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         int die_on_error;
  25         int linenr;
  26         int eof;
  27         struct strbuf value;
  28         struct strbuf var;
  29
  30         int (*do_fgetc)(struct config_source *c);
  31         int (*do_ungetc)(int c, struct config_source *conf);
  32         long (*do_ftell)(struct config_source *c);
  33 };
  34
  35 static struct config_source *cf;
  36
  37 static int zlib_compression_seen;
  38
  39 static int config_file_fgetc(struct config_source *conf)
  40 {
  41         return fgetc(conf->u.file);
  42 }
  43
  44 static int config_file_ungetc(int c, struct config_source *conf)
  45 {
  46         return ungetc(c, conf->u.file);
  47 }
  48
  49 static long config_file_ftell(struct config_source *conf)
  50 {
  51         return ftell(conf->u.file);
  52 }
  53
  54
  55 static int config_buf_fgetc(struct config_source *conf)
  56 {
  57         if (conf->u.buf.pos < conf->u.buf.len)
  58                 return conf->u.buf.buf[conf->u.buf.pos++];
  59
  60         return EOF;
  61 }
  62
  63 static int config_buf_ungetc(int c, struct config_source *conf)
  64 {
  65         if (conf->u.buf.pos > 0)
  66                 return conf->u.buf.buf[--conf->u.buf.pos];
  67
  68         return EOF;
  69 }
  70
  71 static long config_buf_ftell(struct config_source *conf)
  72 {
  73         return conf->u.buf.pos;
  74 }
  75
  76 #define MAX_INCLUDE_DEPTH 10
  77 static const char include_depth_advice[] =
  78 "exceeded maximum include depth (%d) while including\n"
  79 "       %s\n"
  80 "from\n"
  81 "       %s\n"
  82 "Do you have circular includes?";
  83 static int handle_path_include(const char *path, struct config_include_data *inc)
  84 {
  85         int ret = 0;
  86         struct strbuf buf = STRBUF_INIT;
  87         char *expanded = expand_user_path(path);
  88
  89         if (!expanded)
  90                 return error("Could not expand include path '%s'", path);
  91         path = expanded;
  92
  93         /*
  94          * Use an absolute path as-is, but interpret relative paths
  95          * based on the including config file.
  96          */
  97         if (!is_absolute_path(path)) {
  98                 char *slash;
  99
 100                 if (!cf || !cf->name)
 101                         return error("relative config includes must come from files");
 102
 103                 slash = find_last_dir_sep(cf->name);
 104                 if (slash)
 105                         strbuf_add(&buf, cf->name, slash - cf->name + 1);
 106                 strbuf_addstr(&buf, path);
 107                 path = buf.buf;
 108         }
 109
 110         if (!access_or_die(path, R_OK, 0)) {
 111                 if (++inc->depth > MAX_INCLUDE_DEPTH)
 112                         die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
 113                             cf && cf->name ? cf->name : "the command line");
 114                 ret = git_config_from_file(git_config_include, path, inc);
 115                 inc->depth--;
 116         }
 117         strbuf_release(&buf);
 118         free(expanded);
 119         return ret;
 120 }
 121
 122 int git_config_include(const char *var, const char *value, void *data)
 123 {
 124         struct config_include_data *inc = data;
 125         const char *type;
 126         int ret;
 127
 128         /*
 129          * Pass along all values, including "include" directives; this makes it
 130          * possible to query information on the includes themselves.
 131          */
 132         ret = inc->fn(var, value, inc->data);
 133         if (ret < 0)
 134                 return ret;
 135
 136         type = skip_prefix(var, "include.");
 137         if (!type)
 138                 return ret;
 139
 140         if (!strcmp(type, "path"))
 141                 ret = handle_path_include(value, inc);
 142         return ret;
 143 }
 144
 145 static void lowercase(char *p)
 146 {
 147         for (; *p; p++)
 148                 *p = tolower(*p);
 149 }
 150
 151 void git_config_push_parameter(const char *text)
 152 {
 153         struct strbuf env = STRBUF_INIT;
 154         const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
 155         if (old) {
 156                 strbuf_addstr(&env, old);
 157                 strbuf_addch(&env, ' ');
 158         }
 159         sq_quote_buf(&env, text);
 160         setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
 161         strbuf_release(&env);
 162 }
 163
 164 int git_config_parse_parameter(const char *text,
 165                                config_fn_t fn, void *data)
 166 {
 167         struct strbuf **pair;
 168         pair = strbuf_split_str(text, '=', 2);
 169         if (!pair[0])
 170                 return error("bogus config parameter: %s", text);
 171         if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
 172                 strbuf_setlen(pair[0], pair[0]->len - 1);
 173         strbuf_trim(pair[0]);
 174         if (!pair[0]->len) {
 175                 strbuf_list_free(pair);
 176                 return error("bogus config parameter: %s", text);
 177         }
 178         lowercase(pair[0]->buf);
 179         if (fn(pair[0]->buf, pair[1] ? pair[1]->buf : NULL, data) < 0) {
 180                 strbuf_list_free(pair);
 181                 return -1;
 182         }
 183         strbuf_list_free(pair);
 184         return 0;
 185 }
 186
 187 int git_config_from_parameters(config_fn_t fn, void *data)
 188 {
 189         const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 190         char *envw;
 191         const char **argv = NULL;
 192         int nr = 0, alloc = 0;
 193         int i;
 194
 195         if (!env)
 196                 return 0;
 197         /* sq_dequote will write over it */
 198         envw = xstrdup(env);
 199
 200         if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 201                 free(envw);
 202                 return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
 203         }
 204
 205         for (i = 0; i < nr; i++) {
 206                 if (git_config_parse_parameter(argv[i], fn, data) < 0) {
 207                         free(argv);
 208                         free(envw);
 209                         return -1;
 210                 }
 211         }
 212
 213         free(argv);
 214         free(envw);
 215         return nr > 0;
 216 }
 217
 218 static int get_next_char(void)
 219 {
 220         int c = cf->do_fgetc(cf);
 221
 222         if (c == '\r') {
 223                 /* DOS like systems */
 224                 c = cf->do_fgetc(cf);
 225                 if (c != '\n') {
 226                         cf->do_ungetc(c, cf);
 227                         c = '\r';
 228                 }
 229         }
 230         if (c == '\n')
 231                 cf->linenr++;
 232         if (c == EOF) {
 233                 cf->eof = 1;
 234                 c = '\n';
 235         }
 236         return c;
 237 }
 238
 239 static char *parse_value(void)
 240 {
 241         int quote = 0, comment = 0, space = 0;
 242
 243         strbuf_reset(&cf->value);
 244         for (;;) {
 245                 int c = get_next_char();
 246                 if (c == '\n') {
 247                         if (quote) {
 248                                 cf->linenr--;
 249                                 return NULL;
 250                         }
 251                         return cf->value.buf;
 252                 }
 253                 if (comment)
 254                         continue;
 255                 if (isspace(c) && !quote) {
 256                         if (cf->value.len)
 257                                 space++;
 258                         continue;
 259                 }
 260                 if (!quote) {
 261                         if (c == ';' || c == '#') {
 262                                 comment = 1;
 263                                 continue;
 264                         }
 265                 }
 266                 for (; space; space--)
 267                         strbuf_addch(&cf->value, ' ');
 268                 if (c == '\\') {
 269                         c = get_next_char();
 270                         switch (c) {
 271                         case '\n':
 272                                 continue;
 273                         case 't':
 274                                 c = '\t';
 275                                 break;
 276                         case 'b':
 277                                 c = '\b';
 278                                 break;
 279                         case 'n':
 280                                 c = '\n';
 281                                 break;
 282                         /* Some characters escape as themselves */
 283                         case '\\': case '"':
 284                                 break;
 285                         /* Reject unknown escape sequences */
 286                         default:
 287                                 return NULL;
 288                         }
 289                         strbuf_addch(&cf->value, c);
 290                         continue;
 291                 }
 292                 if (c == '"') {
 293                         quote = 1-quote;
 294                         continue;
 295                 }
 296                 strbuf_addch(&cf->value, c);
 297         }
 298 }
 299
 300 static inline int iskeychar(int c)
 301 {
 302         return isalnum(c) || c == '-';
 303 }
 304
 305 static int get_value(config_fn_t fn, void *data, struct strbuf *name)
 306 {
 307         int c;
 308         char *value;
 309
 310         /* Get the full name */
 311         for (;;) {
 312                 c = get_next_char();
 313                 if (cf->eof)
 314                         break;
 315                 if (!iskeychar(c))
 316                         break;
 317                 strbuf_addch(name, tolower(c));
 318         }
 319
 320         while (c == ' ' || c == '\t')
 321                 c = get_next_char();
 322
 323         value = NULL;
 324         if (c != '\n') {
 325                 if (c != '=')
 326                         return -1;
 327                 value = parse_value();
 328                 if (!value)
 329                         return -1;
 330         }
 331         return fn(name->buf, value, data);
 332 }
 333
 334 static int get_extended_base_var(struct strbuf *name, int c)
 335 {
 336         do {
 337                 if (c == '\n')
 338                         goto error_incomplete_line;
 339                 c = get_next_char();
 340         } while (isspace(c));
 341
 342         /* We require the format to be '[base "extension"]' */
 343         if (c != '"')
 344                 return -1;
 345         strbuf_addch(name, '.');
 346
 347         for (;;) {
 348                 int c = get_next_char();
 349                 if (c == '\n')
 350                         goto error_incomplete_line;
 351                 if (c == '"')
 352                         break;
 353                 if (c == '\\') {
 354                         c = get_next_char();
 355                         if (c == '\n')
 356                                 goto error_incomplete_line;
 357                 }
 358                 strbuf_addch(name, c);
 359         }
 360
 361         /* Final ']' */
 362         if (get_next_char() != ']')
 363                 return -1;
 364         return 0;
 365 error_incomplete_line:
 366         cf->linenr--;
 367         return -1;
 368 }
 369
 370 static int get_base_var(struct strbuf *name)
 371 {
 372         for (;;) {
 373                 int c = get_next_char();
 374                 if (cf->eof)
 375                         return -1;
 376                 if (c == ']')
 377                         return 0;
 378                 if (isspace(c))
 379                         return get_extended_base_var(name, c);
 380                 if (!iskeychar(c) && c != '.')
 381                         return -1;
 382                 strbuf_addch(name, tolower(c));
 383         }
 384 }
 385
 386 static int git_parse_source(config_fn_t fn, void *data)
 387 {
 388         int comment = 0;
 389         int baselen = 0;
 390         struct strbuf *var = &cf->var;
 391
 392         /* U+FEFF Byte Order Mark in UTF8 */
 393         static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 394         const unsigned char *bomptr = utf8_bom;
 395
 396         for (;;) {
 397                 int c = get_next_char();
 398                 if (bomptr && *bomptr) {
 399                         /* We are at the file beginning; skip UTF8-encoded BOM
 400                          * if present. Sane editors won't put this in on their
 401                          * own, but e.g. Windows Notepad will do it happily. */
 402                         if ((unsigned char) c == *bomptr) {
 403                                 bomptr++;
 404                                 continue;
 405                         } else {
 406                                 /* Do not tolerate partial BOM. */
 407                                 if (bomptr != utf8_bom)
 408                                         break;
 409                                 /* No BOM at file beginning. Cool. */
 410                                 bomptr = NULL;
 411                         }
 412                 }
 413                 if (c == '\n') {
 414                         if (cf->eof)
 415                                 return 0;
 416                         comment = 0;
 417                         continue;
 418                 }
 419                 if (comment || isspace(c))
 420                         continue;
 421                 if (c == '#' || c == ';') {
 422                         comment = 1;
 423                         continue;
 424                 }
 425                 if (c == '[') {
 426                         /* Reset prior to determining a new stem */
 427                         strbuf_reset(var);
 428                         if (get_base_var(var) < 0 || var->len < 1)
 429                                 break;
 430                         strbuf_addch(var, '.');
 431                         baselen = var->len;
 432                         continue;
 433                 }
 434                 if (!isalpha(c))
 435                         break;
 436                 /*
 437                  * Truncate the var name back to the section header
 438                  * stem prior to grabbing the suffix part of the name
 439                  * and the value.
 440                  */
 441                 strbuf_setlen(var, baselen);
 442                 strbuf_addch(var, tolower(c));
 443                 if (get_value(fn, data, var) < 0)
 444                         break;
 445         }
 446         if (cf->die_on_error)
 447                 die("bad config file line %d in %s", cf->linenr, cf->name);
 448         else
 449                 return error("bad config file line %d in %s", cf->linenr, cf->name);
 450 }
 451
 452 static int parse_unit_factor(const char *end, uintmax_t *val)
 453 {
 454         if (!*end)
 455                 return 1;
 456         else if (!strcasecmp(end, "k")) {
 457                 *val *= 1024;
 458                 return 1;
 459         }
 460         else if (!strcasecmp(end, "m")) {
 461                 *val *= 1024 * 1024;
 462                 return 1;
 463         }
 464         else if (!strcasecmp(end, "g")) {
 465                 *val *= 1024 * 1024 * 1024;
 466                 return 1;
 467         }
 468         return 0;
 469 }
 470
 471 static int git_parse_signed(const char *value, intmax_t *ret, intmax_t max)
 472 {
 473         if (value && *value) {
 474                 char *end;
 475                 intmax_t val;
 476                 uintmax_t uval;
 477                 uintmax_t factor = 1;
 478
 479                 errno = 0;
 480                 val = strtoimax(value, &end, 0);
 481                 if (errno == ERANGE)
 482                         return 0;
 483                 if (!parse_unit_factor(end, &factor)) {
 484                         errno = EINVAL;
 485                         return 0;
 486                 }
 487                 uval = abs(val);
 488                 uval *= factor;
 489                 if (uval > max || abs(val) > uval) {
 490                         errno = ERANGE;
 491                         return 0;
 492                 }
 493                 val *= factor;
 494                 *ret = val;
 495                 return 1;
 496         }
 497         errno = EINVAL;
 498         return 0;
 499 }
 500
 501 static int git_parse_unsigned(const char *value, uintmax_t *ret, uintmax_t max)
 502 {
 503         if (value && *value) {
 504                 char *end;
 505                 uintmax_t val;
 506                 uintmax_t oldval;
 507
 508                 errno = 0;
 509                 val = strtoumax(value, &end, 0);
 510                 if (errno == ERANGE)
 511                         return 0;
 512                 oldval = val;
 513                 if (!parse_unit_factor(end, &val)) {
 514                         errno = EINVAL;
 515                         return 0;
 516                 }
 517                 if (val > max || oldval > val) {
 518                         errno = ERANGE;
 519                         return 0;
 520                 }
 521                 *ret = val;
 522                 return 1;
 523         }
 524         errno = EINVAL;
 525         return 0;
 526 }
 527
 528 static int git_parse_int(const char *value, int *ret)
 529 {
 530         intmax_t tmp;
 531         if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int)))
 532                 return 0;
 533         *ret = tmp;
 534         return 1;
 535 }
 536
 537 static int git_parse_int64(const char *value, int64_t *ret)
 538 {
 539         intmax_t tmp;
 540         if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int64_t)))
 541                 return 0;
 542         *ret = tmp;
 543         return 1;
 544 }
 545
 546 int git_parse_ulong(const char *value, unsigned long *ret)
 547 {
 548         uintmax_t tmp;
 549         if (!git_parse_unsigned(value, &tmp, maximum_unsigned_value_of_type(long)))
 550                 return 0;
 551         *ret = tmp;
 552         return 1;
 553 }
 554
 555 NORETURN
 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 (!prefixcmp(var, "core."))
 974                 return git_default_core_config(var, value);
 975
 976         if (!prefixcmp(var, "user."))
 977                 return git_ident_config(var, value, dummy);
 978
 979         if (!prefixcmp(var, "i18n."))
 980                 return git_default_i18n_config(var, value);
 981
 982         if (!prefixcmp(var, "branch."))
 983                 return git_default_branch_config(var, value);
 984
 985         if (!prefixcmp(var, "push."))
 986                 return git_default_push_config(var, value);
 987
 988         if (!prefixcmp(var, "mailmap."))
 989                 return git_default_mailmap_config(var, value);
 990
 991         if (!prefixcmp(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 = 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.die_on_error = 0;
1067         top.do_fgetc = config_buf_fgetc;
1068         top.do_ungetc = config_buf_ungetc;
1069         top.do_ftell = config_buf_ftell;
1070
1071         return do_config_from(&top, fn, data);
1072 }
1073
1074 static int git_config_from_blob_sha1(config_fn_t fn,
1075                                      const char *name,
1076                                      const unsigned char *sha1,
1077                                      void *data)
1078 {
1079         enum object_type type;
1080         char *buf;
1081         unsigned long size;
1082         int ret;
1083
1084         buf = read_sha1_file(sha1, &type, &size);
1085         if (!buf)
1086                 return error("unable to load config blob object '%s'", name);
1087         if (type != OBJ_BLOB) {
1088                 free(buf);
1089                 return error("reference '%s' does not point to a blob", name);
1090         }
1091
1092         ret = git_config_from_buf(fn, name, buf, size, data);
1093         free(buf);
1094
1095         return ret;
1096 }
1097
1098 static int git_config_from_blob_ref(config_fn_t fn,
1099                                     const char *name,
1100                                     void *data)
1101 {
1102         unsigned char sha1[20];
1103
1104         if (get_sha1(name, sha1) < 0)
1105                 return error("unable to resolve config blob '%s'", name);
1106         return git_config_from_blob_sha1(fn, name, sha1, data);
1107 }
1108
1109 const char *git_etc_gitconfig(void)
1110 {
1111         static const char *system_wide;
1112         if (!system_wide)
1113                 system_wide = system_path(ETC_GITCONFIG);
1114         return system_wide;
1115 }
1116
1117 int git_env_bool(const char *k, int def)
1118 {
1119         const char *v = getenv(k);
1120         return v ? git_config_bool(k, v) : def;
1121 }
1122
1123 int git_config_system(void)
1124 {
1125         return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
1126 }
1127
1128 int git_config_early(config_fn_t fn, void *data, const char *repo_config)
1129 {
1130         int ret = 0, found = 0;
1131         char *xdg_config = NULL;
1132         char *user_config = NULL;
1133
1134         home_config_paths(&user_config, &xdg_config, "config");
1135
1136         if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0)) {
1137                 ret += git_config_from_file(fn, git_etc_gitconfig(),
1138                                             data);
1139                 found += 1;
1140         }
1141
1142         if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK)) {
1143                 ret += git_config_from_file(fn, xdg_config, data);
1144                 found += 1;
1145         }
1146
1147         if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK)) {
1148                 ret += git_config_from_file(fn, user_config, data);
1149                 found += 1;
1150         }
1151
1152         if (repo_config && !access_or_die(repo_config, R_OK, 0)) {
1153                 ret += git_config_from_file(fn, repo_config, data);
1154                 found += 1;
1155         }
1156
1157         switch (git_config_from_parameters(fn, data)) {
1158         case -1: /* error */
1159                 die("unable to parse command-line config");
1160                 break;
1161         case 0: /* found nothing */
1162                 break;
1163         default: /* found at least one item */
1164                 found++;
1165                 break;
1166         }
1167
1168         free(xdg_config);
1169         free(user_config);
1170         return ret == 0 ? found : ret;
1171 }
1172
1173 int git_config_with_options(config_fn_t fn, void *data,
1174                             const char *filename,
1175                             const char *blob_ref,
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 (filename)
1194                 return git_config_from_file(fn, filename, data);
1195         else if (blob_ref)
1196                 return git_config_from_blob_ref(fn, blob_ref, 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, NULL, 1);
1208 }
1209
1210 /*
1211  * Find all the stuff for git_config_set() below.
1212  */
1213
1214 #define MAX_MATCHES 512
1215
1216 static struct {
1217         int baselen;
1218         char *key;
1219         int do_not_match;
1220         regex_t *value_regex;
1221         int multi_replace;
1222         size_t offset[MAX_MATCHES];
1223         enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1224         int seen;
1225 } store;
1226
1227 static int matches(const char *key, const char *value)
1228 {
1229         return !strcmp(key, store.key) &&
1230                 (store.value_regex == NULL ||
1231                  (store.do_not_match ^
1232                   !regexec(store.value_regex, value, 0, NULL, 0)));
1233 }
1234
1235 static int store_aux(const char *key, const char *value, void *cb)
1236 {
1237         const char *ep;
1238         size_t section_len;
1239
1240         switch (store.state) {
1241         case KEY_SEEN:
1242                 if (matches(key, value)) {
1243                         if (store.seen == 1 && store.multi_replace == 0) {
1244                                 warning("%s has multiple values", key);
1245                         } else if (store.seen >= MAX_MATCHES) {
1246                                 error("too many matches for %s", key);
1247                                 return 1;
1248                         }
1249
1250                         store.offset[store.seen] = cf->do_ftell(cf);
1251                         store.seen++;
1252                 }
1253                 break;
1254         case SECTION_SEEN:
1255                 /*
1256                  * What we are looking for is in store.key (both
1257                  * section and var), and its section part is baselen
1258                  * long.  We found key (again, both section and var).
1259                  * We would want to know if this key is in the same
1260                  * section as what we are looking for.  We already
1261                  * know we are in the same section as what should
1262                  * hold store.key.
1263                  */
1264                 ep = strrchr(key, '.');
1265                 section_len = ep - key;
1266
1267                 if ((section_len != store.baselen) ||
1268                     memcmp(key, store.key, section_len+1)) {
1269                         store.state = SECTION_END_SEEN;
1270                         break;
1271                 }
1272
1273                 /*
1274                  * Do not increment matches: this is no match, but we
1275                  * just made sure we are in the desired section.
1276                  */
1277                 store.offset[store.seen] = cf->do_ftell(cf);
1278                 /* fallthru */
1279         case SECTION_END_SEEN:
1280         case START:
1281                 if (matches(key, value)) {
1282                         store.offset[store.seen] = cf->do_ftell(cf);
1283                         store.state = KEY_SEEN;
1284                         store.seen++;
1285                 } else {
1286                         if (strrchr(key, '.') - key == store.baselen &&
1287                               !strncmp(key, store.key, store.baselen)) {
1288                                         store.state = SECTION_SEEN;
1289                                         store.offset[store.seen] = cf->do_ftell(cf);
1290                         }
1291                 }
1292         }
1293         return 0;
1294 }
1295
1296 static int write_error(const char *filename)
1297 {
1298         error("failed to write new configuration file %s", filename);
1299
1300         /* Same error code as "failed to rename". */
1301         return 4;
1302 }
1303
1304 static int store_write_section(int fd, const char *key)
1305 {
1306         const char *dot;
1307         int i, success;
1308         struct strbuf sb = STRBUF_INIT;
1309
1310         dot = memchr(key, '.', store.baselen);
1311         if (dot) {
1312                 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1313                 for (i = dot - key + 1; i < store.baselen; i++) {
1314                         if (key[i] == '"' || key[i] == '\\')
1315                                 strbuf_addch(&sb, '\\');
1316                         strbuf_addch(&sb, key[i]);
1317                 }
1318                 strbuf_addstr(&sb, "\"]\n");
1319         } else {
1320                 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1321         }
1322
1323         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1324         strbuf_release(&sb);
1325
1326         return success;
1327 }
1328
1329 static int store_write_pair(int fd, const char *key, const char *value)
1330 {
1331         int i, success;
1332         int length = strlen(key + store.baselen + 1);
1333         const char *quote = "";
1334         struct strbuf sb = STRBUF_INIT;
1335
1336         /*
1337          * Check to see if the value needs to be surrounded with a dq pair.
1338          * Note that problematic characters are always backslash-quoted; this
1339          * check is about not losing leading or trailing SP and strings that
1340          * follow beginning-of-comment characters (i.e. ';' and '#') by the
1341          * configuration parser.
1342          */
1343         if (value[0] == ' ')
1344                 quote = "\"";
1345         for (i = 0; value[i]; i++)
1346                 if (value[i] == ';' || value[i] == '#')
1347                         quote = "\"";
1348         if (i && value[i - 1] == ' ')
1349                 quote = "\"";
1350
1351         strbuf_addf(&sb, "\t%.*s = %s",
1352                     length, key + store.baselen + 1, quote);
1353
1354         for (i = 0; value[i]; i++)
1355                 switch (value[i]) {
1356                 case '\n':
1357                         strbuf_addstr(&sb, "\\n");
1358                         break;
1359                 case '\t':
1360                         strbuf_addstr(&sb, "\\t");
1361                         break;
1362                 case '"':
1363                 case '\\':
1364                         strbuf_addch(&sb, '\\');
1365                 default:
1366                         strbuf_addch(&sb, value[i]);
1367                         break;
1368                 }
1369         strbuf_addf(&sb, "%s\n", quote);
1370
1371         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1372         strbuf_release(&sb);
1373
1374         return success;
1375 }
1376
1377 static ssize_t find_beginning_of_line(const char *contents, size_t size,
1378         size_t offset_, int *found_bracket)
1379 {
1380         size_t equal_offset = size, bracket_offset = size;
1381         ssize_t offset;
1382
1383 contline:
1384         for (offset = offset_-2; offset > 0
1385                         && contents[offset] != '\n'; offset--)
1386                 switch (contents[offset]) {
1387                         case '=': equal_offset = offset; break;
1388                         case ']': bracket_offset = offset; break;
1389                 }
1390         if (offset > 0 && contents[offset-1] == '\\') {
1391                 offset_ = offset;
1392                 goto contline;
1393         }
1394         if (bracket_offset < equal_offset) {
1395                 *found_bracket = 1;
1396                 offset = bracket_offset+1;
1397         } else
1398                 offset++;
1399
1400         return offset;
1401 }
1402
1403 int git_config_set_in_file(const char *config_filename,
1404                         const char *key, const char *value)
1405 {
1406         return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1407 }
1408
1409 int git_config_set(const char *key, const char *value)
1410 {
1411         return git_config_set_multivar(key, value, NULL, 0);
1412 }
1413
1414 /*
1415  * Auxiliary function to sanity-check and split the key into the section
1416  * identifier and variable name.
1417  *
1418  * Returns 0 on success, -1 when there is an invalid character in the key and
1419  * -2 if there is no section name in the key.
1420  *
1421  * store_key - pointer to char* which will hold a copy of the key with
1422  *             lowercase section and variable name
1423  * baselen - pointer to int which will hold the length of the
1424  *           section + subsection part, can be NULL
1425  */
1426 int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1427 {
1428         int i, dot, baselen;
1429         const char *last_dot = strrchr(key, '.');
1430
1431         /*
1432          * Since "key" actually contains the section name and the real
1433          * key name separated by a dot, we have to know where the dot is.
1434          */
1435
1436         if (last_dot == NULL || last_dot == key) {
1437                 error("key does not contain a section: %s", key);
1438                 return -CONFIG_NO_SECTION_OR_NAME;
1439         }
1440
1441         if (!last_dot[1]) {
1442                 error("key does not contain variable name: %s", key);
1443                 return -CONFIG_NO_SECTION_OR_NAME;
1444         }
1445
1446         baselen = last_dot - key;
1447         if (baselen_)
1448                 *baselen_ = baselen;
1449
1450         /*
1451          * Validate the key and while at it, lower case it for matching.
1452          */
1453         *store_key = xmalloc(strlen(key) + 1);
1454
1455         dot = 0;
1456         for (i = 0; key[i]; i++) {
1457                 unsigned char c = key[i];
1458                 if (c == '.')
1459                         dot = 1;
1460                 /* Leave the extended basename untouched.. */
1461                 if (!dot || i > baselen) {
1462                         if (!iskeychar(c) ||
1463                             (i == baselen + 1 && !isalpha(c))) {
1464                                 error("invalid key: %s", key);
1465                                 goto out_free_ret_1;
1466                         }
1467                         c = tolower(c);
1468                 } else if (c == '\n') {
1469                         error("invalid key (newline): %s", key);
1470                         goto out_free_ret_1;
1471                 }
1472                 (*store_key)[i] = c;
1473         }
1474         (*store_key)[i] = 0;
1475
1476         return 0;
1477
1478 out_free_ret_1:
1479         free(*store_key);
1480         *store_key = NULL;
1481         return -CONFIG_INVALID_KEY;
1482 }
1483
1484 /*
1485  * If value==NULL, unset in (remove from) config,
1486  * if value_regex!=NULL, disregard key/value pairs where value does not match.
1487  * if multi_replace==0, nothing, or only one matching key/value is replaced,
1488  *     else all matching key/values (regardless how many) are removed,
1489  *     before the new pair is written.
1490  *
1491  * Returns 0 on success.
1492  *
1493  * This function does this:
1494  *
1495  * - it locks the config file by creating ".git/config.lock"
1496  *
1497  * - it then parses the config using store_aux() as validator to find
1498  *   the position on the key/value pair to replace. If it is to be unset,
1499  *   it must be found exactly once.
1500  *
1501  * - the config file is mmap()ed and the part before the match (if any) is
1502  *   written to the lock file, then the changed part and the rest.
1503  *
1504  * - the config file is removed and the lock file rename()d to it.
1505  *
1506  */
1507 int git_config_set_multivar_in_file(const char *config_filename,
1508                                 const char *key, const char *value,
1509                                 const char *value_regex, int multi_replace)
1510 {
1511         int fd = -1, in_fd;
1512         int ret;
1513         struct lock_file *lock = NULL;
1514         char *filename_buf = NULL;
1515
1516         /* parse-key returns negative; flip the sign to feed exit(3) */
1517         ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1518         if (ret)
1519                 goto out_free;
1520
1521         store.multi_replace = multi_replace;
1522
1523         if (!config_filename)
1524                 config_filename = filename_buf = git_pathdup("config");
1525
1526         /*
1527          * The lock serves a purpose in addition to locking: the new
1528          * contents of .git/config will be written into it.
1529          */
1530         lock = xcalloc(sizeof(struct lock_file), 1);
1531         fd = hold_lock_file_for_update(lock, config_filename, 0);
1532         if (fd < 0) {
1533                 error("could not lock config file %s: %s", config_filename, strerror(errno));
1534                 free(store.key);
1535                 ret = CONFIG_NO_LOCK;
1536                 goto out_free;
1537         }
1538
1539         /*
1540          * If .git/config does not exist yet, write a minimal version.
1541          */
1542         in_fd = open(config_filename, O_RDONLY);
1543         if ( in_fd < 0 ) {
1544                 free(store.key);
1545
1546                 if ( ENOENT != errno ) {
1547                         error("opening %s: %s", config_filename,
1548                               strerror(errno));
1549                         ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1550                         goto out_free;
1551                 }
1552                 /* if nothing to unset, error out */
1553                 if (value == NULL) {
1554                         ret = CONFIG_NOTHING_SET;
1555                         goto out_free;
1556                 }
1557
1558                 store.key = (char *)key;
1559                 if (!store_write_section(fd, key) ||
1560                     !store_write_pair(fd, key, value))
1561                         goto write_err_out;
1562         } else {
1563                 struct stat st;
1564                 char *contents;
1565                 size_t contents_sz, copy_begin, copy_end;
1566                 int i, new_line = 0;
1567
1568                 if (value_regex == NULL)
1569                         store.value_regex = NULL;
1570                 else {
1571                         if (value_regex[0] == '!') {
1572                                 store.do_not_match = 1;
1573                                 value_regex++;
1574                         } else
1575                                 store.do_not_match = 0;
1576
1577                         store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1578                         if (regcomp(store.value_regex, value_regex,
1579                                         REG_EXTENDED)) {
1580                                 error("invalid pattern: %s", value_regex);
1581                                 free(store.value_regex);
1582                                 ret = CONFIG_INVALID_PATTERN;
1583                                 goto out_free;
1584                         }
1585                 }
1586
1587                 store.offset[0] = 0;
1588                 store.state = START;
1589                 store.seen = 0;
1590
1591                 /*
1592                  * After this, store.offset will contain the *end* offset
1593                  * of the last match, or remain at 0 if no match was found.
1594                  * As a side effect, we make sure to transform only a valid
1595                  * existing config file.
1596                  */
1597                 if (git_config_from_file(store_aux, config_filename, NULL)) {
1598                         error("invalid config file %s", config_filename);
1599                         free(store.key);
1600                         if (store.value_regex != NULL) {
1601                                 regfree(store.value_regex);
1602                                 free(store.value_regex);
1603                         }
1604                         ret = CONFIG_INVALID_FILE;
1605                         goto out_free;
1606                 }
1607
1608                 free(store.key);
1609                 if (store.value_regex != NULL) {
1610                         regfree(store.value_regex);
1611                         free(store.value_regex);
1612                 }
1613
1614                 /* if nothing to unset, or too many matches, error out */
1615                 if ((store.seen == 0 && value == NULL) ||
1616                                 (store.seen > 1 && multi_replace == 0)) {
1617                         ret = CONFIG_NOTHING_SET;
1618                         goto out_free;
1619                 }
1620
1621                 fstat(in_fd, &st);
1622                 contents_sz = xsize_t(st.st_size);
1623                 contents = xmmap(NULL, contents_sz, PROT_READ,
1624                         MAP_PRIVATE, in_fd, 0);
1625                 close(in_fd);
1626
1627                 if (store.seen == 0)
1628                         store.seen = 1;
1629
1630                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1631                         if (store.offset[i] == 0) {
1632                                 store.offset[i] = copy_end = contents_sz;
1633                         } else if (store.state != KEY_SEEN) {
1634                                 copy_end = store.offset[i];
1635                         } else
1636                                 copy_end = find_beginning_of_line(
1637                                         contents, contents_sz,
1638                                         store.offset[i]-2, &new_line);
1639
1640                         if (copy_end > 0 && contents[copy_end-1] != '\n')
1641                                 new_line = 1;
1642
1643                         /* write the first part of the config */
1644                         if (copy_end > copy_begin) {
1645                                 if (write_in_full(fd, contents + copy_begin,
1646                                                   copy_end - copy_begin) <
1647                                     copy_end - copy_begin)
1648                                         goto write_err_out;
1649                                 if (new_line &&
1650                                     write_str_in_full(fd, "\n") != 1)
1651                                         goto write_err_out;
1652                         }
1653                         copy_begin = store.offset[i];
1654                 }
1655
1656                 /* write the pair (value == NULL means unset) */
1657                 if (value != NULL) {
1658                         if (store.state == START) {
1659                                 if (!store_write_section(fd, key))
1660                                         goto write_err_out;
1661                         }
1662                         if (!store_write_pair(fd, key, value))
1663                                 goto write_err_out;
1664                 }
1665
1666                 /* write the rest of the config */
1667                 if (copy_begin < contents_sz)
1668                         if (write_in_full(fd, contents + copy_begin,
1669                                           contents_sz - copy_begin) <
1670                             contents_sz - copy_begin)
1671                                 goto write_err_out;
1672
1673                 munmap(contents, contents_sz);
1674         }
1675
1676         if (commit_lock_file(lock) < 0) {
1677                 error("could not commit config file %s", config_filename);
1678                 ret = CONFIG_NO_WRITE;
1679                 goto out_free;
1680         }
1681
1682         /*
1683          * lock is committed, so don't try to roll it back below.
1684          * NOTE: Since lockfile.c keeps a linked list of all created
1685          * lock_file structures, it isn't safe to free(lock).  It's
1686          * better to just leave it hanging around.
1687          */
1688         lock = NULL;
1689         ret = 0;
1690
1691 out_free:
1692         if (lock)
1693                 rollback_lock_file(lock);
1694         free(filename_buf);
1695         return ret;
1696
1697 write_err_out:
1698         ret = write_error(lock->filename);
1699         goto out_free;
1700
1701 }
1702
1703 int git_config_set_multivar(const char *key, const char *value,
1704                         const char *value_regex, int multi_replace)
1705 {
1706         return git_config_set_multivar_in_file(NULL, key, value, value_regex,
1707                                                multi_replace);
1708 }
1709
1710 static int section_name_match (const char *buf, const char *name)
1711 {
1712         int i = 0, j = 0, dot = 0;
1713         if (buf[i] != '[')
1714                 return 0;
1715         for (i = 1; buf[i] && buf[i] != ']'; i++) {
1716                 if (!dot && isspace(buf[i])) {
1717                         dot = 1;
1718                         if (name[j++] != '.')
1719                                 break;
1720                         for (i++; isspace(buf[i]); i++)
1721                                 ; /* do nothing */
1722                         if (buf[i] != '"')
1723                                 break;
1724                         continue;
1725                 }
1726                 if (buf[i] == '\\' && dot)
1727                         i++;
1728                 else if (buf[i] == '"' && dot) {
1729                         for (i++; isspace(buf[i]); i++)
1730                                 ; /* do_nothing */
1731                         break;
1732                 }
1733                 if (buf[i] != name[j++])
1734                         break;
1735         }
1736         if (buf[i] == ']' && name[j] == 0) {
1737                 /*
1738                  * We match, now just find the right length offset by
1739                  * gobbling up any whitespace after it, as well
1740                  */
1741                 i++;
1742                 for (; buf[i] && isspace(buf[i]); i++)
1743                         ; /* do nothing */
1744                 return i;
1745         }
1746         return 0;
1747 }
1748
1749 static int section_name_is_ok(const char *name)
1750 {
1751         /* Empty section names are bogus. */
1752         if (!*name)
1753                 return 0;
1754
1755         /*
1756          * Before a dot, we must be alphanumeric or dash. After the first dot,
1757          * anything goes, so we can stop checking.
1758          */
1759         for (; *name && *name != '.'; name++)
1760                 if (*name != '-' && !isalnum(*name))
1761                         return 0;
1762         return 1;
1763 }
1764
1765 /* if new_name == NULL, the section is removed instead */
1766 int git_config_rename_section_in_file(const char *config_filename,
1767                                       const char *old_name, const char *new_name)
1768 {
1769         int ret = 0, remove = 0;
1770         char *filename_buf = NULL;
1771         struct lock_file *lock;
1772         int out_fd;
1773         char buf[1024];
1774         FILE *config_file;
1775
1776         if (new_name && !section_name_is_ok(new_name)) {
1777                 ret = error("invalid section name: %s", new_name);
1778                 goto out;
1779         }
1780
1781         if (!config_filename)
1782                 config_filename = filename_buf = git_pathdup("config");
1783
1784         lock = xcalloc(sizeof(struct lock_file), 1);
1785         out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1786         if (out_fd < 0) {
1787                 ret = error("could not lock config file %s", config_filename);
1788                 goto out;
1789         }
1790
1791         if (!(config_file = fopen(config_filename, "rb"))) {
1792                 /* no config file means nothing to rename, no error */
1793                 goto unlock_and_out;
1794         }
1795
1796         while (fgets(buf, sizeof(buf), config_file)) {
1797                 int i;
1798                 int length;
1799                 char *output = buf;
1800                 for (i = 0; buf[i] && isspace(buf[i]); i++)
1801                         ; /* do nothing */
1802                 if (buf[i] == '[') {
1803                         /* it's a section */
1804                         int offset = section_name_match(&buf[i], old_name);
1805                         if (offset > 0) {
1806                                 ret++;
1807                                 if (new_name == NULL) {
1808                                         remove = 1;
1809                                         continue;
1810                                 }
1811                                 store.baselen = strlen(new_name);
1812                                 if (!store_write_section(out_fd, new_name)) {
1813                                         ret = write_error(lock->filename);
1814                                         goto out;
1815                                 }
1816                                 /*
1817                                  * We wrote out the new section, with
1818                                  * a newline, now skip the old
1819                                  * section's length
1820                                  */
1821                                 output += offset + i;
1822                                 if (strlen(output) > 0) {
1823                                         /*
1824                                          * More content means there's
1825                                          * a declaration to put on the
1826                                          * next line; indent with a
1827                                          * tab
1828                                          */
1829                                         output -= 1;
1830                                         output[0] = '\t';
1831                                 }
1832                         }
1833                         remove = 0;
1834                 }
1835                 if (remove)
1836                         continue;
1837                 length = strlen(output);
1838                 if (write_in_full(out_fd, output, length) != length) {
1839                         ret = write_error(lock->filename);
1840                         goto out;
1841                 }
1842         }
1843         fclose(config_file);
1844 unlock_and_out:
1845         if (commit_lock_file(lock) < 0)
1846                 ret = error("could not commit config file %s", config_filename);
1847 out:
1848         free(filename_buf);
1849         return ret;
1850 }
1851
1852 int git_config_rename_section(const char *old_name, const char *new_name)
1853 {
1854         return git_config_rename_section_in_file(NULL, old_name, new_name);
1855 }
1856
1857 /*
1858  * Call this to report error for your variable that should not
1859  * get a boolean value (i.e. "[my] var" means "true").
1860  */
1861 #undef config_error_nonbool
1862 int config_error_nonbool(const char *var)
1863 {
1864         return error("Missing value for '%s'", var);
1865 }
1866
1867 int parse_config_key(const char *var,
1868                      const char *section,
1869                      const char **subsection, int *subsection_len,
1870                      const char **key)
1871 {
1872         int section_len = strlen(section);
1873         const char *dot;
1874
1875         /* Does it start with "section." ? */
1876         if (prefixcmp(var, section) || var[section_len] != '.')
1877                 return -1;
1878
1879         /*
1880          * Find the key; we don't know yet if we have a subsection, but we must
1881          * parse backwards from the end, since the subsection may have dots in
1882          * it, too.
1883          */
1884         dot = strrchr(var, '.');
1885         *key = dot + 1;
1886
1887         /* Did we have a subsection at all? */
1888         if (dot == var + section_len) {
1889                 *subsection = NULL;
1890                 *subsection_len = 0;
1891         }
1892         else {
1893                 *subsection = var + section_len + 1;
1894                 *subsection_len = dot - *subsection;
1895         }
1896
1897         return 0;
1898 }