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 (*fgetc)(struct config_source *c);
  31         int (*ungetc)(int c, struct config_source *conf);
  32         long (*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 = expand_user_path(path);
  88
  89         if (!expanded)
  90                 return error("Could not expand include path '%s'", path);
  91         path = expanded;
  92
  93         /*
  94          * Use an absolute path as-is, but interpret relative paths
  95          * based on the including config file.
  96          */
  97         if (!is_absolute_path(path)) {
  98                 char *slash;
  99
 100                 if (!cf || !cf->name)
 101                         return error("relative config includes must come from files");
 102
 103                 slash = find_last_dir_sep(cf->name);
 104                 if (slash)
 105                         strbuf_add(&buf, cf->name, slash - cf->name + 1);
 106                 strbuf_addstr(&buf, path);
 107                 path = buf.buf;
 108         }
 109
 110         if (!access_or_die(path, R_OK, 0)) {
 111                 if (++inc->depth > MAX_INCLUDE_DEPTH)
 112                         die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
 113                             cf && cf->name ? cf->name : "the command line");
 114                 ret = git_config_from_file(git_config_include, path, inc);
 115                 inc->depth--;
 116         }
 117         strbuf_release(&buf);
 118         free(expanded);
 119         return ret;
 120 }
 121
 122 int git_config_include(const char *var, const char *value, void *data)
 123 {
 124         struct config_include_data *inc = data;
 125         const char *type;
 126         int ret;
 127
 128         /*
 129          * Pass along all values, including "include" directives; this makes it
 130          * possible to query information on the includes themselves.
 131          */
 132         ret = inc->fn(var, value, inc->data);
 133         if (ret < 0)
 134                 return ret;
 135
 136         type = skip_prefix(var, "include.");
 137         if (!type)
 138                 return ret;
 139
 140         if (!strcmp(type, "path"))
 141                 ret = handle_path_include(value, inc);
 142         return ret;
 143 }
 144
 145 static void lowercase(char *p)
 146 {
 147         for (; *p; p++)
 148                 *p = tolower(*p);
 149 }
 150
 151 void git_config_push_parameter(const char *text)
 152 {
 153         struct strbuf env = STRBUF_INIT;
 154         const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
 155         if (old) {
 156                 strbuf_addstr(&env, old);
 157                 strbuf_addch(&env, ' ');
 158         }
 159         sq_quote_buf(&env, text);
 160         setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
 161         strbuf_release(&env);
 162 }
 163
 164 int git_config_parse_parameter(const char *text,
 165                                config_fn_t fn, void *data)
 166 {
 167         struct strbuf **pair;
 168         pair = strbuf_split_str(text, '=', 2);
 169         if (!pair[0])
 170                 return error("bogus config parameter: %s", text);
 171         if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
 172                 strbuf_setlen(pair[0], pair[0]->len - 1);
 173         strbuf_trim(pair[0]);
 174         if (!pair[0]->len) {
 175                 strbuf_list_free(pair);
 176                 return error("bogus config parameter: %s", text);
 177         }
 178         lowercase(pair[0]->buf);
 179         if (fn(pair[0]->buf, pair[1] ? pair[1]->buf : NULL, data) < 0) {
 180                 strbuf_list_free(pair);
 181                 return -1;
 182         }
 183         strbuf_list_free(pair);
 184         return 0;
 185 }
 186
 187 int git_config_from_parameters(config_fn_t fn, void *data)
 188 {
 189         const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 190         char *envw;
 191         const char **argv = NULL;
 192         int nr = 0, alloc = 0;
 193         int i;
 194
 195         if (!env)
 196                 return 0;
 197         /* sq_dequote will write over it */
 198         envw = xstrdup(env);
 199
 200         if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 201                 free(envw);
 202                 return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
 203         }
 204
 205         for (i = 0; i < nr; i++) {
 206                 if (git_config_parse_parameter(argv[i], fn, data) < 0) {
 207                         free(argv);
 208                         free(envw);
 209                         return -1;
 210                 }
 211         }
 212
 213         free(argv);
 214         free(envw);
 215         return nr > 0;
 216 }
 217
 218 static int get_next_char(void)
 219 {
 220         int c = cf->fgetc(cf);
 221
 222         if (c == '\r') {
 223                 /* DOS like systems */
 224                 c = cf->fgetc(cf);
 225                 if (c != '\n') {
 226                         cf->ungetc(c, cf);
 227                         c = '\r';
 228                 }
 229         }
 230         if (c == '\n')
 231                 cf->linenr++;
 232         if (c == EOF) {
 233                 cf->eof = 1;
 234                 c = '\n';
 235         }
 236         return c;
 237 }
 238
 239 static char *parse_value(void)
 240 {
 241         int quote = 0, comment = 0, space = 0;
 242
 243         strbuf_reset(&cf->value);
 244         for (;;) {
 245                 int c = get_next_char();
 246                 if (c == '\n') {
 247                         if (quote) {
 248                                 cf->linenr--;
 249                                 return NULL;
 250                         }
 251                         return cf->value.buf;
 252                 }
 253                 if (comment)
 254                         continue;
 255                 if (isspace(c) && !quote) {
 256                         if (cf->value.len)
 257                                 space++;
 258                         continue;
 259                 }
 260                 if (!quote) {
 261                         if (c == ';' || c == '#') {
 262                                 comment = 1;
 263                                 continue;
 264                         }
 265                 }
 266                 for (; space; space--)
 267                         strbuf_addch(&cf->value, ' ');
 268                 if (c == '\\') {
 269                         c = get_next_char();
 270                         switch (c) {
 271                         case '\n':
 272                                 continue;
 273                         case 't':
 274                                 c = '\t';
 275                                 break;
 276                         case 'b':
 277                                 c = '\b';
 278                                 break;
 279                         case 'n':
 280                                 c = '\n';
 281                                 break;
 282                         /* Some characters escape as themselves */
 283                         case '\\': case '"':
 284                                 break;
 285                         /* Reject unknown escape sequences */
 286                         default:
 287                                 return NULL;
 288                         }
 289                         strbuf_addch(&cf->value, c);
 290                         continue;
 291                 }
 292                 if (c == '"') {
 293                         quote = 1-quote;
 294                         continue;
 295                 }
 296                 strbuf_addch(&cf->value, c);
 297         }
 298 }
 299
 300 static inline int iskeychar(int c)
 301 {
 302         return isalnum(c) || c == '-';
 303 }
 304
 305 static int get_value(config_fn_t fn, void *data, struct strbuf *name)
 306 {
 307         int c;
 308         char *value;
 309
 310         /* Get the full name */
 311         for (;;) {
 312                 c = get_next_char();
 313                 if (cf->eof)
 314                         break;
 315                 if (!iskeychar(c))
 316                         break;
 317                 strbuf_addch(name, tolower(c));
 318         }
 319
 320         while (c == ' ' || c == '\t')
 321                 c = get_next_char();
 322
 323         value = NULL;
 324         if (c != '\n') {
 325                 if (c != '=')
 326                         return -1;
 327                 value = parse_value();
 328                 if (!value)
 329                         return -1;
 330         }
 331         return fn(name->buf, value, data);
 332 }
 333
 334 static int get_extended_base_var(struct strbuf *name, int c)
 335 {
 336         do {
 337                 if (c == '\n')
 338                         goto error_incomplete_line;
 339                 c = get_next_char();
 340         } while (isspace(c));
 341
 342         /* We require the format to be '[base "extension"]' */
 343         if (c != '"')
 344                 return -1;
 345         strbuf_addch(name, '.');
 346
 347         for (;;) {
 348                 int c = get_next_char();
 349                 if (c == '\n')
 350                         goto error_incomplete_line;
 351                 if (c == '"')
 352                         break;
 353                 if (c == '\\') {
 354                         c = get_next_char();
 355                         if (c == '\n')
 356                                 goto error_incomplete_line;
 357                 }
 358                 strbuf_addch(name, c);
 359         }
 360
 361         /* Final ']' */
 362         if (get_next_char() != ']')
 363                 return -1;
 364         return 0;
 365 error_incomplete_line:
 366         cf->linenr--;
 367         return -1;
 368 }
 369
 370 static int get_base_var(struct strbuf *name)
 371 {
 372         for (;;) {
 373                 int c = get_next_char();
 374                 if (cf->eof)
 375                         return -1;
 376                 if (c == ']')
 377                         return 0;
 378                 if (isspace(c))
 379                         return get_extended_base_var(name, c);
 380                 if (!iskeychar(c) && c != '.')
 381                         return -1;
 382                 strbuf_addch(name, tolower(c));
 383         }
 384 }
 385
 386 static int git_parse_source(config_fn_t fn, void *data)
 387 {
 388         int comment = 0;
 389         int baselen = 0;
 390         struct strbuf *var = &cf->var;
 391
 392         /* U+FEFF Byte Order Mark in UTF8 */
 393         static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 394         const unsigned char *bomptr = utf8_bom;
 395
 396         for (;;) {
 397                 int c = get_next_char();
 398                 if (bomptr && *bomptr) {
 399                         /* We are at the file beginning; skip UTF8-encoded BOM
 400                          * if present. Sane editors won't put this in on their
 401                          * own, but e.g. Windows Notepad will do it happily. */
 402                         if ((unsigned char) c == *bomptr) {
 403                                 bomptr++;
 404                                 continue;
 405                         } else {
 406                                 /* Do not tolerate partial BOM. */
 407                                 if (bomptr != utf8_bom)
 408                                         break;
 409                                 /* No BOM at file beginning. Cool. */
 410                                 bomptr = NULL;
 411                         }
 412                 }
 413                 if (c == '\n') {
 414                         if (cf->eof)
 415                                 return 0;
 416                         comment = 0;
 417                         continue;
 418                 }
 419                 if (comment || isspace(c))
 420                         continue;
 421                 if (c == '#' || c == ';') {
 422                         comment = 1;
 423                         continue;
 424                 }
 425                 if (c == '[') {
 426                         /* Reset prior to determining a new stem */
 427                         strbuf_reset(var);
 428                         if (get_base_var(var) < 0 || var->len < 1)
 429                                 break;
 430                         strbuf_addch(var, '.');
 431                         baselen = var->len;
 432                         continue;
 433                 }
 434                 if (!isalpha(c))
 435                         break;
 436                 /*
 437                  * Truncate the var name back to the section header
 438                  * stem prior to grabbing the suffix part of the name
 439                  * and the value.
 440                  */
 441                 strbuf_setlen(var, baselen);
 442                 strbuf_addch(var, tolower(c));
 443                 if (get_value(fn, data, var) < 0)
 444                         break;
 445         }
 446         if (cf->die_on_error)
 447                 die("bad config file line %d in %s", cf->linenr, cf->name);
 448         else
 449                 return error("bad config file line %d in %s", cf->linenr, cf->name);
 450 }
 451
 452 static int parse_unit_factor(const char *end, uintmax_t *val)
 453 {
 454         if (!*end)
 455                 return 1;
 456         else if (!strcasecmp(end, "k")) {
 457                 *val *= 1024;
 458                 return 1;
 459         }
 460         else if (!strcasecmp(end, "m")) {
 461                 *val *= 1024 * 1024;
 462                 return 1;
 463         }
 464         else if (!strcasecmp(end, "g")) {
 465                 *val *= 1024 * 1024 * 1024;
 466                 return 1;
 467         }
 468         return 0;
 469 }
 470
 471 static int git_parse_signed(const char *value, intmax_t *ret, intmax_t max)
 472 {
 473         if (value && *value) {
 474                 char *end;
 475                 intmax_t val;
 476                 uintmax_t uval;
 477                 uintmax_t factor = 1;
 478
 479                 errno = 0;
 480                 val = strtoimax(value, &end, 0);
 481                 if (errno == ERANGE)
 482                         return 0;
 483                 if (!parse_unit_factor(end, &factor)) {
 484                         errno = EINVAL;
 485                         return 0;
 486                 }
 487                 uval = abs(val);
 488                 uval *= factor;
 489                 if (uval > max || abs(val) > uval) {
 490                         errno = ERANGE;
 491                         return 0;
 492                 }
 493                 val *= factor;
 494                 *ret = val;
 495                 return 1;
 496         }
 497         errno = EINVAL;
 498         return 0;
 499 }
 500
 501 int git_parse_unsigned(const char *value, uintmax_t *ret, uintmax_t max)
 502 {
 503         if (value && *value) {
 504                 char *end;
 505                 uintmax_t val;
 506                 uintmax_t oldval;
 507
 508                 errno = 0;
 509                 val = strtoumax(value, &end, 0);
 510                 if (errno == ERANGE)
 511                         return 0;
 512                 oldval = val;
 513                 if (!parse_unit_factor(end, &val)) {
 514                         errno = EINVAL;
 515                         return 0;
 516                 }
 517                 if (val > max || oldval > val) {
 518                         errno = ERANGE;
 519                         return 0;
 520                 }
 521                 *ret = val;
 522                 return 1;
 523         }
 524         errno = EINVAL;
 525         return 0;
 526 }
 527
 528 static int git_parse_int(const char *value, int *ret)
 529 {
 530         intmax_t tmp;
 531         if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int)))
 532                 return 0;
 533         *ret = tmp;
 534         return 1;
 535 }
 536
 537 int git_parse_ulong(const char *value, unsigned long *ret)
 538 {
 539         uintmax_t tmp;
 540         if (!git_parse_unsigned(value, &tmp, maximum_unsigned_value_of_type(long)))
 541                 return 0;
 542         *ret = tmp;
 543         return 1;
 544 }
 545
 546 static void die_bad_config(const char *name)
 547 {
 548         if (cf && cf->name)
 549                 die("bad config value for '%s' in %s", name, cf->name);
 550         die("bad config value for '%s'", name);
 551 }
 552
 553 int git_config_int(const char *name, const char *value)
 554 {
 555         int ret;
 556         if (!git_parse_int(value, &ret))
 557                 die_bad_config(name);
 558         return ret;
 559 }
 560
 561 unsigned long git_config_ulong(const char *name, const char *value)
 562 {
 563         unsigned long ret;
 564         if (!git_parse_ulong(value, &ret))
 565                 die_bad_config(name);
 566         return ret;
 567 }
 568
 569 static int git_config_maybe_bool_text(const char *name, const char *value)
 570 {
 571         if (!value)
 572                 return 1;
 573         if (!*value)
 574                 return 0;
 575         if (!strcasecmp(value, "true")
 576             || !strcasecmp(value, "yes")
 577             || !strcasecmp(value, "on"))
 578                 return 1;
 579         if (!strcasecmp(value, "false")
 580             || !strcasecmp(value, "no")
 581             || !strcasecmp(value, "off"))
 582                 return 0;
 583         return -1;
 584 }
 585
 586 int git_config_maybe_bool(const char *name, const char *value)
 587 {
 588         int v = git_config_maybe_bool_text(name, value);
 589         if (0 <= v)
 590                 return v;
 591         if (git_parse_int(value, &v))
 592                 return !!v;
 593         return -1;
 594 }
 595
 596 int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 597 {
 598         int v = git_config_maybe_bool_text(name, value);
 599         if (0 <= v) {
 600                 *is_bool = 1;
 601                 return v;
 602         }
 603         *is_bool = 0;
 604         return git_config_int(name, value);
 605 }
 606
 607 int git_config_bool(const char *name, const char *value)
 608 {
 609         int discard;
 610         return !!git_config_bool_or_int(name, value, &discard);
 611 }
 612
 613 int git_config_string(const char **dest, const char *var, const char *value)
 614 {
 615         if (!value)
 616                 return config_error_nonbool(var);
 617         *dest = xstrdup(value);
 618         return 0;
 619 }
 620
 621 int git_config_pathname(const char **dest, const char *var, const char *value)
 622 {
 623         if (!value)
 624                 return config_error_nonbool(var);
 625         *dest = expand_user_path(value);
 626         if (!*dest)
 627                 die("Failed to expand user dir in: '%s'", value);
 628         return 0;
 629 }
 630
 631 static int git_default_core_config(const char *var, const char *value)
 632 {
 633         /* This needs a better name */
 634         if (!strcmp(var, "core.filemode")) {
 635                 trust_executable_bit = git_config_bool(var, value);
 636                 return 0;
 637         }
 638         if (!strcmp(var, "core.trustctime")) {
 639                 trust_ctime = git_config_bool(var, value);
 640                 return 0;
 641         }
 642         if (!strcmp(var, "core.statinfo") ||
 643             !strcmp(var, "core.checkstat")) {
 644                 /*
 645                  * NEEDSWORK: statinfo was a typo in v1.8.2 that has
 646                  * never been advertised.  we will remove it at Git
 647                  * 2.0 boundary.
 648                  */
 649                 if (!strcmp(var, "core.statinfo")) {
 650                         static int warned;
 651                         if (!warned++) {
 652                                 warning("'core.statinfo' will be removed in Git 2.0; "
 653                                         "use 'core.checkstat' instead.");
 654                         }
 655                 }
 656                 if (!strcasecmp(value, "default"))
 657                         check_stat = 1;
 658                 else if (!strcasecmp(value, "minimal"))
 659                         check_stat = 0;
 660         }
 661
 662         if (!strcmp(var, "core.quotepath")) {
 663                 quote_path_fully = git_config_bool(var, value);
 664                 return 0;
 665         }
 666
 667         if (!strcmp(var, "core.symlinks")) {
 668                 has_symlinks = git_config_bool(var, value);
 669                 return 0;
 670         }
 671
 672         if (!strcmp(var, "core.ignorecase")) {
 673                 ignore_case = git_config_bool(var, value);
 674                 return 0;
 675         }
 676
 677         if (!strcmp(var, "core.attributesfile"))
 678                 return git_config_pathname(&git_attributes_file, var, value);
 679
 680         if (!strcmp(var, "core.bare")) {
 681                 is_bare_repository_cfg = git_config_bool(var, value);
 682                 return 0;
 683         }
 684
 685         if (!strcmp(var, "core.ignorestat")) {
 686                 assume_unchanged = git_config_bool(var, value);
 687                 return 0;
 688         }
 689
 690         if (!strcmp(var, "core.prefersymlinkrefs")) {
 691                 prefer_symlink_refs = git_config_bool(var, value);
 692                 return 0;
 693         }
 694
 695         if (!strcmp(var, "core.logallrefupdates")) {
 696                 log_all_ref_updates = git_config_bool(var, value);
 697                 return 0;
 698         }
 699
 700         if (!strcmp(var, "core.warnambiguousrefs")) {
 701                 warn_ambiguous_refs = git_config_bool(var, value);
 702                 return 0;
 703         }
 704
 705         if (!strcmp(var, "core.abbrev")) {
 706                 int abbrev = git_config_int(var, value);
 707                 if (abbrev < minimum_abbrev || abbrev > 40)
 708                         return -1;
 709                 default_abbrev = abbrev;
 710                 return 0;
 711         }
 712
 713         if (!strcmp(var, "core.loosecompression")) {
 714                 int level = git_config_int(var, value);
 715                 if (level == -1)
 716                         level = Z_DEFAULT_COMPRESSION;
 717                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 718                         die("bad zlib compression level %d", level);
 719                 zlib_compression_level = level;
 720                 zlib_compression_seen = 1;
 721                 return 0;
 722         }
 723
 724         if (!strcmp(var, "core.compression")) {
 725                 int level = git_config_int(var, value);
 726                 if (level == -1)
 727                         level = Z_DEFAULT_COMPRESSION;
 728                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 729                         die("bad zlib compression level %d", level);
 730                 core_compression_level = level;
 731                 core_compression_seen = 1;
 732                 if (!zlib_compression_seen)
 733                         zlib_compression_level = level;
 734                 return 0;
 735         }
 736
 737         if (!strcmp(var, "core.packedgitwindowsize")) {
 738                 int pgsz_x2 = getpagesize() * 2;
 739                 packed_git_window_size = git_config_ulong(var, value);
 740
 741                 /* This value must be multiple of (pagesize * 2) */
 742                 packed_git_window_size /= pgsz_x2;
 743                 if (packed_git_window_size < 1)
 744                         packed_git_window_size = 1;
 745                 packed_git_window_size *= pgsz_x2;
 746                 return 0;
 747         }
 748
 749         if (!strcmp(var, "core.bigfilethreshold")) {
 750                 big_file_threshold = git_config_ulong(var, value);
 751                 return 0;
 752         }
 753
 754         if (!strcmp(var, "core.packedgitlimit")) {
 755                 packed_git_limit = git_config_ulong(var, value);
 756                 return 0;
 757         }
 758
 759         if (!strcmp(var, "core.deltabasecachelimit")) {
 760                 delta_base_cache_limit = git_config_ulong(var, value);
 761                 return 0;
 762         }
 763
 764         if (!strcmp(var, "core.autocrlf")) {
 765                 if (value && !strcasecmp(value, "input")) {
 766                         if (core_eol == EOL_CRLF)
 767                                 return error("core.autocrlf=input conflicts with core.eol=crlf");
 768                         auto_crlf = AUTO_CRLF_INPUT;
 769                         return 0;
 770                 }
 771                 auto_crlf = git_config_bool(var, value);
 772                 return 0;
 773         }
 774
 775         if (!strcmp(var, "core.safecrlf")) {
 776                 if (value && !strcasecmp(value, "warn")) {
 777                         safe_crlf = SAFE_CRLF_WARN;
 778                         return 0;
 779                 }
 780                 safe_crlf = git_config_bool(var, value);
 781                 return 0;
 782         }
 783
 784         if (!strcmp(var, "core.eol")) {
 785                 if (value && !strcasecmp(value, "lf"))
 786                         core_eol = EOL_LF;
 787                 else if (value && !strcasecmp(value, "crlf"))
 788                         core_eol = EOL_CRLF;
 789                 else if (value && !strcasecmp(value, "native"))
 790                         core_eol = EOL_NATIVE;
 791                 else
 792                         core_eol = EOL_UNSET;
 793                 if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 794                         return error("core.autocrlf=input conflicts with core.eol=crlf");
 795                 return 0;
 796         }
 797
 798         if (!strcmp(var, "core.notesref")) {
 799                 notes_ref_name = xstrdup(value);
 800                 return 0;
 801         }
 802
 803         if (!strcmp(var, "core.pager"))
 804                 return git_config_string(&pager_program, var, value);
 805
 806         if (!strcmp(var, "core.editor"))
 807                 return git_config_string(&editor_program, var, value);
 808
 809         if (!strcmp(var, "core.commentchar")) {
 810                 const char *comment;
 811                 int ret = git_config_string(&comment, var, value);
 812                 if (!ret)
 813                         comment_line_char = comment[0];
 814                 return ret;
 815         }
 816
 817         if (!strcmp(var, "core.askpass"))
 818                 return git_config_string(&askpass_program, var, value);
 819
 820         if (!strcmp(var, "core.excludesfile"))
 821                 return git_config_pathname(&excludes_file, var, value);
 822
 823         if (!strcmp(var, "core.whitespace")) {
 824                 if (!value)
 825                         return config_error_nonbool(var);
 826                 whitespace_rule_cfg = parse_whitespace_rule(value);
 827                 return 0;
 828         }
 829
 830         if (!strcmp(var, "core.fsyncobjectfiles")) {
 831                 fsync_object_files = git_config_bool(var, value);
 832                 return 0;
 833         }
 834
 835         if (!strcmp(var, "core.preloadindex")) {
 836                 core_preload_index = git_config_bool(var, value);
 837                 return 0;
 838         }
 839
 840         if (!strcmp(var, "core.createobject")) {
 841                 if (!strcmp(value, "rename"))
 842                         object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 843                 else if (!strcmp(value, "link"))
 844                         object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 845                 else
 846                         die("Invalid mode for object creation: %s", value);
 847                 return 0;
 848         }
 849
 850         if (!strcmp(var, "core.sparsecheckout")) {
 851                 core_apply_sparse_checkout = git_config_bool(var, value);
 852                 return 0;
 853         }
 854
 855         if (!strcmp(var, "core.precomposeunicode")) {
 856                 precomposed_unicode = git_config_bool(var, value);
 857                 return 0;
 858         }
 859
 860         /* Add other config variables here and to Documentation/config.txt. */
 861         return 0;
 862 }
 863
 864 static int git_default_i18n_config(const char *var, const char *value)
 865 {
 866         if (!strcmp(var, "i18n.commitencoding"))
 867                 return git_config_string(&git_commit_encoding, var, value);
 868
 869         if (!strcmp(var, "i18n.logoutputencoding"))
 870                 return git_config_string(&git_log_output_encoding, var, value);
 871
 872         /* Add other config variables here and to Documentation/config.txt. */
 873         return 0;
 874 }
 875
 876 static int git_default_branch_config(const char *var, const char *value)
 877 {
 878         if (!strcmp(var, "branch.autosetupmerge")) {
 879                 if (value && !strcasecmp(value, "always")) {
 880                         git_branch_track = BRANCH_TRACK_ALWAYS;
 881                         return 0;
 882                 }
 883                 git_branch_track = git_config_bool(var, value);
 884                 return 0;
 885         }
 886         if (!strcmp(var, "branch.autosetuprebase")) {
 887                 if (!value)
 888                         return config_error_nonbool(var);
 889                 else if (!strcmp(value, "never"))
 890                         autorebase = AUTOREBASE_NEVER;
 891                 else if (!strcmp(value, "local"))
 892                         autorebase = AUTOREBASE_LOCAL;
 893                 else if (!strcmp(value, "remote"))
 894                         autorebase = AUTOREBASE_REMOTE;
 895                 else if (!strcmp(value, "always"))
 896                         autorebase = AUTOREBASE_ALWAYS;
 897                 else
 898                         return error("Malformed value for %s", var);
 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_push_config(const char *var, const char *value)
 907 {
 908         if (!strcmp(var, "push.default")) {
 909                 if (!value)
 910                         return config_error_nonbool(var);
 911                 else if (!strcmp(value, "nothing"))
 912                         push_default = PUSH_DEFAULT_NOTHING;
 913                 else if (!strcmp(value, "matching"))
 914                         push_default = PUSH_DEFAULT_MATCHING;
 915                 else if (!strcmp(value, "simple"))
 916                         push_default = PUSH_DEFAULT_SIMPLE;
 917                 else if (!strcmp(value, "upstream"))
 918                         push_default = PUSH_DEFAULT_UPSTREAM;
 919                 else if (!strcmp(value, "tracking")) /* deprecated */
 920                         push_default = PUSH_DEFAULT_UPSTREAM;
 921                 else if (!strcmp(value, "current"))
 922                         push_default = PUSH_DEFAULT_CURRENT;
 923                 else {
 924                         error("Malformed value for %s: %s", var, value);
 925                         return error("Must be one of nothing, matching, simple, "
 926                                      "upstream or current.");
 927                 }
 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_mailmap_config(const char *var, const char *value)
 936 {
 937         if (!strcmp(var, "mailmap.file"))
 938                 return git_config_string(&git_mailmap_file, var, value);
 939         if (!strcmp(var, "mailmap.blob"))
 940                 return git_config_string(&git_mailmap_blob, var, value);
 941
 942         /* Add other config variables here and to Documentation/config.txt. */
 943         return 0;
 944 }
 945
 946 int git_default_config(const char *var, const char *value, void *dummy)
 947 {
 948         if (!prefixcmp(var, "core."))
 949                 return git_default_core_config(var, value);
 950
 951         if (!prefixcmp(var, "user."))
 952                 return git_ident_config(var, value, dummy);
 953
 954         if (!prefixcmp(var, "i18n."))
 955                 return git_default_i18n_config(var, value);
 956
 957         if (!prefixcmp(var, "branch."))
 958                 return git_default_branch_config(var, value);
 959
 960         if (!prefixcmp(var, "push."))
 961                 return git_default_push_config(var, value);
 962
 963         if (!prefixcmp(var, "mailmap."))
 964                 return git_default_mailmap_config(var, value);
 965
 966         if (!prefixcmp(var, "advice."))
 967                 return git_default_advice_config(var, value);
 968
 969         if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 970                 pager_use_color = git_config_bool(var,value);
 971                 return 0;
 972         }
 973
 974         if (!strcmp(var, "pack.packsizelimit")) {
 975                 pack_size_limit_cfg = git_config_ulong(var, value);
 976                 return 0;
 977         }
 978         /* Add other config variables here and to Documentation/config.txt. */
 979         return 0;
 980 }
 981
 982 /*
 983  * All source specific fields in the union, die_on_error, name and the callbacks
 984  * fgetc, ungetc, ftell of top need to be initialized before calling
 985  * this function.
 986  */
 987 static int do_config_from(struct config_source *top, config_fn_t fn, void *data)
 988 {
 989         int ret;
 990
 991         /* push config-file parsing state stack */
 992         top->prev = cf;
 993         top->linenr = 1;
 994         top->eof = 0;
 995         strbuf_init(&top->value, 1024);
 996         strbuf_init(&top->var, 1024);
 997         cf = top;
 998
 999         ret = git_parse_source(fn, data);
1000
1001         /* pop config-file parsing state stack */
1002         strbuf_release(&top->value);
1003         strbuf_release(&top->var);
1004         cf = top->prev;
1005
1006         return ret;
1007 }
1008
1009 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
1010 {
1011         int ret;
1012         FILE *f = fopen(filename, "r");
1013
1014         ret = -1;
1015         if (f) {
1016                 struct config_source top;
1017
1018                 top.u.file = f;
1019                 top.name = filename;
1020                 top.die_on_error = 1;
1021                 top.fgetc = config_file_fgetc;
1022                 top.ungetc = config_file_ungetc;
1023                 top.ftell = config_file_ftell;
1024
1025                 ret = do_config_from(&top, fn, data);
1026
1027                 fclose(f);
1028         }
1029         return ret;
1030 }
1031
1032 int git_config_from_buf(config_fn_t fn, const char *name, const char *buf,
1033                         size_t len, void *data)
1034 {
1035         struct config_source top;
1036
1037         top.u.buf.buf = buf;
1038         top.u.buf.len = len;
1039         top.u.buf.pos = 0;
1040         top.name = name;
1041         top.die_on_error = 0;
1042         top.fgetc = config_buf_fgetc;
1043         top.ungetc = config_buf_ungetc;
1044         top.ftell = config_buf_ftell;
1045
1046         return do_config_from(&top, fn, data);
1047 }
1048
1049 static int git_config_from_blob_sha1(config_fn_t fn,
1050                                      const char *name,
1051                                      const unsigned char *sha1,
1052                                      void *data)
1053 {
1054         enum object_type type;
1055         char *buf;
1056         unsigned long size;
1057         int ret;
1058
1059         buf = read_sha1_file(sha1, &type, &size);
1060         if (!buf)
1061                 return error("unable to load config blob object '%s'", name);
1062         if (type != OBJ_BLOB) {
1063                 free(buf);
1064                 return error("reference '%s' does not point to a blob", name);
1065         }
1066
1067         ret = git_config_from_buf(fn, name, buf, size, data);
1068         free(buf);
1069
1070         return ret;
1071 }
1072
1073 static int git_config_from_blob_ref(config_fn_t fn,
1074                                     const char *name,
1075                                     void *data)
1076 {
1077         unsigned char sha1[20];
1078
1079         if (get_sha1(name, sha1) < 0)
1080                 return error("unable to resolve config blob '%s'", name);
1081         return git_config_from_blob_sha1(fn, name, sha1, data);
1082 }
1083
1084 const char *git_etc_gitconfig(void)
1085 {
1086         static const char *system_wide;
1087         if (!system_wide)
1088                 system_wide = system_path(ETC_GITCONFIG);
1089         return system_wide;
1090 }
1091
1092 int git_env_bool(const char *k, int def)
1093 {
1094         const char *v = getenv(k);
1095         return v ? git_config_bool(k, v) : def;
1096 }
1097
1098 int git_config_system(void)
1099 {
1100         return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
1101 }
1102
1103 int git_config_early(config_fn_t fn, void *data, const char *repo_config)
1104 {
1105         int ret = 0, found = 0;
1106         char *xdg_config = NULL;
1107         char *user_config = NULL;
1108
1109         home_config_paths(&user_config, &xdg_config, "config");
1110
1111         if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0)) {
1112                 ret += git_config_from_file(fn, git_etc_gitconfig(),
1113                                             data);
1114                 found += 1;
1115         }
1116
1117         if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK)) {
1118                 ret += git_config_from_file(fn, xdg_config, data);
1119                 found += 1;
1120         }
1121
1122         if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK)) {
1123                 ret += git_config_from_file(fn, user_config, data);
1124                 found += 1;
1125         }
1126
1127         if (repo_config && !access_or_die(repo_config, R_OK, 0)) {
1128                 ret += git_config_from_file(fn, repo_config, data);
1129                 found += 1;
1130         }
1131
1132         switch (git_config_from_parameters(fn, data)) {
1133         case -1: /* error */
1134                 die("unable to parse command-line config");
1135                 break;
1136         case 0: /* found nothing */
1137                 break;
1138         default: /* found at least one item */
1139                 found++;
1140                 break;
1141         }
1142
1143         free(xdg_config);
1144         free(user_config);
1145         return ret == 0 ? found : ret;
1146 }
1147
1148 int git_config_with_options(config_fn_t fn, void *data,
1149                             const char *filename,
1150                             const char *blob_ref,
1151                             int respect_includes)
1152 {
1153         char *repo_config = NULL;
1154         int ret;
1155         struct config_include_data inc = CONFIG_INCLUDE_INIT;
1156
1157         if (respect_includes) {
1158                 inc.fn = fn;
1159                 inc.data = data;
1160                 fn = git_config_include;
1161                 data = &inc;
1162         }
1163
1164         /*
1165          * If we have a specific filename, use it. Otherwise, follow the
1166          * regular lookup sequence.
1167          */
1168         if (filename)
1169                 return git_config_from_file(fn, filename, data);
1170         else if (blob_ref)
1171                 return git_config_from_blob_ref(fn, blob_ref, data);
1172
1173         repo_config = git_pathdup("config");
1174         ret = git_config_early(fn, data, repo_config);
1175         if (repo_config)
1176                 free(repo_config);
1177         return ret;
1178 }
1179
1180 int git_config(config_fn_t fn, void *data)
1181 {
1182         return git_config_with_options(fn, data, NULL, NULL, 1);
1183 }
1184
1185 /*
1186  * Find all the stuff for git_config_set() below.
1187  */
1188
1189 #define MAX_MATCHES 512
1190
1191 static struct {
1192         int baselen;
1193         char *key;
1194         int do_not_match;
1195         regex_t *value_regex;
1196         int multi_replace;
1197         size_t offset[MAX_MATCHES];
1198         enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1199         int seen;
1200 } store;
1201
1202 static int matches(const char *key, const char *value)
1203 {
1204         return !strcmp(key, store.key) &&
1205                 (store.value_regex == NULL ||
1206                  (store.do_not_match ^
1207                   !regexec(store.value_regex, value, 0, NULL, 0)));
1208 }
1209
1210 static int store_aux(const char *key, const char *value, void *cb)
1211 {
1212         const char *ep;
1213         size_t section_len;
1214
1215         switch (store.state) {
1216         case KEY_SEEN:
1217                 if (matches(key, value)) {
1218                         if (store.seen == 1 && store.multi_replace == 0) {
1219                                 warning("%s has multiple values", key);
1220                         } else if (store.seen >= MAX_MATCHES) {
1221                                 error("too many matches for %s", key);
1222                                 return 1;
1223                         }
1224
1225                         store.offset[store.seen] = cf->ftell(cf);
1226                         store.seen++;
1227                 }
1228                 break;
1229         case SECTION_SEEN:
1230                 /*
1231                  * What we are looking for is in store.key (both
1232                  * section and var), and its section part is baselen
1233                  * long.  We found key (again, both section and var).
1234                  * We would want to know if this key is in the same
1235                  * section as what we are looking for.  We already
1236                  * know we are in the same section as what should
1237                  * hold store.key.
1238                  */
1239                 ep = strrchr(key, '.');
1240                 section_len = ep - key;
1241
1242                 if ((section_len != store.baselen) ||
1243                     memcmp(key, store.key, section_len+1)) {
1244                         store.state = SECTION_END_SEEN;
1245                         break;
1246                 }
1247
1248                 /*
1249                  * Do not increment matches: this is no match, but we
1250                  * just made sure we are in the desired section.
1251                  */
1252                 store.offset[store.seen] = cf->ftell(cf);
1253                 /* fallthru */
1254         case SECTION_END_SEEN:
1255         case START:
1256                 if (matches(key, value)) {
1257                         store.offset[store.seen] = cf->ftell(cf);
1258                         store.state = KEY_SEEN;
1259                         store.seen++;
1260                 } else {
1261                         if (strrchr(key, '.') - key == store.baselen &&
1262                               !strncmp(key, store.key, store.baselen)) {
1263                                         store.state = SECTION_SEEN;
1264                                         store.offset[store.seen] = cf->ftell(cf);
1265                         }
1266                 }
1267         }
1268         return 0;
1269 }
1270
1271 static int write_error(const char *filename)
1272 {
1273         error("failed to write new configuration file %s", filename);
1274
1275         /* Same error code as "failed to rename". */
1276         return 4;
1277 }
1278
1279 static int store_write_section(int fd, const char *key)
1280 {
1281         const char *dot;
1282         int i, success;
1283         struct strbuf sb = STRBUF_INIT;
1284
1285         dot = memchr(key, '.', store.baselen);
1286         if (dot) {
1287                 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1288                 for (i = dot - key + 1; i < store.baselen; i++) {
1289                         if (key[i] == '"' || key[i] == '\\')
1290                                 strbuf_addch(&sb, '\\');
1291                         strbuf_addch(&sb, key[i]);
1292                 }
1293                 strbuf_addstr(&sb, "\"]\n");
1294         } else {
1295                 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1296         }
1297
1298         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1299         strbuf_release(&sb);
1300
1301         return success;
1302 }
1303
1304 static int store_write_pair(int fd, const char *key, const char *value)
1305 {
1306         int i, success;
1307         int length = strlen(key + store.baselen + 1);
1308         const char *quote = "";
1309         struct strbuf sb = STRBUF_INIT;
1310
1311         /*
1312          * Check to see if the value needs to be surrounded with a dq pair.
1313          * Note that problematic characters are always backslash-quoted; this
1314          * check is about not losing leading or trailing SP and strings that
1315          * follow beginning-of-comment characters (i.e. ';' and '#') by the
1316          * configuration parser.
1317          */
1318         if (value[0] == ' ')
1319                 quote = "\"";
1320         for (i = 0; value[i]; i++)
1321                 if (value[i] == ';' || value[i] == '#')
1322                         quote = "\"";
1323         if (i && value[i - 1] == ' ')
1324                 quote = "\"";
1325
1326         strbuf_addf(&sb, "\t%.*s = %s",
1327                     length, key + store.baselen + 1, quote);
1328
1329         for (i = 0; value[i]; i++)
1330                 switch (value[i]) {
1331                 case '\n':
1332                         strbuf_addstr(&sb, "\\n");
1333                         break;
1334                 case '\t':
1335                         strbuf_addstr(&sb, "\\t");
1336                         break;
1337                 case '"':
1338                 case '\\':
1339                         strbuf_addch(&sb, '\\');
1340                 default:
1341                         strbuf_addch(&sb, value[i]);
1342                         break;
1343                 }
1344         strbuf_addf(&sb, "%s\n", quote);
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 ssize_t find_beginning_of_line(const char *contents, size_t size,
1353         size_t offset_, int *found_bracket)
1354 {
1355         size_t equal_offset = size, bracket_offset = size;
1356         ssize_t offset;
1357
1358 contline:
1359         for (offset = offset_-2; offset > 0
1360                         && contents[offset] != '\n'; offset--)
1361                 switch (contents[offset]) {
1362                         case '=': equal_offset = offset; break;
1363                         case ']': bracket_offset = offset; break;
1364                 }
1365         if (offset > 0 && contents[offset-1] == '\\') {
1366                 offset_ = offset;
1367                 goto contline;
1368         }
1369         if (bracket_offset < equal_offset) {
1370                 *found_bracket = 1;
1371                 offset = bracket_offset+1;
1372         } else
1373                 offset++;
1374
1375         return offset;
1376 }
1377
1378 int git_config_set_in_file(const char *config_filename,
1379                         const char *key, const char *value)
1380 {
1381         return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1382 }
1383
1384 int git_config_set(const char *key, const char *value)
1385 {
1386         return git_config_set_multivar(key, value, NULL, 0);
1387 }
1388
1389 /*
1390  * Auxiliary function to sanity-check and split the key into the section
1391  * identifier and variable name.
1392  *
1393  * Returns 0 on success, -1 when there is an invalid character in the key and
1394  * -2 if there is no section name in the key.
1395  *
1396  * store_key - pointer to char* which will hold a copy of the key with
1397  *             lowercase section and variable name
1398  * baselen - pointer to int which will hold the length of the
1399  *           section + subsection part, can be NULL
1400  */
1401 int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1402 {
1403         int i, dot, baselen;
1404         const char *last_dot = strrchr(key, '.');
1405
1406         /*
1407          * Since "key" actually contains the section name and the real
1408          * key name separated by a dot, we have to know where the dot is.
1409          */
1410
1411         if (last_dot == NULL || last_dot == key) {
1412                 error("key does not contain a section: %s", key);
1413                 return -CONFIG_NO_SECTION_OR_NAME;
1414         }
1415
1416         if (!last_dot[1]) {
1417                 error("key does not contain variable name: %s", key);
1418                 return -CONFIG_NO_SECTION_OR_NAME;
1419         }
1420
1421         baselen = last_dot - key;
1422         if (baselen_)
1423                 *baselen_ = baselen;
1424
1425         /*
1426          * Validate the key and while at it, lower case it for matching.
1427          */
1428         *store_key = xmalloc(strlen(key) + 1);
1429
1430         dot = 0;
1431         for (i = 0; key[i]; i++) {
1432                 unsigned char c = key[i];
1433                 if (c == '.')
1434                         dot = 1;
1435                 /* Leave the extended basename untouched.. */
1436                 if (!dot || i > baselen) {
1437                         if (!iskeychar(c) ||
1438                             (i == baselen + 1 && !isalpha(c))) {
1439                                 error("invalid key: %s", key);
1440                                 goto out_free_ret_1;
1441                         }
1442                         c = tolower(c);
1443                 } else if (c == '\n') {
1444                         error("invalid key (newline): %s", key);
1445                         goto out_free_ret_1;
1446                 }
1447                 (*store_key)[i] = c;
1448         }
1449         (*store_key)[i] = 0;
1450
1451         return 0;
1452
1453 out_free_ret_1:
1454         free(*store_key);
1455         *store_key = NULL;
1456         return -CONFIG_INVALID_KEY;
1457 }
1458
1459 /*
1460  * If value==NULL, unset in (remove from) config,
1461  * if value_regex!=NULL, disregard key/value pairs where value does not match.
1462  * if multi_replace==0, nothing, or only one matching key/value is replaced,
1463  *     else all matching key/values (regardless how many) are removed,
1464  *     before the new pair is written.
1465  *
1466  * Returns 0 on success.
1467  *
1468  * This function does this:
1469  *
1470  * - it locks the config file by creating ".git/config.lock"
1471  *
1472  * - it then parses the config using store_aux() as validator to find
1473  *   the position on the key/value pair to replace. If it is to be unset,
1474  *   it must be found exactly once.
1475  *
1476  * - the config file is mmap()ed and the part before the match (if any) is
1477  *   written to the lock file, then the changed part and the rest.
1478  *
1479  * - the config file is removed and the lock file rename()d to it.
1480  *
1481  */
1482 int git_config_set_multivar_in_file(const char *config_filename,
1483                                 const char *key, const char *value,
1484                                 const char *value_regex, int multi_replace)
1485 {
1486         int fd = -1, in_fd;
1487         int ret;
1488         struct lock_file *lock = NULL;
1489         char *filename_buf = NULL;
1490
1491         /* parse-key returns negative; flip the sign to feed exit(3) */
1492         ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1493         if (ret)
1494                 goto out_free;
1495
1496         store.multi_replace = multi_replace;
1497
1498         if (!config_filename)
1499                 config_filename = filename_buf = git_pathdup("config");
1500
1501         /*
1502          * The lock serves a purpose in addition to locking: the new
1503          * contents of .git/config will be written into it.
1504          */
1505         lock = xcalloc(sizeof(struct lock_file), 1);
1506         fd = hold_lock_file_for_update(lock, config_filename, 0);
1507         if (fd < 0) {
1508                 error("could not lock config file %s: %s", config_filename, strerror(errno));
1509                 free(store.key);
1510                 ret = CONFIG_NO_LOCK;
1511                 goto out_free;
1512         }
1513
1514         /*
1515          * If .git/config does not exist yet, write a minimal version.
1516          */
1517         in_fd = open(config_filename, O_RDONLY);
1518         if ( in_fd < 0 ) {
1519                 free(store.key);
1520
1521                 if ( ENOENT != errno ) {
1522                         error("opening %s: %s", config_filename,
1523                               strerror(errno));
1524                         ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1525                         goto out_free;
1526                 }
1527                 /* if nothing to unset, error out */
1528                 if (value == NULL) {
1529                         ret = CONFIG_NOTHING_SET;
1530                         goto out_free;
1531                 }
1532
1533                 store.key = (char *)key;
1534                 if (!store_write_section(fd, key) ||
1535                     !store_write_pair(fd, key, value))
1536                         goto write_err_out;
1537         } else {
1538                 struct stat st;
1539                 char *contents;
1540                 size_t contents_sz, copy_begin, copy_end;
1541                 int i, new_line = 0;
1542
1543                 if (value_regex == NULL)
1544                         store.value_regex = NULL;
1545                 else {
1546                         if (value_regex[0] == '!') {
1547                                 store.do_not_match = 1;
1548                                 value_regex++;
1549                         } else
1550                                 store.do_not_match = 0;
1551
1552                         store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1553                         if (regcomp(store.value_regex, value_regex,
1554                                         REG_EXTENDED)) {
1555                                 error("invalid pattern: %s", value_regex);
1556                                 free(store.value_regex);
1557                                 ret = CONFIG_INVALID_PATTERN;
1558                                 goto out_free;
1559                         }
1560                 }
1561
1562                 store.offset[0] = 0;
1563                 store.state = START;
1564                 store.seen = 0;
1565
1566                 /*
1567                  * After this, store.offset will contain the *end* offset
1568                  * of the last match, or remain at 0 if no match was found.
1569                  * As a side effect, we make sure to transform only a valid
1570                  * existing config file.
1571                  */
1572                 if (git_config_from_file(store_aux, config_filename, NULL)) {
1573                         error("invalid config file %s", config_filename);
1574                         free(store.key);
1575                         if (store.value_regex != NULL) {
1576                                 regfree(store.value_regex);
1577                                 free(store.value_regex);
1578                         }
1579                         ret = CONFIG_INVALID_FILE;
1580                         goto out_free;
1581                 }
1582
1583                 free(store.key);
1584                 if (store.value_regex != NULL) {
1585                         regfree(store.value_regex);
1586                         free(store.value_regex);
1587                 }
1588
1589                 /* if nothing to unset, or too many matches, error out */
1590                 if ((store.seen == 0 && value == NULL) ||
1591                                 (store.seen > 1 && multi_replace == 0)) {
1592                         ret = CONFIG_NOTHING_SET;
1593                         goto out_free;
1594                 }
1595
1596                 fstat(in_fd, &st);
1597                 contents_sz = xsize_t(st.st_size);
1598                 contents = xmmap(NULL, contents_sz, PROT_READ,
1599                         MAP_PRIVATE, in_fd, 0);
1600                 close(in_fd);
1601
1602                 if (store.seen == 0)
1603                         store.seen = 1;
1604
1605                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1606                         if (store.offset[i] == 0) {
1607                                 store.offset[i] = copy_end = contents_sz;
1608                         } else if (store.state != KEY_SEEN) {
1609                                 copy_end = store.offset[i];
1610                         } else
1611                                 copy_end = find_beginning_of_line(
1612                                         contents, contents_sz,
1613                                         store.offset[i]-2, &new_line);
1614
1615                         if (copy_end > 0 && contents[copy_end-1] != '\n')
1616                                 new_line = 1;
1617
1618                         /* write the first part of the config */
1619                         if (copy_end > copy_begin) {
1620                                 if (write_in_full(fd, contents + copy_begin,
1621                                                   copy_end - copy_begin) <
1622                                     copy_end - copy_begin)
1623                                         goto write_err_out;
1624                                 if (new_line &&
1625                                     write_str_in_full(fd, "\n") != 1)
1626                                         goto write_err_out;
1627                         }
1628                         copy_begin = store.offset[i];
1629                 }
1630
1631                 /* write the pair (value == NULL means unset) */
1632                 if (value != NULL) {
1633                         if (store.state == START) {
1634                                 if (!store_write_section(fd, key))
1635                                         goto write_err_out;
1636                         }
1637                         if (!store_write_pair(fd, key, value))
1638                                 goto write_err_out;
1639                 }
1640
1641                 /* write the rest of the config */
1642                 if (copy_begin < contents_sz)
1643                         if (write_in_full(fd, contents + copy_begin,
1644                                           contents_sz - copy_begin) <
1645                             contents_sz - copy_begin)
1646                                 goto write_err_out;
1647
1648                 munmap(contents, contents_sz);
1649         }
1650
1651         if (commit_lock_file(lock) < 0) {
1652                 error("could not commit config file %s", config_filename);
1653                 ret = CONFIG_NO_WRITE;
1654                 goto out_free;
1655         }
1656
1657         /*
1658          * lock is committed, so don't try to roll it back below.
1659          * NOTE: Since lockfile.c keeps a linked list of all created
1660          * lock_file structures, it isn't safe to free(lock).  It's
1661          * better to just leave it hanging around.
1662          */
1663         lock = NULL;
1664         ret = 0;
1665
1666 out_free:
1667         if (lock)
1668                 rollback_lock_file(lock);
1669         free(filename_buf);
1670         return ret;
1671
1672 write_err_out:
1673         ret = write_error(lock->filename);
1674         goto out_free;
1675
1676 }
1677
1678 int git_config_set_multivar(const char *key, const char *value,
1679                         const char *value_regex, int multi_replace)
1680 {
1681         return git_config_set_multivar_in_file(NULL, key, value, value_regex,
1682                                                multi_replace);
1683 }
1684
1685 static int section_name_match (const char *buf, const char *name)
1686 {
1687         int i = 0, j = 0, dot = 0;
1688         if (buf[i] != '[')
1689                 return 0;
1690         for (i = 1; buf[i] && buf[i] != ']'; i++) {
1691                 if (!dot && isspace(buf[i])) {
1692                         dot = 1;
1693                         if (name[j++] != '.')
1694                                 break;
1695                         for (i++; isspace(buf[i]); i++)
1696                                 ; /* do nothing */
1697                         if (buf[i] != '"')
1698                                 break;
1699                         continue;
1700                 }
1701                 if (buf[i] == '\\' && dot)
1702                         i++;
1703                 else if (buf[i] == '"' && dot) {
1704                         for (i++; isspace(buf[i]); i++)
1705                                 ; /* do_nothing */
1706                         break;
1707                 }
1708                 if (buf[i] != name[j++])
1709                         break;
1710         }
1711         if (buf[i] == ']' && name[j] == 0) {
1712                 /*
1713                  * We match, now just find the right length offset by
1714                  * gobbling up any whitespace after it, as well
1715                  */
1716                 i++;
1717                 for (; buf[i] && isspace(buf[i]); i++)
1718                         ; /* do nothing */
1719                 return i;
1720         }
1721         return 0;
1722 }
1723
1724 static int section_name_is_ok(const char *name)
1725 {
1726         /* Empty section names are bogus. */
1727         if (!*name)
1728                 return 0;
1729
1730         /*
1731          * Before a dot, we must be alphanumeric or dash. After the first dot,
1732          * anything goes, so we can stop checking.
1733          */
1734         for (; *name && *name != '.'; name++)
1735                 if (*name != '-' && !isalnum(*name))
1736                         return 0;
1737         return 1;
1738 }
1739
1740 /* if new_name == NULL, the section is removed instead */
1741 int git_config_rename_section_in_file(const char *config_filename,
1742                                       const char *old_name, const char *new_name)
1743 {
1744         int ret = 0, remove = 0;
1745         char *filename_buf = NULL;
1746         struct lock_file *lock;
1747         int out_fd;
1748         char buf[1024];
1749         FILE *config_file;
1750
1751         if (new_name && !section_name_is_ok(new_name)) {
1752                 ret = error("invalid section name: %s", new_name);
1753                 goto out;
1754         }
1755
1756         if (!config_filename)
1757                 config_filename = filename_buf = git_pathdup("config");
1758
1759         lock = xcalloc(sizeof(struct lock_file), 1);
1760         out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1761         if (out_fd < 0) {
1762                 ret = error("could not lock config file %s", config_filename);
1763                 goto out;
1764         }
1765
1766         if (!(config_file = fopen(config_filename, "rb"))) {
1767                 /* no config file means nothing to rename, no error */
1768                 goto unlock_and_out;
1769         }
1770
1771         while (fgets(buf, sizeof(buf), config_file)) {
1772                 int i;
1773                 int length;
1774                 char *output = buf;
1775                 for (i = 0; buf[i] && isspace(buf[i]); i++)
1776                         ; /* do nothing */
1777                 if (buf[i] == '[') {
1778                         /* it's a section */
1779                         int offset = section_name_match(&buf[i], old_name);
1780                         if (offset > 0) {
1781                                 ret++;
1782                                 if (new_name == NULL) {
1783                                         remove = 1;
1784                                         continue;
1785                                 }
1786                                 store.baselen = strlen(new_name);
1787                                 if (!store_write_section(out_fd, new_name)) {
1788                                         ret = write_error(lock->filename);
1789                                         goto out;
1790                                 }
1791                                 /*
1792                                  * We wrote out the new section, with
1793                                  * a newline, now skip the old
1794                                  * section's length
1795                                  */
1796                                 output += offset + i;
1797                                 if (strlen(output) > 0) {
1798                                         /*
1799                                          * More content means there's
1800                                          * a declaration to put on the
1801                                          * next line; indent with a
1802                                          * tab
1803                                          */
1804                                         output -= 1;
1805                                         output[0] = '\t';
1806                                 }
1807                         }
1808                         remove = 0;
1809                 }
1810                 if (remove)
1811                         continue;
1812                 length = strlen(output);
1813                 if (write_in_full(out_fd, output, length) != length) {
1814                         ret = write_error(lock->filename);
1815                         goto out;
1816                 }
1817         }
1818         fclose(config_file);
1819 unlock_and_out:
1820         if (commit_lock_file(lock) < 0)
1821                 ret = error("could not commit config file %s", config_filename);
1822 out:
1823         free(filename_buf);
1824         return ret;
1825 }
1826
1827 int git_config_rename_section(const char *old_name, const char *new_name)
1828 {
1829         return git_config_rename_section_in_file(NULL, old_name, new_name);
1830 }
1831
1832 /*
1833  * Call this to report error for your variable that should not
1834  * get a boolean value (i.e. "[my] var" means "true").
1835  */
1836 #undef config_error_nonbool
1837 int config_error_nonbool(const char *var)
1838 {
1839         return error("Missing value for '%s'", var);
1840 }
1841
1842 int parse_config_key(const char *var,
1843                      const char *section,
1844                      const char **subsection, int *subsection_len,
1845                      const char **key)
1846 {
1847         int section_len = strlen(section);
1848         const char *dot;
1849
1850         /* Does it start with "section." ? */
1851         if (prefixcmp(var, section) || var[section_len] != '.')
1852                 return -1;
1853
1854         /*
1855          * Find the key; we don't know yet if we have a subsection, but we must
1856          * parse backwards from the end, since the subsection may have dots in
1857          * it, too.
1858          */
1859         dot = strrchr(var, '.');
1860         *key = dot + 1;
1861
1862         /* Did we have a subsection at all? */
1863         if (dot == var + section_len) {
1864                 *subsection = NULL;
1865                 *subsection_len = 0;
1866         }
1867         else {
1868                 *subsection = var + section_len + 1;
1869                 *subsection_len = dot - *subsection;
1870         }
1871
1872         return 0;
1873 }