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