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 "lockfile.h"
  10 #include "exec_cmd.h"
  11 #include "strbuf.h"
  12 #include "quote.h"
  13 #include "hashmap.h"
  14 #include "string-list.h"
  15 #include "utf8.h"
  16
  17 struct config_source {
  18         struct config_source *prev;
  19         union {
  20                 FILE *file;
  21                 struct config_buf {
  22                         const char *buf;
  23                         size_t len;
  24                         size_t pos;
  25                 } buf;
  26         } u;
  27         enum config_origin_type origin_type;
  28         const char *name;
  29         const char *path;
  30         int die_on_error;
  31         int linenr;
  32         int eof;
  33         struct strbuf value;
  34         struct strbuf var;
  35
  36         int (*do_fgetc)(struct config_source *c);
  37         int (*do_ungetc)(int c, struct config_source *conf);
  38         long (*do_ftell)(struct config_source *c);
  39 };
  40
  41 /*
  42  * These variables record the "current" config source, which
  43  * can be accessed by parsing callbacks.
  44  *
  45  * The "cf" variable will be non-NULL only when we are actually parsing a real
  46  * config source (file, blob, cmdline, etc).
  47  *
  48  * The "current_config_kvi" variable will be non-NULL only when we are feeding
  49  * cached config from a configset into a callback.
  50  *
  51  * They should generally never be non-NULL at the same time. If they are both
  52  * NULL, then we aren't parsing anything (and depending on the function looking
  53  * at the variables, it's either a bug for it to be called in the first place,
  54  * or it's a function which can be reused for non-config purposes, and should
  55  * fall back to some sane behavior).
  56  */
  57 static struct config_source *cf;
  58 static struct key_value_info *current_config_kvi;
  59
  60 /*
  61  * Similar to the variables above, this gives access to the "scope" of the
  62  * current value (repo, global, etc). For cached values, it can be found via
  63  * the current_config_kvi as above. During parsing, the current value can be
  64  * found in this variable. It's not part of "cf" because it transcends a single
  65  * file (i.e., a file included from .git/config is still in "repo" scope).
  66  */
  67 static enum config_scope current_parsing_scope;
  68
  69 static int zlib_compression_seen;
  70
  71 /*
  72  * Default config_set that contains key-value pairs from the usual set of config
  73  * config files (i.e repo specific .git/config, user wide ~/.gitconfig, XDG
  74  * config file and the global /etc/gitconfig)
  75  */
  76 static struct config_set the_config_set;
  77
  78 static int config_file_fgetc(struct config_source *conf)
  79 {
  80         return getc_unlocked(conf->u.file);
  81 }
  82
  83 static int config_file_ungetc(int c, struct config_source *conf)
  84 {
  85         return ungetc(c, conf->u.file);
  86 }
  87
  88 static long config_file_ftell(struct config_source *conf)
  89 {
  90         return ftell(conf->u.file);
  91 }
  92
  93
  94 static int config_buf_fgetc(struct config_source *conf)
  95 {
  96         if (conf->u.buf.pos < conf->u.buf.len)
  97                 return conf->u.buf.buf[conf->u.buf.pos++];
  98
  99         return EOF;
 100 }
 101
 102 static int config_buf_ungetc(int c, struct config_source *conf)
 103 {
 104         if (conf->u.buf.pos > 0) {
 105                 conf->u.buf.pos--;
 106                 if (conf->u.buf.buf[conf->u.buf.pos] != c)
 107                         die("BUG: config_buf can only ungetc the same character");
 108                 return c;
 109         }
 110
 111         return EOF;
 112 }
 113
 114 static long config_buf_ftell(struct config_source *conf)
 115 {
 116         return conf->u.buf.pos;
 117 }
 118
 119 #define MAX_INCLUDE_DEPTH 10
 120 static const char include_depth_advice[] =
 121 "exceeded maximum include depth (%d) while including\n"
 122 "       %s\n"
 123 "from\n"
 124 "       %s\n"
 125 "Do you have circular includes?";
 126 static int handle_path_include(const char *path, struct config_include_data *inc)
 127 {
 128         int ret = 0;
 129         struct strbuf buf = STRBUF_INIT;
 130         char *expanded;
 131
 132         if (!path)
 133                 return config_error_nonbool("include.path");
 134
 135         expanded = expand_user_path(path);
 136         if (!expanded)
 137                 return error("could not expand include path '%s'", path);
 138         path = expanded;
 139
 140         /*
 141          * Use an absolute path as-is, but interpret relative paths
 142          * based on the including config file.
 143          */
 144         if (!is_absolute_path(path)) {
 145                 char *slash;
 146
 147                 if (!cf || !cf->path)
 148                         return error("relative config includes must come from files");
 149
 150                 slash = find_last_dir_sep(cf->path);
 151                 if (slash)
 152                         strbuf_add(&buf, cf->path, slash - cf->path + 1);
 153                 strbuf_addstr(&buf, path);
 154                 path = buf.buf;
 155         }
 156
 157         if (!access_or_die(path, R_OK, 0)) {
 158                 if (++inc->depth > MAX_INCLUDE_DEPTH)
 159                         die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
 160                             !cf ? "<unknown>" :
 161                             cf->name ? cf->name :
 162                             "the command line");
 163                 ret = git_config_from_file(git_config_include, path, inc);
 164                 inc->depth--;
 165         }
 166         strbuf_release(&buf);
 167         free(expanded);
 168         return ret;
 169 }
 170
 171 int git_config_include(const char *var, const char *value, void *data)
 172 {
 173         struct config_include_data *inc = data;
 174         int ret;
 175
 176         /*
 177          * Pass along all values, including "include" directives; this makes it
 178          * possible to query information on the includes themselves.
 179          */
 180         ret = inc->fn(var, value, inc->data);
 181         if (ret < 0)
 182                 return ret;
 183
 184         if (!strcmp(var, "include.path"))
 185                 ret = handle_path_include(value, inc);
 186         return ret;
 187 }
 188
 189 void git_config_push_parameter(const char *text)
 190 {
 191         struct strbuf env = STRBUF_INIT;
 192         const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
 193         if (old && *old) {
 194                 strbuf_addstr(&env, old);
 195                 strbuf_addch(&env, ' ');
 196         }
 197         sq_quote_buf(&env, text);
 198         setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
 199         strbuf_release(&env);
 200 }
 201
 202 int git_config_parse_parameter(const char *text,
 203                                config_fn_t fn, void *data)
 204 {
 205         const char *value;
 206         struct strbuf **pair;
 207
 208         pair = strbuf_split_str(text, '=', 2);
 209         if (!pair[0])
 210                 return error("bogus config parameter: %s", text);
 211
 212         if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=') {
 213                 strbuf_setlen(pair[0], pair[0]->len - 1);
 214                 value = pair[1] ? pair[1]->buf : "";
 215         } else {
 216                 value = NULL;
 217         }
 218
 219         strbuf_trim(pair[0]);
 220         if (!pair[0]->len) {
 221                 strbuf_list_free(pair);
 222                 return error("bogus config parameter: %s", text);
 223         }
 224         strbuf_tolower(pair[0]);
 225         if (fn(pair[0]->buf, value, data) < 0) {
 226                 strbuf_list_free(pair);
 227                 return -1;
 228         }
 229         strbuf_list_free(pair);
 230         return 0;
 231 }
 232
 233 int git_config_from_parameters(config_fn_t fn, void *data)
 234 {
 235         const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 236         int ret = 0;
 237         char *envw;
 238         const char **argv = NULL;
 239         int nr = 0, alloc = 0;
 240         int i;
 241         struct config_source source;
 242
 243         if (!env)
 244                 return 0;
 245
 246         memset(&source, 0, sizeof(source));
 247         source.prev = cf;
 248         source.origin_type = CONFIG_ORIGIN_CMDLINE;
 249         cf = &source;
 250
 251         /* sq_dequote will write over it */
 252         envw = xstrdup(env);
 253
 254         if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 255                 ret = error("bogus format in " CONFIG_DATA_ENVIRONMENT);
 256                 goto out;
 257         }
 258
 259         for (i = 0; i < nr; i++) {
 260                 if (git_config_parse_parameter(argv[i], fn, data) < 0) {
 261                         ret = -1;
 262                         goto out;
 263                 }
 264         }
 265
 266 out:
 267         free(argv);
 268         free(envw);
 269         cf = source.prev;
 270         return ret;
 271 }
 272
 273 static int get_next_char(void)
 274 {
 275         int c = cf->do_fgetc(cf);
 276
 277         if (c == '\r') {
 278                 /* DOS like systems */
 279                 c = cf->do_fgetc(cf);
 280                 if (c != '\n') {
 281                         if (c != EOF)
 282                                 cf->do_ungetc(c, cf);
 283                         c = '\r';
 284                 }
 285         }
 286         if (c == '\n')
 287                 cf->linenr++;
 288         if (c == EOF) {
 289                 cf->eof = 1;
 290                 cf->linenr++;
 291                 c = '\n';
 292         }
 293         return c;
 294 }
 295
 296 static char *parse_value(void)
 297 {
 298         int quote = 0, comment = 0, space = 0;
 299
 300         strbuf_reset(&cf->value);
 301         for (;;) {
 302                 int c = get_next_char();
 303                 if (c == '\n') {
 304                         if (quote) {
 305                                 cf->linenr--;
 306                                 return NULL;
 307                         }
 308                         return cf->value.buf;
 309                 }
 310                 if (comment)
 311                         continue;
 312                 if (isspace(c) && !quote) {
 313                         if (cf->value.len)
 314                                 space++;
 315                         continue;
 316                 }
 317                 if (!quote) {
 318                         if (c == ';' || c == '#') {
 319                                 comment = 1;
 320                                 continue;
 321                         }
 322                 }
 323                 for (; space; space--)
 324                         strbuf_addch(&cf->value, ' ');
 325                 if (c == '\\') {
 326                         c = get_next_char();
 327                         switch (c) {
 328                         case '\n':
 329                                 continue;
 330                         case 't':
 331                                 c = '\t';
 332                                 break;
 333                         case 'b':
 334                                 c = '\b';
 335                                 break;
 336                         case 'n':
 337                                 c = '\n';
 338                                 break;
 339                         /* Some characters escape as themselves */
 340                         case '\\': case '"':
 341                                 break;
 342                         /* Reject unknown escape sequences */
 343                         default:
 344                                 return NULL;
 345                         }
 346                         strbuf_addch(&cf->value, c);
 347                         continue;
 348                 }
 349                 if (c == '"') {
 350                         quote = 1-quote;
 351                         continue;
 352                 }
 353                 strbuf_addch(&cf->value, c);
 354         }
 355 }
 356
 357 static inline int iskeychar(int c)
 358 {
 359         return isalnum(c) || c == '-';
 360 }
 361
 362 static int get_value(config_fn_t fn, void *data, struct strbuf *name)
 363 {
 364         int c;
 365         char *value;
 366         int ret;
 367
 368         /* Get the full name */
 369         for (;;) {
 370                 c = get_next_char();
 371                 if (cf->eof)
 372                         break;
 373                 if (!iskeychar(c))
 374                         break;
 375                 strbuf_addch(name, tolower(c));
 376         }
 377
 378         while (c == ' ' || c == '\t')
 379                 c = get_next_char();
 380
 381         value = NULL;
 382         if (c != '\n') {
 383                 if (c != '=')
 384                         return -1;
 385                 value = parse_value();
 386                 if (!value)
 387                         return -1;
 388         }
 389         /*
 390          * We already consumed the \n, but we need linenr to point to
 391          * the line we just parsed during the call to fn to get
 392          * accurate line number in error messages.
 393          */
 394         cf->linenr--;
 395         ret = fn(name->buf, value, data);
 396         cf->linenr++;
 397         return ret;
 398 }
 399
 400 static int get_extended_base_var(struct strbuf *name, int c)
 401 {
 402         do {
 403                 if (c == '\n')
 404                         goto error_incomplete_line;
 405                 c = get_next_char();
 406         } while (isspace(c));
 407
 408         /* We require the format to be '[base "extension"]' */
 409         if (c != '"')
 410                 return -1;
 411         strbuf_addch(name, '.');
 412
 413         for (;;) {
 414                 int c = get_next_char();
 415                 if (c == '\n')
 416                         goto error_incomplete_line;
 417                 if (c == '"')
 418                         break;
 419                 if (c == '\\') {
 420                         c = get_next_char();
 421                         if (c == '\n')
 422                                 goto error_incomplete_line;
 423                 }
 424                 strbuf_addch(name, c);
 425         }
 426
 427         /* Final ']' */
 428         if (get_next_char() != ']')
 429                 return -1;
 430         return 0;
 431 error_incomplete_line:
 432         cf->linenr--;
 433         return -1;
 434 }
 435
 436 static int get_base_var(struct strbuf *name)
 437 {
 438         for (;;) {
 439                 int c = get_next_char();
 440                 if (cf->eof)
 441                         return -1;
 442                 if (c == ']')
 443                         return 0;
 444                 if (isspace(c))
 445                         return get_extended_base_var(name, c);
 446                 if (!iskeychar(c) && c != '.')
 447                         return -1;
 448                 strbuf_addch(name, tolower(c));
 449         }
 450 }
 451
 452 static int git_parse_source(config_fn_t fn, void *data)
 453 {
 454         int comment = 0;
 455         int baselen = 0;
 456         struct strbuf *var = &cf->var;
 457         int error_return = 0;
 458         char *error_msg = NULL;
 459
 460         /* U+FEFF Byte Order Mark in UTF8 */
 461         const char *bomptr = utf8_bom;
 462
 463         for (;;) {
 464                 int c = get_next_char();
 465                 if (bomptr && *bomptr) {
 466                         /* We are at the file beginning; skip UTF8-encoded BOM
 467                          * if present. Sane editors won't put this in on their
 468                          * own, but e.g. Windows Notepad will do it happily. */
 469                         if (c == (*bomptr & 0377)) {
 470                                 bomptr++;
 471                                 continue;
 472                         } else {
 473                                 /* Do not tolerate partial BOM. */
 474                                 if (bomptr != utf8_bom)
 475                                         break;
 476                                 /* No BOM at file beginning. Cool. */
 477                                 bomptr = NULL;
 478                         }
 479                 }
 480                 if (c == '\n') {
 481                         if (cf->eof)
 482                                 return 0;
 483                         comment = 0;
 484                         continue;
 485                 }
 486                 if (comment || isspace(c))
 487                         continue;
 488                 if (c == '#' || c == ';') {
 489                         comment = 1;
 490                         continue;
 491                 }
 492                 if (c == '[') {
 493                         /* Reset prior to determining a new stem */
 494                         strbuf_reset(var);
 495                         if (get_base_var(var) < 0 || var->len < 1)
 496                                 break;
 497                         strbuf_addch(var, '.');
 498                         baselen = var->len;
 499                         continue;
 500                 }
 501                 if (!isalpha(c))
 502                         break;
 503                 /*
 504                  * Truncate the var name back to the section header
 505                  * stem prior to grabbing the suffix part of the name
 506                  * and the value.
 507                  */
 508                 strbuf_setlen(var, baselen);
 509                 strbuf_addch(var, tolower(c));
 510                 if (get_value(fn, data, var) < 0)
 511                         break;
 512         }
 513
 514         switch (cf->origin_type) {
 515         case CONFIG_ORIGIN_BLOB:
 516                 error_msg = xstrfmt(_("bad config line %d in blob %s"),
 517                                       cf->linenr, cf->name);
 518                 break;
 519         case CONFIG_ORIGIN_FILE:
 520                 error_msg = xstrfmt(_("bad config line %d in file %s"),
 521                                       cf->linenr, cf->name);
 522                 break;
 523         case CONFIG_ORIGIN_STDIN:
 524                 error_msg = xstrfmt(_("bad config line %d in standard input"),
 525                                       cf->linenr);
 526                 break;
 527         case CONFIG_ORIGIN_SUBMODULE_BLOB:
 528                 error_msg = xstrfmt(_("bad config line %d in submodule-blob %s"),
 529                                        cf->linenr, cf->name);
 530                 break;
 531         case CONFIG_ORIGIN_CMDLINE:
 532                 error_msg = xstrfmt(_("bad config line %d in command line %s"),
 533                                        cf->linenr, cf->name);
 534                 break;
 535         default:
 536                 error_msg = xstrfmt(_("bad config line %d in %s"),
 537                                       cf->linenr, cf->name);
 538         }
 539
 540         if (cf->die_on_error)
 541                 die("%s", error_msg);
 542         else
 543                 error_return = error("%s", error_msg);
 544
 545         free(error_msg);
 546         return error_return;
 547 }
 548
 549 static int parse_unit_factor(const char *end, uintmax_t *val)
 550 {
 551         if (!*end)
 552                 return 1;
 553         else if (!strcasecmp(end, "k")) {
 554                 *val *= 1024;
 555                 return 1;
 556         }
 557         else if (!strcasecmp(end, "m")) {
 558                 *val *= 1024 * 1024;
 559                 return 1;
 560         }
 561         else if (!strcasecmp(end, "g")) {
 562                 *val *= 1024 * 1024 * 1024;
 563                 return 1;
 564         }
 565         return 0;
 566 }
 567
 568 static int git_parse_signed(const char *value, intmax_t *ret, intmax_t max)
 569 {
 570         if (value && *value) {
 571                 char *end;
 572                 intmax_t val;
 573                 uintmax_t uval;
 574                 uintmax_t factor = 1;
 575
 576                 errno = 0;
 577                 val = strtoimax(value, &end, 0);
 578                 if (errno == ERANGE)
 579                         return 0;
 580                 if (!parse_unit_factor(end, &factor)) {
 581                         errno = EINVAL;
 582                         return 0;
 583                 }
 584                 uval = labs(val);
 585                 uval *= factor;
 586                 if (uval > max || labs(val) > uval) {
 587                         errno = ERANGE;
 588                         return 0;
 589                 }
 590                 val *= factor;
 591                 *ret = val;
 592                 return 1;
 593         }
 594         errno = EINVAL;
 595         return 0;
 596 }
 597
 598 static int git_parse_unsigned(const char *value, uintmax_t *ret, uintmax_t max)
 599 {
 600         if (value && *value) {
 601                 char *end;
 602                 uintmax_t val;
 603                 uintmax_t oldval;
 604
 605                 errno = 0;
 606                 val = strtoumax(value, &end, 0);
 607                 if (errno == ERANGE)
 608                         return 0;
 609                 oldval = val;
 610                 if (!parse_unit_factor(end, &val)) {
 611                         errno = EINVAL;
 612                         return 0;
 613                 }
 614                 if (val > max || oldval > val) {
 615                         errno = ERANGE;
 616                         return 0;
 617                 }
 618                 *ret = val;
 619                 return 1;
 620         }
 621         errno = EINVAL;
 622         return 0;
 623 }
 624
 625 static int git_parse_int(const char *value, int *ret)
 626 {
 627         intmax_t tmp;
 628         if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int)))
 629                 return 0;
 630         *ret = tmp;
 631         return 1;
 632 }
 633
 634 static int git_parse_int64(const char *value, int64_t *ret)
 635 {
 636         intmax_t tmp;
 637         if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int64_t)))
 638                 return 0;
 639         *ret = tmp;
 640         return 1;
 641 }
 642
 643 int git_parse_ulong(const char *value, unsigned long *ret)
 644 {
 645         uintmax_t tmp;
 646         if (!git_parse_unsigned(value, &tmp, maximum_unsigned_value_of_type(long)))
 647                 return 0;
 648         *ret = tmp;
 649         return 1;
 650 }
 651
 652 NORETURN
 653 static void die_bad_number(const char *name, const char *value)
 654 {
 655         const char * error_type = (errno == ERANGE)? _("out of range"):_("invalid unit");
 656
 657         if (!value)
 658                 value = "";
 659
 660         if (!(cf && cf->name))
 661                 die(_("bad numeric config value '%s' for '%s': %s"),
 662                     value, name, error_type);
 663
 664         switch (cf->origin_type) {
 665         case CONFIG_ORIGIN_BLOB:
 666                 die(_("bad numeric config value '%s' for '%s' in blob %s: %s"),
 667                     value, name, cf->name, error_type);
 668         case CONFIG_ORIGIN_FILE:
 669                 die(_("bad numeric config value '%s' for '%s' in file %s: %s"),
 670                     value, name, cf->name, error_type);
 671         case CONFIG_ORIGIN_STDIN:
 672                 die(_("bad numeric config value '%s' for '%s' in standard input: %s"),
 673                     value, name, error_type);
 674         case CONFIG_ORIGIN_SUBMODULE_BLOB:
 675                 die(_("bad numeric config value '%s' for '%s' in submodule-blob %s: %s"),
 676                     value, name, cf->name, error_type);
 677         case CONFIG_ORIGIN_CMDLINE:
 678                 die(_("bad numeric config value '%s' for '%s' in command line %s: %s"),
 679                     value, name, cf->name, error_type);
 680         default:
 681                 die(_("bad numeric config value '%s' for '%s' in %s: %s"),
 682                     value, name, cf->name, error_type);
 683         }
 684 }
 685
 686 int git_config_int(const char *name, const char *value)
 687 {
 688         int ret;
 689         if (!git_parse_int(value, &ret))
 690                 die_bad_number(name, value);
 691         return ret;
 692 }
 693
 694 int64_t git_config_int64(const char *name, const char *value)
 695 {
 696         int64_t ret;
 697         if (!git_parse_int64(value, &ret))
 698                 die_bad_number(name, value);
 699         return ret;
 700 }
 701
 702 unsigned long git_config_ulong(const char *name, const char *value)
 703 {
 704         unsigned long ret;
 705         if (!git_parse_ulong(value, &ret))
 706                 die_bad_number(name, value);
 707         return ret;
 708 }
 709
 710 int git_parse_maybe_bool(const char *value)
 711 {
 712         if (!value)
 713                 return 1;
 714         if (!*value)
 715                 return 0;
 716         if (!strcasecmp(value, "true")
 717             || !strcasecmp(value, "yes")
 718             || !strcasecmp(value, "on"))
 719                 return 1;
 720         if (!strcasecmp(value, "false")
 721             || !strcasecmp(value, "no")
 722             || !strcasecmp(value, "off"))
 723                 return 0;
 724         return -1;
 725 }
 726
 727 int git_config_maybe_bool(const char *name, const char *value)
 728 {
 729         int v = git_parse_maybe_bool(value);
 730         if (0 <= v)
 731                 return v;
 732         if (git_parse_int(value, &v))
 733                 return !!v;
 734         return -1;
 735 }
 736
 737 int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 738 {
 739         int v = git_parse_maybe_bool(value);
 740         if (0 <= v) {
 741                 *is_bool = 1;
 742                 return v;
 743         }
 744         *is_bool = 0;
 745         return git_config_int(name, value);
 746 }
 747
 748 int git_config_bool(const char *name, const char *value)
 749 {
 750         int discard;
 751         return !!git_config_bool_or_int(name, value, &discard);
 752 }
 753
 754 int git_config_string(const char **dest, const char *var, const char *value)
 755 {
 756         if (!value)
 757                 return config_error_nonbool(var);
 758         *dest = xstrdup(value);
 759         return 0;
 760 }
 761
 762 int git_config_pathname(const char **dest, const char *var, const char *value)
 763 {
 764         if (!value)
 765                 return config_error_nonbool(var);
 766         *dest = expand_user_path(value);
 767         if (!*dest)
 768                 die(_("failed to expand user dir in: '%s'"), value);
 769         return 0;
 770 }
 771
 772 static int git_default_core_config(const char *var, const char *value)
 773 {
 774         /* This needs a better name */
 775         if (!strcmp(var, "core.filemode")) {
 776                 trust_executable_bit = git_config_bool(var, value);
 777                 return 0;
 778         }
 779         if (!strcmp(var, "core.trustctime")) {
 780                 trust_ctime = git_config_bool(var, value);
 781                 return 0;
 782         }
 783         if (!strcmp(var, "core.checkstat")) {
 784                 if (!strcasecmp(value, "default"))
 785                         check_stat = 1;
 786                 else if (!strcasecmp(value, "minimal"))
 787                         check_stat = 0;
 788         }
 789
 790         if (!strcmp(var, "core.quotepath")) {
 791                 quote_path_fully = git_config_bool(var, value);
 792                 return 0;
 793         }
 794
 795         if (!strcmp(var, "core.symlinks")) {
 796                 has_symlinks = git_config_bool(var, value);
 797                 return 0;
 798         }
 799
 800         if (!strcmp(var, "core.ignorecase")) {
 801                 ignore_case = git_config_bool(var, value);
 802                 return 0;
 803         }
 804
 805         if (!strcmp(var, "core.attributesfile"))
 806                 return git_config_pathname(&git_attributes_file, var, value);
 807
 808         if (!strcmp(var, "core.hookspath"))
 809                 return git_config_pathname(&git_hooks_path, var, value);
 810
 811         if (!strcmp(var, "core.bare")) {
 812                 is_bare_repository_cfg = git_config_bool(var, value);
 813                 return 0;
 814         }
 815
 816         if (!strcmp(var, "core.ignorestat")) {
 817                 assume_unchanged = git_config_bool(var, value);
 818                 return 0;
 819         }
 820
 821         if (!strcmp(var, "core.prefersymlinkrefs")) {
 822                 prefer_symlink_refs = git_config_bool(var, value);
 823                 return 0;
 824         }
 825
 826         if (!strcmp(var, "core.logallrefupdates")) {
 827                 log_all_ref_updates = git_config_bool(var, value);
 828                 return 0;
 829         }
 830
 831         if (!strcmp(var, "core.warnambiguousrefs")) {
 832                 warn_ambiguous_refs = git_config_bool(var, value);
 833                 return 0;
 834         }
 835
 836         if (!strcmp(var, "core.abbrev")) {
 837                 if (!value)
 838                         return config_error_nonbool(var);
 839                 if (!strcasecmp(value, "auto"))
 840                         default_abbrev = -1;
 841                 else {
 842                         int abbrev = git_config_int(var, value);
 843                         if (abbrev < minimum_abbrev || abbrev > 40)
 844                                 return error("abbrev length out of range: %d", abbrev);
 845                         default_abbrev = abbrev;
 846                 }
 847                 return 0;
 848         }
 849
 850         if (!strcmp(var, "core.disambiguate"))
 851                 return set_disambiguate_hint_config(var, value);
 852
 853         if (!strcmp(var, "core.loosecompression")) {
 854                 int level = git_config_int(var, value);
 855                 if (level == -1)
 856                         level = Z_DEFAULT_COMPRESSION;
 857                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 858                         die(_("bad zlib compression level %d"), level);
 859                 zlib_compression_level = level;
 860                 zlib_compression_seen = 1;
 861                 return 0;
 862         }
 863
 864         if (!strcmp(var, "core.compression")) {
 865                 int level = git_config_int(var, value);
 866                 if (level == -1)
 867                         level = Z_DEFAULT_COMPRESSION;
 868                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 869                         die(_("bad zlib compression level %d"), level);
 870                 core_compression_level = level;
 871                 core_compression_seen = 1;
 872                 if (!zlib_compression_seen)
 873                         zlib_compression_level = level;
 874                 return 0;
 875         }
 876
 877         if (!strcmp(var, "core.packedgitwindowsize")) {
 878                 int pgsz_x2 = getpagesize() * 2;
 879                 packed_git_window_size = git_config_ulong(var, value);
 880
 881                 /* This value must be multiple of (pagesize * 2) */
 882                 packed_git_window_size /= pgsz_x2;
 883                 if (packed_git_window_size < 1)
 884                         packed_git_window_size = 1;
 885                 packed_git_window_size *= pgsz_x2;
 886                 return 0;
 887         }
 888
 889         if (!strcmp(var, "core.bigfilethreshold")) {
 890                 big_file_threshold = git_config_ulong(var, value);
 891                 return 0;
 892         }
 893
 894         if (!strcmp(var, "core.packedgitlimit")) {
 895                 packed_git_limit = git_config_ulong(var, value);
 896                 return 0;
 897         }
 898
 899         if (!strcmp(var, "core.deltabasecachelimit")) {
 900                 delta_base_cache_limit = git_config_ulong(var, value);
 901                 return 0;
 902         }
 903
 904         if (!strcmp(var, "core.autocrlf")) {
 905                 if (value && !strcasecmp(value, "input")) {
 906                         auto_crlf = AUTO_CRLF_INPUT;
 907                         return 0;
 908                 }
 909                 auto_crlf = git_config_bool(var, value);
 910                 return 0;
 911         }
 912
 913         if (!strcmp(var, "core.safecrlf")) {
 914                 if (value && !strcasecmp(value, "warn")) {
 915                         safe_crlf = SAFE_CRLF_WARN;
 916                         return 0;
 917                 }
 918                 safe_crlf = git_config_bool(var, value);
 919                 return 0;
 920         }
 921
 922         if (!strcmp(var, "core.eol")) {
 923                 if (value && !strcasecmp(value, "lf"))
 924                         core_eol = EOL_LF;
 925                 else if (value && !strcasecmp(value, "crlf"))
 926                         core_eol = EOL_CRLF;
 927                 else if (value && !strcasecmp(value, "native"))
 928                         core_eol = EOL_NATIVE;
 929                 else
 930                         core_eol = EOL_UNSET;
 931                 return 0;
 932         }
 933
 934         if (!strcmp(var, "core.notesref")) {
 935                 notes_ref_name = xstrdup(value);
 936                 return 0;
 937         }
 938
 939         if (!strcmp(var, "core.editor"))
 940                 return git_config_string(&editor_program, var, value);
 941
 942         if (!strcmp(var, "core.commentchar")) {
 943                 if (!value)
 944                         return config_error_nonbool(var);
 945                 else if (!strcasecmp(value, "auto"))
 946                         auto_comment_line_char = 1;
 947                 else if (value[0] && !value[1]) {
 948                         comment_line_char = value[0];
 949                         auto_comment_line_char = 0;
 950                 } else
 951                         return error("core.commentChar should only be one character");
 952                 return 0;
 953         }
 954
 955         if (!strcmp(var, "core.askpass"))
 956                 return git_config_string(&askpass_program, var, value);
 957
 958         if (!strcmp(var, "core.excludesfile"))
 959                 return git_config_pathname(&excludes_file, var, value);
 960
 961         if (!strcmp(var, "core.whitespace")) {
 962                 if (!value)
 963                         return config_error_nonbool(var);
 964                 whitespace_rule_cfg = parse_whitespace_rule(value);
 965                 return 0;
 966         }
 967
 968         if (!strcmp(var, "core.fsyncobjectfiles")) {
 969                 fsync_object_files = git_config_bool(var, value);
 970                 return 0;
 971         }
 972
 973         if (!strcmp(var, "core.preloadindex")) {
 974                 core_preload_index = git_config_bool(var, value);
 975                 return 0;
 976         }
 977
 978         if (!strcmp(var, "core.createobject")) {
 979                 if (!strcmp(value, "rename"))
 980                         object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 981                 else if (!strcmp(value, "link"))
 982                         object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 983                 else
 984                         die(_("invalid mode for object creation: %s"), value);
 985                 return 0;
 986         }
 987
 988         if (!strcmp(var, "core.sparsecheckout")) {
 989                 core_apply_sparse_checkout = git_config_bool(var, value);
 990                 return 0;
 991         }
 992
 993         if (!strcmp(var, "core.precomposeunicode")) {
 994                 precomposed_unicode = git_config_bool(var, value);
 995                 return 0;
 996         }
 997
 998         if (!strcmp(var, "core.protecthfs")) {
 999                 protect_hfs = git_config_bool(var, value);
1000                 return 0;
1001         }
1002
1003         if (!strcmp(var, "core.protectntfs")) {
1004                 protect_ntfs = git_config_bool(var, value);
1005                 return 0;
1006         }
1007
1008         if (!strcmp(var, "core.hidedotfiles")) {
1009                 if (value && !strcasecmp(value, "dotgitonly"))
1010                         hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
1011                 else
1012                         hide_dotfiles = git_config_bool(var, value);
1013                 return 0;
1014         }
1015
1016         /* Add other config variables here and to Documentation/config.txt. */
1017         return 0;
1018 }
1019
1020 static int git_default_i18n_config(const char *var, const char *value)
1021 {
1022         if (!strcmp(var, "i18n.commitencoding"))
1023                 return git_config_string(&git_commit_encoding, var, value);
1024
1025         if (!strcmp(var, "i18n.logoutputencoding"))
1026                 return git_config_string(&git_log_output_encoding, var, value);
1027
1028         /* Add other config variables here and to Documentation/config.txt. */
1029         return 0;
1030 }
1031
1032 static int git_default_branch_config(const char *var, const char *value)
1033 {
1034         if (!strcmp(var, "branch.autosetupmerge")) {
1035                 if (value && !strcasecmp(value, "always")) {
1036                         git_branch_track = BRANCH_TRACK_ALWAYS;
1037                         return 0;
1038                 }
1039                 git_branch_track = git_config_bool(var, value);
1040                 return 0;
1041         }
1042         if (!strcmp(var, "branch.autosetuprebase")) {
1043                 if (!value)
1044                         return config_error_nonbool(var);
1045                 else if (!strcmp(value, "never"))
1046                         autorebase = AUTOREBASE_NEVER;
1047                 else if (!strcmp(value, "local"))
1048                         autorebase = AUTOREBASE_LOCAL;
1049                 else if (!strcmp(value, "remote"))
1050                         autorebase = AUTOREBASE_REMOTE;
1051                 else if (!strcmp(value, "always"))
1052                         autorebase = AUTOREBASE_ALWAYS;
1053                 else
1054                         return error("malformed value for %s", var);
1055                 return 0;
1056         }
1057
1058         /* Add other config variables here and to Documentation/config.txt. */
1059         return 0;
1060 }
1061
1062 static int git_default_push_config(const char *var, const char *value)
1063 {
1064         if (!strcmp(var, "push.default")) {
1065                 if (!value)
1066                         return config_error_nonbool(var);
1067                 else if (!strcmp(value, "nothing"))
1068                         push_default = PUSH_DEFAULT_NOTHING;
1069                 else if (!strcmp(value, "matching"))
1070                         push_default = PUSH_DEFAULT_MATCHING;
1071                 else if (!strcmp(value, "simple"))
1072                         push_default = PUSH_DEFAULT_SIMPLE;
1073                 else if (!strcmp(value, "upstream"))
1074                         push_default = PUSH_DEFAULT_UPSTREAM;
1075                 else if (!strcmp(value, "tracking")) /* deprecated */
1076                         push_default = PUSH_DEFAULT_UPSTREAM;
1077                 else if (!strcmp(value, "current"))
1078                         push_default = PUSH_DEFAULT_CURRENT;
1079                 else {
1080                         error("malformed value for %s: %s", var, value);
1081                         return error("Must be one of nothing, matching, simple, "
1082                                      "upstream or current.");
1083                 }
1084                 return 0;
1085         }
1086
1087         /* Add other config variables here and to Documentation/config.txt. */
1088         return 0;
1089 }
1090
1091 static int git_default_mailmap_config(const char *var, const char *value)
1092 {
1093         if (!strcmp(var, "mailmap.file"))
1094                 return git_config_pathname(&git_mailmap_file, var, value);
1095         if (!strcmp(var, "mailmap.blob"))
1096                 return git_config_string(&git_mailmap_blob, var, value);
1097
1098         /* Add other config variables here and to Documentation/config.txt. */
1099         return 0;
1100 }
1101
1102 int git_default_config(const char *var, const char *value, void *dummy)
1103 {
1104         if (starts_with(var, "core."))
1105                 return git_default_core_config(var, value);
1106
1107         if (starts_with(var, "user."))
1108                 return git_ident_config(var, value, dummy);
1109
1110         if (starts_with(var, "i18n."))
1111                 return git_default_i18n_config(var, value);
1112
1113         if (starts_with(var, "branch."))
1114                 return git_default_branch_config(var, value);
1115
1116         if (starts_with(var, "push."))
1117                 return git_default_push_config(var, value);
1118
1119         if (starts_with(var, "mailmap."))
1120                 return git_default_mailmap_config(var, value);
1121
1122         if (starts_with(var, "advice."))
1123                 return git_default_advice_config(var, value);
1124
1125         if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
1126                 pager_use_color = git_config_bool(var,value);
1127                 return 0;
1128         }
1129
1130         if (!strcmp(var, "pack.packsizelimit")) {
1131                 pack_size_limit_cfg = git_config_ulong(var, value);
1132                 return 0;
1133         }
1134         /* Add other config variables here and to Documentation/config.txt. */
1135         return 0;
1136 }
1137
1138 /*
1139  * All source specific fields in the union, die_on_error, name and the callbacks
1140  * fgetc, ungetc, ftell of top need to be initialized before calling
1141  * this function.
1142  */
1143 static int do_config_from(struct config_source *top, config_fn_t fn, void *data)
1144 {
1145         int ret;
1146
1147         /* push config-file parsing state stack */
1148         top->prev = cf;
1149         top->linenr = 1;
1150         top->eof = 0;
1151         strbuf_init(&top->value, 1024);
1152         strbuf_init(&top->var, 1024);
1153         cf = top;
1154
1155         ret = git_parse_source(fn, data);
1156
1157         /* pop config-file parsing state stack */
1158         strbuf_release(&top->value);
1159         strbuf_release(&top->var);
1160         cf = top->prev;
1161
1162         return ret;
1163 }
1164
1165 static int do_config_from_file(config_fn_t fn,
1166                 const enum config_origin_type origin_type,
1167                 const char *name, const char *path, FILE *f,
1168                 void *data)
1169 {
1170         struct config_source top;
1171
1172         top.u.file = f;
1173         top.origin_type = origin_type;
1174         top.name = name;
1175         top.path = path;
1176         top.die_on_error = 1;
1177         top.do_fgetc = config_file_fgetc;
1178         top.do_ungetc = config_file_ungetc;
1179         top.do_ftell = config_file_ftell;
1180
1181         return do_config_from(&top, fn, data);
1182 }
1183
1184 static int git_config_from_stdin(config_fn_t fn, void *data)
1185 {
1186         return do_config_from_file(fn, CONFIG_ORIGIN_STDIN, "", NULL, stdin, data);
1187 }
1188
1189 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
1190 {
1191         int ret = -1;
1192         FILE *f;
1193
1194         f = fopen(filename, "r");
1195         if (f) {
1196                 flockfile(f);
1197                 ret = do_config_from_file(fn, CONFIG_ORIGIN_FILE, filename, filename, f, data);
1198                 funlockfile(f);
1199                 fclose(f);
1200         }
1201         return ret;
1202 }
1203
1204 int git_config_from_mem(config_fn_t fn, const enum config_origin_type origin_type,
1205                         const char *name, const char *buf, size_t len, void *data)
1206 {
1207         struct config_source top;
1208
1209         top.u.buf.buf = buf;
1210         top.u.buf.len = len;
1211         top.u.buf.pos = 0;
1212         top.origin_type = origin_type;
1213         top.name = name;
1214         top.path = NULL;
1215         top.die_on_error = 0;
1216         top.do_fgetc = config_buf_fgetc;
1217         top.do_ungetc = config_buf_ungetc;
1218         top.do_ftell = config_buf_ftell;
1219
1220         return do_config_from(&top, fn, data);
1221 }
1222
1223 static int git_config_from_blob_sha1(config_fn_t fn,
1224                                      const char *name,
1225                                      const unsigned char *sha1,
1226                                      void *data)
1227 {
1228         enum object_type type;
1229         char *buf;
1230         unsigned long size;
1231         int ret;
1232
1233         buf = read_sha1_file(sha1, &type, &size);
1234         if (!buf)
1235                 return error("unable to load config blob object '%s'", name);
1236         if (type != OBJ_BLOB) {
1237                 free(buf);
1238                 return error("reference '%s' does not point to a blob", name);
1239         }
1240
1241         ret = git_config_from_mem(fn, CONFIG_ORIGIN_BLOB, name, buf, size, data);
1242         free(buf);
1243
1244         return ret;
1245 }
1246
1247 static int git_config_from_blob_ref(config_fn_t fn,
1248                                     const char *name,
1249                                     void *data)
1250 {
1251         unsigned char sha1[20];
1252
1253         if (get_sha1(name, sha1) < 0)
1254                 return error("unable to resolve config blob '%s'", name);
1255         return git_config_from_blob_sha1(fn, name, sha1, data);
1256 }
1257
1258 const char *git_etc_gitconfig(void)
1259 {
1260         static const char *system_wide;
1261         if (!system_wide)
1262                 system_wide = system_path(ETC_GITCONFIG);
1263         return system_wide;
1264 }
1265
1266 /*
1267  * Parse environment variable 'k' as a boolean (in various
1268  * possible spellings); if missing, use the default value 'def'.
1269  */
1270 int git_env_bool(const char *k, int def)
1271 {
1272         const char *v = getenv(k);
1273         return v ? git_config_bool(k, v) : def;
1274 }
1275
1276 /*
1277  * Parse environment variable 'k' as ulong with possibly a unit
1278  * suffix; if missing, use the default value 'val'.
1279  */
1280 unsigned long git_env_ulong(const char *k, unsigned long val)
1281 {
1282         const char *v = getenv(k);
1283         if (v && !git_parse_ulong(v, &val))
1284                 die("failed to parse %s", k);
1285         return val;
1286 }
1287
1288 int git_config_system(void)
1289 {
1290         return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
1291 }
1292
1293 static int do_git_config_sequence(config_fn_t fn, void *data)
1294 {
1295         int ret = 0;
1296         char *xdg_config = xdg_config_home("config");
1297         char *user_config = expand_user_path("~/.gitconfig");
1298         char *repo_config = have_git_dir() ? git_pathdup("config") : NULL;
1299
1300         current_parsing_scope = CONFIG_SCOPE_SYSTEM;
1301         if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0))
1302                 ret += git_config_from_file(fn, git_etc_gitconfig(),
1303                                             data);
1304
1305         current_parsing_scope = CONFIG_SCOPE_GLOBAL;
1306         if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK))
1307                 ret += git_config_from_file(fn, xdg_config, data);
1308
1309         if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK))
1310                 ret += git_config_from_file(fn, user_config, data);
1311
1312         current_parsing_scope = CONFIG_SCOPE_REPO;
1313         if (repo_config && !access_or_die(repo_config, R_OK, 0))
1314                 ret += git_config_from_file(fn, repo_config, data);
1315
1316         current_parsing_scope = CONFIG_SCOPE_CMDLINE;
1317         if (git_config_from_parameters(fn, data) < 0)
1318                 die(_("unable to parse command-line config"));
1319
1320         current_parsing_scope = CONFIG_SCOPE_UNKNOWN;
1321         free(xdg_config);
1322         free(user_config);
1323         free(repo_config);
1324         return ret;
1325 }
1326
1327 int git_config_with_options(config_fn_t fn, void *data,
1328                             struct git_config_source *config_source,
1329                             int respect_includes)
1330 {
1331         struct config_include_data inc = CONFIG_INCLUDE_INIT;
1332
1333         if (respect_includes) {
1334                 inc.fn = fn;
1335                 inc.data = data;
1336                 fn = git_config_include;
1337                 data = &inc;
1338         }
1339
1340         /*
1341          * If we have a specific filename, use it. Otherwise, follow the
1342          * regular lookup sequence.
1343          */
1344         if (config_source && config_source->use_stdin)
1345                 return git_config_from_stdin(fn, data);
1346         else if (config_source && config_source->file)
1347                 return git_config_from_file(fn, config_source->file, data);
1348         else if (config_source && config_source->blob)
1349                 return git_config_from_blob_ref(fn, config_source->blob, data);
1350
1351         return do_git_config_sequence(fn, data);
1352 }
1353
1354 static void git_config_raw(config_fn_t fn, void *data)
1355 {
1356         if (git_config_with_options(fn, data, NULL, 1) < 0)
1357                 /*
1358                  * git_config_with_options() normally returns only
1359                  * zero, as most errors are fatal, and
1360                  * non-fatal potential errors are guarded by "if"
1361                  * statements that are entered only when no error is
1362                  * possible.
1363                  *
1364                  * If we ever encounter a non-fatal error, it means
1365                  * something went really wrong and we should stop
1366                  * immediately.
1367                  */
1368                 die(_("unknown error occurred while reading the configuration files"));
1369 }
1370
1371 static void configset_iter(struct config_set *cs, config_fn_t fn, void *data)
1372 {
1373         int i, value_index;
1374         struct string_list *values;
1375         struct config_set_element *entry;
1376         struct configset_list *list = &cs->list;
1377
1378         for (i = 0; i < list->nr; i++) {
1379                 entry = list->items[i].e;
1380                 value_index = list->items[i].value_index;
1381                 values = &entry->value_list;
1382
1383                 current_config_kvi = values->items[value_index].util;
1384
1385                 if (fn(entry->key, values->items[value_index].string, data) < 0)
1386                         git_die_config_linenr(entry->key,
1387                                               current_config_kvi->filename,
1388                                               current_config_kvi->linenr);
1389
1390                 current_config_kvi = NULL;
1391         }
1392 }
1393
1394 static void git_config_check_init(void);
1395
1396 void git_config(config_fn_t fn, void *data)
1397 {
1398         git_config_check_init();
1399         configset_iter(&the_config_set, fn, data);
1400 }
1401
1402 static struct config_set_element *configset_find_element(struct config_set *cs, const char *key)
1403 {
1404         struct config_set_element k;
1405         struct config_set_element *found_entry;
1406         char *normalized_key;
1407         /*
1408          * `key` may come from the user, so normalize it before using it
1409          * for querying entries from the hashmap.
1410          */
1411         if (git_config_parse_key(key, &normalized_key, NULL))
1412                 return NULL;
1413
1414         hashmap_entry_init(&k, strhash(normalized_key));
1415         k.key = normalized_key;
1416         found_entry = hashmap_get(&cs->config_hash, &k, NULL);
1417         free(normalized_key);
1418         return found_entry;
1419 }
1420
1421 static int configset_add_value(struct config_set *cs, const char *key, const char *value)
1422 {
1423         struct config_set_element *e;
1424         struct string_list_item *si;
1425         struct configset_list_item *l_item;
1426         struct key_value_info *kv_info = xmalloc(sizeof(*kv_info));
1427
1428         e = configset_find_element(cs, key);
1429         /*
1430          * Since the keys are being fed by git_config*() callback mechanism, they
1431          * are already normalized. So simply add them without any further munging.
1432          */
1433         if (!e) {
1434                 e = xmalloc(sizeof(*e));
1435                 hashmap_entry_init(e, strhash(key));
1436                 e->key = xstrdup(key);
1437                 string_list_init(&e->value_list, 1);
1438                 hashmap_add(&cs->config_hash, e);
1439         }
1440         si = string_list_append_nodup(&e->value_list, xstrdup_or_null(value));
1441
1442         ALLOC_GROW(cs->list.items, cs->list.nr + 1, cs->list.alloc);
1443         l_item = &cs->list.items[cs->list.nr++];
1444         l_item->e = e;
1445         l_item->value_index = e->value_list.nr - 1;
1446
1447         if (!cf)
1448                 die("BUG: configset_add_value has no source");
1449         if (cf->name) {
1450                 kv_info->filename = strintern(cf->name);
1451                 kv_info->linenr = cf->linenr;
1452                 kv_info->origin_type = cf->origin_type;
1453         } else {
1454                 /* for values read from `git_config_from_parameters()` */
1455                 kv_info->filename = NULL;
1456                 kv_info->linenr = -1;
1457                 kv_info->origin_type = CONFIG_ORIGIN_CMDLINE;
1458         }
1459         kv_info->scope = current_parsing_scope;
1460         si->util = kv_info;
1461
1462         return 0;
1463 }
1464
1465 static int config_set_element_cmp(const struct config_set_element *e1,
1466                                  const struct config_set_element *e2, const void *unused)
1467 {
1468         return strcmp(e1->key, e2->key);
1469 }
1470
1471 void git_configset_init(struct config_set *cs)
1472 {
1473         hashmap_init(&cs->config_hash, (hashmap_cmp_fn)config_set_element_cmp, 0);
1474         cs->hash_initialized = 1;
1475         cs->list.nr = 0;
1476         cs->list.alloc = 0;
1477         cs->list.items = NULL;
1478 }
1479
1480 void git_configset_clear(struct config_set *cs)
1481 {
1482         struct config_set_element *entry;
1483         struct hashmap_iter iter;
1484         if (!cs->hash_initialized)
1485                 return;
1486
1487         hashmap_iter_init(&cs->config_hash, &iter);
1488         while ((entry = hashmap_iter_next(&iter))) {
1489                 free(entry->key);
1490                 string_list_clear(&entry->value_list, 1);
1491         }
1492         hashmap_free(&cs->config_hash, 1);
1493         cs->hash_initialized = 0;
1494         free(cs->list.items);
1495         cs->list.nr = 0;
1496         cs->list.alloc = 0;
1497         cs->list.items = NULL;
1498 }
1499
1500 static int config_set_callback(const char *key, const char *value, void *cb)
1501 {
1502         struct config_set *cs = cb;
1503         configset_add_value(cs, key, value);
1504         return 0;
1505 }
1506
1507 int git_configset_add_file(struct config_set *cs, const char *filename)
1508 {
1509         return git_config_from_file(config_set_callback, filename, cs);
1510 }
1511
1512 int git_configset_get_value(struct config_set *cs, const char *key, const char **value)
1513 {
1514         const struct string_list *values = NULL;
1515         /*
1516          * Follows "last one wins" semantic, i.e., if there are multiple matches for the
1517          * queried key in the files of the configset, the value returned will be the last
1518          * value in the value list for that key.
1519          */
1520         values = git_configset_get_value_multi(cs, key);
1521
1522         if (!values)
1523                 return 1;
1524         assert(values->nr > 0);
1525         *value = values->items[values->nr - 1].string;
1526         return 0;
1527 }
1528
1529 const struct string_list *git_configset_get_value_multi(struct config_set *cs, const char *key)
1530 {
1531         struct config_set_element *e = configset_find_element(cs, key);
1532         return e ? &e->value_list : NULL;
1533 }
1534
1535 int git_configset_get_string_const(struct config_set *cs, const char *key, const char **dest)
1536 {
1537         const char *value;
1538         if (!git_configset_get_value(cs, key, &value))
1539                 return git_config_string(dest, key, value);
1540         else
1541                 return 1;
1542 }
1543
1544 int git_configset_get_string(struct config_set *cs, const char *key, char **dest)
1545 {
1546         return git_configset_get_string_const(cs, key, (const char **)dest);
1547 }
1548
1549 int git_configset_get_int(struct config_set *cs, const char *key, int *dest)
1550 {
1551         const char *value;
1552         if (!git_configset_get_value(cs, key, &value)) {
1553                 *dest = git_config_int(key, value);
1554                 return 0;
1555         } else
1556                 return 1;
1557 }
1558
1559 int git_configset_get_ulong(struct config_set *cs, const char *key, unsigned long *dest)
1560 {
1561         const char *value;
1562         if (!git_configset_get_value(cs, key, &value)) {
1563                 *dest = git_config_ulong(key, value);
1564                 return 0;
1565         } else
1566                 return 1;
1567 }
1568
1569 int git_configset_get_bool(struct config_set *cs, const char *key, int *dest)
1570 {
1571         const char *value;
1572         if (!git_configset_get_value(cs, key, &value)) {
1573                 *dest = git_config_bool(key, value);
1574                 return 0;
1575         } else
1576                 return 1;
1577 }
1578
1579 int git_configset_get_bool_or_int(struct config_set *cs, const char *key,
1580                                 int *is_bool, int *dest)
1581 {
1582         const char *value;
1583         if (!git_configset_get_value(cs, key, &value)) {
1584                 *dest = git_config_bool_or_int(key, value, is_bool);
1585                 return 0;
1586         } else
1587                 return 1;
1588 }
1589
1590 int git_configset_get_maybe_bool(struct config_set *cs, const char *key, int *dest)
1591 {
1592         const char *value;
1593         if (!git_configset_get_value(cs, key, &value)) {
1594                 *dest = git_config_maybe_bool(key, value);
1595                 if (*dest == -1)
1596                         return -1;
1597                 return 0;
1598         } else
1599                 return 1;
1600 }
1601
1602 int git_configset_get_pathname(struct config_set *cs, const char *key, const char **dest)
1603 {
1604         const char *value;
1605         if (!git_configset_get_value(cs, key, &value))
1606                 return git_config_pathname(dest, key, value);
1607         else
1608                 return 1;
1609 }
1610
1611 static void git_config_check_init(void)
1612 {
1613         if (the_config_set.hash_initialized)
1614                 return;
1615         git_configset_init(&the_config_set);
1616         git_config_raw(config_set_callback, &the_config_set);
1617 }
1618
1619 void git_config_clear(void)
1620 {
1621         if (!the_config_set.hash_initialized)
1622                 return;
1623         git_configset_clear(&the_config_set);
1624 }
1625
1626 int git_config_get_value(const char *key, const char **value)
1627 {
1628         git_config_check_init();
1629         return git_configset_get_value(&the_config_set, key, value);
1630 }
1631
1632 const struct string_list *git_config_get_value_multi(const char *key)
1633 {
1634         git_config_check_init();
1635         return git_configset_get_value_multi(&the_config_set, key);
1636 }
1637
1638 int git_config_get_string_const(const char *key, const char **dest)
1639 {
1640         int ret;
1641         git_config_check_init();
1642         ret = git_configset_get_string_const(&the_config_set, key, dest);
1643         if (ret < 0)
1644                 git_die_config(key, NULL);
1645         return ret;
1646 }
1647
1648 int git_config_get_string(const char *key, char **dest)
1649 {
1650         git_config_check_init();
1651         return git_config_get_string_const(key, (const char **)dest);
1652 }
1653
1654 int git_config_get_int(const char *key, int *dest)
1655 {
1656         git_config_check_init();
1657         return git_configset_get_int(&the_config_set, key, dest);
1658 }
1659
1660 int git_config_get_ulong(const char *key, unsigned long *dest)
1661 {
1662         git_config_check_init();
1663         return git_configset_get_ulong(&the_config_set, key, dest);
1664 }
1665
1666 int git_config_get_bool(const char *key, int *dest)
1667 {
1668         git_config_check_init();
1669         return git_configset_get_bool(&the_config_set, key, dest);
1670 }
1671
1672 int git_config_get_bool_or_int(const char *key, int *is_bool, int *dest)
1673 {
1674         git_config_check_init();
1675         return git_configset_get_bool_or_int(&the_config_set, key, is_bool, dest);
1676 }
1677
1678 int git_config_get_maybe_bool(const char *key, int *dest)
1679 {
1680         git_config_check_init();
1681         return git_configset_get_maybe_bool(&the_config_set, key, dest);
1682 }
1683
1684 int git_config_get_pathname(const char *key, const char **dest)
1685 {
1686         int ret;
1687         git_config_check_init();
1688         ret = git_configset_get_pathname(&the_config_set, key, dest);
1689         if (ret < 0)
1690                 git_die_config(key, NULL);
1691         return ret;
1692 }
1693
1694 int git_config_get_untracked_cache(void)
1695 {
1696         int val = -1;
1697         const char *v;
1698
1699         /* Hack for test programs like test-dump-untracked-cache */
1700         if (ignore_untracked_cache_config)
1701                 return -1;
1702
1703         if (!git_config_get_maybe_bool("core.untrackedcache", &val))
1704                 return val;
1705
1706         if (!git_config_get_value("core.untrackedcache", &v)) {
1707                 if (!strcasecmp(v, "keep"))
1708                         return -1;
1709
1710                 error("unknown core.untrackedCache value '%s'; "
1711                       "using 'keep' default value", v);
1712                 return -1;
1713         }
1714
1715         return -1; /* default value */
1716 }
1717
1718 NORETURN
1719 void git_die_config_linenr(const char *key, const char *filename, int linenr)
1720 {
1721         if (!filename)
1722                 die(_("unable to parse '%s' from command-line config"), key);
1723         else
1724                 die(_("bad config variable '%s' in file '%s' at line %d"),
1725                     key, filename, linenr);
1726 }
1727
1728 NORETURN __attribute__((format(printf, 2, 3)))
1729 void git_die_config(const char *key, const char *err, ...)
1730 {
1731         const struct string_list *values;
1732         struct key_value_info *kv_info;
1733
1734         if (err) {
1735                 va_list params;
1736                 va_start(params, err);
1737                 vreportf("error: ", err, params);
1738                 va_end(params);
1739         }
1740         values = git_config_get_value_multi(key);
1741         kv_info = values->items[values->nr - 1].util;
1742         git_die_config_linenr(key, kv_info->filename, kv_info->linenr);
1743 }
1744
1745 /*
1746  * Find all the stuff for git_config_set() below.
1747  */
1748
1749 static struct {
1750         int baselen;
1751         char *key;
1752         int do_not_match;
1753         regex_t *value_regex;
1754         int multi_replace;
1755         size_t *offset;
1756         unsigned int offset_alloc;
1757         enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1758         int seen;
1759 } store;
1760
1761 static int matches(const char *key, const char *value)
1762 {
1763         if (strcmp(key, store.key))
1764                 return 0; /* not ours */
1765         if (!store.value_regex)
1766                 return 1; /* always matches */
1767         if (store.value_regex == CONFIG_REGEX_NONE)
1768                 return 0; /* never matches */
1769
1770         return store.do_not_match ^
1771                 (value && !regexec(store.value_regex, value, 0, NULL, 0));
1772 }
1773
1774 static int store_aux(const char *key, const char *value, void *cb)
1775 {
1776         const char *ep;
1777         size_t section_len;
1778
1779         switch (store.state) {
1780         case KEY_SEEN:
1781                 if (matches(key, value)) {
1782                         if (store.seen == 1 && store.multi_replace == 0) {
1783                                 warning(_("%s has multiple values"), key);
1784                         }
1785
1786                         ALLOC_GROW(store.offset, store.seen + 1,
1787                                    store.offset_alloc);
1788
1789                         store.offset[store.seen] = cf->do_ftell(cf);
1790                         store.seen++;
1791                 }
1792                 break;
1793         case SECTION_SEEN:
1794                 /*
1795                  * What we are looking for is in store.key (both
1796                  * section and var), and its section part is baselen
1797                  * long.  We found key (again, both section and var).
1798                  * We would want to know if this key is in the same
1799                  * section as what we are looking for.  We already
1800                  * know we are in the same section as what should
1801                  * hold store.key.
1802                  */
1803                 ep = strrchr(key, '.');
1804                 section_len = ep - key;
1805
1806                 if ((section_len != store.baselen) ||
1807                     memcmp(key, store.key, section_len+1)) {
1808                         store.state = SECTION_END_SEEN;
1809                         break;
1810                 }
1811
1812                 /*
1813                  * Do not increment matches: this is no match, but we
1814                  * just made sure we are in the desired section.
1815                  */
1816                 ALLOC_GROW(store.offset, store.seen + 1,
1817                            store.offset_alloc);
1818                 store.offset[store.seen] = cf->do_ftell(cf);
1819                 /* fallthru */
1820         case SECTION_END_SEEN:
1821         case START:
1822                 if (matches(key, value)) {
1823                         ALLOC_GROW(store.offset, store.seen + 1,
1824                                    store.offset_alloc);
1825                         store.offset[store.seen] = cf->do_ftell(cf);
1826                         store.state = KEY_SEEN;
1827                         store.seen++;
1828                 } else {
1829                         if (strrchr(key, '.') - key == store.baselen &&
1830                               !strncmp(key, store.key, store.baselen)) {
1831                                         store.state = SECTION_SEEN;
1832                                         ALLOC_GROW(store.offset,
1833                                                    store.seen + 1,
1834                                                    store.offset_alloc);
1835                                         store.offset[store.seen] = cf->do_ftell(cf);
1836                         }
1837                 }
1838         }
1839         return 0;
1840 }
1841
1842 static int write_error(const char *filename)
1843 {
1844         error("failed to write new configuration file %s", filename);
1845
1846         /* Same error code as "failed to rename". */
1847         return 4;
1848 }
1849
1850 static int store_write_section(int fd, const char *key)
1851 {
1852         const char *dot;
1853         int i, success;
1854         struct strbuf sb = STRBUF_INIT;
1855
1856         dot = memchr(key, '.', store.baselen);
1857         if (dot) {
1858                 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1859                 for (i = dot - key + 1; i < store.baselen; i++) {
1860                         if (key[i] == '"' || key[i] == '\\')
1861                                 strbuf_addch(&sb, '\\');
1862                         strbuf_addch(&sb, key[i]);
1863                 }
1864                 strbuf_addstr(&sb, "\"]\n");
1865         } else {
1866                 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1867         }
1868
1869         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1870         strbuf_release(&sb);
1871
1872         return success;
1873 }
1874
1875 static int store_write_pair(int fd, const char *key, const char *value)
1876 {
1877         int i, success;
1878         int length = strlen(key + store.baselen + 1);
1879         const char *quote = "";
1880         struct strbuf sb = STRBUF_INIT;
1881
1882         /*
1883          * Check to see if the value needs to be surrounded with a dq pair.
1884          * Note that problematic characters are always backslash-quoted; this
1885          * check is about not losing leading or trailing SP and strings that
1886          * follow beginning-of-comment characters (i.e. ';' and '#') by the
1887          * configuration parser.
1888          */
1889         if (value[0] == ' ')
1890                 quote = "\"";
1891         for (i = 0; value[i]; i++)
1892                 if (value[i] == ';' || value[i] == '#')
1893                         quote = "\"";
1894         if (i && value[i - 1] == ' ')
1895                 quote = "\"";
1896
1897         strbuf_addf(&sb, "\t%.*s = %s",
1898                     length, key + store.baselen + 1, quote);
1899
1900         for (i = 0; value[i]; i++)
1901                 switch (value[i]) {
1902                 case '\n':
1903                         strbuf_addstr(&sb, "\\n");
1904                         break;
1905                 case '\t':
1906                         strbuf_addstr(&sb, "\\t");
1907                         break;
1908                 case '"':
1909                 case '\\':
1910                         strbuf_addch(&sb, '\\');
1911                 default:
1912                         strbuf_addch(&sb, value[i]);
1913                         break;
1914                 }
1915         strbuf_addf(&sb, "%s\n", quote);
1916
1917         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1918         strbuf_release(&sb);
1919
1920         return success;
1921 }
1922
1923 static ssize_t find_beginning_of_line(const char *contents, size_t size,
1924         size_t offset_, int *found_bracket)
1925 {
1926         size_t equal_offset = size, bracket_offset = size;
1927         ssize_t offset;
1928
1929 contline:
1930         for (offset = offset_-2; offset > 0
1931                         && contents[offset] != '\n'; offset--)
1932                 switch (contents[offset]) {
1933                         case '=': equal_offset = offset; break;
1934                         case ']': bracket_offset = offset; break;
1935                 }
1936         if (offset > 0 && contents[offset-1] == '\\') {
1937                 offset_ = offset;
1938                 goto contline;
1939         }
1940         if (bracket_offset < equal_offset) {
1941                 *found_bracket = 1;
1942                 offset = bracket_offset+1;
1943         } else
1944                 offset++;
1945
1946         return offset;
1947 }
1948
1949 int git_config_set_in_file_gently(const char *config_filename,
1950                                   const char *key, const char *value)
1951 {
1952         return git_config_set_multivar_in_file_gently(config_filename, key, value, NULL, 0);
1953 }
1954
1955 void git_config_set_in_file(const char *config_filename,
1956                             const char *key, const char *value)
1957 {
1958         git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1959 }
1960
1961 int git_config_set_gently(const char *key, const char *value)
1962 {
1963         return git_config_set_multivar_gently(key, value, NULL, 0);
1964 }
1965
1966 void git_config_set(const char *key, const char *value)
1967 {
1968         git_config_set_multivar(key, value, NULL, 0);
1969 }
1970
1971 /*
1972  * Auxiliary function to sanity-check and split the key into the section
1973  * identifier and variable name.
1974  *
1975  * Returns 0 on success, -1 when there is an invalid character in the key and
1976  * -2 if there is no section name in the key.
1977  *
1978  * store_key - pointer to char* which will hold a copy of the key with
1979  *             lowercase section and variable name
1980  * baselen - pointer to int which will hold the length of the
1981  *           section + subsection part, can be NULL
1982  */
1983 static int git_config_parse_key_1(const char *key, char **store_key, int *baselen_, int quiet)
1984 {
1985         int i, dot, baselen;
1986         const char *last_dot = strrchr(key, '.');
1987
1988         /*
1989          * Since "key" actually contains the section name and the real
1990          * key name separated by a dot, we have to know where the dot is.
1991          */
1992
1993         if (last_dot == NULL || last_dot == key) {
1994                 if (!quiet)
1995                         error("key does not contain a section: %s", key);
1996                 return -CONFIG_NO_SECTION_OR_NAME;
1997         }
1998
1999         if (!last_dot[1]) {
2000                 if (!quiet)
2001                         error("key does not contain variable name: %s", key);
2002                 return -CONFIG_NO_SECTION_OR_NAME;
2003         }
2004
2005         baselen = last_dot - key;
2006         if (baselen_)
2007                 *baselen_ = baselen;
2008
2009         /*
2010          * Validate the key and while at it, lower case it for matching.
2011          */
2012         if (store_key)
2013                 *store_key = xmallocz(strlen(key));
2014
2015         dot = 0;
2016         for (i = 0; key[i]; i++) {
2017                 unsigned char c = key[i];
2018                 if (c == '.')
2019                         dot = 1;
2020                 /* Leave the extended basename untouched.. */
2021                 if (!dot || i > baselen) {
2022                         if (!iskeychar(c) ||
2023                             (i == baselen + 1 && !isalpha(c))) {
2024                                 if (!quiet)
2025                                         error("invalid key: %s", key);
2026                                 goto out_free_ret_1;
2027                         }
2028                         c = tolower(c);
2029                 } else if (c == '\n') {
2030                         if (!quiet)
2031                                 error("invalid key (newline): %s", key);
2032                         goto out_free_ret_1;
2033                 }
2034                 if (store_key)
2035                         (*store_key)[i] = c;
2036         }
2037
2038         return 0;
2039
2040 out_free_ret_1:
2041         if (store_key) {
2042                 free(*store_key);
2043                 *store_key = NULL;
2044         }
2045         return -CONFIG_INVALID_KEY;
2046 }
2047
2048 int git_config_parse_key(const char *key, char **store_key, int *baselen)
2049 {
2050         return git_config_parse_key_1(key, store_key, baselen, 0);
2051 }
2052
2053 int git_config_key_is_valid(const char *key)
2054 {
2055         return !git_config_parse_key_1(key, NULL, NULL, 1);
2056 }
2057
2058 /*
2059  * If value==NULL, unset in (remove from) config,
2060  * if value_regex!=NULL, disregard key/value pairs where value does not match.
2061  * if value_regex==CONFIG_REGEX_NONE, do not match any existing values
2062  *     (only add a new one)
2063  * if multi_replace==0, nothing, or only one matching key/value is replaced,
2064  *     else all matching key/values (regardless how many) are removed,
2065  *     before the new pair is written.
2066  *
2067  * Returns 0 on success.
2068  *
2069  * This function does this:
2070  *
2071  * - it locks the config file by creating ".git/config.lock"
2072  *
2073  * - it then parses the config using store_aux() as validator to find
2074  *   the position on the key/value pair to replace. If it is to be unset,
2075  *   it must be found exactly once.
2076  *
2077  * - the config file is mmap()ed and the part before the match (if any) is
2078  *   written to the lock file, then the changed part and the rest.
2079  *
2080  * - the config file is removed and the lock file rename()d to it.
2081  *
2082  */
2083 int git_config_set_multivar_in_file_gently(const char *config_filename,
2084                                            const char *key, const char *value,
2085                                            const char *value_regex,
2086                                            int multi_replace)
2087 {
2088         int fd = -1, in_fd = -1;
2089         int ret;
2090         struct lock_file *lock = NULL;
2091         char *filename_buf = NULL;
2092         char *contents = NULL;
2093         size_t contents_sz;
2094
2095         /* parse-key returns negative; flip the sign to feed exit(3) */
2096         ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
2097         if (ret)
2098                 goto out_free;
2099
2100         store.multi_replace = multi_replace;
2101
2102         if (!config_filename)
2103                 config_filename = filename_buf = git_pathdup("config");
2104
2105         /*
2106          * The lock serves a purpose in addition to locking: the new
2107          * contents of .git/config will be written into it.
2108          */
2109         lock = xcalloc(1, sizeof(struct lock_file));
2110         fd = hold_lock_file_for_update(lock, config_filename, 0);
2111         if (fd < 0) {
2112                 error_errno("could not lock config file %s", config_filename);
2113                 free(store.key);
2114                 ret = CONFIG_NO_LOCK;
2115                 goto out_free;
2116         }
2117
2118         /*
2119          * If .git/config does not exist yet, write a minimal version.
2120          */
2121         in_fd = open(config_filename, O_RDONLY);
2122         if ( in_fd < 0 ) {
2123                 free(store.key);
2124
2125                 if ( ENOENT != errno ) {
2126                         error_errno("opening %s", config_filename);
2127                         ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
2128                         goto out_free;
2129                 }
2130                 /* if nothing to unset, error out */
2131                 if (value == NULL) {
2132                         ret = CONFIG_NOTHING_SET;
2133                         goto out_free;
2134                 }
2135
2136                 store.key = (char *)key;
2137                 if (!store_write_section(fd, key) ||
2138                     !store_write_pair(fd, key, value))
2139                         goto write_err_out;
2140         } else {
2141                 struct stat st;
2142                 size_t copy_begin, copy_end;
2143                 int i, new_line = 0;
2144
2145                 if (value_regex == NULL)
2146                         store.value_regex = NULL;
2147                 else if (value_regex == CONFIG_REGEX_NONE)
2148                         store.value_regex = CONFIG_REGEX_NONE;
2149                 else {
2150                         if (value_regex[0] == '!') {
2151                                 store.do_not_match = 1;
2152                                 value_regex++;
2153                         } else
2154                                 store.do_not_match = 0;
2155
2156                         store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
2157                         if (regcomp(store.value_regex, value_regex,
2158                                         REG_EXTENDED)) {
2159                                 error("invalid pattern: %s", value_regex);
2160                                 free(store.value_regex);
2161                                 ret = CONFIG_INVALID_PATTERN;
2162                                 goto out_free;
2163                         }
2164                 }
2165
2166                 ALLOC_GROW(store.offset, 1, store.offset_alloc);
2167                 store.offset[0] = 0;
2168                 store.state = START;
2169                 store.seen = 0;
2170
2171                 /*
2172                  * After this, store.offset will contain the *end* offset
2173                  * of the last match, or remain at 0 if no match was found.
2174                  * As a side effect, we make sure to transform only a valid
2175                  * existing config file.
2176                  */
2177                 if (git_config_from_file(store_aux, config_filename, NULL)) {
2178                         error("invalid config file %s", config_filename);
2179                         free(store.key);
2180                         if (store.value_regex != NULL &&
2181                             store.value_regex != CONFIG_REGEX_NONE) {
2182                                 regfree(store.value_regex);
2183                                 free(store.value_regex);
2184                         }
2185                         ret = CONFIG_INVALID_FILE;
2186                         goto out_free;
2187                 }
2188
2189                 free(store.key);
2190                 if (store.value_regex != NULL &&
2191                     store.value_regex != CONFIG_REGEX_NONE) {
2192                         regfree(store.value_regex);
2193                         free(store.value_regex);
2194                 }
2195
2196                 /* if nothing to unset, or too many matches, error out */
2197                 if ((store.seen == 0 && value == NULL) ||
2198                                 (store.seen > 1 && multi_replace == 0)) {
2199                         ret = CONFIG_NOTHING_SET;
2200                         goto out_free;
2201                 }
2202
2203                 fstat(in_fd, &st);
2204                 contents_sz = xsize_t(st.st_size);
2205                 contents = xmmap_gently(NULL, contents_sz, PROT_READ,
2206                                         MAP_PRIVATE, in_fd, 0);
2207                 if (contents == MAP_FAILED) {
2208                         if (errno == ENODEV && S_ISDIR(st.st_mode))
2209                                 errno = EISDIR;
2210                         error_errno("unable to mmap '%s'", config_filename);
2211                         ret = CONFIG_INVALID_FILE;
2212                         contents = NULL;
2213                         goto out_free;
2214                 }
2215                 close(in_fd);
2216                 in_fd = -1;
2217
2218                 if (chmod(get_lock_file_path(lock), st.st_mode & 07777) < 0) {
2219                         error_errno("chmod on %s failed", get_lock_file_path(lock));
2220                         ret = CONFIG_NO_WRITE;
2221                         goto out_free;
2222                 }
2223
2224                 if (store.seen == 0)
2225                         store.seen = 1;
2226
2227                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
2228                         if (store.offset[i] == 0) {
2229                                 store.offset[i] = copy_end = contents_sz;
2230                         } else if (store.state != KEY_SEEN) {
2231                                 copy_end = store.offset[i];
2232                         } else
2233                                 copy_end = find_beginning_of_line(
2234                                         contents, contents_sz,
2235                                         store.offset[i]-2, &new_line);
2236
2237                         if (copy_end > 0 && contents[copy_end-1] != '\n')
2238                                 new_line = 1;
2239
2240                         /* write the first part of the config */
2241                         if (copy_end > copy_begin) {
2242                                 if (write_in_full(fd, contents + copy_begin,
2243                                                   copy_end - copy_begin) <
2244                                     copy_end - copy_begin)
2245                                         goto write_err_out;
2246                                 if (new_line &&
2247                                     write_str_in_full(fd, "\n") != 1)
2248                                         goto write_err_out;
2249                         }
2250                         copy_begin = store.offset[i];
2251                 }
2252
2253                 /* write the pair (value == NULL means unset) */
2254                 if (value != NULL) {
2255                         if (store.state == START) {
2256                                 if (!store_write_section(fd, key))
2257                                         goto write_err_out;
2258                         }
2259                         if (!store_write_pair(fd, key, value))
2260                                 goto write_err_out;
2261                 }
2262
2263                 /* write the rest of the config */
2264                 if (copy_begin < contents_sz)
2265                         if (write_in_full(fd, contents + copy_begin,
2266                                           contents_sz - copy_begin) <
2267                             contents_sz - copy_begin)
2268                                 goto write_err_out;
2269
2270                 munmap(contents, contents_sz);
2271                 contents = NULL;
2272         }
2273
2274         if (commit_lock_file(lock) < 0) {
2275                 error_errno("could not write config file %s", config_filename);
2276                 ret = CONFIG_NO_WRITE;
2277                 lock = NULL;
2278                 goto out_free;
2279         }
2280
2281         /*
2282          * lock is committed, so don't try to roll it back below.
2283          * NOTE: Since lockfile.c keeps a linked list of all created
2284          * lock_file structures, it isn't safe to free(lock).  It's
2285          * better to just leave it hanging around.
2286          */
2287         lock = NULL;
2288         ret = 0;
2289
2290         /* Invalidate the config cache */
2291         git_config_clear();
2292
2293 out_free:
2294         if (lock)
2295                 rollback_lock_file(lock);
2296         free(filename_buf);
2297         if (contents)
2298                 munmap(contents, contents_sz);
2299         if (in_fd >= 0)
2300                 close(in_fd);
2301         return ret;
2302
2303 write_err_out:
2304         ret = write_error(get_lock_file_path(lock));
2305         goto out_free;
2306
2307 }
2308
2309 void git_config_set_multivar_in_file(const char *config_filename,
2310                                      const char *key, const char *value,
2311                                      const char *value_regex, int multi_replace)
2312 {
2313         if (!git_config_set_multivar_in_file_gently(config_filename, key, value,
2314                                                     value_regex, multi_replace))
2315                 return;
2316         if (value)
2317                 die(_("could not set '%s' to '%s'"), key, value);
2318         else
2319                 die(_("could not unset '%s'"), key);
2320 }
2321
2322 int git_config_set_multivar_gently(const char *key, const char *value,
2323                                    const char *value_regex, int multi_replace)
2324 {
2325         return git_config_set_multivar_in_file_gently(NULL, key, value, value_regex,
2326                                                       multi_replace);
2327 }
2328
2329 void git_config_set_multivar(const char *key, const char *value,
2330                              const char *value_regex, int multi_replace)
2331 {
2332         git_config_set_multivar_in_file(NULL, key, value, value_regex,
2333                                         multi_replace);
2334 }
2335
2336 static int section_name_match (const char *buf, const char *name)
2337 {
2338         int i = 0, j = 0, dot = 0;
2339         if (buf[i] != '[')
2340                 return 0;
2341         for (i = 1; buf[i] && buf[i] != ']'; i++) {
2342                 if (!dot && isspace(buf[i])) {
2343                         dot = 1;
2344                         if (name[j++] != '.')
2345                                 break;
2346                         for (i++; isspace(buf[i]); i++)
2347                                 ; /* do nothing */
2348                         if (buf[i] != '"')
2349                                 break;
2350                         continue;
2351                 }
2352                 if (buf[i] == '\\' && dot)
2353                         i++;
2354                 else if (buf[i] == '"' && dot) {
2355                         for (i++; isspace(buf[i]); i++)
2356                                 ; /* do_nothing */
2357                         break;
2358                 }
2359                 if (buf[i] != name[j++])
2360                         break;
2361         }
2362         if (buf[i] == ']' && name[j] == 0) {
2363                 /*
2364                  * We match, now just find the right length offset by
2365                  * gobbling up any whitespace after it, as well
2366                  */
2367                 i++;
2368                 for (; buf[i] && isspace(buf[i]); i++)
2369                         ; /* do nothing */
2370                 return i;
2371         }
2372         return 0;
2373 }
2374
2375 static int section_name_is_ok(const char *name)
2376 {
2377         /* Empty section names are bogus. */
2378         if (!*name)
2379                 return 0;
2380
2381         /*
2382          * Before a dot, we must be alphanumeric or dash. After the first dot,
2383          * anything goes, so we can stop checking.
2384          */
2385         for (; *name && *name != '.'; name++)
2386                 if (*name != '-' && !isalnum(*name))
2387                         return 0;
2388         return 1;
2389 }
2390
2391 /* if new_name == NULL, the section is removed instead */
2392 int git_config_rename_section_in_file(const char *config_filename,
2393                                       const char *old_name, const char *new_name)
2394 {
2395         int ret = 0, remove = 0;
2396         char *filename_buf = NULL;
2397         struct lock_file *lock;
2398         int out_fd;
2399         char buf[1024];
2400         FILE *config_file;
2401         struct stat st;
2402
2403         if (new_name && !section_name_is_ok(new_name)) {
2404                 ret = error("invalid section name: %s", new_name);
2405                 goto out;
2406         }
2407
2408         if (!config_filename)
2409                 config_filename = filename_buf = git_pathdup("config");
2410
2411         lock = xcalloc(1, sizeof(struct lock_file));
2412         out_fd = hold_lock_file_for_update(lock, config_filename, 0);
2413         if (out_fd < 0) {
2414                 ret = error("could not lock config file %s", config_filename);
2415                 goto out;
2416         }
2417
2418         if (!(config_file = fopen(config_filename, "rb"))) {
2419                 /* no config file means nothing to rename, no error */
2420                 goto unlock_and_out;
2421         }
2422
2423         fstat(fileno(config_file), &st);
2424
2425         if (chmod(get_lock_file_path(lock), st.st_mode & 07777) < 0) {
2426                 ret = error_errno("chmod on %s failed",
2427                                   get_lock_file_path(lock));
2428                 goto out;
2429         }
2430
2431         while (fgets(buf, sizeof(buf), config_file)) {
2432                 int i;
2433                 int length;
2434                 char *output = buf;
2435                 for (i = 0; buf[i] && isspace(buf[i]); i++)
2436                         ; /* do nothing */
2437                 if (buf[i] == '[') {
2438                         /* it's a section */
2439                         int offset = section_name_match(&buf[i], old_name);
2440                         if (offset > 0) {
2441                                 ret++;
2442                                 if (new_name == NULL) {
2443                                         remove = 1;
2444                                         continue;
2445                                 }
2446                                 store.baselen = strlen(new_name);
2447                                 if (!store_write_section(out_fd, new_name)) {
2448                                         ret = write_error(get_lock_file_path(lock));
2449                                         goto out;
2450                                 }
2451                                 /*
2452                                  * We wrote out the new section, with
2453                                  * a newline, now skip the old
2454                                  * section's length
2455                                  */
2456                                 output += offset + i;
2457                                 if (strlen(output) > 0) {
2458                                         /*
2459                                          * More content means there's
2460                                          * a declaration to put on the
2461                                          * next line; indent with a
2462                                          * tab
2463                                          */
2464                                         output -= 1;
2465                                         output[0] = '\t';
2466                                 }
2467                         }
2468                         remove = 0;
2469                 }
2470                 if (remove)
2471                         continue;
2472                 length = strlen(output);
2473                 if (write_in_full(out_fd, output, length) != length) {
2474                         ret = write_error(get_lock_file_path(lock));
2475                         goto out;
2476                 }
2477         }
2478         fclose(config_file);
2479 unlock_and_out:
2480         if (commit_lock_file(lock) < 0)
2481                 ret = error_errno("could not write config file %s",
2482                                   config_filename);
2483 out:
2484         free(filename_buf);
2485         return ret;
2486 }
2487
2488 int git_config_rename_section(const char *old_name, const char *new_name)
2489 {
2490         return git_config_rename_section_in_file(NULL, old_name, new_name);
2491 }
2492
2493 /*
2494  * Call this to report error for your variable that should not
2495  * get a boolean value (i.e. "[my] var" means "true").
2496  */
2497 #undef config_error_nonbool
2498 int config_error_nonbool(const char *var)
2499 {
2500         return error("missing value for '%s'", var);
2501 }
2502
2503 int parse_config_key(const char *var,
2504                      const char *section,
2505                      const char **subsection, int *subsection_len,
2506                      const char **key)
2507 {
2508         int section_len = strlen(section);
2509         const char *dot;
2510
2511         /* Does it start with "section." ? */
2512         if (!starts_with(var, section) || var[section_len] != '.')
2513                 return -1;
2514
2515         /*
2516          * Find the key; we don't know yet if we have a subsection, but we must
2517          * parse backwards from the end, since the subsection may have dots in
2518          * it, too.
2519          */
2520         dot = strrchr(var, '.');
2521         *key = dot + 1;
2522
2523         /* Did we have a subsection at all? */
2524         if (dot == var + section_len) {
2525                 *subsection = NULL;
2526                 *subsection_len = 0;
2527         }
2528         else {
2529                 *subsection = var + section_len + 1;
2530                 *subsection_len = dot - *subsection;
2531         }
2532
2533         return 0;
2534 }
2535
2536 const char *current_config_origin_type(void)
2537 {
2538         int type;
2539         if (current_config_kvi)
2540                 type = current_config_kvi->origin_type;
2541         else if(cf)
2542                 type = cf->origin_type;
2543         else
2544                 die("BUG: current_config_origin_type called outside config callback");
2545
2546         switch (type) {
2547         case CONFIG_ORIGIN_BLOB:
2548                 return "blob";
2549         case CONFIG_ORIGIN_FILE:
2550                 return "file";
2551         case CONFIG_ORIGIN_STDIN:
2552                 return "standard input";
2553         case CONFIG_ORIGIN_SUBMODULE_BLOB:
2554                 return "submodule-blob";
2555         case CONFIG_ORIGIN_CMDLINE:
2556                 return "command line";
2557         default:
2558                 die("BUG: unknown config origin type");
2559         }
2560 }
2561
2562 const char *current_config_name(void)
2563 {
2564         const char *name;
2565         if (current_config_kvi)
2566                 name = current_config_kvi->filename;
2567         else if (cf)
2568                 name = cf->name;
2569         else
2570                 die("BUG: current_config_name called outside config callback");
2571         return name ? name : "";
2572 }
2573
2574 enum config_scope current_config_scope(void)
2575 {
2576         if (current_config_kvi)
2577                 return current_config_kvi->scope;
2578         else
2579                 return current_parsing_scope;
2580 }