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