config.c

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