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                 const char *comment;
 836                 int ret = git_config_string(&comment, var, value);
 837                 if (ret)
 838                         return ret;
 839                 else if (!strcasecmp(comment, "auto"))
 840                         auto_comment_line_char = 1;
 841                 else if (comment[0] && !comment[1]) {
 842                         comment_line_char = comment[0];
 843                         auto_comment_line_char = 0;
 844                 } else
 845                         return error("core.commentChar should only be one character");
 846                 return 0;
 847         }
 848
 849         if (!strcmp(var, "core.askpass"))
 850                 return git_config_string(&askpass_program, var, value);
 851
 852         if (!strcmp(var, "core.excludesfile"))
 853                 return git_config_pathname(&excludes_file, var, value);
 854
 855         if (!strcmp(var, "core.whitespace")) {
 856                 if (!value)
 857                         return config_error_nonbool(var);
 858                 whitespace_rule_cfg = parse_whitespace_rule(value);
 859                 return 0;
 860         }
 861
 862         if (!strcmp(var, "core.fsyncobjectfiles")) {
 863                 fsync_object_files = git_config_bool(var, value);
 864                 return 0;
 865         }
 866
 867         if (!strcmp(var, "core.preloadindex")) {
 868                 core_preload_index = git_config_bool(var, value);
 869                 return 0;
 870         }
 871
 872         if (!strcmp(var, "core.createobject")) {
 873                 if (!strcmp(value, "rename"))
 874                         object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 875                 else if (!strcmp(value, "link"))
 876                         object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 877                 else
 878                         die("Invalid mode for object creation: %s", value);
 879                 return 0;
 880         }
 881
 882         if (!strcmp(var, "core.sparsecheckout")) {
 883                 core_apply_sparse_checkout = git_config_bool(var, value);
 884                 return 0;
 885         }
 886
 887         if (!strcmp(var, "core.precomposeunicode")) {
 888                 precomposed_unicode = git_config_bool(var, value);
 889                 return 0;
 890         }
 891
 892         /* Add other config variables here and to Documentation/config.txt. */
 893         return 0;
 894 }
 895
 896 static int git_default_i18n_config(const char *var, const char *value)
 897 {
 898         if (!strcmp(var, "i18n.commitencoding"))
 899                 return git_config_string(&git_commit_encoding, var, value);
 900
 901         if (!strcmp(var, "i18n.logoutputencoding"))
 902                 return git_config_string(&git_log_output_encoding, var, value);
 903
 904         /* Add other config variables here and to Documentation/config.txt. */
 905         return 0;
 906 }
 907
 908 static int git_default_branch_config(const char *var, const char *value)
 909 {
 910         if (!strcmp(var, "branch.autosetupmerge")) {
 911                 if (value && !strcasecmp(value, "always")) {
 912                         git_branch_track = BRANCH_TRACK_ALWAYS;
 913                         return 0;
 914                 }
 915                 git_branch_track = git_config_bool(var, value);
 916                 return 0;
 917         }
 918         if (!strcmp(var, "branch.autosetuprebase")) {
 919                 if (!value)
 920                         return config_error_nonbool(var);
 921                 else if (!strcmp(value, "never"))
 922                         autorebase = AUTOREBASE_NEVER;
 923                 else if (!strcmp(value, "local"))
 924                         autorebase = AUTOREBASE_LOCAL;
 925                 else if (!strcmp(value, "remote"))
 926                         autorebase = AUTOREBASE_REMOTE;
 927                 else if (!strcmp(value, "always"))
 928                         autorebase = AUTOREBASE_ALWAYS;
 929                 else
 930                         return error("Malformed value for %s", var);
 931                 return 0;
 932         }
 933
 934         /* Add other config variables here and to Documentation/config.txt. */
 935         return 0;
 936 }
 937
 938 static int git_default_push_config(const char *var, const char *value)
 939 {
 940         if (!strcmp(var, "push.default")) {
 941                 if (!value)
 942                         return config_error_nonbool(var);
 943                 else if (!strcmp(value, "nothing"))
 944                         push_default = PUSH_DEFAULT_NOTHING;
 945                 else if (!strcmp(value, "matching"))
 946                         push_default = PUSH_DEFAULT_MATCHING;
 947                 else if (!strcmp(value, "simple"))
 948                         push_default = PUSH_DEFAULT_SIMPLE;
 949                 else if (!strcmp(value, "upstream"))
 950                         push_default = PUSH_DEFAULT_UPSTREAM;
 951                 else if (!strcmp(value, "tracking")) /* deprecated */
 952                         push_default = PUSH_DEFAULT_UPSTREAM;
 953                 else if (!strcmp(value, "current"))
 954                         push_default = PUSH_DEFAULT_CURRENT;
 955                 else {
 956                         error("Malformed value for %s: %s", var, value);
 957                         return error("Must be one of nothing, matching, simple, "
 958                                      "upstream or current.");
 959                 }
 960                 return 0;
 961         }
 962
 963         /* Add other config variables here and to Documentation/config.txt. */
 964         return 0;
 965 }
 966
 967 static int git_default_mailmap_config(const char *var, const char *value)
 968 {
 969         if (!strcmp(var, "mailmap.file"))
 970                 return git_config_pathname(&git_mailmap_file, var, value);
 971         if (!strcmp(var, "mailmap.blob"))
 972                 return git_config_string(&git_mailmap_blob, var, value);
 973
 974         /* Add other config variables here and to Documentation/config.txt. */
 975         return 0;
 976 }
 977
 978 int git_default_config(const char *var, const char *value, void *dummy)
 979 {
 980         if (starts_with(var, "core."))
 981                 return git_default_core_config(var, value);
 982
 983         if (starts_with(var, "user."))
 984                 return git_ident_config(var, value, dummy);
 985
 986         if (starts_with(var, "i18n."))
 987                 return git_default_i18n_config(var, value);
 988
 989         if (starts_with(var, "branch."))
 990                 return git_default_branch_config(var, value);
 991
 992         if (starts_with(var, "push."))
 993                 return git_default_push_config(var, value);
 994
 995         if (starts_with(var, "mailmap."))
 996                 return git_default_mailmap_config(var, value);
 997
 998         if (starts_with(var, "advice."))
 999                 return git_default_advice_config(var, value);
1000
1001         if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
1002                 pager_use_color = git_config_bool(var,value);
1003                 return 0;
1004         }
1005
1006         if (!strcmp(var, "pack.packsizelimit")) {
1007                 pack_size_limit_cfg = git_config_ulong(var, value);
1008                 return 0;
1009         }
1010         /* Add other config variables here and to Documentation/config.txt. */
1011         return 0;
1012 }
1013
1014 /*
1015  * All source specific fields in the union, die_on_error, name and the callbacks
1016  * fgetc, ungetc, ftell of top need to be initialized before calling
1017  * this function.
1018  */
1019 static int do_config_from(struct config_source *top, config_fn_t fn, void *data)
1020 {
1021         int ret;
1022
1023         /* push config-file parsing state stack */
1024         top->prev = cf;
1025         top->linenr = 1;
1026         top->eof = 0;
1027         strbuf_init(&top->value, 1024);
1028         strbuf_init(&top->var, 1024);
1029         cf = top;
1030
1031         ret = git_parse_source(fn, data);
1032
1033         /* pop config-file parsing state stack */
1034         strbuf_release(&top->value);
1035         strbuf_release(&top->var);
1036         cf = top->prev;
1037
1038         return ret;
1039 }
1040
1041 static int do_config_from_file(config_fn_t fn,
1042                 const char *name, const char *path, FILE *f, void *data)
1043 {
1044         struct config_source top;
1045
1046         top.u.file = f;
1047         top.name = name;
1048         top.path = path;
1049         top.die_on_error = 1;
1050         top.do_fgetc = config_file_fgetc;
1051         top.do_ungetc = config_file_ungetc;
1052         top.do_ftell = config_file_ftell;
1053
1054         return do_config_from(&top, fn, data);
1055 }
1056
1057 static int git_config_from_stdin(config_fn_t fn, void *data)
1058 {
1059         return do_config_from_file(fn, "<stdin>", NULL, stdin, data);
1060 }
1061
1062 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
1063 {
1064         int ret = -1;
1065         FILE *f;
1066
1067         f = fopen(filename, "r");
1068         if (f) {
1069                 ret = do_config_from_file(fn, filename, filename, f, data);
1070                 fclose(f);
1071         }
1072         return ret;
1073 }
1074
1075 int git_config_from_buf(config_fn_t fn, const char *name, const char *buf,
1076                         size_t len, void *data)
1077 {
1078         struct config_source top;
1079
1080         top.u.buf.buf = buf;
1081         top.u.buf.len = len;
1082         top.u.buf.pos = 0;
1083         top.name = name;
1084         top.path = NULL;
1085         top.die_on_error = 0;
1086         top.do_fgetc = config_buf_fgetc;
1087         top.do_ungetc = config_buf_ungetc;
1088         top.do_ftell = config_buf_ftell;
1089
1090         return do_config_from(&top, fn, data);
1091 }
1092
1093 static int git_config_from_blob_sha1(config_fn_t fn,
1094                                      const char *name,
1095                                      const unsigned char *sha1,
1096                                      void *data)
1097 {
1098         enum object_type type;
1099         char *buf;
1100         unsigned long size;
1101         int ret;
1102
1103         buf = read_sha1_file(sha1, &type, &size);
1104         if (!buf)
1105                 return error("unable to load config blob object '%s'", name);
1106         if (type != OBJ_BLOB) {
1107                 free(buf);
1108                 return error("reference '%s' does not point to a blob", name);
1109         }
1110
1111         ret = git_config_from_buf(fn, name, buf, size, data);
1112         free(buf);
1113
1114         return ret;
1115 }
1116
1117 static int git_config_from_blob_ref(config_fn_t fn,
1118                                     const char *name,
1119                                     void *data)
1120 {
1121         unsigned char sha1[20];
1122
1123         if (get_sha1(name, sha1) < 0)
1124                 return error("unable to resolve config blob '%s'", name);
1125         return git_config_from_blob_sha1(fn, name, sha1, data);
1126 }
1127
1128 const char *git_etc_gitconfig(void)
1129 {
1130         static const char *system_wide;
1131         if (!system_wide)
1132                 system_wide = system_path(ETC_GITCONFIG);
1133         return system_wide;
1134 }
1135
1136 int git_env_bool(const char *k, int def)
1137 {
1138         const char *v = getenv(k);
1139         return v ? git_config_bool(k, v) : def;
1140 }
1141
1142 int git_config_system(void)
1143 {
1144         return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
1145 }
1146
1147 int git_config_early(config_fn_t fn, void *data, const char *repo_config)
1148 {
1149         int ret = 0, found = 0;
1150         char *xdg_config = NULL;
1151         char *user_config = NULL;
1152
1153         home_config_paths(&user_config, &xdg_config, "config");
1154
1155         if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0)) {
1156                 ret += git_config_from_file(fn, git_etc_gitconfig(),
1157                                             data);
1158                 found += 1;
1159         }
1160
1161         if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK)) {
1162                 ret += git_config_from_file(fn, xdg_config, data);
1163                 found += 1;
1164         }
1165
1166         if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK)) {
1167                 ret += git_config_from_file(fn, user_config, data);
1168                 found += 1;
1169         }
1170
1171         if (repo_config && !access_or_die(repo_config, R_OK, 0)) {
1172                 ret += git_config_from_file(fn, repo_config, data);
1173                 found += 1;
1174         }
1175
1176         switch (git_config_from_parameters(fn, data)) {
1177         case -1: /* error */
1178                 die("unable to parse command-line config");
1179                 break;
1180         case 0: /* found nothing */
1181                 break;
1182         default: /* found at least one item */
1183                 found++;
1184                 break;
1185         }
1186
1187         free(xdg_config);
1188         free(user_config);
1189         return ret == 0 ? found : ret;
1190 }
1191
1192 int git_config_with_options(config_fn_t fn, void *data,
1193                             struct git_config_source *config_source,
1194                             int respect_includes)
1195 {
1196         char *repo_config = NULL;
1197         int ret;
1198         struct config_include_data inc = CONFIG_INCLUDE_INIT;
1199
1200         if (respect_includes) {
1201                 inc.fn = fn;
1202                 inc.data = data;
1203                 fn = git_config_include;
1204                 data = &inc;
1205         }
1206
1207         /*
1208          * If we have a specific filename, use it. Otherwise, follow the
1209          * regular lookup sequence.
1210          */
1211         if (config_source && config_source->use_stdin)
1212                 return git_config_from_stdin(fn, data);
1213         else if (config_source && config_source->file)
1214                 return git_config_from_file(fn, config_source->file, data);
1215         else if (config_source && config_source->blob)
1216                 return git_config_from_blob_ref(fn, config_source->blob, data);
1217
1218         repo_config = git_pathdup("config");
1219         ret = git_config_early(fn, data, repo_config);
1220         if (repo_config)
1221                 free(repo_config);
1222         return ret;
1223 }
1224
1225 int git_config(config_fn_t fn, void *data)
1226 {
1227         return git_config_with_options(fn, data, NULL, 1);
1228 }
1229
1230 static struct config_set_element *configset_find_element(struct config_set *cs, const char *key)
1231 {
1232         struct config_set_element k;
1233         struct config_set_element *found_entry;
1234         char *normalized_key;
1235         int ret;
1236         /*
1237          * `key` may come from the user, so normalize it before using it
1238          * for querying entries from the hashmap.
1239          */
1240         ret = git_config_parse_key(key, &normalized_key, NULL);
1241
1242         if (ret)
1243                 return NULL;
1244
1245         hashmap_entry_init(&k, strhash(normalized_key));
1246         k.key = normalized_key;
1247         found_entry = hashmap_get(&cs->config_hash, &k, NULL);
1248         free(normalized_key);
1249         return found_entry;
1250 }
1251
1252 static int configset_add_value(struct config_set *cs, const char *key, const char *value)
1253 {
1254         struct config_set_element *e;
1255         e = configset_find_element(cs, key);
1256         /*
1257          * Since the keys are being fed by git_config*() callback mechanism, they
1258          * are already normalized. So simply add them without any further munging.
1259          */
1260         if (!e) {
1261                 e = xmalloc(sizeof(*e));
1262                 hashmap_entry_init(e, strhash(key));
1263                 e->key = xstrdup(key);
1264                 string_list_init(&e->value_list, 1);
1265                 hashmap_add(&cs->config_hash, e);
1266         }
1267         string_list_append_nodup(&e->value_list, value ? xstrdup(value) : NULL);
1268
1269         return 0;
1270 }
1271
1272 static int config_set_element_cmp(const struct config_set_element *e1,
1273                                  const struct config_set_element *e2, const void *unused)
1274 {
1275         return strcmp(e1->key, e2->key);
1276 }
1277
1278 void git_configset_init(struct config_set *cs)
1279 {
1280         hashmap_init(&cs->config_hash, (hashmap_cmp_fn)config_set_element_cmp, 0);
1281         cs->hash_initialized = 1;
1282 }
1283
1284 void git_configset_clear(struct config_set *cs)
1285 {
1286         struct config_set_element *entry;
1287         struct hashmap_iter iter;
1288         if (!cs->hash_initialized)
1289                 return;
1290
1291         hashmap_iter_init(&cs->config_hash, &iter);
1292         while ((entry = hashmap_iter_next(&iter))) {
1293                 free(entry->key);
1294                 string_list_clear(&entry->value_list, 0);
1295         }
1296         hashmap_free(&cs->config_hash, 1);
1297         cs->hash_initialized = 0;
1298 }
1299
1300 static int config_set_callback(const char *key, const char *value, void *cb)
1301 {
1302         struct config_set *cs = cb;
1303         configset_add_value(cs, key, value);
1304         return 0;
1305 }
1306
1307 int git_configset_add_file(struct config_set *cs, const char *filename)
1308 {
1309         return git_config_from_file(config_set_callback, filename, cs);
1310 }
1311
1312 int git_configset_get_value(struct config_set *cs, const char *key, const char **value)
1313 {
1314         const struct string_list *values = NULL;
1315         /*
1316          * Follows "last one wins" semantic, i.e., if there are multiple matches for the
1317          * queried key in the files of the configset, the value returned will be the last
1318          * value in the value list for that key.
1319          */
1320         values = git_configset_get_value_multi(cs, key);
1321
1322         if (!values)
1323                 return 1;
1324         assert(values->nr > 0);
1325         *value = values->items[values->nr - 1].string;
1326         return 0;
1327 }
1328
1329 const struct string_list *git_configset_get_value_multi(struct config_set *cs, const char *key)
1330 {
1331         struct config_set_element *e = configset_find_element(cs, key);
1332         return e ? &e->value_list : NULL;
1333 }
1334
1335 int git_configset_get_string_const(struct config_set *cs, const char *key, const char **dest)
1336 {
1337         const char *value;
1338         if (!git_configset_get_value(cs, key, &value))
1339                 return git_config_string(dest, key, value);
1340         else
1341                 return 1;
1342 }
1343
1344 int git_configset_get_string(struct config_set *cs, const char *key, char **dest)
1345 {
1346         return git_configset_get_string_const(cs, key, (const char **)dest);
1347 }
1348
1349 int git_configset_get_int(struct config_set *cs, const char *key, int *dest)
1350 {
1351         const char *value;
1352         if (!git_configset_get_value(cs, key, &value)) {
1353                 *dest = git_config_int(key, value);
1354                 return 0;
1355         } else
1356                 return 1;
1357 }
1358
1359 int git_configset_get_ulong(struct config_set *cs, const char *key, unsigned long *dest)
1360 {
1361         const char *value;
1362         if (!git_configset_get_value(cs, key, &value)) {
1363                 *dest = git_config_ulong(key, value);
1364                 return 0;
1365         } else
1366                 return 1;
1367 }
1368
1369 int git_configset_get_bool(struct config_set *cs, const char *key, int *dest)
1370 {
1371         const char *value;
1372         if (!git_configset_get_value(cs, key, &value)) {
1373                 *dest = git_config_bool(key, value);
1374                 return 0;
1375         } else
1376                 return 1;
1377 }
1378
1379 int git_configset_get_bool_or_int(struct config_set *cs, const char *key,
1380                                 int *is_bool, int *dest)
1381 {
1382         const char *value;
1383         if (!git_configset_get_value(cs, key, &value)) {
1384                 *dest = git_config_bool_or_int(key, value, is_bool);
1385                 return 0;
1386         } else
1387                 return 1;
1388 }
1389
1390 int git_configset_get_maybe_bool(struct config_set *cs, const char *key, int *dest)
1391 {
1392         const char *value;
1393         if (!git_configset_get_value(cs, key, &value)) {
1394                 *dest = git_config_maybe_bool(key, value);
1395                 if (*dest == -1)
1396                         return -1;
1397                 return 0;
1398         } else
1399                 return 1;
1400 }
1401
1402 int git_configset_get_pathname(struct config_set *cs, const char *key, const char **dest)
1403 {
1404         const char *value;
1405         if (!git_configset_get_value(cs, key, &value))
1406                 return git_config_pathname(dest, key, value);
1407         else
1408                 return 1;
1409 }
1410
1411 static void git_config_check_init(void)
1412 {
1413         if (the_config_set.hash_initialized)
1414                 return;
1415         git_configset_init(&the_config_set);
1416         git_config(config_set_callback, &the_config_set);
1417 }
1418
1419 void git_config_clear(void)
1420 {
1421         if (!the_config_set.hash_initialized)
1422                 return;
1423         git_configset_clear(&the_config_set);
1424 }
1425
1426 int git_config_get_value(const char *key, const char **value)
1427 {
1428         git_config_check_init();
1429         return git_configset_get_value(&the_config_set, key, value);
1430 }
1431
1432 const struct string_list *git_config_get_value_multi(const char *key)
1433 {
1434         git_config_check_init();
1435         return git_configset_get_value_multi(&the_config_set, key);
1436 }
1437
1438 int git_config_get_string_const(const char *key, const char **dest)
1439 {
1440         git_config_check_init();
1441         return git_configset_get_string_const(&the_config_set, key, dest);
1442 }
1443
1444 int git_config_get_string(const char *key, char **dest)
1445 {
1446         git_config_check_init();
1447         return git_config_get_string_const(key, (const char **)dest);
1448 }
1449
1450 int git_config_get_int(const char *key, int *dest)
1451 {
1452         git_config_check_init();
1453         return git_configset_get_int(&the_config_set, key, dest);
1454 }
1455
1456 int git_config_get_ulong(const char *key, unsigned long *dest)
1457 {
1458         git_config_check_init();
1459         return git_configset_get_ulong(&the_config_set, key, dest);
1460 }
1461
1462 int git_config_get_bool(const char *key, int *dest)
1463 {
1464         git_config_check_init();
1465         return git_configset_get_bool(&the_config_set, key, dest);
1466 }
1467
1468 int git_config_get_bool_or_int(const char *key, int *is_bool, int *dest)
1469 {
1470         git_config_check_init();
1471         return git_configset_get_bool_or_int(&the_config_set, key, is_bool, dest);
1472 }
1473
1474 int git_config_get_maybe_bool(const char *key, int *dest)
1475 {
1476         git_config_check_init();
1477         return git_configset_get_maybe_bool(&the_config_set, key, dest);
1478 }
1479
1480 int git_config_get_pathname(const char *key, const char **dest)
1481 {
1482         git_config_check_init();
1483         return git_configset_get_pathname(&the_config_set, key, dest);
1484 }
1485
1486 /*
1487  * Find all the stuff for git_config_set() below.
1488  */
1489
1490 static struct {
1491         int baselen;
1492         char *key;
1493         int do_not_match;
1494         regex_t *value_regex;
1495         int multi_replace;
1496         size_t *offset;
1497         unsigned int offset_alloc;
1498         enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1499         int seen;
1500 } store;
1501
1502 static int matches(const char *key, const char *value)
1503 {
1504         return !strcmp(key, store.key) &&
1505                 (store.value_regex == NULL ||
1506                  (store.do_not_match ^
1507                   !regexec(store.value_regex, value, 0, NULL, 0)));
1508 }
1509
1510 static int store_aux(const char *key, const char *value, void *cb)
1511 {
1512         const char *ep;
1513         size_t section_len;
1514
1515         switch (store.state) {
1516         case KEY_SEEN:
1517                 if (matches(key, value)) {
1518                         if (store.seen == 1 && store.multi_replace == 0) {
1519                                 warning("%s has multiple values", key);
1520                         }
1521
1522                         ALLOC_GROW(store.offset, store.seen + 1,
1523                                    store.offset_alloc);
1524
1525                         store.offset[store.seen] = cf->do_ftell(cf);
1526                         store.seen++;
1527                 }
1528                 break;
1529         case SECTION_SEEN:
1530                 /*
1531                  * What we are looking for is in store.key (both
1532                  * section and var), and its section part is baselen
1533                  * long.  We found key (again, both section and var).
1534                  * We would want to know if this key is in the same
1535                  * section as what we are looking for.  We already
1536                  * know we are in the same section as what should
1537                  * hold store.key.
1538                  */
1539                 ep = strrchr(key, '.');
1540                 section_len = ep - key;
1541
1542                 if ((section_len != store.baselen) ||
1543                     memcmp(key, store.key, section_len+1)) {
1544                         store.state = SECTION_END_SEEN;
1545                         break;
1546                 }
1547
1548                 /*
1549                  * Do not increment matches: this is no match, but we
1550                  * just made sure we are in the desired section.
1551                  */
1552                 ALLOC_GROW(store.offset, store.seen + 1,
1553                            store.offset_alloc);
1554                 store.offset[store.seen] = cf->do_ftell(cf);
1555                 /* fallthru */
1556         case SECTION_END_SEEN:
1557         case START:
1558                 if (matches(key, value)) {
1559                         ALLOC_GROW(store.offset, store.seen + 1,
1560                                    store.offset_alloc);
1561                         store.offset[store.seen] = cf->do_ftell(cf);
1562                         store.state = KEY_SEEN;
1563                         store.seen++;
1564                 } else {
1565                         if (strrchr(key, '.') - key == store.baselen &&
1566                               !strncmp(key, store.key, store.baselen)) {
1567                                         store.state = SECTION_SEEN;
1568                                         ALLOC_GROW(store.offset,
1569                                                    store.seen + 1,
1570                                                    store.offset_alloc);
1571                                         store.offset[store.seen] = cf->do_ftell(cf);
1572                         }
1573                 }
1574         }
1575         return 0;
1576 }
1577
1578 static int write_error(const char *filename)
1579 {
1580         error("failed to write new configuration file %s", filename);
1581
1582         /* Same error code as "failed to rename". */
1583         return 4;
1584 }
1585
1586 static int store_write_section(int fd, const char *key)
1587 {
1588         const char *dot;
1589         int i, success;
1590         struct strbuf sb = STRBUF_INIT;
1591
1592         dot = memchr(key, '.', store.baselen);
1593         if (dot) {
1594                 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1595                 for (i = dot - key + 1; i < store.baselen; i++) {
1596                         if (key[i] == '"' || key[i] == '\\')
1597                                 strbuf_addch(&sb, '\\');
1598                         strbuf_addch(&sb, key[i]);
1599                 }
1600                 strbuf_addstr(&sb, "\"]\n");
1601         } else {
1602                 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1603         }
1604
1605         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1606         strbuf_release(&sb);
1607
1608         return success;
1609 }
1610
1611 static int store_write_pair(int fd, const char *key, const char *value)
1612 {
1613         int i, success;
1614         int length = strlen(key + store.baselen + 1);
1615         const char *quote = "";
1616         struct strbuf sb = STRBUF_INIT;
1617
1618         /*
1619          * Check to see if the value needs to be surrounded with a dq pair.
1620          * Note that problematic characters are always backslash-quoted; this
1621          * check is about not losing leading or trailing SP and strings that
1622          * follow beginning-of-comment characters (i.e. ';' and '#') by the
1623          * configuration parser.
1624          */
1625         if (value[0] == ' ')
1626                 quote = "\"";
1627         for (i = 0; value[i]; i++)
1628                 if (value[i] == ';' || value[i] == '#')
1629                         quote = "\"";
1630         if (i && value[i - 1] == ' ')
1631                 quote = "\"";
1632
1633         strbuf_addf(&sb, "\t%.*s = %s",
1634                     length, key + store.baselen + 1, quote);
1635
1636         for (i = 0; value[i]; i++)
1637                 switch (value[i]) {
1638                 case '\n':
1639                         strbuf_addstr(&sb, "\\n");
1640                         break;
1641                 case '\t':
1642                         strbuf_addstr(&sb, "\\t");
1643                         break;
1644                 case '"':
1645                 case '\\':
1646                         strbuf_addch(&sb, '\\');
1647                 default:
1648                         strbuf_addch(&sb, value[i]);
1649                         break;
1650                 }
1651         strbuf_addf(&sb, "%s\n", quote);
1652
1653         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1654         strbuf_release(&sb);
1655
1656         return success;
1657 }
1658
1659 static ssize_t find_beginning_of_line(const char *contents, size_t size,
1660         size_t offset_, int *found_bracket)
1661 {
1662         size_t equal_offset = size, bracket_offset = size;
1663         ssize_t offset;
1664
1665 contline:
1666         for (offset = offset_-2; offset > 0
1667                         && contents[offset] != '\n'; offset--)
1668                 switch (contents[offset]) {
1669                         case '=': equal_offset = offset; break;
1670                         case ']': bracket_offset = offset; break;
1671                 }
1672         if (offset > 0 && contents[offset-1] == '\\') {
1673                 offset_ = offset;
1674                 goto contline;
1675         }
1676         if (bracket_offset < equal_offset) {
1677                 *found_bracket = 1;
1678                 offset = bracket_offset+1;
1679         } else
1680                 offset++;
1681
1682         return offset;
1683 }
1684
1685 int git_config_set_in_file(const char *config_filename,
1686                         const char *key, const char *value)
1687 {
1688         return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1689 }
1690
1691 int git_config_set(const char *key, const char *value)
1692 {
1693         return git_config_set_multivar(key, value, NULL, 0);
1694 }
1695
1696 /*
1697  * Auxiliary function to sanity-check and split the key into the section
1698  * identifier and variable name.
1699  *
1700  * Returns 0 on success, -1 when there is an invalid character in the key and
1701  * -2 if there is no section name in the key.
1702  *
1703  * store_key - pointer to char* which will hold a copy of the key with
1704  *             lowercase section and variable name
1705  * baselen - pointer to int which will hold the length of the
1706  *           section + subsection part, can be NULL
1707  */
1708 int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1709 {
1710         int i, dot, baselen;
1711         const char *last_dot = strrchr(key, '.');
1712
1713         /*
1714          * Since "key" actually contains the section name and the real
1715          * key name separated by a dot, we have to know where the dot is.
1716          */
1717
1718         if (last_dot == NULL || last_dot == key) {
1719                 error("key does not contain a section: %s", key);
1720                 return -CONFIG_NO_SECTION_OR_NAME;
1721         }
1722
1723         if (!last_dot[1]) {
1724                 error("key does not contain variable name: %s", key);
1725                 return -CONFIG_NO_SECTION_OR_NAME;
1726         }
1727
1728         baselen = last_dot - key;
1729         if (baselen_)
1730                 *baselen_ = baselen;
1731
1732         /*
1733          * Validate the key and while at it, lower case it for matching.
1734          */
1735         *store_key = xmalloc(strlen(key) + 1);
1736
1737         dot = 0;
1738         for (i = 0; key[i]; i++) {
1739                 unsigned char c = key[i];
1740                 if (c == '.')
1741                         dot = 1;
1742                 /* Leave the extended basename untouched.. */
1743                 if (!dot || i > baselen) {
1744                         if (!iskeychar(c) ||
1745                             (i == baselen + 1 && !isalpha(c))) {
1746                                 error("invalid key: %s", key);
1747                                 goto out_free_ret_1;
1748                         }
1749                         c = tolower(c);
1750                 } else if (c == '\n') {
1751                         error("invalid key (newline): %s", key);
1752                         goto out_free_ret_1;
1753                 }
1754                 (*store_key)[i] = c;
1755         }
1756         (*store_key)[i] = 0;
1757
1758         return 0;
1759
1760 out_free_ret_1:
1761         free(*store_key);
1762         *store_key = NULL;
1763         return -CONFIG_INVALID_KEY;
1764 }
1765
1766 /*
1767  * If value==NULL, unset in (remove from) config,
1768  * if value_regex!=NULL, disregard key/value pairs where value does not match.
1769  * if multi_replace==0, nothing, or only one matching key/value is replaced,
1770  *     else all matching key/values (regardless how many) are removed,
1771  *     before the new pair is written.
1772  *
1773  * Returns 0 on success.
1774  *
1775  * This function does this:
1776  *
1777  * - it locks the config file by creating ".git/config.lock"
1778  *
1779  * - it then parses the config using store_aux() as validator to find
1780  *   the position on the key/value pair to replace. If it is to be unset,
1781  *   it must be found exactly once.
1782  *
1783  * - the config file is mmap()ed and the part before the match (if any) is
1784  *   written to the lock file, then the changed part and the rest.
1785  *
1786  * - the config file is removed and the lock file rename()d to it.
1787  *
1788  */
1789 int git_config_set_multivar_in_file(const char *config_filename,
1790                                 const char *key, const char *value,
1791                                 const char *value_regex, int multi_replace)
1792 {
1793         int fd = -1, in_fd;
1794         int ret;
1795         struct lock_file *lock = NULL;
1796         char *filename_buf = NULL;
1797
1798         /* parse-key returns negative; flip the sign to feed exit(3) */
1799         ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1800         if (ret)
1801                 goto out_free;
1802
1803         store.multi_replace = multi_replace;
1804
1805         if (!config_filename)
1806                 config_filename = filename_buf = git_pathdup("config");
1807
1808         /*
1809          * The lock serves a purpose in addition to locking: the new
1810          * contents of .git/config will be written into it.
1811          */
1812         lock = xcalloc(1, sizeof(struct lock_file));
1813         fd = hold_lock_file_for_update(lock, config_filename, 0);
1814         if (fd < 0) {
1815                 error("could not lock config file %s: %s", config_filename, strerror(errno));
1816                 free(store.key);
1817                 ret = CONFIG_NO_LOCK;
1818                 goto out_free;
1819         }
1820
1821         /*
1822          * If .git/config does not exist yet, write a minimal version.
1823          */
1824         in_fd = open(config_filename, O_RDONLY);
1825         if ( in_fd < 0 ) {
1826                 free(store.key);
1827
1828                 if ( ENOENT != errno ) {
1829                         error("opening %s: %s", config_filename,
1830                               strerror(errno));
1831                         ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1832                         goto out_free;
1833                 }
1834                 /* if nothing to unset, error out */
1835                 if (value == NULL) {
1836                         ret = CONFIG_NOTHING_SET;
1837                         goto out_free;
1838                 }
1839
1840                 store.key = (char *)key;
1841                 if (!store_write_section(fd, key) ||
1842                     !store_write_pair(fd, key, value))
1843                         goto write_err_out;
1844         } else {
1845                 struct stat st;
1846                 char *contents;
1847                 size_t contents_sz, copy_begin, copy_end;
1848                 int i, new_line = 0;
1849
1850                 if (value_regex == NULL)
1851                         store.value_regex = NULL;
1852                 else {
1853                         if (value_regex[0] == '!') {
1854                                 store.do_not_match = 1;
1855                                 value_regex++;
1856                         } else
1857                                 store.do_not_match = 0;
1858
1859                         store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1860                         if (regcomp(store.value_regex, value_regex,
1861                                         REG_EXTENDED)) {
1862                                 error("invalid pattern: %s", value_regex);
1863                                 free(store.value_regex);
1864                                 ret = CONFIG_INVALID_PATTERN;
1865                                 goto out_free;
1866                         }
1867                 }
1868
1869                 ALLOC_GROW(store.offset, 1, store.offset_alloc);
1870                 store.offset[0] = 0;
1871                 store.state = START;
1872                 store.seen = 0;
1873
1874                 /*
1875                  * After this, store.offset will contain the *end* offset
1876                  * of the last match, or remain at 0 if no match was found.
1877                  * As a side effect, we make sure to transform only a valid
1878                  * existing config file.
1879                  */
1880                 if (git_config_from_file(store_aux, config_filename, NULL)) {
1881                         error("invalid config file %s", config_filename);
1882                         free(store.key);
1883                         if (store.value_regex != NULL) {
1884                                 regfree(store.value_regex);
1885                                 free(store.value_regex);
1886                         }
1887                         ret = CONFIG_INVALID_FILE;
1888                         goto out_free;
1889                 }
1890
1891                 free(store.key);
1892                 if (store.value_regex != NULL) {
1893                         regfree(store.value_regex);
1894                         free(store.value_regex);
1895                 }
1896
1897                 /* if nothing to unset, or too many matches, error out */
1898                 if ((store.seen == 0 && value == NULL) ||
1899                                 (store.seen > 1 && multi_replace == 0)) {
1900                         ret = CONFIG_NOTHING_SET;
1901                         goto out_free;
1902                 }
1903
1904                 fstat(in_fd, &st);
1905                 contents_sz = xsize_t(st.st_size);
1906                 contents = xmmap(NULL, contents_sz, PROT_READ,
1907                         MAP_PRIVATE, in_fd, 0);
1908                 close(in_fd);
1909
1910                 if (chmod(lock->filename, st.st_mode & 07777) < 0) {
1911                         error("chmod on %s failed: %s",
1912                                 lock->filename, strerror(errno));
1913                         ret = CONFIG_NO_WRITE;
1914                         goto out_free;
1915                 }
1916
1917                 if (store.seen == 0)
1918                         store.seen = 1;
1919
1920                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1921                         if (store.offset[i] == 0) {
1922                                 store.offset[i] = copy_end = contents_sz;
1923                         } else if (store.state != KEY_SEEN) {
1924                                 copy_end = store.offset[i];
1925                         } else
1926                                 copy_end = find_beginning_of_line(
1927                                         contents, contents_sz,
1928                                         store.offset[i]-2, &new_line);
1929
1930                         if (copy_end > 0 && contents[copy_end-1] != '\n')
1931                                 new_line = 1;
1932
1933                         /* write the first part of the config */
1934                         if (copy_end > copy_begin) {
1935                                 if (write_in_full(fd, contents + copy_begin,
1936                                                   copy_end - copy_begin) <
1937                                     copy_end - copy_begin)
1938                                         goto write_err_out;
1939                                 if (new_line &&
1940                                     write_str_in_full(fd, "\n") != 1)
1941                                         goto write_err_out;
1942                         }
1943                         copy_begin = store.offset[i];
1944                 }
1945
1946                 /* write the pair (value == NULL means unset) */
1947                 if (value != NULL) {
1948                         if (store.state == START) {
1949                                 if (!store_write_section(fd, key))
1950                                         goto write_err_out;
1951                         }
1952                         if (!store_write_pair(fd, key, value))
1953                                 goto write_err_out;
1954                 }
1955
1956                 /* write the rest of the config */
1957                 if (copy_begin < contents_sz)
1958                         if (write_in_full(fd, contents + copy_begin,
1959                                           contents_sz - copy_begin) <
1960                             contents_sz - copy_begin)
1961                                 goto write_err_out;
1962
1963                 munmap(contents, contents_sz);
1964         }
1965
1966         if (commit_lock_file(lock) < 0) {
1967                 error("could not commit config file %s", config_filename);
1968                 ret = CONFIG_NO_WRITE;
1969                 goto out_free;
1970         }
1971
1972         /*
1973          * lock is committed, so don't try to roll it back below.
1974          * NOTE: Since lockfile.c keeps a linked list of all created
1975          * lock_file structures, it isn't safe to free(lock).  It's
1976          * better to just leave it hanging around.
1977          */
1978         lock = NULL;
1979         ret = 0;
1980
1981         /* Invalidate the config cache */
1982         git_config_clear();
1983
1984 out_free:
1985         if (lock)
1986                 rollback_lock_file(lock);
1987         free(filename_buf);
1988         return ret;
1989
1990 write_err_out:
1991         ret = write_error(lock->filename);
1992         goto out_free;
1993
1994 }
1995
1996 int git_config_set_multivar(const char *key, const char *value,
1997                         const char *value_regex, int multi_replace)
1998 {
1999         return git_config_set_multivar_in_file(NULL, key, value, value_regex,
2000                                                multi_replace);
2001 }
2002
2003 static int section_name_match (const char *buf, const char *name)
2004 {
2005         int i = 0, j = 0, dot = 0;
2006         if (buf[i] != '[')
2007                 return 0;
2008         for (i = 1; buf[i] && buf[i] != ']'; i++) {
2009                 if (!dot && isspace(buf[i])) {
2010                         dot = 1;
2011                         if (name[j++] != '.')
2012                                 break;
2013                         for (i++; isspace(buf[i]); i++)
2014                                 ; /* do nothing */
2015                         if (buf[i] != '"')
2016                                 break;
2017                         continue;
2018                 }
2019                 if (buf[i] == '\\' && dot)
2020                         i++;
2021                 else if (buf[i] == '"' && dot) {
2022                         for (i++; isspace(buf[i]); i++)
2023                                 ; /* do_nothing */
2024                         break;
2025                 }
2026                 if (buf[i] != name[j++])
2027                         break;
2028         }
2029         if (buf[i] == ']' && name[j] == 0) {
2030                 /*
2031                  * We match, now just find the right length offset by
2032                  * gobbling up any whitespace after it, as well
2033                  */
2034                 i++;
2035                 for (; buf[i] && isspace(buf[i]); i++)
2036                         ; /* do nothing */
2037                 return i;
2038         }
2039         return 0;
2040 }
2041
2042 static int section_name_is_ok(const char *name)
2043 {
2044         /* Empty section names are bogus. */
2045         if (!*name)
2046                 return 0;
2047
2048         /*
2049          * Before a dot, we must be alphanumeric or dash. After the first dot,
2050          * anything goes, so we can stop checking.
2051          */
2052         for (; *name && *name != '.'; name++)
2053                 if (*name != '-' && !isalnum(*name))
2054                         return 0;
2055         return 1;
2056 }
2057
2058 /* if new_name == NULL, the section is removed instead */
2059 int git_config_rename_section_in_file(const char *config_filename,
2060                                       const char *old_name, const char *new_name)
2061 {
2062         int ret = 0, remove = 0;
2063         char *filename_buf = NULL;
2064         struct lock_file *lock;
2065         int out_fd;
2066         char buf[1024];
2067         FILE *config_file;
2068         struct stat st;
2069
2070         if (new_name && !section_name_is_ok(new_name)) {
2071                 ret = error("invalid section name: %s", new_name);
2072                 goto out;
2073         }
2074
2075         if (!config_filename)
2076                 config_filename = filename_buf = git_pathdup("config");
2077
2078         lock = xcalloc(1, sizeof(struct lock_file));
2079         out_fd = hold_lock_file_for_update(lock, config_filename, 0);
2080         if (out_fd < 0) {
2081                 ret = error("could not lock config file %s", config_filename);
2082                 goto out;
2083         }
2084
2085         if (!(config_file = fopen(config_filename, "rb"))) {
2086                 /* no config file means nothing to rename, no error */
2087                 goto unlock_and_out;
2088         }
2089
2090         fstat(fileno(config_file), &st);
2091
2092         if (chmod(lock->filename, st.st_mode & 07777) < 0) {
2093                 ret = error("chmod on %s failed: %s",
2094                                 lock->filename, strerror(errno));
2095                 goto out;
2096         }
2097
2098         while (fgets(buf, sizeof(buf), config_file)) {
2099                 int i;
2100                 int length;
2101                 char *output = buf;
2102                 for (i = 0; buf[i] && isspace(buf[i]); i++)
2103                         ; /* do nothing */
2104                 if (buf[i] == '[') {
2105                         /* it's a section */
2106                         int offset = section_name_match(&buf[i], old_name);
2107                         if (offset > 0) {
2108                                 ret++;
2109                                 if (new_name == NULL) {
2110                                         remove = 1;
2111                                         continue;
2112                                 }
2113                                 store.baselen = strlen(new_name);
2114                                 if (!store_write_section(out_fd, new_name)) {
2115                                         ret = write_error(lock->filename);
2116                                         goto out;
2117                                 }
2118                                 /*
2119                                  * We wrote out the new section, with
2120                                  * a newline, now skip the old
2121                                  * section's length
2122                                  */
2123                                 output += offset + i;
2124                                 if (strlen(output) > 0) {
2125                                         /*
2126                                          * More content means there's
2127                                          * a declaration to put on the
2128                                          * next line; indent with a
2129                                          * tab
2130                                          */
2131                                         output -= 1;
2132                                         output[0] = '\t';
2133                                 }
2134                         }
2135                         remove = 0;
2136                 }
2137                 if (remove)
2138                         continue;
2139                 length = strlen(output);
2140                 if (write_in_full(out_fd, output, length) != length) {
2141                         ret = write_error(lock->filename);
2142                         goto out;
2143                 }
2144         }
2145         fclose(config_file);
2146 unlock_and_out:
2147         if (commit_lock_file(lock) < 0)
2148                 ret = error("could not commit config file %s", config_filename);
2149 out:
2150         free(filename_buf);
2151         return ret;
2152 }
2153
2154 int git_config_rename_section(const char *old_name, const char *new_name)
2155 {
2156         return git_config_rename_section_in_file(NULL, old_name, new_name);
2157 }
2158
2159 /*
2160  * Call this to report error for your variable that should not
2161  * get a boolean value (i.e. "[my] var" means "true").
2162  */
2163 #undef config_error_nonbool
2164 int config_error_nonbool(const char *var)
2165 {
2166         return error("Missing value for '%s'", var);
2167 }
2168
2169 int parse_config_key(const char *var,
2170                      const char *section,
2171                      const char **subsection, int *subsection_len,
2172                      const char **key)
2173 {
2174         int section_len = strlen(section);
2175         const char *dot;
2176
2177         /* Does it start with "section." ? */
2178         if (!starts_with(var, section) || var[section_len] != '.')
2179                 return -1;
2180
2181         /*
2182          * Find the key; we don't know yet if we have a subsection, but we must
2183          * parse backwards from the end, since the subsection may have dots in
2184          * it, too.
2185          */
2186         dot = strrchr(var, '.');
2187         *key = dot + 1;
2188
2189         /* Did we have a subsection at all? */
2190         if (dot == var + section_len) {
2191                 *subsection = NULL;
2192                 *subsection_len = 0;
2193         }
2194         else {
2195                 *subsection = var + section_len + 1;
2196                 *subsection_len = dot - *subsection;
2197         }
2198
2199         return 0;
2200 }