config.c

   1 /*
   2  * GIT - The information manager from hell
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  * Copyright (C) Johannes Schindelin, 2005
   6  *
   7  */
   8 #include "cache.h"
   9 #include "exec_cmd.h"
  10 #include "strbuf.h"
  11 #include "quote.h"
  12
  13 struct config_source {
  14         struct config_source *prev;
  15         union {
  16                 FILE *file;
  17                 struct config_buf {
  18                         const char *buf;
  19                         size_t len;
  20                         size_t pos;
  21                 } buf;
  22         } u;
  23         const char *name;
  24         const char *path;
  25         int die_on_error;
  26         int linenr;
  27         int eof;
  28         struct strbuf value;
  29         struct strbuf var;
  30
  31         int (*do_fgetc)(struct config_source *c);
  32         int (*do_ungetc)(int c, struct config_source *conf);
  33         long (*do_ftell)(struct config_source *c);
  34 };
  35
  36 static struct config_source *cf;
  37
  38 static int zlib_compression_seen;
  39
  40 static int config_file_fgetc(struct config_source *conf)
  41 {
  42         return fgetc(conf->u.file);
  43 }
  44
  45 static int config_file_ungetc(int c, struct config_source *conf)
  46 {
  47         return ungetc(c, conf->u.file);
  48 }
  49
  50 static long config_file_ftell(struct config_source *conf)
  51 {
  52         return ftell(conf->u.file);
  53 }
  54
  55
  56 static int config_buf_fgetc(struct config_source *conf)
  57 {
  58         if (conf->u.buf.pos < conf->u.buf.len)
  59                 return conf->u.buf.buf[conf->u.buf.pos++];
  60
  61         return EOF;
  62 }
  63
  64 static int config_buf_ungetc(int c, struct config_source *conf)
  65 {
  66         if (conf->u.buf.pos > 0)
  67                 return conf->u.buf.buf[--conf->u.buf.pos];
  68
  69         return EOF;
  70 }
  71
  72 static long config_buf_ftell(struct config_source *conf)
  73 {
  74         return conf->u.buf.pos;
  75 }
  76
  77 #define MAX_INCLUDE_DEPTH 10
  78 static const char include_depth_advice[] =
  79 "exceeded maximum include depth (%d) while including\n"
  80 "       %s\n"
  81 "from\n"
  82 "       %s\n"
  83 "Do you have circular includes?";
  84 static int handle_path_include(const char *path, struct config_include_data *inc)
  85 {
  86         int ret = 0;
  87         struct strbuf buf = STRBUF_INIT;
  88         char *expanded = expand_user_path(path);
  89
  90         if (!expanded)
  91                 return error("Could not expand include path '%s'", path);
  92         path = expanded;
  93
  94         /*
  95          * Use an absolute path as-is, but interpret relative paths
  96          * based on the including config file.
  97          */
  98         if (!is_absolute_path(path)) {
  99                 char *slash;
 100
 101                 if (!cf || !cf->path)
 102                         return error("relative config includes must come from files");
 103
 104                 slash = find_last_dir_sep(cf->path);
 105                 if (slash)
 106                         strbuf_add(&buf, cf->path, slash - cf->path + 1);
 107                 strbuf_addstr(&buf, path);
 108                 path = buf.buf;
 109         }
 110
 111         if (!access_or_die(path, R_OK, 0)) {
 112                 if (++inc->depth > MAX_INCLUDE_DEPTH)
 113                         die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
 114                             cf && cf->name ? cf->name : "the command line");
 115                 ret = git_config_from_file(git_config_include, path, inc);
 116                 inc->depth--;
 117         }
 118         strbuf_release(&buf);
 119         free(expanded);
 120         return ret;
 121 }
 122
 123 int git_config_include(const char *var, const char *value, void *data)
 124 {
 125         struct config_include_data *inc = data;
 126         const char *type;
 127         int ret;
 128
 129         /*
 130          * Pass along all values, including "include" directives; this makes it
 131          * possible to query information on the includes themselves.
 132          */
 133         ret = inc->fn(var, value, inc->data);
 134         if (ret < 0)
 135                 return ret;
 136
 137         type = skip_prefix(var, "include.");
 138         if (!type)
 139                 return ret;
 140
 141         if (!strcmp(type, "path"))
 142                 ret = handle_path_include(value, inc);
 143         return ret;
 144 }
 145
 146 static void lowercase(char *p)
 147 {
 148         for (; *p; p++)
 149                 *p = tolower(*p);
 150 }
 151
 152 void git_config_push_parameter(const char *text)
 153 {
 154         struct strbuf env = STRBUF_INIT;
 155         const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
 156         if (old) {
 157                 strbuf_addstr(&env, old);
 158                 strbuf_addch(&env, ' ');
 159         }
 160         sq_quote_buf(&env, text);
 161         setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
 162         strbuf_release(&env);
 163 }
 164
 165 int git_config_parse_parameter(const char *text,
 166                                config_fn_t fn, void *data)
 167 {
 168         struct strbuf **pair;
 169         pair = strbuf_split_str(text, '=', 2);
 170         if (!pair[0])
 171                 return error("bogus config parameter: %s", text);
 172         if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
 173                 strbuf_setlen(pair[0], pair[0]->len - 1);
 174         strbuf_trim(pair[0]);
 175         if (!pair[0]->len) {
 176                 strbuf_list_free(pair);
 177                 return error("bogus config parameter: %s", text);
 178         }
 179         lowercase(pair[0]->buf);
 180         if (fn(pair[0]->buf, pair[1] ? pair[1]->buf : NULL, data) < 0) {
 181                 strbuf_list_free(pair);
 182                 return -1;
 183         }
 184         strbuf_list_free(pair);
 185         return 0;
 186 }
 187
 188 int git_config_from_parameters(config_fn_t fn, void *data)
 189 {
 190         const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 191         char *envw;
 192         const char **argv = NULL;
 193         int nr = 0, alloc = 0;
 194         int i;
 195
 196         if (!env)
 197                 return 0;
 198         /* sq_dequote will write over it */
 199         envw = xstrdup(env);
 200
 201         if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 202                 free(envw);
 203                 return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
 204         }
 205
 206         for (i = 0; i < nr; i++) {
 207                 if (git_config_parse_parameter(argv[i], fn, data) < 0) {
 208                         free(argv);
 209                         free(envw);
 210                         return -1;
 211                 }
 212         }
 213
 214         free(argv);
 215         free(envw);
 216         return nr > 0;
 217 }
 218
 219 static int get_next_char(void)
 220 {
 221         int c = cf->do_fgetc(cf);
 222
 223         if (c == '\r') {
 224                 /* DOS like systems */
 225                 c = cf->do_fgetc(cf);
 226                 if (c != '\n') {
 227                         cf->do_ungetc(c, cf);
 228                         c = '\r';
 229                 }
 230         }
 231         if (c == '\n')
 232                 cf->linenr++;
 233         if (c == EOF) {
 234                 cf->eof = 1;
 235                 c = '\n';
 236         }
 237         return c;
 238 }
 239
 240 static char *parse_value(void)
 241 {
 242         int quote = 0, comment = 0, space = 0;
 243
 244         strbuf_reset(&cf->value);
 245         for (;;) {
 246                 int c = get_next_char();
 247                 if (c == '\n') {
 248                         if (quote) {
 249                                 cf->linenr--;
 250                                 return NULL;
 251                         }
 252                         return cf->value.buf;
 253                 }
 254                 if (comment)
 255                         continue;
 256                 if (isspace(c) && !quote) {
 257                         if (cf->value.len)
 258                                 space++;
 259                         continue;
 260                 }
 261                 if (!quote) {
 262                         if (c == ';' || c == '#') {
 263                                 comment = 1;
 264                                 continue;
 265                         }
 266                 }
 267                 for (; space; space--)
 268                         strbuf_addch(&cf->value, ' ');
 269                 if (c == '\\') {
 270                         c = get_next_char();
 271                         switch (c) {
 272                         case '\n':
 273                                 continue;
 274                         case 't':
 275                                 c = '\t';
 276                                 break;
 277                         case 'b':
 278                                 c = '\b';
 279                                 break;
 280                         case 'n':
 281                                 c = '\n';
 282                                 break;
 283                         /* Some characters escape as themselves */
 284                         case '\\': case '"':
 285                                 break;
 286                         /* Reject unknown escape sequences */
 287                         default:
 288                                 return NULL;
 289                         }
 290                         strbuf_addch(&cf->value, c);
 291                         continue;
 292                 }
 293                 if (c == '"') {
 294                         quote = 1-quote;
 295                         continue;
 296                 }
 297                 strbuf_addch(&cf->value, c);
 298         }
 299 }
 300
 301 static inline int iskeychar(int c)
 302 {
 303         return isalnum(c) || c == '-';
 304 }
 305
 306 static int get_value(config_fn_t fn, void *data, struct strbuf *name)
 307 {
 308         int c;
 309         char *value;
 310
 311         /* Get the full name */
 312         for (;;) {
 313                 c = get_next_char();
 314                 if (cf->eof)
 315                         break;
 316                 if (!iskeychar(c))
 317                         break;
 318                 strbuf_addch(name, tolower(c));
 319         }
 320
 321         while (c == ' ' || c == '\t')
 322                 c = get_next_char();
 323
 324         value = NULL;
 325         if (c != '\n') {
 326                 if (c != '=')
 327                         return -1;
 328                 value = parse_value();
 329                 if (!value)
 330                         return -1;
 331         }
 332         return fn(name->buf, value, data);
 333 }
 334
 335 static int get_extended_base_var(struct strbuf *name, int c)
 336 {
 337         do {
 338                 if (c == '\n')
 339                         goto error_incomplete_line;
 340                 c = get_next_char();
 341         } while (isspace(c));
 342
 343         /* We require the format to be '[base "extension"]' */
 344         if (c != '"')
 345                 return -1;
 346         strbuf_addch(name, '.');
 347
 348         for (;;) {
 349                 int c = get_next_char();
 350                 if (c == '\n')
 351                         goto error_incomplete_line;
 352                 if (c == '"')
 353                         break;
 354                 if (c == '\\') {
 355                         c = get_next_char();
 356                         if (c == '\n')
 357                                 goto error_incomplete_line;
 358                 }
 359                 strbuf_addch(name, c);
 360         }
 361
 362         /* Final ']' */
 363         if (get_next_char() != ']')
 364                 return -1;
 365         return 0;
 366 error_incomplete_line:
 367         cf->linenr--;
 368         return -1;
 369 }
 370
 371 static int get_base_var(struct strbuf *name)
 372 {
 373         for (;;) {
 374                 int c = get_next_char();
 375                 if (cf->eof)
 376                         return -1;
 377                 if (c == ']')
 378                         return 0;
 379                 if (isspace(c))
 380                         return get_extended_base_var(name, c);
 381                 if (!iskeychar(c) && c != '.')
 382                         return -1;
 383                 strbuf_addch(name, tolower(c));
 384         }
 385 }
 386
 387 static int git_parse_source(config_fn_t fn, void *data)
 388 {
 389         int comment = 0;
 390         int baselen = 0;
 391         struct strbuf *var = &cf->var;
 392
 393         /* U+FEFF Byte Order Mark in UTF8 */
 394         static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 395         const unsigned char *bomptr = utf8_bom;
 396
 397         for (;;) {
 398                 int c = get_next_char();
 399                 if (bomptr && *bomptr) {
 400                         /* We are at the file beginning; skip UTF8-encoded BOM
 401                          * if present. Sane editors won't put this in on their
 402                          * own, but e.g. Windows Notepad will do it happily. */
 403                         if ((unsigned char) c == *bomptr) {
 404                                 bomptr++;
 405                                 continue;
 406                         } else {
 407                                 /* Do not tolerate partial BOM. */
 408                                 if (bomptr != utf8_bom)
 409                                         break;
 410                                 /* No BOM at file beginning. Cool. */
 411                                 bomptr = NULL;
 412                         }
 413                 }
 414                 if (c == '\n') {
 415                         if (cf->eof)
 416                                 return 0;
 417                         comment = 0;
 418                         continue;
 419                 }
 420                 if (comment || isspace(c))
 421                         continue;
 422                 if (c == '#' || c == ';') {
 423                         comment = 1;
 424                         continue;
 425                 }
 426                 if (c == '[') {
 427                         /* Reset prior to determining a new stem */
 428                         strbuf_reset(var);
 429                         if (get_base_var(var) < 0 || var->len < 1)
 430                                 break;
 431                         strbuf_addch(var, '.');
 432                         baselen = var->len;
 433                         continue;
 434                 }
 435                 if (!isalpha(c))
 436                         break;
 437                 /*
 438                  * Truncate the var name back to the section header
 439                  * stem prior to grabbing the suffix part of the name
 440                  * and the value.
 441                  */
 442                 strbuf_setlen(var, baselen);
 443                 strbuf_addch(var, tolower(c));
 444                 if (get_value(fn, data, var) < 0)
 445                         break;
 446         }
 447         if (cf->die_on_error)
 448                 die("bad config file line %d in %s", cf->linenr, cf->name);
 449         else
 450                 return error("bad config file line %d in %s", cf->linenr, cf->name);
 451 }
 452
 453 static int parse_unit_factor(const char *end, uintmax_t *val)
 454 {
 455         if (!*end)
 456                 return 1;
 457         else if (!strcasecmp(end, "k")) {
 458                 *val *= 1024;
 459                 return 1;
 460         }
 461         else if (!strcasecmp(end, "m")) {
 462                 *val *= 1024 * 1024;
 463                 return 1;
 464         }
 465         else if (!strcasecmp(end, "g")) {
 466                 *val *= 1024 * 1024 * 1024;
 467                 return 1;
 468         }
 469         return 0;
 470 }
 471
 472 static int git_parse_signed(const char *value, intmax_t *ret, intmax_t max)
 473 {
 474         if (value && *value) {
 475                 char *end;
 476                 intmax_t val;
 477                 uintmax_t uval;
 478                 uintmax_t factor = 1;
 479
 480                 errno = 0;
 481                 val = strtoimax(value, &end, 0);
 482                 if (errno == ERANGE)
 483                         return 0;
 484                 if (!parse_unit_factor(end, &factor)) {
 485                         errno = EINVAL;
 486                         return 0;
 487                 }
 488                 uval = abs(val);
 489                 uval *= factor;
 490                 if (uval > max || abs(val) > uval) {
 491                         errno = ERANGE;
 492                         return 0;
 493                 }
 494                 val *= factor;
 495                 *ret = val;
 496                 return 1;
 497         }
 498         errno = EINVAL;
 499         return 0;
 500 }
 501
 502 static int git_parse_unsigned(const char *value, uintmax_t *ret, uintmax_t max)
 503 {
 504         if (value && *value) {
 505                 char *end;
 506                 uintmax_t val;
 507                 uintmax_t oldval;
 508
 509                 errno = 0;
 510                 val = strtoumax(value, &end, 0);
 511                 if (errno == ERANGE)
 512                         return 0;
 513                 oldval = val;
 514                 if (!parse_unit_factor(end, &val)) {
 515                         errno = EINVAL;
 516                         return 0;
 517                 }
 518                 if (val > max || oldval > val) {
 519                         errno = ERANGE;
 520                         return 0;
 521                 }
 522                 *ret = val;
 523                 return 1;
 524         }
 525         errno = EINVAL;
 526         return 0;
 527 }
 528
 529 static int git_parse_int(const char *value, int *ret)
 530 {
 531         intmax_t tmp;
 532         if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int)))
 533                 return 0;
 534         *ret = tmp;
 535         return 1;
 536 }
 537
 538 static int git_parse_int64(const char *value, int64_t *ret)
 539 {
 540         intmax_t tmp;
 541         if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int64_t)))
 542                 return 0;
 543         *ret = tmp;
 544         return 1;
 545 }
 546
 547 int git_parse_ulong(const char *value, unsigned long *ret)
 548 {
 549         uintmax_t tmp;
 550         if (!git_parse_unsigned(value, &tmp, maximum_unsigned_value_of_type(long)))
 551                 return 0;
 552         *ret = tmp;
 553         return 1;
 554 }
 555
 556 static void die_bad_number(const char *name, const char *value)
 557 {
 558         const char *reason = errno == ERANGE ?
 559                              "out of range" :
 560                              "invalid unit";
 561         if (!value)
 562                 value = "";
 563
 564         if (cf && cf->name)
 565                 die("bad numeric config value '%s' for '%s' in %s: %s",
 566                     value, name, cf->name, reason);
 567         die("bad numeric config value '%s' for '%s': %s", value, name, reason);
 568 }
 569
 570 int git_config_int(const char *name, const char *value)
 571 {
 572         int ret;
 573         if (!git_parse_int(value, &ret))
 574                 die_bad_number(name, value);
 575         return ret;
 576 }
 577
 578 int64_t git_config_int64(const char *name, const char *value)
 579 {
 580         int64_t ret;
 581         if (!git_parse_int64(value, &ret))
 582                 die_bad_number(name, value);
 583         return ret;
 584 }
 585
 586 unsigned long git_config_ulong(const char *name, const char *value)
 587 {
 588         unsigned long ret;
 589         if (!git_parse_ulong(value, &ret))
 590                 die_bad_number(name, value);
 591         return ret;
 592 }
 593
 594 static int git_config_maybe_bool_text(const char *name, const char *value)
 595 {
 596         if (!value)
 597                 return 1;
 598         if (!*value)
 599                 return 0;
 600         if (!strcasecmp(value, "true")
 601             || !strcasecmp(value, "yes")
 602             || !strcasecmp(value, "on"))
 603                 return 1;
 604         if (!strcasecmp(value, "false")
 605             || !strcasecmp(value, "no")
 606             || !strcasecmp(value, "off"))
 607                 return 0;
 608         return -1;
 609 }
 610
 611 int git_config_maybe_bool(const char *name, const char *value)
 612 {
 613         int v = git_config_maybe_bool_text(name, value);
 614         if (0 <= v)
 615                 return v;
 616         if (git_parse_int(value, &v))
 617                 return !!v;
 618         return -1;
 619 }
 620
 621 int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 622 {
 623         int v = git_config_maybe_bool_text(name, value);
 624         if (0 <= v) {
 625                 *is_bool = 1;
 626                 return v;
 627         }
 628         *is_bool = 0;
 629         return git_config_int(name, value);
 630 }
 631
 632 int git_config_bool(const char *name, const char *value)
 633 {
 634         int discard;
 635         return !!git_config_bool_or_int(name, value, &discard);
 636 }
 637
 638 int git_config_string(const char **dest, const char *var, const char *value)
 639 {
 640         if (!value)
 641                 return config_error_nonbool(var);
 642         *dest = xstrdup(value);
 643         return 0;
 644 }
 645
 646 int git_config_pathname(const char **dest, const char *var, const char *value)
 647 {
 648         if (!value)
 649                 return config_error_nonbool(var);
 650         *dest = expand_user_path(value);
 651         if (!*dest)
 652                 die("Failed to expand user dir in: '%s'", value);
 653         return 0;
 654 }
 655
 656 static int git_default_core_config(const char *var, const char *value)
 657 {
 658         /* This needs a better name */
 659         if (!strcmp(var, "core.filemode")) {
 660                 trust_executable_bit = git_config_bool(var, value);
 661                 return 0;
 662         }
 663         if (!strcmp(var, "core.trustctime")) {
 664                 trust_ctime = git_config_bool(var, value);
 665                 return 0;
 666         }
 667         if (!strcmp(var, "core.statinfo") ||
 668             !strcmp(var, "core.checkstat")) {
 669                 /*
 670                  * NEEDSWORK: statinfo was a typo in v1.8.2 that has
 671                  * never been advertised.  we will remove it at Git
 672                  * 2.0 boundary.
 673                  */
 674                 if (!strcmp(var, "core.statinfo")) {
 675                         static int warned;
 676                         if (!warned++) {
 677                                 warning("'core.statinfo' will be removed in Git 2.0; "
 678                                         "use 'core.checkstat' instead.");
 679                         }
 680                 }
 681                 if (!strcasecmp(value, "default"))
 682                         check_stat = 1;
 683                 else if (!strcasecmp(value, "minimal"))
 684                         check_stat = 0;
 685         }
 686
 687         if (!strcmp(var, "core.quotepath")) {
 688                 quote_path_fully = git_config_bool(var, value);
 689                 return 0;
 690         }
 691
 692         if (!strcmp(var, "core.symlinks")) {
 693                 has_symlinks = git_config_bool(var, value);
 694                 return 0;
 695         }
 696
 697         if (!strcmp(var, "core.ignorecase")) {
 698                 ignore_case = git_config_bool(var, value);
 699                 return 0;
 700         }
 701
 702         if (!strcmp(var, "core.attributesfile"))
 703                 return git_config_pathname(&git_attributes_file, var, value);
 704
 705         if (!strcmp(var, "core.bare")) {
 706                 is_bare_repository_cfg = git_config_bool(var, value);
 707                 return 0;
 708         }
 709
 710         if (!strcmp(var, "core.ignorestat")) {
 711                 assume_unchanged = git_config_bool(var, value);
 712                 return 0;
 713         }
 714
 715         if (!strcmp(var, "core.prefersymlinkrefs")) {
 716                 prefer_symlink_refs = git_config_bool(var, value);
 717                 return 0;
 718         }
 719
 720         if (!strcmp(var, "core.logallrefupdates")) {
 721                 log_all_ref_updates = git_config_bool(var, value);
 722                 return 0;
 723         }
 724
 725         if (!strcmp(var, "core.warnambiguousrefs")) {
 726                 warn_ambiguous_refs = git_config_bool(var, value);
 727                 return 0;
 728         }
 729
 730         if (!strcmp(var, "core.abbrev")) {
 731                 int abbrev = git_config_int(var, value);
 732                 if (abbrev < minimum_abbrev || abbrev > 40)
 733                         return -1;
 734                 default_abbrev = abbrev;
 735                 return 0;
 736         }
 737
 738         if (!strcmp(var, "core.loosecompression")) {
 739                 int level = git_config_int(var, value);
 740                 if (level == -1)
 741                         level = Z_DEFAULT_COMPRESSION;
 742                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 743                         die("bad zlib compression level %d", level);
 744                 zlib_compression_level = level;
 745                 zlib_compression_seen = 1;
 746                 return 0;
 747         }
 748
 749         if (!strcmp(var, "core.compression")) {
 750                 int level = git_config_int(var, value);
 751                 if (level == -1)
 752                         level = Z_DEFAULT_COMPRESSION;
 753                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 754                         die("bad zlib compression level %d", level);
 755                 core_compression_level = level;
 756                 core_compression_seen = 1;
 757                 if (!zlib_compression_seen)
 758                         zlib_compression_level = level;
 759                 return 0;
 760         }
 761
 762         if (!strcmp(var, "core.packedgitwindowsize")) {
 763                 int pgsz_x2 = getpagesize() * 2;
 764                 packed_git_window_size = git_config_ulong(var, value);
 765
 766                 /* This value must be multiple of (pagesize * 2) */
 767                 packed_git_window_size /= pgsz_x2;
 768                 if (packed_git_window_size < 1)
 769                         packed_git_window_size = 1;
 770                 packed_git_window_size *= pgsz_x2;
 771                 return 0;
 772         }
 773
 774         if (!strcmp(var, "core.bigfilethreshold")) {
 775                 big_file_threshold = git_config_ulong(var, value);
 776                 return 0;
 777         }
 778
 779         if (!strcmp(var, "core.packedgitlimit")) {
 780                 packed_git_limit = git_config_ulong(var, value);
 781                 return 0;
 782         }
 783
 784         if (!strcmp(var, "core.deltabasecachelimit")) {
 785                 delta_base_cache_limit = git_config_ulong(var, value);
 786                 return 0;
 787         }
 788
 789         if (!strcmp(var, "core.autocrlf")) {
 790                 if (value && !strcasecmp(value, "input")) {
 791                         if (core_eol == EOL_CRLF)
 792                                 return error("core.autocrlf=input conflicts with core.eol=crlf");
 793                         auto_crlf = AUTO_CRLF_INPUT;
 794                         return 0;
 795                 }
 796                 auto_crlf = git_config_bool(var, value);
 797                 return 0;
 798         }
 799
 800         if (!strcmp(var, "core.safecrlf")) {
 801                 if (value && !strcasecmp(value, "warn")) {
 802                         safe_crlf = SAFE_CRLF_WARN;
 803                         return 0;
 804                 }
 805                 safe_crlf = git_config_bool(var, value);
 806                 return 0;
 807         }
 808
 809         if (!strcmp(var, "core.eol")) {
 810                 if (value && !strcasecmp(value, "lf"))
 811                         core_eol = EOL_LF;
 812                 else if (value && !strcasecmp(value, "crlf"))
 813                         core_eol = EOL_CRLF;
 814                 else if (value && !strcasecmp(value, "native"))
 815                         core_eol = EOL_NATIVE;
 816                 else
 817                         core_eol = EOL_UNSET;
 818                 if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 819                         return error("core.autocrlf=input conflicts with core.eol=crlf");
 820                 return 0;
 821         }
 822
 823         if (!strcmp(var, "core.notesref")) {
 824                 notes_ref_name = xstrdup(value);
 825                 return 0;
 826         }
 827
 828         if (!strcmp(var, "core.pager"))
 829                 return git_config_string(&pager_program, var, value);
 830
 831         if (!strcmp(var, "core.editor"))
 832                 return git_config_string(&editor_program, var, value);
 833
 834         if (!strcmp(var, "core.commentchar")) {
 835                 const char *comment;
 836                 int ret = git_config_string(&comment, var, value);
 837                 if (!ret)
 838                         comment_line_char = comment[0];
 839                 return ret;
 840         }
 841
 842         if (!strcmp(var, "core.askpass"))
 843                 return git_config_string(&askpass_program, var, value);
 844
 845         if (!strcmp(var, "core.excludesfile"))
 846                 return git_config_pathname(&excludes_file, var, value);
 847
 848         if (!strcmp(var, "core.whitespace")) {
 849                 if (!value)
 850                         return config_error_nonbool(var);
 851                 whitespace_rule_cfg = parse_whitespace_rule(value);
 852                 return 0;
 853         }
 854
 855         if (!strcmp(var, "core.fsyncobjectfiles")) {
 856                 fsync_object_files = git_config_bool(var, value);
 857                 return 0;
 858         }
 859
 860         if (!strcmp(var, "core.preloadindex")) {
 861                 core_preload_index = git_config_bool(var, value);
 862                 return 0;
 863         }
 864
 865         if (!strcmp(var, "core.createobject")) {
 866                 if (!strcmp(value, "rename"))
 867                         object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 868                 else if (!strcmp(value, "link"))
 869                         object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 870                 else
 871                         die("Invalid mode for object creation: %s", value);
 872                 return 0;
 873         }
 874
 875         if (!strcmp(var, "core.sparsecheckout")) {
 876                 core_apply_sparse_checkout = git_config_bool(var, value);
 877                 return 0;
 878         }
 879
 880         if (!strcmp(var, "core.precomposeunicode")) {
 881                 precomposed_unicode = git_config_bool(var, value);
 882                 return 0;
 883         }
 884
 885         /* Add other config variables here and to Documentation/config.txt. */
 886         return 0;
 887 }
 888
 889 static int git_default_i18n_config(const char *var, const char *value)
 890 {
 891         if (!strcmp(var, "i18n.commitencoding"))
 892                 return git_config_string(&git_commit_encoding, var, value);
 893
 894         if (!strcmp(var, "i18n.logoutputencoding"))
 895                 return git_config_string(&git_log_output_encoding, var, value);
 896
 897         /* Add other config variables here and to Documentation/config.txt. */
 898         return 0;
 899 }
 900
 901 static int git_default_branch_config(const char *var, const char *value)
 902 {
 903         if (!strcmp(var, "branch.autosetupmerge")) {
 904                 if (value && !strcasecmp(value, "always")) {
 905                         git_branch_track = BRANCH_TRACK_ALWAYS;
 906                         return 0;
 907                 }
 908                 git_branch_track = git_config_bool(var, value);
 909                 return 0;
 910         }
 911         if (!strcmp(var, "branch.autosetuprebase")) {
 912                 if (!value)
 913                         return config_error_nonbool(var);
 914                 else if (!strcmp(value, "never"))
 915                         autorebase = AUTOREBASE_NEVER;
 916                 else if (!strcmp(value, "local"))
 917                         autorebase = AUTOREBASE_LOCAL;
 918                 else if (!strcmp(value, "remote"))
 919                         autorebase = AUTOREBASE_REMOTE;
 920                 else if (!strcmp(value, "always"))
 921                         autorebase = AUTOREBASE_ALWAYS;
 922                 else
 923                         return error("Malformed value for %s", var);
 924                 return 0;
 925         }
 926
 927         /* Add other config variables here and to Documentation/config.txt. */
 928         return 0;
 929 }
 930
 931 static int git_default_push_config(const char *var, const char *value)
 932 {
 933         if (!strcmp(var, "push.default")) {
 934                 if (!value)
 935                         return config_error_nonbool(var);
 936                 else if (!strcmp(value, "nothing"))
 937                         push_default = PUSH_DEFAULT_NOTHING;
 938                 else if (!strcmp(value, "matching"))
 939                         push_default = PUSH_DEFAULT_MATCHING;
 940                 else if (!strcmp(value, "simple"))
 941                         push_default = PUSH_DEFAULT_SIMPLE;
 942                 else if (!strcmp(value, "upstream"))
 943                         push_default = PUSH_DEFAULT_UPSTREAM;
 944                 else if (!strcmp(value, "tracking")) /* deprecated */
 945                         push_default = PUSH_DEFAULT_UPSTREAM;
 946                 else if (!strcmp(value, "current"))
 947                         push_default = PUSH_DEFAULT_CURRENT;
 948                 else {
 949                         error("Malformed value for %s: %s", var, value);
 950                         return error("Must be one of nothing, matching, simple, "
 951                                      "upstream or current.");
 952                 }
 953                 return 0;
 954         }
 955
 956         /* Add other config variables here and to Documentation/config.txt. */
 957         return 0;
 958 }
 959
 960 static int git_default_mailmap_config(const char *var, const char *value)
 961 {
 962         if (!strcmp(var, "mailmap.file"))
 963                 return git_config_string(&git_mailmap_file, var, value);
 964         if (!strcmp(var, "mailmap.blob"))
 965                 return git_config_string(&git_mailmap_blob, var, value);
 966
 967         /* Add other config variables here and to Documentation/config.txt. */
 968         return 0;
 969 }
 970
 971 int git_default_config(const char *var, const char *value, void *dummy)
 972 {
 973         if (starts_with(var, "core."))
 974                 return git_default_core_config(var, value);
 975
 976         if (starts_with(var, "user."))
 977                 return git_ident_config(var, value, dummy);
 978
 979         if (starts_with(var, "i18n."))
 980                 return git_default_i18n_config(var, value);
 981
 982         if (starts_with(var, "branch."))
 983                 return git_default_branch_config(var, value);
 984
 985         if (starts_with(var, "push."))
 986                 return git_default_push_config(var, value);
 987
 988         if (starts_with(var, "mailmap."))
 989                 return git_default_mailmap_config(var, value);
 990
 991         if (starts_with(var, "advice."))
 992                 return git_default_advice_config(var, value);
 993
 994         if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 995                 pager_use_color = git_config_bool(var,value);
 996                 return 0;
 997         }
 998
 999         if (!strcmp(var, "pack.packsizelimit")) {
1000                 pack_size_limit_cfg = git_config_ulong(var, value);
1001                 return 0;
1002         }
1003         /* Add other config variables here and to Documentation/config.txt. */
1004         return 0;
1005 }
1006
1007 /*
1008  * All source specific fields in the union, die_on_error, name and the callbacks
1009  * fgetc, ungetc, ftell of top need to be initialized before calling
1010  * this function.
1011  */
1012 static int do_config_from(struct config_source *top, config_fn_t fn, void *data)
1013 {
1014         int ret;
1015
1016         /* push config-file parsing state stack */
1017         top->prev = cf;
1018         top->linenr = 1;
1019         top->eof = 0;
1020         strbuf_init(&top->value, 1024);
1021         strbuf_init(&top->var, 1024);
1022         cf = top;
1023
1024         ret = git_parse_source(fn, data);
1025
1026         /* pop config-file parsing state stack */
1027         strbuf_release(&top->value);
1028         strbuf_release(&top->var);
1029         cf = top->prev;
1030
1031         return ret;
1032 }
1033
1034 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
1035 {
1036         int ret;
1037         FILE *f = fopen(filename, "r");
1038
1039         ret = -1;
1040         if (f) {
1041                 struct config_source top;
1042
1043                 top.u.file = f;
1044                 top.name = top.path = filename;
1045                 top.die_on_error = 1;
1046                 top.do_fgetc = config_file_fgetc;
1047                 top.do_ungetc = config_file_ungetc;
1048                 top.do_ftell = config_file_ftell;
1049
1050                 ret = do_config_from(&top, fn, data);
1051
1052                 fclose(f);
1053         }
1054         return ret;
1055 }
1056
1057 int git_config_from_buf(config_fn_t fn, const char *name, const char *buf,
1058                         size_t len, void *data)
1059 {
1060         struct config_source top;
1061
1062         top.u.buf.buf = buf;
1063         top.u.buf.len = len;
1064         top.u.buf.pos = 0;
1065         top.name = name;
1066         top.path = NULL;
1067         top.die_on_error = 0;
1068         top.do_fgetc = config_buf_fgetc;
1069         top.do_ungetc = config_buf_ungetc;
1070         top.do_ftell = config_buf_ftell;
1071
1072         return do_config_from(&top, fn, data);
1073 }
1074
1075 static int git_config_from_blob_sha1(config_fn_t fn,
1076                                      const char *name,
1077                                      const unsigned char *sha1,
1078                                      void *data)
1079 {
1080         enum object_type type;
1081         char *buf;
1082         unsigned long size;
1083         int ret;
1084
1085         buf = read_sha1_file(sha1, &type, &size);
1086         if (!buf)
1087                 return error("unable to load config blob object '%s'", name);
1088         if (type != OBJ_BLOB) {
1089                 free(buf);
1090                 return error("reference '%s' does not point to a blob", name);
1091         }
1092
1093         ret = git_config_from_buf(fn, name, buf, size, data);
1094         free(buf);
1095
1096         return ret;
1097 }
1098
1099 static int git_config_from_blob_ref(config_fn_t fn,
1100                                     const char *name,
1101                                     void *data)
1102 {
1103         unsigned char sha1[20];
1104
1105         if (get_sha1(name, sha1) < 0)
1106                 return error("unable to resolve config blob '%s'", name);
1107         return git_config_from_blob_sha1(fn, name, sha1, data);
1108 }
1109
1110 const char *git_etc_gitconfig(void)
1111 {
1112         static const char *system_wide;
1113         if (!system_wide)
1114                 system_wide = system_path(ETC_GITCONFIG);
1115         return system_wide;
1116 }
1117
1118 int git_env_bool(const char *k, int def)
1119 {
1120         const char *v = getenv(k);
1121         return v ? git_config_bool(k, v) : def;
1122 }
1123
1124 int git_config_system(void)
1125 {
1126         return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
1127 }
1128
1129 int git_config_early(config_fn_t fn, void *data, const char *repo_config)
1130 {
1131         int ret = 0, found = 0;
1132         char *xdg_config = NULL;
1133         char *user_config = NULL;
1134
1135         home_config_paths(&user_config, &xdg_config, "config");
1136
1137         if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0)) {
1138                 ret += git_config_from_file(fn, git_etc_gitconfig(),
1139                                             data);
1140                 found += 1;
1141         }
1142
1143         if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK)) {
1144                 ret += git_config_from_file(fn, xdg_config, data);
1145                 found += 1;
1146         }
1147
1148         if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK)) {
1149                 ret += git_config_from_file(fn, user_config, data);
1150                 found += 1;
1151         }
1152
1153         if (repo_config && !access_or_die(repo_config, R_OK, 0)) {
1154                 ret += git_config_from_file(fn, repo_config, data);
1155                 found += 1;
1156         }
1157
1158         switch (git_config_from_parameters(fn, data)) {
1159         case -1: /* error */
1160                 die("unable to parse command-line config");
1161                 break;
1162         case 0: /* found nothing */
1163                 break;
1164         default: /* found at least one item */
1165                 found++;
1166                 break;
1167         }
1168
1169         free(xdg_config);
1170         free(user_config);
1171         return ret == 0 ? found : ret;
1172 }
1173
1174 int git_config_with_options(config_fn_t fn, void *data,
1175                             struct git_config_source *config_source,
1176                             int respect_includes)
1177 {
1178         char *repo_config = NULL;
1179         int ret;
1180         struct config_include_data inc = CONFIG_INCLUDE_INIT;
1181
1182         if (respect_includes) {
1183                 inc.fn = fn;
1184                 inc.data = data;
1185                 fn = git_config_include;
1186                 data = &inc;
1187         }
1188
1189         /*
1190          * If we have a specific filename, use it. Otherwise, follow the
1191          * regular lookup sequence.
1192          */
1193         if (config_source && config_source->file)
1194                 return git_config_from_file(fn, config_source->file, data);
1195         else if (config_source && config_source->blob)
1196                 return git_config_from_blob_ref(fn, config_source->blob, data);
1197
1198         repo_config = git_pathdup("config");
1199         ret = git_config_early(fn, data, repo_config);
1200         if (repo_config)
1201                 free(repo_config);
1202         return ret;
1203 }
1204
1205 int git_config(config_fn_t fn, void *data)
1206 {
1207         return git_config_with_options(fn, data, NULL, 1);
1208 }
1209
1210 /*
1211  * Find all the stuff for git_config_set() below.
1212  */
1213
1214 static struct {
1215         int baselen;
1216         char *key;
1217         int do_not_match;
1218         regex_t *value_regex;
1219         int multi_replace;
1220         size_t *offset;
1221         unsigned int offset_alloc;
1222         enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1223         int seen;
1224 } store;
1225
1226 static int matches(const char *key, const char *value)
1227 {
1228         return !strcmp(key, store.key) &&
1229                 (store.value_regex == NULL ||
1230                  (store.do_not_match ^
1231                   !regexec(store.value_regex, value, 0, NULL, 0)));
1232 }
1233
1234 static int store_aux(const char *key, const char *value, void *cb)
1235 {
1236         const char *ep;
1237         size_t section_len;
1238
1239         switch (store.state) {
1240         case KEY_SEEN:
1241                 if (matches(key, value)) {
1242                         if (store.seen == 1 && store.multi_replace == 0) {
1243                                 warning("%s has multiple values", key);
1244                         }
1245
1246                         ALLOC_GROW(store.offset, store.seen + 1,
1247                                    store.offset_alloc);
1248
1249                         store.offset[store.seen] = cf->do_ftell(cf);
1250                         store.seen++;
1251                 }
1252                 break;
1253         case SECTION_SEEN:
1254                 /*
1255                  * What we are looking for is in store.key (both
1256                  * section and var), and its section part is baselen
1257                  * long.  We found key (again, both section and var).
1258                  * We would want to know if this key is in the same
1259                  * section as what we are looking for.  We already
1260                  * know we are in the same section as what should
1261                  * hold store.key.
1262                  */
1263                 ep = strrchr(key, '.');
1264                 section_len = ep - key;
1265
1266                 if ((section_len != store.baselen) ||
1267                     memcmp(key, store.key, section_len+1)) {
1268                         store.state = SECTION_END_SEEN;
1269                         break;
1270                 }
1271
1272                 /*
1273                  * Do not increment matches: this is no match, but we
1274                  * just made sure we are in the desired section.
1275                  */
1276                 ALLOC_GROW(store.offset, store.seen + 1,
1277                            store.offset_alloc);
1278                 store.offset[store.seen] = cf->do_ftell(cf);
1279                 /* fallthru */
1280         case SECTION_END_SEEN:
1281         case START:
1282                 if (matches(key, value)) {
1283                         ALLOC_GROW(store.offset, store.seen + 1,
1284                                    store.offset_alloc);
1285                         store.offset[store.seen] = cf->do_ftell(cf);
1286                         store.state = KEY_SEEN;
1287                         store.seen++;
1288                 } else {
1289                         if (strrchr(key, '.') - key == store.baselen &&
1290                               !strncmp(key, store.key, store.baselen)) {
1291                                         store.state = SECTION_SEEN;
1292                                         ALLOC_GROW(store.offset,
1293                                                    store.seen + 1,
1294                                                    store.offset_alloc);
1295                                         store.offset[store.seen] = cf->do_ftell(cf);
1296                         }
1297                 }
1298         }
1299         return 0;
1300 }
1301
1302 static int write_error(const char *filename)
1303 {
1304         error("failed to write new configuration file %s", filename);
1305
1306         /* Same error code as "failed to rename". */
1307         return 4;
1308 }
1309
1310 static int store_write_section(int fd, const char *key)
1311 {
1312         const char *dot;
1313         int i, success;
1314         struct strbuf sb = STRBUF_INIT;
1315
1316         dot = memchr(key, '.', store.baselen);
1317         if (dot) {
1318                 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1319                 for (i = dot - key + 1; i < store.baselen; i++) {
1320                         if (key[i] == '"' || key[i] == '\\')
1321                                 strbuf_addch(&sb, '\\');
1322                         strbuf_addch(&sb, key[i]);
1323                 }
1324                 strbuf_addstr(&sb, "\"]\n");
1325         } else {
1326                 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1327         }
1328
1329         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1330         strbuf_release(&sb);
1331
1332         return success;
1333 }
1334
1335 static int store_write_pair(int fd, const char *key, const char *value)
1336 {
1337         int i, success;
1338         int length = strlen(key + store.baselen + 1);
1339         const char *quote = "";
1340         struct strbuf sb = STRBUF_INIT;
1341
1342         /*
1343          * Check to see if the value needs to be surrounded with a dq pair.
1344          * Note that problematic characters are always backslash-quoted; this
1345          * check is about not losing leading or trailing SP and strings that
1346          * follow beginning-of-comment characters (i.e. ';' and '#') by the
1347          * configuration parser.
1348          */
1349         if (value[0] == ' ')
1350                 quote = "\"";
1351         for (i = 0; value[i]; i++)
1352                 if (value[i] == ';' || value[i] == '#')
1353                         quote = "\"";
1354         if (i && value[i - 1] == ' ')
1355                 quote = "\"";
1356
1357         strbuf_addf(&sb, "\t%.*s = %s",
1358                     length, key + store.baselen + 1, quote);
1359
1360         for (i = 0; value[i]; i++)
1361                 switch (value[i]) {
1362                 case '\n':
1363                         strbuf_addstr(&sb, "\\n");
1364                         break;
1365                 case '\t':
1366                         strbuf_addstr(&sb, "\\t");
1367                         break;
1368                 case '"':
1369                 case '\\':
1370                         strbuf_addch(&sb, '\\');
1371                 default:
1372                         strbuf_addch(&sb, value[i]);
1373                         break;
1374                 }
1375         strbuf_addf(&sb, "%s\n", quote);
1376
1377         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1378         strbuf_release(&sb);
1379
1380         return success;
1381 }
1382
1383 static ssize_t find_beginning_of_line(const char *contents, size_t size,
1384         size_t offset_, int *found_bracket)
1385 {
1386         size_t equal_offset = size, bracket_offset = size;
1387         ssize_t offset;
1388
1389 contline:
1390         for (offset = offset_-2; offset > 0
1391                         && contents[offset] != '\n'; offset--)
1392                 switch (contents[offset]) {
1393                         case '=': equal_offset = offset; break;
1394                         case ']': bracket_offset = offset; break;
1395                 }
1396         if (offset > 0 && contents[offset-1] == '\\') {
1397                 offset_ = offset;
1398                 goto contline;
1399         }
1400         if (bracket_offset < equal_offset) {
1401                 *found_bracket = 1;
1402                 offset = bracket_offset+1;
1403         } else
1404                 offset++;
1405
1406         return offset;
1407 }
1408
1409 int git_config_set_in_file(const char *config_filename,
1410                         const char *key, const char *value)
1411 {
1412         return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1413 }
1414
1415 int git_config_set(const char *key, const char *value)
1416 {
1417         return git_config_set_multivar(key, value, NULL, 0);
1418 }
1419
1420 /*
1421  * Auxiliary function to sanity-check and split the key into the section
1422  * identifier and variable name.
1423  *
1424  * Returns 0 on success, -1 when there is an invalid character in the key and
1425  * -2 if there is no section name in the key.
1426  *
1427  * store_key - pointer to char* which will hold a copy of the key with
1428  *             lowercase section and variable name
1429  * baselen - pointer to int which will hold the length of the
1430  *           section + subsection part, can be NULL
1431  */
1432 int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1433 {
1434         int i, dot, baselen;
1435         const char *last_dot = strrchr(key, '.');
1436
1437         /*
1438          * Since "key" actually contains the section name and the real
1439          * key name separated by a dot, we have to know where the dot is.
1440          */
1441
1442         if (last_dot == NULL || last_dot == key) {
1443                 error("key does not contain a section: %s", key);
1444                 return -CONFIG_NO_SECTION_OR_NAME;
1445         }
1446
1447         if (!last_dot[1]) {
1448                 error("key does not contain variable name: %s", key);
1449                 return -CONFIG_NO_SECTION_OR_NAME;
1450         }
1451
1452         baselen = last_dot - key;
1453         if (baselen_)
1454                 *baselen_ = baselen;
1455
1456         /*
1457          * Validate the key and while at it, lower case it for matching.
1458          */
1459         *store_key = xmalloc(strlen(key) + 1);
1460
1461         dot = 0;
1462         for (i = 0; key[i]; i++) {
1463                 unsigned char c = key[i];
1464                 if (c == '.')
1465                         dot = 1;
1466                 /* Leave the extended basename untouched.. */
1467                 if (!dot || i > baselen) {
1468                         if (!iskeychar(c) ||
1469                             (i == baselen + 1 && !isalpha(c))) {
1470                                 error("invalid key: %s", key);
1471                                 goto out_free_ret_1;
1472                         }
1473                         c = tolower(c);
1474                 } else if (c == '\n') {
1475                         error("invalid key (newline): %s", key);
1476                         goto out_free_ret_1;
1477                 }
1478                 (*store_key)[i] = c;
1479         }
1480         (*store_key)[i] = 0;
1481
1482         return 0;
1483
1484 out_free_ret_1:
1485         free(*store_key);
1486         *store_key = NULL;
1487         return -CONFIG_INVALID_KEY;
1488 }
1489
1490 /*
1491  * If value==NULL, unset in (remove from) config,
1492  * if value_regex!=NULL, disregard key/value pairs where value does not match.
1493  * if multi_replace==0, nothing, or only one matching key/value is replaced,
1494  *     else all matching key/values (regardless how many) are removed,
1495  *     before the new pair is written.
1496  *
1497  * Returns 0 on success.
1498  *
1499  * This function does this:
1500  *
1501  * - it locks the config file by creating ".git/config.lock"
1502  *
1503  * - it then parses the config using store_aux() as validator to find
1504  *   the position on the key/value pair to replace. If it is to be unset,
1505  *   it must be found exactly once.
1506  *
1507  * - the config file is mmap()ed and the part before the match (if any) is
1508  *   written to the lock file, then the changed part and the rest.
1509  *
1510  * - the config file is removed and the lock file rename()d to it.
1511  *
1512  */
1513 int git_config_set_multivar_in_file(const char *config_filename,
1514                                 const char *key, const char *value,
1515                                 const char *value_regex, int multi_replace)
1516 {
1517         int fd = -1, in_fd;
1518         int ret;
1519         struct lock_file *lock = NULL;
1520         char *filename_buf = NULL;
1521
1522         /* parse-key returns negative; flip the sign to feed exit(3) */
1523         ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1524         if (ret)
1525                 goto out_free;
1526
1527         store.multi_replace = multi_replace;
1528
1529         if (!config_filename)
1530                 config_filename = filename_buf = git_pathdup("config");
1531
1532         /*
1533          * The lock serves a purpose in addition to locking: the new
1534          * contents of .git/config will be written into it.
1535          */
1536         lock = xcalloc(sizeof(struct lock_file), 1);
1537         fd = hold_lock_file_for_update(lock, config_filename, 0);
1538         if (fd < 0) {
1539                 error("could not lock config file %s: %s", config_filename, strerror(errno));
1540                 free(store.key);
1541                 ret = CONFIG_NO_LOCK;
1542                 goto out_free;
1543         }
1544
1545         /*
1546          * If .git/config does not exist yet, write a minimal version.
1547          */
1548         in_fd = open(config_filename, O_RDONLY);
1549         if ( in_fd < 0 ) {
1550                 free(store.key);
1551
1552                 if ( ENOENT != errno ) {
1553                         error("opening %s: %s", config_filename,
1554                               strerror(errno));
1555                         ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1556                         goto out_free;
1557                 }
1558                 /* if nothing to unset, error out */
1559                 if (value == NULL) {
1560                         ret = CONFIG_NOTHING_SET;
1561                         goto out_free;
1562                 }
1563
1564                 store.key = (char *)key;
1565                 if (!store_write_section(fd, key) ||
1566                     !store_write_pair(fd, key, value))
1567                         goto write_err_out;
1568         } else {
1569                 struct stat st;
1570                 char *contents;
1571                 size_t contents_sz, copy_begin, copy_end;
1572                 int i, new_line = 0;
1573
1574                 if (value_regex == NULL)
1575                         store.value_regex = NULL;
1576                 else {
1577                         if (value_regex[0] == '!') {
1578                                 store.do_not_match = 1;
1579                                 value_regex++;
1580                         } else
1581                                 store.do_not_match = 0;
1582
1583                         store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1584                         if (regcomp(store.value_regex, value_regex,
1585                                         REG_EXTENDED)) {
1586                                 error("invalid pattern: %s", value_regex);
1587                                 free(store.value_regex);
1588                                 ret = CONFIG_INVALID_PATTERN;
1589                                 goto out_free;
1590                         }
1591                 }
1592
1593                 ALLOC_GROW(store.offset, 1, store.offset_alloc);
1594                 store.offset[0] = 0;
1595                 store.state = START;
1596                 store.seen = 0;
1597
1598                 /*
1599                  * After this, store.offset will contain the *end* offset
1600                  * of the last match, or remain at 0 if no match was found.
1601                  * As a side effect, we make sure to transform only a valid
1602                  * existing config file.
1603                  */
1604                 if (git_config_from_file(store_aux, config_filename, NULL)) {
1605                         error("invalid config file %s", config_filename);
1606                         free(store.key);
1607                         if (store.value_regex != NULL) {
1608                                 regfree(store.value_regex);
1609                                 free(store.value_regex);
1610                         }
1611                         ret = CONFIG_INVALID_FILE;
1612                         goto out_free;
1613                 }
1614
1615                 free(store.key);
1616                 if (store.value_regex != NULL) {
1617                         regfree(store.value_regex);
1618                         free(store.value_regex);
1619                 }
1620
1621                 /* if nothing to unset, or too many matches, error out */
1622                 if ((store.seen == 0 && value == NULL) ||
1623                                 (store.seen > 1 && multi_replace == 0)) {
1624                         ret = CONFIG_NOTHING_SET;
1625                         goto out_free;
1626                 }
1627
1628                 fstat(in_fd, &st);
1629                 contents_sz = xsize_t(st.st_size);
1630                 contents = xmmap(NULL, contents_sz, PROT_READ,
1631                         MAP_PRIVATE, in_fd, 0);
1632                 close(in_fd);
1633
1634                 if (store.seen == 0)
1635                         store.seen = 1;
1636
1637                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1638                         if (store.offset[i] == 0) {
1639                                 store.offset[i] = copy_end = contents_sz;
1640                         } else if (store.state != KEY_SEEN) {
1641                                 copy_end = store.offset[i];
1642                         } else
1643                                 copy_end = find_beginning_of_line(
1644                                         contents, contents_sz,
1645                                         store.offset[i]-2, &new_line);
1646
1647                         if (copy_end > 0 && contents[copy_end-1] != '\n')
1648                                 new_line = 1;
1649
1650                         /* write the first part of the config */
1651                         if (copy_end > copy_begin) {
1652                                 if (write_in_full(fd, contents + copy_begin,
1653                                                   copy_end - copy_begin) <
1654                                     copy_end - copy_begin)
1655                                         goto write_err_out;
1656                                 if (new_line &&
1657                                     write_str_in_full(fd, "\n") != 1)
1658                                         goto write_err_out;
1659                         }
1660                         copy_begin = store.offset[i];
1661                 }
1662
1663                 /* write the pair (value == NULL means unset) */
1664                 if (value != NULL) {
1665                         if (store.state == START) {
1666                                 if (!store_write_section(fd, key))
1667                                         goto write_err_out;
1668                         }
1669                         if (!store_write_pair(fd, key, value))
1670                                 goto write_err_out;
1671                 }
1672
1673                 /* write the rest of the config */
1674                 if (copy_begin < contents_sz)
1675                         if (write_in_full(fd, contents + copy_begin,
1676                                           contents_sz - copy_begin) <
1677                             contents_sz - copy_begin)
1678                                 goto write_err_out;
1679
1680                 munmap(contents, contents_sz);
1681         }
1682
1683         if (commit_lock_file(lock) < 0) {
1684                 error("could not commit config file %s", config_filename);
1685                 ret = CONFIG_NO_WRITE;
1686                 goto out_free;
1687         }
1688
1689         /*
1690          * lock is committed, so don't try to roll it back below.
1691          * NOTE: Since lockfile.c keeps a linked list of all created
1692          * lock_file structures, it isn't safe to free(lock).  It's
1693          * better to just leave it hanging around.
1694          */
1695         lock = NULL;
1696         ret = 0;
1697
1698 out_free:
1699         if (lock)
1700                 rollback_lock_file(lock);
1701         free(filename_buf);
1702         return ret;
1703
1704 write_err_out:
1705         ret = write_error(lock->filename);
1706         goto out_free;
1707
1708 }
1709
1710 int git_config_set_multivar(const char *key, const char *value,
1711                         const char *value_regex, int multi_replace)
1712 {
1713         return git_config_set_multivar_in_file(NULL, key, value, value_regex,
1714                                                multi_replace);
1715 }
1716
1717 static int section_name_match (const char *buf, const char *name)
1718 {
1719         int i = 0, j = 0, dot = 0;
1720         if (buf[i] != '[')
1721                 return 0;
1722         for (i = 1; buf[i] && buf[i] != ']'; i++) {
1723                 if (!dot && isspace(buf[i])) {
1724                         dot = 1;
1725                         if (name[j++] != '.')
1726                                 break;
1727                         for (i++; isspace(buf[i]); i++)
1728                                 ; /* do nothing */
1729                         if (buf[i] != '"')
1730                                 break;
1731                         continue;
1732                 }
1733                 if (buf[i] == '\\' && dot)
1734                         i++;
1735                 else if (buf[i] == '"' && dot) {
1736                         for (i++; isspace(buf[i]); i++)
1737                                 ; /* do_nothing */
1738                         break;
1739                 }
1740                 if (buf[i] != name[j++])
1741                         break;
1742         }
1743         if (buf[i] == ']' && name[j] == 0) {
1744                 /*
1745                  * We match, now just find the right length offset by
1746                  * gobbling up any whitespace after it, as well
1747                  */
1748                 i++;
1749                 for (; buf[i] && isspace(buf[i]); i++)
1750                         ; /* do nothing */
1751                 return i;
1752         }
1753         return 0;
1754 }
1755
1756 static int section_name_is_ok(const char *name)
1757 {
1758         /* Empty section names are bogus. */
1759         if (!*name)
1760                 return 0;
1761
1762         /*
1763          * Before a dot, we must be alphanumeric or dash. After the first dot,
1764          * anything goes, so we can stop checking.
1765          */
1766         for (; *name && *name != '.'; name++)
1767                 if (*name != '-' && !isalnum(*name))
1768                         return 0;
1769         return 1;
1770 }
1771
1772 /* if new_name == NULL, the section is removed instead */
1773 int git_config_rename_section_in_file(const char *config_filename,
1774                                       const char *old_name, const char *new_name)
1775 {
1776         int ret = 0, remove = 0;
1777         char *filename_buf = NULL;
1778         struct lock_file *lock;
1779         int out_fd;
1780         char buf[1024];
1781         FILE *config_file;
1782
1783         if (new_name && !section_name_is_ok(new_name)) {
1784                 ret = error("invalid section name: %s", new_name);
1785                 goto out;
1786         }
1787
1788         if (!config_filename)
1789                 config_filename = filename_buf = git_pathdup("config");
1790
1791         lock = xcalloc(sizeof(struct lock_file), 1);
1792         out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1793         if (out_fd < 0) {
1794                 ret = error("could not lock config file %s", config_filename);
1795                 goto out;
1796         }
1797
1798         if (!(config_file = fopen(config_filename, "rb"))) {
1799                 /* no config file means nothing to rename, no error */
1800                 goto unlock_and_out;
1801         }
1802
1803         while (fgets(buf, sizeof(buf), config_file)) {
1804                 int i;
1805                 int length;
1806                 char *output = buf;
1807                 for (i = 0; buf[i] && isspace(buf[i]); i++)
1808                         ; /* do nothing */
1809                 if (buf[i] == '[') {
1810                         /* it's a section */
1811                         int offset = section_name_match(&buf[i], old_name);
1812                         if (offset > 0) {
1813                                 ret++;
1814                                 if (new_name == NULL) {
1815                                         remove = 1;
1816                                         continue;
1817                                 }
1818                                 store.baselen = strlen(new_name);
1819                                 if (!store_write_section(out_fd, new_name)) {
1820                                         ret = write_error(lock->filename);
1821                                         goto out;
1822                                 }
1823                                 /*
1824                                  * We wrote out the new section, with
1825                                  * a newline, now skip the old
1826                                  * section's length
1827                                  */
1828                                 output += offset + i;
1829                                 if (strlen(output) > 0) {
1830                                         /*
1831                                          * More content means there's
1832                                          * a declaration to put on the
1833                                          * next line; indent with a
1834                                          * tab
1835                                          */
1836                                         output -= 1;
1837                                         output[0] = '\t';
1838                                 }
1839                         }
1840                         remove = 0;
1841                 }
1842                 if (remove)
1843                         continue;
1844                 length = strlen(output);
1845                 if (write_in_full(out_fd, output, length) != length) {
1846                         ret = write_error(lock->filename);
1847                         goto out;
1848                 }
1849         }
1850         fclose(config_file);
1851 unlock_and_out:
1852         if (commit_lock_file(lock) < 0)
1853                 ret = error("could not commit config file %s", config_filename);
1854 out:
1855         free(filename_buf);
1856         return ret;
1857 }
1858
1859 int git_config_rename_section(const char *old_name, const char *new_name)
1860 {
1861         return git_config_rename_section_in_file(NULL, old_name, new_name);
1862 }
1863
1864 /*
1865  * Call this to report error for your variable that should not
1866  * get a boolean value (i.e. "[my] var" means "true").
1867  */
1868 #undef config_error_nonbool
1869 int config_error_nonbool(const char *var)
1870 {
1871         return error("Missing value for '%s'", var);
1872 }
1873
1874 int parse_config_key(const char *var,
1875                      const char *section,
1876                      const char **subsection, int *subsection_len,
1877                      const char **key)
1878 {
1879         int section_len = strlen(section);
1880         const char *dot;
1881
1882         /* Does it start with "section." ? */
1883         if (!starts_with(var, section) || var[section_len] != '.')
1884                 return -1;
1885
1886         /*
1887          * Find the key; we don't know yet if we have a subsection, but we must
1888          * parse backwards from the end, since the subsection may have dots in
1889          * it, too.
1890          */
1891         dot = strrchr(var, '.');
1892         *key = dot + 1;
1893
1894         /* Did we have a subsection at all? */
1895         if (dot == var + section_len) {
1896                 *subsection = NULL;
1897                 *subsection_len = 0;
1898         }
1899         else {
1900                 *subsection = var + section_len + 1;
1901                 *subsection_len = dot - *subsection;
1902         }
1903
1904         return 0;
1905 }