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 typedef struct config_file {
  14         struct config_file *prev;
  15         FILE *f;
  16         const char *name;
  17         int linenr;
  18         int eof;
  19         struct strbuf value;
  20         struct strbuf var;
  21 } config_file;
  22
  23 static config_file *cf;
  24
  25 static int zlib_compression_seen;
  26
  27 #define MAX_INCLUDE_DEPTH 10
  28 static const char include_depth_advice[] =
  29 "exceeded maximum include depth (%d) while including\n"
  30 "       %s\n"
  31 "from\n"
  32 "       %s\n"
  33 "Do you have circular includes?";
  34 static int handle_path_include(const char *path, struct config_include_data *inc)
  35 {
  36         int ret = 0;
  37         struct strbuf buf = STRBUF_INIT;
  38         char *expanded = expand_user_path(path);
  39
  40         if (!expanded)
  41                 return error("Could not expand include path '%s'", path);
  42         path = expanded;
  43
  44         /*
  45          * Use an absolute path as-is, but interpret relative paths
  46          * based on the including config file.
  47          */
  48         if (!is_absolute_path(path)) {
  49                 char *slash;
  50
  51                 if (!cf || !cf->name)
  52                         return error("relative config includes must come from files");
  53
  54                 slash = find_last_dir_sep(cf->name);
  55                 if (slash)
  56                         strbuf_add(&buf, cf->name, slash - cf->name + 1);
  57                 strbuf_addstr(&buf, path);
  58                 path = buf.buf;
  59         }
  60
  61         if (!access_or_die(path, R_OK)) {
  62                 if (++inc->depth > MAX_INCLUDE_DEPTH)
  63                         die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
  64                             cf && cf->name ? cf->name : "the command line");
  65                 ret = git_config_from_file(git_config_include, path, inc);
  66                 inc->depth--;
  67         }
  68         strbuf_release(&buf);
  69         free(expanded);
  70         return ret;
  71 }
  72
  73 int git_config_include(const char *var, const char *value, void *data)
  74 {
  75         struct config_include_data *inc = data;
  76         const char *type;
  77         int ret;
  78
  79         /*
  80          * Pass along all values, including "include" directives; this makes it
  81          * possible to query information on the includes themselves.
  82          */
  83         ret = inc->fn(var, value, inc->data);
  84         if (ret < 0)
  85                 return ret;
  86
  87         type = skip_prefix(var, "include.");
  88         if (!type)
  89                 return ret;
  90
  91         if (!strcmp(type, "path"))
  92                 ret = handle_path_include(value, inc);
  93         return ret;
  94 }
  95
  96 static void lowercase(char *p)
  97 {
  98         for (; *p; p++)
  99                 *p = tolower(*p);
 100 }
 101
 102 void git_config_push_parameter(const char *text)
 103 {
 104         struct strbuf env = STRBUF_INIT;
 105         const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
 106         if (old) {
 107                 strbuf_addstr(&env, old);
 108                 strbuf_addch(&env, ' ');
 109         }
 110         sq_quote_buf(&env, text);
 111         setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
 112         strbuf_release(&env);
 113 }
 114
 115 int git_config_parse_parameter(const char *text,
 116                                config_fn_t fn, void *data)
 117 {
 118         struct strbuf **pair;
 119         pair = strbuf_split_str(text, '=', 2);
 120         if (!pair[0])
 121                 return error("bogus config parameter: %s", text);
 122         if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
 123                 strbuf_setlen(pair[0], pair[0]->len - 1);
 124         strbuf_trim(pair[0]);
 125         if (!pair[0]->len) {
 126                 strbuf_list_free(pair);
 127                 return error("bogus config parameter: %s", text);
 128         }
 129         lowercase(pair[0]->buf);
 130         if (fn(pair[0]->buf, pair[1] ? pair[1]->buf : NULL, data) < 0) {
 131                 strbuf_list_free(pair);
 132                 return -1;
 133         }
 134         strbuf_list_free(pair);
 135         return 0;
 136 }
 137
 138 int git_config_from_parameters(config_fn_t fn, void *data)
 139 {
 140         const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 141         char *envw;
 142         const char **argv = NULL;
 143         int nr = 0, alloc = 0;
 144         int i;
 145
 146         if (!env)
 147                 return 0;
 148         /* sq_dequote will write over it */
 149         envw = xstrdup(env);
 150
 151         if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 152                 free(envw);
 153                 return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
 154         }
 155
 156         for (i = 0; i < nr; i++) {
 157                 if (git_config_parse_parameter(argv[i], fn, data) < 0) {
 158                         free(argv);
 159                         free(envw);
 160                         return -1;
 161                 }
 162         }
 163
 164         free(argv);
 165         free(envw);
 166         return nr > 0;
 167 }
 168
 169 static int get_next_char(void)
 170 {
 171         int c;
 172         FILE *f = cf->f;
 173
 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         return c;
 190 }
 191
 192 static char *parse_value(void)
 193 {
 194         int quote = 0, comment = 0, space = 0;
 195
 196         strbuf_reset(&cf->value);
 197         for (;;) {
 198                 int c = get_next_char();
 199                 if (c == '\n') {
 200                         if (quote) {
 201                                 cf->linenr--;
 202                                 return NULL;
 203                         }
 204                         return cf->value.buf;
 205                 }
 206                 if (comment)
 207                         continue;
 208                 if (isspace(c) && !quote) {
 209                         if (cf->value.len)
 210                                 space++;
 211                         continue;
 212                 }
 213                 if (!quote) {
 214                         if (c == ';' || c == '#') {
 215                                 comment = 1;
 216                                 continue;
 217                         }
 218                 }
 219                 for (; space; space--)
 220                         strbuf_addch(&cf->value, ' ');
 221                 if (c == '\\') {
 222                         c = get_next_char();
 223                         switch (c) {
 224                         case '\n':
 225                                 continue;
 226                         case 't':
 227                                 c = '\t';
 228                                 break;
 229                         case 'b':
 230                                 c = '\b';
 231                                 break;
 232                         case 'n':
 233                                 c = '\n';
 234                                 break;
 235                         /* Some characters escape as themselves */
 236                         case '\\': case '"':
 237                                 break;
 238                         /* Reject unknown escape sequences */
 239                         default:
 240                                 return NULL;
 241                         }
 242                         strbuf_addch(&cf->value, c);
 243                         continue;
 244                 }
 245                 if (c == '"') {
 246                         quote = 1-quote;
 247                         continue;
 248                 }
 249                 strbuf_addch(&cf->value, c);
 250         }
 251 }
 252
 253 static inline int iskeychar(int c)
 254 {
 255         return isalnum(c) || c == '-';
 256 }
 257
 258 static int get_value(config_fn_t fn, void *data, struct strbuf *name)
 259 {
 260         int c;
 261         char *value;
 262
 263         /* Get the full name */
 264         for (;;) {
 265                 c = get_next_char();
 266                 if (cf->eof)
 267                         break;
 268                 if (!iskeychar(c))
 269                         break;
 270                 strbuf_addch(name, tolower(c));
 271         }
 272
 273         while (c == ' ' || c == '\t')
 274                 c = get_next_char();
 275
 276         value = NULL;
 277         if (c != '\n') {
 278                 if (c != '=')
 279                         return -1;
 280                 value = parse_value();
 281                 if (!value)
 282                         return -1;
 283         }
 284         return fn(name->buf, value, data);
 285 }
 286
 287 static int get_extended_base_var(struct strbuf *name, int c)
 288 {
 289         do {
 290                 if (c == '\n')
 291                         goto error_incomplete_line;
 292                 c = get_next_char();
 293         } while (isspace(c));
 294
 295         /* We require the format to be '[base "extension"]' */
 296         if (c != '"')
 297                 return -1;
 298         strbuf_addch(name, '.');
 299
 300         for (;;) {
 301                 int c = get_next_char();
 302                 if (c == '\n')
 303                         goto error_incomplete_line;
 304                 if (c == '"')
 305                         break;
 306                 if (c == '\\') {
 307                         c = get_next_char();
 308                         if (c == '\n')
 309                                 goto error_incomplete_line;
 310                 }
 311                 strbuf_addch(name, c);
 312         }
 313
 314         /* Final ']' */
 315         if (get_next_char() != ']')
 316                 return -1;
 317         return 0;
 318 error_incomplete_line:
 319         cf->linenr--;
 320         return -1;
 321 }
 322
 323 static int get_base_var(struct strbuf *name)
 324 {
 325         for (;;) {
 326                 int c = get_next_char();
 327                 if (cf->eof)
 328                         return -1;
 329                 if (c == ']')
 330                         return 0;
 331                 if (isspace(c))
 332                         return get_extended_base_var(name, c);
 333                 if (!iskeychar(c) && c != '.')
 334                         return -1;
 335                 strbuf_addch(name, tolower(c));
 336         }
 337 }
 338
 339 static int git_parse_file(config_fn_t fn, void *data)
 340 {
 341         int comment = 0;
 342         int baselen = 0;
 343         struct strbuf *var = &cf->var;
 344
 345         /* U+FEFF Byte Order Mark in UTF8 */
 346         static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 347         const unsigned char *bomptr = utf8_bom;
 348
 349         for (;;) {
 350                 int c = get_next_char();
 351                 if (bomptr && *bomptr) {
 352                         /* We are at the file beginning; skip UTF8-encoded BOM
 353                          * if present. Sane editors won't put this in on their
 354                          * own, but e.g. Windows Notepad will do it happily. */
 355                         if ((unsigned char) c == *bomptr) {
 356                                 bomptr++;
 357                                 continue;
 358                         } else {
 359                                 /* Do not tolerate partial BOM. */
 360                                 if (bomptr != utf8_bom)
 361                                         break;
 362                                 /* No BOM at file beginning. Cool. */
 363                                 bomptr = NULL;
 364                         }
 365                 }
 366                 if (c == '\n') {
 367                         if (cf->eof)
 368                                 return 0;
 369                         comment = 0;
 370                         continue;
 371                 }
 372                 if (comment || isspace(c))
 373                         continue;
 374                 if (c == '#' || c == ';') {
 375                         comment = 1;
 376                         continue;
 377                 }
 378                 if (c == '[') {
 379                         /* Reset prior to determining a new stem */
 380                         strbuf_reset(var);
 381                         if (get_base_var(var) < 0 || var->len < 1)
 382                                 break;
 383                         strbuf_addch(var, '.');
 384                         baselen = var->len;
 385                         continue;
 386                 }
 387                 if (!isalpha(c))
 388                         break;
 389                 /*
 390                  * Truncate the var name back to the section header
 391                  * stem prior to grabbing the suffix part of the name
 392                  * and the value.
 393                  */
 394                 strbuf_setlen(var, baselen);
 395                 strbuf_addch(var, tolower(c));
 396                 if (get_value(fn, data, var) < 0)
 397                         break;
 398         }
 399         die("bad config file line %d in %s", cf->linenr, cf->name);
 400 }
 401
 402 static int parse_unit_factor(const char *end, uintmax_t *val)
 403 {
 404         if (!*end)
 405                 return 1;
 406         else if (!strcasecmp(end, "k")) {
 407                 *val *= 1024;
 408                 return 1;
 409         }
 410         else if (!strcasecmp(end, "m")) {
 411                 *val *= 1024 * 1024;
 412                 return 1;
 413         }
 414         else if (!strcasecmp(end, "g")) {
 415                 *val *= 1024 * 1024 * 1024;
 416                 return 1;
 417         }
 418         return 0;
 419 }
 420
 421 static int git_parse_long(const char *value, long *ret)
 422 {
 423         if (value && *value) {
 424                 char *end;
 425                 intmax_t val;
 426                 uintmax_t uval;
 427                 uintmax_t factor = 1;
 428
 429                 errno = 0;
 430                 val = strtoimax(value, &end, 0);
 431                 if (errno == ERANGE)
 432                         return 0;
 433                 if (!parse_unit_factor(end, &factor))
 434                         return 0;
 435                 uval = abs(val);
 436                 uval *= factor;
 437                 if ((uval > maximum_signed_value_of_type(long)) ||
 438                     (abs(val) > uval))
 439                         return 0;
 440                 val *= factor;
 441                 *ret = val;
 442                 return 1;
 443         }
 444         return 0;
 445 }
 446
 447 int git_parse_ulong(const char *value, unsigned long *ret)
 448 {
 449         if (value && *value) {
 450                 char *end;
 451                 uintmax_t val;
 452                 uintmax_t oldval;
 453
 454                 errno = 0;
 455                 val = strtoumax(value, &end, 0);
 456                 if (errno == ERANGE)
 457                         return 0;
 458                 oldval = val;
 459                 if (!parse_unit_factor(end, &val))
 460                         return 0;
 461                 if ((val > maximum_unsigned_value_of_type(long)) ||
 462                     (oldval > val))
 463                         return 0;
 464                 *ret = val;
 465                 return 1;
 466         }
 467         return 0;
 468 }
 469
 470 static void die_bad_config(const char *name)
 471 {
 472         if (cf && cf->name)
 473                 die("bad config value for '%s' in %s", name, cf->name);
 474         die("bad config value for '%s'", name);
 475 }
 476
 477 int git_config_int(const char *name, const char *value)
 478 {
 479         long ret = 0;
 480         if (!git_parse_long(value, &ret))
 481                 die_bad_config(name);
 482         return ret;
 483 }
 484
 485 unsigned long git_config_ulong(const char *name, const char *value)
 486 {
 487         unsigned long ret;
 488         if (!git_parse_ulong(value, &ret))
 489                 die_bad_config(name);
 490         return ret;
 491 }
 492
 493 static int git_config_maybe_bool_text(const char *name, const char *value)
 494 {
 495         if (!value)
 496                 return 1;
 497         if (!*value)
 498                 return 0;
 499         if (!strcasecmp(value, "true")
 500             || !strcasecmp(value, "yes")
 501             || !strcasecmp(value, "on"))
 502                 return 1;
 503         if (!strcasecmp(value, "false")
 504             || !strcasecmp(value, "no")
 505             || !strcasecmp(value, "off"))
 506                 return 0;
 507         return -1;
 508 }
 509
 510 int git_config_maybe_bool(const char *name, const char *value)
 511 {
 512         long v = git_config_maybe_bool_text(name, value);
 513         if (0 <= v)
 514                 return v;
 515         if (git_parse_long(value, &v))
 516                 return !!v;
 517         return -1;
 518 }
 519
 520 int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 521 {
 522         int v = git_config_maybe_bool_text(name, value);
 523         if (0 <= v) {
 524                 *is_bool = 1;
 525                 return v;
 526         }
 527         *is_bool = 0;
 528         return git_config_int(name, value);
 529 }
 530
 531 int git_config_bool(const char *name, const char *value)
 532 {
 533         int discard;
 534         return !!git_config_bool_or_int(name, value, &discard);
 535 }
 536
 537 int git_config_string(const char **dest, const char *var, const char *value)
 538 {
 539         if (!value)
 540                 return config_error_nonbool(var);
 541         *dest = xstrdup(value);
 542         return 0;
 543 }
 544
 545 int git_config_pathname(const char **dest, const char *var, const char *value)
 546 {
 547         if (!value)
 548                 return config_error_nonbool(var);
 549         *dest = expand_user_path(value);
 550         if (!*dest)
 551                 die("Failed to expand user dir in: '%s'", value);
 552         return 0;
 553 }
 554
 555 static int git_default_core_config(const char *var, const char *value)
 556 {
 557         /* This needs a better name */
 558         if (!strcmp(var, "core.filemode")) {
 559                 trust_executable_bit = git_config_bool(var, value);
 560                 return 0;
 561         }
 562         if (!strcmp(var, "core.trustctime")) {
 563                 trust_ctime = git_config_bool(var, value);
 564                 return 0;
 565         }
 566         if (!strcmp(var, "core.statinfo")) {
 567                 if (!strcasecmp(value, "default"))
 568                         check_stat = 1;
 569                 else if (!strcasecmp(value, "minimal"))
 570                         check_stat = 0;
 571         }
 572
 573         if (!strcmp(var, "core.quotepath")) {
 574                 quote_path_fully = git_config_bool(var, value);
 575                 return 0;
 576         }
 577
 578         if (!strcmp(var, "core.symlinks")) {
 579                 has_symlinks = git_config_bool(var, value);
 580                 return 0;
 581         }
 582
 583         if (!strcmp(var, "core.ignorecase")) {
 584                 ignore_case = git_config_bool(var, value);
 585                 return 0;
 586         }
 587
 588         if (!strcmp(var, "core.attributesfile"))
 589                 return git_config_pathname(&git_attributes_file, var, value);
 590
 591         if (!strcmp(var, "core.bare")) {
 592                 is_bare_repository_cfg = git_config_bool(var, value);
 593                 return 0;
 594         }
 595
 596         if (!strcmp(var, "core.ignorestat")) {
 597                 assume_unchanged = git_config_bool(var, value);
 598                 return 0;
 599         }
 600
 601         if (!strcmp(var, "core.prefersymlinkrefs")) {
 602                 prefer_symlink_refs = git_config_bool(var, value);
 603                 return 0;
 604         }
 605
 606         if (!strcmp(var, "core.logallrefupdates")) {
 607                 log_all_ref_updates = git_config_bool(var, value);
 608                 return 0;
 609         }
 610
 611         if (!strcmp(var, "core.warnambiguousrefs")) {
 612                 warn_ambiguous_refs = git_config_bool(var, value);
 613                 return 0;
 614         }
 615
 616         if (!strcmp(var, "core.abbrev")) {
 617                 int abbrev = git_config_int(var, value);
 618                 if (abbrev < minimum_abbrev || abbrev > 40)
 619                         return -1;
 620                 default_abbrev = abbrev;
 621                 return 0;
 622         }
 623
 624         if (!strcmp(var, "core.loosecompression")) {
 625                 int level = git_config_int(var, value);
 626                 if (level == -1)
 627                         level = Z_DEFAULT_COMPRESSION;
 628                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 629                         die("bad zlib compression level %d", level);
 630                 zlib_compression_level = level;
 631                 zlib_compression_seen = 1;
 632                 return 0;
 633         }
 634
 635         if (!strcmp(var, "core.compression")) {
 636                 int level = git_config_int(var, value);
 637                 if (level == -1)
 638                         level = Z_DEFAULT_COMPRESSION;
 639                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 640                         die("bad zlib compression level %d", level);
 641                 core_compression_level = level;
 642                 core_compression_seen = 1;
 643                 if (!zlib_compression_seen)
 644                         zlib_compression_level = level;
 645                 return 0;
 646         }
 647
 648         if (!strcmp(var, "core.packedgitwindowsize")) {
 649                 int pgsz_x2 = getpagesize() * 2;
 650                 packed_git_window_size = git_config_ulong(var, value);
 651
 652                 /* This value must be multiple of (pagesize * 2) */
 653                 packed_git_window_size /= pgsz_x2;
 654                 if (packed_git_window_size < 1)
 655                         packed_git_window_size = 1;
 656                 packed_git_window_size *= pgsz_x2;
 657                 return 0;
 658         }
 659
 660         if (!strcmp(var, "core.bigfilethreshold")) {
 661                 big_file_threshold = git_config_ulong(var, value);
 662                 return 0;
 663         }
 664
 665         if (!strcmp(var, "core.packedgitlimit")) {
 666                 packed_git_limit = git_config_ulong(var, value);
 667                 return 0;
 668         }
 669
 670         if (!strcmp(var, "core.deltabasecachelimit")) {
 671                 delta_base_cache_limit = git_config_ulong(var, value);
 672                 return 0;
 673         }
 674
 675         if (!strcmp(var, "core.logpackaccess"))
 676                 return git_config_string(&log_pack_access, var, value);
 677
 678         if (!strcmp(var, "core.autocrlf")) {
 679                 if (value && !strcasecmp(value, "input")) {
 680                         if (core_eol == EOL_CRLF)
 681                                 return error("core.autocrlf=input conflicts with core.eol=crlf");
 682                         auto_crlf = AUTO_CRLF_INPUT;
 683                         return 0;
 684                 }
 685                 auto_crlf = git_config_bool(var, value);
 686                 return 0;
 687         }
 688
 689         if (!strcmp(var, "core.safecrlf")) {
 690                 if (value && !strcasecmp(value, "warn")) {
 691                         safe_crlf = SAFE_CRLF_WARN;
 692                         return 0;
 693                 }
 694                 safe_crlf = git_config_bool(var, value);
 695                 return 0;
 696         }
 697
 698         if (!strcmp(var, "core.eol")) {
 699                 if (value && !strcasecmp(value, "lf"))
 700                         core_eol = EOL_LF;
 701                 else if (value && !strcasecmp(value, "crlf"))
 702                         core_eol = EOL_CRLF;
 703                 else if (value && !strcasecmp(value, "native"))
 704                         core_eol = EOL_NATIVE;
 705                 else
 706                         core_eol = EOL_UNSET;
 707                 if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 708                         return error("core.autocrlf=input conflicts with core.eol=crlf");
 709                 return 0;
 710         }
 711
 712         if (!strcmp(var, "core.notesref")) {
 713                 notes_ref_name = xstrdup(value);
 714                 return 0;
 715         }
 716
 717         if (!strcmp(var, "core.pager"))
 718                 return git_config_string(&pager_program, var, value);
 719
 720         if (!strcmp(var, "core.editor"))
 721                 return git_config_string(&editor_program, var, value);
 722
 723         if (!strcmp(var, "core.commentchar")) {
 724                 const char *comment;
 725                 int ret = git_config_string(&comment, var, value);
 726                 if (!ret)
 727                         comment_line_char = comment[0];
 728                 return ret;
 729         }
 730
 731         if (!strcmp(var, "core.askpass"))
 732                 return git_config_string(&askpass_program, var, value);
 733
 734         if (!strcmp(var, "core.excludesfile"))
 735                 return git_config_pathname(&excludes_file, var, value);
 736
 737         if (!strcmp(var, "core.whitespace")) {
 738                 if (!value)
 739                         return config_error_nonbool(var);
 740                 whitespace_rule_cfg = parse_whitespace_rule(value);
 741                 return 0;
 742         }
 743
 744         if (!strcmp(var, "core.fsyncobjectfiles")) {
 745                 fsync_object_files = git_config_bool(var, value);
 746                 return 0;
 747         }
 748
 749         if (!strcmp(var, "core.preloadindex")) {
 750                 core_preload_index = git_config_bool(var, value);
 751                 return 0;
 752         }
 753
 754         if (!strcmp(var, "core.createobject")) {
 755                 if (!strcmp(value, "rename"))
 756                         object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 757                 else if (!strcmp(value, "link"))
 758                         object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 759                 else
 760                         die("Invalid mode for object creation: %s", value);
 761                 return 0;
 762         }
 763
 764         if (!strcmp(var, "core.sparsecheckout")) {
 765                 core_apply_sparse_checkout = git_config_bool(var, value);
 766                 return 0;
 767         }
 768
 769         if (!strcmp(var, "core.precomposeunicode")) {
 770                 precomposed_unicode = git_config_bool(var, value);
 771                 return 0;
 772         }
 773
 774         /* Add other config variables here and to Documentation/config.txt. */
 775         return 0;
 776 }
 777
 778 static int git_default_i18n_config(const char *var, const char *value)
 779 {
 780         if (!strcmp(var, "i18n.commitencoding"))
 781                 return git_config_string(&git_commit_encoding, var, value);
 782
 783         if (!strcmp(var, "i18n.logoutputencoding"))
 784                 return git_config_string(&git_log_output_encoding, var, value);
 785
 786         /* Add other config variables here and to Documentation/config.txt. */
 787         return 0;
 788 }
 789
 790 static int git_default_branch_config(const char *var, const char *value)
 791 {
 792         if (!strcmp(var, "branch.autosetupmerge")) {
 793                 if (value && !strcasecmp(value, "always")) {
 794                         git_branch_track = BRANCH_TRACK_ALWAYS;
 795                         return 0;
 796                 }
 797                 git_branch_track = git_config_bool(var, value);
 798                 return 0;
 799         }
 800         if (!strcmp(var, "branch.autosetuprebase")) {
 801                 if (!value)
 802                         return config_error_nonbool(var);
 803                 else if (!strcmp(value, "never"))
 804                         autorebase = AUTOREBASE_NEVER;
 805                 else if (!strcmp(value, "local"))
 806                         autorebase = AUTOREBASE_LOCAL;
 807                 else if (!strcmp(value, "remote"))
 808                         autorebase = AUTOREBASE_REMOTE;
 809                 else if (!strcmp(value, "always"))
 810                         autorebase = AUTOREBASE_ALWAYS;
 811                 else
 812                         return error("Malformed value for %s", var);
 813                 return 0;
 814         }
 815
 816         /* Add other config variables here and to Documentation/config.txt. */
 817         return 0;
 818 }
 819
 820 static int git_default_push_config(const char *var, const char *value)
 821 {
 822         if (!strcmp(var, "push.default")) {
 823                 if (!value)
 824                         return config_error_nonbool(var);
 825                 else if (!strcmp(value, "nothing"))
 826                         push_default = PUSH_DEFAULT_NOTHING;
 827                 else if (!strcmp(value, "matching"))
 828                         push_default = PUSH_DEFAULT_MATCHING;
 829                 else if (!strcmp(value, "simple"))
 830                         push_default = PUSH_DEFAULT_SIMPLE;
 831                 else if (!strcmp(value, "upstream"))
 832                         push_default = PUSH_DEFAULT_UPSTREAM;
 833                 else if (!strcmp(value, "tracking")) /* deprecated */
 834                         push_default = PUSH_DEFAULT_UPSTREAM;
 835                 else if (!strcmp(value, "current"))
 836                         push_default = PUSH_DEFAULT_CURRENT;
 837                 else {
 838                         error("Malformed value for %s: %s", var, value);
 839                         return error("Must be one of nothing, matching, simple, "
 840                                      "upstream or current.");
 841                 }
 842                 return 0;
 843         }
 844
 845         /* Add other config variables here and to Documentation/config.txt. */
 846         return 0;
 847 }
 848
 849 static int git_default_mailmap_config(const char *var, const char *value)
 850 {
 851         if (!strcmp(var, "mailmap.file"))
 852                 return git_config_string(&git_mailmap_file, var, value);
 853         if (!strcmp(var, "mailmap.blob"))
 854                 return git_config_string(&git_mailmap_blob, var, value);
 855
 856         /* Add other config variables here and to Documentation/config.txt. */
 857         return 0;
 858 }
 859
 860 int git_default_config(const char *var, const char *value, void *dummy)
 861 {
 862         if (!prefixcmp(var, "core."))
 863                 return git_default_core_config(var, value);
 864
 865         if (!prefixcmp(var, "user."))
 866                 return git_ident_config(var, value, dummy);
 867
 868         if (!prefixcmp(var, "i18n."))
 869                 return git_default_i18n_config(var, value);
 870
 871         if (!prefixcmp(var, "branch."))
 872                 return git_default_branch_config(var, value);
 873
 874         if (!prefixcmp(var, "push."))
 875                 return git_default_push_config(var, value);
 876
 877         if (!prefixcmp(var, "mailmap."))
 878                 return git_default_mailmap_config(var, value);
 879
 880         if (!prefixcmp(var, "advice."))
 881                 return git_default_advice_config(var, value);
 882
 883         if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 884                 pager_use_color = git_config_bool(var,value);
 885                 return 0;
 886         }
 887
 888         if (!strcmp(var, "pack.packsizelimit")) {
 889                 pack_size_limit_cfg = git_config_ulong(var, value);
 890                 return 0;
 891         }
 892         /* Add other config variables here and to Documentation/config.txt. */
 893         return 0;
 894 }
 895
 896 /*
 897  * The fields f and name of top need to be initialized before calling
 898  * this function.
 899  */
 900 static int do_config_from(struct config_file *top, config_fn_t fn, void *data)
 901 {
 902         int ret;
 903
 904         /* push config-file parsing state stack */
 905         top->prev = cf;
 906         top->linenr = 1;
 907         top->eof = 0;
 908         strbuf_init(&top->value, 1024);
 909         strbuf_init(&top->var, 1024);
 910         cf = top;
 911
 912         ret = git_parse_file(fn, data);
 913
 914         /* pop config-file parsing state stack */
 915         strbuf_release(&top->value);
 916         strbuf_release(&top->var);
 917         cf = top->prev;
 918
 919         return ret;
 920 }
 921
 922 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 923 {
 924         int ret;
 925         FILE *f = fopen(filename, "r");
 926
 927         ret = -1;
 928         if (f) {
 929                 config_file top;
 930
 931                 top.f = f;
 932                 top.name = filename;
 933
 934                 ret = do_config_from(&top, fn, data);
 935
 936                 fclose(f);
 937         }
 938         return ret;
 939 }
 940
 941 const char *git_etc_gitconfig(void)
 942 {
 943         static const char *system_wide;
 944         if (!system_wide)
 945                 system_wide = system_path(ETC_GITCONFIG);
 946         return system_wide;
 947 }
 948
 949 int git_env_bool(const char *k, int def)
 950 {
 951         const char *v = getenv(k);
 952         return v ? git_config_bool(k, v) : def;
 953 }
 954
 955 int git_config_system(void)
 956 {
 957         return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 958 }
 959
 960 int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 961 {
 962         int ret = 0, found = 0;
 963         char *xdg_config = NULL;
 964         char *user_config = NULL;
 965
 966         home_config_paths(&user_config, &xdg_config, "config");
 967
 968         if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK)) {
 969                 ret += git_config_from_file(fn, git_etc_gitconfig(),
 970                                             data);
 971                 found += 1;
 972         }
 973
 974         if (xdg_config && !access_or_die(xdg_config, R_OK)) {
 975                 ret += git_config_from_file(fn, xdg_config, data);
 976                 found += 1;
 977         }
 978
 979         if (user_config && !access_or_die(user_config, R_OK)) {
 980                 ret += git_config_from_file(fn, user_config, data);
 981                 found += 1;
 982         }
 983
 984         if (repo_config && !access_or_die(repo_config, R_OK)) {
 985                 ret += git_config_from_file(fn, repo_config, data);
 986                 found += 1;
 987         }
 988
 989         switch (git_config_from_parameters(fn, data)) {
 990         case -1: /* error */
 991                 die("unable to parse command-line config");
 992                 break;
 993         case 0: /* found nothing */
 994                 break;
 995         default: /* found at least one item */
 996                 found++;
 997                 break;
 998         }
 999
1000         free(xdg_config);
1001         free(user_config);
1002         return ret == 0 ? found : ret;
1003 }
1004
1005 int git_config_with_options(config_fn_t fn, void *data,
1006                             const char *filename, int respect_includes)
1007 {
1008         char *repo_config = NULL;
1009         int ret;
1010         struct config_include_data inc = CONFIG_INCLUDE_INIT;
1011
1012         if (respect_includes) {
1013                 inc.fn = fn;
1014                 inc.data = data;
1015                 fn = git_config_include;
1016                 data = &inc;
1017         }
1018
1019         /*
1020          * If we have a specific filename, use it. Otherwise, follow the
1021          * regular lookup sequence.
1022          */
1023         if (filename)
1024                 return git_config_from_file(fn, filename, data);
1025
1026         repo_config = git_pathdup("config");
1027         ret = git_config_early(fn, data, repo_config);
1028         if (repo_config)
1029                 free(repo_config);
1030         return ret;
1031 }
1032
1033 int git_config(config_fn_t fn, void *data)
1034 {
1035         return git_config_with_options(fn, data, NULL, 1);
1036 }
1037
1038 /*
1039  * Find all the stuff for git_config_set() below.
1040  */
1041
1042 #define MAX_MATCHES 512
1043
1044 static struct {
1045         int baselen;
1046         char *key;
1047         int do_not_match;
1048         regex_t *value_regex;
1049         int multi_replace;
1050         size_t offset[MAX_MATCHES];
1051         enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1052         int seen;
1053 } store;
1054
1055 static int matches(const char *key, const char *value)
1056 {
1057         return !strcmp(key, store.key) &&
1058                 (store.value_regex == NULL ||
1059                  (store.do_not_match ^
1060                   !regexec(store.value_regex, value, 0, NULL, 0)));
1061 }
1062
1063 static int store_aux(const char *key, const char *value, void *cb)
1064 {
1065         const char *ep;
1066         size_t section_len;
1067         FILE *f = cf->f;
1068
1069         switch (store.state) {
1070         case KEY_SEEN:
1071                 if (matches(key, value)) {
1072                         if (store.seen == 1 && store.multi_replace == 0) {
1073                                 warning("%s has multiple values", key);
1074                         } else if (store.seen >= MAX_MATCHES) {
1075                                 error("too many matches for %s", key);
1076                                 return 1;
1077                         }
1078
1079                         store.offset[store.seen] = ftell(f);
1080                         store.seen++;
1081                 }
1082                 break;
1083         case SECTION_SEEN:
1084                 /*
1085                  * What we are looking for is in store.key (both
1086                  * section and var), and its section part is baselen
1087                  * long.  We found key (again, both section and var).
1088                  * We would want to know if this key is in the same
1089                  * section as what we are looking for.  We already
1090                  * know we are in the same section as what should
1091                  * hold store.key.
1092                  */
1093                 ep = strrchr(key, '.');
1094                 section_len = ep - key;
1095
1096                 if ((section_len != store.baselen) ||
1097                     memcmp(key, store.key, section_len+1)) {
1098                         store.state = SECTION_END_SEEN;
1099                         break;
1100                 }
1101
1102                 /*
1103                  * Do not increment matches: this is no match, but we
1104                  * just made sure we are in the desired section.
1105                  */
1106                 store.offset[store.seen] = ftell(f);
1107                 /* fallthru */
1108         case SECTION_END_SEEN:
1109         case START:
1110                 if (matches(key, value)) {
1111                         store.offset[store.seen] = ftell(f);
1112                         store.state = KEY_SEEN;
1113                         store.seen++;
1114                 } else {
1115                         if (strrchr(key, '.') - key == store.baselen &&
1116                               !strncmp(key, store.key, store.baselen)) {
1117                                         store.state = SECTION_SEEN;
1118                                         store.offset[store.seen] = ftell(f);
1119                         }
1120                 }
1121         }
1122         return 0;
1123 }
1124
1125 static int write_error(const char *filename)
1126 {
1127         error("failed to write new configuration file %s", filename);
1128
1129         /* Same error code as "failed to rename". */
1130         return 4;
1131 }
1132
1133 static int store_write_section(int fd, const char *key)
1134 {
1135         const char *dot;
1136         int i, success;
1137         struct strbuf sb = STRBUF_INIT;
1138
1139         dot = memchr(key, '.', store.baselen);
1140         if (dot) {
1141                 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1142                 for (i = dot - key + 1; i < store.baselen; i++) {
1143                         if (key[i] == '"' || key[i] == '\\')
1144                                 strbuf_addch(&sb, '\\');
1145                         strbuf_addch(&sb, key[i]);
1146                 }
1147                 strbuf_addstr(&sb, "\"]\n");
1148         } else {
1149                 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1150         }
1151
1152         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1153         strbuf_release(&sb);
1154
1155         return success;
1156 }
1157
1158 static int store_write_pair(int fd, const char *key, const char *value)
1159 {
1160         int i, success;
1161         int length = strlen(key + store.baselen + 1);
1162         const char *quote = "";
1163         struct strbuf sb = STRBUF_INIT;
1164
1165         /*
1166          * Check to see if the value needs to be surrounded with a dq pair.
1167          * Note that problematic characters are always backslash-quoted; this
1168          * check is about not losing leading or trailing SP and strings that
1169          * follow beginning-of-comment characters (i.e. ';' and '#') by the
1170          * configuration parser.
1171          */
1172         if (value[0] == ' ')
1173                 quote = "\"";
1174         for (i = 0; value[i]; i++)
1175                 if (value[i] == ';' || value[i] == '#')
1176                         quote = "\"";
1177         if (i && value[i - 1] == ' ')
1178                 quote = "\"";
1179
1180         strbuf_addf(&sb, "\t%.*s = %s",
1181                     length, key + store.baselen + 1, quote);
1182
1183         for (i = 0; value[i]; i++)
1184                 switch (value[i]) {
1185                 case '\n':
1186                         strbuf_addstr(&sb, "\\n");
1187                         break;
1188                 case '\t':
1189                         strbuf_addstr(&sb, "\\t");
1190                         break;
1191                 case '"':
1192                 case '\\':
1193                         strbuf_addch(&sb, '\\');
1194                 default:
1195                         strbuf_addch(&sb, value[i]);
1196                         break;
1197                 }
1198         strbuf_addf(&sb, "%s\n", quote);
1199
1200         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1201         strbuf_release(&sb);
1202
1203         return success;
1204 }
1205
1206 static ssize_t find_beginning_of_line(const char *contents, size_t size,
1207         size_t offset_, int *found_bracket)
1208 {
1209         size_t equal_offset = size, bracket_offset = size;
1210         ssize_t offset;
1211
1212 contline:
1213         for (offset = offset_-2; offset > 0
1214                         && contents[offset] != '\n'; offset--)
1215                 switch (contents[offset]) {
1216                         case '=': equal_offset = offset; break;
1217                         case ']': bracket_offset = offset; break;
1218                 }
1219         if (offset > 0 && contents[offset-1] == '\\') {
1220                 offset_ = offset;
1221                 goto contline;
1222         }
1223         if (bracket_offset < equal_offset) {
1224                 *found_bracket = 1;
1225                 offset = bracket_offset+1;
1226         } else
1227                 offset++;
1228
1229         return offset;
1230 }
1231
1232 int git_config_set_in_file(const char *config_filename,
1233                         const char *key, const char *value)
1234 {
1235         return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1236 }
1237
1238 int git_config_set(const char *key, const char *value)
1239 {
1240         return git_config_set_multivar(key, value, NULL, 0);
1241 }
1242
1243 /*
1244  * Auxiliary function to sanity-check and split the key into the section
1245  * identifier and variable name.
1246  *
1247  * Returns 0 on success, -1 when there is an invalid character in the key and
1248  * -2 if there is no section name in the key.
1249  *
1250  * store_key - pointer to char* which will hold a copy of the key with
1251  *             lowercase section and variable name
1252  * baselen - pointer to int which will hold the length of the
1253  *           section + subsection part, can be NULL
1254  */
1255 int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1256 {
1257         int i, dot, baselen;
1258         const char *last_dot = strrchr(key, '.');
1259
1260         /*
1261          * Since "key" actually contains the section name and the real
1262          * key name separated by a dot, we have to know where the dot is.
1263          */
1264
1265         if (last_dot == NULL || last_dot == key) {
1266                 error("key does not contain a section: %s", key);
1267                 return -CONFIG_NO_SECTION_OR_NAME;
1268         }
1269
1270         if (!last_dot[1]) {
1271                 error("key does not contain variable name: %s", key);
1272                 return -CONFIG_NO_SECTION_OR_NAME;
1273         }
1274
1275         baselen = last_dot - key;
1276         if (baselen_)
1277                 *baselen_ = baselen;
1278
1279         /*
1280          * Validate the key and while at it, lower case it for matching.
1281          */
1282         *store_key = xmalloc(strlen(key) + 1);
1283
1284         dot = 0;
1285         for (i = 0; key[i]; i++) {
1286                 unsigned char c = key[i];
1287                 if (c == '.')
1288                         dot = 1;
1289                 /* Leave the extended basename untouched.. */
1290                 if (!dot || i > baselen) {
1291                         if (!iskeychar(c) ||
1292                             (i == baselen + 1 && !isalpha(c))) {
1293                                 error("invalid key: %s", key);
1294                                 goto out_free_ret_1;
1295                         }
1296                         c = tolower(c);
1297                 } else if (c == '\n') {
1298                         error("invalid key (newline): %s", key);
1299                         goto out_free_ret_1;
1300                 }
1301                 (*store_key)[i] = c;
1302         }
1303         (*store_key)[i] = 0;
1304
1305         return 0;
1306
1307 out_free_ret_1:
1308         free(*store_key);
1309         *store_key = NULL;
1310         return -CONFIG_INVALID_KEY;
1311 }
1312
1313 /*
1314  * If value==NULL, unset in (remove from) config,
1315  * if value_regex!=NULL, disregard key/value pairs where value does not match.
1316  * if multi_replace==0, nothing, or only one matching key/value is replaced,
1317  *     else all matching key/values (regardless how many) are removed,
1318  *     before the new pair is written.
1319  *
1320  * Returns 0 on success.
1321  *
1322  * This function does this:
1323  *
1324  * - it locks the config file by creating ".git/config.lock"
1325  *
1326  * - it then parses the config using store_aux() as validator to find
1327  *   the position on the key/value pair to replace. If it is to be unset,
1328  *   it must be found exactly once.
1329  *
1330  * - the config file is mmap()ed and the part before the match (if any) is
1331  *   written to the lock file, then the changed part and the rest.
1332  *
1333  * - the config file is removed and the lock file rename()d to it.
1334  *
1335  */
1336 int git_config_set_multivar_in_file(const char *config_filename,
1337                                 const char *key, const char *value,
1338                                 const char *value_regex, int multi_replace)
1339 {
1340         int fd = -1, in_fd;
1341         int ret;
1342         struct lock_file *lock = NULL;
1343         char *filename_buf = NULL;
1344
1345         /* parse-key returns negative; flip the sign to feed exit(3) */
1346         ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1347         if (ret)
1348                 goto out_free;
1349
1350         store.multi_replace = multi_replace;
1351
1352         if (!config_filename)
1353                 config_filename = filename_buf = git_pathdup("config");
1354
1355         /*
1356          * The lock serves a purpose in addition to locking: the new
1357          * contents of .git/config will be written into it.
1358          */
1359         lock = xcalloc(sizeof(struct lock_file), 1);
1360         fd = hold_lock_file_for_update(lock, config_filename, 0);
1361         if (fd < 0) {
1362                 error("could not lock config file %s: %s", config_filename, strerror(errno));
1363                 free(store.key);
1364                 ret = CONFIG_NO_LOCK;
1365                 goto out_free;
1366         }
1367
1368         /*
1369          * If .git/config does not exist yet, write a minimal version.
1370          */
1371         in_fd = open(config_filename, O_RDONLY);
1372         if ( in_fd < 0 ) {
1373                 free(store.key);
1374
1375                 if ( ENOENT != errno ) {
1376                         error("opening %s: %s", config_filename,
1377                               strerror(errno));
1378                         ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1379                         goto out_free;
1380                 }
1381                 /* if nothing to unset, error out */
1382                 if (value == NULL) {
1383                         ret = CONFIG_NOTHING_SET;
1384                         goto out_free;
1385                 }
1386
1387                 store.key = (char *)key;
1388                 if (!store_write_section(fd, key) ||
1389                     !store_write_pair(fd, key, value))
1390                         goto write_err_out;
1391         } else {
1392                 struct stat st;
1393                 char *contents;
1394                 size_t contents_sz, copy_begin, copy_end;
1395                 int i, new_line = 0;
1396
1397                 if (value_regex == NULL)
1398                         store.value_regex = NULL;
1399                 else {
1400                         if (value_regex[0] == '!') {
1401                                 store.do_not_match = 1;
1402                                 value_regex++;
1403                         } else
1404                                 store.do_not_match = 0;
1405
1406                         store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1407                         if (regcomp(store.value_regex, value_regex,
1408                                         REG_EXTENDED)) {
1409                                 error("invalid pattern: %s", value_regex);
1410                                 free(store.value_regex);
1411                                 ret = CONFIG_INVALID_PATTERN;
1412                                 goto out_free;
1413                         }
1414                 }
1415
1416                 store.offset[0] = 0;
1417                 store.state = START;
1418                 store.seen = 0;
1419
1420                 /*
1421                  * After this, store.offset will contain the *end* offset
1422                  * of the last match, or remain at 0 if no match was found.
1423                  * As a side effect, we make sure to transform only a valid
1424                  * existing config file.
1425                  */
1426                 if (git_config_from_file(store_aux, config_filename, NULL)) {
1427                         error("invalid config file %s", config_filename);
1428                         free(store.key);
1429                         if (store.value_regex != NULL) {
1430                                 regfree(store.value_regex);
1431                                 free(store.value_regex);
1432                         }
1433                         ret = CONFIG_INVALID_FILE;
1434                         goto out_free;
1435                 }
1436
1437                 free(store.key);
1438                 if (store.value_regex != NULL) {
1439                         regfree(store.value_regex);
1440                         free(store.value_regex);
1441                 }
1442
1443                 /* if nothing to unset, or too many matches, error out */
1444                 if ((store.seen == 0 && value == NULL) ||
1445                                 (store.seen > 1 && multi_replace == 0)) {
1446                         ret = CONFIG_NOTHING_SET;
1447                         goto out_free;
1448                 }
1449
1450                 fstat(in_fd, &st);
1451                 contents_sz = xsize_t(st.st_size);
1452                 contents = xmmap(NULL, contents_sz, PROT_READ,
1453                         MAP_PRIVATE, in_fd, 0);
1454                 close(in_fd);
1455
1456                 if (store.seen == 0)
1457                         store.seen = 1;
1458
1459                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1460                         if (store.offset[i] == 0) {
1461                                 store.offset[i] = copy_end = contents_sz;
1462                         } else if (store.state != KEY_SEEN) {
1463                                 copy_end = store.offset[i];
1464                         } else
1465                                 copy_end = find_beginning_of_line(
1466                                         contents, contents_sz,
1467                                         store.offset[i]-2, &new_line);
1468
1469                         if (copy_end > 0 && contents[copy_end-1] != '\n')
1470                                 new_line = 1;
1471
1472                         /* write the first part of the config */
1473                         if (copy_end > copy_begin) {
1474                                 if (write_in_full(fd, contents + copy_begin,
1475                                                   copy_end - copy_begin) <
1476                                     copy_end - copy_begin)
1477                                         goto write_err_out;
1478                                 if (new_line &&
1479                                     write_str_in_full(fd, "\n") != 1)
1480                                         goto write_err_out;
1481                         }
1482                         copy_begin = store.offset[i];
1483                 }
1484
1485                 /* write the pair (value == NULL means unset) */
1486                 if (value != NULL) {
1487                         if (store.state == START) {
1488                                 if (!store_write_section(fd, key))
1489                                         goto write_err_out;
1490                         }
1491                         if (!store_write_pair(fd, key, value))
1492                                 goto write_err_out;
1493                 }
1494
1495                 /* write the rest of the config */
1496                 if (copy_begin < contents_sz)
1497                         if (write_in_full(fd, contents + copy_begin,
1498                                           contents_sz - copy_begin) <
1499                             contents_sz - copy_begin)
1500                                 goto write_err_out;
1501
1502                 munmap(contents, contents_sz);
1503         }
1504
1505         if (commit_lock_file(lock) < 0) {
1506                 error("could not commit config file %s", config_filename);
1507                 ret = CONFIG_NO_WRITE;
1508                 goto out_free;
1509         }
1510
1511         /*
1512          * lock is committed, so don't try to roll it back below.
1513          * NOTE: Since lockfile.c keeps a linked list of all created
1514          * lock_file structures, it isn't safe to free(lock).  It's
1515          * better to just leave it hanging around.
1516          */
1517         lock = NULL;
1518         ret = 0;
1519
1520 out_free:
1521         if (lock)
1522                 rollback_lock_file(lock);
1523         free(filename_buf);
1524         return ret;
1525
1526 write_err_out:
1527         ret = write_error(lock->filename);
1528         goto out_free;
1529
1530 }
1531
1532 int git_config_set_multivar(const char *key, const char *value,
1533                         const char *value_regex, int multi_replace)
1534 {
1535         return git_config_set_multivar_in_file(NULL, key, value, value_regex,
1536                                                multi_replace);
1537 }
1538
1539 static int section_name_match (const char *buf, const char *name)
1540 {
1541         int i = 0, j = 0, dot = 0;
1542         if (buf[i] != '[')
1543                 return 0;
1544         for (i = 1; buf[i] && buf[i] != ']'; i++) {
1545                 if (!dot && isspace(buf[i])) {
1546                         dot = 1;
1547                         if (name[j++] != '.')
1548                                 break;
1549                         for (i++; isspace(buf[i]); i++)
1550                                 ; /* do nothing */
1551                         if (buf[i] != '"')
1552                                 break;
1553                         continue;
1554                 }
1555                 if (buf[i] == '\\' && dot)
1556                         i++;
1557                 else if (buf[i] == '"' && dot) {
1558                         for (i++; isspace(buf[i]); i++)
1559                                 ; /* do_nothing */
1560                         break;
1561                 }
1562                 if (buf[i] != name[j++])
1563                         break;
1564         }
1565         if (buf[i] == ']' && name[j] == 0) {
1566                 /*
1567                  * We match, now just find the right length offset by
1568                  * gobbling up any whitespace after it, as well
1569                  */
1570                 i++;
1571                 for (; buf[i] && isspace(buf[i]); i++)
1572                         ; /* do nothing */
1573                 return i;
1574         }
1575         return 0;
1576 }
1577
1578 static int section_name_is_ok(const char *name)
1579 {
1580         /* Empty section names are bogus. */
1581         if (!*name)
1582                 return 0;
1583
1584         /*
1585          * Before a dot, we must be alphanumeric or dash. After the first dot,
1586          * anything goes, so we can stop checking.
1587          */
1588         for (; *name && *name != '.'; name++)
1589                 if (*name != '-' && !isalnum(*name))
1590                         return 0;
1591         return 1;
1592 }
1593
1594 /* if new_name == NULL, the section is removed instead */
1595 int git_config_rename_section_in_file(const char *config_filename,
1596                                       const char *old_name, const char *new_name)
1597 {
1598         int ret = 0, remove = 0;
1599         char *filename_buf = NULL;
1600         struct lock_file *lock;
1601         int out_fd;
1602         char buf[1024];
1603         FILE *config_file;
1604
1605         if (new_name && !section_name_is_ok(new_name)) {
1606                 ret = error("invalid section name: %s", new_name);
1607                 goto out;
1608         }
1609
1610         if (!config_filename)
1611                 config_filename = filename_buf = git_pathdup("config");
1612
1613         lock = xcalloc(sizeof(struct lock_file), 1);
1614         out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1615         if (out_fd < 0) {
1616                 ret = error("could not lock config file %s", config_filename);
1617                 goto out;
1618         }
1619
1620         if (!(config_file = fopen(config_filename, "rb"))) {
1621                 /* no config file means nothing to rename, no error */
1622                 goto unlock_and_out;
1623         }
1624
1625         while (fgets(buf, sizeof(buf), config_file)) {
1626                 int i;
1627                 int length;
1628                 char *output = buf;
1629                 for (i = 0; buf[i] && isspace(buf[i]); i++)
1630                         ; /* do nothing */
1631                 if (buf[i] == '[') {
1632                         /* it's a section */
1633                         int offset = section_name_match(&buf[i], old_name);
1634                         if (offset > 0) {
1635                                 ret++;
1636                                 if (new_name == NULL) {
1637                                         remove = 1;
1638                                         continue;
1639                                 }
1640                                 store.baselen = strlen(new_name);
1641                                 if (!store_write_section(out_fd, new_name)) {
1642                                         ret = write_error(lock->filename);
1643                                         goto out;
1644                                 }
1645                                 /*
1646                                  * We wrote out the new section, with
1647                                  * a newline, now skip the old
1648                                  * section's length
1649                                  */
1650                                 output += offset + i;
1651                                 if (strlen(output) > 0) {
1652                                         /*
1653                                          * More content means there's
1654                                          * a declaration to put on the
1655                                          * next line; indent with a
1656                                          * tab
1657                                          */
1658                                         output -= 1;
1659                                         output[0] = '\t';
1660                                 }
1661                         }
1662                         remove = 0;
1663                 }
1664                 if (remove)
1665                         continue;
1666                 length = strlen(output);
1667                 if (write_in_full(out_fd, output, length) != length) {
1668                         ret = write_error(lock->filename);
1669                         goto out;
1670                 }
1671         }
1672         fclose(config_file);
1673 unlock_and_out:
1674         if (commit_lock_file(lock) < 0)
1675                 ret = error("could not commit config file %s", config_filename);
1676 out:
1677         free(filename_buf);
1678         return ret;
1679 }
1680
1681 int git_config_rename_section(const char *old_name, const char *new_name)
1682 {
1683         return git_config_rename_section_in_file(NULL, old_name, new_name);
1684 }
1685
1686 /*
1687  * Call this to report error for your variable that should not
1688  * get a boolean value (i.e. "[my] var" means "true").
1689  */
1690 #undef config_error_nonbool
1691 int config_error_nonbool(const char *var)
1692 {
1693         return error("Missing value for '%s'", var);
1694 }
1695
1696 int parse_config_key(const char *var,
1697                      const char *section,
1698                      const char **subsection, int *subsection_len,
1699                      const char **key)
1700 {
1701         int section_len = strlen(section);
1702         const char *dot;
1703
1704         /* Does it start with "section." ? */
1705         if (prefixcmp(var, section) || var[section_len] != '.')
1706                 return -1;
1707
1708         /*
1709          * Find the key; we don't know yet if we have a subsection, but we must
1710          * parse backwards from the end, since the subsection may have dots in
1711          * it, too.
1712          */
1713         dot = strrchr(var, '.');
1714         *key = dot + 1;
1715
1716         /* Did we have a subsection at all? */
1717         if (dot == var + section_len) {
1718                 *subsection = NULL;
1719                 *subsection_len = 0;
1720         }
1721         else {
1722                 *subsection = var + section_len + 1;
1723                 *subsection_len = dot - *subsection;
1724         }
1725
1726         return 0;
1727 }