config.c

   1 /*
   2  * GIT - The information manager from hell
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  * Copyright (C) Johannes Schindelin, 2005
   6  *
   7  */
   8 #include "cache.h"
   9 #include "exec_cmd.h"
  10 #include "strbuf.h"
  11 #include "quote.h"
  12
  13 #define MAXNAME (256)
  14
  15 static FILE *config_file;
  16 static const char *config_file_name;
  17 static int config_linenr;
  18 static int config_file_eof;
  19 static int zlib_compression_seen;
  20
  21 const char *config_exclusive_filename = NULL;
  22
  23 struct config_item
  24 {
  25         struct config_item *next;
  26         char *name;
  27         char *value;
  28 };
  29 static struct config_item *config_parameters;
  30 static struct config_item **config_parameters_tail = &config_parameters;
  31
  32 static void lowercase(char *p)
  33 {
  34         for (; *p; p++)
  35                 *p = tolower(*p);
  36 }
  37
  38 void git_config_push_parameter(const char *text)
  39 {
  40         struct strbuf env = STRBUF_INIT;
  41         const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
  42         if (old) {
  43                 strbuf_addstr(&env, old);
  44                 strbuf_addch(&env, ' ');
  45         }
  46         sq_quote_buf(&env, text);
  47         setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
  48         strbuf_release(&env);
  49 }
  50
  51 int git_config_parse_parameter(const char *text)
  52 {
  53         struct config_item *ct;
  54         struct strbuf tmp = STRBUF_INIT;
  55         struct strbuf **pair;
  56         strbuf_addstr(&tmp, text);
  57         pair = strbuf_split(&tmp, '=');
  58         if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
  59                 strbuf_setlen(pair[0], pair[0]->len - 1);
  60         strbuf_trim(pair[0]);
  61         if (!pair[0]->len) {
  62                 strbuf_list_free(pair);
  63                 return -1;
  64         }
  65         ct = xcalloc(1, sizeof(struct config_item));
  66         ct->name = strbuf_detach(pair[0], NULL);
  67         if (pair[1]) {
  68                 strbuf_trim(pair[1]);
  69                 ct->value = strbuf_detach(pair[1], NULL);
  70         }
  71         strbuf_list_free(pair);
  72         lowercase(ct->name);
  73         *config_parameters_tail = ct;
  74         config_parameters_tail = &ct->next;
  75         return 0;
  76 }
  77
  78 int git_config_parse_environment(void) {
  79         const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
  80         char *envw;
  81         const char **argv = NULL;
  82         int nr = 0, alloc = 0;
  83         int i;
  84
  85         if (!env)
  86                 return 0;
  87         /* sq_dequote will write over it */
  88         envw = xstrdup(env);
  89
  90         if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
  91                 free(envw);
  92                 return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
  93         }
  94
  95         for (i = 0; i < nr; i++) {
  96                 if (git_config_parse_parameter(argv[i]) < 0) {
  97                         error("bogus config parameter: %s", argv[i]);
  98                         free(argv);
  99                         free(envw);
 100                         return -1;
 101                 }
 102         }
 103
 104         free(argv);
 105         free(envw);
 106         return 0;
 107 }
 108
 109 static int get_next_char(void)
 110 {
 111         int c;
 112         FILE *f;
 113
 114         c = '\n';
 115         if ((f = config_file) != NULL) {
 116                 c = fgetc(f);
 117                 if (c == '\r') {
 118                         /* DOS like systems */
 119                         c = fgetc(f);
 120                         if (c != '\n') {
 121                                 ungetc(c, f);
 122                                 c = '\r';
 123                         }
 124                 }
 125                 if (c == '\n')
 126                         config_linenr++;
 127                 if (c == EOF) {
 128                         config_file_eof = 1;
 129                         c = '\n';
 130                 }
 131         }
 132         return c;
 133 }
 134
 135 static char *parse_value(void)
 136 {
 137         static char value[1024];
 138         int quote = 0, comment = 0, len = 0, space = 0;
 139
 140         for (;;) {
 141                 int c = get_next_char();
 142                 if (len >= sizeof(value) - 1)
 143                         return NULL;
 144                 if (c == '\n') {
 145                         if (quote)
 146                                 return NULL;
 147                         value[len] = 0;
 148                         return value;
 149                 }
 150                 if (comment)
 151                         continue;
 152                 if (isspace(c) && !quote) {
 153                         if (len)
 154                                 space++;
 155                         continue;
 156                 }
 157                 if (!quote) {
 158                         if (c == ';' || c == '#') {
 159                                 comment = 1;
 160                                 continue;
 161                         }
 162                 }
 163                 for (; space; space--)
 164                         value[len++] = ' ';
 165                 if (c == '\\') {
 166                         c = get_next_char();
 167                         switch (c) {
 168                         case '\n':
 169                                 continue;
 170                         case 't':
 171                                 c = '\t';
 172                                 break;
 173                         case 'b':
 174                                 c = '\b';
 175                                 break;
 176                         case 'n':
 177                                 c = '\n';
 178                                 break;
 179                         /* Some characters escape as themselves */
 180                         case '\\': case '"':
 181                                 break;
 182                         /* Reject unknown escape sequences */
 183                         default:
 184                                 return NULL;
 185                         }
 186                         value[len++] = c;
 187                         continue;
 188                 }
 189                 if (c == '"') {
 190                         quote = 1-quote;
 191                         continue;
 192                 }
 193                 value[len++] = c;
 194         }
 195 }
 196
 197 static inline int iskeychar(int c)
 198 {
 199         return isalnum(c) || c == '-';
 200 }
 201
 202 static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
 203 {
 204         int c;
 205         char *value;
 206
 207         /* Get the full name */
 208         for (;;) {
 209                 c = get_next_char();
 210                 if (config_file_eof)
 211                         break;
 212                 if (!iskeychar(c))
 213                         break;
 214                 name[len++] = tolower(c);
 215                 if (len >= MAXNAME)
 216                         return -1;
 217         }
 218         name[len] = 0;
 219         while (c == ' ' || c == '\t')
 220                 c = get_next_char();
 221
 222         value = NULL;
 223         if (c != '\n') {
 224                 if (c != '=')
 225                         return -1;
 226                 value = parse_value();
 227                 if (!value)
 228                         return -1;
 229         }
 230         return fn(name, value, data);
 231 }
 232
 233 static int get_extended_base_var(char *name, int baselen, int c)
 234 {
 235         do {
 236                 if (c == '\n')
 237                         return -1;
 238                 c = get_next_char();
 239         } while (isspace(c));
 240
 241         /* We require the format to be '[base "extension"]' */
 242         if (c != '"')
 243                 return -1;
 244         name[baselen++] = '.';
 245
 246         for (;;) {
 247                 int c = get_next_char();
 248                 if (c == '\n')
 249                         return -1;
 250                 if (c == '"')
 251                         break;
 252                 if (c == '\\') {
 253                         c = get_next_char();
 254                         if (c == '\n')
 255                                 return -1;
 256                 }
 257                 name[baselen++] = c;
 258                 if (baselen > MAXNAME / 2)
 259                         return -1;
 260         }
 261
 262         /* Final ']' */
 263         if (get_next_char() != ']')
 264                 return -1;
 265         return baselen;
 266 }
 267
 268 static int get_base_var(char *name)
 269 {
 270         int baselen = 0;
 271
 272         for (;;) {
 273                 int c = get_next_char();
 274                 if (config_file_eof)
 275                         return -1;
 276                 if (c == ']')
 277                         return baselen;
 278                 if (isspace(c))
 279                         return get_extended_base_var(name, baselen, c);
 280                 if (!iskeychar(c) && c != '.')
 281                         return -1;
 282                 if (baselen > MAXNAME / 2)
 283                         return -1;
 284                 name[baselen++] = tolower(c);
 285         }
 286 }
 287
 288 static int git_parse_file(config_fn_t fn, void *data)
 289 {
 290         int comment = 0;
 291         int baselen = 0;
 292         static char var[MAXNAME];
 293
 294         /* U+FEFF Byte Order Mark in UTF8 */
 295         static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 296         const unsigned char *bomptr = utf8_bom;
 297
 298         for (;;) {
 299                 int c = get_next_char();
 300                 if (bomptr && *bomptr) {
 301                         /* We are at the file beginning; skip UTF8-encoded BOM
 302                          * if present. Sane editors won't put this in on their
 303                          * own, but e.g. Windows Notepad will do it happily. */
 304                         if ((unsigned char) c == *bomptr) {
 305                                 bomptr++;
 306                                 continue;
 307                         } else {
 308                                 /* Do not tolerate partial BOM. */
 309                                 if (bomptr != utf8_bom)
 310                                         break;
 311                                 /* No BOM at file beginning. Cool. */
 312                                 bomptr = NULL;
 313                         }
 314                 }
 315                 if (c == '\n') {
 316                         if (config_file_eof)
 317                                 return 0;
 318                         comment = 0;
 319                         continue;
 320                 }
 321                 if (comment || isspace(c))
 322                         continue;
 323                 if (c == '#' || c == ';') {
 324                         comment = 1;
 325                         continue;
 326                 }
 327                 if (c == '[') {
 328                         baselen = get_base_var(var);
 329                         if (baselen <= 0)
 330                                 break;
 331                         var[baselen++] = '.';
 332                         var[baselen] = 0;
 333                         continue;
 334                 }
 335                 if (!isalpha(c))
 336                         break;
 337                 var[baselen] = tolower(c);
 338                 if (get_value(fn, data, var, baselen+1) < 0)
 339                         break;
 340         }
 341         die("bad config file line %d in %s", config_linenr, config_file_name);
 342 }
 343
 344 static int parse_unit_factor(const char *end, unsigned long *val)
 345 {
 346         if (!*end)
 347                 return 1;
 348         else if (!strcasecmp(end, "k")) {
 349                 *val *= 1024;
 350                 return 1;
 351         }
 352         else if (!strcasecmp(end, "m")) {
 353                 *val *= 1024 * 1024;
 354                 return 1;
 355         }
 356         else if (!strcasecmp(end, "g")) {
 357                 *val *= 1024 * 1024 * 1024;
 358                 return 1;
 359         }
 360         return 0;
 361 }
 362
 363 static int git_parse_long(const char *value, long *ret)
 364 {
 365         if (value && *value) {
 366                 char *end;
 367                 long val = strtol(value, &end, 0);
 368                 unsigned long factor = 1;
 369                 if (!parse_unit_factor(end, &factor))
 370                         return 0;
 371                 *ret = val * factor;
 372                 return 1;
 373         }
 374         return 0;
 375 }
 376
 377 int git_parse_ulong(const char *value, unsigned long *ret)
 378 {
 379         if (value && *value) {
 380                 char *end;
 381                 unsigned long val = strtoul(value, &end, 0);
 382                 if (!parse_unit_factor(end, &val))
 383                         return 0;
 384                 *ret = val;
 385                 return 1;
 386         }
 387         return 0;
 388 }
 389
 390 static void die_bad_config(const char *name)
 391 {
 392         if (config_file_name)
 393                 die("bad config value for '%s' in %s", name, config_file_name);
 394         die("bad config value for '%s'", name);
 395 }
 396
 397 int git_config_int(const char *name, const char *value)
 398 {
 399         long ret = 0;
 400         if (!git_parse_long(value, &ret))
 401                 die_bad_config(name);
 402         return ret;
 403 }
 404
 405 unsigned long git_config_ulong(const char *name, const char *value)
 406 {
 407         unsigned long ret;
 408         if (!git_parse_ulong(value, &ret))
 409                 die_bad_config(name);
 410         return ret;
 411 }
 412
 413 static int git_config_maybe_bool_text(const char *name, const char *value)
 414 {
 415         if (!value)
 416                 return 1;
 417         if (!*value)
 418                 return 0;
 419         if (!strcasecmp(value, "true")
 420             || !strcasecmp(value, "yes")
 421             || !strcasecmp(value, "on"))
 422                 return 1;
 423         if (!strcasecmp(value, "false")
 424             || !strcasecmp(value, "no")
 425             || !strcasecmp(value, "off"))
 426                 return 0;
 427         return -1;
 428 }
 429
 430 int git_config_maybe_bool(const char *name, const char *value)
 431 {
 432         int v = git_config_maybe_bool_text(name, value);
 433         if (0 <= v)
 434                 return v;
 435         if (!strcmp(value, "0"))
 436                 return 0;
 437         if (!strcmp(value, "1"))
 438                 return 1;
 439         return -1;
 440 }
 441
 442 int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 443 {
 444         int v = git_config_maybe_bool_text(name, value);
 445         if (0 <= v) {
 446                 *is_bool = 1;
 447                 return v;
 448         }
 449         *is_bool = 0;
 450         return git_config_int(name, value);
 451 }
 452
 453 int git_config_bool(const char *name, const char *value)
 454 {
 455         int discard;
 456         return !!git_config_bool_or_int(name, value, &discard);
 457 }
 458
 459 int git_config_string(const char **dest, const char *var, const char *value)
 460 {
 461         if (!value)
 462                 return config_error_nonbool(var);
 463         *dest = xstrdup(value);
 464         return 0;
 465 }
 466
 467 int git_config_pathname(const char **dest, const char *var, const char *value)
 468 {
 469         if (!value)
 470                 return config_error_nonbool(var);
 471         *dest = expand_user_path(value);
 472         if (!*dest)
 473                 die("Failed to expand user dir in: '%s'", value);
 474         return 0;
 475 }
 476
 477 static int git_default_core_config(const char *var, const char *value)
 478 {
 479         /* This needs a better name */
 480         if (!strcmp(var, "core.filemode")) {
 481                 trust_executable_bit = git_config_bool(var, value);
 482                 return 0;
 483         }
 484         if (!strcmp(var, "core.trustctime")) {
 485                 trust_ctime = git_config_bool(var, value);
 486                 return 0;
 487         }
 488
 489         if (!strcmp(var, "core.quotepath")) {
 490                 quote_path_fully = git_config_bool(var, value);
 491                 return 0;
 492         }
 493
 494         if (!strcmp(var, "core.symlinks")) {
 495                 has_symlinks = git_config_bool(var, value);
 496                 return 0;
 497         }
 498
 499         if (!strcmp(var, "core.ignorecase")) {
 500                 ignore_case = git_config_bool(var, value);
 501                 return 0;
 502         }
 503
 504         if (!strcmp(var, "core.bare")) {
 505                 is_bare_repository_cfg = git_config_bool(var, value);
 506                 return 0;
 507         }
 508
 509         if (!strcmp(var, "core.ignorestat")) {
 510                 assume_unchanged = git_config_bool(var, value);
 511                 return 0;
 512         }
 513
 514         if (!strcmp(var, "core.prefersymlinkrefs")) {
 515                 prefer_symlink_refs = git_config_bool(var, value);
 516                 return 0;
 517         }
 518
 519         if (!strcmp(var, "core.logallrefupdates")) {
 520                 log_all_ref_updates = git_config_bool(var, value);
 521                 return 0;
 522         }
 523
 524         if (!strcmp(var, "core.warnambiguousrefs")) {
 525                 warn_ambiguous_refs = git_config_bool(var, value);
 526                 return 0;
 527         }
 528
 529         if (!strcmp(var, "core.loosecompression")) {
 530                 int level = git_config_int(var, value);
 531                 if (level == -1)
 532                         level = Z_DEFAULT_COMPRESSION;
 533                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 534                         die("bad zlib compression level %d", level);
 535                 zlib_compression_level = level;
 536                 zlib_compression_seen = 1;
 537                 return 0;
 538         }
 539
 540         if (!strcmp(var, "core.compression")) {
 541                 int level = git_config_int(var, value);
 542                 if (level == -1)
 543                         level = Z_DEFAULT_COMPRESSION;
 544                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 545                         die("bad zlib compression level %d", level);
 546                 core_compression_level = level;
 547                 core_compression_seen = 1;
 548                 if (!zlib_compression_seen)
 549                         zlib_compression_level = level;
 550                 return 0;
 551         }
 552
 553         if (!strcmp(var, "core.packedgitwindowsize")) {
 554                 int pgsz_x2 = getpagesize() * 2;
 555                 packed_git_window_size = git_config_int(var, value);
 556
 557                 /* This value must be multiple of (pagesize * 2) */
 558                 packed_git_window_size /= pgsz_x2;
 559                 if (packed_git_window_size < 1)
 560                         packed_git_window_size = 1;
 561                 packed_git_window_size *= pgsz_x2;
 562                 return 0;
 563         }
 564
 565         if (!strcmp(var, "core.packedgitlimit")) {
 566                 packed_git_limit = git_config_int(var, value);
 567                 return 0;
 568         }
 569
 570         if (!strcmp(var, "core.deltabasecachelimit")) {
 571                 delta_base_cache_limit = git_config_int(var, value);
 572                 return 0;
 573         }
 574
 575         if (!strcmp(var, "core.autocrlf")) {
 576                 if (value && !strcasecmp(value, "input")) {
 577                         if (eol == EOL_CRLF)
 578                                 return error("core.autocrlf=input conflicts with core.eol=crlf");
 579                         auto_crlf = AUTO_CRLF_INPUT;
 580                         return 0;
 581                 }
 582                 auto_crlf = git_config_bool(var, value);
 583                 return 0;
 584         }
 585
 586         if (!strcmp(var, "core.safecrlf")) {
 587                 if (value && !strcasecmp(value, "warn")) {
 588                         safe_crlf = SAFE_CRLF_WARN;
 589                         return 0;
 590                 }
 591                 safe_crlf = git_config_bool(var, value);
 592                 return 0;
 593         }
 594
 595         if (!strcmp(var, "core.eol")) {
 596                 if (value && !strcasecmp(value, "lf"))
 597                         eol = EOL_LF;
 598                 else if (value && !strcasecmp(value, "crlf"))
 599                         eol = EOL_CRLF;
 600                 else if (value && !strcasecmp(value, "native"))
 601                         eol = EOL_NATIVE;
 602                 else
 603                         eol = EOL_UNSET;
 604                 if (eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 605                         return error("core.autocrlf=input conflicts with core.eol=crlf");
 606                 return 0;
 607         }
 608
 609         if (!strcmp(var, "core.notesref")) {
 610                 notes_ref_name = xstrdup(value);
 611                 return 0;
 612         }
 613
 614         if (!strcmp(var, "core.pager"))
 615                 return git_config_string(&pager_program, var, value);
 616
 617         if (!strcmp(var, "core.editor"))
 618                 return git_config_string(&editor_program, var, value);
 619
 620         if (!strcmp(var, "core.askpass"))
 621                 return git_config_string(&askpass_program, var, value);
 622
 623         if (!strcmp(var, "core.excludesfile"))
 624                 return git_config_pathname(&excludes_file, var, value);
 625
 626         if (!strcmp(var, "core.whitespace")) {
 627                 if (!value)
 628                         return config_error_nonbool(var);
 629                 whitespace_rule_cfg = parse_whitespace_rule(value);
 630                 return 0;
 631         }
 632
 633         if (!strcmp(var, "core.fsyncobjectfiles")) {
 634                 fsync_object_files = git_config_bool(var, value);
 635                 return 0;
 636         }
 637
 638         if (!strcmp(var, "core.preloadindex")) {
 639                 core_preload_index = git_config_bool(var, value);
 640                 return 0;
 641         }
 642
 643         if (!strcmp(var, "core.createobject")) {
 644                 if (!strcmp(value, "rename"))
 645                         object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 646                 else if (!strcmp(value, "link"))
 647                         object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 648                 else
 649                         die("Invalid mode for object creation: %s", value);
 650                 return 0;
 651         }
 652
 653         if (!strcmp(var, "core.sparsecheckout")) {
 654                 core_apply_sparse_checkout = git_config_bool(var, value);
 655                 return 0;
 656         }
 657
 658         /* Add other config variables here and to Documentation/config.txt. */
 659         return 0;
 660 }
 661
 662 static int git_default_user_config(const char *var, const char *value)
 663 {
 664         if (!strcmp(var, "user.name")) {
 665                 if (!value)
 666                         return config_error_nonbool(var);
 667                 strlcpy(git_default_name, value, sizeof(git_default_name));
 668                 user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 669                 return 0;
 670         }
 671
 672         if (!strcmp(var, "user.email")) {
 673                 if (!value)
 674                         return config_error_nonbool(var);
 675                 strlcpy(git_default_email, value, sizeof(git_default_email));
 676                 user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 677                 return 0;
 678         }
 679
 680         /* Add other config variables here and to Documentation/config.txt. */
 681         return 0;
 682 }
 683
 684 static int git_default_i18n_config(const char *var, const char *value)
 685 {
 686         if (!strcmp(var, "i18n.commitencoding"))
 687                 return git_config_string(&git_commit_encoding, var, value);
 688
 689         if (!strcmp(var, "i18n.logoutputencoding"))
 690                 return git_config_string(&git_log_output_encoding, var, value);
 691
 692         /* Add other config variables here and to Documentation/config.txt. */
 693         return 0;
 694 }
 695
 696 static int git_default_branch_config(const char *var, const char *value)
 697 {
 698         if (!strcmp(var, "branch.autosetupmerge")) {
 699                 if (value && !strcasecmp(value, "always")) {
 700                         git_branch_track = BRANCH_TRACK_ALWAYS;
 701                         return 0;
 702                 }
 703                 git_branch_track = git_config_bool(var, value);
 704                 return 0;
 705         }
 706         if (!strcmp(var, "branch.autosetuprebase")) {
 707                 if (!value)
 708                         return config_error_nonbool(var);
 709                 else if (!strcmp(value, "never"))
 710                         autorebase = AUTOREBASE_NEVER;
 711                 else if (!strcmp(value, "local"))
 712                         autorebase = AUTOREBASE_LOCAL;
 713                 else if (!strcmp(value, "remote"))
 714                         autorebase = AUTOREBASE_REMOTE;
 715                 else if (!strcmp(value, "always"))
 716                         autorebase = AUTOREBASE_ALWAYS;
 717                 else
 718                         return error("Malformed value for %s", var);
 719                 return 0;
 720         }
 721
 722         /* Add other config variables here and to Documentation/config.txt. */
 723         return 0;
 724 }
 725
 726 static int git_default_push_config(const char *var, const char *value)
 727 {
 728         if (!strcmp(var, "push.default")) {
 729                 if (!value)
 730                         return config_error_nonbool(var);
 731                 else if (!strcmp(value, "nothing"))
 732                         push_default = PUSH_DEFAULT_NOTHING;
 733                 else if (!strcmp(value, "matching"))
 734                         push_default = PUSH_DEFAULT_MATCHING;
 735                 else if (!strcmp(value, "tracking"))
 736                         push_default = PUSH_DEFAULT_TRACKING;
 737                 else if (!strcmp(value, "current"))
 738                         push_default = PUSH_DEFAULT_CURRENT;
 739                 else {
 740                         error("Malformed value for %s: %s", var, value);
 741                         return error("Must be one of nothing, matching, "
 742                                      "tracking or current.");
 743                 }
 744                 return 0;
 745         }
 746
 747         /* Add other config variables here and to Documentation/config.txt. */
 748         return 0;
 749 }
 750
 751 static int git_default_mailmap_config(const char *var, const char *value)
 752 {
 753         if (!strcmp(var, "mailmap.file"))
 754                 return git_config_string(&git_mailmap_file, var, value);
 755
 756         /* Add other config variables here and to Documentation/config.txt. */
 757         return 0;
 758 }
 759
 760 int git_default_config(const char *var, const char *value, void *dummy)
 761 {
 762         if (!prefixcmp(var, "core."))
 763                 return git_default_core_config(var, value);
 764
 765         if (!prefixcmp(var, "user."))
 766                 return git_default_user_config(var, value);
 767
 768         if (!prefixcmp(var, "i18n."))
 769                 return git_default_i18n_config(var, value);
 770
 771         if (!prefixcmp(var, "branch."))
 772                 return git_default_branch_config(var, value);
 773
 774         if (!prefixcmp(var, "push."))
 775                 return git_default_push_config(var, value);
 776
 777         if (!prefixcmp(var, "mailmap."))
 778                 return git_default_mailmap_config(var, value);
 779
 780         if (!prefixcmp(var, "advice."))
 781                 return git_default_advice_config(var, value);
 782
 783         if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 784                 pager_use_color = git_config_bool(var,value);
 785                 return 0;
 786         }
 787
 788         /* Add other config variables here and to Documentation/config.txt. */
 789         return 0;
 790 }
 791
 792 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 793 {
 794         int ret;
 795         FILE *f = fopen(filename, "r");
 796
 797         ret = -1;
 798         if (f) {
 799                 config_file = f;
 800                 config_file_name = filename;
 801                 config_linenr = 1;
 802                 config_file_eof = 0;
 803                 ret = git_parse_file(fn, data);
 804                 fclose(f);
 805                 config_file_name = NULL;
 806         }
 807         return ret;
 808 }
 809
 810 const char *git_etc_gitconfig(void)
 811 {
 812         static const char *system_wide;
 813         if (!system_wide)
 814                 system_wide = system_path(ETC_GITCONFIG);
 815         return system_wide;
 816 }
 817
 818 int git_env_bool(const char *k, int def)
 819 {
 820         const char *v = getenv(k);
 821         return v ? git_config_bool(k, v) : def;
 822 }
 823
 824 int git_config_system(void)
 825 {
 826         return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 827 }
 828
 829 int git_config_global(void)
 830 {
 831         return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
 832 }
 833
 834 int git_config_from_parameters(config_fn_t fn, void *data)
 835 {
 836         static int loaded_environment;
 837         const struct config_item *ct;
 838
 839         if (!loaded_environment) {
 840                 if (git_config_parse_environment() < 0)
 841                         return -1;
 842                 loaded_environment = 1;
 843         }
 844         for (ct = config_parameters; ct; ct = ct->next)
 845                 if (fn(ct->name, ct->value, data) < 0)
 846                         return -1;
 847         return 0;
 848 }
 849
 850 int git_config(config_fn_t fn, void *data)
 851 {
 852         int ret = 0, found = 0;
 853         char *repo_config = NULL;
 854         const char *home = NULL;
 855
 856         /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
 857         if (config_exclusive_filename)
 858                 return git_config_from_file(fn, config_exclusive_filename, data);
 859         if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 860                 ret += git_config_from_file(fn, git_etc_gitconfig(),
 861                                             data);
 862                 found += 1;
 863         }
 864
 865         home = getenv("HOME");
 866         if (git_config_global() && home) {
 867                 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
 868                 if (!access(user_config, R_OK)) {
 869                         ret += git_config_from_file(fn, user_config, data);
 870                         found += 1;
 871                 }
 872                 free(user_config);
 873         }
 874
 875         repo_config = git_pathdup("config");
 876         if (!access(repo_config, R_OK)) {
 877                 ret += git_config_from_file(fn, repo_config, data);
 878                 found += 1;
 879         }
 880         free(repo_config);
 881
 882         ret += git_config_from_parameters(fn, data);
 883         if (config_parameters)
 884                 found += 1;
 885
 886         if (found == 0)
 887                 return -1;
 888         return ret;
 889 }
 890
 891 /*
 892  * Find all the stuff for git_config_set() below.
 893  */
 894
 895 #define MAX_MATCHES 512
 896
 897 static struct {
 898         int baselen;
 899         char *key;
 900         int do_not_match;
 901         regex_t *value_regex;
 902         int multi_replace;
 903         size_t offset[MAX_MATCHES];
 904         enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 905         int seen;
 906 } store;
 907
 908 static int matches(const char *key, const char *value)
 909 {
 910         return !strcmp(key, store.key) &&
 911                 (store.value_regex == NULL ||
 912                  (store.do_not_match ^
 913                   !regexec(store.value_regex, value, 0, NULL, 0)));
 914 }
 915
 916 static int store_aux(const char *key, const char *value, void *cb)
 917 {
 918         const char *ep;
 919         size_t section_len;
 920
 921         switch (store.state) {
 922         case KEY_SEEN:
 923                 if (matches(key, value)) {
 924                         if (store.seen == 1 && store.multi_replace == 0) {
 925                                 warning("%s has multiple values", key);
 926                         } else if (store.seen >= MAX_MATCHES) {
 927                                 error("too many matches for %s", key);
 928                                 return 1;
 929                         }
 930
 931                         store.offset[store.seen] = ftell(config_file);
 932                         store.seen++;
 933                 }
 934                 break;
 935         case SECTION_SEEN:
 936                 /*
 937                  * What we are looking for is in store.key (both
 938                  * section and var), and its section part is baselen
 939                  * long.  We found key (again, both section and var).
 940                  * We would want to know if this key is in the same
 941                  * section as what we are looking for.  We already
 942                  * know we are in the same section as what should
 943                  * hold store.key.
 944                  */
 945                 ep = strrchr(key, '.');
 946                 section_len = ep - key;
 947
 948                 if ((section_len != store.baselen) ||
 949                     memcmp(key, store.key, section_len+1)) {
 950                         store.state = SECTION_END_SEEN;
 951                         break;
 952                 }
 953
 954                 /*
 955                  * Do not increment matches: this is no match, but we
 956                  * just made sure we are in the desired section.
 957                  */
 958                 store.offset[store.seen] = ftell(config_file);
 959                 /* fallthru */
 960         case SECTION_END_SEEN:
 961         case START:
 962                 if (matches(key, value)) {
 963                         store.offset[store.seen] = ftell(config_file);
 964                         store.state = KEY_SEEN;
 965                         store.seen++;
 966                 } else {
 967                         if (strrchr(key, '.') - key == store.baselen &&
 968                               !strncmp(key, store.key, store.baselen)) {
 969                                         store.state = SECTION_SEEN;
 970                                         store.offset[store.seen] = ftell(config_file);
 971                         }
 972                 }
 973         }
 974         return 0;
 975 }
 976
 977 static int write_error(const char *filename)
 978 {
 979         error("failed to write new configuration file %s", filename);
 980
 981         /* Same error code as "failed to rename". */
 982         return 4;
 983 }
 984
 985 static int store_write_section(int fd, const char *key)
 986 {
 987         const char *dot;
 988         int i, success;
 989         struct strbuf sb = STRBUF_INIT;
 990
 991         dot = memchr(key, '.', store.baselen);
 992         if (dot) {
 993                 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
 994                 for (i = dot - key + 1; i < store.baselen; i++) {
 995                         if (key[i] == '"' || key[i] == '\\')
 996                                 strbuf_addch(&sb, '\\');
 997                         strbuf_addch(&sb, key[i]);
 998                 }
 999                 strbuf_addstr(&sb, "\"]\n");
1000         } else {
1001                 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1002         }
1003
1004         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1005         strbuf_release(&sb);
1006
1007         return success;
1008 }
1009
1010 static int store_write_pair(int fd, const char *key, const char *value)
1011 {
1012         int i, success;
1013         int length = strlen(key + store.baselen + 1);
1014         const char *quote = "";
1015         struct strbuf sb = STRBUF_INIT;
1016
1017         /*
1018          * Check to see if the value needs to be surrounded with a dq pair.
1019          * Note that problematic characters are always backslash-quoted; this
1020          * check is about not losing leading or trailing SP and strings that
1021          * follow beginning-of-comment characters (i.e. ';' and '#') by the
1022          * configuration parser.
1023          */
1024         if (value[0] == ' ')
1025                 quote = "\"";
1026         for (i = 0; value[i]; i++)
1027                 if (value[i] == ';' || value[i] == '#')
1028                         quote = "\"";
1029         if (i && value[i - 1] == ' ')
1030                 quote = "\"";
1031
1032         strbuf_addf(&sb, "\t%.*s = %s",
1033                     length, key + store.baselen + 1, quote);
1034
1035         for (i = 0; value[i]; i++)
1036                 switch (value[i]) {
1037                 case '\n':
1038                         strbuf_addstr(&sb, "\\n");
1039                         break;
1040                 case '\t':
1041                         strbuf_addstr(&sb, "\\t");
1042                         break;
1043                 case '"':
1044                 case '\\':
1045                         strbuf_addch(&sb, '\\');
1046                 default:
1047                         strbuf_addch(&sb, value[i]);
1048                         break;
1049                 }
1050         strbuf_addf(&sb, "%s\n", quote);
1051
1052         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1053         strbuf_release(&sb);
1054
1055         return success;
1056 }
1057
1058 static ssize_t find_beginning_of_line(const char *contents, size_t size,
1059         size_t offset_, int *found_bracket)
1060 {
1061         size_t equal_offset = size, bracket_offset = size;
1062         ssize_t offset;
1063
1064 contline:
1065         for (offset = offset_-2; offset > 0
1066                         && contents[offset] != '\n'; offset--)
1067                 switch (contents[offset]) {
1068                         case '=': equal_offset = offset; break;
1069                         case ']': bracket_offset = offset; break;
1070                 }
1071         if (offset > 0 && contents[offset-1] == '\\') {
1072                 offset_ = offset;
1073                 goto contline;
1074         }
1075         if (bracket_offset < equal_offset) {
1076                 *found_bracket = 1;
1077                 offset = bracket_offset+1;
1078         } else
1079                 offset++;
1080
1081         return offset;
1082 }
1083
1084 int git_config_set(const char *key, const char *value)
1085 {
1086         return git_config_set_multivar(key, value, NULL, 0);
1087 }
1088
1089 /*
1090  * If value==NULL, unset in (remove from) config,
1091  * if value_regex!=NULL, disregard key/value pairs where value does not match.
1092  * if multi_replace==0, nothing, or only one matching key/value is replaced,
1093  *     else all matching key/values (regardless how many) are removed,
1094  *     before the new pair is written.
1095  *
1096  * Returns 0 on success.
1097  *
1098  * This function does this:
1099  *
1100  * - it locks the config file by creating ".git/config.lock"
1101  *
1102  * - it then parses the config using store_aux() as validator to find
1103  *   the position on the key/value pair to replace. If it is to be unset,
1104  *   it must be found exactly once.
1105  *
1106  * - the config file is mmap()ed and the part before the match (if any) is
1107  *   written to the lock file, then the changed part and the rest.
1108  *
1109  * - the config file is removed and the lock file rename()d to it.
1110  *
1111  */
1112 int git_config_set_multivar(const char *key, const char *value,
1113         const char *value_regex, int multi_replace)
1114 {
1115         int i, dot;
1116         int fd = -1, in_fd;
1117         int ret;
1118         char *config_filename;
1119         struct lock_file *lock = NULL;
1120         const char *last_dot = strrchr(key, '.');
1121
1122         if (config_exclusive_filename)
1123                 config_filename = xstrdup(config_exclusive_filename);
1124         else
1125                 config_filename = git_pathdup("config");
1126
1127         /*
1128          * Since "key" actually contains the section name and the real
1129          * key name separated by a dot, we have to know where the dot is.
1130          */
1131
1132         if (last_dot == NULL) {
1133                 error("key does not contain a section: %s", key);
1134                 ret = 2;
1135                 goto out_free;
1136         }
1137         store.baselen = last_dot - key;
1138
1139         store.multi_replace = multi_replace;
1140
1141         /*
1142          * Validate the key and while at it, lower case it for matching.
1143          */
1144         store.key = xmalloc(strlen(key) + 1);
1145         dot = 0;
1146         for (i = 0; key[i]; i++) {
1147                 unsigned char c = key[i];
1148                 if (c == '.')
1149                         dot = 1;
1150                 /* Leave the extended basename untouched.. */
1151                 if (!dot || i > store.baselen) {
1152                         if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
1153                                 error("invalid key: %s", key);
1154                                 free(store.key);
1155                                 ret = 1;
1156                                 goto out_free;
1157                         }
1158                         c = tolower(c);
1159                 } else if (c == '\n') {
1160                         error("invalid key (newline): %s", key);
1161                         free(store.key);
1162                         ret = 1;
1163                         goto out_free;
1164                 }
1165                 store.key[i] = c;
1166         }
1167         store.key[i] = 0;
1168
1169         /*
1170          * The lock serves a purpose in addition to locking: the new
1171          * contents of .git/config will be written into it.
1172          */
1173         lock = xcalloc(sizeof(struct lock_file), 1);
1174         fd = hold_lock_file_for_update(lock, config_filename, 0);
1175         if (fd < 0) {
1176                 error("could not lock config file %s: %s", config_filename, strerror(errno));
1177                 free(store.key);
1178                 ret = -1;
1179                 goto out_free;
1180         }
1181
1182         /*
1183          * If .git/config does not exist yet, write a minimal version.
1184          */
1185         in_fd = open(config_filename, O_RDONLY);
1186         if ( in_fd < 0 ) {
1187                 free(store.key);
1188
1189                 if ( ENOENT != errno ) {
1190                         error("opening %s: %s", config_filename,
1191                               strerror(errno));
1192                         ret = 3; /* same as "invalid config file" */
1193                         goto out_free;
1194                 }
1195                 /* if nothing to unset, error out */
1196                 if (value == NULL) {
1197                         ret = 5;
1198                         goto out_free;
1199                 }
1200
1201                 store.key = (char *)key;
1202                 if (!store_write_section(fd, key) ||
1203                     !store_write_pair(fd, key, value))
1204                         goto write_err_out;
1205         } else {
1206                 struct stat st;
1207                 char *contents;
1208                 size_t contents_sz, copy_begin, copy_end;
1209                 int i, new_line = 0;
1210
1211                 if (value_regex == NULL)
1212                         store.value_regex = NULL;
1213                 else {
1214                         if (value_regex[0] == '!') {
1215                                 store.do_not_match = 1;
1216                                 value_regex++;
1217                         } else
1218                                 store.do_not_match = 0;
1219
1220                         store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1221                         if (regcomp(store.value_regex, value_regex,
1222                                         REG_EXTENDED)) {
1223                                 error("invalid pattern: %s", value_regex);
1224                                 free(store.value_regex);
1225                                 ret = 6;
1226                                 goto out_free;
1227                         }
1228                 }
1229
1230                 store.offset[0] = 0;
1231                 store.state = START;
1232                 store.seen = 0;
1233
1234                 /*
1235                  * After this, store.offset will contain the *end* offset
1236                  * of the last match, or remain at 0 if no match was found.
1237                  * As a side effect, we make sure to transform only a valid
1238                  * existing config file.
1239                  */
1240                 if (git_config_from_file(store_aux, config_filename, NULL)) {
1241                         error("invalid config file %s", config_filename);
1242                         free(store.key);
1243                         if (store.value_regex != NULL) {
1244                                 regfree(store.value_regex);
1245                                 free(store.value_regex);
1246                         }
1247                         ret = 3;
1248                         goto out_free;
1249                 }
1250
1251                 free(store.key);
1252                 if (store.value_regex != NULL) {
1253                         regfree(store.value_regex);
1254                         free(store.value_regex);
1255                 }
1256
1257                 /* if nothing to unset, or too many matches, error out */
1258                 if ((store.seen == 0 && value == NULL) ||
1259                                 (store.seen > 1 && multi_replace == 0)) {
1260                         ret = 5;
1261                         goto out_free;
1262                 }
1263
1264                 fstat(in_fd, &st);
1265                 contents_sz = xsize_t(st.st_size);
1266                 contents = xmmap(NULL, contents_sz, PROT_READ,
1267                         MAP_PRIVATE, in_fd, 0);
1268                 close(in_fd);
1269
1270                 if (store.seen == 0)
1271                         store.seen = 1;
1272
1273                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1274                         if (store.offset[i] == 0) {
1275                                 store.offset[i] = copy_end = contents_sz;
1276                         } else if (store.state != KEY_SEEN) {
1277                                 copy_end = store.offset[i];
1278                         } else
1279                                 copy_end = find_beginning_of_line(
1280                                         contents, contents_sz,
1281                                         store.offset[i]-2, &new_line);
1282
1283                         if (copy_end > 0 && contents[copy_end-1] != '\n')
1284                                 new_line = 1;
1285
1286                         /* write the first part of the config */
1287                         if (copy_end > copy_begin) {
1288                                 if (write_in_full(fd, contents + copy_begin,
1289                                                   copy_end - copy_begin) <
1290                                     copy_end - copy_begin)
1291                                         goto write_err_out;
1292                                 if (new_line &&
1293                                     write_str_in_full(fd, "\n") != 1)
1294                                         goto write_err_out;
1295                         }
1296                         copy_begin = store.offset[i];
1297                 }
1298
1299                 /* write the pair (value == NULL means unset) */
1300                 if (value != NULL) {
1301                         if (store.state == START) {
1302                                 if (!store_write_section(fd, key))
1303                                         goto write_err_out;
1304                         }
1305                         if (!store_write_pair(fd, key, value))
1306                                 goto write_err_out;
1307                 }
1308
1309                 /* write the rest of the config */
1310                 if (copy_begin < contents_sz)
1311                         if (write_in_full(fd, contents + copy_begin,
1312                                           contents_sz - copy_begin) <
1313                             contents_sz - copy_begin)
1314                                 goto write_err_out;
1315
1316                 munmap(contents, contents_sz);
1317         }
1318
1319         if (commit_lock_file(lock) < 0) {
1320                 error("could not commit config file %s", config_filename);
1321                 ret = 4;
1322                 goto out_free;
1323         }
1324
1325         /*
1326          * lock is committed, so don't try to roll it back below.
1327          * NOTE: Since lockfile.c keeps a linked list of all created
1328          * lock_file structures, it isn't safe to free(lock).  It's
1329          * better to just leave it hanging around.
1330          */
1331         lock = NULL;
1332         ret = 0;
1333
1334 out_free:
1335         if (lock)
1336                 rollback_lock_file(lock);
1337         free(config_filename);
1338         return ret;
1339
1340 write_err_out:
1341         ret = write_error(lock->filename);
1342         goto out_free;
1343
1344 }
1345
1346 static int section_name_match (const char *buf, const char *name)
1347 {
1348         int i = 0, j = 0, dot = 0;
1349         if (buf[i] != '[')
1350                 return 0;
1351         for (i = 1; buf[i] && buf[i] != ']'; i++) {
1352                 if (!dot && isspace(buf[i])) {
1353                         dot = 1;
1354                         if (name[j++] != '.')
1355                                 break;
1356                         for (i++; isspace(buf[i]); i++)
1357                                 ; /* do nothing */
1358                         if (buf[i] != '"')
1359                                 break;
1360                         continue;
1361                 }
1362                 if (buf[i] == '\\' && dot)
1363                         i++;
1364                 else if (buf[i] == '"' && dot) {
1365                         for (i++; isspace(buf[i]); i++)
1366                                 ; /* do_nothing */
1367                         break;
1368                 }
1369                 if (buf[i] != name[j++])
1370                         break;
1371         }
1372         if (buf[i] == ']' && name[j] == 0) {
1373                 /*
1374                  * We match, now just find the right length offset by
1375                  * gobbling up any whitespace after it, as well
1376                  */
1377                 i++;
1378                 for (; buf[i] && isspace(buf[i]); i++)
1379                         ; /* do nothing */
1380                 return i;
1381         }
1382         return 0;
1383 }
1384
1385 /* if new_name == NULL, the section is removed instead */
1386 int git_config_rename_section(const char *old_name, const char *new_name)
1387 {
1388         int ret = 0, remove = 0;
1389         char *config_filename;
1390         struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1391         int out_fd;
1392         char buf[1024];
1393
1394         if (config_exclusive_filename)
1395                 config_filename = xstrdup(config_exclusive_filename);
1396         else
1397                 config_filename = git_pathdup("config");
1398         out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1399         if (out_fd < 0) {
1400                 ret = error("could not lock config file %s", config_filename);
1401                 goto out;
1402         }
1403
1404         if (!(config_file = fopen(config_filename, "rb"))) {
1405                 /* no config file means nothing to rename, no error */
1406                 goto unlock_and_out;
1407         }
1408
1409         while (fgets(buf, sizeof(buf), config_file)) {
1410                 int i;
1411                 int length;
1412                 char *output = buf;
1413                 for (i = 0; buf[i] && isspace(buf[i]); i++)
1414                         ; /* do nothing */
1415                 if (buf[i] == '[') {
1416                         /* it's a section */
1417                         int offset = section_name_match(&buf[i], old_name);
1418                         if (offset > 0) {
1419                                 ret++;
1420                                 if (new_name == NULL) {
1421                                         remove = 1;
1422                                         continue;
1423                                 }
1424                                 store.baselen = strlen(new_name);
1425                                 if (!store_write_section(out_fd, new_name)) {
1426                                         ret = write_error(lock->filename);
1427                                         goto out;
1428                                 }
1429                                 /*
1430                                  * We wrote out the new section, with
1431                                  * a newline, now skip the old
1432                                  * section's length
1433                                  */
1434                                 output += offset + i;
1435                                 if (strlen(output) > 0) {
1436                                         /*
1437                                          * More content means there's
1438                                          * a declaration to put on the
1439                                          * next line; indent with a
1440                                          * tab
1441                                          */
1442                                         output -= 1;
1443                                         output[0] = '\t';
1444                                 }
1445                         }
1446                         remove = 0;
1447                 }
1448                 if (remove)
1449                         continue;
1450                 length = strlen(output);
1451                 if (write_in_full(out_fd, output, length) != length) {
1452                         ret = write_error(lock->filename);
1453                         goto out;
1454                 }
1455         }
1456         fclose(config_file);
1457  unlock_and_out:
1458         if (commit_lock_file(lock) < 0)
1459                 ret = error("could not commit config file %s", config_filename);
1460  out:
1461         free(config_filename);
1462         return ret;
1463 }
1464
1465 /*
1466  * Call this to report error for your variable that should not
1467  * get a boolean value (i.e. "[my] var" means "true").
1468  */
1469 int config_error_nonbool(const char *var)
1470 {
1471         return error("Missing value for '%s'", var);
1472 }