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.bare")) {
 495                 is_bare_repository_cfg = git_config_bool(var, value);
 496                 return 0;
 497         }
 498
 499         if (!strcmp(var, "core.ignorestat")) {
 500                 assume_unchanged = git_config_bool(var, value);
 501                 return 0;
 502         }
 503
 504         if (!strcmp(var, "core.prefersymlinkrefs")) {
 505                 prefer_symlink_refs = git_config_bool(var, value);
 506                 return 0;
 507         }
 508
 509         if (!strcmp(var, "core.logallrefupdates")) {
 510                 log_all_ref_updates = git_config_bool(var, value);
 511                 return 0;
 512         }
 513
 514         if (!strcmp(var, "core.warnambiguousrefs")) {
 515                 warn_ambiguous_refs = git_config_bool(var, value);
 516                 return 0;
 517         }
 518
 519         if (!strcmp(var, "core.abbrev")) {
 520                 int abbrev = git_config_int(var, value);
 521                 if (abbrev < minimum_abbrev || abbrev > 40)
 522                         return -1;
 523                 default_abbrev = abbrev;
 524                 return 0;
 525         }
 526
 527         if (!strcmp(var, "core.loosecompression")) {
 528                 int level = git_config_int(var, value);
 529                 if (level == -1)
 530                         level = Z_DEFAULT_COMPRESSION;
 531                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 532                         die("bad zlib compression level %d", level);
 533                 zlib_compression_level = level;
 534                 zlib_compression_seen = 1;
 535                 return 0;
 536         }
 537
 538         if (!strcmp(var, "core.compression")) {
 539                 int level = git_config_int(var, value);
 540                 if (level == -1)
 541                         level = Z_DEFAULT_COMPRESSION;
 542                 else if (level < 0 || level > Z_BEST_COMPRESSION)
 543                         die("bad zlib compression level %d", level);
 544                 core_compression_level = level;
 545                 core_compression_seen = 1;
 546                 if (!zlib_compression_seen)
 547                         zlib_compression_level = level;
 548                 return 0;
 549         }
 550
 551         if (!strcmp(var, "core.packedgitwindowsize")) {
 552                 int pgsz_x2 = getpagesize() * 2;
 553                 packed_git_window_size = git_config_int(var, value);
 554
 555                 /* This value must be multiple of (pagesize * 2) */
 556                 packed_git_window_size /= pgsz_x2;
 557                 if (packed_git_window_size < 1)
 558                         packed_git_window_size = 1;
 559                 packed_git_window_size *= pgsz_x2;
 560                 return 0;
 561         }
 562
 563         if (!strcmp(var, "core.bigfilethreshold")) {
 564                 long n = git_config_int(var, value);
 565                 big_file_threshold = 0 < n ? n : 0;
 566                 return 0;
 567         }
 568
 569         if (!strcmp(var, "core.packedgitlimit")) {
 570                 packed_git_limit = git_config_int(var, value);
 571                 return 0;
 572         }
 573
 574         if (!strcmp(var, "core.deltabasecachelimit")) {
 575                 delta_base_cache_limit = git_config_int(var, value);
 576                 return 0;
 577         }
 578
 579         if (!strcmp(var, "core.logpackaccess"))
 580                 return git_config_string(&log_pack_access, var, value);
 581
 582         if (!strcmp(var, "core.autocrlf")) {
 583                 if (value && !strcasecmp(value, "input")) {
 584                         if (core_eol == EOL_CRLF)
 585                                 return error("core.autocrlf=input conflicts with core.eol=crlf");
 586                         auto_crlf = AUTO_CRLF_INPUT;
 587                         return 0;
 588                 }
 589                 auto_crlf = git_config_bool(var, value);
 590                 return 0;
 591         }
 592
 593         if (!strcmp(var, "core.safecrlf")) {
 594                 if (value && !strcasecmp(value, "warn")) {
 595                         safe_crlf = SAFE_CRLF_WARN;
 596                         return 0;
 597                 }
 598                 safe_crlf = git_config_bool(var, value);
 599                 return 0;
 600         }
 601
 602         if (!strcmp(var, "core.eol")) {
 603                 if (value && !strcasecmp(value, "lf"))
 604                         core_eol = EOL_LF;
 605                 else if (value && !strcasecmp(value, "crlf"))
 606                         core_eol = EOL_CRLF;
 607                 else if (value && !strcasecmp(value, "native"))
 608                         core_eol = EOL_NATIVE;
 609                 else
 610                         core_eol = EOL_UNSET;
 611                 if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 612                         return error("core.autocrlf=input conflicts with core.eol=crlf");
 613                 return 0;
 614         }
 615
 616         if (!strcmp(var, "core.notesref")) {
 617                 notes_ref_name = xstrdup(value);
 618                 return 0;
 619         }
 620
 621         if (!strcmp(var, "core.pager"))
 622                 return git_config_string(&pager_program, var, value);
 623
 624         if (!strcmp(var, "core.editor"))
 625                 return git_config_string(&editor_program, var, value);
 626
 627         if (!strcmp(var, "core.askpass"))
 628                 return git_config_string(&askpass_program, var, value);
 629
 630         if (!strcmp(var, "core.excludesfile"))
 631                 return git_config_pathname(&excludes_file, var, value);
 632
 633         if (!strcmp(var, "core.whitespace")) {
 634                 if (!value)
 635                         return config_error_nonbool(var);
 636                 whitespace_rule_cfg = parse_whitespace_rule(value);
 637                 return 0;
 638         }
 639
 640         if (!strcmp(var, "core.fsyncobjectfiles")) {
 641                 fsync_object_files = git_config_bool(var, value);
 642                 return 0;
 643         }
 644
 645         if (!strcmp(var, "core.preloadindex")) {
 646                 core_preload_index = git_config_bool(var, value);
 647                 return 0;
 648         }
 649
 650         if (!strcmp(var, "core.createobject")) {
 651                 if (!strcmp(value, "rename"))
 652                         object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 653                 else if (!strcmp(value, "link"))
 654                         object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 655                 else
 656                         die("Invalid mode for object creation: %s", value);
 657                 return 0;
 658         }
 659
 660         if (!strcmp(var, "core.sparsecheckout")) {
 661                 core_apply_sparse_checkout = git_config_bool(var, value);
 662                 return 0;
 663         }
 664
 665         if (!strcmp(var, "core.hidedotfiles")) {
 666                 if (value && !strcasecmp(value, "dotgitonly")) {
 667                         hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
 668                         return 0;
 669                 }
 670                 hide_dotfiles = git_config_bool(var, value);
 671                 return 0;
 672         }
 673
 674         /* Add other config variables here and to Documentation/config.txt. */
 675         return 0;
 676 }
 677
 678 static int git_default_user_config(const char *var, const char *value)
 679 {
 680         if (!strcmp(var, "user.name")) {
 681                 if (!value)
 682                         return config_error_nonbool(var);
 683                 strlcpy(git_default_name, value, sizeof(git_default_name));
 684                 user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 685                 return 0;
 686         }
 687
 688         if (!strcmp(var, "user.email")) {
 689                 if (!value)
 690                         return config_error_nonbool(var);
 691                 strlcpy(git_default_email, value, sizeof(git_default_email));
 692                 user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 693                 return 0;
 694         }
 695
 696         /* Add other config variables here and to Documentation/config.txt. */
 697         return 0;
 698 }
 699
 700 static int git_default_i18n_config(const char *var, const char *value)
 701 {
 702         if (!strcmp(var, "i18n.commitencoding"))
 703                 return git_config_string(&git_commit_encoding, var, value);
 704
 705         if (!strcmp(var, "i18n.logoutputencoding"))
 706                 return git_config_string(&git_log_output_encoding, var, value);
 707
 708         /* Add other config variables here and to Documentation/config.txt. */
 709         return 0;
 710 }
 711
 712 static int git_default_branch_config(const char *var, const char *value)
 713 {
 714         if (!strcmp(var, "branch.autosetupmerge")) {
 715                 if (value && !strcasecmp(value, "always")) {
 716                         git_branch_track = BRANCH_TRACK_ALWAYS;
 717                         return 0;
 718                 }
 719                 git_branch_track = git_config_bool(var, value);
 720                 return 0;
 721         }
 722         if (!strcmp(var, "branch.autosetuprebase")) {
 723                 if (!value)
 724                         return config_error_nonbool(var);
 725                 else if (!strcmp(value, "never"))
 726                         autorebase = AUTOREBASE_NEVER;
 727                 else if (!strcmp(value, "local"))
 728                         autorebase = AUTOREBASE_LOCAL;
 729                 else if (!strcmp(value, "remote"))
 730                         autorebase = AUTOREBASE_REMOTE;
 731                 else if (!strcmp(value, "always"))
 732                         autorebase = AUTOREBASE_ALWAYS;
 733                 else
 734                         return error("Malformed value for %s", var);
 735                 return 0;
 736         }
 737
 738         /* Add other config variables here and to Documentation/config.txt. */
 739         return 0;
 740 }
 741
 742 static int git_default_push_config(const char *var, const char *value)
 743 {
 744         if (!strcmp(var, "push.default")) {
 745                 if (!value)
 746                         return config_error_nonbool(var);
 747                 else if (!strcmp(value, "nothing"))
 748                         push_default = PUSH_DEFAULT_NOTHING;
 749                 else if (!strcmp(value, "matching"))
 750                         push_default = PUSH_DEFAULT_MATCHING;
 751                 else if (!strcmp(value, "upstream"))
 752                         push_default = PUSH_DEFAULT_UPSTREAM;
 753                 else if (!strcmp(value, "tracking")) /* deprecated */
 754                         push_default = PUSH_DEFAULT_UPSTREAM;
 755                 else if (!strcmp(value, "current"))
 756                         push_default = PUSH_DEFAULT_CURRENT;
 757                 else {
 758                         error("Malformed value for %s: %s", var, value);
 759                         return error("Must be one of nothing, matching, "
 760                                      "tracking or current.");
 761                 }
 762                 return 0;
 763         }
 764
 765         /* Add other config variables here and to Documentation/config.txt. */
 766         return 0;
 767 }
 768
 769 static int git_default_mailmap_config(const char *var, const char *value)
 770 {
 771         if (!strcmp(var, "mailmap.file"))
 772                 return git_config_string(&git_mailmap_file, var, value);
 773
 774         /* Add other config variables here and to Documentation/config.txt. */
 775         return 0;
 776 }
 777
 778 int git_default_config(const char *var, const char *value, void *dummy)
 779 {
 780         if (!prefixcmp(var, "core."))
 781                 return git_default_core_config(var, value);
 782
 783         if (!prefixcmp(var, "user."))
 784                 return git_default_user_config(var, value);
 785
 786         if (!prefixcmp(var, "i18n."))
 787                 return git_default_i18n_config(var, value);
 788
 789         if (!prefixcmp(var, "branch."))
 790                 return git_default_branch_config(var, value);
 791
 792         if (!prefixcmp(var, "push."))
 793                 return git_default_push_config(var, value);
 794
 795         if (!prefixcmp(var, "mailmap."))
 796                 return git_default_mailmap_config(var, value);
 797
 798         if (!prefixcmp(var, "advice."))
 799                 return git_default_advice_config(var, value);
 800
 801         if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 802                 pager_use_color = git_config_bool(var,value);
 803                 return 0;
 804         }
 805
 806         /* Add other config variables here and to Documentation/config.txt. */
 807         return 0;
 808 }
 809
 810 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 811 {
 812         int ret;
 813         FILE *f = fopen(filename, "r");
 814
 815         ret = -1;
 816         if (f) {
 817                 config_file top;
 818
 819                 /* push config-file parsing state stack */
 820                 top.prev = cf;
 821                 top.f = f;
 822                 top.name = filename;
 823                 top.linenr = 1;
 824                 top.eof = 0;
 825                 strbuf_init(&top.value, 1024);
 826                 cf = &top;
 827
 828                 ret = git_parse_file(fn, data);
 829
 830                 /* pop config-file parsing state stack */
 831                 strbuf_release(&top.value);
 832                 cf = top.prev;
 833
 834                 fclose(f);
 835         }
 836         return ret;
 837 }
 838
 839 const char *git_etc_gitconfig(void)
 840 {
 841         static const char *system_wide;
 842         if (!system_wide)
 843                 system_wide = system_path(ETC_GITCONFIG);
 844         return system_wide;
 845 }
 846
 847 int git_env_bool(const char *k, int def)
 848 {
 849         const char *v = getenv(k);
 850         return v ? git_config_bool(k, v) : def;
 851 }
 852
 853 int git_config_system(void)
 854 {
 855         return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 856 }
 857
 858 int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 859 {
 860         int ret = 0, found = 0;
 861         const char *home = NULL;
 862
 863         /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
 864         if (config_exclusive_filename)
 865                 return git_config_from_file(fn, config_exclusive_filename, data);
 866         if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 867                 ret += git_config_from_file(fn, git_etc_gitconfig(),
 868                                             data);
 869                 found += 1;
 870         }
 871
 872         home = get_home_directory();
 873         if (home) {
 874                 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
 875                 if (!access(user_config, R_OK)) {
 876                         ret += git_config_from_file(fn, user_config, data);
 877                         found += 1;
 878                 }
 879                 free(user_config);
 880         }
 881
 882         if (repo_config && !access(repo_config, R_OK)) {
 883                 ret += git_config_from_file(fn, repo_config, data);
 884                 found += 1;
 885         }
 886
 887         switch (git_config_from_parameters(fn, data)) {
 888         case -1: /* error */
 889                 die("unable to parse command-line config");
 890                 break;
 891         case 0: /* found nothing */
 892                 break;
 893         default: /* found at least one item */
 894                 found++;
 895                 break;
 896         }
 897
 898         return ret == 0 ? found : ret;
 899 }
 900
 901 int git_config(config_fn_t fn, void *data)
 902 {
 903         char *repo_config = NULL;
 904         int ret;
 905
 906         repo_config = git_pathdup("config");
 907         ret = git_config_early(fn, data, repo_config);
 908         if (repo_config)
 909                 free(repo_config);
 910         return ret;
 911 }
 912
 913 /*
 914  * Find all the stuff for git_config_set() below.
 915  */
 916
 917 #define MAX_MATCHES 512
 918
 919 static struct {
 920         int baselen;
 921         char *key;
 922         int do_not_match;
 923         regex_t *value_regex;
 924         int multi_replace;
 925         size_t offset[MAX_MATCHES];
 926         enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 927         int seen;
 928 } store;
 929
 930 static int matches(const char *key, const char *value)
 931 {
 932         return !strcmp(key, store.key) &&
 933                 (store.value_regex == NULL ||
 934                  (store.do_not_match ^
 935                   !regexec(store.value_regex, value, 0, NULL, 0)));
 936 }
 937
 938 static int store_aux(const char *key, const char *value, void *cb)
 939 {
 940         const char *ep;
 941         size_t section_len;
 942         FILE *f = cf->f;
 943
 944         switch (store.state) {
 945         case KEY_SEEN:
 946                 if (matches(key, value)) {
 947                         if (store.seen == 1 && store.multi_replace == 0) {
 948                                 warning("%s has multiple values", key);
 949                         } else if (store.seen >= MAX_MATCHES) {
 950                                 error("too many matches for %s", key);
 951                                 return 1;
 952                         }
 953
 954                         store.offset[store.seen] = ftell(f);
 955                         store.seen++;
 956                 }
 957                 break;
 958         case SECTION_SEEN:
 959                 /*
 960                  * What we are looking for is in store.key (both
 961                  * section and var), and its section part is baselen
 962                  * long.  We found key (again, both section and var).
 963                  * We would want to know if this key is in the same
 964                  * section as what we are looking for.  We already
 965                  * know we are in the same section as what should
 966                  * hold store.key.
 967                  */
 968                 ep = strrchr(key, '.');
 969                 section_len = ep - key;
 970
 971                 if ((section_len != store.baselen) ||
 972                     memcmp(key, store.key, section_len+1)) {
 973                         store.state = SECTION_END_SEEN;
 974                         break;
 975                 }
 976
 977                 /*
 978                  * Do not increment matches: this is no match, but we
 979                  * just made sure we are in the desired section.
 980                  */
 981                 store.offset[store.seen] = ftell(f);
 982                 /* fallthru */
 983         case SECTION_END_SEEN:
 984         case START:
 985                 if (matches(key, value)) {
 986                         store.offset[store.seen] = ftell(f);
 987                         store.state = KEY_SEEN;
 988                         store.seen++;
 989                 } else {
 990                         if (strrchr(key, '.') - key == store.baselen &&
 991                               !strncmp(key, store.key, store.baselen)) {
 992                                         store.state = SECTION_SEEN;
 993                                         store.offset[store.seen] = ftell(f);
 994                         }
 995                 }
 996         }
 997         return 0;
 998 }
 999
1000 static int write_error(const char *filename)
1001 {
1002         error("failed to write new configuration file %s", filename);
1003
1004         /* Same error code as "failed to rename". */
1005         return 4;
1006 }
1007
1008 static int store_write_section(int fd, const char *key)
1009 {
1010         const char *dot;
1011         int i, success;
1012         struct strbuf sb = STRBUF_INIT;
1013
1014         dot = memchr(key, '.', store.baselen);
1015         if (dot) {
1016                 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1017                 for (i = dot - key + 1; i < store.baselen; i++) {
1018                         if (key[i] == '"' || key[i] == '\\')
1019                                 strbuf_addch(&sb, '\\');
1020                         strbuf_addch(&sb, key[i]);
1021                 }
1022                 strbuf_addstr(&sb, "\"]\n");
1023         } else {
1024                 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1025         }
1026
1027         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1028         strbuf_release(&sb);
1029
1030         return success;
1031 }
1032
1033 static int store_write_pair(int fd, const char *key, const char *value)
1034 {
1035         int i, success;
1036         int length = strlen(key + store.baselen + 1);
1037         const char *quote = "";
1038         struct strbuf sb = STRBUF_INIT;
1039
1040         /*
1041          * Check to see if the value needs to be surrounded with a dq pair.
1042          * Note that problematic characters are always backslash-quoted; this
1043          * check is about not losing leading or trailing SP and strings that
1044          * follow beginning-of-comment characters (i.e. ';' and '#') by the
1045          * configuration parser.
1046          */
1047         if (value[0] == ' ')
1048                 quote = "\"";
1049         for (i = 0; value[i]; i++)
1050                 if (value[i] == ';' || value[i] == '#')
1051                         quote = "\"";
1052         if (i && value[i - 1] == ' ')
1053                 quote = "\"";
1054
1055         strbuf_addf(&sb, "\t%.*s = %s",
1056                     length, key + store.baselen + 1, quote);
1057
1058         for (i = 0; value[i]; i++)
1059                 switch (value[i]) {
1060                 case '\n':
1061                         strbuf_addstr(&sb, "\\n");
1062                         break;
1063                 case '\t':
1064                         strbuf_addstr(&sb, "\\t");
1065                         break;
1066                 case '"':
1067                 case '\\':
1068                         strbuf_addch(&sb, '\\');
1069                 default:
1070                         strbuf_addch(&sb, value[i]);
1071                         break;
1072                 }
1073         strbuf_addf(&sb, "%s\n", quote);
1074
1075         success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1076         strbuf_release(&sb);
1077
1078         return success;
1079 }
1080
1081 static ssize_t find_beginning_of_line(const char *contents, size_t size,
1082         size_t offset_, int *found_bracket)
1083 {
1084         size_t equal_offset = size, bracket_offset = size;
1085         ssize_t offset;
1086
1087 contline:
1088         for (offset = offset_-2; offset > 0
1089                         && contents[offset] != '\n'; offset--)
1090                 switch (contents[offset]) {
1091                         case '=': equal_offset = offset; break;
1092                         case ']': bracket_offset = offset; break;
1093                 }
1094         if (offset > 0 && contents[offset-1] == '\\') {
1095                 offset_ = offset;
1096                 goto contline;
1097         }
1098         if (bracket_offset < equal_offset) {
1099                 *found_bracket = 1;
1100                 offset = bracket_offset+1;
1101         } else
1102                 offset++;
1103
1104         return offset;
1105 }
1106
1107 int git_config_set_in_file(const char *config_filename,
1108                         const char *key, const char *value)
1109 {
1110         return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1111 }
1112
1113 int git_config_set(const char *key, const char *value)
1114 {
1115         return git_config_set_multivar(key, value, NULL, 0);
1116 }
1117
1118 /*
1119  * Auxiliary function to sanity-check and split the key into the section
1120  * identifier and variable name.
1121  *
1122  * Returns 0 on success, -1 when there is an invalid character in the key and
1123  * -2 if there is no section name in the key.
1124  *
1125  * store_key - pointer to char* which will hold a copy of the key with
1126  *             lowercase section and variable name
1127  * baselen - pointer to int which will hold the length of the
1128  *           section + subsection part, can be NULL
1129  */
1130 int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1131 {
1132         int i, dot, baselen;
1133         const char *last_dot = strrchr(key, '.');
1134
1135         /*
1136          * Since "key" actually contains the section name and the real
1137          * key name separated by a dot, we have to know where the dot is.
1138          */
1139
1140         if (last_dot == NULL || last_dot == key) {
1141                 error("key does not contain a section: %s", key);
1142                 return -CONFIG_NO_SECTION_OR_NAME;
1143         }
1144
1145         if (!last_dot[1]) {
1146                 error("key does not contain variable name: %s", key);
1147                 return -CONFIG_NO_SECTION_OR_NAME;
1148         }
1149
1150         baselen = last_dot - key;
1151         if (baselen_)
1152                 *baselen_ = baselen;
1153
1154         /*
1155          * Validate the key and while at it, lower case it for matching.
1156          */
1157         *store_key = xmalloc(strlen(key) + 1);
1158
1159         dot = 0;
1160         for (i = 0; key[i]; i++) {
1161                 unsigned char c = key[i];
1162                 if (c == '.')
1163                         dot = 1;
1164                 /* Leave the extended basename untouched.. */
1165                 if (!dot || i > baselen) {
1166                         if (!iskeychar(c) ||
1167                             (i == baselen + 1 && !isalpha(c))) {
1168                                 error("invalid key: %s", key);
1169                                 goto out_free_ret_1;
1170                         }
1171                         c = tolower(c);
1172                 } else if (c == '\n') {
1173                         error("invalid key (newline): %s", key);
1174                         goto out_free_ret_1;
1175                 }
1176                 (*store_key)[i] = c;
1177         }
1178         (*store_key)[i] = 0;
1179
1180         return 0;
1181
1182 out_free_ret_1:
1183         free(*store_key);
1184         return -CONFIG_INVALID_KEY;
1185 }
1186
1187 /*
1188  * If value==NULL, unset in (remove from) config,
1189  * if value_regex!=NULL, disregard key/value pairs where value does not match.
1190  * if multi_replace==0, nothing, or only one matching key/value is replaced,
1191  *     else all matching key/values (regardless how many) are removed,
1192  *     before the new pair is written.
1193  *
1194  * Returns 0 on success.
1195  *
1196  * This function does this:
1197  *
1198  * - it locks the config file by creating ".git/config.lock"
1199  *
1200  * - it then parses the config using store_aux() as validator to find
1201  *   the position on the key/value pair to replace. If it is to be unset,
1202  *   it must be found exactly once.
1203  *
1204  * - the config file is mmap()ed and the part before the match (if any) is
1205  *   written to the lock file, then the changed part and the rest.
1206  *
1207  * - the config file is removed and the lock file rename()d to it.
1208  *
1209  */
1210 int git_config_set_multivar_in_file(const char *config_filename,
1211                                 const char *key, const char *value,
1212                                 const char *value_regex, int multi_replace)
1213 {
1214         int fd = -1, in_fd;
1215         int ret;
1216         struct lock_file *lock = NULL;
1217
1218         /* parse-key returns negative; flip the sign to feed exit(3) */
1219         ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1220         if (ret)
1221                 goto out_free;
1222
1223         store.multi_replace = multi_replace;
1224
1225
1226         /*
1227          * The lock serves a purpose in addition to locking: the new
1228          * contents of .git/config will be written into it.
1229          */
1230         lock = xcalloc(sizeof(struct lock_file), 1);
1231         fd = hold_lock_file_for_update(lock, config_filename, 0);
1232         if (fd < 0) {
1233                 error("could not lock config file %s: %s", config_filename, strerror(errno));
1234                 free(store.key);
1235                 ret = CONFIG_NO_LOCK;
1236                 goto out_free;
1237         }
1238
1239         /*
1240          * If .git/config does not exist yet, write a minimal version.
1241          */
1242         in_fd = open(config_filename, O_RDONLY);
1243         if ( in_fd < 0 ) {
1244                 free(store.key);
1245
1246                 if ( ENOENT != errno ) {
1247                         error("opening %s: %s", config_filename,
1248                               strerror(errno));
1249                         ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1250                         goto out_free;
1251                 }
1252                 /* if nothing to unset, error out */
1253                 if (value == NULL) {
1254                         ret = CONFIG_NOTHING_SET;
1255                         goto out_free;
1256                 }
1257
1258                 store.key = (char *)key;
1259                 if (!store_write_section(fd, key) ||
1260                     !store_write_pair(fd, key, value))
1261                         goto write_err_out;
1262         } else {
1263                 struct stat st;
1264                 char *contents;
1265                 size_t contents_sz, copy_begin, copy_end;
1266                 int i, new_line = 0;
1267
1268                 if (value_regex == NULL)
1269                         store.value_regex = NULL;
1270                 else {
1271                         if (value_regex[0] == '!') {
1272                                 store.do_not_match = 1;
1273                                 value_regex++;
1274                         } else
1275                                 store.do_not_match = 0;
1276
1277                         store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1278                         if (regcomp(store.value_regex, value_regex,
1279                                         REG_EXTENDED)) {
1280                                 error("invalid pattern: %s", value_regex);
1281                                 free(store.value_regex);
1282                                 ret = CONFIG_INVALID_PATTERN;
1283                                 goto out_free;
1284                         }
1285                 }
1286
1287                 store.offset[0] = 0;
1288                 store.state = START;
1289                 store.seen = 0;
1290
1291                 /*
1292                  * After this, store.offset will contain the *end* offset
1293                  * of the last match, or remain at 0 if no match was found.
1294                  * As a side effect, we make sure to transform only a valid
1295                  * existing config file.
1296                  */
1297                 if (git_config_from_file(store_aux, config_filename, NULL)) {
1298                         error("invalid config file %s", config_filename);
1299                         free(store.key);
1300                         if (store.value_regex != NULL) {
1301                                 regfree(store.value_regex);
1302                                 free(store.value_regex);
1303                         }
1304                         ret = CONFIG_INVALID_FILE;
1305                         goto out_free;
1306                 }
1307
1308                 free(store.key);
1309                 if (store.value_regex != NULL) {
1310                         regfree(store.value_regex);
1311                         free(store.value_regex);
1312                 }
1313
1314                 /* if nothing to unset, or too many matches, error out */
1315                 if ((store.seen == 0 && value == NULL) ||
1316                                 (store.seen > 1 && multi_replace == 0)) {
1317                         ret = CONFIG_NOTHING_SET;
1318                         goto out_free;
1319                 }
1320
1321                 fstat(in_fd, &st);
1322                 contents_sz = xsize_t(st.st_size);
1323                 contents = xmmap(NULL, contents_sz, PROT_READ,
1324                         MAP_PRIVATE, in_fd, 0);
1325                 close(in_fd);
1326
1327                 if (store.seen == 0)
1328                         store.seen = 1;
1329
1330                 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1331                         if (store.offset[i] == 0) {
1332                                 store.offset[i] = copy_end = contents_sz;
1333                         } else if (store.state != KEY_SEEN) {
1334                                 copy_end = store.offset[i];
1335                         } else
1336                                 copy_end = find_beginning_of_line(
1337                                         contents, contents_sz,
1338                                         store.offset[i]-2, &new_line);
1339
1340                         if (copy_end > 0 && contents[copy_end-1] != '\n')
1341                                 new_line = 1;
1342
1343                         /* write the first part of the config */
1344                         if (copy_end > copy_begin) {
1345                                 if (write_in_full(fd, contents + copy_begin,
1346                                                   copy_end - copy_begin) <
1347                                     copy_end - copy_begin)
1348                                         goto write_err_out;
1349                                 if (new_line &&
1350                                     write_str_in_full(fd, "\n") != 1)
1351                                         goto write_err_out;
1352                         }
1353                         copy_begin = store.offset[i];
1354                 }
1355
1356                 /* write the pair (value == NULL means unset) */
1357                 if (value != NULL) {
1358                         if (store.state == START) {
1359                                 if (!store_write_section(fd, key))
1360                                         goto write_err_out;
1361                         }
1362                         if (!store_write_pair(fd, key, value))
1363                                 goto write_err_out;
1364                 }
1365
1366                 /* write the rest of the config */
1367                 if (copy_begin < contents_sz)
1368                         if (write_in_full(fd, contents + copy_begin,
1369                                           contents_sz - copy_begin) <
1370                             contents_sz - copy_begin)
1371                                 goto write_err_out;
1372
1373                 munmap(contents, contents_sz);
1374         }
1375
1376         if (commit_lock_file(lock) < 0) {
1377                 error("could not commit config file %s", config_filename);
1378                 ret = CONFIG_NO_WRITE;
1379                 goto out_free;
1380         }
1381
1382         /*
1383          * lock is committed, so don't try to roll it back below.
1384          * NOTE: Since lockfile.c keeps a linked list of all created
1385          * lock_file structures, it isn't safe to free(lock).  It's
1386          * better to just leave it hanging around.
1387          */
1388         lock = NULL;
1389         ret = 0;
1390
1391 out_free:
1392         if (lock)
1393                 rollback_lock_file(lock);
1394         return ret;
1395
1396 write_err_out:
1397         ret = write_error(lock->filename);
1398         goto out_free;
1399
1400 }
1401
1402 int git_config_set_multivar(const char *key, const char *value,
1403                         const char *value_regex, int multi_replace)
1404 {
1405         const char *config_filename;
1406         char *buf = NULL;
1407         int ret;
1408
1409         if (config_exclusive_filename)
1410                 config_filename = config_exclusive_filename;
1411         else
1412                 config_filename = buf = git_pathdup("config");
1413
1414         ret = git_config_set_multivar_in_file(config_filename, key, value,
1415                                         value_regex, multi_replace);
1416         free(buf);
1417         return ret;
1418 }
1419
1420 static int section_name_match (const char *buf, const char *name)
1421 {
1422         int i = 0, j = 0, dot = 0;
1423         if (buf[i] != '[')
1424                 return 0;
1425         for (i = 1; buf[i] && buf[i] != ']'; i++) {
1426                 if (!dot && isspace(buf[i])) {
1427                         dot = 1;
1428                         if (name[j++] != '.')
1429                                 break;
1430                         for (i++; isspace(buf[i]); i++)
1431                                 ; /* do nothing */
1432                         if (buf[i] != '"')
1433                                 break;
1434                         continue;
1435                 }
1436                 if (buf[i] == '\\' && dot)
1437                         i++;
1438                 else if (buf[i] == '"' && dot) {
1439                         for (i++; isspace(buf[i]); i++)
1440                                 ; /* do_nothing */
1441                         break;
1442                 }
1443                 if (buf[i] != name[j++])
1444                         break;
1445         }
1446         if (buf[i] == ']' && name[j] == 0) {
1447                 /*
1448                  * We match, now just find the right length offset by
1449                  * gobbling up any whitespace after it, as well
1450                  */
1451                 i++;
1452                 for (; buf[i] && isspace(buf[i]); i++)
1453                         ; /* do nothing */
1454                 return i;
1455         }
1456         return 0;
1457 }
1458
1459 /* if new_name == NULL, the section is removed instead */
1460 int git_config_rename_section(const char *old_name, const char *new_name)
1461 {
1462         int ret = 0, remove = 0;
1463         char *config_filename;
1464         struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1465         int out_fd;
1466         char buf[1024];
1467         FILE *config_file;
1468
1469         if (config_exclusive_filename)
1470                 config_filename = xstrdup(config_exclusive_filename);
1471         else
1472                 config_filename = git_pathdup("config");
1473         out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1474         if (out_fd < 0) {
1475                 ret = error("could not lock config file %s", config_filename);
1476                 goto out;
1477         }
1478
1479         if (!(config_file = fopen(config_filename, "rb"))) {
1480                 /* no config file means nothing to rename, no error */
1481                 goto unlock_and_out;
1482         }
1483
1484         while (fgets(buf, sizeof(buf), config_file)) {
1485                 int i;
1486                 int length;
1487                 char *output = buf;
1488                 for (i = 0; buf[i] && isspace(buf[i]); i++)
1489                         ; /* do nothing */
1490                 if (buf[i] == '[') {
1491                         /* it's a section */
1492                         int offset = section_name_match(&buf[i], old_name);
1493                         if (offset > 0) {
1494                                 ret++;
1495                                 if (new_name == NULL) {
1496                                         remove = 1;
1497                                         continue;
1498                                 }
1499                                 store.baselen = strlen(new_name);
1500                                 if (!store_write_section(out_fd, new_name)) {
1501                                         ret = write_error(lock->filename);
1502                                         goto out;
1503                                 }
1504                                 /*
1505                                  * We wrote out the new section, with
1506                                  * a newline, now skip the old
1507                                  * section's length
1508                                  */
1509                                 output += offset + i;
1510                                 if (strlen(output) > 0) {
1511                                         /*
1512                                          * More content means there's
1513                                          * a declaration to put on the
1514                                          * next line; indent with a
1515                                          * tab
1516                                          */
1517                                         output -= 1;
1518                                         output[0] = '\t';
1519                                 }
1520                         }
1521                         remove = 0;
1522                 }
1523                 if (remove)
1524                         continue;
1525                 length = strlen(output);
1526                 if (write_in_full(out_fd, output, length) != length) {
1527                         ret = write_error(lock->filename);
1528                         goto out;
1529                 }
1530         }
1531         fclose(config_file);
1532 unlock_and_out:
1533         if (commit_lock_file(lock) < 0)
1534                 ret = error("could not commit config file %s", config_filename);
1535 out:
1536         free(config_filename);
1537         return ret;
1538 }
1539
1540 /*
1541  * Call this to report error for your variable that should not
1542  * get a boolean value (i.e. "[my] var" means "true").
1543  */
1544 int config_error_nonbool(const char *var)
1545 {
1546         return error("Missing value for '%s'", var);
1547 }