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 #define MAX_INCLUDE_DEPTH 10
  30 static const char include_depth_advice[] =
  31 "exceeded maximum include depth (%d) while including\n"
  32 "       %s\n"
  33 "from\n"
  34 "       %s\n"
  35 "Do you have circular includes?";
  36 static int handle_path_include(const char *path, struct config_include_data *inc)
  37 {
  38         int ret = 0;
  39         struct strbuf buf = STRBUF_INIT;
  40
  41         /*
  42          * Use an absolute path as-is, but interpret relative paths
  43          * based on the including config file.
  44          */
  45         if (!is_absolute_path(path)) {
  46                 char *slash;
  47
  48                 if (!cf || !cf->name)
  49                         return error("relative config includes must come from files");
  50
  51                 slash = find_last_dir_sep(cf->name);
  52                 if (slash)
  53                         strbuf_add(&buf, cf->name, slash - cf->name + 1);
  54                 strbuf_addstr(&buf, path);
  55                 path = buf.buf;
  56         }
  57
  58         if (!access(path, R_OK)) {
  59                 if (++inc->depth > MAX_INCLUDE_DEPTH)
  60                         die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
  61                             cf && cf->name ? cf->name : "the command line");
  62                 ret = git_config_from_file(git_config_include, path, inc);
  63                 inc->depth--;
  64         }
  65         strbuf_release(&buf);
  66         return ret;
  67 }
  68
  69 int git_config_include(const char *var, const char *value, void *data)
  70 {
  71         struct config_include_data *inc = data;
  72         const char *type;
  73         int ret;
  74
  75         /*
  76          * Pass along all values, including "include" directives; this makes it
  77          * possible to query information on the includes themselves.
  78          */
  79         ret = inc->fn(var, value, inc->data);
  80         if (ret < 0)
  81                 return ret;
  82
  83         type = skip_prefix(var, "include.");
  84         if (!type)
  85                 return ret;
  86
  87         if (!strcmp(type, "path"))
  88                 ret = handle_path_include(value, inc);
  89         return ret;
  90 }
  91
  92 static void lowercase(char *p)
  93 {
  94         for (; *p; p++)
  95                 *p = tolower(*p);
  96 }
  97
  98 void git_config_push_parameter(const char *text)
  99 {
 100         struct strbuf env = STRBUF_INIT;
 101         const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
 102         if (old) {
 103                 strbuf_addstr(&env, old);
 104                 strbuf_addch(&env, ' ');
 105         }
 106         sq_quote_buf(&env, text);
 107         setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
 108         strbuf_release(&env);
 109 }
 110
 111 int git_config_parse_parameter(const char *text,
 112                                config_fn_t fn, void *data)
 113 {
 114         struct strbuf **pair;
 115         pair = strbuf_split_str(text, '=', 2);
 116         if (!pair[0])
 117                 return error("bogus config parameter: %s", text);
 118         if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
 119                 strbuf_setlen(pair[0], pair[0]->len - 1);
 120         strbuf_trim(pair[0]);
 121         if (!pair[0]->len) {
 122                 strbuf_list_free(pair);
 123                 return error("bogus config parameter: %s", text);
 124         }
 125         lowercase(pair[0]->buf);
 126         if (fn(pair[0]->buf, pair[1] ? pair[1]->buf : NULL, data) < 0) {
 127                 strbuf_list_free(pair);
 128                 return -1;
 129         }
 130         strbuf_list_free(pair);
 131         return 0;
 132 }
 133
 134 int git_config_from_parameters(config_fn_t fn, void *data)
 135 {
 136         const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 137         char *envw;
 138         const char **argv = NULL;
 139         int nr = 0, alloc = 0;
 140         int i;
 141
 142         if (!env)
 143                 return 0;
 144         /* sq_dequote will write over it */
 145         envw = xstrdup(env);
 146
 147         if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 148                 free(envw);
 149                 return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
 150         }
 151
 152         for (i = 0; i < nr; i++) {
 153                 if (git_config_parse_parameter(argv[i], fn, data) < 0) {
 154                         free(argv);
 155                         free(envw);
 156                         return -1;
 157                 }
 158         }
 159
 160         free(argv);
 161         free(envw);
 162         return nr > 0;
 163 }
 164
 165 static int get_next_char(void)
 166 {
 167         int c;
 168         FILE *f;
 169
 170         c = '\n';
 171         if (cf && ((f = cf->f) != NULL)) {
 172                 c = fgetc(f);
 173                 if (c == '\r') {
 174                         /* DOS like systems */
 175                         c = fgetc(f);
 176                         if (c != '\n') {
 177                                 ungetc(c, f);
 178                                 c = '\r';
 179                         }
 180                 }
 181                 if (c == '\n')
 182                         cf->linenr++;
 183                 if (c == EOF) {
 184                         cf->eof = 1;
 185                         c = '\n';
 186                 }
 187         }
 188         return c;
 189 }
 190
 191 static char *parse_value(void)
 192 {
 193         int quote = 0, comment = 0, space = 0;
 194
 195         strbuf_reset(&cf->value);
 196         for (;;) {
 197                 int c = get_next_char();
 198                 if (c == '\n') {
 199                         if (quote) {
 200                                 cf->linenr--;
 201                                 return NULL;
 202                         }
 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                         goto error_incomplete_line;
 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                         goto error_incomplete_line;
 305                 if (c == '"')
 306                         break;
 307                 if (c == '\\') {
 308                         c = get_next_char();
 309                         if (c == '\n')
 310                                 goto error_incomplete_line;
 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 error_incomplete_line:
 322         cf->linenr--;
 323         return -1;
 324 }
 325
 326 static int get_base_var(char *name)
 327 {
 328         int baselen = 0;
 329
 330         for (;;) {
 331                 int c = get_next_char();
 332                 if (cf->eof)
 333                         return -1;
 334                 if (c == ']')
 335                         return baselen;
 336                 if (isspace(c))
 337                         return get_extended_base_var(name, baselen, c);
 338                 if (!iskeychar(c) && c != '.')
 339                         return -1;
 340                 if (baselen > MAXNAME / 2)
 341                         return -1;
 342                 name[baselen++] = tolower(c);
 343         }
 344 }
 345
 346 static int git_parse_file(config_fn_t fn, void *data)
 347 {
 348         int comment = 0;
 349         int baselen = 0;
 350         char *var = cf->var;
 351
 352         /* U+FEFF Byte Order Mark in UTF8 */
 353         static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 354         const unsigned char *bomptr = utf8_bom;
 355
 356         for (;;) {
 357                 int c = get_next_char();
 358                 if (bomptr && *bomptr) {
 359                         /* We are at the file beginning; skip UTF8-encoded BOM
 360                          * if present. Sane editors won't put this in on their
 361                          * own, but e.g. Windows Notepad will do it happily. */
 362                         if ((unsigned char) c == *bomptr) {
 363                                 bomptr++;
 364                                 continue;
 365                         } else {
 366                                 /* Do not tolerate partial BOM. */
 367                                 if (bomptr != utf8_bom)
 368                                         break;
 369                                 /* No BOM at file beginning. Cool. */
 370                                 bomptr = NULL;
 371                         }
 372                 }
 373                 if (c == '\n') {
 374                         if (cf->eof)
 375                                 return 0;
 376                         comment = 0;
 377                         continue;
 378                 }
 379                 if (comment || isspace(c))
 380                         continue;
 381                 if (c == '#' || c == ';') {
 382                         comment = 1;
 383                         continue;
 384                 }
 385                 if (c == '[') {
 386                         baselen = get_base_var(var);
 387                         if (baselen <= 0)
 388                                 break;
 389                         var[baselen++] = '.';
 390                         var[baselen] = 0;
 391                         continue;
 392                 }
 393                 if (!isalpha(c))
 394                         break;
 395                 var[baselen] = tolower(c);
 396                 if (get_value(fn, data, var, baselen+1) < 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
 567         if (!strcmp(var, "core.quotepath")) {
 568                 quote_path_fully = git_config_bool(var, value);
 569                 return 0;
 570         }
 571
 572         if (!strcmp(var, "core.symlinks")) {
 573                 has_symlinks = git_config_bool(var, value);
 574                 return 0;
 575         }
 576
 577         if (!strcmp(var, "core.ignorecase")) {
 578                 ignore_case = git_config_bool(var, value);
 579                 return 0;
 580         }
 581
 582         if (!strcmp(var, "core.attributesfile"))
 583                 return git_config_pathname(&git_attributes_file, var, value);
 584
 585         if (!strcmp(var, "core.bare")) {
 586                 is_bare_repository_cfg = git_config_bool(var, value);
 587                 return 0;
 588         }
 589
 590         if (!strcmp(var, "core.ignorestat")) {
 591                 assume_unchanged = git_config_bool(var, value);
 592                 return 0;
 593         }
 594
 595         if (!strcmp(var, "core.prefersymlinkrefs")) {
 596                 prefer_symlink_refs = git_config_bool(var, value);
 597                 return 0;
 598         }
 599
 600         if (!strcmp(var, "core.logallrefupdates")) {
 601                 log_all_ref_updates = git_config_bool(var, value);
 602                 return 0;
 603         }
 604
 605         if (!strcmp(var, "core.warnambiguousrefs")) {
 606                 warn_ambiguous_refs = git_config_bool(var, value);
 607                 return 0;
 608         }
 609
 610         if (!strcmp(var, "core.abbrev")) {
 611                 int abbrev = git_config_int(var, value);
 612                 if (abbrev < minimum_abbrev || abbrev > 40)
 613                         return -1;
 614                 default_abbrev = abbrev;
 615                 return 0;
 616         }
 617
 618         if (!strcmp(var, "core.loosecompression")) {
 619                 int level = git_config_int(var, value);
 620                 if (level == -1)
 621                         level = Z_DEFAULT_COMPRESSION;
 622                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 623                         die("bad zlib compression level %d", level);
 624                 zlib_compression_level = level;
 625                 zlib_compression_seen = 1;
 626                 return 0;
 627         }
 628
 629         if (!strcmp(var, "core.compression")) {
 630                 int level = git_config_int(var, value);
 631                 if (level == -1)
 632                         level = Z_DEFAULT_COMPRESSION;
 633                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 634                         die("bad zlib compression level %d", level);
 635                 core_compression_level = level;
 636                 core_compression_seen = 1;
 637                 if (!zlib_compression_seen)
 638                         zlib_compression_level = level;
 639                 return 0;
 640         }
 641
 642         if (!strcmp(var, "core.packedgitwindowsize")) {
 643                 int pgsz_x2 = getpagesize() * 2;
 644                 packed_git_window_size = git_config_ulong(var, value);
 645
 646                 /* This value must be multiple of (pagesize * 2) */
 647                 packed_git_window_size /= pgsz_x2;
 648                 if (packed_git_window_size < 1)
 649                         packed_git_window_size = 1;
 650                 packed_git_window_size *= pgsz_x2;
 651                 return 0;
 652         }
 653
 654         if (!strcmp(var, "core.bigfilethreshold")) {
 655                 big_file_threshold = git_config_ulong(var, value);
 656                 return 0;
 657         }
 658
 659         if (!strcmp(var, "core.packedgitlimit")) {
 660                 packed_git_limit = git_config_ulong(var, value);
 661                 return 0;
 662         }
 663
 664         if (!strcmp(var, "core.deltabasecachelimit")) {
 665                 delta_base_cache_limit = git_config_ulong(var, value);
 666                 return 0;
 667         }
 668
 669         if (!strcmp(var, "core.logpackaccess"))
 670                 return git_config_string(&log_pack_access, var, value);
 671
 672         if (!strcmp(var, "core.autocrlf")) {
 673                 if (value && !strcasecmp(value, "input")) {
 674                         if (core_eol == EOL_CRLF)
 675                                 return error("core.autocrlf=input conflicts with core.eol=crlf");
 676                         auto_crlf = AUTO_CRLF_INPUT;
 677                         return 0;
 678                 }
 679                 auto_crlf = git_config_bool(var, value);
 680                 return 0;
 681         }
 682
 683         if (!strcmp(var, "core.safecrlf")) {
 684                 if (value && !strcasecmp(value, "warn")) {
 685                         safe_crlf = SAFE_CRLF_WARN;
 686                         return 0;
 687                 }
 688                 safe_crlf = git_config_bool(var, value);
 689                 return 0;
 690         }
 691
 692         if (!strcmp(var, "core.eol")) {
 693                 if (value && !strcasecmp(value, "lf"))
 694                         core_eol = EOL_LF;
 695                 else if (value && !strcasecmp(value, "crlf"))
 696                         core_eol = EOL_CRLF;
 697                 else if (value && !strcasecmp(value, "native"))
 698                         core_eol = EOL_NATIVE;
 699                 else
 700                         core_eol = EOL_UNSET;
 701                 if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 702                         return error("core.autocrlf=input conflicts with core.eol=crlf");
 703                 return 0;
 704         }
 705
 706         if (!strcmp(var, "core.notesref")) {
 707                 notes_ref_name = xstrdup(value);
 708                 return 0;
 709         }
 710
 711         if (!strcmp(var, "core.pager"))
 712                 return git_config_string(&pager_program, var, value);
 713
 714         if (!strcmp(var, "core.editor"))
 715                 return git_config_string(&editor_program, var, value);
 716
 717         if (!strcmp(var, "core.askpass"))
 718                 return git_config_string(&askpass_program, var, value);
 719
 720         if (!strcmp(var, "core.excludesfile"))
 721                 return git_config_pathname(&excludes_file, var, value);
 722
 723         if (!strcmp(var, "core.whitespace")) {
 724                 if (!value)
 725                         return config_error_nonbool(var);
 726                 whitespace_rule_cfg = parse_whitespace_rule(value);
 727                 return 0;
 728         }
 729
 730         if (!strcmp(var, "core.fsyncobjectfiles")) {
 731                 fsync_object_files = git_config_bool(var, value);
 732                 return 0;
 733         }
 734
 735         if (!strcmp(var, "core.preloadindex")) {
 736                 core_preload_index = git_config_bool(var, value);
 737                 return 0;
 738         }
 739
 740         if (!strcmp(var, "core.createobject")) {
 741                 if (!strcmp(value, "rename"))
 742                         object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 743                 else if (!strcmp(value, "link"))
 744                         object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 745                 else
 746                         die("Invalid mode for object creation: %s", value);
 747                 return 0;
 748         }
 749
 750         if (!strcmp(var, "core.sparsecheckout")) {
 751                 core_apply_sparse_checkout = git_config_bool(var, value);
 752                 return 0;
 753         }
 754
 755         /* Add other config variables here and to Documentation/config.txt. */
 756         return 0;
 757 }
 758
 759 static int git_default_user_config(const char *var, const char *value)
 760 {
 761         if (!strcmp(var, "user.name")) {
 762                 if (!value)
 763                         return config_error_nonbool(var);
 764                 strlcpy(git_default_name, value, sizeof(git_default_name));
 765                 user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 766                 return 0;
 767         }
 768
 769         if (!strcmp(var, "user.email")) {
 770                 if (!value)
 771                         return config_error_nonbool(var);
 772                 strlcpy(git_default_email, value, sizeof(git_default_email));
 773                 user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 774                 return 0;
 775         }
 776
 777         /* Add other config variables here and to Documentation/config.txt. */
 778         return 0;
 779 }
 780
 781 static int git_default_i18n_config(const char *var, const char *value)
 782 {
 783         if (!strcmp(var, "i18n.commitencoding"))
 784                 return git_config_string(&git_commit_encoding, var, value);
 785
 786         if (!strcmp(var, "i18n.logoutputencoding"))
 787                 return git_config_string(&git_log_output_encoding, var, value);
 788
 789         /* Add other config variables here and to Documentation/config.txt. */
 790         return 0;
 791 }
 792
 793 static int git_default_branch_config(const char *var, const char *value)
 794 {
 795         if (!strcmp(var, "branch.autosetupmerge")) {
 796                 if (value && !strcasecmp(value, "always")) {
 797                         git_branch_track = BRANCH_TRACK_ALWAYS;
 798                         return 0;
 799                 }
 800                 git_branch_track = git_config_bool(var, value);
 801                 return 0;
 802         }
 803         if (!strcmp(var, "branch.autosetuprebase")) {
 804                 if (!value)
 805                         return config_error_nonbool(var);
 806                 else if (!strcmp(value, "never"))
 807                         autorebase = AUTOREBASE_NEVER;
 808                 else if (!strcmp(value, "local"))
 809                         autorebase = AUTOREBASE_LOCAL;
 810                 else if (!strcmp(value, "remote"))
 811                         autorebase = AUTOREBASE_REMOTE;
 812                 else if (!strcmp(value, "always"))
 813                         autorebase = AUTOREBASE_ALWAYS;
 814                 else
 815                         return error("Malformed value for %s", var);
 816                 return 0;
 817         }
 818
 819         /* Add other config variables here and to Documentation/config.txt. */
 820         return 0;
 821 }
 822
 823 static int git_default_push_config(const char *var, const char *value)
 824 {
 825         if (!strcmp(var, "push.default")) {
 826                 if (!value)
 827                         return config_error_nonbool(var);
 828                 else if (!strcmp(value, "nothing"))
 829                         push_default = PUSH_DEFAULT_NOTHING;
 830                 else if (!strcmp(value, "matching"))
 831                         push_default = PUSH_DEFAULT_MATCHING;
 832                 else if (!strcmp(value, "upstream"))
 833                         push_default = PUSH_DEFAULT_UPSTREAM;
 834                 else if (!strcmp(value, "tracking")) /* deprecated */
 835                         push_default = PUSH_DEFAULT_UPSTREAM;
 836                 else if (!strcmp(value, "current"))
 837                         push_default = PUSH_DEFAULT_CURRENT;
 838                 else {
 839                         error("Malformed value for %s: %s", var, value);
 840                         return error("Must be one of nothing, matching, "
 841                                      "tracking or current.");
 842                 }
 843                 return 0;
 844         }
 845
 846         /* Add other config variables here and to Documentation/config.txt. */
 847         return 0;
 848 }
 849
 850 static int git_default_mailmap_config(const char *var, const char *value)
 851 {
 852         if (!strcmp(var, "mailmap.file"))
 853                 return git_config_string(&git_mailmap_file, var, value);
 854
 855         /* Add other config variables here and to Documentation/config.txt. */
 856         return 0;
 857 }
 858
 859 int git_default_config(const char *var, const char *value, void *dummy)
 860 {
 861         if (!prefixcmp(var, "core."))
 862                 return git_default_core_config(var, value);
 863
 864         if (!prefixcmp(var, "user."))
 865                 return git_default_user_config(var, value);
 866
 867         if (!prefixcmp(var, "i18n."))
 868                 return git_default_i18n_config(var, value);
 869
 870         if (!prefixcmp(var, "branch."))
 871                 return git_default_branch_config(var, value);
 872
 873         if (!prefixcmp(var, "push."))
 874                 return git_default_push_config(var, value);
 875
 876         if (!prefixcmp(var, "mailmap."))
 877                 return git_default_mailmap_config(var, value);
 878
 879         if (!prefixcmp(var, "advice."))
 880                 return git_default_advice_config(var, value);
 881
 882         if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 883                 pager_use_color = git_config_bool(var,value);
 884                 return 0;
 885         }
 886
 887         if (!strcmp(var, "pack.packsizelimit")) {
 888                 pack_size_limit_cfg = git_config_ulong(var, value);
 889                 return 0;
 890         }
 891         /* Add other config variables here and to Documentation/config.txt. */
 892         return 0;
 893 }
 894
 895 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 896 {
 897         int ret;
 898         FILE *f = fopen(filename, "r");
 899
 900         ret = -1;
 901         if (f) {
 902                 config_file top;
 903
 904                 /* push config-file parsing state stack */
 905                 top.prev = cf;
 906                 top.f = f;
 907                 top.name = filename;
 908                 top.linenr = 1;
 909                 top.eof = 0;
 910                 strbuf_init(&top.value, 1024);
 911                 cf = &top;
 912
 913                 ret = git_parse_file(fn, data);
 914
 915                 /* pop config-file parsing state stack */
 916                 strbuf_release(&top.value);
 917                 cf = top.prev;
 918
 919                 fclose(f);
 920         }
 921         return ret;
 922 }
 923
 924 const char *git_etc_gitconfig(void)
 925 {
 926         static const char *system_wide;
 927         if (!system_wide)
 928                 system_wide = system_path(ETC_GITCONFIG);
 929         return system_wide;
 930 }
 931
 932 int git_env_bool(const char *k, int def)
 933 {
 934         const char *v = getenv(k);
 935         return v ? git_config_bool(k, v) : def;
 936 }
 937
 938 int git_config_system(void)
 939 {
 940         return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 941 }
 942
 943 int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 944 {
 945         int ret = 0, found = 0;
 946         const char *home = NULL;
 947
 948         if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 949                 ret += git_config_from_file(fn, git_etc_gitconfig(),
 950                                             data);
 951                 found += 1;
 952         }
 953
 954         home = getenv("HOME");
 955         if (home) {
 956                 char buf[PATH_MAX];
 957                 char *user_config = mksnpath(buf, sizeof(buf), "%s/.gitconfig", home);
 958                 if (!access(user_config, R_OK)) {
 959                         ret += git_config_from_file(fn, user_config, data);
 960                         found += 1;
 961                 }
 962         }
 963
 964         if (repo_config && !access(repo_config, R_OK)) {
 965                 ret += git_config_from_file(fn, repo_config, data);
 966                 found += 1;
 967         }
 968
 969         switch (git_config_from_parameters(fn, data)) {
 970         case -1: /* error */
 971                 die("unable to parse command-line config");
 972                 break;
 973         case 0: /* found nothing */
 974                 break;
 975         default: /* found at least one item */
 976                 found++;
 977                 break;
 978         }
 979
 980         return ret == 0 ? found : ret;
 981 }
 982
 983 int git_config_with_options(config_fn_t fn, void *data,
 984                             const char *filename, int respect_includes)
 985 {
 986         char *repo_config = NULL;
 987         int ret;
 988         struct config_include_data inc = CONFIG_INCLUDE_INIT;
 989
 990         if (respect_includes) {
 991                 inc.fn = fn;
 992                 inc.data = data;
 993                 fn = git_config_include;
 994                 data = &inc;
 995         }
 996
 997         /*
 998          * If we have a specific filename, use it. Otherwise, follow the
 999          * regular lookup sequence.
1000          */
1001         if (filename)
1002                 return git_config_from_file(fn, filename, data);
1003
1004         repo_config = git_pathdup("config");
1005         ret = git_config_early(fn, data, repo_config);
1006         if (repo_config)
1007                 free(repo_config);
1008         return ret;
1009 }
1010
1011 int git_config(config_fn_t fn, void *data)
1012 {
1013         return git_config_with_options(fn, data, NULL, 1);
1014 }
1015
1016 /*
1017  * Find all the stuff for git_config_set() below.
1018  */
1019
1020 #define MAX_MATCHES 512
1021
1022 static struct {
1023         int baselen;
1024         char *key;
1025         int do_not_match;
1026         regex_t *value_regex;
1027         int multi_replace;
1028         size_t offset[MAX_MATCHES];
1029         enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1030         int seen;
1031 } store;
1032
1033 static int matches(const char *key, const char *value)
1034 {
1035         return !strcmp(key, store.key) &&
1036                 (store.value_regex == NULL ||
1037                  (store.do_not_match ^
1038                   !regexec(store.value_regex, value, 0, NULL, 0)));
1039 }
1040
1041 static int store_aux(const char *key, const char *value, void *cb)
1042 {
1043         const char *ep;
1044         size_t section_len;
1045         FILE *f = cf->f;
1046
1047         switch (store.state) {
1048         case KEY_SEEN:
1049                 if (matches(key, value)) {
1050                         if (store.seen == 1 && store.multi_replace == 0) {
1051                                 warning("%s has multiple values", key);
1052                         } else if (store.seen >= MAX_MATCHES) {
1053                                 error("too many matches for %s", key);
1054                                 return 1;
1055                         }
1056
1057                         store.offset[store.seen] = ftell(f);
1058                         store.seen++;
1059                 }
1060                 break;
1061         case SECTION_SEEN:
1062                 /*
1063                  * What we are looking for is in store.key (both
1064                  * section and var), and its section part is baselen
1065                  * long.  We found key (again, both section and var).
1066                  * We would want to know if this key is in the same
1067                  * section as what we are looking for.  We already
1068                  * know we are in the same section as what should
1069                  * hold store.key.
1070                  */
1071                 ep = strrchr(key, '.');
1072                 section_len = ep - key;
1073
1074                 if ((section_len != store.baselen) ||
1075                     memcmp(key, store.key, section_len+1)) {
1076                         store.state = SECTION_END_SEEN;
1077                         break;
1078                 }
1079
1080                 /*
1081                  * Do not increment matches: this is no match, but we
1082                  * just made sure we are in the desired section.
1083                  */
1084                 store.offset[store.seen] = ftell(f);
1085                 /* fallthru */
1086         case SECTION_END_SEEN:
1087         case START:
1088                 if (matches(key, value)) {
1089                         store.offset[store.seen] = ftell(f);
1090                         store.state = KEY_SEEN;
1091                         store.seen++;
1092                 } else {
1093                         if (strrchr(key, '.') - key == store.baselen &&
1094                               !strncmp(key, store.key, store.baselen)) {
1095                                         store.state = SECTION_SEEN;
1096                                         store.offset[store.seen] = ftell(f);
1097                         }
1098                 }
1099         }
1100         return 0;
1101 }
1102
1103 static int write_error(const char *filename)
1104 {
1105         error("failed to write new configuration file %s", filename);
1106
1107         /* Same error code as "failed to rename". */
1108         return 4;
1109 }
1110
1111 static int store_write_section(int fd, const char *key)
1112 {
1113         const char *dot;
1114         int i, success;
1115         struct strbuf sb = STRBUF_INIT;
1116
1117         dot = memchr(key, '.', store.baselen);
1118         if (dot) {
1119                 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1120                 for (i = dot - key + 1; i < store.baselen; i++) {
1121                         if (key[i] == '"' || key[i] == '\\')
1122                                 strbuf_addch(&sb, '\\');
1123                         strbuf_addch(&sb, key[i]);
1124                 }
1125                 strbuf_addstr(&sb, "\"]\n");
1126         } else {
1127                 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1128         }
1129
1130         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1131         strbuf_release(&sb);
1132
1133         return success;
1134 }
1135
1136 static int store_write_pair(int fd, const char *key, const char *value)
1137 {
1138         int i, success;
1139         int length = strlen(key + store.baselen + 1);
1140         const char *quote = "";
1141         struct strbuf sb = STRBUF_INIT;
1142
1143         /*
1144          * Check to see if the value needs to be surrounded with a dq pair.
1145          * Note that problematic characters are always backslash-quoted; this
1146          * check is about not losing leading or trailing SP and strings that
1147          * follow beginning-of-comment characters (i.e. ';' and '#') by the
1148          * configuration parser.
1149          */
1150         if (value[0] == ' ')
1151                 quote = "\"";
1152         for (i = 0; value[i]; i++)
1153                 if (value[i] == ';' || value[i] == '#')
1154                         quote = "\"";
1155         if (i && value[i - 1] == ' ')
1156                 quote = "\"";
1157
1158         strbuf_addf(&sb, "\t%.*s = %s",
1159                     length, key + store.baselen + 1, quote);
1160
1161         for (i = 0; value[i]; i++)
1162                 switch (value[i]) {
1163                 case '\n':
1164                         strbuf_addstr(&sb, "\\n");
1165                         break;
1166                 case '\t':
1167                         strbuf_addstr(&sb, "\\t");
1168                         break;
1169                 case '"':
1170                 case '\\':
1171                         strbuf_addch(&sb, '\\');
1172                 default:
1173                         strbuf_addch(&sb, value[i]);
1174                         break;
1175                 }
1176         strbuf_addf(&sb, "%s\n", quote);
1177
1178         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1179         strbuf_release(&sb);
1180
1181         return success;
1182 }
1183
1184 static ssize_t find_beginning_of_line(const char *contents, size_t size,
1185         size_t offset_, int *found_bracket)
1186 {
1187         size_t equal_offset = size, bracket_offset = size;
1188         ssize_t offset;
1189
1190 contline:
1191         for (offset = offset_-2; offset > 0
1192                         && contents[offset] != '\n'; offset--)
1193                 switch (contents[offset]) {
1194                         case '=': equal_offset = offset; break;
1195                         case ']': bracket_offset = offset; break;
1196                 }
1197         if (offset > 0 && contents[offset-1] == '\\') {
1198                 offset_ = offset;
1199                 goto contline;
1200         }
1201         if (bracket_offset < equal_offset) {
1202                 *found_bracket = 1;
1203                 offset = bracket_offset+1;
1204         } else
1205                 offset++;
1206
1207         return offset;
1208 }
1209
1210 int git_config_set_in_file(const char *config_filename,
1211                         const char *key, const char *value)
1212 {
1213         return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1214 }
1215
1216 int git_config_set(const char *key, const char *value)
1217 {
1218         return git_config_set_multivar(key, value, NULL, 0);
1219 }
1220
1221 /*
1222  * Auxiliary function to sanity-check and split the key into the section
1223  * identifier and variable name.
1224  *
1225  * Returns 0 on success, -1 when there is an invalid character in the key and
1226  * -2 if there is no section name in the key.
1227  *
1228  * store_key - pointer to char* which will hold a copy of the key with
1229  *             lowercase section and variable name
1230  * baselen - pointer to int which will hold the length of the
1231  *           section + subsection part, can be NULL
1232  */
1233 int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1234 {
1235         int i, dot, baselen;
1236         const char *last_dot = strrchr(key, '.');
1237
1238         /*
1239          * Since "key" actually contains the section name and the real
1240          * key name separated by a dot, we have to know where the dot is.
1241          */
1242
1243         if (last_dot == NULL || last_dot == key) {
1244                 error("key does not contain a section: %s", key);
1245                 return -CONFIG_NO_SECTION_OR_NAME;
1246         }
1247
1248         if (!last_dot[1]) {
1249                 error("key does not contain variable name: %s", key);
1250                 return -CONFIG_NO_SECTION_OR_NAME;
1251         }
1252
1253         baselen = last_dot - key;
1254         if (baselen_)
1255                 *baselen_ = baselen;
1256
1257         /*
1258          * Validate the key and while at it, lower case it for matching.
1259          */
1260         *store_key = xmalloc(strlen(key) + 1);
1261
1262         dot = 0;
1263         for (i = 0; key[i]; i++) {
1264                 unsigned char c = key[i];
1265                 if (c == '.')
1266                         dot = 1;
1267                 /* Leave the extended basename untouched.. */
1268                 if (!dot || i > baselen) {
1269                         if (!iskeychar(c) ||
1270                             (i == baselen + 1 && !isalpha(c))) {
1271                                 error("invalid key: %s", key);
1272                                 goto out_free_ret_1;
1273                         }
1274                         c = tolower(c);
1275                 } else if (c == '\n') {
1276                         error("invalid key (newline): %s", key);
1277                         goto out_free_ret_1;
1278                 }
1279                 (*store_key)[i] = c;
1280         }
1281         (*store_key)[i] = 0;
1282
1283         return 0;
1284
1285 out_free_ret_1:
1286         free(*store_key);
1287         return -CONFIG_INVALID_KEY;
1288 }
1289
1290 /*
1291  * If value==NULL, unset in (remove from) config,
1292  * if value_regex!=NULL, disregard key/value pairs where value does not match.
1293  * if multi_replace==0, nothing, or only one matching key/value is replaced,
1294  *     else all matching key/values (regardless how many) are removed,
1295  *     before the new pair is written.
1296  *
1297  * Returns 0 on success.
1298  *
1299  * This function does this:
1300  *
1301  * - it locks the config file by creating ".git/config.lock"
1302  *
1303  * - it then parses the config using store_aux() as validator to find
1304  *   the position on the key/value pair to replace. If it is to be unset,
1305  *   it must be found exactly once.
1306  *
1307  * - the config file is mmap()ed and the part before the match (if any) is
1308  *   written to the lock file, then the changed part and the rest.
1309  *
1310  * - the config file is removed and the lock file rename()d to it.
1311  *
1312  */
1313 int git_config_set_multivar_in_file(const char *config_filename,
1314                                 const char *key, const char *value,
1315                                 const char *value_regex, int multi_replace)
1316 {
1317         int fd = -1, in_fd;
1318         int ret;
1319         struct lock_file *lock = NULL;
1320         char *filename_buf = NULL;
1321
1322         /* parse-key returns negative; flip the sign to feed exit(3) */
1323         ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1324         if (ret)
1325                 goto out_free;
1326
1327         store.multi_replace = multi_replace;
1328
1329         if (!config_filename)
1330                 config_filename = filename_buf = git_pathdup("config");
1331
1332         /*
1333          * The lock serves a purpose in addition to locking: the new
1334          * contents of .git/config will be written into it.
1335          */
1336         lock = xcalloc(sizeof(struct lock_file), 1);
1337         fd = hold_lock_file_for_update(lock, config_filename, 0);
1338         if (fd < 0) {
1339                 error("could not lock config file %s: %s", config_filename, strerror(errno));
1340                 free(store.key);
1341                 ret = CONFIG_NO_LOCK;
1342                 goto out_free;
1343         }
1344
1345         /*
1346          * If .git/config does not exist yet, write a minimal version.
1347          */
1348         in_fd = open(config_filename, O_RDONLY);
1349         if ( in_fd < 0 ) {
1350                 free(store.key);
1351
1352                 if ( ENOENT != errno ) {
1353                         error("opening %s: %s", config_filename,
1354                               strerror(errno));
1355                         ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1356                         goto out_free;
1357                 }
1358                 /* if nothing to unset, error out */
1359                 if (value == NULL) {
1360                         ret = CONFIG_NOTHING_SET;
1361                         goto out_free;
1362                 }
1363
1364                 store.key = (char *)key;
1365                 if (!store_write_section(fd, key) ||
1366                     !store_write_pair(fd, key, value))
1367                         goto write_err_out;
1368         } else {
1369                 struct stat st;
1370                 char *contents;
1371                 size_t contents_sz, copy_begin, copy_end;
1372                 int i, new_line = 0;
1373
1374                 if (value_regex == NULL)
1375                         store.value_regex = NULL;
1376                 else {
1377                         if (value_regex[0] == '!') {
1378                                 store.do_not_match = 1;
1379                                 value_regex++;
1380                         } else
1381                                 store.do_not_match = 0;
1382
1383                         store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1384                         if (regcomp(store.value_regex, value_regex,
1385                                         REG_EXTENDED)) {
1386                                 error("invalid pattern: %s", value_regex);
1387                                 free(store.value_regex);
1388                                 ret = CONFIG_INVALID_PATTERN;
1389                                 goto out_free;
1390                         }
1391                 }
1392
1393                 store.offset[0] = 0;
1394                 store.state = START;
1395                 store.seen = 0;
1396
1397                 /*
1398                  * After this, store.offset will contain the *end* offset
1399                  * of the last match, or remain at 0 if no match was found.
1400                  * As a side effect, we make sure to transform only a valid
1401                  * existing config file.
1402                  */
1403                 if (git_config_from_file(store_aux, config_filename, NULL)) {
1404                         error("invalid config file %s", config_filename);
1405                         free(store.key);
1406                         if (store.value_regex != NULL) {
1407                                 regfree(store.value_regex);
1408                                 free(store.value_regex);
1409                         }
1410                         ret = CONFIG_INVALID_FILE;
1411                         goto out_free;
1412                 }
1413
1414                 free(store.key);
1415                 if (store.value_regex != NULL) {
1416                         regfree(store.value_regex);
1417                         free(store.value_regex);
1418                 }
1419
1420                 /* if nothing to unset, or too many matches, error out */
1421                 if ((store.seen == 0 && value == NULL) ||
1422                                 (store.seen > 1 && multi_replace == 0)) {
1423                         ret = CONFIG_NOTHING_SET;
1424                         goto out_free;
1425                 }
1426
1427                 fstat(in_fd, &st);
1428                 contents_sz = xsize_t(st.st_size);
1429                 contents = xmmap(NULL, contents_sz, PROT_READ,
1430                         MAP_PRIVATE, in_fd, 0);
1431                 close(in_fd);
1432
1433                 if (store.seen == 0)
1434                         store.seen = 1;
1435
1436                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1437                         if (store.offset[i] == 0) {
1438                                 store.offset[i] = copy_end = contents_sz;
1439                         } else if (store.state != KEY_SEEN) {
1440                                 copy_end = store.offset[i];
1441                         } else
1442                                 copy_end = find_beginning_of_line(
1443                                         contents, contents_sz,
1444                                         store.offset[i]-2, &new_line);
1445
1446                         if (copy_end > 0 && contents[copy_end-1] != '\n')
1447                                 new_line = 1;
1448
1449                         /* write the first part of the config */
1450                         if (copy_end > copy_begin) {
1451                                 if (write_in_full(fd, contents + copy_begin,
1452                                                   copy_end - copy_begin) <
1453                                     copy_end - copy_begin)
1454                                         goto write_err_out;
1455                                 if (new_line &&
1456                                     write_str_in_full(fd, "\n") != 1)
1457                                         goto write_err_out;
1458                         }
1459                         copy_begin = store.offset[i];
1460                 }
1461
1462                 /* write the pair (value == NULL means unset) */
1463                 if (value != NULL) {
1464                         if (store.state == START) {
1465                                 if (!store_write_section(fd, key))
1466                                         goto write_err_out;
1467                         }
1468                         if (!store_write_pair(fd, key, value))
1469                                 goto write_err_out;
1470                 }
1471
1472                 /* write the rest of the config */
1473                 if (copy_begin < contents_sz)
1474                         if (write_in_full(fd, contents + copy_begin,
1475                                           contents_sz - copy_begin) <
1476                             contents_sz - copy_begin)
1477                                 goto write_err_out;
1478
1479                 munmap(contents, contents_sz);
1480         }
1481
1482         if (commit_lock_file(lock) < 0) {
1483                 error("could not commit config file %s", config_filename);
1484                 ret = CONFIG_NO_WRITE;
1485                 goto out_free;
1486         }
1487
1488         /*
1489          * lock is committed, so don't try to roll it back below.
1490          * NOTE: Since lockfile.c keeps a linked list of all created
1491          * lock_file structures, it isn't safe to free(lock).  It's
1492          * better to just leave it hanging around.
1493          */
1494         lock = NULL;
1495         ret = 0;
1496
1497 out_free:
1498         if (lock)
1499                 rollback_lock_file(lock);
1500         free(filename_buf);
1501         return ret;
1502
1503 write_err_out:
1504         ret = write_error(lock->filename);
1505         goto out_free;
1506
1507 }
1508
1509 int git_config_set_multivar(const char *key, const char *value,
1510                         const char *value_regex, int multi_replace)
1511 {
1512         return git_config_set_multivar_in_file(NULL, key, value, value_regex,
1513                                                multi_replace);
1514 }
1515
1516 static int section_name_match (const char *buf, const char *name)
1517 {
1518         int i = 0, j = 0, dot = 0;
1519         if (buf[i] != '[')
1520                 return 0;
1521         for (i = 1; buf[i] && buf[i] != ']'; i++) {
1522                 if (!dot && isspace(buf[i])) {
1523                         dot = 1;
1524                         if (name[j++] != '.')
1525                                 break;
1526                         for (i++; isspace(buf[i]); i++)
1527                                 ; /* do nothing */
1528                         if (buf[i] != '"')
1529                                 break;
1530                         continue;
1531                 }
1532                 if (buf[i] == '\\' && dot)
1533                         i++;
1534                 else if (buf[i] == '"' && dot) {
1535                         for (i++; isspace(buf[i]); i++)
1536                                 ; /* do_nothing */
1537                         break;
1538                 }
1539                 if (buf[i] != name[j++])
1540                         break;
1541         }
1542         if (buf[i] == ']' && name[j] == 0) {
1543                 /*
1544                  * We match, now just find the right length offset by
1545                  * gobbling up any whitespace after it, as well
1546                  */
1547                 i++;
1548                 for (; buf[i] && isspace(buf[i]); i++)
1549                         ; /* do nothing */
1550                 return i;
1551         }
1552         return 0;
1553 }
1554
1555 static int section_name_is_ok(const char *name)
1556 {
1557         /* Empty section names are bogus. */
1558         if (!*name)
1559                 return 0;
1560
1561         /*
1562          * Before a dot, we must be alphanumeric or dash. After the first dot,
1563          * anything goes, so we can stop checking.
1564          */
1565         for (; *name && *name != '.'; name++)
1566                 if (*name != '-' && !isalnum(*name))
1567                         return 0;
1568         return 1;
1569 }
1570
1571 /* if new_name == NULL, the section is removed instead */
1572 int git_config_rename_section_in_file(const char *config_filename,
1573                                       const char *old_name, const char *new_name)
1574 {
1575         int ret = 0, remove = 0;
1576         char *filename_buf = NULL;
1577         struct lock_file *lock;
1578         int out_fd;
1579         char buf[1024];
1580         FILE *config_file;
1581
1582         if (new_name && !section_name_is_ok(new_name)) {
1583                 ret = error("invalid section name: %s", new_name);
1584                 goto out;
1585         }
1586
1587         if (!config_filename)
1588                 config_filename = filename_buf = git_pathdup("config");
1589
1590         lock = xcalloc(sizeof(struct lock_file), 1);
1591         out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1592         if (out_fd < 0) {
1593                 ret = error("could not lock config file %s", config_filename);
1594                 goto out;
1595         }
1596
1597         if (!(config_file = fopen(config_filename, "rb"))) {
1598                 /* no config file means nothing to rename, no error */
1599                 goto unlock_and_out;
1600         }
1601
1602         while (fgets(buf, sizeof(buf), config_file)) {
1603                 int i;
1604                 int length;
1605                 char *output = buf;
1606                 for (i = 0; buf[i] && isspace(buf[i]); i++)
1607                         ; /* do nothing */
1608                 if (buf[i] == '[') {
1609                         /* it's a section */
1610                         int offset = section_name_match(&buf[i], old_name);
1611                         if (offset > 0) {
1612                                 ret++;
1613                                 if (new_name == NULL) {
1614                                         remove = 1;
1615                                         continue;
1616                                 }
1617                                 store.baselen = strlen(new_name);
1618                                 if (!store_write_section(out_fd, new_name)) {
1619                                         ret = write_error(lock->filename);
1620                                         goto out;
1621                                 }
1622                                 /*
1623                                  * We wrote out the new section, with
1624                                  * a newline, now skip the old
1625                                  * section's length
1626                                  */
1627                                 output += offset + i;
1628                                 if (strlen(output) > 0) {
1629                                         /*
1630                                          * More content means there's
1631                                          * a declaration to put on the
1632                                          * next line; indent with a
1633                                          * tab
1634                                          */
1635                                         output -= 1;
1636                                         output[0] = '\t';
1637                                 }
1638                         }
1639                         remove = 0;
1640                 }
1641                 if (remove)
1642                         continue;
1643                 length = strlen(output);
1644                 if (write_in_full(out_fd, output, length) != length) {
1645                         ret = write_error(lock->filename);
1646                         goto out;
1647                 }
1648         }
1649         fclose(config_file);
1650 unlock_and_out:
1651         if (commit_lock_file(lock) < 0)
1652                 ret = error("could not commit config file %s", config_filename);
1653 out:
1654         free(filename_buf);
1655         return ret;
1656 }
1657
1658 int git_config_rename_section(const char *old_name, const char *new_name)
1659 {
1660         return git_config_rename_section_in_file(NULL, old_name, new_name);
1661 }
1662
1663 /*
1664  * Call this to report error for your variable that should not
1665  * get a boolean value (i.e. "[my] var" means "true").
1666  */
1667 int config_error_nonbool(const char *var)
1668 {
1669         return error("Missing value for '%s'", var);
1670 }