config.c

   1 /*
   2  * GIT - The information manager from hell
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  * Copyright (C) Johannes Schindelin, 2005
   6  *
   7  */
   8 #include "cache.h"
   9 #include "exec_cmd.h"
  10 #include "strbuf.h"
  11 #include "quote.h"
  12
  13 #define MAXNAME (256)
  14
  15 typedef struct config_file {
  16         struct config_file *prev;
  17         FILE *f;
  18         const char *name;
  19         int linenr;
  20         int eof;
  21         struct strbuf value;
  22         char var[MAXNAME];
  23 } config_file;
  24
  25 static config_file *cf;
  26
  27 static int zlib_compression_seen;
  28
  29 const char *config_exclusive_filename = NULL;
  30
  31 #define MAX_INCLUDE_DEPTH 10
  32 static const char include_depth_advice[] =
  33 "exceeded maximum include depth (%d) while including\n"
  34 "       %s\n"
  35 "from\n"
  36 "       %s\n"
  37 "Do you have circular includes?";
  38 static int handle_path_include(const char *path, struct config_include_data *inc)
  39 {
  40         int ret = 0;
  41         struct strbuf buf = STRBUF_INIT;
  42
  43         /*
  44          * Use an absolute path as-is, but interpret relative paths
  45          * based on the including config file.
  46          */
  47         if (!is_absolute_path(path)) {
  48                 char *slash;
  49
  50                 if (!cf || !cf->name)
  51                         return error("relative config includes must come from files");
  52
  53                 slash = find_last_dir_sep(cf->name);
  54                 if (slash)
  55                         strbuf_add(&buf, cf->name, slash - cf->name + 1);
  56                 strbuf_addstr(&buf, path);
  57                 path = buf.buf;
  58         }
  59
  60         if (!access(path, R_OK)) {
  61                 if (++inc->depth > MAX_INCLUDE_DEPTH)
  62                         die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
  63                             cf && cf->name ? cf->name : "the command line");
  64                 ret = git_config_from_file(git_config_include, path, inc);
  65                 inc->depth--;
  66         }
  67         strbuf_release(&buf);
  68         return ret;
  69 }
  70
  71 int git_config_include(const char *var, const char *value, void *data)
  72 {
  73         struct config_include_data *inc = data;
  74         const char *type;
  75         int ret;
  76
  77         /*
  78          * Pass along all values, including "include" directives; this makes it
  79          * possible to query information on the includes themselves.
  80          */
  81         ret = inc->fn(var, value, inc->data);
  82         if (ret < 0)
  83                 return ret;
  84
  85         type = skip_prefix(var, "include.");
  86         if (!type)
  87                 return ret;
  88
  89         if (!strcmp(type, "path"))
  90                 ret = handle_path_include(value, inc);
  91         return ret;
  92 }
  93
  94 static void lowercase(char *p)
  95 {
  96         for (; *p; p++)
  97                 *p = tolower(*p);
  98 }
  99
 100 void git_config_push_parameter(const char *text)
 101 {
 102         struct strbuf env = STRBUF_INIT;
 103         const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
 104         if (old) {
 105                 strbuf_addstr(&env, old);
 106                 strbuf_addch(&env, ' ');
 107         }
 108         sq_quote_buf(&env, text);
 109         setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
 110         strbuf_release(&env);
 111 }
 112
 113 int git_config_parse_parameter(const char *text,
 114                                config_fn_t fn, void *data)
 115 {
 116         struct strbuf **pair;
 117         pair = strbuf_split_str(text, '=', 2);
 118         if (!pair[0])
 119                 return error("bogus config parameter: %s", text);
 120         if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
 121                 strbuf_setlen(pair[0], pair[0]->len - 1);
 122         strbuf_trim(pair[0]);
 123         if (!pair[0]->len) {
 124                 strbuf_list_free(pair);
 125                 return error("bogus config parameter: %s", text);
 126         }
 127         lowercase(pair[0]->buf);
 128         if (fn(pair[0]->buf, pair[1] ? pair[1]->buf : NULL, data) < 0) {
 129                 strbuf_list_free(pair);
 130                 return -1;
 131         }
 132         strbuf_list_free(pair);
 133         return 0;
 134 }
 135
 136 int git_config_from_parameters(config_fn_t fn, void *data)
 137 {
 138         const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 139         char *envw;
 140         const char **argv = NULL;
 141         int nr = 0, alloc = 0;
 142         int i;
 143
 144         if (!env)
 145                 return 0;
 146         /* sq_dequote will write over it */
 147         envw = xstrdup(env);
 148
 149         if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 150                 free(envw);
 151                 return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
 152         }
 153
 154         for (i = 0; i < nr; i++) {
 155                 if (git_config_parse_parameter(argv[i], fn, data) < 0) {
 156                         free(argv);
 157                         free(envw);
 158                         return -1;
 159                 }
 160         }
 161
 162         free(argv);
 163         free(envw);
 164         return nr > 0;
 165 }
 166
 167 static int get_next_char(void)
 168 {
 169         int c;
 170         FILE *f;
 171
 172         c = '\n';
 173         if (cf && ((f = cf->f) != NULL)) {
 174                 c = fgetc(f);
 175                 if (c == '\r') {
 176                         /* DOS like systems */
 177                         c = fgetc(f);
 178                         if (c != '\n') {
 179                                 ungetc(c, f);
 180                                 c = '\r';
 181                         }
 182                 }
 183                 if (c == '\n')
 184                         cf->linenr++;
 185                 if (c == EOF) {
 186                         cf->eof = 1;
 187                         c = '\n';
 188                 }
 189         }
 190         return c;
 191 }
 192
 193 static char *parse_value(void)
 194 {
 195         int quote = 0, comment = 0, space = 0;
 196
 197         strbuf_reset(&cf->value);
 198         for (;;) {
 199                 int c = get_next_char();
 200                 if (c == '\n') {
 201                         if (quote)
 202                                 return NULL;
 203                         return cf->value.buf;
 204                 }
 205                 if (comment)
 206                         continue;
 207                 if (isspace(c) && !quote) {
 208                         if (cf->value.len)
 209                                 space++;
 210                         continue;
 211                 }
 212                 if (!quote) {
 213                         if (c == ';' || c == '#') {
 214                                 comment = 1;
 215                                 continue;
 216                         }
 217                 }
 218                 for (; space; space--)
 219                         strbuf_addch(&cf->value, ' ');
 220                 if (c == '\\') {
 221                         c = get_next_char();
 222                         switch (c) {
 223                         case '\n':
 224                                 continue;
 225                         case 't':
 226                                 c = '\t';
 227                                 break;
 228                         case 'b':
 229                                 c = '\b';
 230                                 break;
 231                         case 'n':
 232                                 c = '\n';
 233                                 break;
 234                         /* Some characters escape as themselves */
 235                         case '\\': case '"':
 236                                 break;
 237                         /* Reject unknown escape sequences */
 238                         default:
 239                                 return NULL;
 240                         }
 241                         strbuf_addch(&cf->value, c);
 242                         continue;
 243                 }
 244                 if (c == '"') {
 245                         quote = 1-quote;
 246                         continue;
 247                 }
 248                 strbuf_addch(&cf->value, c);
 249         }
 250 }
 251
 252 static inline int iskeychar(int c)
 253 {
 254         return isalnum(c) || c == '-';
 255 }
 256
 257 static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
 258 {
 259         int c;
 260         char *value;
 261
 262         /* Get the full name */
 263         for (;;) {
 264                 c = get_next_char();
 265                 if (cf->eof)
 266                         break;
 267                 if (!iskeychar(c))
 268                         break;
 269                 name[len++] = tolower(c);
 270                 if (len >= MAXNAME)
 271                         return -1;
 272         }
 273         name[len] = 0;
 274         while (c == ' ' || c == '\t')
 275                 c = get_next_char();
 276
 277         value = NULL;
 278         if (c != '\n') {
 279                 if (c != '=')
 280                         return -1;
 281                 value = parse_value();
 282                 if (!value)
 283                         return -1;
 284         }
 285         return fn(name, value, data);
 286 }
 287
 288 static int get_extended_base_var(char *name, int baselen, int c)
 289 {
 290         do {
 291                 if (c == '\n')
 292                         return -1;
 293                 c = get_next_char();
 294         } while (isspace(c));
 295
 296         /* We require the format to be '[base "extension"]' */
 297         if (c != '"')
 298                 return -1;
 299         name[baselen++] = '.';
 300
 301         for (;;) {
 302                 int c = get_next_char();
 303                 if (c == '\n')
 304                         return -1;
 305                 if (c == '"')
 306                         break;
 307                 if (c == '\\') {
 308                         c = get_next_char();
 309                         if (c == '\n')
 310                                 return -1;
 311                 }
 312                 name[baselen++] = c;
 313                 if (baselen > MAXNAME / 2)
 314                         return -1;
 315         }
 316
 317         /* Final ']' */
 318         if (get_next_char() != ']')
 319                 return -1;
 320         return baselen;
 321 }
 322
 323 static int get_base_var(char *name)
 324 {
 325         int baselen = 0;
 326
 327         for (;;) {
 328                 int c = get_next_char();
 329                 if (cf->eof)
 330                         return -1;
 331                 if (c == ']')
 332                         return baselen;
 333                 if (isspace(c))
 334                         return get_extended_base_var(name, baselen, c);
 335                 if (!iskeychar(c) && c != '.')
 336                         return -1;
 337                 if (baselen > MAXNAME / 2)
 338                         return -1;
 339                 name[baselen++] = tolower(c);
 340         }
 341 }
 342
 343 static int git_parse_file(config_fn_t fn, void *data)
 344 {
 345         int comment = 0;
 346         int baselen = 0;
 347         char *var = cf->var;
 348
 349         /* U+FEFF Byte Order Mark in UTF8 */
 350         static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 351         const unsigned char *bomptr = utf8_bom;
 352
 353         for (;;) {
 354                 int c = get_next_char();
 355                 if (bomptr && *bomptr) {
 356                         /* We are at the file beginning; skip UTF8-encoded BOM
 357                          * if present. Sane editors won't put this in on their
 358                          * own, but e.g. Windows Notepad will do it happily. */
 359                         if ((unsigned char) c == *bomptr) {
 360                                 bomptr++;
 361                                 continue;
 362                         } else {
 363                                 /* Do not tolerate partial BOM. */
 364                                 if (bomptr != utf8_bom)
 365                                         break;
 366                                 /* No BOM at file beginning. Cool. */
 367                                 bomptr = NULL;
 368                         }
 369                 }
 370                 if (c == '\n') {
 371                         if (cf->eof)
 372                                 return 0;
 373                         comment = 0;
 374                         continue;
 375                 }
 376                 if (comment || isspace(c))
 377                         continue;
 378                 if (c == '#' || c == ';') {
 379                         comment = 1;
 380                         continue;
 381                 }
 382                 if (c == '[') {
 383                         baselen = get_base_var(var);
 384                         if (baselen <= 0)
 385                                 break;
 386                         var[baselen++] = '.';
 387                         var[baselen] = 0;
 388                         continue;
 389                 }
 390                 if (!isalpha(c))
 391                         break;
 392                 var[baselen] = tolower(c);
 393                 if (get_value(fn, data, var, baselen+1) < 0)
 394                         break;
 395         }
 396         die("bad config file line %d in %s", cf->linenr, cf->name);
 397 }
 398
 399 static int parse_unit_factor(const char *end, uintmax_t *val)
 400 {
 401         if (!*end)
 402                 return 1;
 403         else if (!strcasecmp(end, "k")) {
 404                 *val *= 1024;
 405                 return 1;
 406         }
 407         else if (!strcasecmp(end, "m")) {
 408                 *val *= 1024 * 1024;
 409                 return 1;
 410         }
 411         else if (!strcasecmp(end, "g")) {
 412                 *val *= 1024 * 1024 * 1024;
 413                 return 1;
 414         }
 415         return 0;
 416 }
 417
 418 static int git_parse_long(const char *value, long *ret)
 419 {
 420         if (value && *value) {
 421                 char *end;
 422                 intmax_t val;
 423                 uintmax_t uval;
 424                 uintmax_t factor = 1;
 425
 426                 errno = 0;
 427                 val = strtoimax(value, &end, 0);
 428                 if (errno == ERANGE)
 429                         return 0;
 430                 if (!parse_unit_factor(end, &factor))
 431                         return 0;
 432                 uval = abs(val);
 433                 uval *= factor;
 434                 if ((uval > maximum_signed_value_of_type(long)) ||
 435                     (abs(val) > uval))
 436                         return 0;
 437                 val *= factor;
 438                 *ret = val;
 439                 return 1;
 440         }
 441         return 0;
 442 }
 443
 444 int git_parse_ulong(const char *value, unsigned long *ret)
 445 {
 446         if (value && *value) {
 447                 char *end;
 448                 uintmax_t val;
 449                 uintmax_t oldval;
 450
 451                 errno = 0;
 452                 val = strtoumax(value, &end, 0);
 453                 if (errno == ERANGE)
 454                         return 0;
 455                 oldval = val;
 456                 if (!parse_unit_factor(end, &val))
 457                         return 0;
 458                 if ((val > maximum_unsigned_value_of_type(long)) ||
 459                     (oldval > val))
 460                         return 0;
 461                 *ret = val;
 462                 return 1;
 463         }
 464         return 0;
 465 }
 466
 467 static void die_bad_config(const char *name)
 468 {
 469         if (cf && cf->name)
 470                 die("bad config value for '%s' in %s", name, cf->name);
 471         die("bad config value for '%s'", name);
 472 }
 473
 474 int git_config_int(const char *name, const char *value)
 475 {
 476         long ret = 0;
 477         if (!git_parse_long(value, &ret))
 478                 die_bad_config(name);
 479         return ret;
 480 }
 481
 482 unsigned long git_config_ulong(const char *name, const char *value)
 483 {
 484         unsigned long ret;
 485         if (!git_parse_ulong(value, &ret))
 486                 die_bad_config(name);
 487         return ret;
 488 }
 489
 490 static int git_config_maybe_bool_text(const char *name, const char *value)
 491 {
 492         if (!value)
 493                 return 1;
 494         if (!*value)
 495                 return 0;
 496         if (!strcasecmp(value, "true")
 497             || !strcasecmp(value, "yes")
 498             || !strcasecmp(value, "on"))
 499                 return 1;
 500         if (!strcasecmp(value, "false")
 501             || !strcasecmp(value, "no")
 502             || !strcasecmp(value, "off"))
 503                 return 0;
 504         return -1;
 505 }
 506
 507 int git_config_maybe_bool(const char *name, const char *value)
 508 {
 509         long v = git_config_maybe_bool_text(name, value);
 510         if (0 <= v)
 511                 return v;
 512         if (git_parse_long(value, &v))
 513                 return !!v;
 514         return -1;
 515 }
 516
 517 int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 518 {
 519         int v = git_config_maybe_bool_text(name, value);
 520         if (0 <= v) {
 521                 *is_bool = 1;
 522                 return v;
 523         }
 524         *is_bool = 0;
 525         return git_config_int(name, value);
 526 }
 527
 528 int git_config_bool(const char *name, const char *value)
 529 {
 530         int discard;
 531         return !!git_config_bool_or_int(name, value, &discard);
 532 }
 533
 534 int git_config_string(const char **dest, const char *var, const char *value)
 535 {
 536         if (!value)
 537                 return config_error_nonbool(var);
 538         *dest = xstrdup(value);
 539         return 0;
 540 }
 541
 542 int git_config_pathname(const char **dest, const char *var, const char *value)
 543 {
 544         if (!value)
 545                 return config_error_nonbool(var);
 546         *dest = expand_user_path(value);
 547         if (!*dest)
 548                 die("Failed to expand user dir in: '%s'", value);
 549         return 0;
 550 }
 551
 552 static int git_default_core_config(const char *var, const char *value)
 553 {
 554         /* This needs a better name */
 555         if (!strcmp(var, "core.filemode")) {
 556                 trust_executable_bit = git_config_bool(var, value);
 557                 return 0;
 558         }
 559         if (!strcmp(var, "core.trustctime")) {
 560                 trust_ctime = git_config_bool(var, value);
 561                 return 0;
 562         }
 563
 564         if (!strcmp(var, "core.quotepath")) {
 565                 quote_path_fully = git_config_bool(var, value);
 566                 return 0;
 567         }
 568
 569         if (!strcmp(var, "core.symlinks")) {
 570                 has_symlinks = git_config_bool(var, value);
 571                 return 0;
 572         }
 573
 574         if (!strcmp(var, "core.ignorecase")) {
 575                 ignore_case = git_config_bool(var, value);
 576                 return 0;
 577         }
 578
 579         if (!strcmp(var, "core.attributesfile"))
 580                 return git_config_pathname(&git_attributes_file, var, value);
 581
 582         if (!strcmp(var, "core.bare")) {
 583                 is_bare_repository_cfg = git_config_bool(var, value);
 584                 return 0;
 585         }
 586
 587         if (!strcmp(var, "core.ignorestat")) {
 588                 assume_unchanged = git_config_bool(var, value);
 589                 return 0;
 590         }
 591
 592         if (!strcmp(var, "core.prefersymlinkrefs")) {
 593                 prefer_symlink_refs = git_config_bool(var, value);
 594                 return 0;
 595         }
 596
 597         if (!strcmp(var, "core.logallrefupdates")) {
 598                 log_all_ref_updates = git_config_bool(var, value);
 599                 return 0;
 600         }
 601
 602         if (!strcmp(var, "core.warnambiguousrefs")) {
 603                 warn_ambiguous_refs = git_config_bool(var, value);
 604                 return 0;
 605         }
 606
 607         if (!strcmp(var, "core.abbrev")) {
 608                 int abbrev = git_config_int(var, value);
 609                 if (abbrev < minimum_abbrev || abbrev > 40)
 610                         return -1;
 611                 default_abbrev = abbrev;
 612                 return 0;
 613         }
 614
 615         if (!strcmp(var, "core.loosecompression")) {
 616                 int level = git_config_int(var, value);
 617                 if (level == -1)
 618                         level = Z_DEFAULT_COMPRESSION;
 619                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 620                         die("bad zlib compression level %d", level);
 621                 zlib_compression_level = level;
 622                 zlib_compression_seen = 1;
 623                 return 0;
 624         }
 625
 626         if (!strcmp(var, "core.compression")) {
 627                 int level = git_config_int(var, value);
 628                 if (level == -1)
 629                         level = Z_DEFAULT_COMPRESSION;
 630                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 631                         die("bad zlib compression level %d", level);
 632                 core_compression_level = level;
 633                 core_compression_seen = 1;
 634                 if (!zlib_compression_seen)
 635                         zlib_compression_level = level;
 636                 return 0;
 637         }
 638
 639         if (!strcmp(var, "core.packedgitwindowsize")) {
 640                 int pgsz_x2 = getpagesize() * 2;
 641                 packed_git_window_size = git_config_ulong(var, value);
 642
 643                 /* This value must be multiple of (pagesize * 2) */
 644                 packed_git_window_size /= pgsz_x2;
 645                 if (packed_git_window_size < 1)
 646                         packed_git_window_size = 1;
 647                 packed_git_window_size *= pgsz_x2;
 648                 return 0;
 649         }
 650
 651         if (!strcmp(var, "core.bigfilethreshold")) {
 652                 big_file_threshold = git_config_ulong(var, value);
 653                 return 0;
 654         }
 655
 656         if (!strcmp(var, "core.packedgitlimit")) {
 657                 packed_git_limit = git_config_ulong(var, value);
 658                 return 0;
 659         }
 660
 661         if (!strcmp(var, "core.deltabasecachelimit")) {
 662                 delta_base_cache_limit = git_config_ulong(var, value);
 663                 return 0;
 664         }
 665
 666         if (!strcmp(var, "core.logpackaccess"))
 667                 return git_config_string(&log_pack_access, var, value);
 668
 669         if (!strcmp(var, "core.autocrlf")) {
 670                 if (value && !strcasecmp(value, "input")) {
 671                         if (core_eol == EOL_CRLF)
 672                                 return error("core.autocrlf=input conflicts with core.eol=crlf");
 673                         auto_crlf = AUTO_CRLF_INPUT;
 674                         return 0;
 675                 }
 676                 auto_crlf = git_config_bool(var, value);
 677                 return 0;
 678         }
 679
 680         if (!strcmp(var, "core.safecrlf")) {
 681                 if (value && !strcasecmp(value, "warn")) {
 682                         safe_crlf = SAFE_CRLF_WARN;
 683                         return 0;
 684                 }
 685                 safe_crlf = git_config_bool(var, value);
 686                 return 0;
 687         }
 688
 689         if (!strcmp(var, "core.eol")) {
 690                 if (value && !strcasecmp(value, "lf"))
 691                         core_eol = EOL_LF;
 692                 else if (value && !strcasecmp(value, "crlf"))
 693                         core_eol = EOL_CRLF;
 694                 else if (value && !strcasecmp(value, "native"))
 695                         core_eol = EOL_NATIVE;
 696                 else
 697                         core_eol = EOL_UNSET;
 698                 if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 699                         return error("core.autocrlf=input conflicts with core.eol=crlf");
 700                 return 0;
 701         }
 702
 703         if (!strcmp(var, "core.notesref")) {
 704                 notes_ref_name = xstrdup(value);
 705                 return 0;
 706         }
 707
 708         if (!strcmp(var, "core.pager"))
 709                 return git_config_string(&pager_program, var, value);
 710
 711         if (!strcmp(var, "core.editor"))
 712                 return git_config_string(&editor_program, var, value);
 713
 714         if (!strcmp(var, "core.askpass"))
 715                 return git_config_string(&askpass_program, var, value);
 716
 717         if (!strcmp(var, "core.excludesfile"))
 718                 return git_config_pathname(&excludes_file, var, value);
 719
 720         if (!strcmp(var, "core.whitespace")) {
 721                 if (!value)
 722                         return config_error_nonbool(var);
 723                 whitespace_rule_cfg = parse_whitespace_rule(value);
 724                 return 0;
 725         }
 726
 727         if (!strcmp(var, "core.fsyncobjectfiles")) {
 728                 fsync_object_files = git_config_bool(var, value);
 729                 return 0;
 730         }
 731
 732         if (!strcmp(var, "core.preloadindex")) {
 733                 core_preload_index = git_config_bool(var, value);
 734                 return 0;
 735         }
 736
 737         if (!strcmp(var, "core.createobject")) {
 738                 if (!strcmp(value, "rename"))
 739                         object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 740                 else if (!strcmp(value, "link"))
 741                         object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 742                 else
 743                         die("Invalid mode for object creation: %s", value);
 744                 return 0;
 745         }
 746
 747         if (!strcmp(var, "core.sparsecheckout")) {
 748                 core_apply_sparse_checkout = git_config_bool(var, value);
 749                 return 0;
 750         }
 751
 752         if (!strcmp(var, "core.hidedotfiles")) {
 753                 if (value && !strcasecmp(value, "dotgitonly")) {
 754                         hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
 755                         return 0;
 756                 }
 757                 hide_dotfiles = git_config_bool(var, value);
 758                 return 0;
 759         }
 760
 761         /* Add other config variables here and to Documentation/config.txt. */
 762         return 0;
 763 }
 764
 765 static int git_default_user_config(const char *var, const char *value)
 766 {
 767         if (!strcmp(var, "user.name")) {
 768                 if (!value)
 769                         return config_error_nonbool(var);
 770                 strlcpy(git_default_name, value, sizeof(git_default_name));
 771                 user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 772                 return 0;
 773         }
 774
 775         if (!strcmp(var, "user.email")) {
 776                 if (!value)
 777                         return config_error_nonbool(var);
 778                 strlcpy(git_default_email, value, sizeof(git_default_email));
 779                 user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 780                 return 0;
 781         }
 782
 783         /* Add other config variables here and to Documentation/config.txt. */
 784         return 0;
 785 }
 786
 787 static int git_default_i18n_config(const char *var, const char *value)
 788 {
 789         if (!strcmp(var, "i18n.commitencoding"))
 790                 return git_config_string(&git_commit_encoding, var, value);
 791
 792         if (!strcmp(var, "i18n.logoutputencoding"))
 793                 return git_config_string(&git_log_output_encoding, var, value);
 794
 795         /* Add other config variables here and to Documentation/config.txt. */
 796         return 0;
 797 }
 798
 799 static int git_default_branch_config(const char *var, const char *value)
 800 {
 801         if (!strcmp(var, "branch.autosetupmerge")) {
 802                 if (value && !strcasecmp(value, "always")) {
 803                         git_branch_track = BRANCH_TRACK_ALWAYS;
 804                         return 0;
 805                 }
 806                 git_branch_track = git_config_bool(var, value);
 807                 return 0;
 808         }
 809         if (!strcmp(var, "branch.autosetuprebase")) {
 810                 if (!value)
 811                         return config_error_nonbool(var);
 812                 else if (!strcmp(value, "never"))
 813                         autorebase = AUTOREBASE_NEVER;
 814                 else if (!strcmp(value, "local"))
 815                         autorebase = AUTOREBASE_LOCAL;
 816                 else if (!strcmp(value, "remote"))
 817                         autorebase = AUTOREBASE_REMOTE;
 818                 else if (!strcmp(value, "always"))
 819                         autorebase = AUTOREBASE_ALWAYS;
 820                 else
 821                         return error("Malformed value for %s", var);
 822                 return 0;
 823         }
 824
 825         /* Add other config variables here and to Documentation/config.txt. */
 826         return 0;
 827 }
 828
 829 static int git_default_push_config(const char *var, const char *value)
 830 {
 831         if (!strcmp(var, "push.default")) {
 832                 if (!value)
 833                         return config_error_nonbool(var);
 834                 else if (!strcmp(value, "nothing"))
 835                         push_default = PUSH_DEFAULT_NOTHING;
 836                 else if (!strcmp(value, "matching"))
 837                         push_default = PUSH_DEFAULT_MATCHING;
 838                 else if (!strcmp(value, "upstream"))
 839                         push_default = PUSH_DEFAULT_UPSTREAM;
 840                 else if (!strcmp(value, "tracking")) /* deprecated */
 841                         push_default = PUSH_DEFAULT_UPSTREAM;
 842                 else if (!strcmp(value, "current"))
 843                         push_default = PUSH_DEFAULT_CURRENT;
 844                 else {
 845                         error("Malformed value for %s: %s", var, value);
 846                         return error("Must be one of nothing, matching, "
 847                                      "tracking or current.");
 848                 }
 849                 return 0;
 850         }
 851
 852         /* Add other config variables here and to Documentation/config.txt. */
 853         return 0;
 854 }
 855
 856 static int git_default_mailmap_config(const char *var, const char *value)
 857 {
 858         if (!strcmp(var, "mailmap.file"))
 859                 return git_config_string(&git_mailmap_file, var, value);
 860
 861         /* Add other config variables here and to Documentation/config.txt. */
 862         return 0;
 863 }
 864
 865 int git_default_config(const char *var, const char *value, void *dummy)
 866 {
 867         if (!prefixcmp(var, "core."))
 868                 return git_default_core_config(var, value);
 869
 870         if (!prefixcmp(var, "user."))
 871                 return git_default_user_config(var, value);
 872
 873         if (!prefixcmp(var, "i18n."))
 874                 return git_default_i18n_config(var, value);
 875
 876         if (!prefixcmp(var, "branch."))
 877                 return git_default_branch_config(var, value);
 878
 879         if (!prefixcmp(var, "push."))
 880                 return git_default_push_config(var, value);
 881
 882         if (!prefixcmp(var, "mailmap."))
 883                 return git_default_mailmap_config(var, value);
 884
 885         if (!prefixcmp(var, "advice."))
 886                 return git_default_advice_config(var, value);
 887
 888         if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 889                 pager_use_color = git_config_bool(var,value);
 890                 return 0;
 891         }
 892
 893         if (!strcmp(var, "pack.packsizelimit")) {
 894                 pack_size_limit_cfg = git_config_ulong(var, value);
 895                 return 0;
 896         }
 897         /* Add other config variables here and to Documentation/config.txt. */
 898         return 0;
 899 }
 900
 901 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 902 {
 903         int ret;
 904         FILE *f = fopen(filename, "r");
 905
 906         ret = -1;
 907         if (f) {
 908                 config_file top;
 909
 910                 /* push config-file parsing state stack */
 911                 top.prev = cf;
 912                 top.f = f;
 913                 top.name = filename;
 914                 top.linenr = 1;
 915                 top.eof = 0;
 916                 strbuf_init(&top.value, 1024);
 917                 cf = &top;
 918
 919                 ret = git_parse_file(fn, data);
 920
 921                 /* pop config-file parsing state stack */
 922                 strbuf_release(&top.value);
 923                 cf = top.prev;
 924
 925                 fclose(f);
 926         }
 927         return ret;
 928 }
 929
 930 const char *git_etc_gitconfig(void)
 931 {
 932         static const char *system_wide;
 933         if (!system_wide)
 934                 system_wide = system_path(ETC_GITCONFIG);
 935         return system_wide;
 936 }
 937
 938 int git_env_bool(const char *k, int def)
 939 {
 940         const char *v = getenv(k);
 941         return v ? git_config_bool(k, v) : def;
 942 }
 943
 944 int git_config_system(void)
 945 {
 946         return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 947 }
 948
 949 int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 950 {
 951         int ret = 0, found = 0;
 952         const char *home = NULL;
 953
 954         /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
 955         if (config_exclusive_filename)
 956                 return git_config_from_file(fn, config_exclusive_filename, data);
 957         if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 958                 ret += git_config_from_file(fn, git_etc_gitconfig(),
 959                                             data);
 960                 found += 1;
 961         }
 962
 963         home = get_home_directory();
 964         if (home) {
 965                 char buf[PATH_MAX];
 966                 char *user_config = mksnpath(buf, sizeof(buf), "%s/.gitconfig", home);
 967                 if (!access(user_config, R_OK)) {
 968                         ret += git_config_from_file(fn, user_config, data);
 969                         found += 1;
 970                 }
 971         }
 972
 973         if (repo_config && !access(repo_config, R_OK)) {
 974                 ret += git_config_from_file(fn, repo_config, data);
 975                 found += 1;
 976         }
 977
 978         switch (git_config_from_parameters(fn, data)) {
 979         case -1: /* error */
 980                 die("unable to parse command-line config");
 981                 break;
 982         case 0: /* found nothing */
 983                 break;
 984         default: /* found at least one item */
 985                 found++;
 986                 break;
 987         }
 988
 989         return ret == 0 ? found : ret;
 990 }
 991
 992 int git_config(config_fn_t fn, void *data)
 993 {
 994         char *repo_config = NULL;
 995         int ret;
 996         struct config_include_data inc = CONFIG_INCLUDE_INIT;
 997
 998         inc.fn = fn;
 999         inc.data = data;
1000
1001         repo_config = git_pathdup("config");
1002         ret = git_config_early(git_config_include, &inc, repo_config);
1003         if (repo_config)
1004                 free(repo_config);
1005         return ret;
1006 }
1007
1008 /*
1009  * Find all the stuff for git_config_set() below.
1010  */
1011
1012 #define MAX_MATCHES 512
1013
1014 static struct {
1015         int baselen;
1016         char *key;
1017         int do_not_match;
1018         regex_t *value_regex;
1019         int multi_replace;
1020         size_t offset[MAX_MATCHES];
1021         enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1022         int seen;
1023 } store;
1024
1025 static int matches(const char *key, const char *value)
1026 {
1027         return !strcmp(key, store.key) &&
1028                 (store.value_regex == NULL ||
1029                  (store.do_not_match ^
1030                   !regexec(store.value_regex, value, 0, NULL, 0)));
1031 }
1032
1033 static int store_aux(const char *key, const char *value, void *cb)
1034 {
1035         const char *ep;
1036         size_t section_len;
1037         FILE *f = cf->f;
1038
1039         switch (store.state) {
1040         case KEY_SEEN:
1041                 if (matches(key, value)) {
1042                         if (store.seen == 1 && store.multi_replace == 0) {
1043                                 warning("%s has multiple values", key);
1044                         } else if (store.seen >= MAX_MATCHES) {
1045                                 error("too many matches for %s", key);
1046                                 return 1;
1047                         }
1048
1049                         store.offset[store.seen] = ftell(f);
1050                         store.seen++;
1051                 }
1052                 break;
1053         case SECTION_SEEN:
1054                 /*
1055                  * What we are looking for is in store.key (both
1056                  * section and var), and its section part is baselen
1057                  * long.  We found key (again, both section and var).
1058                  * We would want to know if this key is in the same
1059                  * section as what we are looking for.  We already
1060                  * know we are in the same section as what should
1061                  * hold store.key.
1062                  */
1063                 ep = strrchr(key, '.');
1064                 section_len = ep - key;
1065
1066                 if ((section_len != store.baselen) ||
1067                     memcmp(key, store.key, section_len+1)) {
1068                         store.state = SECTION_END_SEEN;
1069                         break;
1070                 }
1071
1072                 /*
1073                  * Do not increment matches: this is no match, but we
1074                  * just made sure we are in the desired section.
1075                  */
1076                 store.offset[store.seen] = ftell(f);
1077                 /* fallthru */
1078         case SECTION_END_SEEN:
1079         case START:
1080                 if (matches(key, value)) {
1081                         store.offset[store.seen] = ftell(f);
1082                         store.state = KEY_SEEN;
1083                         store.seen++;
1084                 } else {
1085                         if (strrchr(key, '.') - key == store.baselen &&
1086                               !strncmp(key, store.key, store.baselen)) {
1087                                         store.state = SECTION_SEEN;
1088                                         store.offset[store.seen] = ftell(f);
1089                         }
1090                 }
1091         }
1092         return 0;
1093 }
1094
1095 static int write_error(const char *filename)
1096 {
1097         error("failed to write new configuration file %s", filename);
1098
1099         /* Same error code as "failed to rename". */
1100         return 4;
1101 }
1102
1103 static int store_write_section(int fd, const char *key)
1104 {
1105         const char *dot;
1106         int i, success;
1107         struct strbuf sb = STRBUF_INIT;
1108
1109         dot = memchr(key, '.', store.baselen);
1110         if (dot) {
1111                 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1112                 for (i = dot - key + 1; i < store.baselen; i++) {
1113                         if (key[i] == '"' || key[i] == '\\')
1114                                 strbuf_addch(&sb, '\\');
1115                         strbuf_addch(&sb, key[i]);
1116                 }
1117                 strbuf_addstr(&sb, "\"]\n");
1118         } else {
1119                 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1120         }
1121
1122         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1123         strbuf_release(&sb);
1124
1125         return success;
1126 }
1127
1128 static int store_write_pair(int fd, const char *key, const char *value)
1129 {
1130         int i, success;
1131         int length = strlen(key + store.baselen + 1);
1132         const char *quote = "";
1133         struct strbuf sb = STRBUF_INIT;
1134
1135         /*
1136          * Check to see if the value needs to be surrounded with a dq pair.
1137          * Note that problematic characters are always backslash-quoted; this
1138          * check is about not losing leading or trailing SP and strings that
1139          * follow beginning-of-comment characters (i.e. ';' and '#') by the
1140          * configuration parser.
1141          */
1142         if (value[0] == ' ')
1143                 quote = "\"";
1144         for (i = 0; value[i]; i++)
1145                 if (value[i] == ';' || value[i] == '#')
1146                         quote = "\"";
1147         if (i && value[i - 1] == ' ')
1148                 quote = "\"";
1149
1150         strbuf_addf(&sb, "\t%.*s = %s",
1151                     length, key + store.baselen + 1, quote);
1152
1153         for (i = 0; value[i]; i++)
1154                 switch (value[i]) {
1155                 case '\n':
1156                         strbuf_addstr(&sb, "\\n");
1157                         break;
1158                 case '\t':
1159                         strbuf_addstr(&sb, "\\t");
1160                         break;
1161                 case '"':
1162                 case '\\':
1163                         strbuf_addch(&sb, '\\');
1164                 default:
1165                         strbuf_addch(&sb, value[i]);
1166                         break;
1167                 }
1168         strbuf_addf(&sb, "%s\n", quote);
1169
1170         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1171         strbuf_release(&sb);
1172
1173         return success;
1174 }
1175
1176 static ssize_t find_beginning_of_line(const char *contents, size_t size,
1177         size_t offset_, int *found_bracket)
1178 {
1179         size_t equal_offset = size, bracket_offset = size;
1180         ssize_t offset;
1181
1182 contline:
1183         for (offset = offset_-2; offset > 0
1184                         && contents[offset] != '\n'; offset--)
1185                 switch (contents[offset]) {
1186                         case '=': equal_offset = offset; break;
1187                         case ']': bracket_offset = offset; break;
1188                 }
1189         if (offset > 0 && contents[offset-1] == '\\') {
1190                 offset_ = offset;
1191                 goto contline;
1192         }
1193         if (bracket_offset < equal_offset) {
1194                 *found_bracket = 1;
1195                 offset = bracket_offset+1;
1196         } else
1197                 offset++;
1198
1199         return offset;
1200 }
1201
1202 int git_config_set_in_file(const char *config_filename,
1203                         const char *key, const char *value)
1204 {
1205         return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1206 }
1207
1208 int git_config_set(const char *key, const char *value)
1209 {
1210         return git_config_set_multivar(key, value, NULL, 0);
1211 }
1212
1213 /*
1214  * Auxiliary function to sanity-check and split the key into the section
1215  * identifier and variable name.
1216  *
1217  * Returns 0 on success, -1 when there is an invalid character in the key and
1218  * -2 if there is no section name in the key.
1219  *
1220  * store_key - pointer to char* which will hold a copy of the key with
1221  *             lowercase section and variable name
1222  * baselen - pointer to int which will hold the length of the
1223  *           section + subsection part, can be NULL
1224  */
1225 int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1226 {
1227         int i, dot, baselen;
1228         const char *last_dot = strrchr(key, '.');
1229
1230         /*
1231          * Since "key" actually contains the section name and the real
1232          * key name separated by a dot, we have to know where the dot is.
1233          */
1234
1235         if (last_dot == NULL || last_dot == key) {
1236                 error("key does not contain a section: %s", key);
1237                 return -CONFIG_NO_SECTION_OR_NAME;
1238         }
1239
1240         if (!last_dot[1]) {
1241                 error("key does not contain variable name: %s", key);
1242                 return -CONFIG_NO_SECTION_OR_NAME;
1243         }
1244
1245         baselen = last_dot - key;
1246         if (baselen_)
1247                 *baselen_ = baselen;
1248
1249         /*
1250          * Validate the key and while at it, lower case it for matching.
1251          */
1252         *store_key = xmalloc(strlen(key) + 1);
1253
1254         dot = 0;
1255         for (i = 0; key[i]; i++) {
1256                 unsigned char c = key[i];
1257                 if (c == '.')
1258                         dot = 1;
1259                 /* Leave the extended basename untouched.. */
1260                 if (!dot || i > baselen) {
1261                         if (!iskeychar(c) ||
1262                             (i == baselen + 1 && !isalpha(c))) {
1263                                 error("invalid key: %s", key);
1264                                 goto out_free_ret_1;
1265                         }
1266                         c = tolower(c);
1267                 } else if (c == '\n') {
1268                         error("invalid key (newline): %s", key);
1269                         goto out_free_ret_1;
1270                 }
1271                 (*store_key)[i] = c;
1272         }
1273         (*store_key)[i] = 0;
1274
1275         return 0;
1276
1277 out_free_ret_1:
1278         free(*store_key);
1279         return -CONFIG_INVALID_KEY;
1280 }
1281
1282 /*
1283  * If value==NULL, unset in (remove from) config,
1284  * if value_regex!=NULL, disregard key/value pairs where value does not match.
1285  * if multi_replace==0, nothing, or only one matching key/value is replaced,
1286  *     else all matching key/values (regardless how many) are removed,
1287  *     before the new pair is written.
1288  *
1289  * Returns 0 on success.
1290  *
1291  * This function does this:
1292  *
1293  * - it locks the config file by creating ".git/config.lock"
1294  *
1295  * - it then parses the config using store_aux() as validator to find
1296  *   the position on the key/value pair to replace. If it is to be unset,
1297  *   it must be found exactly once.
1298  *
1299  * - the config file is mmap()ed and the part before the match (if any) is
1300  *   written to the lock file, then the changed part and the rest.
1301  *
1302  * - the config file is removed and the lock file rename()d to it.
1303  *
1304  */
1305 int git_config_set_multivar_in_file(const char *config_filename,
1306                                 const char *key, const char *value,
1307                                 const char *value_regex, int multi_replace)
1308 {
1309         int fd = -1, in_fd;
1310         int ret;
1311         struct lock_file *lock = NULL;
1312
1313         /* parse-key returns negative; flip the sign to feed exit(3) */
1314         ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1315         if (ret)
1316                 goto out_free;
1317
1318         store.multi_replace = multi_replace;
1319
1320
1321         /*
1322          * The lock serves a purpose in addition to locking: the new
1323          * contents of .git/config will be written into it.
1324          */
1325         lock = xcalloc(sizeof(struct lock_file), 1);
1326         fd = hold_lock_file_for_update(lock, config_filename, 0);
1327         if (fd < 0) {
1328                 error("could not lock config file %s: %s", config_filename, strerror(errno));
1329                 free(store.key);
1330                 ret = CONFIG_NO_LOCK;
1331                 goto out_free;
1332         }
1333
1334         /*
1335          * If .git/config does not exist yet, write a minimal version.
1336          */
1337         in_fd = open(config_filename, O_RDONLY);
1338         if ( in_fd < 0 ) {
1339                 free(store.key);
1340
1341                 if ( ENOENT != errno ) {
1342                         error("opening %s: %s", config_filename,
1343                               strerror(errno));
1344                         ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1345                         goto out_free;
1346                 }
1347                 /* if nothing to unset, error out */
1348                 if (value == NULL) {
1349                         ret = CONFIG_NOTHING_SET;
1350                         goto out_free;
1351                 }
1352
1353                 store.key = (char *)key;
1354                 if (!store_write_section(fd, key) ||
1355                     !store_write_pair(fd, key, value))
1356                         goto write_err_out;
1357         } else {
1358                 struct stat st;
1359                 char *contents;
1360                 size_t contents_sz, copy_begin, copy_end;
1361                 int i, new_line = 0;
1362
1363                 if (value_regex == NULL)
1364                         store.value_regex = NULL;
1365                 else {
1366                         if (value_regex[0] == '!') {
1367                                 store.do_not_match = 1;
1368                                 value_regex++;
1369                         } else
1370                                 store.do_not_match = 0;
1371
1372                         store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1373                         if (regcomp(store.value_regex, value_regex,
1374                                         REG_EXTENDED)) {
1375                                 error("invalid pattern: %s", value_regex);
1376                                 free(store.value_regex);
1377                                 ret = CONFIG_INVALID_PATTERN;
1378                                 goto out_free;
1379                         }
1380                 }
1381
1382                 store.offset[0] = 0;
1383                 store.state = START;
1384                 store.seen = 0;
1385
1386                 /*
1387                  * After this, store.offset will contain the *end* offset
1388                  * of the last match, or remain at 0 if no match was found.
1389                  * As a side effect, we make sure to transform only a valid
1390                  * existing config file.
1391                  */
1392                 if (git_config_from_file(store_aux, config_filename, NULL)) {
1393                         error("invalid config file %s", config_filename);
1394                         free(store.key);
1395                         if (store.value_regex != NULL) {
1396                                 regfree(store.value_regex);
1397                                 free(store.value_regex);
1398                         }
1399                         ret = CONFIG_INVALID_FILE;
1400                         goto out_free;
1401                 }
1402
1403                 free(store.key);
1404                 if (store.value_regex != NULL) {
1405                         regfree(store.value_regex);
1406                         free(store.value_regex);
1407                 }
1408
1409                 /* if nothing to unset, or too many matches, error out */
1410                 if ((store.seen == 0 && value == NULL) ||
1411                                 (store.seen > 1 && multi_replace == 0)) {
1412                         ret = CONFIG_NOTHING_SET;
1413                         goto out_free;
1414                 }
1415
1416                 fstat(in_fd, &st);
1417                 contents_sz = xsize_t(st.st_size);
1418                 contents = xmmap(NULL, contents_sz, PROT_READ,
1419                         MAP_PRIVATE, in_fd, 0);
1420                 close(in_fd);
1421
1422                 if (store.seen == 0)
1423                         store.seen = 1;
1424
1425                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1426                         if (store.offset[i] == 0) {
1427                                 store.offset[i] = copy_end = contents_sz;
1428                         } else if (store.state != KEY_SEEN) {
1429                                 copy_end = store.offset[i];
1430                         } else
1431                                 copy_end = find_beginning_of_line(
1432                                         contents, contents_sz,
1433                                         store.offset[i]-2, &new_line);
1434
1435                         if (copy_end > 0 && contents[copy_end-1] != '\n')
1436                                 new_line = 1;
1437
1438                         /* write the first part of the config */
1439                         if (copy_end > copy_begin) {
1440                                 if (write_in_full(fd, contents + copy_begin,
1441                                                   copy_end - copy_begin) <
1442                                     copy_end - copy_begin)
1443                                         goto write_err_out;
1444                                 if (new_line &&
1445                                     write_str_in_full(fd, "\n") != 1)
1446                                         goto write_err_out;
1447                         }
1448                         copy_begin = store.offset[i];
1449                 }
1450
1451                 /* write the pair (value == NULL means unset) */
1452                 if (value != NULL) {
1453                         if (store.state == START) {
1454                                 if (!store_write_section(fd, key))
1455                                         goto write_err_out;
1456                         }
1457                         if (!store_write_pair(fd, key, value))
1458                                 goto write_err_out;
1459                 }
1460
1461                 /* write the rest of the config */
1462                 if (copy_begin < contents_sz)
1463                         if (write_in_full(fd, contents + copy_begin,
1464                                           contents_sz - copy_begin) <
1465                             contents_sz - copy_begin)
1466                                 goto write_err_out;
1467
1468                 munmap(contents, contents_sz);
1469         }
1470
1471         if (commit_lock_file(lock) < 0) {
1472                 error("could not commit config file %s", config_filename);
1473                 ret = CONFIG_NO_WRITE;
1474                 goto out_free;
1475         }
1476
1477         /*
1478          * lock is committed, so don't try to roll it back below.
1479          * NOTE: Since lockfile.c keeps a linked list of all created
1480          * lock_file structures, it isn't safe to free(lock).  It's
1481          * better to just leave it hanging around.
1482          */
1483         lock = NULL;
1484         ret = 0;
1485
1486 out_free:
1487         if (lock)
1488                 rollback_lock_file(lock);
1489         return ret;
1490
1491 write_err_out:
1492         ret = write_error(lock->filename);
1493         goto out_free;
1494
1495 }
1496
1497 int git_config_set_multivar(const char *key, const char *value,
1498                         const char *value_regex, int multi_replace)
1499 {
1500         const char *config_filename;
1501         char *buf = NULL;
1502         int ret;
1503
1504         if (config_exclusive_filename)
1505                 config_filename = config_exclusive_filename;
1506         else
1507                 config_filename = buf = git_pathdup("config");
1508
1509         ret = git_config_set_multivar_in_file(config_filename, key, value,
1510                                         value_regex, multi_replace);
1511         free(buf);
1512         return ret;
1513 }
1514
1515 static int section_name_match (const char *buf, const char *name)
1516 {
1517         int i = 0, j = 0, dot = 0;
1518         if (buf[i] != '[')
1519                 return 0;
1520         for (i = 1; buf[i] && buf[i] != ']'; i++) {
1521                 if (!dot && isspace(buf[i])) {
1522                         dot = 1;
1523                         if (name[j++] != '.')
1524                                 break;
1525                         for (i++; isspace(buf[i]); i++)
1526                                 ; /* do nothing */
1527                         if (buf[i] != '"')
1528                                 break;
1529                         continue;
1530                 }
1531                 if (buf[i] == '\\' && dot)
1532                         i++;
1533                 else if (buf[i] == '"' && dot) {
1534                         for (i++; isspace(buf[i]); i++)
1535                                 ; /* do_nothing */
1536                         break;
1537                 }
1538                 if (buf[i] != name[j++])
1539                         break;
1540         }
1541         if (buf[i] == ']' && name[j] == 0) {
1542                 /*
1543                  * We match, now just find the right length offset by
1544                  * gobbling up any whitespace after it, as well
1545                  */
1546                 i++;
1547                 for (; buf[i] && isspace(buf[i]); i++)
1548                         ; /* do nothing */
1549                 return i;
1550         }
1551         return 0;
1552 }
1553
1554 /* if new_name == NULL, the section is removed instead */
1555 int git_config_rename_section(const char *old_name, const char *new_name)
1556 {
1557         int ret = 0, remove = 0;
1558         char *config_filename;
1559         struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1560         int out_fd;
1561         char buf[1024];
1562         FILE *config_file;
1563
1564         if (config_exclusive_filename)
1565                 config_filename = xstrdup(config_exclusive_filename);
1566         else
1567                 config_filename = git_pathdup("config");
1568         out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1569         if (out_fd < 0) {
1570                 ret = error("could not lock config file %s", config_filename);
1571                 goto out;
1572         }
1573
1574         if (!(config_file = fopen(config_filename, "rb"))) {
1575                 /* no config file means nothing to rename, no error */
1576                 goto unlock_and_out;
1577         }
1578
1579         while (fgets(buf, sizeof(buf), config_file)) {
1580                 int i;
1581                 int length;
1582                 char *output = buf;
1583                 for (i = 0; buf[i] && isspace(buf[i]); i++)
1584                         ; /* do nothing */
1585                 if (buf[i] == '[') {
1586                         /* it's a section */
1587                         int offset = section_name_match(&buf[i], old_name);
1588                         if (offset > 0) {
1589                                 ret++;
1590                                 if (new_name == NULL) {
1591                                         remove = 1;
1592                                         continue;
1593                                 }
1594                                 store.baselen = strlen(new_name);
1595                                 if (!store_write_section(out_fd, new_name)) {
1596                                         ret = write_error(lock->filename);
1597                                         goto out;
1598                                 }
1599                                 /*
1600                                  * We wrote out the new section, with
1601                                  * a newline, now skip the old
1602                                  * section's length
1603                                  */
1604                                 output += offset + i;
1605                                 if (strlen(output) > 0) {
1606                                         /*
1607                                          * More content means there's
1608                                          * a declaration to put on the
1609                                          * next line; indent with a
1610                                          * tab
1611                                          */
1612                                         output -= 1;
1613                                         output[0] = '\t';
1614                                 }
1615                         }
1616                         remove = 0;
1617                 }
1618                 if (remove)
1619                         continue;
1620                 length = strlen(output);
1621                 if (write_in_full(out_fd, output, length) != length) {
1622                         ret = write_error(lock->filename);
1623                         goto out;
1624                 }
1625         }
1626         fclose(config_file);
1627 unlock_and_out:
1628         if (commit_lock_file(lock) < 0)
1629                 ret = error("could not commit config file %s", config_filename);
1630 out:
1631         free(config_filename);
1632         return ret;
1633 }
1634
1635 /*
1636  * Call this to report error for your variable that should not
1637  * get a boolean value (i.e. "[my] var" means "true").
1638  */
1639 int config_error_nonbool(const char *var)
1640 {
1641         return error("Missing value for '%s'", var);
1642 }