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         /* Add other config variables here and to Documentation/config.txt. */
 540         return 0;
 541 }
 542
 543 static int git_default_user_config(const char *var, const char *value)
 544 {
 545         if (!strcmp(var, "user.name")) {
 546                 if (!value)
 547                         return config_error_nonbool(var);
 548                 strlcpy(git_default_name, value, sizeof(git_default_name));
 549                 user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 550                 return 0;
 551         }
 552
 553         if (!strcmp(var, "user.email")) {
 554                 if (!value)
 555                         return config_error_nonbool(var);
 556                 strlcpy(git_default_email, value, sizeof(git_default_email));
 557                 user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 558                 return 0;
 559         }
 560
 561         /* Add other config variables here and to Documentation/config.txt. */
 562         return 0;
 563 }
 564
 565 static int git_default_i18n_config(const char *var, const char *value)
 566 {
 567         if (!strcmp(var, "i18n.commitencoding"))
 568                 return git_config_string(&git_commit_encoding, var, value);
 569
 570         if (!strcmp(var, "i18n.logoutputencoding"))
 571                 return git_config_string(&git_log_output_encoding, var, value);
 572
 573         /* Add other config variables here and to Documentation/config.txt. */
 574         return 0;
 575 }
 576
 577 static int git_default_branch_config(const char *var, const char *value)
 578 {
 579         if (!strcmp(var, "branch.autosetupmerge")) {
 580                 if (value && !strcasecmp(value, "always")) {
 581                         git_branch_track = BRANCH_TRACK_ALWAYS;
 582                         return 0;
 583                 }
 584                 git_branch_track = git_config_bool(var, value);
 585                 return 0;
 586         }
 587         if (!strcmp(var, "branch.autosetuprebase")) {
 588                 if (!value)
 589                         return config_error_nonbool(var);
 590                 else if (!strcmp(value, "never"))
 591                         autorebase = AUTOREBASE_NEVER;
 592                 else if (!strcmp(value, "local"))
 593                         autorebase = AUTOREBASE_LOCAL;
 594                 else if (!strcmp(value, "remote"))
 595                         autorebase = AUTOREBASE_REMOTE;
 596                 else if (!strcmp(value, "always"))
 597                         autorebase = AUTOREBASE_ALWAYS;
 598                 else
 599                         return error("Malformed value for %s", var);
 600                 return 0;
 601         }
 602
 603         /* Add other config variables here and to Documentation/config.txt. */
 604         return 0;
 605 }
 606
 607 static int git_default_push_config(const char *var, const char *value)
 608 {
 609         if (!strcmp(var, "push.default")) {
 610                 if (!value)
 611                         return config_error_nonbool(var);
 612                 else if (!strcmp(value, "nothing"))
 613                         push_default = PUSH_DEFAULT_NOTHING;
 614                 else if (!strcmp(value, "matching"))
 615                         push_default = PUSH_DEFAULT_MATCHING;
 616                 else if (!strcmp(value, "tracking"))
 617                         push_default = PUSH_DEFAULT_TRACKING;
 618                 else if (!strcmp(value, "current"))
 619                         push_default = PUSH_DEFAULT_CURRENT;
 620                 else {
 621                         error("Malformed value for %s: %s", var, value);
 622                         return error("Must be one of nothing, matching, "
 623                                      "tracking or current.");
 624                 }
 625                 return 0;
 626         }
 627
 628         /* Add other config variables here and to Documentation/config.txt. */
 629         return 0;
 630 }
 631
 632 static int git_default_mailmap_config(const char *var, const char *value)
 633 {
 634         if (!strcmp(var, "mailmap.file"))
 635                 return git_config_string(&git_mailmap_file, var, value);
 636
 637         /* Add other config variables here and to Documentation/config.txt. */
 638         return 0;
 639 }
 640
 641 int git_default_config(const char *var, const char *value, void *dummy)
 642 {
 643         if (!prefixcmp(var, "core."))
 644                 return git_default_core_config(var, value);
 645
 646         if (!prefixcmp(var, "user."))
 647                 return git_default_user_config(var, value);
 648
 649         if (!prefixcmp(var, "i18n."))
 650                 return git_default_i18n_config(var, value);
 651
 652         if (!prefixcmp(var, "branch."))
 653                 return git_default_branch_config(var, value);
 654
 655         if (!prefixcmp(var, "push."))
 656                 return git_default_push_config(var, value);
 657
 658         if (!prefixcmp(var, "mailmap."))
 659                 return git_default_mailmap_config(var, value);
 660
 661         if (!prefixcmp(var, "advice."))
 662                 return git_default_advice_config(var, value);
 663
 664         if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 665                 pager_use_color = git_config_bool(var,value);
 666                 return 0;
 667         }
 668
 669         /* Add other config variables here and to Documentation/config.txt. */
 670         return 0;
 671 }
 672
 673 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 674 {
 675         int ret;
 676         FILE *f = fopen(filename, "r");
 677
 678         ret = -1;
 679         if (f) {
 680                 config_file = f;
 681                 config_file_name = filename;
 682                 config_linenr = 1;
 683                 config_file_eof = 0;
 684                 ret = git_parse_file(fn, data);
 685                 fclose(f);
 686                 config_file_name = NULL;
 687         }
 688         return ret;
 689 }
 690
 691 const char *git_etc_gitconfig(void)
 692 {
 693         static const char *system_wide;
 694         if (!system_wide)
 695                 system_wide = system_path(ETC_GITCONFIG);
 696         return system_wide;
 697 }
 698
 699 static int git_env_bool(const char *k, int def)
 700 {
 701         const char *v = getenv(k);
 702         return v ? git_config_bool(k, v) : def;
 703 }
 704
 705 int git_config_system(void)
 706 {
 707         return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 708 }
 709
 710 int git_config_global(void)
 711 {
 712         return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
 713 }
 714
 715 int git_config(config_fn_t fn, void *data)
 716 {
 717         int ret = 0, found = 0;
 718         char *repo_config = NULL;
 719         const char *home = NULL;
 720
 721         /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
 722         if (config_exclusive_filename)
 723                 return git_config_from_file(fn, config_exclusive_filename, data);
 724         if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 725                 ret += git_config_from_file(fn, git_etc_gitconfig(),
 726                                             data);
 727                 found += 1;
 728         }
 729
 730         home = getenv("HOME");
 731         if (git_config_global() && home) {
 732                 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
 733                 if (!access(user_config, R_OK)) {
 734                         ret += git_config_from_file(fn, user_config, data);
 735                         found += 1;
 736                 }
 737                 free(user_config);
 738         }
 739
 740         repo_config = git_pathdup("config");
 741         if (!access(repo_config, R_OK)) {
 742                 ret += git_config_from_file(fn, repo_config, data);
 743                 found += 1;
 744         }
 745         free(repo_config);
 746         if (found == 0)
 747                 return -1;
 748         return ret;
 749 }
 750
 751 /*
 752  * Find all the stuff for git_config_set() below.
 753  */
 754
 755 #define MAX_MATCHES 512
 756
 757 static struct {
 758         int baselen;
 759         char *key;
 760         int do_not_match;
 761         regex_t *value_regex;
 762         int multi_replace;
 763         size_t offset[MAX_MATCHES];
 764         enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 765         int seen;
 766 } store;
 767
 768 static int matches(const char *key, const char *value)
 769 {
 770         return !strcmp(key, store.key) &&
 771                 (store.value_regex == NULL ||
 772                  (store.do_not_match ^
 773                   !regexec(store.value_regex, value, 0, NULL, 0)));
 774 }
 775
 776 static int store_aux(const char *key, const char *value, void *cb)
 777 {
 778         const char *ep;
 779         size_t section_len;
 780
 781         switch (store.state) {
 782         case KEY_SEEN:
 783                 if (matches(key, value)) {
 784                         if (store.seen == 1 && store.multi_replace == 0) {
 785                                 warning("%s has multiple values", key);
 786                         } else if (store.seen >= MAX_MATCHES) {
 787                                 error("too many matches for %s", key);
 788                                 return 1;
 789                         }
 790
 791                         store.offset[store.seen] = ftell(config_file);
 792                         store.seen++;
 793                 }
 794                 break;
 795         case SECTION_SEEN:
 796                 /*
 797                  * What we are looking for is in store.key (both
 798                  * section and var), and its section part is baselen
 799                  * long.  We found key (again, both section and var).
 800                  * We would want to know if this key is in the same
 801                  * section as what we are looking for.  We already
 802                  * know we are in the same section as what should
 803                  * hold store.key.
 804                  */
 805                 ep = strrchr(key, '.');
 806                 section_len = ep - key;
 807
 808                 if ((section_len != store.baselen) ||
 809                     memcmp(key, store.key, section_len+1)) {
 810                         store.state = SECTION_END_SEEN;
 811                         break;
 812                 }
 813
 814                 /*
 815                  * Do not increment matches: this is no match, but we
 816                  * just made sure we are in the desired section.
 817                  */
 818                 store.offset[store.seen] = ftell(config_file);
 819                 /* fallthru */
 820         case SECTION_END_SEEN:
 821         case START:
 822                 if (matches(key, value)) {
 823                         store.offset[store.seen] = ftell(config_file);
 824                         store.state = KEY_SEEN;
 825                         store.seen++;
 826                 } else {
 827                         if (strrchr(key, '.') - key == store.baselen &&
 828                               !strncmp(key, store.key, store.baselen)) {
 829                                         store.state = SECTION_SEEN;
 830                                         store.offset[store.seen] = ftell(config_file);
 831                         }
 832                 }
 833         }
 834         return 0;
 835 }
 836
 837 static int write_error(const char *filename)
 838 {
 839         error("failed to write new configuration file %s", filename);
 840
 841         /* Same error code as "failed to rename". */
 842         return 4;
 843 }
 844
 845 static int store_write_section(int fd, const char *key)
 846 {
 847         const char *dot;
 848         int i, success;
 849         struct strbuf sb = STRBUF_INIT;
 850
 851         dot = memchr(key, '.', store.baselen);
 852         if (dot) {
 853                 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
 854                 for (i = dot - key + 1; i < store.baselen; i++) {
 855                         if (key[i] == '"' || key[i] == '\\')
 856                                 strbuf_addch(&sb, '\\');
 857                         strbuf_addch(&sb, key[i]);
 858                 }
 859                 strbuf_addstr(&sb, "\"]\n");
 860         } else {
 861                 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
 862         }
 863
 864         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
 865         strbuf_release(&sb);
 866
 867         return success;
 868 }
 869
 870 static int store_write_pair(int fd, const char *key, const char *value)
 871 {
 872         int i, success;
 873         int length = strlen(key + store.baselen + 1);
 874         const char *quote = "";
 875         struct strbuf sb = STRBUF_INIT;
 876
 877         /*
 878          * Check to see if the value needs to be surrounded with a dq pair.
 879          * Note that problematic characters are always backslash-quoted; this
 880          * check is about not losing leading or trailing SP and strings that
 881          * follow beginning-of-comment characters (i.e. ';' and '#') by the
 882          * configuration parser.
 883          */
 884         if (value[0] == ' ')
 885                 quote = "\"";
 886         for (i = 0; value[i]; i++)
 887                 if (value[i] == ';' || value[i] == '#')
 888                         quote = "\"";
 889         if (i && value[i - 1] == ' ')
 890                 quote = "\"";
 891
 892         strbuf_addf(&sb, "\t%.*s = %s",
 893                     length, key + store.baselen + 1, quote);
 894
 895         for (i = 0; value[i]; i++)
 896                 switch (value[i]) {
 897                 case '\n':
 898                         strbuf_addstr(&sb, "\\n");
 899                         break;
 900                 case '\t':
 901                         strbuf_addstr(&sb, "\\t");
 902                         break;
 903                 case '"':
 904                 case '\\':
 905                         strbuf_addch(&sb, '\\');
 906                 default:
 907                         strbuf_addch(&sb, value[i]);
 908                         break;
 909                 }
 910         strbuf_addf(&sb, "%s\n", quote);
 911
 912         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
 913         strbuf_release(&sb);
 914
 915         return success;
 916 }
 917
 918 static ssize_t find_beginning_of_line(const char *contents, size_t size,
 919         size_t offset_, int *found_bracket)
 920 {
 921         size_t equal_offset = size, bracket_offset = size;
 922         ssize_t offset;
 923
 924 contline:
 925         for (offset = offset_-2; offset > 0
 926                         && contents[offset] != '\n'; offset--)
 927                 switch (contents[offset]) {
 928                         case '=': equal_offset = offset; break;
 929                         case ']': bracket_offset = offset; break;
 930                 }
 931         if (offset > 0 && contents[offset-1] == '\\') {
 932                 offset_ = offset;
 933                 goto contline;
 934         }
 935         if (bracket_offset < equal_offset) {
 936                 *found_bracket = 1;
 937                 offset = bracket_offset+1;
 938         } else
 939                 offset++;
 940
 941         return offset;
 942 }
 943
 944 int git_config_set(const char *key, const char *value)
 945 {
 946         return git_config_set_multivar(key, value, NULL, 0);
 947 }
 948
 949 /*
 950  * If value==NULL, unset in (remove from) config,
 951  * if value_regex!=NULL, disregard key/value pairs where value does not match.
 952  * if multi_replace==0, nothing, or only one matching key/value is replaced,
 953  *     else all matching key/values (regardless how many) are removed,
 954  *     before the new pair is written.
 955  *
 956  * Returns 0 on success.
 957  *
 958  * This function does this:
 959  *
 960  * - it locks the config file by creating ".git/config.lock"
 961  *
 962  * - it then parses the config using store_aux() as validator to find
 963  *   the position on the key/value pair to replace. If it is to be unset,
 964  *   it must be found exactly once.
 965  *
 966  * - the config file is mmap()ed and the part before the match (if any) is
 967  *   written to the lock file, then the changed part and the rest.
 968  *
 969  * - the config file is removed and the lock file rename()d to it.
 970  *
 971  */
 972 int git_config_set_multivar(const char *key, const char *value,
 973         const char *value_regex, int multi_replace)
 974 {
 975         int i, dot;
 976         int fd = -1, in_fd;
 977         int ret;
 978         char *config_filename;
 979         struct lock_file *lock = NULL;
 980         const char *last_dot = strrchr(key, '.');
 981
 982         if (config_exclusive_filename)
 983                 config_filename = xstrdup(config_exclusive_filename);
 984         else
 985                 config_filename = git_pathdup("config");
 986
 987         /*
 988          * Since "key" actually contains the section name and the real
 989          * key name separated by a dot, we have to know where the dot is.
 990          */
 991
 992         if (last_dot == NULL) {
 993                 error("key does not contain a section: %s", key);
 994                 ret = 2;
 995                 goto out_free;
 996         }
 997         store.baselen = last_dot - key;
 998
 999         store.multi_replace = multi_replace;
1000
1001         /*
1002          * Validate the key and while at it, lower case it for matching.
1003          */
1004         store.key = xmalloc(strlen(key) + 1);
1005         dot = 0;
1006         for (i = 0; key[i]; i++) {
1007                 unsigned char c = key[i];
1008                 if (c == '.')
1009                         dot = 1;
1010                 /* Leave the extended basename untouched.. */
1011                 if (!dot || i > store.baselen) {
1012                         if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
1013                                 error("invalid key: %s", key);
1014                                 free(store.key);
1015                                 ret = 1;
1016                                 goto out_free;
1017                         }
1018                         c = tolower(c);
1019                 } else if (c == '\n') {
1020                         error("invalid key (newline): %s", key);
1021                         free(store.key);
1022                         ret = 1;
1023                         goto out_free;
1024                 }
1025                 store.key[i] = c;
1026         }
1027         store.key[i] = 0;
1028
1029         /*
1030          * The lock serves a purpose in addition to locking: the new
1031          * contents of .git/config will be written into it.
1032          */
1033         lock = xcalloc(sizeof(struct lock_file), 1);
1034         fd = hold_lock_file_for_update(lock, config_filename, 0);
1035         if (fd < 0) {
1036                 error("could not lock config file %s: %s", config_filename, strerror(errno));
1037                 free(store.key);
1038                 ret = -1;
1039                 goto out_free;
1040         }
1041
1042         /*
1043          * If .git/config does not exist yet, write a minimal version.
1044          */
1045         in_fd = open(config_filename, O_RDONLY);
1046         if ( in_fd < 0 ) {
1047                 free(store.key);
1048
1049                 if ( ENOENT != errno ) {
1050                         error("opening %s: %s", config_filename,
1051                               strerror(errno));
1052                         ret = 3; /* same as "invalid config file" */
1053                         goto out_free;
1054                 }
1055                 /* if nothing to unset, error out */
1056                 if (value == NULL) {
1057                         ret = 5;
1058                         goto out_free;
1059                 }
1060
1061                 store.key = (char *)key;
1062                 if (!store_write_section(fd, key) ||
1063                     !store_write_pair(fd, key, value))
1064                         goto write_err_out;
1065         } else {
1066                 struct stat st;
1067                 char *contents;
1068                 size_t contents_sz, copy_begin, copy_end;
1069                 int i, new_line = 0;
1070
1071                 if (value_regex == NULL)
1072                         store.value_regex = NULL;
1073                 else {
1074                         if (value_regex[0] == '!') {
1075                                 store.do_not_match = 1;
1076                                 value_regex++;
1077                         } else
1078                                 store.do_not_match = 0;
1079
1080                         store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1081                         if (regcomp(store.value_regex, value_regex,
1082                                         REG_EXTENDED)) {
1083                                 error("invalid pattern: %s", value_regex);
1084                                 free(store.value_regex);
1085                                 ret = 6;
1086                                 goto out_free;
1087                         }
1088                 }
1089
1090                 store.offset[0] = 0;
1091                 store.state = START;
1092                 store.seen = 0;
1093
1094                 /*
1095                  * After this, store.offset will contain the *end* offset
1096                  * of the last match, or remain at 0 if no match was found.
1097                  * As a side effect, we make sure to transform only a valid
1098                  * existing config file.
1099                  */
1100                 if (git_config_from_file(store_aux, config_filename, NULL)) {
1101                         error("invalid config file %s", config_filename);
1102                         free(store.key);
1103                         if (store.value_regex != NULL) {
1104                                 regfree(store.value_regex);
1105                                 free(store.value_regex);
1106                         }
1107                         ret = 3;
1108                         goto out_free;
1109                 }
1110
1111                 free(store.key);
1112                 if (store.value_regex != NULL) {
1113                         regfree(store.value_regex);
1114                         free(store.value_regex);
1115                 }
1116
1117                 /* if nothing to unset, or too many matches, error out */
1118                 if ((store.seen == 0 && value == NULL) ||
1119                                 (store.seen > 1 && multi_replace == 0)) {
1120                         ret = 5;
1121                         goto out_free;
1122                 }
1123
1124                 fstat(in_fd, &st);
1125                 contents_sz = xsize_t(st.st_size);
1126                 contents = xmmap(NULL, contents_sz, PROT_READ,
1127                         MAP_PRIVATE, in_fd, 0);
1128                 close(in_fd);
1129
1130                 if (store.seen == 0)
1131                         store.seen = 1;
1132
1133                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1134                         if (store.offset[i] == 0) {
1135                                 store.offset[i] = copy_end = contents_sz;
1136                         } else if (store.state != KEY_SEEN) {
1137                                 copy_end = store.offset[i];
1138                         } else
1139                                 copy_end = find_beginning_of_line(
1140                                         contents, contents_sz,
1141                                         store.offset[i]-2, &new_line);
1142
1143                         if (copy_end > 0 && contents[copy_end-1] != '\n')
1144                                 new_line = 1;
1145
1146                         /* write the first part of the config */
1147                         if (copy_end > copy_begin) {
1148                                 if (write_in_full(fd, contents + copy_begin,
1149                                                   copy_end - copy_begin) <
1150                                     copy_end - copy_begin)
1151                                         goto write_err_out;
1152                                 if (new_line &&
1153                                     write_str_in_full(fd, "\n") != 1)
1154                                         goto write_err_out;
1155                         }
1156                         copy_begin = store.offset[i];
1157                 }
1158
1159                 /* write the pair (value == NULL means unset) */
1160                 if (value != NULL) {
1161                         if (store.state == START) {
1162                                 if (!store_write_section(fd, key))
1163                                         goto write_err_out;
1164                         }
1165                         if (!store_write_pair(fd, key, value))
1166                                 goto write_err_out;
1167                 }
1168
1169                 /* write the rest of the config */
1170                 if (copy_begin < contents_sz)
1171                         if (write_in_full(fd, contents + copy_begin,
1172                                           contents_sz - copy_begin) <
1173                             contents_sz - copy_begin)
1174                                 goto write_err_out;
1175
1176                 munmap(contents, contents_sz);
1177         }
1178
1179         if (commit_lock_file(lock) < 0) {
1180                 error("could not commit config file %s", config_filename);
1181                 ret = 4;
1182                 goto out_free;
1183         }
1184
1185         /*
1186          * lock is committed, so don't try to roll it back below.
1187          * NOTE: Since lockfile.c keeps a linked list of all created
1188          * lock_file structures, it isn't safe to free(lock).  It's
1189          * better to just leave it hanging around.
1190          */
1191         lock = NULL;
1192         ret = 0;
1193
1194 out_free:
1195         if (lock)
1196                 rollback_lock_file(lock);
1197         free(config_filename);
1198         return ret;
1199
1200 write_err_out:
1201         ret = write_error(lock->filename);
1202         goto out_free;
1203
1204 }
1205
1206 static int section_name_match (const char *buf, const char *name)
1207 {
1208         int i = 0, j = 0, dot = 0;
1209         if (buf[i] != '[')
1210                 return 0;
1211         for (i = 1; buf[i] && buf[i] != ']'; i++) {
1212                 if (!dot && isspace(buf[i])) {
1213                         dot = 1;
1214                         if (name[j++] != '.')
1215                                 break;
1216                         for (i++; isspace(buf[i]); i++)
1217                                 ; /* do nothing */
1218                         if (buf[i] != '"')
1219                                 break;
1220                         continue;
1221                 }
1222                 if (buf[i] == '\\' && dot)
1223                         i++;
1224                 else if (buf[i] == '"' && dot) {
1225                         for (i++; isspace(buf[i]); i++)
1226                                 ; /* do_nothing */
1227                         break;
1228                 }
1229                 if (buf[i] != name[j++])
1230                         break;
1231         }
1232         if (buf[i] == ']' && name[j] == 0) {
1233                 /*
1234                  * We match, now just find the right length offset by
1235                  * gobbling up any whitespace after it, as well
1236                  */
1237                 i++;
1238                 for (; buf[i] && isspace(buf[i]); i++)
1239                         ; /* do nothing */
1240                 return i;
1241         }
1242         return 0;
1243 }
1244
1245 /* if new_name == NULL, the section is removed instead */
1246 int git_config_rename_section(const char *old_name, const char *new_name)
1247 {
1248         int ret = 0, remove = 0;
1249         char *config_filename;
1250         struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1251         int out_fd;
1252         char buf[1024];
1253
1254         if (config_exclusive_filename)
1255                 config_filename = xstrdup(config_exclusive_filename);
1256         else
1257                 config_filename = git_pathdup("config");
1258         out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1259         if (out_fd < 0) {
1260                 ret = error("could not lock config file %s", config_filename);
1261                 goto out;
1262         }
1263
1264         if (!(config_file = fopen(config_filename, "rb"))) {
1265                 /* no config file means nothing to rename, no error */
1266                 goto unlock_and_out;
1267         }
1268
1269         while (fgets(buf, sizeof(buf), config_file)) {
1270                 int i;
1271                 int length;
1272                 char *output = buf;
1273                 for (i = 0; buf[i] && isspace(buf[i]); i++)
1274                         ; /* do nothing */
1275                 if (buf[i] == '[') {
1276                         /* it's a section */
1277                         int offset = section_name_match(&buf[i], old_name);
1278                         if (offset > 0) {
1279                                 ret++;
1280                                 if (new_name == NULL) {
1281                                         remove = 1;
1282                                         continue;
1283                                 }
1284                                 store.baselen = strlen(new_name);
1285                                 if (!store_write_section(out_fd, new_name)) {
1286                                         ret = write_error(lock->filename);
1287                                         goto out;
1288                                 }
1289                                 /*
1290                                  * We wrote out the new section, with
1291                                  * a newline, now skip the old
1292                                  * section's length
1293                                  */
1294                                 output += offset + i;
1295                                 if (strlen(output) > 0) {
1296                                         /*
1297                                          * More content means there's
1298                                          * a declaration to put on the
1299                                          * next line; indent with a
1300                                          * tab
1301                                          */
1302                                         output -= 1;
1303                                         output[0] = '\t';
1304                                 }
1305                         }
1306                         remove = 0;
1307                 }
1308                 if (remove)
1309                         continue;
1310                 length = strlen(output);
1311                 if (write_in_full(out_fd, output, length) != length) {
1312                         ret = write_error(lock->filename);
1313                         goto out;
1314                 }
1315         }
1316         fclose(config_file);
1317  unlock_and_out:
1318         if (commit_lock_file(lock) < 0)
1319                 ret = error("could not commit config file %s", config_filename);
1320  out:
1321         free(config_filename);
1322         return ret;
1323 }
1324
1325 /*
1326  * Call this to report error for your variable that should not
1327  * get a boolean value (i.e. "[my] var" means "true").
1328  */
1329 int config_error_nonbool(const char *var)
1330 {
1331         return error("Missing value for '%s'", var);
1332 }