config.c

   1 /*
   2  * GIT - The information manager from hell
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  * Copyright (C) Johannes Schindelin, 2005
   6  *
   7  */
   8 #include "cache.h"
   9 #include "exec_cmd.h"
  10 #include "strbuf.h"
  11 #include "quote.h"
  12
  13 #define MAXNAME (256)
  14
  15 static FILE *config_file;
  16 static const char *config_file_name;
  17 static int config_linenr;
  18 static int config_file_eof;
  19 static int zlib_compression_seen;
  20
  21 const char *config_exclusive_filename = NULL;
  22
  23 struct config_item {
  24         struct config_item *next;
  25         char *name;
  26         char *value;
  27 };
  28 static struct config_item *config_parameters;
  29 static struct config_item **config_parameters_tail = &config_parameters;
  30
  31 static void lowercase(char *p)
  32 {
  33         for (; *p; p++)
  34                 *p = tolower(*p);
  35 }
  36
  37 void git_config_push_parameter(const char *text)
  38 {
  39         struct strbuf env = STRBUF_INIT;
  40         const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
  41         if (old) {
  42                 strbuf_addstr(&env, old);
  43                 strbuf_addch(&env, ' ');
  44         }
  45         sq_quote_buf(&env, text);
  46         setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
  47         strbuf_release(&env);
  48 }
  49
  50 int git_config_parse_parameter(const char *text)
  51 {
  52         struct config_item *ct;
  53         struct strbuf tmp = STRBUF_INIT;
  54         struct strbuf **pair;
  55         strbuf_addstr(&tmp, text);
  56         pair = strbuf_split(&tmp, '=');
  57         if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
  58                 strbuf_setlen(pair[0], pair[0]->len - 1);
  59         strbuf_trim(pair[0]);
  60         if (!pair[0]->len) {
  61                 strbuf_list_free(pair);
  62                 return -1;
  63         }
  64         ct = xcalloc(1, sizeof(struct config_item));
  65         ct->name = strbuf_detach(pair[0], NULL);
  66         if (pair[1]) {
  67                 strbuf_trim(pair[1]);
  68                 ct->value = strbuf_detach(pair[1], NULL);
  69         }
  70         strbuf_list_free(pair);
  71         lowercase(ct->name);
  72         *config_parameters_tail = ct;
  73         config_parameters_tail = &ct->next;
  74         return 0;
  75 }
  76
  77 int git_config_parse_environment(void) {
  78         const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
  79         char *envw;
  80         const char **argv = NULL;
  81         int nr = 0, alloc = 0;
  82         int i;
  83
  84         if (!env)
  85                 return 0;
  86         /* sq_dequote will write over it */
  87         envw = xstrdup(env);
  88
  89         if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
  90                 free(envw);
  91                 return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
  92         }
  93
  94         for (i = 0; i < nr; i++) {
  95                 if (git_config_parse_parameter(argv[i]) < 0) {
  96                         error("bogus config parameter: %s", argv[i]);
  97                         free(argv);
  98                         free(envw);
  99                         return -1;
 100                 }
 101         }
 102
 103         free(argv);
 104         free(envw);
 105         return 0;
 106 }
 107
 108 static int get_next_char(void)
 109 {
 110         int c;
 111         FILE *f;
 112
 113         c = '\n';
 114         if ((f = config_file) != NULL) {
 115                 c = fgetc(f);
 116                 if (c == '\r') {
 117                         /* DOS like systems */
 118                         c = fgetc(f);
 119                         if (c != '\n') {
 120                                 ungetc(c, f);
 121                                 c = '\r';
 122                         }
 123                 }
 124                 if (c == '\n')
 125                         config_linenr++;
 126                 if (c == EOF) {
 127                         config_file_eof = 1;
 128                         c = '\n';
 129                 }
 130         }
 131         return c;
 132 }
 133
 134 static char *parse_value(void)
 135 {
 136         static char value[1024];
 137         int quote = 0, comment = 0, len = 0, space = 0;
 138
 139         for (;;) {
 140                 int c = get_next_char();
 141                 if (len >= sizeof(value) - 1)
 142                         return NULL;
 143                 if (c == '\n') {
 144                         if (quote)
 145                                 return NULL;
 146                         value[len] = 0;
 147                         return value;
 148                 }
 149                 if (comment)
 150                         continue;
 151                 if (isspace(c) && !quote) {
 152                         if (len)
 153                                 space++;
 154                         continue;
 155                 }
 156                 if (!quote) {
 157                         if (c == ';' || c == '#') {
 158                                 comment = 1;
 159                                 continue;
 160                         }
 161                 }
 162                 for (; space; space--)
 163                         value[len++] = ' ';
 164                 if (c == '\\') {
 165                         c = get_next_char();
 166                         switch (c) {
 167                         case '\n':
 168                                 continue;
 169                         case 't':
 170                                 c = '\t';
 171                                 break;
 172                         case 'b':
 173                                 c = '\b';
 174                                 break;
 175                         case 'n':
 176                                 c = '\n';
 177                                 break;
 178                         /* Some characters escape as themselves */
 179                         case '\\': case '"':
 180                                 break;
 181                         /* Reject unknown escape sequences */
 182                         default:
 183                                 return NULL;
 184                         }
 185                         value[len++] = c;
 186                         continue;
 187                 }
 188                 if (c == '"') {
 189                         quote = 1-quote;
 190                         continue;
 191                 }
 192                 value[len++] = c;
 193         }
 194 }
 195
 196 static inline int iskeychar(int c)
 197 {
 198         return isalnum(c) || c == '-';
 199 }
 200
 201 static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
 202 {
 203         int c;
 204         char *value;
 205
 206         /* Get the full name */
 207         for (;;) {
 208                 c = get_next_char();
 209                 if (config_file_eof)
 210                         break;
 211                 if (!iskeychar(c))
 212                         break;
 213                 name[len++] = tolower(c);
 214                 if (len >= MAXNAME)
 215                         return -1;
 216         }
 217         name[len] = 0;
 218         while (c == ' ' || c == '\t')
 219                 c = get_next_char();
 220
 221         value = NULL;
 222         if (c != '\n') {
 223                 if (c != '=')
 224                         return -1;
 225                 value = parse_value();
 226                 if (!value)
 227                         return -1;
 228         }
 229         return fn(name, value, data);
 230 }
 231
 232 static int get_extended_base_var(char *name, int baselen, int c)
 233 {
 234         do {
 235                 if (c == '\n')
 236                         return -1;
 237                 c = get_next_char();
 238         } while (isspace(c));
 239
 240         /* We require the format to be '[base "extension"]' */
 241         if (c != '"')
 242                 return -1;
 243         name[baselen++] = '.';
 244
 245         for (;;) {
 246                 int c = get_next_char();
 247                 if (c == '\n')
 248                         return -1;
 249                 if (c == '"')
 250                         break;
 251                 if (c == '\\') {
 252                         c = get_next_char();
 253                         if (c == '\n')
 254                                 return -1;
 255                 }
 256                 name[baselen++] = c;
 257                 if (baselen > MAXNAME / 2)
 258                         return -1;
 259         }
 260
 261         /* Final ']' */
 262         if (get_next_char() != ']')
 263                 return -1;
 264         return baselen;
 265 }
 266
 267 static int get_base_var(char *name)
 268 {
 269         int baselen = 0;
 270
 271         for (;;) {
 272                 int c = get_next_char();
 273                 if (config_file_eof)
 274                         return -1;
 275                 if (c == ']')
 276                         return baselen;
 277                 if (isspace(c))
 278                         return get_extended_base_var(name, baselen, c);
 279                 if (!iskeychar(c) && c != '.')
 280                         return -1;
 281                 if (baselen > MAXNAME / 2)
 282                         return -1;
 283                 name[baselen++] = tolower(c);
 284         }
 285 }
 286
 287 static int git_parse_file(config_fn_t fn, void *data)
 288 {
 289         int comment = 0;
 290         int baselen = 0;
 291         static char var[MAXNAME];
 292
 293         /* U+FEFF Byte Order Mark in UTF8 */
 294         static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 295         const unsigned char *bomptr = utf8_bom;
 296
 297         for (;;) {
 298                 int c = get_next_char();
 299                 if (bomptr && *bomptr) {
 300                         /* We are at the file beginning; skip UTF8-encoded BOM
 301                          * if present. Sane editors won't put this in on their
 302                          * own, but e.g. Windows Notepad will do it happily. */
 303                         if ((unsigned char) c == *bomptr) {
 304                                 bomptr++;
 305                                 continue;
 306                         } else {
 307                                 /* Do not tolerate partial BOM. */
 308                                 if (bomptr != utf8_bom)
 309                                         break;
 310                                 /* No BOM at file beginning. Cool. */
 311                                 bomptr = NULL;
 312                         }
 313                 }
 314                 if (c == '\n') {
 315                         if (config_file_eof)
 316                                 return 0;
 317                         comment = 0;
 318                         continue;
 319                 }
 320                 if (comment || isspace(c))
 321                         continue;
 322                 if (c == '#' || c == ';') {
 323                         comment = 1;
 324                         continue;
 325                 }
 326                 if (c == '[') {
 327                         baselen = get_base_var(var);
 328                         if (baselen <= 0)
 329                                 break;
 330                         var[baselen++] = '.';
 331                         var[baselen] = 0;
 332                         continue;
 333                 }
 334                 if (!isalpha(c))
 335                         break;
 336                 var[baselen] = tolower(c);
 337                 if (get_value(fn, data, var, baselen+1) < 0)
 338                         break;
 339         }
 340         die("bad config file line %d in %s", config_linenr, config_file_name);
 341 }
 342
 343 static int parse_unit_factor(const char *end, unsigned long *val)
 344 {
 345         if (!*end)
 346                 return 1;
 347         else if (!strcasecmp(end, "k")) {
 348                 *val *= 1024;
 349                 return 1;
 350         }
 351         else if (!strcasecmp(end, "m")) {
 352                 *val *= 1024 * 1024;
 353                 return 1;
 354         }
 355         else if (!strcasecmp(end, "g")) {
 356                 *val *= 1024 * 1024 * 1024;
 357                 return 1;
 358         }
 359         return 0;
 360 }
 361
 362 static int git_parse_long(const char *value, long *ret)
 363 {
 364         if (value && *value) {
 365                 char *end;
 366                 long val = strtol(value, &end, 0);
 367                 unsigned long factor = 1;
 368                 if (!parse_unit_factor(end, &factor))
 369                         return 0;
 370                 *ret = val * factor;
 371                 return 1;
 372         }
 373         return 0;
 374 }
 375
 376 int git_parse_ulong(const char *value, unsigned long *ret)
 377 {
 378         if (value && *value) {
 379                 char *end;
 380                 unsigned long val = strtoul(value, &end, 0);
 381                 if (!parse_unit_factor(end, &val))
 382                         return 0;
 383                 *ret = val;
 384                 return 1;
 385         }
 386         return 0;
 387 }
 388
 389 static void die_bad_config(const char *name)
 390 {
 391         if (config_file_name)
 392                 die("bad config value for '%s' in %s", name, config_file_name);
 393         die("bad config value for '%s'", name);
 394 }
 395
 396 int git_config_int(const char *name, const char *value)
 397 {
 398         long ret = 0;
 399         if (!git_parse_long(value, &ret))
 400                 die_bad_config(name);
 401         return ret;
 402 }
 403
 404 unsigned long git_config_ulong(const char *name, const char *value)
 405 {
 406         unsigned long ret;
 407         if (!git_parse_ulong(value, &ret))
 408                 die_bad_config(name);
 409         return ret;
 410 }
 411
 412 static int git_config_maybe_bool_text(const char *name, const char *value)
 413 {
 414         if (!value)
 415                 return 1;
 416         if (!*value)
 417                 return 0;
 418         if (!strcasecmp(value, "true")
 419             || !strcasecmp(value, "yes")
 420             || !strcasecmp(value, "on"))
 421                 return 1;
 422         if (!strcasecmp(value, "false")
 423             || !strcasecmp(value, "no")
 424             || !strcasecmp(value, "off"))
 425                 return 0;
 426         return -1;
 427 }
 428
 429 int git_config_maybe_bool(const char *name, const char *value)
 430 {
 431         long v = git_config_maybe_bool_text(name, value);
 432         if (0 <= v)
 433                 return v;
 434         if (git_parse_long(value, &v))
 435                 return !!v;
 436         return -1;
 437 }
 438
 439 int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 440 {
 441         int v = git_config_maybe_bool_text(name, value);
 442         if (0 <= v) {
 443                 *is_bool = 1;
 444                 return v;
 445         }
 446         *is_bool = 0;
 447         return git_config_int(name, value);
 448 }
 449
 450 int git_config_bool(const char *name, const char *value)
 451 {
 452         int discard;
 453         return !!git_config_bool_or_int(name, value, &discard);
 454 }
 455
 456 int git_config_string(const char **dest, const char *var, const char *value)
 457 {
 458         if (!value)
 459                 return config_error_nonbool(var);
 460         *dest = xstrdup(value);
 461         return 0;
 462 }
 463
 464 int git_config_pathname(const char **dest, const char *var, const char *value)
 465 {
 466         if (!value)
 467                 return config_error_nonbool(var);
 468         *dest = expand_user_path(value);
 469         if (!*dest)
 470                 die("Failed to expand user dir in: '%s'", value);
 471         return 0;
 472 }
 473
 474 static int git_default_core_config(const char *var, const char *value)
 475 {
 476         /* This needs a better name */
 477         if (!strcmp(var, "core.filemode")) {
 478                 trust_executable_bit = git_config_bool(var, value);
 479                 return 0;
 480         }
 481         if (!strcmp(var, "core.trustctime")) {
 482                 trust_ctime = git_config_bool(var, value);
 483                 return 0;
 484         }
 485
 486         if (!strcmp(var, "core.quotepath")) {
 487                 quote_path_fully = git_config_bool(var, value);
 488                 return 0;
 489         }
 490
 491         if (!strcmp(var, "core.symlinks")) {
 492                 has_symlinks = git_config_bool(var, value);
 493                 return 0;
 494         }
 495
 496         if (!strcmp(var, "core.ignorecase")) {
 497                 ignore_case = git_config_bool(var, value);
 498                 return 0;
 499         }
 500
 501         if (!strcmp(var, "core.bare")) {
 502                 is_bare_repository_cfg = git_config_bool(var, value);
 503                 return 0;
 504         }
 505
 506         if (!strcmp(var, "core.ignorestat")) {
 507                 assume_unchanged = git_config_bool(var, value);
 508                 return 0;
 509         }
 510
 511         if (!strcmp(var, "core.prefersymlinkrefs")) {
 512                 prefer_symlink_refs = git_config_bool(var, value);
 513                 return 0;
 514         }
 515
 516         if (!strcmp(var, "core.logallrefupdates")) {
 517                 log_all_ref_updates = git_config_bool(var, value);
 518                 return 0;
 519         }
 520
 521         if (!strcmp(var, "core.warnambiguousrefs")) {
 522                 warn_ambiguous_refs = git_config_bool(var, value);
 523                 return 0;
 524         }
 525
 526         if (!strcmp(var, "core.abbrev")) {
 527                 int abbrev = git_config_int(var, value);
 528                 if (abbrev < minimum_abbrev || abbrev > 40)
 529                         return -1;
 530                 default_abbrev = abbrev;
 531                 return 0;
 532         }
 533
 534         if (!strcmp(var, "core.loosecompression")) {
 535                 int level = git_config_int(var, value);
 536                 if (level == -1)
 537                         level = Z_DEFAULT_COMPRESSION;
 538                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 539                         die("bad zlib compression level %d", level);
 540                 zlib_compression_level = level;
 541                 zlib_compression_seen = 1;
 542                 return 0;
 543         }
 544
 545         if (!strcmp(var, "core.compression")) {
 546                 int level = git_config_int(var, value);
 547                 if (level == -1)
 548                         level = Z_DEFAULT_COMPRESSION;
 549                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 550                         die("bad zlib compression level %d", level);
 551                 core_compression_level = level;
 552                 core_compression_seen = 1;
 553                 if (!zlib_compression_seen)
 554                         zlib_compression_level = level;
 555                 return 0;
 556         }
 557
 558         if (!strcmp(var, "core.packedgitwindowsize")) {
 559                 int pgsz_x2 = getpagesize() * 2;
 560                 packed_git_window_size = git_config_int(var, value);
 561
 562                 /* This value must be multiple of (pagesize * 2) */
 563                 packed_git_window_size /= pgsz_x2;
 564                 if (packed_git_window_size < 1)
 565                         packed_git_window_size = 1;
 566                 packed_git_window_size *= pgsz_x2;
 567                 return 0;
 568         }
 569
 570         if (!strcmp(var, "core.packedgitlimit")) {
 571                 packed_git_limit = git_config_int(var, value);
 572                 return 0;
 573         }
 574
 575         if (!strcmp(var, "core.deltabasecachelimit")) {
 576                 delta_base_cache_limit = git_config_int(var, value);
 577                 return 0;
 578         }
 579
 580         if (!strcmp(var, "core.autocrlf")) {
 581                 if (value && !strcasecmp(value, "input")) {
 582                         if (eol == EOL_CRLF)
 583                                 return error("core.autocrlf=input conflicts with core.eol=crlf");
 584                         auto_crlf = AUTO_CRLF_INPUT;
 585                         return 0;
 586                 }
 587                 auto_crlf = git_config_bool(var, value);
 588                 return 0;
 589         }
 590
 591         if (!strcmp(var, "core.safecrlf")) {
 592                 if (value && !strcasecmp(value, "warn")) {
 593                         safe_crlf = SAFE_CRLF_WARN;
 594                         return 0;
 595                 }
 596                 safe_crlf = git_config_bool(var, value);
 597                 return 0;
 598         }
 599
 600         if (!strcmp(var, "core.eol")) {
 601                 if (value && !strcasecmp(value, "lf"))
 602                         eol = EOL_LF;
 603                 else if (value && !strcasecmp(value, "crlf"))
 604                         eol = EOL_CRLF;
 605                 else if (value && !strcasecmp(value, "native"))
 606                         eol = EOL_NATIVE;
 607                 else
 608                         eol = EOL_UNSET;
 609                 if (eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 610                         return error("core.autocrlf=input conflicts with core.eol=crlf");
 611                 return 0;
 612         }
 613
 614         if (!strcmp(var, "core.notesref")) {
 615                 notes_ref_name = xstrdup(value);
 616                 return 0;
 617         }
 618
 619         if (!strcmp(var, "core.pager"))
 620                 return git_config_string(&pager_program, var, value);
 621
 622         if (!strcmp(var, "core.editor"))
 623                 return git_config_string(&editor_program, var, value);
 624
 625         if (!strcmp(var, "core.askpass"))
 626                 return git_config_string(&askpass_program, var, value);
 627
 628         if (!strcmp(var, "core.excludesfile"))
 629                 return git_config_pathname(&excludes_file, var, value);
 630
 631         if (!strcmp(var, "core.whitespace")) {
 632                 if (!value)
 633                         return config_error_nonbool(var);
 634                 whitespace_rule_cfg = parse_whitespace_rule(value);
 635                 return 0;
 636         }
 637
 638         if (!strcmp(var, "core.fsyncobjectfiles")) {
 639                 fsync_object_files = git_config_bool(var, value);
 640                 return 0;
 641         }
 642
 643         if (!strcmp(var, "core.preloadindex")) {
 644                 core_preload_index = git_config_bool(var, value);
 645                 return 0;
 646         }
 647
 648         if (!strcmp(var, "core.createobject")) {
 649                 if (!strcmp(value, "rename"))
 650                         object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 651                 else if (!strcmp(value, "link"))
 652                         object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 653                 else
 654                         die("Invalid mode for object creation: %s", value);
 655                 return 0;
 656         }
 657
 658         if (!strcmp(var, "core.sparsecheckout")) {
 659                 core_apply_sparse_checkout = git_config_bool(var, value);
 660                 return 0;
 661         }
 662
 663         /* Add other config variables here and to Documentation/config.txt. */
 664         return 0;
 665 }
 666
 667 static int git_default_user_config(const char *var, const char *value)
 668 {
 669         if (!strcmp(var, "user.name")) {
 670                 if (!value)
 671                         return config_error_nonbool(var);
 672                 strlcpy(git_default_name, value, sizeof(git_default_name));
 673                 user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 674                 return 0;
 675         }
 676
 677         if (!strcmp(var, "user.email")) {
 678                 if (!value)
 679                         return config_error_nonbool(var);
 680                 strlcpy(git_default_email, value, sizeof(git_default_email));
 681                 user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 682                 return 0;
 683         }
 684
 685         /* Add other config variables here and to Documentation/config.txt. */
 686         return 0;
 687 }
 688
 689 static int git_default_i18n_config(const char *var, const char *value)
 690 {
 691         if (!strcmp(var, "i18n.commitencoding"))
 692                 return git_config_string(&git_commit_encoding, var, value);
 693
 694         if (!strcmp(var, "i18n.logoutputencoding"))
 695                 return git_config_string(&git_log_output_encoding, var, value);
 696
 697         /* Add other config variables here and to Documentation/config.txt. */
 698         return 0;
 699 }
 700
 701 static int git_default_branch_config(const char *var, const char *value)
 702 {
 703         if (!strcmp(var, "branch.autosetupmerge")) {
 704                 if (value && !strcasecmp(value, "always")) {
 705                         git_branch_track = BRANCH_TRACK_ALWAYS;
 706                         return 0;
 707                 }
 708                 git_branch_track = git_config_bool(var, value);
 709                 return 0;
 710         }
 711         if (!strcmp(var, "branch.autosetuprebase")) {
 712                 if (!value)
 713                         return config_error_nonbool(var);
 714                 else if (!strcmp(value, "never"))
 715                         autorebase = AUTOREBASE_NEVER;
 716                 else if (!strcmp(value, "local"))
 717                         autorebase = AUTOREBASE_LOCAL;
 718                 else if (!strcmp(value, "remote"))
 719                         autorebase = AUTOREBASE_REMOTE;
 720                 else if (!strcmp(value, "always"))
 721                         autorebase = AUTOREBASE_ALWAYS;
 722                 else
 723                         return error("Malformed value for %s", var);
 724                 return 0;
 725         }
 726
 727         /* Add other config variables here and to Documentation/config.txt. */
 728         return 0;
 729 }
 730
 731 static int git_default_push_config(const char *var, const char *value)
 732 {
 733         if (!strcmp(var, "push.default")) {
 734                 if (!value)
 735                         return config_error_nonbool(var);
 736                 else if (!strcmp(value, "nothing"))
 737                         push_default = PUSH_DEFAULT_NOTHING;
 738                 else if (!strcmp(value, "matching"))
 739                         push_default = PUSH_DEFAULT_MATCHING;
 740                 else if (!strcmp(value, "upstream"))
 741                         push_default = PUSH_DEFAULT_UPSTREAM;
 742                 else if (!strcmp(value, "tracking")) /* deprecated */
 743                         push_default = PUSH_DEFAULT_UPSTREAM;
 744                 else if (!strcmp(value, "current"))
 745                         push_default = PUSH_DEFAULT_CURRENT;
 746                 else {
 747                         error("Malformed value for %s: %s", var, value);
 748                         return error("Must be one of nothing, matching, "
 749                                      "tracking or current.");
 750                 }
 751                 return 0;
 752         }
 753
 754         /* Add other config variables here and to Documentation/config.txt. */
 755         return 0;
 756 }
 757
 758 static int git_default_mailmap_config(const char *var, const char *value)
 759 {
 760         if (!strcmp(var, "mailmap.file"))
 761                 return git_config_string(&git_mailmap_file, var, value);
 762
 763         /* Add other config variables here and to Documentation/config.txt. */
 764         return 0;
 765 }
 766
 767 int git_default_config(const char *var, const char *value, void *dummy)
 768 {
 769         if (!prefixcmp(var, "core."))
 770                 return git_default_core_config(var, value);
 771
 772         if (!prefixcmp(var, "user."))
 773                 return git_default_user_config(var, value);
 774
 775         if (!prefixcmp(var, "i18n."))
 776                 return git_default_i18n_config(var, value);
 777
 778         if (!prefixcmp(var, "branch."))
 779                 return git_default_branch_config(var, value);
 780
 781         if (!prefixcmp(var, "push."))
 782                 return git_default_push_config(var, value);
 783
 784         if (!prefixcmp(var, "mailmap."))
 785                 return git_default_mailmap_config(var, value);
 786
 787         if (!prefixcmp(var, "advice."))
 788                 return git_default_advice_config(var, value);
 789
 790         if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 791                 pager_use_color = git_config_bool(var,value);
 792                 return 0;
 793         }
 794
 795         /* Add other config variables here and to Documentation/config.txt. */
 796         return 0;
 797 }
 798
 799 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 800 {
 801         int ret;
 802         FILE *f = fopen(filename, "r");
 803
 804         ret = -1;
 805         if (f) {
 806                 config_file = f;
 807                 config_file_name = filename;
 808                 config_linenr = 1;
 809                 config_file_eof = 0;
 810                 ret = git_parse_file(fn, data);
 811                 fclose(f);
 812                 config_file_name = NULL;
 813         }
 814         return ret;
 815 }
 816
 817 const char *git_etc_gitconfig(void)
 818 {
 819         static const char *system_wide;
 820         if (!system_wide)
 821                 system_wide = system_path(ETC_GITCONFIG);
 822         return system_wide;
 823 }
 824
 825 int git_env_bool(const char *k, int def)
 826 {
 827         const char *v = getenv(k);
 828         return v ? git_config_bool(k, v) : def;
 829 }
 830
 831 int git_config_system(void)
 832 {
 833         return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 834 }
 835
 836 int git_config_global(void)
 837 {
 838         return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
 839 }
 840
 841 int git_config_from_parameters(config_fn_t fn, void *data)
 842 {
 843         static int loaded_environment;
 844         const struct config_item *ct;
 845
 846         if (!loaded_environment) {
 847                 if (git_config_parse_environment() < 0)
 848                         return -1;
 849                 loaded_environment = 1;
 850         }
 851         for (ct = config_parameters; ct; ct = ct->next)
 852                 if (fn(ct->name, ct->value, data) < 0)
 853                         return -1;
 854         return 0;
 855 }
 856
 857 int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 858 {
 859         int ret = 0, found = 0;
 860         const char *home = NULL;
 861
 862         /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
 863         if (config_exclusive_filename)
 864                 return git_config_from_file(fn, config_exclusive_filename, data);
 865         if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 866                 ret += git_config_from_file(fn, git_etc_gitconfig(),
 867                                             data);
 868                 found += 1;
 869         }
 870
 871         home = getenv("HOME");
 872         if (git_config_global() && home) {
 873                 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
 874                 if (!access(user_config, R_OK)) {
 875                         ret += git_config_from_file(fn, user_config, data);
 876                         found += 1;
 877                 }
 878                 free(user_config);
 879         }
 880
 881         if (repo_config && !access(repo_config, R_OK)) {
 882                 ret += git_config_from_file(fn, repo_config, data);
 883                 found += 1;
 884         }
 885
 886         ret += git_config_from_parameters(fn, data);
 887         if (config_parameters)
 888                 found += 1;
 889
 890         return ret == 0 ? found : ret;
 891 }
 892
 893 int git_config(config_fn_t fn, void *data)
 894 {
 895         char *repo_config = NULL;
 896         int ret;
 897
 898         repo_config = git_pathdup("config");
 899         ret = git_config_early(fn, data, repo_config);
 900         if (repo_config)
 901                 free(repo_config);
 902         return ret;
 903 }
 904
 905 /*
 906  * Find all the stuff for git_config_set() below.
 907  */
 908
 909 #define MAX_MATCHES 512
 910
 911 static struct {
 912         int baselen;
 913         char *key;
 914         int do_not_match;
 915         regex_t *value_regex;
 916         int multi_replace;
 917         size_t offset[MAX_MATCHES];
 918         enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 919         int seen;
 920 } store;
 921
 922 static int matches(const char *key, const char *value)
 923 {
 924         return !strcmp(key, store.key) &&
 925                 (store.value_regex == NULL ||
 926                  (store.do_not_match ^
 927                   !regexec(store.value_regex, value, 0, NULL, 0)));
 928 }
 929
 930 static int store_aux(const char *key, const char *value, void *cb)
 931 {
 932         const char *ep;
 933         size_t section_len;
 934
 935         switch (store.state) {
 936         case KEY_SEEN:
 937                 if (matches(key, value)) {
 938                         if (store.seen == 1 && store.multi_replace == 0) {
 939                                 warning("%s has multiple values", key);
 940                         } else if (store.seen >= MAX_MATCHES) {
 941                                 error("too many matches for %s", key);
 942                                 return 1;
 943                         }
 944
 945                         store.offset[store.seen] = ftell(config_file);
 946                         store.seen++;
 947                 }
 948                 break;
 949         case SECTION_SEEN:
 950                 /*
 951                  * What we are looking for is in store.key (both
 952                  * section and var), and its section part is baselen
 953                  * long.  We found key (again, both section and var).
 954                  * We would want to know if this key is in the same
 955                  * section as what we are looking for.  We already
 956                  * know we are in the same section as what should
 957                  * hold store.key.
 958                  */
 959                 ep = strrchr(key, '.');
 960                 section_len = ep - key;
 961
 962                 if ((section_len != store.baselen) ||
 963                     memcmp(key, store.key, section_len+1)) {
 964                         store.state = SECTION_END_SEEN;
 965                         break;
 966                 }
 967
 968                 /*
 969                  * Do not increment matches: this is no match, but we
 970                  * just made sure we are in the desired section.
 971                  */
 972                 store.offset[store.seen] = ftell(config_file);
 973                 /* fallthru */
 974         case SECTION_END_SEEN:
 975         case START:
 976                 if (matches(key, value)) {
 977                         store.offset[store.seen] = ftell(config_file);
 978                         store.state = KEY_SEEN;
 979                         store.seen++;
 980                 } else {
 981                         if (strrchr(key, '.') - key == store.baselen &&
 982                               !strncmp(key, store.key, store.baselen)) {
 983                                         store.state = SECTION_SEEN;
 984                                         store.offset[store.seen] = ftell(config_file);
 985                         }
 986                 }
 987         }
 988         return 0;
 989 }
 990
 991 static int write_error(const char *filename)
 992 {
 993         error("failed to write new configuration file %s", filename);
 994
 995         /* Same error code as "failed to rename". */
 996         return 4;
 997 }
 998
 999 static int store_write_section(int fd, const char *key)
1000 {
1001         const char *dot;
1002         int i, success;
1003         struct strbuf sb = STRBUF_INIT;
1004
1005         dot = memchr(key, '.', store.baselen);
1006         if (dot) {
1007                 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1008                 for (i = dot - key + 1; i < store.baselen; i++) {
1009                         if (key[i] == '"' || key[i] == '\\')
1010                                 strbuf_addch(&sb, '\\');
1011                         strbuf_addch(&sb, key[i]);
1012                 }
1013                 strbuf_addstr(&sb, "\"]\n");
1014         } else {
1015                 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1016         }
1017
1018         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1019         strbuf_release(&sb);
1020
1021         return success;
1022 }
1023
1024 static int store_write_pair(int fd, const char *key, const char *value)
1025 {
1026         int i, success;
1027         int length = strlen(key + store.baselen + 1);
1028         const char *quote = "";
1029         struct strbuf sb = STRBUF_INIT;
1030
1031         /*
1032          * Check to see if the value needs to be surrounded with a dq pair.
1033          * Note that problematic characters are always backslash-quoted; this
1034          * check is about not losing leading or trailing SP and strings that
1035          * follow beginning-of-comment characters (i.e. ';' and '#') by the
1036          * configuration parser.
1037          */
1038         if (value[0] == ' ')
1039                 quote = "\"";
1040         for (i = 0; value[i]; i++)
1041                 if (value[i] == ';' || value[i] == '#')
1042                         quote = "\"";
1043         if (i && value[i - 1] == ' ')
1044                 quote = "\"";
1045
1046         strbuf_addf(&sb, "\t%.*s = %s",
1047                     length, key + store.baselen + 1, quote);
1048
1049         for (i = 0; value[i]; i++)
1050                 switch (value[i]) {
1051                 case '\n':
1052                         strbuf_addstr(&sb, "\\n");
1053                         break;
1054                 case '\t':
1055                         strbuf_addstr(&sb, "\\t");
1056                         break;
1057                 case '"':
1058                 case '\\':
1059                         strbuf_addch(&sb, '\\');
1060                 default:
1061                         strbuf_addch(&sb, value[i]);
1062                         break;
1063                 }
1064         strbuf_addf(&sb, "%s\n", quote);
1065
1066         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1067         strbuf_release(&sb);
1068
1069         return success;
1070 }
1071
1072 static ssize_t find_beginning_of_line(const char *contents, size_t size,
1073         size_t offset_, int *found_bracket)
1074 {
1075         size_t equal_offset = size, bracket_offset = size;
1076         ssize_t offset;
1077
1078 contline:
1079         for (offset = offset_-2; offset > 0
1080                         && contents[offset] != '\n'; offset--)
1081                 switch (contents[offset]) {
1082                         case '=': equal_offset = offset; break;
1083                         case ']': bracket_offset = offset; break;
1084                 }
1085         if (offset > 0 && contents[offset-1] == '\\') {
1086                 offset_ = offset;
1087                 goto contline;
1088         }
1089         if (bracket_offset < equal_offset) {
1090                 *found_bracket = 1;
1091                 offset = bracket_offset+1;
1092         } else
1093                 offset++;
1094
1095         return offset;
1096 }
1097
1098 int git_config_set(const char *key, const char *value)
1099 {
1100         return git_config_set_multivar(key, value, NULL, 0);
1101 }
1102
1103 /*
1104  * Auxiliary function to sanity-check and split the key into the section
1105  * identifier and variable name.
1106  *
1107  * Returns 0 on success, -1 when there is an invalid character in the key and
1108  * -2 if there is no section name in the key.
1109  *
1110  * store_key - pointer to char* which will hold a copy of the key with
1111  *             lowercase section and variable name
1112  * baselen - pointer to int which will hold the length of the
1113  *           section + subsection part, can be NULL
1114  */
1115 int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1116 {
1117         int i, dot, baselen;
1118         const char *last_dot = strrchr(key, '.');
1119
1120         /*
1121          * Since "key" actually contains the section name and the real
1122          * key name separated by a dot, we have to know where the dot is.
1123          */
1124
1125         if (last_dot == NULL || last_dot == key) {
1126                 error("key does not contain a section: %s", key);
1127                 return -2;
1128         }
1129
1130         if (!last_dot[1]) {
1131                 error("key does not contain variable name: %s", key);
1132                 return -2;
1133         }
1134
1135         baselen = last_dot - key;
1136         if (baselen_)
1137                 *baselen_ = baselen;
1138
1139         /*
1140          * Validate the key and while at it, lower case it for matching.
1141          */
1142         *store_key = xmalloc(strlen(key) + 1);
1143
1144         dot = 0;
1145         for (i = 0; key[i]; i++) {
1146                 unsigned char c = key[i];
1147                 if (c == '.')
1148                         dot = 1;
1149                 /* Leave the extended basename untouched.. */
1150                 if (!dot || i > baselen) {
1151                         if (!iskeychar(c) ||
1152                             (i == baselen + 1 && !isalpha(c))) {
1153                                 error("invalid key: %s", key);
1154                                 goto out_free_ret_1;
1155                         }
1156                         c = tolower(c);
1157                 } else if (c == '\n') {
1158                         error("invalid key (newline): %s", key);
1159                         goto out_free_ret_1;
1160                 }
1161                 (*store_key)[i] = c;
1162         }
1163         (*store_key)[i] = 0;
1164
1165         return 0;
1166
1167 out_free_ret_1:
1168         free(*store_key);
1169         return -1;
1170 }
1171
1172 /*
1173  * If value==NULL, unset in (remove from) config,
1174  * if value_regex!=NULL, disregard key/value pairs where value does not match.
1175  * if multi_replace==0, nothing, or only one matching key/value is replaced,
1176  *     else all matching key/values (regardless how many) are removed,
1177  *     before the new pair is written.
1178  *
1179  * Returns 0 on success.
1180  *
1181  * This function does this:
1182  *
1183  * - it locks the config file by creating ".git/config.lock"
1184  *
1185  * - it then parses the config using store_aux() as validator to find
1186  *   the position on the key/value pair to replace. If it is to be unset,
1187  *   it must be found exactly once.
1188  *
1189  * - the config file is mmap()ed and the part before the match (if any) is
1190  *   written to the lock file, then the changed part and the rest.
1191  *
1192  * - the config file is removed and the lock file rename()d to it.
1193  *
1194  */
1195 int git_config_set_multivar(const char *key, const char *value,
1196         const char *value_regex, int multi_replace)
1197 {
1198         int fd = -1, in_fd;
1199         int ret;
1200         char *config_filename;
1201         struct lock_file *lock = NULL;
1202
1203         if (config_exclusive_filename)
1204                 config_filename = xstrdup(config_exclusive_filename);
1205         else
1206                 config_filename = git_pathdup("config");
1207
1208         /* parse-key returns negative; flip the sign to feed exit(3) */
1209         ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1210         if (ret)
1211                 goto out_free;
1212
1213         store.multi_replace = multi_replace;
1214
1215
1216         /*
1217          * The lock serves a purpose in addition to locking: the new
1218          * contents of .git/config will be written into it.
1219          */
1220         lock = xcalloc(sizeof(struct lock_file), 1);
1221         fd = hold_lock_file_for_update(lock, config_filename, 0);
1222         if (fd < 0) {
1223                 error("could not lock config file %s: %s", config_filename, strerror(errno));
1224                 free(store.key);
1225                 ret = -1;
1226                 goto out_free;
1227         }
1228
1229         /*
1230          * If .git/config does not exist yet, write a minimal version.
1231          */
1232         in_fd = open(config_filename, O_RDONLY);
1233         if ( in_fd < 0 ) {
1234                 free(store.key);
1235
1236                 if ( ENOENT != errno ) {
1237                         error("opening %s: %s", config_filename,
1238                               strerror(errno));
1239                         ret = 3; /* same as "invalid config file" */
1240                         goto out_free;
1241                 }
1242                 /* if nothing to unset, error out */
1243                 if (value == NULL) {
1244                         ret = 5;
1245                         goto out_free;
1246                 }
1247
1248                 store.key = (char *)key;
1249                 if (!store_write_section(fd, key) ||
1250                     !store_write_pair(fd, key, value))
1251                         goto write_err_out;
1252         } else {
1253                 struct stat st;
1254                 char *contents;
1255                 size_t contents_sz, copy_begin, copy_end;
1256                 int i, new_line = 0;
1257
1258                 if (value_regex == NULL)
1259                         store.value_regex = NULL;
1260                 else {
1261                         if (value_regex[0] == '!') {
1262                                 store.do_not_match = 1;
1263                                 value_regex++;
1264                         } else
1265                                 store.do_not_match = 0;
1266
1267                         store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1268                         if (regcomp(store.value_regex, value_regex,
1269                                         REG_EXTENDED)) {
1270                                 error("invalid pattern: %s", value_regex);
1271                                 free(store.value_regex);
1272                                 ret = 6;
1273                                 goto out_free;
1274                         }
1275                 }
1276
1277                 store.offset[0] = 0;
1278                 store.state = START;
1279                 store.seen = 0;
1280
1281                 /*
1282                  * After this, store.offset will contain the *end* offset
1283                  * of the last match, or remain at 0 if no match was found.
1284                  * As a side effect, we make sure to transform only a valid
1285                  * existing config file.
1286                  */
1287                 if (git_config_from_file(store_aux, config_filename, NULL)) {
1288                         error("invalid config file %s", config_filename);
1289                         free(store.key);
1290                         if (store.value_regex != NULL) {
1291                                 regfree(store.value_regex);
1292                                 free(store.value_regex);
1293                         }
1294                         ret = 3;
1295                         goto out_free;
1296                 }
1297
1298                 free(store.key);
1299                 if (store.value_regex != NULL) {
1300                         regfree(store.value_regex);
1301                         free(store.value_regex);
1302                 }
1303
1304                 /* if nothing to unset, or too many matches, error out */
1305                 if ((store.seen == 0 && value == NULL) ||
1306                                 (store.seen > 1 && multi_replace == 0)) {
1307                         ret = 5;
1308                         goto out_free;
1309                 }
1310
1311                 fstat(in_fd, &st);
1312                 contents_sz = xsize_t(st.st_size);
1313                 contents = xmmap(NULL, contents_sz, PROT_READ,
1314                         MAP_PRIVATE, in_fd, 0);
1315                 close(in_fd);
1316
1317                 if (store.seen == 0)
1318                         store.seen = 1;
1319
1320                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1321                         if (store.offset[i] == 0) {
1322                                 store.offset[i] = copy_end = contents_sz;
1323                         } else if (store.state != KEY_SEEN) {
1324                                 copy_end = store.offset[i];
1325                         } else
1326                                 copy_end = find_beginning_of_line(
1327                                         contents, contents_sz,
1328                                         store.offset[i]-2, &new_line);
1329
1330                         if (copy_end > 0 && contents[copy_end-1] != '\n')
1331                                 new_line = 1;
1332
1333                         /* write the first part of the config */
1334                         if (copy_end > copy_begin) {
1335                                 if (write_in_full(fd, contents + copy_begin,
1336                                                   copy_end - copy_begin) <
1337                                     copy_end - copy_begin)
1338                                         goto write_err_out;
1339                                 if (new_line &&
1340                                     write_str_in_full(fd, "\n") != 1)
1341                                         goto write_err_out;
1342                         }
1343                         copy_begin = store.offset[i];
1344                 }
1345
1346                 /* write the pair (value == NULL means unset) */
1347                 if (value != NULL) {
1348                         if (store.state == START) {
1349                                 if (!store_write_section(fd, key))
1350                                         goto write_err_out;
1351                         }
1352                         if (!store_write_pair(fd, key, value))
1353                                 goto write_err_out;
1354                 }
1355
1356                 /* write the rest of the config */
1357                 if (copy_begin < contents_sz)
1358                         if (write_in_full(fd, contents + copy_begin,
1359                                           contents_sz - copy_begin) <
1360                             contents_sz - copy_begin)
1361                                 goto write_err_out;
1362
1363                 munmap(contents, contents_sz);
1364         }
1365
1366         if (commit_lock_file(lock) < 0) {
1367                 error("could not commit config file %s", config_filename);
1368                 ret = 4;
1369                 goto out_free;
1370         }
1371
1372         /*
1373          * lock is committed, so don't try to roll it back below.
1374          * NOTE: Since lockfile.c keeps a linked list of all created
1375          * lock_file structures, it isn't safe to free(lock).  It's
1376          * better to just leave it hanging around.
1377          */
1378         lock = NULL;
1379         ret = 0;
1380
1381 out_free:
1382         if (lock)
1383                 rollback_lock_file(lock);
1384         free(config_filename);
1385         return ret;
1386
1387 write_err_out:
1388         ret = write_error(lock->filename);
1389         goto out_free;
1390
1391 }
1392
1393 static int section_name_match (const char *buf, const char *name)
1394 {
1395         int i = 0, j = 0, dot = 0;
1396         if (buf[i] != '[')
1397                 return 0;
1398         for (i = 1; buf[i] && buf[i] != ']'; i++) {
1399                 if (!dot && isspace(buf[i])) {
1400                         dot = 1;
1401                         if (name[j++] != '.')
1402                                 break;
1403                         for (i++; isspace(buf[i]); i++)
1404                                 ; /* do nothing */
1405                         if (buf[i] != '"')
1406                                 break;
1407                         continue;
1408                 }
1409                 if (buf[i] == '\\' && dot)
1410                         i++;
1411                 else if (buf[i] == '"' && dot) {
1412                         for (i++; isspace(buf[i]); i++)
1413                                 ; /* do_nothing */
1414                         break;
1415                 }
1416                 if (buf[i] != name[j++])
1417                         break;
1418         }
1419         if (buf[i] == ']' && name[j] == 0) {
1420                 /*
1421                  * We match, now just find the right length offset by
1422                  * gobbling up any whitespace after it, as well
1423                  */
1424                 i++;
1425                 for (; buf[i] && isspace(buf[i]); i++)
1426                         ; /* do nothing */
1427                 return i;
1428         }
1429         return 0;
1430 }
1431
1432 /* if new_name == NULL, the section is removed instead */
1433 int git_config_rename_section(const char *old_name, const char *new_name)
1434 {
1435         int ret = 0, remove = 0;
1436         char *config_filename;
1437         struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1438         int out_fd;
1439         char buf[1024];
1440
1441         if (config_exclusive_filename)
1442                 config_filename = xstrdup(config_exclusive_filename);
1443         else
1444                 config_filename = git_pathdup("config");
1445         out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1446         if (out_fd < 0) {
1447                 ret = error("could not lock config file %s", config_filename);
1448                 goto out;
1449         }
1450
1451         if (!(config_file = fopen(config_filename, "rb"))) {
1452                 /* no config file means nothing to rename, no error */
1453                 goto unlock_and_out;
1454         }
1455
1456         while (fgets(buf, sizeof(buf), config_file)) {
1457                 int i;
1458                 int length;
1459                 char *output = buf;
1460                 for (i = 0; buf[i] && isspace(buf[i]); i++)
1461                         ; /* do nothing */
1462                 if (buf[i] == '[') {
1463                         /* it's a section */
1464                         int offset = section_name_match(&buf[i], old_name);
1465                         if (offset > 0) {
1466                                 ret++;
1467                                 if (new_name == NULL) {
1468                                         remove = 1;
1469                                         continue;
1470                                 }
1471                                 store.baselen = strlen(new_name);
1472                                 if (!store_write_section(out_fd, new_name)) {
1473                                         ret = write_error(lock->filename);
1474                                         goto out;
1475                                 }
1476                                 /*
1477                                  * We wrote out the new section, with
1478                                  * a newline, now skip the old
1479                                  * section's length
1480                                  */
1481                                 output += offset + i;
1482                                 if (strlen(output) > 0) {
1483                                         /*
1484                                          * More content means there's
1485                                          * a declaration to put on the
1486                                          * next line; indent with a
1487                                          * tab
1488                                          */
1489                                         output -= 1;
1490                                         output[0] = '\t';
1491                                 }
1492                         }
1493                         remove = 0;
1494                 }
1495                 if (remove)
1496                         continue;
1497                 length = strlen(output);
1498                 if (write_in_full(out_fd, output, length) != length) {
1499                         ret = write_error(lock->filename);
1500                         goto out;
1501                 }
1502         }
1503         fclose(config_file);
1504  unlock_and_out:
1505         if (commit_lock_file(lock) < 0)
1506                 ret = error("could not commit config file %s", config_filename);
1507  out:
1508         free(config_filename);
1509         return ret;
1510 }
1511
1512 /*
1513  * Call this to report error for your variable that should not
1514  * get a boolean value (i.e. "[my] var" means "true").
1515  */
1516 int config_error_nonbool(const char *var)
1517 {
1518         return error("Missing value for '%s'", var);
1519 }