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 int git_config_maybe_bool(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_bool_or_int(const char *name, const char *value, int *is_bool)
 431 {
 432         int v = git_config_maybe_bool(name, value);
 433         if (0 <= v) {
 434                 *is_bool = 1;
 435                 return v;
 436         }
 437         *is_bool = 0;
 438         return git_config_int(name, value);
 439 }
 440
 441 int git_config_bool(const char *name, const char *value)
 442 {
 443         int discard;
 444         return !!git_config_bool_or_int(name, value, &discard);
 445 }
 446
 447 int git_config_string(const char **dest, const char *var, const char *value)
 448 {
 449         if (!value)
 450                 return config_error_nonbool(var);
 451         *dest = xstrdup(value);
 452         return 0;
 453 }
 454
 455 int git_config_pathname(const char **dest, const char *var, const char *value)
 456 {
 457         if (!value)
 458                 return config_error_nonbool(var);
 459         *dest = expand_user_path(value);
 460         if (!*dest)
 461                 die("Failed to expand user dir in: '%s'", value);
 462         return 0;
 463 }
 464
 465 static int git_default_core_config(const char *var, const char *value)
 466 {
 467         /* This needs a better name */
 468         if (!strcmp(var, "core.filemode")) {
 469                 trust_executable_bit = git_config_bool(var, value);
 470                 return 0;
 471         }
 472         if (!strcmp(var, "core.trustctime")) {
 473                 trust_ctime = git_config_bool(var, value);
 474                 return 0;
 475         }
 476
 477         if (!strcmp(var, "core.quotepath")) {
 478                 quote_path_fully = git_config_bool(var, value);
 479                 return 0;
 480         }
 481
 482         if (!strcmp(var, "core.symlinks")) {
 483                 has_symlinks = git_config_bool(var, value);
 484                 return 0;
 485         }
 486
 487         if (!strcmp(var, "core.ignorecase")) {
 488                 ignore_case = git_config_bool(var, value);
 489                 return 0;
 490         }
 491
 492         if (!strcmp(var, "core.bare")) {
 493                 is_bare_repository_cfg = git_config_bool(var, value);
 494                 return 0;
 495         }
 496
 497         if (!strcmp(var, "core.ignorestat")) {
 498                 assume_unchanged = git_config_bool(var, value);
 499                 return 0;
 500         }
 501
 502         if (!strcmp(var, "core.prefersymlinkrefs")) {
 503                 prefer_symlink_refs = git_config_bool(var, value);
 504                 return 0;
 505         }
 506
 507         if (!strcmp(var, "core.logallrefupdates")) {
 508                 log_all_ref_updates = git_config_bool(var, value);
 509                 return 0;
 510         }
 511
 512         if (!strcmp(var, "core.warnambiguousrefs")) {
 513                 warn_ambiguous_refs = git_config_bool(var, value);
 514                 return 0;
 515         }
 516
 517         if (!strcmp(var, "core.loosecompression")) {
 518                 int level = git_config_int(var, value);
 519                 if (level == -1)
 520                         level = Z_DEFAULT_COMPRESSION;
 521                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 522                         die("bad zlib compression level %d", level);
 523                 zlib_compression_level = level;
 524                 zlib_compression_seen = 1;
 525                 return 0;
 526         }
 527
 528         if (!strcmp(var, "core.compression")) {
 529                 int level = git_config_int(var, value);
 530                 if (level == -1)
 531                         level = Z_DEFAULT_COMPRESSION;
 532                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 533                         die("bad zlib compression level %d", level);
 534                 core_compression_level = level;
 535                 core_compression_seen = 1;
 536                 if (!zlib_compression_seen)
 537                         zlib_compression_level = level;
 538                 return 0;
 539         }
 540
 541         if (!strcmp(var, "core.packedgitwindowsize")) {
 542                 int pgsz_x2 = getpagesize() * 2;
 543                 packed_git_window_size = git_config_int(var, value);
 544
 545                 /* This value must be multiple of (pagesize * 2) */
 546                 packed_git_window_size /= pgsz_x2;
 547                 if (packed_git_window_size < 1)
 548                         packed_git_window_size = 1;
 549                 packed_git_window_size *= pgsz_x2;
 550                 return 0;
 551         }
 552
 553         if (!strcmp(var, "core.packedgitlimit")) {
 554                 packed_git_limit = git_config_int(var, value);
 555                 return 0;
 556         }
 557
 558         if (!strcmp(var, "core.deltabasecachelimit")) {
 559                 delta_base_cache_limit = git_config_int(var, value);
 560                 return 0;
 561         }
 562
 563         if (!strcmp(var, "core.autocrlf")) {
 564                 if (value && !strcasecmp(value, "input")) {
 565                         if (eol == EOL_CRLF)
 566                                 return error("core.autocrlf=input conflicts with core.eol=crlf");
 567                         auto_crlf = AUTO_CRLF_INPUT;
 568                         return 0;
 569                 }
 570                 auto_crlf = git_config_bool(var, value);
 571                 return 0;
 572         }
 573
 574         if (!strcmp(var, "core.safecrlf")) {
 575                 if (value && !strcasecmp(value, "warn")) {
 576                         safe_crlf = SAFE_CRLF_WARN;
 577                         return 0;
 578                 }
 579                 safe_crlf = git_config_bool(var, value);
 580                 return 0;
 581         }
 582
 583         if (!strcmp(var, "core.eol")) {
 584                 if (value && !strcasecmp(value, "lf"))
 585                         eol = EOL_LF;
 586                 else if (value && !strcasecmp(value, "crlf"))
 587                         eol = EOL_CRLF;
 588                 else if (value && !strcasecmp(value, "native"))
 589                         eol = EOL_NATIVE;
 590                 else
 591                         eol = EOL_UNSET;
 592                 if (eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 593                         return error("core.autocrlf=input conflicts with core.eol=crlf");
 594                 return 0;
 595         }
 596
 597         if (!strcmp(var, "core.notesref")) {
 598                 notes_ref_name = xstrdup(value);
 599                 return 0;
 600         }
 601
 602         if (!strcmp(var, "core.pager"))
 603                 return git_config_string(&pager_program, var, value);
 604
 605         if (!strcmp(var, "core.editor"))
 606                 return git_config_string(&editor_program, var, value);
 607
 608         if (!strcmp(var, "core.askpass"))
 609                 return git_config_string(&askpass_program, var, value);
 610
 611         if (!strcmp(var, "core.excludesfile"))
 612                 return git_config_pathname(&excludes_file, var, value);
 613
 614         if (!strcmp(var, "core.whitespace")) {
 615                 if (!value)
 616                         return config_error_nonbool(var);
 617                 whitespace_rule_cfg = parse_whitespace_rule(value);
 618                 return 0;
 619         }
 620
 621         if (!strcmp(var, "core.fsyncobjectfiles")) {
 622                 fsync_object_files = git_config_bool(var, value);
 623                 return 0;
 624         }
 625
 626         if (!strcmp(var, "core.preloadindex")) {
 627                 core_preload_index = git_config_bool(var, value);
 628                 return 0;
 629         }
 630
 631         if (!strcmp(var, "core.createobject")) {
 632                 if (!strcmp(value, "rename"))
 633                         object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 634                 else if (!strcmp(value, "link"))
 635                         object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 636                 else
 637                         die("Invalid mode for object creation: %s", value);
 638                 return 0;
 639         }
 640
 641         if (!strcmp(var, "core.sparsecheckout")) {
 642                 core_apply_sparse_checkout = git_config_bool(var, value);
 643                 return 0;
 644         }
 645
 646         if (!strcmp(var, "core.hidedotfiles")) {
 647                 if (value && !strcasecmp(value, "dotgitonly")) {
 648                         hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
 649                         return 0;
 650                 }
 651                 hide_dotfiles = git_config_bool(var, value);
 652                 return 0;
 653         }
 654
 655         /* Add other config variables here and to Documentation/config.txt. */
 656         return 0;
 657 }
 658
 659 static int git_default_user_config(const char *var, const char *value)
 660 {
 661         if (!strcmp(var, "user.name")) {
 662                 if (!value)
 663                         return config_error_nonbool(var);
 664                 strlcpy(git_default_name, value, sizeof(git_default_name));
 665                 user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 666                 return 0;
 667         }
 668
 669         if (!strcmp(var, "user.email")) {
 670                 if (!value)
 671                         return config_error_nonbool(var);
 672                 strlcpy(git_default_email, value, sizeof(git_default_email));
 673                 user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 674                 return 0;
 675         }
 676
 677         /* Add other config variables here and to Documentation/config.txt. */
 678         return 0;
 679 }
 680
 681 static int git_default_i18n_config(const char *var, const char *value)
 682 {
 683         if (!strcmp(var, "i18n.commitencoding"))
 684                 return git_config_string(&git_commit_encoding, var, value);
 685
 686         if (!strcmp(var, "i18n.logoutputencoding"))
 687                 return git_config_string(&git_log_output_encoding, var, value);
 688
 689         /* Add other config variables here and to Documentation/config.txt. */
 690         return 0;
 691 }
 692
 693 static int git_default_branch_config(const char *var, const char *value)
 694 {
 695         if (!strcmp(var, "branch.autosetupmerge")) {
 696                 if (value && !strcasecmp(value, "always")) {
 697                         git_branch_track = BRANCH_TRACK_ALWAYS;
 698                         return 0;
 699                 }
 700                 git_branch_track = git_config_bool(var, value);
 701                 return 0;
 702         }
 703         if (!strcmp(var, "branch.autosetuprebase")) {
 704                 if (!value)
 705                         return config_error_nonbool(var);
 706                 else if (!strcmp(value, "never"))
 707                         autorebase = AUTOREBASE_NEVER;
 708                 else if (!strcmp(value, "local"))
 709                         autorebase = AUTOREBASE_LOCAL;
 710                 else if (!strcmp(value, "remote"))
 711                         autorebase = AUTOREBASE_REMOTE;
 712                 else if (!strcmp(value, "always"))
 713                         autorebase = AUTOREBASE_ALWAYS;
 714                 else
 715                         return error("Malformed value for %s", var);
 716                 return 0;
 717         }
 718
 719         /* Add other config variables here and to Documentation/config.txt. */
 720         return 0;
 721 }
 722
 723 static int git_default_push_config(const char *var, const char *value)
 724 {
 725         if (!strcmp(var, "push.default")) {
 726                 if (!value)
 727                         return config_error_nonbool(var);
 728                 else if (!strcmp(value, "nothing"))
 729                         push_default = PUSH_DEFAULT_NOTHING;
 730                 else if (!strcmp(value, "matching"))
 731                         push_default = PUSH_DEFAULT_MATCHING;
 732                 else if (!strcmp(value, "tracking"))
 733                         push_default = PUSH_DEFAULT_TRACKING;
 734                 else if (!strcmp(value, "current"))
 735                         push_default = PUSH_DEFAULT_CURRENT;
 736                 else {
 737                         error("Malformed value for %s: %s", var, value);
 738                         return error("Must be one of nothing, matching, "
 739                                      "tracking or current.");
 740                 }
 741                 return 0;
 742         }
 743
 744         /* Add other config variables here and to Documentation/config.txt. */
 745         return 0;
 746 }
 747
 748 static int git_default_mailmap_config(const char *var, const char *value)
 749 {
 750         if (!strcmp(var, "mailmap.file"))
 751                 return git_config_string(&git_mailmap_file, var, value);
 752
 753         /* Add other config variables here and to Documentation/config.txt. */
 754         return 0;
 755 }
 756
 757 int git_default_config(const char *var, const char *value, void *dummy)
 758 {
 759         if (!prefixcmp(var, "core."))
 760                 return git_default_core_config(var, value);
 761
 762         if (!prefixcmp(var, "user."))
 763                 return git_default_user_config(var, value);
 764
 765         if (!prefixcmp(var, "i18n."))
 766                 return git_default_i18n_config(var, value);
 767
 768         if (!prefixcmp(var, "branch."))
 769                 return git_default_branch_config(var, value);
 770
 771         if (!prefixcmp(var, "push."))
 772                 return git_default_push_config(var, value);
 773
 774         if (!prefixcmp(var, "mailmap."))
 775                 return git_default_mailmap_config(var, value);
 776
 777         if (!prefixcmp(var, "advice."))
 778                 return git_default_advice_config(var, value);
 779
 780         if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 781                 pager_use_color = git_config_bool(var,value);
 782                 return 0;
 783         }
 784
 785         /* Add other config variables here and to Documentation/config.txt. */
 786         return 0;
 787 }
 788
 789 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 790 {
 791         int ret;
 792         FILE *f = fopen(filename, "r");
 793
 794         ret = -1;
 795         if (f) {
 796                 config_file = f;
 797                 config_file_name = filename;
 798                 config_linenr = 1;
 799                 config_file_eof = 0;
 800                 ret = git_parse_file(fn, data);
 801                 fclose(f);
 802                 config_file_name = NULL;
 803         }
 804         return ret;
 805 }
 806
 807 const char *git_etc_gitconfig(void)
 808 {
 809         static const char *system_wide;
 810         if (!system_wide)
 811                 system_wide = system_path(ETC_GITCONFIG);
 812         return system_wide;
 813 }
 814
 815 int git_env_bool(const char *k, int def)
 816 {
 817         const char *v = getenv(k);
 818         return v ? git_config_bool(k, v) : def;
 819 }
 820
 821 int git_config_system(void)
 822 {
 823         return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 824 }
 825
 826 int git_config_global(void)
 827 {
 828         return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
 829 }
 830
 831 int git_config_from_parameters(config_fn_t fn, void *data)
 832 {
 833         static int loaded_environment;
 834         const struct config_item *ct;
 835
 836         if (!loaded_environment) {
 837                 if (git_config_parse_environment() < 0)
 838                         return -1;
 839                 loaded_environment = 1;
 840         }
 841         for (ct = config_parameters; ct; ct = ct->next)
 842                 if (fn(ct->name, ct->value, data) < 0)
 843                         return -1;
 844         return 0;
 845 }
 846
 847 int git_config(config_fn_t fn, void *data)
 848 {
 849         int ret = 0, found = 0;
 850         char *repo_config = NULL;
 851         const char *home = NULL;
 852
 853         /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
 854         if (config_exclusive_filename)
 855                 return git_config_from_file(fn, config_exclusive_filename, data);
 856         if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 857                 ret += git_config_from_file(fn, git_etc_gitconfig(),
 858                                             data);
 859                 found += 1;
 860         }
 861
 862         home = getenv("HOME");
 863         if (git_config_global() && home) {
 864                 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
 865                 if (!access(user_config, R_OK)) {
 866                         ret += git_config_from_file(fn, user_config, data);
 867                         found += 1;
 868                 }
 869                 free(user_config);
 870         }
 871
 872         repo_config = git_pathdup("config");
 873         if (!access(repo_config, R_OK)) {
 874                 ret += git_config_from_file(fn, repo_config, data);
 875                 found += 1;
 876         }
 877         free(repo_config);
 878
 879         ret += git_config_from_parameters(fn, data);
 880         if (config_parameters)
 881                 found += 1;
 882
 883         if (found == 0)
 884                 return -1;
 885         return ret;
 886 }
 887
 888 /*
 889  * Find all the stuff for git_config_set() below.
 890  */
 891
 892 #define MAX_MATCHES 512
 893
 894 static struct {
 895         int baselen;
 896         char *key;
 897         int do_not_match;
 898         regex_t *value_regex;
 899         int multi_replace;
 900         size_t offset[MAX_MATCHES];
 901         enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 902         int seen;
 903 } store;
 904
 905 static int matches(const char *key, const char *value)
 906 {
 907         return !strcmp(key, store.key) &&
 908                 (store.value_regex == NULL ||
 909                  (store.do_not_match ^
 910                   !regexec(store.value_regex, value, 0, NULL, 0)));
 911 }
 912
 913 static int store_aux(const char *key, const char *value, void *cb)
 914 {
 915         const char *ep;
 916         size_t section_len;
 917
 918         switch (store.state) {
 919         case KEY_SEEN:
 920                 if (matches(key, value)) {
 921                         if (store.seen == 1 && store.multi_replace == 0) {
 922                                 warning("%s has multiple values", key);
 923                         } else if (store.seen >= MAX_MATCHES) {
 924                                 error("too many matches for %s", key);
 925                                 return 1;
 926                         }
 927
 928                         store.offset[store.seen] = ftell(config_file);
 929                         store.seen++;
 930                 }
 931                 break;
 932         case SECTION_SEEN:
 933                 /*
 934                  * What we are looking for is in store.key (both
 935                  * section and var), and its section part is baselen
 936                  * long.  We found key (again, both section and var).
 937                  * We would want to know if this key is in the same
 938                  * section as what we are looking for.  We already
 939                  * know we are in the same section as what should
 940                  * hold store.key.
 941                  */
 942                 ep = strrchr(key, '.');
 943                 section_len = ep - key;
 944
 945                 if ((section_len != store.baselen) ||
 946                     memcmp(key, store.key, section_len+1)) {
 947                         store.state = SECTION_END_SEEN;
 948                         break;
 949                 }
 950
 951                 /*
 952                  * Do not increment matches: this is no match, but we
 953                  * just made sure we are in the desired section.
 954                  */
 955                 store.offset[store.seen] = ftell(config_file);
 956                 /* fallthru */
 957         case SECTION_END_SEEN:
 958         case START:
 959                 if (matches(key, value)) {
 960                         store.offset[store.seen] = ftell(config_file);
 961                         store.state = KEY_SEEN;
 962                         store.seen++;
 963                 } else {
 964                         if (strrchr(key, '.') - key == store.baselen &&
 965                               !strncmp(key, store.key, store.baselen)) {
 966                                         store.state = SECTION_SEEN;
 967                                         store.offset[store.seen] = ftell(config_file);
 968                         }
 969                 }
 970         }
 971         return 0;
 972 }
 973
 974 static int write_error(const char *filename)
 975 {
 976         error("failed to write new configuration file %s", filename);
 977
 978         /* Same error code as "failed to rename". */
 979         return 4;
 980 }
 981
 982 static int store_write_section(int fd, const char *key)
 983 {
 984         const char *dot;
 985         int i, success;
 986         struct strbuf sb = STRBUF_INIT;
 987
 988         dot = memchr(key, '.', store.baselen);
 989         if (dot) {
 990                 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
 991                 for (i = dot - key + 1; i < store.baselen; i++) {
 992                         if (key[i] == '"' || key[i] == '\\')
 993                                 strbuf_addch(&sb, '\\');
 994                         strbuf_addch(&sb, key[i]);
 995                 }
 996                 strbuf_addstr(&sb, "\"]\n");
 997         } else {
 998                 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
 999         }
1000
1001         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1002         strbuf_release(&sb);
1003
1004         return success;
1005 }
1006
1007 static int store_write_pair(int fd, const char *key, const char *value)
1008 {
1009         int i, success;
1010         int length = strlen(key + store.baselen + 1);
1011         const char *quote = "";
1012         struct strbuf sb = STRBUF_INIT;
1013
1014         /*
1015          * Check to see if the value needs to be surrounded with a dq pair.
1016          * Note that problematic characters are always backslash-quoted; this
1017          * check is about not losing leading or trailing SP and strings that
1018          * follow beginning-of-comment characters (i.e. ';' and '#') by the
1019          * configuration parser.
1020          */
1021         if (value[0] == ' ')
1022                 quote = "\"";
1023         for (i = 0; value[i]; i++)
1024                 if (value[i] == ';' || value[i] == '#')
1025                         quote = "\"";
1026         if (i && value[i - 1] == ' ')
1027                 quote = "\"";
1028
1029         strbuf_addf(&sb, "\t%.*s = %s",
1030                     length, key + store.baselen + 1, quote);
1031
1032         for (i = 0; value[i]; i++)
1033                 switch (value[i]) {
1034                 case '\n':
1035                         strbuf_addstr(&sb, "\\n");
1036                         break;
1037                 case '\t':
1038                         strbuf_addstr(&sb, "\\t");
1039                         break;
1040                 case '"':
1041                 case '\\':
1042                         strbuf_addch(&sb, '\\');
1043                 default:
1044                         strbuf_addch(&sb, value[i]);
1045                         break;
1046                 }
1047         strbuf_addf(&sb, "%s\n", quote);
1048
1049         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1050         strbuf_release(&sb);
1051
1052         return success;
1053 }
1054
1055 static ssize_t find_beginning_of_line(const char *contents, size_t size,
1056         size_t offset_, int *found_bracket)
1057 {
1058         size_t equal_offset = size, bracket_offset = size;
1059         ssize_t offset;
1060
1061 contline:
1062         for (offset = offset_-2; offset > 0
1063                         && contents[offset] != '\n'; offset--)
1064                 switch (contents[offset]) {
1065                         case '=': equal_offset = offset; break;
1066                         case ']': bracket_offset = offset; break;
1067                 }
1068         if (offset > 0 && contents[offset-1] == '\\') {
1069                 offset_ = offset;
1070                 goto contline;
1071         }
1072         if (bracket_offset < equal_offset) {
1073                 *found_bracket = 1;
1074                 offset = bracket_offset+1;
1075         } else
1076                 offset++;
1077
1078         return offset;
1079 }
1080
1081 int git_config_set(const char *key, const char *value)
1082 {
1083         return git_config_set_multivar(key, value, NULL, 0);
1084 }
1085
1086 /*
1087  * If value==NULL, unset in (remove from) config,
1088  * if value_regex!=NULL, disregard key/value pairs where value does not match.
1089  * if multi_replace==0, nothing, or only one matching key/value is replaced,
1090  *     else all matching key/values (regardless how many) are removed,
1091  *     before the new pair is written.
1092  *
1093  * Returns 0 on success.
1094  *
1095  * This function does this:
1096  *
1097  * - it locks the config file by creating ".git/config.lock"
1098  *
1099  * - it then parses the config using store_aux() as validator to find
1100  *   the position on the key/value pair to replace. If it is to be unset,
1101  *   it must be found exactly once.
1102  *
1103  * - the config file is mmap()ed and the part before the match (if any) is
1104  *   written to the lock file, then the changed part and the rest.
1105  *
1106  * - the config file is removed and the lock file rename()d to it.
1107  *
1108  */
1109 int git_config_set_multivar(const char *key, const char *value,
1110         const char *value_regex, int multi_replace)
1111 {
1112         int i, dot;
1113         int fd = -1, in_fd;
1114         int ret;
1115         char *config_filename;
1116         struct lock_file *lock = NULL;
1117         const char *last_dot = strrchr(key, '.');
1118
1119         if (config_exclusive_filename)
1120                 config_filename = xstrdup(config_exclusive_filename);
1121         else
1122                 config_filename = git_pathdup("config");
1123
1124         /*
1125          * Since "key" actually contains the section name and the real
1126          * key name separated by a dot, we have to know where the dot is.
1127          */
1128
1129         if (last_dot == NULL) {
1130                 error("key does not contain a section: %s", key);
1131                 ret = 2;
1132                 goto out_free;
1133         }
1134         store.baselen = last_dot - key;
1135
1136         store.multi_replace = multi_replace;
1137
1138         /*
1139          * Validate the key and while at it, lower case it for matching.
1140          */
1141         store.key = xmalloc(strlen(key) + 1);
1142         dot = 0;
1143         for (i = 0; key[i]; i++) {
1144                 unsigned char c = key[i];
1145                 if (c == '.')
1146                         dot = 1;
1147                 /* Leave the extended basename untouched.. */
1148                 if (!dot || i > store.baselen) {
1149                         if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
1150                                 error("invalid key: %s", key);
1151                                 free(store.key);
1152                                 ret = 1;
1153                                 goto out_free;
1154                         }
1155                         c = tolower(c);
1156                 } else if (c == '\n') {
1157                         error("invalid key (newline): %s", key);
1158                         free(store.key);
1159                         ret = 1;
1160                         goto out_free;
1161                 }
1162                 store.key[i] = c;
1163         }
1164         store.key[i] = 0;
1165
1166         /*
1167          * The lock serves a purpose in addition to locking: the new
1168          * contents of .git/config will be written into it.
1169          */
1170         lock = xcalloc(sizeof(struct lock_file), 1);
1171         fd = hold_lock_file_for_update(lock, config_filename, 0);
1172         if (fd < 0) {
1173                 error("could not lock config file %s: %s", config_filename, strerror(errno));
1174                 free(store.key);
1175                 ret = -1;
1176                 goto out_free;
1177         }
1178
1179         /*
1180          * If .git/config does not exist yet, write a minimal version.
1181          */
1182         in_fd = open(config_filename, O_RDONLY);
1183         if ( in_fd < 0 ) {
1184                 free(store.key);
1185
1186                 if ( ENOENT != errno ) {
1187                         error("opening %s: %s", config_filename,
1188                               strerror(errno));
1189                         ret = 3; /* same as "invalid config file" */
1190                         goto out_free;
1191                 }
1192                 /* if nothing to unset, error out */
1193                 if (value == NULL) {
1194                         ret = 5;
1195                         goto out_free;
1196                 }
1197
1198                 store.key = (char *)key;
1199                 if (!store_write_section(fd, key) ||
1200                     !store_write_pair(fd, key, value))
1201                         goto write_err_out;
1202         } else {
1203                 struct stat st;
1204                 char *contents;
1205                 size_t contents_sz, copy_begin, copy_end;
1206                 int i, new_line = 0;
1207
1208                 if (value_regex == NULL)
1209                         store.value_regex = NULL;
1210                 else {
1211                         if (value_regex[0] == '!') {
1212                                 store.do_not_match = 1;
1213                                 value_regex++;
1214                         } else
1215                                 store.do_not_match = 0;
1216
1217                         store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1218                         if (regcomp(store.value_regex, value_regex,
1219                                         REG_EXTENDED)) {
1220                                 error("invalid pattern: %s", value_regex);
1221                                 free(store.value_regex);
1222                                 ret = 6;
1223                                 goto out_free;
1224                         }
1225                 }
1226
1227                 store.offset[0] = 0;
1228                 store.state = START;
1229                 store.seen = 0;
1230
1231                 /*
1232                  * After this, store.offset will contain the *end* offset
1233                  * of the last match, or remain at 0 if no match was found.
1234                  * As a side effect, we make sure to transform only a valid
1235                  * existing config file.
1236                  */
1237                 if (git_config_from_file(store_aux, config_filename, NULL)) {
1238                         error("invalid config file %s", config_filename);
1239                         free(store.key);
1240                         if (store.value_regex != NULL) {
1241                                 regfree(store.value_regex);
1242                                 free(store.value_regex);
1243                         }
1244                         ret = 3;
1245                         goto out_free;
1246                 }
1247
1248                 free(store.key);
1249                 if (store.value_regex != NULL) {
1250                         regfree(store.value_regex);
1251                         free(store.value_regex);
1252                 }
1253
1254                 /* if nothing to unset, or too many matches, error out */
1255                 if ((store.seen == 0 && value == NULL) ||
1256                                 (store.seen > 1 && multi_replace == 0)) {
1257                         ret = 5;
1258                         goto out_free;
1259                 }
1260
1261                 fstat(in_fd, &st);
1262                 contents_sz = xsize_t(st.st_size);
1263                 contents = xmmap(NULL, contents_sz, PROT_READ,
1264                         MAP_PRIVATE, in_fd, 0);
1265                 close(in_fd);
1266
1267                 if (store.seen == 0)
1268                         store.seen = 1;
1269
1270                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1271                         if (store.offset[i] == 0) {
1272                                 store.offset[i] = copy_end = contents_sz;
1273                         } else if (store.state != KEY_SEEN) {
1274                                 copy_end = store.offset[i];
1275                         } else
1276                                 copy_end = find_beginning_of_line(
1277                                         contents, contents_sz,
1278                                         store.offset[i]-2, &new_line);
1279
1280                         if (copy_end > 0 && contents[copy_end-1] != '\n')
1281                                 new_line = 1;
1282
1283                         /* write the first part of the config */
1284                         if (copy_end > copy_begin) {
1285                                 if (write_in_full(fd, contents + copy_begin,
1286                                                   copy_end - copy_begin) <
1287                                     copy_end - copy_begin)
1288                                         goto write_err_out;
1289                                 if (new_line &&
1290                                     write_str_in_full(fd, "\n") != 1)
1291                                         goto write_err_out;
1292                         }
1293                         copy_begin = store.offset[i];
1294                 }
1295
1296                 /* write the pair (value == NULL means unset) */
1297                 if (value != NULL) {
1298                         if (store.state == START) {
1299                                 if (!store_write_section(fd, key))
1300                                         goto write_err_out;
1301                         }
1302                         if (!store_write_pair(fd, key, value))
1303                                 goto write_err_out;
1304                 }
1305
1306                 /* write the rest of the config */
1307                 if (copy_begin < contents_sz)
1308                         if (write_in_full(fd, contents + copy_begin,
1309                                           contents_sz - copy_begin) <
1310                             contents_sz - copy_begin)
1311                                 goto write_err_out;
1312
1313                 munmap(contents, contents_sz);
1314         }
1315
1316         if (commit_lock_file(lock) < 0) {
1317                 error("could not commit config file %s", config_filename);
1318                 ret = 4;
1319                 goto out_free;
1320         }
1321
1322         /*
1323          * lock is committed, so don't try to roll it back below.
1324          * NOTE: Since lockfile.c keeps a linked list of all created
1325          * lock_file structures, it isn't safe to free(lock).  It's
1326          * better to just leave it hanging around.
1327          */
1328         lock = NULL;
1329         ret = 0;
1330
1331 out_free:
1332         if (lock)
1333                 rollback_lock_file(lock);
1334         free(config_filename);
1335         return ret;
1336
1337 write_err_out:
1338         ret = write_error(lock->filename);
1339         goto out_free;
1340
1341 }
1342
1343 static int section_name_match (const char *buf, const char *name)
1344 {
1345         int i = 0, j = 0, dot = 0;
1346         if (buf[i] != '[')
1347                 return 0;
1348         for (i = 1; buf[i] && buf[i] != ']'; i++) {
1349                 if (!dot && isspace(buf[i])) {
1350                         dot = 1;
1351                         if (name[j++] != '.')
1352                                 break;
1353                         for (i++; isspace(buf[i]); i++)
1354                                 ; /* do nothing */
1355                         if (buf[i] != '"')
1356                                 break;
1357                         continue;
1358                 }
1359                 if (buf[i] == '\\' && dot)
1360                         i++;
1361                 else if (buf[i] == '"' && dot) {
1362                         for (i++; isspace(buf[i]); i++)
1363                                 ; /* do_nothing */
1364                         break;
1365                 }
1366                 if (buf[i] != name[j++])
1367                         break;
1368         }
1369         if (buf[i] == ']' && name[j] == 0) {
1370                 /*
1371                  * We match, now just find the right length offset by
1372                  * gobbling up any whitespace after it, as well
1373                  */
1374                 i++;
1375                 for (; buf[i] && isspace(buf[i]); i++)
1376                         ; /* do nothing */
1377                 return i;
1378         }
1379         return 0;
1380 }
1381
1382 /* if new_name == NULL, the section is removed instead */
1383 int git_config_rename_section(const char *old_name, const char *new_name)
1384 {
1385         int ret = 0, remove = 0;
1386         char *config_filename;
1387         struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1388         int out_fd;
1389         char buf[1024];
1390
1391         if (config_exclusive_filename)
1392                 config_filename = xstrdup(config_exclusive_filename);
1393         else
1394                 config_filename = git_pathdup("config");
1395         out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1396         if (out_fd < 0) {
1397                 ret = error("could not lock config file %s", config_filename);
1398                 goto out;
1399         }
1400
1401         if (!(config_file = fopen(config_filename, "rb"))) {
1402                 /* no config file means nothing to rename, no error */
1403                 goto unlock_and_out;
1404         }
1405
1406         while (fgets(buf, sizeof(buf), config_file)) {
1407                 int i;
1408                 int length;
1409                 char *output = buf;
1410                 for (i = 0; buf[i] && isspace(buf[i]); i++)
1411                         ; /* do nothing */
1412                 if (buf[i] == '[') {
1413                         /* it's a section */
1414                         int offset = section_name_match(&buf[i], old_name);
1415                         if (offset > 0) {
1416                                 ret++;
1417                                 if (new_name == NULL) {
1418                                         remove = 1;
1419                                         continue;
1420                                 }
1421                                 store.baselen = strlen(new_name);
1422                                 if (!store_write_section(out_fd, new_name)) {
1423                                         ret = write_error(lock->filename);
1424                                         goto out;
1425                                 }
1426                                 /*
1427                                  * We wrote out the new section, with
1428                                  * a newline, now skip the old
1429                                  * section's length
1430                                  */
1431                                 output += offset + i;
1432                                 if (strlen(output) > 0) {
1433                                         /*
1434                                          * More content means there's
1435                                          * a declaration to put on the
1436                                          * next line; indent with a
1437                                          * tab
1438                                          */
1439                                         output -= 1;
1440                                         output[0] = '\t';
1441                                 }
1442                         }
1443                         remove = 0;
1444                 }
1445                 if (remove)
1446                         continue;
1447                 length = strlen(output);
1448                 if (write_in_full(out_fd, output, length) != length) {
1449                         ret = write_error(lock->filename);
1450                         goto out;
1451                 }
1452         }
1453         fclose(config_file);
1454  unlock_and_out:
1455         if (commit_lock_file(lock) < 0)
1456                 ret = error("could not commit config file %s", config_filename);
1457  out:
1458         free(config_filename);
1459         return ret;
1460 }
1461
1462 /*
1463  * Call this to report error for your variable that should not
1464  * get a boolean value (i.e. "[my] var" means "true").
1465  */
1466 int config_error_nonbool(const char *var)
1467 {
1468         return error("Missing value for '%s'", var);
1469 }