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 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 static void die_bad_number(const char *name, const char *value)
 556 {
 557         const char *reason = errno == ERANGE ?
 558                              "out of range" :
 559                              "invalid unit";
 560         if (!value)
 561                 value = "";
 562
 563         if (cf && cf->name)
 564                 die("bad numeric config value '%s' for '%s' in %s: %s",
 565                     value, name, cf->name, reason);
 566         die("bad numeric config value '%s' for '%s': %s", value, name, reason);
 567 }
 568
 569 int git_config_int(const char *name, const char *value)
 570 {
 571         int ret;
 572         if (!git_parse_int(value, &ret))
 573                 die_bad_number(name, value);
 574         return ret;
 575 }
 576
 577 int64_t git_config_int64(const char *name, const char *value)
 578 {
 579         int64_t ret;
 580         if (!git_parse_int64(value, &ret))
 581                 die_bad_number(name, value);
 582         return ret;
 583 }
 584
 585 unsigned long git_config_ulong(const char *name, const char *value)
 586 {
 587         unsigned long ret;
 588         if (!git_parse_ulong(value, &ret))
 589                 die_bad_number(name, value);
 590         return ret;
 591 }
 592
 593 static int git_config_maybe_bool_text(const char *name, const char *value)
 594 {
 595         if (!value)
 596                 return 1;
 597         if (!*value)
 598                 return 0;
 599         if (!strcasecmp(value, "true")
 600             || !strcasecmp(value, "yes")
 601             || !strcasecmp(value, "on"))
 602                 return 1;
 603         if (!strcasecmp(value, "false")
 604             || !strcasecmp(value, "no")
 605             || !strcasecmp(value, "off"))
 606                 return 0;
 607         return -1;
 608 }
 609
 610 int git_config_maybe_bool(const char *name, const char *value)
 611 {
 612         int v = git_config_maybe_bool_text(name, value);
 613         if (0 <= v)
 614                 return v;
 615         if (git_parse_int(value, &v))
 616                 return !!v;
 617         return -1;
 618 }
 619
 620 int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 621 {
 622         int v = git_config_maybe_bool_text(name, value);
 623         if (0 <= v) {
 624                 *is_bool = 1;
 625                 return v;
 626         }
 627         *is_bool = 0;
 628         return git_config_int(name, value);
 629 }
 630
 631 int git_config_bool(const char *name, const char *value)
 632 {
 633         int discard;
 634         return !!git_config_bool_or_int(name, value, &discard);
 635 }
 636
 637 int git_config_string(const char **dest, const char *var, const char *value)
 638 {
 639         if (!value)
 640                 return config_error_nonbool(var);
 641         *dest = xstrdup(value);
 642         return 0;
 643 }
 644
 645 int git_config_pathname(const char **dest, const char *var, const char *value)
 646 {
 647         if (!value)
 648                 return config_error_nonbool(var);
 649         *dest = expand_user_path(value);
 650         if (!*dest)
 651                 die("Failed to expand user dir in: '%s'", value);
 652         return 0;
 653 }
 654
 655 static int git_default_core_config(const char *var, const char *value)
 656 {
 657         /* This needs a better name */
 658         if (!strcmp(var, "core.filemode")) {
 659                 trust_executable_bit = git_config_bool(var, value);
 660                 return 0;
 661         }
 662         if (!strcmp(var, "core.trustctime")) {
 663                 trust_ctime = git_config_bool(var, value);
 664                 return 0;
 665         }
 666         if (!strcmp(var, "core.statinfo") ||
 667             !strcmp(var, "core.checkstat")) {
 668                 /*
 669                  * NEEDSWORK: statinfo was a typo in v1.8.2 that has
 670                  * never been advertised.  we will remove it at Git
 671                  * 2.0 boundary.
 672                  */
 673                 if (!strcmp(var, "core.statinfo")) {
 674                         static int warned;
 675                         if (!warned++) {
 676                                 warning("'core.statinfo' will be removed in Git 2.0; "
 677                                         "use 'core.checkstat' instead.");
 678                         }
 679                 }
 680                 if (!strcasecmp(value, "default"))
 681                         check_stat = 1;
 682                 else if (!strcasecmp(value, "minimal"))
 683                         check_stat = 0;
 684         }
 685
 686         if (!strcmp(var, "core.quotepath")) {
 687                 quote_path_fully = git_config_bool(var, value);
 688                 return 0;
 689         }
 690
 691         if (!strcmp(var, "core.symlinks")) {
 692                 has_symlinks = git_config_bool(var, value);
 693                 return 0;
 694         }
 695
 696         if (!strcmp(var, "core.ignorecase")) {
 697                 ignore_case = git_config_bool(var, value);
 698                 return 0;
 699         }
 700
 701         if (!strcmp(var, "core.attributesfile"))
 702                 return git_config_pathname(&git_attributes_file, var, value);
 703
 704         if (!strcmp(var, "core.bare")) {
 705                 is_bare_repository_cfg = git_config_bool(var, value);
 706                 return 0;
 707         }
 708
 709         if (!strcmp(var, "core.ignorestat")) {
 710                 assume_unchanged = git_config_bool(var, value);
 711                 return 0;
 712         }
 713
 714         if (!strcmp(var, "core.prefersymlinkrefs")) {
 715                 prefer_symlink_refs = git_config_bool(var, value);
 716                 return 0;
 717         }
 718
 719         if (!strcmp(var, "core.logallrefupdates")) {
 720                 log_all_ref_updates = git_config_bool(var, value);
 721                 return 0;
 722         }
 723
 724         if (!strcmp(var, "core.warnambiguousrefs")) {
 725                 warn_ambiguous_refs = git_config_bool(var, value);
 726                 return 0;
 727         }
 728
 729         if (!strcmp(var, "core.abbrev")) {
 730                 int abbrev = git_config_int(var, value);
 731                 if (abbrev < minimum_abbrev || abbrev > 40)
 732                         return -1;
 733                 default_abbrev = abbrev;
 734                 return 0;
 735         }
 736
 737         if (!strcmp(var, "core.loosecompression")) {
 738                 int level = git_config_int(var, value);
 739                 if (level == -1)
 740                         level = Z_DEFAULT_COMPRESSION;
 741                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 742                         die("bad zlib compression level %d", level);
 743                 zlib_compression_level = level;
 744                 zlib_compression_seen = 1;
 745                 return 0;
 746         }
 747
 748         if (!strcmp(var, "core.compression")) {
 749                 int level = git_config_int(var, value);
 750                 if (level == -1)
 751                         level = Z_DEFAULT_COMPRESSION;
 752                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 753                         die("bad zlib compression level %d", level);
 754                 core_compression_level = level;
 755                 core_compression_seen = 1;
 756                 if (!zlib_compression_seen)
 757                         zlib_compression_level = level;
 758                 return 0;
 759         }
 760
 761         if (!strcmp(var, "core.packedgitwindowsize")) {
 762                 int pgsz_x2 = getpagesize() * 2;
 763                 packed_git_window_size = git_config_ulong(var, value);
 764
 765                 /* This value must be multiple of (pagesize * 2) */
 766                 packed_git_window_size /= pgsz_x2;
 767                 if (packed_git_window_size < 1)
 768                         packed_git_window_size = 1;
 769                 packed_git_window_size *= pgsz_x2;
 770                 return 0;
 771         }
 772
 773         if (!strcmp(var, "core.bigfilethreshold")) {
 774                 big_file_threshold = git_config_ulong(var, value);
 775                 return 0;
 776         }
 777
 778         if (!strcmp(var, "core.packedgitlimit")) {
 779                 packed_git_limit = git_config_ulong(var, value);
 780                 return 0;
 781         }
 782
 783         if (!strcmp(var, "core.deltabasecachelimit")) {
 784                 delta_base_cache_limit = git_config_ulong(var, value);
 785                 return 0;
 786         }
 787
 788         if (!strcmp(var, "core.autocrlf")) {
 789                 if (value && !strcasecmp(value, "input")) {
 790                         if (core_eol == EOL_CRLF)
 791                                 return error("core.autocrlf=input conflicts with core.eol=crlf");
 792                         auto_crlf = AUTO_CRLF_INPUT;
 793                         return 0;
 794                 }
 795                 auto_crlf = git_config_bool(var, value);
 796                 return 0;
 797         }
 798
 799         if (!strcmp(var, "core.safecrlf")) {
 800                 if (value && !strcasecmp(value, "warn")) {
 801                         safe_crlf = SAFE_CRLF_WARN;
 802                         return 0;
 803                 }
 804                 safe_crlf = git_config_bool(var, value);
 805                 return 0;
 806         }
 807
 808         if (!strcmp(var, "core.eol")) {
 809                 if (value && !strcasecmp(value, "lf"))
 810                         core_eol = EOL_LF;
 811                 else if (value && !strcasecmp(value, "crlf"))
 812                         core_eol = EOL_CRLF;
 813                 else if (value && !strcasecmp(value, "native"))
 814                         core_eol = EOL_NATIVE;
 815                 else
 816                         core_eol = EOL_UNSET;
 817                 if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 818                         return error("core.autocrlf=input conflicts with core.eol=crlf");
 819                 return 0;
 820         }
 821
 822         if (!strcmp(var, "core.notesref")) {
 823                 notes_ref_name = xstrdup(value);
 824                 return 0;
 825         }
 826
 827         if (!strcmp(var, "core.pager"))
 828                 return git_config_string(&pager_program, var, value);
 829
 830         if (!strcmp(var, "core.editor"))
 831                 return git_config_string(&editor_program, var, value);
 832
 833         if (!strcmp(var, "core.commentchar")) {
 834                 const char *comment;
 835                 int ret = git_config_string(&comment, var, value);
 836                 if (!ret)
 837                         comment_line_char = comment[0];
 838                 return ret;
 839         }
 840
 841         if (!strcmp(var, "core.askpass"))
 842                 return git_config_string(&askpass_program, var, value);
 843
 844         if (!strcmp(var, "core.excludesfile"))
 845                 return git_config_pathname(&excludes_file, var, value);
 846
 847         if (!strcmp(var, "core.whitespace")) {
 848                 if (!value)
 849                         return config_error_nonbool(var);
 850                 whitespace_rule_cfg = parse_whitespace_rule(value);
 851                 return 0;
 852         }
 853
 854         if (!strcmp(var, "core.fsyncobjectfiles")) {
 855                 fsync_object_files = git_config_bool(var, value);
 856                 return 0;
 857         }
 858
 859         if (!strcmp(var, "core.preloadindex")) {
 860                 core_preload_index = git_config_bool(var, value);
 861                 return 0;
 862         }
 863
 864         if (!strcmp(var, "core.createobject")) {
 865                 if (!strcmp(value, "rename"))
 866                         object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 867                 else if (!strcmp(value, "link"))
 868                         object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 869                 else
 870                         die("Invalid mode for object creation: %s", value);
 871                 return 0;
 872         }
 873
 874         if (!strcmp(var, "core.sparsecheckout")) {
 875                 core_apply_sparse_checkout = git_config_bool(var, value);
 876                 return 0;
 877         }
 878
 879         if (!strcmp(var, "core.precomposeunicode")) {
 880                 precomposed_unicode = git_config_bool(var, value);
 881                 return 0;
 882         }
 883
 884         /* Add other config variables here and to Documentation/config.txt. */
 885         return 0;
 886 }
 887
 888 static int git_default_i18n_config(const char *var, const char *value)
 889 {
 890         if (!strcmp(var, "i18n.commitencoding"))
 891                 return git_config_string(&git_commit_encoding, var, value);
 892
 893         if (!strcmp(var, "i18n.logoutputencoding"))
 894                 return git_config_string(&git_log_output_encoding, var, value);
 895
 896         /* Add other config variables here and to Documentation/config.txt. */
 897         return 0;
 898 }
 899
 900 static int git_default_branch_config(const char *var, const char *value)
 901 {
 902         if (!strcmp(var, "branch.autosetupmerge")) {
 903                 if (value && !strcasecmp(value, "always")) {
 904                         git_branch_track = BRANCH_TRACK_ALWAYS;
 905                         return 0;
 906                 }
 907                 git_branch_track = git_config_bool(var, value);
 908                 return 0;
 909         }
 910         if (!strcmp(var, "branch.autosetuprebase")) {
 911                 if (!value)
 912                         return config_error_nonbool(var);
 913                 else if (!strcmp(value, "never"))
 914                         autorebase = AUTOREBASE_NEVER;
 915                 else if (!strcmp(value, "local"))
 916                         autorebase = AUTOREBASE_LOCAL;
 917                 else if (!strcmp(value, "remote"))
 918                         autorebase = AUTOREBASE_REMOTE;
 919                 else if (!strcmp(value, "always"))
 920                         autorebase = AUTOREBASE_ALWAYS;
 921                 else
 922                         return error("Malformed value for %s", var);
 923                 return 0;
 924         }
 925
 926         /* Add other config variables here and to Documentation/config.txt. */
 927         return 0;
 928 }
 929
 930 static int git_default_push_config(const char *var, const char *value)
 931 {
 932         if (!strcmp(var, "push.default")) {
 933                 if (!value)
 934                         return config_error_nonbool(var);
 935                 else if (!strcmp(value, "nothing"))
 936                         push_default = PUSH_DEFAULT_NOTHING;
 937                 else if (!strcmp(value, "matching"))
 938                         push_default = PUSH_DEFAULT_MATCHING;
 939                 else if (!strcmp(value, "simple"))
 940                         push_default = PUSH_DEFAULT_SIMPLE;
 941                 else if (!strcmp(value, "upstream"))
 942                         push_default = PUSH_DEFAULT_UPSTREAM;
 943                 else if (!strcmp(value, "tracking")) /* deprecated */
 944                         push_default = PUSH_DEFAULT_UPSTREAM;
 945                 else if (!strcmp(value, "current"))
 946                         push_default = PUSH_DEFAULT_CURRENT;
 947                 else {
 948                         error("Malformed value for %s: %s", var, value);
 949                         return error("Must be one of nothing, matching, simple, "
 950                                      "upstream or current.");
 951                 }
 952                 return 0;
 953         }
 954
 955         /* Add other config variables here and to Documentation/config.txt. */
 956         return 0;
 957 }
 958
 959 static int git_default_mailmap_config(const char *var, const char *value)
 960 {
 961         if (!strcmp(var, "mailmap.file"))
 962                 return git_config_string(&git_mailmap_file, var, value);
 963         if (!strcmp(var, "mailmap.blob"))
 964                 return git_config_string(&git_mailmap_blob, var, value);
 965
 966         /* Add other config variables here and to Documentation/config.txt. */
 967         return 0;
 968 }
 969
 970 int git_default_config(const char *var, const char *value, void *dummy)
 971 {
 972         if (!prefixcmp(var, "core."))
 973                 return git_default_core_config(var, value);
 974
 975         if (!prefixcmp(var, "user."))
 976                 return git_ident_config(var, value, dummy);
 977
 978         if (!prefixcmp(var, "i18n."))
 979                 return git_default_i18n_config(var, value);
 980
 981         if (!prefixcmp(var, "branch."))
 982                 return git_default_branch_config(var, value);
 983
 984         if (!prefixcmp(var, "push."))
 985                 return git_default_push_config(var, value);
 986
 987         if (!prefixcmp(var, "mailmap."))
 988                 return git_default_mailmap_config(var, value);
 989
 990         if (!prefixcmp(var, "advice."))
 991                 return git_default_advice_config(var, value);
 992
 993         if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 994                 pager_use_color = git_config_bool(var,value);
 995                 return 0;
 996         }
 997
 998         if (!strcmp(var, "pack.packsizelimit")) {
 999                 pack_size_limit_cfg = git_config_ulong(var, value);
1000                 return 0;
1001         }
1002         /* Add other config variables here and to Documentation/config.txt. */
1003         return 0;
1004 }
1005
1006 /*
1007  * All source specific fields in the union, die_on_error, name and the callbacks
1008  * fgetc, ungetc, ftell of top need to be initialized before calling
1009  * this function.
1010  */
1011 static int do_config_from(struct config_source *top, config_fn_t fn, void *data)
1012 {
1013         int ret;
1014
1015         /* push config-file parsing state stack */
1016         top->prev = cf;
1017         top->linenr = 1;
1018         top->eof = 0;
1019         strbuf_init(&top->value, 1024);
1020         strbuf_init(&top->var, 1024);
1021         cf = top;
1022
1023         ret = git_parse_source(fn, data);
1024
1025         /* pop config-file parsing state stack */
1026         strbuf_release(&top->value);
1027         strbuf_release(&top->var);
1028         cf = top->prev;
1029
1030         return ret;
1031 }
1032
1033 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
1034 {
1035         int ret;
1036         FILE *f = fopen(filename, "r");
1037
1038         ret = -1;
1039         if (f) {
1040                 struct config_source top;
1041
1042                 top.u.file = f;
1043                 top.name = filename;
1044                 top.die_on_error = 1;
1045                 top.do_fgetc = config_file_fgetc;
1046                 top.do_ungetc = config_file_ungetc;
1047                 top.do_ftell = config_file_ftell;
1048
1049                 ret = do_config_from(&top, fn, data);
1050
1051                 fclose(f);
1052         }
1053         return ret;
1054 }
1055
1056 int git_config_from_buf(config_fn_t fn, const char *name, const char *buf,
1057                         size_t len, void *data)
1058 {
1059         struct config_source top;
1060
1061         top.u.buf.buf = buf;
1062         top.u.buf.len = len;
1063         top.u.buf.pos = 0;
1064         top.name = name;
1065         top.die_on_error = 0;
1066         top.do_fgetc = config_buf_fgetc;
1067         top.do_ungetc = config_buf_ungetc;
1068         top.do_ftell = config_buf_ftell;
1069
1070         return do_config_from(&top, fn, data);
1071 }
1072
1073 static int git_config_from_blob_sha1(config_fn_t fn,
1074                                      const char *name,
1075                                      const unsigned char *sha1,
1076                                      void *data)
1077 {
1078         enum object_type type;
1079         char *buf;
1080         unsigned long size;
1081         int ret;
1082
1083         buf = read_sha1_file(sha1, &type, &size);
1084         if (!buf)
1085                 return error("unable to load config blob object '%s'", name);
1086         if (type != OBJ_BLOB) {
1087                 free(buf);
1088                 return error("reference '%s' does not point to a blob", name);
1089         }
1090
1091         ret = git_config_from_buf(fn, name, buf, size, data);
1092         free(buf);
1093
1094         return ret;
1095 }
1096
1097 static int git_config_from_blob_ref(config_fn_t fn,
1098                                     const char *name,
1099                                     void *data)
1100 {
1101         unsigned char sha1[20];
1102
1103         if (get_sha1(name, sha1) < 0)
1104                 return error("unable to resolve config blob '%s'", name);
1105         return git_config_from_blob_sha1(fn, name, sha1, data);
1106 }
1107
1108 const char *git_etc_gitconfig(void)
1109 {
1110         static const char *system_wide;
1111         if (!system_wide)
1112                 system_wide = system_path(ETC_GITCONFIG);
1113         return system_wide;
1114 }
1115
1116 int git_env_bool(const char *k, int def)
1117 {
1118         const char *v = getenv(k);
1119         return v ? git_config_bool(k, v) : def;
1120 }
1121
1122 int git_config_system(void)
1123 {
1124         return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
1125 }
1126
1127 int git_config_early(config_fn_t fn, void *data, const char *repo_config)
1128 {
1129         int ret = 0, found = 0;
1130         char *xdg_config = NULL;
1131         char *user_config = NULL;
1132
1133         home_config_paths(&user_config, &xdg_config, "config");
1134
1135         if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0)) {
1136                 ret += git_config_from_file(fn, git_etc_gitconfig(),
1137                                             data);
1138                 found += 1;
1139         }
1140
1141         if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK)) {
1142                 ret += git_config_from_file(fn, xdg_config, data);
1143                 found += 1;
1144         }
1145
1146         if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK)) {
1147                 ret += git_config_from_file(fn, user_config, data);
1148                 found += 1;
1149         }
1150
1151         if (repo_config && !access_or_die(repo_config, R_OK, 0)) {
1152                 ret += git_config_from_file(fn, repo_config, data);
1153                 found += 1;
1154         }
1155
1156         switch (git_config_from_parameters(fn, data)) {
1157         case -1: /* error */
1158                 die("unable to parse command-line config");
1159                 break;
1160         case 0: /* found nothing */
1161                 break;
1162         default: /* found at least one item */
1163                 found++;
1164                 break;
1165         }
1166
1167         free(xdg_config);
1168         free(user_config);
1169         return ret == 0 ? found : ret;
1170 }
1171
1172 int git_config_with_options(config_fn_t fn, void *data,
1173                             const char *filename,
1174                             const char *blob_ref,
1175                             int respect_includes)
1176 {
1177         char *repo_config = NULL;
1178         int ret;
1179         struct config_include_data inc = CONFIG_INCLUDE_INIT;
1180
1181         if (respect_includes) {
1182                 inc.fn = fn;
1183                 inc.data = data;
1184                 fn = git_config_include;
1185                 data = &inc;
1186         }
1187
1188         /*
1189          * If we have a specific filename, use it. Otherwise, follow the
1190          * regular lookup sequence.
1191          */
1192         if (filename)
1193                 return git_config_from_file(fn, filename, data);
1194         else if (blob_ref)
1195                 return git_config_from_blob_ref(fn, blob_ref, data);
1196
1197         repo_config = git_pathdup("config");
1198         ret = git_config_early(fn, data, repo_config);
1199         if (repo_config)
1200                 free(repo_config);
1201         return ret;
1202 }
1203
1204 int git_config(config_fn_t fn, void *data)
1205 {
1206         return git_config_with_options(fn, data, NULL, NULL, 1);
1207 }
1208
1209 /*
1210  * Find all the stuff for git_config_set() below.
1211  */
1212
1213 #define MAX_MATCHES 512
1214
1215 static struct {
1216         int baselen;
1217         char *key;
1218         int do_not_match;
1219         regex_t *value_regex;
1220         int multi_replace;
1221         size_t offset[MAX_MATCHES];
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                         } else if (store.seen >= MAX_MATCHES) {
1245                                 error("too many matches for %s", key);
1246                                 return 1;
1247                         }
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                 store.offset[store.seen] = cf->do_ftell(cf);
1277                 /* fallthru */
1278         case SECTION_END_SEEN:
1279         case START:
1280                 if (matches(key, value)) {
1281                         store.offset[store.seen] = cf->do_ftell(cf);
1282                         store.state = KEY_SEEN;
1283                         store.seen++;
1284                 } else {
1285                         if (strrchr(key, '.') - key == store.baselen &&
1286                               !strncmp(key, store.key, store.baselen)) {
1287                                         store.state = SECTION_SEEN;
1288                                         store.offset[store.seen] = cf->do_ftell(cf);
1289                         }
1290                 }
1291         }
1292         return 0;
1293 }
1294
1295 static int write_error(const char *filename)
1296 {
1297         error("failed to write new configuration file %s", filename);
1298
1299         /* Same error code as "failed to rename". */
1300         return 4;
1301 }
1302
1303 static int store_write_section(int fd, const char *key)
1304 {
1305         const char *dot;
1306         int i, success;
1307         struct strbuf sb = STRBUF_INIT;
1308
1309         dot = memchr(key, '.', store.baselen);
1310         if (dot) {
1311                 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1312                 for (i = dot - key + 1; i < store.baselen; i++) {
1313                         if (key[i] == '"' || key[i] == '\\')
1314                                 strbuf_addch(&sb, '\\');
1315                         strbuf_addch(&sb, key[i]);
1316                 }
1317                 strbuf_addstr(&sb, "\"]\n");
1318         } else {
1319                 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1320         }
1321
1322         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1323         strbuf_release(&sb);
1324
1325         return success;
1326 }
1327
1328 static int store_write_pair(int fd, const char *key, const char *value)
1329 {
1330         int i, success;
1331         int length = strlen(key + store.baselen + 1);
1332         const char *quote = "";
1333         struct strbuf sb = STRBUF_INIT;
1334
1335         /*
1336          * Check to see if the value needs to be surrounded with a dq pair.
1337          * Note that problematic characters are always backslash-quoted; this
1338          * check is about not losing leading or trailing SP and strings that
1339          * follow beginning-of-comment characters (i.e. ';' and '#') by the
1340          * configuration parser.
1341          */
1342         if (value[0] == ' ')
1343                 quote = "\"";
1344         for (i = 0; value[i]; i++)
1345                 if (value[i] == ';' || value[i] == '#')
1346                         quote = "\"";
1347         if (i && value[i - 1] == ' ')
1348                 quote = "\"";
1349
1350         strbuf_addf(&sb, "\t%.*s = %s",
1351                     length, key + store.baselen + 1, quote);
1352
1353         for (i = 0; value[i]; i++)
1354                 switch (value[i]) {
1355                 case '\n':
1356                         strbuf_addstr(&sb, "\\n");
1357                         break;
1358                 case '\t':
1359                         strbuf_addstr(&sb, "\\t");
1360                         break;
1361                 case '"':
1362                 case '\\':
1363                         strbuf_addch(&sb, '\\');
1364                 default:
1365                         strbuf_addch(&sb, value[i]);
1366                         break;
1367                 }
1368         strbuf_addf(&sb, "%s\n", quote);
1369
1370         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1371         strbuf_release(&sb);
1372
1373         return success;
1374 }
1375
1376 static ssize_t find_beginning_of_line(const char *contents, size_t size,
1377         size_t offset_, int *found_bracket)
1378 {
1379         size_t equal_offset = size, bracket_offset = size;
1380         ssize_t offset;
1381
1382 contline:
1383         for (offset = offset_-2; offset > 0
1384                         && contents[offset] != '\n'; offset--)
1385                 switch (contents[offset]) {
1386                         case '=': equal_offset = offset; break;
1387                         case ']': bracket_offset = offset; break;
1388                 }
1389         if (offset > 0 && contents[offset-1] == '\\') {
1390                 offset_ = offset;
1391                 goto contline;
1392         }
1393         if (bracket_offset < equal_offset) {
1394                 *found_bracket = 1;
1395                 offset = bracket_offset+1;
1396         } else
1397                 offset++;
1398
1399         return offset;
1400 }
1401
1402 int git_config_set_in_file(const char *config_filename,
1403                         const char *key, const char *value)
1404 {
1405         return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1406 }
1407
1408 int git_config_set(const char *key, const char *value)
1409 {
1410         return git_config_set_multivar(key, value, NULL, 0);
1411 }
1412
1413 /*
1414  * Auxiliary function to sanity-check and split the key into the section
1415  * identifier and variable name.
1416  *
1417  * Returns 0 on success, -1 when there is an invalid character in the key and
1418  * -2 if there is no section name in the key.
1419  *
1420  * store_key - pointer to char* which will hold a copy of the key with
1421  *             lowercase section and variable name
1422  * baselen - pointer to int which will hold the length of the
1423  *           section + subsection part, can be NULL
1424  */
1425 int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1426 {
1427         int i, dot, baselen;
1428         const char *last_dot = strrchr(key, '.');
1429
1430         /*
1431          * Since "key" actually contains the section name and the real
1432          * key name separated by a dot, we have to know where the dot is.
1433          */
1434
1435         if (last_dot == NULL || last_dot == key) {
1436                 error("key does not contain a section: %s", key);
1437                 return -CONFIG_NO_SECTION_OR_NAME;
1438         }
1439
1440         if (!last_dot[1]) {
1441                 error("key does not contain variable name: %s", key);
1442                 return -CONFIG_NO_SECTION_OR_NAME;
1443         }
1444
1445         baselen = last_dot - key;
1446         if (baselen_)
1447                 *baselen_ = baselen;
1448
1449         /*
1450          * Validate the key and while at it, lower case it for matching.
1451          */
1452         *store_key = xmalloc(strlen(key) + 1);
1453
1454         dot = 0;
1455         for (i = 0; key[i]; i++) {
1456                 unsigned char c = key[i];
1457                 if (c == '.')
1458                         dot = 1;
1459                 /* Leave the extended basename untouched.. */
1460                 if (!dot || i > baselen) {
1461                         if (!iskeychar(c) ||
1462                             (i == baselen + 1 && !isalpha(c))) {
1463                                 error("invalid key: %s", key);
1464                                 goto out_free_ret_1;
1465                         }
1466                         c = tolower(c);
1467                 } else if (c == '\n') {
1468                         error("invalid key (newline): %s", key);
1469                         goto out_free_ret_1;
1470                 }
1471                 (*store_key)[i] = c;
1472         }
1473         (*store_key)[i] = 0;
1474
1475         return 0;
1476
1477 out_free_ret_1:
1478         free(*store_key);
1479         *store_key = NULL;
1480         return -CONFIG_INVALID_KEY;
1481 }
1482
1483 /*
1484  * If value==NULL, unset in (remove from) config,
1485  * if value_regex!=NULL, disregard key/value pairs where value does not match.
1486  * if multi_replace==0, nothing, or only one matching key/value is replaced,
1487  *     else all matching key/values (regardless how many) are removed,
1488  *     before the new pair is written.
1489  *
1490  * Returns 0 on success.
1491  *
1492  * This function does this:
1493  *
1494  * - it locks the config file by creating ".git/config.lock"
1495  *
1496  * - it then parses the config using store_aux() as validator to find
1497  *   the position on the key/value pair to replace. If it is to be unset,
1498  *   it must be found exactly once.
1499  *
1500  * - the config file is mmap()ed and the part before the match (if any) is
1501  *   written to the lock file, then the changed part and the rest.
1502  *
1503  * - the config file is removed and the lock file rename()d to it.
1504  *
1505  */
1506 int git_config_set_multivar_in_file(const char *config_filename,
1507                                 const char *key, const char *value,
1508                                 const char *value_regex, int multi_replace)
1509 {
1510         int fd = -1, in_fd;
1511         int ret;
1512         struct lock_file *lock = NULL;
1513         char *filename_buf = NULL;
1514
1515         /* parse-key returns negative; flip the sign to feed exit(3) */
1516         ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1517         if (ret)
1518                 goto out_free;
1519
1520         store.multi_replace = multi_replace;
1521
1522         if (!config_filename)
1523                 config_filename = filename_buf = git_pathdup("config");
1524
1525         /*
1526          * The lock serves a purpose in addition to locking: the new
1527          * contents of .git/config will be written into it.
1528          */
1529         lock = xcalloc(sizeof(struct lock_file), 1);
1530         fd = hold_lock_file_for_update(lock, config_filename, 0);
1531         if (fd < 0) {
1532                 error("could not lock config file %s: %s", config_filename, strerror(errno));
1533                 free(store.key);
1534                 ret = CONFIG_NO_LOCK;
1535                 goto out_free;
1536         }
1537
1538         /*
1539          * If .git/config does not exist yet, write a minimal version.
1540          */
1541         in_fd = open(config_filename, O_RDONLY);
1542         if ( in_fd < 0 ) {
1543                 free(store.key);
1544
1545                 if ( ENOENT != errno ) {
1546                         error("opening %s: %s", config_filename,
1547                               strerror(errno));
1548                         ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1549                         goto out_free;
1550                 }
1551                 /* if nothing to unset, error out */
1552                 if (value == NULL) {
1553                         ret = CONFIG_NOTHING_SET;
1554                         goto out_free;
1555                 }
1556
1557                 store.key = (char *)key;
1558                 if (!store_write_section(fd, key) ||
1559                     !store_write_pair(fd, key, value))
1560                         goto write_err_out;
1561         } else {
1562                 struct stat st;
1563                 char *contents;
1564                 size_t contents_sz, copy_begin, copy_end;
1565                 int i, new_line = 0;
1566
1567                 if (value_regex == NULL)
1568                         store.value_regex = NULL;
1569                 else {
1570                         if (value_regex[0] == '!') {
1571                                 store.do_not_match = 1;
1572                                 value_regex++;
1573                         } else
1574                                 store.do_not_match = 0;
1575
1576                         store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1577                         if (regcomp(store.value_regex, value_regex,
1578                                         REG_EXTENDED)) {
1579                                 error("invalid pattern: %s", value_regex);
1580                                 free(store.value_regex);
1581                                 ret = CONFIG_INVALID_PATTERN;
1582                                 goto out_free;
1583                         }
1584                 }
1585
1586                 store.offset[0] = 0;
1587                 store.state = START;
1588                 store.seen = 0;
1589
1590                 /*
1591                  * After this, store.offset will contain the *end* offset
1592                  * of the last match, or remain at 0 if no match was found.
1593                  * As a side effect, we make sure to transform only a valid
1594                  * existing config file.
1595                  */
1596                 if (git_config_from_file(store_aux, config_filename, NULL)) {
1597                         error("invalid config file %s", config_filename);
1598                         free(store.key);
1599                         if (store.value_regex != NULL) {
1600                                 regfree(store.value_regex);
1601                                 free(store.value_regex);
1602                         }
1603                         ret = CONFIG_INVALID_FILE;
1604                         goto out_free;
1605                 }
1606
1607                 free(store.key);
1608                 if (store.value_regex != NULL) {
1609                         regfree(store.value_regex);
1610                         free(store.value_regex);
1611                 }
1612
1613                 /* if nothing to unset, or too many matches, error out */
1614                 if ((store.seen == 0 && value == NULL) ||
1615                                 (store.seen > 1 && multi_replace == 0)) {
1616                         ret = CONFIG_NOTHING_SET;
1617                         goto out_free;
1618                 }
1619
1620                 fstat(in_fd, &st);
1621                 contents_sz = xsize_t(st.st_size);
1622                 contents = xmmap(NULL, contents_sz, PROT_READ,
1623                         MAP_PRIVATE, in_fd, 0);
1624                 close(in_fd);
1625
1626                 if (store.seen == 0)
1627                         store.seen = 1;
1628
1629                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1630                         if (store.offset[i] == 0) {
1631                                 store.offset[i] = copy_end = contents_sz;
1632                         } else if (store.state != KEY_SEEN) {
1633                                 copy_end = store.offset[i];
1634                         } else
1635                                 copy_end = find_beginning_of_line(
1636                                         contents, contents_sz,
1637                                         store.offset[i]-2, &new_line);
1638
1639                         if (copy_end > 0 && contents[copy_end-1] != '\n')
1640                                 new_line = 1;
1641
1642                         /* write the first part of the config */
1643                         if (copy_end > copy_begin) {
1644                                 if (write_in_full(fd, contents + copy_begin,
1645                                                   copy_end - copy_begin) <
1646                                     copy_end - copy_begin)
1647                                         goto write_err_out;
1648                                 if (new_line &&
1649                                     write_str_in_full(fd, "\n") != 1)
1650                                         goto write_err_out;
1651                         }
1652                         copy_begin = store.offset[i];
1653                 }
1654
1655                 /* write the pair (value == NULL means unset) */
1656                 if (value != NULL) {
1657                         if (store.state == START) {
1658                                 if (!store_write_section(fd, key))
1659                                         goto write_err_out;
1660                         }
1661                         if (!store_write_pair(fd, key, value))
1662                                 goto write_err_out;
1663                 }
1664
1665                 /* write the rest of the config */
1666                 if (copy_begin < contents_sz)
1667                         if (write_in_full(fd, contents + copy_begin,
1668                                           contents_sz - copy_begin) <
1669                             contents_sz - copy_begin)
1670                                 goto write_err_out;
1671
1672                 munmap(contents, contents_sz);
1673         }
1674
1675         if (commit_lock_file(lock) < 0) {
1676                 error("could not commit config file %s", config_filename);
1677                 ret = CONFIG_NO_WRITE;
1678                 goto out_free;
1679         }
1680
1681         /*
1682          * lock is committed, so don't try to roll it back below.
1683          * NOTE: Since lockfile.c keeps a linked list of all created
1684          * lock_file structures, it isn't safe to free(lock).  It's
1685          * better to just leave it hanging around.
1686          */
1687         lock = NULL;
1688         ret = 0;
1689
1690 out_free:
1691         if (lock)
1692                 rollback_lock_file(lock);
1693         free(filename_buf);
1694         return ret;
1695
1696 write_err_out:
1697         ret = write_error(lock->filename);
1698         goto out_free;
1699
1700 }
1701
1702 int git_config_set_multivar(const char *key, const char *value,
1703                         const char *value_regex, int multi_replace)
1704 {
1705         return git_config_set_multivar_in_file(NULL, key, value, value_regex,
1706                                                multi_replace);
1707 }
1708
1709 static int section_name_match (const char *buf, const char *name)
1710 {
1711         int i = 0, j = 0, dot = 0;
1712         if (buf[i] != '[')
1713                 return 0;
1714         for (i = 1; buf[i] && buf[i] != ']'; i++) {
1715                 if (!dot && isspace(buf[i])) {
1716                         dot = 1;
1717                         if (name[j++] != '.')
1718                                 break;
1719                         for (i++; isspace(buf[i]); i++)
1720                                 ; /* do nothing */
1721                         if (buf[i] != '"')
1722                                 break;
1723                         continue;
1724                 }
1725                 if (buf[i] == '\\' && dot)
1726                         i++;
1727                 else if (buf[i] == '"' && dot) {
1728                         for (i++; isspace(buf[i]); i++)
1729                                 ; /* do_nothing */
1730                         break;
1731                 }
1732                 if (buf[i] != name[j++])
1733                         break;
1734         }
1735         if (buf[i] == ']' && name[j] == 0) {
1736                 /*
1737                  * We match, now just find the right length offset by
1738                  * gobbling up any whitespace after it, as well
1739                  */
1740                 i++;
1741                 for (; buf[i] && isspace(buf[i]); i++)
1742                         ; /* do nothing */
1743                 return i;
1744         }
1745         return 0;
1746 }
1747
1748 static int section_name_is_ok(const char *name)
1749 {
1750         /* Empty section names are bogus. */
1751         if (!*name)
1752                 return 0;
1753
1754         /*
1755          * Before a dot, we must be alphanumeric or dash. After the first dot,
1756          * anything goes, so we can stop checking.
1757          */
1758         for (; *name && *name != '.'; name++)
1759                 if (*name != '-' && !isalnum(*name))
1760                         return 0;
1761         return 1;
1762 }
1763
1764 /* if new_name == NULL, the section is removed instead */
1765 int git_config_rename_section_in_file(const char *config_filename,
1766                                       const char *old_name, const char *new_name)
1767 {
1768         int ret = 0, remove = 0;
1769         char *filename_buf = NULL;
1770         struct lock_file *lock;
1771         int out_fd;
1772         char buf[1024];
1773         FILE *config_file;
1774
1775         if (new_name && !section_name_is_ok(new_name)) {
1776                 ret = error("invalid section name: %s", new_name);
1777                 goto out;
1778         }
1779
1780         if (!config_filename)
1781                 config_filename = filename_buf = git_pathdup("config");
1782
1783         lock = xcalloc(sizeof(struct lock_file), 1);
1784         out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1785         if (out_fd < 0) {
1786                 ret = error("could not lock config file %s", config_filename);
1787                 goto out;
1788         }
1789
1790         if (!(config_file = fopen(config_filename, "rb"))) {
1791                 /* no config file means nothing to rename, no error */
1792                 goto unlock_and_out;
1793         }
1794
1795         while (fgets(buf, sizeof(buf), config_file)) {
1796                 int i;
1797                 int length;
1798                 char *output = buf;
1799                 for (i = 0; buf[i] && isspace(buf[i]); i++)
1800                         ; /* do nothing */
1801                 if (buf[i] == '[') {
1802                         /* it's a section */
1803                         int offset = section_name_match(&buf[i], old_name);
1804                         if (offset > 0) {
1805                                 ret++;
1806                                 if (new_name == NULL) {
1807                                         remove = 1;
1808                                         continue;
1809                                 }
1810                                 store.baselen = strlen(new_name);
1811                                 if (!store_write_section(out_fd, new_name)) {
1812                                         ret = write_error(lock->filename);
1813                                         goto out;
1814                                 }
1815                                 /*
1816                                  * We wrote out the new section, with
1817                                  * a newline, now skip the old
1818                                  * section's length
1819                                  */
1820                                 output += offset + i;
1821                                 if (strlen(output) > 0) {
1822                                         /*
1823                                          * More content means there's
1824                                          * a declaration to put on the
1825                                          * next line; indent with a
1826                                          * tab
1827                                          */
1828                                         output -= 1;
1829                                         output[0] = '\t';
1830                                 }
1831                         }
1832                         remove = 0;
1833                 }
1834                 if (remove)
1835                         continue;
1836                 length = strlen(output);
1837                 if (write_in_full(out_fd, output, length) != length) {
1838                         ret = write_error(lock->filename);
1839                         goto out;
1840                 }
1841         }
1842         fclose(config_file);
1843 unlock_and_out:
1844         if (commit_lock_file(lock) < 0)
1845                 ret = error("could not commit config file %s", config_filename);
1846 out:
1847         free(filename_buf);
1848         return ret;
1849 }
1850
1851 int git_config_rename_section(const char *old_name, const char *new_name)
1852 {
1853         return git_config_rename_section_in_file(NULL, old_name, new_name);
1854 }
1855
1856 /*
1857  * Call this to report error for your variable that should not
1858  * get a boolean value (i.e. "[my] var" means "true").
1859  */
1860 #undef config_error_nonbool
1861 int config_error_nonbool(const char *var)
1862 {
1863         return error("Missing value for '%s'", var);
1864 }
1865
1866 int parse_config_key(const char *var,
1867                      const char *section,
1868                      const char **subsection, int *subsection_len,
1869                      const char **key)
1870 {
1871         int section_len = strlen(section);
1872         const char *dot;
1873
1874         /* Does it start with "section." ? */
1875         if (prefixcmp(var, section) || var[section_len] != '.')
1876                 return -1;
1877
1878         /*
1879          * Find the key; we don't know yet if we have a subsection, but we must
1880          * parse backwards from the end, since the subsection may have dots in
1881          * it, too.
1882          */
1883         dot = strrchr(var, '.');
1884         *key = dot + 1;
1885
1886         /* Did we have a subsection at all? */
1887         if (dot == var + section_len) {
1888                 *subsection = NULL;
1889                 *subsection_len = 0;
1890         }
1891         else {
1892                 *subsection = var + section_len + 1;
1893                 *subsection_len = dot - *subsection;
1894         }
1895
1896         return 0;
1897 }