Andrew's git / gitweb.git / config.c
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config.con commit Merge branch 'tj/maint-imap-send-remove-unused' (5c36594)
   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
  15typedef 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
  25static config_file *cf;
  26
  27static int zlib_compression_seen;
  28
  29const char *config_exclusive_filename = NULL;
  30
  31static void lowercase(char *p)
  32{
  33        for (; *p; p++)
  34                *p = tolower(*p);
  35}
  36
  37void 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
  50int 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
  73int 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
 104static 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
 130static 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
 189static inline int iskeychar(int c)
 190{
 191        return isalnum(c) || c == '-';
 192}
 193
 194static 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
 225static 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
 260static 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
 280static 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
 336static int parse_unit_factor(const char *end, uintmax_t *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
 355static int git_parse_long(const char *value, long *ret)
 356{
 357        if (value && *value) {
 358                char *end;
 359                intmax_t val;
 360                uintmax_t uval;
 361                uintmax_t factor = 1;
 362
 363                errno = 0;
 364                val = strtoimax(value, &end, 0);
 365                if (errno == ERANGE)
 366                        return 0;
 367                if (!parse_unit_factor(end, &factor))
 368                        return 0;
 369                uval = abs(val);
 370                uval *= factor;
 371                if ((uval > maximum_signed_value_of_type(long)) ||
 372                    (abs(val) > uval))
 373                        return 0;
 374                val *= factor;
 375                *ret = val;
 376                return 1;
 377        }
 378        return 0;
 379}
 380
 381int git_parse_ulong(const char *value, unsigned long *ret)
 382{
 383        if (value && *value) {
 384                char *end;
 385                uintmax_t val;
 386                uintmax_t oldval;
 387
 388                errno = 0;
 389                val = strtoumax(value, &end, 0);
 390                if (errno == ERANGE)
 391                        return 0;
 392                oldval = val;
 393                if (!parse_unit_factor(end, &val))
 394                        return 0;
 395                if ((val > maximum_unsigned_value_of_type(long)) ||
 396                    (oldval > val))
 397                        return 0;
 398                *ret = val;
 399                return 1;
 400        }
 401        return 0;
 402}
 403
 404static void die_bad_config(const char *name)
 405{
 406        if (cf && cf->name)
 407                die("bad config value for '%s' in %s", name, cf->name);
 408        die("bad config value for '%s'", name);
 409}
 410
 411int git_config_int(const char *name, const char *value)
 412{
 413        long ret = 0;
 414        if (!git_parse_long(value, &ret))
 415                die_bad_config(name);
 416        return ret;
 417}
 418
 419unsigned long git_config_ulong(const char *name, const char *value)
 420{
 421        unsigned long ret;
 422        if (!git_parse_ulong(value, &ret))
 423                die_bad_config(name);
 424        return ret;
 425}
 426
 427static int git_config_maybe_bool_text(const char *name, const char *value)
 428{
 429        if (!value)
 430                return 1;
 431        if (!*value)
 432                return 0;
 433        if (!strcasecmp(value, "true")
 434            || !strcasecmp(value, "yes")
 435            || !strcasecmp(value, "on"))
 436                return 1;
 437        if (!strcasecmp(value, "false")
 438            || !strcasecmp(value, "no")
 439            || !strcasecmp(value, "off"))
 440                return 0;
 441        return -1;
 442}
 443
 444int git_config_maybe_bool(const char *name, const char *value)
 445{
 446        long v = git_config_maybe_bool_text(name, value);
 447        if (0 <= v)
 448                return v;
 449        if (git_parse_long(value, &v))
 450                return !!v;
 451        return -1;
 452}
 453
 454int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 455{
 456        int v = git_config_maybe_bool_text(name, value);
 457        if (0 <= v) {
 458                *is_bool = 1;
 459                return v;
 460        }
 461        *is_bool = 0;
 462        return git_config_int(name, value);
 463}
 464
 465int git_config_bool(const char *name, const char *value)
 466{
 467        int discard;
 468        return !!git_config_bool_or_int(name, value, &discard);
 469}
 470
 471int git_config_string(const char **dest, const char *var, const char *value)
 472{
 473        if (!value)
 474                return config_error_nonbool(var);
 475        *dest = xstrdup(value);
 476        return 0;
 477}
 478
 479int git_config_pathname(const char **dest, const char *var, const char *value)
 480{
 481        if (!value)
 482                return config_error_nonbool(var);
 483        *dest = expand_user_path(value);
 484        if (!*dest)
 485                die("Failed to expand user dir in: '%s'", value);
 486        return 0;
 487}
 488
 489static int git_default_core_config(const char *var, const char *value)
 490{
 491        /* This needs a better name */
 492        if (!strcmp(var, "core.filemode")) {
 493                trust_executable_bit = git_config_bool(var, value);
 494                return 0;
 495        }
 496        if (!strcmp(var, "core.trustctime")) {
 497                trust_ctime = git_config_bool(var, value);
 498                return 0;
 499        }
 500
 501        if (!strcmp(var, "core.quotepath")) {
 502                quote_path_fully = git_config_bool(var, value);
 503                return 0;
 504        }
 505
 506        if (!strcmp(var, "core.symlinks")) {
 507                has_symlinks = git_config_bool(var, value);
 508                return 0;
 509        }
 510
 511        if (!strcmp(var, "core.ignorecase")) {
 512                ignore_case = git_config_bool(var, value);
 513                return 0;
 514        }
 515
 516        if (!strcmp(var, "core.attributesfile"))
 517                return git_config_pathname(&git_attributes_file, var, value);
 518
 519        if (!strcmp(var, "core.bare")) {
 520                is_bare_repository_cfg = git_config_bool(var, value);
 521                return 0;
 522        }
 523
 524        if (!strcmp(var, "core.ignorestat")) {
 525                assume_unchanged = git_config_bool(var, value);
 526                return 0;
 527        }
 528
 529        if (!strcmp(var, "core.prefersymlinkrefs")) {
 530                prefer_symlink_refs = git_config_bool(var, value);
 531                return 0;
 532        }
 533
 534        if (!strcmp(var, "core.logallrefupdates")) {
 535                log_all_ref_updates = git_config_bool(var, value);
 536                return 0;
 537        }
 538
 539        if (!strcmp(var, "core.warnambiguousrefs")) {
 540                warn_ambiguous_refs = git_config_bool(var, value);
 541                return 0;
 542        }
 543
 544        if (!strcmp(var, "core.abbrev")) {
 545                int abbrev = git_config_int(var, value);
 546                if (abbrev < minimum_abbrev || abbrev > 40)
 547                        return -1;
 548                default_abbrev = abbrev;
 549                return 0;
 550        }
 551
 552        if (!strcmp(var, "core.loosecompression")) {
 553                int level = git_config_int(var, value);
 554                if (level == -1)
 555                        level = Z_DEFAULT_COMPRESSION;
 556                else if (level < 0 || level > Z_BEST_COMPRESSION)
 557                        die("bad zlib compression level %d", level);
 558                zlib_compression_level = level;
 559                zlib_compression_seen = 1;
 560                return 0;
 561        }
 562
 563        if (!strcmp(var, "core.compression")) {
 564                int level = git_config_int(var, value);
 565                if (level == -1)
 566                        level = Z_DEFAULT_COMPRESSION;
 567                else if (level < 0 || level > Z_BEST_COMPRESSION)
 568                        die("bad zlib compression level %d", level);
 569                core_compression_level = level;
 570                core_compression_seen = 1;
 571                if (!zlib_compression_seen)
 572                        zlib_compression_level = level;
 573                return 0;
 574        }
 575
 576        if (!strcmp(var, "core.packedgitwindowsize")) {
 577                int pgsz_x2 = getpagesize() * 2;
 578                packed_git_window_size = git_config_ulong(var, value);
 579
 580                /* This value must be multiple of (pagesize * 2) */
 581                packed_git_window_size /= pgsz_x2;
 582                if (packed_git_window_size < 1)
 583                        packed_git_window_size = 1;
 584                packed_git_window_size *= pgsz_x2;
 585                return 0;
 586        }
 587
 588        if (!strcmp(var, "core.bigfilethreshold")) {
 589                big_file_threshold = git_config_ulong(var, value);
 590                return 0;
 591        }
 592
 593        if (!strcmp(var, "core.packedgitlimit")) {
 594                packed_git_limit = git_config_ulong(var, value);
 595                return 0;
 596        }
 597
 598        if (!strcmp(var, "core.deltabasecachelimit")) {
 599                delta_base_cache_limit = git_config_ulong(var, value);
 600                return 0;
 601        }
 602
 603        if (!strcmp(var, "core.logpackaccess"))
 604                return git_config_string(&log_pack_access, var, value);
 605
 606        if (!strcmp(var, "core.autocrlf")) {
 607                if (value && !strcasecmp(value, "input")) {
 608                        if (core_eol == EOL_CRLF)
 609                                return error("core.autocrlf=input conflicts with core.eol=crlf");
 610                        auto_crlf = AUTO_CRLF_INPUT;
 611                        return 0;
 612                }
 613                auto_crlf = git_config_bool(var, value);
 614                return 0;
 615        }
 616
 617        if (!strcmp(var, "core.safecrlf")) {
 618                if (value && !strcasecmp(value, "warn")) {
 619                        safe_crlf = SAFE_CRLF_WARN;
 620                        return 0;
 621                }
 622                safe_crlf = git_config_bool(var, value);
 623                return 0;
 624        }
 625
 626        if (!strcmp(var, "core.eol")) {
 627                if (value && !strcasecmp(value, "lf"))
 628                        core_eol = EOL_LF;
 629                else if (value && !strcasecmp(value, "crlf"))
 630                        core_eol = EOL_CRLF;
 631                else if (value && !strcasecmp(value, "native"))
 632                        core_eol = EOL_NATIVE;
 633                else
 634                        core_eol = EOL_UNSET;
 635                if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 636                        return error("core.autocrlf=input conflicts with core.eol=crlf");
 637                return 0;
 638        }
 639
 640        if (!strcmp(var, "core.notesref")) {
 641                notes_ref_name = xstrdup(value);
 642                return 0;
 643        }
 644
 645        if (!strcmp(var, "core.pager"))
 646                return git_config_string(&pager_program, var, value);
 647
 648        if (!strcmp(var, "core.editor"))
 649                return git_config_string(&editor_program, var, value);
 650
 651        if (!strcmp(var, "core.askpass"))
 652                return git_config_string(&askpass_program, var, value);
 653
 654        if (!strcmp(var, "core.excludesfile"))
 655                return git_config_pathname(&excludes_file, var, value);
 656
 657        if (!strcmp(var, "core.whitespace")) {
 658                if (!value)
 659                        return config_error_nonbool(var);
 660                whitespace_rule_cfg = parse_whitespace_rule(value);
 661                return 0;
 662        }
 663
 664        if (!strcmp(var, "core.fsyncobjectfiles")) {
 665                fsync_object_files = git_config_bool(var, value);
 666                return 0;
 667        }
 668
 669        if (!strcmp(var, "core.preloadindex")) {
 670                core_preload_index = git_config_bool(var, value);
 671                return 0;
 672        }
 673
 674        if (!strcmp(var, "core.createobject")) {
 675                if (!strcmp(value, "rename"))
 676                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 677                else if (!strcmp(value, "link"))
 678                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 679                else
 680                        die("Invalid mode for object creation: %s", value);
 681                return 0;
 682        }
 683
 684        if (!strcmp(var, "core.sparsecheckout")) {
 685                core_apply_sparse_checkout = git_config_bool(var, value);
 686                return 0;
 687        }
 688
 689        /* Add other config variables here and to Documentation/config.txt. */
 690        return 0;
 691}
 692
 693static int git_default_user_config(const char *var, const char *value)
 694{
 695        if (!strcmp(var, "user.name")) {
 696                if (!value)
 697                        return config_error_nonbool(var);
 698                strlcpy(git_default_name, value, sizeof(git_default_name));
 699                user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 700                return 0;
 701        }
 702
 703        if (!strcmp(var, "user.email")) {
 704                if (!value)
 705                        return config_error_nonbool(var);
 706                strlcpy(git_default_email, value, sizeof(git_default_email));
 707                user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 708                return 0;
 709        }
 710
 711        /* Add other config variables here and to Documentation/config.txt. */
 712        return 0;
 713}
 714
 715static int git_default_i18n_config(const char *var, const char *value)
 716{
 717        if (!strcmp(var, "i18n.commitencoding"))
 718                return git_config_string(&git_commit_encoding, var, value);
 719
 720        if (!strcmp(var, "i18n.logoutputencoding"))
 721                return git_config_string(&git_log_output_encoding, var, value);
 722
 723        /* Add other config variables here and to Documentation/config.txt. */
 724        return 0;
 725}
 726
 727static int git_default_branch_config(const char *var, const char *value)
 728{
 729        if (!strcmp(var, "branch.autosetupmerge")) {
 730                if (value && !strcasecmp(value, "always")) {
 731                        git_branch_track = BRANCH_TRACK_ALWAYS;
 732                        return 0;
 733                }
 734                git_branch_track = git_config_bool(var, value);
 735                return 0;
 736        }
 737        if (!strcmp(var, "branch.autosetuprebase")) {
 738                if (!value)
 739                        return config_error_nonbool(var);
 740                else if (!strcmp(value, "never"))
 741                        autorebase = AUTOREBASE_NEVER;
 742                else if (!strcmp(value, "local"))
 743                        autorebase = AUTOREBASE_LOCAL;
 744                else if (!strcmp(value, "remote"))
 745                        autorebase = AUTOREBASE_REMOTE;
 746                else if (!strcmp(value, "always"))
 747                        autorebase = AUTOREBASE_ALWAYS;
 748                else
 749                        return error("Malformed value for %s", var);
 750                return 0;
 751        }
 752
 753        /* Add other config variables here and to Documentation/config.txt. */
 754        return 0;
 755}
 756
 757static int git_default_push_config(const char *var, const char *value)
 758{
 759        if (!strcmp(var, "push.default")) {
 760                if (!value)
 761                        return config_error_nonbool(var);
 762                else if (!strcmp(value, "nothing"))
 763                        push_default = PUSH_DEFAULT_NOTHING;
 764                else if (!strcmp(value, "matching"))
 765                        push_default = PUSH_DEFAULT_MATCHING;
 766                else if (!strcmp(value, "upstream"))
 767                        push_default = PUSH_DEFAULT_UPSTREAM;
 768                else if (!strcmp(value, "tracking")) /* deprecated */
 769                        push_default = PUSH_DEFAULT_UPSTREAM;
 770                else if (!strcmp(value, "current"))
 771                        push_default = PUSH_DEFAULT_CURRENT;
 772                else {
 773                        error("Malformed value for %s: %s", var, value);
 774                        return error("Must be one of nothing, matching, "
 775                                     "tracking or current.");
 776                }
 777                return 0;
 778        }
 779
 780        /* Add other config variables here and to Documentation/config.txt. */
 781        return 0;
 782}
 783
 784static int git_default_mailmap_config(const char *var, const char *value)
 785{
 786        if (!strcmp(var, "mailmap.file"))
 787                return git_config_string(&git_mailmap_file, var, value);
 788
 789        /* Add other config variables here and to Documentation/config.txt. */
 790        return 0;
 791}
 792
 793int git_default_config(const char *var, const char *value, void *dummy)
 794{
 795        if (!prefixcmp(var, "core."))
 796                return git_default_core_config(var, value);
 797
 798        if (!prefixcmp(var, "user."))
 799                return git_default_user_config(var, value);
 800
 801        if (!prefixcmp(var, "i18n."))
 802                return git_default_i18n_config(var, value);
 803
 804        if (!prefixcmp(var, "branch."))
 805                return git_default_branch_config(var, value);
 806
 807        if (!prefixcmp(var, "push."))
 808                return git_default_push_config(var, value);
 809
 810        if (!prefixcmp(var, "mailmap."))
 811                return git_default_mailmap_config(var, value);
 812
 813        if (!prefixcmp(var, "advice."))
 814                return git_default_advice_config(var, value);
 815
 816        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 817                pager_use_color = git_config_bool(var,value);
 818                return 0;
 819        }
 820
 821        /* Add other config variables here and to Documentation/config.txt. */
 822        return 0;
 823}
 824
 825int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 826{
 827        int ret;
 828        FILE *f = fopen(filename, "r");
 829
 830        ret = -1;
 831        if (f) {
 832                config_file top;
 833
 834                /* push config-file parsing state stack */
 835                top.prev = cf;
 836                top.f = f;
 837                top.name = filename;
 838                top.linenr = 1;
 839                top.eof = 0;
 840                strbuf_init(&top.value, 1024);
 841                cf = &top;
 842
 843                ret = git_parse_file(fn, data);
 844
 845                /* pop config-file parsing state stack */
 846                strbuf_release(&top.value);
 847                cf = top.prev;
 848
 849                fclose(f);
 850        }
 851        return ret;
 852}
 853
 854const char *git_etc_gitconfig(void)
 855{
 856        static const char *system_wide;
 857        if (!system_wide)
 858                system_wide = system_path(ETC_GITCONFIG);
 859        return system_wide;
 860}
 861
 862int git_env_bool(const char *k, int def)
 863{
 864        const char *v = getenv(k);
 865        return v ? git_config_bool(k, v) : def;
 866}
 867
 868int git_config_system(void)
 869{
 870        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 871}
 872
 873int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 874{
 875        int ret = 0, found = 0;
 876        const char *home = NULL;
 877
 878        /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
 879        if (config_exclusive_filename)
 880                return git_config_from_file(fn, config_exclusive_filename, data);
 881        if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 882                ret += git_config_from_file(fn, git_etc_gitconfig(),
 883                                            data);
 884                found += 1;
 885        }
 886
 887        home = getenv("HOME");
 888        if (home) {
 889                char buf[PATH_MAX];
 890                char *user_config = mksnpath(buf, sizeof(buf), "%s/.gitconfig", home);
 891                if (!access(user_config, R_OK)) {
 892                        ret += git_config_from_file(fn, user_config, data);
 893                        found += 1;
 894                }
 895        }
 896
 897        if (repo_config && !access(repo_config, R_OK)) {
 898                ret += git_config_from_file(fn, repo_config, data);
 899                found += 1;
 900        }
 901
 902        switch (git_config_from_parameters(fn, data)) {
 903        case -1: /* error */
 904                die("unable to parse command-line config");
 905                break;
 906        case 0: /* found nothing */
 907                break;
 908        default: /* found at least one item */
 909                found++;
 910                break;
 911        }
 912
 913        return ret == 0 ? found : ret;
 914}
 915
 916int git_config(config_fn_t fn, void *data)
 917{
 918        char *repo_config = NULL;
 919        int ret;
 920
 921        repo_config = git_pathdup("config");
 922        ret = git_config_early(fn, data, repo_config);
 923        if (repo_config)
 924                free(repo_config);
 925        return ret;
 926}
 927
 928/*
 929 * Find all the stuff for git_config_set() below.
 930 */
 931
 932#define MAX_MATCHES 512
 933
 934static struct {
 935        int baselen;
 936        char *key;
 937        int do_not_match;
 938        regex_t *value_regex;
 939        int multi_replace;
 940        size_t offset[MAX_MATCHES];
 941        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 942        int seen;
 943} store;
 944
 945static int matches(const char *key, const char *value)
 946{
 947        return !strcmp(key, store.key) &&
 948                (store.value_regex == NULL ||
 949                 (store.do_not_match ^
 950                  !regexec(store.value_regex, value, 0, NULL, 0)));
 951}
 952
 953static int store_aux(const char *key, const char *value, void *cb)
 954{
 955        const char *ep;
 956        size_t section_len;
 957        FILE *f = cf->f;
 958
 959        switch (store.state) {
 960        case KEY_SEEN:
 961                if (matches(key, value)) {
 962                        if (store.seen == 1 && store.multi_replace == 0) {
 963                                warning("%s has multiple values", key);
 964                        } else if (store.seen >= MAX_MATCHES) {
 965                                error("too many matches for %s", key);
 966                                return 1;
 967                        }
 968
 969                        store.offset[store.seen] = ftell(f);
 970                        store.seen++;
 971                }
 972                break;
 973        case SECTION_SEEN:
 974                /*
 975                 * What we are looking for is in store.key (both
 976                 * section and var), and its section part is baselen
 977                 * long.  We found key (again, both section and var).
 978                 * We would want to know if this key is in the same
 979                 * section as what we are looking for.  We already
 980                 * know we are in the same section as what should
 981                 * hold store.key.
 982                 */
 983                ep = strrchr(key, '.');
 984                section_len = ep - key;
 985
 986                if ((section_len != store.baselen) ||
 987                    memcmp(key, store.key, section_len+1)) {
 988                        store.state = SECTION_END_SEEN;
 989                        break;
 990                }
 991
 992                /*
 993                 * Do not increment matches: this is no match, but we
 994                 * just made sure we are in the desired section.
 995                 */
 996                store.offset[store.seen] = ftell(f);
 997                /* fallthru */
 998        case SECTION_END_SEEN:
 999        case START:
1000                if (matches(key, value)) {
1001                        store.offset[store.seen] = ftell(f);
1002                        store.state = KEY_SEEN;
1003                        store.seen++;
1004                } else {
1005                        if (strrchr(key, '.') - key == store.baselen &&
1006                              !strncmp(key, store.key, store.baselen)) {
1007                                        store.state = SECTION_SEEN;
1008                                        store.offset[store.seen] = ftell(f);
1009                        }
1010                }
1011        }
1012        return 0;
1013}
1014
1015static int write_error(const char *filename)
1016{
1017        error("failed to write new configuration file %s", filename);
1018
1019        /* Same error code as "failed to rename". */
1020        return 4;
1021}
1022
1023static int store_write_section(int fd, const char *key)
1024{
1025        const char *dot;
1026        int i, success;
1027        struct strbuf sb = STRBUF_INIT;
1028
1029        dot = memchr(key, '.', store.baselen);
1030        if (dot) {
1031                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1032                for (i = dot - key + 1; i < store.baselen; i++) {
1033                        if (key[i] == '"' || key[i] == '\\')
1034                                strbuf_addch(&sb, '\\');
1035                        strbuf_addch(&sb, key[i]);
1036                }
1037                strbuf_addstr(&sb, "\"]\n");
1038        } else {
1039                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1040        }
1041
1042        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1043        strbuf_release(&sb);
1044
1045        return success;
1046}
1047
1048static int store_write_pair(int fd, const char *key, const char *value)
1049{
1050        int i, success;
1051        int length = strlen(key + store.baselen + 1);
1052        const char *quote = "";
1053        struct strbuf sb = STRBUF_INIT;
1054
1055        /*
1056         * Check to see if the value needs to be surrounded with a dq pair.
1057         * Note that problematic characters are always backslash-quoted; this
1058         * check is about not losing leading or trailing SP and strings that
1059         * follow beginning-of-comment characters (i.e. ';' and '#') by the
1060         * configuration parser.
1061         */
1062        if (value[0] == ' ')
1063                quote = "\"";
1064        for (i = 0; value[i]; i++)
1065                if (value[i] == ';' || value[i] == '#')
1066                        quote = "\"";
1067        if (i && value[i - 1] == ' ')
1068                quote = "\"";
1069
1070        strbuf_addf(&sb, "\t%.*s = %s",
1071                    length, key + store.baselen + 1, quote);
1072
1073        for (i = 0; value[i]; i++)
1074                switch (value[i]) {
1075                case '\n':
1076                        strbuf_addstr(&sb, "\\n");
1077                        break;
1078                case '\t':
1079                        strbuf_addstr(&sb, "\\t");
1080                        break;
1081                case '"':
1082                case '\\':
1083                        strbuf_addch(&sb, '\\');
1084                default:
1085                        strbuf_addch(&sb, value[i]);
1086                        break;
1087                }
1088        strbuf_addf(&sb, "%s\n", quote);
1089
1090        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1091        strbuf_release(&sb);
1092
1093        return success;
1094}
1095
1096static ssize_t find_beginning_of_line(const char *contents, size_t size,
1097        size_t offset_, int *found_bracket)
1098{
1099        size_t equal_offset = size, bracket_offset = size;
1100        ssize_t offset;
1101
1102contline:
1103        for (offset = offset_-2; offset > 0
1104                        && contents[offset] != '\n'; offset--)
1105                switch (contents[offset]) {
1106                        case '=': equal_offset = offset; break;
1107                        case ']': bracket_offset = offset; break;
1108                }
1109        if (offset > 0 && contents[offset-1] == '\\') {
1110                offset_ = offset;
1111                goto contline;
1112        }
1113        if (bracket_offset < equal_offset) {
1114                *found_bracket = 1;
1115                offset = bracket_offset+1;
1116        } else
1117                offset++;
1118
1119        return offset;
1120}
1121
1122int git_config_set_in_file(const char *config_filename,
1123                        const char *key, const char *value)
1124{
1125        return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1126}
1127
1128int git_config_set(const char *key, const char *value)
1129{
1130        return git_config_set_multivar(key, value, NULL, 0);
1131}
1132
1133/*
1134 * Auxiliary function to sanity-check and split the key into the section
1135 * identifier and variable name.
1136 *
1137 * Returns 0 on success, -1 when there is an invalid character in the key and
1138 * -2 if there is no section name in the key.
1139 *
1140 * store_key - pointer to char* which will hold a copy of the key with
1141 *             lowercase section and variable name
1142 * baselen - pointer to int which will hold the length of the
1143 *           section + subsection part, can be NULL
1144 */
1145int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1146{
1147        int i, dot, baselen;
1148        const char *last_dot = strrchr(key, '.');
1149
1150        /*
1151         * Since "key" actually contains the section name and the real
1152         * key name separated by a dot, we have to know where the dot is.
1153         */
1154
1155        if (last_dot == NULL || last_dot == key) {
1156                error("key does not contain a section: %s", key);
1157                return -CONFIG_NO_SECTION_OR_NAME;
1158        }
1159
1160        if (!last_dot[1]) {
1161                error("key does not contain variable name: %s", key);
1162                return -CONFIG_NO_SECTION_OR_NAME;
1163        }
1164
1165        baselen = last_dot - key;
1166        if (baselen_)
1167                *baselen_ = baselen;
1168
1169        /*
1170         * Validate the key and while at it, lower case it for matching.
1171         */
1172        *store_key = xmalloc(strlen(key) + 1);
1173
1174        dot = 0;
1175        for (i = 0; key[i]; i++) {
1176                unsigned char c = key[i];
1177                if (c == '.')
1178                        dot = 1;
1179                /* Leave the extended basename untouched.. */
1180                if (!dot || i > baselen) {
1181                        if (!iskeychar(c) ||
1182                            (i == baselen + 1 && !isalpha(c))) {
1183                                error("invalid key: %s", key);
1184                                goto out_free_ret_1;
1185                        }
1186                        c = tolower(c);
1187                } else if (c == '\n') {
1188                        error("invalid key (newline): %s", key);
1189                        goto out_free_ret_1;
1190                }
1191                (*store_key)[i] = c;
1192        }
1193        (*store_key)[i] = 0;
1194
1195        return 0;
1196
1197out_free_ret_1:
1198        free(*store_key);
1199        return -CONFIG_INVALID_KEY;
1200}
1201
1202/*
1203 * If value==NULL, unset in (remove from) config,
1204 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1205 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1206 *     else all matching key/values (regardless how many) are removed,
1207 *     before the new pair is written.
1208 *
1209 * Returns 0 on success.
1210 *
1211 * This function does this:
1212 *
1213 * - it locks the config file by creating ".git/config.lock"
1214 *
1215 * - it then parses the config using store_aux() as validator to find
1216 *   the position on the key/value pair to replace. If it is to be unset,
1217 *   it must be found exactly once.
1218 *
1219 * - the config file is mmap()ed and the part before the match (if any) is
1220 *   written to the lock file, then the changed part and the rest.
1221 *
1222 * - the config file is removed and the lock file rename()d to it.
1223 *
1224 */
1225int git_config_set_multivar_in_file(const char *config_filename,
1226                                const char *key, const char *value,
1227                                const char *value_regex, int multi_replace)
1228{
1229        int fd = -1, in_fd;
1230        int ret;
1231        struct lock_file *lock = NULL;
1232
1233        /* parse-key returns negative; flip the sign to feed exit(3) */
1234        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1235        if (ret)
1236                goto out_free;
1237
1238        store.multi_replace = multi_replace;
1239
1240
1241        /*
1242         * The lock serves a purpose in addition to locking: the new
1243         * contents of .git/config will be written into it.
1244         */
1245        lock = xcalloc(sizeof(struct lock_file), 1);
1246        fd = hold_lock_file_for_update(lock, config_filename, 0);
1247        if (fd < 0) {
1248                error("could not lock config file %s: %s", config_filename, strerror(errno));
1249                free(store.key);
1250                ret = CONFIG_NO_LOCK;
1251                goto out_free;
1252        }
1253
1254        /*
1255         * If .git/config does not exist yet, write a minimal version.
1256         */
1257        in_fd = open(config_filename, O_RDONLY);
1258        if ( in_fd < 0 ) {
1259                free(store.key);
1260
1261                if ( ENOENT != errno ) {
1262                        error("opening %s: %s", config_filename,
1263                              strerror(errno));
1264                        ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1265                        goto out_free;
1266                }
1267                /* if nothing to unset, error out */
1268                if (value == NULL) {
1269                        ret = CONFIG_NOTHING_SET;
1270                        goto out_free;
1271                }
1272
1273                store.key = (char *)key;
1274                if (!store_write_section(fd, key) ||
1275                    !store_write_pair(fd, key, value))
1276                        goto write_err_out;
1277        } else {
1278                struct stat st;
1279                char *contents;
1280                size_t contents_sz, copy_begin, copy_end;
1281                int i, new_line = 0;
1282
1283                if (value_regex == NULL)
1284                        store.value_regex = NULL;
1285                else {
1286                        if (value_regex[0] == '!') {
1287                                store.do_not_match = 1;
1288                                value_regex++;
1289                        } else
1290                                store.do_not_match = 0;
1291
1292                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1293                        if (regcomp(store.value_regex, value_regex,
1294                                        REG_EXTENDED)) {
1295                                error("invalid pattern: %s", value_regex);
1296                                free(store.value_regex);
1297                                ret = CONFIG_INVALID_PATTERN;
1298                                goto out_free;
1299                        }
1300                }
1301
1302                store.offset[0] = 0;
1303                store.state = START;
1304                store.seen = 0;
1305
1306                /*
1307                 * After this, store.offset will contain the *end* offset
1308                 * of the last match, or remain at 0 if no match was found.
1309                 * As a side effect, we make sure to transform only a valid
1310                 * existing config file.
1311                 */
1312                if (git_config_from_file(store_aux, config_filename, NULL)) {
1313                        error("invalid config file %s", config_filename);
1314                        free(store.key);
1315                        if (store.value_regex != NULL) {
1316                                regfree(store.value_regex);
1317                                free(store.value_regex);
1318                        }
1319                        ret = CONFIG_INVALID_FILE;
1320                        goto out_free;
1321                }
1322
1323                free(store.key);
1324                if (store.value_regex != NULL) {
1325                        regfree(store.value_regex);
1326                        free(store.value_regex);
1327                }
1328
1329                /* if nothing to unset, or too many matches, error out */
1330                if ((store.seen == 0 && value == NULL) ||
1331                                (store.seen > 1 && multi_replace == 0)) {
1332                        ret = CONFIG_NOTHING_SET;
1333                        goto out_free;
1334                }
1335
1336                fstat(in_fd, &st);
1337                contents_sz = xsize_t(st.st_size);
1338                contents = xmmap(NULL, contents_sz, PROT_READ,
1339                        MAP_PRIVATE, in_fd, 0);
1340                close(in_fd);
1341
1342                if (store.seen == 0)
1343                        store.seen = 1;
1344
1345                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1346                        if (store.offset[i] == 0) {
1347                                store.offset[i] = copy_end = contents_sz;
1348                        } else if (store.state != KEY_SEEN) {
1349                                copy_end = store.offset[i];
1350                        } else
1351                                copy_end = find_beginning_of_line(
1352                                        contents, contents_sz,
1353                                        store.offset[i]-2, &new_line);
1354
1355                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1356                                new_line = 1;
1357
1358                        /* write the first part of the config */
1359                        if (copy_end > copy_begin) {
1360                                if (write_in_full(fd, contents + copy_begin,
1361                                                  copy_end - copy_begin) <
1362                                    copy_end - copy_begin)
1363                                        goto write_err_out;
1364                                if (new_line &&
1365                                    write_str_in_full(fd, "\n") != 1)
1366                                        goto write_err_out;
1367                        }
1368                        copy_begin = store.offset[i];
1369                }
1370
1371                /* write the pair (value == NULL means unset) */
1372                if (value != NULL) {
1373                        if (store.state == START) {
1374                                if (!store_write_section(fd, key))
1375                                        goto write_err_out;
1376                        }
1377                        if (!store_write_pair(fd, key, value))
1378                                goto write_err_out;
1379                }
1380
1381                /* write the rest of the config */
1382                if (copy_begin < contents_sz)
1383                        if (write_in_full(fd, contents + copy_begin,
1384                                          contents_sz - copy_begin) <
1385                            contents_sz - copy_begin)
1386                                goto write_err_out;
1387
1388                munmap(contents, contents_sz);
1389        }
1390
1391        if (commit_lock_file(lock) < 0) {
1392                error("could not commit config file %s", config_filename);
1393                ret = CONFIG_NO_WRITE;
1394                goto out_free;
1395        }
1396
1397        /*
1398         * lock is committed, so don't try to roll it back below.
1399         * NOTE: Since lockfile.c keeps a linked list of all created
1400         * lock_file structures, it isn't safe to free(lock).  It's
1401         * better to just leave it hanging around.
1402         */
1403        lock = NULL;
1404        ret = 0;
1405
1406out_free:
1407        if (lock)
1408                rollback_lock_file(lock);
1409        return ret;
1410
1411write_err_out:
1412        ret = write_error(lock->filename);
1413        goto out_free;
1414
1415}
1416
1417int git_config_set_multivar(const char *key, const char *value,
1418                        const char *value_regex, int multi_replace)
1419{
1420        const char *config_filename;
1421        char *buf = NULL;
1422        int ret;
1423
1424        if (config_exclusive_filename)
1425                config_filename = config_exclusive_filename;
1426        else
1427                config_filename = buf = git_pathdup("config");
1428
1429        ret = git_config_set_multivar_in_file(config_filename, key, value,
1430                                        value_regex, multi_replace);
1431        free(buf);
1432        return ret;
1433}
1434
1435static int section_name_match (const char *buf, const char *name)
1436{
1437        int i = 0, j = 0, dot = 0;
1438        if (buf[i] != '[')
1439                return 0;
1440        for (i = 1; buf[i] && buf[i] != ']'; i++) {
1441                if (!dot && isspace(buf[i])) {
1442                        dot = 1;
1443                        if (name[j++] != '.')
1444                                break;
1445                        for (i++; isspace(buf[i]); i++)
1446                                ; /* do nothing */
1447                        if (buf[i] != '"')
1448                                break;
1449                        continue;
1450                }
1451                if (buf[i] == '\\' && dot)
1452                        i++;
1453                else if (buf[i] == '"' && dot) {
1454                        for (i++; isspace(buf[i]); i++)
1455                                ; /* do_nothing */
1456                        break;
1457                }
1458                if (buf[i] != name[j++])
1459                        break;
1460        }
1461        if (buf[i] == ']' && name[j] == 0) {
1462                /*
1463                 * We match, now just find the right length offset by
1464                 * gobbling up any whitespace after it, as well
1465                 */
1466                i++;
1467                for (; buf[i] && isspace(buf[i]); i++)
1468                        ; /* do nothing */
1469                return i;
1470        }
1471        return 0;
1472}
1473
1474/* if new_name == NULL, the section is removed instead */
1475int git_config_rename_section(const char *old_name, const char *new_name)
1476{
1477        int ret = 0, remove = 0;
1478        char *config_filename;
1479        struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1480        int out_fd;
1481        char buf[1024];
1482        FILE *config_file;
1483
1484        if (config_exclusive_filename)
1485                config_filename = xstrdup(config_exclusive_filename);
1486        else
1487                config_filename = git_pathdup("config");
1488        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1489        if (out_fd < 0) {
1490                ret = error("could not lock config file %s", config_filename);
1491                goto out;
1492        }
1493
1494        if (!(config_file = fopen(config_filename, "rb"))) {
1495                /* no config file means nothing to rename, no error */
1496                goto unlock_and_out;
1497        }
1498
1499        while (fgets(buf, sizeof(buf), config_file)) {
1500                int i;
1501                int length;
1502                char *output = buf;
1503                for (i = 0; buf[i] && isspace(buf[i]); i++)
1504                        ; /* do nothing */
1505                if (buf[i] == '[') {
1506                        /* it's a section */
1507                        int offset = section_name_match(&buf[i], old_name);
1508                        if (offset > 0) {
1509                                ret++;
1510                                if (new_name == NULL) {
1511                                        remove = 1;
1512                                        continue;
1513                                }
1514                                store.baselen = strlen(new_name);
1515                                if (!store_write_section(out_fd, new_name)) {
1516                                        ret = write_error(lock->filename);
1517                                        goto out;
1518                                }
1519                                /*
1520                                 * We wrote out the new section, with
1521                                 * a newline, now skip the old
1522                                 * section's length
1523                                 */
1524                                output += offset + i;
1525                                if (strlen(output) > 0) {
1526                                        /*
1527                                         * More content means there's
1528                                         * a declaration to put on the
1529                                         * next line; indent with a
1530                                         * tab
1531                                         */
1532                                        output -= 1;
1533                                        output[0] = '\t';
1534                                }
1535                        }
1536                        remove = 0;
1537                }
1538                if (remove)
1539                        continue;
1540                length = strlen(output);
1541                if (write_in_full(out_fd, output, length) != length) {
1542                        ret = write_error(lock->filename);
1543                        goto out;
1544                }
1545        }
1546        fclose(config_file);
1547unlock_and_out:
1548        if (commit_lock_file(lock) < 0)
1549                ret = error("could not commit config file %s", config_filename);
1550out:
1551        free(config_filename);
1552        return ret;
1553}
1554
1555/*
1556 * Call this to report error for your variable that should not
1557 * get a boolean value (i.e. "[my] var" means "true").
1558 */
1559int config_error_nonbool(const char *var)
1560{
1561        return error("Missing value for '%s'", var);
1562}