config.c

   1 /*
   2  * GIT - The information manager from hell
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  * Copyright (C) Johannes Schindelin, 2005
   6  *
   7  */
   8 #include "cache.h"
   9 #include "exec_cmd.h"
  10 #include "strbuf.h"
  11 #include "quote.h"
  12
  13 struct config_source {
  14         struct config_source *prev;
  15         union {
  16                 FILE *file;
  17                 struct config_buf {
  18                         const char *buf;
  19                         size_t len;
  20                         size_t pos;
  21                 } buf;
  22         } u;
  23         const char *name;
  24         const char *path;
  25         int die_on_error;
  26         int linenr;
  27         int eof;
  28         struct strbuf value;
  29         struct strbuf var;
  30
  31         int (*do_fgetc)(struct config_source *c);
  32         int (*do_ungetc)(int c, struct config_source *conf);
  33         long (*do_ftell)(struct config_source *c);
  34 };
  35
  36 static struct config_source *cf;
  37
  38 static int zlib_compression_seen;
  39
  40 static int config_file_fgetc(struct config_source *conf)
  41 {
  42         return fgetc(conf->u.file);
  43 }
  44
  45 static int config_file_ungetc(int c, struct config_source *conf)
  46 {
  47         return ungetc(c, conf->u.file);
  48 }
  49
  50 static long config_file_ftell(struct config_source *conf)
  51 {
  52         return ftell(conf->u.file);
  53 }
  54
  55
  56 static int config_buf_fgetc(struct config_source *conf)
  57 {
  58         if (conf->u.buf.pos < conf->u.buf.len)
  59                 return conf->u.buf.buf[conf->u.buf.pos++];
  60
  61         return EOF;
  62 }
  63
  64 static int config_buf_ungetc(int c, struct config_source *conf)
  65 {
  66         if (conf->u.buf.pos > 0)
  67                 return conf->u.buf.buf[--conf->u.buf.pos];
  68
  69         return EOF;
  70 }
  71
  72 static long config_buf_ftell(struct config_source *conf)
  73 {
  74         return conf->u.buf.pos;
  75 }
  76
  77 #define MAX_INCLUDE_DEPTH 10
  78 static const char include_depth_advice[] =
  79 "exceeded maximum include depth (%d) while including\n"
  80 "       %s\n"
  81 "from\n"
  82 "       %s\n"
  83 "Do you have circular includes?";
  84 static int handle_path_include(const char *path, struct config_include_data *inc)
  85 {
  86         int ret = 0;
  87         struct strbuf buf = STRBUF_INIT;
  88         char *expanded;
  89
  90         if (!path)
  91                 return config_error_nonbool("include.path");
  92
  93         expanded = expand_user_path(path);
  94         if (!expanded)
  95                 return error("Could not expand include path '%s'", path);
  96         path = expanded;
  97
  98         /*
  99          * Use an absolute path as-is, but interpret relative paths
 100          * based on the including config file.
 101          */
 102         if (!is_absolute_path(path)) {
 103                 char *slash;
 104
 105                 if (!cf || !cf->path)
 106                         return error("relative config includes must come from files");
 107
 108                 slash = find_last_dir_sep(cf->path);
 109                 if (slash)
 110                         strbuf_add(&buf, cf->path, slash - cf->path + 1);
 111                 strbuf_addstr(&buf, path);
 112                 path = buf.buf;
 113         }
 114
 115         if (!access_or_die(path, R_OK, 0)) {
 116                 if (++inc->depth > MAX_INCLUDE_DEPTH)
 117                         die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
 118                             cf && cf->name ? cf->name : "the command line");
 119                 ret = git_config_from_file(git_config_include, path, inc);
 120                 inc->depth--;
 121         }
 122         strbuf_release(&buf);
 123         free(expanded);
 124         return ret;
 125 }
 126
 127 int git_config_include(const char *var, const char *value, void *data)
 128 {
 129         struct config_include_data *inc = data;
 130         const char *type;
 131         int ret;
 132
 133         /*
 134          * Pass along all values, including "include" directives; this makes it
 135          * possible to query information on the includes themselves.
 136          */
 137         ret = inc->fn(var, value, inc->data);
 138         if (ret < 0)
 139                 return ret;
 140
 141         type = skip_prefix(var, "include.");
 142         if (!type)
 143                 return ret;
 144
 145         if (!strcmp(type, "path"))
 146                 ret = handle_path_include(value, inc);
 147         return ret;
 148 }
 149
 150 void git_config_push_parameter(const char *text)
 151 {
 152         struct strbuf env = STRBUF_INIT;
 153         const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
 154         if (old) {
 155                 strbuf_addstr(&env, old);
 156                 strbuf_addch(&env, ' ');
 157         }
 158         sq_quote_buf(&env, text);
 159         setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
 160         strbuf_release(&env);
 161 }
 162
 163 int git_config_parse_parameter(const char *text,
 164                                config_fn_t fn, void *data)
 165 {
 166         struct strbuf **pair;
 167         pair = strbuf_split_str(text, '=', 2);
 168         if (!pair[0])
 169                 return error("bogus config parameter: %s", text);
 170         if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
 171                 strbuf_setlen(pair[0], pair[0]->len - 1);
 172         strbuf_trim(pair[0]);
 173         if (!pair[0]->len) {
 174                 strbuf_list_free(pair);
 175                 return error("bogus config parameter: %s", text);
 176         }
 177         strbuf_tolower(pair[0]);
 178         if (fn(pair[0]->buf, pair[1] ? pair[1]->buf : NULL, data) < 0) {
 179                 strbuf_list_free(pair);
 180                 return -1;
 181         }
 182         strbuf_list_free(pair);
 183         return 0;
 184 }
 185
 186 int git_config_from_parameters(config_fn_t fn, void *data)
 187 {
 188         const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 189         char *envw;
 190         const char **argv = NULL;
 191         int nr = 0, alloc = 0;
 192         int i;
 193
 194         if (!env)
 195                 return 0;
 196         /* sq_dequote will write over it */
 197         envw = xstrdup(env);
 198
 199         if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 200                 free(envw);
 201                 return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
 202         }
 203
 204         for (i = 0; i < nr; i++) {
 205                 if (git_config_parse_parameter(argv[i], fn, data) < 0) {
 206                         free(argv);
 207                         free(envw);
 208                         return -1;
 209                 }
 210         }
 211
 212         free(argv);
 213         free(envw);
 214         return nr > 0;
 215 }
 216
 217 static int get_next_char(void)
 218 {
 219         int c = cf->do_fgetc(cf);
 220
 221         if (c == '\r') {
 222                 /* DOS like systems */
 223                 c = cf->do_fgetc(cf);
 224                 if (c != '\n') {
 225                         cf->do_ungetc(c, cf);
 226                         c = '\r';
 227                 }
 228         }
 229         if (c == '\n')
 230                 cf->linenr++;
 231         if (c == EOF) {
 232                 cf->eof = 1;
 233                 c = '\n';
 234         }
 235         return c;
 236 }
 237
 238 static char *parse_value(void)
 239 {
 240         int quote = 0, comment = 0, space = 0;
 241
 242         strbuf_reset(&cf->value);
 243         for (;;) {
 244                 int c = get_next_char();
 245                 if (c == '\n') {
 246                         if (quote) {
 247                                 cf->linenr--;
 248                                 return NULL;
 249                         }
 250                         return cf->value.buf;
 251                 }
 252                 if (comment)
 253                         continue;
 254                 if (isspace(c) && !quote) {
 255                         if (cf->value.len)
 256                                 space++;
 257                         continue;
 258                 }
 259                 if (!quote) {
 260                         if (c == ';' || c == '#') {
 261                                 comment = 1;
 262                                 continue;
 263                         }
 264                 }
 265                 for (; space; space--)
 266                         strbuf_addch(&cf->value, ' ');
 267                 if (c == '\\') {
 268                         c = get_next_char();
 269                         switch (c) {
 270                         case '\n':
 271                                 continue;
 272                         case 't':
 273                                 c = '\t';
 274                                 break;
 275                         case 'b':
 276                                 c = '\b';
 277                                 break;
 278                         case 'n':
 279                                 c = '\n';
 280                                 break;
 281                         /* Some characters escape as themselves */
 282                         case '\\': case '"':
 283                                 break;
 284                         /* Reject unknown escape sequences */
 285                         default:
 286                                 return NULL;
 287                         }
 288                         strbuf_addch(&cf->value, c);
 289                         continue;
 290                 }
 291                 if (c == '"') {
 292                         quote = 1-quote;
 293                         continue;
 294                 }
 295                 strbuf_addch(&cf->value, c);
 296         }
 297 }
 298
 299 static inline int iskeychar(int c)
 300 {
 301         return isalnum(c) || c == '-';
 302 }
 303
 304 static int get_value(config_fn_t fn, void *data, struct strbuf *name)
 305 {
 306         int c;
 307         char *value;
 308
 309         /* Get the full name */
 310         for (;;) {
 311                 c = get_next_char();
 312                 if (cf->eof)
 313                         break;
 314                 if (!iskeychar(c))
 315                         break;
 316                 strbuf_addch(name, tolower(c));
 317         }
 318
 319         while (c == ' ' || c == '\t')
 320                 c = get_next_char();
 321
 322         value = NULL;
 323         if (c != '\n') {
 324                 if (c != '=')
 325                         return -1;
 326                 value = parse_value();
 327                 if (!value)
 328                         return -1;
 329         }
 330         return fn(name->buf, value, data);
 331 }
 332
 333 static int get_extended_base_var(struct strbuf *name, int c)
 334 {
 335         do {
 336                 if (c == '\n')
 337                         goto error_incomplete_line;
 338                 c = get_next_char();
 339         } while (isspace(c));
 340
 341         /* We require the format to be '[base "extension"]' */
 342         if (c != '"')
 343                 return -1;
 344         strbuf_addch(name, '.');
 345
 346         for (;;) {
 347                 int c = get_next_char();
 348                 if (c == '\n')
 349                         goto error_incomplete_line;
 350                 if (c == '"')
 351                         break;
 352                 if (c == '\\') {
 353                         c = get_next_char();
 354                         if (c == '\n')
 355                                 goto error_incomplete_line;
 356                 }
 357                 strbuf_addch(name, c);
 358         }
 359
 360         /* Final ']' */
 361         if (get_next_char() != ']')
 362                 return -1;
 363         return 0;
 364 error_incomplete_line:
 365         cf->linenr--;
 366         return -1;
 367 }
 368
 369 static int get_base_var(struct strbuf *name)
 370 {
 371         for (;;) {
 372                 int c = get_next_char();
 373                 if (cf->eof)
 374                         return -1;
 375                 if (c == ']')
 376                         return 0;
 377                 if (isspace(c))
 378                         return get_extended_base_var(name, c);
 379                 if (!iskeychar(c) && c != '.')
 380                         return -1;
 381                 strbuf_addch(name, tolower(c));
 382         }
 383 }
 384
 385 static int git_parse_source(config_fn_t fn, void *data)
 386 {
 387         int comment = 0;
 388         int baselen = 0;
 389         struct strbuf *var = &cf->var;
 390
 391         /* U+FEFF Byte Order Mark in UTF8 */
 392         static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 393         const unsigned char *bomptr = utf8_bom;
 394
 395         for (;;) {
 396                 int c = get_next_char();
 397                 if (bomptr && *bomptr) {
 398                         /* We are at the file beginning; skip UTF8-encoded BOM
 399                          * if present. Sane editors won't put this in on their
 400                          * own, but e.g. Windows Notepad will do it happily. */
 401                         if ((unsigned char) c == *bomptr) {
 402                                 bomptr++;
 403                                 continue;
 404                         } else {
 405                                 /* Do not tolerate partial BOM. */
 406                                 if (bomptr != utf8_bom)
 407                                         break;
 408                                 /* No BOM at file beginning. Cool. */
 409                                 bomptr = NULL;
 410                         }
 411                 }
 412                 if (c == '\n') {
 413                         if (cf->eof)
 414                                 return 0;
 415                         comment = 0;
 416                         continue;
 417                 }
 418                 if (comment || isspace(c))
 419                         continue;
 420                 if (c == '#' || c == ';') {
 421                         comment = 1;
 422                         continue;
 423                 }
 424                 if (c == '[') {
 425                         /* Reset prior to determining a new stem */
 426                         strbuf_reset(var);
 427                         if (get_base_var(var) < 0 || var->len < 1)
 428                                 break;
 429                         strbuf_addch(var, '.');
 430                         baselen = var->len;
 431                         continue;
 432                 }
 433                 if (!isalpha(c))
 434                         break;
 435                 /*
 436                  * Truncate the var name back to the section header
 437                  * stem prior to grabbing the suffix part of the name
 438                  * and the value.
 439                  */
 440                 strbuf_setlen(var, baselen);
 441                 strbuf_addch(var, tolower(c));
 442                 if (get_value(fn, data, var) < 0)
 443                         break;
 444         }
 445         if (cf->die_on_error)
 446                 die("bad config file line %d in %s", cf->linenr, cf->name);
 447         else
 448                 return error("bad config file line %d in %s", cf->linenr, cf->name);
 449 }
 450
 451 static int parse_unit_factor(const char *end, uintmax_t *val)
 452 {
 453         if (!*end)
 454                 return 1;
 455         else if (!strcasecmp(end, "k")) {
 456                 *val *= 1024;
 457                 return 1;
 458         }
 459         else if (!strcasecmp(end, "m")) {
 460                 *val *= 1024 * 1024;
 461                 return 1;
 462         }
 463         else if (!strcasecmp(end, "g")) {
 464                 *val *= 1024 * 1024 * 1024;
 465                 return 1;
 466         }
 467         return 0;
 468 }
 469
 470 static int git_parse_signed(const char *value, intmax_t *ret, intmax_t max)
 471 {
 472         if (value && *value) {
 473                 char *end;
 474                 intmax_t val;
 475                 uintmax_t uval;
 476                 uintmax_t factor = 1;
 477
 478                 errno = 0;
 479                 val = strtoimax(value, &end, 0);
 480                 if (errno == ERANGE)
 481                         return 0;
 482                 if (!parse_unit_factor(end, &factor)) {
 483                         errno = EINVAL;
 484                         return 0;
 485                 }
 486                 uval = abs(val);
 487                 uval *= factor;
 488                 if (uval > max || abs(val) > uval) {
 489                         errno = ERANGE;
 490                         return 0;
 491                 }
 492                 val *= factor;
 493                 *ret = val;
 494                 return 1;
 495         }
 496         errno = EINVAL;
 497         return 0;
 498 }
 499
 500 static int git_parse_unsigned(const char *value, uintmax_t *ret, uintmax_t max)
 501 {
 502         if (value && *value) {
 503                 char *end;
 504                 uintmax_t val;
 505                 uintmax_t oldval;
 506
 507                 errno = 0;
 508                 val = strtoumax(value, &end, 0);
 509                 if (errno == ERANGE)
 510                         return 0;
 511                 oldval = val;
 512                 if (!parse_unit_factor(end, &val)) {
 513                         errno = EINVAL;
 514                         return 0;
 515                 }
 516                 if (val > max || oldval > val) {
 517                         errno = ERANGE;
 518                         return 0;
 519                 }
 520                 *ret = val;
 521                 return 1;
 522         }
 523         errno = EINVAL;
 524         return 0;
 525 }
 526
 527 static int git_parse_int(const char *value, int *ret)
 528 {
 529         intmax_t tmp;
 530         if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int)))
 531                 return 0;
 532         *ret = tmp;
 533         return 1;
 534 }
 535
 536 static int git_parse_int64(const char *value, int64_t *ret)
 537 {
 538         intmax_t tmp;
 539         if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int64_t)))
 540                 return 0;
 541         *ret = tmp;
 542         return 1;
 543 }
 544
 545 int git_parse_ulong(const char *value, unsigned long *ret)
 546 {
 547         uintmax_t tmp;
 548         if (!git_parse_unsigned(value, &tmp, maximum_unsigned_value_of_type(long)))
 549                 return 0;
 550         *ret = tmp;
 551         return 1;
 552 }
 553
 554 NORETURN
 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.checkstat")) {
 667                 if (!strcasecmp(value, "default"))
 668                         check_stat = 1;
 669                 else if (!strcasecmp(value, "minimal"))
 670                         check_stat = 0;
 671         }
 672
 673         if (!strcmp(var, "core.quotepath")) {
 674                 quote_path_fully = git_config_bool(var, value);
 675                 return 0;
 676         }
 677
 678         if (!strcmp(var, "core.symlinks")) {
 679                 has_symlinks = git_config_bool(var, value);
 680                 return 0;
 681         }
 682
 683         if (!strcmp(var, "core.ignorecase")) {
 684                 ignore_case = git_config_bool(var, value);
 685                 return 0;
 686         }
 687
 688         if (!strcmp(var, "core.attributesfile"))
 689                 return git_config_pathname(&git_attributes_file, var, value);
 690
 691         if (!strcmp(var, "core.bare")) {
 692                 is_bare_repository_cfg = git_config_bool(var, value);
 693                 return 0;
 694         }
 695
 696         if (!strcmp(var, "core.ignorestat")) {
 697                 assume_unchanged = git_config_bool(var, value);
 698                 return 0;
 699         }
 700
 701         if (!strcmp(var, "core.prefersymlinkrefs")) {
 702                 prefer_symlink_refs = git_config_bool(var, value);
 703                 return 0;
 704         }
 705
 706         if (!strcmp(var, "core.logallrefupdates")) {
 707                 log_all_ref_updates = git_config_bool(var, value);
 708                 return 0;
 709         }
 710
 711         if (!strcmp(var, "core.warnambiguousrefs")) {
 712                 warn_ambiguous_refs = git_config_bool(var, value);
 713                 return 0;
 714         }
 715
 716         if (!strcmp(var, "core.abbrev")) {
 717                 int abbrev = git_config_int(var, value);
 718                 if (abbrev < minimum_abbrev || abbrev > 40)
 719                         return -1;
 720                 default_abbrev = abbrev;
 721                 return 0;
 722         }
 723
 724         if (!strcmp(var, "core.loosecompression")) {
 725                 int level = git_config_int(var, value);
 726                 if (level == -1)
 727                         level = Z_DEFAULT_COMPRESSION;
 728                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 729                         die("bad zlib compression level %d", level);
 730                 zlib_compression_level = level;
 731                 zlib_compression_seen = 1;
 732                 return 0;
 733         }
 734
 735         if (!strcmp(var, "core.compression")) {
 736                 int level = git_config_int(var, value);
 737                 if (level == -1)
 738                         level = Z_DEFAULT_COMPRESSION;
 739                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 740                         die("bad zlib compression level %d", level);
 741                 core_compression_level = level;
 742                 core_compression_seen = 1;
 743                 if (!zlib_compression_seen)
 744                         zlib_compression_level = level;
 745                 return 0;
 746         }
 747
 748         if (!strcmp(var, "core.packedgitwindowsize")) {
 749                 int pgsz_x2 = getpagesize() * 2;
 750                 packed_git_window_size = git_config_ulong(var, value);
 751
 752                 /* This value must be multiple of (pagesize * 2) */
 753                 packed_git_window_size /= pgsz_x2;
 754                 if (packed_git_window_size < 1)
 755                         packed_git_window_size = 1;
 756                 packed_git_window_size *= pgsz_x2;
 757                 return 0;
 758         }
 759
 760         if (!strcmp(var, "core.bigfilethreshold")) {
 761                 big_file_threshold = git_config_ulong(var, value);
 762                 return 0;
 763         }
 764
 765         if (!strcmp(var, "core.packedgitlimit")) {
 766                 packed_git_limit = git_config_ulong(var, value);
 767                 return 0;
 768         }
 769
 770         if (!strcmp(var, "core.deltabasecachelimit")) {
 771                 delta_base_cache_limit = git_config_ulong(var, value);
 772                 return 0;
 773         }
 774
 775         if (!strcmp(var, "core.autocrlf")) {
 776                 if (value && !strcasecmp(value, "input")) {
 777                         if (core_eol == EOL_CRLF)
 778                                 return error("core.autocrlf=input conflicts with core.eol=crlf");
 779                         auto_crlf = AUTO_CRLF_INPUT;
 780                         return 0;
 781                 }
 782                 auto_crlf = git_config_bool(var, value);
 783                 return 0;
 784         }
 785
 786         if (!strcmp(var, "core.safecrlf")) {
 787                 if (value && !strcasecmp(value, "warn")) {
 788                         safe_crlf = SAFE_CRLF_WARN;
 789                         return 0;
 790                 }
 791                 safe_crlf = git_config_bool(var, value);
 792                 return 0;
 793         }
 794
 795         if (!strcmp(var, "core.eol")) {
 796                 if (value && !strcasecmp(value, "lf"))
 797                         core_eol = EOL_LF;
 798                 else if (value && !strcasecmp(value, "crlf"))
 799                         core_eol = EOL_CRLF;
 800                 else if (value && !strcasecmp(value, "native"))
 801                         core_eol = EOL_NATIVE;
 802                 else
 803                         core_eol = EOL_UNSET;
 804                 if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 805                         return error("core.autocrlf=input conflicts with core.eol=crlf");
 806                 return 0;
 807         }
 808
 809         if (!strcmp(var, "core.notesref")) {
 810                 notes_ref_name = xstrdup(value);
 811                 return 0;
 812         }
 813
 814         if (!strcmp(var, "core.pager"))
 815                 return git_config_string(&pager_program, var, value);
 816
 817         if (!strcmp(var, "core.editor"))
 818                 return git_config_string(&editor_program, var, value);
 819
 820         if (!strcmp(var, "core.commentchar")) {
 821                 const char *comment;
 822                 int ret = git_config_string(&comment, var, value);
 823                 if (ret)
 824                         return ret;
 825                 else if (!strcasecmp(comment, "auto"))
 826                         auto_comment_line_char = 1;
 827                 else if (comment[0] && !comment[1]) {
 828                         comment_line_char = comment[0];
 829                         auto_comment_line_char = 0;
 830                 } else
 831                         return error("core.commentChar should only be one character");
 832                 return 0;
 833         }
 834
 835         if (!strcmp(var, "core.askpass"))
 836                 return git_config_string(&askpass_program, var, value);
 837
 838         if (!strcmp(var, "core.excludesfile"))
 839                 return git_config_pathname(&excludes_file, var, value);
 840
 841         if (!strcmp(var, "core.whitespace")) {
 842                 if (!value)
 843                         return config_error_nonbool(var);
 844                 whitespace_rule_cfg = parse_whitespace_rule(value);
 845                 return 0;
 846         }
 847
 848         if (!strcmp(var, "core.fsyncobjectfiles")) {
 849                 fsync_object_files = git_config_bool(var, value);
 850                 return 0;
 851         }
 852
 853         if (!strcmp(var, "core.preloadindex")) {
 854                 core_preload_index = git_config_bool(var, value);
 855                 return 0;
 856         }
 857
 858         if (!strcmp(var, "core.createobject")) {
 859                 if (!strcmp(value, "rename"))
 860                         object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 861                 else if (!strcmp(value, "link"))
 862                         object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 863                 else
 864                         die("Invalid mode for object creation: %s", value);
 865                 return 0;
 866         }
 867
 868         if (!strcmp(var, "core.sparsecheckout")) {
 869                 core_apply_sparse_checkout = git_config_bool(var, value);
 870                 return 0;
 871         }
 872
 873         if (!strcmp(var, "core.precomposeunicode")) {
 874                 precomposed_unicode = git_config_bool(var, value);
 875                 return 0;
 876         }
 877
 878         /* Add other config variables here and to Documentation/config.txt. */
 879         return 0;
 880 }
 881
 882 static int git_default_i18n_config(const char *var, const char *value)
 883 {
 884         if (!strcmp(var, "i18n.commitencoding"))
 885                 return git_config_string(&git_commit_encoding, var, value);
 886
 887         if (!strcmp(var, "i18n.logoutputencoding"))
 888                 return git_config_string(&git_log_output_encoding, var, value);
 889
 890         /* Add other config variables here and to Documentation/config.txt. */
 891         return 0;
 892 }
 893
 894 static int git_default_branch_config(const char *var, const char *value)
 895 {
 896         if (!strcmp(var, "branch.autosetupmerge")) {
 897                 if (value && !strcasecmp(value, "always")) {
 898                         git_branch_track = BRANCH_TRACK_ALWAYS;
 899                         return 0;
 900                 }
 901                 git_branch_track = git_config_bool(var, value);
 902                 return 0;
 903         }
 904         if (!strcmp(var, "branch.autosetuprebase")) {
 905                 if (!value)
 906                         return config_error_nonbool(var);
 907                 else if (!strcmp(value, "never"))
 908                         autorebase = AUTOREBASE_NEVER;
 909                 else if (!strcmp(value, "local"))
 910                         autorebase = AUTOREBASE_LOCAL;
 911                 else if (!strcmp(value, "remote"))
 912                         autorebase = AUTOREBASE_REMOTE;
 913                 else if (!strcmp(value, "always"))
 914                         autorebase = AUTOREBASE_ALWAYS;
 915                 else
 916                         return error("Malformed value for %s", var);
 917                 return 0;
 918         }
 919
 920         /* Add other config variables here and to Documentation/config.txt. */
 921         return 0;
 922 }
 923
 924 static int git_default_push_config(const char *var, const char *value)
 925 {
 926         if (!strcmp(var, "push.default")) {
 927                 if (!value)
 928                         return config_error_nonbool(var);
 929                 else if (!strcmp(value, "nothing"))
 930                         push_default = PUSH_DEFAULT_NOTHING;
 931                 else if (!strcmp(value, "matching"))
 932                         push_default = PUSH_DEFAULT_MATCHING;
 933                 else if (!strcmp(value, "simple"))
 934                         push_default = PUSH_DEFAULT_SIMPLE;
 935                 else if (!strcmp(value, "upstream"))
 936                         push_default = PUSH_DEFAULT_UPSTREAM;
 937                 else if (!strcmp(value, "tracking")) /* deprecated */
 938                         push_default = PUSH_DEFAULT_UPSTREAM;
 939                 else if (!strcmp(value, "current"))
 940                         push_default = PUSH_DEFAULT_CURRENT;
 941                 else {
 942                         error("Malformed value for %s: %s", var, value);
 943                         return error("Must be one of nothing, matching, simple, "
 944                                      "upstream or current.");
 945                 }
 946                 return 0;
 947         }
 948
 949         /* Add other config variables here and to Documentation/config.txt. */
 950         return 0;
 951 }
 952
 953 static int git_default_mailmap_config(const char *var, const char *value)
 954 {
 955         if (!strcmp(var, "mailmap.file"))
 956                 return git_config_pathname(&git_mailmap_file, var, value);
 957         if (!strcmp(var, "mailmap.blob"))
 958                 return git_config_string(&git_mailmap_blob, var, value);
 959
 960         /* Add other config variables here and to Documentation/config.txt. */
 961         return 0;
 962 }
 963
 964 int git_default_config(const char *var, const char *value, void *dummy)
 965 {
 966         if (starts_with(var, "core."))
 967                 return git_default_core_config(var, value);
 968
 969         if (starts_with(var, "user."))
 970                 return git_ident_config(var, value, dummy);
 971
 972         if (starts_with(var, "i18n."))
 973                 return git_default_i18n_config(var, value);
 974
 975         if (starts_with(var, "branch."))
 976                 return git_default_branch_config(var, value);
 977
 978         if (starts_with(var, "push."))
 979                 return git_default_push_config(var, value);
 980
 981         if (starts_with(var, "mailmap."))
 982                 return git_default_mailmap_config(var, value);
 983
 984         if (starts_with(var, "advice."))
 985                 return git_default_advice_config(var, value);
 986
 987         if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 988                 pager_use_color = git_config_bool(var,value);
 989                 return 0;
 990         }
 991
 992         if (!strcmp(var, "pack.packsizelimit")) {
 993                 pack_size_limit_cfg = git_config_ulong(var, value);
 994                 return 0;
 995         }
 996         /* Add other config variables here and to Documentation/config.txt. */
 997         return 0;
 998 }
 999
1000 /*
1001  * All source specific fields in the union, die_on_error, name and the callbacks
1002  * fgetc, ungetc, ftell of top need to be initialized before calling
1003  * this function.
1004  */
1005 static int do_config_from(struct config_source *top, config_fn_t fn, void *data)
1006 {
1007         int ret;
1008
1009         /* push config-file parsing state stack */
1010         top->prev = cf;
1011         top->linenr = 1;
1012         top->eof = 0;
1013         strbuf_init(&top->value, 1024);
1014         strbuf_init(&top->var, 1024);
1015         cf = top;
1016
1017         ret = git_parse_source(fn, data);
1018
1019         /* pop config-file parsing state stack */
1020         strbuf_release(&top->value);
1021         strbuf_release(&top->var);
1022         cf = top->prev;
1023
1024         return ret;
1025 }
1026
1027 static int do_config_from_file(config_fn_t fn,
1028                 const char *name, const char *path, FILE *f, void *data)
1029 {
1030         struct config_source top;
1031
1032         top.u.file = f;
1033         top.name = name;
1034         top.path = path;
1035         top.die_on_error = 1;
1036         top.do_fgetc = config_file_fgetc;
1037         top.do_ungetc = config_file_ungetc;
1038         top.do_ftell = config_file_ftell;
1039
1040         return do_config_from(&top, fn, data);
1041 }
1042
1043 static int git_config_from_stdin(config_fn_t fn, void *data)
1044 {
1045         return do_config_from_file(fn, "<stdin>", NULL, stdin, data);
1046 }
1047
1048 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
1049 {
1050         int ret = -1;
1051         FILE *f;
1052
1053         f = fopen(filename, "r");
1054         if (f) {
1055                 ret = do_config_from_file(fn, filename, filename, f, data);
1056                 fclose(f);
1057         }
1058         return ret;
1059 }
1060
1061 int git_config_from_buf(config_fn_t fn, const char *name, const char *buf,
1062                         size_t len, void *data)
1063 {
1064         struct config_source top;
1065
1066         top.u.buf.buf = buf;
1067         top.u.buf.len = len;
1068         top.u.buf.pos = 0;
1069         top.name = name;
1070         top.path = NULL;
1071         top.die_on_error = 0;
1072         top.do_fgetc = config_buf_fgetc;
1073         top.do_ungetc = config_buf_ungetc;
1074         top.do_ftell = config_buf_ftell;
1075
1076         return do_config_from(&top, fn, data);
1077 }
1078
1079 static int git_config_from_blob_sha1(config_fn_t fn,
1080                                      const char *name,
1081                                      const unsigned char *sha1,
1082                                      void *data)
1083 {
1084         enum object_type type;
1085         char *buf;
1086         unsigned long size;
1087         int ret;
1088
1089         buf = read_sha1_file(sha1, &type, &size);
1090         if (!buf)
1091                 return error("unable to load config blob object '%s'", name);
1092         if (type != OBJ_BLOB) {
1093                 free(buf);
1094                 return error("reference '%s' does not point to a blob", name);
1095         }
1096
1097         ret = git_config_from_buf(fn, name, buf, size, data);
1098         free(buf);
1099
1100         return ret;
1101 }
1102
1103 static int git_config_from_blob_ref(config_fn_t fn,
1104                                     const char *name,
1105                                     void *data)
1106 {
1107         unsigned char sha1[20];
1108
1109         if (get_sha1(name, sha1) < 0)
1110                 return error("unable to resolve config blob '%s'", name);
1111         return git_config_from_blob_sha1(fn, name, sha1, data);
1112 }
1113
1114 const char *git_etc_gitconfig(void)
1115 {
1116         static const char *system_wide;
1117         if (!system_wide)
1118                 system_wide = system_path(ETC_GITCONFIG);
1119         return system_wide;
1120 }
1121
1122 int git_env_bool(const char *k, int def)
1123 {
1124         const char *v = getenv(k);
1125         return v ? git_config_bool(k, v) : def;
1126 }
1127
1128 int git_config_system(void)
1129 {
1130         return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
1131 }
1132
1133 int git_config_early(config_fn_t fn, void *data, const char *repo_config)
1134 {
1135         int ret = 0, found = 0;
1136         char *xdg_config = NULL;
1137         char *user_config = NULL;
1138
1139         home_config_paths(&user_config, &xdg_config, "config");
1140
1141         if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0)) {
1142                 ret += git_config_from_file(fn, git_etc_gitconfig(),
1143                                             data);
1144                 found += 1;
1145         }
1146
1147         if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK)) {
1148                 ret += git_config_from_file(fn, xdg_config, data);
1149                 found += 1;
1150         }
1151
1152         if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK)) {
1153                 ret += git_config_from_file(fn, user_config, data);
1154                 found += 1;
1155         }
1156
1157         if (repo_config && !access_or_die(repo_config, R_OK, 0)) {
1158                 ret += git_config_from_file(fn, repo_config, data);
1159                 found += 1;
1160         }
1161
1162         switch (git_config_from_parameters(fn, data)) {
1163         case -1: /* error */
1164                 die("unable to parse command-line config");
1165                 break;
1166         case 0: /* found nothing */
1167                 break;
1168         default: /* found at least one item */
1169                 found++;
1170                 break;
1171         }
1172
1173         free(xdg_config);
1174         free(user_config);
1175         return ret == 0 ? found : ret;
1176 }
1177
1178 int git_config_with_options(config_fn_t fn, void *data,
1179                             struct git_config_source *config_source,
1180                             int respect_includes)
1181 {
1182         char *repo_config = NULL;
1183         int ret;
1184         struct config_include_data inc = CONFIG_INCLUDE_INIT;
1185
1186         if (respect_includes) {
1187                 inc.fn = fn;
1188                 inc.data = data;
1189                 fn = git_config_include;
1190                 data = &inc;
1191         }
1192
1193         /*
1194          * If we have a specific filename, use it. Otherwise, follow the
1195          * regular lookup sequence.
1196          */
1197         if (config_source && config_source->use_stdin)
1198                 return git_config_from_stdin(fn, data);
1199         else if (config_source && config_source->file)
1200                 return git_config_from_file(fn, config_source->file, data);
1201         else if (config_source && config_source->blob)
1202                 return git_config_from_blob_ref(fn, config_source->blob, data);
1203
1204         repo_config = git_pathdup("config");
1205         ret = git_config_early(fn, data, repo_config);
1206         if (repo_config)
1207                 free(repo_config);
1208         return ret;
1209 }
1210
1211 int git_config(config_fn_t fn, void *data)
1212 {
1213         return git_config_with_options(fn, data, NULL, 1);
1214 }
1215
1216 /*
1217  * Find all the stuff for git_config_set() below.
1218  */
1219
1220 static struct {
1221         int baselen;
1222         char *key;
1223         int do_not_match;
1224         regex_t *value_regex;
1225         int multi_replace;
1226         size_t *offset;
1227         unsigned int offset_alloc;
1228         enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1229         int seen;
1230 } store;
1231
1232 static int matches(const char *key, const char *value)
1233 {
1234         return !strcmp(key, store.key) &&
1235                 (store.value_regex == NULL ||
1236                  (store.do_not_match ^
1237                   !regexec(store.value_regex, value, 0, NULL, 0)));
1238 }
1239
1240 static int store_aux(const char *key, const char *value, void *cb)
1241 {
1242         const char *ep;
1243         size_t section_len;
1244
1245         switch (store.state) {
1246         case KEY_SEEN:
1247                 if (matches(key, value)) {
1248                         if (store.seen == 1 && store.multi_replace == 0) {
1249                                 warning("%s has multiple values", key);
1250                         }
1251
1252                         ALLOC_GROW(store.offset, store.seen + 1,
1253                                    store.offset_alloc);
1254
1255                         store.offset[store.seen] = cf->do_ftell(cf);
1256                         store.seen++;
1257                 }
1258                 break;
1259         case SECTION_SEEN:
1260                 /*
1261                  * What we are looking for is in store.key (both
1262                  * section and var), and its section part is baselen
1263                  * long.  We found key (again, both section and var).
1264                  * We would want to know if this key is in the same
1265                  * section as what we are looking for.  We already
1266                  * know we are in the same section as what should
1267                  * hold store.key.
1268                  */
1269                 ep = strrchr(key, '.');
1270                 section_len = ep - key;
1271
1272                 if ((section_len != store.baselen) ||
1273                     memcmp(key, store.key, section_len+1)) {
1274                         store.state = SECTION_END_SEEN;
1275                         break;
1276                 }
1277
1278                 /*
1279                  * Do not increment matches: this is no match, but we
1280                  * just made sure we are in the desired section.
1281                  */
1282                 ALLOC_GROW(store.offset, store.seen + 1,
1283                            store.offset_alloc);
1284                 store.offset[store.seen] = cf->do_ftell(cf);
1285                 /* fallthru */
1286         case SECTION_END_SEEN:
1287         case START:
1288                 if (matches(key, value)) {
1289                         ALLOC_GROW(store.offset, store.seen + 1,
1290                                    store.offset_alloc);
1291                         store.offset[store.seen] = cf->do_ftell(cf);
1292                         store.state = KEY_SEEN;
1293                         store.seen++;
1294                 } else {
1295                         if (strrchr(key, '.') - key == store.baselen &&
1296                               !strncmp(key, store.key, store.baselen)) {
1297                                         store.state = SECTION_SEEN;
1298                                         ALLOC_GROW(store.offset,
1299                                                    store.seen + 1,
1300                                                    store.offset_alloc);
1301                                         store.offset[store.seen] = cf->do_ftell(cf);
1302                         }
1303                 }
1304         }
1305         return 0;
1306 }
1307
1308 static int write_error(const char *filename)
1309 {
1310         error("failed to write new configuration file %s", filename);
1311
1312         /* Same error code as "failed to rename". */
1313         return 4;
1314 }
1315
1316 static int store_write_section(int fd, const char *key)
1317 {
1318         const char *dot;
1319         int i, success;
1320         struct strbuf sb = STRBUF_INIT;
1321
1322         dot = memchr(key, '.', store.baselen);
1323         if (dot) {
1324                 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1325                 for (i = dot - key + 1; i < store.baselen; i++) {
1326                         if (key[i] == '"' || key[i] == '\\')
1327                                 strbuf_addch(&sb, '\\');
1328                         strbuf_addch(&sb, key[i]);
1329                 }
1330                 strbuf_addstr(&sb, "\"]\n");
1331         } else {
1332                 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1333         }
1334
1335         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1336         strbuf_release(&sb);
1337
1338         return success;
1339 }
1340
1341 static int store_write_pair(int fd, const char *key, const char *value)
1342 {
1343         int i, success;
1344         int length = strlen(key + store.baselen + 1);
1345         const char *quote = "";
1346         struct strbuf sb = STRBUF_INIT;
1347
1348         /*
1349          * Check to see if the value needs to be surrounded with a dq pair.
1350          * Note that problematic characters are always backslash-quoted; this
1351          * check is about not losing leading or trailing SP and strings that
1352          * follow beginning-of-comment characters (i.e. ';' and '#') by the
1353          * configuration parser.
1354          */
1355         if (value[0] == ' ')
1356                 quote = "\"";
1357         for (i = 0; value[i]; i++)
1358                 if (value[i] == ';' || value[i] == '#')
1359                         quote = "\"";
1360         if (i && value[i - 1] == ' ')
1361                 quote = "\"";
1362
1363         strbuf_addf(&sb, "\t%.*s = %s",
1364                     length, key + store.baselen + 1, quote);
1365
1366         for (i = 0; value[i]; i++)
1367                 switch (value[i]) {
1368                 case '\n':
1369                         strbuf_addstr(&sb, "\\n");
1370                         break;
1371                 case '\t':
1372                         strbuf_addstr(&sb, "\\t");
1373                         break;
1374                 case '"':
1375                 case '\\':
1376                         strbuf_addch(&sb, '\\');
1377                 default:
1378                         strbuf_addch(&sb, value[i]);
1379                         break;
1380                 }
1381         strbuf_addf(&sb, "%s\n", quote);
1382
1383         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1384         strbuf_release(&sb);
1385
1386         return success;
1387 }
1388
1389 static ssize_t find_beginning_of_line(const char *contents, size_t size,
1390         size_t offset_, int *found_bracket)
1391 {
1392         size_t equal_offset = size, bracket_offset = size;
1393         ssize_t offset;
1394
1395 contline:
1396         for (offset = offset_-2; offset > 0
1397                         && contents[offset] != '\n'; offset--)
1398                 switch (contents[offset]) {
1399                         case '=': equal_offset = offset; break;
1400                         case ']': bracket_offset = offset; break;
1401                 }
1402         if (offset > 0 && contents[offset-1] == '\\') {
1403                 offset_ = offset;
1404                 goto contline;
1405         }
1406         if (bracket_offset < equal_offset) {
1407                 *found_bracket = 1;
1408                 offset = bracket_offset+1;
1409         } else
1410                 offset++;
1411
1412         return offset;
1413 }
1414
1415 int git_config_set_in_file(const char *config_filename,
1416                         const char *key, const char *value)
1417 {
1418         return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1419 }
1420
1421 int git_config_set(const char *key, const char *value)
1422 {
1423         return git_config_set_multivar(key, value, NULL, 0);
1424 }
1425
1426 /*
1427  * Auxiliary function to sanity-check and split the key into the section
1428  * identifier and variable name.
1429  *
1430  * Returns 0 on success, -1 when there is an invalid character in the key and
1431  * -2 if there is no section name in the key.
1432  *
1433  * store_key - pointer to char* which will hold a copy of the key with
1434  *             lowercase section and variable name
1435  * baselen - pointer to int which will hold the length of the
1436  *           section + subsection part, can be NULL
1437  */
1438 int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1439 {
1440         int i, dot, baselen;
1441         const char *last_dot = strrchr(key, '.');
1442
1443         /*
1444          * Since "key" actually contains the section name and the real
1445          * key name separated by a dot, we have to know where the dot is.
1446          */
1447
1448         if (last_dot == NULL || last_dot == key) {
1449                 error("key does not contain a section: %s", key);
1450                 return -CONFIG_NO_SECTION_OR_NAME;
1451         }
1452
1453         if (!last_dot[1]) {
1454                 error("key does not contain variable name: %s", key);
1455                 return -CONFIG_NO_SECTION_OR_NAME;
1456         }
1457
1458         baselen = last_dot - key;
1459         if (baselen_)
1460                 *baselen_ = baselen;
1461
1462         /*
1463          * Validate the key and while at it, lower case it for matching.
1464          */
1465         *store_key = xmalloc(strlen(key) + 1);
1466
1467         dot = 0;
1468         for (i = 0; key[i]; i++) {
1469                 unsigned char c = key[i];
1470                 if (c == '.')
1471                         dot = 1;
1472                 /* Leave the extended basename untouched.. */
1473                 if (!dot || i > baselen) {
1474                         if (!iskeychar(c) ||
1475                             (i == baselen + 1 && !isalpha(c))) {
1476                                 error("invalid key: %s", key);
1477                                 goto out_free_ret_1;
1478                         }
1479                         c = tolower(c);
1480                 } else if (c == '\n') {
1481                         error("invalid key (newline): %s", key);
1482                         goto out_free_ret_1;
1483                 }
1484                 (*store_key)[i] = c;
1485         }
1486         (*store_key)[i] = 0;
1487
1488         return 0;
1489
1490 out_free_ret_1:
1491         free(*store_key);
1492         *store_key = NULL;
1493         return -CONFIG_INVALID_KEY;
1494 }
1495
1496 /*
1497  * If value==NULL, unset in (remove from) config,
1498  * if value_regex!=NULL, disregard key/value pairs where value does not match.
1499  * if multi_replace==0, nothing, or only one matching key/value is replaced,
1500  *     else all matching key/values (regardless how many) are removed,
1501  *     before the new pair is written.
1502  *
1503  * Returns 0 on success.
1504  *
1505  * This function does this:
1506  *
1507  * - it locks the config file by creating ".git/config.lock"
1508  *
1509  * - it then parses the config using store_aux() as validator to find
1510  *   the position on the key/value pair to replace. If it is to be unset,
1511  *   it must be found exactly once.
1512  *
1513  * - the config file is mmap()ed and the part before the match (if any) is
1514  *   written to the lock file, then the changed part and the rest.
1515  *
1516  * - the config file is removed and the lock file rename()d to it.
1517  *
1518  */
1519 int git_config_set_multivar_in_file(const char *config_filename,
1520                                 const char *key, const char *value,
1521                                 const char *value_regex, int multi_replace)
1522 {
1523         int fd = -1, in_fd;
1524         int ret;
1525         struct lock_file *lock = NULL;
1526         char *filename_buf = NULL;
1527
1528         /* parse-key returns negative; flip the sign to feed exit(3) */
1529         ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1530         if (ret)
1531                 goto out_free;
1532
1533         store.multi_replace = multi_replace;
1534
1535         if (!config_filename)
1536                 config_filename = filename_buf = git_pathdup("config");
1537
1538         /*
1539          * The lock serves a purpose in addition to locking: the new
1540          * contents of .git/config will be written into it.
1541          */
1542         lock = xcalloc(1, sizeof(struct lock_file));
1543         fd = hold_lock_file_for_update(lock, config_filename, 0);
1544         if (fd < 0) {
1545                 error("could not lock config file %s: %s", config_filename, strerror(errno));
1546                 free(store.key);
1547                 ret = CONFIG_NO_LOCK;
1548                 goto out_free;
1549         }
1550
1551         /*
1552          * If .git/config does not exist yet, write a minimal version.
1553          */
1554         in_fd = open(config_filename, O_RDONLY);
1555         if ( in_fd < 0 ) {
1556                 free(store.key);
1557
1558                 if ( ENOENT != errno ) {
1559                         error("opening %s: %s", config_filename,
1560                               strerror(errno));
1561                         ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1562                         goto out_free;
1563                 }
1564                 /* if nothing to unset, error out */
1565                 if (value == NULL) {
1566                         ret = CONFIG_NOTHING_SET;
1567                         goto out_free;
1568                 }
1569
1570                 store.key = (char *)key;
1571                 if (!store_write_section(fd, key) ||
1572                     !store_write_pair(fd, key, value))
1573                         goto write_err_out;
1574         } else {
1575                 struct stat st;
1576                 char *contents;
1577                 size_t contents_sz, copy_begin, copy_end;
1578                 int i, new_line = 0;
1579
1580                 if (value_regex == NULL)
1581                         store.value_regex = NULL;
1582                 else {
1583                         if (value_regex[0] == '!') {
1584                                 store.do_not_match = 1;
1585                                 value_regex++;
1586                         } else
1587                                 store.do_not_match = 0;
1588
1589                         store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1590                         if (regcomp(store.value_regex, value_regex,
1591                                         REG_EXTENDED)) {
1592                                 error("invalid pattern: %s", value_regex);
1593                                 free(store.value_regex);
1594                                 ret = CONFIG_INVALID_PATTERN;
1595                                 goto out_free;
1596                         }
1597                 }
1598
1599                 ALLOC_GROW(store.offset, 1, store.offset_alloc);
1600                 store.offset[0] = 0;
1601                 store.state = START;
1602                 store.seen = 0;
1603
1604                 /*
1605                  * After this, store.offset will contain the *end* offset
1606                  * of the last match, or remain at 0 if no match was found.
1607                  * As a side effect, we make sure to transform only a valid
1608                  * existing config file.
1609                  */
1610                 if (git_config_from_file(store_aux, config_filename, NULL)) {
1611                         error("invalid config file %s", config_filename);
1612                         free(store.key);
1613                         if (store.value_regex != NULL) {
1614                                 regfree(store.value_regex);
1615                                 free(store.value_regex);
1616                         }
1617                         ret = CONFIG_INVALID_FILE;
1618                         goto out_free;
1619                 }
1620
1621                 free(store.key);
1622                 if (store.value_regex != NULL) {
1623                         regfree(store.value_regex);
1624                         free(store.value_regex);
1625                 }
1626
1627                 /* if nothing to unset, or too many matches, error out */
1628                 if ((store.seen == 0 && value == NULL) ||
1629                                 (store.seen > 1 && multi_replace == 0)) {
1630                         ret = CONFIG_NOTHING_SET;
1631                         goto out_free;
1632                 }
1633
1634                 fstat(in_fd, &st);
1635                 contents_sz = xsize_t(st.st_size);
1636                 contents = xmmap(NULL, contents_sz, PROT_READ,
1637                         MAP_PRIVATE, in_fd, 0);
1638                 close(in_fd);
1639
1640                 if (fchmod(fd, st.st_mode & 07777) < 0) {
1641                         error("fchmod on %s failed: %s",
1642                                 lock->filename, strerror(errno));
1643                         ret = CONFIG_NO_WRITE;
1644                         goto out_free;
1645                 }
1646
1647                 if (store.seen == 0)
1648                         store.seen = 1;
1649
1650                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1651                         if (store.offset[i] == 0) {
1652                                 store.offset[i] = copy_end = contents_sz;
1653                         } else if (store.state != KEY_SEEN) {
1654                                 copy_end = store.offset[i];
1655                         } else
1656                                 copy_end = find_beginning_of_line(
1657                                         contents, contents_sz,
1658                                         store.offset[i]-2, &new_line);
1659
1660                         if (copy_end > 0 && contents[copy_end-1] != '\n')
1661                                 new_line = 1;
1662
1663                         /* write the first part of the config */
1664                         if (copy_end > copy_begin) {
1665                                 if (write_in_full(fd, contents + copy_begin,
1666                                                   copy_end - copy_begin) <
1667                                     copy_end - copy_begin)
1668                                         goto write_err_out;
1669                                 if (new_line &&
1670                                     write_str_in_full(fd, "\n") != 1)
1671                                         goto write_err_out;
1672                         }
1673                         copy_begin = store.offset[i];
1674                 }
1675
1676                 /* write the pair (value == NULL means unset) */
1677                 if (value != NULL) {
1678                         if (store.state == START) {
1679                                 if (!store_write_section(fd, key))
1680                                         goto write_err_out;
1681                         }
1682                         if (!store_write_pair(fd, key, value))
1683                                 goto write_err_out;
1684                 }
1685
1686                 /* write the rest of the config */
1687                 if (copy_begin < contents_sz)
1688                         if (write_in_full(fd, contents + copy_begin,
1689                                           contents_sz - copy_begin) <
1690                             contents_sz - copy_begin)
1691                                 goto write_err_out;
1692
1693                 munmap(contents, contents_sz);
1694         }
1695
1696         if (commit_lock_file(lock) < 0) {
1697                 error("could not commit config file %s", config_filename);
1698                 ret = CONFIG_NO_WRITE;
1699                 goto out_free;
1700         }
1701
1702         /*
1703          * lock is committed, so don't try to roll it back below.
1704          * NOTE: Since lockfile.c keeps a linked list of all created
1705          * lock_file structures, it isn't safe to free(lock).  It's
1706          * better to just leave it hanging around.
1707          */
1708         lock = NULL;
1709         ret = 0;
1710
1711 out_free:
1712         if (lock)
1713                 rollback_lock_file(lock);
1714         free(filename_buf);
1715         return ret;
1716
1717 write_err_out:
1718         ret = write_error(lock->filename);
1719         goto out_free;
1720
1721 }
1722
1723 int git_config_set_multivar(const char *key, const char *value,
1724                         const char *value_regex, int multi_replace)
1725 {
1726         return git_config_set_multivar_in_file(NULL, key, value, value_regex,
1727                                                multi_replace);
1728 }
1729
1730 static int section_name_match (const char *buf, const char *name)
1731 {
1732         int i = 0, j = 0, dot = 0;
1733         if (buf[i] != '[')
1734                 return 0;
1735         for (i = 1; buf[i] && buf[i] != ']'; i++) {
1736                 if (!dot && isspace(buf[i])) {
1737                         dot = 1;
1738                         if (name[j++] != '.')
1739                                 break;
1740                         for (i++; isspace(buf[i]); i++)
1741                                 ; /* do nothing */
1742                         if (buf[i] != '"')
1743                                 break;
1744                         continue;
1745                 }
1746                 if (buf[i] == '\\' && dot)
1747                         i++;
1748                 else if (buf[i] == '"' && dot) {
1749                         for (i++; isspace(buf[i]); i++)
1750                                 ; /* do_nothing */
1751                         break;
1752                 }
1753                 if (buf[i] != name[j++])
1754                         break;
1755         }
1756         if (buf[i] == ']' && name[j] == 0) {
1757                 /*
1758                  * We match, now just find the right length offset by
1759                  * gobbling up any whitespace after it, as well
1760                  */
1761                 i++;
1762                 for (; buf[i] && isspace(buf[i]); i++)
1763                         ; /* do nothing */
1764                 return i;
1765         }
1766         return 0;
1767 }
1768
1769 static int section_name_is_ok(const char *name)
1770 {
1771         /* Empty section names are bogus. */
1772         if (!*name)
1773                 return 0;
1774
1775         /*
1776          * Before a dot, we must be alphanumeric or dash. After the first dot,
1777          * anything goes, so we can stop checking.
1778          */
1779         for (; *name && *name != '.'; name++)
1780                 if (*name != '-' && !isalnum(*name))
1781                         return 0;
1782         return 1;
1783 }
1784
1785 /* if new_name == NULL, the section is removed instead */
1786 int git_config_rename_section_in_file(const char *config_filename,
1787                                       const char *old_name, const char *new_name)
1788 {
1789         int ret = 0, remove = 0;
1790         char *filename_buf = NULL;
1791         struct lock_file *lock;
1792         int out_fd;
1793         char buf[1024];
1794         FILE *config_file;
1795         struct stat st;
1796
1797         if (new_name && !section_name_is_ok(new_name)) {
1798                 ret = error("invalid section name: %s", new_name);
1799                 goto out;
1800         }
1801
1802         if (!config_filename)
1803                 config_filename = filename_buf = git_pathdup("config");
1804
1805         lock = xcalloc(1, sizeof(struct lock_file));
1806         out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1807         if (out_fd < 0) {
1808                 ret = error("could not lock config file %s", config_filename);
1809                 goto out;
1810         }
1811
1812         if (!(config_file = fopen(config_filename, "rb"))) {
1813                 /* no config file means nothing to rename, no error */
1814                 goto unlock_and_out;
1815         }
1816
1817         fstat(fileno(config_file), &st);
1818
1819         if (fchmod(out_fd, st.st_mode & 07777) < 0) {
1820                 ret = error("fchmod on %s failed: %s",
1821                                 lock->filename, strerror(errno));
1822                 goto out;
1823         }
1824
1825         while (fgets(buf, sizeof(buf), config_file)) {
1826                 int i;
1827                 int length;
1828                 char *output = buf;
1829                 for (i = 0; buf[i] && isspace(buf[i]); i++)
1830                         ; /* do nothing */
1831                 if (buf[i] == '[') {
1832                         /* it's a section */
1833                         int offset = section_name_match(&buf[i], old_name);
1834                         if (offset > 0) {
1835                                 ret++;
1836                                 if (new_name == NULL) {
1837                                         remove = 1;
1838                                         continue;
1839                                 }
1840                                 store.baselen = strlen(new_name);
1841                                 if (!store_write_section(out_fd, new_name)) {
1842                                         ret = write_error(lock->filename);
1843                                         goto out;
1844                                 }
1845                                 /*
1846                                  * We wrote out the new section, with
1847                                  * a newline, now skip the old
1848                                  * section's length
1849                                  */
1850                                 output += offset + i;
1851                                 if (strlen(output) > 0) {
1852                                         /*
1853                                          * More content means there's
1854                                          * a declaration to put on the
1855                                          * next line; indent with a
1856                                          * tab
1857                                          */
1858                                         output -= 1;
1859                                         output[0] = '\t';
1860                                 }
1861                         }
1862                         remove = 0;
1863                 }
1864                 if (remove)
1865                         continue;
1866                 length = strlen(output);
1867                 if (write_in_full(out_fd, output, length) != length) {
1868                         ret = write_error(lock->filename);
1869                         goto out;
1870                 }
1871         }
1872         fclose(config_file);
1873 unlock_and_out:
1874         if (commit_lock_file(lock) < 0)
1875                 ret = error("could not commit config file %s", config_filename);
1876 out:
1877         free(filename_buf);
1878         return ret;
1879 }
1880
1881 int git_config_rename_section(const char *old_name, const char *new_name)
1882 {
1883         return git_config_rename_section_in_file(NULL, old_name, new_name);
1884 }
1885
1886 /*
1887  * Call this to report error for your variable that should not
1888  * get a boolean value (i.e. "[my] var" means "true").
1889  */
1890 #undef config_error_nonbool
1891 int config_error_nonbool(const char *var)
1892 {
1893         return error("Missing value for '%s'", var);
1894 }
1895
1896 int parse_config_key(const char *var,
1897                      const char *section,
1898                      const char **subsection, int *subsection_len,
1899                      const char **key)
1900 {
1901         int section_len = strlen(section);
1902         const char *dot;
1903
1904         /* Does it start with "section." ? */
1905         if (!starts_with(var, section) || var[section_len] != '.')
1906                 return -1;
1907
1908         /*
1909          * Find the key; we don't know yet if we have a subsection, but we must
1910          * parse backwards from the end, since the subsection may have dots in
1911          * it, too.
1912          */
1913         dot = strrchr(var, '.');
1914         *key = dot + 1;
1915
1916         /* Did we have a subsection at all? */
1917         if (dot == var + section_len) {
1918                 *subsection = NULL;
1919                 *subsection_len = 0;
1920         }
1921         else {
1922                 *subsection = var + section_len + 1;
1923                 *subsection_len = dot - *subsection;
1924         }
1925
1926         return 0;
1927 }