config.con commit Merge branch 'jc/push-cert' (fb06b52)
   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
  38static struct config_source *cf;
  39
  40static int zlib_compression_seen;
  41
  42/*
  43 * Default config_set that contains key-value pairs from the usual set of config
  44 * config files (i.e repo specific .git/config, user wide ~/.gitconfig, XDG
  45 * config file and the global /etc/gitconfig)
  46 */
  47static struct config_set the_config_set;
  48
  49static int config_file_fgetc(struct config_source *conf)
  50{
  51        return fgetc(conf->u.file);
  52}
  53
  54static int config_file_ungetc(int c, struct config_source *conf)
  55{
  56        return ungetc(c, conf->u.file);
  57}
  58
  59static long config_file_ftell(struct config_source *conf)
  60{
  61        return ftell(conf->u.file);
  62}
  63
  64
  65static int config_buf_fgetc(struct config_source *conf)
  66{
  67        if (conf->u.buf.pos < conf->u.buf.len)
  68                return conf->u.buf.buf[conf->u.buf.pos++];
  69
  70        return EOF;
  71}
  72
  73static int config_buf_ungetc(int c, struct config_source *conf)
  74{
  75        if (conf->u.buf.pos > 0)
  76                return conf->u.buf.buf[--conf->u.buf.pos];
  77
  78        return EOF;
  79}
  80
  81static long config_buf_ftell(struct config_source *conf)
  82{
  83        return conf->u.buf.pos;
  84}
  85
  86#define MAX_INCLUDE_DEPTH 10
  87static const char include_depth_advice[] =
  88"exceeded maximum include depth (%d) while including\n"
  89"       %s\n"
  90"from\n"
  91"       %s\n"
  92"Do you have circular includes?";
  93static int handle_path_include(const char *path, struct config_include_data *inc)
  94{
  95        int ret = 0;
  96        struct strbuf buf = STRBUF_INIT;
  97        char *expanded;
  98
  99        if (!path)
 100                return config_error_nonbool("include.path");
 101
 102        expanded = expand_user_path(path);
 103        if (!expanded)
 104                return error("Could not expand include path '%s'", path);
 105        path = expanded;
 106
 107        /*
 108         * Use an absolute path as-is, but interpret relative paths
 109         * based on the including config file.
 110         */
 111        if (!is_absolute_path(path)) {
 112                char *slash;
 113
 114                if (!cf || !cf->path)
 115                        return error("relative config includes must come from files");
 116
 117                slash = find_last_dir_sep(cf->path);
 118                if (slash)
 119                        strbuf_add(&buf, cf->path, slash - cf->path + 1);
 120                strbuf_addstr(&buf, path);
 121                path = buf.buf;
 122        }
 123
 124        if (!access_or_die(path, R_OK, 0)) {
 125                if (++inc->depth > MAX_INCLUDE_DEPTH)
 126                        die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
 127                            cf && cf->name ? cf->name : "the command line");
 128                ret = git_config_from_file(git_config_include, path, inc);
 129                inc->depth--;
 130        }
 131        strbuf_release(&buf);
 132        free(expanded);
 133        return ret;
 134}
 135
 136int git_config_include(const char *var, const char *value, void *data)
 137{
 138        struct config_include_data *inc = data;
 139        int ret;
 140
 141        /*
 142         * Pass along all values, including "include" directives; this makes it
 143         * possible to query information on the includes themselves.
 144         */
 145        ret = inc->fn(var, value, inc->data);
 146        if (ret < 0)
 147                return ret;
 148
 149        if (!strcmp(var, "include.path"))
 150                ret = handle_path_include(value, inc);
 151        return ret;
 152}
 153
 154void git_config_push_parameter(const char *text)
 155{
 156        struct strbuf env = STRBUF_INIT;
 157        const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
 158        if (old) {
 159                strbuf_addstr(&env, old);
 160                strbuf_addch(&env, ' ');
 161        }
 162        sq_quote_buf(&env, text);
 163        setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
 164        strbuf_release(&env);
 165}
 166
 167int git_config_parse_parameter(const char *text,
 168                               config_fn_t fn, void *data)
 169{
 170        const char *value;
 171        struct strbuf **pair;
 172
 173        pair = strbuf_split_str(text, '=', 2);
 174        if (!pair[0])
 175                return error("bogus config parameter: %s", text);
 176
 177        if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=') {
 178                strbuf_setlen(pair[0], pair[0]->len - 1);
 179                value = pair[1] ? pair[1]->buf : "";
 180        } else {
 181                value = NULL;
 182        }
 183
 184        strbuf_trim(pair[0]);
 185        if (!pair[0]->len) {
 186                strbuf_list_free(pair);
 187                return error("bogus config parameter: %s", text);
 188        }
 189        strbuf_tolower(pair[0]);
 190        if (fn(pair[0]->buf, value, data) < 0) {
 191                strbuf_list_free(pair);
 192                return -1;
 193        }
 194        strbuf_list_free(pair);
 195        return 0;
 196}
 197
 198int git_config_from_parameters(config_fn_t fn, void *data)
 199{
 200        const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 201        char *envw;
 202        const char **argv = NULL;
 203        int nr = 0, alloc = 0;
 204        int i;
 205
 206        if (!env)
 207                return 0;
 208        /* sq_dequote will write over it */
 209        envw = xstrdup(env);
 210
 211        if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 212                free(envw);
 213                return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
 214        }
 215
 216        for (i = 0; i < nr; i++) {
 217                if (git_config_parse_parameter(argv[i], fn, data) < 0) {
 218                        free(argv);
 219                        free(envw);
 220                        return -1;
 221                }
 222        }
 223
 224        free(argv);
 225        free(envw);
 226        return nr > 0;
 227}
 228
 229static int get_next_char(void)
 230{
 231        int c = cf->do_fgetc(cf);
 232
 233        if (c == '\r') {
 234                /* DOS like systems */
 235                c = cf->do_fgetc(cf);
 236                if (c != '\n') {
 237                        cf->do_ungetc(c, cf);
 238                        c = '\r';
 239                }
 240        }
 241        if (c == '\n')
 242                cf->linenr++;
 243        if (c == EOF) {
 244                cf->eof = 1;
 245                cf->linenr++;
 246                c = '\n';
 247        }
 248        return c;
 249}
 250
 251static char *parse_value(void)
 252{
 253        int quote = 0, comment = 0, space = 0;
 254
 255        strbuf_reset(&cf->value);
 256        for (;;) {
 257                int c = get_next_char();
 258                if (c == '\n') {
 259                        if (quote) {
 260                                cf->linenr--;
 261                                return NULL;
 262                        }
 263                        return cf->value.buf;
 264                }
 265                if (comment)
 266                        continue;
 267                if (isspace(c) && !quote) {
 268                        if (cf->value.len)
 269                                space++;
 270                        continue;
 271                }
 272                if (!quote) {
 273                        if (c == ';' || c == '#') {
 274                                comment = 1;
 275                                continue;
 276                        }
 277                }
 278                for (; space; space--)
 279                        strbuf_addch(&cf->value, ' ');
 280                if (c == '\\') {
 281                        c = get_next_char();
 282                        switch (c) {
 283                        case '\n':
 284                                continue;
 285                        case 't':
 286                                c = '\t';
 287                                break;
 288                        case 'b':
 289                                c = '\b';
 290                                break;
 291                        case 'n':
 292                                c = '\n';
 293                                break;
 294                        /* Some characters escape as themselves */
 295                        case '\\': case '"':
 296                                break;
 297                        /* Reject unknown escape sequences */
 298                        default:
 299                                return NULL;
 300                        }
 301                        strbuf_addch(&cf->value, c);
 302                        continue;
 303                }
 304                if (c == '"') {
 305                        quote = 1-quote;
 306                        continue;
 307                }
 308                strbuf_addch(&cf->value, c);
 309        }
 310}
 311
 312static inline int iskeychar(int c)
 313{
 314        return isalnum(c) || c == '-';
 315}
 316
 317static int get_value(config_fn_t fn, void *data, struct strbuf *name)
 318{
 319        int c;
 320        char *value;
 321        int ret;
 322
 323        /* Get the full name */
 324        for (;;) {
 325                c = get_next_char();
 326                if (cf->eof)
 327                        break;
 328                if (!iskeychar(c))
 329                        break;
 330                strbuf_addch(name, tolower(c));
 331        }
 332
 333        while (c == ' ' || c == '\t')
 334                c = get_next_char();
 335
 336        value = NULL;
 337        if (c != '\n') {
 338                if (c != '=')
 339                        return -1;
 340                value = parse_value();
 341                if (!value)
 342                        return -1;
 343        }
 344        /*
 345         * We already consumed the \n, but we need linenr to point to
 346         * the line we just parsed during the call to fn to get
 347         * accurate line number in error messages.
 348         */
 349        cf->linenr--;
 350        ret = fn(name->buf, value, data);
 351        cf->linenr++;
 352        return ret;
 353}
 354
 355static int get_extended_base_var(struct strbuf *name, int c)
 356{
 357        do {
 358                if (c == '\n')
 359                        goto error_incomplete_line;
 360                c = get_next_char();
 361        } while (isspace(c));
 362
 363        /* We require the format to be '[base "extension"]' */
 364        if (c != '"')
 365                return -1;
 366        strbuf_addch(name, '.');
 367
 368        for (;;) {
 369                int c = get_next_char();
 370                if (c == '\n')
 371                        goto error_incomplete_line;
 372                if (c == '"')
 373                        break;
 374                if (c == '\\') {
 375                        c = get_next_char();
 376                        if (c == '\n')
 377                                goto error_incomplete_line;
 378                }
 379                strbuf_addch(name, c);
 380        }
 381
 382        /* Final ']' */
 383        if (get_next_char() != ']')
 384                return -1;
 385        return 0;
 386error_incomplete_line:
 387        cf->linenr--;
 388        return -1;
 389}
 390
 391static int get_base_var(struct strbuf *name)
 392{
 393        for (;;) {
 394                int c = get_next_char();
 395                if (cf->eof)
 396                        return -1;
 397                if (c == ']')
 398                        return 0;
 399                if (isspace(c))
 400                        return get_extended_base_var(name, c);
 401                if (!iskeychar(c) && c != '.')
 402                        return -1;
 403                strbuf_addch(name, tolower(c));
 404        }
 405}
 406
 407static int git_parse_source(config_fn_t fn, void *data)
 408{
 409        int comment = 0;
 410        int baselen = 0;
 411        struct strbuf *var = &cf->var;
 412
 413        /* U+FEFF Byte Order Mark in UTF8 */
 414        static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 415        const unsigned char *bomptr = utf8_bom;
 416
 417        for (;;) {
 418                int c = get_next_char();
 419                if (bomptr && *bomptr) {
 420                        /* We are at the file beginning; skip UTF8-encoded BOM
 421                         * if present. Sane editors won't put this in on their
 422                         * own, but e.g. Windows Notepad will do it happily. */
 423                        if ((unsigned char) c == *bomptr) {
 424                                bomptr++;
 425                                continue;
 426                        } else {
 427                                /* Do not tolerate partial BOM. */
 428                                if (bomptr != utf8_bom)
 429                                        break;
 430                                /* No BOM at file beginning. Cool. */
 431                                bomptr = NULL;
 432                        }
 433                }
 434                if (c == '\n') {
 435                        if (cf->eof)
 436                                return 0;
 437                        comment = 0;
 438                        continue;
 439                }
 440                if (comment || isspace(c))
 441                        continue;
 442                if (c == '#' || c == ';') {
 443                        comment = 1;
 444                        continue;
 445                }
 446                if (c == '[') {
 447                        /* Reset prior to determining a new stem */
 448                        strbuf_reset(var);
 449                        if (get_base_var(var) < 0 || var->len < 1)
 450                                break;
 451                        strbuf_addch(var, '.');
 452                        baselen = var->len;
 453                        continue;
 454                }
 455                if (!isalpha(c))
 456                        break;
 457                /*
 458                 * Truncate the var name back to the section header
 459                 * stem prior to grabbing the suffix part of the name
 460                 * and the value.
 461                 */
 462                strbuf_setlen(var, baselen);
 463                strbuf_addch(var, tolower(c));
 464                if (get_value(fn, data, var) < 0)
 465                        break;
 466        }
 467        if (cf->die_on_error)
 468                die(_("bad config file line %d in %s"), cf->linenr, cf->name);
 469        else
 470                return error(_("bad config file line %d in %s"), cf->linenr, cf->name);
 471}
 472
 473static int parse_unit_factor(const char *end, uintmax_t *val)
 474{
 475        if (!*end)
 476                return 1;
 477        else if (!strcasecmp(end, "k")) {
 478                *val *= 1024;
 479                return 1;
 480        }
 481        else if (!strcasecmp(end, "m")) {
 482                *val *= 1024 * 1024;
 483                return 1;
 484        }
 485        else if (!strcasecmp(end, "g")) {
 486                *val *= 1024 * 1024 * 1024;
 487                return 1;
 488        }
 489        return 0;
 490}
 491
 492static int git_parse_signed(const char *value, intmax_t *ret, intmax_t max)
 493{
 494        if (value && *value) {
 495                char *end;
 496                intmax_t val;
 497                uintmax_t uval;
 498                uintmax_t factor = 1;
 499
 500                errno = 0;
 501                val = strtoimax(value, &end, 0);
 502                if (errno == ERANGE)
 503                        return 0;
 504                if (!parse_unit_factor(end, &factor)) {
 505                        errno = EINVAL;
 506                        return 0;
 507                }
 508                uval = abs(val);
 509                uval *= factor;
 510                if (uval > max || abs(val) > uval) {
 511                        errno = ERANGE;
 512                        return 0;
 513                }
 514                val *= factor;
 515                *ret = val;
 516                return 1;
 517        }
 518        errno = EINVAL;
 519        return 0;
 520}
 521
 522static int git_parse_unsigned(const char *value, uintmax_t *ret, uintmax_t max)
 523{
 524        if (value && *value) {
 525                char *end;
 526                uintmax_t val;
 527                uintmax_t oldval;
 528
 529                errno = 0;
 530                val = strtoumax(value, &end, 0);
 531                if (errno == ERANGE)
 532                        return 0;
 533                oldval = val;
 534                if (!parse_unit_factor(end, &val)) {
 535                        errno = EINVAL;
 536                        return 0;
 537                }
 538                if (val > max || oldval > val) {
 539                        errno = ERANGE;
 540                        return 0;
 541                }
 542                *ret = val;
 543                return 1;
 544        }
 545        errno = EINVAL;
 546        return 0;
 547}
 548
 549static int git_parse_int(const char *value, int *ret)
 550{
 551        intmax_t tmp;
 552        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int)))
 553                return 0;
 554        *ret = tmp;
 555        return 1;
 556}
 557
 558static int git_parse_int64(const char *value, int64_t *ret)
 559{
 560        intmax_t tmp;
 561        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int64_t)))
 562                return 0;
 563        *ret = tmp;
 564        return 1;
 565}
 566
 567int git_parse_ulong(const char *value, unsigned long *ret)
 568{
 569        uintmax_t tmp;
 570        if (!git_parse_unsigned(value, &tmp, maximum_unsigned_value_of_type(long)))
 571                return 0;
 572        *ret = tmp;
 573        return 1;
 574}
 575
 576NORETURN
 577static void die_bad_number(const char *name, const char *value)
 578{
 579        const char *reason = errno == ERANGE ?
 580                             "out of range" :
 581                             "invalid unit";
 582        if (!value)
 583                value = "";
 584
 585        if (cf && cf->name)
 586                die(_("bad numeric config value '%s' for '%s' in %s: %s"),
 587                    value, name, cf->name, reason);
 588        die(_("bad numeric config value '%s' for '%s': %s"), value, name, reason);
 589}
 590
 591int git_config_int(const char *name, const char *value)
 592{
 593        int ret;
 594        if (!git_parse_int(value, &ret))
 595                die_bad_number(name, value);
 596        return ret;
 597}
 598
 599int64_t git_config_int64(const char *name, const char *value)
 600{
 601        int64_t ret;
 602        if (!git_parse_int64(value, &ret))
 603                die_bad_number(name, value);
 604        return ret;
 605}
 606
 607unsigned long git_config_ulong(const char *name, const char *value)
 608{
 609        unsigned long ret;
 610        if (!git_parse_ulong(value, &ret))
 611                die_bad_number(name, value);
 612        return ret;
 613}
 614
 615static int git_config_maybe_bool_text(const char *name, const char *value)
 616{
 617        if (!value)
 618                return 1;
 619        if (!*value)
 620                return 0;
 621        if (!strcasecmp(value, "true")
 622            || !strcasecmp(value, "yes")
 623            || !strcasecmp(value, "on"))
 624                return 1;
 625        if (!strcasecmp(value, "false")
 626            || !strcasecmp(value, "no")
 627            || !strcasecmp(value, "off"))
 628                return 0;
 629        return -1;
 630}
 631
 632int git_config_maybe_bool(const char *name, const char *value)
 633{
 634        int v = git_config_maybe_bool_text(name, value);
 635        if (0 <= v)
 636                return v;
 637        if (git_parse_int(value, &v))
 638                return !!v;
 639        return -1;
 640}
 641
 642int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 643{
 644        int v = git_config_maybe_bool_text(name, value);
 645        if (0 <= v) {
 646                *is_bool = 1;
 647                return v;
 648        }
 649        *is_bool = 0;
 650        return git_config_int(name, value);
 651}
 652
 653int git_config_bool(const char *name, const char *value)
 654{
 655        int discard;
 656        return !!git_config_bool_or_int(name, value, &discard);
 657}
 658
 659int git_config_string(const char **dest, const char *var, const char *value)
 660{
 661        if (!value)
 662                return config_error_nonbool(var);
 663        *dest = xstrdup(value);
 664        return 0;
 665}
 666
 667int git_config_pathname(const char **dest, const char *var, const char *value)
 668{
 669        if (!value)
 670                return config_error_nonbool(var);
 671        *dest = expand_user_path(value);
 672        if (!*dest)
 673                die(_("failed to expand user dir in: '%s'"), value);
 674        return 0;
 675}
 676
 677static int git_default_core_config(const char *var, const char *value)
 678{
 679        /* This needs a better name */
 680        if (!strcmp(var, "core.filemode")) {
 681                trust_executable_bit = git_config_bool(var, value);
 682                return 0;
 683        }
 684        if (!strcmp(var, "core.trustctime")) {
 685                trust_ctime = git_config_bool(var, value);
 686                return 0;
 687        }
 688        if (!strcmp(var, "core.checkstat")) {
 689                if (!strcasecmp(value, "default"))
 690                        check_stat = 1;
 691                else if (!strcasecmp(value, "minimal"))
 692                        check_stat = 0;
 693        }
 694
 695        if (!strcmp(var, "core.quotepath")) {
 696                quote_path_fully = git_config_bool(var, value);
 697                return 0;
 698        }
 699
 700        if (!strcmp(var, "core.symlinks")) {
 701                has_symlinks = git_config_bool(var, value);
 702                return 0;
 703        }
 704
 705        if (!strcmp(var, "core.ignorecase")) {
 706                ignore_case = git_config_bool(var, value);
 707                return 0;
 708        }
 709
 710        if (!strcmp(var, "core.attributesfile"))
 711                return git_config_pathname(&git_attributes_file, var, value);
 712
 713        if (!strcmp(var, "core.bare")) {
 714                is_bare_repository_cfg = git_config_bool(var, value);
 715                return 0;
 716        }
 717
 718        if (!strcmp(var, "core.ignorestat")) {
 719                assume_unchanged = git_config_bool(var, value);
 720                return 0;
 721        }
 722
 723        if (!strcmp(var, "core.prefersymlinkrefs")) {
 724                prefer_symlink_refs = git_config_bool(var, value);
 725                return 0;
 726        }
 727
 728        if (!strcmp(var, "core.logallrefupdates")) {
 729                log_all_ref_updates = git_config_bool(var, value);
 730                return 0;
 731        }
 732
 733        if (!strcmp(var, "core.warnambiguousrefs")) {
 734                warn_ambiguous_refs = git_config_bool(var, value);
 735                return 0;
 736        }
 737
 738        if (!strcmp(var, "core.abbrev")) {
 739                int abbrev = git_config_int(var, value);
 740                if (abbrev < minimum_abbrev || abbrev > 40)
 741                        return -1;
 742                default_abbrev = abbrev;
 743                return 0;
 744        }
 745
 746        if (!strcmp(var, "core.loosecompression")) {
 747                int level = git_config_int(var, value);
 748                if (level == -1)
 749                        level = Z_DEFAULT_COMPRESSION;
 750                else if (level < 0 || level > Z_BEST_COMPRESSION)
 751                        die(_("bad zlib compression level %d"), level);
 752                zlib_compression_level = level;
 753                zlib_compression_seen = 1;
 754                return 0;
 755        }
 756
 757        if (!strcmp(var, "core.compression")) {
 758                int level = git_config_int(var, value);
 759                if (level == -1)
 760                        level = Z_DEFAULT_COMPRESSION;
 761                else if (level < 0 || level > Z_BEST_COMPRESSION)
 762                        die(_("bad zlib compression level %d"), level);
 763                core_compression_level = level;
 764                core_compression_seen = 1;
 765                if (!zlib_compression_seen)
 766                        zlib_compression_level = level;
 767                return 0;
 768        }
 769
 770        if (!strcmp(var, "core.packedgitwindowsize")) {
 771                int pgsz_x2 = getpagesize() * 2;
 772                packed_git_window_size = git_config_ulong(var, value);
 773
 774                /* This value must be multiple of (pagesize * 2) */
 775                packed_git_window_size /= pgsz_x2;
 776                if (packed_git_window_size < 1)
 777                        packed_git_window_size = 1;
 778                packed_git_window_size *= pgsz_x2;
 779                return 0;
 780        }
 781
 782        if (!strcmp(var, "core.bigfilethreshold")) {
 783                big_file_threshold = git_config_ulong(var, value);
 784                return 0;
 785        }
 786
 787        if (!strcmp(var, "core.packedgitlimit")) {
 788                packed_git_limit = git_config_ulong(var, value);
 789                return 0;
 790        }
 791
 792        if (!strcmp(var, "core.deltabasecachelimit")) {
 793                delta_base_cache_limit = git_config_ulong(var, value);
 794                return 0;
 795        }
 796
 797        if (!strcmp(var, "core.autocrlf")) {
 798                if (value && !strcasecmp(value, "input")) {
 799                        if (core_eol == EOL_CRLF)
 800                                return error("core.autocrlf=input conflicts with core.eol=crlf");
 801                        auto_crlf = AUTO_CRLF_INPUT;
 802                        return 0;
 803                }
 804                auto_crlf = git_config_bool(var, value);
 805                return 0;
 806        }
 807
 808        if (!strcmp(var, "core.safecrlf")) {
 809                if (value && !strcasecmp(value, "warn")) {
 810                        safe_crlf = SAFE_CRLF_WARN;
 811                        return 0;
 812                }
 813                safe_crlf = git_config_bool(var, value);
 814                return 0;
 815        }
 816
 817        if (!strcmp(var, "core.eol")) {
 818                if (value && !strcasecmp(value, "lf"))
 819                        core_eol = EOL_LF;
 820                else if (value && !strcasecmp(value, "crlf"))
 821                        core_eol = EOL_CRLF;
 822                else if (value && !strcasecmp(value, "native"))
 823                        core_eol = EOL_NATIVE;
 824                else
 825                        core_eol = EOL_UNSET;
 826                if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 827                        return error("core.autocrlf=input conflicts with core.eol=crlf");
 828                return 0;
 829        }
 830
 831        if (!strcmp(var, "core.notesref")) {
 832                notes_ref_name = xstrdup(value);
 833                return 0;
 834        }
 835
 836        if (!strcmp(var, "core.pager"))
 837                return git_config_string(&pager_program, var, value);
 838
 839        if (!strcmp(var, "core.editor"))
 840                return git_config_string(&editor_program, var, value);
 841
 842        if (!strcmp(var, "core.commentchar")) {
 843                if (!value)
 844                        return config_error_nonbool(var);
 845                else if (!strcasecmp(value, "auto"))
 846                        auto_comment_line_char = 1;
 847                else if (value[0] && !value[1]) {
 848                        comment_line_char = value[0];
 849                        auto_comment_line_char = 0;
 850                } else
 851                        return error("core.commentChar should only be one character");
 852                return 0;
 853        }
 854
 855        if (!strcmp(var, "core.askpass"))
 856                return git_config_string(&askpass_program, var, value);
 857
 858        if (!strcmp(var, "core.excludesfile"))
 859                return git_config_pathname(&excludes_file, var, value);
 860
 861        if (!strcmp(var, "core.whitespace")) {
 862                if (!value)
 863                        return config_error_nonbool(var);
 864                whitespace_rule_cfg = parse_whitespace_rule(value);
 865                return 0;
 866        }
 867
 868        if (!strcmp(var, "core.fsyncobjectfiles")) {
 869                fsync_object_files = git_config_bool(var, value);
 870                return 0;
 871        }
 872
 873        if (!strcmp(var, "core.preloadindex")) {
 874                core_preload_index = git_config_bool(var, value);
 875                return 0;
 876        }
 877
 878        if (!strcmp(var, "core.createobject")) {
 879                if (!strcmp(value, "rename"))
 880                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 881                else if (!strcmp(value, "link"))
 882                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 883                else
 884                        die(_("invalid mode for object creation: %s"), value);
 885                return 0;
 886        }
 887
 888        if (!strcmp(var, "core.sparsecheckout")) {
 889                core_apply_sparse_checkout = git_config_bool(var, value);
 890                return 0;
 891        }
 892
 893        if (!strcmp(var, "core.precomposeunicode")) {
 894                precomposed_unicode = git_config_bool(var, value);
 895                return 0;
 896        }
 897
 898        /* Add other config variables here and to Documentation/config.txt. */
 899        return 0;
 900}
 901
 902static int git_default_i18n_config(const char *var, const char *value)
 903{
 904        if (!strcmp(var, "i18n.commitencoding"))
 905                return git_config_string(&git_commit_encoding, var, value);
 906
 907        if (!strcmp(var, "i18n.logoutputencoding"))
 908                return git_config_string(&git_log_output_encoding, var, value);
 909
 910        /* Add other config variables here and to Documentation/config.txt. */
 911        return 0;
 912}
 913
 914static int git_default_branch_config(const char *var, const char *value)
 915{
 916        if (!strcmp(var, "branch.autosetupmerge")) {
 917                if (value && !strcasecmp(value, "always")) {
 918                        git_branch_track = BRANCH_TRACK_ALWAYS;
 919                        return 0;
 920                }
 921                git_branch_track = git_config_bool(var, value);
 922                return 0;
 923        }
 924        if (!strcmp(var, "branch.autosetuprebase")) {
 925                if (!value)
 926                        return config_error_nonbool(var);
 927                else if (!strcmp(value, "never"))
 928                        autorebase = AUTOREBASE_NEVER;
 929                else if (!strcmp(value, "local"))
 930                        autorebase = AUTOREBASE_LOCAL;
 931                else if (!strcmp(value, "remote"))
 932                        autorebase = AUTOREBASE_REMOTE;
 933                else if (!strcmp(value, "always"))
 934                        autorebase = AUTOREBASE_ALWAYS;
 935                else
 936                        return error("Malformed value for %s", var);
 937                return 0;
 938        }
 939
 940        /* Add other config variables here and to Documentation/config.txt. */
 941        return 0;
 942}
 943
 944static int git_default_push_config(const char *var, const char *value)
 945{
 946        if (!strcmp(var, "push.default")) {
 947                if (!value)
 948                        return config_error_nonbool(var);
 949                else if (!strcmp(value, "nothing"))
 950                        push_default = PUSH_DEFAULT_NOTHING;
 951                else if (!strcmp(value, "matching"))
 952                        push_default = PUSH_DEFAULT_MATCHING;
 953                else if (!strcmp(value, "simple"))
 954                        push_default = PUSH_DEFAULT_SIMPLE;
 955                else if (!strcmp(value, "upstream"))
 956                        push_default = PUSH_DEFAULT_UPSTREAM;
 957                else if (!strcmp(value, "tracking")) /* deprecated */
 958                        push_default = PUSH_DEFAULT_UPSTREAM;
 959                else if (!strcmp(value, "current"))
 960                        push_default = PUSH_DEFAULT_CURRENT;
 961                else {
 962                        error("Malformed value for %s: %s", var, value);
 963                        return error("Must be one of nothing, matching, simple, "
 964                                     "upstream or current.");
 965                }
 966                return 0;
 967        }
 968
 969        /* Add other config variables here and to Documentation/config.txt. */
 970        return 0;
 971}
 972
 973static int git_default_mailmap_config(const char *var, const char *value)
 974{
 975        if (!strcmp(var, "mailmap.file"))
 976                return git_config_pathname(&git_mailmap_file, var, value);
 977        if (!strcmp(var, "mailmap.blob"))
 978                return git_config_string(&git_mailmap_blob, var, value);
 979
 980        /* Add other config variables here and to Documentation/config.txt. */
 981        return 0;
 982}
 983
 984int git_default_config(const char *var, const char *value, void *dummy)
 985{
 986        if (starts_with(var, "core."))
 987                return git_default_core_config(var, value);
 988
 989        if (starts_with(var, "user."))
 990                return git_ident_config(var, value, dummy);
 991
 992        if (starts_with(var, "i18n."))
 993                return git_default_i18n_config(var, value);
 994
 995        if (starts_with(var, "branch."))
 996                return git_default_branch_config(var, value);
 997
 998        if (starts_with(var, "push."))
 999                return git_default_push_config(var, value);
1000
1001        if (starts_with(var, "mailmap."))
1002                return git_default_mailmap_config(var, value);
1003
1004        if (starts_with(var, "advice."))
1005                return git_default_advice_config(var, value);
1006
1007        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
1008                pager_use_color = git_config_bool(var,value);
1009                return 0;
1010        }
1011
1012        if (!strcmp(var, "pack.packsizelimit")) {
1013                pack_size_limit_cfg = git_config_ulong(var, value);
1014                return 0;
1015        }
1016        /* Add other config variables here and to Documentation/config.txt. */
1017        return 0;
1018}
1019
1020/*
1021 * All source specific fields in the union, die_on_error, name and the callbacks
1022 * fgetc, ungetc, ftell of top need to be initialized before calling
1023 * this function.
1024 */
1025static int do_config_from(struct config_source *top, config_fn_t fn, void *data)
1026{
1027        int ret;
1028
1029        /* push config-file parsing state stack */
1030        top->prev = cf;
1031        top->linenr = 1;
1032        top->eof = 0;
1033        strbuf_init(&top->value, 1024);
1034        strbuf_init(&top->var, 1024);
1035        cf = top;
1036
1037        ret = git_parse_source(fn, data);
1038
1039        /* pop config-file parsing state stack */
1040        strbuf_release(&top->value);
1041        strbuf_release(&top->var);
1042        cf = top->prev;
1043
1044        return ret;
1045}
1046
1047static int do_config_from_file(config_fn_t fn,
1048                const char *name, const char *path, FILE *f, void *data)
1049{
1050        struct config_source top;
1051
1052        top.u.file = f;
1053        top.name = name;
1054        top.path = path;
1055        top.die_on_error = 1;
1056        top.do_fgetc = config_file_fgetc;
1057        top.do_ungetc = config_file_ungetc;
1058        top.do_ftell = config_file_ftell;
1059
1060        return do_config_from(&top, fn, data);
1061}
1062
1063static int git_config_from_stdin(config_fn_t fn, void *data)
1064{
1065        return do_config_from_file(fn, "<stdin>", NULL, stdin, data);
1066}
1067
1068int git_config_from_file(config_fn_t fn, const char *filename, void *data)
1069{
1070        int ret = -1;
1071        FILE *f;
1072
1073        f = fopen(filename, "r");
1074        if (f) {
1075                ret = do_config_from_file(fn, filename, filename, f, data);
1076                fclose(f);
1077        }
1078        return ret;
1079}
1080
1081int git_config_from_buf(config_fn_t fn, const char *name, const char *buf,
1082                        size_t len, void *data)
1083{
1084        struct config_source top;
1085
1086        top.u.buf.buf = buf;
1087        top.u.buf.len = len;
1088        top.u.buf.pos = 0;
1089        top.name = name;
1090        top.path = NULL;
1091        top.die_on_error = 0;
1092        top.do_fgetc = config_buf_fgetc;
1093        top.do_ungetc = config_buf_ungetc;
1094        top.do_ftell = config_buf_ftell;
1095
1096        return do_config_from(&top, fn, data);
1097}
1098
1099static int git_config_from_blob_sha1(config_fn_t fn,
1100                                     const char *name,
1101                                     const unsigned char *sha1,
1102                                     void *data)
1103{
1104        enum object_type type;
1105        char *buf;
1106        unsigned long size;
1107        int ret;
1108
1109        buf = read_sha1_file(sha1, &type, &size);
1110        if (!buf)
1111                return error("unable to load config blob object '%s'", name);
1112        if (type != OBJ_BLOB) {
1113                free(buf);
1114                return error("reference '%s' does not point to a blob", name);
1115        }
1116
1117        ret = git_config_from_buf(fn, name, buf, size, data);
1118        free(buf);
1119
1120        return ret;
1121}
1122
1123static int git_config_from_blob_ref(config_fn_t fn,
1124                                    const char *name,
1125                                    void *data)
1126{
1127        unsigned char sha1[20];
1128
1129        if (get_sha1(name, sha1) < 0)
1130                return error("unable to resolve config blob '%s'", name);
1131        return git_config_from_blob_sha1(fn, name, sha1, data);
1132}
1133
1134const char *git_etc_gitconfig(void)
1135{
1136        static const char *system_wide;
1137        if (!system_wide)
1138                system_wide = system_path(ETC_GITCONFIG);
1139        return system_wide;
1140}
1141
1142int git_env_bool(const char *k, int def)
1143{
1144        const char *v = getenv(k);
1145        return v ? git_config_bool(k, v) : def;
1146}
1147
1148int git_config_system(void)
1149{
1150        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
1151}
1152
1153int git_config_early(config_fn_t fn, void *data, const char *repo_config)
1154{
1155        int ret = 0, found = 0;
1156        char *xdg_config = NULL;
1157        char *user_config = NULL;
1158
1159        home_config_paths(&user_config, &xdg_config, "config");
1160
1161        if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0)) {
1162                ret += git_config_from_file(fn, git_etc_gitconfig(),
1163                                            data);
1164                found += 1;
1165        }
1166
1167        if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK)) {
1168                ret += git_config_from_file(fn, xdg_config, data);
1169                found += 1;
1170        }
1171
1172        if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK)) {
1173                ret += git_config_from_file(fn, user_config, data);
1174                found += 1;
1175        }
1176
1177        if (repo_config && !access_or_die(repo_config, R_OK, 0)) {
1178                ret += git_config_from_file(fn, repo_config, data);
1179                found += 1;
1180        }
1181
1182        switch (git_config_from_parameters(fn, data)) {
1183        case -1: /* error */
1184                die(_("unable to parse command-line config"));
1185                break;
1186        case 0: /* found nothing */
1187                break;
1188        default: /* found at least one item */
1189                found++;
1190                break;
1191        }
1192
1193        free(xdg_config);
1194        free(user_config);
1195        return ret == 0 ? found : ret;
1196}
1197
1198int git_config_with_options(config_fn_t fn, void *data,
1199                            struct git_config_source *config_source,
1200                            int respect_includes)
1201{
1202        char *repo_config = NULL;
1203        int ret;
1204        struct config_include_data inc = CONFIG_INCLUDE_INIT;
1205
1206        if (respect_includes) {
1207                inc.fn = fn;
1208                inc.data = data;
1209                fn = git_config_include;
1210                data = &inc;
1211        }
1212
1213        /*
1214         * If we have a specific filename, use it. Otherwise, follow the
1215         * regular lookup sequence.
1216         */
1217        if (config_source && config_source->use_stdin)
1218                return git_config_from_stdin(fn, data);
1219        else if (config_source && config_source->file)
1220                return git_config_from_file(fn, config_source->file, data);
1221        else if (config_source && config_source->blob)
1222                return git_config_from_blob_ref(fn, config_source->blob, data);
1223
1224        repo_config = git_pathdup("config");
1225        ret = git_config_early(fn, data, repo_config);
1226        if (repo_config)
1227                free(repo_config);
1228        return ret;
1229}
1230
1231static void git_config_raw(config_fn_t fn, void *data)
1232{
1233        if (git_config_with_options(fn, data, NULL, 1) < 0)
1234                /*
1235                 * git_config_with_options() normally returns only
1236                 * positive values, as most errors are fatal, and
1237                 * non-fatal potential errors are guarded by "if"
1238                 * statements that are entered only when no error is
1239                 * possible.
1240                 *
1241                 * If we ever encounter a non-fatal error, it means
1242                 * something went really wrong and we should stop
1243                 * immediately.
1244                 */
1245                die(_("unknown error occured while reading the configuration files"));
1246}
1247
1248static void configset_iter(struct config_set *cs, config_fn_t fn, void *data)
1249{
1250        int i, value_index;
1251        struct string_list *values;
1252        struct config_set_element *entry;
1253        struct configset_list *list = &cs->list;
1254        struct key_value_info *kv_info;
1255
1256        for (i = 0; i < list->nr; i++) {
1257                entry = list->items[i].e;
1258                value_index = list->items[i].value_index;
1259                values = &entry->value_list;
1260                if (fn(entry->key, values->items[value_index].string, data) < 0) {
1261                        kv_info = values->items[value_index].util;
1262                        git_die_config_linenr(entry->key, kv_info->filename, kv_info->linenr);
1263                }
1264        }
1265}
1266
1267static void git_config_check_init(void);
1268
1269void git_config(config_fn_t fn, void *data)
1270{
1271        git_config_check_init();
1272        configset_iter(&the_config_set, fn, data);
1273}
1274
1275static struct config_set_element *configset_find_element(struct config_set *cs, const char *key)
1276{
1277        struct config_set_element k;
1278        struct config_set_element *found_entry;
1279        char *normalized_key;
1280        int ret;
1281        /*
1282         * `key` may come from the user, so normalize it before using it
1283         * for querying entries from the hashmap.
1284         */
1285        ret = git_config_parse_key(key, &normalized_key, NULL);
1286
1287        if (ret)
1288                return NULL;
1289
1290        hashmap_entry_init(&k, strhash(normalized_key));
1291        k.key = normalized_key;
1292        found_entry = hashmap_get(&cs->config_hash, &k, NULL);
1293        free(normalized_key);
1294        return found_entry;
1295}
1296
1297static int configset_add_value(struct config_set *cs, const char *key, const char *value)
1298{
1299        struct config_set_element *e;
1300        struct string_list_item *si;
1301        struct configset_list_item *l_item;
1302        struct key_value_info *kv_info = xmalloc(sizeof(*kv_info));
1303
1304        e = configset_find_element(cs, key);
1305        /*
1306         * Since the keys are being fed by git_config*() callback mechanism, they
1307         * are already normalized. So simply add them without any further munging.
1308         */
1309        if (!e) {
1310                e = xmalloc(sizeof(*e));
1311                hashmap_entry_init(e, strhash(key));
1312                e->key = xstrdup(key);
1313                string_list_init(&e->value_list, 1);
1314                hashmap_add(&cs->config_hash, e);
1315        }
1316        si = string_list_append_nodup(&e->value_list, value ? xstrdup(value) : NULL);
1317
1318        ALLOC_GROW(cs->list.items, cs->list.nr + 1, cs->list.alloc);
1319        l_item = &cs->list.items[cs->list.nr++];
1320        l_item->e = e;
1321        l_item->value_index = e->value_list.nr - 1;
1322
1323        if (cf) {
1324                kv_info->filename = strintern(cf->name);
1325                kv_info->linenr = cf->linenr;
1326        } else {
1327                /* for values read from `git_config_from_parameters()` */
1328                kv_info->filename = NULL;
1329                kv_info->linenr = -1;
1330        }
1331        si->util = kv_info;
1332
1333        return 0;
1334}
1335
1336static int config_set_element_cmp(const struct config_set_element *e1,
1337                                 const struct config_set_element *e2, const void *unused)
1338{
1339        return strcmp(e1->key, e2->key);
1340}
1341
1342void git_configset_init(struct config_set *cs)
1343{
1344        hashmap_init(&cs->config_hash, (hashmap_cmp_fn)config_set_element_cmp, 0);
1345        cs->hash_initialized = 1;
1346        cs->list.nr = 0;
1347        cs->list.alloc = 0;
1348        cs->list.items = NULL;
1349}
1350
1351void git_configset_clear(struct config_set *cs)
1352{
1353        struct config_set_element *entry;
1354        struct hashmap_iter iter;
1355        if (!cs->hash_initialized)
1356                return;
1357
1358        hashmap_iter_init(&cs->config_hash, &iter);
1359        while ((entry = hashmap_iter_next(&iter))) {
1360                free(entry->key);
1361                string_list_clear(&entry->value_list, 1);
1362        }
1363        hashmap_free(&cs->config_hash, 1);
1364        cs->hash_initialized = 0;
1365        free(cs->list.items);
1366        cs->list.nr = 0;
1367        cs->list.alloc = 0;
1368        cs->list.items = NULL;
1369}
1370
1371static int config_set_callback(const char *key, const char *value, void *cb)
1372{
1373        struct config_set *cs = cb;
1374        configset_add_value(cs, key, value);
1375        return 0;
1376}
1377
1378int git_configset_add_file(struct config_set *cs, const char *filename)
1379{
1380        return git_config_from_file(config_set_callback, filename, cs);
1381}
1382
1383int git_configset_get_value(struct config_set *cs, const char *key, const char **value)
1384{
1385        const struct string_list *values = NULL;
1386        /*
1387         * Follows "last one wins" semantic, i.e., if there are multiple matches for the
1388         * queried key in the files of the configset, the value returned will be the last
1389         * value in the value list for that key.
1390         */
1391        values = git_configset_get_value_multi(cs, key);
1392
1393        if (!values)
1394                return 1;
1395        assert(values->nr > 0);
1396        *value = values->items[values->nr - 1].string;
1397        return 0;
1398}
1399
1400const struct string_list *git_configset_get_value_multi(struct config_set *cs, const char *key)
1401{
1402        struct config_set_element *e = configset_find_element(cs, key);
1403        return e ? &e->value_list : NULL;
1404}
1405
1406int git_configset_get_string_const(struct config_set *cs, const char *key, const char **dest)
1407{
1408        const char *value;
1409        if (!git_configset_get_value(cs, key, &value))
1410                return git_config_string(dest, key, value);
1411        else
1412                return 1;
1413}
1414
1415int git_configset_get_string(struct config_set *cs, const char *key, char **dest)
1416{
1417        return git_configset_get_string_const(cs, key, (const char **)dest);
1418}
1419
1420int git_configset_get_int(struct config_set *cs, const char *key, int *dest)
1421{
1422        const char *value;
1423        if (!git_configset_get_value(cs, key, &value)) {
1424                *dest = git_config_int(key, value);
1425                return 0;
1426        } else
1427                return 1;
1428}
1429
1430int git_configset_get_ulong(struct config_set *cs, const char *key, unsigned long *dest)
1431{
1432        const char *value;
1433        if (!git_configset_get_value(cs, key, &value)) {
1434                *dest = git_config_ulong(key, value);
1435                return 0;
1436        } else
1437                return 1;
1438}
1439
1440int git_configset_get_bool(struct config_set *cs, const char *key, int *dest)
1441{
1442        const char *value;
1443        if (!git_configset_get_value(cs, key, &value)) {
1444                *dest = git_config_bool(key, value);
1445                return 0;
1446        } else
1447                return 1;
1448}
1449
1450int git_configset_get_bool_or_int(struct config_set *cs, const char *key,
1451                                int *is_bool, int *dest)
1452{
1453        const char *value;
1454        if (!git_configset_get_value(cs, key, &value)) {
1455                *dest = git_config_bool_or_int(key, value, is_bool);
1456                return 0;
1457        } else
1458                return 1;
1459}
1460
1461int git_configset_get_maybe_bool(struct config_set *cs, const char *key, int *dest)
1462{
1463        const char *value;
1464        if (!git_configset_get_value(cs, key, &value)) {
1465                *dest = git_config_maybe_bool(key, value);
1466                if (*dest == -1)
1467                        return -1;
1468                return 0;
1469        } else
1470                return 1;
1471}
1472
1473int git_configset_get_pathname(struct config_set *cs, const char *key, const char **dest)
1474{
1475        const char *value;
1476        if (!git_configset_get_value(cs, key, &value))
1477                return git_config_pathname(dest, key, value);
1478        else
1479                return 1;
1480}
1481
1482static void git_config_check_init(void)
1483{
1484        if (the_config_set.hash_initialized)
1485                return;
1486        git_configset_init(&the_config_set);
1487        git_config_raw(config_set_callback, &the_config_set);
1488}
1489
1490void git_config_clear(void)
1491{
1492        if (!the_config_set.hash_initialized)
1493                return;
1494        git_configset_clear(&the_config_set);
1495}
1496
1497int git_config_get_value(const char *key, const char **value)
1498{
1499        git_config_check_init();
1500        return git_configset_get_value(&the_config_set, key, value);
1501}
1502
1503const struct string_list *git_config_get_value_multi(const char *key)
1504{
1505        git_config_check_init();
1506        return git_configset_get_value_multi(&the_config_set, key);
1507}
1508
1509int git_config_get_string_const(const char *key, const char **dest)
1510{
1511        int ret;
1512        git_config_check_init();
1513        ret = git_configset_get_string_const(&the_config_set, key, dest);
1514        if (ret < 0)
1515                git_die_config(key, NULL);
1516        return ret;
1517}
1518
1519int git_config_get_string(const char *key, char **dest)
1520{
1521        git_config_check_init();
1522        return git_config_get_string_const(key, (const char **)dest);
1523}
1524
1525int git_config_get_int(const char *key, int *dest)
1526{
1527        git_config_check_init();
1528        return git_configset_get_int(&the_config_set, key, dest);
1529}
1530
1531int git_config_get_ulong(const char *key, unsigned long *dest)
1532{
1533        git_config_check_init();
1534        return git_configset_get_ulong(&the_config_set, key, dest);
1535}
1536
1537int git_config_get_bool(const char *key, int *dest)
1538{
1539        git_config_check_init();
1540        return git_configset_get_bool(&the_config_set, key, dest);
1541}
1542
1543int git_config_get_bool_or_int(const char *key, int *is_bool, int *dest)
1544{
1545        git_config_check_init();
1546        return git_configset_get_bool_or_int(&the_config_set, key, is_bool, dest);
1547}
1548
1549int git_config_get_maybe_bool(const char *key, int *dest)
1550{
1551        git_config_check_init();
1552        return git_configset_get_maybe_bool(&the_config_set, key, dest);
1553}
1554
1555int git_config_get_pathname(const char *key, const char **dest)
1556{
1557        int ret;
1558        git_config_check_init();
1559        ret = git_configset_get_pathname(&the_config_set, key, dest);
1560        if (ret < 0)
1561                git_die_config(key, NULL);
1562        return ret;
1563}
1564
1565NORETURN
1566void git_die_config_linenr(const char *key, const char *filename, int linenr)
1567{
1568        if (!filename)
1569                die(_("unable to parse '%s' from command-line config"), key);
1570        else
1571                die(_("bad config variable '%s' in file '%s' at line %d"),
1572                    key, filename, linenr);
1573}
1574
1575NORETURN __attribute__((format(printf, 2, 3)))
1576void git_die_config(const char *key, const char *err, ...)
1577{
1578        const struct string_list *values;
1579        struct key_value_info *kv_info;
1580
1581        if (err) {
1582                va_list params;
1583                va_start(params, err);
1584                vreportf("error: ", err, params);
1585                va_end(params);
1586        }
1587        values = git_config_get_value_multi(key);
1588        kv_info = values->items[values->nr - 1].util;
1589        git_die_config_linenr(key, kv_info->filename, kv_info->linenr);
1590}
1591
1592/*
1593 * Find all the stuff for git_config_set() below.
1594 */
1595
1596static struct {
1597        int baselen;
1598        char *key;
1599        int do_not_match;
1600        regex_t *value_regex;
1601        int multi_replace;
1602        size_t *offset;
1603        unsigned int offset_alloc;
1604        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1605        int seen;
1606} store;
1607
1608static int matches(const char *key, const char *value)
1609{
1610        if (strcmp(key, store.key))
1611                return 0; /* not ours */
1612        if (!store.value_regex)
1613                return 1; /* always matches */
1614        if (store.value_regex == CONFIG_REGEX_NONE)
1615                return 0; /* never matches */
1616
1617        return store.do_not_match ^
1618                (value && !regexec(store.value_regex, value, 0, NULL, 0));
1619}
1620
1621static int store_aux(const char *key, const char *value, void *cb)
1622{
1623        const char *ep;
1624        size_t section_len;
1625
1626        switch (store.state) {
1627        case KEY_SEEN:
1628                if (matches(key, value)) {
1629                        if (store.seen == 1 && store.multi_replace == 0) {
1630                                warning(_("%s has multiple values"), key);
1631                        }
1632
1633                        ALLOC_GROW(store.offset, store.seen + 1,
1634                                   store.offset_alloc);
1635
1636                        store.offset[store.seen] = cf->do_ftell(cf);
1637                        store.seen++;
1638                }
1639                break;
1640        case SECTION_SEEN:
1641                /*
1642                 * What we are looking for is in store.key (both
1643                 * section and var), and its section part is baselen
1644                 * long.  We found key (again, both section and var).
1645                 * We would want to know if this key is in the same
1646                 * section as what we are looking for.  We already
1647                 * know we are in the same section as what should
1648                 * hold store.key.
1649                 */
1650                ep = strrchr(key, '.');
1651                section_len = ep - key;
1652
1653                if ((section_len != store.baselen) ||
1654                    memcmp(key, store.key, section_len+1)) {
1655                        store.state = SECTION_END_SEEN;
1656                        break;
1657                }
1658
1659                /*
1660                 * Do not increment matches: this is no match, but we
1661                 * just made sure we are in the desired section.
1662                 */
1663                ALLOC_GROW(store.offset, store.seen + 1,
1664                           store.offset_alloc);
1665                store.offset[store.seen] = cf->do_ftell(cf);
1666                /* fallthru */
1667        case SECTION_END_SEEN:
1668        case START:
1669                if (matches(key, value)) {
1670                        ALLOC_GROW(store.offset, store.seen + 1,
1671                                   store.offset_alloc);
1672                        store.offset[store.seen] = cf->do_ftell(cf);
1673                        store.state = KEY_SEEN;
1674                        store.seen++;
1675                } else {
1676                        if (strrchr(key, '.') - key == store.baselen &&
1677                              !strncmp(key, store.key, store.baselen)) {
1678                                        store.state = SECTION_SEEN;
1679                                        ALLOC_GROW(store.offset,
1680                                                   store.seen + 1,
1681                                                   store.offset_alloc);
1682                                        store.offset[store.seen] = cf->do_ftell(cf);
1683                        }
1684                }
1685        }
1686        return 0;
1687}
1688
1689static int write_error(const char *filename)
1690{
1691        error("failed to write new configuration file %s", filename);
1692
1693        /* Same error code as "failed to rename". */
1694        return 4;
1695}
1696
1697static int store_write_section(int fd, const char *key)
1698{
1699        const char *dot;
1700        int i, success;
1701        struct strbuf sb = STRBUF_INIT;
1702
1703        dot = memchr(key, '.', store.baselen);
1704        if (dot) {
1705                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1706                for (i = dot - key + 1; i < store.baselen; i++) {
1707                        if (key[i] == '"' || key[i] == '\\')
1708                                strbuf_addch(&sb, '\\');
1709                        strbuf_addch(&sb, key[i]);
1710                }
1711                strbuf_addstr(&sb, "\"]\n");
1712        } else {
1713                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1714        }
1715
1716        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1717        strbuf_release(&sb);
1718
1719        return success;
1720}
1721
1722static int store_write_pair(int fd, const char *key, const char *value)
1723{
1724        int i, success;
1725        int length = strlen(key + store.baselen + 1);
1726        const char *quote = "";
1727        struct strbuf sb = STRBUF_INIT;
1728
1729        /*
1730         * Check to see if the value needs to be surrounded with a dq pair.
1731         * Note that problematic characters are always backslash-quoted; this
1732         * check is about not losing leading or trailing SP and strings that
1733         * follow beginning-of-comment characters (i.e. ';' and '#') by the
1734         * configuration parser.
1735         */
1736        if (value[0] == ' ')
1737                quote = "\"";
1738        for (i = 0; value[i]; i++)
1739                if (value[i] == ';' || value[i] == '#')
1740                        quote = "\"";
1741        if (i && value[i - 1] == ' ')
1742                quote = "\"";
1743
1744        strbuf_addf(&sb, "\t%.*s = %s",
1745                    length, key + store.baselen + 1, quote);
1746
1747        for (i = 0; value[i]; i++)
1748                switch (value[i]) {
1749                case '\n':
1750                        strbuf_addstr(&sb, "\\n");
1751                        break;
1752                case '\t':
1753                        strbuf_addstr(&sb, "\\t");
1754                        break;
1755                case '"':
1756                case '\\':
1757                        strbuf_addch(&sb, '\\');
1758                default:
1759                        strbuf_addch(&sb, value[i]);
1760                        break;
1761                }
1762        strbuf_addf(&sb, "%s\n", quote);
1763
1764        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1765        strbuf_release(&sb);
1766
1767        return success;
1768}
1769
1770static ssize_t find_beginning_of_line(const char *contents, size_t size,
1771        size_t offset_, int *found_bracket)
1772{
1773        size_t equal_offset = size, bracket_offset = size;
1774        ssize_t offset;
1775
1776contline:
1777        for (offset = offset_-2; offset > 0
1778                        && contents[offset] != '\n'; offset--)
1779                switch (contents[offset]) {
1780                        case '=': equal_offset = offset; break;
1781                        case ']': bracket_offset = offset; break;
1782                }
1783        if (offset > 0 && contents[offset-1] == '\\') {
1784                offset_ = offset;
1785                goto contline;
1786        }
1787        if (bracket_offset < equal_offset) {
1788                *found_bracket = 1;
1789                offset = bracket_offset+1;
1790        } else
1791                offset++;
1792
1793        return offset;
1794}
1795
1796int git_config_set_in_file(const char *config_filename,
1797                        const char *key, const char *value)
1798{
1799        return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1800}
1801
1802int git_config_set(const char *key, const char *value)
1803{
1804        return git_config_set_multivar(key, value, NULL, 0);
1805}
1806
1807/*
1808 * Auxiliary function to sanity-check and split the key into the section
1809 * identifier and variable name.
1810 *
1811 * Returns 0 on success, -1 when there is an invalid character in the key and
1812 * -2 if there is no section name in the key.
1813 *
1814 * store_key - pointer to char* which will hold a copy of the key with
1815 *             lowercase section and variable name
1816 * baselen - pointer to int which will hold the length of the
1817 *           section + subsection part, can be NULL
1818 */
1819int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1820{
1821        int i, dot, baselen;
1822        const char *last_dot = strrchr(key, '.');
1823
1824        /*
1825         * Since "key" actually contains the section name and the real
1826         * key name separated by a dot, we have to know where the dot is.
1827         */
1828
1829        if (last_dot == NULL || last_dot == key) {
1830                error("key does not contain a section: %s", key);
1831                return -CONFIG_NO_SECTION_OR_NAME;
1832        }
1833
1834        if (!last_dot[1]) {
1835                error("key does not contain variable name: %s", key);
1836                return -CONFIG_NO_SECTION_OR_NAME;
1837        }
1838
1839        baselen = last_dot - key;
1840        if (baselen_)
1841                *baselen_ = baselen;
1842
1843        /*
1844         * Validate the key and while at it, lower case it for matching.
1845         */
1846        *store_key = xmalloc(strlen(key) + 1);
1847
1848        dot = 0;
1849        for (i = 0; key[i]; i++) {
1850                unsigned char c = key[i];
1851                if (c == '.')
1852                        dot = 1;
1853                /* Leave the extended basename untouched.. */
1854                if (!dot || i > baselen) {
1855                        if (!iskeychar(c) ||
1856                            (i == baselen + 1 && !isalpha(c))) {
1857                                error("invalid key: %s", key);
1858                                goto out_free_ret_1;
1859                        }
1860                        c = tolower(c);
1861                } else if (c == '\n') {
1862                        error("invalid key (newline): %s", key);
1863                        goto out_free_ret_1;
1864                }
1865                (*store_key)[i] = c;
1866        }
1867        (*store_key)[i] = 0;
1868
1869        return 0;
1870
1871out_free_ret_1:
1872        free(*store_key);
1873        *store_key = NULL;
1874        return -CONFIG_INVALID_KEY;
1875}
1876
1877/*
1878 * If value==NULL, unset in (remove from) config,
1879 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1880 * if value_regex==CONFIG_REGEX_NONE, do not match any existing values
1881 *     (only add a new one)
1882 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1883 *     else all matching key/values (regardless how many) are removed,
1884 *     before the new pair is written.
1885 *
1886 * Returns 0 on success.
1887 *
1888 * This function does this:
1889 *
1890 * - it locks the config file by creating ".git/config.lock"
1891 *
1892 * - it then parses the config using store_aux() as validator to find
1893 *   the position on the key/value pair to replace. If it is to be unset,
1894 *   it must be found exactly once.
1895 *
1896 * - the config file is mmap()ed and the part before the match (if any) is
1897 *   written to the lock file, then the changed part and the rest.
1898 *
1899 * - the config file is removed and the lock file rename()d to it.
1900 *
1901 */
1902int git_config_set_multivar_in_file(const char *config_filename,
1903                                const char *key, const char *value,
1904                                const char *value_regex, int multi_replace)
1905{
1906        int fd = -1, in_fd;
1907        int ret;
1908        struct lock_file *lock = NULL;
1909        char *filename_buf = NULL;
1910
1911        /* parse-key returns negative; flip the sign to feed exit(3) */
1912        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1913        if (ret)
1914                goto out_free;
1915
1916        store.multi_replace = multi_replace;
1917
1918        if (!config_filename)
1919                config_filename = filename_buf = git_pathdup("config");
1920
1921        /*
1922         * The lock serves a purpose in addition to locking: the new
1923         * contents of .git/config will be written into it.
1924         */
1925        lock = xcalloc(1, sizeof(struct lock_file));
1926        fd = hold_lock_file_for_update(lock, config_filename, 0);
1927        if (fd < 0) {
1928                error("could not lock config file %s: %s", config_filename, strerror(errno));
1929                free(store.key);
1930                ret = CONFIG_NO_LOCK;
1931                goto out_free;
1932        }
1933
1934        /*
1935         * If .git/config does not exist yet, write a minimal version.
1936         */
1937        in_fd = open(config_filename, O_RDONLY);
1938        if ( in_fd < 0 ) {
1939                free(store.key);
1940
1941                if ( ENOENT != errno ) {
1942                        error("opening %s: %s", config_filename,
1943                              strerror(errno));
1944                        ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1945                        goto out_free;
1946                }
1947                /* if nothing to unset, error out */
1948                if (value == NULL) {
1949                        ret = CONFIG_NOTHING_SET;
1950                        goto out_free;
1951                }
1952
1953                store.key = (char *)key;
1954                if (!store_write_section(fd, key) ||
1955                    !store_write_pair(fd, key, value))
1956                        goto write_err_out;
1957        } else {
1958                struct stat st;
1959                char *contents;
1960                size_t contents_sz, copy_begin, copy_end;
1961                int i, new_line = 0;
1962
1963                if (value_regex == NULL)
1964                        store.value_regex = NULL;
1965                else if (value_regex == CONFIG_REGEX_NONE)
1966                        store.value_regex = CONFIG_REGEX_NONE;
1967                else {
1968                        if (value_regex[0] == '!') {
1969                                store.do_not_match = 1;
1970                                value_regex++;
1971                        } else
1972                                store.do_not_match = 0;
1973
1974                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1975                        if (regcomp(store.value_regex, value_regex,
1976                                        REG_EXTENDED)) {
1977                                error("invalid pattern: %s", value_regex);
1978                                free(store.value_regex);
1979                                ret = CONFIG_INVALID_PATTERN;
1980                                goto out_free;
1981                        }
1982                }
1983
1984                ALLOC_GROW(store.offset, 1, store.offset_alloc);
1985                store.offset[0] = 0;
1986                store.state = START;
1987                store.seen = 0;
1988
1989                /*
1990                 * After this, store.offset will contain the *end* offset
1991                 * of the last match, or remain at 0 if no match was found.
1992                 * As a side effect, we make sure to transform only a valid
1993                 * existing config file.
1994                 */
1995                if (git_config_from_file(store_aux, config_filename, NULL)) {
1996                        error("invalid config file %s", config_filename);
1997                        free(store.key);
1998                        if (store.value_regex != NULL &&
1999                            store.value_regex != CONFIG_REGEX_NONE) {
2000                                regfree(store.value_regex);
2001                                free(store.value_regex);
2002                        }
2003                        ret = CONFIG_INVALID_FILE;
2004                        goto out_free;
2005                }
2006
2007                free(store.key);
2008                if (store.value_regex != NULL &&
2009                    store.value_regex != CONFIG_REGEX_NONE) {
2010                        regfree(store.value_regex);
2011                        free(store.value_regex);
2012                }
2013
2014                /* if nothing to unset, or too many matches, error out */
2015                if ((store.seen == 0 && value == NULL) ||
2016                                (store.seen > 1 && multi_replace == 0)) {
2017                        ret = CONFIG_NOTHING_SET;
2018                        goto out_free;
2019                }
2020
2021                fstat(in_fd, &st);
2022                contents_sz = xsize_t(st.st_size);
2023                contents = xmmap(NULL, contents_sz, PROT_READ,
2024                        MAP_PRIVATE, in_fd, 0);
2025                close(in_fd);
2026
2027                if (chmod(lock->filename, st.st_mode & 07777) < 0) {
2028                        error("chmod on %s failed: %s",
2029                                lock->filename, strerror(errno));
2030                        ret = CONFIG_NO_WRITE;
2031                        goto out_free;
2032                }
2033
2034                if (store.seen == 0)
2035                        store.seen = 1;
2036
2037                for (i = 0, copy_begin = 0; i < store.seen; i++) {
2038                        if (store.offset[i] == 0) {
2039                                store.offset[i] = copy_end = contents_sz;
2040                        } else if (store.state != KEY_SEEN) {
2041                                copy_end = store.offset[i];
2042                        } else
2043                                copy_end = find_beginning_of_line(
2044                                        contents, contents_sz,
2045                                        store.offset[i]-2, &new_line);
2046
2047                        if (copy_end > 0 && contents[copy_end-1] != '\n')
2048                                new_line = 1;
2049
2050                        /* write the first part of the config */
2051                        if (copy_end > copy_begin) {
2052                                if (write_in_full(fd, contents + copy_begin,
2053                                                  copy_end - copy_begin) <
2054                                    copy_end - copy_begin)
2055                                        goto write_err_out;
2056                                if (new_line &&
2057                                    write_str_in_full(fd, "\n") != 1)
2058                                        goto write_err_out;
2059                        }
2060                        copy_begin = store.offset[i];
2061                }
2062
2063                /* write the pair (value == NULL means unset) */
2064                if (value != NULL) {
2065                        if (store.state == START) {
2066                                if (!store_write_section(fd, key))
2067                                        goto write_err_out;
2068                        }
2069                        if (!store_write_pair(fd, key, value))
2070                                goto write_err_out;
2071                }
2072
2073                /* write the rest of the config */
2074                if (copy_begin < contents_sz)
2075                        if (write_in_full(fd, contents + copy_begin,
2076                                          contents_sz - copy_begin) <
2077                            contents_sz - copy_begin)
2078                                goto write_err_out;
2079
2080                munmap(contents, contents_sz);
2081        }
2082
2083        if (commit_lock_file(lock) < 0) {
2084                error("could not commit config file %s", config_filename);
2085                ret = CONFIG_NO_WRITE;
2086                goto out_free;
2087        }
2088
2089        /*
2090         * lock is committed, so don't try to roll it back below.
2091         * NOTE: Since lockfile.c keeps a linked list of all created
2092         * lock_file structures, it isn't safe to free(lock).  It's
2093         * better to just leave it hanging around.
2094         */
2095        lock = NULL;
2096        ret = 0;
2097
2098        /* Invalidate the config cache */
2099        git_config_clear();
2100
2101out_free:
2102        if (lock)
2103                rollback_lock_file(lock);
2104        free(filename_buf);
2105        return ret;
2106
2107write_err_out:
2108        ret = write_error(lock->filename);
2109        goto out_free;
2110
2111}
2112
2113int git_config_set_multivar(const char *key, const char *value,
2114                        const char *value_regex, int multi_replace)
2115{
2116        return git_config_set_multivar_in_file(NULL, key, value, value_regex,
2117                                               multi_replace);
2118}
2119
2120static int section_name_match (const char *buf, const char *name)
2121{
2122        int i = 0, j = 0, dot = 0;
2123        if (buf[i] != '[')
2124                return 0;
2125        for (i = 1; buf[i] && buf[i] != ']'; i++) {
2126                if (!dot && isspace(buf[i])) {
2127                        dot = 1;
2128                        if (name[j++] != '.')
2129                                break;
2130                        for (i++; isspace(buf[i]); i++)
2131                                ; /* do nothing */
2132                        if (buf[i] != '"')
2133                                break;
2134                        continue;
2135                }
2136                if (buf[i] == '\\' && dot)
2137                        i++;
2138                else if (buf[i] == '"' && dot) {
2139                        for (i++; isspace(buf[i]); i++)
2140                                ; /* do_nothing */
2141                        break;
2142                }
2143                if (buf[i] != name[j++])
2144                        break;
2145        }
2146        if (buf[i] == ']' && name[j] == 0) {
2147                /*
2148                 * We match, now just find the right length offset by
2149                 * gobbling up any whitespace after it, as well
2150                 */
2151                i++;
2152                for (; buf[i] && isspace(buf[i]); i++)
2153                        ; /* do nothing */
2154                return i;
2155        }
2156        return 0;
2157}
2158
2159static int section_name_is_ok(const char *name)
2160{
2161        /* Empty section names are bogus. */
2162        if (!*name)
2163                return 0;
2164
2165        /*
2166         * Before a dot, we must be alphanumeric or dash. After the first dot,
2167         * anything goes, so we can stop checking.
2168         */
2169        for (; *name && *name != '.'; name++)
2170                if (*name != '-' && !isalnum(*name))
2171                        return 0;
2172        return 1;
2173}
2174
2175/* if new_name == NULL, the section is removed instead */
2176int git_config_rename_section_in_file(const char *config_filename,
2177                                      const char *old_name, const char *new_name)
2178{
2179        int ret = 0, remove = 0;
2180        char *filename_buf = NULL;
2181        struct lock_file *lock;
2182        int out_fd;
2183        char buf[1024];
2184        FILE *config_file;
2185        struct stat st;
2186
2187        if (new_name && !section_name_is_ok(new_name)) {
2188                ret = error("invalid section name: %s", new_name);
2189                goto out;
2190        }
2191
2192        if (!config_filename)
2193                config_filename = filename_buf = git_pathdup("config");
2194
2195        lock = xcalloc(1, sizeof(struct lock_file));
2196        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
2197        if (out_fd < 0) {
2198                ret = error("could not lock config file %s", config_filename);
2199                goto out;
2200        }
2201
2202        if (!(config_file = fopen(config_filename, "rb"))) {
2203                /* no config file means nothing to rename, no error */
2204                goto unlock_and_out;
2205        }
2206
2207        fstat(fileno(config_file), &st);
2208
2209        if (chmod(lock->filename, st.st_mode & 07777) < 0) {
2210                ret = error("chmod on %s failed: %s",
2211                                lock->filename, strerror(errno));
2212                goto out;
2213        }
2214
2215        while (fgets(buf, sizeof(buf), config_file)) {
2216                int i;
2217                int length;
2218                char *output = buf;
2219                for (i = 0; buf[i] && isspace(buf[i]); i++)
2220                        ; /* do nothing */
2221                if (buf[i] == '[') {
2222                        /* it's a section */
2223                        int offset = section_name_match(&buf[i], old_name);
2224                        if (offset > 0) {
2225                                ret++;
2226                                if (new_name == NULL) {
2227                                        remove = 1;
2228                                        continue;
2229                                }
2230                                store.baselen = strlen(new_name);
2231                                if (!store_write_section(out_fd, new_name)) {
2232                                        ret = write_error(lock->filename);
2233                                        goto out;
2234                                }
2235                                /*
2236                                 * We wrote out the new section, with
2237                                 * a newline, now skip the old
2238                                 * section's length
2239                                 */
2240                                output += offset + i;
2241                                if (strlen(output) > 0) {
2242                                        /*
2243                                         * More content means there's
2244                                         * a declaration to put on the
2245                                         * next line; indent with a
2246                                         * tab
2247                                         */
2248                                        output -= 1;
2249                                        output[0] = '\t';
2250                                }
2251                        }
2252                        remove = 0;
2253                }
2254                if (remove)
2255                        continue;
2256                length = strlen(output);
2257                if (write_in_full(out_fd, output, length) != length) {
2258                        ret = write_error(lock->filename);
2259                        goto out;
2260                }
2261        }
2262        fclose(config_file);
2263unlock_and_out:
2264        if (commit_lock_file(lock) < 0)
2265                ret = error("could not commit config file %s", config_filename);
2266out:
2267        free(filename_buf);
2268        return ret;
2269}
2270
2271int git_config_rename_section(const char *old_name, const char *new_name)
2272{
2273        return git_config_rename_section_in_file(NULL, old_name, new_name);
2274}
2275
2276/*
2277 * Call this to report error for your variable that should not
2278 * get a boolean value (i.e. "[my] var" means "true").
2279 */
2280#undef config_error_nonbool
2281int config_error_nonbool(const char *var)
2282{
2283        return error("Missing value for '%s'", var);
2284}
2285
2286int parse_config_key(const char *var,
2287                     const char *section,
2288                     const char **subsection, int *subsection_len,
2289                     const char **key)
2290{
2291        int section_len = strlen(section);
2292        const char *dot;
2293
2294        /* Does it start with "section." ? */
2295        if (!starts_with(var, section) || var[section_len] != '.')
2296                return -1;
2297
2298        /*
2299         * Find the key; we don't know yet if we have a subsection, but we must
2300         * parse backwards from the end, since the subsection may have dots in
2301         * it, too.
2302         */
2303        dot = strrchr(var, '.');
2304        *key = dot + 1;
2305
2306        /* Did we have a subsection at all? */
2307        if (dot == var + section_len) {
2308                *subsection = NULL;
2309                *subsection_len = 0;
2310        }
2311        else {
2312                *subsection = var + section_len + 1;
2313                *subsection_len = dot - *subsection;
2314        }
2315
2316        return 0;
2317}