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