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.abbrevguard")) {
 493                 unique_abbrev_extra_length = git_config_int(var, value);
 494                 if (unique_abbrev_extra_length < 0)
 495                         unique_abbrev_extra_length = 0;
 496                 return 0;
 497         }
 498
 499         if (!strcmp(var, "core.bare")) {
 500                 is_bare_repository_cfg = git_config_bool(var, value);
 501                 return 0;
 502         }
 503
 504         if (!strcmp(var, "core.ignorestat")) {
 505                 assume_unchanged = git_config_bool(var, value);
 506                 return 0;
 507         }
 508
 509         if (!strcmp(var, "core.prefersymlinkrefs")) {
 510                 prefer_symlink_refs = git_config_bool(var, value);
 511                 return 0;
 512         }
 513
 514         if (!strcmp(var, "core.logallrefupdates")) {
 515                 log_all_ref_updates = git_config_bool(var, value);
 516                 return 0;
 517         }
 518
 519         if (!strcmp(var, "core.warnambiguousrefs")) {
 520                 warn_ambiguous_refs = git_config_bool(var, value);
 521                 return 0;
 522         }
 523
 524         if (!strcmp(var, "core.loosecompression")) {
 525                 int level = git_config_int(var, value);
 526                 if (level == -1)
 527                         level = Z_DEFAULT_COMPRESSION;
 528                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 529                         die("bad zlib compression level %d", level);
 530                 zlib_compression_level = level;
 531                 zlib_compression_seen = 1;
 532                 return 0;
 533         }
 534
 535         if (!strcmp(var, "core.compression")) {
 536                 int level = git_config_int(var, value);
 537                 if (level == -1)
 538                         level = Z_DEFAULT_COMPRESSION;
 539                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 540                         die("bad zlib compression level %d", level);
 541                 core_compression_level = level;
 542                 core_compression_seen = 1;
 543                 if (!zlib_compression_seen)
 544                         zlib_compression_level = level;
 545                 return 0;
 546         }
 547
 548         if (!strcmp(var, "core.packedgitwindowsize")) {
 549                 int pgsz_x2 = getpagesize() * 2;
 550                 packed_git_window_size = git_config_int(var, value);
 551
 552                 /* This value must be multiple of (pagesize * 2) */
 553                 packed_git_window_size /= pgsz_x2;
 554                 if (packed_git_window_size < 1)
 555                         packed_git_window_size = 1;
 556                 packed_git_window_size *= pgsz_x2;
 557                 return 0;
 558         }
 559
 560         if (!strcmp(var, "core.packedgitlimit")) {
 561                 packed_git_limit = git_config_int(var, value);
 562                 return 0;
 563         }
 564
 565         if (!strcmp(var, "core.deltabasecachelimit")) {
 566                 delta_base_cache_limit = git_config_int(var, value);
 567                 return 0;
 568         }
 569
 570         if (!strcmp(var, "core.autocrlf")) {
 571                 if (value && !strcasecmp(value, "input")) {
 572                         if (eol == EOL_CRLF)
 573                                 return error("core.autocrlf=input conflicts with core.eol=crlf");
 574                         auto_crlf = AUTO_CRLF_INPUT;
 575                         return 0;
 576                 }
 577                 auto_crlf = git_config_bool(var, value);
 578                 return 0;
 579         }
 580
 581         if (!strcmp(var, "core.safecrlf")) {
 582                 if (value && !strcasecmp(value, "warn")) {
 583                         safe_crlf = SAFE_CRLF_WARN;
 584                         return 0;
 585                 }
 586                 safe_crlf = git_config_bool(var, value);
 587                 return 0;
 588         }
 589
 590         if (!strcmp(var, "core.eol")) {
 591                 if (value && !strcasecmp(value, "lf"))
 592                         eol = EOL_LF;
 593                 else if (value && !strcasecmp(value, "crlf"))
 594                         eol = EOL_CRLF;
 595                 else if (value && !strcasecmp(value, "native"))
 596                         eol = EOL_NATIVE;
 597                 else
 598                         eol = EOL_UNSET;
 599                 if (eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 600                         return error("core.autocrlf=input conflicts with core.eol=crlf");
 601                 return 0;
 602         }
 603
 604         if (!strcmp(var, "core.notesref")) {
 605                 notes_ref_name = xstrdup(value);
 606                 return 0;
 607         }
 608
 609         if (!strcmp(var, "core.pager"))
 610                 return git_config_string(&pager_program, var, value);
 611
 612         if (!strcmp(var, "core.editor"))
 613                 return git_config_string(&editor_program, var, value);
 614
 615         if (!strcmp(var, "core.askpass"))
 616                 return git_config_string(&askpass_program, var, value);
 617
 618         if (!strcmp(var, "core.excludesfile"))
 619                 return git_config_pathname(&excludes_file, var, value);
 620
 621         if (!strcmp(var, "core.whitespace")) {
 622                 if (!value)
 623                         return config_error_nonbool(var);
 624                 whitespace_rule_cfg = parse_whitespace_rule(value);
 625                 return 0;
 626         }
 627
 628         if (!strcmp(var, "core.fsyncobjectfiles")) {
 629                 fsync_object_files = git_config_bool(var, value);
 630                 return 0;
 631         }
 632
 633         if (!strcmp(var, "core.preloadindex")) {
 634                 core_preload_index = git_config_bool(var, value);
 635                 return 0;
 636         }
 637
 638         if (!strcmp(var, "core.createobject")) {
 639                 if (!strcmp(value, "rename"))
 640                         object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 641                 else if (!strcmp(value, "link"))
 642                         object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 643                 else
 644                         die("Invalid mode for object creation: %s", value);
 645                 return 0;
 646         }
 647
 648         if (!strcmp(var, "core.sparsecheckout")) {
 649                 core_apply_sparse_checkout = git_config_bool(var, value);
 650                 return 0;
 651         }
 652
 653         /* Add other config variables here and to Documentation/config.txt. */
 654         return 0;
 655 }
 656
 657 static int git_default_user_config(const char *var, const char *value)
 658 {
 659         if (!strcmp(var, "user.name")) {
 660                 if (!value)
 661                         return config_error_nonbool(var);
 662                 strlcpy(git_default_name, value, sizeof(git_default_name));
 663                 user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 664                 return 0;
 665         }
 666
 667         if (!strcmp(var, "user.email")) {
 668                 if (!value)
 669                         return config_error_nonbool(var);
 670                 strlcpy(git_default_email, value, sizeof(git_default_email));
 671                 user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 672                 return 0;
 673         }
 674
 675         /* Add other config variables here and to Documentation/config.txt. */
 676         return 0;
 677 }
 678
 679 static int git_default_i18n_config(const char *var, const char *value)
 680 {
 681         if (!strcmp(var, "i18n.commitencoding"))
 682                 return git_config_string(&git_commit_encoding, var, value);
 683
 684         if (!strcmp(var, "i18n.logoutputencoding"))
 685                 return git_config_string(&git_log_output_encoding, var, value);
 686
 687         /* Add other config variables here and to Documentation/config.txt. */
 688         return 0;
 689 }
 690
 691 static int git_default_branch_config(const char *var, const char *value)
 692 {
 693         if (!strcmp(var, "branch.autosetupmerge")) {
 694                 if (value && !strcasecmp(value, "always")) {
 695                         git_branch_track = BRANCH_TRACK_ALWAYS;
 696                         return 0;
 697                 }
 698                 git_branch_track = git_config_bool(var, value);
 699                 return 0;
 700         }
 701         if (!strcmp(var, "branch.autosetuprebase")) {
 702                 if (!value)
 703                         return config_error_nonbool(var);
 704                 else if (!strcmp(value, "never"))
 705                         autorebase = AUTOREBASE_NEVER;
 706                 else if (!strcmp(value, "local"))
 707                         autorebase = AUTOREBASE_LOCAL;
 708                 else if (!strcmp(value, "remote"))
 709                         autorebase = AUTOREBASE_REMOTE;
 710                 else if (!strcmp(value, "always"))
 711                         autorebase = AUTOREBASE_ALWAYS;
 712                 else
 713                         return error("Malformed value for %s", var);
 714                 return 0;
 715         }
 716
 717         /* Add other config variables here and to Documentation/config.txt. */
 718         return 0;
 719 }
 720
 721 static int git_default_push_config(const char *var, const char *value)
 722 {
 723         if (!strcmp(var, "push.default")) {
 724                 if (!value)
 725                         return config_error_nonbool(var);
 726                 else if (!strcmp(value, "nothing"))
 727                         push_default = PUSH_DEFAULT_NOTHING;
 728                 else if (!strcmp(value, "matching"))
 729                         push_default = PUSH_DEFAULT_MATCHING;
 730                 else if (!strcmp(value, "tracking"))
 731                         push_default = PUSH_DEFAULT_TRACKING;
 732                 else if (!strcmp(value, "current"))
 733                         push_default = PUSH_DEFAULT_CURRENT;
 734                 else {
 735                         error("Malformed value for %s: %s", var, value);
 736                         return error("Must be one of nothing, matching, "
 737                                      "tracking or current.");
 738                 }
 739                 return 0;
 740         }
 741
 742         /* Add other config variables here and to Documentation/config.txt. */
 743         return 0;
 744 }
 745
 746 static int git_default_mailmap_config(const char *var, const char *value)
 747 {
 748         if (!strcmp(var, "mailmap.file"))
 749                 return git_config_string(&git_mailmap_file, var, value);
 750
 751         /* Add other config variables here and to Documentation/config.txt. */
 752         return 0;
 753 }
 754
 755 int git_default_config(const char *var, const char *value, void *dummy)
 756 {
 757         if (!prefixcmp(var, "core."))
 758                 return git_default_core_config(var, value);
 759
 760         if (!prefixcmp(var, "user."))
 761                 return git_default_user_config(var, value);
 762
 763         if (!prefixcmp(var, "i18n."))
 764                 return git_default_i18n_config(var, value);
 765
 766         if (!prefixcmp(var, "branch."))
 767                 return git_default_branch_config(var, value);
 768
 769         if (!prefixcmp(var, "push."))
 770                 return git_default_push_config(var, value);
 771
 772         if (!prefixcmp(var, "mailmap."))
 773                 return git_default_mailmap_config(var, value);
 774
 775         if (!prefixcmp(var, "advice."))
 776                 return git_default_advice_config(var, value);
 777
 778         if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 779                 pager_use_color = git_config_bool(var,value);
 780                 return 0;
 781         }
 782
 783         /* Add other config variables here and to Documentation/config.txt. */
 784         return 0;
 785 }
 786
 787 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 788 {
 789         int ret;
 790         FILE *f = fopen(filename, "r");
 791
 792         ret = -1;
 793         if (f) {
 794                 config_file = f;
 795                 config_file_name = filename;
 796                 config_linenr = 1;
 797                 config_file_eof = 0;
 798                 ret = git_parse_file(fn, data);
 799                 fclose(f);
 800                 config_file_name = NULL;
 801         }
 802         return ret;
 803 }
 804
 805 const char *git_etc_gitconfig(void)
 806 {
 807         static const char *system_wide;
 808         if (!system_wide)
 809                 system_wide = system_path(ETC_GITCONFIG);
 810         return system_wide;
 811 }
 812
 813 int git_env_bool(const char *k, int def)
 814 {
 815         const char *v = getenv(k);
 816         return v ? git_config_bool(k, v) : def;
 817 }
 818
 819 int git_config_system(void)
 820 {
 821         return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 822 }
 823
 824 int git_config_global(void)
 825 {
 826         return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
 827 }
 828
 829 int git_config_from_parameters(config_fn_t fn, void *data)
 830 {
 831         static int loaded_environment;
 832         const struct config_item *ct;
 833
 834         if (!loaded_environment) {
 835                 if (git_config_parse_environment() < 0)
 836                         return -1;
 837                 loaded_environment = 1;
 838         }
 839         for (ct = config_parameters; ct; ct = ct->next)
 840                 if (fn(ct->name, ct->value, data) < 0)
 841                         return -1;
 842         return 0;
 843 }
 844
 845 int git_config(config_fn_t fn, void *data)
 846 {
 847         int ret = 0, found = 0;
 848         char *repo_config = NULL;
 849         const char *home = NULL;
 850
 851         /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
 852         if (config_exclusive_filename)
 853                 return git_config_from_file(fn, config_exclusive_filename, data);
 854         if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 855                 ret += git_config_from_file(fn, git_etc_gitconfig(),
 856                                             data);
 857                 found += 1;
 858         }
 859
 860         home = getenv("HOME");
 861         if (git_config_global() && home) {
 862                 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
 863                 if (!access(user_config, R_OK)) {
 864                         ret += git_config_from_file(fn, user_config, data);
 865                         found += 1;
 866                 }
 867                 free(user_config);
 868         }
 869
 870         repo_config = git_pathdup("config");
 871         if (!access(repo_config, R_OK)) {
 872                 ret += git_config_from_file(fn, repo_config, data);
 873                 found += 1;
 874         }
 875         free(repo_config);
 876
 877         ret += git_config_from_parameters(fn, data);
 878         if (config_parameters)
 879                 found += 1;
 880
 881         return ret == 0 ? found : ret;
 882 }
 883
 884 /*
 885  * Find all the stuff for git_config_set() below.
 886  */
 887
 888 #define MAX_MATCHES 512
 889
 890 static struct {
 891         int baselen;
 892         char *key;
 893         int do_not_match;
 894         regex_t *value_regex;
 895         int multi_replace;
 896         size_t offset[MAX_MATCHES];
 897         enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 898         int seen;
 899 } store;
 900
 901 static int matches(const char *key, const char *value)
 902 {
 903         return !strcmp(key, store.key) &&
 904                 (store.value_regex == NULL ||
 905                  (store.do_not_match ^
 906                   !regexec(store.value_regex, value, 0, NULL, 0)));
 907 }
 908
 909 static int store_aux(const char *key, const char *value, void *cb)
 910 {
 911         const char *ep;
 912         size_t section_len;
 913
 914         switch (store.state) {
 915         case KEY_SEEN:
 916                 if (matches(key, value)) {
 917                         if (store.seen == 1 && store.multi_replace == 0) {
 918                                 warning("%s has multiple values", key);
 919                         } else if (store.seen >= MAX_MATCHES) {
 920                                 error("too many matches for %s", key);
 921                                 return 1;
 922                         }
 923
 924                         store.offset[store.seen] = ftell(config_file);
 925                         store.seen++;
 926                 }
 927                 break;
 928         case SECTION_SEEN:
 929                 /*
 930                  * What we are looking for is in store.key (both
 931                  * section and var), and its section part is baselen
 932                  * long.  We found key (again, both section and var).
 933                  * We would want to know if this key is in the same
 934                  * section as what we are looking for.  We already
 935                  * know we are in the same section as what should
 936                  * hold store.key.
 937                  */
 938                 ep = strrchr(key, '.');
 939                 section_len = ep - key;
 940
 941                 if ((section_len != store.baselen) ||
 942                     memcmp(key, store.key, section_len+1)) {
 943                         store.state = SECTION_END_SEEN;
 944                         break;
 945                 }
 946
 947                 /*
 948                  * Do not increment matches: this is no match, but we
 949                  * just made sure we are in the desired section.
 950                  */
 951                 store.offset[store.seen] = ftell(config_file);
 952                 /* fallthru */
 953         case SECTION_END_SEEN:
 954         case START:
 955                 if (matches(key, value)) {
 956                         store.offset[store.seen] = ftell(config_file);
 957                         store.state = KEY_SEEN;
 958                         store.seen++;
 959                 } else {
 960                         if (strrchr(key, '.') - key == store.baselen &&
 961                               !strncmp(key, store.key, store.baselen)) {
 962                                         store.state = SECTION_SEEN;
 963                                         store.offset[store.seen] = ftell(config_file);
 964                         }
 965                 }
 966         }
 967         return 0;
 968 }
 969
 970 static int write_error(const char *filename)
 971 {
 972         error("failed to write new configuration file %s", filename);
 973
 974         /* Same error code as "failed to rename". */
 975         return 4;
 976 }
 977
 978 static int store_write_section(int fd, const char *key)
 979 {
 980         const char *dot;
 981         int i, success;
 982         struct strbuf sb = STRBUF_INIT;
 983
 984         dot = memchr(key, '.', store.baselen);
 985         if (dot) {
 986                 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
 987                 for (i = dot - key + 1; i < store.baselen; i++) {
 988                         if (key[i] == '"' || key[i] == '\\')
 989                                 strbuf_addch(&sb, '\\');
 990                         strbuf_addch(&sb, key[i]);
 991                 }
 992                 strbuf_addstr(&sb, "\"]\n");
 993         } else {
 994                 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
 995         }
 996
 997         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
 998         strbuf_release(&sb);
 999
1000         return success;
1001 }
1002
1003 static int store_write_pair(int fd, const char *key, const char *value)
1004 {
1005         int i, success;
1006         int length = strlen(key + store.baselen + 1);
1007         const char *quote = "";
1008         struct strbuf sb = STRBUF_INIT;
1009
1010         /*
1011          * Check to see if the value needs to be surrounded with a dq pair.
1012          * Note that problematic characters are always backslash-quoted; this
1013          * check is about not losing leading or trailing SP and strings that
1014          * follow beginning-of-comment characters (i.e. ';' and '#') by the
1015          * configuration parser.
1016          */
1017         if (value[0] == ' ')
1018                 quote = "\"";
1019         for (i = 0; value[i]; i++)
1020                 if (value[i] == ';' || value[i] == '#')
1021                         quote = "\"";
1022         if (i && value[i - 1] == ' ')
1023                 quote = "\"";
1024
1025         strbuf_addf(&sb, "\t%.*s = %s",
1026                     length, key + store.baselen + 1, quote);
1027
1028         for (i = 0; value[i]; i++)
1029                 switch (value[i]) {
1030                 case '\n':
1031                         strbuf_addstr(&sb, "\\n");
1032                         break;
1033                 case '\t':
1034                         strbuf_addstr(&sb, "\\t");
1035                         break;
1036                 case '"':
1037                 case '\\':
1038                         strbuf_addch(&sb, '\\');
1039                 default:
1040                         strbuf_addch(&sb, value[i]);
1041                         break;
1042                 }
1043         strbuf_addf(&sb, "%s\n", quote);
1044
1045         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1046         strbuf_release(&sb);
1047
1048         return success;
1049 }
1050
1051 static ssize_t find_beginning_of_line(const char *contents, size_t size,
1052         size_t offset_, int *found_bracket)
1053 {
1054         size_t equal_offset = size, bracket_offset = size;
1055         ssize_t offset;
1056
1057 contline:
1058         for (offset = offset_-2; offset > 0
1059                         && contents[offset] != '\n'; offset--)
1060                 switch (contents[offset]) {
1061                         case '=': equal_offset = offset; break;
1062                         case ']': bracket_offset = offset; break;
1063                 }
1064         if (offset > 0 && contents[offset-1] == '\\') {
1065                 offset_ = offset;
1066                 goto contline;
1067         }
1068         if (bracket_offset < equal_offset) {
1069                 *found_bracket = 1;
1070                 offset = bracket_offset+1;
1071         } else
1072                 offset++;
1073
1074         return offset;
1075 }
1076
1077 int git_config_set(const char *key, const char *value)
1078 {
1079         return git_config_set_multivar(key, value, NULL, 0);
1080 }
1081
1082 /*
1083  * If value==NULL, unset in (remove from) config,
1084  * if value_regex!=NULL, disregard key/value pairs where value does not match.
1085  * if multi_replace==0, nothing, or only one matching key/value is replaced,
1086  *     else all matching key/values (regardless how many) are removed,
1087  *     before the new pair is written.
1088  *
1089  * Returns 0 on success.
1090  *
1091  * This function does this:
1092  *
1093  * - it locks the config file by creating ".git/config.lock"
1094  *
1095  * - it then parses the config using store_aux() as validator to find
1096  *   the position on the key/value pair to replace. If it is to be unset,
1097  *   it must be found exactly once.
1098  *
1099  * - the config file is mmap()ed and the part before the match (if any) is
1100  *   written to the lock file, then the changed part and the rest.
1101  *
1102  * - the config file is removed and the lock file rename()d to it.
1103  *
1104  */
1105 int git_config_set_multivar(const char *key, const char *value,
1106         const char *value_regex, int multi_replace)
1107 {
1108         int i, dot;
1109         int fd = -1, in_fd;
1110         int ret;
1111         char *config_filename;
1112         struct lock_file *lock = NULL;
1113         const char *last_dot = strrchr(key, '.');
1114
1115         if (config_exclusive_filename)
1116                 config_filename = xstrdup(config_exclusive_filename);
1117         else
1118                 config_filename = git_pathdup("config");
1119
1120         /*
1121          * Since "key" actually contains the section name and the real
1122          * key name separated by a dot, we have to know where the dot is.
1123          */
1124
1125         if (last_dot == NULL) {
1126                 error("key does not contain a section: %s", key);
1127                 ret = 2;
1128                 goto out_free;
1129         }
1130         store.baselen = last_dot - key;
1131
1132         store.multi_replace = multi_replace;
1133
1134         /*
1135          * Validate the key and while at it, lower case it for matching.
1136          */
1137         store.key = xmalloc(strlen(key) + 1);
1138         dot = 0;
1139         for (i = 0; key[i]; i++) {
1140                 unsigned char c = key[i];
1141                 if (c == '.')
1142                         dot = 1;
1143                 /* Leave the extended basename untouched.. */
1144                 if (!dot || i > store.baselen) {
1145                         if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
1146                                 error("invalid key: %s", key);
1147                                 free(store.key);
1148                                 ret = 1;
1149                                 goto out_free;
1150                         }
1151                         c = tolower(c);
1152                 } else if (c == '\n') {
1153                         error("invalid key (newline): %s", key);
1154                         free(store.key);
1155                         ret = 1;
1156                         goto out_free;
1157                 }
1158                 store.key[i] = c;
1159         }
1160         store.key[i] = 0;
1161
1162         /*
1163          * The lock serves a purpose in addition to locking: the new
1164          * contents of .git/config will be written into it.
1165          */
1166         lock = xcalloc(sizeof(struct lock_file), 1);
1167         fd = hold_lock_file_for_update(lock, config_filename, 0);
1168         if (fd < 0) {
1169                 error("could not lock config file %s: %s", config_filename, strerror(errno));
1170                 free(store.key);
1171                 ret = -1;
1172                 goto out_free;
1173         }
1174
1175         /*
1176          * If .git/config does not exist yet, write a minimal version.
1177          */
1178         in_fd = open(config_filename, O_RDONLY);
1179         if ( in_fd < 0 ) {
1180                 free(store.key);
1181
1182                 if ( ENOENT != errno ) {
1183                         error("opening %s: %s", config_filename,
1184                               strerror(errno));
1185                         ret = 3; /* same as "invalid config file" */
1186                         goto out_free;
1187                 }
1188                 /* if nothing to unset, error out */
1189                 if (value == NULL) {
1190                         ret = 5;
1191                         goto out_free;
1192                 }
1193
1194                 store.key = (char *)key;
1195                 if (!store_write_section(fd, key) ||
1196                     !store_write_pair(fd, key, value))
1197                         goto write_err_out;
1198         } else {
1199                 struct stat st;
1200                 char *contents;
1201                 size_t contents_sz, copy_begin, copy_end;
1202                 int i, new_line = 0;
1203
1204                 if (value_regex == NULL)
1205                         store.value_regex = NULL;
1206                 else {
1207                         if (value_regex[0] == '!') {
1208                                 store.do_not_match = 1;
1209                                 value_regex++;
1210                         } else
1211                                 store.do_not_match = 0;
1212
1213                         store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1214                         if (regcomp(store.value_regex, value_regex,
1215                                         REG_EXTENDED)) {
1216                                 error("invalid pattern: %s", value_regex);
1217                                 free(store.value_regex);
1218                                 ret = 6;
1219                                 goto out_free;
1220                         }
1221                 }
1222
1223                 store.offset[0] = 0;
1224                 store.state = START;
1225                 store.seen = 0;
1226
1227                 /*
1228                  * After this, store.offset will contain the *end* offset
1229                  * of the last match, or remain at 0 if no match was found.
1230                  * As a side effect, we make sure to transform only a valid
1231                  * existing config file.
1232                  */
1233                 if (git_config_from_file(store_aux, config_filename, NULL)) {
1234                         error("invalid config file %s", config_filename);
1235                         free(store.key);
1236                         if (store.value_regex != NULL) {
1237                                 regfree(store.value_regex);
1238                                 free(store.value_regex);
1239                         }
1240                         ret = 3;
1241                         goto out_free;
1242                 }
1243
1244                 free(store.key);
1245                 if (store.value_regex != NULL) {
1246                         regfree(store.value_regex);
1247                         free(store.value_regex);
1248                 }
1249
1250                 /* if nothing to unset, or too many matches, error out */
1251                 if ((store.seen == 0 && value == NULL) ||
1252                                 (store.seen > 1 && multi_replace == 0)) {
1253                         ret = 5;
1254                         goto out_free;
1255                 }
1256
1257                 fstat(in_fd, &st);
1258                 contents_sz = xsize_t(st.st_size);
1259                 contents = xmmap(NULL, contents_sz, PROT_READ,
1260                         MAP_PRIVATE, in_fd, 0);
1261                 close(in_fd);
1262
1263                 if (store.seen == 0)
1264                         store.seen = 1;
1265
1266                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1267                         if (store.offset[i] == 0) {
1268                                 store.offset[i] = copy_end = contents_sz;
1269                         } else if (store.state != KEY_SEEN) {
1270                                 copy_end = store.offset[i];
1271                         } else
1272                                 copy_end = find_beginning_of_line(
1273                                         contents, contents_sz,
1274                                         store.offset[i]-2, &new_line);
1275
1276                         if (copy_end > 0 && contents[copy_end-1] != '\n')
1277                                 new_line = 1;
1278
1279                         /* write the first part of the config */
1280                         if (copy_end > copy_begin) {
1281                                 if (write_in_full(fd, contents + copy_begin,
1282                                                   copy_end - copy_begin) <
1283                                     copy_end - copy_begin)
1284                                         goto write_err_out;
1285                                 if (new_line &&
1286                                     write_str_in_full(fd, "\n") != 1)
1287                                         goto write_err_out;
1288                         }
1289                         copy_begin = store.offset[i];
1290                 }
1291
1292                 /* write the pair (value == NULL means unset) */
1293                 if (value != NULL) {
1294                         if (store.state == START) {
1295                                 if (!store_write_section(fd, key))
1296                                         goto write_err_out;
1297                         }
1298                         if (!store_write_pair(fd, key, value))
1299                                 goto write_err_out;
1300                 }
1301
1302                 /* write the rest of the config */
1303                 if (copy_begin < contents_sz)
1304                         if (write_in_full(fd, contents + copy_begin,
1305                                           contents_sz - copy_begin) <
1306                             contents_sz - copy_begin)
1307                                 goto write_err_out;
1308
1309                 munmap(contents, contents_sz);
1310         }
1311
1312         if (commit_lock_file(lock) < 0) {
1313                 error("could not commit config file %s", config_filename);
1314                 ret = 4;
1315                 goto out_free;
1316         }
1317
1318         /*
1319          * lock is committed, so don't try to roll it back below.
1320          * NOTE: Since lockfile.c keeps a linked list of all created
1321          * lock_file structures, it isn't safe to free(lock).  It's
1322          * better to just leave it hanging around.
1323          */
1324         lock = NULL;
1325         ret = 0;
1326
1327 out_free:
1328         if (lock)
1329                 rollback_lock_file(lock);
1330         free(config_filename);
1331         return ret;
1332
1333 write_err_out:
1334         ret = write_error(lock->filename);
1335         goto out_free;
1336
1337 }
1338
1339 static int section_name_match (const char *buf, const char *name)
1340 {
1341         int i = 0, j = 0, dot = 0;
1342         if (buf[i] != '[')
1343                 return 0;
1344         for (i = 1; buf[i] && buf[i] != ']'; i++) {
1345                 if (!dot && isspace(buf[i])) {
1346                         dot = 1;
1347                         if (name[j++] != '.')
1348                                 break;
1349                         for (i++; isspace(buf[i]); i++)
1350                                 ; /* do nothing */
1351                         if (buf[i] != '"')
1352                                 break;
1353                         continue;
1354                 }
1355                 if (buf[i] == '\\' && dot)
1356                         i++;
1357                 else if (buf[i] == '"' && dot) {
1358                         for (i++; isspace(buf[i]); i++)
1359                                 ; /* do_nothing */
1360                         break;
1361                 }
1362                 if (buf[i] != name[j++])
1363                         break;
1364         }
1365         if (buf[i] == ']' && name[j] == 0) {
1366                 /*
1367                  * We match, now just find the right length offset by
1368                  * gobbling up any whitespace after it, as well
1369                  */
1370                 i++;
1371                 for (; buf[i] && isspace(buf[i]); i++)
1372                         ; /* do nothing */
1373                 return i;
1374         }
1375         return 0;
1376 }
1377
1378 /* if new_name == NULL, the section is removed instead */
1379 int git_config_rename_section(const char *old_name, const char *new_name)
1380 {
1381         int ret = 0, remove = 0;
1382         char *config_filename;
1383         struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1384         int out_fd;
1385         char buf[1024];
1386
1387         if (config_exclusive_filename)
1388                 config_filename = xstrdup(config_exclusive_filename);
1389         else
1390                 config_filename = git_pathdup("config");
1391         out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1392         if (out_fd < 0) {
1393                 ret = error("could not lock config file %s", config_filename);
1394                 goto out;
1395         }
1396
1397         if (!(config_file = fopen(config_filename, "rb"))) {
1398                 /* no config file means nothing to rename, no error */
1399                 goto unlock_and_out;
1400         }
1401
1402         while (fgets(buf, sizeof(buf), config_file)) {
1403                 int i;
1404                 int length;
1405                 char *output = buf;
1406                 for (i = 0; buf[i] && isspace(buf[i]); i++)
1407                         ; /* do nothing */
1408                 if (buf[i] == '[') {
1409                         /* it's a section */
1410                         int offset = section_name_match(&buf[i], old_name);
1411                         if (offset > 0) {
1412                                 ret++;
1413                                 if (new_name == NULL) {
1414                                         remove = 1;
1415                                         continue;
1416                                 }
1417                                 store.baselen = strlen(new_name);
1418                                 if (!store_write_section(out_fd, new_name)) {
1419                                         ret = write_error(lock->filename);
1420                                         goto out;
1421                                 }
1422                                 /*
1423                                  * We wrote out the new section, with
1424                                  * a newline, now skip the old
1425                                  * section's length
1426                                  */
1427                                 output += offset + i;
1428                                 if (strlen(output) > 0) {
1429                                         /*
1430                                          * More content means there's
1431                                          * a declaration to put on the
1432                                          * next line; indent with a
1433                                          * tab
1434                                          */
1435                                         output -= 1;
1436                                         output[0] = '\t';
1437                                 }
1438                         }
1439                         remove = 0;
1440                 }
1441                 if (remove)
1442                         continue;
1443                 length = strlen(output);
1444                 if (write_in_full(out_fd, output, length) != length) {
1445                         ret = write_error(lock->filename);
1446                         goto out;
1447                 }
1448         }
1449         fclose(config_file);
1450  unlock_and_out:
1451         if (commit_lock_file(lock) < 0)
1452                 ret = error("could not commit config file %s", config_filename);
1453  out:
1454         free(config_filename);
1455         return ret;
1456 }
1457
1458 /*
1459  * Call this to report error for your variable that should not
1460  * get a boolean value (i.e. "[my] var" means "true").
1461  */
1462 int config_error_nonbool(const char *var)
1463 {
1464         return error("Missing value for '%s'", var);
1465 }