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 static void lowercase(char *p)
  24 {
  25         for (; *p; p++)
  26                 *p = tolower(*p);
  27 }
  28
  29 void git_config_push_parameter(const char *text)
  30 {
  31         struct strbuf env = STRBUF_INIT;
  32         const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
  33         if (old) {
  34                 strbuf_addstr(&env, old);
  35                 strbuf_addch(&env, ' ');
  36         }
  37         sq_quote_buf(&env, text);
  38         setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
  39         strbuf_release(&env);
  40 }
  41
  42 static int git_config_parse_parameter(const char *text,
  43                                       config_fn_t fn, void *data)
  44 {
  45         struct strbuf tmp = STRBUF_INIT;
  46         struct strbuf **pair;
  47         strbuf_addstr(&tmp, text);
  48         pair = strbuf_split(&tmp, '=');
  49         if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
  50                 strbuf_setlen(pair[0], pair[0]->len - 1);
  51         strbuf_trim(pair[0]);
  52         if (!pair[0]->len) {
  53                 strbuf_list_free(pair);
  54                 return error("bogus config parameter: %s", text);
  55         }
  56         lowercase(pair[0]->buf);
  57         if (fn(pair[0]->buf, pair[1] ? pair[1]->buf : NULL, data) < 0) {
  58                 strbuf_list_free(pair);
  59                 return -1;
  60         }
  61         strbuf_list_free(pair);
  62         return 0;
  63 }
  64
  65 int git_config_from_parameters(config_fn_t fn, void *data)
  66 {
  67         const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
  68         char *envw;
  69         const char **argv = NULL;
  70         int nr = 0, alloc = 0;
  71         int i;
  72
  73         if (!env)
  74                 return 0;
  75         /* sq_dequote will write over it */
  76         envw = xstrdup(env);
  77
  78         if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
  79                 free(envw);
  80                 return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
  81         }
  82
  83         for (i = 0; i < nr; i++) {
  84                 if (git_config_parse_parameter(argv[i], fn, data) < 0) {
  85                         free(argv);
  86                         free(envw);
  87                         return -1;
  88                 }
  89         }
  90
  91         free(argv);
  92         free(envw);
  93         return nr > 0;
  94 }
  95
  96 static int get_next_char(void)
  97 {
  98         int c;
  99         FILE *f;
 100
 101         c = '\n';
 102         if ((f = config_file) != NULL) {
 103                 c = fgetc(f);
 104                 if (c == '\r') {
 105                         /* DOS like systems */
 106                         c = fgetc(f);
 107                         if (c != '\n') {
 108                                 ungetc(c, f);
 109                                 c = '\r';
 110                         }
 111                 }
 112                 if (c == '\n')
 113                         config_linenr++;
 114                 if (c == EOF) {
 115                         config_file_eof = 1;
 116                         c = '\n';
 117                 }
 118         }
 119         return c;
 120 }
 121
 122 static char *parse_value(void)
 123 {
 124         static char value[1024];
 125         int quote = 0, comment = 0, len = 0, space = 0;
 126
 127         for (;;) {
 128                 int c = get_next_char();
 129                 if (len >= sizeof(value) - 1)
 130                         return NULL;
 131                 if (c == '\n') {
 132                         if (quote)
 133                                 return NULL;
 134                         value[len] = 0;
 135                         return value;
 136                 }
 137                 if (comment)
 138                         continue;
 139                 if (isspace(c) && !quote) {
 140                         if (len)
 141                                 space++;
 142                         continue;
 143                 }
 144                 if (!quote) {
 145                         if (c == ';' || c == '#') {
 146                                 comment = 1;
 147                                 continue;
 148                         }
 149                 }
 150                 for (; space; space--)
 151                         value[len++] = ' ';
 152                 if (c == '\\') {
 153                         c = get_next_char();
 154                         switch (c) {
 155                         case '\n':
 156                                 continue;
 157                         case 't':
 158                                 c = '\t';
 159                                 break;
 160                         case 'b':
 161                                 c = '\b';
 162                                 break;
 163                         case 'n':
 164                                 c = '\n';
 165                                 break;
 166                         /* Some characters escape as themselves */
 167                         case '\\': case '"':
 168                                 break;
 169                         /* Reject unknown escape sequences */
 170                         default:
 171                                 return NULL;
 172                         }
 173                         value[len++] = c;
 174                         continue;
 175                 }
 176                 if (c == '"') {
 177                         quote = 1-quote;
 178                         continue;
 179                 }
 180                 value[len++] = c;
 181         }
 182 }
 183
 184 static inline int iskeychar(int c)
 185 {
 186         return isalnum(c) || c == '-';
 187 }
 188
 189 static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
 190 {
 191         int c;
 192         char *value;
 193
 194         /* Get the full name */
 195         for (;;) {
 196                 c = get_next_char();
 197                 if (config_file_eof)
 198                         break;
 199                 if (!iskeychar(c))
 200                         break;
 201                 name[len++] = tolower(c);
 202                 if (len >= MAXNAME)
 203                         return -1;
 204         }
 205         name[len] = 0;
 206         while (c == ' ' || c == '\t')
 207                 c = get_next_char();
 208
 209         value = NULL;
 210         if (c != '\n') {
 211                 if (c != '=')
 212                         return -1;
 213                 value = parse_value();
 214                 if (!value)
 215                         return -1;
 216         }
 217         return fn(name, value, data);
 218 }
 219
 220 static int get_extended_base_var(char *name, int baselen, int c)
 221 {
 222         do {
 223                 if (c == '\n')
 224                         return -1;
 225                 c = get_next_char();
 226         } while (isspace(c));
 227
 228         /* We require the format to be '[base "extension"]' */
 229         if (c != '"')
 230                 return -1;
 231         name[baselen++] = '.';
 232
 233         for (;;) {
 234                 int c = get_next_char();
 235                 if (c == '\n')
 236                         return -1;
 237                 if (c == '"')
 238                         break;
 239                 if (c == '\\') {
 240                         c = get_next_char();
 241                         if (c == '\n')
 242                                 return -1;
 243                 }
 244                 name[baselen++] = c;
 245                 if (baselen > MAXNAME / 2)
 246                         return -1;
 247         }
 248
 249         /* Final ']' */
 250         if (get_next_char() != ']')
 251                 return -1;
 252         return baselen;
 253 }
 254
 255 static int get_base_var(char *name)
 256 {
 257         int baselen = 0;
 258
 259         for (;;) {
 260                 int c = get_next_char();
 261                 if (config_file_eof)
 262                         return -1;
 263                 if (c == ']')
 264                         return baselen;
 265                 if (isspace(c))
 266                         return get_extended_base_var(name, baselen, c);
 267                 if (!iskeychar(c) && c != '.')
 268                         return -1;
 269                 if (baselen > MAXNAME / 2)
 270                         return -1;
 271                 name[baselen++] = tolower(c);
 272         }
 273 }
 274
 275 static int git_parse_file(config_fn_t fn, void *data)
 276 {
 277         int comment = 0;
 278         int baselen = 0;
 279         static char var[MAXNAME];
 280
 281         /* U+FEFF Byte Order Mark in UTF8 */
 282         static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 283         const unsigned char *bomptr = utf8_bom;
 284
 285         for (;;) {
 286                 int c = get_next_char();
 287                 if (bomptr && *bomptr) {
 288                         /* We are at the file beginning; skip UTF8-encoded BOM
 289                          * if present. Sane editors won't put this in on their
 290                          * own, but e.g. Windows Notepad will do it happily. */
 291                         if ((unsigned char) c == *bomptr) {
 292                                 bomptr++;
 293                                 continue;
 294                         } else {
 295                                 /* Do not tolerate partial BOM. */
 296                                 if (bomptr != utf8_bom)
 297                                         break;
 298                                 /* No BOM at file beginning. Cool. */
 299                                 bomptr = NULL;
 300                         }
 301                 }
 302                 if (c == '\n') {
 303                         if (config_file_eof)
 304                                 return 0;
 305                         comment = 0;
 306                         continue;
 307                 }
 308                 if (comment || isspace(c))
 309                         continue;
 310                 if (c == '#' || c == ';') {
 311                         comment = 1;
 312                         continue;
 313                 }
 314                 if (c == '[') {
 315                         baselen = get_base_var(var);
 316                         if (baselen <= 0)
 317                                 break;
 318                         var[baselen++] = '.';
 319                         var[baselen] = 0;
 320                         continue;
 321                 }
 322                 if (!isalpha(c))
 323                         break;
 324                 var[baselen] = tolower(c);
 325                 if (get_value(fn, data, var, baselen+1) < 0)
 326                         break;
 327         }
 328         die("bad config file line %d in %s", config_linenr, config_file_name);
 329 }
 330
 331 static int parse_unit_factor(const char *end, unsigned long *val)
 332 {
 333         if (!*end)
 334                 return 1;
 335         else if (!strcasecmp(end, "k")) {
 336                 *val *= 1024;
 337                 return 1;
 338         }
 339         else if (!strcasecmp(end, "m")) {
 340                 *val *= 1024 * 1024;
 341                 return 1;
 342         }
 343         else if (!strcasecmp(end, "g")) {
 344                 *val *= 1024 * 1024 * 1024;
 345                 return 1;
 346         }
 347         return 0;
 348 }
 349
 350 static int git_parse_long(const char *value, long *ret)
 351 {
 352         if (value && *value) {
 353                 char *end;
 354                 long val = strtol(value, &end, 0);
 355                 unsigned long factor = 1;
 356                 if (!parse_unit_factor(end, &factor))
 357                         return 0;
 358                 *ret = val * factor;
 359                 return 1;
 360         }
 361         return 0;
 362 }
 363
 364 int git_parse_ulong(const char *value, unsigned long *ret)
 365 {
 366         if (value && *value) {
 367                 char *end;
 368                 unsigned long val = strtoul(value, &end, 0);
 369                 if (!parse_unit_factor(end, &val))
 370                         return 0;
 371                 *ret = val;
 372                 return 1;
 373         }
 374         return 0;
 375 }
 376
 377 static void die_bad_config(const char *name)
 378 {
 379         if (config_file_name)
 380                 die("bad config value for '%s' in %s", name, config_file_name);
 381         die("bad config value for '%s'", name);
 382 }
 383
 384 int git_config_int(const char *name, const char *value)
 385 {
 386         long ret = 0;
 387         if (!git_parse_long(value, &ret))
 388                 die_bad_config(name);
 389         return ret;
 390 }
 391
 392 unsigned long git_config_ulong(const char *name, const char *value)
 393 {
 394         unsigned long ret;
 395         if (!git_parse_ulong(value, &ret))
 396                 die_bad_config(name);
 397         return ret;
 398 }
 399
 400 static int git_config_maybe_bool_text(const char *name, const char *value)
 401 {
 402         if (!value)
 403                 return 1;
 404         if (!*value)
 405                 return 0;
 406         if (!strcasecmp(value, "true")
 407             || !strcasecmp(value, "yes")
 408             || !strcasecmp(value, "on"))
 409                 return 1;
 410         if (!strcasecmp(value, "false")
 411             || !strcasecmp(value, "no")
 412             || !strcasecmp(value, "off"))
 413                 return 0;
 414         return -1;
 415 }
 416
 417 int git_config_maybe_bool(const char *name, const char *value)
 418 {
 419         long v = git_config_maybe_bool_text(name, value);
 420         if (0 <= v)
 421                 return v;
 422         if (git_parse_long(value, &v))
 423                 return !!v;
 424         return -1;
 425 }
 426
 427 int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 428 {
 429         int v = git_config_maybe_bool_text(name, value);
 430         if (0 <= v) {
 431                 *is_bool = 1;
 432                 return v;
 433         }
 434         *is_bool = 0;
 435         return git_config_int(name, value);
 436 }
 437
 438 int git_config_bool(const char *name, const char *value)
 439 {
 440         int discard;
 441         return !!git_config_bool_or_int(name, value, &discard);
 442 }
 443
 444 int git_config_string(const char **dest, const char *var, const char *value)
 445 {
 446         if (!value)
 447                 return config_error_nonbool(var);
 448         *dest = xstrdup(value);
 449         return 0;
 450 }
 451
 452 int git_config_pathname(const char **dest, const char *var, const char *value)
 453 {
 454         if (!value)
 455                 return config_error_nonbool(var);
 456         *dest = expand_user_path(value);
 457         if (!*dest)
 458                 die("Failed to expand user dir in: '%s'", value);
 459         return 0;
 460 }
 461
 462 static int git_default_core_config(const char *var, const char *value)
 463 {
 464         /* This needs a better name */
 465         if (!strcmp(var, "core.filemode")) {
 466                 trust_executable_bit = git_config_bool(var, value);
 467                 return 0;
 468         }
 469         if (!strcmp(var, "core.trustctime")) {
 470                 trust_ctime = git_config_bool(var, value);
 471                 return 0;
 472         }
 473
 474         if (!strcmp(var, "core.quotepath")) {
 475                 quote_path_fully = git_config_bool(var, value);
 476                 return 0;
 477         }
 478
 479         if (!strcmp(var, "core.symlinks")) {
 480                 has_symlinks = git_config_bool(var, value);
 481                 return 0;
 482         }
 483
 484         if (!strcmp(var, "core.ignorecase")) {
 485                 ignore_case = git_config_bool(var, value);
 486                 return 0;
 487         }
 488
 489         if (!strcmp(var, "core.bare")) {
 490                 is_bare_repository_cfg = git_config_bool(var, value);
 491                 return 0;
 492         }
 493
 494         if (!strcmp(var, "core.ignorestat")) {
 495                 assume_unchanged = git_config_bool(var, value);
 496                 return 0;
 497         }
 498
 499         if (!strcmp(var, "core.prefersymlinkrefs")) {
 500                 prefer_symlink_refs = git_config_bool(var, value);
 501                 return 0;
 502         }
 503
 504         if (!strcmp(var, "core.logallrefupdates")) {
 505                 log_all_ref_updates = git_config_bool(var, value);
 506                 return 0;
 507         }
 508
 509         if (!strcmp(var, "core.warnambiguousrefs")) {
 510                 warn_ambiguous_refs = git_config_bool(var, value);
 511                 return 0;
 512         }
 513
 514         if (!strcmp(var, "core.abbrev")) {
 515                 int abbrev = git_config_int(var, value);
 516                 if (abbrev < minimum_abbrev || abbrev > 40)
 517                         return -1;
 518                 default_abbrev = abbrev;
 519                 return 0;
 520         }
 521
 522         if (!strcmp(var, "core.loosecompression")) {
 523                 int level = git_config_int(var, value);
 524                 if (level == -1)
 525                         level = Z_DEFAULT_COMPRESSION;
 526                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 527                         die("bad zlib compression level %d", level);
 528                 zlib_compression_level = level;
 529                 zlib_compression_seen = 1;
 530                 return 0;
 531         }
 532
 533         if (!strcmp(var, "core.compression")) {
 534                 int level = git_config_int(var, value);
 535                 if (level == -1)
 536                         level = Z_DEFAULT_COMPRESSION;
 537                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 538                         die("bad zlib compression level %d", level);
 539                 core_compression_level = level;
 540                 core_compression_seen = 1;
 541                 if (!zlib_compression_seen)
 542                         zlib_compression_level = level;
 543                 return 0;
 544         }
 545
 546         if (!strcmp(var, "core.packedgitwindowsize")) {
 547                 int pgsz_x2 = getpagesize() * 2;
 548                 packed_git_window_size = git_config_int(var, value);
 549
 550                 /* This value must be multiple of (pagesize * 2) */
 551                 packed_git_window_size /= pgsz_x2;
 552                 if (packed_git_window_size < 1)
 553                         packed_git_window_size = 1;
 554                 packed_git_window_size *= pgsz_x2;
 555                 return 0;
 556         }
 557
 558         if (!strcmp(var, "core.bigfilethreshold")) {
 559                 long n = git_config_int(var, value);
 560                 big_file_threshold = 0 < n ? n : 0;
 561                 return 0;
 562         }
 563
 564         if (!strcmp(var, "core.packedgitlimit")) {
 565                 packed_git_limit = git_config_int(var, value);
 566                 return 0;
 567         }
 568
 569         if (!strcmp(var, "core.deltabasecachelimit")) {
 570                 delta_base_cache_limit = git_config_int(var, value);
 571                 return 0;
 572         }
 573
 574         if (!strcmp(var, "core.autocrlf")) {
 575                 if (value && !strcasecmp(value, "input")) {
 576                         if (eol == EOL_CRLF)
 577                                 return error("core.autocrlf=input conflicts with core.eol=crlf");
 578                         auto_crlf = AUTO_CRLF_INPUT;
 579                         return 0;
 580                 }
 581                 auto_crlf = git_config_bool(var, value);
 582                 return 0;
 583         }
 584
 585         if (!strcmp(var, "core.safecrlf")) {
 586                 if (value && !strcasecmp(value, "warn")) {
 587                         safe_crlf = SAFE_CRLF_WARN;
 588                         return 0;
 589                 }
 590                 safe_crlf = git_config_bool(var, value);
 591                 return 0;
 592         }
 593
 594         if (!strcmp(var, "core.eol")) {
 595                 if (value && !strcasecmp(value, "lf"))
 596                         eol = EOL_LF;
 597                 else if (value && !strcasecmp(value, "crlf"))
 598                         eol = EOL_CRLF;
 599                 else if (value && !strcasecmp(value, "native"))
 600                         eol = EOL_NATIVE;
 601                 else
 602                         eol = EOL_UNSET;
 603                 if (eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 604                         return error("core.autocrlf=input conflicts with core.eol=crlf");
 605                 return 0;
 606         }
 607
 608         if (!strcmp(var, "core.notesref")) {
 609                 notes_ref_name = xstrdup(value);
 610                 return 0;
 611         }
 612
 613         if (!strcmp(var, "core.pager"))
 614                 return git_config_string(&pager_program, var, value);
 615
 616         if (!strcmp(var, "core.editor"))
 617                 return git_config_string(&editor_program, var, value);
 618
 619         if (!strcmp(var, "core.askpass"))
 620                 return git_config_string(&askpass_program, var, value);
 621
 622         if (!strcmp(var, "core.excludesfile"))
 623                 return git_config_pathname(&excludes_file, var, value);
 624
 625         if (!strcmp(var, "core.whitespace")) {
 626                 if (!value)
 627                         return config_error_nonbool(var);
 628                 whitespace_rule_cfg = parse_whitespace_rule(value);
 629                 return 0;
 630         }
 631
 632         if (!strcmp(var, "core.fsyncobjectfiles")) {
 633                 fsync_object_files = git_config_bool(var, value);
 634                 return 0;
 635         }
 636
 637         if (!strcmp(var, "core.preloadindex")) {
 638                 core_preload_index = git_config_bool(var, value);
 639                 return 0;
 640         }
 641
 642         if (!strcmp(var, "core.createobject")) {
 643                 if (!strcmp(value, "rename"))
 644                         object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 645                 else if (!strcmp(value, "link"))
 646                         object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 647                 else
 648                         die("Invalid mode for object creation: %s", value);
 649                 return 0;
 650         }
 651
 652         if (!strcmp(var, "core.sparsecheckout")) {
 653                 core_apply_sparse_checkout = git_config_bool(var, value);
 654                 return 0;
 655         }
 656
 657         /* Add other config variables here and to Documentation/config.txt. */
 658         return 0;
 659 }
 660
 661 static int git_default_user_config(const char *var, const char *value)
 662 {
 663         if (!strcmp(var, "user.name")) {
 664                 if (!value)
 665                         return config_error_nonbool(var);
 666                 strlcpy(git_default_name, value, sizeof(git_default_name));
 667                 user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 668                 return 0;
 669         }
 670
 671         if (!strcmp(var, "user.email")) {
 672                 if (!value)
 673                         return config_error_nonbool(var);
 674                 strlcpy(git_default_email, value, sizeof(git_default_email));
 675                 user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 676                 return 0;
 677         }
 678
 679         /* Add other config variables here and to Documentation/config.txt. */
 680         return 0;
 681 }
 682
 683 static int git_default_i18n_config(const char *var, const char *value)
 684 {
 685         if (!strcmp(var, "i18n.commitencoding"))
 686                 return git_config_string(&git_commit_encoding, var, value);
 687
 688         if (!strcmp(var, "i18n.logoutputencoding"))
 689                 return git_config_string(&git_log_output_encoding, var, value);
 690
 691         /* Add other config variables here and to Documentation/config.txt. */
 692         return 0;
 693 }
 694
 695 static int git_default_branch_config(const char *var, const char *value)
 696 {
 697         if (!strcmp(var, "branch.autosetupmerge")) {
 698                 if (value && !strcasecmp(value, "always")) {
 699                         git_branch_track = BRANCH_TRACK_ALWAYS;
 700                         return 0;
 701                 }
 702                 git_branch_track = git_config_bool(var, value);
 703                 return 0;
 704         }
 705         if (!strcmp(var, "branch.autosetuprebase")) {
 706                 if (!value)
 707                         return config_error_nonbool(var);
 708                 else if (!strcmp(value, "never"))
 709                         autorebase = AUTOREBASE_NEVER;
 710                 else if (!strcmp(value, "local"))
 711                         autorebase = AUTOREBASE_LOCAL;
 712                 else if (!strcmp(value, "remote"))
 713                         autorebase = AUTOREBASE_REMOTE;
 714                 else if (!strcmp(value, "always"))
 715                         autorebase = AUTOREBASE_ALWAYS;
 716                 else
 717                         return error("Malformed value for %s", var);
 718                 return 0;
 719         }
 720
 721         /* Add other config variables here and to Documentation/config.txt. */
 722         return 0;
 723 }
 724
 725 static int git_default_push_config(const char *var, const char *value)
 726 {
 727         if (!strcmp(var, "push.default")) {
 728                 if (!value)
 729                         return config_error_nonbool(var);
 730                 else if (!strcmp(value, "nothing"))
 731                         push_default = PUSH_DEFAULT_NOTHING;
 732                 else if (!strcmp(value, "matching"))
 733                         push_default = PUSH_DEFAULT_MATCHING;
 734                 else if (!strcmp(value, "upstream"))
 735                         push_default = PUSH_DEFAULT_UPSTREAM;
 736                 else if (!strcmp(value, "tracking")) /* deprecated */
 737                         push_default = PUSH_DEFAULT_UPSTREAM;
 738                 else if (!strcmp(value, "current"))
 739                         push_default = PUSH_DEFAULT_CURRENT;
 740                 else {
 741                         error("Malformed value for %s: %s", var, value);
 742                         return error("Must be one of nothing, matching, "
 743                                      "tracking or current.");
 744                 }
 745                 return 0;
 746         }
 747
 748         /* Add other config variables here and to Documentation/config.txt. */
 749         return 0;
 750 }
 751
 752 static int git_default_mailmap_config(const char *var, const char *value)
 753 {
 754         if (!strcmp(var, "mailmap.file"))
 755                 return git_config_string(&git_mailmap_file, var, value);
 756
 757         /* Add other config variables here and to Documentation/config.txt. */
 758         return 0;
 759 }
 760
 761 int git_default_config(const char *var, const char *value, void *dummy)
 762 {
 763         if (!prefixcmp(var, "core."))
 764                 return git_default_core_config(var, value);
 765
 766         if (!prefixcmp(var, "user."))
 767                 return git_default_user_config(var, value);
 768
 769         if (!prefixcmp(var, "i18n."))
 770                 return git_default_i18n_config(var, value);
 771
 772         if (!prefixcmp(var, "branch."))
 773                 return git_default_branch_config(var, value);
 774
 775         if (!prefixcmp(var, "push."))
 776                 return git_default_push_config(var, value);
 777
 778         if (!prefixcmp(var, "mailmap."))
 779                 return git_default_mailmap_config(var, value);
 780
 781         if (!prefixcmp(var, "advice."))
 782                 return git_default_advice_config(var, value);
 783
 784         if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 785                 pager_use_color = git_config_bool(var,value);
 786                 return 0;
 787         }
 788
 789         /* Add other config variables here and to Documentation/config.txt. */
 790         return 0;
 791 }
 792
 793 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 794 {
 795         int ret;
 796         FILE *f = fopen(filename, "r");
 797
 798         ret = -1;
 799         if (f) {
 800                 config_file = f;
 801                 config_file_name = filename;
 802                 config_linenr = 1;
 803                 config_file_eof = 0;
 804                 ret = git_parse_file(fn, data);
 805                 fclose(f);
 806                 config_file_name = NULL;
 807         }
 808         return ret;
 809 }
 810
 811 const char *git_etc_gitconfig(void)
 812 {
 813         static const char *system_wide;
 814         if (!system_wide)
 815                 system_wide = system_path(ETC_GITCONFIG);
 816         return system_wide;
 817 }
 818
 819 int git_env_bool(const char *k, int def)
 820 {
 821         const char *v = getenv(k);
 822         return v ? git_config_bool(k, v) : def;
 823 }
 824
 825 int git_config_system(void)
 826 {
 827         return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 828 }
 829
 830 int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 831 {
 832         int ret = 0, found = 0;
 833         const char *home = NULL;
 834
 835         /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
 836         if (config_exclusive_filename)
 837                 return git_config_from_file(fn, config_exclusive_filename, data);
 838         if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 839                 ret += git_config_from_file(fn, git_etc_gitconfig(),
 840                                             data);
 841                 found += 1;
 842         }
 843
 844         home = getenv("HOME");
 845         if (home) {
 846                 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
 847                 if (!access(user_config, R_OK)) {
 848                         ret += git_config_from_file(fn, user_config, data);
 849                         found += 1;
 850                 }
 851                 free(user_config);
 852         }
 853
 854         if (repo_config && !access(repo_config, R_OK)) {
 855                 ret += git_config_from_file(fn, repo_config, data);
 856                 found += 1;
 857         }
 858
 859         switch (git_config_from_parameters(fn, data)) {
 860         case -1: /* error */
 861                 ret--;
 862                 break;
 863         case 0: /* found nothing */
 864                 break;
 865         default: /* found at least one item */
 866                 found++;
 867                 break;
 868         }
 869
 870         return ret == 0 ? found : ret;
 871 }
 872
 873 int git_config(config_fn_t fn, void *data)
 874 {
 875         char *repo_config = NULL;
 876         int ret;
 877
 878         repo_config = git_pathdup("config");
 879         ret = git_config_early(fn, data, repo_config);
 880         if (repo_config)
 881                 free(repo_config);
 882         return ret;
 883 }
 884
 885 /*
 886  * Find all the stuff for git_config_set() below.
 887  */
 888
 889 #define MAX_MATCHES 512
 890
 891 static struct {
 892         int baselen;
 893         char *key;
 894         int do_not_match;
 895         regex_t *value_regex;
 896         int multi_replace;
 897         size_t offset[MAX_MATCHES];
 898         enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 899         int seen;
 900 } store;
 901
 902 static int matches(const char *key, const char *value)
 903 {
 904         return !strcmp(key, store.key) &&
 905                 (store.value_regex == NULL ||
 906                  (store.do_not_match ^
 907                   !regexec(store.value_regex, value, 0, NULL, 0)));
 908 }
 909
 910 static int store_aux(const char *key, const char *value, void *cb)
 911 {
 912         const char *ep;
 913         size_t section_len;
 914
 915         switch (store.state) {
 916         case KEY_SEEN:
 917                 if (matches(key, value)) {
 918                         if (store.seen == 1 && store.multi_replace == 0) {
 919                                 warning("%s has multiple values", key);
 920                         } else if (store.seen >= MAX_MATCHES) {
 921                                 error("too many matches for %s", key);
 922                                 return 1;
 923                         }
 924
 925                         store.offset[store.seen] = ftell(config_file);
 926                         store.seen++;
 927                 }
 928                 break;
 929         case SECTION_SEEN:
 930                 /*
 931                  * What we are looking for is in store.key (both
 932                  * section and var), and its section part is baselen
 933                  * long.  We found key (again, both section and var).
 934                  * We would want to know if this key is in the same
 935                  * section as what we are looking for.  We already
 936                  * know we are in the same section as what should
 937                  * hold store.key.
 938                  */
 939                 ep = strrchr(key, '.');
 940                 section_len = ep - key;
 941
 942                 if ((section_len != store.baselen) ||
 943                     memcmp(key, store.key, section_len+1)) {
 944                         store.state = SECTION_END_SEEN;
 945                         break;
 946                 }
 947
 948                 /*
 949                  * Do not increment matches: this is no match, but we
 950                  * just made sure we are in the desired section.
 951                  */
 952                 store.offset[store.seen] = ftell(config_file);
 953                 /* fallthru */
 954         case SECTION_END_SEEN:
 955         case START:
 956                 if (matches(key, value)) {
 957                         store.offset[store.seen] = ftell(config_file);
 958                         store.state = KEY_SEEN;
 959                         store.seen++;
 960                 } else {
 961                         if (strrchr(key, '.') - key == store.baselen &&
 962                               !strncmp(key, store.key, store.baselen)) {
 963                                         store.state = SECTION_SEEN;
 964                                         store.offset[store.seen] = ftell(config_file);
 965                         }
 966                 }
 967         }
 968         return 0;
 969 }
 970
 971 static int write_error(const char *filename)
 972 {
 973         error("failed to write new configuration file %s", filename);
 974
 975         /* Same error code as "failed to rename". */
 976         return 4;
 977 }
 978
 979 static int store_write_section(int fd, const char *key)
 980 {
 981         const char *dot;
 982         int i, success;
 983         struct strbuf sb = STRBUF_INIT;
 984
 985         dot = memchr(key, '.', store.baselen);
 986         if (dot) {
 987                 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
 988                 for (i = dot - key + 1; i < store.baselen; i++) {
 989                         if (key[i] == '"' || key[i] == '\\')
 990                                 strbuf_addch(&sb, '\\');
 991                         strbuf_addch(&sb, key[i]);
 992                 }
 993                 strbuf_addstr(&sb, "\"]\n");
 994         } else {
 995                 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
 996         }
 997
 998         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
 999         strbuf_release(&sb);
1000
1001         return success;
1002 }
1003
1004 static int store_write_pair(int fd, const char *key, const char *value)
1005 {
1006         int i, success;
1007         int length = strlen(key + store.baselen + 1);
1008         const char *quote = "";
1009         struct strbuf sb = STRBUF_INIT;
1010
1011         /*
1012          * Check to see if the value needs to be surrounded with a dq pair.
1013          * Note that problematic characters are always backslash-quoted; this
1014          * check is about not losing leading or trailing SP and strings that
1015          * follow beginning-of-comment characters (i.e. ';' and '#') by the
1016          * configuration parser.
1017          */
1018         if (value[0] == ' ')
1019                 quote = "\"";
1020         for (i = 0; value[i]; i++)
1021                 if (value[i] == ';' || value[i] == '#')
1022                         quote = "\"";
1023         if (i && value[i - 1] == ' ')
1024                 quote = "\"";
1025
1026         strbuf_addf(&sb, "\t%.*s = %s",
1027                     length, key + store.baselen + 1, quote);
1028
1029         for (i = 0; value[i]; i++)
1030                 switch (value[i]) {
1031                 case '\n':
1032                         strbuf_addstr(&sb, "\\n");
1033                         break;
1034                 case '\t':
1035                         strbuf_addstr(&sb, "\\t");
1036                         break;
1037                 case '"':
1038                 case '\\':
1039                         strbuf_addch(&sb, '\\');
1040                 default:
1041                         strbuf_addch(&sb, value[i]);
1042                         break;
1043                 }
1044         strbuf_addf(&sb, "%s\n", quote);
1045
1046         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1047         strbuf_release(&sb);
1048
1049         return success;
1050 }
1051
1052 static ssize_t find_beginning_of_line(const char *contents, size_t size,
1053         size_t offset_, int *found_bracket)
1054 {
1055         size_t equal_offset = size, bracket_offset = size;
1056         ssize_t offset;
1057
1058 contline:
1059         for (offset = offset_-2; offset > 0
1060                         && contents[offset] != '\n'; offset--)
1061                 switch (contents[offset]) {
1062                         case '=': equal_offset = offset; break;
1063                         case ']': bracket_offset = offset; break;
1064                 }
1065         if (offset > 0 && contents[offset-1] == '\\') {
1066                 offset_ = offset;
1067                 goto contline;
1068         }
1069         if (bracket_offset < equal_offset) {
1070                 *found_bracket = 1;
1071                 offset = bracket_offset+1;
1072         } else
1073                 offset++;
1074
1075         return offset;
1076 }
1077
1078 int git_config_set(const char *key, const char *value)
1079 {
1080         return git_config_set_multivar(key, value, NULL, 0);
1081 }
1082
1083 /*
1084  * Auxiliary function to sanity-check and split the key into the section
1085  * identifier and variable name.
1086  *
1087  * Returns 0 on success, -1 when there is an invalid character in the key and
1088  * -2 if there is no section name in the key.
1089  *
1090  * store_key - pointer to char* which will hold a copy of the key with
1091  *             lowercase section and variable name
1092  * baselen - pointer to int which will hold the length of the
1093  *           section + subsection part, can be NULL
1094  */
1095 int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1096 {
1097         int i, dot, baselen;
1098         const char *last_dot = strrchr(key, '.');
1099
1100         /*
1101          * Since "key" actually contains the section name and the real
1102          * key name separated by a dot, we have to know where the dot is.
1103          */
1104
1105         if (last_dot == NULL || last_dot == key) {
1106                 error("key does not contain a section: %s", key);
1107                 return -2;
1108         }
1109
1110         if (!last_dot[1]) {
1111                 error("key does not contain variable name: %s", key);
1112                 return -2;
1113         }
1114
1115         baselen = last_dot - key;
1116         if (baselen_)
1117                 *baselen_ = baselen;
1118
1119         /*
1120          * Validate the key and while at it, lower case it for matching.
1121          */
1122         *store_key = xmalloc(strlen(key) + 1);
1123
1124         dot = 0;
1125         for (i = 0; key[i]; i++) {
1126                 unsigned char c = key[i];
1127                 if (c == '.')
1128                         dot = 1;
1129                 /* Leave the extended basename untouched.. */
1130                 if (!dot || i > baselen) {
1131                         if (!iskeychar(c) ||
1132                             (i == baselen + 1 && !isalpha(c))) {
1133                                 error("invalid key: %s", key);
1134                                 goto out_free_ret_1;
1135                         }
1136                         c = tolower(c);
1137                 } else if (c == '\n') {
1138                         error("invalid key (newline): %s", key);
1139                         goto out_free_ret_1;
1140                 }
1141                 (*store_key)[i] = c;
1142         }
1143         (*store_key)[i] = 0;
1144
1145         return 0;
1146
1147 out_free_ret_1:
1148         free(*store_key);
1149         return -1;
1150 }
1151
1152 /*
1153  * If value==NULL, unset in (remove from) config,
1154  * if value_regex!=NULL, disregard key/value pairs where value does not match.
1155  * if multi_replace==0, nothing, or only one matching key/value is replaced,
1156  *     else all matching key/values (regardless how many) are removed,
1157  *     before the new pair is written.
1158  *
1159  * Returns 0 on success.
1160  *
1161  * This function does this:
1162  *
1163  * - it locks the config file by creating ".git/config.lock"
1164  *
1165  * - it then parses the config using store_aux() as validator to find
1166  *   the position on the key/value pair to replace. If it is to be unset,
1167  *   it must be found exactly once.
1168  *
1169  * - the config file is mmap()ed and the part before the match (if any) is
1170  *   written to the lock file, then the changed part and the rest.
1171  *
1172  * - the config file is removed and the lock file rename()d to it.
1173  *
1174  */
1175 int git_config_set_multivar(const char *key, const char *value,
1176         const char *value_regex, int multi_replace)
1177 {
1178         int fd = -1, in_fd;
1179         int ret;
1180         char *config_filename;
1181         struct lock_file *lock = NULL;
1182
1183         if (config_exclusive_filename)
1184                 config_filename = xstrdup(config_exclusive_filename);
1185         else
1186                 config_filename = git_pathdup("config");
1187
1188         /* parse-key returns negative; flip the sign to feed exit(3) */
1189         ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1190         if (ret)
1191                 goto out_free;
1192
1193         store.multi_replace = multi_replace;
1194
1195
1196         /*
1197          * The lock serves a purpose in addition to locking: the new
1198          * contents of .git/config will be written into it.
1199          */
1200         lock = xcalloc(sizeof(struct lock_file), 1);
1201         fd = hold_lock_file_for_update(lock, config_filename, 0);
1202         if (fd < 0) {
1203                 error("could not lock config file %s: %s", config_filename, strerror(errno));
1204                 free(store.key);
1205                 ret = -1;
1206                 goto out_free;
1207         }
1208
1209         /*
1210          * If .git/config does not exist yet, write a minimal version.
1211          */
1212         in_fd = open(config_filename, O_RDONLY);
1213         if ( in_fd < 0 ) {
1214                 free(store.key);
1215
1216                 if ( ENOENT != errno ) {
1217                         error("opening %s: %s", config_filename,
1218                               strerror(errno));
1219                         ret = 3; /* same as "invalid config file" */
1220                         goto out_free;
1221                 }
1222                 /* if nothing to unset, error out */
1223                 if (value == NULL) {
1224                         ret = 5;
1225                         goto out_free;
1226                 }
1227
1228                 store.key = (char *)key;
1229                 if (!store_write_section(fd, key) ||
1230                     !store_write_pair(fd, key, value))
1231                         goto write_err_out;
1232         } else {
1233                 struct stat st;
1234                 char *contents;
1235                 size_t contents_sz, copy_begin, copy_end;
1236                 int i, new_line = 0;
1237
1238                 if (value_regex == NULL)
1239                         store.value_regex = NULL;
1240                 else {
1241                         if (value_regex[0] == '!') {
1242                                 store.do_not_match = 1;
1243                                 value_regex++;
1244                         } else
1245                                 store.do_not_match = 0;
1246
1247                         store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1248                         if (regcomp(store.value_regex, value_regex,
1249                                         REG_EXTENDED)) {
1250                                 error("invalid pattern: %s", value_regex);
1251                                 free(store.value_regex);
1252                                 ret = 6;
1253                                 goto out_free;
1254                         }
1255                 }
1256
1257                 store.offset[0] = 0;
1258                 store.state = START;
1259                 store.seen = 0;
1260
1261                 /*
1262                  * After this, store.offset will contain the *end* offset
1263                  * of the last match, or remain at 0 if no match was found.
1264                  * As a side effect, we make sure to transform only a valid
1265                  * existing config file.
1266                  */
1267                 if (git_config_from_file(store_aux, config_filename, NULL)) {
1268                         error("invalid config file %s", config_filename);
1269                         free(store.key);
1270                         if (store.value_regex != NULL) {
1271                                 regfree(store.value_regex);
1272                                 free(store.value_regex);
1273                         }
1274                         ret = 3;
1275                         goto out_free;
1276                 }
1277
1278                 free(store.key);
1279                 if (store.value_regex != NULL) {
1280                         regfree(store.value_regex);
1281                         free(store.value_regex);
1282                 }
1283
1284                 /* if nothing to unset, or too many matches, error out */
1285                 if ((store.seen == 0 && value == NULL) ||
1286                                 (store.seen > 1 && multi_replace == 0)) {
1287                         ret = 5;
1288                         goto out_free;
1289                 }
1290
1291                 fstat(in_fd, &st);
1292                 contents_sz = xsize_t(st.st_size);
1293                 contents = xmmap(NULL, contents_sz, PROT_READ,
1294                         MAP_PRIVATE, in_fd, 0);
1295                 close(in_fd);
1296
1297                 if (store.seen == 0)
1298                         store.seen = 1;
1299
1300                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1301                         if (store.offset[i] == 0) {
1302                                 store.offset[i] = copy_end = contents_sz;
1303                         } else if (store.state != KEY_SEEN) {
1304                                 copy_end = store.offset[i];
1305                         } else
1306                                 copy_end = find_beginning_of_line(
1307                                         contents, contents_sz,
1308                                         store.offset[i]-2, &new_line);
1309
1310                         if (copy_end > 0 && contents[copy_end-1] != '\n')
1311                                 new_line = 1;
1312
1313                         /* write the first part of the config */
1314                         if (copy_end > copy_begin) {
1315                                 if (write_in_full(fd, contents + copy_begin,
1316                                                   copy_end - copy_begin) <
1317                                     copy_end - copy_begin)
1318                                         goto write_err_out;
1319                                 if (new_line &&
1320                                     write_str_in_full(fd, "\n") != 1)
1321                                         goto write_err_out;
1322                         }
1323                         copy_begin = store.offset[i];
1324                 }
1325
1326                 /* write the pair (value == NULL means unset) */
1327                 if (value != NULL) {
1328                         if (store.state == START) {
1329                                 if (!store_write_section(fd, key))
1330                                         goto write_err_out;
1331                         }
1332                         if (!store_write_pair(fd, key, value))
1333                                 goto write_err_out;
1334                 }
1335
1336                 /* write the rest of the config */
1337                 if (copy_begin < contents_sz)
1338                         if (write_in_full(fd, contents + copy_begin,
1339                                           contents_sz - copy_begin) <
1340                             contents_sz - copy_begin)
1341                                 goto write_err_out;
1342
1343                 munmap(contents, contents_sz);
1344         }
1345
1346         if (commit_lock_file(lock) < 0) {
1347                 error("could not commit config file %s", config_filename);
1348                 ret = 4;
1349                 goto out_free;
1350         }
1351
1352         /*
1353          * lock is committed, so don't try to roll it back below.
1354          * NOTE: Since lockfile.c keeps a linked list of all created
1355          * lock_file structures, it isn't safe to free(lock).  It's
1356          * better to just leave it hanging around.
1357          */
1358         lock = NULL;
1359         ret = 0;
1360
1361 out_free:
1362         if (lock)
1363                 rollback_lock_file(lock);
1364         free(config_filename);
1365         return ret;
1366
1367 write_err_out:
1368         ret = write_error(lock->filename);
1369         goto out_free;
1370
1371 }
1372
1373 static int section_name_match (const char *buf, const char *name)
1374 {
1375         int i = 0, j = 0, dot = 0;
1376         if (buf[i] != '[')
1377                 return 0;
1378         for (i = 1; buf[i] && buf[i] != ']'; i++) {
1379                 if (!dot && isspace(buf[i])) {
1380                         dot = 1;
1381                         if (name[j++] != '.')
1382                                 break;
1383                         for (i++; isspace(buf[i]); i++)
1384                                 ; /* do nothing */
1385                         if (buf[i] != '"')
1386                                 break;
1387                         continue;
1388                 }
1389                 if (buf[i] == '\\' && dot)
1390                         i++;
1391                 else if (buf[i] == '"' && dot) {
1392                         for (i++; isspace(buf[i]); i++)
1393                                 ; /* do_nothing */
1394                         break;
1395                 }
1396                 if (buf[i] != name[j++])
1397                         break;
1398         }
1399         if (buf[i] == ']' && name[j] == 0) {
1400                 /*
1401                  * We match, now just find the right length offset by
1402                  * gobbling up any whitespace after it, as well
1403                  */
1404                 i++;
1405                 for (; buf[i] && isspace(buf[i]); i++)
1406                         ; /* do nothing */
1407                 return i;
1408         }
1409         return 0;
1410 }
1411
1412 /* if new_name == NULL, the section is removed instead */
1413 int git_config_rename_section(const char *old_name, const char *new_name)
1414 {
1415         int ret = 0, remove = 0;
1416         char *config_filename;
1417         struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1418         int out_fd;
1419         char buf[1024];
1420
1421         if (config_exclusive_filename)
1422                 config_filename = xstrdup(config_exclusive_filename);
1423         else
1424                 config_filename = git_pathdup("config");
1425         out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1426         if (out_fd < 0) {
1427                 ret = error("could not lock config file %s", config_filename);
1428                 goto out;
1429         }
1430
1431         if (!(config_file = fopen(config_filename, "rb"))) {
1432                 /* no config file means nothing to rename, no error */
1433                 goto unlock_and_out;
1434         }
1435
1436         while (fgets(buf, sizeof(buf), config_file)) {
1437                 int i;
1438                 int length;
1439                 char *output = buf;
1440                 for (i = 0; buf[i] && isspace(buf[i]); i++)
1441                         ; /* do nothing */
1442                 if (buf[i] == '[') {
1443                         /* it's a section */
1444                         int offset = section_name_match(&buf[i], old_name);
1445                         if (offset > 0) {
1446                                 ret++;
1447                                 if (new_name == NULL) {
1448                                         remove = 1;
1449                                         continue;
1450                                 }
1451                                 store.baselen = strlen(new_name);
1452                                 if (!store_write_section(out_fd, new_name)) {
1453                                         ret = write_error(lock->filename);
1454                                         goto out;
1455                                 }
1456                                 /*
1457                                  * We wrote out the new section, with
1458                                  * a newline, now skip the old
1459                                  * section's length
1460                                  */
1461                                 output += offset + i;
1462                                 if (strlen(output) > 0) {
1463                                         /*
1464                                          * More content means there's
1465                                          * a declaration to put on the
1466                                          * next line; indent with a
1467                                          * tab
1468                                          */
1469                                         output -= 1;
1470                                         output[0] = '\t';
1471                                 }
1472                         }
1473                         remove = 0;
1474                 }
1475                 if (remove)
1476                         continue;
1477                 length = strlen(output);
1478                 if (write_in_full(out_fd, output, length) != length) {
1479                         ret = write_error(lock->filename);
1480                         goto out;
1481                 }
1482         }
1483         fclose(config_file);
1484  unlock_and_out:
1485         if (commit_lock_file(lock) < 0)
1486                 ret = error("could not commit config file %s", config_filename);
1487  out:
1488         free(config_filename);
1489         return ret;
1490 }
1491
1492 /*
1493  * Call this to report error for your variable that should not
1494  * get a boolean value (i.e. "[my] var" means "true").
1495  */
1496 int config_error_nonbool(const char *var)
1497 {
1498         return error("Missing value for '%s'", var);
1499 }