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.abbrevguard")) {
 503                 unique_abbrev_extra_length = git_config_int(var, value);
 504                 if (unique_abbrev_extra_length < 0)
 505                         unique_abbrev_extra_length = 0;
 506                 return 0;
 507         }
 508
 509         if (!strcmp(var, "core.bare")) {
 510                 is_bare_repository_cfg = git_config_bool(var, value);
 511                 return 0;
 512         }
 513
 514         if (!strcmp(var, "core.ignorestat")) {
 515                 assume_unchanged = git_config_bool(var, value);
 516                 return 0;
 517         }
 518
 519         if (!strcmp(var, "core.prefersymlinkrefs")) {
 520                 prefer_symlink_refs = git_config_bool(var, value);
 521                 return 0;
 522         }
 523
 524         if (!strcmp(var, "core.logallrefupdates")) {
 525                 log_all_ref_updates = git_config_bool(var, value);
 526                 return 0;
 527         }
 528
 529         if (!strcmp(var, "core.warnambiguousrefs")) {
 530                 warn_ambiguous_refs = git_config_bool(var, value);
 531                 return 0;
 532         }
 533
 534         if (!strcmp(var, "core.loosecompression")) {
 535                 int level = git_config_int(var, value);
 536                 if (level == -1)
 537                         level = Z_DEFAULT_COMPRESSION;
 538                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 539                         die("bad zlib compression level %d", level);
 540                 zlib_compression_level = level;
 541                 zlib_compression_seen = 1;
 542                 return 0;
 543         }
 544
 545         if (!strcmp(var, "core.compression")) {
 546                 int level = git_config_int(var, value);
 547                 if (level == -1)
 548                         level = Z_DEFAULT_COMPRESSION;
 549                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 550                         die("bad zlib compression level %d", level);
 551                 core_compression_level = level;
 552                 core_compression_seen = 1;
 553                 if (!zlib_compression_seen)
 554                         zlib_compression_level = level;
 555                 return 0;
 556         }
 557
 558         if (!strcmp(var, "core.packedgitwindowsize")) {
 559                 int pgsz_x2 = getpagesize() * 2;
 560                 packed_git_window_size = git_config_int(var, value);
 561
 562                 /* This value must be multiple of (pagesize * 2) */
 563                 packed_git_window_size /= pgsz_x2;
 564                 if (packed_git_window_size < 1)
 565                         packed_git_window_size = 1;
 566                 packed_git_window_size *= pgsz_x2;
 567                 return 0;
 568         }
 569
 570         if (!strcmp(var, "core.packedgitlimit")) {
 571                 packed_git_limit = git_config_int(var, value);
 572                 return 0;
 573         }
 574
 575         if (!strcmp(var, "core.deltabasecachelimit")) {
 576                 delta_base_cache_limit = git_config_int(var, value);
 577                 return 0;
 578         }
 579
 580         if (!strcmp(var, "core.autocrlf")) {
 581                 if (value && !strcasecmp(value, "input")) {
 582                         if (eol == EOL_CRLF)
 583                                 return error("core.autocrlf=input conflicts with core.eol=crlf");
 584                         auto_crlf = AUTO_CRLF_INPUT;
 585                         return 0;
 586                 }
 587                 auto_crlf = git_config_bool(var, value);
 588                 return 0;
 589         }
 590
 591         if (!strcmp(var, "core.safecrlf")) {
 592                 if (value && !strcasecmp(value, "warn")) {
 593                         safe_crlf = SAFE_CRLF_WARN;
 594                         return 0;
 595                 }
 596                 safe_crlf = git_config_bool(var, value);
 597                 return 0;
 598         }
 599
 600         if (!strcmp(var, "core.eol")) {
 601                 if (value && !strcasecmp(value, "lf"))
 602                         eol = EOL_LF;
 603                 else if (value && !strcasecmp(value, "crlf"))
 604                         eol = EOL_CRLF;
 605                 else if (value && !strcasecmp(value, "native"))
 606                         eol = EOL_NATIVE;
 607                 else
 608                         eol = EOL_UNSET;
 609                 if (eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 610                         return error("core.autocrlf=input conflicts with core.eol=crlf");
 611                 return 0;
 612         }
 613
 614         if (!strcmp(var, "core.notesref")) {
 615                 notes_ref_name = xstrdup(value);
 616                 return 0;
 617         }
 618
 619         if (!strcmp(var, "core.pager"))
 620                 return git_config_string(&pager_program, var, value);
 621
 622         if (!strcmp(var, "core.editor"))
 623                 return git_config_string(&editor_program, var, value);
 624
 625         if (!strcmp(var, "core.askpass"))
 626                 return git_config_string(&askpass_program, var, value);
 627
 628         if (!strcmp(var, "core.excludesfile"))
 629                 return git_config_pathname(&excludes_file, var, value);
 630
 631         if (!strcmp(var, "core.whitespace")) {
 632                 if (!value)
 633                         return config_error_nonbool(var);
 634                 whitespace_rule_cfg = parse_whitespace_rule(value);
 635                 return 0;
 636         }
 637
 638         if (!strcmp(var, "core.fsyncobjectfiles")) {
 639                 fsync_object_files = git_config_bool(var, value);
 640                 return 0;
 641         }
 642
 643         if (!strcmp(var, "core.preloadindex")) {
 644                 core_preload_index = git_config_bool(var, value);
 645                 return 0;
 646         }
 647
 648         if (!strcmp(var, "core.createobject")) {
 649                 if (!strcmp(value, "rename"))
 650                         object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 651                 else if (!strcmp(value, "link"))
 652                         object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 653                 else
 654                         die("Invalid mode for object creation: %s", value);
 655                 return 0;
 656         }
 657
 658         if (!strcmp(var, "core.sparsecheckout")) {
 659                 core_apply_sparse_checkout = git_config_bool(var, value);
 660                 return 0;
 661         }
 662
 663         /* Add other config variables here and to Documentation/config.txt. */
 664         return 0;
 665 }
 666
 667 static int git_default_user_config(const char *var, const char *value)
 668 {
 669         if (!strcmp(var, "user.name")) {
 670                 if (!value)
 671                         return config_error_nonbool(var);
 672                 strlcpy(git_default_name, value, sizeof(git_default_name));
 673                 user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 674                 return 0;
 675         }
 676
 677         if (!strcmp(var, "user.email")) {
 678                 if (!value)
 679                         return config_error_nonbool(var);
 680                 strlcpy(git_default_email, value, sizeof(git_default_email));
 681                 user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 682                 return 0;
 683         }
 684
 685         /* Add other config variables here and to Documentation/config.txt. */
 686         return 0;
 687 }
 688
 689 static int git_default_i18n_config(const char *var, const char *value)
 690 {
 691         if (!strcmp(var, "i18n.commitencoding"))
 692                 return git_config_string(&git_commit_encoding, var, value);
 693
 694         if (!strcmp(var, "i18n.logoutputencoding"))
 695                 return git_config_string(&git_log_output_encoding, var, value);
 696
 697         /* Add other config variables here and to Documentation/config.txt. */
 698         return 0;
 699 }
 700
 701 static int git_default_branch_config(const char *var, const char *value)
 702 {
 703         if (!strcmp(var, "branch.autosetupmerge")) {
 704                 if (value && !strcasecmp(value, "always")) {
 705                         git_branch_track = BRANCH_TRACK_ALWAYS;
 706                         return 0;
 707                 }
 708                 git_branch_track = git_config_bool(var, value);
 709                 return 0;
 710         }
 711         if (!strcmp(var, "branch.autosetuprebase")) {
 712                 if (!value)
 713                         return config_error_nonbool(var);
 714                 else if (!strcmp(value, "never"))
 715                         autorebase = AUTOREBASE_NEVER;
 716                 else if (!strcmp(value, "local"))
 717                         autorebase = AUTOREBASE_LOCAL;
 718                 else if (!strcmp(value, "remote"))
 719                         autorebase = AUTOREBASE_REMOTE;
 720                 else if (!strcmp(value, "always"))
 721                         autorebase = AUTOREBASE_ALWAYS;
 722                 else
 723                         return error("Malformed value for %s", var);
 724                 return 0;
 725         }
 726
 727         /* Add other config variables here and to Documentation/config.txt. */
 728         return 0;
 729 }
 730
 731 static int git_default_push_config(const char *var, const char *value)
 732 {
 733         if (!strcmp(var, "push.default")) {
 734                 if (!value)
 735                         return config_error_nonbool(var);
 736                 else if (!strcmp(value, "nothing"))
 737                         push_default = PUSH_DEFAULT_NOTHING;
 738                 else if (!strcmp(value, "matching"))
 739                         push_default = PUSH_DEFAULT_MATCHING;
 740                 else if (!strcmp(value, "tracking"))
 741                         push_default = PUSH_DEFAULT_TRACKING;
 742                 else if (!strcmp(value, "current"))
 743                         push_default = PUSH_DEFAULT_CURRENT;
 744                 else {
 745                         error("Malformed value for %s: %s", var, value);
 746                         return error("Must be one of nothing, matching, "
 747                                      "tracking or current.");
 748                 }
 749                 return 0;
 750         }
 751
 752         /* Add other config variables here and to Documentation/config.txt. */
 753         return 0;
 754 }
 755
 756 static int git_default_mailmap_config(const char *var, const char *value)
 757 {
 758         if (!strcmp(var, "mailmap.file"))
 759                 return git_config_string(&git_mailmap_file, var, value);
 760
 761         /* Add other config variables here and to Documentation/config.txt. */
 762         return 0;
 763 }
 764
 765 int git_default_config(const char *var, const char *value, void *dummy)
 766 {
 767         if (!prefixcmp(var, "core."))
 768                 return git_default_core_config(var, value);
 769
 770         if (!prefixcmp(var, "user."))
 771                 return git_default_user_config(var, value);
 772
 773         if (!prefixcmp(var, "i18n."))
 774                 return git_default_i18n_config(var, value);
 775
 776         if (!prefixcmp(var, "branch."))
 777                 return git_default_branch_config(var, value);
 778
 779         if (!prefixcmp(var, "push."))
 780                 return git_default_push_config(var, value);
 781
 782         if (!prefixcmp(var, "mailmap."))
 783                 return git_default_mailmap_config(var, value);
 784
 785         if (!prefixcmp(var, "advice."))
 786                 return git_default_advice_config(var, value);
 787
 788         if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 789                 pager_use_color = git_config_bool(var,value);
 790                 return 0;
 791         }
 792
 793         /* Add other config variables here and to Documentation/config.txt. */
 794         return 0;
 795 }
 796
 797 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 798 {
 799         int ret;
 800         FILE *f = fopen(filename, "r");
 801
 802         ret = -1;
 803         if (f) {
 804                 config_file = f;
 805                 config_file_name = filename;
 806                 config_linenr = 1;
 807                 config_file_eof = 0;
 808                 ret = git_parse_file(fn, data);
 809                 fclose(f);
 810                 config_file_name = NULL;
 811         }
 812         return ret;
 813 }
 814
 815 const char *git_etc_gitconfig(void)
 816 {
 817         static const char *system_wide;
 818         if (!system_wide)
 819                 system_wide = system_path(ETC_GITCONFIG);
 820         return system_wide;
 821 }
 822
 823 int git_env_bool(const char *k, int def)
 824 {
 825         const char *v = getenv(k);
 826         return v ? git_config_bool(k, v) : def;
 827 }
 828
 829 int git_config_system(void)
 830 {
 831         return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 832 }
 833
 834 int git_config_global(void)
 835 {
 836         return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
 837 }
 838
 839 int git_config_from_parameters(config_fn_t fn, void *data)
 840 {
 841         static int loaded_environment;
 842         const struct config_item *ct;
 843
 844         if (!loaded_environment) {
 845                 if (git_config_parse_environment() < 0)
 846                         return -1;
 847                 loaded_environment = 1;
 848         }
 849         for (ct = config_parameters; ct; ct = ct->next)
 850                 if (fn(ct->name, ct->value, data) < 0)
 851                         return -1;
 852         return 0;
 853 }
 854
 855 int git_config(config_fn_t fn, void *data)
 856 {
 857         int ret = 0, found = 0;
 858         char *repo_config = NULL;
 859         const char *home = NULL;
 860
 861         /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
 862         if (config_exclusive_filename)
 863                 return git_config_from_file(fn, config_exclusive_filename, data);
 864         if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 865                 ret += git_config_from_file(fn, git_etc_gitconfig(),
 866                                             data);
 867                 found += 1;
 868         }
 869
 870         home = getenv("HOME");
 871         if (git_config_global() && home) {
 872                 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
 873                 if (!access(user_config, R_OK)) {
 874                         ret += git_config_from_file(fn, user_config, data);
 875                         found += 1;
 876                 }
 877                 free(user_config);
 878         }
 879
 880         repo_config = git_pathdup("config");
 881         if (!access(repo_config, R_OK)) {
 882                 ret += git_config_from_file(fn, repo_config, data);
 883                 found += 1;
 884         }
 885         free(repo_config);
 886
 887         ret += git_config_from_parameters(fn, data);
 888         if (config_parameters)
 889                 found += 1;
 890
 891         return ret == 0 ? found : ret;
 892 }
 893
 894 /*
 895  * Find all the stuff for git_config_set() below.
 896  */
 897
 898 #define MAX_MATCHES 512
 899
 900 static struct {
 901         int baselen;
 902         char *key;
 903         int do_not_match;
 904         regex_t *value_regex;
 905         int multi_replace;
 906         size_t offset[MAX_MATCHES];
 907         enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 908         int seen;
 909 } store;
 910
 911 static int matches(const char *key, const char *value)
 912 {
 913         return !strcmp(key, store.key) &&
 914                 (store.value_regex == NULL ||
 915                  (store.do_not_match ^
 916                   !regexec(store.value_regex, value, 0, NULL, 0)));
 917 }
 918
 919 static int store_aux(const char *key, const char *value, void *cb)
 920 {
 921         const char *ep;
 922         size_t section_len;
 923
 924         switch (store.state) {
 925         case KEY_SEEN:
 926                 if (matches(key, value)) {
 927                         if (store.seen == 1 && store.multi_replace == 0) {
 928                                 warning("%s has multiple values", key);
 929                         } else if (store.seen >= MAX_MATCHES) {
 930                                 error("too many matches for %s", key);
 931                                 return 1;
 932                         }
 933
 934                         store.offset[store.seen] = ftell(config_file);
 935                         store.seen++;
 936                 }
 937                 break;
 938         case SECTION_SEEN:
 939                 /*
 940                  * What we are looking for is in store.key (both
 941                  * section and var), and its section part is baselen
 942                  * long.  We found key (again, both section and var).
 943                  * We would want to know if this key is in the same
 944                  * section as what we are looking for.  We already
 945                  * know we are in the same section as what should
 946                  * hold store.key.
 947                  */
 948                 ep = strrchr(key, '.');
 949                 section_len = ep - key;
 950
 951                 if ((section_len != store.baselen) ||
 952                     memcmp(key, store.key, section_len+1)) {
 953                         store.state = SECTION_END_SEEN;
 954                         break;
 955                 }
 956
 957                 /*
 958                  * Do not increment matches: this is no match, but we
 959                  * just made sure we are in the desired section.
 960                  */
 961                 store.offset[store.seen] = ftell(config_file);
 962                 /* fallthru */
 963         case SECTION_END_SEEN:
 964         case START:
 965                 if (matches(key, value)) {
 966                         store.offset[store.seen] = ftell(config_file);
 967                         store.state = KEY_SEEN;
 968                         store.seen++;
 969                 } else {
 970                         if (strrchr(key, '.') - key == store.baselen &&
 971                               !strncmp(key, store.key, store.baselen)) {
 972                                         store.state = SECTION_SEEN;
 973                                         store.offset[store.seen] = ftell(config_file);
 974                         }
 975                 }
 976         }
 977         return 0;
 978 }
 979
 980 static int write_error(const char *filename)
 981 {
 982         error("failed to write new configuration file %s", filename);
 983
 984         /* Same error code as "failed to rename". */
 985         return 4;
 986 }
 987
 988 static int store_write_section(int fd, const char *key)
 989 {
 990         const char *dot;
 991         int i, success;
 992         struct strbuf sb = STRBUF_INIT;
 993
 994         dot = memchr(key, '.', store.baselen);
 995         if (dot) {
 996                 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
 997                 for (i = dot - key + 1; i < store.baselen; i++) {
 998                         if (key[i] == '"' || key[i] == '\\')
 999                                 strbuf_addch(&sb, '\\');
1000                         strbuf_addch(&sb, key[i]);
1001                 }
1002                 strbuf_addstr(&sb, "\"]\n");
1003         } else {
1004                 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1005         }
1006
1007         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1008         strbuf_release(&sb);
1009
1010         return success;
1011 }
1012
1013 static int store_write_pair(int fd, const char *key, const char *value)
1014 {
1015         int i, success;
1016         int length = strlen(key + store.baselen + 1);
1017         const char *quote = "";
1018         struct strbuf sb = STRBUF_INIT;
1019
1020         /*
1021          * Check to see if the value needs to be surrounded with a dq pair.
1022          * Note that problematic characters are always backslash-quoted; this
1023          * check is about not losing leading or trailing SP and strings that
1024          * follow beginning-of-comment characters (i.e. ';' and '#') by the
1025          * configuration parser.
1026          */
1027         if (value[0] == ' ')
1028                 quote = "\"";
1029         for (i = 0; value[i]; i++)
1030                 if (value[i] == ';' || value[i] == '#')
1031                         quote = "\"";
1032         if (i && value[i - 1] == ' ')
1033                 quote = "\"";
1034
1035         strbuf_addf(&sb, "\t%.*s = %s",
1036                     length, key + store.baselen + 1, quote);
1037
1038         for (i = 0; value[i]; i++)
1039                 switch (value[i]) {
1040                 case '\n':
1041                         strbuf_addstr(&sb, "\\n");
1042                         break;
1043                 case '\t':
1044                         strbuf_addstr(&sb, "\\t");
1045                         break;
1046                 case '"':
1047                 case '\\':
1048                         strbuf_addch(&sb, '\\');
1049                 default:
1050                         strbuf_addch(&sb, value[i]);
1051                         break;
1052                 }
1053         strbuf_addf(&sb, "%s\n", quote);
1054
1055         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1056         strbuf_release(&sb);
1057
1058         return success;
1059 }
1060
1061 static ssize_t find_beginning_of_line(const char *contents, size_t size,
1062         size_t offset_, int *found_bracket)
1063 {
1064         size_t equal_offset = size, bracket_offset = size;
1065         ssize_t offset;
1066
1067 contline:
1068         for (offset = offset_-2; offset > 0
1069                         && contents[offset] != '\n'; offset--)
1070                 switch (contents[offset]) {
1071                         case '=': equal_offset = offset; break;
1072                         case ']': bracket_offset = offset; break;
1073                 }
1074         if (offset > 0 && contents[offset-1] == '\\') {
1075                 offset_ = offset;
1076                 goto contline;
1077         }
1078         if (bracket_offset < equal_offset) {
1079                 *found_bracket = 1;
1080                 offset = bracket_offset+1;
1081         } else
1082                 offset++;
1083
1084         return offset;
1085 }
1086
1087 int git_config_set(const char *key, const char *value)
1088 {
1089         return git_config_set_multivar(key, value, NULL, 0);
1090 }
1091
1092 /*
1093  * If value==NULL, unset in (remove from) config,
1094  * if value_regex!=NULL, disregard key/value pairs where value does not match.
1095  * if multi_replace==0, nothing, or only one matching key/value is replaced,
1096  *     else all matching key/values (regardless how many) are removed,
1097  *     before the new pair is written.
1098  *
1099  * Returns 0 on success.
1100  *
1101  * This function does this:
1102  *
1103  * - it locks the config file by creating ".git/config.lock"
1104  *
1105  * - it then parses the config using store_aux() as validator to find
1106  *   the position on the key/value pair to replace. If it is to be unset,
1107  *   it must be found exactly once.
1108  *
1109  * - the config file is mmap()ed and the part before the match (if any) is
1110  *   written to the lock file, then the changed part and the rest.
1111  *
1112  * - the config file is removed and the lock file rename()d to it.
1113  *
1114  */
1115 int git_config_set_multivar(const char *key, const char *value,
1116         const char *value_regex, int multi_replace)
1117 {
1118         int i, dot;
1119         int fd = -1, in_fd;
1120         int ret;
1121         char *config_filename;
1122         struct lock_file *lock = NULL;
1123         const char *last_dot = strrchr(key, '.');
1124
1125         if (config_exclusive_filename)
1126                 config_filename = xstrdup(config_exclusive_filename);
1127         else
1128                 config_filename = git_pathdup("config");
1129
1130         /*
1131          * Since "key" actually contains the section name and the real
1132          * key name separated by a dot, we have to know where the dot is.
1133          */
1134
1135         if (last_dot == NULL) {
1136                 error("key does not contain a section: %s", key);
1137                 ret = 2;
1138                 goto out_free;
1139         }
1140         store.baselen = last_dot - key;
1141
1142         store.multi_replace = multi_replace;
1143
1144         /*
1145          * Validate the key and while at it, lower case it for matching.
1146          */
1147         store.key = xmalloc(strlen(key) + 1);
1148         dot = 0;
1149         for (i = 0; key[i]; i++) {
1150                 unsigned char c = key[i];
1151                 if (c == '.')
1152                         dot = 1;
1153                 /* Leave the extended basename untouched.. */
1154                 if (!dot || i > store.baselen) {
1155                         if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
1156                                 error("invalid key: %s", key);
1157                                 free(store.key);
1158                                 ret = 1;
1159                                 goto out_free;
1160                         }
1161                         c = tolower(c);
1162                 } else if (c == '\n') {
1163                         error("invalid key (newline): %s", key);
1164                         free(store.key);
1165                         ret = 1;
1166                         goto out_free;
1167                 }
1168                 store.key[i] = c;
1169         }
1170         store.key[i] = 0;
1171
1172         /*
1173          * The lock serves a purpose in addition to locking: the new
1174          * contents of .git/config will be written into it.
1175          */
1176         lock = xcalloc(sizeof(struct lock_file), 1);
1177         fd = hold_lock_file_for_update(lock, config_filename, 0);
1178         if (fd < 0) {
1179                 error("could not lock config file %s: %s", config_filename, strerror(errno));
1180                 free(store.key);
1181                 ret = -1;
1182                 goto out_free;
1183         }
1184
1185         /*
1186          * If .git/config does not exist yet, write a minimal version.
1187          */
1188         in_fd = open(config_filename, O_RDONLY);
1189         if ( in_fd < 0 ) {
1190                 free(store.key);
1191
1192                 if ( ENOENT != errno ) {
1193                         error("opening %s: %s", config_filename,
1194                               strerror(errno));
1195                         ret = 3; /* same as "invalid config file" */
1196                         goto out_free;
1197                 }
1198                 /* if nothing to unset, error out */
1199                 if (value == NULL) {
1200                         ret = 5;
1201                         goto out_free;
1202                 }
1203
1204                 store.key = (char *)key;
1205                 if (!store_write_section(fd, key) ||
1206                     !store_write_pair(fd, key, value))
1207                         goto write_err_out;
1208         } else {
1209                 struct stat st;
1210                 char *contents;
1211                 size_t contents_sz, copy_begin, copy_end;
1212                 int i, new_line = 0;
1213
1214                 if (value_regex == NULL)
1215                         store.value_regex = NULL;
1216                 else {
1217                         if (value_regex[0] == '!') {
1218                                 store.do_not_match = 1;
1219                                 value_regex++;
1220                         } else
1221                                 store.do_not_match = 0;
1222
1223                         store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1224                         if (regcomp(store.value_regex, value_regex,
1225                                         REG_EXTENDED)) {
1226                                 error("invalid pattern: %s", value_regex);
1227                                 free(store.value_regex);
1228                                 ret = 6;
1229                                 goto out_free;
1230                         }
1231                 }
1232
1233                 store.offset[0] = 0;
1234                 store.state = START;
1235                 store.seen = 0;
1236
1237                 /*
1238                  * After this, store.offset will contain the *end* offset
1239                  * of the last match, or remain at 0 if no match was found.
1240                  * As a side effect, we make sure to transform only a valid
1241                  * existing config file.
1242                  */
1243                 if (git_config_from_file(store_aux, config_filename, NULL)) {
1244                         error("invalid config file %s", config_filename);
1245                         free(store.key);
1246                         if (store.value_regex != NULL) {
1247                                 regfree(store.value_regex);
1248                                 free(store.value_regex);
1249                         }
1250                         ret = 3;
1251                         goto out_free;
1252                 }
1253
1254                 free(store.key);
1255                 if (store.value_regex != NULL) {
1256                         regfree(store.value_regex);
1257                         free(store.value_regex);
1258                 }
1259
1260                 /* if nothing to unset, or too many matches, error out */
1261                 if ((store.seen == 0 && value == NULL) ||
1262                                 (store.seen > 1 && multi_replace == 0)) {
1263                         ret = 5;
1264                         goto out_free;
1265                 }
1266
1267                 fstat(in_fd, &st);
1268                 contents_sz = xsize_t(st.st_size);
1269                 contents = xmmap(NULL, contents_sz, PROT_READ,
1270                         MAP_PRIVATE, in_fd, 0);
1271                 close(in_fd);
1272
1273                 if (store.seen == 0)
1274                         store.seen = 1;
1275
1276                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1277                         if (store.offset[i] == 0) {
1278                                 store.offset[i] = copy_end = contents_sz;
1279                         } else if (store.state != KEY_SEEN) {
1280                                 copy_end = store.offset[i];
1281                         } else
1282                                 copy_end = find_beginning_of_line(
1283                                         contents, contents_sz,
1284                                         store.offset[i]-2, &new_line);
1285
1286                         if (copy_end > 0 && contents[copy_end-1] != '\n')
1287                                 new_line = 1;
1288
1289                         /* write the first part of the config */
1290                         if (copy_end > copy_begin) {
1291                                 if (write_in_full(fd, contents + copy_begin,
1292                                                   copy_end - copy_begin) <
1293                                     copy_end - copy_begin)
1294                                         goto write_err_out;
1295                                 if (new_line &&
1296                                     write_str_in_full(fd, "\n") != 1)
1297                                         goto write_err_out;
1298                         }
1299                         copy_begin = store.offset[i];
1300                 }
1301
1302                 /* write the pair (value == NULL means unset) */
1303                 if (value != NULL) {
1304                         if (store.state == START) {
1305                                 if (!store_write_section(fd, key))
1306                                         goto write_err_out;
1307                         }
1308                         if (!store_write_pair(fd, key, value))
1309                                 goto write_err_out;
1310                 }
1311
1312                 /* write the rest of the config */
1313                 if (copy_begin < contents_sz)
1314                         if (write_in_full(fd, contents + copy_begin,
1315                                           contents_sz - copy_begin) <
1316                             contents_sz - copy_begin)
1317                                 goto write_err_out;
1318
1319                 munmap(contents, contents_sz);
1320         }
1321
1322         if (commit_lock_file(lock) < 0) {
1323                 error("could not commit config file %s", config_filename);
1324                 ret = 4;
1325                 goto out_free;
1326         }
1327
1328         /*
1329          * lock is committed, so don't try to roll it back below.
1330          * NOTE: Since lockfile.c keeps a linked list of all created
1331          * lock_file structures, it isn't safe to free(lock).  It's
1332          * better to just leave it hanging around.
1333          */
1334         lock = NULL;
1335         ret = 0;
1336
1337 out_free:
1338         if (lock)
1339                 rollback_lock_file(lock);
1340         free(config_filename);
1341         return ret;
1342
1343 write_err_out:
1344         ret = write_error(lock->filename);
1345         goto out_free;
1346
1347 }
1348
1349 static int section_name_match (const char *buf, const char *name)
1350 {
1351         int i = 0, j = 0, dot = 0;
1352         if (buf[i] != '[')
1353                 return 0;
1354         for (i = 1; buf[i] && buf[i] != ']'; i++) {
1355                 if (!dot && isspace(buf[i])) {
1356                         dot = 1;
1357                         if (name[j++] != '.')
1358                                 break;
1359                         for (i++; isspace(buf[i]); i++)
1360                                 ; /* do nothing */
1361                         if (buf[i] != '"')
1362                                 break;
1363                         continue;
1364                 }
1365                 if (buf[i] == '\\' && dot)
1366                         i++;
1367                 else if (buf[i] == '"' && dot) {
1368                         for (i++; isspace(buf[i]); i++)
1369                                 ; /* do_nothing */
1370                         break;
1371                 }
1372                 if (buf[i] != name[j++])
1373                         break;
1374         }
1375         if (buf[i] == ']' && name[j] == 0) {
1376                 /*
1377                  * We match, now just find the right length offset by
1378                  * gobbling up any whitespace after it, as well
1379                  */
1380                 i++;
1381                 for (; buf[i] && isspace(buf[i]); i++)
1382                         ; /* do nothing */
1383                 return i;
1384         }
1385         return 0;
1386 }
1387
1388 /* if new_name == NULL, the section is removed instead */
1389 int git_config_rename_section(const char *old_name, const char *new_name)
1390 {
1391         int ret = 0, remove = 0;
1392         char *config_filename;
1393         struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1394         int out_fd;
1395         char buf[1024];
1396
1397         if (config_exclusive_filename)
1398                 config_filename = xstrdup(config_exclusive_filename);
1399         else
1400                 config_filename = git_pathdup("config");
1401         out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1402         if (out_fd < 0) {
1403                 ret = error("could not lock config file %s", config_filename);
1404                 goto out;
1405         }
1406
1407         if (!(config_file = fopen(config_filename, "rb"))) {
1408                 /* no config file means nothing to rename, no error */
1409                 goto unlock_and_out;
1410         }
1411
1412         while (fgets(buf, sizeof(buf), config_file)) {
1413                 int i;
1414                 int length;
1415                 char *output = buf;
1416                 for (i = 0; buf[i] && isspace(buf[i]); i++)
1417                         ; /* do nothing */
1418                 if (buf[i] == '[') {
1419                         /* it's a section */
1420                         int offset = section_name_match(&buf[i], old_name);
1421                         if (offset > 0) {
1422                                 ret++;
1423                                 if (new_name == NULL) {
1424                                         remove = 1;
1425                                         continue;
1426                                 }
1427                                 store.baselen = strlen(new_name);
1428                                 if (!store_write_section(out_fd, new_name)) {
1429                                         ret = write_error(lock->filename);
1430                                         goto out;
1431                                 }
1432                                 /*
1433                                  * We wrote out the new section, with
1434                                  * a newline, now skip the old
1435                                  * section's length
1436                                  */
1437                                 output += offset + i;
1438                                 if (strlen(output) > 0) {
1439                                         /*
1440                                          * More content means there's
1441                                          * a declaration to put on the
1442                                          * next line; indent with a
1443                                          * tab
1444                                          */
1445                                         output -= 1;
1446                                         output[0] = '\t';
1447                                 }
1448                         }
1449                         remove = 0;
1450                 }
1451                 if (remove)
1452                         continue;
1453                 length = strlen(output);
1454                 if (write_in_full(out_fd, output, length) != length) {
1455                         ret = write_error(lock->filename);
1456                         goto out;
1457                 }
1458         }
1459         fclose(config_file);
1460  unlock_and_out:
1461         if (commit_lock_file(lock) < 0)
1462                 ret = error("could not commit config file %s", config_filename);
1463  out:
1464         free(config_filename);
1465         return ret;
1466 }
1467
1468 /*
1469  * Call this to report error for your variable that should not
1470  * get a boolean value (i.e. "[my] var" means "true").
1471  */
1472 int config_error_nonbool(const char *var)
1473 {
1474         return error("Missing value for '%s'", var);
1475 }