config.c

   1 /*
   2  * GIT - The information manager from hell
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  * Copyright (C) Johannes Schindelin, 2005
   6  *
   7  */
   8 #include "cache.h"
   9 #include "exec_cmd.h"
  10 #include "strbuf.h"
  11 #include "quote.h"
  12
  13 #define MAXNAME (256)
  14
  15 static FILE *config_file;
  16 static const char *config_file_name;
  17 static int config_linenr;
  18 static int config_file_eof;
  19 static int zlib_compression_seen;
  20
  21 const char *config_exclusive_filename = NULL;
  22
  23 static void lowercase(char *p)
  24 {
  25         for (; *p; p++)
  26                 *p = tolower(*p);
  27 }
  28
  29 void git_config_push_parameter(const char *text)
  30 {
  31         struct strbuf env = STRBUF_INIT;
  32         const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
  33         if (old) {
  34                 strbuf_addstr(&env, old);
  35                 strbuf_addch(&env, ' ');
  36         }
  37         sq_quote_buf(&env, text);
  38         setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
  39         strbuf_release(&env);
  40 }
  41
  42 static int git_config_parse_parameter(const char *text,
  43                                       config_fn_t fn, void *data)
  44 {
  45         struct strbuf tmp = STRBUF_INIT;
  46         struct strbuf **pair;
  47         strbuf_addstr(&tmp, text);
  48         pair = strbuf_split(&tmp, '=');
  49         if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
  50                 strbuf_setlen(pair[0], pair[0]->len - 1);
  51         strbuf_trim(pair[0]);
  52         if (!pair[0]->len) {
  53                 strbuf_list_free(pair);
  54                 return error("bogus config parameter: %s", text);
  55         }
  56         lowercase(pair[0]->buf);
  57         if (fn(pair[0]->buf, pair[1] ? pair[1]->buf : NULL, data) < 0) {
  58                 strbuf_list_free(pair);
  59                 return -1;
  60         }
  61         strbuf_list_free(pair);
  62         return 0;
  63 }
  64
  65 int git_config_from_parameters(config_fn_t fn, void *data)
  66 {
  67         const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
  68         char *envw;
  69         const char **argv = NULL;
  70         int nr = 0, alloc = 0;
  71         int i;
  72
  73         if (!env)
  74                 return 0;
  75         /* sq_dequote will write over it */
  76         envw = xstrdup(env);
  77
  78         if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
  79                 free(envw);
  80                 return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
  81         }
  82
  83         for (i = 0; i < nr; i++) {
  84                 if (git_config_parse_parameter(argv[i], fn, data) < 0) {
  85                         free(argv);
  86                         free(envw);
  87                         return -1;
  88                 }
  89         }
  90
  91         free(argv);
  92         free(envw);
  93         return nr > 0;
  94 }
  95
  96 static int get_next_char(void)
  97 {
  98         int c;
  99         FILE *f;
 100
 101         c = '\n';
 102         if ((f = config_file) != NULL) {
 103                 c = fgetc(f);
 104                 if (c == '\r') {
 105                         /* DOS like systems */
 106                         c = fgetc(f);
 107                         if (c != '\n') {
 108                                 ungetc(c, f);
 109                                 c = '\r';
 110                         }
 111                 }
 112                 if (c == '\n')
 113                         config_linenr++;
 114                 if (c == EOF) {
 115                         config_file_eof = 1;
 116                         c = '\n';
 117                 }
 118         }
 119         return c;
 120 }
 121
 122 static char *parse_value(void)
 123 {
 124         static char value[1024];
 125         int quote = 0, comment = 0, len = 0, space = 0;
 126
 127         for (;;) {
 128                 int c = get_next_char();
 129                 if (len >= sizeof(value) - 1)
 130                         return NULL;
 131                 if (c == '\n') {
 132                         if (quote)
 133                                 return NULL;
 134                         value[len] = 0;
 135                         return value;
 136                 }
 137                 if (comment)
 138                         continue;
 139                 if (isspace(c) && !quote) {
 140                         if (len)
 141                                 space++;
 142                         continue;
 143                 }
 144                 if (!quote) {
 145                         if (c == ';' || c == '#') {
 146                                 comment = 1;
 147                                 continue;
 148                         }
 149                 }
 150                 for (; space; space--)
 151                         value[len++] = ' ';
 152                 if (c == '\\') {
 153                         c = get_next_char();
 154                         switch (c) {
 155                         case '\n':
 156                                 continue;
 157                         case 't':
 158                                 c = '\t';
 159                                 break;
 160                         case 'b':
 161                                 c = '\b';
 162                                 break;
 163                         case 'n':
 164                                 c = '\n';
 165                                 break;
 166                         /* Some characters escape as themselves */
 167                         case '\\': case '"':
 168                                 break;
 169                         /* Reject unknown escape sequences */
 170                         default:
 171                                 return NULL;
 172                         }
 173                         value[len++] = c;
 174                         continue;
 175                 }
 176                 if (c == '"') {
 177                         quote = 1-quote;
 178                         continue;
 179                 }
 180                 value[len++] = c;
 181         }
 182 }
 183
 184 static inline int iskeychar(int c)
 185 {
 186         return isalnum(c) || c == '-';
 187 }
 188
 189 static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
 190 {
 191         int c;
 192         char *value;
 193
 194         /* Get the full name */
 195         for (;;) {
 196                 c = get_next_char();
 197                 if (config_file_eof)
 198                         break;
 199                 if (!iskeychar(c))
 200                         break;
 201                 name[len++] = tolower(c);
 202                 if (len >= MAXNAME)
 203                         return -1;
 204         }
 205         name[len] = 0;
 206         while (c == ' ' || c == '\t')
 207                 c = get_next_char();
 208
 209         value = NULL;
 210         if (c != '\n') {
 211                 if (c != '=')
 212                         return -1;
 213                 value = parse_value();
 214                 if (!value)
 215                         return -1;
 216         }
 217         return fn(name, value, data);
 218 }
 219
 220 static int get_extended_base_var(char *name, int baselen, int c)
 221 {
 222         do {
 223                 if (c == '\n')
 224                         return -1;
 225                 c = get_next_char();
 226         } while (isspace(c));
 227
 228         /* We require the format to be '[base "extension"]' */
 229         if (c != '"')
 230                 return -1;
 231         name[baselen++] = '.';
 232
 233         for (;;) {
 234                 int c = get_next_char();
 235                 if (c == '\n')
 236                         return -1;
 237                 if (c == '"')
 238                         break;
 239                 if (c == '\\') {
 240                         c = get_next_char();
 241                         if (c == '\n')
 242                                 return -1;
 243                 }
 244                 name[baselen++] = c;
 245                 if (baselen > MAXNAME / 2)
 246                         return -1;
 247         }
 248
 249         /* Final ']' */
 250         if (get_next_char() != ']')
 251                 return -1;
 252         return baselen;
 253 }
 254
 255 static int get_base_var(char *name)
 256 {
 257         int baselen = 0;
 258
 259         for (;;) {
 260                 int c = get_next_char();
 261                 if (config_file_eof)
 262                         return -1;
 263                 if (c == ']')
 264                         return baselen;
 265                 if (isspace(c))
 266                         return get_extended_base_var(name, baselen, c);
 267                 if (!iskeychar(c) && c != '.')
 268                         return -1;
 269                 if (baselen > MAXNAME / 2)
 270                         return -1;
 271                 name[baselen++] = tolower(c);
 272         }
 273 }
 274
 275 static int git_parse_file(config_fn_t fn, void *data)
 276 {
 277         int comment = 0;
 278         int baselen = 0;
 279         static char var[MAXNAME];
 280
 281         /* U+FEFF Byte Order Mark in UTF8 */
 282         static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 283         const unsigned char *bomptr = utf8_bom;
 284
 285         for (;;) {
 286                 int c = get_next_char();
 287                 if (bomptr && *bomptr) {
 288                         /* We are at the file beginning; skip UTF8-encoded BOM
 289                          * if present. Sane editors won't put this in on their
 290                          * own, but e.g. Windows Notepad will do it happily. */
 291                         if ((unsigned char) c == *bomptr) {
 292                                 bomptr++;
 293                                 continue;
 294                         } else {
 295                                 /* Do not tolerate partial BOM. */
 296                                 if (bomptr != utf8_bom)
 297                                         break;
 298                                 /* No BOM at file beginning. Cool. */
 299                                 bomptr = NULL;
 300                         }
 301                 }
 302                 if (c == '\n') {
 303                         if (config_file_eof)
 304                                 return 0;
 305                         comment = 0;
 306                         continue;
 307                 }
 308                 if (comment || isspace(c))
 309                         continue;
 310                 if (c == '#' || c == ';') {
 311                         comment = 1;
 312                         continue;
 313                 }
 314                 if (c == '[') {
 315                         baselen = get_base_var(var);
 316                         if (baselen <= 0)
 317                                 break;
 318                         var[baselen++] = '.';
 319                         var[baselen] = 0;
 320                         continue;
 321                 }
 322                 if (!isalpha(c))
 323                         break;
 324                 var[baselen] = tolower(c);
 325                 if (get_value(fn, data, var, baselen+1) < 0)
 326                         break;
 327         }
 328         die("bad config file line %d in %s", config_linenr, config_file_name);
 329 }
 330
 331 static int parse_unit_factor(const char *end, unsigned long *val)
 332 {
 333         if (!*end)
 334                 return 1;
 335         else if (!strcasecmp(end, "k")) {
 336                 *val *= 1024;
 337                 return 1;
 338         }
 339         else if (!strcasecmp(end, "m")) {
 340                 *val *= 1024 * 1024;
 341                 return 1;
 342         }
 343         else if (!strcasecmp(end, "g")) {
 344                 *val *= 1024 * 1024 * 1024;
 345                 return 1;
 346         }
 347         return 0;
 348 }
 349
 350 static int git_parse_long(const char *value, long *ret)
 351 {
 352         if (value && *value) {
 353                 char *end;
 354                 long val = strtol(value, &end, 0);
 355                 unsigned long factor = 1;
 356                 if (!parse_unit_factor(end, &factor))
 357                         return 0;
 358                 *ret = val * factor;
 359                 return 1;
 360         }
 361         return 0;
 362 }
 363
 364 int git_parse_ulong(const char *value, unsigned long *ret)
 365 {
 366         if (value && *value) {
 367                 char *end;
 368                 unsigned long val = strtoul(value, &end, 0);
 369                 if (!parse_unit_factor(end, &val))
 370                         return 0;
 371                 *ret = val;
 372                 return 1;
 373         }
 374         return 0;
 375 }
 376
 377 static void die_bad_config(const char *name)
 378 {
 379         if (config_file_name)
 380                 die("bad config value for '%s' in %s", name, config_file_name);
 381         die("bad config value for '%s'", name);
 382 }
 383
 384 int git_config_int(const char *name, const char *value)
 385 {
 386         long ret = 0;
 387         if (!git_parse_long(value, &ret))
 388                 die_bad_config(name);
 389         return ret;
 390 }
 391
 392 unsigned long git_config_ulong(const char *name, const char *value)
 393 {
 394         unsigned long ret;
 395         if (!git_parse_ulong(value, &ret))
 396                 die_bad_config(name);
 397         return ret;
 398 }
 399
 400 int git_config_maybe_bool(const char *name, const char *value)
 401 {
 402         if (!value)
 403                 return 1;
 404         if (!*value)
 405                 return 0;
 406         if (!strcasecmp(value, "true")
 407             || !strcasecmp(value, "yes")
 408             || !strcasecmp(value, "on"))
 409                 return 1;
 410         if (!strcasecmp(value, "false")
 411             || !strcasecmp(value, "no")
 412             || !strcasecmp(value, "off"))
 413                 return 0;
 414         return -1;
 415 }
 416
 417 int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 418 {
 419         int v = git_config_maybe_bool(name, value);
 420         if (0 <= v) {
 421                 *is_bool = 1;
 422                 return v;
 423         }
 424         *is_bool = 0;
 425         return git_config_int(name, value);
 426 }
 427
 428 int git_config_bool(const char *name, const char *value)
 429 {
 430         int discard;
 431         return !!git_config_bool_or_int(name, value, &discard);
 432 }
 433
 434 int git_config_string(const char **dest, const char *var, const char *value)
 435 {
 436         if (!value)
 437                 return config_error_nonbool(var);
 438         *dest = xstrdup(value);
 439         return 0;
 440 }
 441
 442 int git_config_pathname(const char **dest, const char *var, const char *value)
 443 {
 444         if (!value)
 445                 return config_error_nonbool(var);
 446         *dest = expand_user_path(value);
 447         if (!*dest)
 448                 die("Failed to expand user dir in: '%s'", value);
 449         return 0;
 450 }
 451
 452 static int git_default_core_config(const char *var, const char *value)
 453 {
 454         /* This needs a better name */
 455         if (!strcmp(var, "core.filemode")) {
 456                 trust_executable_bit = git_config_bool(var, value);
 457                 return 0;
 458         }
 459         if (!strcmp(var, "core.trustctime")) {
 460                 trust_ctime = git_config_bool(var, value);
 461                 return 0;
 462         }
 463
 464         if (!strcmp(var, "core.quotepath")) {
 465                 quote_path_fully = git_config_bool(var, value);
 466                 return 0;
 467         }
 468
 469         if (!strcmp(var, "core.symlinks")) {
 470                 has_symlinks = git_config_bool(var, value);
 471                 return 0;
 472         }
 473
 474         if (!strcmp(var, "core.ignorecase")) {
 475                 ignore_case = git_config_bool(var, value);
 476                 return 0;
 477         }
 478
 479         if (!strcmp(var, "core.bare")) {
 480                 is_bare_repository_cfg = git_config_bool(var, value);
 481                 return 0;
 482         }
 483
 484         if (!strcmp(var, "core.ignorestat")) {
 485                 assume_unchanged = git_config_bool(var, value);
 486                 return 0;
 487         }
 488
 489         if (!strcmp(var, "core.prefersymlinkrefs")) {
 490                 prefer_symlink_refs = git_config_bool(var, value);
 491                 return 0;
 492         }
 493
 494         if (!strcmp(var, "core.logallrefupdates")) {
 495                 log_all_ref_updates = git_config_bool(var, value);
 496                 return 0;
 497         }
 498
 499         if (!strcmp(var, "core.warnambiguousrefs")) {
 500                 warn_ambiguous_refs = git_config_bool(var, value);
 501                 return 0;
 502         }
 503
 504         if (!strcmp(var, "core.loosecompression")) {
 505                 int level = git_config_int(var, value);
 506                 if (level == -1)
 507                         level = Z_DEFAULT_COMPRESSION;
 508                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 509                         die("bad zlib compression level %d", level);
 510                 zlib_compression_level = level;
 511                 zlib_compression_seen = 1;
 512                 return 0;
 513         }
 514
 515         if (!strcmp(var, "core.compression")) {
 516                 int level = git_config_int(var, value);
 517                 if (level == -1)
 518                         level = Z_DEFAULT_COMPRESSION;
 519                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 520                         die("bad zlib compression level %d", level);
 521                 core_compression_level = level;
 522                 core_compression_seen = 1;
 523                 if (!zlib_compression_seen)
 524                         zlib_compression_level = level;
 525                 return 0;
 526         }
 527
 528         if (!strcmp(var, "core.packedgitwindowsize")) {
 529                 int pgsz_x2 = getpagesize() * 2;
 530                 packed_git_window_size = git_config_int(var, value);
 531
 532                 /* This value must be multiple of (pagesize * 2) */
 533                 packed_git_window_size /= pgsz_x2;
 534                 if (packed_git_window_size < 1)
 535                         packed_git_window_size = 1;
 536                 packed_git_window_size *= pgsz_x2;
 537                 return 0;
 538         }
 539
 540         if (!strcmp(var, "core.packedgitlimit")) {
 541                 packed_git_limit = git_config_int(var, value);
 542                 return 0;
 543         }
 544
 545         if (!strcmp(var, "core.deltabasecachelimit")) {
 546                 delta_base_cache_limit = git_config_int(var, value);
 547                 return 0;
 548         }
 549
 550         if (!strcmp(var, "core.autocrlf")) {
 551                 if (value && !strcasecmp(value, "input")) {
 552                         if (eol == EOL_CRLF)
 553                                 return error("core.autocrlf=input conflicts with core.eol=crlf");
 554                         auto_crlf = AUTO_CRLF_INPUT;
 555                         return 0;
 556                 }
 557                 auto_crlf = git_config_bool(var, value);
 558                 return 0;
 559         }
 560
 561         if (!strcmp(var, "core.safecrlf")) {
 562                 if (value && !strcasecmp(value, "warn")) {
 563                         safe_crlf = SAFE_CRLF_WARN;
 564                         return 0;
 565                 }
 566                 safe_crlf = git_config_bool(var, value);
 567                 return 0;
 568         }
 569
 570         if (!strcmp(var, "core.eol")) {
 571                 if (value && !strcasecmp(value, "lf"))
 572                         eol = EOL_LF;
 573                 else if (value && !strcasecmp(value, "crlf"))
 574                         eol = EOL_CRLF;
 575                 else if (value && !strcasecmp(value, "native"))
 576                         eol = EOL_NATIVE;
 577                 else
 578                         eol = EOL_UNSET;
 579                 if (eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 580                         return error("core.autocrlf=input conflicts with core.eol=crlf");
 581                 return 0;
 582         }
 583
 584         if (!strcmp(var, "core.notesref")) {
 585                 notes_ref_name = xstrdup(value);
 586                 return 0;
 587         }
 588
 589         if (!strcmp(var, "core.pager"))
 590                 return git_config_string(&pager_program, var, value);
 591
 592         if (!strcmp(var, "core.editor"))
 593                 return git_config_string(&editor_program, var, value);
 594
 595         if (!strcmp(var, "core.askpass"))
 596                 return git_config_string(&askpass_program, var, value);
 597
 598         if (!strcmp(var, "core.excludesfile"))
 599                 return git_config_pathname(&excludes_file, var, value);
 600
 601         if (!strcmp(var, "core.whitespace")) {
 602                 if (!value)
 603                         return config_error_nonbool(var);
 604                 whitespace_rule_cfg = parse_whitespace_rule(value);
 605                 return 0;
 606         }
 607
 608         if (!strcmp(var, "core.fsyncobjectfiles")) {
 609                 fsync_object_files = git_config_bool(var, value);
 610                 return 0;
 611         }
 612
 613         if (!strcmp(var, "core.preloadindex")) {
 614                 core_preload_index = git_config_bool(var, value);
 615                 return 0;
 616         }
 617
 618         if (!strcmp(var, "core.createobject")) {
 619                 if (!strcmp(value, "rename"))
 620                         object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 621                 else if (!strcmp(value, "link"))
 622                         object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 623                 else
 624                         die("Invalid mode for object creation: %s", value);
 625                 return 0;
 626         }
 627
 628         if (!strcmp(var, "core.sparsecheckout")) {
 629                 core_apply_sparse_checkout = git_config_bool(var, value);
 630                 return 0;
 631         }
 632
 633         /* Add other config variables here and to Documentation/config.txt. */
 634         return 0;
 635 }
 636
 637 static int git_default_user_config(const char *var, const char *value)
 638 {
 639         if (!strcmp(var, "user.name")) {
 640                 if (!value)
 641                         return config_error_nonbool(var);
 642                 strlcpy(git_default_name, value, sizeof(git_default_name));
 643                 user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 644                 return 0;
 645         }
 646
 647         if (!strcmp(var, "user.email")) {
 648                 if (!value)
 649                         return config_error_nonbool(var);
 650                 strlcpy(git_default_email, value, sizeof(git_default_email));
 651                 user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 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_i18n_config(const char *var, const char *value)
 660 {
 661         if (!strcmp(var, "i18n.commitencoding"))
 662                 return git_config_string(&git_commit_encoding, var, value);
 663
 664         if (!strcmp(var, "i18n.logoutputencoding"))
 665                 return git_config_string(&git_log_output_encoding, var, value);
 666
 667         /* Add other config variables here and to Documentation/config.txt. */
 668         return 0;
 669 }
 670
 671 static int git_default_branch_config(const char *var, const char *value)
 672 {
 673         if (!strcmp(var, "branch.autosetupmerge")) {
 674                 if (value && !strcasecmp(value, "always")) {
 675                         git_branch_track = BRANCH_TRACK_ALWAYS;
 676                         return 0;
 677                 }
 678                 git_branch_track = git_config_bool(var, value);
 679                 return 0;
 680         }
 681         if (!strcmp(var, "branch.autosetuprebase")) {
 682                 if (!value)
 683                         return config_error_nonbool(var);
 684                 else if (!strcmp(value, "never"))
 685                         autorebase = AUTOREBASE_NEVER;
 686                 else if (!strcmp(value, "local"))
 687                         autorebase = AUTOREBASE_LOCAL;
 688                 else if (!strcmp(value, "remote"))
 689                         autorebase = AUTOREBASE_REMOTE;
 690                 else if (!strcmp(value, "always"))
 691                         autorebase = AUTOREBASE_ALWAYS;
 692                 else
 693                         return error("Malformed value for %s", var);
 694                 return 0;
 695         }
 696
 697         /* Add other config variables here and to Documentation/config.txt. */
 698         return 0;
 699 }
 700
 701 static int git_default_push_config(const char *var, const char *value)
 702 {
 703         if (!strcmp(var, "push.default")) {
 704                 if (!value)
 705                         return config_error_nonbool(var);
 706                 else if (!strcmp(value, "nothing"))
 707                         push_default = PUSH_DEFAULT_NOTHING;
 708                 else if (!strcmp(value, "matching"))
 709                         push_default = PUSH_DEFAULT_MATCHING;
 710                 else if (!strcmp(value, "tracking"))
 711                         push_default = PUSH_DEFAULT_TRACKING;
 712                 else if (!strcmp(value, "current"))
 713                         push_default = PUSH_DEFAULT_CURRENT;
 714                 else {
 715                         error("Malformed value for %s: %s", var, value);
 716                         return error("Must be one of nothing, matching, "
 717                                      "tracking or current.");
 718                 }
 719                 return 0;
 720         }
 721
 722         /* Add other config variables here and to Documentation/config.txt. */
 723         return 0;
 724 }
 725
 726 static int git_default_mailmap_config(const char *var, const char *value)
 727 {
 728         if (!strcmp(var, "mailmap.file"))
 729                 return git_config_string(&git_mailmap_file, var, value);
 730
 731         /* Add other config variables here and to Documentation/config.txt. */
 732         return 0;
 733 }
 734
 735 int git_default_config(const char *var, const char *value, void *dummy)
 736 {
 737         if (!prefixcmp(var, "core."))
 738                 return git_default_core_config(var, value);
 739
 740         if (!prefixcmp(var, "user."))
 741                 return git_default_user_config(var, value);
 742
 743         if (!prefixcmp(var, "i18n."))
 744                 return git_default_i18n_config(var, value);
 745
 746         if (!prefixcmp(var, "branch."))
 747                 return git_default_branch_config(var, value);
 748
 749         if (!prefixcmp(var, "push."))
 750                 return git_default_push_config(var, value);
 751
 752         if (!prefixcmp(var, "mailmap."))
 753                 return git_default_mailmap_config(var, value);
 754
 755         if (!prefixcmp(var, "advice."))
 756                 return git_default_advice_config(var, value);
 757
 758         if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 759                 pager_use_color = git_config_bool(var,value);
 760                 return 0;
 761         }
 762
 763         /* Add other config variables here and to Documentation/config.txt. */
 764         return 0;
 765 }
 766
 767 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 768 {
 769         int ret;
 770         FILE *f = fopen(filename, "r");
 771
 772         ret = -1;
 773         if (f) {
 774                 config_file = f;
 775                 config_file_name = filename;
 776                 config_linenr = 1;
 777                 config_file_eof = 0;
 778                 ret = git_parse_file(fn, data);
 779                 fclose(f);
 780                 config_file_name = NULL;
 781         }
 782         return ret;
 783 }
 784
 785 const char *git_etc_gitconfig(void)
 786 {
 787         static const char *system_wide;
 788         if (!system_wide)
 789                 system_wide = system_path(ETC_GITCONFIG);
 790         return system_wide;
 791 }
 792
 793 int git_env_bool(const char *k, int def)
 794 {
 795         const char *v = getenv(k);
 796         return v ? git_config_bool(k, v) : def;
 797 }
 798
 799 int git_config_system(void)
 800 {
 801         return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 802 }
 803
 804 int git_config_global(void)
 805 {
 806         return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
 807 }
 808
 809 int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 810 {
 811         int ret = 0, found = 0;
 812         const char *home = NULL;
 813
 814         /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
 815         if (config_exclusive_filename)
 816                 return git_config_from_file(fn, config_exclusive_filename, data);
 817         if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 818                 ret += git_config_from_file(fn, git_etc_gitconfig(),
 819                                             data);
 820                 found += 1;
 821         }
 822
 823         home = getenv("HOME");
 824         if (git_config_global() && home) {
 825                 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
 826                 if (!access(user_config, R_OK)) {
 827                         ret += git_config_from_file(fn, user_config, data);
 828                         found += 1;
 829                 }
 830                 free(user_config);
 831         }
 832
 833         if (repo_config && !access(repo_config, R_OK)) {
 834                 ret += git_config_from_file(fn, repo_config, data);
 835                 found += 1;
 836         }
 837
 838         switch (git_config_from_parameters(fn, data)) {
 839         case -1: /* error */
 840                 ret--;
 841                 break;
 842         case 0: /* found nothing */
 843                 break;
 844         default: /* found at least one item */
 845                 found++;
 846                 break;
 847         }
 848
 849         if (found == 0)
 850                 return -1;
 851         return ret;
 852 }
 853
 854 int git_config(config_fn_t fn, void *data)
 855 {
 856         char *repo_config = NULL;
 857         int ret;
 858
 859         repo_config = git_pathdup("config");
 860         ret = git_config_early(fn, data, repo_config);
 861         if (repo_config)
 862                 free(repo_config);
 863         return ret;
 864 }
 865
 866 /*
 867  * Find all the stuff for git_config_set() below.
 868  */
 869
 870 #define MAX_MATCHES 512
 871
 872 static struct {
 873         int baselen;
 874         char *key;
 875         int do_not_match;
 876         regex_t *value_regex;
 877         int multi_replace;
 878         size_t offset[MAX_MATCHES];
 879         enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 880         int seen;
 881 } store;
 882
 883 static int matches(const char *key, const char *value)
 884 {
 885         return !strcmp(key, store.key) &&
 886                 (store.value_regex == NULL ||
 887                  (store.do_not_match ^
 888                   !regexec(store.value_regex, value, 0, NULL, 0)));
 889 }
 890
 891 static int store_aux(const char *key, const char *value, void *cb)
 892 {
 893         const char *ep;
 894         size_t section_len;
 895
 896         switch (store.state) {
 897         case KEY_SEEN:
 898                 if (matches(key, value)) {
 899                         if (store.seen == 1 && store.multi_replace == 0) {
 900                                 warning("%s has multiple values", key);
 901                         } else if (store.seen >= MAX_MATCHES) {
 902                                 error("too many matches for %s", key);
 903                                 return 1;
 904                         }
 905
 906                         store.offset[store.seen] = ftell(config_file);
 907                         store.seen++;
 908                 }
 909                 break;
 910         case SECTION_SEEN:
 911                 /*
 912                  * What we are looking for is in store.key (both
 913                  * section and var), and its section part is baselen
 914                  * long.  We found key (again, both section and var).
 915                  * We would want to know if this key is in the same
 916                  * section as what we are looking for.  We already
 917                  * know we are in the same section as what should
 918                  * hold store.key.
 919                  */
 920                 ep = strrchr(key, '.');
 921                 section_len = ep - key;
 922
 923                 if ((section_len != store.baselen) ||
 924                     memcmp(key, store.key, section_len+1)) {
 925                         store.state = SECTION_END_SEEN;
 926                         break;
 927                 }
 928
 929                 /*
 930                  * Do not increment matches: this is no match, but we
 931                  * just made sure we are in the desired section.
 932                  */
 933                 store.offset[store.seen] = ftell(config_file);
 934                 /* fallthru */
 935         case SECTION_END_SEEN:
 936         case START:
 937                 if (matches(key, value)) {
 938                         store.offset[store.seen] = ftell(config_file);
 939                         store.state = KEY_SEEN;
 940                         store.seen++;
 941                 } else {
 942                         if (strrchr(key, '.') - key == store.baselen &&
 943                               !strncmp(key, store.key, store.baselen)) {
 944                                         store.state = SECTION_SEEN;
 945                                         store.offset[store.seen] = ftell(config_file);
 946                         }
 947                 }
 948         }
 949         return 0;
 950 }
 951
 952 static int write_error(const char *filename)
 953 {
 954         error("failed to write new configuration file %s", filename);
 955
 956         /* Same error code as "failed to rename". */
 957         return 4;
 958 }
 959
 960 static int store_write_section(int fd, const char *key)
 961 {
 962         const char *dot;
 963         int i, success;
 964         struct strbuf sb = STRBUF_INIT;
 965
 966         dot = memchr(key, '.', store.baselen);
 967         if (dot) {
 968                 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
 969                 for (i = dot - key + 1; i < store.baselen; i++) {
 970                         if (key[i] == '"' || key[i] == '\\')
 971                                 strbuf_addch(&sb, '\\');
 972                         strbuf_addch(&sb, key[i]);
 973                 }
 974                 strbuf_addstr(&sb, "\"]\n");
 975         } else {
 976                 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
 977         }
 978
 979         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
 980         strbuf_release(&sb);
 981
 982         return success;
 983 }
 984
 985 static int store_write_pair(int fd, const char *key, const char *value)
 986 {
 987         int i, success;
 988         int length = strlen(key + store.baselen + 1);
 989         const char *quote = "";
 990         struct strbuf sb = STRBUF_INIT;
 991
 992         /*
 993          * Check to see if the value needs to be surrounded with a dq pair.
 994          * Note that problematic characters are always backslash-quoted; this
 995          * check is about not losing leading or trailing SP and strings that
 996          * follow beginning-of-comment characters (i.e. ';' and '#') by the
 997          * configuration parser.
 998          */
 999         if (value[0] == ' ')
1000                 quote = "\"";
1001         for (i = 0; value[i]; i++)
1002                 if (value[i] == ';' || value[i] == '#')
1003                         quote = "\"";
1004         if (i && value[i - 1] == ' ')
1005                 quote = "\"";
1006
1007         strbuf_addf(&sb, "\t%.*s = %s",
1008                     length, key + store.baselen + 1, quote);
1009
1010         for (i = 0; value[i]; i++)
1011                 switch (value[i]) {
1012                 case '\n':
1013                         strbuf_addstr(&sb, "\\n");
1014                         break;
1015                 case '\t':
1016                         strbuf_addstr(&sb, "\\t");
1017                         break;
1018                 case '"':
1019                 case '\\':
1020                         strbuf_addch(&sb, '\\');
1021                 default:
1022                         strbuf_addch(&sb, value[i]);
1023                         break;
1024                 }
1025         strbuf_addf(&sb, "%s\n", quote);
1026
1027         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1028         strbuf_release(&sb);
1029
1030         return success;
1031 }
1032
1033 static ssize_t find_beginning_of_line(const char *contents, size_t size,
1034         size_t offset_, int *found_bracket)
1035 {
1036         size_t equal_offset = size, bracket_offset = size;
1037         ssize_t offset;
1038
1039 contline:
1040         for (offset = offset_-2; offset > 0
1041                         && contents[offset] != '\n'; offset--)
1042                 switch (contents[offset]) {
1043                         case '=': equal_offset = offset; break;
1044                         case ']': bracket_offset = offset; break;
1045                 }
1046         if (offset > 0 && contents[offset-1] == '\\') {
1047                 offset_ = offset;
1048                 goto contline;
1049         }
1050         if (bracket_offset < equal_offset) {
1051                 *found_bracket = 1;
1052                 offset = bracket_offset+1;
1053         } else
1054                 offset++;
1055
1056         return offset;
1057 }
1058
1059 int git_config_set(const char *key, const char *value)
1060 {
1061         return git_config_set_multivar(key, value, NULL, 0);
1062 }
1063
1064 /*
1065  * If value==NULL, unset in (remove from) config,
1066  * if value_regex!=NULL, disregard key/value pairs where value does not match.
1067  * if multi_replace==0, nothing, or only one matching key/value is replaced,
1068  *     else all matching key/values (regardless how many) are removed,
1069  *     before the new pair is written.
1070  *
1071  * Returns 0 on success.
1072  *
1073  * This function does this:
1074  *
1075  * - it locks the config file by creating ".git/config.lock"
1076  *
1077  * - it then parses the config using store_aux() as validator to find
1078  *   the position on the key/value pair to replace. If it is to be unset,
1079  *   it must be found exactly once.
1080  *
1081  * - the config file is mmap()ed and the part before the match (if any) is
1082  *   written to the lock file, then the changed part and the rest.
1083  *
1084  * - the config file is removed and the lock file rename()d to it.
1085  *
1086  */
1087 int git_config_set_multivar(const char *key, const char *value,
1088         const char *value_regex, int multi_replace)
1089 {
1090         int i, dot;
1091         int fd = -1, in_fd;
1092         int ret;
1093         char *config_filename;
1094         struct lock_file *lock = NULL;
1095         const char *last_dot = strrchr(key, '.');
1096
1097         if (config_exclusive_filename)
1098                 config_filename = xstrdup(config_exclusive_filename);
1099         else
1100                 config_filename = git_pathdup("config");
1101
1102         /*
1103          * Since "key" actually contains the section name and the real
1104          * key name separated by a dot, we have to know where the dot is.
1105          */
1106
1107         if (last_dot == NULL) {
1108                 error("key does not contain a section: %s", key);
1109                 ret = 2;
1110                 goto out_free;
1111         }
1112         store.baselen = last_dot - key;
1113
1114         store.multi_replace = multi_replace;
1115
1116         /*
1117          * Validate the key and while at it, lower case it for matching.
1118          */
1119         store.key = xmalloc(strlen(key) + 1);
1120         dot = 0;
1121         for (i = 0; key[i]; i++) {
1122                 unsigned char c = key[i];
1123                 if (c == '.')
1124                         dot = 1;
1125                 /* Leave the extended basename untouched.. */
1126                 if (!dot || i > store.baselen) {
1127                         if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
1128                                 error("invalid key: %s", key);
1129                                 free(store.key);
1130                                 ret = 1;
1131                                 goto out_free;
1132                         }
1133                         c = tolower(c);
1134                 } else if (c == '\n') {
1135                         error("invalid key (newline): %s", key);
1136                         free(store.key);
1137                         ret = 1;
1138                         goto out_free;
1139                 }
1140                 store.key[i] = c;
1141         }
1142         store.key[i] = 0;
1143
1144         /*
1145          * The lock serves a purpose in addition to locking: the new
1146          * contents of .git/config will be written into it.
1147          */
1148         lock = xcalloc(sizeof(struct lock_file), 1);
1149         fd = hold_lock_file_for_update(lock, config_filename, 0);
1150         if (fd < 0) {
1151                 error("could not lock config file %s: %s", config_filename, strerror(errno));
1152                 free(store.key);
1153                 ret = -1;
1154                 goto out_free;
1155         }
1156
1157         /*
1158          * If .git/config does not exist yet, write a minimal version.
1159          */
1160         in_fd = open(config_filename, O_RDONLY);
1161         if ( in_fd < 0 ) {
1162                 free(store.key);
1163
1164                 if ( ENOENT != errno ) {
1165                         error("opening %s: %s", config_filename,
1166                               strerror(errno));
1167                         ret = 3; /* same as "invalid config file" */
1168                         goto out_free;
1169                 }
1170                 /* if nothing to unset, error out */
1171                 if (value == NULL) {
1172                         ret = 5;
1173                         goto out_free;
1174                 }
1175
1176                 store.key = (char *)key;
1177                 if (!store_write_section(fd, key) ||
1178                     !store_write_pair(fd, key, value))
1179                         goto write_err_out;
1180         } else {
1181                 struct stat st;
1182                 char *contents;
1183                 size_t contents_sz, copy_begin, copy_end;
1184                 int i, new_line = 0;
1185
1186                 if (value_regex == NULL)
1187                         store.value_regex = NULL;
1188                 else {
1189                         if (value_regex[0] == '!') {
1190                                 store.do_not_match = 1;
1191                                 value_regex++;
1192                         } else
1193                                 store.do_not_match = 0;
1194
1195                         store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1196                         if (regcomp(store.value_regex, value_regex,
1197                                         REG_EXTENDED)) {
1198                                 error("invalid pattern: %s", value_regex);
1199                                 free(store.value_regex);
1200                                 ret = 6;
1201                                 goto out_free;
1202                         }
1203                 }
1204
1205                 store.offset[0] = 0;
1206                 store.state = START;
1207                 store.seen = 0;
1208
1209                 /*
1210                  * After this, store.offset will contain the *end* offset
1211                  * of the last match, or remain at 0 if no match was found.
1212                  * As a side effect, we make sure to transform only a valid
1213                  * existing config file.
1214                  */
1215                 if (git_config_from_file(store_aux, config_filename, NULL)) {
1216                         error("invalid config file %s", config_filename);
1217                         free(store.key);
1218                         if (store.value_regex != NULL) {
1219                                 regfree(store.value_regex);
1220                                 free(store.value_regex);
1221                         }
1222                         ret = 3;
1223                         goto out_free;
1224                 }
1225
1226                 free(store.key);
1227                 if (store.value_regex != NULL) {
1228                         regfree(store.value_regex);
1229                         free(store.value_regex);
1230                 }
1231
1232                 /* if nothing to unset, or too many matches, error out */
1233                 if ((store.seen == 0 && value == NULL) ||
1234                                 (store.seen > 1 && multi_replace == 0)) {
1235                         ret = 5;
1236                         goto out_free;
1237                 }
1238
1239                 fstat(in_fd, &st);
1240                 contents_sz = xsize_t(st.st_size);
1241                 contents = xmmap(NULL, contents_sz, PROT_READ,
1242                         MAP_PRIVATE, in_fd, 0);
1243                 close(in_fd);
1244
1245                 if (store.seen == 0)
1246                         store.seen = 1;
1247
1248                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1249                         if (store.offset[i] == 0) {
1250                                 store.offset[i] = copy_end = contents_sz;
1251                         } else if (store.state != KEY_SEEN) {
1252                                 copy_end = store.offset[i];
1253                         } else
1254                                 copy_end = find_beginning_of_line(
1255                                         contents, contents_sz,
1256                                         store.offset[i]-2, &new_line);
1257
1258                         if (copy_end > 0 && contents[copy_end-1] != '\n')
1259                                 new_line = 1;
1260
1261                         /* write the first part of the config */
1262                         if (copy_end > copy_begin) {
1263                                 if (write_in_full(fd, contents + copy_begin,
1264                                                   copy_end - copy_begin) <
1265                                     copy_end - copy_begin)
1266                                         goto write_err_out;
1267                                 if (new_line &&
1268                                     write_str_in_full(fd, "\n") != 1)
1269                                         goto write_err_out;
1270                         }
1271                         copy_begin = store.offset[i];
1272                 }
1273
1274                 /* write the pair (value == NULL means unset) */
1275                 if (value != NULL) {
1276                         if (store.state == START) {
1277                                 if (!store_write_section(fd, key))
1278                                         goto write_err_out;
1279                         }
1280                         if (!store_write_pair(fd, key, value))
1281                                 goto write_err_out;
1282                 }
1283
1284                 /* write the rest of the config */
1285                 if (copy_begin < contents_sz)
1286                         if (write_in_full(fd, contents + copy_begin,
1287                                           contents_sz - copy_begin) <
1288                             contents_sz - copy_begin)
1289                                 goto write_err_out;
1290
1291                 munmap(contents, contents_sz);
1292         }
1293
1294         if (commit_lock_file(lock) < 0) {
1295                 error("could not commit config file %s", config_filename);
1296                 ret = 4;
1297                 goto out_free;
1298         }
1299
1300         /*
1301          * lock is committed, so don't try to roll it back below.
1302          * NOTE: Since lockfile.c keeps a linked list of all created
1303          * lock_file structures, it isn't safe to free(lock).  It's
1304          * better to just leave it hanging around.
1305          */
1306         lock = NULL;
1307         ret = 0;
1308
1309 out_free:
1310         if (lock)
1311                 rollback_lock_file(lock);
1312         free(config_filename);
1313         return ret;
1314
1315 write_err_out:
1316         ret = write_error(lock->filename);
1317         goto out_free;
1318
1319 }
1320
1321 static int section_name_match (const char *buf, const char *name)
1322 {
1323         int i = 0, j = 0, dot = 0;
1324         if (buf[i] != '[')
1325                 return 0;
1326         for (i = 1; buf[i] && buf[i] != ']'; i++) {
1327                 if (!dot && isspace(buf[i])) {
1328                         dot = 1;
1329                         if (name[j++] != '.')
1330                                 break;
1331                         for (i++; isspace(buf[i]); i++)
1332                                 ; /* do nothing */
1333                         if (buf[i] != '"')
1334                                 break;
1335                         continue;
1336                 }
1337                 if (buf[i] == '\\' && dot)
1338                         i++;
1339                 else if (buf[i] == '"' && dot) {
1340                         for (i++; isspace(buf[i]); i++)
1341                                 ; /* do_nothing */
1342                         break;
1343                 }
1344                 if (buf[i] != name[j++])
1345                         break;
1346         }
1347         if (buf[i] == ']' && name[j] == 0) {
1348                 /*
1349                  * We match, now just find the right length offset by
1350                  * gobbling up any whitespace after it, as well
1351                  */
1352                 i++;
1353                 for (; buf[i] && isspace(buf[i]); i++)
1354                         ; /* do nothing */
1355                 return i;
1356         }
1357         return 0;
1358 }
1359
1360 /* if new_name == NULL, the section is removed instead */
1361 int git_config_rename_section(const char *old_name, const char *new_name)
1362 {
1363         int ret = 0, remove = 0;
1364         char *config_filename;
1365         struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1366         int out_fd;
1367         char buf[1024];
1368
1369         if (config_exclusive_filename)
1370                 config_filename = xstrdup(config_exclusive_filename);
1371         else
1372                 config_filename = git_pathdup("config");
1373         out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1374         if (out_fd < 0) {
1375                 ret = error("could not lock config file %s", config_filename);
1376                 goto out;
1377         }
1378
1379         if (!(config_file = fopen(config_filename, "rb"))) {
1380                 /* no config file means nothing to rename, no error */
1381                 goto unlock_and_out;
1382         }
1383
1384         while (fgets(buf, sizeof(buf), config_file)) {
1385                 int i;
1386                 int length;
1387                 char *output = buf;
1388                 for (i = 0; buf[i] && isspace(buf[i]); i++)
1389                         ; /* do nothing */
1390                 if (buf[i] == '[') {
1391                         /* it's a section */
1392                         int offset = section_name_match(&buf[i], old_name);
1393                         if (offset > 0) {
1394                                 ret++;
1395                                 if (new_name == NULL) {
1396                                         remove = 1;
1397                                         continue;
1398                                 }
1399                                 store.baselen = strlen(new_name);
1400                                 if (!store_write_section(out_fd, new_name)) {
1401                                         ret = write_error(lock->filename);
1402                                         goto out;
1403                                 }
1404                                 /*
1405                                  * We wrote out the new section, with
1406                                  * a newline, now skip the old
1407                                  * section's length
1408                                  */
1409                                 output += offset + i;
1410                                 if (strlen(output) > 0) {
1411                                         /*
1412                                          * More content means there's
1413                                          * a declaration to put on the
1414                                          * next line; indent with a
1415                                          * tab
1416                                          */
1417                                         output -= 1;
1418                                         output[0] = '\t';
1419                                 }
1420                         }
1421                         remove = 0;
1422                 }
1423                 if (remove)
1424                         continue;
1425                 length = strlen(output);
1426                 if (write_in_full(out_fd, output, length) != length) {
1427                         ret = write_error(lock->filename);
1428                         goto out;
1429                 }
1430         }
1431         fclose(config_file);
1432  unlock_and_out:
1433         if (commit_lock_file(lock) < 0)
1434                 ret = error("could not commit config file %s", config_filename);
1435  out:
1436         free(config_filename);
1437         return ret;
1438 }
1439
1440 /*
1441  * Call this to report error for your variable that should not
1442  * get a boolean value (i.e. "[my] var" means "true").
1443  */
1444 int config_error_nonbool(const char *var)
1445 {
1446         return error("Missing value for '%s'", var);
1447 }