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         } u;
  18         const char *name;
  19         int linenr;
  20         int eof;
  21         struct strbuf value;
  22         struct strbuf var;
  23
  24         int (*fgetc)(struct config_source *c);
  25         int (*ungetc)(int c, struct config_source *conf);
  26         long (*ftell)(struct config_source *c);
  27 };
  28
  29 static struct config_source *cf;
  30
  31 static int zlib_compression_seen;
  32
  33 static int config_file_fgetc(struct config_source *conf)
  34 {
  35         return fgetc(conf->u.file);
  36 }
  37
  38 static int config_file_ungetc(int c, struct config_source *conf)
  39 {
  40         return ungetc(c, conf->u.file);
  41 }
  42
  43 static long config_file_ftell(struct config_source *conf)
  44 {
  45         return ftell(conf->u.file);
  46 }
  47
  48 #define MAX_INCLUDE_DEPTH 10
  49 static const char include_depth_advice[] =
  50 "exceeded maximum include depth (%d) while including\n"
  51 "       %s\n"
  52 "from\n"
  53 "       %s\n"
  54 "Do you have circular includes?";
  55 static int handle_path_include(const char *path, struct config_include_data *inc)
  56 {
  57         int ret = 0;
  58         struct strbuf buf = STRBUF_INIT;
  59         char *expanded = expand_user_path(path);
  60
  61         if (!expanded)
  62                 return error("Could not expand include path '%s'", path);
  63         path = expanded;
  64
  65         /*
  66          * Use an absolute path as-is, but interpret relative paths
  67          * based on the including config file.
  68          */
  69         if (!is_absolute_path(path)) {
  70                 char *slash;
  71
  72                 if (!cf || !cf->name)
  73                         return error("relative config includes must come from files");
  74
  75                 slash = find_last_dir_sep(cf->name);
  76                 if (slash)
  77                         strbuf_add(&buf, cf->name, slash - cf->name + 1);
  78                 strbuf_addstr(&buf, path);
  79                 path = buf.buf;
  80         }
  81
  82         if (!access_or_die(path, R_OK)) {
  83                 if (++inc->depth > MAX_INCLUDE_DEPTH)
  84                         die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
  85                             cf && cf->name ? cf->name : "the command line");
  86                 ret = git_config_from_file(git_config_include, path, inc);
  87                 inc->depth--;
  88         }
  89         strbuf_release(&buf);
  90         free(expanded);
  91         return ret;
  92 }
  93
  94 int git_config_include(const char *var, const char *value, void *data)
  95 {
  96         struct config_include_data *inc = data;
  97         const char *type;
  98         int ret;
  99
 100         /*
 101          * Pass along all values, including "include" directives; this makes it
 102          * possible to query information on the includes themselves.
 103          */
 104         ret = inc->fn(var, value, inc->data);
 105         if (ret < 0)
 106                 return ret;
 107
 108         type = skip_prefix(var, "include.");
 109         if (!type)
 110                 return ret;
 111
 112         if (!strcmp(type, "path"))
 113                 ret = handle_path_include(value, inc);
 114         return ret;
 115 }
 116
 117 static void lowercase(char *p)
 118 {
 119         for (; *p; p++)
 120                 *p = tolower(*p);
 121 }
 122
 123 void git_config_push_parameter(const char *text)
 124 {
 125         struct strbuf env = STRBUF_INIT;
 126         const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
 127         if (old) {
 128                 strbuf_addstr(&env, old);
 129                 strbuf_addch(&env, ' ');
 130         }
 131         sq_quote_buf(&env, text);
 132         setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
 133         strbuf_release(&env);
 134 }
 135
 136 int git_config_parse_parameter(const char *text,
 137                                config_fn_t fn, void *data)
 138 {
 139         struct strbuf **pair;
 140         pair = strbuf_split_str(text, '=', 2);
 141         if (!pair[0])
 142                 return error("bogus config parameter: %s", text);
 143         if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
 144                 strbuf_setlen(pair[0], pair[0]->len - 1);
 145         strbuf_trim(pair[0]);
 146         if (!pair[0]->len) {
 147                 strbuf_list_free(pair);
 148                 return error("bogus config parameter: %s", text);
 149         }
 150         lowercase(pair[0]->buf);
 151         if (fn(pair[0]->buf, pair[1] ? pair[1]->buf : NULL, data) < 0) {
 152                 strbuf_list_free(pair);
 153                 return -1;
 154         }
 155         strbuf_list_free(pair);
 156         return 0;
 157 }
 158
 159 int git_config_from_parameters(config_fn_t fn, void *data)
 160 {
 161         const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 162         char *envw;
 163         const char **argv = NULL;
 164         int nr = 0, alloc = 0;
 165         int i;
 166
 167         if (!env)
 168                 return 0;
 169         /* sq_dequote will write over it */
 170         envw = xstrdup(env);
 171
 172         if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 173                 free(envw);
 174                 return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
 175         }
 176
 177         for (i = 0; i < nr; i++) {
 178                 if (git_config_parse_parameter(argv[i], fn, data) < 0) {
 179                         free(argv);
 180                         free(envw);
 181                         return -1;
 182                 }
 183         }
 184
 185         free(argv);
 186         free(envw);
 187         return nr > 0;
 188 }
 189
 190 static int get_next_char(void)
 191 {
 192         int c = cf->fgetc(cf);
 193
 194         if (c == '\r') {
 195                 /* DOS like systems */
 196                 c = cf->fgetc(cf);
 197                 if (c != '\n') {
 198                         cf->ungetc(c, cf);
 199                         c = '\r';
 200                 }
 201         }
 202         if (c == '\n')
 203                 cf->linenr++;
 204         if (c == EOF) {
 205                 cf->eof = 1;
 206                 c = '\n';
 207         }
 208         return c;
 209 }
 210
 211 static char *parse_value(void)
 212 {
 213         int quote = 0, comment = 0, space = 0;
 214
 215         strbuf_reset(&cf->value);
 216         for (;;) {
 217                 int c = get_next_char();
 218                 if (c == '\n') {
 219                         if (quote) {
 220                                 cf->linenr--;
 221                                 return NULL;
 222                         }
 223                         return cf->value.buf;
 224                 }
 225                 if (comment)
 226                         continue;
 227                 if (isspace(c) && !quote) {
 228                         if (cf->value.len)
 229                                 space++;
 230                         continue;
 231                 }
 232                 if (!quote) {
 233                         if (c == ';' || c == '#') {
 234                                 comment = 1;
 235                                 continue;
 236                         }
 237                 }
 238                 for (; space; space--)
 239                         strbuf_addch(&cf->value, ' ');
 240                 if (c == '\\') {
 241                         c = get_next_char();
 242                         switch (c) {
 243                         case '\n':
 244                                 continue;
 245                         case 't':
 246                                 c = '\t';
 247                                 break;
 248                         case 'b':
 249                                 c = '\b';
 250                                 break;
 251                         case 'n':
 252                                 c = '\n';
 253                                 break;
 254                         /* Some characters escape as themselves */
 255                         case '\\': case '"':
 256                                 break;
 257                         /* Reject unknown escape sequences */
 258                         default:
 259                                 return NULL;
 260                         }
 261                         strbuf_addch(&cf->value, c);
 262                         continue;
 263                 }
 264                 if (c == '"') {
 265                         quote = 1-quote;
 266                         continue;
 267                 }
 268                 strbuf_addch(&cf->value, c);
 269         }
 270 }
 271
 272 static inline int iskeychar(int c)
 273 {
 274         return isalnum(c) || c == '-';
 275 }
 276
 277 static int get_value(config_fn_t fn, void *data, struct strbuf *name)
 278 {
 279         int c;
 280         char *value;
 281
 282         /* Get the full name */
 283         for (;;) {
 284                 c = get_next_char();
 285                 if (cf->eof)
 286                         break;
 287                 if (!iskeychar(c))
 288                         break;
 289                 strbuf_addch(name, tolower(c));
 290         }
 291
 292         while (c == ' ' || c == '\t')
 293                 c = get_next_char();
 294
 295         value = NULL;
 296         if (c != '\n') {
 297                 if (c != '=')
 298                         return -1;
 299                 value = parse_value();
 300                 if (!value)
 301                         return -1;
 302         }
 303         return fn(name->buf, value, data);
 304 }
 305
 306 static int get_extended_base_var(struct strbuf *name, int c)
 307 {
 308         do {
 309                 if (c == '\n')
 310                         goto error_incomplete_line;
 311                 c = get_next_char();
 312         } while (isspace(c));
 313
 314         /* We require the format to be '[base "extension"]' */
 315         if (c != '"')
 316                 return -1;
 317         strbuf_addch(name, '.');
 318
 319         for (;;) {
 320                 int c = get_next_char();
 321                 if (c == '\n')
 322                         goto error_incomplete_line;
 323                 if (c == '"')
 324                         break;
 325                 if (c == '\\') {
 326                         c = get_next_char();
 327                         if (c == '\n')
 328                                 goto error_incomplete_line;
 329                 }
 330                 strbuf_addch(name, c);
 331         }
 332
 333         /* Final ']' */
 334         if (get_next_char() != ']')
 335                 return -1;
 336         return 0;
 337 error_incomplete_line:
 338         cf->linenr--;
 339         return -1;
 340 }
 341
 342 static int get_base_var(struct strbuf *name)
 343 {
 344         for (;;) {
 345                 int c = get_next_char();
 346                 if (cf->eof)
 347                         return -1;
 348                 if (c == ']')
 349                         return 0;
 350                 if (isspace(c))
 351                         return get_extended_base_var(name, c);
 352                 if (!iskeychar(c) && c != '.')
 353                         return -1;
 354                 strbuf_addch(name, tolower(c));
 355         }
 356 }
 357
 358 static int git_parse_source(config_fn_t fn, void *data)
 359 {
 360         int comment = 0;
 361         int baselen = 0;
 362         struct strbuf *var = &cf->var;
 363
 364         /* U+FEFF Byte Order Mark in UTF8 */
 365         static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 366         const unsigned char *bomptr = utf8_bom;
 367
 368         for (;;) {
 369                 int c = get_next_char();
 370                 if (bomptr && *bomptr) {
 371                         /* We are at the file beginning; skip UTF8-encoded BOM
 372                          * if present. Sane editors won't put this in on their
 373                          * own, but e.g. Windows Notepad will do it happily. */
 374                         if ((unsigned char) c == *bomptr) {
 375                                 bomptr++;
 376                                 continue;
 377                         } else {
 378                                 /* Do not tolerate partial BOM. */
 379                                 if (bomptr != utf8_bom)
 380                                         break;
 381                                 /* No BOM at file beginning. Cool. */
 382                                 bomptr = NULL;
 383                         }
 384                 }
 385                 if (c == '\n') {
 386                         if (cf->eof)
 387                                 return 0;
 388                         comment = 0;
 389                         continue;
 390                 }
 391                 if (comment || isspace(c))
 392                         continue;
 393                 if (c == '#' || c == ';') {
 394                         comment = 1;
 395                         continue;
 396                 }
 397                 if (c == '[') {
 398                         /* Reset prior to determining a new stem */
 399                         strbuf_reset(var);
 400                         if (get_base_var(var) < 0 || var->len < 1)
 401                                 break;
 402                         strbuf_addch(var, '.');
 403                         baselen = var->len;
 404                         continue;
 405                 }
 406                 if (!isalpha(c))
 407                         break;
 408                 /*
 409                  * Truncate the var name back to the section header
 410                  * stem prior to grabbing the suffix part of the name
 411                  * and the value.
 412                  */
 413                 strbuf_setlen(var, baselen);
 414                 strbuf_addch(var, tolower(c));
 415                 if (get_value(fn, data, var) < 0)
 416                         break;
 417         }
 418         die("bad config file line %d in %s", cf->linenr, cf->name);
 419 }
 420
 421 static int parse_unit_factor(const char *end, uintmax_t *val)
 422 {
 423         if (!*end)
 424                 return 1;
 425         else if (!strcasecmp(end, "k")) {
 426                 *val *= 1024;
 427                 return 1;
 428         }
 429         else if (!strcasecmp(end, "m")) {
 430                 *val *= 1024 * 1024;
 431                 return 1;
 432         }
 433         else if (!strcasecmp(end, "g")) {
 434                 *val *= 1024 * 1024 * 1024;
 435                 return 1;
 436         }
 437         return 0;
 438 }
 439
 440 static int git_parse_long(const char *value, long *ret)
 441 {
 442         if (value && *value) {
 443                 char *end;
 444                 intmax_t val;
 445                 uintmax_t uval;
 446                 uintmax_t factor = 1;
 447
 448                 errno = 0;
 449                 val = strtoimax(value, &end, 0);
 450                 if (errno == ERANGE)
 451                         return 0;
 452                 if (!parse_unit_factor(end, &factor))
 453                         return 0;
 454                 uval = abs(val);
 455                 uval *= factor;
 456                 if ((uval > maximum_signed_value_of_type(long)) ||
 457                     (abs(val) > uval))
 458                         return 0;
 459                 val *= factor;
 460                 *ret = val;
 461                 return 1;
 462         }
 463         return 0;
 464 }
 465
 466 int git_parse_ulong(const char *value, unsigned long *ret)
 467 {
 468         if (value && *value) {
 469                 char *end;
 470                 uintmax_t val;
 471                 uintmax_t oldval;
 472
 473                 errno = 0;
 474                 val = strtoumax(value, &end, 0);
 475                 if (errno == ERANGE)
 476                         return 0;
 477                 oldval = val;
 478                 if (!parse_unit_factor(end, &val))
 479                         return 0;
 480                 if ((val > maximum_unsigned_value_of_type(long)) ||
 481                     (oldval > val))
 482                         return 0;
 483                 *ret = val;
 484                 return 1;
 485         }
 486         return 0;
 487 }
 488
 489 static void die_bad_config(const char *name)
 490 {
 491         if (cf && cf->name)
 492                 die("bad config value for '%s' in %s", name, cf->name);
 493         die("bad config value for '%s'", name);
 494 }
 495
 496 int git_config_int(const char *name, const char *value)
 497 {
 498         long ret = 0;
 499         if (!git_parse_long(value, &ret))
 500                 die_bad_config(name);
 501         return ret;
 502 }
 503
 504 unsigned long git_config_ulong(const char *name, const char *value)
 505 {
 506         unsigned long ret;
 507         if (!git_parse_ulong(value, &ret))
 508                 die_bad_config(name);
 509         return ret;
 510 }
 511
 512 static int git_config_maybe_bool_text(const char *name, const char *value)
 513 {
 514         if (!value)
 515                 return 1;
 516         if (!*value)
 517                 return 0;
 518         if (!strcasecmp(value, "true")
 519             || !strcasecmp(value, "yes")
 520             || !strcasecmp(value, "on"))
 521                 return 1;
 522         if (!strcasecmp(value, "false")
 523             || !strcasecmp(value, "no")
 524             || !strcasecmp(value, "off"))
 525                 return 0;
 526         return -1;
 527 }
 528
 529 int git_config_maybe_bool(const char *name, const char *value)
 530 {
 531         long v = git_config_maybe_bool_text(name, value);
 532         if (0 <= v)
 533                 return v;
 534         if (git_parse_long(value, &v))
 535                 return !!v;
 536         return -1;
 537 }
 538
 539 int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 540 {
 541         int v = git_config_maybe_bool_text(name, value);
 542         if (0 <= v) {
 543                 *is_bool = 1;
 544                 return v;
 545         }
 546         *is_bool = 0;
 547         return git_config_int(name, value);
 548 }
 549
 550 int git_config_bool(const char *name, const char *value)
 551 {
 552         int discard;
 553         return !!git_config_bool_or_int(name, value, &discard);
 554 }
 555
 556 int git_config_string(const char **dest, const char *var, const char *value)
 557 {
 558         if (!value)
 559                 return config_error_nonbool(var);
 560         *dest = xstrdup(value);
 561         return 0;
 562 }
 563
 564 int git_config_pathname(const char **dest, const char *var, const char *value)
 565 {
 566         if (!value)
 567                 return config_error_nonbool(var);
 568         *dest = expand_user_path(value);
 569         if (!*dest)
 570                 die("Failed to expand user dir in: '%s'", value);
 571         return 0;
 572 }
 573
 574 static int git_default_core_config(const char *var, const char *value)
 575 {
 576         /* This needs a better name */
 577         if (!strcmp(var, "core.filemode")) {
 578                 trust_executable_bit = git_config_bool(var, value);
 579                 return 0;
 580         }
 581         if (!strcmp(var, "core.trustctime")) {
 582                 trust_ctime = git_config_bool(var, value);
 583                 return 0;
 584         }
 585         if (!strcmp(var, "core.statinfo")) {
 586                 if (!strcasecmp(value, "default"))
 587                         check_stat = 1;
 588                 else if (!strcasecmp(value, "minimal"))
 589                         check_stat = 0;
 590         }
 591
 592         if (!strcmp(var, "core.quotepath")) {
 593                 quote_path_fully = git_config_bool(var, value);
 594                 return 0;
 595         }
 596
 597         if (!strcmp(var, "core.symlinks")) {
 598                 has_symlinks = git_config_bool(var, value);
 599                 return 0;
 600         }
 601
 602         if (!strcmp(var, "core.ignorecase")) {
 603                 ignore_case = git_config_bool(var, value);
 604                 return 0;
 605         }
 606
 607         if (!strcmp(var, "core.attributesfile"))
 608                 return git_config_pathname(&git_attributes_file, var, value);
 609
 610         if (!strcmp(var, "core.bare")) {
 611                 is_bare_repository_cfg = git_config_bool(var, value);
 612                 return 0;
 613         }
 614
 615         if (!strcmp(var, "core.ignorestat")) {
 616                 assume_unchanged = git_config_bool(var, value);
 617                 return 0;
 618         }
 619
 620         if (!strcmp(var, "core.prefersymlinkrefs")) {
 621                 prefer_symlink_refs = git_config_bool(var, value);
 622                 return 0;
 623         }
 624
 625         if (!strcmp(var, "core.logallrefupdates")) {
 626                 log_all_ref_updates = git_config_bool(var, value);
 627                 return 0;
 628         }
 629
 630         if (!strcmp(var, "core.warnambiguousrefs")) {
 631                 warn_ambiguous_refs = git_config_bool(var, value);
 632                 return 0;
 633         }
 634
 635         if (!strcmp(var, "core.abbrev")) {
 636                 int abbrev = git_config_int(var, value);
 637                 if (abbrev < minimum_abbrev || abbrev > 40)
 638                         return -1;
 639                 default_abbrev = abbrev;
 640                 return 0;
 641         }
 642
 643         if (!strcmp(var, "core.loosecompression")) {
 644                 int level = git_config_int(var, value);
 645                 if (level == -1)
 646                         level = Z_DEFAULT_COMPRESSION;
 647                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 648                         die("bad zlib compression level %d", level);
 649                 zlib_compression_level = level;
 650                 zlib_compression_seen = 1;
 651                 return 0;
 652         }
 653
 654         if (!strcmp(var, "core.compression")) {
 655                 int level = git_config_int(var, value);
 656                 if (level == -1)
 657                         level = Z_DEFAULT_COMPRESSION;
 658                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 659                         die("bad zlib compression level %d", level);
 660                 core_compression_level = level;
 661                 core_compression_seen = 1;
 662                 if (!zlib_compression_seen)
 663                         zlib_compression_level = level;
 664                 return 0;
 665         }
 666
 667         if (!strcmp(var, "core.packedgitwindowsize")) {
 668                 int pgsz_x2 = getpagesize() * 2;
 669                 packed_git_window_size = git_config_ulong(var, value);
 670
 671                 /* This value must be multiple of (pagesize * 2) */
 672                 packed_git_window_size /= pgsz_x2;
 673                 if (packed_git_window_size < 1)
 674                         packed_git_window_size = 1;
 675                 packed_git_window_size *= pgsz_x2;
 676                 return 0;
 677         }
 678
 679         if (!strcmp(var, "core.bigfilethreshold")) {
 680                 big_file_threshold = git_config_ulong(var, value);
 681                 return 0;
 682         }
 683
 684         if (!strcmp(var, "core.packedgitlimit")) {
 685                 packed_git_limit = git_config_ulong(var, value);
 686                 return 0;
 687         }
 688
 689         if (!strcmp(var, "core.deltabasecachelimit")) {
 690                 delta_base_cache_limit = git_config_ulong(var, value);
 691                 return 0;
 692         }
 693
 694         if (!strcmp(var, "core.logpackaccess"))
 695                 return git_config_string(&log_pack_access, var, value);
 696
 697         if (!strcmp(var, "core.autocrlf")) {
 698                 if (value && !strcasecmp(value, "input")) {
 699                         if (core_eol == EOL_CRLF)
 700                                 return error("core.autocrlf=input conflicts with core.eol=crlf");
 701                         auto_crlf = AUTO_CRLF_INPUT;
 702                         return 0;
 703                 }
 704                 auto_crlf = git_config_bool(var, value);
 705                 return 0;
 706         }
 707
 708         if (!strcmp(var, "core.safecrlf")) {
 709                 if (value && !strcasecmp(value, "warn")) {
 710                         safe_crlf = SAFE_CRLF_WARN;
 711                         return 0;
 712                 }
 713                 safe_crlf = git_config_bool(var, value);
 714                 return 0;
 715         }
 716
 717         if (!strcmp(var, "core.eol")) {
 718                 if (value && !strcasecmp(value, "lf"))
 719                         core_eol = EOL_LF;
 720                 else if (value && !strcasecmp(value, "crlf"))
 721                         core_eol = EOL_CRLF;
 722                 else if (value && !strcasecmp(value, "native"))
 723                         core_eol = EOL_NATIVE;
 724                 else
 725                         core_eol = EOL_UNSET;
 726                 if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 727                         return error("core.autocrlf=input conflicts with core.eol=crlf");
 728                 return 0;
 729         }
 730
 731         if (!strcmp(var, "core.notesref")) {
 732                 notes_ref_name = xstrdup(value);
 733                 return 0;
 734         }
 735
 736         if (!strcmp(var, "core.pager"))
 737                 return git_config_string(&pager_program, var, value);
 738
 739         if (!strcmp(var, "core.editor"))
 740                 return git_config_string(&editor_program, var, value);
 741
 742         if (!strcmp(var, "core.commentchar")) {
 743                 const char *comment;
 744                 int ret = git_config_string(&comment, var, value);
 745                 if (!ret)
 746                         comment_line_char = comment[0];
 747                 return ret;
 748         }
 749
 750         if (!strcmp(var, "core.askpass"))
 751                 return git_config_string(&askpass_program, var, value);
 752
 753         if (!strcmp(var, "core.excludesfile"))
 754                 return git_config_pathname(&excludes_file, var, value);
 755
 756         if (!strcmp(var, "core.whitespace")) {
 757                 if (!value)
 758                         return config_error_nonbool(var);
 759                 whitespace_rule_cfg = parse_whitespace_rule(value);
 760                 return 0;
 761         }
 762
 763         if (!strcmp(var, "core.fsyncobjectfiles")) {
 764                 fsync_object_files = git_config_bool(var, value);
 765                 return 0;
 766         }
 767
 768         if (!strcmp(var, "core.preloadindex")) {
 769                 core_preload_index = git_config_bool(var, value);
 770                 return 0;
 771         }
 772
 773         if (!strcmp(var, "core.createobject")) {
 774                 if (!strcmp(value, "rename"))
 775                         object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 776                 else if (!strcmp(value, "link"))
 777                         object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 778                 else
 779                         die("Invalid mode for object creation: %s", value);
 780                 return 0;
 781         }
 782
 783         if (!strcmp(var, "core.sparsecheckout")) {
 784                 core_apply_sparse_checkout = git_config_bool(var, value);
 785                 return 0;
 786         }
 787
 788         if (!strcmp(var, "core.precomposeunicode")) {
 789                 precomposed_unicode = git_config_bool(var, value);
 790                 return 0;
 791         }
 792
 793         /* Add other config variables here and to Documentation/config.txt. */
 794         return 0;
 795 }
 796
 797 static int git_default_i18n_config(const char *var, const char *value)
 798 {
 799         if (!strcmp(var, "i18n.commitencoding"))
 800                 return git_config_string(&git_commit_encoding, var, value);
 801
 802         if (!strcmp(var, "i18n.logoutputencoding"))
 803                 return git_config_string(&git_log_output_encoding, var, value);
 804
 805         /* Add other config variables here and to Documentation/config.txt. */
 806         return 0;
 807 }
 808
 809 static int git_default_branch_config(const char *var, const char *value)
 810 {
 811         if (!strcmp(var, "branch.autosetupmerge")) {
 812                 if (value && !strcasecmp(value, "always")) {
 813                         git_branch_track = BRANCH_TRACK_ALWAYS;
 814                         return 0;
 815                 }
 816                 git_branch_track = git_config_bool(var, value);
 817                 return 0;
 818         }
 819         if (!strcmp(var, "branch.autosetuprebase")) {
 820                 if (!value)
 821                         return config_error_nonbool(var);
 822                 else if (!strcmp(value, "never"))
 823                         autorebase = AUTOREBASE_NEVER;
 824                 else if (!strcmp(value, "local"))
 825                         autorebase = AUTOREBASE_LOCAL;
 826                 else if (!strcmp(value, "remote"))
 827                         autorebase = AUTOREBASE_REMOTE;
 828                 else if (!strcmp(value, "always"))
 829                         autorebase = AUTOREBASE_ALWAYS;
 830                 else
 831                         return error("Malformed value for %s", var);
 832                 return 0;
 833         }
 834
 835         /* Add other config variables here and to Documentation/config.txt. */
 836         return 0;
 837 }
 838
 839 static int git_default_push_config(const char *var, const char *value)
 840 {
 841         if (!strcmp(var, "push.default")) {
 842                 if (!value)
 843                         return config_error_nonbool(var);
 844                 else if (!strcmp(value, "nothing"))
 845                         push_default = PUSH_DEFAULT_NOTHING;
 846                 else if (!strcmp(value, "matching"))
 847                         push_default = PUSH_DEFAULT_MATCHING;
 848                 else if (!strcmp(value, "simple"))
 849                         push_default = PUSH_DEFAULT_SIMPLE;
 850                 else if (!strcmp(value, "upstream"))
 851                         push_default = PUSH_DEFAULT_UPSTREAM;
 852                 else if (!strcmp(value, "tracking")) /* deprecated */
 853                         push_default = PUSH_DEFAULT_UPSTREAM;
 854                 else if (!strcmp(value, "current"))
 855                         push_default = PUSH_DEFAULT_CURRENT;
 856                 else {
 857                         error("Malformed value for %s: %s", var, value);
 858                         return error("Must be one of nothing, matching, simple, "
 859                                      "upstream or current.");
 860                 }
 861                 return 0;
 862         }
 863
 864         /* Add other config variables here and to Documentation/config.txt. */
 865         return 0;
 866 }
 867
 868 static int git_default_mailmap_config(const char *var, const char *value)
 869 {
 870         if (!strcmp(var, "mailmap.file"))
 871                 return git_config_string(&git_mailmap_file, var, value);
 872         if (!strcmp(var, "mailmap.blob"))
 873                 return git_config_string(&git_mailmap_blob, var, value);
 874
 875         /* Add other config variables here and to Documentation/config.txt. */
 876         return 0;
 877 }
 878
 879 int git_default_config(const char *var, const char *value, void *dummy)
 880 {
 881         if (!prefixcmp(var, "core."))
 882                 return git_default_core_config(var, value);
 883
 884         if (!prefixcmp(var, "user."))
 885                 return git_ident_config(var, value, dummy);
 886
 887         if (!prefixcmp(var, "i18n."))
 888                 return git_default_i18n_config(var, value);
 889
 890         if (!prefixcmp(var, "branch."))
 891                 return git_default_branch_config(var, value);
 892
 893         if (!prefixcmp(var, "push."))
 894                 return git_default_push_config(var, value);
 895
 896         if (!prefixcmp(var, "mailmap."))
 897                 return git_default_mailmap_config(var, value);
 898
 899         if (!prefixcmp(var, "advice."))
 900                 return git_default_advice_config(var, value);
 901
 902         if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 903                 pager_use_color = git_config_bool(var,value);
 904                 return 0;
 905         }
 906
 907         if (!strcmp(var, "pack.packsizelimit")) {
 908                 pack_size_limit_cfg = git_config_ulong(var, value);
 909                 return 0;
 910         }
 911         /* Add other config variables here and to Documentation/config.txt. */
 912         return 0;
 913 }
 914
 915 /*
 916  * All source specific fields in the union, name and the callbacks
 917  * fgetc, ungetc, ftell of top need to be initialized before calling
 918  * this function.
 919  */
 920 static int do_config_from(struct config_source *top, config_fn_t fn, void *data)
 921 {
 922         int ret;
 923
 924         /* push config-file parsing state stack */
 925         top->prev = cf;
 926         top->linenr = 1;
 927         top->eof = 0;
 928         strbuf_init(&top->value, 1024);
 929         strbuf_init(&top->var, 1024);
 930         cf = top;
 931
 932         ret = git_parse_source(fn, data);
 933
 934         /* pop config-file parsing state stack */
 935         strbuf_release(&top->value);
 936         strbuf_release(&top->var);
 937         cf = top->prev;
 938
 939         return ret;
 940 }
 941
 942 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 943 {
 944         int ret;
 945         FILE *f = fopen(filename, "r");
 946
 947         ret = -1;
 948         if (f) {
 949                 struct config_source top;
 950
 951                 top.u.file = f;
 952                 top.name = filename;
 953                 top.fgetc = config_file_fgetc;
 954                 top.ungetc = config_file_ungetc;
 955                 top.ftell = config_file_ftell;
 956
 957                 ret = do_config_from(&top, fn, data);
 958
 959                 fclose(f);
 960         }
 961         return ret;
 962 }
 963
 964 const char *git_etc_gitconfig(void)
 965 {
 966         static const char *system_wide;
 967         if (!system_wide)
 968                 system_wide = system_path(ETC_GITCONFIG);
 969         return system_wide;
 970 }
 971
 972 int git_env_bool(const char *k, int def)
 973 {
 974         const char *v = getenv(k);
 975         return v ? git_config_bool(k, v) : def;
 976 }
 977
 978 int git_config_system(void)
 979 {
 980         return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 981 }
 982
 983 int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 984 {
 985         int ret = 0, found = 0;
 986         char *xdg_config = NULL;
 987         char *user_config = NULL;
 988
 989         home_config_paths(&user_config, &xdg_config, "config");
 990
 991         if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK)) {
 992                 ret += git_config_from_file(fn, git_etc_gitconfig(),
 993                                             data);
 994                 found += 1;
 995         }
 996
 997         if (xdg_config && !access_or_die(xdg_config, R_OK)) {
 998                 ret += git_config_from_file(fn, xdg_config, data);
 999                 found += 1;
1000         }
1001
1002         if (user_config && !access_or_die(user_config, R_OK)) {
1003                 ret += git_config_from_file(fn, user_config, data);
1004                 found += 1;
1005         }
1006
1007         if (repo_config && !access_or_die(repo_config, R_OK)) {
1008                 ret += git_config_from_file(fn, repo_config, data);
1009                 found += 1;
1010         }
1011
1012         switch (git_config_from_parameters(fn, data)) {
1013         case -1: /* error */
1014                 die("unable to parse command-line config");
1015                 break;
1016         case 0: /* found nothing */
1017                 break;
1018         default: /* found at least one item */
1019                 found++;
1020                 break;
1021         }
1022
1023         free(xdg_config);
1024         free(user_config);
1025         return ret == 0 ? found : ret;
1026 }
1027
1028 int git_config_with_options(config_fn_t fn, void *data,
1029                             const char *filename, int respect_includes)
1030 {
1031         char *repo_config = NULL;
1032         int ret;
1033         struct config_include_data inc = CONFIG_INCLUDE_INIT;
1034
1035         if (respect_includes) {
1036                 inc.fn = fn;
1037                 inc.data = data;
1038                 fn = git_config_include;
1039                 data = &inc;
1040         }
1041
1042         /*
1043          * If we have a specific filename, use it. Otherwise, follow the
1044          * regular lookup sequence.
1045          */
1046         if (filename)
1047                 return git_config_from_file(fn, filename, data);
1048
1049         repo_config = git_pathdup("config");
1050         ret = git_config_early(fn, data, repo_config);
1051         if (repo_config)
1052                 free(repo_config);
1053         return ret;
1054 }
1055
1056 int git_config(config_fn_t fn, void *data)
1057 {
1058         return git_config_with_options(fn, data, NULL, 1);
1059 }
1060
1061 /*
1062  * Find all the stuff for git_config_set() below.
1063  */
1064
1065 #define MAX_MATCHES 512
1066
1067 static struct {
1068         int baselen;
1069         char *key;
1070         int do_not_match;
1071         regex_t *value_regex;
1072         int multi_replace;
1073         size_t offset[MAX_MATCHES];
1074         enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1075         int seen;
1076 } store;
1077
1078 static int matches(const char *key, const char *value)
1079 {
1080         return !strcmp(key, store.key) &&
1081                 (store.value_regex == NULL ||
1082                  (store.do_not_match ^
1083                   !regexec(store.value_regex, value, 0, NULL, 0)));
1084 }
1085
1086 static int store_aux(const char *key, const char *value, void *cb)
1087 {
1088         const char *ep;
1089         size_t section_len;
1090
1091         switch (store.state) {
1092         case KEY_SEEN:
1093                 if (matches(key, value)) {
1094                         if (store.seen == 1 && store.multi_replace == 0) {
1095                                 warning("%s has multiple values", key);
1096                         } else if (store.seen >= MAX_MATCHES) {
1097                                 error("too many matches for %s", key);
1098                                 return 1;
1099                         }
1100
1101                         store.offset[store.seen] = cf->ftell(cf);
1102                         store.seen++;
1103                 }
1104                 break;
1105         case SECTION_SEEN:
1106                 /*
1107                  * What we are looking for is in store.key (both
1108                  * section and var), and its section part is baselen
1109                  * long.  We found key (again, both section and var).
1110                  * We would want to know if this key is in the same
1111                  * section as what we are looking for.  We already
1112                  * know we are in the same section as what should
1113                  * hold store.key.
1114                  */
1115                 ep = strrchr(key, '.');
1116                 section_len = ep - key;
1117
1118                 if ((section_len != store.baselen) ||
1119                     memcmp(key, store.key, section_len+1)) {
1120                         store.state = SECTION_END_SEEN;
1121                         break;
1122                 }
1123
1124                 /*
1125                  * Do not increment matches: this is no match, but we
1126                  * just made sure we are in the desired section.
1127                  */
1128                 store.offset[store.seen] = cf->ftell(cf);
1129                 /* fallthru */
1130         case SECTION_END_SEEN:
1131         case START:
1132                 if (matches(key, value)) {
1133                         store.offset[store.seen] = cf->ftell(cf);
1134                         store.state = KEY_SEEN;
1135                         store.seen++;
1136                 } else {
1137                         if (strrchr(key, '.') - key == store.baselen &&
1138                               !strncmp(key, store.key, store.baselen)) {
1139                                         store.state = SECTION_SEEN;
1140                                         store.offset[store.seen] = cf->ftell(cf);
1141                         }
1142                 }
1143         }
1144         return 0;
1145 }
1146
1147 static int write_error(const char *filename)
1148 {
1149         error("failed to write new configuration file %s", filename);
1150
1151         /* Same error code as "failed to rename". */
1152         return 4;
1153 }
1154
1155 static int store_write_section(int fd, const char *key)
1156 {
1157         const char *dot;
1158         int i, success;
1159         struct strbuf sb = STRBUF_INIT;
1160
1161         dot = memchr(key, '.', store.baselen);
1162         if (dot) {
1163                 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1164                 for (i = dot - key + 1; i < store.baselen; i++) {
1165                         if (key[i] == '"' || key[i] == '\\')
1166                                 strbuf_addch(&sb, '\\');
1167                         strbuf_addch(&sb, key[i]);
1168                 }
1169                 strbuf_addstr(&sb, "\"]\n");
1170         } else {
1171                 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1172         }
1173
1174         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1175         strbuf_release(&sb);
1176
1177         return success;
1178 }
1179
1180 static int store_write_pair(int fd, const char *key, const char *value)
1181 {
1182         int i, success;
1183         int length = strlen(key + store.baselen + 1);
1184         const char *quote = "";
1185         struct strbuf sb = STRBUF_INIT;
1186
1187         /*
1188          * Check to see if the value needs to be surrounded with a dq pair.
1189          * Note that problematic characters are always backslash-quoted; this
1190          * check is about not losing leading or trailing SP and strings that
1191          * follow beginning-of-comment characters (i.e. ';' and '#') by the
1192          * configuration parser.
1193          */
1194         if (value[0] == ' ')
1195                 quote = "\"";
1196         for (i = 0; value[i]; i++)
1197                 if (value[i] == ';' || value[i] == '#')
1198                         quote = "\"";
1199         if (i && value[i - 1] == ' ')
1200                 quote = "\"";
1201
1202         strbuf_addf(&sb, "\t%.*s = %s",
1203                     length, key + store.baselen + 1, quote);
1204
1205         for (i = 0; value[i]; i++)
1206                 switch (value[i]) {
1207                 case '\n':
1208                         strbuf_addstr(&sb, "\\n");
1209                         break;
1210                 case '\t':
1211                         strbuf_addstr(&sb, "\\t");
1212                         break;
1213                 case '"':
1214                 case '\\':
1215                         strbuf_addch(&sb, '\\');
1216                 default:
1217                         strbuf_addch(&sb, value[i]);
1218                         break;
1219                 }
1220         strbuf_addf(&sb, "%s\n", quote);
1221
1222         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1223         strbuf_release(&sb);
1224
1225         return success;
1226 }
1227
1228 static ssize_t find_beginning_of_line(const char *contents, size_t size,
1229         size_t offset_, int *found_bracket)
1230 {
1231         size_t equal_offset = size, bracket_offset = size;
1232         ssize_t offset;
1233
1234 contline:
1235         for (offset = offset_-2; offset > 0
1236                         && contents[offset] != '\n'; offset--)
1237                 switch (contents[offset]) {
1238                         case '=': equal_offset = offset; break;
1239                         case ']': bracket_offset = offset; break;
1240                 }
1241         if (offset > 0 && contents[offset-1] == '\\') {
1242                 offset_ = offset;
1243                 goto contline;
1244         }
1245         if (bracket_offset < equal_offset) {
1246                 *found_bracket = 1;
1247                 offset = bracket_offset+1;
1248         } else
1249                 offset++;
1250
1251         return offset;
1252 }
1253
1254 int git_config_set_in_file(const char *config_filename,
1255                         const char *key, const char *value)
1256 {
1257         return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1258 }
1259
1260 int git_config_set(const char *key, const char *value)
1261 {
1262         return git_config_set_multivar(key, value, NULL, 0);
1263 }
1264
1265 /*
1266  * Auxiliary function to sanity-check and split the key into the section
1267  * identifier and variable name.
1268  *
1269  * Returns 0 on success, -1 when there is an invalid character in the key and
1270  * -2 if there is no section name in the key.
1271  *
1272  * store_key - pointer to char* which will hold a copy of the key with
1273  *             lowercase section and variable name
1274  * baselen - pointer to int which will hold the length of the
1275  *           section + subsection part, can be NULL
1276  */
1277 int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1278 {
1279         int i, dot, baselen;
1280         const char *last_dot = strrchr(key, '.');
1281
1282         /*
1283          * Since "key" actually contains the section name and the real
1284          * key name separated by a dot, we have to know where the dot is.
1285          */
1286
1287         if (last_dot == NULL || last_dot == key) {
1288                 error("key does not contain a section: %s", key);
1289                 return -CONFIG_NO_SECTION_OR_NAME;
1290         }
1291
1292         if (!last_dot[1]) {
1293                 error("key does not contain variable name: %s", key);
1294                 return -CONFIG_NO_SECTION_OR_NAME;
1295         }
1296
1297         baselen = last_dot - key;
1298         if (baselen_)
1299                 *baselen_ = baselen;
1300
1301         /*
1302          * Validate the key and while at it, lower case it for matching.
1303          */
1304         *store_key = xmalloc(strlen(key) + 1);
1305
1306         dot = 0;
1307         for (i = 0; key[i]; i++) {
1308                 unsigned char c = key[i];
1309                 if (c == '.')
1310                         dot = 1;
1311                 /* Leave the extended basename untouched.. */
1312                 if (!dot || i > baselen) {
1313                         if (!iskeychar(c) ||
1314                             (i == baselen + 1 && !isalpha(c))) {
1315                                 error("invalid key: %s", key);
1316                                 goto out_free_ret_1;
1317                         }
1318                         c = tolower(c);
1319                 } else if (c == '\n') {
1320                         error("invalid key (newline): %s", key);
1321                         goto out_free_ret_1;
1322                 }
1323                 (*store_key)[i] = c;
1324         }
1325         (*store_key)[i] = 0;
1326
1327         return 0;
1328
1329 out_free_ret_1:
1330         free(*store_key);
1331         *store_key = NULL;
1332         return -CONFIG_INVALID_KEY;
1333 }
1334
1335 /*
1336  * If value==NULL, unset in (remove from) config,
1337  * if value_regex!=NULL, disregard key/value pairs where value does not match.
1338  * if multi_replace==0, nothing, or only one matching key/value is replaced,
1339  *     else all matching key/values (regardless how many) are removed,
1340  *     before the new pair is written.
1341  *
1342  * Returns 0 on success.
1343  *
1344  * This function does this:
1345  *
1346  * - it locks the config file by creating ".git/config.lock"
1347  *
1348  * - it then parses the config using store_aux() as validator to find
1349  *   the position on the key/value pair to replace. If it is to be unset,
1350  *   it must be found exactly once.
1351  *
1352  * - the config file is mmap()ed and the part before the match (if any) is
1353  *   written to the lock file, then the changed part and the rest.
1354  *
1355  * - the config file is removed and the lock file rename()d to it.
1356  *
1357  */
1358 int git_config_set_multivar_in_file(const char *config_filename,
1359                                 const char *key, const char *value,
1360                                 const char *value_regex, int multi_replace)
1361 {
1362         int fd = -1, in_fd;
1363         int ret;
1364         struct lock_file *lock = NULL;
1365         char *filename_buf = NULL;
1366
1367         /* parse-key returns negative; flip the sign to feed exit(3) */
1368         ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1369         if (ret)
1370                 goto out_free;
1371
1372         store.multi_replace = multi_replace;
1373
1374         if (!config_filename)
1375                 config_filename = filename_buf = git_pathdup("config");
1376
1377         /*
1378          * The lock serves a purpose in addition to locking: the new
1379          * contents of .git/config will be written into it.
1380          */
1381         lock = xcalloc(sizeof(struct lock_file), 1);
1382         fd = hold_lock_file_for_update(lock, config_filename, 0);
1383         if (fd < 0) {
1384                 error("could not lock config file %s: %s", config_filename, strerror(errno));
1385                 free(store.key);
1386                 ret = CONFIG_NO_LOCK;
1387                 goto out_free;
1388         }
1389
1390         /*
1391          * If .git/config does not exist yet, write a minimal version.
1392          */
1393         in_fd = open(config_filename, O_RDONLY);
1394         if ( in_fd < 0 ) {
1395                 free(store.key);
1396
1397                 if ( ENOENT != errno ) {
1398                         error("opening %s: %s", config_filename,
1399                               strerror(errno));
1400                         ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1401                         goto out_free;
1402                 }
1403                 /* if nothing to unset, error out */
1404                 if (value == NULL) {
1405                         ret = CONFIG_NOTHING_SET;
1406                         goto out_free;
1407                 }
1408
1409                 store.key = (char *)key;
1410                 if (!store_write_section(fd, key) ||
1411                     !store_write_pair(fd, key, value))
1412                         goto write_err_out;
1413         } else {
1414                 struct stat st;
1415                 char *contents;
1416                 size_t contents_sz, copy_begin, copy_end;
1417                 int i, new_line = 0;
1418
1419                 if (value_regex == NULL)
1420                         store.value_regex = NULL;
1421                 else {
1422                         if (value_regex[0] == '!') {
1423                                 store.do_not_match = 1;
1424                                 value_regex++;
1425                         } else
1426                                 store.do_not_match = 0;
1427
1428                         store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1429                         if (regcomp(store.value_regex, value_regex,
1430                                         REG_EXTENDED)) {
1431                                 error("invalid pattern: %s", value_regex);
1432                                 free(store.value_regex);
1433                                 ret = CONFIG_INVALID_PATTERN;
1434                                 goto out_free;
1435                         }
1436                 }
1437
1438                 store.offset[0] = 0;
1439                 store.state = START;
1440                 store.seen = 0;
1441
1442                 /*
1443                  * After this, store.offset will contain the *end* offset
1444                  * of the last match, or remain at 0 if no match was found.
1445                  * As a side effect, we make sure to transform only a valid
1446                  * existing config file.
1447                  */
1448                 if (git_config_from_file(store_aux, config_filename, NULL)) {
1449                         error("invalid config file %s", config_filename);
1450                         free(store.key);
1451                         if (store.value_regex != NULL) {
1452                                 regfree(store.value_regex);
1453                                 free(store.value_regex);
1454                         }
1455                         ret = CONFIG_INVALID_FILE;
1456                         goto out_free;
1457                 }
1458
1459                 free(store.key);
1460                 if (store.value_regex != NULL) {
1461                         regfree(store.value_regex);
1462                         free(store.value_regex);
1463                 }
1464
1465                 /* if nothing to unset, or too many matches, error out */
1466                 if ((store.seen == 0 && value == NULL) ||
1467                                 (store.seen > 1 && multi_replace == 0)) {
1468                         ret = CONFIG_NOTHING_SET;
1469                         goto out_free;
1470                 }
1471
1472                 fstat(in_fd, &st);
1473                 contents_sz = xsize_t(st.st_size);
1474                 contents = xmmap(NULL, contents_sz, PROT_READ,
1475                         MAP_PRIVATE, in_fd, 0);
1476                 close(in_fd);
1477
1478                 if (store.seen == 0)
1479                         store.seen = 1;
1480
1481                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1482                         if (store.offset[i] == 0) {
1483                                 store.offset[i] = copy_end = contents_sz;
1484                         } else if (store.state != KEY_SEEN) {
1485                                 copy_end = store.offset[i];
1486                         } else
1487                                 copy_end = find_beginning_of_line(
1488                                         contents, contents_sz,
1489                                         store.offset[i]-2, &new_line);
1490
1491                         if (copy_end > 0 && contents[copy_end-1] != '\n')
1492                                 new_line = 1;
1493
1494                         /* write the first part of the config */
1495                         if (copy_end > copy_begin) {
1496                                 if (write_in_full(fd, contents + copy_begin,
1497                                                   copy_end - copy_begin) <
1498                                     copy_end - copy_begin)
1499                                         goto write_err_out;
1500                                 if (new_line &&
1501                                     write_str_in_full(fd, "\n") != 1)
1502                                         goto write_err_out;
1503                         }
1504                         copy_begin = store.offset[i];
1505                 }
1506
1507                 /* write the pair (value == NULL means unset) */
1508                 if (value != NULL) {
1509                         if (store.state == START) {
1510                                 if (!store_write_section(fd, key))
1511                                         goto write_err_out;
1512                         }
1513                         if (!store_write_pair(fd, key, value))
1514                                 goto write_err_out;
1515                 }
1516
1517                 /* write the rest of the config */
1518                 if (copy_begin < contents_sz)
1519                         if (write_in_full(fd, contents + copy_begin,
1520                                           contents_sz - copy_begin) <
1521                             contents_sz - copy_begin)
1522                                 goto write_err_out;
1523
1524                 munmap(contents, contents_sz);
1525         }
1526
1527         if (commit_lock_file(lock) < 0) {
1528                 error("could not commit config file %s", config_filename);
1529                 ret = CONFIG_NO_WRITE;
1530                 goto out_free;
1531         }
1532
1533         /*
1534          * lock is committed, so don't try to roll it back below.
1535          * NOTE: Since lockfile.c keeps a linked list of all created
1536          * lock_file structures, it isn't safe to free(lock).  It's
1537          * better to just leave it hanging around.
1538          */
1539         lock = NULL;
1540         ret = 0;
1541
1542 out_free:
1543         if (lock)
1544                 rollback_lock_file(lock);
1545         free(filename_buf);
1546         return ret;
1547
1548 write_err_out:
1549         ret = write_error(lock->filename);
1550         goto out_free;
1551
1552 }
1553
1554 int git_config_set_multivar(const char *key, const char *value,
1555                         const char *value_regex, int multi_replace)
1556 {
1557         return git_config_set_multivar_in_file(NULL, key, value, value_regex,
1558                                                multi_replace);
1559 }
1560
1561 static int section_name_match (const char *buf, const char *name)
1562 {
1563         int i = 0, j = 0, dot = 0;
1564         if (buf[i] != '[')
1565                 return 0;
1566         for (i = 1; buf[i] && buf[i] != ']'; i++) {
1567                 if (!dot && isspace(buf[i])) {
1568                         dot = 1;
1569                         if (name[j++] != '.')
1570                                 break;
1571                         for (i++; isspace(buf[i]); i++)
1572                                 ; /* do nothing */
1573                         if (buf[i] != '"')
1574                                 break;
1575                         continue;
1576                 }
1577                 if (buf[i] == '\\' && dot)
1578                         i++;
1579                 else if (buf[i] == '"' && dot) {
1580                         for (i++; isspace(buf[i]); i++)
1581                                 ; /* do_nothing */
1582                         break;
1583                 }
1584                 if (buf[i] != name[j++])
1585                         break;
1586         }
1587         if (buf[i] == ']' && name[j] == 0) {
1588                 /*
1589                  * We match, now just find the right length offset by
1590                  * gobbling up any whitespace after it, as well
1591                  */
1592                 i++;
1593                 for (; buf[i] && isspace(buf[i]); i++)
1594                         ; /* do nothing */
1595                 return i;
1596         }
1597         return 0;
1598 }
1599
1600 static int section_name_is_ok(const char *name)
1601 {
1602         /* Empty section names are bogus. */
1603         if (!*name)
1604                 return 0;
1605
1606         /*
1607          * Before a dot, we must be alphanumeric or dash. After the first dot,
1608          * anything goes, so we can stop checking.
1609          */
1610         for (; *name && *name != '.'; name++)
1611                 if (*name != '-' && !isalnum(*name))
1612                         return 0;
1613         return 1;
1614 }
1615
1616 /* if new_name == NULL, the section is removed instead */
1617 int git_config_rename_section_in_file(const char *config_filename,
1618                                       const char *old_name, const char *new_name)
1619 {
1620         int ret = 0, remove = 0;
1621         char *filename_buf = NULL;
1622         struct lock_file *lock;
1623         int out_fd;
1624         char buf[1024];
1625         FILE *config_file;
1626
1627         if (new_name && !section_name_is_ok(new_name)) {
1628                 ret = error("invalid section name: %s", new_name);
1629                 goto out;
1630         }
1631
1632         if (!config_filename)
1633                 config_filename = filename_buf = git_pathdup("config");
1634
1635         lock = xcalloc(sizeof(struct lock_file), 1);
1636         out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1637         if (out_fd < 0) {
1638                 ret = error("could not lock config file %s", config_filename);
1639                 goto out;
1640         }
1641
1642         if (!(config_file = fopen(config_filename, "rb"))) {
1643                 /* no config file means nothing to rename, no error */
1644                 goto unlock_and_out;
1645         }
1646
1647         while (fgets(buf, sizeof(buf), config_file)) {
1648                 int i;
1649                 int length;
1650                 char *output = buf;
1651                 for (i = 0; buf[i] && isspace(buf[i]); i++)
1652                         ; /* do nothing */
1653                 if (buf[i] == '[') {
1654                         /* it's a section */
1655                         int offset = section_name_match(&buf[i], old_name);
1656                         if (offset > 0) {
1657                                 ret++;
1658                                 if (new_name == NULL) {
1659                                         remove = 1;
1660                                         continue;
1661                                 }
1662                                 store.baselen = strlen(new_name);
1663                                 if (!store_write_section(out_fd, new_name)) {
1664                                         ret = write_error(lock->filename);
1665                                         goto out;
1666                                 }
1667                                 /*
1668                                  * We wrote out the new section, with
1669                                  * a newline, now skip the old
1670                                  * section's length
1671                                  */
1672                                 output += offset + i;
1673                                 if (strlen(output) > 0) {
1674                                         /*
1675                                          * More content means there's
1676                                          * a declaration to put on the
1677                                          * next line; indent with a
1678                                          * tab
1679                                          */
1680                                         output -= 1;
1681                                         output[0] = '\t';
1682                                 }
1683                         }
1684                         remove = 0;
1685                 }
1686                 if (remove)
1687                         continue;
1688                 length = strlen(output);
1689                 if (write_in_full(out_fd, output, length) != length) {
1690                         ret = write_error(lock->filename);
1691                         goto out;
1692                 }
1693         }
1694         fclose(config_file);
1695 unlock_and_out:
1696         if (commit_lock_file(lock) < 0)
1697                 ret = error("could not commit config file %s", config_filename);
1698 out:
1699         free(filename_buf);
1700         return ret;
1701 }
1702
1703 int git_config_rename_section(const char *old_name, const char *new_name)
1704 {
1705         return git_config_rename_section_in_file(NULL, old_name, new_name);
1706 }
1707
1708 /*
1709  * Call this to report error for your variable that should not
1710  * get a boolean value (i.e. "[my] var" means "true").
1711  */
1712 #undef config_error_nonbool
1713 int config_error_nonbool(const char *var)
1714 {
1715         return error("Missing value for '%s'", var);
1716 }
1717
1718 int parse_config_key(const char *var,
1719                      const char *section,
1720                      const char **subsection, int *subsection_len,
1721                      const char **key)
1722 {
1723         int section_len = strlen(section);
1724         const char *dot;
1725
1726         /* Does it start with "section." ? */
1727         if (prefixcmp(var, section) || var[section_len] != '.')
1728                 return -1;
1729
1730         /*
1731          * Find the key; we don't know yet if we have a subsection, but we must
1732          * parse backwards from the end, since the subsection may have dots in
1733          * it, too.
1734          */
1735         dot = strrchr(var, '.');
1736         *key = dot + 1;
1737
1738         /* Did we have a subsection at all? */
1739         if (dot == var + section_len) {
1740                 *subsection = NULL;
1741                 *subsection_len = 0;
1742         }
1743         else {
1744                 *subsection = var + section_len + 1;
1745                 *subsection_len = dot - *subsection;
1746         }
1747
1748         return 0;
1749 }