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 static int git_config_maybe_bool_text(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_maybe_bool(const char *name, const char *value)
 431 {
 432         long v = git_config_maybe_bool_text(name, value);
 433         if (0 <= v)
 434                 return v;
 435         if (git_parse_long(value, &v))
 436                 return !!v;
 437         return -1;
 438 }
 439
 440 int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 441 {
 442         int v = git_config_maybe_bool_text(name, value);
 443         if (0 <= v) {
 444                 *is_bool = 1;
 445                 return v;
 446         }
 447         *is_bool = 0;
 448         return git_config_int(name, value);
 449 }
 450
 451 int git_config_bool(const char *name, const char *value)
 452 {
 453         int discard;
 454         return !!git_config_bool_or_int(name, value, &discard);
 455 }
 456
 457 int git_config_string(const char **dest, const char *var, const char *value)
 458 {
 459         if (!value)
 460                 return config_error_nonbool(var);
 461         *dest = xstrdup(value);
 462         return 0;
 463 }
 464
 465 int git_config_pathname(const char **dest, const char *var, const char *value)
 466 {
 467         if (!value)
 468                 return config_error_nonbool(var);
 469         *dest = expand_user_path(value);
 470         if (!*dest)
 471                 die("Failed to expand user dir in: '%s'", value);
 472         return 0;
 473 }
 474
 475 static int git_default_core_config(const char *var, const char *value)
 476 {
 477         /* This needs a better name */
 478         if (!strcmp(var, "core.filemode")) {
 479                 trust_executable_bit = git_config_bool(var, value);
 480                 return 0;
 481         }
 482         if (!strcmp(var, "core.trustctime")) {
 483                 trust_ctime = git_config_bool(var, value);
 484                 return 0;
 485         }
 486
 487         if (!strcmp(var, "core.quotepath")) {
 488                 quote_path_fully = git_config_bool(var, value);
 489                 return 0;
 490         }
 491
 492         if (!strcmp(var, "core.symlinks")) {
 493                 has_symlinks = git_config_bool(var, value);
 494                 return 0;
 495         }
 496
 497         if (!strcmp(var, "core.ignorecase")) {
 498                 ignore_case = git_config_bool(var, value);
 499                 return 0;
 500         }
 501
 502         if (!strcmp(var, "core.bare")) {
 503                 is_bare_repository_cfg = git_config_bool(var, value);
 504                 return 0;
 505         }
 506
 507         if (!strcmp(var, "core.ignorestat")) {
 508                 assume_unchanged = git_config_bool(var, value);
 509                 return 0;
 510         }
 511
 512         if (!strcmp(var, "core.prefersymlinkrefs")) {
 513                 prefer_symlink_refs = git_config_bool(var, value);
 514                 return 0;
 515         }
 516
 517         if (!strcmp(var, "core.logallrefupdates")) {
 518                 log_all_ref_updates = git_config_bool(var, value);
 519                 return 0;
 520         }
 521
 522         if (!strcmp(var, "core.warnambiguousrefs")) {
 523                 warn_ambiguous_refs = git_config_bool(var, value);
 524                 return 0;
 525         }
 526
 527         if (!strcmp(var, "core.loosecompression")) {
 528                 int level = git_config_int(var, value);
 529                 if (level == -1)
 530                         level = Z_DEFAULT_COMPRESSION;
 531                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 532                         die("bad zlib compression level %d", level);
 533                 zlib_compression_level = level;
 534                 zlib_compression_seen = 1;
 535                 return 0;
 536         }
 537
 538         if (!strcmp(var, "core.compression")) {
 539                 int level = git_config_int(var, value);
 540                 if (level == -1)
 541                         level = Z_DEFAULT_COMPRESSION;
 542                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 543                         die("bad zlib compression level %d", level);
 544                 core_compression_level = level;
 545                 core_compression_seen = 1;
 546                 if (!zlib_compression_seen)
 547                         zlib_compression_level = level;
 548                 return 0;
 549         }
 550
 551         if (!strcmp(var, "core.packedgitwindowsize")) {
 552                 int pgsz_x2 = getpagesize() * 2;
 553                 packed_git_window_size = git_config_int(var, value);
 554
 555                 /* This value must be multiple of (pagesize * 2) */
 556                 packed_git_window_size /= pgsz_x2;
 557                 if (packed_git_window_size < 1)
 558                         packed_git_window_size = 1;
 559                 packed_git_window_size *= pgsz_x2;
 560                 return 0;
 561         }
 562
 563         if (!strcmp(var, "core.packedgitlimit")) {
 564                 packed_git_limit = git_config_int(var, value);
 565                 return 0;
 566         }
 567
 568         if (!strcmp(var, "core.deltabasecachelimit")) {
 569                 delta_base_cache_limit = git_config_int(var, value);
 570                 return 0;
 571         }
 572
 573         if (!strcmp(var, "core.autocrlf")) {
 574                 if (value && !strcasecmp(value, "input")) {
 575                         if (eol == EOL_CRLF)
 576                                 return error("core.autocrlf=input conflicts with core.eol=crlf");
 577                         auto_crlf = AUTO_CRLF_INPUT;
 578                         return 0;
 579                 }
 580                 auto_crlf = git_config_bool(var, value);
 581                 return 0;
 582         }
 583
 584         if (!strcmp(var, "core.safecrlf")) {
 585                 if (value && !strcasecmp(value, "warn")) {
 586                         safe_crlf = SAFE_CRLF_WARN;
 587                         return 0;
 588                 }
 589                 safe_crlf = git_config_bool(var, value);
 590                 return 0;
 591         }
 592
 593         if (!strcmp(var, "core.eol")) {
 594                 if (value && !strcasecmp(value, "lf"))
 595                         eol = EOL_LF;
 596                 else if (value && !strcasecmp(value, "crlf"))
 597                         eol = EOL_CRLF;
 598                 else if (value && !strcasecmp(value, "native"))
 599                         eol = EOL_NATIVE;
 600                 else
 601                         eol = EOL_UNSET;
 602                 if (eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 603                         return error("core.autocrlf=input conflicts with core.eol=crlf");
 604                 return 0;
 605         }
 606
 607         if (!strcmp(var, "core.notesref")) {
 608                 notes_ref_name = xstrdup(value);
 609                 return 0;
 610         }
 611
 612         if (!strcmp(var, "core.pager"))
 613                 return git_config_string(&pager_program, var, value);
 614
 615         if (!strcmp(var, "core.editor"))
 616                 return git_config_string(&editor_program, var, value);
 617
 618         if (!strcmp(var, "core.askpass"))
 619                 return git_config_string(&askpass_program, var, value);
 620
 621         if (!strcmp(var, "core.excludesfile"))
 622                 return git_config_pathname(&excludes_file, var, value);
 623
 624         if (!strcmp(var, "core.whitespace")) {
 625                 if (!value)
 626                         return config_error_nonbool(var);
 627                 whitespace_rule_cfg = parse_whitespace_rule(value);
 628                 return 0;
 629         }
 630
 631         if (!strcmp(var, "core.fsyncobjectfiles")) {
 632                 fsync_object_files = git_config_bool(var, value);
 633                 return 0;
 634         }
 635
 636         if (!strcmp(var, "core.preloadindex")) {
 637                 core_preload_index = git_config_bool(var, value);
 638                 return 0;
 639         }
 640
 641         if (!strcmp(var, "core.createobject")) {
 642                 if (!strcmp(value, "rename"))
 643                         object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 644                 else if (!strcmp(value, "link"))
 645                         object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 646                 else
 647                         die("Invalid mode for object creation: %s", value);
 648                 return 0;
 649         }
 650
 651         if (!strcmp(var, "core.sparsecheckout")) {
 652                 core_apply_sparse_checkout = git_config_bool(var, value);
 653                 return 0;
 654         }
 655
 656         /* Add other config variables here and to Documentation/config.txt. */
 657         return 0;
 658 }
 659
 660 static int git_default_user_config(const char *var, const char *value)
 661 {
 662         if (!strcmp(var, "user.name")) {
 663                 if (!value)
 664                         return config_error_nonbool(var);
 665                 strlcpy(git_default_name, value, sizeof(git_default_name));
 666                 user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 667                 return 0;
 668         }
 669
 670         if (!strcmp(var, "user.email")) {
 671                 if (!value)
 672                         return config_error_nonbool(var);
 673                 strlcpy(git_default_email, value, sizeof(git_default_email));
 674                 user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 675                 return 0;
 676         }
 677
 678         /* Add other config variables here and to Documentation/config.txt. */
 679         return 0;
 680 }
 681
 682 static int git_default_i18n_config(const char *var, const char *value)
 683 {
 684         if (!strcmp(var, "i18n.commitencoding"))
 685                 return git_config_string(&git_commit_encoding, var, value);
 686
 687         if (!strcmp(var, "i18n.logoutputencoding"))
 688                 return git_config_string(&git_log_output_encoding, var, value);
 689
 690         /* Add other config variables here and to Documentation/config.txt. */
 691         return 0;
 692 }
 693
 694 static int git_default_branch_config(const char *var, const char *value)
 695 {
 696         if (!strcmp(var, "branch.autosetupmerge")) {
 697                 if (value && !strcasecmp(value, "always")) {
 698                         git_branch_track = BRANCH_TRACK_ALWAYS;
 699                         return 0;
 700                 }
 701                 git_branch_track = git_config_bool(var, value);
 702                 return 0;
 703         }
 704         if (!strcmp(var, "branch.autosetuprebase")) {
 705                 if (!value)
 706                         return config_error_nonbool(var);
 707                 else if (!strcmp(value, "never"))
 708                         autorebase = AUTOREBASE_NEVER;
 709                 else if (!strcmp(value, "local"))
 710                         autorebase = AUTOREBASE_LOCAL;
 711                 else if (!strcmp(value, "remote"))
 712                         autorebase = AUTOREBASE_REMOTE;
 713                 else if (!strcmp(value, "always"))
 714                         autorebase = AUTOREBASE_ALWAYS;
 715                 else
 716                         return error("Malformed value for %s", var);
 717                 return 0;
 718         }
 719
 720         /* Add other config variables here and to Documentation/config.txt. */
 721         return 0;
 722 }
 723
 724 static int git_default_push_config(const char *var, const char *value)
 725 {
 726         if (!strcmp(var, "push.default")) {
 727                 if (!value)
 728                         return config_error_nonbool(var);
 729                 else if (!strcmp(value, "nothing"))
 730                         push_default = PUSH_DEFAULT_NOTHING;
 731                 else if (!strcmp(value, "matching"))
 732                         push_default = PUSH_DEFAULT_MATCHING;
 733                 else if (!strcmp(value, "tracking"))
 734                         push_default = PUSH_DEFAULT_TRACKING;
 735                 else if (!strcmp(value, "current"))
 736                         push_default = PUSH_DEFAULT_CURRENT;
 737                 else {
 738                         error("Malformed value for %s: %s", var, value);
 739                         return error("Must be one of nothing, matching, "
 740                                      "tracking or current.");
 741                 }
 742                 return 0;
 743         }
 744
 745         /* Add other config variables here and to Documentation/config.txt. */
 746         return 0;
 747 }
 748
 749 static int git_default_mailmap_config(const char *var, const char *value)
 750 {
 751         if (!strcmp(var, "mailmap.file"))
 752                 return git_config_string(&git_mailmap_file, var, value);
 753
 754         /* Add other config variables here and to Documentation/config.txt. */
 755         return 0;
 756 }
 757
 758 int git_default_config(const char *var, const char *value, void *dummy)
 759 {
 760         if (!prefixcmp(var, "core."))
 761                 return git_default_core_config(var, value);
 762
 763         if (!prefixcmp(var, "user."))
 764                 return git_default_user_config(var, value);
 765
 766         if (!prefixcmp(var, "i18n."))
 767                 return git_default_i18n_config(var, value);
 768
 769         if (!prefixcmp(var, "branch."))
 770                 return git_default_branch_config(var, value);
 771
 772         if (!prefixcmp(var, "push."))
 773                 return git_default_push_config(var, value);
 774
 775         if (!prefixcmp(var, "mailmap."))
 776                 return git_default_mailmap_config(var, value);
 777
 778         if (!prefixcmp(var, "advice."))
 779                 return git_default_advice_config(var, value);
 780
 781         if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 782                 pager_use_color = git_config_bool(var,value);
 783                 return 0;
 784         }
 785
 786         /* Add other config variables here and to Documentation/config.txt. */
 787         return 0;
 788 }
 789
 790 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 791 {
 792         int ret;
 793         FILE *f = fopen(filename, "r");
 794
 795         ret = -1;
 796         if (f) {
 797                 config_file = f;
 798                 config_file_name = filename;
 799                 config_linenr = 1;
 800                 config_file_eof = 0;
 801                 ret = git_parse_file(fn, data);
 802                 fclose(f);
 803                 config_file_name = NULL;
 804         }
 805         return ret;
 806 }
 807
 808 const char *git_etc_gitconfig(void)
 809 {
 810         static const char *system_wide;
 811         if (!system_wide)
 812                 system_wide = system_path(ETC_GITCONFIG);
 813         return system_wide;
 814 }
 815
 816 int git_env_bool(const char *k, int def)
 817 {
 818         const char *v = getenv(k);
 819         return v ? git_config_bool(k, v) : def;
 820 }
 821
 822 int git_config_system(void)
 823 {
 824         return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 825 }
 826
 827 int git_config_global(void)
 828 {
 829         return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
 830 }
 831
 832 int git_config_from_parameters(config_fn_t fn, void *data)
 833 {
 834         static int loaded_environment;
 835         const struct config_item *ct;
 836
 837         if (!loaded_environment) {
 838                 if (git_config_parse_environment() < 0)
 839                         return -1;
 840                 loaded_environment = 1;
 841         }
 842         for (ct = config_parameters; ct; ct = ct->next)
 843                 if (fn(ct->name, ct->value, data) < 0)
 844                         return -1;
 845         return 0;
 846 }
 847
 848 int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 849 {
 850         int ret = 0, found = 0;
 851         const char *home = NULL;
 852
 853         /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
 854         if (config_exclusive_filename)
 855                 return git_config_from_file(fn, config_exclusive_filename, data);
 856         if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 857                 ret += git_config_from_file(fn, git_etc_gitconfig(),
 858                                             data);
 859                 found += 1;
 860         }
 861
 862         home = getenv("HOME");
 863         if (git_config_global() && home) {
 864                 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
 865                 if (!access(user_config, R_OK)) {
 866                         ret += git_config_from_file(fn, user_config, data);
 867                         found += 1;
 868                 }
 869                 free(user_config);
 870         }
 871
 872         if (repo_config && !access(repo_config, R_OK)) {
 873                 ret += git_config_from_file(fn, repo_config, data);
 874                 found += 1;
 875         }
 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 int git_config(config_fn_t fn, void *data)
 885 {
 886         char *repo_config = NULL;
 887         int ret;
 888
 889         repo_config = git_pathdup("config");
 890         ret = git_config_early(fn, data, repo_config);
 891         if (repo_config)
 892                 free(repo_config);
 893         return ret;
 894 }
 895
 896 /*
 897  * Find all the stuff for git_config_set() below.
 898  */
 899
 900 #define MAX_MATCHES 512
 901
 902 static struct {
 903         int baselen;
 904         char *key;
 905         int do_not_match;
 906         regex_t *value_regex;
 907         int multi_replace;
 908         size_t offset[MAX_MATCHES];
 909         enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 910         int seen;
 911 } store;
 912
 913 static int matches(const char *key, const char *value)
 914 {
 915         return !strcmp(key, store.key) &&
 916                 (store.value_regex == NULL ||
 917                  (store.do_not_match ^
 918                   !regexec(store.value_regex, value, 0, NULL, 0)));
 919 }
 920
 921 static int store_aux(const char *key, const char *value, void *cb)
 922 {
 923         const char *ep;
 924         size_t section_len;
 925
 926         switch (store.state) {
 927         case KEY_SEEN:
 928                 if (matches(key, value)) {
 929                         if (store.seen == 1 && store.multi_replace == 0) {
 930                                 warning("%s has multiple values", key);
 931                         } else if (store.seen >= MAX_MATCHES) {
 932                                 error("too many matches for %s", key);
 933                                 return 1;
 934                         }
 935
 936                         store.offset[store.seen] = ftell(config_file);
 937                         store.seen++;
 938                 }
 939                 break;
 940         case SECTION_SEEN:
 941                 /*
 942                  * What we are looking for is in store.key (both
 943                  * section and var), and its section part is baselen
 944                  * long.  We found key (again, both section and var).
 945                  * We would want to know if this key is in the same
 946                  * section as what we are looking for.  We already
 947                  * know we are in the same section as what should
 948                  * hold store.key.
 949                  */
 950                 ep = strrchr(key, '.');
 951                 section_len = ep - key;
 952
 953                 if ((section_len != store.baselen) ||
 954                     memcmp(key, store.key, section_len+1)) {
 955                         store.state = SECTION_END_SEEN;
 956                         break;
 957                 }
 958
 959                 /*
 960                  * Do not increment matches: this is no match, but we
 961                  * just made sure we are in the desired section.
 962                  */
 963                 store.offset[store.seen] = ftell(config_file);
 964                 /* fallthru */
 965         case SECTION_END_SEEN:
 966         case START:
 967                 if (matches(key, value)) {
 968                         store.offset[store.seen] = ftell(config_file);
 969                         store.state = KEY_SEEN;
 970                         store.seen++;
 971                 } else {
 972                         if (strrchr(key, '.') - key == store.baselen &&
 973                               !strncmp(key, store.key, store.baselen)) {
 974                                         store.state = SECTION_SEEN;
 975                                         store.offset[store.seen] = ftell(config_file);
 976                         }
 977                 }
 978         }
 979         return 0;
 980 }
 981
 982 static int write_error(const char *filename)
 983 {
 984         error("failed to write new configuration file %s", filename);
 985
 986         /* Same error code as "failed to rename". */
 987         return 4;
 988 }
 989
 990 static int store_write_section(int fd, const char *key)
 991 {
 992         const char *dot;
 993         int i, success;
 994         struct strbuf sb = STRBUF_INIT;
 995
 996         dot = memchr(key, '.', store.baselen);
 997         if (dot) {
 998                 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
 999                 for (i = dot - key + 1; i < store.baselen; i++) {
1000                         if (key[i] == '"' || key[i] == '\\')
1001                                 strbuf_addch(&sb, '\\');
1002                         strbuf_addch(&sb, key[i]);
1003                 }
1004                 strbuf_addstr(&sb, "\"]\n");
1005         } else {
1006                 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1007         }
1008
1009         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1010         strbuf_release(&sb);
1011
1012         return success;
1013 }
1014
1015 static int store_write_pair(int fd, const char *key, const char *value)
1016 {
1017         int i, success;
1018         int length = strlen(key + store.baselen + 1);
1019         const char *quote = "";
1020         struct strbuf sb = STRBUF_INIT;
1021
1022         /*
1023          * Check to see if the value needs to be surrounded with a dq pair.
1024          * Note that problematic characters are always backslash-quoted; this
1025          * check is about not losing leading or trailing SP and strings that
1026          * follow beginning-of-comment characters (i.e. ';' and '#') by the
1027          * configuration parser.
1028          */
1029         if (value[0] == ' ')
1030                 quote = "\"";
1031         for (i = 0; value[i]; i++)
1032                 if (value[i] == ';' || value[i] == '#')
1033                         quote = "\"";
1034         if (i && value[i - 1] == ' ')
1035                 quote = "\"";
1036
1037         strbuf_addf(&sb, "\t%.*s = %s",
1038                     length, key + store.baselen + 1, quote);
1039
1040         for (i = 0; value[i]; i++)
1041                 switch (value[i]) {
1042                 case '\n':
1043                         strbuf_addstr(&sb, "\\n");
1044                         break;
1045                 case '\t':
1046                         strbuf_addstr(&sb, "\\t");
1047                         break;
1048                 case '"':
1049                 case '\\':
1050                         strbuf_addch(&sb, '\\');
1051                 default:
1052                         strbuf_addch(&sb, value[i]);
1053                         break;
1054                 }
1055         strbuf_addf(&sb, "%s\n", quote);
1056
1057         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1058         strbuf_release(&sb);
1059
1060         return success;
1061 }
1062
1063 static ssize_t find_beginning_of_line(const char *contents, size_t size,
1064         size_t offset_, int *found_bracket)
1065 {
1066         size_t equal_offset = size, bracket_offset = size;
1067         ssize_t offset;
1068
1069 contline:
1070         for (offset = offset_-2; offset > 0
1071                         && contents[offset] != '\n'; offset--)
1072                 switch (contents[offset]) {
1073                         case '=': equal_offset = offset; break;
1074                         case ']': bracket_offset = offset; break;
1075                 }
1076         if (offset > 0 && contents[offset-1] == '\\') {
1077                 offset_ = offset;
1078                 goto contline;
1079         }
1080         if (bracket_offset < equal_offset) {
1081                 *found_bracket = 1;
1082                 offset = bracket_offset+1;
1083         } else
1084                 offset++;
1085
1086         return offset;
1087 }
1088
1089 int git_config_set(const char *key, const char *value)
1090 {
1091         return git_config_set_multivar(key, value, NULL, 0);
1092 }
1093
1094 /*
1095  * If value==NULL, unset in (remove from) config,
1096  * if value_regex!=NULL, disregard key/value pairs where value does not match.
1097  * if multi_replace==0, nothing, or only one matching key/value is replaced,
1098  *     else all matching key/values (regardless how many) are removed,
1099  *     before the new pair is written.
1100  *
1101  * Returns 0 on success.
1102  *
1103  * This function does this:
1104  *
1105  * - it locks the config file by creating ".git/config.lock"
1106  *
1107  * - it then parses the config using store_aux() as validator to find
1108  *   the position on the key/value pair to replace. If it is to be unset,
1109  *   it must be found exactly once.
1110  *
1111  * - the config file is mmap()ed and the part before the match (if any) is
1112  *   written to the lock file, then the changed part and the rest.
1113  *
1114  * - the config file is removed and the lock file rename()d to it.
1115  *
1116  */
1117 int git_config_set_multivar(const char *key, const char *value,
1118         const char *value_regex, int multi_replace)
1119 {
1120         int i, dot;
1121         int fd = -1, in_fd;
1122         int ret;
1123         char *config_filename;
1124         struct lock_file *lock = NULL;
1125         const char *last_dot = strrchr(key, '.');
1126
1127         if (config_exclusive_filename)
1128                 config_filename = xstrdup(config_exclusive_filename);
1129         else
1130                 config_filename = git_pathdup("config");
1131
1132         /*
1133          * Since "key" actually contains the section name and the real
1134          * key name separated by a dot, we have to know where the dot is.
1135          */
1136
1137         if (last_dot == NULL) {
1138                 error("key does not contain a section: %s", key);
1139                 ret = 2;
1140                 goto out_free;
1141         }
1142         store.baselen = last_dot - key;
1143
1144         store.multi_replace = multi_replace;
1145
1146         /*
1147          * Validate the key and while at it, lower case it for matching.
1148          */
1149         store.key = xmalloc(strlen(key) + 1);
1150         dot = 0;
1151         for (i = 0; key[i]; i++) {
1152                 unsigned char c = key[i];
1153                 if (c == '.')
1154                         dot = 1;
1155                 /* Leave the extended basename untouched.. */
1156                 if (!dot || i > store.baselen) {
1157                         if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
1158                                 error("invalid key: %s", key);
1159                                 free(store.key);
1160                                 ret = 1;
1161                                 goto out_free;
1162                         }
1163                         c = tolower(c);
1164                 } else if (c == '\n') {
1165                         error("invalid key (newline): %s", key);
1166                         free(store.key);
1167                         ret = 1;
1168                         goto out_free;
1169                 }
1170                 store.key[i] = c;
1171         }
1172         store.key[i] = 0;
1173
1174         /*
1175          * The lock serves a purpose in addition to locking: the new
1176          * contents of .git/config will be written into it.
1177          */
1178         lock = xcalloc(sizeof(struct lock_file), 1);
1179         fd = hold_lock_file_for_update(lock, config_filename, 0);
1180         if (fd < 0) {
1181                 error("could not lock config file %s: %s", config_filename, strerror(errno));
1182                 free(store.key);
1183                 ret = -1;
1184                 goto out_free;
1185         }
1186
1187         /*
1188          * If .git/config does not exist yet, write a minimal version.
1189          */
1190         in_fd = open(config_filename, O_RDONLY);
1191         if ( in_fd < 0 ) {
1192                 free(store.key);
1193
1194                 if ( ENOENT != errno ) {
1195                         error("opening %s: %s", config_filename,
1196                               strerror(errno));
1197                         ret = 3; /* same as "invalid config file" */
1198                         goto out_free;
1199                 }
1200                 /* if nothing to unset, error out */
1201                 if (value == NULL) {
1202                         ret = 5;
1203                         goto out_free;
1204                 }
1205
1206                 store.key = (char *)key;
1207                 if (!store_write_section(fd, key) ||
1208                     !store_write_pair(fd, key, value))
1209                         goto write_err_out;
1210         } else {
1211                 struct stat st;
1212                 char *contents;
1213                 size_t contents_sz, copy_begin, copy_end;
1214                 int i, new_line = 0;
1215
1216                 if (value_regex == NULL)
1217                         store.value_regex = NULL;
1218                 else {
1219                         if (value_regex[0] == '!') {
1220                                 store.do_not_match = 1;
1221                                 value_regex++;
1222                         } else
1223                                 store.do_not_match = 0;
1224
1225                         store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1226                         if (regcomp(store.value_regex, value_regex,
1227                                         REG_EXTENDED)) {
1228                                 error("invalid pattern: %s", value_regex);
1229                                 free(store.value_regex);
1230                                 ret = 6;
1231                                 goto out_free;
1232                         }
1233                 }
1234
1235                 store.offset[0] = 0;
1236                 store.state = START;
1237                 store.seen = 0;
1238
1239                 /*
1240                  * After this, store.offset will contain the *end* offset
1241                  * of the last match, or remain at 0 if no match was found.
1242                  * As a side effect, we make sure to transform only a valid
1243                  * existing config file.
1244                  */
1245                 if (git_config_from_file(store_aux, config_filename, NULL)) {
1246                         error("invalid config file %s", config_filename);
1247                         free(store.key);
1248                         if (store.value_regex != NULL) {
1249                                 regfree(store.value_regex);
1250                                 free(store.value_regex);
1251                         }
1252                         ret = 3;
1253                         goto out_free;
1254                 }
1255
1256                 free(store.key);
1257                 if (store.value_regex != NULL) {
1258                         regfree(store.value_regex);
1259                         free(store.value_regex);
1260                 }
1261
1262                 /* if nothing to unset, or too many matches, error out */
1263                 if ((store.seen == 0 && value == NULL) ||
1264                                 (store.seen > 1 && multi_replace == 0)) {
1265                         ret = 5;
1266                         goto out_free;
1267                 }
1268
1269                 fstat(in_fd, &st);
1270                 contents_sz = xsize_t(st.st_size);
1271                 contents = xmmap(NULL, contents_sz, PROT_READ,
1272                         MAP_PRIVATE, in_fd, 0);
1273                 close(in_fd);
1274
1275                 if (store.seen == 0)
1276                         store.seen = 1;
1277
1278                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1279                         if (store.offset[i] == 0) {
1280                                 store.offset[i] = copy_end = contents_sz;
1281                         } else if (store.state != KEY_SEEN) {
1282                                 copy_end = store.offset[i];
1283                         } else
1284                                 copy_end = find_beginning_of_line(
1285                                         contents, contents_sz,
1286                                         store.offset[i]-2, &new_line);
1287
1288                         if (copy_end > 0 && contents[copy_end-1] != '\n')
1289                                 new_line = 1;
1290
1291                         /* write the first part of the config */
1292                         if (copy_end > copy_begin) {
1293                                 if (write_in_full(fd, contents + copy_begin,
1294                                                   copy_end - copy_begin) <
1295                                     copy_end - copy_begin)
1296                                         goto write_err_out;
1297                                 if (new_line &&
1298                                     write_str_in_full(fd, "\n") != 1)
1299                                         goto write_err_out;
1300                         }
1301                         copy_begin = store.offset[i];
1302                 }
1303
1304                 /* write the pair (value == NULL means unset) */
1305                 if (value != NULL) {
1306                         if (store.state == START) {
1307                                 if (!store_write_section(fd, key))
1308                                         goto write_err_out;
1309                         }
1310                         if (!store_write_pair(fd, key, value))
1311                                 goto write_err_out;
1312                 }
1313
1314                 /* write the rest of the config */
1315                 if (copy_begin < contents_sz)
1316                         if (write_in_full(fd, contents + copy_begin,
1317                                           contents_sz - copy_begin) <
1318                             contents_sz - copy_begin)
1319                                 goto write_err_out;
1320
1321                 munmap(contents, contents_sz);
1322         }
1323
1324         if (commit_lock_file(lock) < 0) {
1325                 error("could not commit config file %s", config_filename);
1326                 ret = 4;
1327                 goto out_free;
1328         }
1329
1330         /*
1331          * lock is committed, so don't try to roll it back below.
1332          * NOTE: Since lockfile.c keeps a linked list of all created
1333          * lock_file structures, it isn't safe to free(lock).  It's
1334          * better to just leave it hanging around.
1335          */
1336         lock = NULL;
1337         ret = 0;
1338
1339 out_free:
1340         if (lock)
1341                 rollback_lock_file(lock);
1342         free(config_filename);
1343         return ret;
1344
1345 write_err_out:
1346         ret = write_error(lock->filename);
1347         goto out_free;
1348
1349 }
1350
1351 static int section_name_match (const char *buf, const char *name)
1352 {
1353         int i = 0, j = 0, dot = 0;
1354         if (buf[i] != '[')
1355                 return 0;
1356         for (i = 1; buf[i] && buf[i] != ']'; i++) {
1357                 if (!dot && isspace(buf[i])) {
1358                         dot = 1;
1359                         if (name[j++] != '.')
1360                                 break;
1361                         for (i++; isspace(buf[i]); i++)
1362                                 ; /* do nothing */
1363                         if (buf[i] != '"')
1364                                 break;
1365                         continue;
1366                 }
1367                 if (buf[i] == '\\' && dot)
1368                         i++;
1369                 else if (buf[i] == '"' && dot) {
1370                         for (i++; isspace(buf[i]); i++)
1371                                 ; /* do_nothing */
1372                         break;
1373                 }
1374                 if (buf[i] != name[j++])
1375                         break;
1376         }
1377         if (buf[i] == ']' && name[j] == 0) {
1378                 /*
1379                  * We match, now just find the right length offset by
1380                  * gobbling up any whitespace after it, as well
1381                  */
1382                 i++;
1383                 for (; buf[i] && isspace(buf[i]); i++)
1384                         ; /* do nothing */
1385                 return i;
1386         }
1387         return 0;
1388 }
1389
1390 /* if new_name == NULL, the section is removed instead */
1391 int git_config_rename_section(const char *old_name, const char *new_name)
1392 {
1393         int ret = 0, remove = 0;
1394         char *config_filename;
1395         struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1396         int out_fd;
1397         char buf[1024];
1398
1399         if (config_exclusive_filename)
1400                 config_filename = xstrdup(config_exclusive_filename);
1401         else
1402                 config_filename = git_pathdup("config");
1403         out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1404         if (out_fd < 0) {
1405                 ret = error("could not lock config file %s", config_filename);
1406                 goto out;
1407         }
1408
1409         if (!(config_file = fopen(config_filename, "rb"))) {
1410                 /* no config file means nothing to rename, no error */
1411                 goto unlock_and_out;
1412         }
1413
1414         while (fgets(buf, sizeof(buf), config_file)) {
1415                 int i;
1416                 int length;
1417                 char *output = buf;
1418                 for (i = 0; buf[i] && isspace(buf[i]); i++)
1419                         ; /* do nothing */
1420                 if (buf[i] == '[') {
1421                         /* it's a section */
1422                         int offset = section_name_match(&buf[i], old_name);
1423                         if (offset > 0) {
1424                                 ret++;
1425                                 if (new_name == NULL) {
1426                                         remove = 1;
1427                                         continue;
1428                                 }
1429                                 store.baselen = strlen(new_name);
1430                                 if (!store_write_section(out_fd, new_name)) {
1431                                         ret = write_error(lock->filename);
1432                                         goto out;
1433                                 }
1434                                 /*
1435                                  * We wrote out the new section, with
1436                                  * a newline, now skip the old
1437                                  * section's length
1438                                  */
1439                                 output += offset + i;
1440                                 if (strlen(output) > 0) {
1441                                         /*
1442                                          * More content means there's
1443                                          * a declaration to put on the
1444                                          * next line; indent with a
1445                                          * tab
1446                                          */
1447                                         output -= 1;
1448                                         output[0] = '\t';
1449                                 }
1450                         }
1451                         remove = 0;
1452                 }
1453                 if (remove)
1454                         continue;
1455                 length = strlen(output);
1456                 if (write_in_full(out_fd, output, length) != length) {
1457                         ret = write_error(lock->filename);
1458                         goto out;
1459                 }
1460         }
1461         fclose(config_file);
1462  unlock_and_out:
1463         if (commit_lock_file(lock) < 0)
1464                 ret = error("could not commit config file %s", config_filename);
1465  out:
1466         free(config_filename);
1467         return ret;
1468 }
1469
1470 /*
1471  * Call this to report error for your variable that should not
1472  * get a boolean value (i.e. "[my] var" means "true").
1473  */
1474 int config_error_nonbool(const char *var)
1475 {
1476         return error("Missing value for '%s'", var);
1477 }