config.con commit grep: break down an "if" stmt in preparation for next changes (60452a3)
   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 "lockfile.h"
  10#include "exec_cmd.h"
  11#include "strbuf.h"
  12#include "quote.h"
  13#include "hashmap.h"
  14#include "string-list.h"
  15#include "utf8.h"
  16
  17struct config_source {
  18        struct config_source *prev;
  19        union {
  20                FILE *file;
  21                struct config_buf {
  22                        const char *buf;
  23                        size_t len;
  24                        size_t pos;
  25                } buf;
  26        } u;
  27        const char *name;
  28        const char *path;
  29        int die_on_error;
  30        int linenr;
  31        int eof;
  32        struct strbuf value;
  33        struct strbuf var;
  34
  35        int (*do_fgetc)(struct config_source *c);
  36        int (*do_ungetc)(int c, struct config_source *conf);
  37        long (*do_ftell)(struct config_source *c);
  38};
  39
  40static struct config_source *cf;
  41
  42static int zlib_compression_seen;
  43
  44/*
  45 * Default config_set that contains key-value pairs from the usual set of config
  46 * config files (i.e repo specific .git/config, user wide ~/.gitconfig, XDG
  47 * config file and the global /etc/gitconfig)
  48 */
  49static struct config_set the_config_set;
  50
  51static int config_file_fgetc(struct config_source *conf)
  52{
  53        return getc_unlocked(conf->u.file);
  54}
  55
  56static int config_file_ungetc(int c, struct config_source *conf)
  57{
  58        return ungetc(c, conf->u.file);
  59}
  60
  61static long config_file_ftell(struct config_source *conf)
  62{
  63        return ftell(conf->u.file);
  64}
  65
  66
  67static int config_buf_fgetc(struct config_source *conf)
  68{
  69        if (conf->u.buf.pos < conf->u.buf.len)
  70                return conf->u.buf.buf[conf->u.buf.pos++];
  71
  72        return EOF;
  73}
  74
  75static int config_buf_ungetc(int c, struct config_source *conf)
  76{
  77        if (conf->u.buf.pos > 0) {
  78                conf->u.buf.pos--;
  79                if (conf->u.buf.buf[conf->u.buf.pos] != c)
  80                        die("BUG: config_buf can only ungetc the same character");
  81                return c;
  82        }
  83
  84        return EOF;
  85}
  86
  87static long config_buf_ftell(struct config_source *conf)
  88{
  89        return conf->u.buf.pos;
  90}
  91
  92#define MAX_INCLUDE_DEPTH 10
  93static const char include_depth_advice[] =
  94"exceeded maximum include depth (%d) while including\n"
  95"       %s\n"
  96"from\n"
  97"       %s\n"
  98"Do you have circular includes?";
  99static int handle_path_include(const char *path, struct config_include_data *inc)
 100{
 101        int ret = 0;
 102        struct strbuf buf = STRBUF_INIT;
 103        char *expanded;
 104
 105        if (!path)
 106                return config_error_nonbool("include.path");
 107
 108        expanded = expand_user_path(path);
 109        if (!expanded)
 110                return error("Could not expand include path '%s'", path);
 111        path = expanded;
 112
 113        /*
 114         * Use an absolute path as-is, but interpret relative paths
 115         * based on the including config file.
 116         */
 117        if (!is_absolute_path(path)) {
 118                char *slash;
 119
 120                if (!cf || !cf->path)
 121                        return error("relative config includes must come from files");
 122
 123                slash = find_last_dir_sep(cf->path);
 124                if (slash)
 125                        strbuf_add(&buf, cf->path, slash - cf->path + 1);
 126                strbuf_addstr(&buf, path);
 127                path = buf.buf;
 128        }
 129
 130        if (!access_or_die(path, R_OK, 0)) {
 131                if (++inc->depth > MAX_INCLUDE_DEPTH)
 132                        die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
 133                            cf && cf->name ? cf->name : "the command line");
 134                ret = git_config_from_file(git_config_include, path, inc);
 135                inc->depth--;
 136        }
 137        strbuf_release(&buf);
 138        free(expanded);
 139        return ret;
 140}
 141
 142int git_config_include(const char *var, const char *value, void *data)
 143{
 144        struct config_include_data *inc = data;
 145        int ret;
 146
 147        /*
 148         * Pass along all values, including "include" directives; this makes it
 149         * possible to query information on the includes themselves.
 150         */
 151        ret = inc->fn(var, value, inc->data);
 152        if (ret < 0)
 153                return ret;
 154
 155        if (!strcmp(var, "include.path"))
 156                ret = handle_path_include(value, inc);
 157        return ret;
 158}
 159
 160void git_config_push_parameter(const char *text)
 161{
 162        struct strbuf env = STRBUF_INIT;
 163        const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
 164        if (old) {
 165                strbuf_addstr(&env, old);
 166                strbuf_addch(&env, ' ');
 167        }
 168        sq_quote_buf(&env, text);
 169        setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
 170        strbuf_release(&env);
 171}
 172
 173int git_config_parse_parameter(const char *text,
 174                               config_fn_t fn, void *data)
 175{
 176        const char *value;
 177        struct strbuf **pair;
 178
 179        pair = strbuf_split_str(text, '=', 2);
 180        if (!pair[0])
 181                return error("bogus config parameter: %s", text);
 182
 183        if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=') {
 184                strbuf_setlen(pair[0], pair[0]->len - 1);
 185                value = pair[1] ? pair[1]->buf : "";
 186        } else {
 187                value = NULL;
 188        }
 189
 190        strbuf_trim(pair[0]);
 191        if (!pair[0]->len) {
 192                strbuf_list_free(pair);
 193                return error("bogus config parameter: %s", text);
 194        }
 195        strbuf_tolower(pair[0]);
 196        if (fn(pair[0]->buf, value, data) < 0) {
 197                strbuf_list_free(pair);
 198                return -1;
 199        }
 200        strbuf_list_free(pair);
 201        return 0;
 202}
 203
 204int git_config_from_parameters(config_fn_t fn, void *data)
 205{
 206        const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 207        char *envw;
 208        const char **argv = NULL;
 209        int nr = 0, alloc = 0;
 210        int i;
 211
 212        if (!env)
 213                return 0;
 214        /* sq_dequote will write over it */
 215        envw = xstrdup(env);
 216
 217        if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 218                free(envw);
 219                return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
 220        }
 221
 222        for (i = 0; i < nr; i++) {
 223                if (git_config_parse_parameter(argv[i], fn, data) < 0) {
 224                        free(argv);
 225                        free(envw);
 226                        return -1;
 227                }
 228        }
 229
 230        free(argv);
 231        free(envw);
 232        return nr > 0;
 233}
 234
 235static int get_next_char(void)
 236{
 237        int c = cf->do_fgetc(cf);
 238
 239        if (c == '\r') {
 240                /* DOS like systems */
 241                c = cf->do_fgetc(cf);
 242                if (c != '\n') {
 243                        if (c != EOF)
 244                                cf->do_ungetc(c, cf);
 245                        c = '\r';
 246                }
 247        }
 248        if (c == '\n')
 249                cf->linenr++;
 250        if (c == EOF) {
 251                cf->eof = 1;
 252                cf->linenr++;
 253                c = '\n';
 254        }
 255        return c;
 256}
 257
 258static char *parse_value(void)
 259{
 260        int quote = 0, comment = 0, space = 0;
 261
 262        strbuf_reset(&cf->value);
 263        for (;;) {
 264                int c = get_next_char();
 265                if (c == '\n') {
 266                        if (quote) {
 267                                cf->linenr--;
 268                                return NULL;
 269                        }
 270                        return cf->value.buf;
 271                }
 272                if (comment)
 273                        continue;
 274                if (isspace(c) && !quote) {
 275                        if (cf->value.len)
 276                                space++;
 277                        continue;
 278                }
 279                if (!quote) {
 280                        if (c == ';' || c == '#') {
 281                                comment = 1;
 282                                continue;
 283                        }
 284                }
 285                for (; space; space--)
 286                        strbuf_addch(&cf->value, ' ');
 287                if (c == '\\') {
 288                        c = get_next_char();
 289                        switch (c) {
 290                        case '\n':
 291                                continue;
 292                        case 't':
 293                                c = '\t';
 294                                break;
 295                        case 'b':
 296                                c = '\b';
 297                                break;
 298                        case 'n':
 299                                c = '\n';
 300                                break;
 301                        /* Some characters escape as themselves */
 302                        case '\\': case '"':
 303                                break;
 304                        /* Reject unknown escape sequences */
 305                        default:
 306                                return NULL;
 307                        }
 308                        strbuf_addch(&cf->value, c);
 309                        continue;
 310                }
 311                if (c == '"') {
 312                        quote = 1-quote;
 313                        continue;
 314                }
 315                strbuf_addch(&cf->value, c);
 316        }
 317}
 318
 319static inline int iskeychar(int c)
 320{
 321        return isalnum(c) || c == '-';
 322}
 323
 324static int get_value(config_fn_t fn, void *data, struct strbuf *name)
 325{
 326        int c;
 327        char *value;
 328        int ret;
 329
 330        /* Get the full name */
 331        for (;;) {
 332                c = get_next_char();
 333                if (cf->eof)
 334                        break;
 335                if (!iskeychar(c))
 336                        break;
 337                strbuf_addch(name, tolower(c));
 338        }
 339
 340        while (c == ' ' || c == '\t')
 341                c = get_next_char();
 342
 343        value = NULL;
 344        if (c != '\n') {
 345                if (c != '=')
 346                        return -1;
 347                value = parse_value();
 348                if (!value)
 349                        return -1;
 350        }
 351        /*
 352         * We already consumed the \n, but we need linenr to point to
 353         * the line we just parsed during the call to fn to get
 354         * accurate line number in error messages.
 355         */
 356        cf->linenr--;
 357        ret = fn(name->buf, value, data);
 358        cf->linenr++;
 359        return ret;
 360}
 361
 362static int get_extended_base_var(struct strbuf *name, int c)
 363{
 364        do {
 365                if (c == '\n')
 366                        goto error_incomplete_line;
 367                c = get_next_char();
 368        } while (isspace(c));
 369
 370        /* We require the format to be '[base "extension"]' */
 371        if (c != '"')
 372                return -1;
 373        strbuf_addch(name, '.');
 374
 375        for (;;) {
 376                int c = get_next_char();
 377                if (c == '\n')
 378                        goto error_incomplete_line;
 379                if (c == '"')
 380                        break;
 381                if (c == '\\') {
 382                        c = get_next_char();
 383                        if (c == '\n')
 384                                goto error_incomplete_line;
 385                }
 386                strbuf_addch(name, c);
 387        }
 388
 389        /* Final ']' */
 390        if (get_next_char() != ']')
 391                return -1;
 392        return 0;
 393error_incomplete_line:
 394        cf->linenr--;
 395        return -1;
 396}
 397
 398static int get_base_var(struct strbuf *name)
 399{
 400        for (;;) {
 401                int c = get_next_char();
 402                if (cf->eof)
 403                        return -1;
 404                if (c == ']')
 405                        return 0;
 406                if (isspace(c))
 407                        return get_extended_base_var(name, c);
 408                if (!iskeychar(c) && c != '.')
 409                        return -1;
 410                strbuf_addch(name, tolower(c));
 411        }
 412}
 413
 414static int git_parse_source(config_fn_t fn, void *data)
 415{
 416        int comment = 0;
 417        int baselen = 0;
 418        struct strbuf *var = &cf->var;
 419
 420        /* U+FEFF Byte Order Mark in UTF8 */
 421        const char *bomptr = utf8_bom;
 422
 423        for (;;) {
 424                int c = get_next_char();
 425                if (bomptr && *bomptr) {
 426                        /* We are at the file beginning; skip UTF8-encoded BOM
 427                         * if present. Sane editors won't put this in on their
 428                         * own, but e.g. Windows Notepad will do it happily. */
 429                        if (c == (*bomptr & 0377)) {
 430                                bomptr++;
 431                                continue;
 432                        } else {
 433                                /* Do not tolerate partial BOM. */
 434                                if (bomptr != utf8_bom)
 435                                        break;
 436                                /* No BOM at file beginning. Cool. */
 437                                bomptr = NULL;
 438                        }
 439                }
 440                if (c == '\n') {
 441                        if (cf->eof)
 442                                return 0;
 443                        comment = 0;
 444                        continue;
 445                }
 446                if (comment || isspace(c))
 447                        continue;
 448                if (c == '#' || c == ';') {
 449                        comment = 1;
 450                        continue;
 451                }
 452                if (c == '[') {
 453                        /* Reset prior to determining a new stem */
 454                        strbuf_reset(var);
 455                        if (get_base_var(var) < 0 || var->len < 1)
 456                                break;
 457                        strbuf_addch(var, '.');
 458                        baselen = var->len;
 459                        continue;
 460                }
 461                if (!isalpha(c))
 462                        break;
 463                /*
 464                 * Truncate the var name back to the section header
 465                 * stem prior to grabbing the suffix part of the name
 466                 * and the value.
 467                 */
 468                strbuf_setlen(var, baselen);
 469                strbuf_addch(var, tolower(c));
 470                if (get_value(fn, data, var) < 0)
 471                        break;
 472        }
 473        if (cf->die_on_error)
 474                die(_("bad config file line %d in %s"), cf->linenr, cf->name);
 475        else
 476                return error(_("bad config file line %d in %s"), cf->linenr, cf->name);
 477}
 478
 479static int parse_unit_factor(const char *end, uintmax_t *val)
 480{
 481        if (!*end)
 482                return 1;
 483        else if (!strcasecmp(end, "k")) {
 484                *val *= 1024;
 485                return 1;
 486        }
 487        else if (!strcasecmp(end, "m")) {
 488                *val *= 1024 * 1024;
 489                return 1;
 490        }
 491        else if (!strcasecmp(end, "g")) {
 492                *val *= 1024 * 1024 * 1024;
 493                return 1;
 494        }
 495        return 0;
 496}
 497
 498static int git_parse_signed(const char *value, intmax_t *ret, intmax_t max)
 499{
 500        if (value && *value) {
 501                char *end;
 502                intmax_t val;
 503                uintmax_t uval;
 504                uintmax_t factor = 1;
 505
 506                errno = 0;
 507                val = strtoimax(value, &end, 0);
 508                if (errno == ERANGE)
 509                        return 0;
 510                if (!parse_unit_factor(end, &factor)) {
 511                        errno = EINVAL;
 512                        return 0;
 513                }
 514                uval = labs(val);
 515                uval *= factor;
 516                if (uval > max || labs(val) > uval) {
 517                        errno = ERANGE;
 518                        return 0;
 519                }
 520                val *= factor;
 521                *ret = val;
 522                return 1;
 523        }
 524        errno = EINVAL;
 525        return 0;
 526}
 527
 528static int git_parse_unsigned(const char *value, uintmax_t *ret, uintmax_t max)
 529{
 530        if (value && *value) {
 531                char *end;
 532                uintmax_t val;
 533                uintmax_t oldval;
 534
 535                errno = 0;
 536                val = strtoumax(value, &end, 0);
 537                if (errno == ERANGE)
 538                        return 0;
 539                oldval = val;
 540                if (!parse_unit_factor(end, &val)) {
 541                        errno = EINVAL;
 542                        return 0;
 543                }
 544                if (val > max || oldval > val) {
 545                        errno = ERANGE;
 546                        return 0;
 547                }
 548                *ret = val;
 549                return 1;
 550        }
 551        errno = EINVAL;
 552        return 0;
 553}
 554
 555static int git_parse_int(const char *value, int *ret)
 556{
 557        intmax_t tmp;
 558        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int)))
 559                return 0;
 560        *ret = tmp;
 561        return 1;
 562}
 563
 564static int git_parse_int64(const char *value, int64_t *ret)
 565{
 566        intmax_t tmp;
 567        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int64_t)))
 568                return 0;
 569        *ret = tmp;
 570        return 1;
 571}
 572
 573int git_parse_ulong(const char *value, unsigned long *ret)
 574{
 575        uintmax_t tmp;
 576        if (!git_parse_unsigned(value, &tmp, maximum_unsigned_value_of_type(long)))
 577                return 0;
 578        *ret = tmp;
 579        return 1;
 580}
 581
 582NORETURN
 583static void die_bad_number(const char *name, const char *value)
 584{
 585        const char *reason = errno == ERANGE ?
 586                             "out of range" :
 587                             "invalid unit";
 588        if (!value)
 589                value = "";
 590
 591        if (cf && cf->name)
 592                die(_("bad numeric config value '%s' for '%s' in %s: %s"),
 593                    value, name, cf->name, reason);
 594        die(_("bad numeric config value '%s' for '%s': %s"), value, name, reason);
 595}
 596
 597int git_config_int(const char *name, const char *value)
 598{
 599        int ret;
 600        if (!git_parse_int(value, &ret))
 601                die_bad_number(name, value);
 602        return ret;
 603}
 604
 605int64_t git_config_int64(const char *name, const char *value)
 606{
 607        int64_t ret;
 608        if (!git_parse_int64(value, &ret))
 609                die_bad_number(name, value);
 610        return ret;
 611}
 612
 613unsigned long git_config_ulong(const char *name, const char *value)
 614{
 615        unsigned long ret;
 616        if (!git_parse_ulong(value, &ret))
 617                die_bad_number(name, value);
 618        return ret;
 619}
 620
 621int git_parse_maybe_bool(const char *value)
 622{
 623        if (!value)
 624                return 1;
 625        if (!*value)
 626                return 0;
 627        if (!strcasecmp(value, "true")
 628            || !strcasecmp(value, "yes")
 629            || !strcasecmp(value, "on"))
 630                return 1;
 631        if (!strcasecmp(value, "false")
 632            || !strcasecmp(value, "no")
 633            || !strcasecmp(value, "off"))
 634                return 0;
 635        return -1;
 636}
 637
 638int git_config_maybe_bool(const char *name, const char *value)
 639{
 640        int v = git_parse_maybe_bool(value);
 641        if (0 <= v)
 642                return v;
 643        if (git_parse_int(value, &v))
 644                return !!v;
 645        return -1;
 646}
 647
 648int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 649{
 650        int v = git_parse_maybe_bool(value);
 651        if (0 <= v) {
 652                *is_bool = 1;
 653                return v;
 654        }
 655        *is_bool = 0;
 656        return git_config_int(name, value);
 657}
 658
 659int git_config_bool(const char *name, const char *value)
 660{
 661        int discard;
 662        return !!git_config_bool_or_int(name, value, &discard);
 663}
 664
 665int git_config_string(const char **dest, const char *var, const char *value)
 666{
 667        if (!value)
 668                return config_error_nonbool(var);
 669        *dest = xstrdup(value);
 670        return 0;
 671}
 672
 673int git_config_pathname(const char **dest, const char *var, const char *value)
 674{
 675        if (!value)
 676                return config_error_nonbool(var);
 677        *dest = expand_user_path(value);
 678        if (!*dest)
 679                die(_("failed to expand user dir in: '%s'"), value);
 680        return 0;
 681}
 682
 683static int git_default_core_config(const char *var, const char *value)
 684{
 685        /* This needs a better name */
 686        if (!strcmp(var, "core.filemode")) {
 687                trust_executable_bit = git_config_bool(var, value);
 688                return 0;
 689        }
 690        if (!strcmp(var, "core.trustctime")) {
 691                trust_ctime = git_config_bool(var, value);
 692                return 0;
 693        }
 694        if (!strcmp(var, "core.checkstat")) {
 695                if (!strcasecmp(value, "default"))
 696                        check_stat = 1;
 697                else if (!strcasecmp(value, "minimal"))
 698                        check_stat = 0;
 699        }
 700
 701        if (!strcmp(var, "core.quotepath")) {
 702                quote_path_fully = git_config_bool(var, value);
 703                return 0;
 704        }
 705
 706        if (!strcmp(var, "core.symlinks")) {
 707                has_symlinks = git_config_bool(var, value);
 708                return 0;
 709        }
 710
 711        if (!strcmp(var, "core.ignorecase")) {
 712                ignore_case = git_config_bool(var, value);
 713                return 0;
 714        }
 715
 716        if (!strcmp(var, "core.attributesfile"))
 717                return git_config_pathname(&git_attributes_file, var, value);
 718
 719        if (!strcmp(var, "core.bare")) {
 720                is_bare_repository_cfg = git_config_bool(var, value);
 721                return 0;
 722        }
 723
 724        if (!strcmp(var, "core.ignorestat")) {
 725                assume_unchanged = git_config_bool(var, value);
 726                return 0;
 727        }
 728
 729        if (!strcmp(var, "core.prefersymlinkrefs")) {
 730                prefer_symlink_refs = git_config_bool(var, value);
 731                return 0;
 732        }
 733
 734        if (!strcmp(var, "core.logallrefupdates")) {
 735                log_all_ref_updates = git_config_bool(var, value);
 736                return 0;
 737        }
 738
 739        if (!strcmp(var, "core.warnambiguousrefs")) {
 740                warn_ambiguous_refs = git_config_bool(var, value);
 741                return 0;
 742        }
 743
 744        if (!strcmp(var, "core.abbrev")) {
 745                int abbrev = git_config_int(var, value);
 746                if (abbrev < minimum_abbrev || abbrev > 40)
 747                        return -1;
 748                default_abbrev = abbrev;
 749                return 0;
 750        }
 751
 752        if (!strcmp(var, "core.loosecompression")) {
 753                int level = git_config_int(var, value);
 754                if (level == -1)
 755                        level = Z_DEFAULT_COMPRESSION;
 756                else if (level < 0 || level > Z_BEST_COMPRESSION)
 757                        die(_("bad zlib compression level %d"), level);
 758                zlib_compression_level = level;
 759                zlib_compression_seen = 1;
 760                return 0;
 761        }
 762
 763        if (!strcmp(var, "core.compression")) {
 764                int level = git_config_int(var, value);
 765                if (level == -1)
 766                        level = Z_DEFAULT_COMPRESSION;
 767                else if (level < 0 || level > Z_BEST_COMPRESSION)
 768                        die(_("bad zlib compression level %d"), level);
 769                core_compression_level = level;
 770                core_compression_seen = 1;
 771                if (!zlib_compression_seen)
 772                        zlib_compression_level = level;
 773                return 0;
 774        }
 775
 776        if (!strcmp(var, "core.packedgitwindowsize")) {
 777                int pgsz_x2 = getpagesize() * 2;
 778                packed_git_window_size = git_config_ulong(var, value);
 779
 780                /* This value must be multiple of (pagesize * 2) */
 781                packed_git_window_size /= pgsz_x2;
 782                if (packed_git_window_size < 1)
 783                        packed_git_window_size = 1;
 784                packed_git_window_size *= pgsz_x2;
 785                return 0;
 786        }
 787
 788        if (!strcmp(var, "core.bigfilethreshold")) {
 789                big_file_threshold = git_config_ulong(var, value);
 790                return 0;
 791        }
 792
 793        if (!strcmp(var, "core.packedgitlimit")) {
 794                packed_git_limit = git_config_ulong(var, value);
 795                return 0;
 796        }
 797
 798        if (!strcmp(var, "core.deltabasecachelimit")) {
 799                delta_base_cache_limit = git_config_ulong(var, value);
 800                return 0;
 801        }
 802
 803        if (!strcmp(var, "core.autocrlf")) {
 804                if (value && !strcasecmp(value, "input")) {
 805                        if (core_eol == EOL_CRLF)
 806                                return error("core.autocrlf=input conflicts with core.eol=crlf");
 807                        auto_crlf = AUTO_CRLF_INPUT;
 808                        return 0;
 809                }
 810                auto_crlf = git_config_bool(var, value);
 811                return 0;
 812        }
 813
 814        if (!strcmp(var, "core.safecrlf")) {
 815                if (value && !strcasecmp(value, "warn")) {
 816                        safe_crlf = SAFE_CRLF_WARN;
 817                        return 0;
 818                }
 819                safe_crlf = git_config_bool(var, value);
 820                return 0;
 821        }
 822
 823        if (!strcmp(var, "core.eol")) {
 824                if (value && !strcasecmp(value, "lf"))
 825                        core_eol = EOL_LF;
 826                else if (value && !strcasecmp(value, "crlf"))
 827                        core_eol = EOL_CRLF;
 828                else if (value && !strcasecmp(value, "native"))
 829                        core_eol = EOL_NATIVE;
 830                else
 831                        core_eol = EOL_UNSET;
 832                if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 833                        return error("core.autocrlf=input conflicts with core.eol=crlf");
 834                return 0;
 835        }
 836
 837        if (!strcmp(var, "core.notesref")) {
 838                notes_ref_name = xstrdup(value);
 839                return 0;
 840        }
 841
 842        if (!strcmp(var, "core.pager"))
 843                return git_config_string(&pager_program, var, value);
 844
 845        if (!strcmp(var, "core.editor"))
 846                return git_config_string(&editor_program, var, value);
 847
 848        if (!strcmp(var, "core.commentchar")) {
 849                if (!value)
 850                        return config_error_nonbool(var);
 851                else if (!strcasecmp(value, "auto"))
 852                        auto_comment_line_char = 1;
 853                else if (value[0] && !value[1]) {
 854                        comment_line_char = value[0];
 855                        auto_comment_line_char = 0;
 856                } else
 857                        return error("core.commentChar should only be one character");
 858                return 0;
 859        }
 860
 861        if (!strcmp(var, "core.askpass"))
 862                return git_config_string(&askpass_program, var, value);
 863
 864        if (!strcmp(var, "core.excludesfile"))
 865                return git_config_pathname(&excludes_file, var, value);
 866
 867        if (!strcmp(var, "core.whitespace")) {
 868                if (!value)
 869                        return config_error_nonbool(var);
 870                whitespace_rule_cfg = parse_whitespace_rule(value);
 871                return 0;
 872        }
 873
 874        if (!strcmp(var, "core.fsyncobjectfiles")) {
 875                fsync_object_files = git_config_bool(var, value);
 876                return 0;
 877        }
 878
 879        if (!strcmp(var, "core.preloadindex")) {
 880                core_preload_index = git_config_bool(var, value);
 881                return 0;
 882        }
 883
 884        if (!strcmp(var, "core.createobject")) {
 885                if (!strcmp(value, "rename"))
 886                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 887                else if (!strcmp(value, "link"))
 888                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 889                else
 890                        die(_("invalid mode for object creation: %s"), value);
 891                return 0;
 892        }
 893
 894        if (!strcmp(var, "core.sparsecheckout")) {
 895                core_apply_sparse_checkout = git_config_bool(var, value);
 896                return 0;
 897        }
 898
 899        if (!strcmp(var, "core.precomposeunicode")) {
 900                precomposed_unicode = git_config_bool(var, value);
 901                return 0;
 902        }
 903
 904        if (!strcmp(var, "core.protecthfs")) {
 905                protect_hfs = git_config_bool(var, value);
 906                return 0;
 907        }
 908
 909        if (!strcmp(var, "core.protectntfs")) {
 910                protect_ntfs = git_config_bool(var, value);
 911                return 0;
 912        }
 913
 914        /* Add other config variables here and to Documentation/config.txt. */
 915        return 0;
 916}
 917
 918static int git_default_i18n_config(const char *var, const char *value)
 919{
 920        if (!strcmp(var, "i18n.commitencoding"))
 921                return git_config_string(&git_commit_encoding, var, value);
 922
 923        if (!strcmp(var, "i18n.logoutputencoding"))
 924                return git_config_string(&git_log_output_encoding, var, value);
 925
 926        /* Add other config variables here and to Documentation/config.txt. */
 927        return 0;
 928}
 929
 930static int git_default_branch_config(const char *var, const char *value)
 931{
 932        if (!strcmp(var, "branch.autosetupmerge")) {
 933                if (value && !strcasecmp(value, "always")) {
 934                        git_branch_track = BRANCH_TRACK_ALWAYS;
 935                        return 0;
 936                }
 937                git_branch_track = git_config_bool(var, value);
 938                return 0;
 939        }
 940        if (!strcmp(var, "branch.autosetuprebase")) {
 941                if (!value)
 942                        return config_error_nonbool(var);
 943                else if (!strcmp(value, "never"))
 944                        autorebase = AUTOREBASE_NEVER;
 945                else if (!strcmp(value, "local"))
 946                        autorebase = AUTOREBASE_LOCAL;
 947                else if (!strcmp(value, "remote"))
 948                        autorebase = AUTOREBASE_REMOTE;
 949                else if (!strcmp(value, "always"))
 950                        autorebase = AUTOREBASE_ALWAYS;
 951                else
 952                        return error("Malformed value for %s", var);
 953                return 0;
 954        }
 955
 956        /* Add other config variables here and to Documentation/config.txt. */
 957        return 0;
 958}
 959
 960static int git_default_push_config(const char *var, const char *value)
 961{
 962        if (!strcmp(var, "push.default")) {
 963                if (!value)
 964                        return config_error_nonbool(var);
 965                else if (!strcmp(value, "nothing"))
 966                        push_default = PUSH_DEFAULT_NOTHING;
 967                else if (!strcmp(value, "matching"))
 968                        push_default = PUSH_DEFAULT_MATCHING;
 969                else if (!strcmp(value, "simple"))
 970                        push_default = PUSH_DEFAULT_SIMPLE;
 971                else if (!strcmp(value, "upstream"))
 972                        push_default = PUSH_DEFAULT_UPSTREAM;
 973                else if (!strcmp(value, "tracking")) /* deprecated */
 974                        push_default = PUSH_DEFAULT_UPSTREAM;
 975                else if (!strcmp(value, "current"))
 976                        push_default = PUSH_DEFAULT_CURRENT;
 977                else {
 978                        error("Malformed value for %s: %s", var, value);
 979                        return error("Must be one of nothing, matching, simple, "
 980                                     "upstream or current.");
 981                }
 982                return 0;
 983        }
 984
 985        /* Add other config variables here and to Documentation/config.txt. */
 986        return 0;
 987}
 988
 989static int git_default_mailmap_config(const char *var, const char *value)
 990{
 991        if (!strcmp(var, "mailmap.file"))
 992                return git_config_pathname(&git_mailmap_file, var, value);
 993        if (!strcmp(var, "mailmap.blob"))
 994                return git_config_string(&git_mailmap_blob, var, value);
 995
 996        /* Add other config variables here and to Documentation/config.txt. */
 997        return 0;
 998}
 999
1000int git_default_config(const char *var, const char *value, void *dummy)
1001{
1002        if (starts_with(var, "core."))
1003                return git_default_core_config(var, value);
1004
1005        if (starts_with(var, "user."))
1006                return git_ident_config(var, value, dummy);
1007
1008        if (starts_with(var, "i18n."))
1009                return git_default_i18n_config(var, value);
1010
1011        if (starts_with(var, "branch."))
1012                return git_default_branch_config(var, value);
1013
1014        if (starts_with(var, "push."))
1015                return git_default_push_config(var, value);
1016
1017        if (starts_with(var, "mailmap."))
1018                return git_default_mailmap_config(var, value);
1019
1020        if (starts_with(var, "advice."))
1021                return git_default_advice_config(var, value);
1022
1023        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
1024                pager_use_color = git_config_bool(var,value);
1025                return 0;
1026        }
1027
1028        if (!strcmp(var, "pack.packsizelimit")) {
1029                pack_size_limit_cfg = git_config_ulong(var, value);
1030                return 0;
1031        }
1032        /* Add other config variables here and to Documentation/config.txt. */
1033        return 0;
1034}
1035
1036/*
1037 * All source specific fields in the union, die_on_error, name and the callbacks
1038 * fgetc, ungetc, ftell of top need to be initialized before calling
1039 * this function.
1040 */
1041static int do_config_from(struct config_source *top, config_fn_t fn, void *data)
1042{
1043        int ret;
1044
1045        /* push config-file parsing state stack */
1046        top->prev = cf;
1047        top->linenr = 1;
1048        top->eof = 0;
1049        strbuf_init(&top->value, 1024);
1050        strbuf_init(&top->var, 1024);
1051        cf = top;
1052
1053        ret = git_parse_source(fn, data);
1054
1055        /* pop config-file parsing state stack */
1056        strbuf_release(&top->value);
1057        strbuf_release(&top->var);
1058        cf = top->prev;
1059
1060        return ret;
1061}
1062
1063static int do_config_from_file(config_fn_t fn,
1064                const char *name, const char *path, FILE *f, void *data)
1065{
1066        struct config_source top;
1067
1068        top.u.file = f;
1069        top.name = name;
1070        top.path = path;
1071        top.die_on_error = 1;
1072        top.do_fgetc = config_file_fgetc;
1073        top.do_ungetc = config_file_ungetc;
1074        top.do_ftell = config_file_ftell;
1075
1076        return do_config_from(&top, fn, data);
1077}
1078
1079static int git_config_from_stdin(config_fn_t fn, void *data)
1080{
1081        return do_config_from_file(fn, "<stdin>", NULL, stdin, data);
1082}
1083
1084int git_config_from_file(config_fn_t fn, const char *filename, void *data)
1085{
1086        int ret = -1;
1087        FILE *f;
1088
1089        f = fopen(filename, "r");
1090        if (f) {
1091                flockfile(f);
1092                ret = do_config_from_file(fn, filename, filename, f, data);
1093                funlockfile(f);
1094                fclose(f);
1095        }
1096        return ret;
1097}
1098
1099int git_config_from_buf(config_fn_t fn, const char *name, const char *buf,
1100                        size_t len, void *data)
1101{
1102        struct config_source top;
1103
1104        top.u.buf.buf = buf;
1105        top.u.buf.len = len;
1106        top.u.buf.pos = 0;
1107        top.name = name;
1108        top.path = NULL;
1109        top.die_on_error = 0;
1110        top.do_fgetc = config_buf_fgetc;
1111        top.do_ungetc = config_buf_ungetc;
1112        top.do_ftell = config_buf_ftell;
1113
1114        return do_config_from(&top, fn, data);
1115}
1116
1117static int git_config_from_blob_sha1(config_fn_t fn,
1118                                     const char *name,
1119                                     const unsigned char *sha1,
1120                                     void *data)
1121{
1122        enum object_type type;
1123        char *buf;
1124        unsigned long size;
1125        int ret;
1126
1127        buf = read_sha1_file(sha1, &type, &size);
1128        if (!buf)
1129                return error("unable to load config blob object '%s'", name);
1130        if (type != OBJ_BLOB) {
1131                free(buf);
1132                return error("reference '%s' does not point to a blob", name);
1133        }
1134
1135        ret = git_config_from_buf(fn, name, buf, size, data);
1136        free(buf);
1137
1138        return ret;
1139}
1140
1141static int git_config_from_blob_ref(config_fn_t fn,
1142                                    const char *name,
1143                                    void *data)
1144{
1145        unsigned char sha1[20];
1146
1147        if (get_sha1(name, sha1) < 0)
1148                return error("unable to resolve config blob '%s'", name);
1149        return git_config_from_blob_sha1(fn, name, sha1, data);
1150}
1151
1152const char *git_etc_gitconfig(void)
1153{
1154        static const char *system_wide;
1155        if (!system_wide)
1156                system_wide = system_path(ETC_GITCONFIG);
1157        return system_wide;
1158}
1159
1160/*
1161 * Parse environment variable 'k' as a boolean (in various
1162 * possible spellings); if missing, use the default value 'def'.
1163 */
1164int git_env_bool(const char *k, int def)
1165{
1166        const char *v = getenv(k);
1167        return v ? git_config_bool(k, v) : def;
1168}
1169
1170/*
1171 * Parse environment variable 'k' as ulong with possibly a unit
1172 * suffix; if missing, use the default value 'val'.
1173 */
1174unsigned long git_env_ulong(const char *k, unsigned long val)
1175{
1176        const char *v = getenv(k);
1177        if (v && !git_parse_ulong(v, &val))
1178                die("failed to parse %s", k);
1179        return val;
1180}
1181
1182int git_config_system(void)
1183{
1184        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
1185}
1186
1187int git_config_early(config_fn_t fn, void *data, const char *repo_config)
1188{
1189        int ret = 0, found = 0;
1190        char *xdg_config = xdg_config_home("config");
1191        char *user_config = expand_user_path("~/.gitconfig");
1192
1193        if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0)) {
1194                ret += git_config_from_file(fn, git_etc_gitconfig(),
1195                                            data);
1196                found += 1;
1197        }
1198
1199        if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK)) {
1200                ret += git_config_from_file(fn, xdg_config, data);
1201                found += 1;
1202        }
1203
1204        if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK)) {
1205                ret += git_config_from_file(fn, user_config, data);
1206                found += 1;
1207        }
1208
1209        if (repo_config && !access_or_die(repo_config, R_OK, 0)) {
1210                ret += git_config_from_file(fn, repo_config, data);
1211                found += 1;
1212        }
1213
1214        switch (git_config_from_parameters(fn, data)) {
1215        case -1: /* error */
1216                die(_("unable to parse command-line config"));
1217                break;
1218        case 0: /* found nothing */
1219                break;
1220        default: /* found at least one item */
1221                found++;
1222                break;
1223        }
1224
1225        free(xdg_config);
1226        free(user_config);
1227        return ret == 0 ? found : ret;
1228}
1229
1230int git_config_with_options(config_fn_t fn, void *data,
1231                            struct git_config_source *config_source,
1232                            int respect_includes)
1233{
1234        char *repo_config = NULL;
1235        int ret;
1236        struct config_include_data inc = CONFIG_INCLUDE_INIT;
1237
1238        if (respect_includes) {
1239                inc.fn = fn;
1240                inc.data = data;
1241                fn = git_config_include;
1242                data = &inc;
1243        }
1244
1245        /*
1246         * If we have a specific filename, use it. Otherwise, follow the
1247         * regular lookup sequence.
1248         */
1249        if (config_source && config_source->use_stdin)
1250                return git_config_from_stdin(fn, data);
1251        else if (config_source && config_source->file)
1252                return git_config_from_file(fn, config_source->file, data);
1253        else if (config_source && config_source->blob)
1254                return git_config_from_blob_ref(fn, config_source->blob, data);
1255
1256        repo_config = git_pathdup("config");
1257        ret = git_config_early(fn, data, repo_config);
1258        if (repo_config)
1259                free(repo_config);
1260        return ret;
1261}
1262
1263static void git_config_raw(config_fn_t fn, void *data)
1264{
1265        if (git_config_with_options(fn, data, NULL, 1) < 0)
1266                /*
1267                 * git_config_with_options() normally returns only
1268                 * positive values, as most errors are fatal, and
1269                 * non-fatal potential errors are guarded by "if"
1270                 * statements that are entered only when no error is
1271                 * possible.
1272                 *
1273                 * If we ever encounter a non-fatal error, it means
1274                 * something went really wrong and we should stop
1275                 * immediately.
1276                 */
1277                die(_("unknown error occured while reading the configuration files"));
1278}
1279
1280static void configset_iter(struct config_set *cs, config_fn_t fn, void *data)
1281{
1282        int i, value_index;
1283        struct string_list *values;
1284        struct config_set_element *entry;
1285        struct configset_list *list = &cs->list;
1286        struct key_value_info *kv_info;
1287
1288        for (i = 0; i < list->nr; i++) {
1289                entry = list->items[i].e;
1290                value_index = list->items[i].value_index;
1291                values = &entry->value_list;
1292                if (fn(entry->key, values->items[value_index].string, data) < 0) {
1293                        kv_info = values->items[value_index].util;
1294                        git_die_config_linenr(entry->key, kv_info->filename, kv_info->linenr);
1295                }
1296        }
1297}
1298
1299static void git_config_check_init(void);
1300
1301void git_config(config_fn_t fn, void *data)
1302{
1303        git_config_check_init();
1304        configset_iter(&the_config_set, fn, data);
1305}
1306
1307static struct config_set_element *configset_find_element(struct config_set *cs, const char *key)
1308{
1309        struct config_set_element k;
1310        struct config_set_element *found_entry;
1311        char *normalized_key;
1312        int ret;
1313        /*
1314         * `key` may come from the user, so normalize it before using it
1315         * for querying entries from the hashmap.
1316         */
1317        ret = git_config_parse_key(key, &normalized_key, NULL);
1318
1319        if (ret)
1320                return NULL;
1321
1322        hashmap_entry_init(&k, strhash(normalized_key));
1323        k.key = normalized_key;
1324        found_entry = hashmap_get(&cs->config_hash, &k, NULL);
1325        free(normalized_key);
1326        return found_entry;
1327}
1328
1329static int configset_add_value(struct config_set *cs, const char *key, const char *value)
1330{
1331        struct config_set_element *e;
1332        struct string_list_item *si;
1333        struct configset_list_item *l_item;
1334        struct key_value_info *kv_info = xmalloc(sizeof(*kv_info));
1335
1336        e = configset_find_element(cs, key);
1337        /*
1338         * Since the keys are being fed by git_config*() callback mechanism, they
1339         * are already normalized. So simply add them without any further munging.
1340         */
1341        if (!e) {
1342                e = xmalloc(sizeof(*e));
1343                hashmap_entry_init(e, strhash(key));
1344                e->key = xstrdup(key);
1345                string_list_init(&e->value_list, 1);
1346                hashmap_add(&cs->config_hash, e);
1347        }
1348        si = string_list_append_nodup(&e->value_list, xstrdup_or_null(value));
1349
1350        ALLOC_GROW(cs->list.items, cs->list.nr + 1, cs->list.alloc);
1351        l_item = &cs->list.items[cs->list.nr++];
1352        l_item->e = e;
1353        l_item->value_index = e->value_list.nr - 1;
1354
1355        if (cf) {
1356                kv_info->filename = strintern(cf->name);
1357                kv_info->linenr = cf->linenr;
1358        } else {
1359                /* for values read from `git_config_from_parameters()` */
1360                kv_info->filename = NULL;
1361                kv_info->linenr = -1;
1362        }
1363        si->util = kv_info;
1364
1365        return 0;
1366}
1367
1368static int config_set_element_cmp(const struct config_set_element *e1,
1369                                 const struct config_set_element *e2, const void *unused)
1370{
1371        return strcmp(e1->key, e2->key);
1372}
1373
1374void git_configset_init(struct config_set *cs)
1375{
1376        hashmap_init(&cs->config_hash, (hashmap_cmp_fn)config_set_element_cmp, 0);
1377        cs->hash_initialized = 1;
1378        cs->list.nr = 0;
1379        cs->list.alloc = 0;
1380        cs->list.items = NULL;
1381}
1382
1383void git_configset_clear(struct config_set *cs)
1384{
1385        struct config_set_element *entry;
1386        struct hashmap_iter iter;
1387        if (!cs->hash_initialized)
1388                return;
1389
1390        hashmap_iter_init(&cs->config_hash, &iter);
1391        while ((entry = hashmap_iter_next(&iter))) {
1392                free(entry->key);
1393                string_list_clear(&entry->value_list, 1);
1394        }
1395        hashmap_free(&cs->config_hash, 1);
1396        cs->hash_initialized = 0;
1397        free(cs->list.items);
1398        cs->list.nr = 0;
1399        cs->list.alloc = 0;
1400        cs->list.items = NULL;
1401}
1402
1403static int config_set_callback(const char *key, const char *value, void *cb)
1404{
1405        struct config_set *cs = cb;
1406        configset_add_value(cs, key, value);
1407        return 0;
1408}
1409
1410int git_configset_add_file(struct config_set *cs, const char *filename)
1411{
1412        return git_config_from_file(config_set_callback, filename, cs);
1413}
1414
1415int git_configset_get_value(struct config_set *cs, const char *key, const char **value)
1416{
1417        const struct string_list *values = NULL;
1418        /*
1419         * Follows "last one wins" semantic, i.e., if there are multiple matches for the
1420         * queried key in the files of the configset, the value returned will be the last
1421         * value in the value list for that key.
1422         */
1423        values = git_configset_get_value_multi(cs, key);
1424
1425        if (!values)
1426                return 1;
1427        assert(values->nr > 0);
1428        *value = values->items[values->nr - 1].string;
1429        return 0;
1430}
1431
1432const struct string_list *git_configset_get_value_multi(struct config_set *cs, const char *key)
1433{
1434        struct config_set_element *e = configset_find_element(cs, key);
1435        return e ? &e->value_list : NULL;
1436}
1437
1438int git_configset_get_string_const(struct config_set *cs, const char *key, const char **dest)
1439{
1440        const char *value;
1441        if (!git_configset_get_value(cs, key, &value))
1442                return git_config_string(dest, key, value);
1443        else
1444                return 1;
1445}
1446
1447int git_configset_get_string(struct config_set *cs, const char *key, char **dest)
1448{
1449        return git_configset_get_string_const(cs, key, (const char **)dest);
1450}
1451
1452int git_configset_get_int(struct config_set *cs, const char *key, int *dest)
1453{
1454        const char *value;
1455        if (!git_configset_get_value(cs, key, &value)) {
1456                *dest = git_config_int(key, value);
1457                return 0;
1458        } else
1459                return 1;
1460}
1461
1462int git_configset_get_ulong(struct config_set *cs, const char *key, unsigned long *dest)
1463{
1464        const char *value;
1465        if (!git_configset_get_value(cs, key, &value)) {
1466                *dest = git_config_ulong(key, value);
1467                return 0;
1468        } else
1469                return 1;
1470}
1471
1472int git_configset_get_bool(struct config_set *cs, const char *key, int *dest)
1473{
1474        const char *value;
1475        if (!git_configset_get_value(cs, key, &value)) {
1476                *dest = git_config_bool(key, value);
1477                return 0;
1478        } else
1479                return 1;
1480}
1481
1482int git_configset_get_bool_or_int(struct config_set *cs, const char *key,
1483                                int *is_bool, int *dest)
1484{
1485        const char *value;
1486        if (!git_configset_get_value(cs, key, &value)) {
1487                *dest = git_config_bool_or_int(key, value, is_bool);
1488                return 0;
1489        } else
1490                return 1;
1491}
1492
1493int git_configset_get_maybe_bool(struct config_set *cs, const char *key, int *dest)
1494{
1495        const char *value;
1496        if (!git_configset_get_value(cs, key, &value)) {
1497                *dest = git_config_maybe_bool(key, value);
1498                if (*dest == -1)
1499                        return -1;
1500                return 0;
1501        } else
1502                return 1;
1503}
1504
1505int git_configset_get_pathname(struct config_set *cs, const char *key, const char **dest)
1506{
1507        const char *value;
1508        if (!git_configset_get_value(cs, key, &value))
1509                return git_config_pathname(dest, key, value);
1510        else
1511                return 1;
1512}
1513
1514static void git_config_check_init(void)
1515{
1516        if (the_config_set.hash_initialized)
1517                return;
1518        git_configset_init(&the_config_set);
1519        git_config_raw(config_set_callback, &the_config_set);
1520}
1521
1522void git_config_clear(void)
1523{
1524        if (!the_config_set.hash_initialized)
1525                return;
1526        git_configset_clear(&the_config_set);
1527}
1528
1529int git_config_get_value(const char *key, const char **value)
1530{
1531        git_config_check_init();
1532        return git_configset_get_value(&the_config_set, key, value);
1533}
1534
1535const struct string_list *git_config_get_value_multi(const char *key)
1536{
1537        git_config_check_init();
1538        return git_configset_get_value_multi(&the_config_set, key);
1539}
1540
1541int git_config_get_string_const(const char *key, const char **dest)
1542{
1543        int ret;
1544        git_config_check_init();
1545        ret = git_configset_get_string_const(&the_config_set, key, dest);
1546        if (ret < 0)
1547                git_die_config(key, NULL);
1548        return ret;
1549}
1550
1551int git_config_get_string(const char *key, char **dest)
1552{
1553        git_config_check_init();
1554        return git_config_get_string_const(key, (const char **)dest);
1555}
1556
1557int git_config_get_int(const char *key, int *dest)
1558{
1559        git_config_check_init();
1560        return git_configset_get_int(&the_config_set, key, dest);
1561}
1562
1563int git_config_get_ulong(const char *key, unsigned long *dest)
1564{
1565        git_config_check_init();
1566        return git_configset_get_ulong(&the_config_set, key, dest);
1567}
1568
1569int git_config_get_bool(const char *key, int *dest)
1570{
1571        git_config_check_init();
1572        return git_configset_get_bool(&the_config_set, key, dest);
1573}
1574
1575int git_config_get_bool_or_int(const char *key, int *is_bool, int *dest)
1576{
1577        git_config_check_init();
1578        return git_configset_get_bool_or_int(&the_config_set, key, is_bool, dest);
1579}
1580
1581int git_config_get_maybe_bool(const char *key, int *dest)
1582{
1583        git_config_check_init();
1584        return git_configset_get_maybe_bool(&the_config_set, key, dest);
1585}
1586
1587int git_config_get_pathname(const char *key, const char **dest)
1588{
1589        int ret;
1590        git_config_check_init();
1591        ret = git_configset_get_pathname(&the_config_set, key, dest);
1592        if (ret < 0)
1593                git_die_config(key, NULL);
1594        return ret;
1595}
1596
1597NORETURN
1598void git_die_config_linenr(const char *key, const char *filename, int linenr)
1599{
1600        if (!filename)
1601                die(_("unable to parse '%s' from command-line config"), key);
1602        else
1603                die(_("bad config variable '%s' in file '%s' at line %d"),
1604                    key, filename, linenr);
1605}
1606
1607NORETURN __attribute__((format(printf, 2, 3)))
1608void git_die_config(const char *key, const char *err, ...)
1609{
1610        const struct string_list *values;
1611        struct key_value_info *kv_info;
1612
1613        if (err) {
1614                va_list params;
1615                va_start(params, err);
1616                vreportf("error: ", err, params);
1617                va_end(params);
1618        }
1619        values = git_config_get_value_multi(key);
1620        kv_info = values->items[values->nr - 1].util;
1621        git_die_config_linenr(key, kv_info->filename, kv_info->linenr);
1622}
1623
1624/*
1625 * Find all the stuff for git_config_set() below.
1626 */
1627
1628static struct {
1629        int baselen;
1630        char *key;
1631        int do_not_match;
1632        regex_t *value_regex;
1633        int multi_replace;
1634        size_t *offset;
1635        unsigned int offset_alloc;
1636        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1637        int seen;
1638} store;
1639
1640static int matches(const char *key, const char *value)
1641{
1642        if (strcmp(key, store.key))
1643                return 0; /* not ours */
1644        if (!store.value_regex)
1645                return 1; /* always matches */
1646        if (store.value_regex == CONFIG_REGEX_NONE)
1647                return 0; /* never matches */
1648
1649        return store.do_not_match ^
1650                (value && !regexec(store.value_regex, value, 0, NULL, 0));
1651}
1652
1653static int store_aux(const char *key, const char *value, void *cb)
1654{
1655        const char *ep;
1656        size_t section_len;
1657
1658        switch (store.state) {
1659        case KEY_SEEN:
1660                if (matches(key, value)) {
1661                        if (store.seen == 1 && store.multi_replace == 0) {
1662                                warning(_("%s has multiple values"), key);
1663                        }
1664
1665                        ALLOC_GROW(store.offset, store.seen + 1,
1666                                   store.offset_alloc);
1667
1668                        store.offset[store.seen] = cf->do_ftell(cf);
1669                        store.seen++;
1670                }
1671                break;
1672        case SECTION_SEEN:
1673                /*
1674                 * What we are looking for is in store.key (both
1675                 * section and var), and its section part is baselen
1676                 * long.  We found key (again, both section and var).
1677                 * We would want to know if this key is in the same
1678                 * section as what we are looking for.  We already
1679                 * know we are in the same section as what should
1680                 * hold store.key.
1681                 */
1682                ep = strrchr(key, '.');
1683                section_len = ep - key;
1684
1685                if ((section_len != store.baselen) ||
1686                    memcmp(key, store.key, section_len+1)) {
1687                        store.state = SECTION_END_SEEN;
1688                        break;
1689                }
1690
1691                /*
1692                 * Do not increment matches: this is no match, but we
1693                 * just made sure we are in the desired section.
1694                 */
1695                ALLOC_GROW(store.offset, store.seen + 1,
1696                           store.offset_alloc);
1697                store.offset[store.seen] = cf->do_ftell(cf);
1698                /* fallthru */
1699        case SECTION_END_SEEN:
1700        case START:
1701                if (matches(key, value)) {
1702                        ALLOC_GROW(store.offset, store.seen + 1,
1703                                   store.offset_alloc);
1704                        store.offset[store.seen] = cf->do_ftell(cf);
1705                        store.state = KEY_SEEN;
1706                        store.seen++;
1707                } else {
1708                        if (strrchr(key, '.') - key == store.baselen &&
1709                              !strncmp(key, store.key, store.baselen)) {
1710                                        store.state = SECTION_SEEN;
1711                                        ALLOC_GROW(store.offset,
1712                                                   store.seen + 1,
1713                                                   store.offset_alloc);
1714                                        store.offset[store.seen] = cf->do_ftell(cf);
1715                        }
1716                }
1717        }
1718        return 0;
1719}
1720
1721static int write_error(const char *filename)
1722{
1723        error("failed to write new configuration file %s", filename);
1724
1725        /* Same error code as "failed to rename". */
1726        return 4;
1727}
1728
1729static int store_write_section(int fd, const char *key)
1730{
1731        const char *dot;
1732        int i, success;
1733        struct strbuf sb = STRBUF_INIT;
1734
1735        dot = memchr(key, '.', store.baselen);
1736        if (dot) {
1737                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1738                for (i = dot - key + 1; i < store.baselen; i++) {
1739                        if (key[i] == '"' || key[i] == '\\')
1740                                strbuf_addch(&sb, '\\');
1741                        strbuf_addch(&sb, key[i]);
1742                }
1743                strbuf_addstr(&sb, "\"]\n");
1744        } else {
1745                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1746        }
1747
1748        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1749        strbuf_release(&sb);
1750
1751        return success;
1752}
1753
1754static int store_write_pair(int fd, const char *key, const char *value)
1755{
1756        int i, success;
1757        int length = strlen(key + store.baselen + 1);
1758        const char *quote = "";
1759        struct strbuf sb = STRBUF_INIT;
1760
1761        /*
1762         * Check to see if the value needs to be surrounded with a dq pair.
1763         * Note that problematic characters are always backslash-quoted; this
1764         * check is about not losing leading or trailing SP and strings that
1765         * follow beginning-of-comment characters (i.e. ';' and '#') by the
1766         * configuration parser.
1767         */
1768        if (value[0] == ' ')
1769                quote = "\"";
1770        for (i = 0; value[i]; i++)
1771                if (value[i] == ';' || value[i] == '#')
1772                        quote = "\"";
1773        if (i && value[i - 1] == ' ')
1774                quote = "\"";
1775
1776        strbuf_addf(&sb, "\t%.*s = %s",
1777                    length, key + store.baselen + 1, quote);
1778
1779        for (i = 0; value[i]; i++)
1780                switch (value[i]) {
1781                case '\n':
1782                        strbuf_addstr(&sb, "\\n");
1783                        break;
1784                case '\t':
1785                        strbuf_addstr(&sb, "\\t");
1786                        break;
1787                case '"':
1788                case '\\':
1789                        strbuf_addch(&sb, '\\');
1790                default:
1791                        strbuf_addch(&sb, value[i]);
1792                        break;
1793                }
1794        strbuf_addf(&sb, "%s\n", quote);
1795
1796        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1797        strbuf_release(&sb);
1798
1799        return success;
1800}
1801
1802static ssize_t find_beginning_of_line(const char *contents, size_t size,
1803        size_t offset_, int *found_bracket)
1804{
1805        size_t equal_offset = size, bracket_offset = size;
1806        ssize_t offset;
1807
1808contline:
1809        for (offset = offset_-2; offset > 0
1810                        && contents[offset] != '\n'; offset--)
1811                switch (contents[offset]) {
1812                        case '=': equal_offset = offset; break;
1813                        case ']': bracket_offset = offset; break;
1814                }
1815        if (offset > 0 && contents[offset-1] == '\\') {
1816                offset_ = offset;
1817                goto contline;
1818        }
1819        if (bracket_offset < equal_offset) {
1820                *found_bracket = 1;
1821                offset = bracket_offset+1;
1822        } else
1823                offset++;
1824
1825        return offset;
1826}
1827
1828int git_config_set_in_file(const char *config_filename,
1829                        const char *key, const char *value)
1830{
1831        return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1832}
1833
1834int git_config_set(const char *key, const char *value)
1835{
1836        return git_config_set_multivar(key, value, NULL, 0);
1837}
1838
1839/*
1840 * Auxiliary function to sanity-check and split the key into the section
1841 * identifier and variable name.
1842 *
1843 * Returns 0 on success, -1 when there is an invalid character in the key and
1844 * -2 if there is no section name in the key.
1845 *
1846 * store_key - pointer to char* which will hold a copy of the key with
1847 *             lowercase section and variable name
1848 * baselen - pointer to int which will hold the length of the
1849 *           section + subsection part, can be NULL
1850 */
1851static int git_config_parse_key_1(const char *key, char **store_key, int *baselen_, int quiet)
1852{
1853        int i, dot, baselen;
1854        const char *last_dot = strrchr(key, '.');
1855
1856        /*
1857         * Since "key" actually contains the section name and the real
1858         * key name separated by a dot, we have to know where the dot is.
1859         */
1860
1861        if (last_dot == NULL || last_dot == key) {
1862                if (!quiet)
1863                        error("key does not contain a section: %s", key);
1864                return -CONFIG_NO_SECTION_OR_NAME;
1865        }
1866
1867        if (!last_dot[1]) {
1868                if (!quiet)
1869                        error("key does not contain variable name: %s", key);
1870                return -CONFIG_NO_SECTION_OR_NAME;
1871        }
1872
1873        baselen = last_dot - key;
1874        if (baselen_)
1875                *baselen_ = baselen;
1876
1877        /*
1878         * Validate the key and while at it, lower case it for matching.
1879         */
1880        if (store_key)
1881                *store_key = xmalloc(strlen(key) + 1);
1882
1883        dot = 0;
1884        for (i = 0; key[i]; i++) {
1885                unsigned char c = key[i];
1886                if (c == '.')
1887                        dot = 1;
1888                /* Leave the extended basename untouched.. */
1889                if (!dot || i > baselen) {
1890                        if (!iskeychar(c) ||
1891                            (i == baselen + 1 && !isalpha(c))) {
1892                                if (!quiet)
1893                                        error("invalid key: %s", key);
1894                                goto out_free_ret_1;
1895                        }
1896                        c = tolower(c);
1897                } else if (c == '\n') {
1898                        if (!quiet)
1899                                error("invalid key (newline): %s", key);
1900                        goto out_free_ret_1;
1901                }
1902                if (store_key)
1903                        (*store_key)[i] = c;
1904        }
1905        if (store_key)
1906                (*store_key)[i] = 0;
1907
1908        return 0;
1909
1910out_free_ret_1:
1911        if (store_key) {
1912                free(*store_key);
1913                *store_key = NULL;
1914        }
1915        return -CONFIG_INVALID_KEY;
1916}
1917
1918int git_config_parse_key(const char *key, char **store_key, int *baselen)
1919{
1920        return git_config_parse_key_1(key, store_key, baselen, 0);
1921}
1922
1923int git_config_key_is_valid(const char *key)
1924{
1925        return !git_config_parse_key_1(key, NULL, NULL, 1);
1926}
1927
1928/*
1929 * If value==NULL, unset in (remove from) config,
1930 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1931 * if value_regex==CONFIG_REGEX_NONE, do not match any existing values
1932 *     (only add a new one)
1933 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1934 *     else all matching key/values (regardless how many) are removed,
1935 *     before the new pair is written.
1936 *
1937 * Returns 0 on success.
1938 *
1939 * This function does this:
1940 *
1941 * - it locks the config file by creating ".git/config.lock"
1942 *
1943 * - it then parses the config using store_aux() as validator to find
1944 *   the position on the key/value pair to replace. If it is to be unset,
1945 *   it must be found exactly once.
1946 *
1947 * - the config file is mmap()ed and the part before the match (if any) is
1948 *   written to the lock file, then the changed part and the rest.
1949 *
1950 * - the config file is removed and the lock file rename()d to it.
1951 *
1952 */
1953int git_config_set_multivar_in_file(const char *config_filename,
1954                                const char *key, const char *value,
1955                                const char *value_regex, int multi_replace)
1956{
1957        int fd = -1, in_fd = -1;
1958        int ret;
1959        struct lock_file *lock = NULL;
1960        char *filename_buf = NULL;
1961        char *contents = NULL;
1962        size_t contents_sz;
1963
1964        /* parse-key returns negative; flip the sign to feed exit(3) */
1965        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1966        if (ret)
1967                goto out_free;
1968
1969        store.multi_replace = multi_replace;
1970
1971        if (!config_filename)
1972                config_filename = filename_buf = git_pathdup("config");
1973
1974        /*
1975         * The lock serves a purpose in addition to locking: the new
1976         * contents of .git/config will be written into it.
1977         */
1978        lock = xcalloc(1, sizeof(struct lock_file));
1979        fd = hold_lock_file_for_update(lock, config_filename, 0);
1980        if (fd < 0) {
1981                error("could not lock config file %s: %s", config_filename, strerror(errno));
1982                free(store.key);
1983                ret = CONFIG_NO_LOCK;
1984                goto out_free;
1985        }
1986
1987        /*
1988         * If .git/config does not exist yet, write a minimal version.
1989         */
1990        in_fd = open(config_filename, O_RDONLY);
1991        if ( in_fd < 0 ) {
1992                free(store.key);
1993
1994                if ( ENOENT != errno ) {
1995                        error("opening %s: %s", config_filename,
1996                              strerror(errno));
1997                        ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1998                        goto out_free;
1999                }
2000                /* if nothing to unset, error out */
2001                if (value == NULL) {
2002                        ret = CONFIG_NOTHING_SET;
2003                        goto out_free;
2004                }
2005
2006                store.key = (char *)key;
2007                if (!store_write_section(fd, key) ||
2008                    !store_write_pair(fd, key, value))
2009                        goto write_err_out;
2010        } else {
2011                struct stat st;
2012                size_t copy_begin, copy_end;
2013                int i, new_line = 0;
2014
2015                if (value_regex == NULL)
2016                        store.value_regex = NULL;
2017                else if (value_regex == CONFIG_REGEX_NONE)
2018                        store.value_regex = CONFIG_REGEX_NONE;
2019                else {
2020                        if (value_regex[0] == '!') {
2021                                store.do_not_match = 1;
2022                                value_regex++;
2023                        } else
2024                                store.do_not_match = 0;
2025
2026                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
2027                        if (regcomp(store.value_regex, value_regex,
2028                                        REG_EXTENDED)) {
2029                                error("invalid pattern: %s", value_regex);
2030                                free(store.value_regex);
2031                                ret = CONFIG_INVALID_PATTERN;
2032                                goto out_free;
2033                        }
2034                }
2035
2036                ALLOC_GROW(store.offset, 1, store.offset_alloc);
2037                store.offset[0] = 0;
2038                store.state = START;
2039                store.seen = 0;
2040
2041                /*
2042                 * After this, store.offset will contain the *end* offset
2043                 * of the last match, or remain at 0 if no match was found.
2044                 * As a side effect, we make sure to transform only a valid
2045                 * existing config file.
2046                 */
2047                if (git_config_from_file(store_aux, config_filename, NULL)) {
2048                        error("invalid config file %s", config_filename);
2049                        free(store.key);
2050                        if (store.value_regex != NULL &&
2051                            store.value_regex != CONFIG_REGEX_NONE) {
2052                                regfree(store.value_regex);
2053                                free(store.value_regex);
2054                        }
2055                        ret = CONFIG_INVALID_FILE;
2056                        goto out_free;
2057                }
2058
2059                free(store.key);
2060                if (store.value_regex != NULL &&
2061                    store.value_regex != CONFIG_REGEX_NONE) {
2062                        regfree(store.value_regex);
2063                        free(store.value_regex);
2064                }
2065
2066                /* if nothing to unset, or too many matches, error out */
2067                if ((store.seen == 0 && value == NULL) ||
2068                                (store.seen > 1 && multi_replace == 0)) {
2069                        ret = CONFIG_NOTHING_SET;
2070                        goto out_free;
2071                }
2072
2073                fstat(in_fd, &st);
2074                contents_sz = xsize_t(st.st_size);
2075                contents = xmmap_gently(NULL, contents_sz, PROT_READ,
2076                                        MAP_PRIVATE, in_fd, 0);
2077                if (contents == MAP_FAILED) {
2078                        if (errno == ENODEV && S_ISDIR(st.st_mode))
2079                                errno = EISDIR;
2080                        error("unable to mmap '%s': %s",
2081                              config_filename, strerror(errno));
2082                        ret = CONFIG_INVALID_FILE;
2083                        contents = NULL;
2084                        goto out_free;
2085                }
2086                close(in_fd);
2087                in_fd = -1;
2088
2089                if (chmod(get_lock_file_path(lock), st.st_mode & 07777) < 0) {
2090                        error("chmod on %s failed: %s",
2091                              get_lock_file_path(lock), strerror(errno));
2092                        ret = CONFIG_NO_WRITE;
2093                        goto out_free;
2094                }
2095
2096                if (store.seen == 0)
2097                        store.seen = 1;
2098
2099                for (i = 0, copy_begin = 0; i < store.seen; i++) {
2100                        if (store.offset[i] == 0) {
2101                                store.offset[i] = copy_end = contents_sz;
2102                        } else if (store.state != KEY_SEEN) {
2103                                copy_end = store.offset[i];
2104                        } else
2105                                copy_end = find_beginning_of_line(
2106                                        contents, contents_sz,
2107                                        store.offset[i]-2, &new_line);
2108
2109                        if (copy_end > 0 && contents[copy_end-1] != '\n')
2110                                new_line = 1;
2111
2112                        /* write the first part of the config */
2113                        if (copy_end > copy_begin) {
2114                                if (write_in_full(fd, contents + copy_begin,
2115                                                  copy_end - copy_begin) <
2116                                    copy_end - copy_begin)
2117                                        goto write_err_out;
2118                                if (new_line &&
2119                                    write_str_in_full(fd, "\n") != 1)
2120                                        goto write_err_out;
2121                        }
2122                        copy_begin = store.offset[i];
2123                }
2124
2125                /* write the pair (value == NULL means unset) */
2126                if (value != NULL) {
2127                        if (store.state == START) {
2128                                if (!store_write_section(fd, key))
2129                                        goto write_err_out;
2130                        }
2131                        if (!store_write_pair(fd, key, value))
2132                                goto write_err_out;
2133                }
2134
2135                /* write the rest of the config */
2136                if (copy_begin < contents_sz)
2137                        if (write_in_full(fd, contents + copy_begin,
2138                                          contents_sz - copy_begin) <
2139                            contents_sz - copy_begin)
2140                                goto write_err_out;
2141
2142                munmap(contents, contents_sz);
2143                contents = NULL;
2144        }
2145
2146        if (commit_lock_file(lock) < 0) {
2147                error("could not write config file %s: %s", config_filename,
2148                      strerror(errno));
2149                ret = CONFIG_NO_WRITE;
2150                lock = NULL;
2151                goto out_free;
2152        }
2153
2154        /*
2155         * lock is committed, so don't try to roll it back below.
2156         * NOTE: Since lockfile.c keeps a linked list of all created
2157         * lock_file structures, it isn't safe to free(lock).  It's
2158         * better to just leave it hanging around.
2159         */
2160        lock = NULL;
2161        ret = 0;
2162
2163        /* Invalidate the config cache */
2164        git_config_clear();
2165
2166out_free:
2167        if (lock)
2168                rollback_lock_file(lock);
2169        free(filename_buf);
2170        if (contents)
2171                munmap(contents, contents_sz);
2172        if (in_fd >= 0)
2173                close(in_fd);
2174        return ret;
2175
2176write_err_out:
2177        ret = write_error(get_lock_file_path(lock));
2178        goto out_free;
2179
2180}
2181
2182int git_config_set_multivar(const char *key, const char *value,
2183                        const char *value_regex, int multi_replace)
2184{
2185        return git_config_set_multivar_in_file(NULL, key, value, value_regex,
2186                                               multi_replace);
2187}
2188
2189static int section_name_match (const char *buf, const char *name)
2190{
2191        int i = 0, j = 0, dot = 0;
2192        if (buf[i] != '[')
2193                return 0;
2194        for (i = 1; buf[i] && buf[i] != ']'; i++) {
2195                if (!dot && isspace(buf[i])) {
2196                        dot = 1;
2197                        if (name[j++] != '.')
2198                                break;
2199                        for (i++; isspace(buf[i]); i++)
2200                                ; /* do nothing */
2201                        if (buf[i] != '"')
2202                                break;
2203                        continue;
2204                }
2205                if (buf[i] == '\\' && dot)
2206                        i++;
2207                else if (buf[i] == '"' && dot) {
2208                        for (i++; isspace(buf[i]); i++)
2209                                ; /* do_nothing */
2210                        break;
2211                }
2212                if (buf[i] != name[j++])
2213                        break;
2214        }
2215        if (buf[i] == ']' && name[j] == 0) {
2216                /*
2217                 * We match, now just find the right length offset by
2218                 * gobbling up any whitespace after it, as well
2219                 */
2220                i++;
2221                for (; buf[i] && isspace(buf[i]); i++)
2222                        ; /* do nothing */
2223                return i;
2224        }
2225        return 0;
2226}
2227
2228static int section_name_is_ok(const char *name)
2229{
2230        /* Empty section names are bogus. */
2231        if (!*name)
2232                return 0;
2233
2234        /*
2235         * Before a dot, we must be alphanumeric or dash. After the first dot,
2236         * anything goes, so we can stop checking.
2237         */
2238        for (; *name && *name != '.'; name++)
2239                if (*name != '-' && !isalnum(*name))
2240                        return 0;
2241        return 1;
2242}
2243
2244/* if new_name == NULL, the section is removed instead */
2245int git_config_rename_section_in_file(const char *config_filename,
2246                                      const char *old_name, const char *new_name)
2247{
2248        int ret = 0, remove = 0;
2249        char *filename_buf = NULL;
2250        struct lock_file *lock;
2251        int out_fd;
2252        char buf[1024];
2253        FILE *config_file;
2254        struct stat st;
2255
2256        if (new_name && !section_name_is_ok(new_name)) {
2257                ret = error("invalid section name: %s", new_name);
2258                goto out;
2259        }
2260
2261        if (!config_filename)
2262                config_filename = filename_buf = git_pathdup("config");
2263
2264        lock = xcalloc(1, sizeof(struct lock_file));
2265        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
2266        if (out_fd < 0) {
2267                ret = error("could not lock config file %s", config_filename);
2268                goto out;
2269        }
2270
2271        if (!(config_file = fopen(config_filename, "rb"))) {
2272                /* no config file means nothing to rename, no error */
2273                goto unlock_and_out;
2274        }
2275
2276        fstat(fileno(config_file), &st);
2277
2278        if (chmod(get_lock_file_path(lock), st.st_mode & 07777) < 0) {
2279                ret = error("chmod on %s failed: %s",
2280                            get_lock_file_path(lock), strerror(errno));
2281                goto out;
2282        }
2283
2284        while (fgets(buf, sizeof(buf), config_file)) {
2285                int i;
2286                int length;
2287                char *output = buf;
2288                for (i = 0; buf[i] && isspace(buf[i]); i++)
2289                        ; /* do nothing */
2290                if (buf[i] == '[') {
2291                        /* it's a section */
2292                        int offset = section_name_match(&buf[i], old_name);
2293                        if (offset > 0) {
2294                                ret++;
2295                                if (new_name == NULL) {
2296                                        remove = 1;
2297                                        continue;
2298                                }
2299                                store.baselen = strlen(new_name);
2300                                if (!store_write_section(out_fd, new_name)) {
2301                                        ret = write_error(get_lock_file_path(lock));
2302                                        goto out;
2303                                }
2304                                /*
2305                                 * We wrote out the new section, with
2306                                 * a newline, now skip the old
2307                                 * section's length
2308                                 */
2309                                output += offset + i;
2310                                if (strlen(output) > 0) {
2311                                        /*
2312                                         * More content means there's
2313                                         * a declaration to put on the
2314                                         * next line; indent with a
2315                                         * tab
2316                                         */
2317                                        output -= 1;
2318                                        output[0] = '\t';
2319                                }
2320                        }
2321                        remove = 0;
2322                }
2323                if (remove)
2324                        continue;
2325                length = strlen(output);
2326                if (write_in_full(out_fd, output, length) != length) {
2327                        ret = write_error(get_lock_file_path(lock));
2328                        goto out;
2329                }
2330        }
2331        fclose(config_file);
2332unlock_and_out:
2333        if (commit_lock_file(lock) < 0)
2334                ret = error("could not write config file %s: %s",
2335                            config_filename, strerror(errno));
2336out:
2337        free(filename_buf);
2338        return ret;
2339}
2340
2341int git_config_rename_section(const char *old_name, const char *new_name)
2342{
2343        return git_config_rename_section_in_file(NULL, old_name, new_name);
2344}
2345
2346/*
2347 * Call this to report error for your variable that should not
2348 * get a boolean value (i.e. "[my] var" means "true").
2349 */
2350#undef config_error_nonbool
2351int config_error_nonbool(const char *var)
2352{
2353        return error("Missing value for '%s'", var);
2354}
2355
2356int parse_config_key(const char *var,
2357                     const char *section,
2358                     const char **subsection, int *subsection_len,
2359                     const char **key)
2360{
2361        int section_len = strlen(section);
2362        const char *dot;
2363
2364        /* Does it start with "section." ? */
2365        if (!starts_with(var, section) || var[section_len] != '.')
2366                return -1;
2367
2368        /*
2369         * Find the key; we don't know yet if we have a subsection, but we must
2370         * parse backwards from the end, since the subsection may have dots in
2371         * it, too.
2372         */
2373        dot = strrchr(var, '.');
2374        *key = dot + 1;
2375
2376        /* Did we have a subsection at all? */
2377        if (dot == var + section_len) {
2378                *subsection = NULL;
2379                *subsection_len = 0;
2380        }
2381        else {
2382                *subsection = var + section_len + 1;
2383                *subsection_len = dot - *subsection;
2384        }
2385
2386        return 0;
2387}