config.c

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