config.c

   1 /*
   2  * GIT - The information manager from hell
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  * Copyright (C) Johannes Schindelin, 2005
   6  *
   7  */
   8 #include "cache.h"
   9 #include "exec_cmd.h"
  10 #include "strbuf.h"
  11 #include "quote.h"
  12
  13 struct config_source {
  14         struct config_source *prev;
  15         union {
  16                 FILE *file;
  17                 struct config_buf {
  18                         const char *buf;
  19                         size_t len;
  20                         size_t pos;
  21                 } buf;
  22         } u;
  23         const char *name;
  24         int die_on_error;
  25         int linenr;
  26         int eof;
  27         struct strbuf value;
  28         struct strbuf var;
  29
  30         int (*do_fgetc)(struct config_source *c);
  31         int (*do_ungetc)(int c, struct config_source *conf);
  32         long (*do_ftell)(struct config_source *c);
  33 };
  34
  35 static struct config_source *cf;
  36
  37 static int zlib_compression_seen;
  38
  39 static int config_file_fgetc(struct config_source *conf)
  40 {
  41         return fgetc(conf->u.file);
  42 }
  43
  44 static int config_file_ungetc(int c, struct config_source *conf)
  45 {
  46         return ungetc(c, conf->u.file);
  47 }
  48
  49 static long config_file_ftell(struct config_source *conf)
  50 {
  51         return ftell(conf->u.file);
  52 }
  53
  54
  55 static int config_buf_fgetc(struct config_source *conf)
  56 {
  57         if (conf->u.buf.pos < conf->u.buf.len)
  58                 return conf->u.buf.buf[conf->u.buf.pos++];
  59
  60         return EOF;
  61 }
  62
  63 static int config_buf_ungetc(int c, struct config_source *conf)
  64 {
  65         if (conf->u.buf.pos > 0)
  66                 return conf->u.buf.buf[--conf->u.buf.pos];
  67
  68         return EOF;
  69 }
  70
  71 static long config_buf_ftell(struct config_source *conf)
  72 {
  73         return conf->u.buf.pos;
  74 }
  75
  76 #define MAX_INCLUDE_DEPTH 10
  77 static const char include_depth_advice[] =
  78 "exceeded maximum include depth (%d) while including\n"
  79 "       %s\n"
  80 "from\n"
  81 "       %s\n"
  82 "Do you have circular includes?";
  83 static int handle_path_include(const char *path, struct config_include_data *inc)
  84 {
  85         int ret = 0;
  86         struct strbuf buf = STRBUF_INIT;
  87         char *expanded;
  88
  89         if (!path)
  90                 return config_error_nonbool("include.path");
  91
  92         expanded = expand_user_path(path);
  93         if (!expanded)
  94                 return error("Could not expand include path '%s'", path);
  95         path = expanded;
  96
  97         /*
  98          * Use an absolute path as-is, but interpret relative paths
  99          * based on the including config file.
 100          */
 101         if (!is_absolute_path(path)) {
 102                 char *slash;
 103
 104                 if (!cf || !cf->name)
 105                         return error("relative config includes must come from files");
 106
 107                 slash = find_last_dir_sep(cf->name);
 108                 if (slash)
 109                         strbuf_add(&buf, cf->name, slash - cf->name + 1);
 110                 strbuf_addstr(&buf, path);
 111                 path = buf.buf;
 112         }
 113
 114         if (!access_or_die(path, R_OK, 0)) {
 115                 if (++inc->depth > MAX_INCLUDE_DEPTH)
 116                         die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
 117                             cf && cf->name ? cf->name : "the command line");
 118                 ret = git_config_from_file(git_config_include, path, inc);
 119                 inc->depth--;
 120         }
 121         strbuf_release(&buf);
 122         free(expanded);
 123         return ret;
 124 }
 125
 126 int git_config_include(const char *var, const char *value, void *data)
 127 {
 128         struct config_include_data *inc = data;
 129         const char *type;
 130         int ret;
 131
 132         /*
 133          * Pass along all values, including "include" directives; this makes it
 134          * possible to query information on the includes themselves.
 135          */
 136         ret = inc->fn(var, value, inc->data);
 137         if (ret < 0)
 138                 return ret;
 139
 140         type = skip_prefix(var, "include.");
 141         if (!type)
 142                 return ret;
 143
 144         if (!strcmp(type, "path"))
 145                 ret = handle_path_include(value, inc);
 146         return ret;
 147 }
 148
 149 static void lowercase(char *p)
 150 {
 151         for (; *p; p++)
 152                 *p = tolower(*p);
 153 }
 154
 155 void git_config_push_parameter(const char *text)
 156 {
 157         struct strbuf env = STRBUF_INIT;
 158         const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
 159         if (old) {
 160                 strbuf_addstr(&env, old);
 161                 strbuf_addch(&env, ' ');
 162         }
 163         sq_quote_buf(&env, text);
 164         setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
 165         strbuf_release(&env);
 166 }
 167
 168 int git_config_parse_parameter(const char *text,
 169                                config_fn_t fn, void *data)
 170 {
 171         struct strbuf **pair;
 172         pair = strbuf_split_str(text, '=', 2);
 173         if (!pair[0])
 174                 return error("bogus config parameter: %s", text);
 175         if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
 176                 strbuf_setlen(pair[0], pair[0]->len - 1);
 177         strbuf_trim(pair[0]);
 178         if (!pair[0]->len) {
 179                 strbuf_list_free(pair);
 180                 return error("bogus config parameter: %s", text);
 181         }
 182         lowercase(pair[0]->buf);
 183         if (fn(pair[0]->buf, pair[1] ? pair[1]->buf : NULL, data) < 0) {
 184                 strbuf_list_free(pair);
 185                 return -1;
 186         }
 187         strbuf_list_free(pair);
 188         return 0;
 189 }
 190
 191 int git_config_from_parameters(config_fn_t fn, void *data)
 192 {
 193         const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 194         char *envw;
 195         const char **argv = NULL;
 196         int nr = 0, alloc = 0;
 197         int i;
 198
 199         if (!env)
 200                 return 0;
 201         /* sq_dequote will write over it */
 202         envw = xstrdup(env);
 203
 204         if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 205                 free(envw);
 206                 return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
 207         }
 208
 209         for (i = 0; i < nr; i++) {
 210                 if (git_config_parse_parameter(argv[i], fn, data) < 0) {
 211                         free(argv);
 212                         free(envw);
 213                         return -1;
 214                 }
 215         }
 216
 217         free(argv);
 218         free(envw);
 219         return nr > 0;
 220 }
 221
 222 static int get_next_char(void)
 223 {
 224         int c = cf->do_fgetc(cf);
 225
 226         if (c == '\r') {
 227                 /* DOS like systems */
 228                 c = cf->do_fgetc(cf);
 229                 if (c != '\n') {
 230                         cf->do_ungetc(c, cf);
 231                         c = '\r';
 232                 }
 233         }
 234         if (c == '\n')
 235                 cf->linenr++;
 236         if (c == EOF) {
 237                 cf->eof = 1;
 238                 c = '\n';
 239         }
 240         return c;
 241 }
 242
 243 static char *parse_value(void)
 244 {
 245         int quote = 0, comment = 0, space = 0;
 246
 247         strbuf_reset(&cf->value);
 248         for (;;) {
 249                 int c = get_next_char();
 250                 if (c == '\n') {
 251                         if (quote) {
 252                                 cf->linenr--;
 253                                 return NULL;
 254                         }
 255                         return cf->value.buf;
 256                 }
 257                 if (comment)
 258                         continue;
 259                 if (isspace(c) && !quote) {
 260                         if (cf->value.len)
 261                                 space++;
 262                         continue;
 263                 }
 264                 if (!quote) {
 265                         if (c == ';' || c == '#') {
 266                                 comment = 1;
 267                                 continue;
 268                         }
 269                 }
 270                 for (; space; space--)
 271                         strbuf_addch(&cf->value, ' ');
 272                 if (c == '\\') {
 273                         c = get_next_char();
 274                         switch (c) {
 275                         case '\n':
 276                                 continue;
 277                         case 't':
 278                                 c = '\t';
 279                                 break;
 280                         case 'b':
 281                                 c = '\b';
 282                                 break;
 283                         case 'n':
 284                                 c = '\n';
 285                                 break;
 286                         /* Some characters escape as themselves */
 287                         case '\\': case '"':
 288                                 break;
 289                         /* Reject unknown escape sequences */
 290                         default:
 291                                 return NULL;
 292                         }
 293                         strbuf_addch(&cf->value, c);
 294                         continue;
 295                 }
 296                 if (c == '"') {
 297                         quote = 1-quote;
 298                         continue;
 299                 }
 300                 strbuf_addch(&cf->value, c);
 301         }
 302 }
 303
 304 static inline int iskeychar(int c)
 305 {
 306         return isalnum(c) || c == '-';
 307 }
 308
 309 static int get_value(config_fn_t fn, void *data, struct strbuf *name)
 310 {
 311         int c;
 312         char *value;
 313
 314         /* Get the full name */
 315         for (;;) {
 316                 c = get_next_char();
 317                 if (cf->eof)
 318                         break;
 319                 if (!iskeychar(c))
 320                         break;
 321                 strbuf_addch(name, tolower(c));
 322         }
 323
 324         while (c == ' ' || c == '\t')
 325                 c = get_next_char();
 326
 327         value = NULL;
 328         if (c != '\n') {
 329                 if (c != '=')
 330                         return -1;
 331                 value = parse_value();
 332                 if (!value)
 333                         return -1;
 334         }
 335         return fn(name->buf, value, data);
 336 }
 337
 338 static int get_extended_base_var(struct strbuf *name, int c)
 339 {
 340         do {
 341                 if (c == '\n')
 342                         goto error_incomplete_line;
 343                 c = get_next_char();
 344         } while (isspace(c));
 345
 346         /* We require the format to be '[base "extension"]' */
 347         if (c != '"')
 348                 return -1;
 349         strbuf_addch(name, '.');
 350
 351         for (;;) {
 352                 int c = get_next_char();
 353                 if (c == '\n')
 354                         goto error_incomplete_line;
 355                 if (c == '"')
 356                         break;
 357                 if (c == '\\') {
 358                         c = get_next_char();
 359                         if (c == '\n')
 360                                 goto error_incomplete_line;
 361                 }
 362                 strbuf_addch(name, c);
 363         }
 364
 365         /* Final ']' */
 366         if (get_next_char() != ']')
 367                 return -1;
 368         return 0;
 369 error_incomplete_line:
 370         cf->linenr--;
 371         return -1;
 372 }
 373
 374 static int get_base_var(struct strbuf *name)
 375 {
 376         for (;;) {
 377                 int c = get_next_char();
 378                 if (cf->eof)
 379                         return -1;
 380                 if (c == ']')
 381                         return 0;
 382                 if (isspace(c))
 383                         return get_extended_base_var(name, c);
 384                 if (!iskeychar(c) && c != '.')
 385                         return -1;
 386                 strbuf_addch(name, tolower(c));
 387         }
 388 }
 389
 390 static int git_parse_source(config_fn_t fn, void *data)
 391 {
 392         int comment = 0;
 393         int baselen = 0;
 394         struct strbuf *var = &cf->var;
 395
 396         /* U+FEFF Byte Order Mark in UTF8 */
 397         static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 398         const unsigned char *bomptr = utf8_bom;
 399
 400         for (;;) {
 401                 int c = get_next_char();
 402                 if (bomptr && *bomptr) {
 403                         /* We are at the file beginning; skip UTF8-encoded BOM
 404                          * if present. Sane editors won't put this in on their
 405                          * own, but e.g. Windows Notepad will do it happily. */
 406                         if ((unsigned char) c == *bomptr) {
 407                                 bomptr++;
 408                                 continue;
 409                         } else {
 410                                 /* Do not tolerate partial BOM. */
 411                                 if (bomptr != utf8_bom)
 412                                         break;
 413                                 /* No BOM at file beginning. Cool. */
 414                                 bomptr = NULL;
 415                         }
 416                 }
 417                 if (c == '\n') {
 418                         if (cf->eof)
 419                                 return 0;
 420                         comment = 0;
 421                         continue;
 422                 }
 423                 if (comment || isspace(c))
 424                         continue;
 425                 if (c == '#' || c == ';') {
 426                         comment = 1;
 427                         continue;
 428                 }
 429                 if (c == '[') {
 430                         /* Reset prior to determining a new stem */
 431                         strbuf_reset(var);
 432                         if (get_base_var(var) < 0 || var->len < 1)
 433                                 break;
 434                         strbuf_addch(var, '.');
 435                         baselen = var->len;
 436                         continue;
 437                 }
 438                 if (!isalpha(c))
 439                         break;
 440                 /*
 441                  * Truncate the var name back to the section header
 442                  * stem prior to grabbing the suffix part of the name
 443                  * and the value.
 444                  */
 445                 strbuf_setlen(var, baselen);
 446                 strbuf_addch(var, tolower(c));
 447                 if (get_value(fn, data, var) < 0)
 448                         break;
 449         }
 450         if (cf->die_on_error)
 451                 die("bad config file line %d in %s", cf->linenr, cf->name);
 452         else
 453                 return error("bad config file line %d in %s", cf->linenr, cf->name);
 454 }
 455
 456 static int parse_unit_factor(const char *end, uintmax_t *val)
 457 {
 458         if (!*end)
 459                 return 1;
 460         else if (!strcasecmp(end, "k")) {
 461                 *val *= 1024;
 462                 return 1;
 463         }
 464         else if (!strcasecmp(end, "m")) {
 465                 *val *= 1024 * 1024;
 466                 return 1;
 467         }
 468         else if (!strcasecmp(end, "g")) {
 469                 *val *= 1024 * 1024 * 1024;
 470                 return 1;
 471         }
 472         return 0;
 473 }
 474
 475 static int git_parse_signed(const char *value, intmax_t *ret, intmax_t max)
 476 {
 477         if (value && *value) {
 478                 char *end;
 479                 intmax_t val;
 480                 uintmax_t uval;
 481                 uintmax_t factor = 1;
 482
 483                 errno = 0;
 484                 val = strtoimax(value, &end, 0);
 485                 if (errno == ERANGE)
 486                         return 0;
 487                 if (!parse_unit_factor(end, &factor)) {
 488                         errno = EINVAL;
 489                         return 0;
 490                 }
 491                 uval = abs(val);
 492                 uval *= factor;
 493                 if (uval > max || abs(val) > uval) {
 494                         errno = ERANGE;
 495                         return 0;
 496                 }
 497                 val *= factor;
 498                 *ret = val;
 499                 return 1;
 500         }
 501         errno = EINVAL;
 502         return 0;
 503 }
 504
 505 static int git_parse_unsigned(const char *value, uintmax_t *ret, uintmax_t max)
 506 {
 507         if (value && *value) {
 508                 char *end;
 509                 uintmax_t val;
 510                 uintmax_t oldval;
 511
 512                 errno = 0;
 513                 val = strtoumax(value, &end, 0);
 514                 if (errno == ERANGE)
 515                         return 0;
 516                 oldval = val;
 517                 if (!parse_unit_factor(end, &val)) {
 518                         errno = EINVAL;
 519                         return 0;
 520                 }
 521                 if (val > max || oldval > val) {
 522                         errno = ERANGE;
 523                         return 0;
 524                 }
 525                 *ret = val;
 526                 return 1;
 527         }
 528         errno = EINVAL;
 529         return 0;
 530 }
 531
 532 static int git_parse_int(const char *value, int *ret)
 533 {
 534         intmax_t tmp;
 535         if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int)))
 536                 return 0;
 537         *ret = tmp;
 538         return 1;
 539 }
 540
 541 static int git_parse_int64(const char *value, int64_t *ret)
 542 {
 543         intmax_t tmp;
 544         if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int64_t)))
 545                 return 0;
 546         *ret = tmp;
 547         return 1;
 548 }
 549
 550 int git_parse_ulong(const char *value, unsigned long *ret)
 551 {
 552         uintmax_t tmp;
 553         if (!git_parse_unsigned(value, &tmp, maximum_unsigned_value_of_type(long)))
 554                 return 0;
 555         *ret = tmp;
 556         return 1;
 557 }
 558
 559 NORETURN
 560 static void die_bad_number(const char *name, const char *value)
 561 {
 562         const char *reason = errno == ERANGE ?
 563                              "out of range" :
 564                              "invalid unit";
 565         if (!value)
 566                 value = "";
 567
 568         if (cf && cf->name)
 569                 die("bad numeric config value '%s' for '%s' in %s: %s",
 570                     value, name, cf->name, reason);
 571         die("bad numeric config value '%s' for '%s': %s", value, name, reason);
 572 }
 573
 574 int git_config_int(const char *name, const char *value)
 575 {
 576         int ret;
 577         if (!git_parse_int(value, &ret))
 578                 die_bad_number(name, value);
 579         return ret;
 580 }
 581
 582 int64_t git_config_int64(const char *name, const char *value)
 583 {
 584         int64_t ret;
 585         if (!git_parse_int64(value, &ret))
 586                 die_bad_number(name, value);
 587         return ret;
 588 }
 589
 590 unsigned long git_config_ulong(const char *name, const char *value)
 591 {
 592         unsigned long ret;
 593         if (!git_parse_ulong(value, &ret))
 594                 die_bad_number(name, value);
 595         return ret;
 596 }
 597
 598 static int git_config_maybe_bool_text(const char *name, const char *value)
 599 {
 600         if (!value)
 601                 return 1;
 602         if (!*value)
 603                 return 0;
 604         if (!strcasecmp(value, "true")
 605             || !strcasecmp(value, "yes")
 606             || !strcasecmp(value, "on"))
 607                 return 1;
 608         if (!strcasecmp(value, "false")
 609             || !strcasecmp(value, "no")
 610             || !strcasecmp(value, "off"))
 611                 return 0;
 612         return -1;
 613 }
 614
 615 int git_config_maybe_bool(const char *name, const char *value)
 616 {
 617         int v = git_config_maybe_bool_text(name, value);
 618         if (0 <= v)
 619                 return v;
 620         if (git_parse_int(value, &v))
 621                 return !!v;
 622         return -1;
 623 }
 624
 625 int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 626 {
 627         int v = git_config_maybe_bool_text(name, value);
 628         if (0 <= v) {
 629                 *is_bool = 1;
 630                 return v;
 631         }
 632         *is_bool = 0;
 633         return git_config_int(name, value);
 634 }
 635
 636 int git_config_bool(const char *name, const char *value)
 637 {
 638         int discard;
 639         return !!git_config_bool_or_int(name, value, &discard);
 640 }
 641
 642 int git_config_string(const char **dest, const char *var, const char *value)
 643 {
 644         if (!value)
 645                 return config_error_nonbool(var);
 646         *dest = xstrdup(value);
 647         return 0;
 648 }
 649
 650 int git_config_pathname(const char **dest, const char *var, const char *value)
 651 {
 652         if (!value)
 653                 return config_error_nonbool(var);
 654         *dest = expand_user_path(value);
 655         if (!*dest)
 656                 die("Failed to expand user dir in: '%s'", value);
 657         return 0;
 658 }
 659
 660 static int git_default_core_config(const char *var, const char *value)
 661 {
 662         /* This needs a better name */
 663         if (!strcmp(var, "core.filemode")) {
 664                 trust_executable_bit = git_config_bool(var, value);
 665                 return 0;
 666         }
 667         if (!strcmp(var, "core.trustctime")) {
 668                 trust_ctime = git_config_bool(var, value);
 669                 return 0;
 670         }
 671         if (!strcmp(var, "core.statinfo") ||
 672             !strcmp(var, "core.checkstat")) {
 673                 /*
 674                  * NEEDSWORK: statinfo was a typo in v1.8.2 that has
 675                  * never been advertised.  we will remove it at Git
 676                  * 2.0 boundary.
 677                  */
 678                 if (!strcmp(var, "core.statinfo")) {
 679                         static int warned;
 680                         if (!warned++) {
 681                                 warning("'core.statinfo' will be removed in Git 2.0; "
 682                                         "use 'core.checkstat' instead.");
 683                         }
 684                 }
 685                 if (!strcasecmp(value, "default"))
 686                         check_stat = 1;
 687                 else if (!strcasecmp(value, "minimal"))
 688                         check_stat = 0;
 689         }
 690
 691         if (!strcmp(var, "core.quotepath")) {
 692                 quote_path_fully = git_config_bool(var, value);
 693                 return 0;
 694         }
 695
 696         if (!strcmp(var, "core.symlinks")) {
 697                 has_symlinks = git_config_bool(var, value);
 698                 return 0;
 699         }
 700
 701         if (!strcmp(var, "core.ignorecase")) {
 702                 ignore_case = git_config_bool(var, value);
 703                 return 0;
 704         }
 705
 706         if (!strcmp(var, "core.attributesfile"))
 707                 return git_config_pathname(&git_attributes_file, var, value);
 708
 709         if (!strcmp(var, "core.bare")) {
 710                 is_bare_repository_cfg = git_config_bool(var, value);
 711                 return 0;
 712         }
 713
 714         if (!strcmp(var, "core.ignorestat")) {
 715                 assume_unchanged = git_config_bool(var, value);
 716                 return 0;
 717         }
 718
 719         if (!strcmp(var, "core.prefersymlinkrefs")) {
 720                 prefer_symlink_refs = git_config_bool(var, value);
 721                 return 0;
 722         }
 723
 724         if (!strcmp(var, "core.logallrefupdates")) {
 725                 log_all_ref_updates = git_config_bool(var, value);
 726                 return 0;
 727         }
 728
 729         if (!strcmp(var, "core.warnambiguousrefs")) {
 730                 warn_ambiguous_refs = git_config_bool(var, value);
 731                 return 0;
 732         }
 733
 734         if (!strcmp(var, "core.abbrev")) {
 735                 int abbrev = git_config_int(var, value);
 736                 if (abbrev < minimum_abbrev || abbrev > 40)
 737                         return -1;
 738                 default_abbrev = abbrev;
 739                 return 0;
 740         }
 741
 742         if (!strcmp(var, "core.loosecompression")) {
 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                 zlib_compression_level = level;
 749                 zlib_compression_seen = 1;
 750                 return 0;
 751         }
 752
 753         if (!strcmp(var, "core.compression")) {
 754                 int level = git_config_int(var, value);
 755                 if (level == -1)
 756                         level = Z_DEFAULT_COMPRESSION;
 757                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 758                         die("bad zlib compression level %d", level);
 759                 core_compression_level = level;
 760                 core_compression_seen = 1;
 761                 if (!zlib_compression_seen)
 762                         zlib_compression_level = level;
 763                 return 0;
 764         }
 765
 766         if (!strcmp(var, "core.packedgitwindowsize")) {
 767                 int pgsz_x2 = getpagesize() * 2;
 768                 packed_git_window_size = git_config_ulong(var, value);
 769
 770                 /* This value must be multiple of (pagesize * 2) */
 771                 packed_git_window_size /= pgsz_x2;
 772                 if (packed_git_window_size < 1)
 773                         packed_git_window_size = 1;
 774                 packed_git_window_size *= pgsz_x2;
 775                 return 0;
 776         }
 777
 778         if (!strcmp(var, "core.bigfilethreshold")) {
 779                 big_file_threshold = git_config_ulong(var, value);
 780                 return 0;
 781         }
 782
 783         if (!strcmp(var, "core.packedgitlimit")) {
 784                 packed_git_limit = git_config_ulong(var, value);
 785                 return 0;
 786         }
 787
 788         if (!strcmp(var, "core.deltabasecachelimit")) {
 789                 delta_base_cache_limit = git_config_ulong(var, value);
 790                 return 0;
 791         }
 792
 793         if (!strcmp(var, "core.autocrlf")) {
 794                 if (value && !strcasecmp(value, "input")) {
 795                         if (core_eol == EOL_CRLF)
 796                                 return error("core.autocrlf=input conflicts with core.eol=crlf");
 797                         auto_crlf = AUTO_CRLF_INPUT;
 798                         return 0;
 799                 }
 800                 auto_crlf = git_config_bool(var, value);
 801                 return 0;
 802         }
 803
 804         if (!strcmp(var, "core.safecrlf")) {
 805                 if (value && !strcasecmp(value, "warn")) {
 806                         safe_crlf = SAFE_CRLF_WARN;
 807                         return 0;
 808                 }
 809                 safe_crlf = git_config_bool(var, value);
 810                 return 0;
 811         }
 812
 813         if (!strcmp(var, "core.eol")) {
 814                 if (value && !strcasecmp(value, "lf"))
 815                         core_eol = EOL_LF;
 816                 else if (value && !strcasecmp(value, "crlf"))
 817                         core_eol = EOL_CRLF;
 818                 else if (value && !strcasecmp(value, "native"))
 819                         core_eol = EOL_NATIVE;
 820                 else
 821                         core_eol = EOL_UNSET;
 822                 if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 823                         return error("core.autocrlf=input conflicts with core.eol=crlf");
 824                 return 0;
 825         }
 826
 827         if (!strcmp(var, "core.notesref")) {
 828                 notes_ref_name = xstrdup(value);
 829                 return 0;
 830         }
 831
 832         if (!strcmp(var, "core.pager"))
 833                 return git_config_string(&pager_program, var, value);
 834
 835         if (!strcmp(var, "core.editor"))
 836                 return git_config_string(&editor_program, var, value);
 837
 838         if (!strcmp(var, "core.commentchar")) {
 839                 const char *comment;
 840                 int ret = git_config_string(&comment, var, value);
 841                 if (!ret)
 842                         comment_line_char = comment[0];
 843                 return ret;
 844         }
 845
 846         if (!strcmp(var, "core.askpass"))
 847                 return git_config_string(&askpass_program, var, value);
 848
 849         if (!strcmp(var, "core.excludesfile"))
 850                 return git_config_pathname(&excludes_file, var, value);
 851
 852         if (!strcmp(var, "core.whitespace")) {
 853                 if (!value)
 854                         return config_error_nonbool(var);
 855                 whitespace_rule_cfg = parse_whitespace_rule(value);
 856                 return 0;
 857         }
 858
 859         if (!strcmp(var, "core.fsyncobjectfiles")) {
 860                 fsync_object_files = git_config_bool(var, value);
 861                 return 0;
 862         }
 863
 864         if (!strcmp(var, "core.preloadindex")) {
 865                 core_preload_index = git_config_bool(var, value);
 866                 return 0;
 867         }
 868
 869         if (!strcmp(var, "core.createobject")) {
 870                 if (!strcmp(value, "rename"))
 871                         object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 872                 else if (!strcmp(value, "link"))
 873                         object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 874                 else
 875                         die("Invalid mode for object creation: %s", value);
 876                 return 0;
 877         }
 878
 879         if (!strcmp(var, "core.sparsecheckout")) {
 880                 core_apply_sparse_checkout = git_config_bool(var, value);
 881                 return 0;
 882         }
 883
 884         if (!strcmp(var, "core.precomposeunicode")) {
 885                 precomposed_unicode = git_config_bool(var, value);
 886                 return 0;
 887         }
 888
 889         /* Add other config variables here and to Documentation/config.txt. */
 890         return 0;
 891 }
 892
 893 static int git_default_i18n_config(const char *var, const char *value)
 894 {
 895         if (!strcmp(var, "i18n.commitencoding"))
 896                 return git_config_string(&git_commit_encoding, var, value);
 897
 898         if (!strcmp(var, "i18n.logoutputencoding"))
 899                 return git_config_string(&git_log_output_encoding, var, value);
 900
 901         /* Add other config variables here and to Documentation/config.txt. */
 902         return 0;
 903 }
 904
 905 static int git_default_branch_config(const char *var, const char *value)
 906 {
 907         if (!strcmp(var, "branch.autosetupmerge")) {
 908                 if (value && !strcasecmp(value, "always")) {
 909                         git_branch_track = BRANCH_TRACK_ALWAYS;
 910                         return 0;
 911                 }
 912                 git_branch_track = git_config_bool(var, value);
 913                 return 0;
 914         }
 915         if (!strcmp(var, "branch.autosetuprebase")) {
 916                 if (!value)
 917                         return config_error_nonbool(var);
 918                 else if (!strcmp(value, "never"))
 919                         autorebase = AUTOREBASE_NEVER;
 920                 else if (!strcmp(value, "local"))
 921                         autorebase = AUTOREBASE_LOCAL;
 922                 else if (!strcmp(value, "remote"))
 923                         autorebase = AUTOREBASE_REMOTE;
 924                 else if (!strcmp(value, "always"))
 925                         autorebase = AUTOREBASE_ALWAYS;
 926                 else
 927                         return error("Malformed value for %s", var);
 928                 return 0;
 929         }
 930
 931         /* Add other config variables here and to Documentation/config.txt. */
 932         return 0;
 933 }
 934
 935 static int git_default_push_config(const char *var, const char *value)
 936 {
 937         if (!strcmp(var, "push.default")) {
 938                 if (!value)
 939                         return config_error_nonbool(var);
 940                 else if (!strcmp(value, "nothing"))
 941                         push_default = PUSH_DEFAULT_NOTHING;
 942                 else if (!strcmp(value, "matching"))
 943                         push_default = PUSH_DEFAULT_MATCHING;
 944                 else if (!strcmp(value, "simple"))
 945                         push_default = PUSH_DEFAULT_SIMPLE;
 946                 else if (!strcmp(value, "upstream"))
 947                         push_default = PUSH_DEFAULT_UPSTREAM;
 948                 else if (!strcmp(value, "tracking")) /* deprecated */
 949                         push_default = PUSH_DEFAULT_UPSTREAM;
 950                 else if (!strcmp(value, "current"))
 951                         push_default = PUSH_DEFAULT_CURRENT;
 952                 else {
 953                         error("Malformed value for %s: %s", var, value);
 954                         return error("Must be one of nothing, matching, simple, "
 955                                      "upstream or current.");
 956                 }
 957                 return 0;
 958         }
 959
 960         /* Add other config variables here and to Documentation/config.txt. */
 961         return 0;
 962 }
 963
 964 static int git_default_mailmap_config(const char *var, const char *value)
 965 {
 966         if (!strcmp(var, "mailmap.file"))
 967                 return git_config_string(&git_mailmap_file, var, value);
 968         if (!strcmp(var, "mailmap.blob"))
 969                 return git_config_string(&git_mailmap_blob, var, value);
 970
 971         /* Add other config variables here and to Documentation/config.txt. */
 972         return 0;
 973 }
 974
 975 int git_default_config(const char *var, const char *value, void *dummy)
 976 {
 977         if (starts_with(var, "core."))
 978                 return git_default_core_config(var, value);
 979
 980         if (starts_with(var, "user."))
 981                 return git_ident_config(var, value, dummy);
 982
 983         if (starts_with(var, "i18n."))
 984                 return git_default_i18n_config(var, value);
 985
 986         if (starts_with(var, "branch."))
 987                 return git_default_branch_config(var, value);
 988
 989         if (starts_with(var, "push."))
 990                 return git_default_push_config(var, value);
 991
 992         if (starts_with(var, "mailmap."))
 993                 return git_default_mailmap_config(var, value);
 994
 995         if (starts_with(var, "advice."))
 996                 return git_default_advice_config(var, value);
 997
 998         if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 999                 pager_use_color = git_config_bool(var,value);
1000                 return 0;
1001         }
1002
1003         if (!strcmp(var, "pack.packsizelimit")) {
1004                 pack_size_limit_cfg = git_config_ulong(var, value);
1005                 return 0;
1006         }
1007         /* Add other config variables here and to Documentation/config.txt. */
1008         return 0;
1009 }
1010
1011 /*
1012  * All source specific fields in the union, die_on_error, name and the callbacks
1013  * fgetc, ungetc, ftell of top need to be initialized before calling
1014  * this function.
1015  */
1016 static int do_config_from(struct config_source *top, config_fn_t fn, void *data)
1017 {
1018         int ret;
1019
1020         /* push config-file parsing state stack */
1021         top->prev = cf;
1022         top->linenr = 1;
1023         top->eof = 0;
1024         strbuf_init(&top->value, 1024);
1025         strbuf_init(&top->var, 1024);
1026         cf = top;
1027
1028         ret = git_parse_source(fn, data);
1029
1030         /* pop config-file parsing state stack */
1031         strbuf_release(&top->value);
1032         strbuf_release(&top->var);
1033         cf = top->prev;
1034
1035         return ret;
1036 }
1037
1038 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
1039 {
1040         int ret;
1041         FILE *f = fopen(filename, "r");
1042
1043         ret = -1;
1044         if (f) {
1045                 struct config_source top;
1046
1047                 top.u.file = f;
1048                 top.name = filename;
1049                 top.die_on_error = 1;
1050                 top.do_fgetc = config_file_fgetc;
1051                 top.do_ungetc = config_file_ungetc;
1052                 top.do_ftell = config_file_ftell;
1053
1054                 ret = do_config_from(&top, fn, data);
1055
1056                 fclose(f);
1057         }
1058         return ret;
1059 }
1060
1061 int git_config_from_buf(config_fn_t fn, const char *name, const char *buf,
1062                         size_t len, void *data)
1063 {
1064         struct config_source top;
1065
1066         top.u.buf.buf = buf;
1067         top.u.buf.len = len;
1068         top.u.buf.pos = 0;
1069         top.name = name;
1070         top.die_on_error = 0;
1071         top.do_fgetc = config_buf_fgetc;
1072         top.do_ungetc = config_buf_ungetc;
1073         top.do_ftell = config_buf_ftell;
1074
1075         return do_config_from(&top, fn, data);
1076 }
1077
1078 static int git_config_from_blob_sha1(config_fn_t fn,
1079                                      const char *name,
1080                                      const unsigned char *sha1,
1081                                      void *data)
1082 {
1083         enum object_type type;
1084         char *buf;
1085         unsigned long size;
1086         int ret;
1087
1088         buf = read_sha1_file(sha1, &type, &size);
1089         if (!buf)
1090                 return error("unable to load config blob object '%s'", name);
1091         if (type != OBJ_BLOB) {
1092                 free(buf);
1093                 return error("reference '%s' does not point to a blob", name);
1094         }
1095
1096         ret = git_config_from_buf(fn, name, buf, size, data);
1097         free(buf);
1098
1099         return ret;
1100 }
1101
1102 static int git_config_from_blob_ref(config_fn_t fn,
1103                                     const char *name,
1104                                     void *data)
1105 {
1106         unsigned char sha1[20];
1107
1108         if (get_sha1(name, sha1) < 0)
1109                 return error("unable to resolve config blob '%s'", name);
1110         return git_config_from_blob_sha1(fn, name, sha1, data);
1111 }
1112
1113 const char *git_etc_gitconfig(void)
1114 {
1115         static const char *system_wide;
1116         if (!system_wide)
1117                 system_wide = system_path(ETC_GITCONFIG);
1118         return system_wide;
1119 }
1120
1121 int git_env_bool(const char *k, int def)
1122 {
1123         const char *v = getenv(k);
1124         return v ? git_config_bool(k, v) : def;
1125 }
1126
1127 int git_config_system(void)
1128 {
1129         return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
1130 }
1131
1132 int git_config_early(config_fn_t fn, void *data, const char *repo_config)
1133 {
1134         int ret = 0, found = 0;
1135         char *xdg_config = NULL;
1136         char *user_config = NULL;
1137
1138         home_config_paths(&user_config, &xdg_config, "config");
1139
1140         if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0)) {
1141                 ret += git_config_from_file(fn, git_etc_gitconfig(),
1142                                             data);
1143                 found += 1;
1144         }
1145
1146         if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK)) {
1147                 ret += git_config_from_file(fn, xdg_config, data);
1148                 found += 1;
1149         }
1150
1151         if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK)) {
1152                 ret += git_config_from_file(fn, user_config, data);
1153                 found += 1;
1154         }
1155
1156         if (repo_config && !access_or_die(repo_config, R_OK, 0)) {
1157                 ret += git_config_from_file(fn, repo_config, data);
1158                 found += 1;
1159         }
1160
1161         switch (git_config_from_parameters(fn, data)) {
1162         case -1: /* error */
1163                 die("unable to parse command-line config");
1164                 break;
1165         case 0: /* found nothing */
1166                 break;
1167         default: /* found at least one item */
1168                 found++;
1169                 break;
1170         }
1171
1172         free(xdg_config);
1173         free(user_config);
1174         return ret == 0 ? found : ret;
1175 }
1176
1177 int git_config_with_options(config_fn_t fn, void *data,
1178                             const char *filename,
1179                             const char *blob_ref,
1180                             int respect_includes)
1181 {
1182         char *repo_config = NULL;
1183         int ret;
1184         struct config_include_data inc = CONFIG_INCLUDE_INIT;
1185
1186         if (respect_includes) {
1187                 inc.fn = fn;
1188                 inc.data = data;
1189                 fn = git_config_include;
1190                 data = &inc;
1191         }
1192
1193         /*
1194          * If we have a specific filename, use it. Otherwise, follow the
1195          * regular lookup sequence.
1196          */
1197         if (filename)
1198                 return git_config_from_file(fn, filename, data);
1199         else if (blob_ref)
1200                 return git_config_from_blob_ref(fn, blob_ref, data);
1201
1202         repo_config = git_pathdup("config");
1203         ret = git_config_early(fn, data, repo_config);
1204         if (repo_config)
1205                 free(repo_config);
1206         return ret;
1207 }
1208
1209 int git_config(config_fn_t fn, void *data)
1210 {
1211         return git_config_with_options(fn, data, NULL, NULL, 1);
1212 }
1213
1214 /*
1215  * Find all the stuff for git_config_set() below.
1216  */
1217
1218 static struct {
1219         int baselen;
1220         char *key;
1221         int do_not_match;
1222         regex_t *value_regex;
1223         int multi_replace;
1224         size_t *offset;
1225         unsigned int offset_alloc;
1226         enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1227         int seen;
1228 } store;
1229
1230 static int matches(const char *key, const char *value)
1231 {
1232         return !strcmp(key, store.key) &&
1233                 (store.value_regex == NULL ||
1234                  (store.do_not_match ^
1235                   !regexec(store.value_regex, value, 0, NULL, 0)));
1236 }
1237
1238 static int store_aux(const char *key, const char *value, void *cb)
1239 {
1240         const char *ep;
1241         size_t section_len;
1242
1243         switch (store.state) {
1244         case KEY_SEEN:
1245                 if (matches(key, value)) {
1246                         if (store.seen == 1 && store.multi_replace == 0) {
1247                                 warning("%s has multiple values", key);
1248                         }
1249
1250                         ALLOC_GROW(store.offset, store.seen + 1,
1251                                    store.offset_alloc);
1252
1253                         store.offset[store.seen] = cf->do_ftell(cf);
1254                         store.seen++;
1255                 }
1256                 break;
1257         case SECTION_SEEN:
1258                 /*
1259                  * What we are looking for is in store.key (both
1260                  * section and var), and its section part is baselen
1261                  * long.  We found key (again, both section and var).
1262                  * We would want to know if this key is in the same
1263                  * section as what we are looking for.  We already
1264                  * know we are in the same section as what should
1265                  * hold store.key.
1266                  */
1267                 ep = strrchr(key, '.');
1268                 section_len = ep - key;
1269
1270                 if ((section_len != store.baselen) ||
1271                     memcmp(key, store.key, section_len+1)) {
1272                         store.state = SECTION_END_SEEN;
1273                         break;
1274                 }
1275
1276                 /*
1277                  * Do not increment matches: this is no match, but we
1278                  * just made sure we are in the desired section.
1279                  */
1280                 ALLOC_GROW(store.offset, store.seen + 1,
1281                            store.offset_alloc);
1282                 store.offset[store.seen] = cf->do_ftell(cf);
1283                 /* fallthru */
1284         case SECTION_END_SEEN:
1285         case START:
1286                 if (matches(key, value)) {
1287                         ALLOC_GROW(store.offset, store.seen + 1,
1288                                    store.offset_alloc);
1289                         store.offset[store.seen] = cf->do_ftell(cf);
1290                         store.state = KEY_SEEN;
1291                         store.seen++;
1292                 } else {
1293                         if (strrchr(key, '.') - key == store.baselen &&
1294                               !strncmp(key, store.key, store.baselen)) {
1295                                         store.state = SECTION_SEEN;
1296                                         ALLOC_GROW(store.offset,
1297                                                    store.seen + 1,
1298                                                    store.offset_alloc);
1299                                         store.offset[store.seen] = cf->do_ftell(cf);
1300                         }
1301                 }
1302         }
1303         return 0;
1304 }
1305
1306 static int write_error(const char *filename)
1307 {
1308         error("failed to write new configuration file %s", filename);
1309
1310         /* Same error code as "failed to rename". */
1311         return 4;
1312 }
1313
1314 static int store_write_section(int fd, const char *key)
1315 {
1316         const char *dot;
1317         int i, success;
1318         struct strbuf sb = STRBUF_INIT;
1319
1320         dot = memchr(key, '.', store.baselen);
1321         if (dot) {
1322                 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1323                 for (i = dot - key + 1; i < store.baselen; i++) {
1324                         if (key[i] == '"' || key[i] == '\\')
1325                                 strbuf_addch(&sb, '\\');
1326                         strbuf_addch(&sb, key[i]);
1327                 }
1328                 strbuf_addstr(&sb, "\"]\n");
1329         } else {
1330                 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1331         }
1332
1333         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1334         strbuf_release(&sb);
1335
1336         return success;
1337 }
1338
1339 static int store_write_pair(int fd, const char *key, const char *value)
1340 {
1341         int i, success;
1342         int length = strlen(key + store.baselen + 1);
1343         const char *quote = "";
1344         struct strbuf sb = STRBUF_INIT;
1345
1346         /*
1347          * Check to see if the value needs to be surrounded with a dq pair.
1348          * Note that problematic characters are always backslash-quoted; this
1349          * check is about not losing leading or trailing SP and strings that
1350          * follow beginning-of-comment characters (i.e. ';' and '#') by the
1351          * configuration parser.
1352          */
1353         if (value[0] == ' ')
1354                 quote = "\"";
1355         for (i = 0; value[i]; i++)
1356                 if (value[i] == ';' || value[i] == '#')
1357                         quote = "\"";
1358         if (i && value[i - 1] == ' ')
1359                 quote = "\"";
1360
1361         strbuf_addf(&sb, "\t%.*s = %s",
1362                     length, key + store.baselen + 1, quote);
1363
1364         for (i = 0; value[i]; i++)
1365                 switch (value[i]) {
1366                 case '\n':
1367                         strbuf_addstr(&sb, "\\n");
1368                         break;
1369                 case '\t':
1370                         strbuf_addstr(&sb, "\\t");
1371                         break;
1372                 case '"':
1373                 case '\\':
1374                         strbuf_addch(&sb, '\\');
1375                 default:
1376                         strbuf_addch(&sb, value[i]);
1377                         break;
1378                 }
1379         strbuf_addf(&sb, "%s\n", quote);
1380
1381         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1382         strbuf_release(&sb);
1383
1384         return success;
1385 }
1386
1387 static ssize_t find_beginning_of_line(const char *contents, size_t size,
1388         size_t offset_, int *found_bracket)
1389 {
1390         size_t equal_offset = size, bracket_offset = size;
1391         ssize_t offset;
1392
1393 contline:
1394         for (offset = offset_-2; offset > 0
1395                         && contents[offset] != '\n'; offset--)
1396                 switch (contents[offset]) {
1397                         case '=': equal_offset = offset; break;
1398                         case ']': bracket_offset = offset; break;
1399                 }
1400         if (offset > 0 && contents[offset-1] == '\\') {
1401                 offset_ = offset;
1402                 goto contline;
1403         }
1404         if (bracket_offset < equal_offset) {
1405                 *found_bracket = 1;
1406                 offset = bracket_offset+1;
1407         } else
1408                 offset++;
1409
1410         return offset;
1411 }
1412
1413 int git_config_set_in_file(const char *config_filename,
1414                         const char *key, const char *value)
1415 {
1416         return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1417 }
1418
1419 int git_config_set(const char *key, const char *value)
1420 {
1421         return git_config_set_multivar(key, value, NULL, 0);
1422 }
1423
1424 /*
1425  * Auxiliary function to sanity-check and split the key into the section
1426  * identifier and variable name.
1427  *
1428  * Returns 0 on success, -1 when there is an invalid character in the key and
1429  * -2 if there is no section name in the key.
1430  *
1431  * store_key - pointer to char* which will hold a copy of the key with
1432  *             lowercase section and variable name
1433  * baselen - pointer to int which will hold the length of the
1434  *           section + subsection part, can be NULL
1435  */
1436 int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1437 {
1438         int i, dot, baselen;
1439         const char *last_dot = strrchr(key, '.');
1440
1441         /*
1442          * Since "key" actually contains the section name and the real
1443          * key name separated by a dot, we have to know where the dot is.
1444          */
1445
1446         if (last_dot == NULL || last_dot == key) {
1447                 error("key does not contain a section: %s", key);
1448                 return -CONFIG_NO_SECTION_OR_NAME;
1449         }
1450
1451         if (!last_dot[1]) {
1452                 error("key does not contain variable name: %s", key);
1453                 return -CONFIG_NO_SECTION_OR_NAME;
1454         }
1455
1456         baselen = last_dot - key;
1457         if (baselen_)
1458                 *baselen_ = baselen;
1459
1460         /*
1461          * Validate the key and while at it, lower case it for matching.
1462          */
1463         *store_key = xmalloc(strlen(key) + 1);
1464
1465         dot = 0;
1466         for (i = 0; key[i]; i++) {
1467                 unsigned char c = key[i];
1468                 if (c == '.')
1469                         dot = 1;
1470                 /* Leave the extended basename untouched.. */
1471                 if (!dot || i > baselen) {
1472                         if (!iskeychar(c) ||
1473                             (i == baselen + 1 && !isalpha(c))) {
1474                                 error("invalid key: %s", key);
1475                                 goto out_free_ret_1;
1476                         }
1477                         c = tolower(c);
1478                 } else if (c == '\n') {
1479                         error("invalid key (newline): %s", key);
1480                         goto out_free_ret_1;
1481                 }
1482                 (*store_key)[i] = c;
1483         }
1484         (*store_key)[i] = 0;
1485
1486         return 0;
1487
1488 out_free_ret_1:
1489         free(*store_key);
1490         *store_key = NULL;
1491         return -CONFIG_INVALID_KEY;
1492 }
1493
1494 /*
1495  * If value==NULL, unset in (remove from) config,
1496  * if value_regex!=NULL, disregard key/value pairs where value does not match.
1497  * if multi_replace==0, nothing, or only one matching key/value is replaced,
1498  *     else all matching key/values (regardless how many) are removed,
1499  *     before the new pair is written.
1500  *
1501  * Returns 0 on success.
1502  *
1503  * This function does this:
1504  *
1505  * - it locks the config file by creating ".git/config.lock"
1506  *
1507  * - it then parses the config using store_aux() as validator to find
1508  *   the position on the key/value pair to replace. If it is to be unset,
1509  *   it must be found exactly once.
1510  *
1511  * - the config file is mmap()ed and the part before the match (if any) is
1512  *   written to the lock file, then the changed part and the rest.
1513  *
1514  * - the config file is removed and the lock file rename()d to it.
1515  *
1516  */
1517 int git_config_set_multivar_in_file(const char *config_filename,
1518                                 const char *key, const char *value,
1519                                 const char *value_regex, int multi_replace)
1520 {
1521         int fd = -1, in_fd;
1522         int ret;
1523         struct lock_file *lock = NULL;
1524         char *filename_buf = NULL;
1525
1526         /* parse-key returns negative; flip the sign to feed exit(3) */
1527         ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1528         if (ret)
1529                 goto out_free;
1530
1531         store.multi_replace = multi_replace;
1532
1533         if (!config_filename)
1534                 config_filename = filename_buf = git_pathdup("config");
1535
1536         /*
1537          * The lock serves a purpose in addition to locking: the new
1538          * contents of .git/config will be written into it.
1539          */
1540         lock = xcalloc(sizeof(struct lock_file), 1);
1541         fd = hold_lock_file_for_update(lock, config_filename, 0);
1542         if (fd < 0) {
1543                 error("could not lock config file %s: %s", config_filename, strerror(errno));
1544                 free(store.key);
1545                 ret = CONFIG_NO_LOCK;
1546                 goto out_free;
1547         }
1548
1549         /*
1550          * If .git/config does not exist yet, write a minimal version.
1551          */
1552         in_fd = open(config_filename, O_RDONLY);
1553         if ( in_fd < 0 ) {
1554                 free(store.key);
1555
1556                 if ( ENOENT != errno ) {
1557                         error("opening %s: %s", config_filename,
1558                               strerror(errno));
1559                         ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1560                         goto out_free;
1561                 }
1562                 /* if nothing to unset, error out */
1563                 if (value == NULL) {
1564                         ret = CONFIG_NOTHING_SET;
1565                         goto out_free;
1566                 }
1567
1568                 store.key = (char *)key;
1569                 if (!store_write_section(fd, key) ||
1570                     !store_write_pair(fd, key, value))
1571                         goto write_err_out;
1572         } else {
1573                 struct stat st;
1574                 char *contents;
1575                 size_t contents_sz, copy_begin, copy_end;
1576                 int i, new_line = 0;
1577
1578                 if (value_regex == NULL)
1579                         store.value_regex = NULL;
1580                 else {
1581                         if (value_regex[0] == '!') {
1582                                 store.do_not_match = 1;
1583                                 value_regex++;
1584                         } else
1585                                 store.do_not_match = 0;
1586
1587                         store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1588                         if (regcomp(store.value_regex, value_regex,
1589                                         REG_EXTENDED)) {
1590                                 error("invalid pattern: %s", value_regex);
1591                                 free(store.value_regex);
1592                                 ret = CONFIG_INVALID_PATTERN;
1593                                 goto out_free;
1594                         }
1595                 }
1596
1597                 ALLOC_GROW(store.offset, 1, store.offset_alloc);
1598                 store.offset[0] = 0;
1599                 store.state = START;
1600                 store.seen = 0;
1601
1602                 /*
1603                  * After this, store.offset will contain the *end* offset
1604                  * of the last match, or remain at 0 if no match was found.
1605                  * As a side effect, we make sure to transform only a valid
1606                  * existing config file.
1607                  */
1608                 if (git_config_from_file(store_aux, config_filename, NULL)) {
1609                         error("invalid config file %s", config_filename);
1610                         free(store.key);
1611                         if (store.value_regex != NULL) {
1612                                 regfree(store.value_regex);
1613                                 free(store.value_regex);
1614                         }
1615                         ret = CONFIG_INVALID_FILE;
1616                         goto out_free;
1617                 }
1618
1619                 free(store.key);
1620                 if (store.value_regex != NULL) {
1621                         regfree(store.value_regex);
1622                         free(store.value_regex);
1623                 }
1624
1625                 /* if nothing to unset, or too many matches, error out */
1626                 if ((store.seen == 0 && value == NULL) ||
1627                                 (store.seen > 1 && multi_replace == 0)) {
1628                         ret = CONFIG_NOTHING_SET;
1629                         goto out_free;
1630                 }
1631
1632                 fstat(in_fd, &st);
1633                 contents_sz = xsize_t(st.st_size);
1634                 contents = xmmap(NULL, contents_sz, PROT_READ,
1635                         MAP_PRIVATE, in_fd, 0);
1636                 close(in_fd);
1637
1638                 if (store.seen == 0)
1639                         store.seen = 1;
1640
1641                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1642                         if (store.offset[i] == 0) {
1643                                 store.offset[i] = copy_end = contents_sz;
1644                         } else if (store.state != KEY_SEEN) {
1645                                 copy_end = store.offset[i];
1646                         } else
1647                                 copy_end = find_beginning_of_line(
1648                                         contents, contents_sz,
1649                                         store.offset[i]-2, &new_line);
1650
1651                         if (copy_end > 0 && contents[copy_end-1] != '\n')
1652                                 new_line = 1;
1653
1654                         /* write the first part of the config */
1655                         if (copy_end > copy_begin) {
1656                                 if (write_in_full(fd, contents + copy_begin,
1657                                                   copy_end - copy_begin) <
1658                                     copy_end - copy_begin)
1659                                         goto write_err_out;
1660                                 if (new_line &&
1661                                     write_str_in_full(fd, "\n") != 1)
1662                                         goto write_err_out;
1663                         }
1664                         copy_begin = store.offset[i];
1665                 }
1666
1667                 /* write the pair (value == NULL means unset) */
1668                 if (value != NULL) {
1669                         if (store.state == START) {
1670                                 if (!store_write_section(fd, key))
1671                                         goto write_err_out;
1672                         }
1673                         if (!store_write_pair(fd, key, value))
1674                                 goto write_err_out;
1675                 }
1676
1677                 /* write the rest of the config */
1678                 if (copy_begin < contents_sz)
1679                         if (write_in_full(fd, contents + copy_begin,
1680                                           contents_sz - copy_begin) <
1681                             contents_sz - copy_begin)
1682                                 goto write_err_out;
1683
1684                 munmap(contents, contents_sz);
1685         }
1686
1687         if (commit_lock_file(lock) < 0) {
1688                 error("could not commit config file %s", config_filename);
1689                 ret = CONFIG_NO_WRITE;
1690                 goto out_free;
1691         }
1692
1693         /*
1694          * lock is committed, so don't try to roll it back below.
1695          * NOTE: Since lockfile.c keeps a linked list of all created
1696          * lock_file structures, it isn't safe to free(lock).  It's
1697          * better to just leave it hanging around.
1698          */
1699         lock = NULL;
1700         ret = 0;
1701
1702 out_free:
1703         if (lock)
1704                 rollback_lock_file(lock);
1705         free(filename_buf);
1706         return ret;
1707
1708 write_err_out:
1709         ret = write_error(lock->filename);
1710         goto out_free;
1711
1712 }
1713
1714 int git_config_set_multivar(const char *key, const char *value,
1715                         const char *value_regex, int multi_replace)
1716 {
1717         return git_config_set_multivar_in_file(NULL, key, value, value_regex,
1718                                                multi_replace);
1719 }
1720
1721 static int section_name_match (const char *buf, const char *name)
1722 {
1723         int i = 0, j = 0, dot = 0;
1724         if (buf[i] != '[')
1725                 return 0;
1726         for (i = 1; buf[i] && buf[i] != ']'; i++) {
1727                 if (!dot && isspace(buf[i])) {
1728                         dot = 1;
1729                         if (name[j++] != '.')
1730                                 break;
1731                         for (i++; isspace(buf[i]); i++)
1732                                 ; /* do nothing */
1733                         if (buf[i] != '"')
1734                                 break;
1735                         continue;
1736                 }
1737                 if (buf[i] == '\\' && dot)
1738                         i++;
1739                 else if (buf[i] == '"' && dot) {
1740                         for (i++; isspace(buf[i]); i++)
1741                                 ; /* do_nothing */
1742                         break;
1743                 }
1744                 if (buf[i] != name[j++])
1745                         break;
1746         }
1747         if (buf[i] == ']' && name[j] == 0) {
1748                 /*
1749                  * We match, now just find the right length offset by
1750                  * gobbling up any whitespace after it, as well
1751                  */
1752                 i++;
1753                 for (; buf[i] && isspace(buf[i]); i++)
1754                         ; /* do nothing */
1755                 return i;
1756         }
1757         return 0;
1758 }
1759
1760 static int section_name_is_ok(const char *name)
1761 {
1762         /* Empty section names are bogus. */
1763         if (!*name)
1764                 return 0;
1765
1766         /*
1767          * Before a dot, we must be alphanumeric or dash. After the first dot,
1768          * anything goes, so we can stop checking.
1769          */
1770         for (; *name && *name != '.'; name++)
1771                 if (*name != '-' && !isalnum(*name))
1772                         return 0;
1773         return 1;
1774 }
1775
1776 /* if new_name == NULL, the section is removed instead */
1777 int git_config_rename_section_in_file(const char *config_filename,
1778                                       const char *old_name, const char *new_name)
1779 {
1780         int ret = 0, remove = 0;
1781         char *filename_buf = NULL;
1782         struct lock_file *lock;
1783         int out_fd;
1784         char buf[1024];
1785         FILE *config_file;
1786
1787         if (new_name && !section_name_is_ok(new_name)) {
1788                 ret = error("invalid section name: %s", new_name);
1789                 goto out;
1790         }
1791
1792         if (!config_filename)
1793                 config_filename = filename_buf = git_pathdup("config");
1794
1795         lock = xcalloc(sizeof(struct lock_file), 1);
1796         out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1797         if (out_fd < 0) {
1798                 ret = error("could not lock config file %s", config_filename);
1799                 goto out;
1800         }
1801
1802         if (!(config_file = fopen(config_filename, "rb"))) {
1803                 /* no config file means nothing to rename, no error */
1804                 goto unlock_and_out;
1805         }
1806
1807         while (fgets(buf, sizeof(buf), config_file)) {
1808                 int i;
1809                 int length;
1810                 char *output = buf;
1811                 for (i = 0; buf[i] && isspace(buf[i]); i++)
1812                         ; /* do nothing */
1813                 if (buf[i] == '[') {
1814                         /* it's a section */
1815                         int offset = section_name_match(&buf[i], old_name);
1816                         if (offset > 0) {
1817                                 ret++;
1818                                 if (new_name == NULL) {
1819                                         remove = 1;
1820                                         continue;
1821                                 }
1822                                 store.baselen = strlen(new_name);
1823                                 if (!store_write_section(out_fd, new_name)) {
1824                                         ret = write_error(lock->filename);
1825                                         goto out;
1826                                 }
1827                                 /*
1828                                  * We wrote out the new section, with
1829                                  * a newline, now skip the old
1830                                  * section's length
1831                                  */
1832                                 output += offset + i;
1833                                 if (strlen(output) > 0) {
1834                                         /*
1835                                          * More content means there's
1836                                          * a declaration to put on the
1837                                          * next line; indent with a
1838                                          * tab
1839                                          */
1840                                         output -= 1;
1841                                         output[0] = '\t';
1842                                 }
1843                         }
1844                         remove = 0;
1845                 }
1846                 if (remove)
1847                         continue;
1848                 length = strlen(output);
1849                 if (write_in_full(out_fd, output, length) != length) {
1850                         ret = write_error(lock->filename);
1851                         goto out;
1852                 }
1853         }
1854         fclose(config_file);
1855 unlock_and_out:
1856         if (commit_lock_file(lock) < 0)
1857                 ret = error("could not commit config file %s", config_filename);
1858 out:
1859         free(filename_buf);
1860         return ret;
1861 }
1862
1863 int git_config_rename_section(const char *old_name, const char *new_name)
1864 {
1865         return git_config_rename_section_in_file(NULL, old_name, new_name);
1866 }
1867
1868 /*
1869  * Call this to report error for your variable that should not
1870  * get a boolean value (i.e. "[my] var" means "true").
1871  */
1872 #undef config_error_nonbool
1873 int config_error_nonbool(const char *var)
1874 {
1875         return error("Missing value for '%s'", var);
1876 }
1877
1878 int parse_config_key(const char *var,
1879                      const char *section,
1880                      const char **subsection, int *subsection_len,
1881                      const char **key)
1882 {
1883         int section_len = strlen(section);
1884         const char *dot;
1885
1886         /* Does it start with "section." ? */
1887         if (!starts_with(var, section) || var[section_len] != '.')
1888                 return -1;
1889
1890         /*
1891          * Find the key; we don't know yet if we have a subsection, but we must
1892          * parse backwards from the end, since the subsection may have dots in
1893          * it, too.
1894          */
1895         dot = strrchr(var, '.');
1896         *key = dot + 1;
1897
1898         /* Did we have a subsection at all? */
1899         if (dot == var + section_len) {
1900                 *subsection = NULL;
1901                 *subsection_len = 0;
1902         }
1903         else {
1904                 *subsection = var + section_len + 1;
1905                 *subsection_len = dot - *subsection;
1906         }
1907
1908         return 0;
1909 }