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