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 static void die_bad_number(const char *name, const char *value)
 560 {
 561         const char *reason = errno == ERANGE ?
 562                              "out of range" :
 563                              "invalid unit";
 564         if (!value)
 565                 value = "";
 566
 567         if (cf && cf->name)
 568                 die("bad numeric config value '%s' for '%s' in %s: %s",
 569                     value, name, cf->name, reason);
 570         die("bad numeric config value '%s' for '%s': %s", value, name, reason);
 571 }
 572
 573 int git_config_int(const char *name, const char *value)
 574 {
 575         int ret = 0;
 576         if (!git_parse_int(value, &ret))
 577                 die_bad_number(name, value);
 578         return ret;
 579 }
 580
 581 int64_t git_config_int64(const char *name, const char *value)
 582 {
 583         int64_t ret = 0;
 584         if (!git_parse_int64(value, &ret))
 585                 die_bad_number(name, value);
 586         return ret;
 587 }
 588
 589 unsigned long git_config_ulong(const char *name, const char *value)
 590 {
 591         unsigned long ret;
 592         if (!git_parse_ulong(value, &ret))
 593                 die_bad_number(name, value);
 594         return ret;
 595 }
 596
 597 static int git_config_maybe_bool_text(const char *name, const char *value)
 598 {
 599         if (!value)
 600                 return 1;
 601         if (!*value)
 602                 return 0;
 603         if (!strcasecmp(value, "true")
 604             || !strcasecmp(value, "yes")
 605             || !strcasecmp(value, "on"))
 606                 return 1;
 607         if (!strcasecmp(value, "false")
 608             || !strcasecmp(value, "no")
 609             || !strcasecmp(value, "off"))
 610                 return 0;
 611         return -1;
 612 }
 613
 614 int git_config_maybe_bool(const char *name, const char *value)
 615 {
 616         int v = git_config_maybe_bool_text(name, value);
 617         if (0 <= v)
 618                 return v;
 619         if (git_parse_int(value, &v))
 620                 return !!v;
 621         return -1;
 622 }
 623
 624 int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 625 {
 626         int v = git_config_maybe_bool_text(name, value);
 627         if (0 <= v) {
 628                 *is_bool = 1;
 629                 return v;
 630         }
 631         *is_bool = 0;
 632         return git_config_int(name, value);
 633 }
 634
 635 int git_config_bool(const char *name, const char *value)
 636 {
 637         int discard;
 638         return !!git_config_bool_or_int(name, value, &discard);
 639 }
 640
 641 int git_config_string(const char **dest, const char *var, const char *value)
 642 {
 643         if (!value)
 644                 return config_error_nonbool(var);
 645         *dest = xstrdup(value);
 646         return 0;
 647 }
 648
 649 int git_config_pathname(const char **dest, const char *var, const char *value)
 650 {
 651         if (!value)
 652                 return config_error_nonbool(var);
 653         *dest = expand_user_path(value);
 654         if (!*dest)
 655                 die("Failed to expand user dir in: '%s'", value);
 656         return 0;
 657 }
 658
 659 static int git_default_core_config(const char *var, const char *value)
 660 {
 661         /* This needs a better name */
 662         if (!strcmp(var, "core.filemode")) {
 663                 trust_executable_bit = git_config_bool(var, value);
 664                 return 0;
 665         }
 666         if (!strcmp(var, "core.trustctime")) {
 667                 trust_ctime = git_config_bool(var, value);
 668                 return 0;
 669         }
 670         if (!strcmp(var, "core.statinfo") ||
 671             !strcmp(var, "core.checkstat")) {
 672                 /*
 673                  * NEEDSWORK: statinfo was a typo in v1.8.2 that has
 674                  * never been advertised.  we will remove it at Git
 675                  * 2.0 boundary.
 676                  */
 677                 if (!strcmp(var, "core.statinfo")) {
 678                         static int warned;
 679                         if (!warned++) {
 680                                 warning("'core.statinfo' will be removed in Git 2.0; "
 681                                         "use 'core.checkstat' instead.");
 682                         }
 683                 }
 684                 if (!strcasecmp(value, "default"))
 685                         check_stat = 1;
 686                 else if (!strcasecmp(value, "minimal"))
 687                         check_stat = 0;
 688         }
 689
 690         if (!strcmp(var, "core.quotepath")) {
 691                 quote_path_fully = git_config_bool(var, value);
 692                 return 0;
 693         }
 694
 695         if (!strcmp(var, "core.symlinks")) {
 696                 has_symlinks = git_config_bool(var, value);
 697                 return 0;
 698         }
 699
 700         if (!strcmp(var, "core.ignorecase")) {
 701                 ignore_case = git_config_bool(var, value);
 702                 return 0;
 703         }
 704
 705         if (!strcmp(var, "core.attributesfile"))
 706                 return git_config_pathname(&git_attributes_file, var, value);
 707
 708         if (!strcmp(var, "core.bare")) {
 709                 is_bare_repository_cfg = git_config_bool(var, value);
 710                 return 0;
 711         }
 712
 713         if (!strcmp(var, "core.ignorestat")) {
 714                 assume_unchanged = git_config_bool(var, value);
 715                 return 0;
 716         }
 717
 718         if (!strcmp(var, "core.prefersymlinkrefs")) {
 719                 prefer_symlink_refs = git_config_bool(var, value);
 720                 return 0;
 721         }
 722
 723         if (!strcmp(var, "core.logallrefupdates")) {
 724                 log_all_ref_updates = git_config_bool(var, value);
 725                 return 0;
 726         }
 727
 728         if (!strcmp(var, "core.warnambiguousrefs")) {
 729                 warn_ambiguous_refs = git_config_bool(var, value);
 730                 return 0;
 731         }
 732
 733         if (!strcmp(var, "core.abbrev")) {
 734                 int abbrev = git_config_int(var, value);
 735                 if (abbrev < minimum_abbrev || abbrev > 40)
 736                         return -1;
 737                 default_abbrev = abbrev;
 738                 return 0;
 739         }
 740
 741         if (!strcmp(var, "core.loosecompression")) {
 742                 int level = git_config_int(var, value);
 743                 if (level == -1)
 744                         level = Z_DEFAULT_COMPRESSION;
 745                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 746                         die("bad zlib compression level %d", level);
 747                 zlib_compression_level = level;
 748                 zlib_compression_seen = 1;
 749                 return 0;
 750         }
 751
 752         if (!strcmp(var, "core.compression")) {
 753                 int level = git_config_int(var, value);
 754                 if (level == -1)
 755                         level = Z_DEFAULT_COMPRESSION;
 756                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 757                         die("bad zlib compression level %d", level);
 758                 core_compression_level = level;
 759                 core_compression_seen = 1;
 760                 if (!zlib_compression_seen)
 761                         zlib_compression_level = level;
 762                 return 0;
 763         }
 764
 765         if (!strcmp(var, "core.packedgitwindowsize")) {
 766                 int pgsz_x2 = getpagesize() * 2;
 767                 packed_git_window_size = git_config_ulong(var, value);
 768
 769                 /* This value must be multiple of (pagesize * 2) */
 770                 packed_git_window_size /= pgsz_x2;
 771                 if (packed_git_window_size < 1)
 772                         packed_git_window_size = 1;
 773                 packed_git_window_size *= pgsz_x2;
 774                 return 0;
 775         }
 776
 777         if (!strcmp(var, "core.bigfilethreshold")) {
 778                 big_file_threshold = git_config_ulong(var, value);
 779                 return 0;
 780         }
 781
 782         if (!strcmp(var, "core.packedgitlimit")) {
 783                 packed_git_limit = git_config_ulong(var, value);
 784                 return 0;
 785         }
 786
 787         if (!strcmp(var, "core.deltabasecachelimit")) {
 788                 delta_base_cache_limit = git_config_ulong(var, value);
 789                 return 0;
 790         }
 791
 792         if (!strcmp(var, "core.autocrlf")) {
 793                 if (value && !strcasecmp(value, "input")) {
 794                         if (core_eol == EOL_CRLF)
 795                                 return error("core.autocrlf=input conflicts with core.eol=crlf");
 796                         auto_crlf = AUTO_CRLF_INPUT;
 797                         return 0;
 798                 }
 799                 auto_crlf = git_config_bool(var, value);
 800                 return 0;
 801         }
 802
 803         if (!strcmp(var, "core.safecrlf")) {
 804                 if (value && !strcasecmp(value, "warn")) {
 805                         safe_crlf = SAFE_CRLF_WARN;
 806                         return 0;
 807                 }
 808                 safe_crlf = git_config_bool(var, value);
 809                 return 0;
 810         }
 811
 812         if (!strcmp(var, "core.eol")) {
 813                 if (value && !strcasecmp(value, "lf"))
 814                         core_eol = EOL_LF;
 815                 else if (value && !strcasecmp(value, "crlf"))
 816                         core_eol = EOL_CRLF;
 817                 else if (value && !strcasecmp(value, "native"))
 818                         core_eol = EOL_NATIVE;
 819                 else
 820                         core_eol = EOL_UNSET;
 821                 if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 822                         return error("core.autocrlf=input conflicts with core.eol=crlf");
 823                 return 0;
 824         }
 825
 826         if (!strcmp(var, "core.notesref")) {
 827                 notes_ref_name = xstrdup(value);
 828                 return 0;
 829         }
 830
 831         if (!strcmp(var, "core.pager"))
 832                 return git_config_string(&pager_program, var, value);
 833
 834         if (!strcmp(var, "core.editor"))
 835                 return git_config_string(&editor_program, var, value);
 836
 837         if (!strcmp(var, "core.commentchar")) {
 838                 const char *comment;
 839                 int ret = git_config_string(&comment, var, value);
 840                 if (!ret)
 841                         comment_line_char = comment[0];
 842                 return ret;
 843         }
 844
 845         if (!strcmp(var, "core.askpass"))
 846                 return git_config_string(&askpass_program, var, value);
 847
 848         if (!strcmp(var, "core.excludesfile"))
 849                 return git_config_pathname(&excludes_file, var, value);
 850
 851         if (!strcmp(var, "core.whitespace")) {
 852                 if (!value)
 853                         return config_error_nonbool(var);
 854                 whitespace_rule_cfg = parse_whitespace_rule(value);
 855                 return 0;
 856         }
 857
 858         if (!strcmp(var, "core.fsyncobjectfiles")) {
 859                 fsync_object_files = git_config_bool(var, value);
 860                 return 0;
 861         }
 862
 863         if (!strcmp(var, "core.preloadindex")) {
 864                 core_preload_index = git_config_bool(var, value);
 865                 return 0;
 866         }
 867
 868         if (!strcmp(var, "core.createobject")) {
 869                 if (!strcmp(value, "rename"))
 870                         object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 871                 else if (!strcmp(value, "link"))
 872                         object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 873                 else
 874                         die("Invalid mode for object creation: %s", value);
 875                 return 0;
 876         }
 877
 878         if (!strcmp(var, "core.sparsecheckout")) {
 879                 core_apply_sparse_checkout = git_config_bool(var, value);
 880                 return 0;
 881         }
 882
 883         if (!strcmp(var, "core.precomposeunicode")) {
 884                 precomposed_unicode = git_config_bool(var, value);
 885                 return 0;
 886         }
 887
 888         if (!strcmp(var, "core.hidedotfiles")) {
 889                 if (value && !strcasecmp(value, "dotgitonly")) {
 890                         hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
 891                         return 0;
 892                 }
 893                 hide_dotfiles = git_config_bool(var, value);
 894                 return 0;
 895         }
 896
 897         if (!strcmp(var, "core.fscache")) {
 898                 core_fscache = git_config_bool(var, value);
 899                 return 0;
 900         }
 901
 902         /* Add other config variables here and to Documentation/config.txt. */
 903         return 0;
 904 }
 905
 906 static int git_default_i18n_config(const char *var, const char *value)
 907 {
 908         if (!strcmp(var, "i18n.commitencoding"))
 909                 return git_config_string(&git_commit_encoding, var, value);
 910
 911         if (!strcmp(var, "i18n.logoutputencoding"))
 912                 return git_config_string(&git_log_output_encoding, var, value);
 913
 914         /* Add other config variables here and to Documentation/config.txt. */
 915         return 0;
 916 }
 917
 918 static int git_default_branch_config(const char *var, const char *value)
 919 {
 920         if (!strcmp(var, "branch.autosetupmerge")) {
 921                 if (value && !strcasecmp(value, "always")) {
 922                         git_branch_track = BRANCH_TRACK_ALWAYS;
 923                         return 0;
 924                 }
 925                 git_branch_track = git_config_bool(var, value);
 926                 return 0;
 927         }
 928         if (!strcmp(var, "branch.autosetuprebase")) {
 929                 if (!value)
 930                         return config_error_nonbool(var);
 931                 else if (!strcmp(value, "never"))
 932                         autorebase = AUTOREBASE_NEVER;
 933                 else if (!strcmp(value, "local"))
 934                         autorebase = AUTOREBASE_LOCAL;
 935                 else if (!strcmp(value, "remote"))
 936                         autorebase = AUTOREBASE_REMOTE;
 937                 else if (!strcmp(value, "always"))
 938                         autorebase = AUTOREBASE_ALWAYS;
 939                 else
 940                         return error("Malformed value for %s", var);
 941                 return 0;
 942         }
 943
 944         /* Add other config variables here and to Documentation/config.txt. */
 945         return 0;
 946 }
 947
 948 static int git_default_push_config(const char *var, const char *value)
 949 {
 950         if (!strcmp(var, "push.default")) {
 951                 if (!value)
 952                         return config_error_nonbool(var);
 953                 else if (!strcmp(value, "nothing"))
 954                         push_default = PUSH_DEFAULT_NOTHING;
 955                 else if (!strcmp(value, "matching"))
 956                         push_default = PUSH_DEFAULT_MATCHING;
 957                 else if (!strcmp(value, "simple"))
 958                         push_default = PUSH_DEFAULT_SIMPLE;
 959                 else if (!strcmp(value, "upstream"))
 960                         push_default = PUSH_DEFAULT_UPSTREAM;
 961                 else if (!strcmp(value, "tracking")) /* deprecated */
 962                         push_default = PUSH_DEFAULT_UPSTREAM;
 963                 else if (!strcmp(value, "current"))
 964                         push_default = PUSH_DEFAULT_CURRENT;
 965                 else {
 966                         error("Malformed value for %s: %s", var, value);
 967                         return error("Must be one of nothing, matching, simple, "
 968                                      "upstream or current.");
 969                 }
 970                 return 0;
 971         }
 972
 973         /* Add other config variables here and to Documentation/config.txt. */
 974         return 0;
 975 }
 976
 977 static int git_default_mailmap_config(const char *var, const char *value)
 978 {
 979         if (!strcmp(var, "mailmap.file"))
 980                 return git_config_string(&git_mailmap_file, var, value);
 981         if (!strcmp(var, "mailmap.blob"))
 982                 return git_config_string(&git_mailmap_blob, var, value);
 983
 984         /* Add other config variables here and to Documentation/config.txt. */
 985         return 0;
 986 }
 987
 988 int git_default_config(const char *var, const char *value, void *dummy)
 989 {
 990         if (starts_with(var, "core."))
 991                 return git_default_core_config(var, value);
 992
 993         if (starts_with(var, "user."))
 994                 return git_ident_config(var, value, dummy);
 995
 996         if (starts_with(var, "i18n."))
 997                 return git_default_i18n_config(var, value);
 998
 999         if (starts_with(var, "branch."))
1000                 return git_default_branch_config(var, value);
1001
1002         if (starts_with(var, "push."))
1003                 return git_default_push_config(var, value);
1004
1005         if (starts_with(var, "mailmap."))
1006                 return git_default_mailmap_config(var, value);
1007
1008         if (starts_with(var, "advice."))
1009                 return git_default_advice_config(var, value);
1010
1011         if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
1012                 pager_use_color = git_config_bool(var,value);
1013                 return 0;
1014         }
1015
1016         if (!strcmp(var, "pack.packsizelimit")) {
1017                 pack_size_limit_cfg = git_config_ulong(var, value);
1018                 return 0;
1019         }
1020         /* Add other config variables here and to Documentation/config.txt. */
1021         return 0;
1022 }
1023
1024 /*
1025  * All source specific fields in the union, die_on_error, name and the callbacks
1026  * fgetc, ungetc, ftell of top need to be initialized before calling
1027  * this function.
1028  */
1029 static int do_config_from(struct config_source *top, config_fn_t fn, void *data)
1030 {
1031         int ret;
1032
1033         /* push config-file parsing state stack */
1034         top->prev = cf;
1035         top->linenr = 1;
1036         top->eof = 0;
1037         strbuf_init(&top->value, 1024);
1038         strbuf_init(&top->var, 1024);
1039         cf = top;
1040
1041         ret = git_parse_source(fn, data);
1042
1043         /* pop config-file parsing state stack */
1044         strbuf_release(&top->value);
1045         strbuf_release(&top->var);
1046         cf = top->prev;
1047
1048         return ret;
1049 }
1050
1051 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
1052 {
1053         int ret;
1054         FILE *f = fopen(filename, "r");
1055
1056         ret = -1;
1057         if (f) {
1058                 struct config_source top;
1059
1060                 top.u.file = f;
1061                 top.name = filename;
1062                 top.die_on_error = 1;
1063                 top.do_fgetc = config_file_fgetc;
1064                 top.do_ungetc = config_file_ungetc;
1065                 top.do_ftell = config_file_ftell;
1066
1067                 ret = do_config_from(&top, fn, data);
1068
1069                 fclose(f);
1070         }
1071         return ret;
1072 }
1073
1074 int git_config_from_buf(config_fn_t fn, const char *name, const char *buf,
1075                         size_t len, void *data)
1076 {
1077         struct config_source top;
1078
1079         top.u.buf.buf = buf;
1080         top.u.buf.len = len;
1081         top.u.buf.pos = 0;
1082         top.name = name;
1083         top.die_on_error = 0;
1084         top.do_fgetc = config_buf_fgetc;
1085         top.do_ungetc = config_buf_ungetc;
1086         top.do_ftell = config_buf_ftell;
1087
1088         return do_config_from(&top, fn, data);
1089 }
1090
1091 static int git_config_from_blob_sha1(config_fn_t fn,
1092                                      const char *name,
1093                                      const unsigned char *sha1,
1094                                      void *data)
1095 {
1096         enum object_type type;
1097         char *buf;
1098         unsigned long size;
1099         int ret;
1100
1101         buf = read_sha1_file(sha1, &type, &size);
1102         if (!buf)
1103                 return error("unable to load config blob object '%s'", name);
1104         if (type != OBJ_BLOB) {
1105                 free(buf);
1106                 return error("reference '%s' does not point to a blob", name);
1107         }
1108
1109         ret = git_config_from_buf(fn, name, buf, size, data);
1110         free(buf);
1111
1112         return ret;
1113 }
1114
1115 static int git_config_from_blob_ref(config_fn_t fn,
1116                                     const char *name,
1117                                     void *data)
1118 {
1119         unsigned char sha1[20];
1120
1121         if (get_sha1(name, sha1) < 0)
1122                 return error("unable to resolve config blob '%s'", name);
1123         return git_config_from_blob_sha1(fn, name, sha1, data);
1124 }
1125
1126 const char *git_etc_gitconfig(void)
1127 {
1128         static const char *system_wide;
1129         if (!system_wide)
1130                 system_wide = system_path(ETC_GITCONFIG);
1131         return system_wide;
1132 }
1133
1134 int git_env_bool(const char *k, int def)
1135 {
1136         const char *v = getenv(k);
1137         return v ? git_config_bool(k, v) : def;
1138 }
1139
1140 int git_config_system(void)
1141 {
1142         return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
1143 }
1144
1145 int git_config_early(config_fn_t fn, void *data, const char *repo_config)
1146 {
1147         int ret = 0, found = 0;
1148         char *xdg_config = NULL;
1149         char *user_config = NULL;
1150
1151         home_config_paths(&user_config, &xdg_config, "config");
1152
1153         if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0)) {
1154                 ret += git_config_from_file(fn, git_etc_gitconfig(),
1155                                             data);
1156                 found += 1;
1157         }
1158
1159         if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK)) {
1160                 ret += git_config_from_file(fn, xdg_config, data);
1161                 found += 1;
1162         }
1163
1164         if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK)) {
1165                 ret += git_config_from_file(fn, user_config, data);
1166                 found += 1;
1167         }
1168
1169         if (repo_config && !access_or_die(repo_config, R_OK, 0)) {
1170                 ret += git_config_from_file(fn, repo_config, data);
1171                 found += 1;
1172         }
1173
1174         switch (git_config_from_parameters(fn, data)) {
1175         case -1: /* error */
1176                 die("unable to parse command-line config");
1177                 break;
1178         case 0: /* found nothing */
1179                 break;
1180         default: /* found at least one item */
1181                 found++;
1182                 break;
1183         }
1184
1185         free(xdg_config);
1186         free(user_config);
1187         return ret == 0 ? found : ret;
1188 }
1189
1190 int git_config_with_options(config_fn_t fn, void *data,
1191                             const char *filename,
1192                             const char *blob_ref,
1193                             int respect_includes)
1194 {
1195         char *repo_config = NULL;
1196         int ret;
1197         struct config_include_data inc = CONFIG_INCLUDE_INIT;
1198
1199         if (respect_includes) {
1200                 inc.fn = fn;
1201                 inc.data = data;
1202                 fn = git_config_include;
1203                 data = &inc;
1204         }
1205
1206         /*
1207          * If we have a specific filename, use it. Otherwise, follow the
1208          * regular lookup sequence.
1209          */
1210         if (filename)
1211                 return git_config_from_file(fn, filename, data);
1212         else if (blob_ref)
1213                 return git_config_from_blob_ref(fn, blob_ref, data);
1214
1215         repo_config = git_pathdup("config");
1216         ret = git_config_early(fn, data, repo_config);
1217         if (repo_config)
1218                 free(repo_config);
1219         return ret;
1220 }
1221
1222 int git_config(config_fn_t fn, void *data)
1223 {
1224         return git_config_with_options(fn, data, NULL, NULL, 1);
1225 }
1226
1227 /*
1228  * Find all the stuff for git_config_set() below.
1229  */
1230
1231 static struct {
1232         int baselen;
1233         char *key;
1234         int do_not_match;
1235         regex_t *value_regex;
1236         int multi_replace;
1237         size_t *offset;
1238         unsigned int offset_alloc;
1239         enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1240         int seen;
1241 } store;
1242
1243 static int matches(const char *key, const char *value)
1244 {
1245         return !strcmp(key, store.key) &&
1246                 (store.value_regex == NULL ||
1247                  (store.do_not_match ^
1248                   !regexec(store.value_regex, value, 0, NULL, 0)));
1249 }
1250
1251 static int store_aux(const char *key, const char *value, void *cb)
1252 {
1253         const char *ep;
1254         size_t section_len;
1255
1256         switch (store.state) {
1257         case KEY_SEEN:
1258                 if (matches(key, value)) {
1259                         if (store.seen == 1 && store.multi_replace == 0) {
1260                                 warning("%s has multiple values", key);
1261                         }
1262
1263                         ALLOC_GROW(store.offset, store.seen + 1,
1264                                    store.offset_alloc);
1265
1266                         store.offset[store.seen] = cf->do_ftell(cf);
1267                         store.seen++;
1268                 }
1269                 break;
1270         case SECTION_SEEN:
1271                 /*
1272                  * What we are looking for is in store.key (both
1273                  * section and var), and its section part is baselen
1274                  * long.  We found key (again, both section and var).
1275                  * We would want to know if this key is in the same
1276                  * section as what we are looking for.  We already
1277                  * know we are in the same section as what should
1278                  * hold store.key.
1279                  */
1280                 ep = strrchr(key, '.');
1281                 section_len = ep - key;
1282
1283                 if ((section_len != store.baselen) ||
1284                     memcmp(key, store.key, section_len+1)) {
1285                         store.state = SECTION_END_SEEN;
1286                         break;
1287                 }
1288
1289                 /*
1290                  * Do not increment matches: this is no match, but we
1291                  * just made sure we are in the desired section.
1292                  */
1293                 ALLOC_GROW(store.offset, store.seen + 1,
1294                            store.offset_alloc);
1295                 store.offset[store.seen] = cf->do_ftell(cf);
1296                 /* fallthru */
1297         case SECTION_END_SEEN:
1298         case START:
1299                 if (matches(key, value)) {
1300                         ALLOC_GROW(store.offset, store.seen + 1,
1301                                    store.offset_alloc);
1302                         store.offset[store.seen] = cf->do_ftell(cf);
1303                         store.state = KEY_SEEN;
1304                         store.seen++;
1305                 } else {
1306                         if (strrchr(key, '.') - key == store.baselen &&
1307                               !strncmp(key, store.key, store.baselen)) {
1308                                         store.state = SECTION_SEEN;
1309                                         ALLOC_GROW(store.offset,
1310                                                    store.seen + 1,
1311                                                    store.offset_alloc);
1312                                         store.offset[store.seen] = cf->do_ftell(cf);
1313                         }
1314                 }
1315         }
1316         return 0;
1317 }
1318
1319 static int write_error(const char *filename)
1320 {
1321         error("failed to write new configuration file %s", filename);
1322
1323         /* Same error code as "failed to rename". */
1324         return 4;
1325 }
1326
1327 static int store_write_section(int fd, const char *key)
1328 {
1329         const char *dot;
1330         int i, success;
1331         struct strbuf sb = STRBUF_INIT;
1332
1333         dot = memchr(key, '.', store.baselen);
1334         if (dot) {
1335                 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1336                 for (i = dot - key + 1; i < store.baselen; i++) {
1337                         if (key[i] == '"' || key[i] == '\\')
1338                                 strbuf_addch(&sb, '\\');
1339                         strbuf_addch(&sb, key[i]);
1340                 }
1341                 strbuf_addstr(&sb, "\"]\n");
1342         } else {
1343                 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1344         }
1345
1346         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1347         strbuf_release(&sb);
1348
1349         return success;
1350 }
1351
1352 static int store_write_pair(int fd, const char *key, const char *value)
1353 {
1354         int i, success;
1355         int length = strlen(key + store.baselen + 1);
1356         const char *quote = "";
1357         struct strbuf sb = STRBUF_INIT;
1358
1359         /*
1360          * Check to see if the value needs to be surrounded with a dq pair.
1361          * Note that problematic characters are always backslash-quoted; this
1362          * check is about not losing leading or trailing SP and strings that
1363          * follow beginning-of-comment characters (i.e. ';' and '#') by the
1364          * configuration parser.
1365          */
1366         if (value[0] == ' ')
1367                 quote = "\"";
1368         for (i = 0; value[i]; i++)
1369                 if (value[i] == ';' || value[i] == '#')
1370                         quote = "\"";
1371         if (i && value[i - 1] == ' ')
1372                 quote = "\"";
1373
1374         strbuf_addf(&sb, "\t%.*s = %s",
1375                     length, key + store.baselen + 1, quote);
1376
1377         for (i = 0; value[i]; i++)
1378                 switch (value[i]) {
1379                 case '\n':
1380                         strbuf_addstr(&sb, "\\n");
1381                         break;
1382                 case '\t':
1383                         strbuf_addstr(&sb, "\\t");
1384                         break;
1385                 case '"':
1386                 case '\\':
1387                         strbuf_addch(&sb, '\\');
1388                 default:
1389                         strbuf_addch(&sb, value[i]);
1390                         break;
1391                 }
1392         strbuf_addf(&sb, "%s\n", quote);
1393
1394         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1395         strbuf_release(&sb);
1396
1397         return success;
1398 }
1399
1400 static ssize_t find_beginning_of_line(const char *contents, size_t size,
1401         size_t offset_, int *found_bracket)
1402 {
1403         size_t equal_offset = size, bracket_offset = size;
1404         ssize_t offset;
1405
1406 contline:
1407         for (offset = offset_-2; offset > 0
1408                         && contents[offset] != '\n'; offset--)
1409                 switch (contents[offset]) {
1410                         case '=': equal_offset = offset; break;
1411                         case ']': bracket_offset = offset; break;
1412                 }
1413         if (offset > 0 && contents[offset-1] == '\\') {
1414                 offset_ = offset;
1415                 goto contline;
1416         }
1417         if (bracket_offset < equal_offset) {
1418                 *found_bracket = 1;
1419                 offset = bracket_offset+1;
1420         } else
1421                 offset++;
1422
1423         return offset;
1424 }
1425
1426 int git_config_set_in_file(const char *config_filename,
1427                         const char *key, const char *value)
1428 {
1429         return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1430 }
1431
1432 int git_config_set(const char *key, const char *value)
1433 {
1434         return git_config_set_multivar(key, value, NULL, 0);
1435 }
1436
1437 /*
1438  * Auxiliary function to sanity-check and split the key into the section
1439  * identifier and variable name.
1440  *
1441  * Returns 0 on success, -1 when there is an invalid character in the key and
1442  * -2 if there is no section name in the key.
1443  *
1444  * store_key - pointer to char* which will hold a copy of the key with
1445  *             lowercase section and variable name
1446  * baselen - pointer to int which will hold the length of the
1447  *           section + subsection part, can be NULL
1448  */
1449 int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1450 {
1451         int i, dot, baselen;
1452         const char *last_dot = strrchr(key, '.');
1453
1454         /*
1455          * Since "key" actually contains the section name and the real
1456          * key name separated by a dot, we have to know where the dot is.
1457          */
1458
1459         if (last_dot == NULL || last_dot == key) {
1460                 error("key does not contain a section: %s", key);
1461                 return -CONFIG_NO_SECTION_OR_NAME;
1462         }
1463
1464         if (!last_dot[1]) {
1465                 error("key does not contain variable name: %s", key);
1466                 return -CONFIG_NO_SECTION_OR_NAME;
1467         }
1468
1469         baselen = last_dot - key;
1470         if (baselen_)
1471                 *baselen_ = baselen;
1472
1473         /*
1474          * Validate the key and while at it, lower case it for matching.
1475          */
1476         *store_key = xmalloc(strlen(key) + 1);
1477
1478         dot = 0;
1479         for (i = 0; key[i]; i++) {
1480                 unsigned char c = key[i];
1481                 if (c == '.')
1482                         dot = 1;
1483                 /* Leave the extended basename untouched.. */
1484                 if (!dot || i > baselen) {
1485                         if (!iskeychar(c) ||
1486                             (i == baselen + 1 && !isalpha(c))) {
1487                                 error("invalid key: %s", key);
1488                                 goto out_free_ret_1;
1489                         }
1490                         c = tolower(c);
1491                 } else if (c == '\n') {
1492                         error("invalid key (newline): %s", key);
1493                         goto out_free_ret_1;
1494                 }
1495                 (*store_key)[i] = c;
1496         }
1497         (*store_key)[i] = 0;
1498
1499         return 0;
1500
1501 out_free_ret_1:
1502         free(*store_key);
1503         *store_key = NULL;
1504         return -CONFIG_INVALID_KEY;
1505 }
1506
1507 /*
1508  * If value==NULL, unset in (remove from) config,
1509  * if value_regex!=NULL, disregard key/value pairs where value does not match.
1510  * if multi_replace==0, nothing, or only one matching key/value is replaced,
1511  *     else all matching key/values (regardless how many) are removed,
1512  *     before the new pair is written.
1513  *
1514  * Returns 0 on success.
1515  *
1516  * This function does this:
1517  *
1518  * - it locks the config file by creating ".git/config.lock"
1519  *
1520  * - it then parses the config using store_aux() as validator to find
1521  *   the position on the key/value pair to replace. If it is to be unset,
1522  *   it must be found exactly once.
1523  *
1524  * - the config file is mmap()ed and the part before the match (if any) is
1525  *   written to the lock file, then the changed part and the rest.
1526  *
1527  * - the config file is removed and the lock file rename()d to it.
1528  *
1529  */
1530 int git_config_set_multivar_in_file(const char *config_filename,
1531                                 const char *key, const char *value,
1532                                 const char *value_regex, int multi_replace)
1533 {
1534         int fd = -1, in_fd;
1535         int ret;
1536         struct lock_file *lock = NULL;
1537         char *filename_buf = NULL;
1538
1539         /* parse-key returns negative; flip the sign to feed exit(3) */
1540         ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1541         if (ret)
1542                 goto out_free;
1543
1544         store.multi_replace = multi_replace;
1545
1546         if (!config_filename)
1547                 config_filename = filename_buf = git_pathdup("config");
1548
1549         /*
1550          * The lock serves a purpose in addition to locking: the new
1551          * contents of .git/config will be written into it.
1552          */
1553         lock = xcalloc(sizeof(struct lock_file), 1);
1554         fd = hold_lock_file_for_update(lock, config_filename, 0);
1555         if (fd < 0) {
1556                 error("could not lock config file %s: %s", config_filename, strerror(errno));
1557                 free(store.key);
1558                 ret = CONFIG_NO_LOCK;
1559                 goto out_free;
1560         }
1561
1562         /*
1563          * If .git/config does not exist yet, write a minimal version.
1564          */
1565         in_fd = open(config_filename, O_RDONLY);
1566         if ( in_fd < 0 ) {
1567                 free(store.key);
1568
1569                 if ( ENOENT != errno ) {
1570                         error("opening %s: %s", config_filename,
1571                               strerror(errno));
1572                         ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1573                         goto out_free;
1574                 }
1575                 /* if nothing to unset, error out */
1576                 if (value == NULL) {
1577                         ret = CONFIG_NOTHING_SET;
1578                         goto out_free;
1579                 }
1580
1581                 store.key = (char *)key;
1582                 if (!store_write_section(fd, key) ||
1583                     !store_write_pair(fd, key, value))
1584                         goto write_err_out;
1585         } else {
1586                 struct stat st;
1587                 char *contents;
1588                 size_t contents_sz, copy_begin, copy_end;
1589                 int i, new_line = 0;
1590
1591                 if (value_regex == NULL)
1592                         store.value_regex = NULL;
1593                 else {
1594                         if (value_regex[0] == '!') {
1595                                 store.do_not_match = 1;
1596                                 value_regex++;
1597                         } else
1598                                 store.do_not_match = 0;
1599
1600                         store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1601                         if (regcomp(store.value_regex, value_regex,
1602                                         REG_EXTENDED)) {
1603                                 error("invalid pattern: %s", value_regex);
1604                                 free(store.value_regex);
1605                                 ret = CONFIG_INVALID_PATTERN;
1606                                 goto out_free;
1607                         }
1608                 }
1609
1610                 ALLOC_GROW(store.offset, 1, store.offset_alloc);
1611                 store.offset[0] = 0;
1612                 store.state = START;
1613                 store.seen = 0;
1614
1615                 /*
1616                  * After this, store.offset will contain the *end* offset
1617                  * of the last match, or remain at 0 if no match was found.
1618                  * As a side effect, we make sure to transform only a valid
1619                  * existing config file.
1620                  */
1621                 if (git_config_from_file(store_aux, config_filename, NULL)) {
1622                         error("invalid config file %s", config_filename);
1623                         free(store.key);
1624                         if (store.value_regex != NULL) {
1625                                 regfree(store.value_regex);
1626                                 free(store.value_regex);
1627                         }
1628                         ret = CONFIG_INVALID_FILE;
1629                         goto out_free;
1630                 }
1631
1632                 free(store.key);
1633                 if (store.value_regex != NULL) {
1634                         regfree(store.value_regex);
1635                         free(store.value_regex);
1636                 }
1637
1638                 /* if nothing to unset, or too many matches, error out */
1639                 if ((store.seen == 0 && value == NULL) ||
1640                                 (store.seen > 1 && multi_replace == 0)) {
1641                         ret = CONFIG_NOTHING_SET;
1642                         goto out_free;
1643                 }
1644
1645                 fstat(in_fd, &st);
1646                 contents_sz = xsize_t(st.st_size);
1647                 contents = xmmap(NULL, contents_sz, PROT_READ,
1648                         MAP_PRIVATE, in_fd, 0);
1649                 close(in_fd);
1650
1651                 if (store.seen == 0)
1652                         store.seen = 1;
1653
1654                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1655                         if (store.offset[i] == 0) {
1656                                 store.offset[i] = copy_end = contents_sz;
1657                         } else if (store.state != KEY_SEEN) {
1658                                 copy_end = store.offset[i];
1659                         } else
1660                                 copy_end = find_beginning_of_line(
1661                                         contents, contents_sz,
1662                                         store.offset[i]-2, &new_line);
1663
1664                         if (copy_end > 0 && contents[copy_end-1] != '\n')
1665                                 new_line = 1;
1666
1667                         /* write the first part of the config */
1668                         if (copy_end > copy_begin) {
1669                                 if (write_in_full(fd, contents + copy_begin,
1670                                                   copy_end - copy_begin) <
1671                                     copy_end - copy_begin)
1672                                         goto write_err_out;
1673                                 if (new_line &&
1674                                     write_str_in_full(fd, "\n") != 1)
1675                                         goto write_err_out;
1676                         }
1677                         copy_begin = store.offset[i];
1678                 }
1679
1680                 /* write the pair (value == NULL means unset) */
1681                 if (value != NULL) {
1682                         if (store.state == START) {
1683                                 if (!store_write_section(fd, key))
1684                                         goto write_err_out;
1685                         }
1686                         if (!store_write_pair(fd, key, value))
1687                                 goto write_err_out;
1688                 }
1689
1690                 /* write the rest of the config */
1691                 if (copy_begin < contents_sz)
1692                         if (write_in_full(fd, contents + copy_begin,
1693                                           contents_sz - copy_begin) <
1694                             contents_sz - copy_begin)
1695                                 goto write_err_out;
1696
1697                 munmap(contents, contents_sz);
1698         }
1699
1700         if (commit_lock_file(lock) < 0) {
1701                 error("could not commit config file %s", config_filename);
1702                 ret = CONFIG_NO_WRITE;
1703                 goto out_free;
1704         }
1705
1706         /*
1707          * lock is committed, so don't try to roll it back below.
1708          * NOTE: Since lockfile.c keeps a linked list of all created
1709          * lock_file structures, it isn't safe to free(lock).  It's
1710          * better to just leave it hanging around.
1711          */
1712         lock = NULL;
1713         ret = 0;
1714
1715 out_free:
1716         if (lock)
1717                 rollback_lock_file(lock);
1718         free(filename_buf);
1719         return ret;
1720
1721 write_err_out:
1722         ret = write_error(lock->filename);
1723         goto out_free;
1724
1725 }
1726
1727 int git_config_set_multivar(const char *key, const char *value,
1728                         const char *value_regex, int multi_replace)
1729 {
1730         return git_config_set_multivar_in_file(NULL, key, value, value_regex,
1731                                                multi_replace);
1732 }
1733
1734 static int section_name_match (const char *buf, const char *name)
1735 {
1736         int i = 0, j = 0, dot = 0;
1737         if (buf[i] != '[')
1738                 return 0;
1739         for (i = 1; buf[i] && buf[i] != ']'; i++) {
1740                 if (!dot && isspace(buf[i])) {
1741                         dot = 1;
1742                         if (name[j++] != '.')
1743                                 break;
1744                         for (i++; isspace(buf[i]); i++)
1745                                 ; /* do nothing */
1746                         if (buf[i] != '"')
1747                                 break;
1748                         continue;
1749                 }
1750                 if (buf[i] == '\\' && dot)
1751                         i++;
1752                 else if (buf[i] == '"' && dot) {
1753                         for (i++; isspace(buf[i]); i++)
1754                                 ; /* do_nothing */
1755                         break;
1756                 }
1757                 if (buf[i] != name[j++])
1758                         break;
1759         }
1760         if (buf[i] == ']' && name[j] == 0) {
1761                 /*
1762                  * We match, now just find the right length offset by
1763                  * gobbling up any whitespace after it, as well
1764                  */
1765                 i++;
1766                 for (; buf[i] && isspace(buf[i]); i++)
1767                         ; /* do nothing */
1768                 return i;
1769         }
1770         return 0;
1771 }
1772
1773 static int section_name_is_ok(const char *name)
1774 {
1775         /* Empty section names are bogus. */
1776         if (!*name)
1777                 return 0;
1778
1779         /*
1780          * Before a dot, we must be alphanumeric or dash. After the first dot,
1781          * anything goes, so we can stop checking.
1782          */
1783         for (; *name && *name != '.'; name++)
1784                 if (*name != '-' && !isalnum(*name))
1785                         return 0;
1786         return 1;
1787 }
1788
1789 /* if new_name == NULL, the section is removed instead */
1790 int git_config_rename_section_in_file(const char *config_filename,
1791                                       const char *old_name, const char *new_name)
1792 {
1793         int ret = 0, remove = 0;
1794         char *filename_buf = NULL;
1795         struct lock_file *lock;
1796         int out_fd;
1797         char buf[1024];
1798         FILE *config_file;
1799
1800         if (new_name && !section_name_is_ok(new_name)) {
1801                 ret = error("invalid section name: %s", new_name);
1802                 goto out;
1803         }
1804
1805         if (!config_filename)
1806                 config_filename = filename_buf = git_pathdup("config");
1807
1808         lock = xcalloc(sizeof(struct lock_file), 1);
1809         out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1810         if (out_fd < 0) {
1811                 ret = error("could not lock config file %s", config_filename);
1812                 goto out;
1813         }
1814
1815         if (!(config_file = fopen(config_filename, "rb"))) {
1816                 /* no config file means nothing to rename, no error */
1817                 goto unlock_and_out;
1818         }
1819
1820         while (fgets(buf, sizeof(buf), config_file)) {
1821                 int i;
1822                 int length;
1823                 char *output = buf;
1824                 for (i = 0; buf[i] && isspace(buf[i]); i++)
1825                         ; /* do nothing */
1826                 if (buf[i] == '[') {
1827                         /* it's a section */
1828                         int offset = section_name_match(&buf[i], old_name);
1829                         if (offset > 0) {
1830                                 ret++;
1831                                 if (new_name == NULL) {
1832                                         remove = 1;
1833                                         continue;
1834                                 }
1835                                 store.baselen = strlen(new_name);
1836                                 if (!store_write_section(out_fd, new_name)) {
1837                                         ret = write_error(lock->filename);
1838                                         goto out;
1839                                 }
1840                                 /*
1841                                  * We wrote out the new section, with
1842                                  * a newline, now skip the old
1843                                  * section's length
1844                                  */
1845                                 output += offset + i;
1846                                 if (strlen(output) > 0) {
1847                                         /*
1848                                          * More content means there's
1849                                          * a declaration to put on the
1850                                          * next line; indent with a
1851                                          * tab
1852                                          */
1853                                         output -= 1;
1854                                         output[0] = '\t';
1855                                 }
1856                         }
1857                         remove = 0;
1858                 }
1859                 if (remove)
1860                         continue;
1861                 length = strlen(output);
1862                 if (write_in_full(out_fd, output, length) != length) {
1863                         ret = write_error(lock->filename);
1864                         goto out;
1865                 }
1866         }
1867         fclose(config_file);
1868 unlock_and_out:
1869         if (commit_lock_file(lock) < 0)
1870                 ret = error("could not commit config file %s", config_filename);
1871 out:
1872         free(filename_buf);
1873         return ret;
1874 }
1875
1876 int git_config_rename_section(const char *old_name, const char *new_name)
1877 {
1878         return git_config_rename_section_in_file(NULL, old_name, new_name);
1879 }
1880
1881 /*
1882  * Call this to report error for your variable that should not
1883  * get a boolean value (i.e. "[my] var" means "true").
1884  */
1885 #undef config_error_nonbool
1886 int config_error_nonbool(const char *var)
1887 {
1888         return error("Missing value for '%s'", var);
1889 }
1890
1891 int parse_config_key(const char *var,
1892                      const char *section,
1893                      const char **subsection, int *subsection_len,
1894                      const char **key)
1895 {
1896         int section_len = strlen(section);
1897         const char *dot;
1898
1899         /* Does it start with "section." ? */
1900         if (!starts_with(var, section) || var[section_len] != '.')
1901                 return -1;
1902
1903         /*
1904          * Find the key; we don't know yet if we have a subsection, but we must
1905          * parse backwards from the end, since the subsection may have dots in
1906          * it, too.
1907          */
1908         dot = strrchr(var, '.');
1909         *key = dot + 1;
1910
1911         /* Did we have a subsection at all? */
1912         if (dot == var + section_len) {
1913                 *subsection = NULL;
1914                 *subsection_len = 0;
1915         }
1916         else {
1917                 *subsection = var + section_len + 1;
1918                 *subsection_len = dot - *subsection;
1919         }
1920
1921         return 0;
1922 }