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 #define MAXNAME (256)
  14
  15 static FILE *config_file;
  16 static const char *config_file_name;
  17 static int config_linenr;
  18 static int config_file_eof;
  19 static int zlib_compression_seen;
  20
  21 const char *config_exclusive_filename = NULL;
  22
  23 struct config_item
  24 {
  25         struct config_item *next;
  26         char *name;
  27         char *value;
  28 };
  29 static struct config_item *config_parameters;
  30 static struct config_item **config_parameters_tail = &config_parameters;
  31
  32 static void lowercase(char *p)
  33 {
  34         for (; *p; p++)
  35                 *p = tolower(*p);
  36 }
  37
  38 void git_config_push_parameter(const char *text)
  39 {
  40         struct strbuf env = STRBUF_INIT;
  41         const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
  42         if (old) {
  43                 strbuf_addstr(&env, old);
  44                 strbuf_addch(&env, ' ');
  45         }
  46         sq_quote_buf(&env, text);
  47         setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
  48         strbuf_release(&env);
  49 }
  50
  51 int git_config_parse_parameter(const char *text)
  52 {
  53         struct config_item *ct;
  54         struct strbuf tmp = STRBUF_INIT;
  55         struct strbuf **pair;
  56         strbuf_addstr(&tmp, text);
  57         pair = strbuf_split(&tmp, '=');
  58         if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
  59                 strbuf_setlen(pair[0], pair[0]->len - 1);
  60         strbuf_trim(pair[0]);
  61         if (!pair[0]->len) {
  62                 strbuf_list_free(pair);
  63                 return -1;
  64         }
  65         ct = xcalloc(1, sizeof(struct config_item));
  66         ct->name = strbuf_detach(pair[0], NULL);
  67         if (pair[1]) {
  68                 strbuf_trim(pair[1]);
  69                 ct->value = strbuf_detach(pair[1], NULL);
  70         }
  71         strbuf_list_free(pair);
  72         lowercase(ct->name);
  73         *config_parameters_tail = ct;
  74         config_parameters_tail = &ct->next;
  75         return 0;
  76 }
  77
  78 int git_config_parse_environment(void) {
  79         const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
  80         char *envw;
  81         const char **argv = NULL;
  82         int nr = 0, alloc = 0;
  83         int i;
  84
  85         if (!env)
  86                 return 0;
  87         /* sq_dequote will write over it */
  88         envw = xstrdup(env);
  89
  90         if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
  91                 free(envw);
  92                 return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
  93         }
  94
  95         for (i = 0; i < nr; i++) {
  96                 if (git_config_parse_parameter(argv[i]) < 0) {
  97                         error("bogus config parameter: %s", argv[i]);
  98                         free(argv);
  99                         free(envw);
 100                         return -1;
 101                 }
 102         }
 103
 104         free(argv);
 105         free(envw);
 106         return 0;
 107 }
 108
 109 static int get_next_char(void)
 110 {
 111         int c;
 112         FILE *f;
 113
 114         c = '\n';
 115         if ((f = config_file) != NULL) {
 116                 c = fgetc(f);
 117                 if (c == '\r') {
 118                         /* DOS like systems */
 119                         c = fgetc(f);
 120                         if (c != '\n') {
 121                                 ungetc(c, f);
 122                                 c = '\r';
 123                         }
 124                 }
 125                 if (c == '\n')
 126                         config_linenr++;
 127                 if (c == EOF) {
 128                         config_file_eof = 1;
 129                         c = '\n';
 130                 }
 131         }
 132         return c;
 133 }
 134
 135 static char *parse_value(void)
 136 {
 137         static char value[1024];
 138         int quote = 0, comment = 0, len = 0, space = 0;
 139
 140         for (;;) {
 141                 int c = get_next_char();
 142                 if (len >= sizeof(value) - 1)
 143                         return NULL;
 144                 if (c == '\n') {
 145                         if (quote)
 146                                 return NULL;
 147                         value[len] = 0;
 148                         return value;
 149                 }
 150                 if (comment)
 151                         continue;
 152                 if (isspace(c) && !quote) {
 153                         if (len)
 154                                 space++;
 155                         continue;
 156                 }
 157                 if (!quote) {
 158                         if (c == ';' || c == '#') {
 159                                 comment = 1;
 160                                 continue;
 161                         }
 162                 }
 163                 for (; space; space--)
 164                         value[len++] = ' ';
 165                 if (c == '\\') {
 166                         c = get_next_char();
 167                         switch (c) {
 168                         case '\n':
 169                                 continue;
 170                         case 't':
 171                                 c = '\t';
 172                                 break;
 173                         case 'b':
 174                                 c = '\b';
 175                                 break;
 176                         case 'n':
 177                                 c = '\n';
 178                                 break;
 179                         /* Some characters escape as themselves */
 180                         case '\\': case '"':
 181                                 break;
 182                         /* Reject unknown escape sequences */
 183                         default:
 184                                 return NULL;
 185                         }
 186                         value[len++] = c;
 187                         continue;
 188                 }
 189                 if (c == '"') {
 190                         quote = 1-quote;
 191                         continue;
 192                 }
 193                 value[len++] = c;
 194         }
 195 }
 196
 197 static inline int iskeychar(int c)
 198 {
 199         return isalnum(c) || c == '-';
 200 }
 201
 202 static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
 203 {
 204         int c;
 205         char *value;
 206
 207         /* Get the full name */
 208         for (;;) {
 209                 c = get_next_char();
 210                 if (config_file_eof)
 211                         break;
 212                 if (!iskeychar(c))
 213                         break;
 214                 name[len++] = tolower(c);
 215                 if (len >= MAXNAME)
 216                         return -1;
 217         }
 218         name[len] = 0;
 219         while (c == ' ' || c == '\t')
 220                 c = get_next_char();
 221
 222         value = NULL;
 223         if (c != '\n') {
 224                 if (c != '=')
 225                         return -1;
 226                 value = parse_value();
 227                 if (!value)
 228                         return -1;
 229         }
 230         return fn(name, value, data);
 231 }
 232
 233 static int get_extended_base_var(char *name, int baselen, int c)
 234 {
 235         do {
 236                 if (c == '\n')
 237                         return -1;
 238                 c = get_next_char();
 239         } while (isspace(c));
 240
 241         /* We require the format to be '[base "extension"]' */
 242         if (c != '"')
 243                 return -1;
 244         name[baselen++] = '.';
 245
 246         for (;;) {
 247                 int c = get_next_char();
 248                 if (c == '\n')
 249                         return -1;
 250                 if (c == '"')
 251                         break;
 252                 if (c == '\\') {
 253                         c = get_next_char();
 254                         if (c == '\n')
 255                                 return -1;
 256                 }
 257                 name[baselen++] = c;
 258                 if (baselen > MAXNAME / 2)
 259                         return -1;
 260         }
 261
 262         /* Final ']' */
 263         if (get_next_char() != ']')
 264                 return -1;
 265         return baselen;
 266 }
 267
 268 static int get_base_var(char *name)
 269 {
 270         int baselen = 0;
 271
 272         for (;;) {
 273                 int c = get_next_char();
 274                 if (config_file_eof)
 275                         return -1;
 276                 if (c == ']')
 277                         return baselen;
 278                 if (isspace(c))
 279                         return get_extended_base_var(name, baselen, c);
 280                 if (!iskeychar(c) && c != '.')
 281                         return -1;
 282                 if (baselen > MAXNAME / 2)
 283                         return -1;
 284                 name[baselen++] = tolower(c);
 285         }
 286 }
 287
 288 static int git_parse_file(config_fn_t fn, void *data)
 289 {
 290         int comment = 0;
 291         int baselen = 0;
 292         static char var[MAXNAME];
 293
 294         /* U+FEFF Byte Order Mark in UTF8 */
 295         static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 296         const unsigned char *bomptr = utf8_bom;
 297
 298         for (;;) {
 299                 int c = get_next_char();
 300                 if (bomptr && *bomptr) {
 301                         /* We are at the file beginning; skip UTF8-encoded BOM
 302                          * if present. Sane editors won't put this in on their
 303                          * own, but e.g. Windows Notepad will do it happily. */
 304                         if ((unsigned char) c == *bomptr) {
 305                                 bomptr++;
 306                                 continue;
 307                         } else {
 308                                 /* Do not tolerate partial BOM. */
 309                                 if (bomptr != utf8_bom)
 310                                         break;
 311                                 /* No BOM at file beginning. Cool. */
 312                                 bomptr = NULL;
 313                         }
 314                 }
 315                 if (c == '\n') {
 316                         if (config_file_eof)
 317                                 return 0;
 318                         comment = 0;
 319                         continue;
 320                 }
 321                 if (comment || isspace(c))
 322                         continue;
 323                 if (c == '#' || c == ';') {
 324                         comment = 1;
 325                         continue;
 326                 }
 327                 if (c == '[') {
 328                         baselen = get_base_var(var);
 329                         if (baselen <= 0)
 330                                 break;
 331                         var[baselen++] = '.';
 332                         var[baselen] = 0;
 333                         continue;
 334                 }
 335                 if (!isalpha(c))
 336                         break;
 337                 var[baselen] = tolower(c);
 338                 if (get_value(fn, data, var, baselen+1) < 0)
 339                         break;
 340         }
 341         die("bad config file line %d in %s", config_linenr, config_file_name);
 342 }
 343
 344 static int parse_unit_factor(const char *end, unsigned long *val)
 345 {
 346         if (!*end)
 347                 return 1;
 348         else if (!strcasecmp(end, "k")) {
 349                 *val *= 1024;
 350                 return 1;
 351         }
 352         else if (!strcasecmp(end, "m")) {
 353                 *val *= 1024 * 1024;
 354                 return 1;
 355         }
 356         else if (!strcasecmp(end, "g")) {
 357                 *val *= 1024 * 1024 * 1024;
 358                 return 1;
 359         }
 360         return 0;
 361 }
 362
 363 static int git_parse_long(const char *value, long *ret)
 364 {
 365         if (value && *value) {
 366                 char *end;
 367                 long val = strtol(value, &end, 0);
 368                 unsigned long factor = 1;
 369                 if (!parse_unit_factor(end, &factor))
 370                         return 0;
 371                 *ret = val * factor;
 372                 return 1;
 373         }
 374         return 0;
 375 }
 376
 377 int git_parse_ulong(const char *value, unsigned long *ret)
 378 {
 379         if (value && *value) {
 380                 char *end;
 381                 unsigned long val = strtoul(value, &end, 0);
 382                 if (!parse_unit_factor(end, &val))
 383                         return 0;
 384                 *ret = val;
 385                 return 1;
 386         }
 387         return 0;
 388 }
 389
 390 static void die_bad_config(const char *name)
 391 {
 392         if (config_file_name)
 393                 die("bad config value for '%s' in %s", name, config_file_name);
 394         die("bad config value for '%s'", name);
 395 }
 396
 397 int git_config_int(const char *name, const char *value)
 398 {
 399         long ret = 0;
 400         if (!git_parse_long(value, &ret))
 401                 die_bad_config(name);
 402         return ret;
 403 }
 404
 405 unsigned long git_config_ulong(const char *name, const char *value)
 406 {
 407         unsigned long ret;
 408         if (!git_parse_ulong(value, &ret))
 409                 die_bad_config(name);
 410         return ret;
 411 }
 412
 413 int git_config_maybe_bool(const char *name, const char *value)
 414 {
 415         if (!value)
 416                 return 1;
 417         if (!*value)
 418                 return 0;
 419         if (!strcasecmp(value, "true")
 420             || !strcasecmp(value, "yes")
 421             || !strcasecmp(value, "on"))
 422                 return 1;
 423         if (!strcasecmp(value, "false")
 424             || !strcasecmp(value, "no")
 425             || !strcasecmp(value, "off"))
 426                 return 0;
 427         return -1;
 428 }
 429
 430 int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 431 {
 432         int v = git_config_maybe_bool(name, value);
 433         if (0 <= v) {
 434                 *is_bool = 1;
 435                 return v;
 436         }
 437         *is_bool = 0;
 438         return git_config_int(name, value);
 439 }
 440
 441 int git_config_bool(const char *name, const char *value)
 442 {
 443         int discard;
 444         return !!git_config_bool_or_int(name, value, &discard);
 445 }
 446
 447 int git_config_string(const char **dest, const char *var, const char *value)
 448 {
 449         if (!value)
 450                 return config_error_nonbool(var);
 451         *dest = xstrdup(value);
 452         return 0;
 453 }
 454
 455 int git_config_pathname(const char **dest, const char *var, const char *value)
 456 {
 457         if (!value)
 458                 return config_error_nonbool(var);
 459         *dest = expand_user_path(value);
 460         if (!*dest)
 461                 die("Failed to expand user dir in: '%s'", value);
 462         return 0;
 463 }
 464
 465 static int git_default_core_config(const char *var, const char *value)
 466 {
 467         /* This needs a better name */
 468         if (!strcmp(var, "core.filemode")) {
 469                 trust_executable_bit = git_config_bool(var, value);
 470                 return 0;
 471         }
 472         if (!strcmp(var, "core.trustctime")) {
 473                 trust_ctime = git_config_bool(var, value);
 474                 return 0;
 475         }
 476
 477         if (!strcmp(var, "core.quotepath")) {
 478                 quote_path_fully = git_config_bool(var, value);
 479                 return 0;
 480         }
 481
 482         if (!strcmp(var, "core.symlinks")) {
 483                 has_symlinks = git_config_bool(var, value);
 484                 return 0;
 485         }
 486
 487         if (!strcmp(var, "core.ignorecase")) {
 488                 ignore_case = git_config_bool(var, value);
 489                 return 0;
 490         }
 491
 492         if (!strcmp(var, "core.bare")) {
 493                 is_bare_repository_cfg = git_config_bool(var, value);
 494                 return 0;
 495         }
 496
 497         if (!strcmp(var, "core.ignorestat")) {
 498                 assume_unchanged = git_config_bool(var, value);
 499                 return 0;
 500         }
 501
 502         if (!strcmp(var, "core.prefersymlinkrefs")) {
 503                 prefer_symlink_refs = git_config_bool(var, value);
 504                 return 0;
 505         }
 506
 507         if (!strcmp(var, "core.logallrefupdates")) {
 508                 log_all_ref_updates = git_config_bool(var, value);
 509                 return 0;
 510         }
 511
 512         if (!strcmp(var, "core.warnambiguousrefs")) {
 513                 warn_ambiguous_refs = git_config_bool(var, value);
 514                 return 0;
 515         }
 516
 517         if (!strcmp(var, "core.loosecompression")) {
 518                 int level = git_config_int(var, value);
 519                 if (level == -1)
 520                         level = Z_DEFAULT_COMPRESSION;
 521                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 522                         die("bad zlib compression level %d", level);
 523                 zlib_compression_level = level;
 524                 zlib_compression_seen = 1;
 525                 return 0;
 526         }
 527
 528         if (!strcmp(var, "core.compression")) {
 529                 int level = git_config_int(var, value);
 530                 if (level == -1)
 531                         level = Z_DEFAULT_COMPRESSION;
 532                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 533                         die("bad zlib compression level %d", level);
 534                 core_compression_level = level;
 535                 core_compression_seen = 1;
 536                 if (!zlib_compression_seen)
 537                         zlib_compression_level = level;
 538                 return 0;
 539         }
 540
 541         if (!strcmp(var, "core.packedgitwindowsize")) {
 542                 int pgsz_x2 = getpagesize() * 2;
 543                 packed_git_window_size = git_config_int(var, value);
 544
 545                 /* This value must be multiple of (pagesize * 2) */
 546                 packed_git_window_size /= pgsz_x2;
 547                 if (packed_git_window_size < 1)
 548                         packed_git_window_size = 1;
 549                 packed_git_window_size *= pgsz_x2;
 550                 return 0;
 551         }
 552
 553         if (!strcmp(var, "core.packedgitlimit")) {
 554                 packed_git_limit = git_config_int(var, value);
 555                 return 0;
 556         }
 557
 558         if (!strcmp(var, "core.deltabasecachelimit")) {
 559                 delta_base_cache_limit = git_config_int(var, value);
 560                 return 0;
 561         }
 562
 563         if (!strcmp(var, "core.autocrlf")) {
 564                 if (value && !strcasecmp(value, "input")) {
 565                         if (eol == EOL_CRLF)
 566                                 return error("core.autocrlf=input conflicts with core.eol=crlf");
 567                         auto_crlf = AUTO_CRLF_INPUT;
 568                         return 0;
 569                 }
 570                 auto_crlf = git_config_bool(var, value);
 571                 return 0;
 572         }
 573
 574         if (!strcmp(var, "core.safecrlf")) {
 575                 if (value && !strcasecmp(value, "warn")) {
 576                         safe_crlf = SAFE_CRLF_WARN;
 577                         return 0;
 578                 }
 579                 safe_crlf = git_config_bool(var, value);
 580                 return 0;
 581         }
 582
 583         if (!strcmp(var, "core.eol")) {
 584                 if (value && !strcasecmp(value, "lf"))
 585                         eol = EOL_LF;
 586                 else if (value && !strcasecmp(value, "crlf"))
 587                         eol = EOL_CRLF;
 588                 else if (value && !strcasecmp(value, "native"))
 589                         eol = EOL_NATIVE;
 590                 else
 591                         eol = EOL_UNSET;
 592                 if (eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 593                         return error("core.autocrlf=input conflicts with core.eol=crlf");
 594                 return 0;
 595         }
 596
 597         if (!strcmp(var, "core.notesref")) {
 598                 notes_ref_name = xstrdup(value);
 599                 return 0;
 600         }
 601
 602         if (!strcmp(var, "core.pager"))
 603                 return git_config_string(&pager_program, var, value);
 604
 605         if (!strcmp(var, "core.editor"))
 606                 return git_config_string(&editor_program, var, value);
 607
 608         if (!strcmp(var, "core.excludesfile"))
 609                 return git_config_pathname(&excludes_file, var, value);
 610
 611         if (!strcmp(var, "core.whitespace")) {
 612                 if (!value)
 613                         return config_error_nonbool(var);
 614                 whitespace_rule_cfg = parse_whitespace_rule(value);
 615                 return 0;
 616         }
 617
 618         if (!strcmp(var, "core.fsyncobjectfiles")) {
 619                 fsync_object_files = git_config_bool(var, value);
 620                 return 0;
 621         }
 622
 623         if (!strcmp(var, "core.preloadindex")) {
 624                 core_preload_index = git_config_bool(var, value);
 625                 return 0;
 626         }
 627
 628         if (!strcmp(var, "core.createobject")) {
 629                 if (!strcmp(value, "rename"))
 630                         object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 631                 else if (!strcmp(value, "link"))
 632                         object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 633                 else
 634                         die("Invalid mode for object creation: %s", value);
 635                 return 0;
 636         }
 637
 638         if (!strcmp(var, "core.sparsecheckout")) {
 639                 core_apply_sparse_checkout = git_config_bool(var, value);
 640                 return 0;
 641         }
 642
 643         /* Add other config variables here and to Documentation/config.txt. */
 644         return 0;
 645 }
 646
 647 static int git_default_user_config(const char *var, const char *value)
 648 {
 649         if (!strcmp(var, "user.name")) {
 650                 if (!value)
 651                         return config_error_nonbool(var);
 652                 strlcpy(git_default_name, value, sizeof(git_default_name));
 653                 user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 654                 return 0;
 655         }
 656
 657         if (!strcmp(var, "user.email")) {
 658                 if (!value)
 659                         return config_error_nonbool(var);
 660                 strlcpy(git_default_email, value, sizeof(git_default_email));
 661                 user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 662                 return 0;
 663         }
 664
 665         /* Add other config variables here and to Documentation/config.txt. */
 666         return 0;
 667 }
 668
 669 static int git_default_i18n_config(const char *var, const char *value)
 670 {
 671         if (!strcmp(var, "i18n.commitencoding"))
 672                 return git_config_string(&git_commit_encoding, var, value);
 673
 674         if (!strcmp(var, "i18n.logoutputencoding"))
 675                 return git_config_string(&git_log_output_encoding, var, value);
 676
 677         /* Add other config variables here and to Documentation/config.txt. */
 678         return 0;
 679 }
 680
 681 static int git_default_branch_config(const char *var, const char *value)
 682 {
 683         if (!strcmp(var, "branch.autosetupmerge")) {
 684                 if (value && !strcasecmp(value, "always")) {
 685                         git_branch_track = BRANCH_TRACK_ALWAYS;
 686                         return 0;
 687                 }
 688                 git_branch_track = git_config_bool(var, value);
 689                 return 0;
 690         }
 691         if (!strcmp(var, "branch.autosetuprebase")) {
 692                 if (!value)
 693                         return config_error_nonbool(var);
 694                 else if (!strcmp(value, "never"))
 695                         autorebase = AUTOREBASE_NEVER;
 696                 else if (!strcmp(value, "local"))
 697                         autorebase = AUTOREBASE_LOCAL;
 698                 else if (!strcmp(value, "remote"))
 699                         autorebase = AUTOREBASE_REMOTE;
 700                 else if (!strcmp(value, "always"))
 701                         autorebase = AUTOREBASE_ALWAYS;
 702                 else
 703                         return error("Malformed value for %s", var);
 704                 return 0;
 705         }
 706
 707         /* Add other config variables here and to Documentation/config.txt. */
 708         return 0;
 709 }
 710
 711 static int git_default_push_config(const char *var, const char *value)
 712 {
 713         if (!strcmp(var, "push.default")) {
 714                 if (!value)
 715                         return config_error_nonbool(var);
 716                 else if (!strcmp(value, "nothing"))
 717                         push_default = PUSH_DEFAULT_NOTHING;
 718                 else if (!strcmp(value, "matching"))
 719                         push_default = PUSH_DEFAULT_MATCHING;
 720                 else if (!strcmp(value, "tracking"))
 721                         push_default = PUSH_DEFAULT_TRACKING;
 722                 else if (!strcmp(value, "current"))
 723                         push_default = PUSH_DEFAULT_CURRENT;
 724                 else {
 725                         error("Malformed value for %s: %s", var, value);
 726                         return error("Must be one of nothing, matching, "
 727                                      "tracking or current.");
 728                 }
 729                 return 0;
 730         }
 731
 732         /* Add other config variables here and to Documentation/config.txt. */
 733         return 0;
 734 }
 735
 736 static int git_default_mailmap_config(const char *var, const char *value)
 737 {
 738         if (!strcmp(var, "mailmap.file"))
 739                 return git_config_string(&git_mailmap_file, var, value);
 740
 741         /* Add other config variables here and to Documentation/config.txt. */
 742         return 0;
 743 }
 744
 745 int git_default_config(const char *var, const char *value, void *dummy)
 746 {
 747         if (!prefixcmp(var, "core."))
 748                 return git_default_core_config(var, value);
 749
 750         if (!prefixcmp(var, "user."))
 751                 return git_default_user_config(var, value);
 752
 753         if (!prefixcmp(var, "i18n."))
 754                 return git_default_i18n_config(var, value);
 755
 756         if (!prefixcmp(var, "branch."))
 757                 return git_default_branch_config(var, value);
 758
 759         if (!prefixcmp(var, "push."))
 760                 return git_default_push_config(var, value);
 761
 762         if (!prefixcmp(var, "mailmap."))
 763                 return git_default_mailmap_config(var, value);
 764
 765         if (!prefixcmp(var, "advice."))
 766                 return git_default_advice_config(var, value);
 767
 768         if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 769                 pager_use_color = git_config_bool(var,value);
 770                 return 0;
 771         }
 772
 773         /* Add other config variables here and to Documentation/config.txt. */
 774         return 0;
 775 }
 776
 777 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 778 {
 779         int ret;
 780         FILE *f = fopen(filename, "r");
 781
 782         ret = -1;
 783         if (f) {
 784                 config_file = f;
 785                 config_file_name = filename;
 786                 config_linenr = 1;
 787                 config_file_eof = 0;
 788                 ret = git_parse_file(fn, data);
 789                 fclose(f);
 790                 config_file_name = NULL;
 791         }
 792         return ret;
 793 }
 794
 795 const char *git_etc_gitconfig(void)
 796 {
 797         static const char *system_wide;
 798         if (!system_wide)
 799                 system_wide = system_path(ETC_GITCONFIG);
 800         return system_wide;
 801 }
 802
 803 int git_env_bool(const char *k, int def)
 804 {
 805         const char *v = getenv(k);
 806         return v ? git_config_bool(k, v) : def;
 807 }
 808
 809 int git_config_system(void)
 810 {
 811         return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 812 }
 813
 814 int git_config_global(void)
 815 {
 816         return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
 817 }
 818
 819 int git_config_from_parameters(config_fn_t fn, void *data)
 820 {
 821         static int loaded_environment;
 822         const struct config_item *ct;
 823
 824         if (!loaded_environment) {
 825                 if (git_config_parse_environment() < 0)
 826                         return -1;
 827                 loaded_environment = 1;
 828         }
 829         for (ct = config_parameters; ct; ct = ct->next)
 830                 if (fn(ct->name, ct->value, data) < 0)
 831                         return -1;
 832         return 0;
 833 }
 834
 835 int git_config(config_fn_t fn, void *data)
 836 {
 837         int ret = 0, found = 0;
 838         char *repo_config = NULL;
 839         const char *home = NULL;
 840
 841         /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
 842         if (config_exclusive_filename)
 843                 return git_config_from_file(fn, config_exclusive_filename, data);
 844         if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 845                 ret += git_config_from_file(fn, git_etc_gitconfig(),
 846                                             data);
 847                 found += 1;
 848         }
 849
 850         home = getenv("HOME");
 851         if (git_config_global() && home) {
 852                 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
 853                 if (!access(user_config, R_OK)) {
 854                         ret += git_config_from_file(fn, user_config, data);
 855                         found += 1;
 856                 }
 857                 free(user_config);
 858         }
 859
 860         repo_config = git_pathdup("config");
 861         if (!access(repo_config, R_OK)) {
 862                 ret += git_config_from_file(fn, repo_config, data);
 863                 found += 1;
 864         }
 865         free(repo_config);
 866
 867         ret += git_config_from_parameters(fn, data);
 868         if (config_parameters)
 869                 found += 1;
 870
 871         if (found == 0)
 872                 return -1;
 873         return ret;
 874 }
 875
 876 /*
 877  * Find all the stuff for git_config_set() below.
 878  */
 879
 880 #define MAX_MATCHES 512
 881
 882 static struct {
 883         int baselen;
 884         char *key;
 885         int do_not_match;
 886         regex_t *value_regex;
 887         int multi_replace;
 888         size_t offset[MAX_MATCHES];
 889         enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 890         int seen;
 891 } store;
 892
 893 static int matches(const char *key, const char *value)
 894 {
 895         return !strcmp(key, store.key) &&
 896                 (store.value_regex == NULL ||
 897                  (store.do_not_match ^
 898                   !regexec(store.value_regex, value, 0, NULL, 0)));
 899 }
 900
 901 static int store_aux(const char *key, const char *value, void *cb)
 902 {
 903         const char *ep;
 904         size_t section_len;
 905
 906         switch (store.state) {
 907         case KEY_SEEN:
 908                 if (matches(key, value)) {
 909                         if (store.seen == 1 && store.multi_replace == 0) {
 910                                 warning("%s has multiple values", key);
 911                         } else if (store.seen >= MAX_MATCHES) {
 912                                 error("too many matches for %s", key);
 913                                 return 1;
 914                         }
 915
 916                         store.offset[store.seen] = ftell(config_file);
 917                         store.seen++;
 918                 }
 919                 break;
 920         case SECTION_SEEN:
 921                 /*
 922                  * What we are looking for is in store.key (both
 923                  * section and var), and its section part is baselen
 924                  * long.  We found key (again, both section and var).
 925                  * We would want to know if this key is in the same
 926                  * section as what we are looking for.  We already
 927                  * know we are in the same section as what should
 928                  * hold store.key.
 929                  */
 930                 ep = strrchr(key, '.');
 931                 section_len = ep - key;
 932
 933                 if ((section_len != store.baselen) ||
 934                     memcmp(key, store.key, section_len+1)) {
 935                         store.state = SECTION_END_SEEN;
 936                         break;
 937                 }
 938
 939                 /*
 940                  * Do not increment matches: this is no match, but we
 941                  * just made sure we are in the desired section.
 942                  */
 943                 store.offset[store.seen] = ftell(config_file);
 944                 /* fallthru */
 945         case SECTION_END_SEEN:
 946         case START:
 947                 if (matches(key, value)) {
 948                         store.offset[store.seen] = ftell(config_file);
 949                         store.state = KEY_SEEN;
 950                         store.seen++;
 951                 } else {
 952                         if (strrchr(key, '.') - key == store.baselen &&
 953                               !strncmp(key, store.key, store.baselen)) {
 954                                         store.state = SECTION_SEEN;
 955                                         store.offset[store.seen] = ftell(config_file);
 956                         }
 957                 }
 958         }
 959         return 0;
 960 }
 961
 962 static int write_error(const char *filename)
 963 {
 964         error("failed to write new configuration file %s", filename);
 965
 966         /* Same error code as "failed to rename". */
 967         return 4;
 968 }
 969
 970 static int store_write_section(int fd, const char *key)
 971 {
 972         const char *dot;
 973         int i, success;
 974         struct strbuf sb = STRBUF_INIT;
 975
 976         dot = memchr(key, '.', store.baselen);
 977         if (dot) {
 978                 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
 979                 for (i = dot - key + 1; i < store.baselen; i++) {
 980                         if (key[i] == '"' || key[i] == '\\')
 981                                 strbuf_addch(&sb, '\\');
 982                         strbuf_addch(&sb, key[i]);
 983                 }
 984                 strbuf_addstr(&sb, "\"]\n");
 985         } else {
 986                 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
 987         }
 988
 989         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
 990         strbuf_release(&sb);
 991
 992         return success;
 993 }
 994
 995 static int store_write_pair(int fd, const char *key, const char *value)
 996 {
 997         int i, success;
 998         int length = strlen(key + store.baselen + 1);
 999         const char *quote = "";
1000         struct strbuf sb = STRBUF_INIT;
1001
1002         /*
1003          * Check to see if the value needs to be surrounded with a dq pair.
1004          * Note that problematic characters are always backslash-quoted; this
1005          * check is about not losing leading or trailing SP and strings that
1006          * follow beginning-of-comment characters (i.e. ';' and '#') by the
1007          * configuration parser.
1008          */
1009         if (value[0] == ' ')
1010                 quote = "\"";
1011         for (i = 0; value[i]; i++)
1012                 if (value[i] == ';' || value[i] == '#')
1013                         quote = "\"";
1014         if (i && value[i - 1] == ' ')
1015                 quote = "\"";
1016
1017         strbuf_addf(&sb, "\t%.*s = %s",
1018                     length, key + store.baselen + 1, quote);
1019
1020         for (i = 0; value[i]; i++)
1021                 switch (value[i]) {
1022                 case '\n':
1023                         strbuf_addstr(&sb, "\\n");
1024                         break;
1025                 case '\t':
1026                         strbuf_addstr(&sb, "\\t");
1027                         break;
1028                 case '"':
1029                 case '\\':
1030                         strbuf_addch(&sb, '\\');
1031                 default:
1032                         strbuf_addch(&sb, value[i]);
1033                         break;
1034                 }
1035         strbuf_addf(&sb, "%s\n", quote);
1036
1037         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1038         strbuf_release(&sb);
1039
1040         return success;
1041 }
1042
1043 static ssize_t find_beginning_of_line(const char *contents, size_t size,
1044         size_t offset_, int *found_bracket)
1045 {
1046         size_t equal_offset = size, bracket_offset = size;
1047         ssize_t offset;
1048
1049 contline:
1050         for (offset = offset_-2; offset > 0
1051                         && contents[offset] != '\n'; offset--)
1052                 switch (contents[offset]) {
1053                         case '=': equal_offset = offset; break;
1054                         case ']': bracket_offset = offset; break;
1055                 }
1056         if (offset > 0 && contents[offset-1] == '\\') {
1057                 offset_ = offset;
1058                 goto contline;
1059         }
1060         if (bracket_offset < equal_offset) {
1061                 *found_bracket = 1;
1062                 offset = bracket_offset+1;
1063         } else
1064                 offset++;
1065
1066         return offset;
1067 }
1068
1069 int git_config_set(const char *key, const char *value)
1070 {
1071         return git_config_set_multivar(key, value, NULL, 0);
1072 }
1073
1074 /*
1075  * If value==NULL, unset in (remove from) config,
1076  * if value_regex!=NULL, disregard key/value pairs where value does not match.
1077  * if multi_replace==0, nothing, or only one matching key/value is replaced,
1078  *     else all matching key/values (regardless how many) are removed,
1079  *     before the new pair is written.
1080  *
1081  * Returns 0 on success.
1082  *
1083  * This function does this:
1084  *
1085  * - it locks the config file by creating ".git/config.lock"
1086  *
1087  * - it then parses the config using store_aux() as validator to find
1088  *   the position on the key/value pair to replace. If it is to be unset,
1089  *   it must be found exactly once.
1090  *
1091  * - the config file is mmap()ed and the part before the match (if any) is
1092  *   written to the lock file, then the changed part and the rest.
1093  *
1094  * - the config file is removed and the lock file rename()d to it.
1095  *
1096  */
1097 int git_config_set_multivar(const char *key, const char *value,
1098         const char *value_regex, int multi_replace)
1099 {
1100         int i, dot;
1101         int fd = -1, in_fd;
1102         int ret;
1103         char *config_filename;
1104         struct lock_file *lock = NULL;
1105         const char *last_dot = strrchr(key, '.');
1106
1107         if (config_exclusive_filename)
1108                 config_filename = xstrdup(config_exclusive_filename);
1109         else
1110                 config_filename = git_pathdup("config");
1111
1112         /*
1113          * Since "key" actually contains the section name and the real
1114          * key name separated by a dot, we have to know where the dot is.
1115          */
1116
1117         if (last_dot == NULL) {
1118                 error("key does not contain a section: %s", key);
1119                 ret = 2;
1120                 goto out_free;
1121         }
1122         store.baselen = last_dot - key;
1123
1124         store.multi_replace = multi_replace;
1125
1126         /*
1127          * Validate the key and while at it, lower case it for matching.
1128          */
1129         store.key = xmalloc(strlen(key) + 1);
1130         dot = 0;
1131         for (i = 0; key[i]; i++) {
1132                 unsigned char c = key[i];
1133                 if (c == '.')
1134                         dot = 1;
1135                 /* Leave the extended basename untouched.. */
1136                 if (!dot || i > store.baselen) {
1137                         if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
1138                                 error("invalid key: %s", key);
1139                                 free(store.key);
1140                                 ret = 1;
1141                                 goto out_free;
1142                         }
1143                         c = tolower(c);
1144                 } else if (c == '\n') {
1145                         error("invalid key (newline): %s", key);
1146                         free(store.key);
1147                         ret = 1;
1148                         goto out_free;
1149                 }
1150                 store.key[i] = c;
1151         }
1152         store.key[i] = 0;
1153
1154         /*
1155          * The lock serves a purpose in addition to locking: the new
1156          * contents of .git/config will be written into it.
1157          */
1158         lock = xcalloc(sizeof(struct lock_file), 1);
1159         fd = hold_lock_file_for_update(lock, config_filename, 0);
1160         if (fd < 0) {
1161                 error("could not lock config file %s: %s", config_filename, strerror(errno));
1162                 free(store.key);
1163                 ret = -1;
1164                 goto out_free;
1165         }
1166
1167         /*
1168          * If .git/config does not exist yet, write a minimal version.
1169          */
1170         in_fd = open(config_filename, O_RDONLY);
1171         if ( in_fd < 0 ) {
1172                 free(store.key);
1173
1174                 if ( ENOENT != errno ) {
1175                         error("opening %s: %s", config_filename,
1176                               strerror(errno));
1177                         ret = 3; /* same as "invalid config file" */
1178                         goto out_free;
1179                 }
1180                 /* if nothing to unset, error out */
1181                 if (value == NULL) {
1182                         ret = 5;
1183                         goto out_free;
1184                 }
1185
1186                 store.key = (char *)key;
1187                 if (!store_write_section(fd, key) ||
1188                     !store_write_pair(fd, key, value))
1189                         goto write_err_out;
1190         } else {
1191                 struct stat st;
1192                 char *contents;
1193                 size_t contents_sz, copy_begin, copy_end;
1194                 int i, new_line = 0;
1195
1196                 if (value_regex == NULL)
1197                         store.value_regex = NULL;
1198                 else {
1199                         if (value_regex[0] == '!') {
1200                                 store.do_not_match = 1;
1201                                 value_regex++;
1202                         } else
1203                                 store.do_not_match = 0;
1204
1205                         store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1206                         if (regcomp(store.value_regex, value_regex,
1207                                         REG_EXTENDED)) {
1208                                 error("invalid pattern: %s", value_regex);
1209                                 free(store.value_regex);
1210                                 ret = 6;
1211                                 goto out_free;
1212                         }
1213                 }
1214
1215                 store.offset[0] = 0;
1216                 store.state = START;
1217                 store.seen = 0;
1218
1219                 /*
1220                  * After this, store.offset will contain the *end* offset
1221                  * of the last match, or remain at 0 if no match was found.
1222                  * As a side effect, we make sure to transform only a valid
1223                  * existing config file.
1224                  */
1225                 if (git_config_from_file(store_aux, config_filename, NULL)) {
1226                         error("invalid config file %s", config_filename);
1227                         free(store.key);
1228                         if (store.value_regex != NULL) {
1229                                 regfree(store.value_regex);
1230                                 free(store.value_regex);
1231                         }
1232                         ret = 3;
1233                         goto out_free;
1234                 }
1235
1236                 free(store.key);
1237                 if (store.value_regex != NULL) {
1238                         regfree(store.value_regex);
1239                         free(store.value_regex);
1240                 }
1241
1242                 /* if nothing to unset, or too many matches, error out */
1243                 if ((store.seen == 0 && value == NULL) ||
1244                                 (store.seen > 1 && multi_replace == 0)) {
1245                         ret = 5;
1246                         goto out_free;
1247                 }
1248
1249                 fstat(in_fd, &st);
1250                 contents_sz = xsize_t(st.st_size);
1251                 contents = xmmap(NULL, contents_sz, PROT_READ,
1252                         MAP_PRIVATE, in_fd, 0);
1253                 close(in_fd);
1254
1255                 if (store.seen == 0)
1256                         store.seen = 1;
1257
1258                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1259                         if (store.offset[i] == 0) {
1260                                 store.offset[i] = copy_end = contents_sz;
1261                         } else if (store.state != KEY_SEEN) {
1262                                 copy_end = store.offset[i];
1263                         } else
1264                                 copy_end = find_beginning_of_line(
1265                                         contents, contents_sz,
1266                                         store.offset[i]-2, &new_line);
1267
1268                         if (copy_end > 0 && contents[copy_end-1] != '\n')
1269                                 new_line = 1;
1270
1271                         /* write the first part of the config */
1272                         if (copy_end > copy_begin) {
1273                                 if (write_in_full(fd, contents + copy_begin,
1274                                                   copy_end - copy_begin) <
1275                                     copy_end - copy_begin)
1276                                         goto write_err_out;
1277                                 if (new_line &&
1278                                     write_str_in_full(fd, "\n") != 1)
1279                                         goto write_err_out;
1280                         }
1281                         copy_begin = store.offset[i];
1282                 }
1283
1284                 /* write the pair (value == NULL means unset) */
1285                 if (value != NULL) {
1286                         if (store.state == START) {
1287                                 if (!store_write_section(fd, key))
1288                                         goto write_err_out;
1289                         }
1290                         if (!store_write_pair(fd, key, value))
1291                                 goto write_err_out;
1292                 }
1293
1294                 /* write the rest of the config */
1295                 if (copy_begin < contents_sz)
1296                         if (write_in_full(fd, contents + copy_begin,
1297                                           contents_sz - copy_begin) <
1298                             contents_sz - copy_begin)
1299                                 goto write_err_out;
1300
1301                 munmap(contents, contents_sz);
1302         }
1303
1304         if (commit_lock_file(lock) < 0) {
1305                 error("could not commit config file %s", config_filename);
1306                 ret = 4;
1307                 goto out_free;
1308         }
1309
1310         /*
1311          * lock is committed, so don't try to roll it back below.
1312          * NOTE: Since lockfile.c keeps a linked list of all created
1313          * lock_file structures, it isn't safe to free(lock).  It's
1314          * better to just leave it hanging around.
1315          */
1316         lock = NULL;
1317         ret = 0;
1318
1319 out_free:
1320         if (lock)
1321                 rollback_lock_file(lock);
1322         free(config_filename);
1323         return ret;
1324
1325 write_err_out:
1326         ret = write_error(lock->filename);
1327         goto out_free;
1328
1329 }
1330
1331 static int section_name_match (const char *buf, const char *name)
1332 {
1333         int i = 0, j = 0, dot = 0;
1334         if (buf[i] != '[')
1335                 return 0;
1336         for (i = 1; buf[i] && buf[i] != ']'; i++) {
1337                 if (!dot && isspace(buf[i])) {
1338                         dot = 1;
1339                         if (name[j++] != '.')
1340                                 break;
1341                         for (i++; isspace(buf[i]); i++)
1342                                 ; /* do nothing */
1343                         if (buf[i] != '"')
1344                                 break;
1345                         continue;
1346                 }
1347                 if (buf[i] == '\\' && dot)
1348                         i++;
1349                 else if (buf[i] == '"' && dot) {
1350                         for (i++; isspace(buf[i]); i++)
1351                                 ; /* do_nothing */
1352                         break;
1353                 }
1354                 if (buf[i] != name[j++])
1355                         break;
1356         }
1357         if (buf[i] == ']' && name[j] == 0) {
1358                 /*
1359                  * We match, now just find the right length offset by
1360                  * gobbling up any whitespace after it, as well
1361                  */
1362                 i++;
1363                 for (; buf[i] && isspace(buf[i]); i++)
1364                         ; /* do nothing */
1365                 return i;
1366         }
1367         return 0;
1368 }
1369
1370 /* if new_name == NULL, the section is removed instead */
1371 int git_config_rename_section(const char *old_name, const char *new_name)
1372 {
1373         int ret = 0, remove = 0;
1374         char *config_filename;
1375         struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1376         int out_fd;
1377         char buf[1024];
1378
1379         if (config_exclusive_filename)
1380                 config_filename = xstrdup(config_exclusive_filename);
1381         else
1382                 config_filename = git_pathdup("config");
1383         out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1384         if (out_fd < 0) {
1385                 ret = error("could not lock config file %s", config_filename);
1386                 goto out;
1387         }
1388
1389         if (!(config_file = fopen(config_filename, "rb"))) {
1390                 /* no config file means nothing to rename, no error */
1391                 goto unlock_and_out;
1392         }
1393
1394         while (fgets(buf, sizeof(buf), config_file)) {
1395                 int i;
1396                 int length;
1397                 char *output = buf;
1398                 for (i = 0; buf[i] && isspace(buf[i]); i++)
1399                         ; /* do nothing */
1400                 if (buf[i] == '[') {
1401                         /* it's a section */
1402                         int offset = section_name_match(&buf[i], old_name);
1403                         if (offset > 0) {
1404                                 ret++;
1405                                 if (new_name == NULL) {
1406                                         remove = 1;
1407                                         continue;
1408                                 }
1409                                 store.baselen = strlen(new_name);
1410                                 if (!store_write_section(out_fd, new_name)) {
1411                                         ret = write_error(lock->filename);
1412                                         goto out;
1413                                 }
1414                                 /*
1415                                  * We wrote out the new section, with
1416                                  * a newline, now skip the old
1417                                  * section's length
1418                                  */
1419                                 output += offset + i;
1420                                 if (strlen(output) > 0) {
1421                                         /*
1422                                          * More content means there's
1423                                          * a declaration to put on the
1424                                          * next line; indent with a
1425                                          * tab
1426                                          */
1427                                         output -= 1;
1428                                         output[0] = '\t';
1429                                 }
1430                         }
1431                         remove = 0;
1432                 }
1433                 if (remove)
1434                         continue;
1435                 length = strlen(output);
1436                 if (write_in_full(out_fd, output, length) != length) {
1437                         ret = write_error(lock->filename);
1438                         goto out;
1439                 }
1440         }
1441         fclose(config_file);
1442  unlock_and_out:
1443         if (commit_lock_file(lock) < 0)
1444                 ret = error("could not commit config file %s", config_filename);
1445  out:
1446         free(config_filename);
1447         return ret;
1448 }
1449
1450 /*
1451  * Call this to report error for your variable that should not
1452  * get a boolean value (i.e. "[my] var" means "true").
1453  */
1454 int config_error_nonbool(const char *var)
1455 {
1456         return error("Missing value for '%s'", var);
1457 }