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