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         if (!skip_prefix(var, "include.", &type))
 142                 return ret;
 143
 144         if (!strcmp(type, "path"))
 145                 ret = handle_path_include(value, inc);
 146         return ret;
 147 }
 148
 149 void git_config_push_parameter(const char *text)
 150 {
 151         struct strbuf env = STRBUF_INIT;
 152         const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
 153         if (old) {
 154                 strbuf_addstr(&env, old);
 155                 strbuf_addch(&env, ' ');
 156         }
 157         sq_quote_buf(&env, text);
 158         setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
 159         strbuf_release(&env);
 160 }
 161
 162 int git_config_parse_parameter(const char *text,
 163                                config_fn_t fn, void *data)
 164 {
 165         const char *value;
 166         struct strbuf **pair;
 167
 168         pair = strbuf_split_str(text, '=', 2);
 169         if (!pair[0])
 170                 return error("bogus config parameter: %s", text);
 171
 172         if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=') {
 173                 strbuf_setlen(pair[0], pair[0]->len - 1);
 174                 value = pair[1] ? pair[1]->buf : "";
 175         } else {
 176                 value = NULL;
 177         }
 178
 179         strbuf_trim(pair[0]);
 180         if (!pair[0]->len) {
 181                 strbuf_list_free(pair);
 182                 return error("bogus config parameter: %s", text);
 183         }
 184         strbuf_tolower(pair[0]);
 185         if (fn(pair[0]->buf, value, data) < 0) {
 186                 strbuf_list_free(pair);
 187                 return -1;
 188         }
 189         strbuf_list_free(pair);
 190         return 0;
 191 }
 192
 193 int git_config_from_parameters(config_fn_t fn, void *data)
 194 {
 195         const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 196         char *envw;
 197         const char **argv = NULL;
 198         int nr = 0, alloc = 0;
 199         int i;
 200
 201         if (!env)
 202                 return 0;
 203         /* sq_dequote will write over it */
 204         envw = xstrdup(env);
 205
 206         if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 207                 free(envw);
 208                 return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
 209         }
 210
 211         for (i = 0; i < nr; i++) {
 212                 if (git_config_parse_parameter(argv[i], fn, data) < 0) {
 213                         free(argv);
 214                         free(envw);
 215                         return -1;
 216                 }
 217         }
 218
 219         free(argv);
 220         free(envw);
 221         return nr > 0;
 222 }
 223
 224 static int get_next_char(void)
 225 {
 226         int c = cf->do_fgetc(cf);
 227
 228         if (c == '\r') {
 229                 /* DOS like systems */
 230                 c = cf->do_fgetc(cf);
 231                 if (c != '\n') {
 232                         cf->do_ungetc(c, cf);
 233                         c = '\r';
 234                 }
 235         }
 236         if (c == '\n')
 237                 cf->linenr++;
 238         if (c == EOF) {
 239                 cf->eof = 1;
 240                 c = '\n';
 241         }
 242         return c;
 243 }
 244
 245 static char *parse_value(void)
 246 {
 247         int quote = 0, comment = 0, space = 0;
 248
 249         strbuf_reset(&cf->value);
 250         for (;;) {
 251                 int c = get_next_char();
 252                 if (c == '\n') {
 253                         if (quote) {
 254                                 cf->linenr--;
 255                                 return NULL;
 256                         }
 257                         return cf->value.buf;
 258                 }
 259                 if (comment)
 260                         continue;
 261                 if (isspace(c) && !quote) {
 262                         if (cf->value.len)
 263                                 space++;
 264                         continue;
 265                 }
 266                 if (!quote) {
 267                         if (c == ';' || c == '#') {
 268                                 comment = 1;
 269                                 continue;
 270                         }
 271                 }
 272                 for (; space; space--)
 273                         strbuf_addch(&cf->value, ' ');
 274                 if (c == '\\') {
 275                         c = get_next_char();
 276                         switch (c) {
 277                         case '\n':
 278                                 continue;
 279                         case 't':
 280                                 c = '\t';
 281                                 break;
 282                         case 'b':
 283                                 c = '\b';
 284                                 break;
 285                         case 'n':
 286                                 c = '\n';
 287                                 break;
 288                         /* Some characters escape as themselves */
 289                         case '\\': case '"':
 290                                 break;
 291                         /* Reject unknown escape sequences */
 292                         default:
 293                                 return NULL;
 294                         }
 295                         strbuf_addch(&cf->value, c);
 296                         continue;
 297                 }
 298                 if (c == '"') {
 299                         quote = 1-quote;
 300                         continue;
 301                 }
 302                 strbuf_addch(&cf->value, c);
 303         }
 304 }
 305
 306 static inline int iskeychar(int c)
 307 {
 308         return isalnum(c) || c == '-';
 309 }
 310
 311 static int get_value(config_fn_t fn, void *data, struct strbuf *name)
 312 {
 313         int c;
 314         char *value;
 315
 316         /* Get the full name */
 317         for (;;) {
 318                 c = get_next_char();
 319                 if (cf->eof)
 320                         break;
 321                 if (!iskeychar(c))
 322                         break;
 323                 strbuf_addch(name, tolower(c));
 324         }
 325
 326         while (c == ' ' || c == '\t')
 327                 c = get_next_char();
 328
 329         value = NULL;
 330         if (c != '\n') {
 331                 if (c != '=')
 332                         return -1;
 333                 value = parse_value();
 334                 if (!value)
 335                         return -1;
 336         }
 337         return fn(name->buf, value, data);
 338 }
 339
 340 static int get_extended_base_var(struct strbuf *name, int c)
 341 {
 342         do {
 343                 if (c == '\n')
 344                         goto error_incomplete_line;
 345                 c = get_next_char();
 346         } while (isspace(c));
 347
 348         /* We require the format to be '[base "extension"]' */
 349         if (c != '"')
 350                 return -1;
 351         strbuf_addch(name, '.');
 352
 353         for (;;) {
 354                 int c = get_next_char();
 355                 if (c == '\n')
 356                         goto error_incomplete_line;
 357                 if (c == '"')
 358                         break;
 359                 if (c == '\\') {
 360                         c = get_next_char();
 361                         if (c == '\n')
 362                                 goto error_incomplete_line;
 363                 }
 364                 strbuf_addch(name, c);
 365         }
 366
 367         /* Final ']' */
 368         if (get_next_char() != ']')
 369                 return -1;
 370         return 0;
 371 error_incomplete_line:
 372         cf->linenr--;
 373         return -1;
 374 }
 375
 376 static int get_base_var(struct strbuf *name)
 377 {
 378         for (;;) {
 379                 int c = get_next_char();
 380                 if (cf->eof)
 381                         return -1;
 382                 if (c == ']')
 383                         return 0;
 384                 if (isspace(c))
 385                         return get_extended_base_var(name, c);
 386                 if (!iskeychar(c) && c != '.')
 387                         return -1;
 388                 strbuf_addch(name, tolower(c));
 389         }
 390 }
 391
 392 static int git_parse_source(config_fn_t fn, void *data)
 393 {
 394         int comment = 0;
 395         int baselen = 0;
 396         struct strbuf *var = &cf->var;
 397
 398         /* U+FEFF Byte Order Mark in UTF8 */
 399         static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 400         const unsigned char *bomptr = utf8_bom;
 401
 402         for (;;) {
 403                 int c = get_next_char();
 404                 if (bomptr && *bomptr) {
 405                         /* We are at the file beginning; skip UTF8-encoded BOM
 406                          * if present. Sane editors won't put this in on their
 407                          * own, but e.g. Windows Notepad will do it happily. */
 408                         if ((unsigned char) c == *bomptr) {
 409                                 bomptr++;
 410                                 continue;
 411                         } else {
 412                                 /* Do not tolerate partial BOM. */
 413                                 if (bomptr != utf8_bom)
 414                                         break;
 415                                 /* No BOM at file beginning. Cool. */
 416                                 bomptr = NULL;
 417                         }
 418                 }
 419                 if (c == '\n') {
 420                         if (cf->eof)
 421                                 return 0;
 422                         comment = 0;
 423                         continue;
 424                 }
 425                 if (comment || isspace(c))
 426                         continue;
 427                 if (c == '#' || c == ';') {
 428                         comment = 1;
 429                         continue;
 430                 }
 431                 if (c == '[') {
 432                         /* Reset prior to determining a new stem */
 433                         strbuf_reset(var);
 434                         if (get_base_var(var) < 0 || var->len < 1)
 435                                 break;
 436                         strbuf_addch(var, '.');
 437                         baselen = var->len;
 438                         continue;
 439                 }
 440                 if (!isalpha(c))
 441                         break;
 442                 /*
 443                  * Truncate the var name back to the section header
 444                  * stem prior to grabbing the suffix part of the name
 445                  * and the value.
 446                  */
 447                 strbuf_setlen(var, baselen);
 448                 strbuf_addch(var, tolower(c));
 449                 if (get_value(fn, data, var) < 0)
 450                         break;
 451         }
 452         if (cf->die_on_error)
 453                 die("bad config file line %d in %s", cf->linenr, cf->name);
 454         else
 455                 return error("bad config file line %d in %s", cf->linenr, cf->name);
 456 }
 457
 458 static int parse_unit_factor(const char *end, uintmax_t *val)
 459 {
 460         if (!*end)
 461                 return 1;
 462         else if (!strcasecmp(end, "k")) {
 463                 *val *= 1024;
 464                 return 1;
 465         }
 466         else if (!strcasecmp(end, "m")) {
 467                 *val *= 1024 * 1024;
 468                 return 1;
 469         }
 470         else if (!strcasecmp(end, "g")) {
 471                 *val *= 1024 * 1024 * 1024;
 472                 return 1;
 473         }
 474         return 0;
 475 }
 476
 477 static int git_parse_signed(const char *value, intmax_t *ret, intmax_t max)
 478 {
 479         if (value && *value) {
 480                 char *end;
 481                 intmax_t val;
 482                 uintmax_t uval;
 483                 uintmax_t factor = 1;
 484
 485                 errno = 0;
 486                 val = strtoimax(value, &end, 0);
 487                 if (errno == ERANGE)
 488                         return 0;
 489                 if (!parse_unit_factor(end, &factor)) {
 490                         errno = EINVAL;
 491                         return 0;
 492                 }
 493                 uval = abs(val);
 494                 uval *= factor;
 495                 if (uval > max || abs(val) > uval) {
 496                         errno = ERANGE;
 497                         return 0;
 498                 }
 499                 val *= factor;
 500                 *ret = val;
 501                 return 1;
 502         }
 503         errno = EINVAL;
 504         return 0;
 505 }
 506
 507 static int git_parse_unsigned(const char *value, uintmax_t *ret, uintmax_t max)
 508 {
 509         if (value && *value) {
 510                 char *end;
 511                 uintmax_t val;
 512                 uintmax_t oldval;
 513
 514                 errno = 0;
 515                 val = strtoumax(value, &end, 0);
 516                 if (errno == ERANGE)
 517                         return 0;
 518                 oldval = val;
 519                 if (!parse_unit_factor(end, &val)) {
 520                         errno = EINVAL;
 521                         return 0;
 522                 }
 523                 if (val > max || oldval > val) {
 524                         errno = ERANGE;
 525                         return 0;
 526                 }
 527                 *ret = val;
 528                 return 1;
 529         }
 530         errno = EINVAL;
 531         return 0;
 532 }
 533
 534 static int git_parse_int(const char *value, int *ret)
 535 {
 536         intmax_t tmp;
 537         if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int)))
 538                 return 0;
 539         *ret = tmp;
 540         return 1;
 541 }
 542
 543 static int git_parse_int64(const char *value, int64_t *ret)
 544 {
 545         intmax_t tmp;
 546         if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int64_t)))
 547                 return 0;
 548         *ret = tmp;
 549         return 1;
 550 }
 551
 552 int git_parse_ulong(const char *value, unsigned long *ret)
 553 {
 554         uintmax_t tmp;
 555         if (!git_parse_unsigned(value, &tmp, maximum_unsigned_value_of_type(long)))
 556                 return 0;
 557         *ret = tmp;
 558         return 1;
 559 }
 560
 561 NORETURN
 562 static void die_bad_number(const char *name, const char *value)
 563 {
 564         const char *reason = errno == ERANGE ?
 565                              "out of range" :
 566                              "invalid unit";
 567         if (!value)
 568                 value = "";
 569
 570         if (cf && cf->name)
 571                 die("bad numeric config value '%s' for '%s' in %s: %s",
 572                     value, name, cf->name, reason);
 573         die("bad numeric config value '%s' for '%s': %s", value, name, reason);
 574 }
 575
 576 int git_config_int(const char *name, const char *value)
 577 {
 578         int ret;
 579         if (!git_parse_int(value, &ret))
 580                 die_bad_number(name, value);
 581         return ret;
 582 }
 583
 584 int64_t git_config_int64(const char *name, const char *value)
 585 {
 586         int64_t ret;
 587         if (!git_parse_int64(value, &ret))
 588                 die_bad_number(name, value);
 589         return ret;
 590 }
 591
 592 unsigned long git_config_ulong(const char *name, const char *value)
 593 {
 594         unsigned long ret;
 595         if (!git_parse_ulong(value, &ret))
 596                 die_bad_number(name, value);
 597         return ret;
 598 }
 599
 600 static int git_config_maybe_bool_text(const char *name, const char *value)
 601 {
 602         if (!value)
 603                 return 1;
 604         if (!*value)
 605                 return 0;
 606         if (!strcasecmp(value, "true")
 607             || !strcasecmp(value, "yes")
 608             || !strcasecmp(value, "on"))
 609                 return 1;
 610         if (!strcasecmp(value, "false")
 611             || !strcasecmp(value, "no")
 612             || !strcasecmp(value, "off"))
 613                 return 0;
 614         return -1;
 615 }
 616
 617 int git_config_maybe_bool(const char *name, const char *value)
 618 {
 619         int v = git_config_maybe_bool_text(name, value);
 620         if (0 <= v)
 621                 return v;
 622         if (git_parse_int(value, &v))
 623                 return !!v;
 624         return -1;
 625 }
 626
 627 int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 628 {
 629         int v = git_config_maybe_bool_text(name, value);
 630         if (0 <= v) {
 631                 *is_bool = 1;
 632                 return v;
 633         }
 634         *is_bool = 0;
 635         return git_config_int(name, value);
 636 }
 637
 638 int git_config_bool(const char *name, const char *value)
 639 {
 640         int discard;
 641         return !!git_config_bool_or_int(name, value, &discard);
 642 }
 643
 644 int git_config_string(const char **dest, const char *var, const char *value)
 645 {
 646         if (!value)
 647                 return config_error_nonbool(var);
 648         *dest = xstrdup(value);
 649         return 0;
 650 }
 651
 652 int git_config_pathname(const char **dest, const char *var, const char *value)
 653 {
 654         if (!value)
 655                 return config_error_nonbool(var);
 656         *dest = expand_user_path(value);
 657         if (!*dest)
 658                 die("Failed to expand user dir in: '%s'", value);
 659         return 0;
 660 }
 661
 662 static int git_default_core_config(const char *var, const char *value)
 663 {
 664         /* This needs a better name */
 665         if (!strcmp(var, "core.filemode")) {
 666                 trust_executable_bit = git_config_bool(var, value);
 667                 return 0;
 668         }
 669         if (!strcmp(var, "core.trustctime")) {
 670                 trust_ctime = git_config_bool(var, value);
 671                 return 0;
 672         }
 673         if (!strcmp(var, "core.checkstat")) {
 674                 if (!strcasecmp(value, "default"))
 675                         check_stat = 1;
 676                 else if (!strcasecmp(value, "minimal"))
 677                         check_stat = 0;
 678         }
 679
 680         if (!strcmp(var, "core.quotepath")) {
 681                 quote_path_fully = git_config_bool(var, value);
 682                 return 0;
 683         }
 684
 685         if (!strcmp(var, "core.symlinks")) {
 686                 has_symlinks = git_config_bool(var, value);
 687                 return 0;
 688         }
 689
 690         if (!strcmp(var, "core.ignorecase")) {
 691                 ignore_case = git_config_bool(var, value);
 692                 return 0;
 693         }
 694
 695         if (!strcmp(var, "core.attributesfile"))
 696                 return git_config_pathname(&git_attributes_file, var, value);
 697
 698         if (!strcmp(var, "core.bare")) {
 699                 is_bare_repository_cfg = git_config_bool(var, value);
 700                 return 0;
 701         }
 702
 703         if (!strcmp(var, "core.ignorestat")) {
 704                 assume_unchanged = git_config_bool(var, value);
 705                 return 0;
 706         }
 707
 708         if (!strcmp(var, "core.prefersymlinkrefs")) {
 709                 prefer_symlink_refs = git_config_bool(var, value);
 710                 return 0;
 711         }
 712
 713         if (!strcmp(var, "core.logallrefupdates")) {
 714                 log_all_ref_updates = git_config_bool(var, value);
 715                 return 0;
 716         }
 717
 718         if (!strcmp(var, "core.warnambiguousrefs")) {
 719                 warn_ambiguous_refs = git_config_bool(var, value);
 720                 return 0;
 721         }
 722
 723         if (!strcmp(var, "core.abbrev")) {
 724                 int abbrev = git_config_int(var, value);
 725                 if (abbrev < minimum_abbrev || abbrev > 40)
 726                         return -1;
 727                 default_abbrev = abbrev;
 728                 return 0;
 729         }
 730
 731         if (!strcmp(var, "core.loosecompression")) {
 732                 int level = git_config_int(var, value);
 733                 if (level == -1)
 734                         level = Z_DEFAULT_COMPRESSION;
 735                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 736                         die("bad zlib compression level %d", level);
 737                 zlib_compression_level = level;
 738                 zlib_compression_seen = 1;
 739                 return 0;
 740         }
 741
 742         if (!strcmp(var, "core.compression")) {
 743                 int level = git_config_int(var, value);
 744                 if (level == -1)
 745                         level = Z_DEFAULT_COMPRESSION;
 746                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 747                         die("bad zlib compression level %d", level);
 748                 core_compression_level = level;
 749                 core_compression_seen = 1;
 750                 if (!zlib_compression_seen)
 751                         zlib_compression_level = level;
 752                 return 0;
 753         }
 754
 755         if (!strcmp(var, "core.packedgitwindowsize")) {
 756                 int pgsz_x2 = getpagesize() * 2;
 757                 packed_git_window_size = git_config_ulong(var, value);
 758
 759                 /* This value must be multiple of (pagesize * 2) */
 760                 packed_git_window_size /= pgsz_x2;
 761                 if (packed_git_window_size < 1)
 762                         packed_git_window_size = 1;
 763                 packed_git_window_size *= pgsz_x2;
 764                 return 0;
 765         }
 766
 767         if (!strcmp(var, "core.bigfilethreshold")) {
 768                 big_file_threshold = git_config_ulong(var, value);
 769                 return 0;
 770         }
 771
 772         if (!strcmp(var, "core.packedgitlimit")) {
 773                 packed_git_limit = git_config_ulong(var, value);
 774                 return 0;
 775         }
 776
 777         if (!strcmp(var, "core.deltabasecachelimit")) {
 778                 delta_base_cache_limit = git_config_ulong(var, value);
 779                 return 0;
 780         }
 781
 782         if (!strcmp(var, "core.autocrlf")) {
 783                 if (value && !strcasecmp(value, "input")) {
 784                         if (core_eol == EOL_CRLF)
 785                                 return error("core.autocrlf=input conflicts with core.eol=crlf");
 786                         auto_crlf = AUTO_CRLF_INPUT;
 787                         return 0;
 788                 }
 789                 auto_crlf = git_config_bool(var, value);
 790                 return 0;
 791         }
 792
 793         if (!strcmp(var, "core.safecrlf")) {
 794                 if (value && !strcasecmp(value, "warn")) {
 795                         safe_crlf = SAFE_CRLF_WARN;
 796                         return 0;
 797                 }
 798                 safe_crlf = git_config_bool(var, value);
 799                 return 0;
 800         }
 801
 802         if (!strcmp(var, "core.eol")) {
 803                 if (value && !strcasecmp(value, "lf"))
 804                         core_eol = EOL_LF;
 805                 else if (value && !strcasecmp(value, "crlf"))
 806                         core_eol = EOL_CRLF;
 807                 else if (value && !strcasecmp(value, "native"))
 808                         core_eol = EOL_NATIVE;
 809                 else
 810                         core_eol = EOL_UNSET;
 811                 if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 812                         return error("core.autocrlf=input conflicts with core.eol=crlf");
 813                 return 0;
 814         }
 815
 816         if (!strcmp(var, "core.notesref")) {
 817                 notes_ref_name = xstrdup(value);
 818                 return 0;
 819         }
 820
 821         if (!strcmp(var, "core.pager"))
 822                 return git_config_string(&pager_program, var, value);
 823
 824         if (!strcmp(var, "core.editor"))
 825                 return git_config_string(&editor_program, var, value);
 826
 827         if (!strcmp(var, "core.commentchar")) {
 828                 if (!value)
 829                         return config_error_nonbool(var);
 830                 else if (!strcasecmp(value, "auto"))
 831                         auto_comment_line_char = 1;
 832                 else if (value[0] && !value[1]) {
 833                         comment_line_char = value[0];
 834                         auto_comment_line_char = 0;
 835                 } else
 836                         return error("core.commentChar should only be one character");
 837                 return 0;
 838         }
 839
 840         if (!strcmp(var, "core.askpass"))
 841                 return git_config_string(&askpass_program, var, value);
 842
 843         if (!strcmp(var, "core.excludesfile"))
 844                 return git_config_pathname(&excludes_file, var, value);
 845
 846         if (!strcmp(var, "core.whitespace")) {
 847                 if (!value)
 848                         return config_error_nonbool(var);
 849                 whitespace_rule_cfg = parse_whitespace_rule(value);
 850                 return 0;
 851         }
 852
 853         if (!strcmp(var, "core.fsyncobjectfiles")) {
 854                 fsync_object_files = git_config_bool(var, value);
 855                 return 0;
 856         }
 857
 858         if (!strcmp(var, "core.preloadindex")) {
 859                 core_preload_index = git_config_bool(var, value);
 860                 return 0;
 861         }
 862
 863         if (!strcmp(var, "core.createobject")) {
 864                 if (!strcmp(value, "rename"))
 865                         object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 866                 else if (!strcmp(value, "link"))
 867                         object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 868                 else
 869                         die("Invalid mode for object creation: %s", value);
 870                 return 0;
 871         }
 872
 873         if (!strcmp(var, "core.sparsecheckout")) {
 874                 core_apply_sparse_checkout = git_config_bool(var, value);
 875                 return 0;
 876         }
 877
 878         if (!strcmp(var, "core.precomposeunicode")) {
 879                 precomposed_unicode = git_config_bool(var, value);
 880                 return 0;
 881         }
 882
 883         /* Add other config variables here and to Documentation/config.txt. */
 884         return 0;
 885 }
 886
 887 static int git_default_i18n_config(const char *var, const char *value)
 888 {
 889         if (!strcmp(var, "i18n.commitencoding"))
 890                 return git_config_string(&git_commit_encoding, var, value);
 891
 892         if (!strcmp(var, "i18n.logoutputencoding"))
 893                 return git_config_string(&git_log_output_encoding, var, value);
 894
 895         /* Add other config variables here and to Documentation/config.txt. */
 896         return 0;
 897 }
 898
 899 static int git_default_branch_config(const char *var, const char *value)
 900 {
 901         if (!strcmp(var, "branch.autosetupmerge")) {
 902                 if (value && !strcasecmp(value, "always")) {
 903                         git_branch_track = BRANCH_TRACK_ALWAYS;
 904                         return 0;
 905                 }
 906                 git_branch_track = git_config_bool(var, value);
 907                 return 0;
 908         }
 909         if (!strcmp(var, "branch.autosetuprebase")) {
 910                 if (!value)
 911                         return config_error_nonbool(var);
 912                 else if (!strcmp(value, "never"))
 913                         autorebase = AUTOREBASE_NEVER;
 914                 else if (!strcmp(value, "local"))
 915                         autorebase = AUTOREBASE_LOCAL;
 916                 else if (!strcmp(value, "remote"))
 917                         autorebase = AUTOREBASE_REMOTE;
 918                 else if (!strcmp(value, "always"))
 919                         autorebase = AUTOREBASE_ALWAYS;
 920                 else
 921                         return error("Malformed value for %s", var);
 922                 return 0;
 923         }
 924
 925         /* Add other config variables here and to Documentation/config.txt. */
 926         return 0;
 927 }
 928
 929 static int git_default_push_config(const char *var, const char *value)
 930 {
 931         if (!strcmp(var, "push.default")) {
 932                 if (!value)
 933                         return config_error_nonbool(var);
 934                 else if (!strcmp(value, "nothing"))
 935                         push_default = PUSH_DEFAULT_NOTHING;
 936                 else if (!strcmp(value, "matching"))
 937                         push_default = PUSH_DEFAULT_MATCHING;
 938                 else if (!strcmp(value, "simple"))
 939                         push_default = PUSH_DEFAULT_SIMPLE;
 940                 else if (!strcmp(value, "upstream"))
 941                         push_default = PUSH_DEFAULT_UPSTREAM;
 942                 else if (!strcmp(value, "tracking")) /* deprecated */
 943                         push_default = PUSH_DEFAULT_UPSTREAM;
 944                 else if (!strcmp(value, "current"))
 945                         push_default = PUSH_DEFAULT_CURRENT;
 946                 else {
 947                         error("Malformed value for %s: %s", var, value);
 948                         return error("Must be one of nothing, matching, simple, "
 949                                      "upstream or current.");
 950                 }
 951                 return 0;
 952         }
 953
 954         /* Add other config variables here and to Documentation/config.txt. */
 955         return 0;
 956 }
 957
 958 static int git_default_mailmap_config(const char *var, const char *value)
 959 {
 960         if (!strcmp(var, "mailmap.file"))
 961                 return git_config_pathname(&git_mailmap_file, var, value);
 962         if (!strcmp(var, "mailmap.blob"))
 963                 return git_config_string(&git_mailmap_blob, var, value);
 964
 965         /* Add other config variables here and to Documentation/config.txt. */
 966         return 0;
 967 }
 968
 969 int git_default_config(const char *var, const char *value, void *dummy)
 970 {
 971         if (starts_with(var, "core."))
 972                 return git_default_core_config(var, value);
 973
 974         if (starts_with(var, "user."))
 975                 return git_ident_config(var, value, dummy);
 976
 977         if (starts_with(var, "i18n."))
 978                 return git_default_i18n_config(var, value);
 979
 980         if (starts_with(var, "branch."))
 981                 return git_default_branch_config(var, value);
 982
 983         if (starts_with(var, "push."))
 984                 return git_default_push_config(var, value);
 985
 986         if (starts_with(var, "mailmap."))
 987                 return git_default_mailmap_config(var, value);
 988
 989         if (starts_with(var, "advice."))
 990                 return git_default_advice_config(var, value);
 991
 992         if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 993                 pager_use_color = git_config_bool(var,value);
 994                 return 0;
 995         }
 996
 997         if (!strcmp(var, "pack.packsizelimit")) {
 998                 pack_size_limit_cfg = git_config_ulong(var, value);
 999                 return 0;
1000         }
1001         /* Add other config variables here and to Documentation/config.txt. */
1002         return 0;
1003 }
1004
1005 /*
1006  * All source specific fields in the union, die_on_error, name and the callbacks
1007  * fgetc, ungetc, ftell of top need to be initialized before calling
1008  * this function.
1009  */
1010 static int do_config_from(struct config_source *top, config_fn_t fn, void *data)
1011 {
1012         int ret;
1013
1014         /* push config-file parsing state stack */
1015         top->prev = cf;
1016         top->linenr = 1;
1017         top->eof = 0;
1018         strbuf_init(&top->value, 1024);
1019         strbuf_init(&top->var, 1024);
1020         cf = top;
1021
1022         ret = git_parse_source(fn, data);
1023
1024         /* pop config-file parsing state stack */
1025         strbuf_release(&top->value);
1026         strbuf_release(&top->var);
1027         cf = top->prev;
1028
1029         return ret;
1030 }
1031
1032 static int do_config_from_file(config_fn_t fn,
1033                 const char *name, const char *path, FILE *f, void *data)
1034 {
1035         struct config_source top;
1036
1037         top.u.file = f;
1038         top.name = name;
1039         top.path = path;
1040         top.die_on_error = 1;
1041         top.do_fgetc = config_file_fgetc;
1042         top.do_ungetc = config_file_ungetc;
1043         top.do_ftell = config_file_ftell;
1044
1045         return do_config_from(&top, fn, data);
1046 }
1047
1048 static int git_config_from_stdin(config_fn_t fn, void *data)
1049 {
1050         return do_config_from_file(fn, "<stdin>", NULL, stdin, data);
1051 }
1052
1053 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
1054 {
1055         int ret = -1;
1056         FILE *f;
1057
1058         f = fopen(filename, "r");
1059         if (f) {
1060                 ret = do_config_from_file(fn, filename, filename, f, data);
1061                 fclose(f);
1062         }
1063         return ret;
1064 }
1065
1066 int git_config_from_buf(config_fn_t fn, const char *name, const char *buf,
1067                         size_t len, void *data)
1068 {
1069         struct config_source top;
1070
1071         top.u.buf.buf = buf;
1072         top.u.buf.len = len;
1073         top.u.buf.pos = 0;
1074         top.name = name;
1075         top.path = NULL;
1076         top.die_on_error = 0;
1077         top.do_fgetc = config_buf_fgetc;
1078         top.do_ungetc = config_buf_ungetc;
1079         top.do_ftell = config_buf_ftell;
1080
1081         return do_config_from(&top, fn, data);
1082 }
1083
1084 static int git_config_from_blob_sha1(config_fn_t fn,
1085                                      const char *name,
1086                                      const unsigned char *sha1,
1087                                      void *data)
1088 {
1089         enum object_type type;
1090         char *buf;
1091         unsigned long size;
1092         int ret;
1093
1094         buf = read_sha1_file(sha1, &type, &size);
1095         if (!buf)
1096                 return error("unable to load config blob object '%s'", name);
1097         if (type != OBJ_BLOB) {
1098                 free(buf);
1099                 return error("reference '%s' does not point to a blob", name);
1100         }
1101
1102         ret = git_config_from_buf(fn, name, buf, size, data);
1103         free(buf);
1104
1105         return ret;
1106 }
1107
1108 static int git_config_from_blob_ref(config_fn_t fn,
1109                                     const char *name,
1110                                     void *data)
1111 {
1112         unsigned char sha1[20];
1113
1114         if (get_sha1(name, sha1) < 0)
1115                 return error("unable to resolve config blob '%s'", name);
1116         return git_config_from_blob_sha1(fn, name, sha1, data);
1117 }
1118
1119 const char *git_etc_gitconfig(void)
1120 {
1121         static const char *system_wide;
1122         if (!system_wide)
1123                 system_wide = system_path(ETC_GITCONFIG);
1124         return system_wide;
1125 }
1126
1127 int git_env_bool(const char *k, int def)
1128 {
1129         const char *v = getenv(k);
1130         return v ? git_config_bool(k, v) : def;
1131 }
1132
1133 int git_config_system(void)
1134 {
1135         return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
1136 }
1137
1138 int git_config_early(config_fn_t fn, void *data, const char *repo_config)
1139 {
1140         int ret = 0, found = 0;
1141         char *xdg_config = NULL;
1142         char *user_config = NULL;
1143
1144         home_config_paths(&user_config, &xdg_config, "config");
1145
1146         if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0)) {
1147                 ret += git_config_from_file(fn, git_etc_gitconfig(),
1148                                             data);
1149                 found += 1;
1150         }
1151
1152         if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK)) {
1153                 ret += git_config_from_file(fn, xdg_config, data);
1154                 found += 1;
1155         }
1156
1157         if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK)) {
1158                 ret += git_config_from_file(fn, user_config, data);
1159                 found += 1;
1160         }
1161
1162         if (repo_config && !access_or_die(repo_config, R_OK, 0)) {
1163                 ret += git_config_from_file(fn, repo_config, data);
1164                 found += 1;
1165         }
1166
1167         switch (git_config_from_parameters(fn, data)) {
1168         case -1: /* error */
1169                 die("unable to parse command-line config");
1170                 break;
1171         case 0: /* found nothing */
1172                 break;
1173         default: /* found at least one item */
1174                 found++;
1175                 break;
1176         }
1177
1178         free(xdg_config);
1179         free(user_config);
1180         return ret == 0 ? found : ret;
1181 }
1182
1183 int git_config_with_options(config_fn_t fn, void *data,
1184                             struct git_config_source *config_source,
1185                             int respect_includes)
1186 {
1187         char *repo_config = NULL;
1188         int ret;
1189         struct config_include_data inc = CONFIG_INCLUDE_INIT;
1190
1191         if (respect_includes) {
1192                 inc.fn = fn;
1193                 inc.data = data;
1194                 fn = git_config_include;
1195                 data = &inc;
1196         }
1197
1198         /*
1199          * If we have a specific filename, use it. Otherwise, follow the
1200          * regular lookup sequence.
1201          */
1202         if (config_source && config_source->use_stdin)
1203                 return git_config_from_stdin(fn, data);
1204         else if (config_source && config_source->file)
1205                 return git_config_from_file(fn, config_source->file, data);
1206         else if (config_source && config_source->blob)
1207                 return git_config_from_blob_ref(fn, config_source->blob, data);
1208
1209         repo_config = git_pathdup("config");
1210         ret = git_config_early(fn, data, repo_config);
1211         if (repo_config)
1212                 free(repo_config);
1213         return ret;
1214 }
1215
1216 int git_config(config_fn_t fn, void *data)
1217 {
1218         return git_config_with_options(fn, data, NULL, 1);
1219 }
1220
1221 /*
1222  * Find all the stuff for git_config_set() below.
1223  */
1224
1225 static struct {
1226         int baselen;
1227         char *key;
1228         int do_not_match;
1229         regex_t *value_regex;
1230         int multi_replace;
1231         size_t *offset;
1232         unsigned int offset_alloc;
1233         enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1234         int seen;
1235 } store;
1236
1237 static int matches(const char *key, const char *value)
1238 {
1239         return !strcmp(key, store.key) &&
1240                 (store.value_regex == NULL ||
1241                  (store.do_not_match ^
1242                   !regexec(store.value_regex, value, 0, NULL, 0)));
1243 }
1244
1245 static int store_aux(const char *key, const char *value, void *cb)
1246 {
1247         const char *ep;
1248         size_t section_len;
1249
1250         switch (store.state) {
1251         case KEY_SEEN:
1252                 if (matches(key, value)) {
1253                         if (store.seen == 1 && store.multi_replace == 0) {
1254                                 warning("%s has multiple values", key);
1255                         }
1256
1257                         ALLOC_GROW(store.offset, store.seen + 1,
1258                                    store.offset_alloc);
1259
1260                         store.offset[store.seen] = cf->do_ftell(cf);
1261                         store.seen++;
1262                 }
1263                 break;
1264         case SECTION_SEEN:
1265                 /*
1266                  * What we are looking for is in store.key (both
1267                  * section and var), and its section part is baselen
1268                  * long.  We found key (again, both section and var).
1269                  * We would want to know if this key is in the same
1270                  * section as what we are looking for.  We already
1271                  * know we are in the same section as what should
1272                  * hold store.key.
1273                  */
1274                 ep = strrchr(key, '.');
1275                 section_len = ep - key;
1276
1277                 if ((section_len != store.baselen) ||
1278                     memcmp(key, store.key, section_len+1)) {
1279                         store.state = SECTION_END_SEEN;
1280                         break;
1281                 }
1282
1283                 /*
1284                  * Do not increment matches: this is no match, but we
1285                  * just made sure we are in the desired section.
1286                  */
1287                 ALLOC_GROW(store.offset, store.seen + 1,
1288                            store.offset_alloc);
1289                 store.offset[store.seen] = cf->do_ftell(cf);
1290                 /* fallthru */
1291         case SECTION_END_SEEN:
1292         case START:
1293                 if (matches(key, value)) {
1294                         ALLOC_GROW(store.offset, store.seen + 1,
1295                                    store.offset_alloc);
1296                         store.offset[store.seen] = cf->do_ftell(cf);
1297                         store.state = KEY_SEEN;
1298                         store.seen++;
1299                 } else {
1300                         if (strrchr(key, '.') - key == store.baselen &&
1301                               !strncmp(key, store.key, store.baselen)) {
1302                                         store.state = SECTION_SEEN;
1303                                         ALLOC_GROW(store.offset,
1304                                                    store.seen + 1,
1305                                                    store.offset_alloc);
1306                                         store.offset[store.seen] = cf->do_ftell(cf);
1307                         }
1308                 }
1309         }
1310         return 0;
1311 }
1312
1313 static int write_error(const char *filename)
1314 {
1315         error("failed to write new configuration file %s", filename);
1316
1317         /* Same error code as "failed to rename". */
1318         return 4;
1319 }
1320
1321 static int store_write_section(int fd, const char *key)
1322 {
1323         const char *dot;
1324         int i, success;
1325         struct strbuf sb = STRBUF_INIT;
1326
1327         dot = memchr(key, '.', store.baselen);
1328         if (dot) {
1329                 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1330                 for (i = dot - key + 1; i < store.baselen; i++) {
1331                         if (key[i] == '"' || key[i] == '\\')
1332                                 strbuf_addch(&sb, '\\');
1333                         strbuf_addch(&sb, key[i]);
1334                 }
1335                 strbuf_addstr(&sb, "\"]\n");
1336         } else {
1337                 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1338         }
1339
1340         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1341         strbuf_release(&sb);
1342
1343         return success;
1344 }
1345
1346 static int store_write_pair(int fd, const char *key, const char *value)
1347 {
1348         int i, success;
1349         int length = strlen(key + store.baselen + 1);
1350         const char *quote = "";
1351         struct strbuf sb = STRBUF_INIT;
1352
1353         /*
1354          * Check to see if the value needs to be surrounded with a dq pair.
1355          * Note that problematic characters are always backslash-quoted; this
1356          * check is about not losing leading or trailing SP and strings that
1357          * follow beginning-of-comment characters (i.e. ';' and '#') by the
1358          * configuration parser.
1359          */
1360         if (value[0] == ' ')
1361                 quote = "\"";
1362         for (i = 0; value[i]; i++)
1363                 if (value[i] == ';' || value[i] == '#')
1364                         quote = "\"";
1365         if (i && value[i - 1] == ' ')
1366                 quote = "\"";
1367
1368         strbuf_addf(&sb, "\t%.*s = %s",
1369                     length, key + store.baselen + 1, quote);
1370
1371         for (i = 0; value[i]; i++)
1372                 switch (value[i]) {
1373                 case '\n':
1374                         strbuf_addstr(&sb, "\\n");
1375                         break;
1376                 case '\t':
1377                         strbuf_addstr(&sb, "\\t");
1378                         break;
1379                 case '"':
1380                 case '\\':
1381                         strbuf_addch(&sb, '\\');
1382                 default:
1383                         strbuf_addch(&sb, value[i]);
1384                         break;
1385                 }
1386         strbuf_addf(&sb, "%s\n", quote);
1387
1388         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1389         strbuf_release(&sb);
1390
1391         return success;
1392 }
1393
1394 static ssize_t find_beginning_of_line(const char *contents, size_t size,
1395         size_t offset_, int *found_bracket)
1396 {
1397         size_t equal_offset = size, bracket_offset = size;
1398         ssize_t offset;
1399
1400 contline:
1401         for (offset = offset_-2; offset > 0
1402                         && contents[offset] != '\n'; offset--)
1403                 switch (contents[offset]) {
1404                         case '=': equal_offset = offset; break;
1405                         case ']': bracket_offset = offset; break;
1406                 }
1407         if (offset > 0 && contents[offset-1] == '\\') {
1408                 offset_ = offset;
1409                 goto contline;
1410         }
1411         if (bracket_offset < equal_offset) {
1412                 *found_bracket = 1;
1413                 offset = bracket_offset+1;
1414         } else
1415                 offset++;
1416
1417         return offset;
1418 }
1419
1420 int git_config_set_in_file(const char *config_filename,
1421                         const char *key, const char *value)
1422 {
1423         return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1424 }
1425
1426 int git_config_set(const char *key, const char *value)
1427 {
1428         return git_config_set_multivar(key, value, NULL, 0);
1429 }
1430
1431 /*
1432  * Auxiliary function to sanity-check and split the key into the section
1433  * identifier and variable name.
1434  *
1435  * Returns 0 on success, -1 when there is an invalid character in the key and
1436  * -2 if there is no section name in the key.
1437  *
1438  * store_key - pointer to char* which will hold a copy of the key with
1439  *             lowercase section and variable name
1440  * baselen - pointer to int which will hold the length of the
1441  *           section + subsection part, can be NULL
1442  */
1443 int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1444 {
1445         int i, dot, baselen;
1446         const char *last_dot = strrchr(key, '.');
1447
1448         /*
1449          * Since "key" actually contains the section name and the real
1450          * key name separated by a dot, we have to know where the dot is.
1451          */
1452
1453         if (last_dot == NULL || last_dot == key) {
1454                 error("key does not contain a section: %s", key);
1455                 return -CONFIG_NO_SECTION_OR_NAME;
1456         }
1457
1458         if (!last_dot[1]) {
1459                 error("key does not contain variable name: %s", key);
1460                 return -CONFIG_NO_SECTION_OR_NAME;
1461         }
1462
1463         baselen = last_dot - key;
1464         if (baselen_)
1465                 *baselen_ = baselen;
1466
1467         /*
1468          * Validate the key and while at it, lower case it for matching.
1469          */
1470         *store_key = xmalloc(strlen(key) + 1);
1471
1472         dot = 0;
1473         for (i = 0; key[i]; i++) {
1474                 unsigned char c = key[i];
1475                 if (c == '.')
1476                         dot = 1;
1477                 /* Leave the extended basename untouched.. */
1478                 if (!dot || i > baselen) {
1479                         if (!iskeychar(c) ||
1480                             (i == baselen + 1 && !isalpha(c))) {
1481                                 error("invalid key: %s", key);
1482                                 goto out_free_ret_1;
1483                         }
1484                         c = tolower(c);
1485                 } else if (c == '\n') {
1486                         error("invalid key (newline): %s", key);
1487                         goto out_free_ret_1;
1488                 }
1489                 (*store_key)[i] = c;
1490         }
1491         (*store_key)[i] = 0;
1492
1493         return 0;
1494
1495 out_free_ret_1:
1496         free(*store_key);
1497         *store_key = NULL;
1498         return -CONFIG_INVALID_KEY;
1499 }
1500
1501 /*
1502  * If value==NULL, unset in (remove from) config,
1503  * if value_regex!=NULL, disregard key/value pairs where value does not match.
1504  * if multi_replace==0, nothing, or only one matching key/value is replaced,
1505  *     else all matching key/values (regardless how many) are removed,
1506  *     before the new pair is written.
1507  *
1508  * Returns 0 on success.
1509  *
1510  * This function does this:
1511  *
1512  * - it locks the config file by creating ".git/config.lock"
1513  *
1514  * - it then parses the config using store_aux() as validator to find
1515  *   the position on the key/value pair to replace. If it is to be unset,
1516  *   it must be found exactly once.
1517  *
1518  * - the config file is mmap()ed and the part before the match (if any) is
1519  *   written to the lock file, then the changed part and the rest.
1520  *
1521  * - the config file is removed and the lock file rename()d to it.
1522  *
1523  */
1524 int git_config_set_multivar_in_file(const char *config_filename,
1525                                 const char *key, const char *value,
1526                                 const char *value_regex, int multi_replace)
1527 {
1528         int fd = -1, in_fd;
1529         int ret;
1530         struct lock_file *lock = NULL;
1531         char *filename_buf = NULL;
1532
1533         /* parse-key returns negative; flip the sign to feed exit(3) */
1534         ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1535         if (ret)
1536                 goto out_free;
1537
1538         store.multi_replace = multi_replace;
1539
1540         if (!config_filename)
1541                 config_filename = filename_buf = git_pathdup("config");
1542
1543         /*
1544          * The lock serves a purpose in addition to locking: the new
1545          * contents of .git/config will be written into it.
1546          */
1547         lock = xcalloc(1, sizeof(struct lock_file));
1548         fd = hold_lock_file_for_update(lock, config_filename, 0);
1549         if (fd < 0) {
1550                 error("could not lock config file %s: %s", config_filename, strerror(errno));
1551                 free(store.key);
1552                 ret = CONFIG_NO_LOCK;
1553                 goto out_free;
1554         }
1555
1556         /*
1557          * If .git/config does not exist yet, write a minimal version.
1558          */
1559         in_fd = open(config_filename, O_RDONLY);
1560         if ( in_fd < 0 ) {
1561                 free(store.key);
1562
1563                 if ( ENOENT != errno ) {
1564                         error("opening %s: %s", config_filename,
1565                               strerror(errno));
1566                         ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1567                         goto out_free;
1568                 }
1569                 /* if nothing to unset, error out */
1570                 if (value == NULL) {
1571                         ret = CONFIG_NOTHING_SET;
1572                         goto out_free;
1573                 }
1574
1575                 store.key = (char *)key;
1576                 if (!store_write_section(fd, key) ||
1577                     !store_write_pair(fd, key, value))
1578                         goto write_err_out;
1579         } else {
1580                 struct stat st;
1581                 char *contents;
1582                 size_t contents_sz, copy_begin, copy_end;
1583                 int i, new_line = 0;
1584
1585                 if (value_regex == NULL)
1586                         store.value_regex = NULL;
1587                 else {
1588                         if (value_regex[0] == '!') {
1589                                 store.do_not_match = 1;
1590                                 value_regex++;
1591                         } else
1592                                 store.do_not_match = 0;
1593
1594                         store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1595                         if (regcomp(store.value_regex, value_regex,
1596                                         REG_EXTENDED)) {
1597                                 error("invalid pattern: %s", value_regex);
1598                                 free(store.value_regex);
1599                                 ret = CONFIG_INVALID_PATTERN;
1600                                 goto out_free;
1601                         }
1602                 }
1603
1604                 ALLOC_GROW(store.offset, 1, store.offset_alloc);
1605                 store.offset[0] = 0;
1606                 store.state = START;
1607                 store.seen = 0;
1608
1609                 /*
1610                  * After this, store.offset will contain the *end* offset
1611                  * of the last match, or remain at 0 if no match was found.
1612                  * As a side effect, we make sure to transform only a valid
1613                  * existing config file.
1614                  */
1615                 if (git_config_from_file(store_aux, config_filename, NULL)) {
1616                         error("invalid config file %s", config_filename);
1617                         free(store.key);
1618                         if (store.value_regex != NULL) {
1619                                 regfree(store.value_regex);
1620                                 free(store.value_regex);
1621                         }
1622                         ret = CONFIG_INVALID_FILE;
1623                         goto out_free;
1624                 }
1625
1626                 free(store.key);
1627                 if (store.value_regex != NULL) {
1628                         regfree(store.value_regex);
1629                         free(store.value_regex);
1630                 }
1631
1632                 /* if nothing to unset, or too many matches, error out */
1633                 if ((store.seen == 0 && value == NULL) ||
1634                                 (store.seen > 1 && multi_replace == 0)) {
1635                         ret = CONFIG_NOTHING_SET;
1636                         goto out_free;
1637                 }
1638
1639                 fstat(in_fd, &st);
1640                 contents_sz = xsize_t(st.st_size);
1641                 contents = xmmap(NULL, contents_sz, PROT_READ,
1642                         MAP_PRIVATE, in_fd, 0);
1643                 close(in_fd);
1644
1645                 if (chmod(lock->filename, st.st_mode & 07777) < 0) {
1646                         error("chmod on %s failed: %s",
1647                                 lock->filename, strerror(errno));
1648                         ret = CONFIG_NO_WRITE;
1649                         goto out_free;
1650                 }
1651
1652                 if (store.seen == 0)
1653                         store.seen = 1;
1654
1655                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1656                         if (store.offset[i] == 0) {
1657                                 store.offset[i] = copy_end = contents_sz;
1658                         } else if (store.state != KEY_SEEN) {
1659                                 copy_end = store.offset[i];
1660                         } else
1661                                 copy_end = find_beginning_of_line(
1662                                         contents, contents_sz,
1663                                         store.offset[i]-2, &new_line);
1664
1665                         if (copy_end > 0 && contents[copy_end-1] != '\n')
1666                                 new_line = 1;
1667
1668                         /* write the first part of the config */
1669                         if (copy_end > copy_begin) {
1670                                 if (write_in_full(fd, contents + copy_begin,
1671                                                   copy_end - copy_begin) <
1672                                     copy_end - copy_begin)
1673                                         goto write_err_out;
1674                                 if (new_line &&
1675                                     write_str_in_full(fd, "\n") != 1)
1676                                         goto write_err_out;
1677                         }
1678                         copy_begin = store.offset[i];
1679                 }
1680
1681                 /* write the pair (value == NULL means unset) */
1682                 if (value != NULL) {
1683                         if (store.state == START) {
1684                                 if (!store_write_section(fd, key))
1685                                         goto write_err_out;
1686                         }
1687                         if (!store_write_pair(fd, key, value))
1688                                 goto write_err_out;
1689                 }
1690
1691                 /* write the rest of the config */
1692                 if (copy_begin < contents_sz)
1693                         if (write_in_full(fd, contents + copy_begin,
1694                                           contents_sz - copy_begin) <
1695                             contents_sz - copy_begin)
1696                                 goto write_err_out;
1697
1698                 munmap(contents, contents_sz);
1699         }
1700
1701         if (commit_lock_file(lock) < 0) {
1702                 error("could not commit config file %s", config_filename);
1703                 ret = CONFIG_NO_WRITE;
1704                 goto out_free;
1705         }
1706
1707         /*
1708          * lock is committed, so don't try to roll it back below.
1709          * NOTE: Since lockfile.c keeps a linked list of all created
1710          * lock_file structures, it isn't safe to free(lock).  It's
1711          * better to just leave it hanging around.
1712          */
1713         lock = NULL;
1714         ret = 0;
1715
1716 out_free:
1717         if (lock)
1718                 rollback_lock_file(lock);
1719         free(filename_buf);
1720         return ret;
1721
1722 write_err_out:
1723         ret = write_error(lock->filename);
1724         goto out_free;
1725
1726 }
1727
1728 int git_config_set_multivar(const char *key, const char *value,
1729                         const char *value_regex, int multi_replace)
1730 {
1731         return git_config_set_multivar_in_file(NULL, key, value, value_regex,
1732                                                multi_replace);
1733 }
1734
1735 static int section_name_match (const char *buf, const char *name)
1736 {
1737         int i = 0, j = 0, dot = 0;
1738         if (buf[i] != '[')
1739                 return 0;
1740         for (i = 1; buf[i] && buf[i] != ']'; i++) {
1741                 if (!dot && isspace(buf[i])) {
1742                         dot = 1;
1743                         if (name[j++] != '.')
1744                                 break;
1745                         for (i++; isspace(buf[i]); i++)
1746                                 ; /* do nothing */
1747                         if (buf[i] != '"')
1748                                 break;
1749                         continue;
1750                 }
1751                 if (buf[i] == '\\' && dot)
1752                         i++;
1753                 else if (buf[i] == '"' && dot) {
1754                         for (i++; isspace(buf[i]); i++)
1755                                 ; /* do_nothing */
1756                         break;
1757                 }
1758                 if (buf[i] != name[j++])
1759                         break;
1760         }
1761         if (buf[i] == ']' && name[j] == 0) {
1762                 /*
1763                  * We match, now just find the right length offset by
1764                  * gobbling up any whitespace after it, as well
1765                  */
1766                 i++;
1767                 for (; buf[i] && isspace(buf[i]); i++)
1768                         ; /* do nothing */
1769                 return i;
1770         }
1771         return 0;
1772 }
1773
1774 static int section_name_is_ok(const char *name)
1775 {
1776         /* Empty section names are bogus. */
1777         if (!*name)
1778                 return 0;
1779
1780         /*
1781          * Before a dot, we must be alphanumeric or dash. After the first dot,
1782          * anything goes, so we can stop checking.
1783          */
1784         for (; *name && *name != '.'; name++)
1785                 if (*name != '-' && !isalnum(*name))
1786                         return 0;
1787         return 1;
1788 }
1789
1790 /* if new_name == NULL, the section is removed instead */
1791 int git_config_rename_section_in_file(const char *config_filename,
1792                                       const char *old_name, const char *new_name)
1793 {
1794         int ret = 0, remove = 0;
1795         char *filename_buf = NULL;
1796         struct lock_file *lock;
1797         int out_fd;
1798         char buf[1024];
1799         FILE *config_file;
1800         struct stat st;
1801
1802         if (new_name && !section_name_is_ok(new_name)) {
1803                 ret = error("invalid section name: %s", new_name);
1804                 goto out;
1805         }
1806
1807         if (!config_filename)
1808                 config_filename = filename_buf = git_pathdup("config");
1809
1810         lock = xcalloc(1, sizeof(struct lock_file));
1811         out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1812         if (out_fd < 0) {
1813                 ret = error("could not lock config file %s", config_filename);
1814                 goto out;
1815         }
1816
1817         if (!(config_file = fopen(config_filename, "rb"))) {
1818                 /* no config file means nothing to rename, no error */
1819                 goto unlock_and_out;
1820         }
1821
1822         fstat(fileno(config_file), &st);
1823
1824         if (chmod(lock->filename, st.st_mode & 07777) < 0) {
1825                 ret = error("chmod on %s failed: %s",
1826                                 lock->filename, strerror(errno));
1827                 goto out;
1828         }
1829
1830         while (fgets(buf, sizeof(buf), config_file)) {
1831                 int i;
1832                 int length;
1833                 char *output = buf;
1834                 for (i = 0; buf[i] && isspace(buf[i]); i++)
1835                         ; /* do nothing */
1836                 if (buf[i] == '[') {
1837                         /* it's a section */
1838                         int offset = section_name_match(&buf[i], old_name);
1839                         if (offset > 0) {
1840                                 ret++;
1841                                 if (new_name == NULL) {
1842                                         remove = 1;
1843                                         continue;
1844                                 }
1845                                 store.baselen = strlen(new_name);
1846                                 if (!store_write_section(out_fd, new_name)) {
1847                                         ret = write_error(lock->filename);
1848                                         goto out;
1849                                 }
1850                                 /*
1851                                  * We wrote out the new section, with
1852                                  * a newline, now skip the old
1853                                  * section's length
1854                                  */
1855                                 output += offset + i;
1856                                 if (strlen(output) > 0) {
1857                                         /*
1858                                          * More content means there's
1859                                          * a declaration to put on the
1860                                          * next line; indent with a
1861                                          * tab
1862                                          */
1863                                         output -= 1;
1864                                         output[0] = '\t';
1865                                 }
1866                         }
1867                         remove = 0;
1868                 }
1869                 if (remove)
1870                         continue;
1871                 length = strlen(output);
1872                 if (write_in_full(out_fd, output, length) != length) {
1873                         ret = write_error(lock->filename);
1874                         goto out;
1875                 }
1876         }
1877         fclose(config_file);
1878 unlock_and_out:
1879         if (commit_lock_file(lock) < 0)
1880                 ret = error("could not commit config file %s", config_filename);
1881 out:
1882         free(filename_buf);
1883         return ret;
1884 }
1885
1886 int git_config_rename_section(const char *old_name, const char *new_name)
1887 {
1888         return git_config_rename_section_in_file(NULL, old_name, new_name);
1889 }
1890
1891 /*
1892  * Call this to report error for your variable that should not
1893  * get a boolean value (i.e. "[my] var" means "true").
1894  */
1895 #undef config_error_nonbool
1896 int config_error_nonbool(const char *var)
1897 {
1898         return error("Missing value for '%s'", var);
1899 }
1900
1901 int parse_config_key(const char *var,
1902                      const char *section,
1903                      const char **subsection, int *subsection_len,
1904                      const char **key)
1905 {
1906         int section_len = strlen(section);
1907         const char *dot;
1908
1909         /* Does it start with "section." ? */
1910         if (!starts_with(var, section) || var[section_len] != '.')
1911                 return -1;
1912
1913         /*
1914          * Find the key; we don't know yet if we have a subsection, but we must
1915          * parse backwards from the end, since the subsection may have dots in
1916          * it, too.
1917          */
1918         dot = strrchr(var, '.');
1919         *key = dot + 1;
1920
1921         /* Did we have a subsection at all? */
1922         if (dot == var + section_len) {
1923                 *subsection = NULL;
1924                 *subsection_len = 0;
1925         }
1926         else {
1927                 *subsection = var + section_len + 1;
1928                 *subsection_len = dot - *subsection;
1929         }
1930
1931         return 0;
1932 }