22fef4050bb5d411ea991f5a84644b9308f2f836
   1/*
   2 * GIT - The information manager from hell
   3 *
   4 * Copyright (C) Linus Torvalds, 2005
   5 * Copyright (C) Johannes Schindelin, 2005
   6 *
   7 */
   8#include "cache.h"
   9#include "exec_cmd.h"
  10#include "strbuf.h"
  11#include "quote.h"
  12#include "hashmap.h"
  13#include "string-list.h"
  14
  15struct config_source {
  16        struct config_source *prev;
  17        union {
  18                FILE *file;
  19                struct config_buf {
  20                        const char *buf;
  21                        size_t len;
  22                        size_t pos;
  23                } buf;
  24        } u;
  25        const char *name;
  26        const char *path;
  27        int die_on_error;
  28        int linenr;
  29        int eof;
  30        struct strbuf value;
  31        struct strbuf var;
  32
  33        int (*do_fgetc)(struct config_source *c);
  34        int (*do_ungetc)(int c, struct config_source *conf);
  35        long (*do_ftell)(struct config_source *c);
  36};
  37
  38struct config_set_element {
  39        struct hashmap_entry ent;
  40        char *key;
  41        struct string_list value_list;
  42};
  43
  44static struct config_source *cf;
  45
  46static int zlib_compression_seen;
  47
  48/*
  49 * Default config_set that contains key-value pairs from the usual set of config
  50 * config files (i.e repo specific .git/config, user wide ~/.gitconfig, XDG
  51 * config file and the global /etc/gitconfig)
  52 */
  53static struct config_set the_config_set;
  54
  55static int config_file_fgetc(struct config_source *conf)
  56{
  57        return fgetc(conf->u.file);
  58}
  59
  60static int config_file_ungetc(int c, struct config_source *conf)
  61{
  62        return ungetc(c, conf->u.file);
  63}
  64
  65static long config_file_ftell(struct config_source *conf)
  66{
  67        return ftell(conf->u.file);
  68}
  69
  70
  71static int config_buf_fgetc(struct config_source *conf)
  72{
  73        if (conf->u.buf.pos < conf->u.buf.len)
  74                return conf->u.buf.buf[conf->u.buf.pos++];
  75
  76        return EOF;
  77}
  78
  79static int config_buf_ungetc(int c, struct config_source *conf)
  80{
  81        if (conf->u.buf.pos > 0)
  82                return conf->u.buf.buf[--conf->u.buf.pos];
  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        const char *type;
 146        int ret;
 147
 148        /*
 149         * Pass along all values, including "include" directives; this makes it
 150         * possible to query information on the includes themselves.
 151         */
 152        ret = inc->fn(var, value, inc->data);
 153        if (ret < 0)
 154                return ret;
 155
 156        if (!skip_prefix(var, "include.", &type))
 157                return ret;
 158
 159        if (!strcmp(type, "path"))
 160                ret = handle_path_include(value, inc);
 161        return ret;
 162}
 163
 164void git_config_push_parameter(const char *text)
 165{
 166        struct strbuf env = STRBUF_INIT;
 167        const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
 168        if (old) {
 169                strbuf_addstr(&env, old);
 170                strbuf_addch(&env, ' ');
 171        }
 172        sq_quote_buf(&env, text);
 173        setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
 174        strbuf_release(&env);
 175}
 176
 177int git_config_parse_parameter(const char *text,
 178                               config_fn_t fn, void *data)
 179{
 180        struct strbuf **pair;
 181        pair = strbuf_split_str(text, '=', 2);
 182        if (!pair[0])
 183                return error("bogus config parameter: %s", text);
 184        if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
 185                strbuf_setlen(pair[0], pair[0]->len - 1);
 186        strbuf_trim(pair[0]);
 187        if (!pair[0]->len) {
 188                strbuf_list_free(pair);
 189                return error("bogus config parameter: %s", text);
 190        }
 191        strbuf_tolower(pair[0]);
 192        if (fn(pair[0]->buf, pair[1] ? pair[1]->buf : NULL, data) < 0) {
 193                strbuf_list_free(pair);
 194                return -1;
 195        }
 196        strbuf_list_free(pair);
 197        return 0;
 198}
 199
 200int git_config_from_parameters(config_fn_t fn, void *data)
 201{
 202        const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 203        char *envw;
 204        const char **argv = NULL;
 205        int nr = 0, alloc = 0;
 206        int i;
 207
 208        if (!env)
 209                return 0;
 210        /* sq_dequote will write over it */
 211        envw = xstrdup(env);
 212
 213        if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 214                free(envw);
 215                return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
 216        }
 217
 218        for (i = 0; i < nr; i++) {
 219                if (git_config_parse_parameter(argv[i], fn, data) < 0) {
 220                        free(argv);
 221                        free(envw);
 222                        return -1;
 223                }
 224        }
 225
 226        free(argv);
 227        free(envw);
 228        return nr > 0;
 229}
 230
 231static int get_next_char(void)
 232{
 233        int c = cf->do_fgetc(cf);
 234
 235        if (c == '\r') {
 236                /* DOS like systems */
 237                c = cf->do_fgetc(cf);
 238                if (c != '\n') {
 239                        cf->do_ungetc(c, cf);
 240                        c = '\r';
 241                }
 242        }
 243        if (c == '\n')
 244                cf->linenr++;
 245        if (c == EOF) {
 246                cf->eof = 1;
 247                cf->linenr++;
 248                c = '\n';
 249        }
 250        return c;
 251}
 252
 253static char *parse_value(void)
 254{
 255        int quote = 0, comment = 0, space = 0;
 256
 257        strbuf_reset(&cf->value);
 258        for (;;) {
 259                int c = get_next_char();
 260                if (c == '\n') {
 261                        if (quote) {
 262                                cf->linenr--;
 263                                return NULL;
 264                        }
 265                        return cf->value.buf;
 266                }
 267                if (comment)
 268                        continue;
 269                if (isspace(c) && !quote) {
 270                        if (cf->value.len)
 271                                space++;
 272                        continue;
 273                }
 274                if (!quote) {
 275                        if (c == ';' || c == '#') {
 276                                comment = 1;
 277                                continue;
 278                        }
 279                }
 280                for (; space; space--)
 281                        strbuf_addch(&cf->value, ' ');
 282                if (c == '\\') {
 283                        c = get_next_char();
 284                        switch (c) {
 285                        case '\n':
 286                                continue;
 287                        case 't':
 288                                c = '\t';
 289                                break;
 290                        case 'b':
 291                                c = '\b';
 292                                break;
 293                        case 'n':
 294                                c = '\n';
 295                                break;
 296                        /* Some characters escape as themselves */
 297                        case '\\': case '"':
 298                                break;
 299                        /* Reject unknown escape sequences */
 300                        default:
 301                                return NULL;
 302                        }
 303                        strbuf_addch(&cf->value, c);
 304                        continue;
 305                }
 306                if (c == '"') {
 307                        quote = 1-quote;
 308                        continue;
 309                }
 310                strbuf_addch(&cf->value, c);
 311        }
 312}
 313
 314static inline int iskeychar(int c)
 315{
 316        return isalnum(c) || c == '-';
 317}
 318
 319static int get_value(config_fn_t fn, void *data, struct strbuf *name)
 320{
 321        int c;
 322        char *value;
 323        int ret;
 324
 325        /* Get the full name */
 326        for (;;) {
 327                c = get_next_char();
 328                if (cf->eof)
 329                        break;
 330                if (!iskeychar(c))
 331                        break;
 332                strbuf_addch(name, tolower(c));
 333        }
 334
 335        while (c == ' ' || c == '\t')
 336                c = get_next_char();
 337
 338        value = NULL;
 339        if (c != '\n') {
 340                if (c != '=')
 341                        return -1;
 342                value = parse_value();
 343                if (!value)
 344                        return -1;
 345        }
 346        /*
 347         * We already consumed the \n, but we need linenr to point to
 348         * the line we just parsed during the call to fn to get
 349         * accurate line number in error messages.
 350         */
 351        cf->linenr--;
 352        ret = fn(name->buf, value, data);
 353        cf->linenr++;
 354        return ret;
 355}
 356
 357static int get_extended_base_var(struct strbuf *name, int c)
 358{
 359        do {
 360                if (c == '\n')
 361                        goto error_incomplete_line;
 362                c = get_next_char();
 363        } while (isspace(c));
 364
 365        /* We require the format to be '[base "extension"]' */
 366        if (c != '"')
 367                return -1;
 368        strbuf_addch(name, '.');
 369
 370        for (;;) {
 371                int c = get_next_char();
 372                if (c == '\n')
 373                        goto error_incomplete_line;
 374                if (c == '"')
 375                        break;
 376                if (c == '\\') {
 377                        c = get_next_char();
 378                        if (c == '\n')
 379                                goto error_incomplete_line;
 380                }
 381                strbuf_addch(name, c);
 382        }
 383
 384        /* Final ']' */
 385        if (get_next_char() != ']')
 386                return -1;
 387        return 0;
 388error_incomplete_line:
 389        cf->linenr--;
 390        return -1;
 391}
 392
 393static int get_base_var(struct strbuf *name)
 394{
 395        for (;;) {
 396                int c = get_next_char();
 397                if (cf->eof)
 398                        return -1;
 399                if (c == ']')
 400                        return 0;
 401                if (isspace(c))
 402                        return get_extended_base_var(name, c);
 403                if (!iskeychar(c) && c != '.')
 404                        return -1;
 405                strbuf_addch(name, tolower(c));
 406        }
 407}
 408
 409static int git_parse_source(config_fn_t fn, void *data)
 410{
 411        int comment = 0;
 412        int baselen = 0;
 413        struct strbuf *var = &cf->var;
 414
 415        /* U+FEFF Byte Order Mark in UTF8 */
 416        static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 417        const unsigned char *bomptr = utf8_bom;
 418
 419        for (;;) {
 420                int c = get_next_char();
 421                if (bomptr && *bomptr) {
 422                        /* We are at the file beginning; skip UTF8-encoded BOM
 423                         * if present. Sane editors won't put this in on their
 424                         * own, but e.g. Windows Notepad will do it happily. */
 425                        if ((unsigned char) c == *bomptr) {
 426                                bomptr++;
 427                                continue;
 428                        } else {
 429                                /* Do not tolerate partial BOM. */
 430                                if (bomptr != utf8_bom)
 431                                        break;
 432                                /* No BOM at file beginning. Cool. */
 433                                bomptr = NULL;
 434                        }
 435                }
 436                if (c == '\n') {
 437                        if (cf->eof)
 438                                return 0;
 439                        comment = 0;
 440                        continue;
 441                }
 442                if (comment || isspace(c))
 443                        continue;
 444                if (c == '#' || c == ';') {
 445                        comment = 1;
 446                        continue;
 447                }
 448                if (c == '[') {
 449                        /* Reset prior to determining a new stem */
 450                        strbuf_reset(var);
 451                        if (get_base_var(var) < 0 || var->len < 1)
 452                                break;
 453                        strbuf_addch(var, '.');
 454                        baselen = var->len;
 455                        continue;
 456                }
 457                if (!isalpha(c))
 458                        break;
 459                /*
 460                 * Truncate the var name back to the section header
 461                 * stem prior to grabbing the suffix part of the name
 462                 * and the value.
 463                 */
 464                strbuf_setlen(var, baselen);
 465                strbuf_addch(var, tolower(c));
 466                if (get_value(fn, data, var) < 0)
 467                        break;
 468        }
 469        if (cf->die_on_error)
 470                die(_("bad config file line %d in %s"), cf->linenr, cf->name);
 471        else
 472                return error(_("bad config file line %d in %s"), cf->linenr, cf->name);
 473}
 474
 475static int parse_unit_factor(const char *end, uintmax_t *val)
 476{
 477        if (!*end)
 478                return 1;
 479        else if (!strcasecmp(end, "k")) {
 480                *val *= 1024;
 481                return 1;
 482        }
 483        else if (!strcasecmp(end, "m")) {
 484                *val *= 1024 * 1024;
 485                return 1;
 486        }
 487        else if (!strcasecmp(end, "g")) {
 488                *val *= 1024 * 1024 * 1024;
 489                return 1;
 490        }
 491        return 0;
 492}
 493
 494static int git_parse_signed(const char *value, intmax_t *ret, intmax_t max)
 495{
 496        if (value && *value) {
 497                char *end;
 498                intmax_t val;
 499                uintmax_t uval;
 500                uintmax_t factor = 1;
 501
 502                errno = 0;
 503                val = strtoimax(value, &end, 0);
 504                if (errno == ERANGE)
 505                        return 0;
 506                if (!parse_unit_factor(end, &factor)) {
 507                        errno = EINVAL;
 508                        return 0;
 509                }
 510                uval = abs(val);
 511                uval *= factor;
 512                if (uval > max || abs(val) > uval) {
 513                        errno = ERANGE;
 514                        return 0;
 515                }
 516                val *= factor;
 517                *ret = val;
 518                return 1;
 519        }
 520        errno = EINVAL;
 521        return 0;
 522}
 523
 524static int git_parse_unsigned(const char *value, uintmax_t *ret, uintmax_t max)
 525{
 526        if (value && *value) {
 527                char *end;
 528                uintmax_t val;
 529                uintmax_t oldval;
 530
 531                errno = 0;
 532                val = strtoumax(value, &end, 0);
 533                if (errno == ERANGE)
 534                        return 0;
 535                oldval = val;
 536                if (!parse_unit_factor(end, &val)) {
 537                        errno = EINVAL;
 538                        return 0;
 539                }
 540                if (val > max || oldval > val) {
 541                        errno = ERANGE;
 542                        return 0;
 543                }
 544                *ret = val;
 545                return 1;
 546        }
 547        errno = EINVAL;
 548        return 0;
 549}
 550
 551static int git_parse_int(const char *value, int *ret)
 552{
 553        intmax_t tmp;
 554        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int)))
 555                return 0;
 556        *ret = tmp;
 557        return 1;
 558}
 559
 560static int git_parse_int64(const char *value, int64_t *ret)
 561{
 562        intmax_t tmp;
 563        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int64_t)))
 564                return 0;
 565        *ret = tmp;
 566        return 1;
 567}
 568
 569int git_parse_ulong(const char *value, unsigned long *ret)
 570{
 571        uintmax_t tmp;
 572        if (!git_parse_unsigned(value, &tmp, maximum_unsigned_value_of_type(long)))
 573                return 0;
 574        *ret = tmp;
 575        return 1;
 576}
 577
 578NORETURN
 579static void die_bad_number(const char *name, const char *value)
 580{
 581        const char *reason = errno == ERANGE ?
 582                             "out of range" :
 583                             "invalid unit";
 584        if (!value)
 585                value = "";
 586
 587        if (cf && cf->name)
 588                die(_("bad numeric config value '%s' for '%s' in %s: %s"),
 589                    value, name, cf->name, reason);
 590        die(_("bad numeric config value '%s' for '%s': %s"), value, name, reason);
 591}
 592
 593int git_config_int(const char *name, const char *value)
 594{
 595        int ret;
 596        if (!git_parse_int(value, &ret))
 597                die_bad_number(name, value);
 598        return ret;
 599}
 600
 601int64_t git_config_int64(const char *name, const char *value)
 602{
 603        int64_t ret;
 604        if (!git_parse_int64(value, &ret))
 605                die_bad_number(name, value);
 606        return ret;
 607}
 608
 609unsigned long git_config_ulong(const char *name, const char *value)
 610{
 611        unsigned long ret;
 612        if (!git_parse_ulong(value, &ret))
 613                die_bad_number(name, value);
 614        return ret;
 615}
 616
 617static int git_config_maybe_bool_text(const char *name, const char *value)
 618{
 619        if (!value)
 620                return 1;
 621        if (!*value)
 622                return 0;
 623        if (!strcasecmp(value, "true")
 624            || !strcasecmp(value, "yes")
 625            || !strcasecmp(value, "on"))
 626                return 1;
 627        if (!strcasecmp(value, "false")
 628            || !strcasecmp(value, "no")
 629            || !strcasecmp(value, "off"))
 630                return 0;
 631        return -1;
 632}
 633
 634int git_config_maybe_bool(const char *name, const char *value)
 635{
 636        int v = git_config_maybe_bool_text(name, value);
 637        if (0 <= v)
 638                return v;
 639        if (git_parse_int(value, &v))
 640                return !!v;
 641        return -1;
 642}
 643
 644int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 645{
 646        int v = git_config_maybe_bool_text(name, value);
 647        if (0 <= v) {
 648                *is_bool = 1;
 649                return v;
 650        }
 651        *is_bool = 0;
 652        return git_config_int(name, value);
 653}
 654
 655int git_config_bool(const char *name, const char *value)
 656{
 657        int discard;
 658        return !!git_config_bool_or_int(name, value, &discard);
 659}
 660
 661int git_config_string(const char **dest, const char *var, const char *value)
 662{
 663        if (!value)
 664                return config_error_nonbool(var);
 665        *dest = xstrdup(value);
 666        return 0;
 667}
 668
 669int git_config_pathname(const char **dest, const char *var, const char *value)
 670{
 671        if (!value)
 672                return config_error_nonbool(var);
 673        *dest = expand_user_path(value);
 674        if (!*dest)
 675                die(_("failed to expand user dir in: '%s'"), value);
 676        return 0;
 677}
 678
 679static int git_default_core_config(const char *var, const char *value)
 680{
 681        /* This needs a better name */
 682        if (!strcmp(var, "core.filemode")) {
 683                trust_executable_bit = git_config_bool(var, value);
 684                return 0;
 685        }
 686        if (!strcmp(var, "core.trustctime")) {
 687                trust_ctime = git_config_bool(var, value);
 688                return 0;
 689        }
 690        if (!strcmp(var, "core.checkstat")) {
 691                if (!strcasecmp(value, "default"))
 692                        check_stat = 1;
 693                else if (!strcasecmp(value, "minimal"))
 694                        check_stat = 0;
 695        }
 696
 697        if (!strcmp(var, "core.quotepath")) {
 698                quote_path_fully = git_config_bool(var, value);
 699                return 0;
 700        }
 701
 702        if (!strcmp(var, "core.symlinks")) {
 703                has_symlinks = git_config_bool(var, value);
 704                return 0;
 705        }
 706
 707        if (!strcmp(var, "core.ignorecase")) {
 708                ignore_case = git_config_bool(var, value);
 709                return 0;
 710        }
 711
 712        if (!strcmp(var, "core.attributesfile"))
 713                return git_config_pathname(&git_attributes_file, var, value);
 714
 715        if (!strcmp(var, "core.bare")) {
 716                is_bare_repository_cfg = git_config_bool(var, value);
 717                return 0;
 718        }
 719
 720        if (!strcmp(var, "core.ignorestat")) {
 721                assume_unchanged = git_config_bool(var, value);
 722                return 0;
 723        }
 724
 725        if (!strcmp(var, "core.prefersymlinkrefs")) {
 726                prefer_symlink_refs = git_config_bool(var, value);
 727                return 0;
 728        }
 729
 730        if (!strcmp(var, "core.logallrefupdates")) {
 731                log_all_ref_updates = git_config_bool(var, value);
 732                return 0;
 733        }
 734
 735        if (!strcmp(var, "core.warnambiguousrefs")) {
 736                warn_ambiguous_refs = git_config_bool(var, value);
 737                return 0;
 738        }
 739
 740        if (!strcmp(var, "core.abbrev")) {
 741                int abbrev = git_config_int(var, value);
 742                if (abbrev < minimum_abbrev || abbrev > 40)
 743                        return -1;
 744                default_abbrev = abbrev;
 745                return 0;
 746        }
 747
 748        if (!strcmp(var, "core.loosecompression")) {
 749                int level = git_config_int(var, value);
 750                if (level == -1)
 751                        level = Z_DEFAULT_COMPRESSION;
 752                else if (level < 0 || level > Z_BEST_COMPRESSION)
 753                        die(_("bad zlib compression level %d"), level);
 754                zlib_compression_level = level;
 755                zlib_compression_seen = 1;
 756                return 0;
 757        }
 758
 759        if (!strcmp(var, "core.compression")) {
 760                int level = git_config_int(var, value);
 761                if (level == -1)
 762                        level = Z_DEFAULT_COMPRESSION;
 763                else if (level < 0 || level > Z_BEST_COMPRESSION)
 764                        die(_("bad zlib compression level %d"), level);
 765                core_compression_level = level;
 766                core_compression_seen = 1;
 767                if (!zlib_compression_seen)
 768                        zlib_compression_level = level;
 769                return 0;
 770        }
 771
 772        if (!strcmp(var, "core.packedgitwindowsize")) {
 773                int pgsz_x2 = getpagesize() * 2;
 774                packed_git_window_size = git_config_ulong(var, value);
 775
 776                /* This value must be multiple of (pagesize * 2) */
 777                packed_git_window_size /= pgsz_x2;
 778                if (packed_git_window_size < 1)
 779                        packed_git_window_size = 1;
 780                packed_git_window_size *= pgsz_x2;
 781                return 0;
 782        }
 783
 784        if (!strcmp(var, "core.bigfilethreshold")) {
 785                big_file_threshold = git_config_ulong(var, value);
 786                return 0;
 787        }
 788
 789        if (!strcmp(var, "core.packedgitlimit")) {
 790                packed_git_limit = git_config_ulong(var, value);
 791                return 0;
 792        }
 793
 794        if (!strcmp(var, "core.deltabasecachelimit")) {
 795                delta_base_cache_limit = git_config_ulong(var, value);
 796                return 0;
 797        }
 798
 799        if (!strcmp(var, "core.autocrlf")) {
 800                if (value && !strcasecmp(value, "input")) {
 801                        if (core_eol == EOL_CRLF)
 802                                return error("core.autocrlf=input conflicts with core.eol=crlf");
 803                        auto_crlf = AUTO_CRLF_INPUT;
 804                        return 0;
 805                }
 806                auto_crlf = git_config_bool(var, value);
 807                return 0;
 808        }
 809
 810        if (!strcmp(var, "core.safecrlf")) {
 811                if (value && !strcasecmp(value, "warn")) {
 812                        safe_crlf = SAFE_CRLF_WARN;
 813                        return 0;
 814                }
 815                safe_crlf = git_config_bool(var, value);
 816                return 0;
 817        }
 818
 819        if (!strcmp(var, "core.eol")) {
 820                if (value && !strcasecmp(value, "lf"))
 821                        core_eol = EOL_LF;
 822                else if (value && !strcasecmp(value, "crlf"))
 823                        core_eol = EOL_CRLF;
 824                else if (value && !strcasecmp(value, "native"))
 825                        core_eol = EOL_NATIVE;
 826                else
 827                        core_eol = EOL_UNSET;
 828                if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 829                        return error("core.autocrlf=input conflicts with core.eol=crlf");
 830                return 0;
 831        }
 832
 833        if (!strcmp(var, "core.notesref")) {
 834                notes_ref_name = xstrdup(value);
 835                return 0;
 836        }
 837
 838        if (!strcmp(var, "core.pager"))
 839                return git_config_string(&pager_program, var, value);
 840
 841        if (!strcmp(var, "core.editor"))
 842                return git_config_string(&editor_program, var, value);
 843
 844        if (!strcmp(var, "core.commentchar")) {
 845                const char *comment;
 846                int ret = git_config_string(&comment, var, value);
 847                if (ret)
 848                        return ret;
 849                else if (!strcasecmp(comment, "auto"))
 850                        auto_comment_line_char = 1;
 851                else if (comment[0] && !comment[1]) {
 852                        comment_line_char = comment[0];
 853                        auto_comment_line_char = 0;
 854                } else
 855                        return error("core.commentChar should only be one character");
 856                return 0;
 857        }
 858
 859        if (!strcmp(var, "core.askpass"))
 860                return git_config_string(&askpass_program, var, value);
 861
 862        if (!strcmp(var, "core.excludesfile"))
 863                return git_config_pathname(&excludes_file, var, value);
 864
 865        if (!strcmp(var, "core.whitespace")) {
 866                if (!value)
 867                        return config_error_nonbool(var);
 868                whitespace_rule_cfg = parse_whitespace_rule(value);
 869                return 0;
 870        }
 871
 872        if (!strcmp(var, "core.fsyncobjectfiles")) {
 873                fsync_object_files = git_config_bool(var, value);
 874                return 0;
 875        }
 876
 877        if (!strcmp(var, "core.preloadindex")) {
 878                core_preload_index = git_config_bool(var, value);
 879                return 0;
 880        }
 881
 882        if (!strcmp(var, "core.createobject")) {
 883                if (!strcmp(value, "rename"))
 884                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 885                else if (!strcmp(value, "link"))
 886                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 887                else
 888                        die(_("invalid mode for object creation: %s"), value);
 889                return 0;
 890        }
 891
 892        if (!strcmp(var, "core.sparsecheckout")) {
 893                core_apply_sparse_checkout = git_config_bool(var, value);
 894                return 0;
 895        }
 896
 897        if (!strcmp(var, "core.precomposeunicode")) {
 898                precomposed_unicode = git_config_bool(var, value);
 899                return 0;
 900        }
 901
 902        /* Add other config variables here and to Documentation/config.txt. */
 903        return 0;
 904}
 905
 906static int git_default_i18n_config(const char *var, const char *value)
 907{
 908        if (!strcmp(var, "i18n.commitencoding"))
 909                return git_config_string(&git_commit_encoding, var, value);
 910
 911        if (!strcmp(var, "i18n.logoutputencoding"))
 912                return git_config_string(&git_log_output_encoding, var, value);
 913
 914        /* Add other config variables here and to Documentation/config.txt. */
 915        return 0;
 916}
 917
 918static int git_default_branch_config(const char *var, const char *value)
 919{
 920        if (!strcmp(var, "branch.autosetupmerge")) {
 921                if (value && !strcasecmp(value, "always")) {
 922                        git_branch_track = BRANCH_TRACK_ALWAYS;
 923                        return 0;
 924                }
 925                git_branch_track = git_config_bool(var, value);
 926                return 0;
 927        }
 928        if (!strcmp(var, "branch.autosetuprebase")) {
 929                if (!value)
 930                        return config_error_nonbool(var);
 931                else if (!strcmp(value, "never"))
 932                        autorebase = AUTOREBASE_NEVER;
 933                else if (!strcmp(value, "local"))
 934                        autorebase = AUTOREBASE_LOCAL;
 935                else if (!strcmp(value, "remote"))
 936                        autorebase = AUTOREBASE_REMOTE;
 937                else if (!strcmp(value, "always"))
 938                        autorebase = AUTOREBASE_ALWAYS;
 939                else
 940                        return error("Malformed value for %s", var);
 941                return 0;
 942        }
 943
 944        /* Add other config variables here and to Documentation/config.txt. */
 945        return 0;
 946}
 947
 948static int git_default_push_config(const char *var, const char *value)
 949{
 950        if (!strcmp(var, "push.default")) {
 951                if (!value)
 952                        return config_error_nonbool(var);
 953                else if (!strcmp(value, "nothing"))
 954                        push_default = PUSH_DEFAULT_NOTHING;
 955                else if (!strcmp(value, "matching"))
 956                        push_default = PUSH_DEFAULT_MATCHING;
 957                else if (!strcmp(value, "simple"))
 958                        push_default = PUSH_DEFAULT_SIMPLE;
 959                else if (!strcmp(value, "upstream"))
 960                        push_default = PUSH_DEFAULT_UPSTREAM;
 961                else if (!strcmp(value, "tracking")) /* deprecated */
 962                        push_default = PUSH_DEFAULT_UPSTREAM;
 963                else if (!strcmp(value, "current"))
 964                        push_default = PUSH_DEFAULT_CURRENT;
 965                else {
 966                        error("Malformed value for %s: %s", var, value);
 967                        return error("Must be one of nothing, matching, simple, "
 968                                     "upstream or current.");
 969                }
 970                return 0;
 971        }
 972
 973        /* Add other config variables here and to Documentation/config.txt. */
 974        return 0;
 975}
 976
 977static int git_default_mailmap_config(const char *var, const char *value)
 978{
 979        if (!strcmp(var, "mailmap.file"))
 980                return git_config_pathname(&git_mailmap_file, var, value);
 981        if (!strcmp(var, "mailmap.blob"))
 982                return git_config_string(&git_mailmap_blob, var, value);
 983
 984        /* Add other config variables here and to Documentation/config.txt. */
 985        return 0;
 986}
 987
 988int git_default_config(const char *var, const char *value, void *dummy)
 989{
 990        if (starts_with(var, "core."))
 991                return git_default_core_config(var, value);
 992
 993        if (starts_with(var, "user."))
 994                return git_ident_config(var, value, dummy);
 995
 996        if (starts_with(var, "i18n."))
 997                return git_default_i18n_config(var, value);
 998
 999        if (starts_with(var, "branch."))
1000                return git_default_branch_config(var, value);
1001
1002        if (starts_with(var, "push."))
1003                return git_default_push_config(var, value);
1004
1005        if (starts_with(var, "mailmap."))
1006                return git_default_mailmap_config(var, value);
1007
1008        if (starts_with(var, "advice."))
1009                return git_default_advice_config(var, value);
1010
1011        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
1012                pager_use_color = git_config_bool(var,value);
1013                return 0;
1014        }
1015
1016        if (!strcmp(var, "pack.packsizelimit")) {
1017                pack_size_limit_cfg = git_config_ulong(var, value);
1018                return 0;
1019        }
1020        /* Add other config variables here and to Documentation/config.txt. */
1021        return 0;
1022}
1023
1024/*
1025 * All source specific fields in the union, die_on_error, name and the callbacks
1026 * fgetc, ungetc, ftell of top need to be initialized before calling
1027 * this function.
1028 */
1029static int do_config_from(struct config_source *top, config_fn_t fn, void *data)
1030{
1031        int ret;
1032
1033        /* push config-file parsing state stack */
1034        top->prev = cf;
1035        top->linenr = 1;
1036        top->eof = 0;
1037        strbuf_init(&top->value, 1024);
1038        strbuf_init(&top->var, 1024);
1039        cf = top;
1040
1041        ret = git_parse_source(fn, data);
1042
1043        /* pop config-file parsing state stack */
1044        strbuf_release(&top->value);
1045        strbuf_release(&top->var);
1046        cf = top->prev;
1047
1048        return ret;
1049}
1050
1051static int do_config_from_file(config_fn_t fn,
1052                const char *name, const char *path, FILE *f, void *data)
1053{
1054        struct config_source top;
1055
1056        top.u.file = f;
1057        top.name = name;
1058        top.path = path;
1059        top.die_on_error = 1;
1060        top.do_fgetc = config_file_fgetc;
1061        top.do_ungetc = config_file_ungetc;
1062        top.do_ftell = config_file_ftell;
1063
1064        return do_config_from(&top, fn, data);
1065}
1066
1067static int git_config_from_stdin(config_fn_t fn, void *data)
1068{
1069        return do_config_from_file(fn, "<stdin>", NULL, stdin, data);
1070}
1071
1072int git_config_from_file(config_fn_t fn, const char *filename, void *data)
1073{
1074        int ret = -1;
1075        FILE *f;
1076
1077        f = fopen(filename, "r");
1078        if (f) {
1079                ret = do_config_from_file(fn, filename, filename, f, data);
1080                fclose(f);
1081        }
1082        return ret;
1083}
1084
1085int git_config_from_buf(config_fn_t fn, const char *name, const char *buf,
1086                        size_t len, void *data)
1087{
1088        struct config_source top;
1089
1090        top.u.buf.buf = buf;
1091        top.u.buf.len = len;
1092        top.u.buf.pos = 0;
1093        top.name = name;
1094        top.path = NULL;
1095        top.die_on_error = 0;
1096        top.do_fgetc = config_buf_fgetc;
1097        top.do_ungetc = config_buf_ungetc;
1098        top.do_ftell = config_buf_ftell;
1099
1100        return do_config_from(&top, fn, data);
1101}
1102
1103static int git_config_from_blob_sha1(config_fn_t fn,
1104                                     const char *name,
1105                                     const unsigned char *sha1,
1106                                     void *data)
1107{
1108        enum object_type type;
1109        char *buf;
1110        unsigned long size;
1111        int ret;
1112
1113        buf = read_sha1_file(sha1, &type, &size);
1114        if (!buf)
1115                return error("unable to load config blob object '%s'", name);
1116        if (type != OBJ_BLOB) {
1117                free(buf);
1118                return error("reference '%s' does not point to a blob", name);
1119        }
1120
1121        ret = git_config_from_buf(fn, name, buf, size, data);
1122        free(buf);
1123
1124        return ret;
1125}
1126
1127static int git_config_from_blob_ref(config_fn_t fn,
1128                                    const char *name,
1129                                    void *data)
1130{
1131        unsigned char sha1[20];
1132
1133        if (get_sha1(name, sha1) < 0)
1134                return error("unable to resolve config blob '%s'", name);
1135        return git_config_from_blob_sha1(fn, name, sha1, data);
1136}
1137
1138const char *git_etc_gitconfig(void)
1139{
1140        static const char *system_wide;
1141        if (!system_wide)
1142                system_wide = system_path(ETC_GITCONFIG);
1143        return system_wide;
1144}
1145
1146int git_env_bool(const char *k, int def)
1147{
1148        const char *v = getenv(k);
1149        return v ? git_config_bool(k, v) : def;
1150}
1151
1152int git_config_system(void)
1153{
1154        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
1155}
1156
1157int git_config_early(config_fn_t fn, void *data, const char *repo_config)
1158{
1159        int ret = 0, found = 0;
1160        char *xdg_config = NULL;
1161        char *user_config = NULL;
1162
1163        home_config_paths(&user_config, &xdg_config, "config");
1164
1165        if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0)) {
1166                ret += git_config_from_file(fn, git_etc_gitconfig(),
1167                                            data);
1168                found += 1;
1169        }
1170
1171        if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK)) {
1172                ret += git_config_from_file(fn, xdg_config, data);
1173                found += 1;
1174        }
1175
1176        if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK)) {
1177                ret += git_config_from_file(fn, user_config, data);
1178                found += 1;
1179        }
1180
1181        if (repo_config && !access_or_die(repo_config, R_OK, 0)) {
1182                ret += git_config_from_file(fn, repo_config, data);
1183                found += 1;
1184        }
1185
1186        switch (git_config_from_parameters(fn, data)) {
1187        case -1: /* error */
1188                die(_("unable to parse command-line config"));
1189                break;
1190        case 0: /* found nothing */
1191                break;
1192        default: /* found at least one item */
1193                found++;
1194                break;
1195        }
1196
1197        free(xdg_config);
1198        free(user_config);
1199        return ret == 0 ? found : ret;
1200}
1201
1202int git_config_with_options(config_fn_t fn, void *data,
1203                            struct git_config_source *config_source,
1204                            int respect_includes)
1205{
1206        char *repo_config = NULL;
1207        int ret;
1208        struct config_include_data inc = CONFIG_INCLUDE_INIT;
1209
1210        if (respect_includes) {
1211                inc.fn = fn;
1212                inc.data = data;
1213                fn = git_config_include;
1214                data = &inc;
1215        }
1216
1217        /*
1218         * If we have a specific filename, use it. Otherwise, follow the
1219         * regular lookup sequence.
1220         */
1221        if (config_source && config_source->use_stdin)
1222                return git_config_from_stdin(fn, data);
1223        else if (config_source && config_source->file)
1224                return git_config_from_file(fn, config_source->file, data);
1225        else if (config_source && config_source->blob)
1226                return git_config_from_blob_ref(fn, config_source->blob, data);
1227
1228        repo_config = git_pathdup("config");
1229        ret = git_config_early(fn, data, repo_config);
1230        if (repo_config)
1231                free(repo_config);
1232        return ret;
1233}
1234
1235int git_config(config_fn_t fn, void *data)
1236{
1237        return git_config_with_options(fn, data, NULL, 1);
1238}
1239
1240static struct config_set_element *configset_find_element(struct config_set *cs, const char *key)
1241{
1242        struct config_set_element k;
1243        struct config_set_element *found_entry;
1244        char *normalized_key;
1245        int ret;
1246        /*
1247         * `key` may come from the user, so normalize it before using it
1248         * for querying entries from the hashmap.
1249         */
1250        ret = git_config_parse_key(key, &normalized_key, NULL);
1251
1252        if (ret)
1253                return NULL;
1254
1255        hashmap_entry_init(&k, strhash(normalized_key));
1256        k.key = normalized_key;
1257        found_entry = hashmap_get(&cs->config_hash, &k, NULL);
1258        free(normalized_key);
1259        return found_entry;
1260}
1261
1262static int configset_add_value(struct config_set *cs, const char *key, const char *value)
1263{
1264        struct config_set_element *e;
1265        e = configset_find_element(cs, key);
1266        /*
1267         * Since the keys are being fed by git_config*() callback mechanism, they
1268         * are already normalized. So simply add them without any further munging.
1269         */
1270        if (!e) {
1271                e = xmalloc(sizeof(*e));
1272                hashmap_entry_init(e, strhash(key));
1273                e->key = xstrdup(key);
1274                string_list_init(&e->value_list, 1);
1275                hashmap_add(&cs->config_hash, e);
1276        }
1277        string_list_append_nodup(&e->value_list, value ? xstrdup(value) : NULL);
1278
1279        return 0;
1280}
1281
1282static int config_set_element_cmp(const struct config_set_element *e1,
1283                                 const struct config_set_element *e2, const void *unused)
1284{
1285        return strcmp(e1->key, e2->key);
1286}
1287
1288void git_configset_init(struct config_set *cs)
1289{
1290        hashmap_init(&cs->config_hash, (hashmap_cmp_fn)config_set_element_cmp, 0);
1291        cs->hash_initialized = 1;
1292}
1293
1294void git_configset_clear(struct config_set *cs)
1295{
1296        struct config_set_element *entry;
1297        struct hashmap_iter iter;
1298        if (!cs->hash_initialized)
1299                return;
1300
1301        hashmap_iter_init(&cs->config_hash, &iter);
1302        while ((entry = hashmap_iter_next(&iter))) {
1303                free(entry->key);
1304                string_list_clear(&entry->value_list, 0);
1305        }
1306        hashmap_free(&cs->config_hash, 1);
1307        cs->hash_initialized = 0;
1308}
1309
1310static int config_set_callback(const char *key, const char *value, void *cb)
1311{
1312        struct config_set *cs = cb;
1313        configset_add_value(cs, key, value);
1314        return 0;
1315}
1316
1317int git_configset_add_file(struct config_set *cs, const char *filename)
1318{
1319        return git_config_from_file(config_set_callback, filename, cs);
1320}
1321
1322int git_configset_get_value(struct config_set *cs, const char *key, const char **value)
1323{
1324        const struct string_list *values = NULL;
1325        /*
1326         * Follows "last one wins" semantic, i.e., if there are multiple matches for the
1327         * queried key in the files of the configset, the value returned will be the last
1328         * value in the value list for that key.
1329         */
1330        values = git_configset_get_value_multi(cs, key);
1331
1332        if (!values)
1333                return 1;
1334        assert(values->nr > 0);
1335        *value = values->items[values->nr - 1].string;
1336        return 0;
1337}
1338
1339const struct string_list *git_configset_get_value_multi(struct config_set *cs, const char *key)
1340{
1341        struct config_set_element *e = configset_find_element(cs, key);
1342        return e ? &e->value_list : NULL;
1343}
1344
1345int git_configset_get_string_const(struct config_set *cs, const char *key, const char **dest)
1346{
1347        const char *value;
1348        if (!git_configset_get_value(cs, key, &value))
1349                return git_config_string(dest, key, value);
1350        else
1351                return 1;
1352}
1353
1354int git_configset_get_string(struct config_set *cs, const char *key, char **dest)
1355{
1356        return git_configset_get_string_const(cs, key, (const char **)dest);
1357}
1358
1359int git_configset_get_int(struct config_set *cs, const char *key, int *dest)
1360{
1361        const char *value;
1362        if (!git_configset_get_value(cs, key, &value)) {
1363                *dest = git_config_int(key, value);
1364                return 0;
1365        } else
1366                return 1;
1367}
1368
1369int git_configset_get_ulong(struct config_set *cs, const char *key, unsigned long *dest)
1370{
1371        const char *value;
1372        if (!git_configset_get_value(cs, key, &value)) {
1373                *dest = git_config_ulong(key, value);
1374                return 0;
1375        } else
1376                return 1;
1377}
1378
1379int git_configset_get_bool(struct config_set *cs, const char *key, int *dest)
1380{
1381        const char *value;
1382        if (!git_configset_get_value(cs, key, &value)) {
1383                *dest = git_config_bool(key, value);
1384                return 0;
1385        } else
1386                return 1;
1387}
1388
1389int git_configset_get_bool_or_int(struct config_set *cs, const char *key,
1390                                int *is_bool, int *dest)
1391{
1392        const char *value;
1393        if (!git_configset_get_value(cs, key, &value)) {
1394                *dest = git_config_bool_or_int(key, value, is_bool);
1395                return 0;
1396        } else
1397                return 1;
1398}
1399
1400int git_configset_get_maybe_bool(struct config_set *cs, const char *key, int *dest)
1401{
1402        const char *value;
1403        if (!git_configset_get_value(cs, key, &value)) {
1404                *dest = git_config_maybe_bool(key, value);
1405                if (*dest == -1)
1406                        return -1;
1407                return 0;
1408        } else
1409                return 1;
1410}
1411
1412int git_configset_get_pathname(struct config_set *cs, const char *key, const char **dest)
1413{
1414        const char *value;
1415        if (!git_configset_get_value(cs, key, &value))
1416                return git_config_pathname(dest, key, value);
1417        else
1418                return 1;
1419}
1420
1421static void git_config_check_init(void)
1422{
1423        if (the_config_set.hash_initialized)
1424                return;
1425        git_configset_init(&the_config_set);
1426        git_config(config_set_callback, &the_config_set);
1427}
1428
1429void git_config_clear(void)
1430{
1431        if (!the_config_set.hash_initialized)
1432                return;
1433        git_configset_clear(&the_config_set);
1434}
1435
1436int git_config_get_value(const char *key, const char **value)
1437{
1438        git_config_check_init();
1439        return git_configset_get_value(&the_config_set, key, value);
1440}
1441
1442const struct string_list *git_config_get_value_multi(const char *key)
1443{
1444        git_config_check_init();
1445        return git_configset_get_value_multi(&the_config_set, key);
1446}
1447
1448int git_config_get_string_const(const char *key, const char **dest)
1449{
1450        git_config_check_init();
1451        return git_configset_get_string_const(&the_config_set, key, dest);
1452}
1453
1454int git_config_get_string(const char *key, char **dest)
1455{
1456        git_config_check_init();
1457        return git_config_get_string_const(key, (const char **)dest);
1458}
1459
1460int git_config_get_int(const char *key, int *dest)
1461{
1462        git_config_check_init();
1463        return git_configset_get_int(&the_config_set, key, dest);
1464}
1465
1466int git_config_get_ulong(const char *key, unsigned long *dest)
1467{
1468        git_config_check_init();
1469        return git_configset_get_ulong(&the_config_set, key, dest);
1470}
1471
1472int git_config_get_bool(const char *key, int *dest)
1473{
1474        git_config_check_init();
1475        return git_configset_get_bool(&the_config_set, key, dest);
1476}
1477
1478int git_config_get_bool_or_int(const char *key, int *is_bool, int *dest)
1479{
1480        git_config_check_init();
1481        return git_configset_get_bool_or_int(&the_config_set, key, is_bool, dest);
1482}
1483
1484int git_config_get_maybe_bool(const char *key, int *dest)
1485{
1486        git_config_check_init();
1487        return git_configset_get_maybe_bool(&the_config_set, key, dest);
1488}
1489
1490int git_config_get_pathname(const char *key, const char **dest)
1491{
1492        git_config_check_init();
1493        return git_configset_get_pathname(&the_config_set, key, dest);
1494}
1495
1496/*
1497 * Find all the stuff for git_config_set() below.
1498 */
1499
1500static struct {
1501        int baselen;
1502        char *key;
1503        int do_not_match;
1504        regex_t *value_regex;
1505        int multi_replace;
1506        size_t *offset;
1507        unsigned int offset_alloc;
1508        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1509        int seen;
1510} store;
1511
1512static int matches(const char *key, const char *value)
1513{
1514        return !strcmp(key, store.key) &&
1515                (store.value_regex == NULL ||
1516                 (store.do_not_match ^
1517                  !regexec(store.value_regex, value, 0, NULL, 0)));
1518}
1519
1520static int store_aux(const char *key, const char *value, void *cb)
1521{
1522        const char *ep;
1523        size_t section_len;
1524
1525        switch (store.state) {
1526        case KEY_SEEN:
1527                if (matches(key, value)) {
1528                        if (store.seen == 1 && store.multi_replace == 0) {
1529                                warning(_("%s has multiple values"), key);
1530                        }
1531
1532                        ALLOC_GROW(store.offset, store.seen + 1,
1533                                   store.offset_alloc);
1534
1535                        store.offset[store.seen] = cf->do_ftell(cf);
1536                        store.seen++;
1537                }
1538                break;
1539        case SECTION_SEEN:
1540                /*
1541                 * What we are looking for is in store.key (both
1542                 * section and var), and its section part is baselen
1543                 * long.  We found key (again, both section and var).
1544                 * We would want to know if this key is in the same
1545                 * section as what we are looking for.  We already
1546                 * know we are in the same section as what should
1547                 * hold store.key.
1548                 */
1549                ep = strrchr(key, '.');
1550                section_len = ep - key;
1551
1552                if ((section_len != store.baselen) ||
1553                    memcmp(key, store.key, section_len+1)) {
1554                        store.state = SECTION_END_SEEN;
1555                        break;
1556                }
1557
1558                /*
1559                 * Do not increment matches: this is no match, but we
1560                 * just made sure we are in the desired section.
1561                 */
1562                ALLOC_GROW(store.offset, store.seen + 1,
1563                           store.offset_alloc);
1564                store.offset[store.seen] = cf->do_ftell(cf);
1565                /* fallthru */
1566        case SECTION_END_SEEN:
1567        case START:
1568                if (matches(key, value)) {
1569                        ALLOC_GROW(store.offset, store.seen + 1,
1570                                   store.offset_alloc);
1571                        store.offset[store.seen] = cf->do_ftell(cf);
1572                        store.state = KEY_SEEN;
1573                        store.seen++;
1574                } else {
1575                        if (strrchr(key, '.') - key == store.baselen &&
1576                              !strncmp(key, store.key, store.baselen)) {
1577                                        store.state = SECTION_SEEN;
1578                                        ALLOC_GROW(store.offset,
1579                                                   store.seen + 1,
1580                                                   store.offset_alloc);
1581                                        store.offset[store.seen] = cf->do_ftell(cf);
1582                        }
1583                }
1584        }
1585        return 0;
1586}
1587
1588static int write_error(const char *filename)
1589{
1590        error("failed to write new configuration file %s", filename);
1591
1592        /* Same error code as "failed to rename". */
1593        return 4;
1594}
1595
1596static int store_write_section(int fd, const char *key)
1597{
1598        const char *dot;
1599        int i, success;
1600        struct strbuf sb = STRBUF_INIT;
1601
1602        dot = memchr(key, '.', store.baselen);
1603        if (dot) {
1604                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1605                for (i = dot - key + 1; i < store.baselen; i++) {
1606                        if (key[i] == '"' || key[i] == '\\')
1607                                strbuf_addch(&sb, '\\');
1608                        strbuf_addch(&sb, key[i]);
1609                }
1610                strbuf_addstr(&sb, "\"]\n");
1611        } else {
1612                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1613        }
1614
1615        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1616        strbuf_release(&sb);
1617
1618        return success;
1619}
1620
1621static int store_write_pair(int fd, const char *key, const char *value)
1622{
1623        int i, success;
1624        int length = strlen(key + store.baselen + 1);
1625        const char *quote = "";
1626        struct strbuf sb = STRBUF_INIT;
1627
1628        /*
1629         * Check to see if the value needs to be surrounded with a dq pair.
1630         * Note that problematic characters are always backslash-quoted; this
1631         * check is about not losing leading or trailing SP and strings that
1632         * follow beginning-of-comment characters (i.e. ';' and '#') by the
1633         * configuration parser.
1634         */
1635        if (value[0] == ' ')
1636                quote = "\"";
1637        for (i = 0; value[i]; i++)
1638                if (value[i] == ';' || value[i] == '#')
1639                        quote = "\"";
1640        if (i && value[i - 1] == ' ')
1641                quote = "\"";
1642
1643        strbuf_addf(&sb, "\t%.*s = %s",
1644                    length, key + store.baselen + 1, quote);
1645
1646        for (i = 0; value[i]; i++)
1647                switch (value[i]) {
1648                case '\n':
1649                        strbuf_addstr(&sb, "\\n");
1650                        break;
1651                case '\t':
1652                        strbuf_addstr(&sb, "\\t");
1653                        break;
1654                case '"':
1655                case '\\':
1656                        strbuf_addch(&sb, '\\');
1657                default:
1658                        strbuf_addch(&sb, value[i]);
1659                        break;
1660                }
1661        strbuf_addf(&sb, "%s\n", quote);
1662
1663        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1664        strbuf_release(&sb);
1665
1666        return success;
1667}
1668
1669static ssize_t find_beginning_of_line(const char *contents, size_t size,
1670        size_t offset_, int *found_bracket)
1671{
1672        size_t equal_offset = size, bracket_offset = size;
1673        ssize_t offset;
1674
1675contline:
1676        for (offset = offset_-2; offset > 0
1677                        && contents[offset] != '\n'; offset--)
1678                switch (contents[offset]) {
1679                        case '=': equal_offset = offset; break;
1680                        case ']': bracket_offset = offset; break;
1681                }
1682        if (offset > 0 && contents[offset-1] == '\\') {
1683                offset_ = offset;
1684                goto contline;
1685        }
1686        if (bracket_offset < equal_offset) {
1687                *found_bracket = 1;
1688                offset = bracket_offset+1;
1689        } else
1690                offset++;
1691
1692        return offset;
1693}
1694
1695int git_config_set_in_file(const char *config_filename,
1696                        const char *key, const char *value)
1697{
1698        return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1699}
1700
1701int git_config_set(const char *key, const char *value)
1702{
1703        return git_config_set_multivar(key, value, NULL, 0);
1704}
1705
1706/*
1707 * Auxiliary function to sanity-check and split the key into the section
1708 * identifier and variable name.
1709 *
1710 * Returns 0 on success, -1 when there is an invalid character in the key and
1711 * -2 if there is no section name in the key.
1712 *
1713 * store_key - pointer to char* which will hold a copy of the key with
1714 *             lowercase section and variable name
1715 * baselen - pointer to int which will hold the length of the
1716 *           section + subsection part, can be NULL
1717 */
1718int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1719{
1720        int i, dot, baselen;
1721        const char *last_dot = strrchr(key, '.');
1722
1723        /*
1724         * Since "key" actually contains the section name and the real
1725         * key name separated by a dot, we have to know where the dot is.
1726         */
1727
1728        if (last_dot == NULL || last_dot == key) {
1729                error("key does not contain a section: %s", key);
1730                return -CONFIG_NO_SECTION_OR_NAME;
1731        }
1732
1733        if (!last_dot[1]) {
1734                error("key does not contain variable name: %s", key);
1735                return -CONFIG_NO_SECTION_OR_NAME;
1736        }
1737
1738        baselen = last_dot - key;
1739        if (baselen_)
1740                *baselen_ = baselen;
1741
1742        /*
1743         * Validate the key and while at it, lower case it for matching.
1744         */
1745        *store_key = xmalloc(strlen(key) + 1);
1746
1747        dot = 0;
1748        for (i = 0; key[i]; i++) {
1749                unsigned char c = key[i];
1750                if (c == '.')
1751                        dot = 1;
1752                /* Leave the extended basename untouched.. */
1753                if (!dot || i > baselen) {
1754                        if (!iskeychar(c) ||
1755                            (i == baselen + 1 && !isalpha(c))) {
1756                                error("invalid key: %s", key);
1757                                goto out_free_ret_1;
1758                        }
1759                        c = tolower(c);
1760                } else if (c == '\n') {
1761                        error("invalid key (newline): %s", key);
1762                        goto out_free_ret_1;
1763                }
1764                (*store_key)[i] = c;
1765        }
1766        (*store_key)[i] = 0;
1767
1768        return 0;
1769
1770out_free_ret_1:
1771        free(*store_key);
1772        *store_key = NULL;
1773        return -CONFIG_INVALID_KEY;
1774}
1775
1776/*
1777 * If value==NULL, unset in (remove from) config,
1778 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1779 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1780 *     else all matching key/values (regardless how many) are removed,
1781 *     before the new pair is written.
1782 *
1783 * Returns 0 on success.
1784 *
1785 * This function does this:
1786 *
1787 * - it locks the config file by creating ".git/config.lock"
1788 *
1789 * - it then parses the config using store_aux() as validator to find
1790 *   the position on the key/value pair to replace. If it is to be unset,
1791 *   it must be found exactly once.
1792 *
1793 * - the config file is mmap()ed and the part before the match (if any) is
1794 *   written to the lock file, then the changed part and the rest.
1795 *
1796 * - the config file is removed and the lock file rename()d to it.
1797 *
1798 */
1799int git_config_set_multivar_in_file(const char *config_filename,
1800                                const char *key, const char *value,
1801                                const char *value_regex, int multi_replace)
1802{
1803        int fd = -1, in_fd;
1804        int ret;
1805        struct lock_file *lock = NULL;
1806        char *filename_buf = NULL;
1807
1808        /* parse-key returns negative; flip the sign to feed exit(3) */
1809        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1810        if (ret)
1811                goto out_free;
1812
1813        store.multi_replace = multi_replace;
1814
1815        if (!config_filename)
1816                config_filename = filename_buf = git_pathdup("config");
1817
1818        /*
1819         * The lock serves a purpose in addition to locking: the new
1820         * contents of .git/config will be written into it.
1821         */
1822        lock = xcalloc(1, sizeof(struct lock_file));
1823        fd = hold_lock_file_for_update(lock, config_filename, 0);
1824        if (fd < 0) {
1825                error("could not lock config file %s: %s", config_filename, strerror(errno));
1826                free(store.key);
1827                ret = CONFIG_NO_LOCK;
1828                goto out_free;
1829        }
1830
1831        /*
1832         * If .git/config does not exist yet, write a minimal version.
1833         */
1834        in_fd = open(config_filename, O_RDONLY);
1835        if ( in_fd < 0 ) {
1836                free(store.key);
1837
1838                if ( ENOENT != errno ) {
1839                        error("opening %s: %s", config_filename,
1840                              strerror(errno));
1841                        ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1842                        goto out_free;
1843                }
1844                /* if nothing to unset, error out */
1845                if (value == NULL) {
1846                        ret = CONFIG_NOTHING_SET;
1847                        goto out_free;
1848                }
1849
1850                store.key = (char *)key;
1851                if (!store_write_section(fd, key) ||
1852                    !store_write_pair(fd, key, value))
1853                        goto write_err_out;
1854        } else {
1855                struct stat st;
1856                char *contents;
1857                size_t contents_sz, copy_begin, copy_end;
1858                int i, new_line = 0;
1859
1860                if (value_regex == NULL)
1861                        store.value_regex = NULL;
1862                else {
1863                        if (value_regex[0] == '!') {
1864                                store.do_not_match = 1;
1865                                value_regex++;
1866                        } else
1867                                store.do_not_match = 0;
1868
1869                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1870                        if (regcomp(store.value_regex, value_regex,
1871                                        REG_EXTENDED)) {
1872                                error("invalid pattern: %s", value_regex);
1873                                free(store.value_regex);
1874                                ret = CONFIG_INVALID_PATTERN;
1875                                goto out_free;
1876                        }
1877                }
1878
1879                ALLOC_GROW(store.offset, 1, store.offset_alloc);
1880                store.offset[0] = 0;
1881                store.state = START;
1882                store.seen = 0;
1883
1884                /*
1885                 * After this, store.offset will contain the *end* offset
1886                 * of the last match, or remain at 0 if no match was found.
1887                 * As a side effect, we make sure to transform only a valid
1888                 * existing config file.
1889                 */
1890                if (git_config_from_file(store_aux, config_filename, NULL)) {
1891                        error("invalid config file %s", config_filename);
1892                        free(store.key);
1893                        if (store.value_regex != NULL) {
1894                                regfree(store.value_regex);
1895                                free(store.value_regex);
1896                        }
1897                        ret = CONFIG_INVALID_FILE;
1898                        goto out_free;
1899                }
1900
1901                free(store.key);
1902                if (store.value_regex != NULL) {
1903                        regfree(store.value_regex);
1904                        free(store.value_regex);
1905                }
1906
1907                /* if nothing to unset, or too many matches, error out */
1908                if ((store.seen == 0 && value == NULL) ||
1909                                (store.seen > 1 && multi_replace == 0)) {
1910                        ret = CONFIG_NOTHING_SET;
1911                        goto out_free;
1912                }
1913
1914                fstat(in_fd, &st);
1915                contents_sz = xsize_t(st.st_size);
1916                contents = xmmap(NULL, contents_sz, PROT_READ,
1917                        MAP_PRIVATE, in_fd, 0);
1918                close(in_fd);
1919
1920                if (chmod(lock->filename, st.st_mode & 07777) < 0) {
1921                        error("chmod on %s failed: %s",
1922                                lock->filename, strerror(errno));
1923                        ret = CONFIG_NO_WRITE;
1924                        goto out_free;
1925                }
1926
1927                if (store.seen == 0)
1928                        store.seen = 1;
1929
1930                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1931                        if (store.offset[i] == 0) {
1932                                store.offset[i] = copy_end = contents_sz;
1933                        } else if (store.state != KEY_SEEN) {
1934                                copy_end = store.offset[i];
1935                        } else
1936                                copy_end = find_beginning_of_line(
1937                                        contents, contents_sz,
1938                                        store.offset[i]-2, &new_line);
1939
1940                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1941                                new_line = 1;
1942
1943                        /* write the first part of the config */
1944                        if (copy_end > copy_begin) {
1945                                if (write_in_full(fd, contents + copy_begin,
1946                                                  copy_end - copy_begin) <
1947                                    copy_end - copy_begin)
1948                                        goto write_err_out;
1949                                if (new_line &&
1950                                    write_str_in_full(fd, "\n") != 1)
1951                                        goto write_err_out;
1952                        }
1953                        copy_begin = store.offset[i];
1954                }
1955
1956                /* write the pair (value == NULL means unset) */
1957                if (value != NULL) {
1958                        if (store.state == START) {
1959                                if (!store_write_section(fd, key))
1960                                        goto write_err_out;
1961                        }
1962                        if (!store_write_pair(fd, key, value))
1963                                goto write_err_out;
1964                }
1965
1966                /* write the rest of the config */
1967                if (copy_begin < contents_sz)
1968                        if (write_in_full(fd, contents + copy_begin,
1969                                          contents_sz - copy_begin) <
1970                            contents_sz - copy_begin)
1971                                goto write_err_out;
1972
1973                munmap(contents, contents_sz);
1974        }
1975
1976        if (commit_lock_file(lock) < 0) {
1977                error("could not commit config file %s", config_filename);
1978                ret = CONFIG_NO_WRITE;
1979                goto out_free;
1980        }
1981
1982        /*
1983         * lock is committed, so don't try to roll it back below.
1984         * NOTE: Since lockfile.c keeps a linked list of all created
1985         * lock_file structures, it isn't safe to free(lock).  It's
1986         * better to just leave it hanging around.
1987         */
1988        lock = NULL;
1989        ret = 0;
1990
1991        /* Invalidate the config cache */
1992        git_config_clear();
1993
1994out_free:
1995        if (lock)
1996                rollback_lock_file(lock);
1997        free(filename_buf);
1998        return ret;
1999
2000write_err_out:
2001        ret = write_error(lock->filename);
2002        goto out_free;
2003
2004}
2005
2006int git_config_set_multivar(const char *key, const char *value,
2007                        const char *value_regex, int multi_replace)
2008{
2009        return git_config_set_multivar_in_file(NULL, key, value, value_regex,
2010                                               multi_replace);
2011}
2012
2013static int section_name_match (const char *buf, const char *name)
2014{
2015        int i = 0, j = 0, dot = 0;
2016        if (buf[i] != '[')
2017                return 0;
2018        for (i = 1; buf[i] && buf[i] != ']'; i++) {
2019                if (!dot && isspace(buf[i])) {
2020                        dot = 1;
2021                        if (name[j++] != '.')
2022                                break;
2023                        for (i++; isspace(buf[i]); i++)
2024                                ; /* do nothing */
2025                        if (buf[i] != '"')
2026                                break;
2027                        continue;
2028                }
2029                if (buf[i] == '\\' && dot)
2030                        i++;
2031                else if (buf[i] == '"' && dot) {
2032                        for (i++; isspace(buf[i]); i++)
2033                                ; /* do_nothing */
2034                        break;
2035                }
2036                if (buf[i] != name[j++])
2037                        break;
2038        }
2039        if (buf[i] == ']' && name[j] == 0) {
2040                /*
2041                 * We match, now just find the right length offset by
2042                 * gobbling up any whitespace after it, as well
2043                 */
2044                i++;
2045                for (; buf[i] && isspace(buf[i]); i++)
2046                        ; /* do nothing */
2047                return i;
2048        }
2049        return 0;
2050}
2051
2052static int section_name_is_ok(const char *name)
2053{
2054        /* Empty section names are bogus. */
2055        if (!*name)
2056                return 0;
2057
2058        /*
2059         * Before a dot, we must be alphanumeric or dash. After the first dot,
2060         * anything goes, so we can stop checking.
2061         */
2062        for (; *name && *name != '.'; name++)
2063                if (*name != '-' && !isalnum(*name))
2064                        return 0;
2065        return 1;
2066}
2067
2068/* if new_name == NULL, the section is removed instead */
2069int git_config_rename_section_in_file(const char *config_filename,
2070                                      const char *old_name, const char *new_name)
2071{
2072        int ret = 0, remove = 0;
2073        char *filename_buf = NULL;
2074        struct lock_file *lock;
2075        int out_fd;
2076        char buf[1024];
2077        FILE *config_file;
2078        struct stat st;
2079
2080        if (new_name && !section_name_is_ok(new_name)) {
2081                ret = error("invalid section name: %s", new_name);
2082                goto out;
2083        }
2084
2085        if (!config_filename)
2086                config_filename = filename_buf = git_pathdup("config");
2087
2088        lock = xcalloc(1, sizeof(struct lock_file));
2089        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
2090        if (out_fd < 0) {
2091                ret = error("could not lock config file %s", config_filename);
2092                goto out;
2093        }
2094
2095        if (!(config_file = fopen(config_filename, "rb"))) {
2096                /* no config file means nothing to rename, no error */
2097                goto unlock_and_out;
2098        }
2099
2100        fstat(fileno(config_file), &st);
2101
2102        if (chmod(lock->filename, st.st_mode & 07777) < 0) {
2103                ret = error("chmod on %s failed: %s",
2104                                lock->filename, strerror(errno));
2105                goto out;
2106        }
2107
2108        while (fgets(buf, sizeof(buf), config_file)) {
2109                int i;
2110                int length;
2111                char *output = buf;
2112                for (i = 0; buf[i] && isspace(buf[i]); i++)
2113                        ; /* do nothing */
2114                if (buf[i] == '[') {
2115                        /* it's a section */
2116                        int offset = section_name_match(&buf[i], old_name);
2117                        if (offset > 0) {
2118                                ret++;
2119                                if (new_name == NULL) {
2120                                        remove = 1;
2121                                        continue;
2122                                }
2123                                store.baselen = strlen(new_name);
2124                                if (!store_write_section(out_fd, new_name)) {
2125                                        ret = write_error(lock->filename);
2126                                        goto out;
2127                                }
2128                                /*
2129                                 * We wrote out the new section, with
2130                                 * a newline, now skip the old
2131                                 * section's length
2132                                 */
2133                                output += offset + i;
2134                                if (strlen(output) > 0) {
2135                                        /*
2136                                         * More content means there's
2137                                         * a declaration to put on the
2138                                         * next line; indent with a
2139                                         * tab
2140                                         */
2141                                        output -= 1;
2142                                        output[0] = '\t';
2143                                }
2144                        }
2145                        remove = 0;
2146                }
2147                if (remove)
2148                        continue;
2149                length = strlen(output);
2150                if (write_in_full(out_fd, output, length) != length) {
2151                        ret = write_error(lock->filename);
2152                        goto out;
2153                }
2154        }
2155        fclose(config_file);
2156unlock_and_out:
2157        if (commit_lock_file(lock) < 0)
2158                ret = error("could not commit config file %s", config_filename);
2159out:
2160        free(filename_buf);
2161        return ret;
2162}
2163
2164int git_config_rename_section(const char *old_name, const char *new_name)
2165{
2166        return git_config_rename_section_in_file(NULL, old_name, new_name);
2167}
2168
2169/*
2170 * Call this to report error for your variable that should not
2171 * get a boolean value (i.e. "[my] var" means "true").
2172 */
2173#undef config_error_nonbool
2174int config_error_nonbool(const char *var)
2175{
2176        return error("Missing value for '%s'", var);
2177}
2178
2179int parse_config_key(const char *var,
2180                     const char *section,
2181                     const char **subsection, int *subsection_len,
2182                     const char **key)
2183{
2184        int section_len = strlen(section);
2185        const char *dot;
2186
2187        /* Does it start with "section." ? */
2188        if (!starts_with(var, section) || var[section_len] != '.')
2189                return -1;
2190
2191        /*
2192         * Find the key; we don't know yet if we have a subsection, but we must
2193         * parse backwards from the end, since the subsection may have dots in
2194         * it, too.
2195         */
2196        dot = strrchr(var, '.');
2197        *key = dot + 1;
2198
2199        /* Did we have a subsection at all? */
2200        if (dot == var + section_len) {
2201                *subsection = NULL;
2202                *subsection_len = 0;
2203        }
2204        else {
2205                *subsection = var + section_len + 1;
2206                *subsection_len = dot - *subsection;
2207        }
2208
2209        return 0;
2210}