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 typedef struct config_file {
  14         struct config_file *prev;
  15         FILE *f;
  16         const char *name;
  17         int linenr;
  18         int eof;
  19         struct strbuf value;
  20         struct strbuf var;
  21 } config_file;
  22
  23 static config_file *cf;
  24
  25 static int zlib_compression_seen;
  26
  27 #define MAX_INCLUDE_DEPTH 10
  28 static const char include_depth_advice[] =
  29 "exceeded maximum include depth (%d) while including\n"
  30 "       %s\n"
  31 "from\n"
  32 "       %s\n"
  33 "Do you have circular includes?";
  34 static int handle_path_include(const char *path, struct config_include_data *inc)
  35 {
  36         int ret = 0;
  37         struct strbuf buf = STRBUF_INIT;
  38         char *expanded = expand_user_path(path);
  39
  40         if (!expanded)
  41                 return error("Could not expand include path '%s'", path);
  42         path = expanded;
  43
  44         /*
  45          * Use an absolute path as-is, but interpret relative paths
  46          * based on the including config file.
  47          */
  48         if (!is_absolute_path(path)) {
  49                 char *slash;
  50
  51                 if (!cf || !cf->name)
  52                         return error("relative config includes must come from files");
  53
  54                 slash = find_last_dir_sep(cf->name);
  55                 if (slash)
  56                         strbuf_add(&buf, cf->name, slash - cf->name + 1);
  57                 strbuf_addstr(&buf, path);
  58                 path = buf.buf;
  59         }
  60
  61         if (!access_or_die(path, R_OK, 0)) {
  62                 if (++inc->depth > MAX_INCLUDE_DEPTH)
  63                         die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
  64                             cf && cf->name ? cf->name : "the command line");
  65                 ret = git_config_from_file(git_config_include, path, inc);
  66                 inc->depth--;
  67         }
  68         strbuf_release(&buf);
  69         free(expanded);
  70         return ret;
  71 }
  72
  73 int git_config_include(const char *var, const char *value, void *data)
  74 {
  75         struct config_include_data *inc = data;
  76         const char *type;
  77         int ret;
  78
  79         /*
  80          * Pass along all values, including "include" directives; this makes it
  81          * possible to query information on the includes themselves.
  82          */
  83         ret = inc->fn(var, value, inc->data);
  84         if (ret < 0)
  85                 return ret;
  86
  87         type = skip_prefix(var, "include.");
  88         if (!type)
  89                 return ret;
  90
  91         if (!strcmp(type, "path"))
  92                 ret = handle_path_include(value, inc);
  93         return ret;
  94 }
  95
  96 static void lowercase(char *p)
  97 {
  98         for (; *p; p++)
  99                 *p = tolower(*p);
 100 }
 101
 102 void git_config_push_parameter(const char *text)
 103 {
 104         struct strbuf env = STRBUF_INIT;
 105         const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
 106         if (old) {
 107                 strbuf_addstr(&env, old);
 108                 strbuf_addch(&env, ' ');
 109         }
 110         sq_quote_buf(&env, text);
 111         setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
 112         strbuf_release(&env);
 113 }
 114
 115 int git_config_parse_parameter(const char *text,
 116                                config_fn_t fn, void *data)
 117 {
 118         struct strbuf **pair;
 119         pair = strbuf_split_str(text, '=', 2);
 120         if (!pair[0])
 121                 return error("bogus config parameter: %s", text);
 122         if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
 123                 strbuf_setlen(pair[0], pair[0]->len - 1);
 124         strbuf_trim(pair[0]);
 125         if (!pair[0]->len) {
 126                 strbuf_list_free(pair);
 127                 return error("bogus config parameter: %s", text);
 128         }
 129         lowercase(pair[0]->buf);
 130         if (fn(pair[0]->buf, pair[1] ? pair[1]->buf : NULL, data) < 0) {
 131                 strbuf_list_free(pair);
 132                 return -1;
 133         }
 134         strbuf_list_free(pair);
 135         return 0;
 136 }
 137
 138 int git_config_from_parameters(config_fn_t fn, void *data)
 139 {
 140         const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 141         char *envw;
 142         const char **argv = NULL;
 143         int nr = 0, alloc = 0;
 144         int i;
 145
 146         if (!env)
 147                 return 0;
 148         /* sq_dequote will write over it */
 149         envw = xstrdup(env);
 150
 151         if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 152                 free(envw);
 153                 return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
 154         }
 155
 156         for (i = 0; i < nr; i++) {
 157                 if (git_config_parse_parameter(argv[i], fn, data) < 0) {
 158                         free(argv);
 159                         free(envw);
 160                         return -1;
 161                 }
 162         }
 163
 164         free(argv);
 165         free(envw);
 166         return nr > 0;
 167 }
 168
 169 static int get_next_char(void)
 170 {
 171         int c;
 172         FILE *f;
 173
 174         c = '\n';
 175         if (cf && ((f = cf->f) != NULL)) {
 176                 c = fgetc(f);
 177                 if (c == '\r') {
 178                         /* DOS like systems */
 179                         c = fgetc(f);
 180                         if (c != '\n') {
 181                                 ungetc(c, f);
 182                                 c = '\r';
 183                         }
 184                 }
 185                 if (c == '\n')
 186                         cf->linenr++;
 187                 if (c == EOF) {
 188                         cf->eof = 1;
 189                         c = '\n';
 190                 }
 191         }
 192         return c;
 193 }
 194
 195 static char *parse_value(void)
 196 {
 197         int quote = 0, comment = 0, space = 0;
 198
 199         strbuf_reset(&cf->value);
 200         for (;;) {
 201                 int c = get_next_char();
 202                 if (c == '\n') {
 203                         if (quote) {
 204                                 cf->linenr--;
 205                                 return NULL;
 206                         }
 207                         return cf->value.buf;
 208                 }
 209                 if (comment)
 210                         continue;
 211                 if (isspace(c) && !quote) {
 212                         if (cf->value.len)
 213                                 space++;
 214                         continue;
 215                 }
 216                 if (!quote) {
 217                         if (c == ';' || c == '#') {
 218                                 comment = 1;
 219                                 continue;
 220                         }
 221                 }
 222                 for (; space; space--)
 223                         strbuf_addch(&cf->value, ' ');
 224                 if (c == '\\') {
 225                         c = get_next_char();
 226                         switch (c) {
 227                         case '\n':
 228                                 continue;
 229                         case 't':
 230                                 c = '\t';
 231                                 break;
 232                         case 'b':
 233                                 c = '\b';
 234                                 break;
 235                         case 'n':
 236                                 c = '\n';
 237                                 break;
 238                         /* Some characters escape as themselves */
 239                         case '\\': case '"':
 240                                 break;
 241                         /* Reject unknown escape sequences */
 242                         default:
 243                                 return NULL;
 244                         }
 245                         strbuf_addch(&cf->value, c);
 246                         continue;
 247                 }
 248                 if (c == '"') {
 249                         quote = 1-quote;
 250                         continue;
 251                 }
 252                 strbuf_addch(&cf->value, c);
 253         }
 254 }
 255
 256 static inline int iskeychar(int c)
 257 {
 258         return isalnum(c) || c == '-';
 259 }
 260
 261 static int get_value(config_fn_t fn, void *data, struct strbuf *name)
 262 {
 263         int c;
 264         char *value;
 265
 266         /* Get the full name */
 267         for (;;) {
 268                 c = get_next_char();
 269                 if (cf->eof)
 270                         break;
 271                 if (!iskeychar(c))
 272                         break;
 273                 strbuf_addch(name, tolower(c));
 274         }
 275
 276         while (c == ' ' || c == '\t')
 277                 c = get_next_char();
 278
 279         value = NULL;
 280         if (c != '\n') {
 281                 if (c != '=')
 282                         return -1;
 283                 value = parse_value();
 284                 if (!value)
 285                         return -1;
 286         }
 287         return fn(name->buf, value, data);
 288 }
 289
 290 static int get_extended_base_var(struct strbuf *name, int c)
 291 {
 292         do {
 293                 if (c == '\n')
 294                         goto error_incomplete_line;
 295                 c = get_next_char();
 296         } while (isspace(c));
 297
 298         /* We require the format to be '[base "extension"]' */
 299         if (c != '"')
 300                 return -1;
 301         strbuf_addch(name, '.');
 302
 303         for (;;) {
 304                 int c = get_next_char();
 305                 if (c == '\n')
 306                         goto error_incomplete_line;
 307                 if (c == '"')
 308                         break;
 309                 if (c == '\\') {
 310                         c = get_next_char();
 311                         if (c == '\n')
 312                                 goto error_incomplete_line;
 313                 }
 314                 strbuf_addch(name, c);
 315         }
 316
 317         /* Final ']' */
 318         if (get_next_char() != ']')
 319                 return -1;
 320         return 0;
 321 error_incomplete_line:
 322         cf->linenr--;
 323         return -1;
 324 }
 325
 326 static int get_base_var(struct strbuf *name)
 327 {
 328         for (;;) {
 329                 int c = get_next_char();
 330                 if (cf->eof)
 331                         return -1;
 332                 if (c == ']')
 333                         return 0;
 334                 if (isspace(c))
 335                         return get_extended_base_var(name, c);
 336                 if (!iskeychar(c) && c != '.')
 337                         return -1;
 338                 strbuf_addch(name, tolower(c));
 339         }
 340 }
 341
 342 static int git_parse_file(config_fn_t fn, void *data)
 343 {
 344         int comment = 0;
 345         int baselen = 0;
 346         struct strbuf *var = &cf->var;
 347
 348         /* U+FEFF Byte Order Mark in UTF8 */
 349         static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 350         const unsigned char *bomptr = utf8_bom;
 351
 352         for (;;) {
 353                 int c = get_next_char();
 354                 if (bomptr && *bomptr) {
 355                         /* We are at the file beginning; skip UTF8-encoded BOM
 356                          * if present. Sane editors won't put this in on their
 357                          * own, but e.g. Windows Notepad will do it happily. */
 358                         if ((unsigned char) c == *bomptr) {
 359                                 bomptr++;
 360                                 continue;
 361                         } else {
 362                                 /* Do not tolerate partial BOM. */
 363                                 if (bomptr != utf8_bom)
 364                                         break;
 365                                 /* No BOM at file beginning. Cool. */
 366                                 bomptr = NULL;
 367                         }
 368                 }
 369                 if (c == '\n') {
 370                         if (cf->eof)
 371                                 return 0;
 372                         comment = 0;
 373                         continue;
 374                 }
 375                 if (comment || isspace(c))
 376                         continue;
 377                 if (c == '#' || c == ';') {
 378                         comment = 1;
 379                         continue;
 380                 }
 381                 if (c == '[') {
 382                         /* Reset prior to determining a new stem */
 383                         strbuf_reset(var);
 384                         if (get_base_var(var) < 0 || var->len < 1)
 385                                 break;
 386                         strbuf_addch(var, '.');
 387                         baselen = var->len;
 388                         continue;
 389                 }
 390                 if (!isalpha(c))
 391                         break;
 392                 /*
 393                  * Truncate the var name back to the section header
 394                  * stem prior to grabbing the suffix part of the name
 395                  * and the value.
 396                  */
 397                 strbuf_setlen(var, baselen);
 398                 strbuf_addch(var, tolower(c));
 399                 if (get_value(fn, data, var) < 0)
 400                         break;
 401         }
 402         die("bad config file line %d in %s", cf->linenr, cf->name);
 403 }
 404
 405 static int parse_unit_factor(const char *end, uintmax_t *val)
 406 {
 407         if (!*end)
 408                 return 1;
 409         else if (!strcasecmp(end, "k")) {
 410                 *val *= 1024;
 411                 return 1;
 412         }
 413         else if (!strcasecmp(end, "m")) {
 414                 *val *= 1024 * 1024;
 415                 return 1;
 416         }
 417         else if (!strcasecmp(end, "g")) {
 418                 *val *= 1024 * 1024 * 1024;
 419                 return 1;
 420         }
 421         return 0;
 422 }
 423
 424 static int git_parse_long(const char *value, long *ret)
 425 {
 426         if (value && *value) {
 427                 char *end;
 428                 intmax_t val;
 429                 uintmax_t uval;
 430                 uintmax_t factor = 1;
 431
 432                 errno = 0;
 433                 val = strtoimax(value, &end, 0);
 434                 if (errno == ERANGE)
 435                         return 0;
 436                 if (!parse_unit_factor(end, &factor))
 437                         return 0;
 438                 uval = abs(val);
 439                 uval *= factor;
 440                 if ((uval > maximum_signed_value_of_type(long)) ||
 441                     (abs(val) > uval))
 442                         return 0;
 443                 val *= factor;
 444                 *ret = val;
 445                 return 1;
 446         }
 447         return 0;
 448 }
 449
 450 int git_parse_ulong(const char *value, unsigned long *ret)
 451 {
 452         if (value && *value) {
 453                 char *end;
 454                 uintmax_t val;
 455                 uintmax_t oldval;
 456
 457                 errno = 0;
 458                 val = strtoumax(value, &end, 0);
 459                 if (errno == ERANGE)
 460                         return 0;
 461                 oldval = val;
 462                 if (!parse_unit_factor(end, &val))
 463                         return 0;
 464                 if ((val > maximum_unsigned_value_of_type(long)) ||
 465                     (oldval > val))
 466                         return 0;
 467                 *ret = val;
 468                 return 1;
 469         }
 470         return 0;
 471 }
 472
 473 static void die_bad_config(const char *name)
 474 {
 475         if (cf && cf->name)
 476                 die("bad config value for '%s' in %s", name, cf->name);
 477         die("bad config value for '%s'", name);
 478 }
 479
 480 int git_config_int(const char *name, const char *value)
 481 {
 482         long ret = 0;
 483         if (!git_parse_long(value, &ret))
 484                 die_bad_config(name);
 485         return ret;
 486 }
 487
 488 unsigned long git_config_ulong(const char *name, const char *value)
 489 {
 490         unsigned long ret;
 491         if (!git_parse_ulong(value, &ret))
 492                 die_bad_config(name);
 493         return ret;
 494 }
 495
 496 static int git_config_maybe_bool_text(const char *name, const char *value)
 497 {
 498         if (!value)
 499                 return 1;
 500         if (!*value)
 501                 return 0;
 502         if (!strcasecmp(value, "true")
 503             || !strcasecmp(value, "yes")
 504             || !strcasecmp(value, "on"))
 505                 return 1;
 506         if (!strcasecmp(value, "false")
 507             || !strcasecmp(value, "no")
 508             || !strcasecmp(value, "off"))
 509                 return 0;
 510         return -1;
 511 }
 512
 513 int git_config_maybe_bool(const char *name, const char *value)
 514 {
 515         long v = git_config_maybe_bool_text(name, value);
 516         if (0 <= v)
 517                 return v;
 518         if (git_parse_long(value, &v))
 519                 return !!v;
 520         return -1;
 521 }
 522
 523 int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 524 {
 525         int v = git_config_maybe_bool_text(name, value);
 526         if (0 <= v) {
 527                 *is_bool = 1;
 528                 return v;
 529         }
 530         *is_bool = 0;
 531         return git_config_int(name, value);
 532 }
 533
 534 int git_config_bool(const char *name, const char *value)
 535 {
 536         int discard;
 537         return !!git_config_bool_or_int(name, value, &discard);
 538 }
 539
 540 int git_config_string(const char **dest, const char *var, const char *value)
 541 {
 542         if (!value)
 543                 return config_error_nonbool(var);
 544         *dest = xstrdup(value);
 545         return 0;
 546 }
 547
 548 int git_config_pathname(const char **dest, const char *var, const char *value)
 549 {
 550         if (!value)
 551                 return config_error_nonbool(var);
 552         *dest = expand_user_path(value);
 553         if (!*dest)
 554                 die("Failed to expand user dir in: '%s'", value);
 555         return 0;
 556 }
 557
 558 static int git_default_core_config(const char *var, const char *value)
 559 {
 560         /* This needs a better name */
 561         if (!strcmp(var, "core.filemode")) {
 562                 trust_executable_bit = git_config_bool(var, value);
 563                 return 0;
 564         }
 565         if (!strcmp(var, "core.trustctime")) {
 566                 trust_ctime = git_config_bool(var, value);
 567                 return 0;
 568         }
 569         if (!strcmp(var, "core.statinfo") ||
 570             !strcmp(var, "core.checkstat")) {
 571                 /*
 572                  * NEEDSWORK: statinfo was a typo in v1.8.2 that has
 573                  * never been advertised.  we will remove it at Git
 574                  * 2.0 boundary.
 575                  */
 576                 if (!strcmp(var, "core.statinfo")) {
 577                         static int warned;
 578                         if (!warned++) {
 579                                 warning("'core.statinfo' will be removed in Git 2.0; "
 580                                         "use 'core.checkstat' instead.");
 581                         }
 582                 }
 583                 if (!strcasecmp(value, "default"))
 584                         check_stat = 1;
 585                 else if (!strcasecmp(value, "minimal"))
 586                         check_stat = 0;
 587         }
 588
 589         if (!strcmp(var, "core.quotepath")) {
 590                 quote_path_fully = git_config_bool(var, value);
 591                 return 0;
 592         }
 593
 594         if (!strcmp(var, "core.symlinks")) {
 595                 has_symlinks = git_config_bool(var, value);
 596                 return 0;
 597         }
 598
 599         if (!strcmp(var, "core.ignorecase")) {
 600                 ignore_case = git_config_bool(var, value);
 601                 return 0;
 602         }
 603
 604         if (!strcmp(var, "core.attributesfile"))
 605                 return git_config_pathname(&git_attributes_file, var, value);
 606
 607         if (!strcmp(var, "core.bare")) {
 608                 is_bare_repository_cfg = git_config_bool(var, value);
 609                 return 0;
 610         }
 611
 612         if (!strcmp(var, "core.ignorestat")) {
 613                 assume_unchanged = git_config_bool(var, value);
 614                 return 0;
 615         }
 616
 617         if (!strcmp(var, "core.prefersymlinkrefs")) {
 618                 prefer_symlink_refs = git_config_bool(var, value);
 619                 return 0;
 620         }
 621
 622         if (!strcmp(var, "core.logallrefupdates")) {
 623                 log_all_ref_updates = git_config_bool(var, value);
 624                 return 0;
 625         }
 626
 627         if (!strcmp(var, "core.warnambiguousrefs")) {
 628                 warn_ambiguous_refs = git_config_bool(var, value);
 629                 return 0;
 630         }
 631
 632         if (!strcmp(var, "core.abbrev")) {
 633                 int abbrev = git_config_int(var, value);
 634                 if (abbrev < minimum_abbrev || abbrev > 40)
 635                         return -1;
 636                 default_abbrev = abbrev;
 637                 return 0;
 638         }
 639
 640         if (!strcmp(var, "core.loosecompression")) {
 641                 int level = git_config_int(var, value);
 642                 if (level == -1)
 643                         level = Z_DEFAULT_COMPRESSION;
 644                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 645                         die("bad zlib compression level %d", level);
 646                 zlib_compression_level = level;
 647                 zlib_compression_seen = 1;
 648                 return 0;
 649         }
 650
 651         if (!strcmp(var, "core.compression")) {
 652                 int level = git_config_int(var, value);
 653                 if (level == -1)
 654                         level = Z_DEFAULT_COMPRESSION;
 655                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 656                         die("bad zlib compression level %d", level);
 657                 core_compression_level = level;
 658                 core_compression_seen = 1;
 659                 if (!zlib_compression_seen)
 660                         zlib_compression_level = level;
 661                 return 0;
 662         }
 663
 664         if (!strcmp(var, "core.packedgitwindowsize")) {
 665                 int pgsz_x2 = getpagesize() * 2;
 666                 packed_git_window_size = git_config_ulong(var, value);
 667
 668                 /* This value must be multiple of (pagesize * 2) */
 669                 packed_git_window_size /= pgsz_x2;
 670                 if (packed_git_window_size < 1)
 671                         packed_git_window_size = 1;
 672                 packed_git_window_size *= pgsz_x2;
 673                 return 0;
 674         }
 675
 676         if (!strcmp(var, "core.bigfilethreshold")) {
 677                 big_file_threshold = git_config_ulong(var, value);
 678                 return 0;
 679         }
 680
 681         if (!strcmp(var, "core.packedgitlimit")) {
 682                 packed_git_limit = git_config_ulong(var, value);
 683                 return 0;
 684         }
 685
 686         if (!strcmp(var, "core.deltabasecachelimit")) {
 687                 delta_base_cache_limit = git_config_ulong(var, value);
 688                 return 0;
 689         }
 690
 691         if (!strcmp(var, "core.logpackaccess"))
 692                 return git_config_string(&log_pack_access, var, value);
 693
 694         if (!strcmp(var, "core.autocrlf")) {
 695                 if (value && !strcasecmp(value, "input")) {
 696                         if (core_eol == EOL_CRLF)
 697                                 return error("core.autocrlf=input conflicts with core.eol=crlf");
 698                         auto_crlf = AUTO_CRLF_INPUT;
 699                         return 0;
 700                 }
 701                 auto_crlf = git_config_bool(var, value);
 702                 return 0;
 703         }
 704
 705         if (!strcmp(var, "core.safecrlf")) {
 706                 if (value && !strcasecmp(value, "warn")) {
 707                         safe_crlf = SAFE_CRLF_WARN;
 708                         return 0;
 709                 }
 710                 safe_crlf = git_config_bool(var, value);
 711                 return 0;
 712         }
 713
 714         if (!strcmp(var, "core.eol")) {
 715                 if (value && !strcasecmp(value, "lf"))
 716                         core_eol = EOL_LF;
 717                 else if (value && !strcasecmp(value, "crlf"))
 718                         core_eol = EOL_CRLF;
 719                 else if (value && !strcasecmp(value, "native"))
 720                         core_eol = EOL_NATIVE;
 721                 else
 722                         core_eol = EOL_UNSET;
 723                 if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 724                         return error("core.autocrlf=input conflicts with core.eol=crlf");
 725                 return 0;
 726         }
 727
 728         if (!strcmp(var, "core.notesref")) {
 729                 notes_ref_name = xstrdup(value);
 730                 return 0;
 731         }
 732
 733         if (!strcmp(var, "core.pager"))
 734                 return git_config_string(&pager_program, var, value);
 735
 736         if (!strcmp(var, "core.editor"))
 737                 return git_config_string(&editor_program, var, value);
 738
 739         if (!strcmp(var, "core.commentchar")) {
 740                 const char *comment;
 741                 int ret = git_config_string(&comment, var, value);
 742                 if (!ret)
 743                         comment_line_char = comment[0];
 744                 return ret;
 745         }
 746
 747         if (!strcmp(var, "core.askpass"))
 748                 return git_config_string(&askpass_program, var, value);
 749
 750         if (!strcmp(var, "core.excludesfile"))
 751                 return git_config_pathname(&excludes_file, var, value);
 752
 753         if (!strcmp(var, "core.whitespace")) {
 754                 if (!value)
 755                         return config_error_nonbool(var);
 756                 whitespace_rule_cfg = parse_whitespace_rule(value);
 757                 return 0;
 758         }
 759
 760         if (!strcmp(var, "core.fsyncobjectfiles")) {
 761                 fsync_object_files = git_config_bool(var, value);
 762                 return 0;
 763         }
 764
 765         if (!strcmp(var, "core.preloadindex")) {
 766                 core_preload_index = git_config_bool(var, value);
 767                 return 0;
 768         }
 769
 770         if (!strcmp(var, "core.createobject")) {
 771                 if (!strcmp(value, "rename"))
 772                         object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 773                 else if (!strcmp(value, "link"))
 774                         object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 775                 else
 776                         die("Invalid mode for object creation: %s", value);
 777                 return 0;
 778         }
 779
 780         if (!strcmp(var, "core.sparsecheckout")) {
 781                 core_apply_sparse_checkout = git_config_bool(var, value);
 782                 return 0;
 783         }
 784
 785         if (!strcmp(var, "core.precomposeunicode")) {
 786                 precomposed_unicode = git_config_bool(var, value);
 787                 return 0;
 788         }
 789
 790         /* Add other config variables here and to Documentation/config.txt. */
 791         return 0;
 792 }
 793
 794 static int git_default_i18n_config(const char *var, const char *value)
 795 {
 796         if (!strcmp(var, "i18n.commitencoding"))
 797                 return git_config_string(&git_commit_encoding, var, value);
 798
 799         if (!strcmp(var, "i18n.logoutputencoding"))
 800                 return git_config_string(&git_log_output_encoding, var, value);
 801
 802         /* Add other config variables here and to Documentation/config.txt. */
 803         return 0;
 804 }
 805
 806 static int git_default_branch_config(const char *var, const char *value)
 807 {
 808         if (!strcmp(var, "branch.autosetupmerge")) {
 809                 if (value && !strcasecmp(value, "always")) {
 810                         git_branch_track = BRANCH_TRACK_ALWAYS;
 811                         return 0;
 812                 }
 813                 git_branch_track = git_config_bool(var, value);
 814                 return 0;
 815         }
 816         if (!strcmp(var, "branch.autosetuprebase")) {
 817                 if (!value)
 818                         return config_error_nonbool(var);
 819                 else if (!strcmp(value, "never"))
 820                         autorebase = AUTOREBASE_NEVER;
 821                 else if (!strcmp(value, "local"))
 822                         autorebase = AUTOREBASE_LOCAL;
 823                 else if (!strcmp(value, "remote"))
 824                         autorebase = AUTOREBASE_REMOTE;
 825                 else if (!strcmp(value, "always"))
 826                         autorebase = AUTOREBASE_ALWAYS;
 827                 else
 828                         return error("Malformed value for %s", var);
 829                 return 0;
 830         }
 831
 832         /* Add other config variables here and to Documentation/config.txt. */
 833         return 0;
 834 }
 835
 836 static int git_default_push_config(const char *var, const char *value)
 837 {
 838         if (!strcmp(var, "push.default")) {
 839                 if (!value)
 840                         return config_error_nonbool(var);
 841                 else if (!strcmp(value, "nothing"))
 842                         push_default = PUSH_DEFAULT_NOTHING;
 843                 else if (!strcmp(value, "matching"))
 844                         push_default = PUSH_DEFAULT_MATCHING;
 845                 else if (!strcmp(value, "simple"))
 846                         push_default = PUSH_DEFAULT_SIMPLE;
 847                 else if (!strcmp(value, "upstream"))
 848                         push_default = PUSH_DEFAULT_UPSTREAM;
 849                 else if (!strcmp(value, "tracking")) /* deprecated */
 850                         push_default = PUSH_DEFAULT_UPSTREAM;
 851                 else if (!strcmp(value, "current"))
 852                         push_default = PUSH_DEFAULT_CURRENT;
 853                 else {
 854                         error("Malformed value for %s: %s", var, value);
 855                         return error("Must be one of nothing, matching, simple, "
 856                                      "upstream or current.");
 857                 }
 858                 return 0;
 859         }
 860
 861         /* Add other config variables here and to Documentation/config.txt. */
 862         return 0;
 863 }
 864
 865 static int git_default_mailmap_config(const char *var, const char *value)
 866 {
 867         if (!strcmp(var, "mailmap.file"))
 868                 return git_config_string(&git_mailmap_file, var, value);
 869         if (!strcmp(var, "mailmap.blob"))
 870                 return git_config_string(&git_mailmap_blob, var, value);
 871
 872         /* Add other config variables here and to Documentation/config.txt. */
 873         return 0;
 874 }
 875
 876 int git_default_config(const char *var, const char *value, void *dummy)
 877 {
 878         if (!prefixcmp(var, "core."))
 879                 return git_default_core_config(var, value);
 880
 881         if (!prefixcmp(var, "user."))
 882                 return git_ident_config(var, value, dummy);
 883
 884         if (!prefixcmp(var, "i18n."))
 885                 return git_default_i18n_config(var, value);
 886
 887         if (!prefixcmp(var, "branch."))
 888                 return git_default_branch_config(var, value);
 889
 890         if (!prefixcmp(var, "push."))
 891                 return git_default_push_config(var, value);
 892
 893         if (!prefixcmp(var, "mailmap."))
 894                 return git_default_mailmap_config(var, value);
 895
 896         if (!prefixcmp(var, "advice."))
 897                 return git_default_advice_config(var, value);
 898
 899         if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 900                 pager_use_color = git_config_bool(var,value);
 901                 return 0;
 902         }
 903
 904         if (!strcmp(var, "pack.packsizelimit")) {
 905                 pack_size_limit_cfg = git_config_ulong(var, value);
 906                 return 0;
 907         }
 908         /* Add other config variables here and to Documentation/config.txt. */
 909         return 0;
 910 }
 911
 912 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 913 {
 914         int ret;
 915         FILE *f = fopen(filename, "r");
 916
 917         ret = -1;
 918         if (f) {
 919                 config_file top;
 920
 921                 /* push config-file parsing state stack */
 922                 top.prev = cf;
 923                 top.f = f;
 924                 top.name = filename;
 925                 top.linenr = 1;
 926                 top.eof = 0;
 927                 strbuf_init(&top.value, 1024);
 928                 strbuf_init(&top.var, 1024);
 929                 cf = &top;
 930
 931                 ret = git_parse_file(fn, data);
 932
 933                 /* pop config-file parsing state stack */
 934                 strbuf_release(&top.value);
 935                 strbuf_release(&top.var);
 936                 cf = top.prev;
 937
 938                 fclose(f);
 939         }
 940         return ret;
 941 }
 942
 943 const char *git_etc_gitconfig(void)
 944 {
 945         static const char *system_wide;
 946         if (!system_wide)
 947                 system_wide = system_path(ETC_GITCONFIG);
 948         return system_wide;
 949 }
 950
 951 int git_env_bool(const char *k, int def)
 952 {
 953         const char *v = getenv(k);
 954         return v ? git_config_bool(k, v) : def;
 955 }
 956
 957 int git_config_system(void)
 958 {
 959         return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 960 }
 961
 962 int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 963 {
 964         int ret = 0, found = 0;
 965         char *xdg_config = NULL;
 966         char *user_config = NULL;
 967
 968         home_config_paths(&user_config, &xdg_config, "config");
 969
 970         if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0)) {
 971                 ret += git_config_from_file(fn, git_etc_gitconfig(),
 972                                             data);
 973                 found += 1;
 974         }
 975
 976         if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK)) {
 977                 ret += git_config_from_file(fn, xdg_config, data);
 978                 found += 1;
 979         }
 980
 981         if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK)) {
 982                 ret += git_config_from_file(fn, user_config, data);
 983                 found += 1;
 984         }
 985
 986         if (repo_config && !access_or_die(repo_config, R_OK, 0)) {
 987                 ret += git_config_from_file(fn, repo_config, data);
 988                 found += 1;
 989         }
 990
 991         switch (git_config_from_parameters(fn, data)) {
 992         case -1: /* error */
 993                 die("unable to parse command-line config");
 994                 break;
 995         case 0: /* found nothing */
 996                 break;
 997         default: /* found at least one item */
 998                 found++;
 999                 break;
1000         }
1001
1002         free(xdg_config);
1003         free(user_config);
1004         return ret == 0 ? found : ret;
1005 }
1006
1007 int git_config_with_options(config_fn_t fn, void *data,
1008                             const char *filename, int respect_includes)
1009 {
1010         char *repo_config = NULL;
1011         int ret;
1012         struct config_include_data inc = CONFIG_INCLUDE_INIT;
1013
1014         if (respect_includes) {
1015                 inc.fn = fn;
1016                 inc.data = data;
1017                 fn = git_config_include;
1018                 data = &inc;
1019         }
1020
1021         /*
1022          * If we have a specific filename, use it. Otherwise, follow the
1023          * regular lookup sequence.
1024          */
1025         if (filename)
1026                 return git_config_from_file(fn, filename, data);
1027
1028         repo_config = git_pathdup("config");
1029         ret = git_config_early(fn, data, repo_config);
1030         if (repo_config)
1031                 free(repo_config);
1032         return ret;
1033 }
1034
1035 int git_config(config_fn_t fn, void *data)
1036 {
1037         return git_config_with_options(fn, data, NULL, 1);
1038 }
1039
1040 /*
1041  * Find all the stuff for git_config_set() below.
1042  */
1043
1044 #define MAX_MATCHES 512
1045
1046 static struct {
1047         int baselen;
1048         char *key;
1049         int do_not_match;
1050         regex_t *value_regex;
1051         int multi_replace;
1052         size_t offset[MAX_MATCHES];
1053         enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1054         int seen;
1055 } store;
1056
1057 static int matches(const char *key, const char *value)
1058 {
1059         return !strcmp(key, store.key) &&
1060                 (store.value_regex == NULL ||
1061                  (store.do_not_match ^
1062                   !regexec(store.value_regex, value, 0, NULL, 0)));
1063 }
1064
1065 static int store_aux(const char *key, const char *value, void *cb)
1066 {
1067         const char *ep;
1068         size_t section_len;
1069         FILE *f = cf->f;
1070
1071         switch (store.state) {
1072         case KEY_SEEN:
1073                 if (matches(key, value)) {
1074                         if (store.seen == 1 && store.multi_replace == 0) {
1075                                 warning("%s has multiple values", key);
1076                         } else if (store.seen >= MAX_MATCHES) {
1077                                 error("too many matches for %s", key);
1078                                 return 1;
1079                         }
1080
1081                         store.offset[store.seen] = ftell(f);
1082                         store.seen++;
1083                 }
1084                 break;
1085         case SECTION_SEEN:
1086                 /*
1087                  * What we are looking for is in store.key (both
1088                  * section and var), and its section part is baselen
1089                  * long.  We found key (again, both section and var).
1090                  * We would want to know if this key is in the same
1091                  * section as what we are looking for.  We already
1092                  * know we are in the same section as what should
1093                  * hold store.key.
1094                  */
1095                 ep = strrchr(key, '.');
1096                 section_len = ep - key;
1097
1098                 if ((section_len != store.baselen) ||
1099                     memcmp(key, store.key, section_len+1)) {
1100                         store.state = SECTION_END_SEEN;
1101                         break;
1102                 }
1103
1104                 /*
1105                  * Do not increment matches: this is no match, but we
1106                  * just made sure we are in the desired section.
1107                  */
1108                 store.offset[store.seen] = ftell(f);
1109                 /* fallthru */
1110         case SECTION_END_SEEN:
1111         case START:
1112                 if (matches(key, value)) {
1113                         store.offset[store.seen] = ftell(f);
1114                         store.state = KEY_SEEN;
1115                         store.seen++;
1116                 } else {
1117                         if (strrchr(key, '.') - key == store.baselen &&
1118                               !strncmp(key, store.key, store.baselen)) {
1119                                         store.state = SECTION_SEEN;
1120                                         store.offset[store.seen] = ftell(f);
1121                         }
1122                 }
1123         }
1124         return 0;
1125 }
1126
1127 static int write_error(const char *filename)
1128 {
1129         error("failed to write new configuration file %s", filename);
1130
1131         /* Same error code as "failed to rename". */
1132         return 4;
1133 }
1134
1135 static int store_write_section(int fd, const char *key)
1136 {
1137         const char *dot;
1138         int i, success;
1139         struct strbuf sb = STRBUF_INIT;
1140
1141         dot = memchr(key, '.', store.baselen);
1142         if (dot) {
1143                 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1144                 for (i = dot - key + 1; i < store.baselen; i++) {
1145                         if (key[i] == '"' || key[i] == '\\')
1146                                 strbuf_addch(&sb, '\\');
1147                         strbuf_addch(&sb, key[i]);
1148                 }
1149                 strbuf_addstr(&sb, "\"]\n");
1150         } else {
1151                 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1152         }
1153
1154         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1155         strbuf_release(&sb);
1156
1157         return success;
1158 }
1159
1160 static int store_write_pair(int fd, const char *key, const char *value)
1161 {
1162         int i, success;
1163         int length = strlen(key + store.baselen + 1);
1164         const char *quote = "";
1165         struct strbuf sb = STRBUF_INIT;
1166
1167         /*
1168          * Check to see if the value needs to be surrounded with a dq pair.
1169          * Note that problematic characters are always backslash-quoted; this
1170          * check is about not losing leading or trailing SP and strings that
1171          * follow beginning-of-comment characters (i.e. ';' and '#') by the
1172          * configuration parser.
1173          */
1174         if (value[0] == ' ')
1175                 quote = "\"";
1176         for (i = 0; value[i]; i++)
1177                 if (value[i] == ';' || value[i] == '#')
1178                         quote = "\"";
1179         if (i && value[i - 1] == ' ')
1180                 quote = "\"";
1181
1182         strbuf_addf(&sb, "\t%.*s = %s",
1183                     length, key + store.baselen + 1, quote);
1184
1185         for (i = 0; value[i]; i++)
1186                 switch (value[i]) {
1187                 case '\n':
1188                         strbuf_addstr(&sb, "\\n");
1189                         break;
1190                 case '\t':
1191                         strbuf_addstr(&sb, "\\t");
1192                         break;
1193                 case '"':
1194                 case '\\':
1195                         strbuf_addch(&sb, '\\');
1196                 default:
1197                         strbuf_addch(&sb, value[i]);
1198                         break;
1199                 }
1200         strbuf_addf(&sb, "%s\n", quote);
1201
1202         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1203         strbuf_release(&sb);
1204
1205         return success;
1206 }
1207
1208 static ssize_t find_beginning_of_line(const char *contents, size_t size,
1209         size_t offset_, int *found_bracket)
1210 {
1211         size_t equal_offset = size, bracket_offset = size;
1212         ssize_t offset;
1213
1214 contline:
1215         for (offset = offset_-2; offset > 0
1216                         && contents[offset] != '\n'; offset--)
1217                 switch (contents[offset]) {
1218                         case '=': equal_offset = offset; break;
1219                         case ']': bracket_offset = offset; break;
1220                 }
1221         if (offset > 0 && contents[offset-1] == '\\') {
1222                 offset_ = offset;
1223                 goto contline;
1224         }
1225         if (bracket_offset < equal_offset) {
1226                 *found_bracket = 1;
1227                 offset = bracket_offset+1;
1228         } else
1229                 offset++;
1230
1231         return offset;
1232 }
1233
1234 int git_config_set_in_file(const char *config_filename,
1235                         const char *key, const char *value)
1236 {
1237         return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1238 }
1239
1240 int git_config_set(const char *key, const char *value)
1241 {
1242         return git_config_set_multivar(key, value, NULL, 0);
1243 }
1244
1245 /*
1246  * Auxiliary function to sanity-check and split the key into the section
1247  * identifier and variable name.
1248  *
1249  * Returns 0 on success, -1 when there is an invalid character in the key and
1250  * -2 if there is no section name in the key.
1251  *
1252  * store_key - pointer to char* which will hold a copy of the key with
1253  *             lowercase section and variable name
1254  * baselen - pointer to int which will hold the length of the
1255  *           section + subsection part, can be NULL
1256  */
1257 int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1258 {
1259         int i, dot, baselen;
1260         const char *last_dot = strrchr(key, '.');
1261
1262         /*
1263          * Since "key" actually contains the section name and the real
1264          * key name separated by a dot, we have to know where the dot is.
1265          */
1266
1267         if (last_dot == NULL || last_dot == key) {
1268                 error("key does not contain a section: %s", key);
1269                 return -CONFIG_NO_SECTION_OR_NAME;
1270         }
1271
1272         if (!last_dot[1]) {
1273                 error("key does not contain variable name: %s", key);
1274                 return -CONFIG_NO_SECTION_OR_NAME;
1275         }
1276
1277         baselen = last_dot - key;
1278         if (baselen_)
1279                 *baselen_ = baselen;
1280
1281         /*
1282          * Validate the key and while at it, lower case it for matching.
1283          */
1284         *store_key = xmalloc(strlen(key) + 1);
1285
1286         dot = 0;
1287         for (i = 0; key[i]; i++) {
1288                 unsigned char c = key[i];
1289                 if (c == '.')
1290                         dot = 1;
1291                 /* Leave the extended basename untouched.. */
1292                 if (!dot || i > baselen) {
1293                         if (!iskeychar(c) ||
1294                             (i == baselen + 1 && !isalpha(c))) {
1295                                 error("invalid key: %s", key);
1296                                 goto out_free_ret_1;
1297                         }
1298                         c = tolower(c);
1299                 } else if (c == '\n') {
1300                         error("invalid key (newline): %s", key);
1301                         goto out_free_ret_1;
1302                 }
1303                 (*store_key)[i] = c;
1304         }
1305         (*store_key)[i] = 0;
1306
1307         return 0;
1308
1309 out_free_ret_1:
1310         free(*store_key);
1311         *store_key = NULL;
1312         return -CONFIG_INVALID_KEY;
1313 }
1314
1315 /*
1316  * If value==NULL, unset in (remove from) config,
1317  * if value_regex!=NULL, disregard key/value pairs where value does not match.
1318  * if multi_replace==0, nothing, or only one matching key/value is replaced,
1319  *     else all matching key/values (regardless how many) are removed,
1320  *     before the new pair is written.
1321  *
1322  * Returns 0 on success.
1323  *
1324  * This function does this:
1325  *
1326  * - it locks the config file by creating ".git/config.lock"
1327  *
1328  * - it then parses the config using store_aux() as validator to find
1329  *   the position on the key/value pair to replace. If it is to be unset,
1330  *   it must be found exactly once.
1331  *
1332  * - the config file is mmap()ed and the part before the match (if any) is
1333  *   written to the lock file, then the changed part and the rest.
1334  *
1335  * - the config file is removed and the lock file rename()d to it.
1336  *
1337  */
1338 int git_config_set_multivar_in_file(const char *config_filename,
1339                                 const char *key, const char *value,
1340                                 const char *value_regex, int multi_replace)
1341 {
1342         int fd = -1, in_fd;
1343         int ret;
1344         struct lock_file *lock = NULL;
1345         char *filename_buf = NULL;
1346
1347         /* parse-key returns negative; flip the sign to feed exit(3) */
1348         ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1349         if (ret)
1350                 goto out_free;
1351
1352         store.multi_replace = multi_replace;
1353
1354         if (!config_filename)
1355                 config_filename = filename_buf = git_pathdup("config");
1356
1357         /*
1358          * The lock serves a purpose in addition to locking: the new
1359          * contents of .git/config will be written into it.
1360          */
1361         lock = xcalloc(sizeof(struct lock_file), 1);
1362         fd = hold_lock_file_for_update(lock, config_filename, 0);
1363         if (fd < 0) {
1364                 error("could not lock config file %s: %s", config_filename, strerror(errno));
1365                 free(store.key);
1366                 ret = CONFIG_NO_LOCK;
1367                 goto out_free;
1368         }
1369
1370         /*
1371          * If .git/config does not exist yet, write a minimal version.
1372          */
1373         in_fd = open(config_filename, O_RDONLY);
1374         if ( in_fd < 0 ) {
1375                 free(store.key);
1376
1377                 if ( ENOENT != errno ) {
1378                         error("opening %s: %s", config_filename,
1379                               strerror(errno));
1380                         ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1381                         goto out_free;
1382                 }
1383                 /* if nothing to unset, error out */
1384                 if (value == NULL) {
1385                         ret = CONFIG_NOTHING_SET;
1386                         goto out_free;
1387                 }
1388
1389                 store.key = (char *)key;
1390                 if (!store_write_section(fd, key) ||
1391                     !store_write_pair(fd, key, value))
1392                         goto write_err_out;
1393         } else {
1394                 struct stat st;
1395                 char *contents;
1396                 size_t contents_sz, copy_begin, copy_end;
1397                 int i, new_line = 0;
1398
1399                 if (value_regex == NULL)
1400                         store.value_regex = NULL;
1401                 else {
1402                         if (value_regex[0] == '!') {
1403                                 store.do_not_match = 1;
1404                                 value_regex++;
1405                         } else
1406                                 store.do_not_match = 0;
1407
1408                         store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1409                         if (regcomp(store.value_regex, value_regex,
1410                                         REG_EXTENDED)) {
1411                                 error("invalid pattern: %s", value_regex);
1412                                 free(store.value_regex);
1413                                 ret = CONFIG_INVALID_PATTERN;
1414                                 goto out_free;
1415                         }
1416                 }
1417
1418                 store.offset[0] = 0;
1419                 store.state = START;
1420                 store.seen = 0;
1421
1422                 /*
1423                  * After this, store.offset will contain the *end* offset
1424                  * of the last match, or remain at 0 if no match was found.
1425                  * As a side effect, we make sure to transform only a valid
1426                  * existing config file.
1427                  */
1428                 if (git_config_from_file(store_aux, config_filename, NULL)) {
1429                         error("invalid config file %s", config_filename);
1430                         free(store.key);
1431                         if (store.value_regex != NULL) {
1432                                 regfree(store.value_regex);
1433                                 free(store.value_regex);
1434                         }
1435                         ret = CONFIG_INVALID_FILE;
1436                         goto out_free;
1437                 }
1438
1439                 free(store.key);
1440                 if (store.value_regex != NULL) {
1441                         regfree(store.value_regex);
1442                         free(store.value_regex);
1443                 }
1444
1445                 /* if nothing to unset, or too many matches, error out */
1446                 if ((store.seen == 0 && value == NULL) ||
1447                                 (store.seen > 1 && multi_replace == 0)) {
1448                         ret = CONFIG_NOTHING_SET;
1449                         goto out_free;
1450                 }
1451
1452                 fstat(in_fd, &st);
1453                 contents_sz = xsize_t(st.st_size);
1454                 contents = xmmap(NULL, contents_sz, PROT_READ,
1455                         MAP_PRIVATE, in_fd, 0);
1456                 close(in_fd);
1457
1458                 if (store.seen == 0)
1459                         store.seen = 1;
1460
1461                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1462                         if (store.offset[i] == 0) {
1463                                 store.offset[i] = copy_end = contents_sz;
1464                         } else if (store.state != KEY_SEEN) {
1465                                 copy_end = store.offset[i];
1466                         } else
1467                                 copy_end = find_beginning_of_line(
1468                                         contents, contents_sz,
1469                                         store.offset[i]-2, &new_line);
1470
1471                         if (copy_end > 0 && contents[copy_end-1] != '\n')
1472                                 new_line = 1;
1473
1474                         /* write the first part of the config */
1475                         if (copy_end > copy_begin) {
1476                                 if (write_in_full(fd, contents + copy_begin,
1477                                                   copy_end - copy_begin) <
1478                                     copy_end - copy_begin)
1479                                         goto write_err_out;
1480                                 if (new_line &&
1481                                     write_str_in_full(fd, "\n") != 1)
1482                                         goto write_err_out;
1483                         }
1484                         copy_begin = store.offset[i];
1485                 }
1486
1487                 /* write the pair (value == NULL means unset) */
1488                 if (value != NULL) {
1489                         if (store.state == START) {
1490                                 if (!store_write_section(fd, key))
1491                                         goto write_err_out;
1492                         }
1493                         if (!store_write_pair(fd, key, value))
1494                                 goto write_err_out;
1495                 }
1496
1497                 /* write the rest of the config */
1498                 if (copy_begin < contents_sz)
1499                         if (write_in_full(fd, contents + copy_begin,
1500                                           contents_sz - copy_begin) <
1501                             contents_sz - copy_begin)
1502                                 goto write_err_out;
1503
1504                 munmap(contents, contents_sz);
1505         }
1506
1507         if (commit_lock_file(lock) < 0) {
1508                 error("could not commit config file %s", config_filename);
1509                 ret = CONFIG_NO_WRITE;
1510                 goto out_free;
1511         }
1512
1513         /*
1514          * lock is committed, so don't try to roll it back below.
1515          * NOTE: Since lockfile.c keeps a linked list of all created
1516          * lock_file structures, it isn't safe to free(lock).  It's
1517          * better to just leave it hanging around.
1518          */
1519         lock = NULL;
1520         ret = 0;
1521
1522 out_free:
1523         if (lock)
1524                 rollback_lock_file(lock);
1525         free(filename_buf);
1526         return ret;
1527
1528 write_err_out:
1529         ret = write_error(lock->filename);
1530         goto out_free;
1531
1532 }
1533
1534 int git_config_set_multivar(const char *key, const char *value,
1535                         const char *value_regex, int multi_replace)
1536 {
1537         return git_config_set_multivar_in_file(NULL, key, value, value_regex,
1538                                                multi_replace);
1539 }
1540
1541 static int section_name_match (const char *buf, const char *name)
1542 {
1543         int i = 0, j = 0, dot = 0;
1544         if (buf[i] != '[')
1545                 return 0;
1546         for (i = 1; buf[i] && buf[i] != ']'; i++) {
1547                 if (!dot && isspace(buf[i])) {
1548                         dot = 1;
1549                         if (name[j++] != '.')
1550                                 break;
1551                         for (i++; isspace(buf[i]); i++)
1552                                 ; /* do nothing */
1553                         if (buf[i] != '"')
1554                                 break;
1555                         continue;
1556                 }
1557                 if (buf[i] == '\\' && dot)
1558                         i++;
1559                 else if (buf[i] == '"' && dot) {
1560                         for (i++; isspace(buf[i]); i++)
1561                                 ; /* do_nothing */
1562                         break;
1563                 }
1564                 if (buf[i] != name[j++])
1565                         break;
1566         }
1567         if (buf[i] == ']' && name[j] == 0) {
1568                 /*
1569                  * We match, now just find the right length offset by
1570                  * gobbling up any whitespace after it, as well
1571                  */
1572                 i++;
1573                 for (; buf[i] && isspace(buf[i]); i++)
1574                         ; /* do nothing */
1575                 return i;
1576         }
1577         return 0;
1578 }
1579
1580 static int section_name_is_ok(const char *name)
1581 {
1582         /* Empty section names are bogus. */
1583         if (!*name)
1584                 return 0;
1585
1586         /*
1587          * Before a dot, we must be alphanumeric or dash. After the first dot,
1588          * anything goes, so we can stop checking.
1589          */
1590         for (; *name && *name != '.'; name++)
1591                 if (*name != '-' && !isalnum(*name))
1592                         return 0;
1593         return 1;
1594 }
1595
1596 /* if new_name == NULL, the section is removed instead */
1597 int git_config_rename_section_in_file(const char *config_filename,
1598                                       const char *old_name, const char *new_name)
1599 {
1600         int ret = 0, remove = 0;
1601         char *filename_buf = NULL;
1602         struct lock_file *lock;
1603         int out_fd;
1604         char buf[1024];
1605         FILE *config_file;
1606
1607         if (new_name && !section_name_is_ok(new_name)) {
1608                 ret = error("invalid section name: %s", new_name);
1609                 goto out;
1610         }
1611
1612         if (!config_filename)
1613                 config_filename = filename_buf = git_pathdup("config");
1614
1615         lock = xcalloc(sizeof(struct lock_file), 1);
1616         out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1617         if (out_fd < 0) {
1618                 ret = error("could not lock config file %s", config_filename);
1619                 goto out;
1620         }
1621
1622         if (!(config_file = fopen(config_filename, "rb"))) {
1623                 /* no config file means nothing to rename, no error */
1624                 goto unlock_and_out;
1625         }
1626
1627         while (fgets(buf, sizeof(buf), config_file)) {
1628                 int i;
1629                 int length;
1630                 char *output = buf;
1631                 for (i = 0; buf[i] && isspace(buf[i]); i++)
1632                         ; /* do nothing */
1633                 if (buf[i] == '[') {
1634                         /* it's a section */
1635                         int offset = section_name_match(&buf[i], old_name);
1636                         if (offset > 0) {
1637                                 ret++;
1638                                 if (new_name == NULL) {
1639                                         remove = 1;
1640                                         continue;
1641                                 }
1642                                 store.baselen = strlen(new_name);
1643                                 if (!store_write_section(out_fd, new_name)) {
1644                                         ret = write_error(lock->filename);
1645                                         goto out;
1646                                 }
1647                                 /*
1648                                  * We wrote out the new section, with
1649                                  * a newline, now skip the old
1650                                  * section's length
1651                                  */
1652                                 output += offset + i;
1653                                 if (strlen(output) > 0) {
1654                                         /*
1655                                          * More content means there's
1656                                          * a declaration to put on the
1657                                          * next line; indent with a
1658                                          * tab
1659                                          */
1660                                         output -= 1;
1661                                         output[0] = '\t';
1662                                 }
1663                         }
1664                         remove = 0;
1665                 }
1666                 if (remove)
1667                         continue;
1668                 length = strlen(output);
1669                 if (write_in_full(out_fd, output, length) != length) {
1670                         ret = write_error(lock->filename);
1671                         goto out;
1672                 }
1673         }
1674         fclose(config_file);
1675 unlock_and_out:
1676         if (commit_lock_file(lock) < 0)
1677                 ret = error("could not commit config file %s", config_filename);
1678 out:
1679         free(filename_buf);
1680         return ret;
1681 }
1682
1683 int git_config_rename_section(const char *old_name, const char *new_name)
1684 {
1685         return git_config_rename_section_in_file(NULL, old_name, new_name);
1686 }
1687
1688 /*
1689  * Call this to report error for your variable that should not
1690  * get a boolean value (i.e. "[my] var" means "true").
1691  */
1692 #undef config_error_nonbool
1693 int config_error_nonbool(const char *var)
1694 {
1695         return error("Missing value for '%s'", var);
1696 }
1697
1698 int parse_config_key(const char *var,
1699                      const char *section,
1700                      const char **subsection, int *subsection_len,
1701                      const char **key)
1702 {
1703         int section_len = strlen(section);
1704         const char *dot;
1705
1706         /* Does it start with "section." ? */
1707         if (prefixcmp(var, section) || var[section_len] != '.')
1708                 return -1;
1709
1710         /*
1711          * Find the key; we don't know yet if we have a subsection, but we must
1712          * parse backwards from the end, since the subsection may have dots in
1713          * it, too.
1714          */
1715         dot = strrchr(var, '.');
1716         *key = dot + 1;
1717
1718         /* Did we have a subsection at all? */
1719         if (dot == var + section_len) {
1720                 *subsection = NULL;
1721                 *subsection_len = 0;
1722         }
1723         else {
1724                 *subsection = var + section_len + 1;
1725                 *subsection_len = dot - *subsection;
1726         }
1727
1728         return 0;
1729 }