 return 0;
 726         }
 727
 728         if (!strcmp(var, "core.logallrefupdates")) {
 729                 log_all_ref_updates = git_config_bool(var, value);
 730                 return 0;
 731         }
 732
 733         if (!strcmp(var, "core.warnambiguousrefs")) {
 734                 warn_ambiguous_refs = git_config_bool(var, value);
 735                 return 0;
 736         }
 737
 738         if (!strcmp(var, "core.abbrev")) {
 739                 int abbrev = git_config_int(var, value);
 740                 if (abbrev < minimum_abbrev || abbrev > 40)
 741                         return -1;
 742                 default_abbrev = abbrev;
 743                 return 0;
 744         }
 745
 746         if (!strcmp(var, "core.loosecompression")) {
 747                 int level = git_config_int(var, value);
 748                 if (level == -1)
 749                         level = Z_DEFAULT_COMPRESSION;
 750                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 751                         die(_("bad zlib compression level %d"), level);
 752                 zlib_compression_level = level;
 753                 zlib_compression_seen = 1;
 754                 return 0;
 755         }
 756
 757         if (!strcmp(var, "core.compression")) {
 758                 int level = git_config_int(var, value);
 759                 if (level == -1)
 760                         level = Z_DEFAULT_COMPRESSION;
 761                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 762                         die(_("bad zlib compression level %d"), level);
 763                 core_compression_level = level;
 764                 core_compression_seen = 1;
 765                 if (!zlib_compression_seen)
 766                         zlib_compression_level = level;
 767                 return 0;
 768         }
 769
 770         if (!strcmp(var, "core.packedgitwindowsize")) {
 771                 int pgsz_x2 = getpagesize() * 2;
 772                 packed_git_window_size = git_config_ulong(var, value);
 773
 774                 /* This value must be multiple of (pagesize * 2) */
 775                 packed_git_window_size /= pgsz_x2;
 776                 if (packed_git_window_size < 1)
 777                         packed_git_window_size = 1;
 778                 packed_git_window_size *= pgsz_x2;
 779                 return 0;
 780         }
 781
 782         if (!strcmp(var, "core.bigfilethreshold")) {
 783                 big_file_threshold = git_config_ulong(var, value);
 784                 return 0;
 785         }
 786
 787         if (!strcmp(var, "core.packedgitlimit")) {
 788                 packed_git_limit = git_config_ulong(var, value);
 789                 return 0;
 790         }
 791
 792         if (!strcmp(var, "core.deltabasecachelimit")) {
 793                 delta_base_cache_limit = git_config_ulong(var, value);
 794                 return 0;
 795         }
 796
 797         if (!strcmp(var, "core.autocrlf")) {
 798                 if (value && !strcasecmp(value, "input")) {
 799                         if (core_eol == EOL_CRLF)
 800                                 return error("core.autocrlf=input conflicts with core.eol=crlf");
 801                         auto_crlf = AUTO_CRLF_INPUT;
 802                         return 0;
 803                 }
 804                 auto_crlf = git_config_bool(var, value);
 805                 return 0;
 806         }
 807
 808         if (!strcmp(var, "core.safecrlf")) {
 809                 if (value && !strcasecmp(value, "warn")) {
 810                         safe_crlf = SAFE_CRLF_WARN;
 811                         return 0;
 812                 }
 813                 safe_crlf = git_config_bool(var, value);
 814                 return 0;
 815         }
 816
 817         if (!strcmp(var, "core.eol")) {
 818                 if (value && !strcasecmp(value, "lf"))
 819                         core_eol = EOL_LF;
 820                 else if (value && !strcasecmp(value, "crlf"))
 821                         core_eol = EOL_CRLF;
 822                 else if (value && !strcasecmp(value, "native"))
 823                         core_eol = EOL_NATIVE;
 824                 else
 825                         core_eol = EOL_UNSET;
 826                 if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 827                         return error("core.autocrlf=input conflicts with core.eol=crlf");
 828                 return 0;
 829         }
 830
 831         if (!strcmp(var, "core.notesref")) {
 832                 notes_ref_name = xstrdup(value);
 833                 return 0;
 834         }
 835
 836         if (!strcmp(var, "core.pager"))
 837                 return git_config_string(&pager_program, var, value);
 838
 839         if (!strcmp(var, "core.editor"))
 840                 return git_config_string(&editor_program, var, value);
 841
 842         if (!strcmp(var, "core.commentchar")) {
 843                 if (!value)
 844                         return config_error_nonbool(var);
 845                 else if (!strcasecmp(value, "auto"))
 846                         auto_comment_line_char = 1;
 847                 else if (value[0] && !value[1]) {
 848                         comment_line_char = value[0];
 849                         auto_comment_line_char = 0;
 850                 } else
 851                         return error("core.commentChar should only be one character");
 852                 return 0;
 853         }
 854
 855         if (!strcmp(var, "core.askpass"))
 856                 return git_config_string(&askpass_program, var, value);
 857
 858         if (!strcmp(var, "core.excludesfile"))
 859                 return git_config_pathname(&excludes_file, var, value);
 860
 861         if (!strcmp(var, "core.whitespace")) {
 862                 if (!value)
 863                         return config_error_nonbool(var);
 864                 whitespace_rule_cfg = parse_whitespace_rule(value);
 865                 return 0;
 866         }
 867
 868         if (!strcmp(var, "core.fsyncobjectfiles")) {
 869                 fsync_object_files = git_config_bool(var, value);
 870                 return 0;
 871         }
 872
 873         if (!strcmp(var, "core.preloadindex")) {
 874                 core_preload_index = git_config_bool(var, value);
 875                 return 0;
 876         }
 877
 878         if (!strcmp(var, "core.createobject")) {
 879                 if (!strcmp(value, "rename"))
 880                         object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 881                 else if (!strcmp(value, "link"))
 882                         object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 883                 else
 884                         die(_("invalid mode for object creation: %s"), value);
 885                 return 0;
 886         }
 887
 888         if (!strcmp(var, "core.sparsecheckout")) {
 889                 core_apply_sparse_checkout = git_config_bool(var, value);
 890                 return 0;
 891         }
 892
 893         if (!strcmp(var, "core.precomposeunicode")) {
 894                 precomposed_unicode = git_config_bool(var, value);
 895                 return 0;
 896         }
 897
 898         /* Add other config variables here and to Documentation/config.txt. */
 899         return 0;
 900 }
 901
 902 static int git_default_i18n_config(const char *var, const char *value)
 903 {
 904         if (!strcmp(var, "i18n.commitencoding"))
 905                 return git_config_string(&git_commit_encoding, var, value);
 906
 907         if (!strcmp(var, "i18n.logoutputencoding"))
 908                 return git_config_string(&git_log_output_encoding, var, value);
 909
 910         /* Add other config variables here and to Documentation/config.txt. */
 911         return 0;
 912 }
 913
 914 static int git_default_branch_config(const char *var, const char *value)
 915 {
 916         if (!strcmp(var, "branch.autosetupmerge")) {
 917                 if (value && !strcasecmp(value, "always")) {
 918                         git_branch_track = BRANCH_TRACK_ALWAYS;
 919                         return 0;
 920                 }
 921                 git_branch_track = git_config_bool(var, value);
 922                 return 0;
 923         }
 924         if (!strcmp(var, "branch.autosetuprebase")) {
 925                 if (!value)
 926                         return config_error_nonbool(var);
 927                 else if (!strcmp(value, "never"))
 928                         autorebase = AUTOREBASE_NEVER;
 929                 else if (!strcmp(value, "local"))
 930                         autorebase = AUTOREBASE_LOCAL;
 931                 else if (!strcmp(value, "remote"))
 932                         autorebase = AUTOREBASE_REMOTE;
 933                 else if (!strcmp(value, "always"))
 934                         autorebase = AUTOREBASE_ALWAYS;
 935                 else
 936                         return error("Malformed value for %s", var);
 937                 return 0;
 938         }
 939
 940         /* Add other config variables here and to Documentation/config.txt. */
 941         return 0;
 942 }
 943
 944 static int git_default_push_config(const char *var, const char *value)
 945 {
 946         if (!strcmp(var, "push.default")) {
 947                 if (!value)
 948                         return config_error_nonbool(var);
 949                 else if (!strcmp(value, "nothing"))
 950                         push_default = PUSH_DEFAULT_NOTHING;
 951                 else if (!strcmp(value, "matching"))
 952                         push_default = PUSH_DEFAULT_MATCHING;
 953                 else if (!strcmp(value, "simple"))
 954                         push_default = PUSH_DEFAULT_SIMPLE;
 955                 else if (!strcmp(value, "upstream"))
 956                         push_default = PUSH_DEFAULT_UPSTREAM;
 957                 else if (!strcmp(value, "tracking")) /* deprecated */
 958                         push_default = PUSH_DEFAULT_UPSTREAM;
 959                 else if (!strcmp(value, "current"))
 960                         push_default = PUSH_DEFAULT_CURRENT;
 961                 else {
 962                         error("Malformed value for %s: %s", var, value);
 963                         return error("Must be one of nothing, matching, simple, "
 964                                      "upstream or current.");
 965                 }
 966                 return 0;
 967         }
 968
 969         /* Add other config variables here and to Documentation/config.txt. */
 970         return 0;
 971 }
 972
 973 static int git_default_mailmap_config(const char *var, const char *value)
 974 {
 975         if (!strcmp(var, "mailmap.file"))
 976                 return git_config_pathname(&git_mailmap_file, var, value);
 977         if (!strcmp(var, "mailmap.blob"))
 978                 return git_config_string(&git_mailmap_blob, var, value);
 979
 980         /* Add other config variables here and to Documentation/config.txt. */
 981         return 0;
 982 }
 983
 984 int git_default_config(const char *var, const char *value, void *dummy)
 985 {
 986         if (starts_with(var, "core."))
 987                 return git_default_core_config(var, value);
 988
 989         if (starts_with(var, "user."))
 990                 return git_ident_config(var, value, dummy);
 991
 992         if (starts_with(var, "i18n."))
 993                 return git_default_i18n_config(var, value);
 994
 995         if (starts_with(var, "branch."))
 996                 return git_default_branch_config(var, value);
 997
 998         if (starts_with(var, "push."))
 999                 return git_default_push_config(var, value);
1000
1001         if (starts_with(var, "mailmap."))
1002                 return git_default_mailmap_config(var, value);
1003
1004         if (starts_with(var, "advice."))
1005                 return git_default_advice_config(var, value);
1006
1007         if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
1008                 pager_use_color = git_config_bool(var,value);
1009                 return 0;
1010         }
1011
1012         if (!strcmp(var, "pack.packsizelimit")) {
1013                 pack_size_limit_cfg = git_config_ulong(var, value);
1014                 return 0;
1015         }
1016         /* Add other config variables here and to Documentation/config.txt. */
1017         return 0;
1018 }
1019
1020 /*
1021  * All source specific fields in the union, die_on_error, name and the callbacks
1022  * fgetc, ungetc, ftell of top need to be initialized before calling
1023  * this function.
1024  */
1025 static int do_config_from(struct config_source *top, config_fn_t fn, void *data)
1026 {
1027         int ret;
1028
1029         /* push config-file parsing state stack */
1030         top->prev = cf;
1031         top->linenr = 1;
1032         top->eof = 0;
1033         strbuf_init(&top->value, 1024);
1034         strbuf_init(&top->var, 1024);
1035         cf = top;
1036
1037         ret = git_parse_source(fn, data);
1038
1039         /* pop config-file parsing state stack */
1040         strbuf_release(&top->value);
1041         strbuf_release(&top->var);
1042         cf = top->prev;
1043
1044         return ret;
1045 }
1046
1047 static int do_config_from_file(config_fn_t fn,
1048                 const char *name, const char *path, FILE *f, void *data)
1049 {
1050         struct config_source top;
1051
1052         top.u.file = f;
1053         top.name = name;
1054         top.path = path;
1055         top.die_on_error = 1;
1056         top.do_fgetc = config_file_fgetc;
1057         top.do_ungetc = config_file_ungetc;
1058         top.do_ftell = config_file_ftell;
1059
1060         return do_config_from(&top, fn, data);
1061 }
1062
1063 static int git_config_from_stdin(config_fn_t fn, void *data)
1064 {
1065         return do_config_from_file(fn, "<stdin>", NULL, stdin, data);
1066 }
1067
1068 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
1069 {
1070         int ret = -1;
1071         FILE *f;
1072
1073         f = fopen(filename, "r");
1074         if (f) {
1075                 ret = do_config_from_file(fn, filename, filename, f, data);
1076                 fclose(f);
1077         }
1078         return ret;
1079 }
1080
1081 int git_config_from_buf(config_fn_t fn, const char *name, const char *buf,
1082                         size_t len, void *data)
1083 {
1084         struct config_source top;
1085
1086         top.u.buf.buf = buf;
1087         top.u.buf.len = len;
1088         top.u.buf.pos = 0;
1089         top.name = name;
1090         top.path = NULL;
1091         top.die_on_error = 0;
1092         top.do_fgetc = config_buf_fgetc;
1093         top.do_ungetc = config_buf_ungetc;
1094         top.do_ftell = config_buf_ftell;
1095
1096         return do_config_from(&top, fn, data);
1097 }
1098
1099 static int git_config_from_blob_sha1(config_fn_t fn,
1100                                      const char *name,
1101                                      const unsigned char *sha1,
1102                                      void *data)
1103 {
1104         enum object_type type;
1105         char *buf;
1106         unsigned long size;
1107         int ret;
1108
1109         buf = read_sha1_file(sha1, &type, &size);
1110         if (!buf)
1111                 return error("unable to load config blob object '%s'", name);
1112         if (type != OBJ_BLOB) {
1113                 free(buf);
1114                 return error("reference '%s' does not point to a blob", name);
1115         }
1116
1117         ret = git_config_from_buf(fn, name, buf, size, data);
1118         free(buf);
1119
1120         return ret;
1121 }
1122
1123 static int git_config_from_blob_ref(config_fn_t fn,
1124                                     const char *name,
1125                                     void *data)
1126 {
1127         unsigned char sha1[20];
1128
1129         if (get_sha1(name, sha1) < 0)
1130                 return error("unable to resolve config blob '%s'", name);
1131         return git_config_from_blob_sha1(fn, name, sha1, data);
1132 }
1133
1134 const char *git_etc_gitconfig(void)
1135 {
1136         static const char *system_wide;
1137         if (!system_wide)
1138                 system_wide = system_path(ETC_GITCONFIG);
1139         return system_wide;
1140 }
1141
1142 int git_env_bool(const char *k, int def)
1143 {
1144         const char *v = getenv(k);
1145         return v ? git_config_bool(k, v) : def;
1146 }
1147
1148 int git_config_system(void)
1149 {
1150         return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
1151 }
1152
1153 int git_config_early(config_fn_t fn, void *data, const char *repo_config)
1154 {
1155         int ret = 0, found = 0;
1156         char *xdg_config = NULL;
1157         char *user_config = NULL;
1158
1159         home_config_paths(&user_config, &xdg_config, "config");
1160
1161         if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0)) {
1162                 ret += git_config_from_file(fn, git_etc_gitconfig(),
1163                                             data);
1164                 found += 1;
1165         }
1166
1167         if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK)) {
1168                 ret += git_config_from_file(fn, xdg_config, data);
1169                 found += 1;
1170         }
1171
1172         if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK)) {
1173                 ret += git_config_from_file(fn, user_config, data);
1174                 found += 1;
1175         }
1176
1177         if (repo_config && !access_or_die(repo_config, R_OK, 0)) {
1178                 ret += git_config_from_file(fn, repo_config, data);
1179                 found += 1;
1180         }
1181
1182         switch (git_config_from_parameters(fn, data)) {
1183         case -1: /* error */
1184                 die(_("unable to parse command-line config"));
1185                 break;
1186         case 0: /* found nothing */
1187                 break;
1188         default: /* found at least one item */
1189                 found++;
1190                 break;
1191         }
1192
1193         free(xdg_config);
1194         free(user_config);
1195         return ret == 0 ? found : ret;
1196 }
1197
1198 int git_config_with_options(config_fn_t fn, void *data,
1199                             struct git_config_source *config_source,
1200                             int respect_includes)
1201 {
1202         char *repo_config = NULL;
1203         int ret;
1204         struct config_include_data inc = CONFIG_INCLUDE_INIT;
1205
1206         if (respect_includes) {
1207                 inc.fn = fn;
1208                 inc.data = data;
1209                 fn = git_config_include;
1210                 data = &inc;
1211         }
1212
1213         /*
1214          * If we have a specific filename, use it. Otherwise, follow the
1215          * regular lookup sequence.
1216          */
1217         if (config_source && config_source->use_stdin)
1218                 return git_config_from_stdin(fn, data);
1219         else if (config_source && config_source->file)
1220                 return git_config_from_file(fn, config_source->file, data);
1221         else if (config_source && config_source->blob)
1222                 return git_config_from_blob_ref(fn, config_source->blob, data);
1223
1224         repo_config = git_pathdup("config");
1225         ret = git_config_early(fn, data, repo_config);
1226         if (repo_config)
1227                 free(repo_config);
1228         return ret;
1229 }
1230
1231 static void git_config_raw(config_fn_t fn, void *data)
1232 {
1233         if (git_config_with_options(fn, data, NULL, 1) < 0)
1234                 /*
1235                  * git_config_with_options() normally returns only
1236                  * positive values, as most errors are fatal, and
1237                  * non-fatal potential errors are guarded by "if"
1238                  * statements that are entered only when no error is
1239                  * possible.
1240                  *
1241                  * If we ever encounter a non-fatal error, it means
1242                  * something went really wrong and we should stop
1243                  * immediately.
1244                  */
1245                 die(_("unknown error occured while reading the configuration files"));
1246 }
1247
1248 static void configset_iter(struct config_set *cs, config_fn_t fn, void *data)
1249 {
1250         int i, value_index;
1251         struct string_list *values;
1252         struct config_set_element *entry;
1253         struct configset_list *list = &cs->list;
1254         struct key_value_info *kv_info;
1255
1256         for (i = 0; i < list->nr; i++) {
1257                 entry = list->items[i].e;
1258                 value_index = list->items[i].value_index;
1259                 values = &entry->value_list;
1260                 if (fn(entry->key, values->items[value_index].string, data) < 0) {
1261                         kv_info = values->items[value_index].util;
1262                         git_die_config_linenr(entry->key, kv_info->filename, kv_info->linenr);
1263                 }
1264         }
1265 }
1266
1267 static void git_config_check_init(void);
1268
1269 void git_config(config_fn_t fn, void *data)
1270 {
1271         git_config_check_init();
1272         configset_iter(&the_config_set, fn, data);
1273 }
1274
1275 static struct config_set_element *configset_find_element(struct config_set *cs, const char *key)
1276 {
1277         struct config_set_element k;
1278         struct config_set_element *found_entry;
1279         char *normalized_key;
1280         int ret;
1281         /*
1282          * `key` may come from the user, so normalize it before using it
1283          * for querying entries from the hashmap.
1284          */
1285         ret = git_config_parse_key(key, &normalized_key, NULL);
1286
1287         if (ret)
1288                 return NULL;
1289
1290         hashmap_entry_init(&k, strhash(normalized_key));
1291         k.key = normalized_key;
1292         found_entry = hashmap_get(&cs->config_hash, &k, NULL);
1293         free(normalized_key);
1294         return found_entry;
1295 }
1296
1297 static int configset_add_value(struct config_set *cs, const char *key, const char *value)
1298 {
1299         struct config_set_element *e;
1300         struct string_list_item *si;
1301         struct configset_list_item *l_item;
1302         struct key_value_info *kv_info = xmalloc(sizeof(*kv_info));
1303
1304         e = configset_find_element(cs, key);
1305         /*
1306          * Since the keys are being fed by git_config*() callback mechanism, they
1307          * are already normalized. So simply add them without any further munging.
1308          */
1309         if (!e) {
1310                 e = xmalloc(sizeof(*e));
1311                 hashmap_entry_init(e, strhash(key));
1312                 e->key = xstrdup(key);
1313                 string_list_init(&e->value_list, 1);
1314                 hashmap_add(&cs->config_hash, e);
1315         }
1316         si = string_list_append_nodup(&e->value_list, value ? xstrdup(value) : NULL);
1317
1318         ALLOC_GROW(cs->list.items, cs->list.nr + 1, cs->list.alloc);
1319         l_item = &cs->list.items[cs->list.nr++];
1320         l_item->e = e;
1321         l_item->value_index = e->value_list.nr - 1;
1322
1323         if (cf) {
1324                 kv_info->filename = strintern(cf->name);
1325                 kv_info->linenr = cf->linenr;
1326         } else {
1327                 /* for values read from `git_config_from_parameters()` */
1328                 kv_info->filename = NULL;
1329                 kv_info->linenr = -1;
1330         }
1331         si->util = kv_info;
1332
1333         return 0;
1334 }
1335
1336 static int config_set_element_cmp(const struct config_set_element *e1,
1337                                  const struct config_set_element *e2, const void *unused)
1338 {
1339         return strcmp(e1->key, e2->key);
1340 }
1341
1342 void git_configset_init(struct config_set *cs)
1343 {
1344         hashmap_init(&cs->config_hash, (hashmap_cmp_fn)config_set_element_cmp, 0);
1345         cs->hash_initialized = 1;
1346         cs->list.nr = 0;
1347         cs->list.alloc = 0;
1348         cs->list.items = NULL;
1349 }
1350
1351 void git_configset_clear(struct config_set *cs)
1352 {
1353         struct config_set_element *entry;
1354         struct hashmap_iter iter;
1355         if (!cs->hash_initialized)
1356                 return;
1357
1358         hashmap_iter_init(&cs->config_hash, &iter);
1359         while ((entry = hashmap_iter_next(&iter))) {
1360                 free(entry->key);
1361                 string_list_clear(&entry->value_list, 1);
1362         }
1363         hashmap_free(&cs->config_hash, 1);
1364         cs->hash_initialized = 0;
1365         free(cs->list.items);
1366         cs->list.nr = 0;
1367         cs->list.alloc = 0;
1368         cs->list.items = NULL;
1369 }
1370
1371 static int config_set_callback(const char *key, const char *value, void *cb)
1372 {
1373         struct config_set *cs = cb;
1374         configset_add_value(cs, key, value);
1375         return 0;
1376 }
1377
1378 int git_configset_add_file(struct config_set *cs, const char *filename)
1379 {
1380         return git_config_from_file(config_set_callback, filename, cs);
1381 }
1382
1383 int git_configset_get_value(struct config_set *cs, const char *key, const char **value)
1384 {
1385         const struct string_list *values = NULL;
1386         /*
1387          * Follows "last one wins" semantic, i.e., if there are multiple matches for the
1388          * queried key in the files of the configset, the value returned will be the last
1389          * value in the value list for that key.
1390          */
1391         values = git_configset_get_value_multi(cs, key);
1392
1393         if (!values)
1394                 return 1;
1395         assert(values->nr > 0);
1396         *value = values->items[values->nr - 1].string;
1397         return 0;
1398 }
1399
1400 const struct string_list *git_configset_get_value_multi(struct config_set *cs, const char *key)
1401 {
1402         struct config_set_element *e = configset_find_element(cs, key);
1403         return e ? &e->value_list : NULL;
1404 }
1405
1406 int git_configset_get_string_const(struct config_set *cs, const char *key, const char **dest)
1407 {
1408         const char *value;
1409         if (!git_configset_get_value(cs, key, &value))
1410                 return git_config_string(dest, key, value);
1411         else
1412                 return 1;
1413 }
1414
1415 int git_configset_get_string(struct config_set *cs, const char *key, char **dest)
1416 {
1417         return git_configset_get_string_const(cs, key, (const char **)dest);
1418 }
1419
1420 int git_configset_get_int(struct config_set *cs, const char *key, int *dest)
1421 {
1422         const char *value;
1423         if (!git_configset_get_value(cs, key, &value)) {
1424                 *dest = git_config_int(key, value);
1425                 return 0;
1426         } else
1427                 return 1;
1428 }
1429
1430 int git_configset_get_ulong(struct config_set *cs, const char *key, unsigned long *dest)
1431 {
1432         const char *value;
1433         if (!git_configset_get_value(cs, key, &value)) {
1434                 *dest = git_config_ulong(key, value);
1435                 return 0;
1436         } else
1437                 return 1;
1438 }
1439
1440 int git_configset_get_bool(struct config_set *cs, const char *key, int *dest)
1441 {
1442         const char *value;
1443         if (!git_configset_get_value(cs, key, &value)) {
1444                 *dest = git_config_bool(key, value);
1445                 return 0;
1446         } else
1447                 return 1;
1448 }
1449
1450 int git_configset_get_bool_or_int(struct config_set *cs, const char *key,
1451                                 int *is_bool, int *dest)
1452 {
1453         const char *value;
1454         if (!git_configset_get_value(cs, key, &value)) {
1455                 *dest = git_config_bool_or_int(key, value, is_bool);
1456                 return 0;
1457         } else
1458                 return 1;
1459 }
1460
1461 int git_configset_get_maybe_bool(struct config_set *cs, const char *key, int *dest)
1462 {
1463         const char *value;
1464         if (!git_configset_get_value(cs, key, &value)) {
1465                 *dest = git_config_maybe_bool(key, value);
1466                 if (*dest == -1)
1467                         return -1;
1468                 return 0;
1469         } else
1470                 return 1;
1471 }
1472
1473 int git_configset_get_pathname(struct config_set *cs, const char *key, const char **dest)
1474 {
1475         const char *value;
1476         if (!git_configset_get_value(cs, key, &value))
1477                 return git_config_pathname(dest, key, value);
1478         else
1479                 return 1;
1480 }
1481
1482 static void git_config_check_init(void)
1483 {
1484         if (the_config_set.hash_initialized)
1485                 return;
1486         git_configset_init(&the_config_set);
1487         git_config_raw(config_set_callback, &the_config_set);
1488 }
1489
1490 void git_config_clear(void)
1491 {
1492         if (!the_config_set.hash_initialized)
1493                 return;
1494         git_configset_clear(&the_config_set);
1495 }
1496
1497 int git_config_get_value(const char *key, const char **value)
1498 {
1499         git_config_check_init();
1500         return git_configset_get_value(&the_config_set, key, value);
1501 }
1502
1503 const struct string_list *git_config_get_value_multi(const char *key)
1504 {
1505         git_config_check_init();
1506         return git_configset_get_value_multi(&the_config_set, key);
1507 }
1508
1509 int git_config_get_string_const(const char *key, const char **dest)
1510 {
1511         int ret;
1512         git_config_check_init();
1513         ret = git_configset_get_string_const(&the_config_set, key, dest);
1514         if (ret < 0)
1515                 git_die_config(key, NULL);
1516         return ret;
1517 }
1518
1519 int git_config_get_string(const char *key, char **dest)
1520 {
1521         git_config_check_init();
1522         return git_config_get_string_const(key, (const char **)dest);
1523 }
1524
1525 int git_config_get_int(const char *key, int *dest)
1526 {
1527         git_config_check_init();
1528         return git_configset_get_int(&the_config_set, key, dest);
1529 }
1530
1531 int git_config_get_ulong(const char *key, unsigned long *dest)
1532 {
1533         git_config_check_init();
1534         return git_configset_get_ulong(&the_config_set, key, dest);
1535 }
1536
1537 int git_config_get_bool(const char *key, int *dest)
1538 {
1539         git_config_check_init();
1540         return git_configset_get_bool(&the_config_set, key, dest);
1541 }
1542
1543 int git_config_get_bool_or_int(const char *key, int *is_bool, int *dest)
1544 {
1545         git_config_check_init();
1546         return git_configset_get_bool_or_int(&the_config_set, key, is_bool, dest);
1547 }
1548
1549 int git_config_get_maybe_bool(const char *key, int *dest)
1550 {
1551         git_config_check_init();
1552         return git_configset_get_maybe_bool(&the_config_set, key, dest);
1553 }
1554
1555 int git_config_get_pathname(const char *key, const char **dest)
1556 {
1557         int ret;
1558         git_config_check_init();
1559         ret = git_configset_get_pathname(&the_config_set, key, dest);
1560         if (ret < 0)
1561                 git_die_config(key, NULL);
1562         return ret;
1563 }
1564
1565 NORETURN
1566 void git_die_config_linenr(const char *key, const char *filename, int linenr)
1567 {
1568         if (!filename)
1569                 die(_("unable to parse '%s' from command-line config"), key);
1570         else
1571                 die(_("bad config variable '%s' in file '%s' at line %d"),
1572                     key, filename, linenr);
1573 }
1574
1575 NORETURN __attribute__((format(printf, 2, 3)))
1576 void git_die_config(const char *key, const char *err, ...)
1577 {
1578         const struct string_list *values;
1579         struct key_value_info *kv_info;
1580
1581         if (err) {
1582                 va_list params;
1583                 va_start(params, err);
1584                 vreportf("error: ", err, params);
1585                 va_end(params);
1586         }
1587         values = git_config_get_value_multi(key);
1588         kv_info = values->items[values->nr - 1].util;
1589         git_die_config_linenr(key, kv_info->filename, kv_info->linenr);
1590 }
1591
1592 /*
1593  * Find all the stuff for git_config_set() below.
1594  */
1595
1596 static struct {
1597         int baselen;
1598         char *key;
1599         int do_not_match;
1600         regex_t *value_regex;
1601         int multi_replace;
1602         size_t *offset;
1603         unsigned int offset_alloc;
1604         enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1605         int seen;
1606 } store;
1607
1608 static int matches(const char *key, const char *value)
1609 {
1610         return !strcmp(key, store.key) &&
1611                 (store.value_regex == NULL ||
1612                  (store.do_not_match ^
1613                   !regexec(store.value_regex, value, 0, NULL, 0)));
1614 }
1615
1616 static int store_aux(const char *key, const char *value, void *cb)
1617 {
1618         const char *ep;
1619         size_t section_len;
1620
1621         switch (store.state) {
1622         case KEY_SEEN:
1623                 if (matches(key, value)) {
1624                         if (store.seen == 1 && store.multi_replace == 0) {
1625                                 warning(_("%s has multiple values"), key);
1626                         }
1627
1628                         ALLOC_GROW(store.offset, store.seen + 1,
1629                                    store.offset_alloc);
1630
1631                         store.offset[store.seen] = cf->do_ftell(cf);
1632                         store.seen++;
1633                 }
1634                 break;
1635         case SECTION_SEEN:
1636                 /*
1637                  * What we are looking for is in store.key (both
1638                  * section and var), and its section part is baselen
1639                  * long.  We found key (again, both section and var).
1640                  * We would want to know if this key is in the same
1641                  * section as what we are looking for.  We already
1642                  * know we are in the same section as what should
1643                  * hold store.key.
1644                  */
1645                 ep = strrchr(key, '.');
1646                 section_len = ep - key;
1647
1648                 if ((section_len != store.baselen) ||
1649                     memcmp(key, store.key, section_len+1)) {
1650                         store.state = SECTION_END_SEEN;
1651                         break;
1652                 }
1653
1654                 /*
1655                  * Do not increment matches: this is no match, but we
1656                  * just made sure we are in the desired section.
1657                  */
1658                 ALLOC_GROW(store.offset, store.seen + 1,
1659                            store.offset_alloc);
1660                 store.offset[store.seen] = cf->do_ftell(cf);
1661                 /* fallthru */
1662         case SECTION_END_SEEN:
1663         case START:
1664                 if (matches(key, value)) {
1665                         ALLOC_GROW(store.offset, store.seen + 1,
1666                                    store.offset_alloc);
1667                         store.offset[store.seen] = cf->do_ftell(cf);
1668                         store.state = KEY_SEEN;
1669                         store.seen++;
1670                 } else {
1671                         if (strrchr(key, '.') - key == store.baselen &&
1672                               !strncmp(key, store.key, store.baselen)) {
1673                                         store.state = SECTION_SEEN;
1674                                         ALLOC_GROW(store.offset,
1675                                                    store.seen + 1,
1676                                                    store.offset_alloc);
1677                                         store.offset[store.seen] = cf->do_ftell(cf);
1678                         }
1679                 }
1680         }
1681         return 0;
1682 }
1683
1684 static int write_error(const char *filename)
1685 {
1686         error("failed to write new configuration file %s", filename);
1687
1688         /* Same error code as "failed to rename". */
1689         return 4;
1690 }
1691
1692 static int store_write_section(int fd, const char *key)
1693 {
1694         const char *dot;
1695         int i, success;
1696         struct strbuf sb = STRBUF_INIT;
1697
1698         dot = memchr(key, '.', store.baselen);
1699         if (dot) {
1700                 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1701                 for (i = dot - key + 1; i < store.baselen; i++) {
1702                         if (key[i] == '"' || key[i] == '\\')
1703                                 strbuf_addch(&sb, '\\');
1704                         strbuf_addch(&sb, key[i]);
1705                 }
1706                 strbuf_addstr(&sb, "\"]\n");
1707         } else {
1708                 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1709         }
1710
1711         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1712         strbuf_release(&sb);
1713
1714         return success;
1715 }
1716
1717 static int store_write_pair(int fd, const char *key, const char *value)
1718 {
1719         int i, success;
1720         int length = strlen(key + store.baselen + 1);
1721         const char *quote = "";
1722         struct strbuf sb = STRBUF_INIT;
1723
1724         /*
1725          * Check to see if the value needs to be surrounded with a dq pair.
1726          * Note that problematic characters are always backslash-quoted; this
1727          * check is about not losing leading or trailing SP and strings that
1728          * follow beginning-of-comment characters (i.e. ';' and '#') by the
1729          * configuration parser.
1730          */
1731         if (value[0] == ' ')
1732                 quote = "\"";
1733         for (i = 0; value[i]; i++)
1734                 if (value[i] == ';' || value[i] == '#')
1735                         quote = "\"";
1736         if (i && value[i - 1] == ' ')
1737                 quote = "\"";
1738
1739         strbuf_addf(&sb, "\t%.*s = %s",
1740                     length, key + store.baselen + 1, quote);
1741
1742         for (i = 0; value[i]; i++)
1743                 switch (value[i]) {
1744                 case '\n':
1745                         strbuf_addstr(&sb, "\\n");
1746                         break;
1747                 case '\t':
1748                         strbuf_addstr(&sb, "\\t");
1749                         break;
1750                 case '"':
1751                 case '\\':
1752                         strbuf_addch(&sb, '\\');
1753                 default:
1754                         strbuf_addch(&sb, value[i]);
1755                         break;
1756                 }
1757         strbuf_addf(&sb, "%s\n", quote);
1758
1759         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1760         strbuf_release(&sb);
1761
1762         return success;
1763 }
1764
1765 static ssize_t find_beginning_of_line(const char *contents, size_t size,
1766         size_t offset_, int *found_bracket)
1767 {
1768         size_t equal_offset = size, bracket_offset = size;
1769         ssize_t offset;
1770
1771 contline:
1772         for (offset = offset_-2; offset > 0
1773                         && contents[offset] != '\n'; offset--)
1774                 switch (contents[offset]) {
1775                         case '=': equal_offset = offset; break;
1776                         case ']': bracket_offset = offset; break;
1777                 }
1778         if (offset > 0 && contents[offset-1] == '\\') {
1779                 offset_ = offset;
1780                 goto contline;
1781         }
1782         if (bracket_offset < equal_offset) {
1783                 *found_bracket = 1;
1784                 offset = bracket_offset+1;
1785         } else
1786                 offset++;
1787
1788         return offset;
1789 }
1790
1791 int git_config_set_in_file(const char *config_filename,
1792                         const char *key, const char *value)
1793 {
1794         return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1795 }
1796
1797 int git_config_set(const char *key, const char *value)
1798 {
1799         return git_config_set_multivar(key, value, NULL, 0);
1800 }
1801
1802 /*
1803  * Auxiliary function to sanity-check and split the key into the section
1804  * identifier and variable name.
1805  *
1806  * Returns 0 on success, -1 when there is an invalid character in the key and
1807  * -2 if there is no section name in the key.
1808  *
1809  * store_key - pointer to char* which will hold a copy of the key with
1810  *             lowercase section and variable name
1811  * baselen - pointer to int which will hold the length of the
1812  *           section + subsection part, can be NULL
1813  */
1814 int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1815 {
1816         int i, dot, baselen;
1817         const char *last_dot = strrchr(key, '.');
1818
1819         /*
1820          * Since "key" actually contains the section name and the real
1821          * key name separated by a dot, we have to know where the dot is.
1822          */
1823
1824         if (last_dot == NULL || last_dot == key) {
1825                 error("key does not contain a section: %s", key);
1826                 return -CONFIG_NO_SECTION_OR_NAME;
1827         }
1828
1829         if (!last_dot[1]) {
1830                 error("key does not contain variable name: %s", key);
1831                 return -CONFIG_NO_SECTION_OR_NAME;
1832         }
1833
1834         baselen = last_dot - key;
1835         if (baselen_)
1836                 *baselen_ = baselen;
1837
1838         /*
1839          * Validate the key and while at it, lower case it for matching.
1840          */
1841         *store_key = xmalloc(strlen(key) + 1);
1842
1843         dot = 0;
1844         for (i = 0; key[i]; i++) {
1845                 unsigned char c = key[i];
1846                 if (c == '.')
1847                         dot = 1;
1848                 /* Leave the extended basename untouched.. */
1849                 if (!dot || i > baselen) {
1850                         if (!iskeychar(c) ||
1851                             (i == baselen + 1 && !isalpha(c))) {
1852                                 error("invalid key: %s", key);
1853                                 goto out_free_ret_1;
1854                         }
1855                         c = tolower(c);
1856                 } else if (c == '\n') {
1857                         error("invalid key (newline): %s", key);
1858                         goto out_free_ret_1;
1859                 }
1860                 (*store_key)[i] = c;
1861         }
1862         (*store_key)[i] = 0;
1863
1864         return 0;
1865
1866 out_free_ret_1:
1867         free(*store_key);
1868         *store_key = NULL;
1869         return -CONFIG_INVALID_KEY;
1870 }
1871
1872 /*
1873  * If value==NULL, unset in (remove from) config,
1874  * if value_regex!=NULL, disregard key/value pairs where value does not match.
1875  * if multi_replace==0, nothing, or only one matching key/value is replaced,
1876  *     else all matching key/values (regardless how many) are removed,
1877  *     before the new pair is written.
1878  *
1879  * Returns 0 on success.
1880  *
1881  * This function does this:
1882  *
1883  * - it locks the config file by creating ".git/config.lock"
1884  *
1885  * - it then parses the config using store_aux() as validator to find
1886  *   the position on the key/value pair to replace. If it is to be unset,
1887  *   it must be found exactly once.
1888  *
1889  * - the config file is mmap()ed and the part before the match (if any) is
1890  *   written to the lock file, then the changed part and the rest.
1891  *
1892  * - the config file is removed and the lock file rename()d to it.
1893  *
1894  */
1895 int git_config_set_multivar_in_file(const char *config_filename,
1896                                 const char *key, const char *value,
1897                                 const char *value_regex, int multi_replace)
1898 {
1899         int fd = -1, in_fd;
1900         int ret;
1901         struct lock_file *lock = NULL;
1902         char *filename_buf = NULL;
1903
1904         /* parse-key returns negative; flip the sign to feed exit(3) */
1905         ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1906         if (ret)
1907                 goto out_free;
1908
1909         store.multi_replace = multi_replace;
1910
1911         if (!config_filename)
1912                 config_filename = filename_buf = git_pathdup("config");
1913
1914         /*
1915          * The lock serves a purpose in addition to locking: the new
1916          * contents of .git/config will be written into it.
1917          */
1918         lock = xcalloc(1, sizeof(struct lock_file));
1919         fd = hold_lock_file_for_update(lock, config_filename, 0);
1920         if (fd < 0) {
1921                 error("could not lock config file %s: %s", config_filename, strerror(errno));
1922                 free(store.key);
1923                 ret = CONFIG_NO_LOCK;
1924                 goto out_free;
1925         }
1926
1927         /*
1928          * If .git/config does not exist yet, write a minimal version.
1929          */
1930         in_fd = open(config_filename, O_RDONLY);
1931         if ( in_fd < 0 ) {
1932                 free(store.key);
1933
1934                 if ( ENOENT != errno ) {
1935                         error("opening %s: %s", config_filename,
1936                               strerror(errno));
1937                         ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1938                         goto out_free;
1939                 }
1940                 /* if nothing to unset, error out */
1941                 if (value == NULL) {
1942                         ret = CONFIG_NOTHING_SET;
1943                         goto out_free;
1944                 }
1945
1946                 store.key = (char *)key;
1947                 if (!store_write_section(fd, key) ||
1948                     !store_write_pair(fd, key, value))
1949                         goto write_err_out;
1950         } else {
1951                 struct stat st;
1952                 char *contents;
1953                 size_t contents_sz, copy_begin, copy_end;
1954                 int i, new_line = 0;
1955
1956                 if (value_regex == NULL)
1957                         store.value_regex = NULL;
1958                 else {
1959                         if (value_regex[0] == '!') {
1960                                 store.do_not_match = 1;
1961                                 value_regex++;
1962                         } else
1963                                 store.do_not_match = 0;
1964
1965                         store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1966                         if (regcomp(store.value_regex, value_regex,
1967                                         REG_EXTENDED)) {
1968                                 error("invalid pattern: %s", value_regex);
1969                                 free(store.value_regex);
1970                                 ret = CONFIG_INVALID_PATTERN;
1971                                 goto out_free;
1972                         }
1973                 }
1974
1975                 ALLOC_GROW(store.offset, 1, store.offset_alloc);
1976                 store.offset[0] = 0;
1977                 store.state = START;
1978                 store.seen = 0;
1979
1980                 /*
1981                  * After this, store.offset will contain the *end* offset
1982                  * of the last match, or remain at 0 if no match was found.
1983                  * As a side effect, we make sure to transform only a valid
1984                  * existing config file.
1985                  */
1986                 if (git_config_from_file(store_aux, config_filename, NULL)) {
1987                         error("invalid config file %s", config_filename);
1988                         free(store.key);
1989                         if (store.value_regex != NULL) {
1990                                 regfree(store.value_regex);
1991                                 free(store.value_regex);
1992                         }
1993                         ret = CONFIG_INVALID_FILE;
1994                         goto out_free;
1995                 }
1996
1997                 free(store.key);
1998                 if (store.value_regex != NULL) {
1999                         regfree(store.value_regex);
2000                         free(store.value_regex);
2001                 }
2002
2003                 /* if nothing to unset, or too many matches, error out */
2004                 if ((store.seen == 0 && value == NULL) ||
2005                                 (store.seen > 1 && multi_replace == 0)) {
2006                         ret = CONFIG_NOTHING_SET;
2007                         goto out_free;
2008                 }
2009
2010                 fstat(in_fd, &st);
2011                 contents_sz = xsize_t(st.st_size);
2012                 contents = xmmap(NULL, contents_sz, PROT_READ,
2013                         MAP_PRIVATE, in_fd, 0);
2014                 close(in_fd);
2015
2016                 if (chmod(lock->filename, st.st_mode & 07777) < 0) {
2017                         error("chmod on %s failed: %s",
2018                                 lock->filename, strerror(errno));
2019                         ret = CONFIG_NO_WRITE;
2020                         goto out_free;
2021                 }
2022
2023                 if (store.seen == 0)
2024                         store.seen = 1;
2025
2026                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
2027                         if (store.offset[i] == 0) {
2028                                 store.offset[i] = copy_end = contents_sz;
2029                         } else if (store.state != KEY_SEEN) {
2030                                 copy_end = store.offset[i];
2031                         } else
2032                                 copy_end = find_beginning_of_line(
2033                                         contents, contents_sz,
2034                                         store.offset[i]-2, &new_line);
2035
2036                         if (copy_end > 0 && contents[copy_end-1] != '\n')
2037                                 new_line = 1;
2038
2039                         /* write the first part of the config */
2040                         if (copy_end > copy_begin) {
2041                                 if (write_in_full(fd, contents + copy_begin,
2042                                                   copy_end - copy_begin) <
2043                                     copy_end - copy_begin)
2044                                         goto write_err_out;
2045                                 if (new_line &&
2046                                     write_str_in_full(fd, "\n") != 1)
2047                                         goto write_err_out;
2048                         }
2049                         copy_begin = store.offset[i];
2050                 }
2051
2052                 /* write the pair (value == NULL means unset) */
2053                 if (value != NULL) {
2054                         if (store.state == START) {
2055                                 if (!store_write_section(fd, key))
2056                                         goto write_err_out;
2057                         }
2058                         if (!store_write_pair(fd, key, value))
2059                                 goto write_err_out;
2060                 }
2061
2062                 /* write the rest of the config */
2063                 if (copy_begin < contents_sz)
2064                         if (write_in_full(fd, contents + copy_begin,
2065                                           contents_sz - copy_begin) <
2066                             contents_sz - copy_begin)
2067                                 goto write_err_out;
2068
2069                 munmap(contents, contents_sz);
2070         }
2071
2072         if (commit_lock_file(lock) < 0) {
2073                 error("could not commit config file %s", config_filename);
2074                 ret = CONFIG_NO_WRITE;
2075                 goto out_free;
2076         }
2077
2078         /*
2079          * lock is committed, so don't try to roll it back below.
2080          * NOTE: Since lockfile.c keeps a linked list of all created
2081          * lock_file structures, it isn't safe to free(lock).  It's
2082          * better to just leave it hanging around.
2083          */
2084         lock = NULL;
2085         ret = 0;
2086
2087         /* Invalidate the config cache */
2088         git_config_clear();
2089
2090 out_free:
2091         if (lock)
2092                 rollback_lock_file(lock);
2093         free(filename_buf);
2094         return ret;
2095
2096 write_err_out:
2097         ret = write_error(lock->filename);
2098         goto out_free;
2099
2100 }
2101
2102 int git_config_set_multivar(const char *key, const char *value,
2103                         const char *value_regex, int multi_replace)
2104 {
2105         return git_config_set_multivar_in_file(NULL, key, value, value_regex,
2106                                                multi_replace);
2107 }
2108
2109 static int section_name_match (const char *buf, const char *name)
2110 {
2111         int i = 0, j = 0, dot = 0;
2112         if (buf[i] != '[')
2113                 return 0;
2114         for (i = 1; buf[i] && buf[i] != ']'; i++) {
2115                 if (!dot && isspace(buf[i])) {
2116                         dot = 1;
2117                         if (name[j++] != '.')
2118                                 break;
2119                         for (i++; isspace(buf[i]); i++)
2120                                 ; /* do nothing */
2121                         if (buf[i] != '"')
2122                                 break;
2123                         continue;
2124                 }
2125                 if (buf[i] == '\\' && dot)
2126                         i++;
2127                 else if (buf[i] == '"' && dot) {
2128                         for (i++; isspace(buf[i]); i++)
2129                                 ; /* do_nothing */
2130                         break;
2131                 }
2132                 if (buf[i] != name[j++])
2133                         break;
2134         }
2135         if (buf[i] == ']' && name[j] == 0) {
2136                 /*
2137                  * We match, now just find the right length offset by
2138                  * gobbling up any whitespace after it, as well
2139                  */
2140                 i++;
2141                 for (; buf[i] && isspace(buf[i]); i++)
2142                         ; /* do nothing */
2143                 return i;
2144         }
2145         return 0;
2146 }
2147
2148 static int section_name_is_ok(const char *name)
2149 {
2150         /* Empty section names are bogus. */
2151         if (!*name)
2152                 return 0;
2153
2154         /*
2155          * Before a dot, we must be alphanumeric or dash. After the first dot,
2156          * anything goes, so we can stop checking.
2157          */
2158         for (; *name && *name != '.'; name++)
2159                 if (*name != '-' && !isalnum(*name))
2160                         return 0;
2161         return 1;
2162 }
2163
2164 /* if new_name == NULL, the section is removed instead */
2165 int git_config_rename_section_in_file(const char *config_filename,
2166                                       const char *old_name, const char *new_name)
2167 {
2168         int ret = 0, remove = 0;
2169         char *filename_buf = NULL;
2170         struct lock_file *lock;
2171         int out_fd;
2172         char buf[1024];
2173         FILE *config_file;
2174         struct stat st;
2175
2176         if (new_name && !section_name_is_ok(new_name)) {
2177                 ret = error("invalid section name: %s", new_name);
2178                 goto out;
2179         }
2180
2181         if (!config_filename)
2182                 config_filename = filename_buf = git_pathdup("config");
2183
2184         lock = xcalloc(1, sizeof(struct lock_file));
2185         out_fd = hold_lock_file_for_update(lock, config_filename, 0);
2186         if (out_fd < 0) {
2187                 ret = error("could not lock config file %s", config_filename);
2188                 goto out;
2189         }
2190
2191         if (!(config_file = fopen(config_filename, "rb"))) {
2192                 /* no config file means nothing to rename, no error */
2193                 goto unlock_and_out;
2194         }
2195
2196         fstat(fileno(config_file), &st);
2197
2198         if (chmod(lock->filename, st.st_mode & 07777) < 0) {
2199                 ret = error("chmod on %s failed: %s",
2200                                 lock->filename, strerror(errno));
2201                 goto out;
2202         }
2203
2204         while (fgets(buf, sizeof(buf), config_file)) {
2205                 int i;
2206                 int length;
2207                 char *output = buf;
2208                 for (i = 0; buf[i] && isspace(buf[i]); i++)
2209                         ; /* do nothing */
2210                 if (buf[i] == '[') {
2211                         /* it's a section */
2212                         int offset = section_name_match(&buf[i], old_name);
2213                         if (offset > 0) {
2214                                 ret++;
2215                                 if (new_name == NULL) {
2216                                         remove = 1;
2217                                         continue;
2218                                 }
2219                                 store.baselen = strlen(new_name);
2220                                 if (!store_write_section(out_fd, new_name)) {
2221                                         ret = write_error(lock->filename);
2222                                         goto out;
2223                                 }
2224                                 /*
2225                                  * We wrote out the new section, with
2226                                  * a newline, now skip the old
2227                                  * section's length
2228                                  */
2229                                 output += offset + i;
2230                                 if (strlen(output) > 0) {
2231                                         /*
2232                                          * More content means there's
2233                                          * a declaration to put on the
2234                                          * next line; indent with a
2235                                          * tab
2236                                          */
2237                                         output -= 1;
2238                                         output[0] = '\t';
2239                                 }
2240                         }
2241                         remove = 0;
2242                 }
2243                 if (remove)
2244                         continue;
2245                 length = strlen(output);
2246                 if (write_in_full(out_fd, output, length) != length) {
2247                         ret = write_error(lock->filename);
2248                         goto out;
2249                 }
2250         }
2251         fclose(config_file);
2252 unlock_and_out:
2253         if (commit_lock_file(lock) < 0)
2254                 ret = error("could not commit config file %s", config_filename);
2255 out:
2256         free(filename_buf);
2257         return ret;
2258 }
2259
2260 int git_config_rename_section(const char *old_name, const char *new_name)
2261 {
2262         return git_config_rename_section_in_file(NULL, old_name, new_name);
2263 }
2264
2265 /*
2266  * Call this to report error for your variable that should not
2267  * get a boolean value (i.e. "[my] var" means "true").
2268  */
2269 #undef config_error_nonbool
2270 int config_error_nonbool(const char *var)
2271 {
2272         return error("Missing value for '%s'", var);
2273 }
2274
2275 int parse_config_key(const char *var,
2276                      const char *section,
2277                      const char **subsection, int *subsection_len,
2278                      const char **key)
2279 {
2280         int section_len = strlen(section);
2281         const char *dot;
2282
2283         /* Does it start with "section." ? */
2284         if (!starts_with(var, section) || var[section_len] != '.')
2285                 return -1;
2286
2287         /*
2288          * Find the key; we don't know yet if we have a subsection, but we must
2289          * parse backwards from the end, since the subsection may have dots in
2290          * it, too.
2291          */
2292         dot = strrchr(var, '.');
2293         *key = dot + 1;
2294
2295         /* Did we have a subsection at all? */
2296         if (dot == var + section_len) {
2297                 *subsection = NULL;
2298                 *subsection_len = 0;
2299         }
2300         else {
2301                 *subsection = var + section_len + 1;
2302                 *subsection_len = dot - *subsection;
2303         }
2304
2305         return 0;
2306 }