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         struct config_item *next;
  25         char *name;
  26         char *value;
  27 };
  28 static struct config_item *config_parameters;
  29 static struct config_item **config_parameters_tail = &config_parameters;
  30
  31 static void lowercase(char *p)
  32 {
  33         for (; *p; p++)
  34                 *p = tolower(*p);
  35 }
  36
  37 void git_config_push_parameter(const char *text)
  38 {
  39         struct strbuf env = STRBUF_INIT;
  40         const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
  41         if (old) {
  42                 strbuf_addstr(&env, old);
  43                 strbuf_addch(&env, ' ');
  44         }
  45         sq_quote_buf(&env, text);
  46         setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
  47         strbuf_release(&env);
  48 }
  49
  50 int git_config_parse_parameter(const char *text)
  51 {
  52         struct config_item *ct;
  53         struct strbuf tmp = STRBUF_INIT;
  54         struct strbuf **pair;
  55         strbuf_addstr(&tmp, text);
  56         pair = strbuf_split(&tmp, '=');
  57         if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
  58                 strbuf_setlen(pair[0], pair[0]->len - 1);
  59         strbuf_trim(pair[0]);
  60         if (!pair[0]->len) {
  61                 strbuf_list_free(pair);
  62                 return -1;
  63         }
  64         ct = xcalloc(1, sizeof(struct config_item));
  65         ct->name = strbuf_detach(pair[0], NULL);
  66         if (pair[1]) {
  67                 strbuf_trim(pair[1]);
  68                 ct->value = strbuf_detach(pair[1], NULL);
  69         }
  70         strbuf_list_free(pair);
  71         lowercase(ct->name);
  72         *config_parameters_tail = ct;
  73         config_parameters_tail = &ct->next;
  74         return 0;
  75 }
  76
  77 int git_config_parse_environment(void) {
  78         const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
  79         char *envw;
  80         const char **argv = NULL;
  81         int nr = 0, alloc = 0;
  82         int i;
  83
  84         if (!env)
  85                 return 0;
  86         /* sq_dequote will write over it */
  87         envw = xstrdup(env);
  88
  89         if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
  90                 free(envw);
  91                 return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
  92         }
  93
  94         for (i = 0; i < nr; i++) {
  95                 if (git_config_parse_parameter(argv[i]) < 0) {
  96                         error("bogus config parameter: %s", argv[i]);
  97                         free(argv);
  98                         free(envw);
  99                         return -1;
 100                 }
 101         }
 102
 103         free(argv);
 104         free(envw);
 105         return 0;
 106 }
 107
 108 static int get_next_char(void)
 109 {
 110         int c;
 111         FILE *f;
 112
 113         c = '\n';
 114         if ((f = config_file) != NULL) {
 115                 c = fgetc(f);
 116                 if (c == '\r') {
 117                         /* DOS like systems */
 118                         c = fgetc(f);
 119                         if (c != '\n') {
 120                                 ungetc(c, f);
 121                                 c = '\r';
 122                         }
 123                 }
 124                 if (c == '\n')
 125                         config_linenr++;
 126                 if (c == EOF) {
 127                         config_file_eof = 1;
 128                         c = '\n';
 129                 }
 130         }
 131         return c;
 132 }
 133
 134 static char *parse_value(void)
 135 {
 136         static struct strbuf value = STRBUF_INIT;
 137         int quote = 0, comment = 0, space = 0;
 138
 139         strbuf_reset(&value);
 140         for (;;) {
 141                 int c = get_next_char();
 142                 if (c == '\n') {
 143                         if (quote)
 144                                 return NULL;
 145                         return value.buf;
 146                 }
 147                 if (comment)
 148                         continue;
 149                 if (isspace(c) && !quote) {
 150                         if (value.len)
 151                                 space++;
 152                         continue;
 153                 }
 154                 if (!quote) {
 155                         if (c == ';' || c == '#') {
 156                                 comment = 1;
 157                                 continue;
 158                         }
 159                 }
 160                 for (; space; space--)
 161                         strbuf_addch(&value, ' ');
 162                 if (c == '\\') {
 163                         c = get_next_char();
 164                         switch (c) {
 165                         case '\n':
 166                                 continue;
 167                         case 't':
 168                                 c = '\t';
 169                                 break;
 170                         case 'b':
 171                                 c = '\b';
 172                                 break;
 173                         case 'n':
 174                                 c = '\n';
 175                                 break;
 176                         /* Some characters escape as themselves */
 177                         case '\\': case '"':
 178                                 break;
 179                         /* Reject unknown escape sequences */
 180                         default:
 181                                 return NULL;
 182                         }
 183                         strbuf_addch(&value, c);
 184                         continue;
 185                 }
 186                 if (c == '"') {
 187                         quote = 1-quote;
 188                         continue;
 189                 }
 190                 strbuf_addch(&value, c);
 191         }
 192 }
 193
 194 static inline int iskeychar(int c)
 195 {
 196         return isalnum(c) || c == '-';
 197 }
 198
 199 static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
 200 {
 201         int c;
 202         char *value;
 203
 204         /* Get the full name */
 205         for (;;) {
 206                 c = get_next_char();
 207                 if (config_file_eof)
 208                         break;
 209                 if (!iskeychar(c))
 210                         break;
 211                 name[len++] = tolower(c);
 212                 if (len >= MAXNAME)
 213                         return -1;
 214         }
 215         name[len] = 0;
 216         while (c == ' ' || c == '\t')
 217                 c = get_next_char();
 218
 219         value = NULL;
 220         if (c != '\n') {
 221                 if (c != '=')
 222                         return -1;
 223                 value = parse_value();
 224                 if (!value)
 225                         return -1;
 226         }
 227         return fn(name, value, data);
 228 }
 229
 230 static int get_extended_base_var(char *name, int baselen, int c)
 231 {
 232         do {
 233                 if (c == '\n')
 234                         return -1;
 235                 c = get_next_char();
 236         } while (isspace(c));
 237
 238         /* We require the format to be '[base "extension"]' */
 239         if (c != '"')
 240                 return -1;
 241         name[baselen++] = '.';
 242
 243         for (;;) {
 244                 int c = get_next_char();
 245                 if (c == '\n')
 246                         return -1;
 247                 if (c == '"')
 248                         break;
 249                 if (c == '\\') {
 250                         c = get_next_char();
 251                         if (c == '\n')
 252                                 return -1;
 253                 }
 254                 name[baselen++] = c;
 255                 if (baselen > MAXNAME / 2)
 256                         return -1;
 257         }
 258
 259         /* Final ']' */
 260         if (get_next_char() != ']')
 261                 return -1;
 262         return baselen;
 263 }
 264
 265 static int get_base_var(char *name)
 266 {
 267         int baselen = 0;
 268
 269         for (;;) {
 270                 int c = get_next_char();
 271                 if (config_file_eof)
 272                         return -1;
 273                 if (c == ']')
 274                         return baselen;
 275                 if (isspace(c))
 276                         return get_extended_base_var(name, baselen, c);
 277                 if (!iskeychar(c) && c != '.')
 278                         return -1;
 279                 if (baselen > MAXNAME / 2)
 280                         return -1;
 281                 name[baselen++] = tolower(c);
 282         }
 283 }
 284
 285 static int git_parse_file(config_fn_t fn, void *data)
 286 {
 287         int comment = 0;
 288         int baselen = 0;
 289         static char var[MAXNAME];
 290
 291         /* U+FEFF Byte Order Mark in UTF8 */
 292         static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 293         const unsigned char *bomptr = utf8_bom;
 294
 295         for (;;) {
 296                 int c = get_next_char();
 297                 if (bomptr && *bomptr) {
 298                         /* We are at the file beginning; skip UTF8-encoded BOM
 299                          * if present. Sane editors won't put this in on their
 300                          * own, but e.g. Windows Notepad will do it happily. */
 301                         if ((unsigned char) c == *bomptr) {
 302                                 bomptr++;
 303                                 continue;
 304                         } else {
 305                                 /* Do not tolerate partial BOM. */
 306                                 if (bomptr != utf8_bom)
 307                                         break;
 308                                 /* No BOM at file beginning. Cool. */
 309                                 bomptr = NULL;
 310                         }
 311                 }
 312                 if (c == '\n') {
 313                         if (config_file_eof)
 314                                 return 0;
 315                         comment = 0;
 316                         continue;
 317                 }
 318                 if (comment || isspace(c))
 319                         continue;
 320                 if (c == '#' || c == ';') {
 321                         comment = 1;
 322                         continue;
 323                 }
 324                 if (c == '[') {
 325                         baselen = get_base_var(var);
 326                         if (baselen <= 0)
 327                                 break;
 328                         var[baselen++] = '.';
 329                         var[baselen] = 0;
 330                         continue;
 331                 }
 332                 if (!isalpha(c))
 333                         break;
 334                 var[baselen] = tolower(c);
 335                 if (get_value(fn, data, var, baselen+1) < 0)
 336                         break;
 337         }
 338         die("bad config file line %d in %s", config_linenr, config_file_name);
 339 }
 340
 341 static int parse_unit_factor(const char *end, unsigned long *val)
 342 {
 343         if (!*end)
 344                 return 1;
 345         else if (!strcasecmp(end, "k")) {
 346                 *val *= 1024;
 347                 return 1;
 348         }
 349         else if (!strcasecmp(end, "m")) {
 350                 *val *= 1024 * 1024;
 351                 return 1;
 352         }
 353         else if (!strcasecmp(end, "g")) {
 354                 *val *= 1024 * 1024 * 1024;
 355                 return 1;
 356         }
 357         return 0;
 358 }
 359
 360 static int git_parse_long(const char *value, long *ret)
 361 {
 362         if (value && *value) {
 363                 char *end;
 364                 long val = strtol(value, &end, 0);
 365                 unsigned long factor = 1;
 366                 if (!parse_unit_factor(end, &factor))
 367                         return 0;
 368                 *ret = val * factor;
 369                 return 1;
 370         }
 371         return 0;
 372 }
 373
 374 int git_parse_ulong(const char *value, unsigned long *ret)
 375 {
 376         if (value && *value) {
 377                 char *end;
 378                 unsigned long val = strtoul(value, &end, 0);
 379                 if (!parse_unit_factor(end, &val))
 380                         return 0;
 381                 *ret = val;
 382                 return 1;
 383         }
 384         return 0;
 385 }
 386
 387 static void die_bad_config(const char *name)
 388 {
 389         if (config_file_name)
 390                 die("bad config value for '%s' in %s", name, config_file_name);
 391         die("bad config value for '%s'", name);
 392 }
 393
 394 int git_config_int(const char *name, const char *value)
 395 {
 396         long ret = 0;
 397         if (!git_parse_long(value, &ret))
 398                 die_bad_config(name);
 399         return ret;
 400 }
 401
 402 unsigned long git_config_ulong(const char *name, const char *value)
 403 {
 404         unsigned long ret;
 405         if (!git_parse_ulong(value, &ret))
 406                 die_bad_config(name);
 407         return ret;
 408 }
 409
 410 static int git_config_maybe_bool_text(const char *name, const char *value)
 411 {
 412         if (!value)
 413                 return 1;
 414         if (!*value)
 415                 return 0;
 416         if (!strcasecmp(value, "true")
 417             || !strcasecmp(value, "yes")
 418             || !strcasecmp(value, "on"))
 419                 return 1;
 420         if (!strcasecmp(value, "false")
 421             || !strcasecmp(value, "no")
 422             || !strcasecmp(value, "off"))
 423                 return 0;
 424         return -1;
 425 }
 426
 427 int git_config_maybe_bool(const char *name, const char *value)
 428 {
 429         long v = git_config_maybe_bool_text(name, value);
 430         if (0 <= v)
 431                 return v;
 432         if (git_parse_long(value, &v))
 433                 return !!v;
 434         return -1;
 435 }
 436
 437 int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 438 {
 439         int v = git_config_maybe_bool_text(name, value);
 440         if (0 <= v) {
 441                 *is_bool = 1;
 442                 return v;
 443         }
 444         *is_bool = 0;
 445         return git_config_int(name, value);
 446 }
 447
 448 int git_config_bool(const char *name, const char *value)
 449 {
 450         int discard;
 451         return !!git_config_bool_or_int(name, value, &discard);
 452 }
 453
 454 int git_config_string(const char **dest, const char *var, const char *value)
 455 {
 456         if (!value)
 457                 return config_error_nonbool(var);
 458         *dest = xstrdup(value);
 459         return 0;
 460 }
 461
 462 int git_config_pathname(const char **dest, const char *var, const char *value)
 463 {
 464         if (!value)
 465                 return config_error_nonbool(var);
 466         *dest = expand_user_path(value);
 467         if (!*dest)
 468                 die("Failed to expand user dir in: '%s'", value);
 469         return 0;
 470 }
 471
 472 static int git_default_core_config(const char *var, const char *value)
 473 {
 474         /* This needs a better name */
 475         if (!strcmp(var, "core.filemode")) {
 476                 trust_executable_bit = git_config_bool(var, value);
 477                 return 0;
 478         }
 479         if (!strcmp(var, "core.trustctime")) {
 480                 trust_ctime = git_config_bool(var, value);
 481                 return 0;
 482         }
 483
 484         if (!strcmp(var, "core.quotepath")) {
 485                 quote_path_fully = git_config_bool(var, value);
 486                 return 0;
 487         }
 488
 489         if (!strcmp(var, "core.symlinks")) {
 490                 has_symlinks = git_config_bool(var, value);
 491                 return 0;
 492         }
 493
 494         if (!strcmp(var, "core.ignorecase")) {
 495                 ignore_case = git_config_bool(var, value);
 496                 return 0;
 497         }
 498
 499         if (!strcmp(var, "core.bare")) {
 500                 is_bare_repository_cfg = git_config_bool(var, value);
 501                 return 0;
 502         }
 503
 504         if (!strcmp(var, "core.ignorestat")) {
 505                 assume_unchanged = git_config_bool(var, value);
 506                 return 0;
 507         }
 508
 509         if (!strcmp(var, "core.prefersymlinkrefs")) {
 510                 prefer_symlink_refs = git_config_bool(var, value);
 511                 return 0;
 512         }
 513
 514         if (!strcmp(var, "core.logallrefupdates")) {
 515                 log_all_ref_updates = git_config_bool(var, value);
 516                 return 0;
 517         }
 518
 519         if (!strcmp(var, "core.warnambiguousrefs")) {
 520                 warn_ambiguous_refs = git_config_bool(var, value);
 521                 return 0;
 522         }
 523
 524         if (!strcmp(var, "core.abbrev")) {
 525                 int abbrev = git_config_int(var, value);
 526                 if (abbrev < minimum_abbrev || abbrev > 40)
 527                         return -1;
 528                 default_abbrev = abbrev;
 529                 return 0;
 530         }
 531
 532         if (!strcmp(var, "core.loosecompression")) {
 533                 int level = git_config_int(var, value);
 534                 if (level == -1)
 535                         level = Z_DEFAULT_COMPRESSION;
 536                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 537                         die("bad zlib compression level %d", level);
 538                 zlib_compression_level = level;
 539                 zlib_compression_seen = 1;
 540                 return 0;
 541         }
 542
 543         if (!strcmp(var, "core.compression")) {
 544                 int level = git_config_int(var, value);
 545                 if (level == -1)
 546                         level = Z_DEFAULT_COMPRESSION;
 547                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 548                         die("bad zlib compression level %d", level);
 549                 core_compression_level = level;
 550                 core_compression_seen = 1;
 551                 if (!zlib_compression_seen)
 552                         zlib_compression_level = level;
 553                 return 0;
 554         }
 555
 556         if (!strcmp(var, "core.packedgitwindowsize")) {
 557                 int pgsz_x2 = getpagesize() * 2;
 558                 packed_git_window_size = git_config_int(var, value);
 559
 560                 /* This value must be multiple of (pagesize * 2) */
 561                 packed_git_window_size /= pgsz_x2;
 562                 if (packed_git_window_size < 1)
 563                         packed_git_window_size = 1;
 564                 packed_git_window_size *= pgsz_x2;
 565                 return 0;
 566         }
 567
 568         if (!strcmp(var, "core.bigfilethreshold")) {
 569                 long n = git_config_int(var, value);
 570                 big_file_threshold = 0 < n ? n : 0;
 571                 return 0;
 572         }
 573
 574         if (!strcmp(var, "core.packedgitlimit")) {
 575                 packed_git_limit = git_config_int(var, value);
 576                 return 0;
 577         }
 578
 579         if (!strcmp(var, "core.deltabasecachelimit")) {
 580                 delta_base_cache_limit = git_config_int(var, value);
 581                 return 0;
 582         }
 583
 584         if (!strcmp(var, "core.autocrlf")) {
 585                 if (value && !strcasecmp(value, "input")) {
 586                         if (eol == EOL_CRLF)
 587                                 return error("core.autocrlf=input conflicts with core.eol=crlf");
 588                         auto_crlf = AUTO_CRLF_INPUT;
 589                         return 0;
 590                 }
 591                 auto_crlf = git_config_bool(var, value);
 592                 return 0;
 593         }
 594
 595         if (!strcmp(var, "core.safecrlf")) {
 596                 if (value && !strcasecmp(value, "warn")) {
 597                         safe_crlf = SAFE_CRLF_WARN;
 598                         return 0;
 599                 }
 600                 safe_crlf = git_config_bool(var, value);
 601                 return 0;
 602         }
 603
 604         if (!strcmp(var, "core.eol")) {
 605                 if (value && !strcasecmp(value, "lf"))
 606                         eol = EOL_LF;
 607                 else if (value && !strcasecmp(value, "crlf"))
 608                         eol = EOL_CRLF;
 609                 else if (value && !strcasecmp(value, "native"))
 610                         eol = EOL_NATIVE;
 611                 else
 612                         eol = EOL_UNSET;
 613                 if (eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 614                         return error("core.autocrlf=input conflicts with core.eol=crlf");
 615                 return 0;
 616         }
 617
 618         if (!strcmp(var, "core.notesref")) {
 619                 notes_ref_name = xstrdup(value);
 620                 return 0;
 621         }
 622
 623         if (!strcmp(var, "core.pager"))
 624                 return git_config_string(&pager_program, var, value);
 625
 626         if (!strcmp(var, "core.editor"))
 627                 return git_config_string(&editor_program, var, value);
 628
 629         if (!strcmp(var, "core.askpass"))
 630                 return git_config_string(&askpass_program, var, value);
 631
 632         if (!strcmp(var, "core.excludesfile"))
 633                 return git_config_pathname(&excludes_file, var, value);
 634
 635         if (!strcmp(var, "core.whitespace")) {
 636                 if (!value)
 637                         return config_error_nonbool(var);
 638                 whitespace_rule_cfg = parse_whitespace_rule(value);
 639                 return 0;
 640         }
 641
 642         if (!strcmp(var, "core.fsyncobjectfiles")) {
 643                 fsync_object_files = git_config_bool(var, value);
 644                 return 0;
 645         }
 646
 647         if (!strcmp(var, "core.preloadindex")) {
 648                 core_preload_index = git_config_bool(var, value);
 649                 return 0;
 650         }
 651
 652         if (!strcmp(var, "core.createobject")) {
 653                 if (!strcmp(value, "rename"))
 654                         object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 655                 else if (!strcmp(value, "link"))
 656                         object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 657                 else
 658                         die("Invalid mode for object creation: %s", value);
 659                 return 0;
 660         }
 661
 662         if (!strcmp(var, "core.sparsecheckout")) {
 663                 core_apply_sparse_checkout = git_config_bool(var, value);
 664                 return 0;
 665         }
 666
 667         /* Add other config variables here and to Documentation/config.txt. */
 668         return 0;
 669 }
 670
 671 static int git_default_user_config(const char *var, const char *value)
 672 {
 673         if (!strcmp(var, "user.name")) {
 674                 if (!value)
 675                         return config_error_nonbool(var);
 676                 strlcpy(git_default_name, value, sizeof(git_default_name));
 677                 user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 678                 return 0;
 679         }
 680
 681         if (!strcmp(var, "user.email")) {
 682                 if (!value)
 683                         return config_error_nonbool(var);
 684                 strlcpy(git_default_email, value, sizeof(git_default_email));
 685                 user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 686                 return 0;
 687         }
 688
 689         /* Add other config variables here and to Documentation/config.txt. */
 690         return 0;
 691 }
 692
 693 static int git_default_i18n_config(const char *var, const char *value)
 694 {
 695         if (!strcmp(var, "i18n.commitencoding"))
 696                 return git_config_string(&git_commit_encoding, var, value);
 697
 698         if (!strcmp(var, "i18n.logoutputencoding"))
 699                 return git_config_string(&git_log_output_encoding, var, value);
 700
 701         /* Add other config variables here and to Documentation/config.txt. */
 702         return 0;
 703 }
 704
 705 static int git_default_branch_config(const char *var, const char *value)
 706 {
 707         if (!strcmp(var, "branch.autosetupmerge")) {
 708                 if (value && !strcasecmp(value, "always")) {
 709                         git_branch_track = BRANCH_TRACK_ALWAYS;
 710                         return 0;
 711                 }
 712                 git_branch_track = git_config_bool(var, value);
 713                 return 0;
 714         }
 715         if (!strcmp(var, "branch.autosetuprebase")) {
 716                 if (!value)
 717                         return config_error_nonbool(var);
 718                 else if (!strcmp(value, "never"))
 719                         autorebase = AUTOREBASE_NEVER;
 720                 else if (!strcmp(value, "local"))
 721                         autorebase = AUTOREBASE_LOCAL;
 722                 else if (!strcmp(value, "remote"))
 723                         autorebase = AUTOREBASE_REMOTE;
 724                 else if (!strcmp(value, "always"))
 725                         autorebase = AUTOREBASE_ALWAYS;
 726                 else
 727                         return error("Malformed value for %s", var);
 728                 return 0;
 729         }
 730
 731         /* Add other config variables here and to Documentation/config.txt. */
 732         return 0;
 733 }
 734
 735 static int git_default_push_config(const char *var, const char *value)
 736 {
 737         if (!strcmp(var, "push.default")) {
 738                 if (!value)
 739                         return config_error_nonbool(var);
 740                 else if (!strcmp(value, "nothing"))
 741                         push_default = PUSH_DEFAULT_NOTHING;
 742                 else if (!strcmp(value, "matching"))
 743                         push_default = PUSH_DEFAULT_MATCHING;
 744                 else if (!strcmp(value, "upstream"))
 745                         push_default = PUSH_DEFAULT_UPSTREAM;
 746                 else if (!strcmp(value, "tracking")) /* deprecated */
 747                         push_default = PUSH_DEFAULT_UPSTREAM;
 748                 else if (!strcmp(value, "current"))
 749                         push_default = PUSH_DEFAULT_CURRENT;
 750                 else {
 751                         error("Malformed value for %s: %s", var, value);
 752                         return error("Must be one of nothing, matching, "
 753                                      "tracking or current.");
 754                 }
 755                 return 0;
 756         }
 757
 758         /* Add other config variables here and to Documentation/config.txt. */
 759         return 0;
 760 }
 761
 762 static int git_default_mailmap_config(const char *var, const char *value)
 763 {
 764         if (!strcmp(var, "mailmap.file"))
 765                 return git_config_string(&git_mailmap_file, var, value);
 766
 767         /* Add other config variables here and to Documentation/config.txt. */
 768         return 0;
 769 }
 770
 771 int git_default_config(const char *var, const char *value, void *dummy)
 772 {
 773         if (!prefixcmp(var, "core."))
 774                 return git_default_core_config(var, value);
 775
 776         if (!prefixcmp(var, "user."))
 777                 return git_default_user_config(var, value);
 778
 779         if (!prefixcmp(var, "i18n."))
 780                 return git_default_i18n_config(var, value);
 781
 782         if (!prefixcmp(var, "branch."))
 783                 return git_default_branch_config(var, value);
 784
 785         if (!prefixcmp(var, "push."))
 786                 return git_default_push_config(var, value);
 787
 788         if (!prefixcmp(var, "mailmap."))
 789                 return git_default_mailmap_config(var, value);
 790
 791         if (!prefixcmp(var, "advice."))
 792                 return git_default_advice_config(var, value);
 793
 794         if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 795                 pager_use_color = git_config_bool(var,value);
 796                 return 0;
 797         }
 798
 799         /* Add other config variables here and to Documentation/config.txt. */
 800         return 0;
 801 }
 802
 803 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 804 {
 805         int ret;
 806         FILE *f = fopen(filename, "r");
 807
 808         ret = -1;
 809         if (f) {
 810                 config_file = f;
 811                 config_file_name = filename;
 812                 config_linenr = 1;
 813                 config_file_eof = 0;
 814                 ret = git_parse_file(fn, data);
 815                 fclose(f);
 816                 config_file_name = NULL;
 817         }
 818         return ret;
 819 }
 820
 821 const char *git_etc_gitconfig(void)
 822 {
 823         static const char *system_wide;
 824         if (!system_wide)
 825                 system_wide = system_path(ETC_GITCONFIG);
 826         return system_wide;
 827 }
 828
 829 int git_env_bool(const char *k, int def)
 830 {
 831         const char *v = getenv(k);
 832         return v ? git_config_bool(k, v) : def;
 833 }
 834
 835 int git_config_system(void)
 836 {
 837         return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 838 }
 839
 840 int git_config_from_parameters(config_fn_t fn, void *data)
 841 {
 842         static int loaded_environment;
 843         const struct config_item *ct;
 844
 845         if (!loaded_environment) {
 846                 if (git_config_parse_environment() < 0)
 847                         return -1;
 848                 loaded_environment = 1;
 849         }
 850         for (ct = config_parameters; ct; ct = ct->next)
 851                 if (fn(ct->name, ct->value, data) < 0)
 852                         return -1;
 853         return 0;
 854 }
 855
 856 int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 857 {
 858         int ret = 0, found = 0;
 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 (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         if (repo_config && !access(repo_config, R_OK)) {
 881                 ret += git_config_from_file(fn, repo_config, data);
 882                 found += 1;
 883         }
 884
 885         ret += git_config_from_parameters(fn, data);
 886         if (config_parameters)
 887                 found += 1;
 888
 889         return ret == 0 ? found : ret;
 890 }
 891
 892 int git_config(config_fn_t fn, void *data)
 893 {
 894         char *repo_config = NULL;
 895         int ret;
 896
 897         repo_config = git_pathdup("config");
 898         ret = git_config_early(fn, data, repo_config);
 899         if (repo_config)
 900                 free(repo_config);
 901         return ret;
 902 }
 903
 904 /*
 905  * Find all the stuff for git_config_set() below.
 906  */
 907
 908 #define MAX_MATCHES 512
 909
 910 static struct {
 911         int baselen;
 912         char *key;
 913         int do_not_match;
 914         regex_t *value_regex;
 915         int multi_replace;
 916         size_t offset[MAX_MATCHES];
 917         enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 918         int seen;
 919 } store;
 920
 921 static int matches(const char *key, const char *value)
 922 {
 923         return !strcmp(key, store.key) &&
 924                 (store.value_regex == NULL ||
 925                  (store.do_not_match ^
 926                   !regexec(store.value_regex, value, 0, NULL, 0)));
 927 }
 928
 929 static int store_aux(const char *key, const char *value, void *cb)
 930 {
 931         const char *ep;
 932         size_t section_len;
 933
 934         switch (store.state) {
 935         case KEY_SEEN:
 936                 if (matches(key, value)) {
 937                         if (store.seen == 1 && store.multi_replace == 0) {
 938                                 warning("%s has multiple values", key);
 939                         } else if (store.seen >= MAX_MATCHES) {
 940                                 error("too many matches for %s", key);
 941                                 return 1;
 942                         }
 943
 944                         store.offset[store.seen] = ftell(config_file);
 945                         store.seen++;
 946                 }
 947                 break;
 948         case SECTION_SEEN:
 949                 /*
 950                  * What we are looking for is in store.key (both
 951                  * section and var), and its section part is baselen
 952                  * long.  We found key (again, both section and var).
 953                  * We would want to know if this key is in the same
 954                  * section as what we are looking for.  We already
 955                  * know we are in the same section as what should
 956                  * hold store.key.
 957                  */
 958                 ep = strrchr(key, '.');
 959                 section_len = ep - key;
 960
 961                 if ((section_len != store.baselen) ||
 962                     memcmp(key, store.key, section_len+1)) {
 963                         store.state = SECTION_END_SEEN;
 964                         break;
 965                 }
 966
 967                 /*
 968                  * Do not increment matches: this is no match, but we
 969                  * just made sure we are in the desired section.
 970                  */
 971                 store.offset[store.seen] = ftell(config_file);
 972                 /* fallthru */
 973         case SECTION_END_SEEN:
 974         case START:
 975                 if (matches(key, value)) {
 976                         store.offset[store.seen] = ftell(config_file);
 977                         store.state = KEY_SEEN;
 978                         store.seen++;
 979                 } else {
 980                         if (strrchr(key, '.') - key == store.baselen &&
 981                               !strncmp(key, store.key, store.baselen)) {
 982                                         store.state = SECTION_SEEN;
 983                                         store.offset[store.seen] = ftell(config_file);
 984                         }
 985                 }
 986         }
 987         return 0;
 988 }
 989
 990 static int write_error(const char *filename)
 991 {
 992         error("failed to write new configuration file %s", filename);
 993
 994         /* Same error code as "failed to rename". */
 995         return 4;
 996 }
 997
 998 static int store_write_section(int fd, const char *key)
 999 {
1000         const char *dot;
1001         int i, success;
1002         struct strbuf sb = STRBUF_INIT;
1003
1004         dot = memchr(key, '.', store.baselen);
1005         if (dot) {
1006                 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1007                 for (i = dot - key + 1; i < store.baselen; i++) {
1008                         if (key[i] == '"' || key[i] == '\\')
1009                                 strbuf_addch(&sb, '\\');
1010                         strbuf_addch(&sb, key[i]);
1011                 }
1012                 strbuf_addstr(&sb, "\"]\n");
1013         } else {
1014                 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1015         }
1016
1017         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1018         strbuf_release(&sb);
1019
1020         return success;
1021 }
1022
1023 static int store_write_pair(int fd, const char *key, const char *value)
1024 {
1025         int i, success;
1026         int length = strlen(key + store.baselen + 1);
1027         const char *quote = "";
1028         struct strbuf sb = STRBUF_INIT;
1029
1030         /*
1031          * Check to see if the value needs to be surrounded with a dq pair.
1032          * Note that problematic characters are always backslash-quoted; this
1033          * check is about not losing leading or trailing SP and strings that
1034          * follow beginning-of-comment characters (i.e. ';' and '#') by the
1035          * configuration parser.
1036          */
1037         if (value[0] == ' ')
1038                 quote = "\"";
1039         for (i = 0; value[i]; i++)
1040                 if (value[i] == ';' || value[i] == '#')
1041                         quote = "\"";
1042         if (i && value[i - 1] == ' ')
1043                 quote = "\"";
1044
1045         strbuf_addf(&sb, "\t%.*s = %s",
1046                     length, key + store.baselen + 1, quote);
1047
1048         for (i = 0; value[i]; i++)
1049                 switch (value[i]) {
1050                 case '\n':
1051                         strbuf_addstr(&sb, "\\n");
1052                         break;
1053                 case '\t':
1054                         strbuf_addstr(&sb, "\\t");
1055                         break;
1056                 case '"':
1057                 case '\\':
1058                         strbuf_addch(&sb, '\\');
1059                 default:
1060                         strbuf_addch(&sb, value[i]);
1061                         break;
1062                 }
1063         strbuf_addf(&sb, "%s\n", quote);
1064
1065         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1066         strbuf_release(&sb);
1067
1068         return success;
1069 }
1070
1071 static ssize_t find_beginning_of_line(const char *contents, size_t size,
1072         size_t offset_, int *found_bracket)
1073 {
1074         size_t equal_offset = size, bracket_offset = size;
1075         ssize_t offset;
1076
1077 contline:
1078         for (offset = offset_-2; offset > 0
1079                         && contents[offset] != '\n'; offset--)
1080                 switch (contents[offset]) {
1081                         case '=': equal_offset = offset; break;
1082                         case ']': bracket_offset = offset; break;
1083                 }
1084         if (offset > 0 && contents[offset-1] == '\\') {
1085                 offset_ = offset;
1086                 goto contline;
1087         }
1088         if (bracket_offset < equal_offset) {
1089                 *found_bracket = 1;
1090                 offset = bracket_offset+1;
1091         } else
1092                 offset++;
1093
1094         return offset;
1095 }
1096
1097 int git_config_set(const char *key, const char *value)
1098 {
1099         return git_config_set_multivar(key, value, NULL, 0);
1100 }
1101
1102 /*
1103  * Auxiliary function to sanity-check and split the key into the section
1104  * identifier and variable name.
1105  *
1106  * Returns 0 on success, -1 when there is an invalid character in the key and
1107  * -2 if there is no section name in the key.
1108  *
1109  * store_key - pointer to char* which will hold a copy of the key with
1110  *             lowercase section and variable name
1111  * baselen - pointer to int which will hold the length of the
1112  *           section + subsection part, can be NULL
1113  */
1114 int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1115 {
1116         int i, dot, baselen;
1117         const char *last_dot = strrchr(key, '.');
1118
1119         /*
1120          * Since "key" actually contains the section name and the real
1121          * key name separated by a dot, we have to know where the dot is.
1122          */
1123
1124         if (last_dot == NULL || last_dot == key) {
1125                 error("key does not contain a section: %s", key);
1126                 return -2;
1127         }
1128
1129         if (!last_dot[1]) {
1130                 error("key does not contain variable name: %s", key);
1131                 return -2;
1132         }
1133
1134         baselen = last_dot - key;
1135         if (baselen_)
1136                 *baselen_ = baselen;
1137
1138         /*
1139          * Validate the key and while at it, lower case it for matching.
1140          */
1141         *store_key = xmalloc(strlen(key) + 1);
1142
1143         dot = 0;
1144         for (i = 0; key[i]; i++) {
1145                 unsigned char c = key[i];
1146                 if (c == '.')
1147                         dot = 1;
1148                 /* Leave the extended basename untouched.. */
1149                 if (!dot || i > baselen) {
1150                         if (!iskeychar(c) ||
1151                             (i == baselen + 1 && !isalpha(c))) {
1152                                 error("invalid key: %s", key);
1153                                 goto out_free_ret_1;
1154                         }
1155                         c = tolower(c);
1156                 } else if (c == '\n') {
1157                         error("invalid key (newline): %s", key);
1158                         goto out_free_ret_1;
1159                 }
1160                 (*store_key)[i] = c;
1161         }
1162         (*store_key)[i] = 0;
1163
1164         return 0;
1165
1166 out_free_ret_1:
1167         free(*store_key);
1168         return -1;
1169 }
1170
1171 /*
1172  * If value==NULL, unset in (remove from) config,
1173  * if value_regex!=NULL, disregard key/value pairs where value does not match.
1174  * if multi_replace==0, nothing, or only one matching key/value is replaced,
1175  *     else all matching key/values (regardless how many) are removed,
1176  *     before the new pair is written.
1177  *
1178  * Returns 0 on success.
1179  *
1180  * This function does this:
1181  *
1182  * - it locks the config file by creating ".git/config.lock"
1183  *
1184  * - it then parses the config using store_aux() as validator to find
1185  *   the position on the key/value pair to replace. If it is to be unset,
1186  *   it must be found exactly once.
1187  *
1188  * - the config file is mmap()ed and the part before the match (if any) is
1189  *   written to the lock file, then the changed part and the rest.
1190  *
1191  * - the config file is removed and the lock file rename()d to it.
1192  *
1193  */
1194 int git_config_set_multivar(const char *key, const char *value,
1195         const char *value_regex, int multi_replace)
1196 {
1197         int fd = -1, in_fd;
1198         int ret;
1199         char *config_filename;
1200         struct lock_file *lock = NULL;
1201
1202         if (config_exclusive_filename)
1203                 config_filename = xstrdup(config_exclusive_filename);
1204         else
1205                 config_filename = git_pathdup("config");
1206
1207         /* parse-key returns negative; flip the sign to feed exit(3) */
1208         ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1209         if (ret)
1210                 goto out_free;
1211
1212         store.multi_replace = multi_replace;
1213
1214
1215         /*
1216          * The lock serves a purpose in addition to locking: the new
1217          * contents of .git/config will be written into it.
1218          */
1219         lock = xcalloc(sizeof(struct lock_file), 1);
1220         fd = hold_lock_file_for_update(lock, config_filename, 0);
1221         if (fd < 0) {
1222                 error("could not lock config file %s: %s", config_filename, strerror(errno));
1223                 free(store.key);
1224                 ret = -1;
1225                 goto out_free;
1226         }
1227
1228         /*
1229          * If .git/config does not exist yet, write a minimal version.
1230          */
1231         in_fd = open(config_filename, O_RDONLY);
1232         if ( in_fd < 0 ) {
1233                 free(store.key);
1234
1235                 if ( ENOENT != errno ) {
1236                         error("opening %s: %s", config_filename,
1237                               strerror(errno));
1238                         ret = 3; /* same as "invalid config file" */
1239                         goto out_free;
1240                 }
1241                 /* if nothing to unset, error out */
1242                 if (value == NULL) {
1243                         ret = 5;
1244                         goto out_free;
1245                 }
1246
1247                 store.key = (char *)key;
1248                 if (!store_write_section(fd, key) ||
1249                     !store_write_pair(fd, key, value))
1250                         goto write_err_out;
1251         } else {
1252                 struct stat st;
1253                 char *contents;
1254                 size_t contents_sz, copy_begin, copy_end;
1255                 int i, new_line = 0;
1256
1257                 if (value_regex == NULL)
1258                         store.value_regex = NULL;
1259                 else {
1260                         if (value_regex[0] == '!') {
1261                                 store.do_not_match = 1;
1262                                 value_regex++;
1263                         } else
1264                                 store.do_not_match = 0;
1265
1266                         store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1267                         if (regcomp(store.value_regex, value_regex,
1268                                         REG_EXTENDED)) {
1269                                 error("invalid pattern: %s", value_regex);
1270                                 free(store.value_regex);
1271                                 ret = 6;
1272                                 goto out_free;
1273                         }
1274                 }
1275
1276                 store.offset[0] = 0;
1277                 store.state = START;
1278                 store.seen = 0;
1279
1280                 /*
1281                  * After this, store.offset will contain the *end* offset
1282                  * of the last match, or remain at 0 if no match was found.
1283                  * As a side effect, we make sure to transform only a valid
1284                  * existing config file.
1285                  */
1286                 if (git_config_from_file(store_aux, config_filename, NULL)) {
1287                         error("invalid config file %s", config_filename);
1288                         free(store.key);
1289                         if (store.value_regex != NULL) {
1290                                 regfree(store.value_regex);
1291                                 free(store.value_regex);
1292                         }
1293                         ret = 3;
1294                         goto out_free;
1295                 }
1296
1297                 free(store.key);
1298                 if (store.value_regex != NULL) {
1299                         regfree(store.value_regex);
1300                         free(store.value_regex);
1301                 }
1302
1303                 /* if nothing to unset, or too many matches, error out */
1304                 if ((store.seen == 0 && value == NULL) ||
1305                                 (store.seen > 1 && multi_replace == 0)) {
1306                         ret = 5;
1307                         goto out_free;
1308                 }
1309
1310                 fstat(in_fd, &st);
1311                 contents_sz = xsize_t(st.st_size);
1312                 contents = xmmap(NULL, contents_sz, PROT_READ,
1313                         MAP_PRIVATE, in_fd, 0);
1314                 close(in_fd);
1315
1316                 if (store.seen == 0)
1317                         store.seen = 1;
1318
1319                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1320                         if (store.offset[i] == 0) {
1321                                 store.offset[i] = copy_end = contents_sz;
1322                         } else if (store.state != KEY_SEEN) {
1323                                 copy_end = store.offset[i];
1324                         } else
1325                                 copy_end = find_beginning_of_line(
1326                                         contents, contents_sz,
1327                                         store.offset[i]-2, &new_line);
1328
1329                         if (copy_end > 0 && contents[copy_end-1] != '\n')
1330                                 new_line = 1;
1331
1332                         /* write the first part of the config */
1333                         if (copy_end > copy_begin) {
1334                                 if (write_in_full(fd, contents + copy_begin,
1335                                                   copy_end - copy_begin) <
1336                                     copy_end - copy_begin)
1337                                         goto write_err_out;
1338                                 if (new_line &&
1339                                     write_str_in_full(fd, "\n") != 1)
1340                                         goto write_err_out;
1341                         }
1342                         copy_begin = store.offset[i];
1343                 }
1344
1345                 /* write the pair (value == NULL means unset) */
1346                 if (value != NULL) {
1347                         if (store.state == START) {
1348                                 if (!store_write_section(fd, key))
1349                                         goto write_err_out;
1350                         }
1351                         if (!store_write_pair(fd, key, value))
1352                                 goto write_err_out;
1353                 }
1354
1355                 /* write the rest of the config */
1356                 if (copy_begin < contents_sz)
1357                         if (write_in_full(fd, contents + copy_begin,
1358                                           contents_sz - copy_begin) <
1359                             contents_sz - copy_begin)
1360                                 goto write_err_out;
1361
1362                 munmap(contents, contents_sz);
1363         }
1364
1365         if (commit_lock_file(lock) < 0) {
1366                 error("could not commit config file %s", config_filename);
1367                 ret = 4;
1368                 goto out_free;
1369         }
1370
1371         /*
1372          * lock is committed, so don't try to roll it back below.
1373          * NOTE: Since lockfile.c keeps a linked list of all created
1374          * lock_file structures, it isn't safe to free(lock).  It's
1375          * better to just leave it hanging around.
1376          */
1377         lock = NULL;
1378         ret = 0;
1379
1380 out_free:
1381         if (lock)
1382                 rollback_lock_file(lock);
1383         free(config_filename);
1384         return ret;
1385
1386 write_err_out:
1387         ret = write_error(lock->filename);
1388         goto out_free;
1389
1390 }
1391
1392 static int section_name_match (const char *buf, const char *name)
1393 {
1394         int i = 0, j = 0, dot = 0;
1395         if (buf[i] != '[')
1396                 return 0;
1397         for (i = 1; buf[i] && buf[i] != ']'; i++) {
1398                 if (!dot && isspace(buf[i])) {
1399                         dot = 1;
1400                         if (name[j++] != '.')
1401                                 break;
1402                         for (i++; isspace(buf[i]); i++)
1403                                 ; /* do nothing */
1404                         if (buf[i] != '"')
1405                                 break;
1406                         continue;
1407                 }
1408                 if (buf[i] == '\\' && dot)
1409                         i++;
1410                 else if (buf[i] == '"' && dot) {
1411                         for (i++; isspace(buf[i]); i++)
1412                                 ; /* do_nothing */
1413                         break;
1414                 }
1415                 if (buf[i] != name[j++])
1416                         break;
1417         }
1418         if (buf[i] == ']' && name[j] == 0) {
1419                 /*
1420                  * We match, now just find the right length offset by
1421                  * gobbling up any whitespace after it, as well
1422                  */
1423                 i++;
1424                 for (; buf[i] && isspace(buf[i]); i++)
1425                         ; /* do nothing */
1426                 return i;
1427         }
1428         return 0;
1429 }
1430
1431 /* if new_name == NULL, the section is removed instead */
1432 int git_config_rename_section(const char *old_name, const char *new_name)
1433 {
1434         int ret = 0, remove = 0;
1435         char *config_filename;
1436         struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1437         int out_fd;
1438         char buf[1024];
1439
1440         if (config_exclusive_filename)
1441                 config_filename = xstrdup(config_exclusive_filename);
1442         else
1443                 config_filename = git_pathdup("config");
1444         out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1445         if (out_fd < 0) {
1446                 ret = error("could not lock config file %s", config_filename);
1447                 goto out;
1448         }
1449
1450         if (!(config_file = fopen(config_filename, "rb"))) {
1451                 /* no config file means nothing to rename, no error */
1452                 goto unlock_and_out;
1453         }
1454
1455         while (fgets(buf, sizeof(buf), config_file)) {
1456                 int i;
1457                 int length;
1458                 char *output = buf;
1459                 for (i = 0; buf[i] && isspace(buf[i]); i++)
1460                         ; /* do nothing */
1461                 if (buf[i] == '[') {
1462                         /* it's a section */
1463                         int offset = section_name_match(&buf[i], old_name);
1464                         if (offset > 0) {
1465                                 ret++;
1466                                 if (new_name == NULL) {
1467                                         remove = 1;
1468                                         continue;
1469                                 }
1470                                 store.baselen = strlen(new_name);
1471                                 if (!store_write_section(out_fd, new_name)) {
1472                                         ret = write_error(lock->filename);
1473                                         goto out;
1474                                 }
1475                                 /*
1476                                  * We wrote out the new section, with
1477                                  * a newline, now skip the old
1478                                  * section's length
1479                                  */
1480                                 output += offset + i;
1481                                 if (strlen(output) > 0) {
1482                                         /*
1483                                          * More content means there's
1484                                          * a declaration to put on the
1485                                          * next line; indent with a
1486                                          * tab
1487                                          */
1488                                         output -= 1;
1489                                         output[0] = '\t';
1490                                 }
1491                         }
1492                         remove = 0;
1493                 }
1494                 if (remove)
1495                         continue;
1496                 length = strlen(output);
1497                 if (write_in_full(out_fd, output, length) != length) {
1498                         ret = write_error(lock->filename);
1499                         goto out;
1500                 }
1501         }
1502         fclose(config_file);
1503  unlock_and_out:
1504         if (commit_lock_file(lock) < 0)
1505                 ret = error("could not commit config file %s", config_filename);
1506  out:
1507         free(config_filename);
1508         return ret;
1509 }
1510
1511 /*
1512  * Call this to report error for your variable that should not
1513  * get a boolean value (i.e. "[my] var" means "true").
1514  */
1515 int config_error_nonbool(const char *var)
1516 {
1517         return error("Missing value for '%s'", var);
1518 }