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 "lockfile.h"
  10 #include "exec_cmd.h"
  11 #include "strbuf.h"
  12 #include "quote.h"
  13 #include "hashmap.h"
  14 #include "string-list.h"
  15
  16 struct config_source {
  17         struct config_source *prev;
  18         union {
  19                 FILE *file;
  20                 struct config_buf {
  21                         const char *buf;
  22                         size_t len;
  23                         size_t pos;
  24                 } buf;
  25         } u;
  26         const char *name;
  27         const char *path;
  28         int die_on_error;
  29         int linenr;
  30         int eof;
  31         struct strbuf value;
  32         struct strbuf var;
  33
  34         int (*do_fgetc)(struct config_source *c);
  35         int (*do_ungetc)(int c, struct config_source *conf);
  36         long (*do_ftell)(struct config_source *c);
  37 };
  38
  39 static struct config_source *cf;
  40
  41 static int zlib_compression_seen;
  42
  43 /*
  44  * Default config_set that contains key-value pairs from the usual set of config
  45  * config files (i.e repo specific .git/config, user wide ~/.gitconfig, XDG
  46  * config file and the global /etc/gitconfig)
  47  */
  48 static struct config_set the_config_set;
  49
  50 static int config_file_fgetc(struct config_source *conf)
  51 {
  52         return fgetc(conf->u.file);
  53 }
  54
  55 static int config_file_ungetc(int c, struct config_source *conf)
  56 {
  57         return ungetc(c, conf->u.file);
  58 }
  59
  60 static long config_file_ftell(struct config_source *conf)
  61 {
  62         return ftell(conf->u.file);
  63 }
  64
  65
  66 static int config_buf_fgetc(struct config_source *conf)
  67 {
  68         if (conf->u.buf.pos < conf->u.buf.len)
  69                 return conf->u.buf.buf[conf->u.buf.pos++];
  70
  71         return EOF;
  72 }
  73
  74 static int config_buf_ungetc(int c, struct config_source *conf)
  75 {
  76         if (conf->u.buf.pos > 0)
  77                 return conf->u.buf.buf[--conf->u.buf.pos];
  78
  79         return EOF;
  80 }
  81
  82 static long config_buf_ftell(struct config_source *conf)
  83 {
  84         return conf->u.buf.pos;
  85 }
  86
  87 #define MAX_INCLUDE_DEPTH 10
  88 static const char include_depth_advice[] =
  89 "exceeded maximum include depth (%d) while including\n"
  90 "       %s\n"
  91 "from\n"
  92 "       %s\n"
  93 "Do you have circular includes?";
  94 static int handle_path_include(const char *path, struct config_include_data *inc)
  95 {
  96         int ret = 0;
  97         struct strbuf buf = STRBUF_INIT;
  98         char *expanded;
  99
 100         if (!path)
 101                 return config_error_nonbool("include.path");
 102
 103         expanded = expand_user_path(path);
 104         if (!expanded)
 105                 return error("Could not expand include path '%s'", path);
 106         path = expanded;
 107
 108         /*
 109          * Use an absolute path as-is, but interpret relative paths
 110          * based on the including config file.
 111          */
 112         if (!is_absolute_path(path)) {
 113                 char *slash;
 114
 115                 if (!cf || !cf->path)
 116                         return error("relative config includes must come from files");
 117
 118                 slash = find_last_dir_sep(cf->path);
 119                 if (slash)
 120                         strbuf_add(&buf, cf->path, slash - cf->path + 1);
 121                 strbuf_addstr(&buf, path);
 122                 path = buf.buf;
 123         }
 124
 125         if (!access_or_die(path, R_OK, 0)) {
 126                 if (++inc->depth > MAX_INCLUDE_DEPTH)
 127                         die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
 128                             cf && cf->name ? cf->name : "the command line");
 129                 ret = git_config_from_file(git_config_include, path, inc);
 130                 inc->depth--;
 131         }
 132         strbuf_release(&buf);
 133         free(expanded);
 134         return ret;
 135 }
 136
 137 int git_config_include(const char *var, const char *value, void *data)
 138 {
 139         struct config_include_data *inc = data;
 140         int ret;
 141
 142         /*
 143          * Pass along all values, including "include" directives; this makes it
 144          * possible to query information on the includes themselves.
 145          */
 146         ret = inc->fn(var, value, inc->data);
 147         if (ret < 0)
 148                 return ret;
 149
 150         if (!strcmp(var, "include.path"))
 151                 ret = handle_path_include(value, inc);
 152         return ret;
 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         const char *value;
 172         struct strbuf **pair;
 173
 174         pair = strbuf_split_str(text, '=', 2);
 175         if (!pair[0])
 176                 return error("bogus config parameter: %s", text);
 177
 178         if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=') {
 179                 strbuf_setlen(pair[0], pair[0]->len - 1);
 180                 value = pair[1] ? pair[1]->buf : "";
 181         } else {
 182                 value = NULL;
 183         }
 184
 185         strbuf_trim(pair[0]);
 186         if (!pair[0]->len) {
 187                 strbuf_list_free(pair);
 188                 return error("bogus config parameter: %s", text);
 189         }
 190         strbuf_tolower(pair[0]);
 191         if (fn(pair[0]->buf, value, data) < 0) {
 192                 strbuf_list_free(pair);
 193                 return -1;
 194         }
 195         strbuf_list_free(pair);
 196         return 0;
 197 }
 198
 199 int git_config_from_parameters(config_fn_t fn, void *data)
 200 {
 201         const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 202         char *envw;
 203         const char **argv = NULL;
 204         int nr = 0, alloc = 0;
 205         int i;
 206
 207         if (!env)
 208                 return 0;
 209         /* sq_dequote will write over it */
 210         envw = xstrdup(env);
 211
 212         if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 213                 free(envw);
 214                 return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
 215         }
 216
 217         for (i = 0; i < nr; i++) {
 218                 if (git_config_parse_parameter(argv[i], fn, data) < 0) {
 219                         free(argv);
 220                         free(envw);
 221                         return -1;
 222                 }
 223         }
 224
 225         free(argv);
 226         free(envw);
 227         return nr > 0;
 228 }
 229
 230 static int get_next_char(void)
 231 {
 232         int c = cf->do_fgetc(cf);
 233
 234         if (c == '\r') {
 235                 /* DOS like systems */
 236                 c = cf->do_fgetc(cf);
 237                 if (c != '\n') {
 238                         cf->do_ungetc(c, cf);
 239                         c = '\r';
 240                 }
 241         }
 242         if (c == '\n')
 243                 cf->linenr++;
 244         if (c == EOF) {
 245                 cf->eof = 1;
 246                 cf->linenr++;
 247                 c = '\n';
 248         }
 249         return c;
 250 }
 251
 252 static char *parse_value(void)
 253 {
 254         int quote = 0, comment = 0, space = 0;
 255
 256         strbuf_reset(&cf->value);
 257         for (;;) {
 258                 int c = get_next_char();
 259                 if (c == '\n') {
 260                         if (quote) {
 261                                 cf->linenr--;
 262                                 return NULL;
 263                         }
 264                         return cf->value.buf;
 265                 }
 266                 if (comment)
 267                         continue;
 268                 if (isspace(c) && !quote) {
 269                         if (cf->value.len)
 270                                 space++;
 271                         continue;
 272                 }
 273                 if (!quote) {
 274                         if (c == ';' || c == '#') {
 275                                 comment = 1;
 276                                 continue;
 277                         }
 278                 }
 279                 for (; space; space--)
 280                         strbuf_addch(&cf->value, ' ');
 281                 if (c == '\\') {
 282                         c = get_next_char();
 283                         switch (c) {
 284                         case '\n':
 285                                 continue;
 286                         case 't':
 287                                 c = '\t';
 288                                 break;
 289                         case 'b':
 290                                 c = '\b';
 291                                 break;
 292                         case 'n':
 293                                 c = '\n';
 294                                 break;
 295                         /* Some characters escape as themselves */
 296                         case '\\': case '"':
 297                                 break;
 298                         /* Reject unknown escape sequences */
 299                         default:
 300                                 return NULL;
 301                         }
 302                         strbuf_addch(&cf->value, c);
 303                         continue;
 304                 }
 305                 if (c == '"') {
 306                         quote = 1-quote;
 307                         continue;
 308                 }
 309                 strbuf_addch(&cf->value, c);
 310         }
 311 }
 312
 313 static inline int iskeychar(int c)
 314 {
 315         return isalnum(c) || c == '-';
 316 }
 317
 318 static int get_value(config_fn_t fn, void *data, struct strbuf *name)
 319 {
 320         int c;
 321         char *value;
 322         int ret;
 323
 324         /* Get the full name */
 325         for (;;) {
 326                 c = get_next_char();
 327                 if (cf->eof)
 328                         break;
 329                 if (!iskeychar(c))
 330                         break;
 331                 strbuf_addch(name, tolower(c));
 332         }
 333
 334         while (c == ' ' || c == '\t')
 335                 c = get_next_char();
 336
 337         value = NULL;
 338         if (c != '\n') {
 339                 if (c != '=')
 340                         return -1;
 341                 value = parse_value();
 342                 if (!value)
 343                         return -1;
 344         }
 345         /*
 346          * We already consumed the \n, but we need linenr to point to
 347          * the line we just parsed during the call to fn to get
 348          * accurate line number in error messages.
 349          */
 350         cf->linenr--;
 351         ret = fn(name->buf, value, data);
 352         cf->linenr++;
 353         return ret;
 354 }
 355
 356 static int get_extended_base_var(struct strbuf *name, int c)
 357 {
 358         do {
 359                 if (c == '\n')
 360                         goto error_incomplete_line;
 361                 c = get_next_char();
 362         } while (isspace(c));
 363
 364         /* We require the format to be '[base "extension"]' */
 365         if (c != '"')
 366                 return -1;
 367         strbuf_addch(name, '.');
 368
 369         for (;;) {
 370                 int c = get_next_char();
 371                 if (c == '\n')
 372                         goto error_incomplete_line;
 373                 if (c == '"')
 374                         break;
 375                 if (c == '\\') {
 376                         c = get_next_char();
 377                         if (c == '\n')
 378                                 goto error_incomplete_line;
 379                 }
 380                 strbuf_addch(name, c);
 381         }
 382
 383         /* Final ']' */
 384         if (get_next_char() != ']')
 385                 return -1;
 386         return 0;
 387 error_incomplete_line:
 388         cf->linenr--;
 389         return -1;
 390 }
 391
 392 static int get_base_var(struct strbuf *name)
 393 {
 394         for (;;) {
 395                 int c = get_next_char();
 396                 if (cf->eof)
 397                         return -1;
 398                 if (c == ']')
 399                         return 0;
 400                 if (isspace(c))
 401                         return get_extended_base_var(name, c);
 402                 if (!iskeychar(c) && c != '.')
 403                         return -1;
 404                 strbuf_addch(name, tolower(c));
 405         }
 406 }
 407
 408 static int git_parse_source(config_fn_t fn, void *data)
 409 {
 410         int comment = 0;
 411         int baselen = 0;
 412         struct strbuf *var = &cf->var;
 413
 414         /* U+FEFF Byte Order Mark in UTF8 */
 415         static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 416         const unsigned char *bomptr = utf8_bom;
 417
 418         for (;;) {
 419                 int c = get_next_char();
 420                 if (bomptr && *bomptr) {
 421                         /* We are at the file beginning; skip UTF8-encoded BOM
 422                          * if present. Sane editors won't put this in on their
 423                          * own, but e.g. Windows Notepad will do it happily. */
 424                         if ((unsigned char) c == *bomptr) {
 425                                 bomptr++;
 426                                 continue;
 427                         } else {
 428                                 /* Do not tolerate partial BOM. */
 429                                 if (bomptr != utf8_bom)
 430                                         break;
 431                                 /* No BOM at file beginning. Cool. */
 432                                 bomptr = NULL;
 433                         }
 434                 }
 435                 if (c == '\n') {
 436                         if (cf->eof)
 437                                 return 0;
 438                         comment = 0;
 439                         continue;
 440                 }
 441                 if (comment || isspace(c))
 442                         continue;
 443                 if (c == '#' || c == ';') {
 444                         comment = 1;
 445                         continue;
 446                 }
 447                 if (c == '[') {
 448                         /* Reset prior to determining a new stem */
 449                         strbuf_reset(var);
 450                         if (get_base_var(var) < 0 || var->len < 1)
 451                                 break;
 452                         strbuf_addch(var, '.');
 453                         baselen = var->len;
 454                         continue;
 455                 }
 456                 if (!isalpha(c))
 457                         break;
 458                 /*
 459                  * Truncate the var name back to the section header
 460                  * stem prior to grabbing the suffix part of the name
 461                  * and the value.
 462                  */
 463                 strbuf_setlen(var, baselen);
 464                 strbuf_addch(var, tolower(c));
 465                 if (get_value(fn, data, var) < 0)
 466                         break;
 467         }
 468         if (cf->die_on_error)
 469                 die(_("bad config file line %d in %s"), cf->linenr, cf->name);
 470         else
 471                 return error(_("bad config file line %d in %s"), cf->linenr, cf->name);
 472 }
 473
 474 static int parse_unit_factor(const char *end, uintmax_t *val)
 475 {
 476         if (!*end)
 477                 return 1;
 478         else if (!strcasecmp(end, "k")) {
 479                 *val *= 1024;
 480                 return 1;
 481         }
 482         else if (!strcasecmp(end, "m")) {
 483                 *val *= 1024 * 1024;
 484                 return 1;
 485         }
 486         else if (!strcasecmp(end, "g")) {
 487                 *val *= 1024 * 1024 * 1024;
 488                 return 1;
 489         }
 490         return 0;
 491 }
 492
 493 static int git_parse_signed(const char *value, intmax_t *ret, intmax_t max)
 494 {
 495         if (value && *value) {
 496                 char *end;
 497                 intmax_t val;
 498                 uintmax_t uval;
 499                 uintmax_t factor = 1;
 500
 501                 errno = 0;
 502                 val = strtoimax(value, &end, 0);
 503                 if (errno == ERANGE)
 504                         return 0;
 505                 if (!parse_unit_factor(end, &factor)) {
 506                         errno = EINVAL;
 507                         return 0;
 508                 }
 509                 uval = labs(val);
 510                 uval *= factor;
 511                 if (uval > max || labs(val) > uval) {
 512                         errno = ERANGE;
 513                         return 0;
 514                 }
 515                 val *= factor;
 516                 *ret = val;
 517                 return 1;
 518         }
 519         errno = EINVAL;
 520         return 0;
 521 }
 522
 523 static int git_parse_unsigned(const char *value, uintmax_t *ret, uintmax_t max)
 524 {
 525         if (value && *value) {
 526                 char *end;
 527                 uintmax_t val;
 528                 uintmax_t oldval;
 529
 530                 errno = 0;
 531                 val = strtoumax(value, &end, 0);
 532                 if (errno == ERANGE)
 533                         return 0;
 534                 oldval = val;
 535                 if (!parse_unit_factor(end, &val)) {
 536                         errno = EINVAL;
 537                         return 0;
 538                 }
 539                 if (val > max || oldval > val) {
 540                         errno = ERANGE;
 541                         return 0;
 542                 }
 543                 *ret = val;
 544                 return 1;
 545         }
 546         errno = EINVAL;
 547         return 0;
 548 }
 549
 550 static int git_parse_int(const char *value, int *ret)
 551 {
 552         intmax_t tmp;
 553         if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int)))
 554                 return 0;
 555         *ret = tmp;
 556         return 1;
 557 }
 558
 559 static int git_parse_int64(const char *value, int64_t *ret)
 560 {
 561         intmax_t tmp;
 562         if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int64_t)))
 563                 return 0;
 564         *ret = tmp;
 565         return 1;
 566 }
 567
 568 int git_parse_ulong(const char *value, unsigned long *ret)
 569 {
 570         uintmax_t tmp;
 571         if (!git_parse_unsigned(value, &tmp, maximum_unsigned_value_of_type(long)))
 572                 return 0;
 573         *ret = tmp;
 574         return 1;
 575 }
 576
 577 NORETURN
 578 static void die_bad_number(const char *name, const char *value)
 579 {
 580         const char *reason = errno == ERANGE ?
 581                              "out of range" :
 582                              "invalid unit";
 583         if (!value)
 584                 value = "";
 585
 586         if (cf && cf->name)
 587                 die(_("bad numeric config value '%s' for '%s' in %s: %s"),
 588                     value, name, cf->name, reason);
 589         die(_("bad numeric config value '%s' for '%s': %s"), value, name, reason);
 590 }
 591
 592 int git_config_int(const char *name, const char *value)
 593 {
 594         int ret;
 595         if (!git_parse_int(value, &ret))
 596                 die_bad_number(name, value);
 597         return ret;
 598 }
 599
 600 int64_t git_config_int64(const char *name, const char *value)
 601 {
 602         int64_t ret;
 603         if (!git_parse_int64(value, &ret))
 604                 die_bad_number(name, value);
 605         return ret;
 606 }
 607
 608 unsigned long git_config_ulong(const char *name, const char *value)
 609 {
 610         unsigned long ret;
 611         if (!git_parse_ulong(value, &ret))
 612                 die_bad_number(name, value);
 613         return ret;
 614 }
 615
 616 static int git_config_maybe_bool_text(const char *name, const char *value)
 617 {
 618         if (!value)
 619                 return 1;
 620         if (!*value)
 621                 return 0;
 622         if (!strcasecmp(value, "true")
 623             || !strcasecmp(value, "yes")
 624             || !strcasecmp(value, "on"))
 625                 return 1;
 626         if (!strcasecmp(value, "false")
 627             || !strcasecmp(value, "no")
 628             || !strcasecmp(value, "off"))
 629                 return 0;
 630         return -1;
 631 }
 632
 633 int git_config_maybe_bool(const char *name, const char *value)
 634 {
 635         int v = git_config_maybe_bool_text(name, value);
 636         if (0 <= v)
 637                 return v;
 638         if (git_parse_int(value, &v))
 639                 return !!v;
 640         return -1;
 641 }
 642
 643 int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 644 {
 645         int v = git_config_maybe_bool_text(name, value);
 646         if (0 <= v) {
 647                 *is_bool = 1;
 648                 return v;
 649         }
 650         *is_bool = 0;
 651         return git_config_int(name, value);
 652 }
 653
 654 int git_config_bool(const char *name, const char *value)
 655 {
 656         int discard;
 657         return !!git_config_bool_or_int(name, value, &discard);
 658 }
 659
 660 int git_config_string(const char **dest, const char *var, const char *value)
 661 {
 662         if (!value)
 663                 return config_error_nonbool(var);
 664         *dest = xstrdup(value);
 665         return 0;
 666 }
 667
 668 int git_config_pathname(const char **dest, const char *var, const char *value)
 669 {
 670         if (!value)
 671                 return config_error_nonbool(var);
 672         *dest = expand_user_path(value);
 673         if (!*dest)
 674                 die(_("failed to expand user dir in: '%s'"), value);
 675         return 0;
 676 }
 677
 678 static int git_default_core_config(const char *var, const char *value)
 679 {
 680         /* This needs a better name */
 681         if (!strcmp(var, "core.filemode")) {
 682                 trust_executable_bit = git_config_bool(var, value);
 683                 return 0;
 684         }
 685         if (!strcmp(var, "core.trustctime")) {
 686                 trust_ctime = git_config_bool(var, value);
 687                 return 0;
 688         }
 689         if (!strcmp(var, "core.checkstat")) {
 690                 if (!strcasecmp(value, "default"))
 691                         check_stat = 1;
 692                 else if (!strcasecmp(value, "minimal"))
 693                         check_stat = 0;
 694         }
 695
 696         if (!strcmp(var, "core.quotepath")) {
 697                 quote_path_fully = git_config_bool(var, value);
 698                 return 0;
 699         }
 700
 701         if (!strcmp(var, "core.symlinks")) {
 702                 has_symlinks = git_config_bool(var, value);
 703                 return 0;
 704         }
 705
 706         if (!strcmp(var, "core.ignorecase")) {
 707                 ignore_case = git_config_bool(var, value);
 708                 return 0;
 709         }
 710
 711         if (!strcmp(var, "core.attributesfile"))
 712                 return git_config_pathname(&git_attributes_file, var, value);
 713
 714         if (!strcmp(var, "core.bare")) {
 715                 is_bare_repository_cfg = git_config_bool(var, value);
 716                 return 0;
 717         }
 718
 719         if (!strcmp(var, "core.ignorestat")) {
 720                 assume_unchanged = git_config_bool(var, value);
 721                 return 0;
 722         }
 723
 724         if (!strcmp(var, "core.prefersymlinkrefs")) {
 725                 prefer_symlink_refs = git_config_bool(var, value);
 726                 return 0;
 727         }
 728
 729         if (!strcmp(var, "core.logallrefupdates")) {
 730                 log_all_ref_updates = git_config_bool(var, value);
 731                 return 0;
 732         }
 733
 734         if (!strcmp(var, "core.warnambiguousrefs")) {
 735                 warn_ambiguous_refs = git_config_bool(var, value);
 736                 return 0;
 737         }
 738
 739         if (!strcmp(var, "core.abbrev")) {
 740                 int abbrev = git_config_int(var, value);
 741                 if (abbrev < minimum_abbrev || abbrev > 40)
 742                         return -1;
 743                 default_abbrev = abbrev;
 744                 return 0;
 745         }
 746
 747         if (!strcmp(var, "core.loosecompression")) {
 748                 int level = git_config_int(var, value);
 749                 if (level == -1)
 750                         level = Z_DEFAULT_COMPRESSION;
 751                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 752                         die(_("bad zlib compression level %d"), level);
 753                 zlib_compression_level = level;
 754                 zlib_compression_seen = 1;
 755                 return 0;
 756         }
 757
 758         if (!strcmp(var, "core.compression")) {
 759                 int level = git_config_int(var, value);
 760                 if (level == -1)
 761                         level = Z_DEFAULT_COMPRESSION;
 762                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 763                         die(_("bad zlib compression level %d"), level);
 764                 core_compression_level = level;
 765                 core_compression_seen = 1;
 766                 if (!zlib_compression_seen)
 767                         zlib_compression_level = level;
 768                 return 0;
 769         }
 770
 771         if (!strcmp(var, "core.packedgitwindowsize")) {
 772                 int pgsz_x2 = getpagesize() * 2;
 773                 packed_git_window_size = git_config_ulong(var, value);
 774
 775                 /* This value must be multiple of (pagesize * 2) */
 776                 packed_git_window_size /= pgsz_x2;
 777                 if (packed_git_window_size < 1)
 778                         packed_git_window_size = 1;
 779                 packed_git_window_size *= pgsz_x2;
 780                 return 0;
 781         }
 782
 783         if (!strcmp(var, "core.bigfilethreshold")) {
 784                 big_file_threshold = git_config_ulong(var, value);
 785                 return 0;
 786         }
 787
 788         if (!strcmp(var, "core.packedgitlimit")) {
 789                 packed_git_limit = git_config_ulong(var, value);
 790                 return 0;
 791         }
 792
 793         if (!strcmp(var, "core.deltabasecachelimit")) {
 794                 delta_base_cache_limit = git_config_ulong(var, value);
 795                 return 0;
 796         }
 797
 798         if (!strcmp(var, "core.autocrlf")) {
 799                 if (value && !strcasecmp(value, "input")) {
 800                         if (core_eol == EOL_CRLF)
 801                                 return error("core.autocrlf=input conflicts with core.eol=crlf");
 802                         auto_crlf = AUTO_CRLF_INPUT;
 803                         return 0;
 804                 }
 805                 auto_crlf = git_config_bool(var, value);
 806                 return 0;
 807         }
 808
 809         if (!strcmp(var, "core.safecrlf")) {
 810                 if (value && !strcasecmp(value, "warn")) {
 811                         safe_crlf = SAFE_CRLF_WARN;
 812                         return 0;
 813                 }
 814                 safe_crlf = git_config_bool(var, value);
 815                 return 0;
 816         }
 817
 818         if (!strcmp(var, "core.eol")) {
 819                 if (value && !strcasecmp(value, "lf"))
 820                         core_eol = EOL_LF;
 821                 else if (value && !strcasecmp(value, "crlf"))
 822                         core_eol = EOL_CRLF;
 823                 else if (value && !strcasecmp(value, "native"))
 824                         core_eol = EOL_NATIVE;
 825                 else
 826                         core_eol = EOL_UNSET;
 827                 if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 828                         return error("core.autocrlf=input conflicts with core.eol=crlf");
 829                 return 0;
 830         }
 831
 832         if (!strcmp(var, "core.notesref")) {
 833                 notes_ref_name = xstrdup(value);
 834                 return 0;
 835         }
 836
 837         if (!strcmp(var, "core.pager"))
 838                 return git_config_string(&pager_program, var, value);
 839
 840         if (!strcmp(var, "core.editor"))
 841                 return git_config_string(&editor_program, var, value);
 842
 843         if (!strcmp(var, "core.commentchar")) {
 844                 if (!value)
 845                         return config_error_nonbool(var);
 846                 else if (!strcasecmp(value, "auto"))
 847                         auto_comment_line_char = 1;
 848                 else if (value[0] && !value[1]) {
 849                         comment_line_char = value[0];
 850                         auto_comment_line_char = 0;
 851                 } else
 852                         return error("core.commentChar should only be one character");
 853                 return 0;
 854         }
 855
 856         if (!strcmp(var, "core.askpass"))
 857                 return git_config_string(&askpass_program, var, value);
 858
 859         if (!strcmp(var, "core.excludesfile"))
 860                 return git_config_pathname(&excludes_file, var, value);
 861
 862         if (!strcmp(var, "core.whitespace")) {
 863                 if (!value)
 864                         return config_error_nonbool(var);
 865                 whitespace_rule_cfg = parse_whitespace_rule(value);
 866                 return 0;
 867         }
 868
 869         if (!strcmp(var, "core.fsyncobjectfiles")) {
 870                 fsync_object_files = git_config_bool(var, value);
 871                 return 0;
 872         }
 873
 874         if (!strcmp(var, "core.preloadindex")) {
 875                 core_preload_index = git_config_bool(var, value);
 876                 return 0;
 877         }
 878
 879         if (!strcmp(var, "core.createobject")) {
 880                 if (!strcmp(value, "rename"))
 881                         object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 882                 else if (!strcmp(value, "link"))
 883                         object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 884                 else
 885                         die(_("invalid mode for object creation: %s"), value);
 886                 return 0;
 887         }
 888
 889         if (!strcmp(var, "core.sparsecheckout")) {
 890                 core_apply_sparse_checkout = git_config_bool(var, value);
 891                 return 0;
 892         }
 893
 894         if (!strcmp(var, "core.precomposeunicode")) {
 895                 precomposed_unicode = git_config_bool(var, value);
 896                 return 0;
 897         }
 898
 899         if (!strcmp(var, "core.protecthfs")) {
 900                 protect_hfs = git_config_bool(var, value);
 901                 return 0;
 902         }
 903
 904         if (!strcmp(var, "core.protectntfs")) {
 905                 protect_ntfs = git_config_bool(var, value);
 906                 return 0;
 907         }
 908
 909         /* Add other config variables here and to Documentation/config.txt. */
 910         return 0;
 911 }
 912
 913 static int git_default_i18n_config(const char *var, const char *value)
 914 {
 915         if (!strcmp(var, "i18n.commitencoding"))
 916                 return git_config_string(&git_commit_encoding, var, value);
 917
 918         if (!strcmp(var, "i18n.logoutputencoding"))
 919                 return git_config_string(&git_log_output_encoding, var, value);
 920
 921         /* Add other config variables here and to Documentation/config.txt. */
 922         return 0;
 923 }
 924
 925 static int git_default_branch_config(const char *var, const char *value)
 926 {
 927         if (!strcmp(var, "branch.autosetupmerge")) {
 928                 if (value && !strcasecmp(value, "always")) {
 929                         git_branch_track = BRANCH_TRACK_ALWAYS;
 930                         return 0;
 931                 }
 932                 git_branch_track = git_config_bool(var, value);
 933                 return 0;
 934         }
 935         if (!strcmp(var, "branch.autosetuprebase")) {
 936                 if (!value)
 937                         return config_error_nonbool(var);
 938                 else if (!strcmp(value, "never"))
 939                         autorebase = AUTOREBASE_NEVER;
 940                 else if (!strcmp(value, "local"))
 941                         autorebase = AUTOREBASE_LOCAL;
 942                 else if (!strcmp(value, "remote"))
 943                         autorebase = AUTOREBASE_REMOTE;
 944                 else if (!strcmp(value, "always"))
 945                         autorebase = AUTOREBASE_ALWAYS;
 946                 else
 947                         return error("Malformed value for %s", var);
 948                 return 0;
 949         }
 950
 951         /* Add other config variables here and to Documentation/config.txt. */
 952         return 0;
 953 }
 954
 955 static int git_default_push_config(const char *var, const char *value)
 956 {
 957         if (!strcmp(var, "push.default")) {
 958                 if (!value)
 959                         return config_error_nonbool(var);
 960                 else if (!strcmp(value, "nothing"))
 961                         push_default = PUSH_DEFAULT_NOTHING;
 962                 else if (!strcmp(value, "matching"))
 963                         push_default = PUSH_DEFAULT_MATCHING;
 964                 else if (!strcmp(value, "simple"))
 965                         push_default = PUSH_DEFAULT_SIMPLE;
 966                 else if (!strcmp(value, "upstream"))
 967                         push_default = PUSH_DEFAULT_UPSTREAM;
 968                 else if (!strcmp(value, "tracking")) /* deprecated */
 969                         push_default = PUSH_DEFAULT_UPSTREAM;
 970                 else if (!strcmp(value, "current"))
 971                         push_default = PUSH_DEFAULT_CURRENT;
 972                 else {
 973                         error("Malformed value for %s: %s", var, value);
 974                         return error("Must be one of nothing, matching, simple, "
 975                                      "upstream or current.");
 976                 }
 977                 return 0;
 978         }
 979
 980         /* Add other config variables here and to Documentation/config.txt. */
 981         return 0;
 982 }
 983
 984 static int git_default_mailmap_config(const char *var, const char *value)
 985 {
 986         if (!strcmp(var, "mailmap.file"))
 987                 return git_config_pathname(&git_mailmap_file, var, value);
 988         if (!strcmp(var, "mailmap.blob"))
 989                 return git_config_string(&git_mailmap_blob, var, value);
 990
 991         /* Add other config variables here and to Documentation/config.txt. */
 992         return 0;
 993 }
 994
 995 int git_default_config(const char *var, const char *value, void *dummy)
 996 {
 997         if (starts_with(var, "core."))
 998                 return git_default_core_config(var, value);
 999
1000         if (starts_with(var, "user."))
1001                 return git_ident_config(var, value, dummy);
1002
1003         if (starts_with(var, "i18n."))
1004                 return git_default_i18n_config(var, value);
1005
1006         if (starts_with(var, "branch."))
1007                 return git_default_branch_config(var, value);
1008
1009         if (starts_with(var, "push."))
1010                 return git_default_push_config(var, value);
1011
1012         if (starts_with(var, "mailmap."))
1013                 return git_default_mailmap_config(var, value);
1014
1015         if (starts_with(var, "advice."))
1016                 return git_default_advice_config(var, value);
1017
1018         if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
1019                 pager_use_color = git_config_bool(var,value);
1020                 return 0;
1021         }
1022
1023         if (!strcmp(var, "pack.packsizelimit")) {
1024                 pack_size_limit_cfg = git_config_ulong(var, value);
1025                 return 0;
1026         }
1027         /* Add other config variables here and to Documentation/config.txt. */
1028         return 0;
1029 }
1030
1031 /*
1032  * All source specific fields in the union, die_on_error, name and the callbacks
1033  * fgetc, ungetc, ftell of top need to be initialized before calling
1034  * this function.
1035  */
1036 static int do_config_from(struct config_source *top, config_fn_t fn, void *data)
1037 {
1038         int ret;
1039
1040         /* push config-file parsing state stack */
1041         top->prev = cf;
1042         top->linenr = 1;
1043         top->eof = 0;
1044         strbuf_init(&top->value, 1024);
1045         strbuf_init(&top->var, 1024);
1046         cf = top;
1047
1048         ret = git_parse_source(fn, data);
1049
1050         /* pop config-file parsing state stack */
1051         strbuf_release(&top->value);
1052         strbuf_release(&top->var);
1053         cf = top->prev;
1054
1055         return ret;
1056 }
1057
1058 static int do_config_from_file(config_fn_t fn,
1059                 const char *name, const char *path, FILE *f, void *data)
1060 {
1061         struct config_source top;
1062
1063         top.u.file = f;
1064         top.name = name;
1065         top.path = path;
1066         top.die_on_error = 1;
1067         top.do_fgetc = config_file_fgetc;
1068         top.do_ungetc = config_file_ungetc;
1069         top.do_ftell = config_file_ftell;
1070
1071         return do_config_from(&top, fn, data);
1072 }
1073
1074 static int git_config_from_stdin(config_fn_t fn, void *data)
1075 {
1076         return do_config_from_file(fn, "<stdin>", NULL, stdin, data);
1077 }
1078
1079 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
1080 {
1081         int ret = -1;
1082         FILE *f;
1083
1084         f = fopen(filename, "r");
1085         if (f) {
1086                 ret = do_config_from_file(fn, filename, filename, f, data);
1087                 fclose(f);
1088         }
1089         return ret;
1090 }
1091
1092 int git_config_from_buf(config_fn_t fn, const char *name, const char *buf,
1093                         size_t len, void *data)
1094 {
1095         struct config_source top;
1096
1097         top.u.buf.buf = buf;
1098         top.u.buf.len = len;
1099         top.u.buf.pos = 0;
1100         top.name = name;
1101         top.path = NULL;
1102         top.die_on_error = 0;
1103         top.do_fgetc = config_buf_fgetc;
1104         top.do_ungetc = config_buf_ungetc;
1105         top.do_ftell = config_buf_ftell;
1106
1107         return do_config_from(&top, fn, data);
1108 }
1109
1110 static int git_config_from_blob_sha1(config_fn_t fn,
1111                                      const char *name,
1112                                      const unsigned char *sha1,
1113                                      void *data)
1114 {
1115         enum object_type type;
1116         char *buf;
1117         unsigned long size;
1118         int ret;
1119
1120         buf = read_sha1_file(sha1, &type, &size);
1121         if (!buf)
1122                 return error("unable to load config blob object '%s'", name);
1123         if (type != OBJ_BLOB) {
1124                 free(buf);
1125                 return error("reference '%s' does not point to a blob", name);
1126         }
1127
1128         ret = git_config_from_buf(fn, name, buf, size, data);
1129         free(buf);
1130
1131         return ret;
1132 }
1133
1134 static int git_config_from_blob_ref(config_fn_t fn,
1135                                     const char *name,
1136                                     void *data)
1137 {
1138         unsigned char sha1[20];
1139
1140         if (get_sha1(name, sha1) < 0)
1141                 return error("unable to resolve config blob '%s'", name);
1142         return git_config_from_blob_sha1(fn, name, sha1, data);
1143 }
1144
1145 const char *git_etc_gitconfig(void)
1146 {
1147         static const char *system_wide;
1148         if (!system_wide)
1149                 system_wide = system_path(ETC_GITCONFIG);
1150         return system_wide;
1151 }
1152
1153 /*
1154  * Parse environment variable 'k' as a boolean (in various
1155  * possible spellings); if missing, use the default value 'def'.
1156  */
1157 int git_env_bool(const char *k, int def)
1158 {
1159         const char *v = getenv(k);
1160         return v ? git_config_bool(k, v) : def;
1161 }
1162
1163 /*
1164  * Parse environment variable 'k' as ulong with possibly a unit
1165  * suffix; if missing, use the default value 'val'.
1166  */
1167 unsigned long git_env_ulong(const char *k, unsigned long val)
1168 {
1169         const char *v = getenv(k);
1170         if (v && !git_parse_ulong(v, &val))
1171                 die("failed to parse %s", k);
1172         return val;
1173 }
1174
1175 int git_config_system(void)
1176 {
1177         return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
1178 }
1179
1180 int git_config_early(config_fn_t fn, void *data, const char *repo_config)
1181 {
1182         int ret = 0, found = 0;
1183         char *xdg_config = NULL;
1184         char *user_config = NULL;
1185
1186         home_config_paths(&user_config, &xdg_config, "config");
1187
1188         if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0)) {
1189                 ret += git_config_from_file(fn, git_etc_gitconfig(),
1190                                             data);
1191                 found += 1;
1192         }
1193
1194         if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK)) {
1195                 ret += git_config_from_file(fn, xdg_config, data);
1196                 found += 1;
1197         }
1198
1199         if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK)) {
1200                 ret += git_config_from_file(fn, user_config, data);
1201                 found += 1;
1202         }
1203
1204         if (repo_config && !access_or_die(repo_config, R_OK, 0)) {
1205                 ret += git_config_from_file(fn, repo_config, data);
1206                 found += 1;
1207         }
1208
1209         switch (git_config_from_parameters(fn, data)) {
1210         case -1: /* error */
1211                 die(_("unable to parse command-line config"));
1212                 break;
1213         case 0: /* found nothing */
1214                 break;
1215         default: /* found at least one item */
1216                 found++;
1217                 break;
1218         }
1219
1220         free(xdg_config);
1221         free(user_config);
1222         return ret == 0 ? found : ret;
1223 }
1224
1225 int git_config_with_options(config_fn_t fn, void *data,
1226                             struct git_config_source *config_source,
1227                             int respect_includes)
1228 {
1229         char *repo_config = NULL;
1230         int ret;
1231         struct config_include_data inc = CONFIG_INCLUDE_INIT;
1232
1233         if (respect_includes) {
1234                 inc.fn = fn;
1235                 inc.data = data;
1236                 fn = git_config_include;
1237                 data = &inc;
1238         }
1239
1240         /*
1241          * If we have a specific filename, use it. Otherwise, follow the
1242          * regular lookup sequence.
1243          */
1244         if (config_source && config_source->use_stdin)
1245                 return git_config_from_stdin(fn, data);
1246         else if (config_source && config_source->file)
1247                 return git_config_from_file(fn, config_source->file, data);
1248         else if (config_source && config_source->blob)
1249                 return git_config_from_blob_ref(fn, config_source->blob, data);
1250
1251         repo_config = git_pathdup("config");
1252         ret = git_config_early(fn, data, repo_config);
1253         if (repo_config)
1254                 free(repo_config);
1255         return ret;
1256 }
1257
1258 static void git_config_raw(config_fn_t fn, void *data)
1259 {
1260         if (git_config_with_options(fn, data, NULL, 1) < 0)
1261                 /*
1262                  * git_config_with_options() normally returns only
1263                  * positive values, as most errors are fatal, and
1264                  * non-fatal potential errors are guarded by "if"
1265                  * statements that are entered only when no error is
1266                  * possible.
1267                  *
1268                  * If we ever encounter a non-fatal error, it means
1269                  * something went really wrong and we should stop
1270                  * immediately.
1271                  */
1272                 die(_("unknown error occured while reading the configuration files"));
1273 }
1274
1275 static void configset_iter(struct config_set *cs, config_fn_t fn, void *data)
1276 {
1277         int i, value_index;
1278         struct string_list *values;
1279         struct config_set_element *entry;
1280         struct configset_list *list = &cs->list;
1281         struct key_value_info *kv_info;
1282
1283         for (i = 0; i < list->nr; i++) {
1284                 entry = list->items[i].e;
1285                 value_index = list->items[i].value_index;
1286                 values = &entry->value_list;
1287                 if (fn(entry->key, values->items[value_index].string, data) < 0) {
1288                         kv_info = values->items[value_index].util;
1289                         git_die_config_linenr(entry->key, kv_info->filename, kv_info->linenr);
1290                 }
1291         }
1292 }
1293
1294 static void git_config_check_init(void);
1295
1296 void git_config(config_fn_t fn, void *data)
1297 {
1298         git_config_check_init();
1299         configset_iter(&the_config_set, fn, data);
1300 }
1301
1302 static struct config_set_element *configset_find_element(struct config_set *cs, const char *key)
1303 {
1304         struct config_set_element k;
1305         struct config_set_element *found_entry;
1306         char *normalized_key;
1307         int ret;
1308         /*
1309          * `key` may come from the user, so normalize it before using it
1310          * for querying entries from the hashmap.
1311          */
1312         ret = git_config_parse_key(key, &normalized_key, NULL);
1313
1314         if (ret)
1315                 return NULL;
1316
1317         hashmap_entry_init(&k, strhash(normalized_key));
1318         k.key = normalized_key;
1319         found_entry = hashmap_get(&cs->config_hash, &k, NULL);
1320         free(normalized_key);
1321         return found_entry;
1322 }
1323
1324 static int configset_add_value(struct config_set *cs, const char *key, const char *value)
1325 {
1326         struct config_set_element *e;
1327         struct string_list_item *si;
1328         struct configset_list_item *l_item;
1329         struct key_value_info *kv_info = xmalloc(sizeof(*kv_info));
1330
1331         e = configset_find_element(cs, key);
1332         /*
1333          * Since the keys are being fed by git_config*() callback mechanism, they
1334          * are already normalized. So simply add them without any further munging.
1335          */
1336         if (!e) {
1337                 e = xmalloc(sizeof(*e));
1338                 hashmap_entry_init(e, strhash(key));
1339                 e->key = xstrdup(key);
1340                 string_list_init(&e->value_list, 1);
1341                 hashmap_add(&cs->config_hash, e);
1342         }
1343         si = string_list_append_nodup(&e->value_list, value ? xstrdup(value) : NULL);
1344
1345         ALLOC_GROW(cs->list.items, cs->list.nr + 1, cs->list.alloc);
1346         l_item = &cs->list.items[cs->list.nr++];
1347         l_item->e = e;
1348         l_item->value_index = e->value_list.nr - 1;
1349
1350         if (cf) {
1351                 kv_info->filename = strintern(cf->name);
1352                 kv_info->linenr = cf->linenr;
1353         } else {
1354                 /* for values read from `git_config_from_parameters()` */
1355                 kv_info->filename = NULL;
1356                 kv_info->linenr = -1;
1357         }
1358         si->util = kv_info;
1359
1360         return 0;
1361 }
1362
1363 static int config_set_element_cmp(const struct config_set_element *e1,
1364                                  const struct config_set_element *e2, const void *unused)
1365 {
1366         return strcmp(e1->key, e2->key);
1367 }
1368
1369 void git_configset_init(struct config_set *cs)
1370 {
1371         hashmap_init(&cs->config_hash, (hashmap_cmp_fn)config_set_element_cmp, 0);
1372         cs->hash_initialized = 1;
1373         cs->list.nr = 0;
1374         cs->list.alloc = 0;
1375         cs->list.items = NULL;
1376 }
1377
1378 void git_configset_clear(struct config_set *cs)
1379 {
1380         struct config_set_element *entry;
1381         struct hashmap_iter iter;
1382         if (!cs->hash_initialized)
1383                 return;
1384
1385         hashmap_iter_init(&cs->config_hash, &iter);
1386         while ((entry = hashmap_iter_next(&iter))) {
1387                 free(entry->key);
1388                 string_list_clear(&entry->value_list, 1);
1389         }
1390         hashmap_free(&cs->config_hash, 1);
1391         cs->hash_initialized = 0;
1392         free(cs->list.items);
1393         cs->list.nr = 0;
1394         cs->list.alloc = 0;
1395         cs->list.items = NULL;
1396 }
1397
1398 static int config_set_callback(const char *key, const char *value, void *cb)
1399 {
1400         struct config_set *cs = cb;
1401         configset_add_value(cs, key, value);
1402         return 0;
1403 }
1404
1405 int git_configset_add_file(struct config_set *cs, const char *filename)
1406 {
1407         return git_config_from_file(config_set_callback, filename, cs);
1408 }
1409
1410 int git_configset_get_value(struct config_set *cs, const char *key, const char **value)
1411 {
1412         const struct string_list *values = NULL;
1413         /*
1414          * Follows "last one wins" semantic, i.e., if there are multiple matches for the
1415          * queried key in the files of the configset, the value returned will be the last
1416          * value in the value list for that key.
1417          */
1418         values = git_configset_get_value_multi(cs, key);
1419
1420         if (!values)
1421                 return 1;
1422         assert(values->nr > 0);
1423         *value = values->items[values->nr - 1].string;
1424         return 0;
1425 }
1426
1427 const struct string_list *git_configset_get_value_multi(struct config_set *cs, const char *key)
1428 {
1429         struct config_set_element *e = configset_find_element(cs, key);
1430         return e ? &e->value_list : NULL;
1431 }
1432
1433 int git_configset_get_string_const(struct config_set *cs, const char *key, const char **dest)
1434 {
1435         const char *value;
1436         if (!git_configset_get_value(cs, key, &value))
1437                 return git_config_string(dest, key, value);
1438         else
1439                 return 1;
1440 }
1441
1442 int git_configset_get_string(struct config_set *cs, const char *key, char **dest)
1443 {
1444         return git_configset_get_string_const(cs, key, (const char **)dest);
1445 }
1446
1447 int git_configset_get_int(struct config_set *cs, const char *key, int *dest)
1448 {
1449         const char *value;
1450         if (!git_configset_get_value(cs, key, &value)) {
1451                 *dest = git_config_int(key, value);
1452                 return 0;
1453         } else
1454                 return 1;
1455 }
1456
1457 int git_configset_get_ulong(struct config_set *cs, const char *key, unsigned long *dest)
1458 {
1459         const char *value;
1460         if (!git_configset_get_value(cs, key, &value)) {
1461                 *dest = git_config_ulong(key, value);
1462                 return 0;
1463         } else
1464                 return 1;
1465 }
1466
1467 int git_configset_get_bool(struct config_set *cs, const char *key, int *dest)
1468 {
1469         const char *value;
1470         if (!git_configset_get_value(cs, key, &value)) {
1471                 *dest = git_config_bool(key, value);
1472                 return 0;
1473         } else
1474                 return 1;
1475 }
1476
1477 int git_configset_get_bool_or_int(struct config_set *cs, const char *key,
1478                                 int *is_bool, int *dest)
1479 {
1480         const char *value;
1481         if (!git_configset_get_value(cs, key, &value)) {
1482                 *dest = git_config_bool_or_int(key, value, is_bool);
1483                 return 0;
1484         } else
1485                 return 1;
1486 }
1487
1488 int git_configset_get_maybe_bool(struct config_set *cs, const char *key, int *dest)
1489 {
1490         const char *value;
1491         if (!git_configset_get_value(cs, key, &value)) {
1492                 *dest = git_config_maybe_bool(key, value);
1493                 if (*dest == -1)
1494                         return -1;
1495                 return 0;
1496         } else
1497                 return 1;
1498 }
1499
1500 int git_configset_get_pathname(struct config_set *cs, const char *key, const char **dest)
1501 {
1502         const char *value;
1503         if (!git_configset_get_value(cs, key, &value))
1504                 return git_config_pathname(dest, key, value);
1505         else
1506                 return 1;
1507 }
1508
1509 static void git_config_check_init(void)
1510 {
1511         if (the_config_set.hash_initialized)
1512                 return;
1513         git_configset_init(&the_config_set);
1514         git_config_raw(config_set_callback, &the_config_set);
1515 }
1516
1517 void git_config_clear(void)
1518 {
1519         if (!the_config_set.hash_initialized)
1520                 return;
1521         git_configset_clear(&the_config_set);
1522 }
1523
1524 int git_config_get_value(const char *key, const char **value)
1525 {
1526         git_config_check_init();
1527         return git_configset_get_value(&the_config_set, key, value);
1528 }
1529
1530 const struct string_list *git_config_get_value_multi(const char *key)
1531 {
1532         git_config_check_init();
1533         return git_configset_get_value_multi(&the_config_set, key);
1534 }
1535
1536 int git_config_get_string_const(const char *key, const char **dest)
1537 {
1538         int ret;
1539         git_config_check_init();
1540         ret = git_configset_get_string_const(&the_config_set, key, dest);
1541         if (ret < 0)
1542                 git_die_config(key, NULL);
1543         return ret;
1544 }
1545
1546 int git_config_get_string(const char *key, char **dest)
1547 {
1548         git_config_check_init();
1549         return git_config_get_string_const(key, (const char **)dest);
1550 }
1551
1552 int git_config_get_int(const char *key, int *dest)
1553 {
1554         git_config_check_init();
1555         return git_configset_get_int(&the_config_set, key, dest);
1556 }
1557
1558 int git_config_get_ulong(const char *key, unsigned long *dest)
1559 {
1560         git_config_check_init();
1561         return git_configset_get_ulong(&the_config_set, key, dest);
1562 }
1563
1564 int git_config_get_bool(const char *key, int *dest)
1565 {
1566         git_config_check_init();
1567         return git_configset_get_bool(&the_config_set, key, dest);
1568 }
1569
1570 int git_config_get_bool_or_int(const char *key, int *is_bool, int *dest)
1571 {
1572         git_config_check_init();
1573         return git_configset_get_bool_or_int(&the_config_set, key, is_bool, dest);
1574 }
1575
1576 int git_config_get_maybe_bool(const char *key, int *dest)
1577 {
1578         git_config_check_init();
1579         return git_configset_get_maybe_bool(&the_config_set, key, dest);
1580 }
1581
1582 int git_config_get_pathname(const char *key, const char **dest)
1583 {
1584         int ret;
1585         git_config_check_init();
1586         ret = git_configset_get_pathname(&the_config_set, key, dest);
1587         if (ret < 0)
1588                 git_die_config(key, NULL);
1589         return ret;
1590 }
1591
1592 NORETURN
1593 void git_die_config_linenr(const char *key, const char *filename, int linenr)
1594 {
1595         if (!filename)
1596                 die(_("unable to parse '%s' from command-line config"), key);
1597         else
1598                 die(_("bad config variable '%s' in file '%s' at line %d"),
1599                     key, filename, linenr);
1600 }
1601
1602 NORETURN __attribute__((format(printf, 2, 3)))
1603 void git_die_config(const char *key, const char *err, ...)
1604 {
1605         const struct string_list *values;
1606         struct key_value_info *kv_info;
1607
1608         if (err) {
1609                 va_list params;
1610                 va_start(params, err);
1611                 vreportf("error: ", err, params);
1612                 va_end(params);
1613         }
1614         values = git_config_get_value_multi(key);
1615         kv_info = values->items[values->nr - 1].util;
1616         git_die_config_linenr(key, kv_info->filename, kv_info->linenr);
1617 }
1618
1619 /*
1620  * Find all the stuff for git_config_set() below.
1621  */
1622
1623 static struct {
1624         int baselen;
1625         char *key;
1626         int do_not_match;
1627         regex_t *value_regex;
1628         int multi_replace;
1629         size_t *offset;
1630         unsigned int offset_alloc;
1631         enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1632         int seen;
1633 } store;
1634
1635 static int matches(const char *key, const char *value)
1636 {
1637         if (strcmp(key, store.key))
1638                 return 0; /* not ours */
1639         if (!store.value_regex)
1640                 return 1; /* always matches */
1641         if (store.value_regex == CONFIG_REGEX_NONE)
1642                 return 0; /* never matches */
1643
1644         return store.do_not_match ^
1645                 (value && !regexec(store.value_regex, value, 0, NULL, 0));
1646 }
1647
1648 static int store_aux(const char *key, const char *value, void *cb)
1649 {
1650         const char *ep;
1651         size_t section_len;
1652
1653         switch (store.state) {
1654         case KEY_SEEN:
1655                 if (matches(key, value)) {
1656                         if (store.seen == 1 && store.multi_replace == 0) {
1657                                 warning(_("%s has multiple values"), key);
1658                         }
1659
1660                         ALLOC_GROW(store.offset, store.seen + 1,
1661                                    store.offset_alloc);
1662
1663                         store.offset[store.seen] = cf->do_ftell(cf);
1664                         store.seen++;
1665                 }
1666                 break;
1667         case SECTION_SEEN:
1668                 /*
1669                  * What we are looking for is in store.key (both
1670                  * section and var), and its section part is baselen
1671                  * long.  We found key (again, both section and var).
1672                  * We would want to know if this key is in the same
1673                  * section as what we are looking for.  We already
1674                  * know we are in the same section as what should
1675                  * hold store.key.
1676                  */
1677                 ep = strrchr(key, '.');
1678                 section_len = ep - key;
1679
1680                 if ((section_len != store.baselen) ||
1681                     memcmp(key, store.key, section_len+1)) {
1682                         store.state = SECTION_END_SEEN;
1683                         break;
1684                 }
1685
1686                 /*
1687                  * Do not increment matches: this is no match, but we
1688                  * just made sure we are in the desired section.
1689                  */
1690                 ALLOC_GROW(store.offset, store.seen + 1,
1691                            store.offset_alloc);
1692                 store.offset[store.seen] = cf->do_ftell(cf);
1693                 /* fallthru */
1694         case SECTION_END_SEEN:
1695         case START:
1696                 if (matches(key, value)) {
1697                         ALLOC_GROW(store.offset, store.seen + 1,
1698                                    store.offset_alloc);
1699                         store.offset[store.seen] = cf->do_ftell(cf);
1700                         store.state = KEY_SEEN;
1701                         store.seen++;
1702                 } else {
1703                         if (strrchr(key, '.') - key == store.baselen &&
1704                               !strncmp(key, store.key, store.baselen)) {
1705                                         store.state = SECTION_SEEN;
1706                                         ALLOC_GROW(store.offset,
1707                                                    store.seen + 1,
1708                                                    store.offset_alloc);
1709                                         store.offset[store.seen] = cf->do_ftell(cf);
1710                         }
1711                 }
1712         }
1713         return 0;
1714 }
1715
1716 static int write_error(const char *filename)
1717 {
1718         error("failed to write new configuration file %s", filename);
1719
1720         /* Same error code as "failed to rename". */
1721         return 4;
1722 }
1723
1724 static int store_write_section(int fd, const char *key)
1725 {
1726         const char *dot;
1727         int i, success;
1728         struct strbuf sb = STRBUF_INIT;
1729
1730         dot = memchr(key, '.', store.baselen);
1731         if (dot) {
1732                 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1733                 for (i = dot - key + 1; i < store.baselen; i++) {
1734                         if (key[i] == '"' || key[i] == '\\')
1735                                 strbuf_addch(&sb, '\\');
1736                         strbuf_addch(&sb, key[i]);
1737                 }
1738                 strbuf_addstr(&sb, "\"]\n");
1739         } else {
1740                 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1741         }
1742
1743         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1744         strbuf_release(&sb);
1745
1746         return success;
1747 }
1748
1749 static int store_write_pair(int fd, const char *key, const char *value)
1750 {
1751         int i, success;
1752         int length = strlen(key + store.baselen + 1);
1753         const char *quote = "";
1754         struct strbuf sb = STRBUF_INIT;
1755
1756         /*
1757          * Check to see if the value needs to be surrounded with a dq pair.
1758          * Note that problematic characters are always backslash-quoted; this
1759          * check is about not losing leading or trailing SP and strings that
1760          * follow beginning-of-comment characters (i.e. ';' and '#') by the
1761          * configuration parser.
1762          */
1763         if (value[0] == ' ')
1764                 quote = "\"";
1765         for (i = 0; value[i]; i++)
1766                 if (value[i] == ';' || value[i] == '#')
1767                         quote = "\"";
1768         if (i && value[i - 1] == ' ')
1769                 quote = "\"";
1770
1771         strbuf_addf(&sb, "\t%.*s = %s",
1772                     length, key + store.baselen + 1, quote);
1773
1774         for (i = 0; value[i]; i++)
1775                 switch (value[i]) {
1776                 case '\n':
1777                         strbuf_addstr(&sb, "\\n");
1778                         break;
1779                 case '\t':
1780                         strbuf_addstr(&sb, "\\t");
1781                         break;
1782                 case '"':
1783                 case '\\':
1784                         strbuf_addch(&sb, '\\');
1785                 default:
1786                         strbuf_addch(&sb, value[i]);
1787                         break;
1788                 }
1789         strbuf_addf(&sb, "%s\n", quote);
1790
1791         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1792         strbuf_release(&sb);
1793
1794         return success;
1795 }
1796
1797 static ssize_t find_beginning_of_line(const char *contents, size_t size,
1798         size_t offset_, int *found_bracket)
1799 {
1800         size_t equal_offset = size, bracket_offset = size;
1801         ssize_t offset;
1802
1803 contline:
1804         for (offset = offset_-2; offset > 0
1805                         && contents[offset] != '\n'; offset--)
1806                 switch (contents[offset]) {
1807                         case '=': equal_offset = offset; break;
1808                         case ']': bracket_offset = offset; break;
1809                 }
1810         if (offset > 0 && contents[offset-1] == '\\') {
1811                 offset_ = offset;
1812                 goto contline;
1813         }
1814         if (bracket_offset < equal_offset) {
1815                 *found_bracket = 1;
1816                 offset = bracket_offset+1;
1817         } else
1818                 offset++;
1819
1820         return offset;
1821 }
1822
1823 int git_config_set_in_file(const char *config_filename,
1824                         const char *key, const char *value)
1825 {
1826         return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1827 }
1828
1829 int git_config_set(const char *key, const char *value)
1830 {
1831         return git_config_set_multivar(key, value, NULL, 0);
1832 }
1833
1834 /*
1835  * Auxiliary function to sanity-check and split the key into the section
1836  * identifier and variable name.
1837  *
1838  * Returns 0 on success, -1 when there is an invalid character in the key and
1839  * -2 if there is no section name in the key.
1840  *
1841  * store_key - pointer to char* which will hold a copy of the key with
1842  *             lowercase section and variable name
1843  * baselen - pointer to int which will hold the length of the
1844  *           section + subsection part, can be NULL
1845  */
1846 int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1847 {
1848         int i, dot, baselen;
1849         const char *last_dot = strrchr(key, '.');
1850
1851         /*
1852          * Since "key" actually contains the section name and the real
1853          * key name separated by a dot, we have to know where the dot is.
1854          */
1855
1856         if (last_dot == NULL || last_dot == key) {
1857                 error("key does not contain a section: %s", key);
1858                 return -CONFIG_NO_SECTION_OR_NAME;
1859         }
1860
1861         if (!last_dot[1]) {
1862                 error("key does not contain variable name: %s", key);
1863                 return -CONFIG_NO_SECTION_OR_NAME;
1864         }
1865
1866         baselen = last_dot - key;
1867         if (baselen_)
1868                 *baselen_ = baselen;
1869
1870         /*
1871          * Validate the key and while at it, lower case it for matching.
1872          */
1873         *store_key = xmalloc(strlen(key) + 1);
1874
1875         dot = 0;
1876         for (i = 0; key[i]; i++) {
1877                 unsigned char c = key[i];
1878                 if (c == '.')
1879                         dot = 1;
1880                 /* Leave the extended basename untouched.. */
1881                 if (!dot || i > baselen) {
1882                         if (!iskeychar(c) ||
1883                             (i == baselen + 1 && !isalpha(c))) {
1884                                 error("invalid key: %s", key);
1885                                 goto out_free_ret_1;
1886                         }
1887                         c = tolower(c);
1888                 } else if (c == '\n') {
1889                         error("invalid key (newline): %s", key);
1890                         goto out_free_ret_1;
1891                 }
1892                 (*store_key)[i] = c;
1893         }
1894         (*store_key)[i] = 0;
1895
1896         return 0;
1897
1898 out_free_ret_1:
1899         free(*store_key);
1900         *store_key = NULL;
1901         return -CONFIG_INVALID_KEY;
1902 }
1903
1904 /*
1905  * If value==NULL, unset in (remove from) config,
1906  * if value_regex!=NULL, disregard key/value pairs where value does not match.
1907  * if value_regex==CONFIG_REGEX_NONE, do not match any existing values
1908  *     (only add a new one)
1909  * if multi_replace==0, nothing, or only one matching key/value is replaced,
1910  *     else all matching key/values (regardless how many) are removed,
1911  *     before the new pair is written.
1912  *
1913  * Returns 0 on success.
1914  *
1915  * This function does this:
1916  *
1917  * - it locks the config file by creating ".git/config.lock"
1918  *
1919  * - it then parses the config using store_aux() as validator to find
1920  *   the position on the key/value pair to replace. If it is to be unset,
1921  *   it must be found exactly once.
1922  *
1923  * - the config file is mmap()ed and the part before the match (if any) is
1924  *   written to the lock file, then the changed part and the rest.
1925  *
1926  * - the config file is removed and the lock file rename()d to it.
1927  *
1928  */
1929 int git_config_set_multivar_in_file(const char *config_filename,
1930                                 const char *key, const char *value,
1931                                 const char *value_regex, int multi_replace)
1932 {
1933         int fd = -1, in_fd;
1934         int ret;
1935         struct lock_file *lock = NULL;
1936         char *filename_buf = NULL;
1937
1938         /* parse-key returns negative; flip the sign to feed exit(3) */
1939         ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1940         if (ret)
1941                 goto out_free;
1942
1943         store.multi_replace = multi_replace;
1944
1945         if (!config_filename)
1946                 config_filename = filename_buf = git_pathdup("config");
1947
1948         /*
1949          * The lock serves a purpose in addition to locking: the new
1950          * contents of .git/config will be written into it.
1951          */
1952         lock = xcalloc(1, sizeof(struct lock_file));
1953         fd = hold_lock_file_for_update(lock, config_filename, 0);
1954         if (fd < 0) {
1955                 error("could not lock config file %s: %s", config_filename, strerror(errno));
1956                 free(store.key);
1957                 ret = CONFIG_NO_LOCK;
1958                 goto out_free;
1959         }
1960
1961         /*
1962          * If .git/config does not exist yet, write a minimal version.
1963          */
1964         in_fd = open(config_filename, O_RDONLY);
1965         if ( in_fd < 0 ) {
1966                 free(store.key);
1967
1968                 if ( ENOENT != errno ) {
1969                         error("opening %s: %s", config_filename,
1970                               strerror(errno));
1971                         ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1972                         goto out_free;
1973                 }
1974                 /* if nothing to unset, error out */
1975                 if (value == NULL) {
1976                         ret = CONFIG_NOTHING_SET;
1977                         goto out_free;
1978                 }
1979
1980                 store.key = (char *)key;
1981                 if (!store_write_section(fd, key) ||
1982                     !store_write_pair(fd, key, value))
1983                         goto write_err_out;
1984         } else {
1985                 struct stat st;
1986                 char *contents;
1987                 size_t contents_sz, copy_begin, copy_end;
1988                 int i, new_line = 0;
1989
1990                 if (value_regex == NULL)
1991                         store.value_regex = NULL;
1992                 else if (value_regex == CONFIG_REGEX_NONE)
1993                         store.value_regex = CONFIG_REGEX_NONE;
1994                 else {
1995                         if (value_regex[0] == '!') {
1996                                 store.do_not_match = 1;
1997                                 value_regex++;
1998                         } else
1999                                 store.do_not_match = 0;
2000
2001                         store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
2002                         if (regcomp(store.value_regex, value_regex,
2003                                         REG_EXTENDED)) {
2004                                 error("invalid pattern: %s", value_regex);
2005                                 free(store.value_regex);
2006                                 ret = CONFIG_INVALID_PATTERN;
2007                                 goto out_free;
2008                         }
2009                 }
2010
2011                 ALLOC_GROW(store.offset, 1, store.offset_alloc);
2012                 store.offset[0] = 0;
2013                 store.state = START;
2014                 store.seen = 0;
2015
2016                 /*
2017                  * After this, store.offset will contain the *end* offset
2018                  * of the last match, or remain at 0 if no match was found.
2019                  * As a side effect, we make sure to transform only a valid
2020                  * existing config file.
2021                  */
2022                 if (git_config_from_file(store_aux, config_filename, NULL)) {
2023                         error("invalid config file %s", config_filename);
2024                         free(store.key);
2025                         if (store.value_regex != NULL &&
2026                             store.value_regex != CONFIG_REGEX_NONE) {
2027                                 regfree(store.value_regex);
2028                                 free(store.value_regex);
2029                         }
2030                         ret = CONFIG_INVALID_FILE;
2031                         goto out_free;
2032                 }
2033
2034                 free(store.key);
2035                 if (store.value_regex != NULL &&
2036                     store.value_regex != CONFIG_REGEX_NONE) {
2037                         regfree(store.value_regex);
2038                         free(store.value_regex);
2039                 }
2040
2041                 /* if nothing to unset, or too many matches, error out */
2042                 if ((store.seen == 0 && value == NULL) ||
2043                                 (store.seen > 1 && multi_replace == 0)) {
2044                         ret = CONFIG_NOTHING_SET;
2045                         goto out_free;
2046                 }
2047
2048                 fstat(in_fd, &st);
2049                 contents_sz = xsize_t(st.st_size);
2050                 contents = xmmap(NULL, contents_sz, PROT_READ,
2051                         MAP_PRIVATE, in_fd, 0);
2052                 close(in_fd);
2053
2054                 if (chmod(lock->filename.buf, st.st_mode & 07777) < 0) {
2055                         error("chmod on %s failed: %s",
2056                                 lock->filename.buf, strerror(errno));
2057                         ret = CONFIG_NO_WRITE;
2058                         goto out_free;
2059                 }
2060
2061                 if (store.seen == 0)
2062                         store.seen = 1;
2063
2064                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
2065                         if (store.offset[i] == 0) {
2066                                 store.offset[i] = copy_end = contents_sz;
2067                         } else if (store.state != KEY_SEEN) {
2068                                 copy_end = store.offset[i];
2069                         } else
2070                                 copy_end = find_beginning_of_line(
2071                                         contents, contents_sz,
2072                                         store.offset[i]-2, &new_line);
2073
2074                         if (copy_end > 0 && contents[copy_end-1] != '\n')
2075                                 new_line = 1;
2076
2077                         /* write the first part of the config */
2078                         if (copy_end > copy_begin) {
2079                                 if (write_in_full(fd, contents + copy_begin,
2080                                                   copy_end - copy_begin) <
2081                                     copy_end - copy_begin)
2082                                         goto write_err_out;
2083                                 if (new_line &&
2084                                     write_str_in_full(fd, "\n") != 1)
2085                                         goto write_err_out;
2086                         }
2087                         copy_begin = store.offset[i];
2088                 }
2089
2090                 /* write the pair (value == NULL means unset) */
2091                 if (value != NULL) {
2092                         if (store.state == START) {
2093                                 if (!store_write_section(fd, key))
2094                                         goto write_err_out;
2095                         }
2096                         if (!store_write_pair(fd, key, value))
2097                                 goto write_err_out;
2098                 }
2099
2100                 /* write the rest of the config */
2101                 if (copy_begin < contents_sz)
2102                         if (write_in_full(fd, contents + copy_begin,
2103                                           contents_sz - copy_begin) <
2104                             contents_sz - copy_begin)
2105                                 goto write_err_out;
2106
2107                 munmap(contents, contents_sz);
2108         }
2109
2110         if (commit_lock_file(lock) < 0) {
2111                 error("could not commit config file %s", config_filename);
2112                 ret = CONFIG_NO_WRITE;
2113                 lock = NULL;
2114                 goto out_free;
2115         }
2116
2117         /*
2118          * lock is committed, so don't try to roll it back below.
2119          * NOTE: Since lockfile.c keeps a linked list of all created
2120          * lock_file structures, it isn't safe to free(lock).  It's
2121          * better to just leave it hanging around.
2122          */
2123         lock = NULL;
2124         ret = 0;
2125
2126         /* Invalidate the config cache */
2127         git_config_clear();
2128
2129 out_free:
2130         if (lock)
2131                 rollback_lock_file(lock);
2132         free(filename_buf);
2133         return ret;
2134
2135 write_err_out:
2136         ret = write_error(lock->filename.buf);
2137         goto out_free;
2138
2139 }
2140
2141 int git_config_set_multivar(const char *key, const char *value,
2142                         const char *value_regex, int multi_replace)
2143 {
2144         return git_config_set_multivar_in_file(NULL, key, value, value_regex,
2145                                                multi_replace);
2146 }
2147
2148 static int section_name_match (const char *buf, const char *name)
2149 {
2150         int i = 0, j = 0, dot = 0;
2151         if (buf[i] != '[')
2152                 return 0;
2153         for (i = 1; buf[i] && buf[i] != ']'; i++) {
2154                 if (!dot && isspace(buf[i])) {
2155                         dot = 1;
2156                         if (name[j++] != '.')
2157                                 break;
2158                         for (i++; isspace(buf[i]); i++)
2159                                 ; /* do nothing */
2160                         if (buf[i] != '"')
2161                                 break;
2162                         continue;
2163                 }
2164                 if (buf[i] == '\\' && dot)
2165                         i++;
2166                 else if (buf[i] == '"' && dot) {
2167                         for (i++; isspace(buf[i]); i++)
2168                                 ; /* do_nothing */
2169                         break;
2170                 }
2171                 if (buf[i] != name[j++])
2172                         break;
2173         }
2174         if (buf[i] == ']' && name[j] == 0) {
2175                 /*
2176                  * We match, now just find the right length offset by
2177                  * gobbling up any whitespace after it, as well
2178                  */
2179                 i++;
2180                 for (; buf[i] && isspace(buf[i]); i++)
2181                         ; /* do nothing */
2182                 return i;
2183         }
2184         return 0;
2185 }
2186
2187 static int section_name_is_ok(const char *name)
2188 {
2189         /* Empty section names are bogus. */
2190         if (!*name)
2191                 return 0;
2192
2193         /*
2194          * Before a dot, we must be alphanumeric or dash. After the first dot,
2195          * anything goes, so we can stop checking.
2196          */
2197         for (; *name && *name != '.'; name++)
2198                 if (*name != '-' && !isalnum(*name))
2199                         return 0;
2200         return 1;
2201 }
2202
2203 /* if new_name == NULL, the section is removed instead */
2204 int git_config_rename_section_in_file(const char *config_filename,
2205                                       const char *old_name, const char *new_name)
2206 {
2207         int ret = 0, remove = 0;
2208         char *filename_buf = NULL;
2209         struct lock_file *lock;
2210         int out_fd;
2211         char buf[1024];
2212         FILE *config_file;
2213         struct stat st;
2214
2215         if (new_name && !section_name_is_ok(new_name)) {
2216                 ret = error("invalid section name: %s", new_name);
2217                 goto out;
2218         }
2219
2220         if (!config_filename)
2221                 config_filename = filename_buf = git_pathdup("config");
2222
2223         lock = xcalloc(1, sizeof(struct lock_file));
2224         out_fd = hold_lock_file_for_update(lock, config_filename, 0);
2225         if (out_fd < 0) {
2226                 ret = error("could not lock config file %s", config_filename);
2227                 goto out;
2228         }
2229
2230         if (!(config_file = fopen(config_filename, "rb"))) {
2231                 /* no config file means nothing to rename, no error */
2232                 goto unlock_and_out;
2233         }
2234
2235         fstat(fileno(config_file), &st);
2236
2237         if (chmod(lock->filename.buf, st.st_mode & 07777) < 0) {
2238                 ret = error("chmod on %s failed: %s",
2239                                 lock->filename.buf, strerror(errno));
2240                 goto out;
2241         }
2242
2243         while (fgets(buf, sizeof(buf), config_file)) {
2244                 int i;
2245                 int length;
2246                 char *output = buf;
2247                 for (i = 0; buf[i] && isspace(buf[i]); i++)
2248                         ; /* do nothing */
2249                 if (buf[i] == '[') {
2250                         /* it's a section */
2251                         int offset = section_name_match(&buf[i], old_name);
2252                         if (offset > 0) {
2253                                 ret++;
2254                                 if (new_name == NULL) {
2255                                         remove = 1;
2256                                         continue;
2257                                 }
2258                                 store.baselen = strlen(new_name);
2259                                 if (!store_write_section(out_fd, new_name)) {
2260                                         ret = write_error(lock->filename.buf);
2261                                         goto out;
2262                                 }
2263                                 /*
2264                                  * We wrote out the new section, with
2265                                  * a newline, now skip the old
2266                                  * section's length
2267                                  */
2268                                 output += offset + i;
2269                                 if (strlen(output) > 0) {
2270                                         /*
2271                                          * More content means there's
2272                                          * a declaration to put on the
2273                                          * next line; indent with a
2274                                          * tab
2275                                          */
2276                                         output -= 1;
2277                                         output[0] = '\t';
2278                                 }
2279                         }
2280                         remove = 0;
2281                 }
2282                 if (remove)
2283                         continue;
2284                 length = strlen(output);
2285                 if (write_in_full(out_fd, output, length) != length) {
2286                         ret = write_error(lock->filename.buf);
2287                         goto out;
2288                 }
2289         }
2290         fclose(config_file);
2291 unlock_and_out:
2292         if (commit_lock_file(lock) < 0)
2293                 ret = error("could not commit config file %s", config_filename);
2294 out:
2295         free(filename_buf);
2296         return ret;
2297 }
2298
2299 int git_config_rename_section(const char *old_name, const char *new_name)
2300 {
2301         return git_config_rename_section_in_file(NULL, old_name, new_name);
2302 }
2303
2304 /*
2305  * Call this to report error for your variable that should not
2306  * get a boolean value (i.e. "[my] var" means "true").
2307  */
2308 #undef config_error_nonbool
2309 int config_error_nonbool(const char *var)
2310 {
2311         return error("Missing value for '%s'", var);
2312 }
2313
2314 int parse_config_key(const char *var,
2315                      const char *section,
2316                      const char **subsection, int *subsection_len,
2317                      const char **key)
2318 {
2319         int section_len = strlen(section);
2320         const char *dot;
2321
2322         /* Does it start with "section." ? */
2323         if (!starts_with(var, section) || var[section_len] != '.')
2324                 return -1;
2325
2326         /*
2327          * Find the key; we don't know yet if we have a subsection, but we must
2328          * parse backwards from the end, since the subsection may have dots in
2329          * it, too.
2330          */
2331         dot = strrchr(var, '.');
2332         *key = dot + 1;
2333
2334         /* Did we have a subsection at all? */
2335         if (dot == var + section_len) {
2336                 *subsection = NULL;
2337                 *subsection_len = 0;
2338         }
2339         else {
2340                 *subsection = var + section_len + 1;
2341                 *subsection_len = dot - *subsection;
2342         }
2343
2344         return 0;
2345 }